diff options
Diffstat (limited to 'security/selinux/hooks.c')
| -rw-r--r-- | security/selinux/hooks.c | 5305 |
1 files changed, 3186 insertions, 2119 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index aff8f46c2aa..83d06db34d0 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4,26 +4,29 @@ * This file contains the SELinux hook function implementations. * * Authors: Stephen Smalley, <sds@epoch.ncsc.mil> - * Chris Vance, <cvance@nai.com> - * Wayne Salamon, <wsalamon@nai.com> - * James Morris <jmorris@redhat.com> + * Chris Vance, <cvance@nai.com> + * Wayne Salamon, <wsalamon@nai.com> + * James Morris <jmorris@redhat.com> * * Copyright (C) 2001,2002 Networks Associates Technology, Inc. - * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> + * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> + * Eric Paris <eparis@redhat.com> * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. - * <dgoeddel@trustedcs.com> - * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. - * Paul Moore, <paul.moore@hp.com> + * <dgoeddel@trustedcs.com> + * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P. + * Paul Moore <paul@paul-moore.com> + * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. + * Yuichi Nakamura <ynakam@hitachisoft.jp> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, - * as published by the Free Software Foundation. + * as published by the Free Software Foundation. */ -#include <linux/module.h> #include <linux/init.h> +#include <linux/kd.h> #include <linux/kernel.h> -#include <linux/ptrace.h> +#include <linux/tracehook.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/security.h> @@ -34,27 +37,32 @@ #include <linux/mman.h> #include <linux/slab.h> #include <linux/pagemap.h> +#include <linux/proc_fs.h> #include <linux/swap.h> #include <linux/spinlock.h> #include <linux/syscalls.h> +#include <linux/dcache.h> #include <linux/file.h> +#include <linux/fdtable.h> #include <linux/namei.h> #include <linux/mount.h> -#include <linux/ext2_fs.h> -#include <linux/proc_fs.h> -#include <linux/kd.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter_ipv6.h> #include <linux/tty.h> #include <net/icmp.h> -#include <net/ip.h> /* for sysctl_local_port_range[] */ +#include <net/ip.h> /* for local_port_range[] */ +#include <net/sock.h> #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ -#include <asm/uaccess.h> +#include <net/inet_connection_sock.h> +#include <net/net_namespace.h> +#include <net/netlabel.h> +#include <linux/uaccess.h> #include <asm/ioctls.h> +#include <linux/atomic.h> #include <linux/bitops.h> #include <linux/interrupt.h> #include <linux/netdevice.h> /* for network interface checks */ -#include <linux/netlink.h> +#include <net/netlink.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/dccp.h> @@ -66,31 +74,40 @@ #include <net/ipv6.h> #include <linux/hugetlb.h> #include <linux/personality.h> -#include <linux/sysctl.h> #include <linux/audit.h> #include <linux/string.h> #include <linux/selinux.h> #include <linux/mutex.h> +#include <linux/posix-timers.h> +#include <linux/syslog.h> +#include <linux/user_namespace.h> +#include <linux/export.h> +#include <linux/msg.h> +#include <linux/shm.h> #include "avc.h" #include "objsec.h" #include "netif.h" +#include "netnode.h" +#include "netport.h" #include "xfrm.h" #include "netlabel.h" +#include "audit.h" +#include "avc_ss.h" -#define XATTR_SELINUX_SUFFIX "selinux" -#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX +extern struct security_operations *security_ops; -extern unsigned int policydb_loaded_version; -extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); -extern int selinux_compat_net; +/* SECMARK reference count */ +static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); #ifdef CONFIG_SECURITY_SELINUX_DEVELOP -int selinux_enforcing = 0; +int selinux_enforcing; static int __init enforcing_setup(char *str) { - selinux_enforcing = simple_strtol(str,NULL,0); + unsigned long enforcing; + if (!kstrtoul(str, 0, &enforcing)) + selinux_enforcing = enforcing ? 1 : 0; return 1; } __setup("enforcing=", enforcing_setup); @@ -101,7 +118,9 @@ int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; static int __init selinux_enabled_setup(char *str) { - selinux_enabled = simple_strtol(str, NULL, 0); + unsigned long enabled; + if (!kstrtoul(str, 0, &enabled)) + selinux_enabled = enabled ? 1 : 0; return 1; } __setup("selinux=", selinux_enabled_setup); @@ -109,78 +128,97 @@ __setup("selinux=", selinux_enabled_setup); int selinux_enabled = 1; #endif -/* Original (dummy) security module. */ -static struct security_operations *original_ops = NULL; - -/* Minimal support for a secondary security module, - just to allow the use of the dummy or capability modules. - The owlsm module can alternatively be used as a secondary - module as long as CONFIG_OWLSM_FD is not enabled. */ -static struct security_operations *secondary_ops = NULL; - -/* Lists of inode and superblock security structures initialized - before the policy was loaded. */ -static LIST_HEAD(superblock_security_head); -static DEFINE_SPINLOCK(sb_security_lock); - static struct kmem_cache *sel_inode_cache; -/* Return security context for a given sid or just the context - length if the buffer is null or length is 0 */ -static int selinux_getsecurity(u32 sid, void *buffer, size_t size) +/** + * selinux_secmark_enabled - Check to see if SECMARK is currently enabled + * + * Description: + * This function checks the SECMARK reference counter to see if any SECMARK + * targets are currently configured, if the reference counter is greater than + * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is + * enabled, false (0) if SECMARK is disabled. If the always_check_network + * policy capability is enabled, SECMARK is always considered enabled. + * + */ +static int selinux_secmark_enabled(void) { - char *context; - unsigned len; - int rc; - - rc = security_sid_to_context(sid, &context, &len); - if (rc) - return rc; - - if (!buffer || !size) - goto getsecurity_exit; - - if (size < len) { - len = -ERANGE; - goto getsecurity_exit; - } - memcpy(buffer, context, len); - -getsecurity_exit: - kfree(context); - return len; + return (selinux_policycap_alwaysnetwork || atomic_read(&selinux_secmark_refcount)); } -/* Allocate and free functions for each kind of security blob. */ +/** + * selinux_peerlbl_enabled - Check to see if peer labeling is currently enabled + * + * Description: + * This function checks if NetLabel or labeled IPSEC is enabled. Returns true + * (1) if any are enabled or false (0) if neither are enabled. If the + * always_check_network policy capability is enabled, peer labeling + * is always considered enabled. + * + */ +static int selinux_peerlbl_enabled(void) +{ + return (selinux_policycap_alwaysnetwork || netlbl_enabled() || selinux_xfrm_enabled()); +} -static int task_alloc_security(struct task_struct *task) +/* + * initialise the security for the init task + */ +static void cred_init_security(void) { + struct cred *cred = (struct cred *) current->real_cred; struct task_security_struct *tsec; tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); if (!tsec) - return -ENOMEM; + panic("SELinux: Failed to initialize initial task.\n"); - tsec->task = task; - tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED; - task->security = tsec; + tsec->osid = tsec->sid = SECINITSID_KERNEL; + cred->security = tsec; +} - return 0; +/* + * get the security ID of a set of credentials + */ +static inline u32 cred_sid(const struct cred *cred) +{ + const struct task_security_struct *tsec; + + tsec = cred->security; + return tsec->sid; } -static void task_free_security(struct task_struct *task) +/* + * get the objective security ID of a task + */ +static inline u32 task_sid(const struct task_struct *task) { - struct task_security_struct *tsec = task->security; - task->security = NULL; - kfree(tsec); + u32 sid; + + rcu_read_lock(); + sid = cred_sid(__task_cred(task)); + rcu_read_unlock(); + return sid; } +/* + * get the subjective security ID of the current task + */ +static inline u32 current_sid(void) +{ + const struct task_security_struct *tsec = current_security(); + + return tsec->sid; +} + +/* Allocate and free functions for each kind of security blob. */ + static int inode_alloc_security(struct inode *inode) { - struct task_security_struct *tsec = current->security; struct inode_security_struct *isec; + u32 sid = current_sid(); - isec = kmem_cache_zalloc(sel_inode_cache, GFP_KERNEL); + isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); if (!isec) return -ENOMEM; @@ -189,12 +227,20 @@ static int inode_alloc_security(struct inode *inode) isec->inode = inode; isec->sid = SECINITSID_UNLABELED; isec->sclass = SECCLASS_FILE; - isec->task_sid = tsec->sid; + isec->task_sid = sid; inode->i_security = isec; return 0; } +static void inode_free_rcu(struct rcu_head *head) +{ + struct inode_security_struct *isec; + + isec = container_of(head, struct inode_security_struct, rcu); + kmem_cache_free(sel_inode_cache, isec); +} + static void inode_free_security(struct inode *inode) { struct inode_security_struct *isec = inode->i_security; @@ -205,22 +251,29 @@ static void inode_free_security(struct inode *inode) list_del_init(&isec->list); spin_unlock(&sbsec->isec_lock); - inode->i_security = NULL; - kmem_cache_free(sel_inode_cache, isec); + /* + * The inode may still be referenced in a path walk and + * a call to selinux_inode_permission() can be made + * after inode_free_security() is called. Ideally, the VFS + * wouldn't do this, but fixing that is a much harder + * job. For now, simply free the i_security via RCU, and + * leave the current inode->i_security pointer intact. + * The inode will be freed after the RCU grace period too. + */ + call_rcu(&isec->rcu, inode_free_rcu); } static int file_alloc_security(struct file *file) { - struct task_security_struct *tsec = current->security; struct file_security_struct *fsec; + u32 sid = current_sid(); fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); if (!fsec) return -ENOMEM; - fsec->file = file; - fsec->sid = tsec->sid; - fsec->fown_sid = tsec->sid; + fsec->sid = sid; + fsec->fown_sid = sid; file->f_security = fsec; return 0; @@ -242,7 +295,6 @@ static int superblock_alloc_security(struct super_block *sb) return -ENOMEM; mutex_init(&sbsec->lock); - INIT_LIST_HEAD(&sbsec->list); INIT_LIST_HEAD(&sbsec->isec_head); spin_lock_init(&sbsec->isec_lock); sbsec->sb = sb; @@ -257,55 +309,20 @@ static int superblock_alloc_security(struct super_block *sb) static void superblock_free_security(struct super_block *sb) { struct superblock_security_struct *sbsec = sb->s_security; - - spin_lock(&sb_security_lock); - if (!list_empty(&sbsec->list)) - list_del_init(&sbsec->list); - spin_unlock(&sb_security_lock); - sb->s_security = NULL; kfree(sbsec); } -static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) -{ - struct sk_security_struct *ssec; - - ssec = kzalloc(sizeof(*ssec), priority); - if (!ssec) - return -ENOMEM; - - ssec->sk = sk; - ssec->peer_sid = SECINITSID_UNLABELED; - ssec->sid = SECINITSID_UNLABELED; - sk->sk_security = ssec; - - selinux_netlbl_sk_security_init(ssec, family); - - return 0; -} - -static void sk_free_security(struct sock *sk) -{ - struct sk_security_struct *ssec = sk->sk_security; - - sk->sk_security = NULL; - kfree(ssec); -} - -/* The security server must be initialized before - any labeling or access decisions can be provided. */ -extern int ss_initialized; - /* The file system's label must be initialized prior to use. */ -static char *labeling_behaviors[6] = { +static const char *labeling_behaviors[7] = { "uses xattr", "uses transition SIDs", "uses task SIDs", "uses genfs_contexts", "not configured for labeling", "uses mountpoint labeling", + "uses native labeling", }; static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); @@ -316,25 +333,33 @@ static inline int inode_doinit(struct inode *inode) } enum { + Opt_error = -1, Opt_context = 1, Opt_fscontext = 2, - Opt_defcontext = 4, - Opt_rootcontext = 8, + Opt_defcontext = 3, + Opt_rootcontext = 4, + Opt_labelsupport = 5, + Opt_nextmntopt = 6, }; -static match_table_t tokens = { - {Opt_context, "context=%s"}, - {Opt_fscontext, "fscontext=%s"}, - {Opt_defcontext, "defcontext=%s"}, - {Opt_rootcontext, "rootcontext=%s"}, +#define NUM_SEL_MNT_OPTS (Opt_nextmntopt - 1) + +static const match_table_t tokens = { + {Opt_context, CONTEXT_STR "%s"}, + {Opt_fscontext, FSCONTEXT_STR "%s"}, + {Opt_defcontext, DEFCONTEXT_STR "%s"}, + {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, + {Opt_labelsupport, LABELSUPP_STR}, + {Opt_error, NULL}, }; #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" static int may_context_mount_sb_relabel(u32 sid, struct superblock_security_struct *sbsec, - struct task_security_struct *tsec) + const struct cred *cred) { + const struct task_security_struct *tsec = cred->security; int rc; rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, @@ -349,8 +374,9 @@ static int may_context_mount_sb_relabel(u32 sid, static int may_context_mount_inode_relabel(u32 sid, struct superblock_security_struct *sbsec, - struct task_security_struct *tsec) + const struct cred *cred) { + const struct task_security_struct *tsec = cred->security; int rc; rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, FILESYSTEM__RELABELFROM, NULL); @@ -362,150 +388,369 @@ static int may_context_mount_inode_relabel(u32 sid, return rc; } -static int try_context_mount(struct super_block *sb, void *data) +static int selinux_is_sblabel_mnt(struct super_block *sb) { - char *context = NULL, *defcontext = NULL; - char *fscontext = NULL, *rootcontext = NULL; - const char *name; - u32 sid; - int alloc = 0, rc = 0, seen = 0; - struct task_security_struct *tsec = current->security; struct superblock_security_struct *sbsec = sb->s_security; - if (!data) - goto out; + if (sbsec->behavior == SECURITY_FS_USE_XATTR || + sbsec->behavior == SECURITY_FS_USE_TRANS || + sbsec->behavior == SECURITY_FS_USE_TASK) + return 1; - name = sb->s_type->name; + /* Special handling for sysfs. Is genfs but also has setxattr handler*/ + if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0) + return 1; - if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) { + /* + * Special handling for rootfs. Is genfs but supports + * setting SELinux context on in-core inodes. + */ + if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0) + return 1; - /* NFS we understand. */ - if (!strcmp(name, "nfs")) { - struct nfs_mount_data *d = data; + return 0; +} - if (d->version < NFS_MOUNT_VERSION) - goto out; +static int sb_finish_set_opts(struct super_block *sb) +{ + struct superblock_security_struct *sbsec = sb->s_security; + struct dentry *root = sb->s_root; + struct inode *root_inode = root->d_inode; + int rc = 0; - if (d->context[0]) { - context = d->context; - seen |= Opt_context; - } - } else + if (sbsec->behavior == SECURITY_FS_USE_XATTR) { + /* Make sure that the xattr handler exists and that no + error other than -ENODATA is returned by getxattr on + the root directory. -ENODATA is ok, as this may be + the first boot of the SELinux kernel before we have + assigned xattr values to the filesystem. */ + if (!root_inode->i_op->getxattr) { + printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " + "xattr support\n", sb->s_id, sb->s_type->name); + rc = -EOPNOTSUPP; goto out; + } + rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); + if (rc < 0 && rc != -ENODATA) { + if (rc == -EOPNOTSUPP) + printk(KERN_WARNING "SELinux: (dev %s, type " + "%s) has no security xattr handler\n", + sb->s_id, sb->s_type->name); + else + printk(KERN_WARNING "SELinux: (dev %s, type " + "%s) getxattr errno %d\n", sb->s_id, + sb->s_type->name, -rc); + goto out; + } + } - } else { - /* Standard string-based options. */ - char *p, *options = data; + if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) + printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", + sb->s_id, sb->s_type->name); + else + printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", + sb->s_id, sb->s_type->name, + labeling_behaviors[sbsec->behavior-1]); + + sbsec->flags |= SE_SBINITIALIZED; + if (selinux_is_sblabel_mnt(sb)) + sbsec->flags |= SBLABEL_MNT; + + /* Initialize the root inode. */ + rc = inode_doinit_with_dentry(root_inode, root); + + /* Initialize any other inodes associated with the superblock, e.g. + inodes created prior to initial policy load or inodes created + during get_sb by a pseudo filesystem that directly + populates itself. */ + spin_lock(&sbsec->isec_lock); +next_inode: + if (!list_empty(&sbsec->isec_head)) { + struct inode_security_struct *isec = + list_entry(sbsec->isec_head.next, + struct inode_security_struct, list); + struct inode *inode = isec->inode; + spin_unlock(&sbsec->isec_lock); + inode = igrab(inode); + if (inode) { + if (!IS_PRIVATE(inode)) + inode_doinit(inode); + iput(inode); + } + spin_lock(&sbsec->isec_lock); + list_del_init(&isec->list); + goto next_inode; + } + spin_unlock(&sbsec->isec_lock); +out: + return rc; +} - while ((p = strsep(&options, "|")) != NULL) { - int token; - substring_t args[MAX_OPT_ARGS]; +/* + * This function should allow an FS to ask what it's mount security + * options were so it can use those later for submounts, displaying + * mount options, or whatever. + */ +static int selinux_get_mnt_opts(const struct super_block *sb, + struct security_mnt_opts *opts) +{ + int rc = 0, i; + struct superblock_security_struct *sbsec = sb->s_security; + char *context = NULL; + u32 len; + char tmp; - if (!*p) - continue; + security_init_mnt_opts(opts); - token = match_token(p, tokens, args); + if (!(sbsec->flags & SE_SBINITIALIZED)) + return -EINVAL; - switch (token) { - case Opt_context: - if (seen & (Opt_context|Opt_defcontext)) { - rc = -EINVAL; - printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); - goto out_free; - } - context = match_strdup(&args[0]); - if (!context) { - rc = -ENOMEM; - goto out_free; - } - if (!alloc) - alloc = 1; - seen |= Opt_context; - break; + if (!ss_initialized) + return -EINVAL; - case Opt_fscontext: - if (seen & Opt_fscontext) { - rc = -EINVAL; - printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); - goto out_free; - } - fscontext = match_strdup(&args[0]); - if (!fscontext) { - rc = -ENOMEM; - goto out_free; - } - if (!alloc) - alloc = 1; - seen |= Opt_fscontext; - break; + /* make sure we always check enough bits to cover the mask */ + BUILD_BUG_ON(SE_MNTMASK >= (1 << NUM_SEL_MNT_OPTS)); - case Opt_rootcontext: - if (seen & Opt_rootcontext) { - rc = -EINVAL; - printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); - goto out_free; - } - rootcontext = match_strdup(&args[0]); - if (!rootcontext) { - rc = -ENOMEM; - goto out_free; - } - if (!alloc) - alloc = 1; - seen |= Opt_rootcontext; - break; + tmp = sbsec->flags & SE_MNTMASK; + /* count the number of mount options for this sb */ + for (i = 0; i < NUM_SEL_MNT_OPTS; i++) { + if (tmp & 0x01) + opts->num_mnt_opts++; + tmp >>= 1; + } + /* Check if the Label support flag is set */ + if (sbsec->flags & SBLABEL_MNT) + opts->num_mnt_opts++; - case Opt_defcontext: - if (sbsec->behavior != SECURITY_FS_USE_XATTR) { - rc = -EINVAL; - printk(KERN_WARNING "SELinux: " - "defcontext option is invalid " - "for this filesystem type\n"); - goto out_free; - } - if (seen & (Opt_context|Opt_defcontext)) { - rc = -EINVAL; - printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); - goto out_free; - } - defcontext = match_strdup(&args[0]); - if (!defcontext) { - rc = -ENOMEM; - goto out_free; - } - if (!alloc) - alloc = 1; - seen |= Opt_defcontext; - break; + opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); + if (!opts->mnt_opts) { + rc = -ENOMEM; + goto out_free; + } - default: - rc = -EINVAL; - printk(KERN_WARNING "SELinux: unknown mount " - "option\n"); - goto out_free; + opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); + if (!opts->mnt_opts_flags) { + rc = -ENOMEM; + goto out_free; + } - } + i = 0; + if (sbsec->flags & FSCONTEXT_MNT) { + rc = security_sid_to_context(sbsec->sid, &context, &len); + if (rc) + goto out_free; + opts->mnt_opts[i] = context; + opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; + } + if (sbsec->flags & CONTEXT_MNT) { + rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); + if (rc) + goto out_free; + opts->mnt_opts[i] = context; + opts->mnt_opts_flags[i++] = CONTEXT_MNT; + } + if (sbsec->flags & DEFCONTEXT_MNT) { + rc = security_sid_to_context(sbsec->def_sid, &context, &len); + if (rc) + goto out_free; + opts->mnt_opts[i] = context; + opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; + } + if (sbsec->flags & ROOTCONTEXT_MNT) { + struct inode *root = sbsec->sb->s_root->d_inode; + struct inode_security_struct *isec = root->i_security; + + rc = security_sid_to_context(isec->sid, &context, &len); + if (rc) + goto out_free; + opts->mnt_opts[i] = context; + opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; + } + if (sbsec->flags & SBLABEL_MNT) { + opts->mnt_opts[i] = NULL; + opts->mnt_opts_flags[i++] = SBLABEL_MNT; + } + + BUG_ON(i != opts->num_mnt_opts); + + return 0; + +out_free: + security_free_mnt_opts(opts); + return rc; +} + +static int bad_option(struct superblock_security_struct *sbsec, char flag, + u32 old_sid, u32 new_sid) +{ + char mnt_flags = sbsec->flags & SE_MNTMASK; + + /* check if the old mount command had the same options */ + if (sbsec->flags & SE_SBINITIALIZED) + if (!(sbsec->flags & flag) || + (old_sid != new_sid)) + return 1; + + /* check if we were passed the same options twice, + * aka someone passed context=a,context=b + */ + if (!(sbsec->flags & SE_SBINITIALIZED)) + if (mnt_flags & flag) + return 1; + return 0; +} + +/* + * Allow filesystems with binary mount data to explicitly set mount point + * labeling information. + */ +static int selinux_set_mnt_opts(struct super_block *sb, + struct security_mnt_opts *opts, + unsigned long kern_flags, + unsigned long *set_kern_flags) +{ + const struct cred *cred = current_cred(); + int rc = 0, i; + struct superblock_security_struct *sbsec = sb->s_security; + const char *name = sb->s_type->name; + struct inode *inode = sbsec->sb->s_root->d_inode; + struct inode_security_struct *root_isec = inode->i_security; + u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; + u32 defcontext_sid = 0; + char **mount_options = opts->mnt_opts; + int *flags = opts->mnt_opts_flags; + int num_opts = opts->num_mnt_opts; + + mutex_lock(&sbsec->lock); + + if (!ss_initialized) { + if (!num_opts) { + /* Defer initialization until selinux_complete_init, + after the initial policy is loaded and the security + server is ready to handle calls. */ + goto out; } + rc = -EINVAL; + printk(KERN_WARNING "SELinux: Unable to set superblock options " + "before the security server is initialized\n"); + goto out; + } + if (kern_flags && !set_kern_flags) { + /* Specifying internal flags without providing a place to + * place the results is not allowed */ + rc = -EINVAL; + goto out; } - if (!seen) + /* + * Binary mount data FS will come through this function twice. Once + * from an explicit call and once from the generic calls from the vfs. + * Since the generic VFS calls will not contain any security mount data + * we need to skip the double mount verification. + * + * This does open a hole in which we will not notice if the first + * mount using this sb set explict options and a second mount using + * this sb does not set any security options. (The first options + * will be used for both mounts) + */ + if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) + && (num_opts == 0)) goto out; - /* sets the context of the superblock for the fs being mounted. */ - if (fscontext) { - rc = security_context_to_sid(fscontext, strlen(fscontext), &sid); + /* + * parse the mount options, check if they are valid sids. + * also check if someone is trying to mount the same sb more + * than once with different security options. + */ + for (i = 0; i < num_opts; i++) { + u32 sid; + + if (flags[i] == SBLABEL_MNT) + continue; + rc = security_context_to_sid(mount_options[i], + strlen(mount_options[i]), &sid, GFP_KERNEL); if (rc) { printk(KERN_WARNING "SELinux: security_context_to_sid" "(%s) failed for (dev %s, type %s) errno=%d\n", - fscontext, sb->s_id, name, rc); - goto out_free; + mount_options[i], sb->s_id, name, rc); + goto out; + } + switch (flags[i]) { + case FSCONTEXT_MNT: + fscontext_sid = sid; + + if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, + fscontext_sid)) + goto out_double_mount; + + sbsec->flags |= FSCONTEXT_MNT; + break; + case CONTEXT_MNT: + context_sid = sid; + + if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, + context_sid)) + goto out_double_mount; + + sbsec->flags |= CONTEXT_MNT; + break; + case ROOTCONTEXT_MNT: + rootcontext_sid = sid; + + if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, + rootcontext_sid)) + goto out_double_mount; + + sbsec->flags |= ROOTCONTEXT_MNT; + + break; + case DEFCONTEXT_MNT: + defcontext_sid = sid; + + if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, + defcontext_sid)) + goto out_double_mount; + + sbsec->flags |= DEFCONTEXT_MNT; + + break; + default: + rc = -EINVAL; + goto out; } + } + + if (sbsec->flags & SE_SBINITIALIZED) { + /* previously mounted with options, but not on this attempt? */ + if ((sbsec->flags & SE_MNTMASK) && !num_opts) + goto out_double_mount; + rc = 0; + goto out; + } - rc = may_context_mount_sb_relabel(sid, sbsec, tsec); + if (strcmp(sb->s_type->name, "proc") == 0) + sbsec->flags |= SE_SBPROC; + + if (!sbsec->behavior) { + /* + * Determine the labeling behavior to use for this + * filesystem type. + */ + rc = security_fs_use(sb); + if (rc) { + printk(KERN_WARNING + "%s: security_fs_use(%s) returned %d\n", + __func__, sb->s_type->name, rc); + goto out; + } + } + /* sets the context of the superblock for the fs being mounted. */ + if (fscontext_sid) { + rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); if (rc) - goto out_free; + goto out; - sbsec->sid = sid; + sbsec->sid = fscontext_sid; } /* @@ -513,182 +758,370 @@ static int try_context_mount(struct super_block *sb, void *data) * sets the label used on all file below the mountpoint, and will set * the superblock context if not already set. */ - if (context) { - rc = security_context_to_sid(context, strlen(context), &sid); - if (rc) { - printk(KERN_WARNING "SELinux: security_context_to_sid" - "(%s) failed for (dev %s, type %s) errno=%d\n", - context, sb->s_id, name, rc); - goto out_free; - } + if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) { + sbsec->behavior = SECURITY_FS_USE_NATIVE; + *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS; + } - if (!fscontext) { - rc = may_context_mount_sb_relabel(sid, sbsec, tsec); + if (context_sid) { + if (!fscontext_sid) { + rc = may_context_mount_sb_relabel(context_sid, sbsec, + cred); if (rc) - goto out_free; - sbsec->sid = sid; + goto out; + sbsec->sid = context_sid; } else { - rc = may_context_mount_inode_relabel(sid, sbsec, tsec); + rc = may_context_mount_inode_relabel(context_sid, sbsec, + cred); if (rc) - goto out_free; + goto out; } - sbsec->mntpoint_sid = sid; + if (!rootcontext_sid) + rootcontext_sid = context_sid; + sbsec->mntpoint_sid = context_sid; sbsec->behavior = SECURITY_FS_USE_MNTPOINT; } - if (rootcontext) { - struct inode *inode = sb->s_root->d_inode; - struct inode_security_struct *isec = inode->i_security; - rc = security_context_to_sid(rootcontext, strlen(rootcontext), &sid); - if (rc) { - printk(KERN_WARNING "SELinux: security_context_to_sid" - "(%s) failed for (dev %s, type %s) errno=%d\n", - rootcontext, sb->s_id, name, rc); - goto out_free; + if (rootcontext_sid) { + rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, + cred); + if (rc) + goto out; + + root_isec->sid = rootcontext_sid; + root_isec->initialized = 1; + } + + if (defcontext_sid) { + if (sbsec->behavior != SECURITY_FS_USE_XATTR && + sbsec->behavior != SECURITY_FS_USE_NATIVE) { + rc = -EINVAL; + printk(KERN_WARNING "SELinux: defcontext option is " + "invalid for this filesystem type\n"); + goto out; } - rc = may_context_mount_inode_relabel(sid, sbsec, tsec); - if (rc) - goto out_free; + if (defcontext_sid != sbsec->def_sid) { + rc = may_context_mount_inode_relabel(defcontext_sid, + sbsec, cred); + if (rc) + goto out; + } - isec->sid = sid; - isec->initialized = 1; + sbsec->def_sid = defcontext_sid; } - if (defcontext) { - rc = security_context_to_sid(defcontext, strlen(defcontext), &sid); - if (rc) { - printk(KERN_WARNING "SELinux: security_context_to_sid" - "(%s) failed for (dev %s, type %s) errno=%d\n", - defcontext, sb->s_id, name, rc); - goto out_free; + rc = sb_finish_set_opts(sb); +out: + mutex_unlock(&sbsec->lock); + return rc; +out_double_mount: + rc = -EINVAL; + printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " + "security settings for (dev %s, type %s)\n", sb->s_id, name); + goto out; +} + +static int selinux_cmp_sb_context(const struct super_block *oldsb, + const struct super_block *newsb) +{ + struct superblock_security_struct *old = oldsb->s_security; + struct superblock_security_struct *new = newsb->s_security; + char oldflags = old->flags & SE_MNTMASK; + char newflags = new->flags & SE_MNTMASK; + + if (oldflags != newflags) + goto mismatch; + if ((oldflags & FSCONTEXT_MNT) && old->sid != new->sid) + goto mismatch; + if ((oldflags & CONTEXT_MNT) && old->mntpoint_sid != new->mntpoint_sid) + goto mismatch; + if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid) + goto mismatch; + if (oldflags & ROOTCONTEXT_MNT) { + struct inode_security_struct *oldroot = oldsb->s_root->d_inode->i_security; + struct inode_security_struct *newroot = newsb->s_root->d_inode->i_security; + if (oldroot->sid != newroot->sid) + goto mismatch; + } + return 0; +mismatch: + printk(KERN_WARNING "SELinux: mount invalid. Same superblock, " + "different security settings for (dev %s, " + "type %s)\n", newsb->s_id, newsb->s_type->name); + return -EBUSY; +} + +static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb, + struct super_block *newsb) +{ + const struct superblock_security_struct *oldsbsec = oldsb->s_security; + struct superblock_security_struct *newsbsec = newsb->s_security; + + int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); + int set_context = (oldsbsec->flags & CONTEXT_MNT); + int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); + + /* + * if the parent was able to be mounted it clearly had no special lsm + * mount options. thus we can safely deal with this superblock later + */ + if (!ss_initialized) + return 0; + + /* how can we clone if the old one wasn't set up?? */ + BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED)); + + /* if fs is reusing a sb, make sure that the contexts match */ + if (newsbsec->flags & SE_SBINITIALIZED) + return selinux_cmp_sb_context(oldsb, newsb); + + mutex_lock(&newsbsec->lock); + + newsbsec->flags = oldsbsec->flags; + + newsbsec->sid = oldsbsec->sid; + newsbsec->def_sid = oldsbsec->def_sid; + newsbsec->behavior = oldsbsec->behavior; + + if (set_context) { + u32 sid = oldsbsec->mntpoint_sid; + + if (!set_fscontext) + newsbsec->sid = sid; + if (!set_rootcontext) { + struct inode *newinode = newsb->s_root->d_inode; + struct inode_security_struct *newisec = newinode->i_security; + newisec->sid = sid; } + newsbsec->mntpoint_sid = sid; + } + if (set_rootcontext) { + const struct inode *oldinode = oldsb->s_root->d_inode; + const struct inode_security_struct *oldisec = oldinode->i_security; + struct inode *newinode = newsb->s_root->d_inode; + struct inode_security_struct *newisec = newinode->i_security; - if (sid == sbsec->def_sid) - goto out_free; + newisec->sid = oldisec->sid; + } - rc = may_context_mount_inode_relabel(sid, sbsec, tsec); - if (rc) - goto out_free; + sb_finish_set_opts(newsb); + mutex_unlock(&newsbsec->lock); + return 0; +} + +static int selinux_parse_opts_str(char *options, + struct security_mnt_opts *opts) +{ + char *p; + char *context = NULL, *defcontext = NULL; + char *fscontext = NULL, *rootcontext = NULL; + int rc, num_mnt_opts = 0; + + opts->num_mnt_opts = 0; + + /* Standard string-based options. */ + while ((p = strsep(&options, "|")) != NULL) { + int token; + substring_t args[MAX_OPT_ARGS]; + + if (!*p) + continue; + + token = match_token(p, tokens, args); + + switch (token) { + case Opt_context: + if (context || defcontext) { + rc = -EINVAL; + printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); + goto out_err; + } + context = match_strdup(&args[0]); + if (!context) { + rc = -ENOMEM; + goto out_err; + } + break; + + case Opt_fscontext: + if (fscontext) { + rc = -EINVAL; + printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); + goto out_err; + } + fscontext = match_strdup(&args[0]); + if (!fscontext) { + rc = -ENOMEM; + goto out_err; + } + break; - sbsec->def_sid = sid; + case Opt_rootcontext: + if (rootcontext) { + rc = -EINVAL; + printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); + goto out_err; + } + rootcontext = match_strdup(&args[0]); + if (!rootcontext) { + rc = -ENOMEM; + goto out_err; + } + break; + + case Opt_defcontext: + if (context || defcontext) { + rc = -EINVAL; + printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); + goto out_err; + } + defcontext = match_strdup(&args[0]); + if (!defcontext) { + rc = -ENOMEM; + goto out_err; + } + break; + case Opt_labelsupport: + break; + default: + rc = -EINVAL; + printk(KERN_WARNING "SELinux: unknown mount option\n"); + goto out_err; + + } } -out_free: - if (alloc) { - kfree(context); - kfree(defcontext); - kfree(fscontext); - kfree(rootcontext); + rc = -ENOMEM; + opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); + if (!opts->mnt_opts) + goto out_err; + + opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); + if (!opts->mnt_opts_flags) { + kfree(opts->mnt_opts); + goto out_err; } -out: + + if (fscontext) { + opts->mnt_opts[num_mnt_opts] = fscontext; + opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; + } + if (context) { + opts->mnt_opts[num_mnt_opts] = context; + opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; + } + if (rootcontext) { + opts->mnt_opts[num_mnt_opts] = rootcontext; + opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; + } + if (defcontext) { + opts->mnt_opts[num_mnt_opts] = defcontext; + opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; + } + + opts->num_mnt_opts = num_mnt_opts; + return 0; + +out_err: + kfree(context); + kfree(defcontext); + kfree(fscontext); + kfree(rootcontext); return rc; } - +/* + * string mount options parsing and call set the sbsec + */ static int superblock_doinit(struct super_block *sb, void *data) { - struct superblock_security_struct *sbsec = sb->s_security; - struct dentry *root = sb->s_root; - struct inode *inode = root->d_inode; int rc = 0; + char *options = data; + struct security_mnt_opts opts; - mutex_lock(&sbsec->lock); - if (sbsec->initialized) - goto out; + security_init_mnt_opts(&opts); - if (!ss_initialized) { - /* Defer initialization until selinux_complete_init, - after the initial policy is loaded and the security - server is ready to handle calls. */ - spin_lock(&sb_security_lock); - if (list_empty(&sbsec->list)) - list_add(&sbsec->list, &superblock_security_head); - spin_unlock(&sb_security_lock); + if (!data) goto out; - } - /* Determine the labeling behavior to use for this filesystem type. */ - rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); - if (rc) { - printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", - __FUNCTION__, sb->s_type->name, rc); - goto out; - } + BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); - rc = try_context_mount(sb, data); + rc = selinux_parse_opts_str(options, &opts); if (rc) - goto out; + goto out_err; - if (sbsec->behavior == SECURITY_FS_USE_XATTR) { - /* Make sure that the xattr handler exists and that no - error other than -ENODATA is returned by getxattr on - the root directory. -ENODATA is ok, as this may be - the first boot of the SELinux kernel before we have - assigned xattr values to the filesystem. */ - if (!inode->i_op->getxattr) { - printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " - "xattr support\n", sb->s_id, sb->s_type->name); - rc = -EOPNOTSUPP; - goto out; - } - rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); - if (rc < 0 && rc != -ENODATA) { - if (rc == -EOPNOTSUPP) - printk(KERN_WARNING "SELinux: (dev %s, type " - "%s) has no security xattr handler\n", - sb->s_id, sb->s_type->name); - else - printk(KERN_WARNING "SELinux: (dev %s, type " - "%s) getxattr errno %d\n", sb->s_id, - sb->s_type->name, -rc); - goto out; - } - } +out: + rc = selinux_set_mnt_opts(sb, &opts, 0, NULL); - if (strcmp(sb->s_type->name, "proc") == 0) - sbsec->proc = 1; +out_err: + security_free_mnt_opts(&opts); + return rc; +} - sbsec->initialized = 1; +static void selinux_write_opts(struct seq_file *m, + struct security_mnt_opts *opts) +{ + int i; + char *prefix; - if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) { - printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", - sb->s_id, sb->s_type->name); - } - else { - printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", - sb->s_id, sb->s_type->name, - labeling_behaviors[sbsec->behavior-1]); + for (i = 0; i < opts->num_mnt_opts; i++) { + char *has_comma; + + if (opts->mnt_opts[i]) + has_comma = strchr(opts->mnt_opts[i], ','); + else + has_comma = NULL; + + switch (opts->mnt_opts_flags[i]) { + case CONTEXT_MNT: + prefix = CONTEXT_STR; + break; + case FSCONTEXT_MNT: + prefix = FSCONTEXT_STR; + break; + case ROOTCONTEXT_MNT: + prefix = ROOTCONTEXT_STR; + break; + case DEFCONTEXT_MNT: + prefix = DEFCONTEXT_STR; + break; + case SBLABEL_MNT: + seq_putc(m, ','); + seq_puts(m, LABELSUPP_STR); + continue; + default: + BUG(); + return; + }; + /* we need a comma before each option */ + seq_putc(m, ','); + seq_puts(m, prefix); + if (has_comma) + seq_putc(m, '\"'); + seq_puts(m, opts->mnt_opts[i]); + if (has_comma) + seq_putc(m, '\"'); } +} - /* Initialize the root inode. */ - rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root); +static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) +{ + struct security_mnt_opts opts; + int rc; - /* Initialize any other inodes associated with the superblock, e.g. - inodes created prior to initial policy load or inodes created - during get_sb by a pseudo filesystem that directly - populates itself. */ - spin_lock(&sbsec->isec_lock); -next_inode: - if (!list_empty(&sbsec->isec_head)) { - struct inode_security_struct *isec = - list_entry(sbsec->isec_head.next, - struct inode_security_struct, list); - struct inode *inode = isec->inode; - spin_unlock(&sbsec->isec_lock); - inode = igrab(inode); - if (inode) { - if (!IS_PRIVATE (inode)) - inode_doinit(inode); - iput(inode); - } - spin_lock(&sbsec->isec_lock); - list_del_init(&isec->list); - goto next_inode; + rc = selinux_get_mnt_opts(sb, &opts); + if (rc) { + /* before policy load we may get EINVAL, don't show anything */ + if (rc == -EINVAL) + rc = 0; + return rc; } - spin_unlock(&sbsec->isec_lock); -out: - mutex_unlock(&sbsec->lock); + + selinux_write_opts(m, &opts); + + security_free_mnt_opts(&opts); + return rc; } @@ -762,7 +1195,7 @@ static inline u16 socket_type_to_security_class(int family, int type, int protoc return SECCLASS_NETLINK_ROUTE_SOCKET; case NETLINK_FIREWALL: return SECCLASS_NETLINK_FIREWALL_SOCKET; - case NETLINK_INET_DIAG: + case NETLINK_SOCK_DIAG: return SECCLASS_NETLINK_TCPDIAG_SOCKET; case NETLINK_NFLOG: return SECCLASS_NETLINK_NFLOG_SOCKET; @@ -793,39 +1226,35 @@ static inline u16 socket_type_to_security_class(int family, int type, int protoc } #ifdef CONFIG_PROC_FS -static int selinux_proc_get_sid(struct proc_dir_entry *de, +static int selinux_proc_get_sid(struct dentry *dentry, u16 tclass, u32 *sid) { - int buflen, rc; - char *buffer, *path, *end; + int rc; + char *buffer, *path; - buffer = (char*)__get_free_page(GFP_KERNEL); + buffer = (char *)__get_free_page(GFP_KERNEL); if (!buffer) return -ENOMEM; - buflen = PAGE_SIZE; - end = buffer+buflen; - *--end = '\0'; - buflen--; - path = end-1; - *path = '/'; - while (de && de != de->parent) { - buflen -= de->namelen + 1; - if (buflen < 0) - break; - end -= de->namelen; - memcpy(end, de->name, de->namelen); - *--end = '/'; - path = end; - de = de->parent; + path = dentry_path_raw(dentry, buffer, PAGE_SIZE); + if (IS_ERR(path)) + rc = PTR_ERR(path); + else { + /* each process gets a /proc/PID/ entry. Strip off the + * PID part to get a valid selinux labeling. + * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */ + while (path[1] >= '0' && path[1] <= '9') { + path[1] = '/'; + path++; + } + rc = security_genfs_sid("proc", path, tclass, sid); } - rc = security_genfs_sid("proc", path, tclass, sid); free_page((unsigned long)buffer); return rc; } #else -static int selinux_proc_get_sid(struct proc_dir_entry *de, +static int selinux_proc_get_sid(struct dentry *dentry, u16 tclass, u32 *sid) { @@ -853,7 +1282,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent goto out_unlock; sbsec = inode->i_sb->s_security; - if (!sbsec->initialized) { + if (!(sbsec->flags & SE_SBINITIALIZED)) { /* Defer initialization until selinux_complete_init, after the initial policy is loaded and the security server is ready to handle calls. */ @@ -865,6 +1294,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent } switch (sbsec->behavior) { + case SECURITY_FS_USE_NATIVE: + break; case SECURITY_FS_USE_XATTR: if (!inode->i_op->getxattr) { isec->sid = sbsec->def_sid; @@ -881,22 +1312,31 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent dentry = d_find_alias(inode); } if (!dentry) { - printk(KERN_WARNING "%s: no dentry for dev=%s " - "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id, - inode->i_ino); + /* + * this is can be hit on boot when a file is accessed + * before the policy is loaded. When we load policy we + * may find inodes that have no dentry on the + * sbsec->isec_head list. No reason to complain as these + * will get fixed up the next time we go through + * inode_doinit with a dentry, before these inodes could + * be used again by userspace. + */ goto out_unlock; } len = INITCONTEXTLEN; - context = kmalloc(len, GFP_KERNEL); + context = kmalloc(len+1, GFP_NOFS); if (!context) { rc = -ENOMEM; dput(dentry); goto out_unlock; } + context[len] = '\0'; rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, context, len); if (rc == -ERANGE) { + kfree(context); + /* Need a larger buffer. Query for the right size. */ rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, NULL, 0); @@ -904,14 +1344,14 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent dput(dentry); goto out_unlock; } - kfree(context); len = rc; - context = kmalloc(len, GFP_KERNEL); + context = kmalloc(len+1, GFP_NOFS); if (!context) { rc = -ENOMEM; dput(dentry); goto out_unlock; } + context[len] = '\0'; rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, context, len); @@ -919,8 +1359,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent dput(dentry); if (rc < 0) { if (rc != -ENODATA) { - printk(KERN_WARNING "%s: getxattr returned " - "%d for dev=%s ino=%ld\n", __FUNCTION__, + printk(KERN_WARNING "SELinux: %s: getxattr returned " + "%d for dev=%s ino=%ld\n", __func__, -rc, inode->i_sb->s_id, inode->i_ino); kfree(context); goto out_unlock; @@ -930,12 +1370,22 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent rc = 0; } else { rc = security_context_to_sid_default(context, rc, &sid, - sbsec->def_sid); + sbsec->def_sid, + GFP_NOFS); if (rc) { - printk(KERN_WARNING "%s: context_to_sid(%s) " - "returned %d for dev=%s ino=%ld\n", - __FUNCTION__, context, -rc, - inode->i_sb->s_id, inode->i_ino); + char *dev = inode->i_sb->s_id; + unsigned long ino = inode->i_ino; + + if (rc == -EINVAL) { + if (printk_ratelimit()) + printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid " + "context=%s. This indicates you may need to relabel the inode or the " + "filesystem in question.\n", ino, dev, context); + } else { + printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " + "returned %d for dev=%s ino=%ld\n", + __func__, context, -rc, dev, ino); + } kfree(context); /* Leave with the unlabeled SID */ rc = 0; @@ -954,10 +1404,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* Try to obtain a transition SID. */ isec->sclass = inode_mode_to_security_class(inode->i_mode); - rc = security_transition_sid(isec->task_sid, - sbsec->sid, - isec->sclass, - &sid); + rc = security_transition_sid(isec->task_sid, sbsec->sid, + isec->sclass, NULL, &sid); if (rc) goto out_unlock; isec->sid = sid; @@ -969,17 +1417,34 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* Default to the fs superblock SID. */ isec->sid = sbsec->sid; - if (sbsec->proc) { - struct proc_inode *proci = PROC_I(inode); - if (proci->pde) { - isec->sclass = inode_mode_to_security_class(inode->i_mode); - rc = selinux_proc_get_sid(proci->pde, - isec->sclass, - &sid); - if (rc) - goto out_unlock; - isec->sid = sid; - } + if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) { + /* We must have a dentry to determine the label on + * procfs inodes */ + if (opt_dentry) + /* Called from d_instantiate or + * d_splice_alias. */ + dentry = dget(opt_dentry); + else + /* Called from selinux_complete_init, try to + * find a dentry. */ + dentry = d_find_alias(inode); + /* + * This can be hit on boot when a file is accessed + * before the policy is loaded. When we load policy we + * may find inodes that have no dentry on the + * sbsec->isec_head list. No reason to complain as + * these will get fixed up the next time we go through + * inode_doinit() with a dentry, before these inodes + * could be used again by userspace. + */ + if (!dentry) + goto out_unlock; + isec->sclass = inode_mode_to_security_class(inode->i_mode); + rc = selinux_proc_get_sid(dentry, isec->sclass, &sid); + dput(dentry); + if (rc) + goto out_unlock; + isec->sid = sid; } break; } @@ -1021,90 +1486,168 @@ static inline u32 signal_to_av(int sig) return perm; } -/* Check permission betweeen a pair of tasks, e.g. signal checks, - fork check, ptrace check, etc. */ -static int task_has_perm(struct task_struct *tsk1, - struct task_struct *tsk2, +/* + * Check permission between a pair of credentials + * fork check, ptrace check, etc. + */ +static int cred_has_perm(const struct cred *actor, + const struct cred *target, u32 perms) { - struct task_security_struct *tsec1, *tsec2; + u32 asid = cred_sid(actor), tsid = cred_sid(target); - tsec1 = tsk1->security; - tsec2 = tsk2->security; - return avc_has_perm(tsec1->sid, tsec2->sid, - SECCLASS_PROCESS, perms, NULL); + return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); } -/* Check whether a task is allowed to use a capability. */ -static int task_has_capability(struct task_struct *tsk, - int cap) +/* + * Check permission between a pair of tasks, e.g. signal checks, + * fork check, ptrace check, etc. + * tsk1 is the actor and tsk2 is the target + * - this uses the default subjective creds of tsk1 + */ +static int task_has_perm(const struct task_struct *tsk1, + const struct task_struct *tsk2, + u32 perms) { - struct task_security_struct *tsec; - struct avc_audit_data ad; + const struct task_security_struct *__tsec1, *__tsec2; + u32 sid1, sid2; - tsec = tsk->security; + rcu_read_lock(); + __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; + __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; + rcu_read_unlock(); + return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); +} - AVC_AUDIT_DATA_INIT(&ad,CAP); - ad.tsk = tsk; +/* + * Check permission between current and another task, e.g. signal checks, + * fork check, ptrace check, etc. + * current is the actor and tsk2 is the target + * - this uses current's subjective creds + */ +static int current_has_perm(const struct task_struct *tsk, + u32 perms) +{ + u32 sid, tsid; + + sid = current_sid(); + tsid = task_sid(tsk); + return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); +} + +#if CAP_LAST_CAP > 63 +#error Fix SELinux to handle capabilities > 63. +#endif + +/* Check whether a task is allowed to use a capability. */ +static int cred_has_capability(const struct cred *cred, + int cap, int audit) +{ + struct common_audit_data ad; + struct av_decision avd; + u16 sclass; + u32 sid = cred_sid(cred); + u32 av = CAP_TO_MASK(cap); + int rc; + + ad.type = LSM_AUDIT_DATA_CAP; ad.u.cap = cap; - return avc_has_perm(tsec->sid, tsec->sid, - SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad); + switch (CAP_TO_INDEX(cap)) { + case 0: + sclass = SECCLASS_CAPABILITY; + break; + case 1: + sclass = SECCLASS_CAPABILITY2; + break; + default: + printk(KERN_ERR + "SELinux: out of range capability %d\n", cap); + BUG(); + return -EINVAL; + } + + rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); + if (audit == SECURITY_CAP_AUDIT) { + int rc2 = avc_audit(sid, sid, sclass, av, &avd, rc, &ad); + if (rc2) + return rc2; + } + return rc; } /* Check whether a task is allowed to use a system operation. */ static int task_has_system(struct task_struct *tsk, u32 perms) { - struct task_security_struct *tsec; - - tsec = tsk->security; + u32 sid = task_sid(tsk); - return avc_has_perm(tsec->sid, SECINITSID_KERNEL, + return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, perms, NULL); } /* Check whether a task has a particular permission to an inode. The 'adp' parameter is optional and allows other audit data to be passed (e.g. the dentry). */ -static int inode_has_perm(struct task_struct *tsk, +static int inode_has_perm(const struct cred *cred, struct inode *inode, u32 perms, - struct avc_audit_data *adp) + struct common_audit_data *adp) { - struct task_security_struct *tsec; struct inode_security_struct *isec; - struct avc_audit_data ad; + u32 sid; - if (unlikely (IS_PRIVATE (inode))) + validate_creds(cred); + + if (unlikely(IS_PRIVATE(inode))) return 0; - tsec = tsk->security; + sid = cred_sid(cred); isec = inode->i_security; - if (!adp) { - adp = &ad; - AVC_AUDIT_DATA_INIT(&ad, FS); - ad.u.fs.inode = inode; - } - - return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); + return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); } /* Same as inode_has_perm, but pass explicit audit data containing the dentry to help the auditing code to more easily generate the pathname if needed. */ -static inline int dentry_has_perm(struct task_struct *tsk, - struct vfsmount *mnt, +static inline int dentry_has_perm(const struct cred *cred, struct dentry *dentry, u32 av) { struct inode *inode = dentry->d_inode; - struct avc_audit_data ad; - AVC_AUDIT_DATA_INIT(&ad,FS); - ad.u.fs.mnt = mnt; - ad.u.fs.dentry = dentry; - return inode_has_perm(tsk, inode, av, &ad); + struct common_audit_data ad; + + ad.type = LSM_AUDIT_DATA_DENTRY; + ad.u.dentry = dentry; + return inode_has_perm(cred, inode, av, &ad); +} + +/* Same as inode_has_perm, but pass explicit audit data containing + the path to help the auditing code to more easily generate the + pathname if needed. */ +static inline int path_has_perm(const struct cred *cred, + struct path *path, + u32 av) +{ + struct inode *inode = path->dentry->d_inode; + struct common_audit_data ad; + + ad.type = LSM_AUDIT_DATA_PATH; + ad.u.path = *path; + return inode_has_perm(cred, inode, av, &ad); +} + +/* Same as path_has_perm, but uses the inode from the file struct. */ +static inline int file_path_has_perm(const struct cred *cred, + struct file *file, + u32 av) +{ + struct common_audit_data ad; + + ad.type = LSM_AUDIT_DATA_PATH; + ad.u.path = file->f_path; + return inode_has_perm(cred, file_inode(file), av, &ad); } /* Check whether a task can use an open file descriptor to @@ -1115,36 +1658,35 @@ static inline int dentry_has_perm(struct task_struct *tsk, has the same SID as the process. If av is zero, then access to the file is not checked, e.g. for cases where only the descriptor is affected like seek. */ -static int file_has_perm(struct task_struct *tsk, - struct file *file, - u32 av) +static int file_has_perm(const struct cred *cred, + struct file *file, + u32 av) { - struct task_security_struct *tsec = tsk->security; struct file_security_struct *fsec = file->f_security; - struct vfsmount *mnt = file->f_path.mnt; - struct dentry *dentry = file->f_path.dentry; - struct inode *inode = dentry->d_inode; - struct avc_audit_data ad; + struct inode *inode = file_inode(file); + struct common_audit_data ad; + u32 sid = cred_sid(cred); int rc; - AVC_AUDIT_DATA_INIT(&ad, FS); - ad.u.fs.mnt = mnt; - ad.u.fs.dentry = dentry; + ad.type = LSM_AUDIT_DATA_PATH; + ad.u.path = file->f_path; - if (tsec->sid != fsec->sid) { - rc = avc_has_perm(tsec->sid, fsec->sid, + if (sid != fsec->sid) { + rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad); if (rc) - return rc; + goto out; } /* av is zero if only checking access to the descriptor. */ + rc = 0; if (av) - return inode_has_perm(tsk, inode, av, &ad); + rc = inode_has_perm(cred, inode, av, &ad); - return 0; +out: + return rc; } /* Check whether a task can create a file. */ @@ -1152,36 +1694,36 @@ static int may_create(struct inode *dir, struct dentry *dentry, u16 tclass) { - struct task_security_struct *tsec; + const struct task_security_struct *tsec = current_security(); struct inode_security_struct *dsec; struct superblock_security_struct *sbsec; - u32 newsid; - struct avc_audit_data ad; + u32 sid, newsid; + struct common_audit_data ad; int rc; - tsec = current->security; dsec = dir->i_security; sbsec = dir->i_sb->s_security; - AVC_AUDIT_DATA_INIT(&ad, FS); - ad.u.fs.dentry = dentry; + sid = tsec->sid; + newsid = tsec->create_sid; + + ad.type = LSM_AUDIT_DATA_DENTRY; + ad.u.dentry = dentry; - rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, + rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, DIR__ADD_NAME | DIR__SEARCH, &ad); if (rc) return rc; - if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { - newsid = tsec->create_sid; - } else { - rc = security_transition_sid(tsec->sid, dsec->sid, tclass, - &newsid); + if (!newsid || !(sbsec->flags & SBLABEL_MNT)) { + rc = security_transition_sid(sid, dsec->sid, tclass, + &dentry->d_name, &newsid); if (rc) return rc; } - rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); + rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); if (rc) return rc; @@ -1194,16 +1736,14 @@ static int may_create(struct inode *dir, static int may_create_key(u32 ksid, struct task_struct *ctx) { - struct task_security_struct *tsec; + u32 sid = task_sid(ctx); - tsec = ctx->security; - - return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); + return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); } -#define MAY_LINK 0 -#define MAY_UNLINK 1 -#define MAY_RMDIR 2 +#define MAY_LINK 0 +#define MAY_UNLINK 1 +#define MAY_RMDIR 2 /* Check whether a task can link, unlink, or rmdir a file/directory. */ static int may_link(struct inode *dir, @@ -1211,22 +1751,21 @@ static int may_link(struct inode *dir, int kind) { - struct task_security_struct *tsec; struct inode_security_struct *dsec, *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); u32 av; int rc; - tsec = current->security; dsec = dir->i_security; isec = dentry->d_inode->i_security; - AVC_AUDIT_DATA_INIT(&ad, FS); - ad.u.fs.dentry = dentry; + ad.type = LSM_AUDIT_DATA_DENTRY; + ad.u.dentry = dentry; av = DIR__SEARCH; av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); - rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); + rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); if (rc) return rc; @@ -1241,11 +1780,12 @@ static int may_link(struct inode *dir, av = DIR__RMDIR; break; default: - printk(KERN_WARNING "may_link: unrecognized kind %d\n", kind); + printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", + __func__, kind); return 0; } - rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); + rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); return rc; } @@ -1254,48 +1794,47 @@ static inline int may_rename(struct inode *old_dir, struct inode *new_dir, struct dentry *new_dentry) { - struct task_security_struct *tsec; struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); u32 av; int old_is_dir, new_is_dir; int rc; - tsec = current->security; old_dsec = old_dir->i_security; old_isec = old_dentry->d_inode->i_security; old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); new_dsec = new_dir->i_security; - AVC_AUDIT_DATA_INIT(&ad, FS); + ad.type = LSM_AUDIT_DATA_DENTRY; - ad.u.fs.dentry = old_dentry; - rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, + ad.u.dentry = old_dentry; + rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, DIR__REMOVE_NAME | DIR__SEARCH, &ad); if (rc) return rc; - rc = avc_has_perm(tsec->sid, old_isec->sid, + rc = avc_has_perm(sid, old_isec->sid, old_isec->sclass, FILE__RENAME, &ad); if (rc) return rc; if (old_is_dir && new_dir != old_dir) { - rc = avc_has_perm(tsec->sid, old_isec->sid, + rc = avc_has_perm(sid, old_isec->sid, old_isec->sclass, DIR__REPARENT, &ad); if (rc) return rc; } - ad.u.fs.dentry = new_dentry; + ad.u.dentry = new_dentry; av = DIR__ADD_NAME | DIR__SEARCH; if (new_dentry->d_inode) av |= DIR__REMOVE_NAME; - rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); + rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); if (rc) return rc; if (new_dentry->d_inode) { new_isec = new_dentry->d_inode->i_security; new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); - rc = avc_has_perm(tsec->sid, new_isec->sid, + rc = avc_has_perm(sid, new_isec->sid, new_isec->sclass, (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); if (rc) @@ -1306,18 +1845,16 @@ static inline int may_rename(struct inode *old_dir, } /* Check whether a task can perform a filesystem operation. */ -static int superblock_has_perm(struct task_struct *tsk, +static int superblock_has_perm(const struct cred *cred, struct super_block *sb, u32 perms, - struct avc_audit_data *ad) + struct common_audit_data *ad) { - struct task_security_struct *tsec; struct superblock_security_struct *sbsec; + u32 sid = cred_sid(cred); - tsec = tsk->security; sbsec = sb->s_security; - return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, - perms, ad); + return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); } /* Convert a Linux mode and permission mask to an access vector. */ @@ -1325,7 +1862,7 @@ static inline u32 file_mask_to_av(int mode, int mask) { u32 av = 0; - if ((mode & S_IFMT) != S_IFDIR) { + if (!S_ISDIR(mode)) { if (mask & MAY_EXEC) av |= FILE__EXECUTE; if (mask & MAY_READ) @@ -1361,213 +1898,168 @@ static inline u32 file_to_av(struct file *file) else av |= FILE__WRITE; } + if (!av) { + /* + * Special file opened with flags 3 for ioctl-only use. + */ + av = FILE__IOCTL; + } + + return av; +} + +/* + * Convert a file to an access vector and include the correct open + * open permission. + */ +static inline u32 open_file_to_av(struct file *file) +{ + u32 av = file_to_av(file); + + if (selinux_policycap_openperm) + av |= FILE__OPEN; return av; } /* Hook functions begin here. */ -static int selinux_ptrace(struct task_struct *parent, struct task_struct *child) +static int selinux_ptrace_access_check(struct task_struct *child, + unsigned int mode) { - struct task_security_struct *psec = parent->security; - struct task_security_struct *csec = child->security; int rc; - rc = secondary_ops->ptrace(parent,child); + rc = cap_ptrace_access_check(child, mode); if (rc) return rc; - rc = task_has_perm(parent, child, PROCESS__PTRACE); - /* Save the SID of the tracing process for later use in apply_creds. */ - if (!(child->ptrace & PT_PTRACED) && !rc) - csec->ptrace_sid = psec->sid; - return rc; + if (mode & PTRACE_MODE_READ) { + u32 sid = current_sid(); + u32 csid = task_sid(child); + return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); + } + + return current_has_perm(child, PROCESS__PTRACE); } -static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, - kernel_cap_t *inheritable, kernel_cap_t *permitted) +static int selinux_ptrace_traceme(struct task_struct *parent) { - int error; + int rc; - error = task_has_perm(current, target, PROCESS__GETCAP); - if (error) - return error; + rc = cap_ptrace_traceme(parent); + if (rc) + return rc; - return secondary_ops->capget(target, effective, inheritable, permitted); + return task_has_perm(parent, current, PROCESS__PTRACE); } -static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective, - kernel_cap_t *inheritable, kernel_cap_t *permitted) +static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, + kernel_cap_t *inheritable, kernel_cap_t *permitted) { int error; - error = secondary_ops->capset_check(target, effective, inheritable, permitted); + error = current_has_perm(target, PROCESS__GETCAP); if (error) return error; - return task_has_perm(current, target, PROCESS__SETCAP); -} - -static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective, - kernel_cap_t *inheritable, kernel_cap_t *permitted) -{ - secondary_ops->capset_set(target, effective, inheritable, permitted); + return cap_capget(target, effective, inheritable, permitted); } -static int selinux_capable(struct task_struct *tsk, int cap) +static int selinux_capset(struct cred *new, const struct cred *old, + const kernel_cap_t *effective, + const kernel_cap_t *inheritable, + const kernel_cap_t *permitted) { - int rc; + int error; - rc = secondary_ops->capable(tsk, cap); - if (rc) - return rc; + error = cap_capset(new, old, + effective, inheritable, permitted); + if (error) + return error; - return task_has_capability(tsk,cap); + return cred_has_perm(old, new, PROCESS__SETCAP); } -static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) -{ - int buflen, rc; - char *buffer, *path, *end; - - rc = -ENOMEM; - buffer = (char*)__get_free_page(GFP_KERNEL); - if (!buffer) - goto out; - - buflen = PAGE_SIZE; - end = buffer+buflen; - *--end = '\0'; - buflen--; - path = end-1; - *path = '/'; - while (table) { - const char *name = table->procname; - size_t namelen = strlen(name); - buflen -= namelen + 1; - if (buflen < 0) - goto out_free; - end -= namelen; - memcpy(end, name, namelen); - *--end = '/'; - path = end; - table = table->parent; - } - buflen -= 4; - if (buflen < 0) - goto out_free; - end -= 4; - memcpy(end, "/sys", 4); - path = end; - rc = security_genfs_sid("proc", path, tclass, sid); -out_free: - free_page((unsigned long)buffer); -out: - return rc; -} +/* + * (This comment used to live with the selinux_task_setuid hook, + * which was removed). + * + * Since setuid only affects the current process, and since the SELinux + * controls are not based on the Linux identity attributes, SELinux does not + * need to control this operation. However, SELinux does control the use of + * the CAP_SETUID and CAP_SETGID capabilities using the capable hook. + */ -static int selinux_sysctl(ctl_table *table, int op) +static int selinux_capable(const struct cred *cred, struct user_namespace *ns, + int cap, int audit) { - int error = 0; - u32 av; - struct task_security_struct *tsec; - u32 tsid; int rc; - rc = secondary_ops->sysctl(table, op); + rc = cap_capable(cred, ns, cap, audit); if (rc) return rc; - tsec = current->security; - - rc = selinux_sysctl_get_sid(table, (op == 0001) ? - SECCLASS_DIR : SECCLASS_FILE, &tsid); - if (rc) { - /* Default to the well-defined sysctl SID. */ - tsid = SECINITSID_SYSCTL; - } - - /* The op values are "defined" in sysctl.c, thereby creating - * a bad coupling between this module and sysctl.c */ - if(op == 001) { - error = avc_has_perm(tsec->sid, tsid, - SECCLASS_DIR, DIR__SEARCH, NULL); - } else { - av = 0; - if (op & 004) - av |= FILE__READ; - if (op & 002) - av |= FILE__WRITE; - if (av) - error = avc_has_perm(tsec->sid, tsid, - SECCLASS_FILE, av, NULL); - } - - return error; + return cred_has_capability(cred, cap, audit); } static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) { + const struct cred *cred = current_cred(); int rc = 0; if (!sb) return 0; switch (cmds) { - case Q_SYNC: - case Q_QUOTAON: - case Q_QUOTAOFF: - case Q_SETINFO: - case Q_SETQUOTA: - rc = superblock_has_perm(current, - sb, - FILESYSTEM__QUOTAMOD, NULL); - break; - case Q_GETFMT: - case Q_GETINFO: - case Q_GETQUOTA: - rc = superblock_has_perm(current, - sb, - FILESYSTEM__QUOTAGET, NULL); - break; - default: - rc = 0; /* let the kernel handle invalid cmds */ - break; + case Q_SYNC: + case Q_QUOTAON: + case Q_QUOTAOFF: + case Q_SETINFO: + case Q_SETQUOTA: + rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); + break; + case Q_GETFMT: + case Q_GETINFO: + case Q_GETQUOTA: + rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); + break; + default: + rc = 0; /* let the kernel handle invalid cmds */ + break; } return rc; } static int selinux_quota_on(struct dentry *dentry) { - return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, dentry, FILE__QUOTAON); } static int selinux_syslog(int type) { int rc; - rc = secondary_ops->syslog(type); - if (rc) - return rc; - switch (type) { - case 3: /* Read last kernel messages */ - case 10: /* Return size of the log buffer */ - rc = task_has_system(current, SYSTEM__SYSLOG_READ); - break; - case 6: /* Disable logging to console */ - case 7: /* Enable logging to console */ - case 8: /* Set level of messages printed to console */ - rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); - break; - case 0: /* Close log */ - case 1: /* Open log */ - case 2: /* Read from log */ - case 4: /* Read/clear last kernel messages */ - case 5: /* Clear ring buffer */ - default: - rc = task_has_system(current, SYSTEM__SYSLOG_MOD); - break; + case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */ + case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */ + rc = task_has_system(current, SYSTEM__SYSLOG_READ); + break; + case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */ + case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */ + /* Set level of messages printed to console */ + case SYSLOG_ACTION_CONSOLE_LEVEL: + rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); + break; + case SYSLOG_ACTION_CLOSE: /* Close log */ + case SYSLOG_ACTION_OPEN: /* Open log */ + case SYSLOG_ACTION_READ: /* Read from log */ + case SYSLOG_ACTION_READ_CLEAR: /* Read/clear last kernel messages */ + case SYSLOG_ACTION_CLEAR: /* Clear ring buffer */ + default: + rc = task_has_system(current, SYSTEM__SYSLOG_MOD); + break; } return rc; } @@ -1577,366 +2069,303 @@ static int selinux_syslog(int type) * mapping. 0 means there is enough memory for the allocation to * succeed and -ENOMEM implies there is not. * - * Note that secondary_ops->capable and task_has_perm_noaudit return 0 - * if the capability is granted, but __vm_enough_memory requires 1 if - * the capability is granted. - * * Do not audit the selinux permission check, as this is applied to all * processes that allocate mappings. */ -static int selinux_vm_enough_memory(long pages) +static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) { int rc, cap_sys_admin = 0; - struct task_security_struct *tsec = current->security; - - rc = secondary_ops->capable(current, CAP_SYS_ADMIN); - if (rc == 0) - rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, - SECCLASS_CAPABILITY, - CAP_TO_MASK(CAP_SYS_ADMIN), - 0, - NULL); + rc = selinux_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN, + SECURITY_CAP_NOAUDIT); if (rc == 0) cap_sys_admin = 1; - return __vm_enough_memory(pages, cap_sys_admin); + return __vm_enough_memory(mm, pages, cap_sys_admin); } /* binprm security operations */ -static int selinux_bprm_alloc_security(struct linux_binprm *bprm) -{ - struct bprm_security_struct *bsec; - - bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); - if (!bsec) - return -ENOMEM; - - bsec->bprm = bprm; - bsec->sid = SECINITSID_UNLABELED; - bsec->set = 0; - - bprm->security = bsec; - return 0; -} - -static int selinux_bprm_set_security(struct linux_binprm *bprm) +static int selinux_bprm_set_creds(struct linux_binprm *bprm) { - struct task_security_struct *tsec; - struct inode *inode = bprm->file->f_path.dentry->d_inode; + const struct task_security_struct *old_tsec; + struct task_security_struct *new_tsec; struct inode_security_struct *isec; - struct bprm_security_struct *bsec; - u32 newsid; - struct avc_audit_data ad; + struct common_audit_data ad; + struct inode *inode = file_inode(bprm->file); int rc; - rc = secondary_ops->bprm_set_security(bprm); + rc = cap_bprm_set_creds(bprm); if (rc) return rc; - bsec = bprm->security; - - if (bsec->set) + /* SELinux context only depends on initial program or script and not + * the script interpreter */ + if (bprm->cred_prepared) return 0; - tsec = current->security; + old_tsec = current_security(); + new_tsec = bprm->cred->security; isec = inode->i_security; /* Default to the current task SID. */ - bsec->sid = tsec->sid; + new_tsec->sid = old_tsec->sid; + new_tsec->osid = old_tsec->sid; /* Reset fs, key, and sock SIDs on execve. */ - tsec->create_sid = 0; - tsec->keycreate_sid = 0; - tsec->sockcreate_sid = 0; + new_tsec->create_sid = 0; + new_tsec->keycreate_sid = 0; + new_tsec->sockcreate_sid = 0; - if (tsec->exec_sid) { - newsid = tsec->exec_sid; + if (old_tsec->exec_sid) { + new_tsec->sid = old_tsec->exec_sid; /* Reset exec SID on execve. */ - tsec->exec_sid = 0; + new_tsec->exec_sid = 0; + + /* + * Minimize confusion: if no_new_privs or nosuid and a + * transition is explicitly requested, then fail the exec. + */ + if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) + return -EPERM; + if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) + return -EACCES; } else { /* Check for a default transition on this program. */ - rc = security_transition_sid(tsec->sid, isec->sid, - SECCLASS_PROCESS, &newsid); + rc = security_transition_sid(old_tsec->sid, isec->sid, + SECCLASS_PROCESS, NULL, + &new_tsec->sid); if (rc) return rc; } - AVC_AUDIT_DATA_INIT(&ad, FS); - ad.u.fs.mnt = bprm->file->f_path.mnt; - ad.u.fs.dentry = bprm->file->f_path.dentry; + ad.type = LSM_AUDIT_DATA_PATH; + ad.u.path = bprm->file->f_path; - if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) - newsid = tsec->sid; + if ((bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) || + (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)) + new_tsec->sid = old_tsec->sid; - if (tsec->sid == newsid) { - rc = avc_has_perm(tsec->sid, isec->sid, + if (new_tsec->sid == old_tsec->sid) { + rc = avc_has_perm(old_tsec->sid, isec->sid, SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); if (rc) return rc; } else { /* Check permissions for the transition. */ - rc = avc_has_perm(tsec->sid, newsid, + rc = avc_has_perm(old_tsec->sid, new_tsec->sid, SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); if (rc) return rc; - rc = avc_has_perm(newsid, isec->sid, + rc = avc_has_perm(new_tsec->sid, isec->sid, SECCLASS_FILE, FILE__ENTRYPOINT, &ad); if (rc) return rc; - /* Clear any possibly unsafe personality bits on exec: */ - current->personality &= ~PER_CLEAR_ON_SETID; + /* Check for shared state */ + if (bprm->unsafe & LSM_UNSAFE_SHARE) { + rc = avc_has_perm(old_tsec->sid, new_tsec->sid, + SECCLASS_PROCESS, PROCESS__SHARE, + NULL); + if (rc) + return -EPERM; + } + + /* Make sure that anyone attempting to ptrace over a task that + * changes its SID has the appropriate permit */ + if (bprm->unsafe & + (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { + struct task_struct *tracer; + struct task_security_struct *sec; + u32 ptsid = 0; + + rcu_read_lock(); + tracer = ptrace_parent(current); + if (likely(tracer != NULL)) { + sec = __task_cred(tracer)->security; + ptsid = sec->sid; + } + rcu_read_unlock(); + + if (ptsid != 0) { + rc = avc_has_perm(ptsid, new_tsec->sid, + SECCLASS_PROCESS, + PROCESS__PTRACE, NULL); + if (rc) + return -EPERM; + } + } - /* Set the security field to the new SID. */ - bsec->sid = newsid; + /* Clear any possibly unsafe personality bits on exec: */ + bprm->per_clear |= PER_CLEAR_ON_SETID; } - bsec->set = 1; return 0; } -static int selinux_bprm_check_security (struct linux_binprm *bprm) -{ - return secondary_ops->bprm_check_security(bprm); -} - - -static int selinux_bprm_secureexec (struct linux_binprm *bprm) +static int selinux_bprm_secureexec(struct linux_binprm *bprm) { - struct task_security_struct *tsec = current->security; + const struct task_security_struct *tsec = current_security(); + u32 sid, osid; int atsecure = 0; - if (tsec->osid != tsec->sid) { + sid = tsec->sid; + osid = tsec->osid; + + if (osid != sid) { /* Enable secure mode for SIDs transitions unless the noatsecure permission is granted between the two SIDs, i.e. ahp returns 0. */ - atsecure = avc_has_perm(tsec->osid, tsec->sid, - SECCLASS_PROCESS, - PROCESS__NOATSECURE, NULL); + atsecure = avc_has_perm(osid, sid, + SECCLASS_PROCESS, + PROCESS__NOATSECURE, NULL); } - return (atsecure || secondary_ops->bprm_secureexec(bprm)); + return (atsecure || cap_bprm_secureexec(bprm)); } -static void selinux_bprm_free_security(struct linux_binprm *bprm) +static int match_file(const void *p, struct file *file, unsigned fd) { - kfree(bprm->security); - bprm->security = NULL; + return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0; } -extern struct vfsmount *selinuxfs_mount; -extern struct dentry *selinux_null; - /* Derived from fs/exec.c:flush_old_files. */ -static inline void flush_unauthorized_files(struct files_struct * files) +static inline void flush_unauthorized_files(const struct cred *cred, + struct files_struct *files) { - struct avc_audit_data ad; struct file *file, *devnull = NULL; struct tty_struct *tty; - struct fdtable *fdt; - long j = -1; int drop_tty = 0; + unsigned n; - mutex_lock(&tty_mutex); tty = get_current_tty(); if (tty) { - file_list_lock(); - file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list); - if (file) { + spin_lock(&tty_files_lock); + if (!list_empty(&tty->tty_files)) { + struct tty_file_private *file_priv; + /* Revalidate access to controlling tty. - Use inode_has_perm on the tty inode directly rather - than using file_has_perm, as this particular open - file may belong to another process and we are only - interested in the inode-based check here. */ - struct inode *inode = file->f_path.dentry->d_inode; - if (inode_has_perm(current, inode, - FILE__READ | FILE__WRITE, NULL)) { + Use file_path_has_perm on the tty path directly + rather than using file_has_perm, as this particular + open file may belong to another process and we are + only interested in the inode-based check here. */ + file_priv = list_first_entry(&tty->tty_files, + struct tty_file_private, list); + file = file_priv->file; + if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE)) drop_tty = 1; - } } - file_list_unlock(); + spin_unlock(&tty_files_lock); + tty_kref_put(tty); } - mutex_unlock(&tty_mutex); /* Reset controlling tty. */ if (drop_tty) no_tty(); /* Revalidate access to inherited open files. */ + n = iterate_fd(files, 0, match_file, cred); + if (!n) /* none found? */ + return; - AVC_AUDIT_DATA_INIT(&ad,FS); - - spin_lock(&files->file_lock); - for (;;) { - unsigned long set, i; - int fd; - - j++; - i = j * __NFDBITS; - fdt = files_fdtable(files); - if (i >= fdt->max_fds) - break; - set = fdt->open_fds->fds_bits[j]; - if (!set) - continue; - spin_unlock(&files->file_lock); - for ( ; set ; i++,set >>= 1) { - if (set & 1) { - file = fget(i); - if (!file) - continue; - if (file_has_perm(current, - file, - file_to_av(file))) { - sys_close(i); - fd = get_unused_fd(); - if (fd != i) { - if (fd >= 0) - put_unused_fd(fd); - fput(file); - continue; - } - if (devnull) { - get_file(devnull); - } else { - devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); - if (IS_ERR(devnull)) { - devnull = NULL; - put_unused_fd(fd); - fput(file); - continue; - } - } - fd_install(fd, devnull); - } - fput(file); - } - } - spin_lock(&files->file_lock); - - } - spin_unlock(&files->file_lock); + devnull = dentry_open(&selinux_null, O_RDWR, cred); + if (IS_ERR(devnull)) + devnull = NULL; + /* replace all the matching ones with this */ + do { + replace_fd(n - 1, devnull, 0); + } while ((n = iterate_fd(files, n, match_file, cred)) != 0); + if (devnull) + fput(devnull); } -static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) +/* + * Prepare a process for imminent new credential changes due to exec + */ +static void selinux_bprm_committing_creds(struct linux_binprm *bprm) { - struct task_security_struct *tsec; - struct bprm_security_struct *bsec; - u32 sid; - int rc; - - secondary_ops->bprm_apply_creds(bprm, unsafe); - - tsec = current->security; - - bsec = bprm->security; - sid = bsec->sid; + struct task_security_struct *new_tsec; + struct rlimit *rlim, *initrlim; + int rc, i; - tsec->osid = tsec->sid; - bsec->unsafe = 0; - if (tsec->sid != sid) { - /* Check for shared state. If not ok, leave SID - unchanged and kill. */ - if (unsafe & LSM_UNSAFE_SHARE) { - rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, - PROCESS__SHARE, NULL); - if (rc) { - bsec->unsafe = 1; - return; - } - } + new_tsec = bprm->cred->security; + if (new_tsec->sid == new_tsec->osid) + return; - /* Check for ptracing, and update the task SID if ok. - Otherwise, leave SID unchanged and kill. */ - if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { - rc = avc_has_perm(tsec->ptrace_sid, sid, - SECCLASS_PROCESS, PROCESS__PTRACE, - NULL); - if (rc) { - bsec->unsafe = 1; - return; - } + /* Close files for which the new task SID is not authorized. */ + flush_unauthorized_files(bprm->cred, current->files); + + /* Always clear parent death signal on SID transitions. */ + current->pdeath_signal = 0; + + /* Check whether the new SID can inherit resource limits from the old + * SID. If not, reset all soft limits to the lower of the current + * task's hard limit and the init task's soft limit. + * + * Note that the setting of hard limits (even to lower them) can be + * controlled by the setrlimit check. The inclusion of the init task's + * soft limit into the computation is to avoid resetting soft limits + * higher than the default soft limit for cases where the default is + * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. + */ + rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, + PROCESS__RLIMITINH, NULL); + if (rc) { + /* protect against do_prlimit() */ + task_lock(current); + for (i = 0; i < RLIM_NLIMITS; i++) { + rlim = current->signal->rlim + i; + initrlim = init_task.signal->rlim + i; + rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); } - tsec->sid = sid; + task_unlock(current); + update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); } } /* - * called after apply_creds without the task lock held + * Clean up the process immediately after the installation of new credentials + * due to exec */ -static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) +static void selinux_bprm_committed_creds(struct linux_binprm *bprm) { - struct task_security_struct *tsec; - struct rlimit *rlim, *initrlim; + const struct task_security_struct *tsec = current_security(); struct itimerval itimer; - struct bprm_security_struct *bsec; + u32 osid, sid; int rc, i; - tsec = current->security; - bsec = bprm->security; + osid = tsec->osid; + sid = tsec->sid; - if (bsec->unsafe) { - force_sig_specific(SIGKILL, current); - return; - } - if (tsec->osid == tsec->sid) + if (sid == osid) return; - /* Close files for which the new task SID is not authorized. */ - flush_unauthorized_files(current->files); - - /* Check whether the new SID can inherit signal state - from the old SID. If not, clear itimers to avoid - subsequent signal generation and flush and unblock - signals. This must occur _after_ the task SID has - been updated so that any kill done after the flush - will be checked against the new SID. */ - rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, - PROCESS__SIGINH, NULL); + /* Check whether the new SID can inherit signal state from the old SID. + * If not, clear itimers to avoid subsequent signal generation and + * flush and unblock signals. + * + * This must occur _after_ the task SID has been updated so that any + * kill done after the flush will be checked against the new SID. + */ + rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); if (rc) { memset(&itimer, 0, sizeof itimer); for (i = 0; i < 3; i++) do_setitimer(i, &itimer, NULL); - flush_signals(current); spin_lock_irq(¤t->sighand->siglock); - flush_signal_handlers(current, 1); - sigemptyset(¤t->blocked); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } - - /* Check whether the new SID can inherit resource limits - from the old SID. If not, reset all soft limits to - the lower of the current task's hard limit and the init - task's soft limit. Note that the setting of hard limits - (even to lower them) can be controlled by the setrlimit - check. The inclusion of the init task's soft limit into - the computation is to avoid resetting soft limits higher - than the default soft limit for cases where the default - is lower than the hard limit, e.g. RLIMIT_CORE or - RLIMIT_STACK.*/ - rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, - PROCESS__RLIMITINH, NULL); - if (rc) { - for (i = 0; i < RLIM_NLIMITS; i++) { - rlim = current->signal->rlim + i; - initrlim = init_task.signal->rlim+i; - rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur); - } - if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) { - /* - * This will cause RLIMIT_CPU calculations - * to be refigured. - */ - current->it_prof_expires = jiffies_to_cputime(1); + if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) { + __flush_signals(current); + flush_signal_handlers(current, 1); + sigemptyset(¤t->blocked); } + spin_unlock_irq(¤t->sighand->siglock); } - /* Wake up the parent if it is waiting so that it can - recheck wait permission to the new task SID. */ - wake_up_interruptible(¤t->parent->signal->wait_chldexit); + /* Wake up the parent if it is waiting so that it can recheck + * wait permission to the new task SID. */ + read_lock(&tasklist_lock); + __wake_up_parent(current, current->real_parent); + read_unlock(&tasklist_lock); } /* superblock security operations */ @@ -1961,10 +2390,11 @@ static inline int match_prefix(char *prefix, int plen, char *option, int olen) static inline int selinux_option(char *option, int len) { - return (match_prefix("context=", sizeof("context=")-1, option, len) || - match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) || - match_prefix("defcontext=", sizeof("defcontext=")-1, option, len) || - match_prefix("rootcontext=", sizeof("rootcontext=")-1, option, len)); + return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || + match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || + match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || + match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) || + match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len)); } static inline void take_option(char **to, char *from, int *first, int len) @@ -1978,16 +2408,15 @@ static inline void take_option(char **to, char *from, int *first, int len) *to += len; } -static inline void take_selinux_option(char **to, char *from, int *first, - int len) +static inline void take_selinux_option(char **to, char *from, int *first, + int len) { int current_size = 0; if (!*first) { **to = '|'; *to += 1; - } - else + } else *first = 0; while (current_size < len) { @@ -2000,7 +2429,7 @@ static inline void take_selinux_option(char **to, char *from, int *first, } } -static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy) +static int selinux_sb_copy_data(char *orig, char *copy) { int fnosec, fsec, rc = 0; char *in_save, *in_curr, *in_end; @@ -2010,12 +2439,6 @@ static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void in_curr = orig; sec_curr = copy; - /* Binary mount data: just copy */ - if (type->fs_flags & FS_BINARY_MOUNTDATA) { - copy_page(sec_curr, in_curr); - goto out; - } - nosec = (char *)get_zeroed_page(GFP_KERNEL); if (!nosec) { rc = -ENOMEM; @@ -2048,59 +2471,142 @@ out: return rc; } -static int selinux_sb_kern_mount(struct super_block *sb, void *data) +static int selinux_sb_remount(struct super_block *sb, void *data) +{ + int rc, i, *flags; + struct security_mnt_opts opts; + char *secdata, **mount_options; + struct superblock_security_struct *sbsec = sb->s_security; + + if (!(sbsec->flags & SE_SBINITIALIZED)) + return 0; + + if (!data) + return 0; + + if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) + return 0; + + security_init_mnt_opts(&opts); + secdata = alloc_secdata(); + if (!secdata) + return -ENOMEM; + rc = selinux_sb_copy_data(data, secdata); + if (rc) + goto out_free_secdata; + + rc = selinux_parse_opts_str(secdata, &opts); + if (rc) + goto out_free_secdata; + + mount_options = opts.mnt_opts; + flags = opts.mnt_opts_flags; + + for (i = 0; i < opts.num_mnt_opts; i++) { + u32 sid; + size_t len; + + if (flags[i] == SBLABEL_MNT) + continue; + len = strlen(mount_options[i]); + rc = security_context_to_sid(mount_options[i], len, &sid, + GFP_KERNEL); + if (rc) { + printk(KERN_WARNING "SELinux: security_context_to_sid" + "(%s) failed for (dev %s, type %s) errno=%d\n", + mount_options[i], sb->s_id, sb->s_type->name, rc); + goto out_free_opts; + } + rc = -EINVAL; + switch (flags[i]) { + case FSCONTEXT_MNT: + if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid)) + goto out_bad_option; + break; + case CONTEXT_MNT: + if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid)) + goto out_bad_option; + break; + case ROOTCONTEXT_MNT: { + struct inode_security_struct *root_isec; + root_isec = sb->s_root->d_inode->i_security; + + if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid)) + goto out_bad_option; + break; + } + case DEFCONTEXT_MNT: + if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid)) + goto out_bad_option; + break; + default: + goto out_free_opts; + } + } + + rc = 0; +out_free_opts: + security_free_mnt_opts(&opts); +out_free_secdata: + free_secdata(secdata); + return rc; +out_bad_option: + printk(KERN_WARNING "SELinux: unable to change security options " + "during remount (dev %s, type=%s)\n", sb->s_id, + sb->s_type->name); + goto out_free_opts; +} + +static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data) { - struct avc_audit_data ad; + const struct cred *cred = current_cred(); + struct common_audit_data ad; int rc; rc = superblock_doinit(sb, data); if (rc) return rc; - AVC_AUDIT_DATA_INIT(&ad,FS); - ad.u.fs.dentry = sb->s_root; - return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); + /* Allow all mounts performed by the kernel */ + if (flags & MS_KERNMOUNT) + return 0; + + ad.type = LSM_AUDIT_DATA_DENTRY; + ad.u.dentry = sb->s_root; + return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); } static int selinux_sb_statfs(struct dentry *dentry) { - struct avc_audit_data ad; + const struct cred *cred = current_cred(); + struct common_audit_data ad; - AVC_AUDIT_DATA_INIT(&ad,FS); - ad.u.fs.dentry = dentry->d_sb->s_root; - return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); + ad.type = LSM_AUDIT_DATA_DENTRY; + ad.u.dentry = dentry->d_sb->s_root; + return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); } -static int selinux_mount(char * dev_name, - struct nameidata *nd, - char * type, - unsigned long flags, - void * data) +static int selinux_mount(const char *dev_name, + struct path *path, + const char *type, + unsigned long flags, + void *data) { - int rc; - - rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data); - if (rc) - return rc; + const struct cred *cred = current_cred(); if (flags & MS_REMOUNT) - return superblock_has_perm(current, nd->mnt->mnt_sb, - FILESYSTEM__REMOUNT, NULL); + return superblock_has_perm(cred, path->dentry->d_sb, + FILESYSTEM__REMOUNT, NULL); else - return dentry_has_perm(current, nd->mnt, nd->dentry, - FILE__MOUNTON); + return path_has_perm(cred, path, FILE__MOUNTON); } static int selinux_umount(struct vfsmount *mnt, int flags) { - int rc; + const struct cred *cred = current_cred(); - rc = secondary_ops->sb_umount(mnt, flags); - if (rc) - return rc; - - return superblock_has_perm(current,mnt->mnt_sb, - FILESYSTEM__UNMOUNT,NULL); + return superblock_has_perm(cred, mnt->mnt_sb, + FILESYSTEM__UNMOUNT, NULL); } /* inode security operations */ @@ -2115,18 +2621,19 @@ static void selinux_inode_free_security(struct inode *inode) inode_free_security(inode); } -static int selinux_inode_init_security(struct inode *inode, struct inode *dir, - char **name, void **value, - size_t *len) +static int selinux_dentry_init_security(struct dentry *dentry, int mode, + struct qstr *name, void **ctx, + u32 *ctxlen) { + const struct cred *cred = current_cred(); struct task_security_struct *tsec; struct inode_security_struct *dsec; struct superblock_security_struct *sbsec; - u32 newsid, clen; + struct inode *dir = dentry->d_parent->d_inode; + u32 newsid; int rc; - char *namep = NULL, *context; - tsec = current->security; + tsec = cred->security; dsec = dir->i_security; sbsec = dir->i_sb->s_security; @@ -2134,42 +2641,73 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, newsid = tsec->create_sid; } else { rc = security_transition_sid(tsec->sid, dsec->sid, - inode_mode_to_security_class(inode->i_mode), + inode_mode_to_security_class(mode), + name, &newsid); if (rc) { + printk(KERN_WARNING + "%s: security_transition_sid failed, rc=%d\n", + __func__, -rc); + return rc; + } + } + + return security_sid_to_context(newsid, (char **)ctx, ctxlen); +} + +static int selinux_inode_init_security(struct inode *inode, struct inode *dir, + const struct qstr *qstr, + const char **name, + void **value, size_t *len) +{ + const struct task_security_struct *tsec = current_security(); + struct inode_security_struct *dsec; + struct superblock_security_struct *sbsec; + u32 sid, newsid, clen; + int rc; + char *context; + + dsec = dir->i_security; + sbsec = dir->i_sb->s_security; + + sid = tsec->sid; + newsid = tsec->create_sid; + + if ((sbsec->flags & SE_SBINITIALIZED) && + (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) + newsid = sbsec->mntpoint_sid; + else if (!newsid || !(sbsec->flags & SBLABEL_MNT)) { + rc = security_transition_sid(sid, dsec->sid, + inode_mode_to_security_class(inode->i_mode), + qstr, &newsid); + if (rc) { printk(KERN_WARNING "%s: " "security_transition_sid failed, rc=%d (dev=%s " "ino=%ld)\n", - __FUNCTION__, + __func__, -rc, inode->i_sb->s_id, inode->i_ino); return rc; } } /* Possibly defer initialization to selinux_complete_init. */ - if (sbsec->initialized) { + if (sbsec->flags & SE_SBINITIALIZED) { struct inode_security_struct *isec = inode->i_security; isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; isec->initialized = 1; } - if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) + if (!ss_initialized || !(sbsec->flags & SBLABEL_MNT)) return -EOPNOTSUPP; - if (name) { - namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL); - if (!namep) - return -ENOMEM; - *name = namep; - } + if (name) + *name = XATTR_SELINUX_SUFFIX; if (value && len) { - rc = security_sid_to_context(newsid, &context, &clen); - if (rc) { - kfree(namep); + rc = security_sid_to_context_force(newsid, &context, &clen); + if (rc) return rc; - } *value = context; *len = clen; } @@ -2177,28 +2715,18 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, return 0; } -static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) +static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode) { return may_create(dir, dentry, SECCLASS_FILE); } static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) { - int rc; - - rc = secondary_ops->inode_link(old_dentry,dir,new_dentry); - if (rc) - return rc; return may_link(dir, old_dentry, MAY_LINK); } static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) { - int rc; - - rc = secondary_ops->inode_unlink(dir, dentry); - if (rc) - return rc; return may_link(dir, dentry, MAY_UNLINK); } @@ -2207,7 +2735,7 @@ static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const return may_create(dir, dentry, SECCLASS_LNK_FILE); } -static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) +static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask) { return may_create(dir, dentry, SECCLASS_DIR); } @@ -2217,129 +2745,214 @@ static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) return may_link(dir, dentry, MAY_RMDIR); } -static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) +static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) { - int rc; - - rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); - if (rc) - return rc; - return may_create(dir, dentry, inode_mode_to_security_class(mode)); } static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, - struct inode *new_inode, struct dentry *new_dentry) + struct inode *new_inode, struct dentry *new_dentry) { return may_rename(old_inode, old_dentry, new_inode, new_dentry); } static int selinux_inode_readlink(struct dentry *dentry) { - return dentry_has_perm(current, NULL, dentry, FILE__READ); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, dentry, FILE__READ); } static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) { - int rc; + const struct cred *cred = current_cred(); - rc = secondary_ops->inode_follow_link(dentry,nameidata); - if (rc) - return rc; - return dentry_has_perm(current, NULL, dentry, FILE__READ); + return dentry_has_perm(cred, dentry, FILE__READ); } -static int selinux_inode_permission(struct inode *inode, int mask, - struct nameidata *nd) +static noinline int audit_inode_permission(struct inode *inode, + u32 perms, u32 audited, u32 denied, + int result, + unsigned flags) { + struct common_audit_data ad; + struct inode_security_struct *isec = inode->i_security; int rc; - rc = secondary_ops->inode_permission(inode, mask, nd); + ad.type = LSM_AUDIT_DATA_INODE; + ad.u.inode = inode; + + rc = slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms, + audited, denied, result, &ad, flags); if (rc) return rc; + return 0; +} - if (!mask) { - /* No permission to check. Existence test. */ +static int selinux_inode_permission(struct inode *inode, int mask) +{ + const struct cred *cred = current_cred(); + u32 perms; + bool from_access; + unsigned flags = mask & MAY_NOT_BLOCK; + struct inode_security_struct *isec; + u32 sid; + struct av_decision avd; + int rc, rc2; + u32 audited, denied; + + from_access = mask & MAY_ACCESS; + mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); + + /* No permission to check. Existence test. */ + if (!mask) return 0; - } - return inode_has_perm(current, inode, - file_mask_to_av(inode->i_mode, mask), NULL); + validate_creds(cred); + + if (unlikely(IS_PRIVATE(inode))) + return 0; + + perms = file_mask_to_av(inode->i_mode, mask); + + sid = cred_sid(cred); + isec = inode->i_security; + + rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0, &avd); + audited = avc_audit_required(perms, &avd, rc, + from_access ? FILE__AUDIT_ACCESS : 0, + &denied); + if (likely(!audited)) + return rc; + + rc2 = audit_inode_permission(inode, perms, audited, denied, rc, flags); + if (rc2) + return rc2; + return rc; } static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) { - int rc; + const struct cred *cred = current_cred(); + unsigned int ia_valid = iattr->ia_valid; + __u32 av = FILE__WRITE; - rc = secondary_ops->inode_setattr(dentry, iattr); - if (rc) - return rc; + /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */ + if (ia_valid & ATTR_FORCE) { + ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE | + ATTR_FORCE); + if (!ia_valid) + return 0; + } - if (iattr->ia_valid & ATTR_FORCE) - return 0; + if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | + ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET)) + return dentry_has_perm(cred, dentry, FILE__SETATTR); - if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | - ATTR_ATIME_SET | ATTR_MTIME_SET)) - return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); + if (selinux_policycap_openperm && (ia_valid & ATTR_SIZE)) + av |= FILE__OPEN; - return dentry_has_perm(current, NULL, dentry, FILE__WRITE); + return dentry_has_perm(cred, dentry, av); } static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) { - return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); + const struct cred *cred = current_cred(); + struct path path; + + path.dentry = dentry; + path.mnt = mnt; + + return path_has_perm(cred, &path, FILE__GETATTR); } -static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags) +static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) { - struct task_security_struct *tsec = current->security; - struct inode *inode = dentry->d_inode; - struct inode_security_struct *isec = inode->i_security; - struct superblock_security_struct *sbsec; - struct avc_audit_data ad; - u32 newsid; - int rc = 0; + const struct cred *cred = current_cred(); - if (strcmp(name, XATTR_NAME_SELINUX)) { - if (!strncmp(name, XATTR_SECURITY_PREFIX, - sizeof XATTR_SECURITY_PREFIX - 1) && - !capable(CAP_SYS_ADMIN)) { + if (!strncmp(name, XATTR_SECURITY_PREFIX, + sizeof XATTR_SECURITY_PREFIX - 1)) { + if (!strcmp(name, XATTR_NAME_CAPS)) { + if (!capable(CAP_SETFCAP)) + return -EPERM; + } else if (!capable(CAP_SYS_ADMIN)) { /* A different attribute in the security namespace. Restrict to administrator. */ return -EPERM; } - - /* Not an attribute we recognize, so just check the - ordinary setattr permission. */ - return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); } + /* Not an attribute we recognize, so just check the + ordinary setattr permission. */ + return dentry_has_perm(cred, dentry, FILE__SETATTR); +} + +static int selinux_inode_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + struct inode *inode = dentry->d_inode; + struct inode_security_struct *isec = inode->i_security; + struct superblock_security_struct *sbsec; + struct common_audit_data ad; + u32 newsid, sid = current_sid(); + int rc = 0; + + if (strcmp(name, XATTR_NAME_SELINUX)) + return selinux_inode_setotherxattr(dentry, name); + sbsec = inode->i_sb->s_security; - if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) + if (!(sbsec->flags & SBLABEL_MNT)) return -EOPNOTSUPP; - if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) + if (!inode_owner_or_capable(inode)) return -EPERM; - AVC_AUDIT_DATA_INIT(&ad,FS); - ad.u.fs.dentry = dentry; + ad.type = LSM_AUDIT_DATA_DENTRY; + ad.u.dentry = dentry; - rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, + rc = avc_has_perm(sid, isec->sid, isec->sclass, FILE__RELABELFROM, &ad); if (rc) return rc; - rc = security_context_to_sid(value, size, &newsid); + rc = security_context_to_sid(value, size, &newsid, GFP_KERNEL); + if (rc == -EINVAL) { + if (!capable(CAP_MAC_ADMIN)) { + struct audit_buffer *ab; + size_t audit_size; + const char *str; + + /* We strip a nul only if it is at the end, otherwise the + * context contains a nul and we should audit that */ + if (value) { + str = value; + if (str[size - 1] == '\0') + audit_size = size - 1; + else + audit_size = size; + } else { + str = ""; + audit_size = 0; + } + ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR); + audit_log_format(ab, "op=setxattr invalid_context="); + audit_log_n_untrustedstring(ab, value, audit_size); + audit_log_end(ab); + + return rc; + } + rc = security_context_to_sid_force(value, size, &newsid); + } if (rc) return rc; - rc = avc_has_perm(tsec->sid, newsid, isec->sclass, + rc = avc_has_perm(sid, newsid, isec->sclass, FILE__RELABELTO, &ad); if (rc) return rc; - rc = security_validate_transition(isec->sid, newsid, tsec->sid, - isec->sclass); + rc = security_validate_transition(isec->sid, newsid, sid, + isec->sclass); if (rc) return rc; @@ -2350,8 +2963,9 @@ static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value &ad); } -static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, - void *value, size_t size, int flags) +static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, + int flags) { struct inode *inode = dentry->d_inode; struct inode_security_struct *isec = inode->i_security; @@ -2363,73 +2977,90 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, char *name, return; } - rc = security_context_to_sid(value, size, &newsid); + rc = security_context_to_sid_force(value, size, &newsid); if (rc) { - printk(KERN_WARNING "%s: unable to obtain SID for context " - "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc); + printk(KERN_ERR "SELinux: unable to map context to SID" + "for (%s, %lu), rc=%d\n", + inode->i_sb->s_id, inode->i_ino, -rc); return; } + isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; + isec->initialized = 1; + return; } -static int selinux_inode_getxattr (struct dentry *dentry, char *name) +static int selinux_inode_getxattr(struct dentry *dentry, const char *name) { - return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, dentry, FILE__GETATTR); } -static int selinux_inode_listxattr (struct dentry *dentry) +static int selinux_inode_listxattr(struct dentry *dentry) { - return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); + const struct cred *cred = current_cred(); + + return dentry_has_perm(cred, dentry, FILE__GETATTR); } -static int selinux_inode_removexattr (struct dentry *dentry, char *name) +static int selinux_inode_removexattr(struct dentry *dentry, const char *name) { - if (strcmp(name, XATTR_NAME_SELINUX)) { - if (!strncmp(name, XATTR_SECURITY_PREFIX, - sizeof XATTR_SECURITY_PREFIX - 1) && - !capable(CAP_SYS_ADMIN)) { - /* A different attribute in the security namespace. - Restrict to administrator. */ - return -EPERM; - } - - /* Not an attribute we recognize, so just check the - ordinary setattr permission. Might want a separate - permission for removexattr. */ - return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); - } + if (strcmp(name, XATTR_NAME_SELINUX)) + return selinux_inode_setotherxattr(dentry, name); /* No one is allowed to remove a SELinux security label. You can change the label, but all data must be labeled. */ return -EACCES; } -static const char *selinux_inode_xattr_getsuffix(void) -{ - return XATTR_SELINUX_SUFFIX; -} - /* - * Copy the in-core inode security context value to the user. If the - * getxattr() prior to this succeeded, check to see if we need to - * canonicalize the value to be finally returned to the user. + * Copy the inode security context value to the user. * * Permission check is handled by selinux_inode_getxattr hook. */ -static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err) +static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) { + u32 size; + int error; + char *context = NULL; struct inode_security_struct *isec = inode->i_security; if (strcmp(name, XATTR_SELINUX_SUFFIX)) return -EOPNOTSUPP; - return selinux_getsecurity(isec->sid, buffer, size); + /* + * If the caller has CAP_MAC_ADMIN, then get the raw context + * value even if it is not defined by current policy; otherwise, + * use the in-core value under current policy. + * Use the non-auditing forms of the permission checks since + * getxattr may be called by unprivileged processes commonly + * and lack of permission just means that we fall back to the + * in-core context value, not a denial. + */ + error = selinux_capable(current_cred(), &init_user_ns, CAP_MAC_ADMIN, + SECURITY_CAP_NOAUDIT); + if (!error) + error = security_sid_to_context_force(isec->sid, &context, + &size); + else + error = security_sid_to_context(isec->sid, &context, &size); + if (error) + return error; + error = size; + if (alloc) { + *buffer = context; + goto out_nofree; + } + kfree(context); +out_nofree: + return error; } static int selinux_inode_setsecurity(struct inode *inode, const char *name, - const void *value, size_t size, int flags) + const void *value, size_t size, int flags) { struct inode_security_struct *isec = inode->i_security; u32 newsid; @@ -2441,11 +3072,13 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name, if (!value || !size) return -EACCES; - rc = security_context_to_sid((void*)value, size, &newsid); + rc = security_context_to_sid((void *)value, size, &newsid, GFP_KERNEL); if (rc) return rc; + isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; + isec->initialized = 1; return 0; } @@ -2457,28 +3090,44 @@ static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t return len; } +static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) +{ + struct inode_security_struct *isec = inode->i_security; + *secid = isec->sid; +} + /* file security operations */ -static int selinux_file_permission(struct file *file, int mask) +static int selinux_revalidate_file_permission(struct file *file, int mask) { - int rc; - struct inode *inode = file->f_path.dentry->d_inode; - - if (!mask) { - /* No permission to check. Existence test. */ - return 0; - } + const struct cred *cred = current_cred(); + struct inode *inode = file_inode(file); /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) mask |= MAY_APPEND; - rc = file_has_perm(current, file, - file_mask_to_av(inode->i_mode, mask)); - if (rc) - return rc; + return file_has_perm(cred, file, + file_mask_to_av(inode->i_mode, mask)); +} + +static int selinux_file_permission(struct file *file, int mask) +{ + struct inode *inode = file_inode(file); + struct file_security_struct *fsec = file->f_security; + struct inode_security_struct *isec = inode->i_security; + u32 sid = current_sid(); + + if (!mask) + /* No permission to check. Existence test. */ + return 0; + + if (sid == fsec->sid && fsec->isid == isec->sid && + fsec->pseqno == avc_policy_seqno()) + /* No change since file_open check. */ + return 0; - return selinux_netlbl_inode_permission(inode, mask); + return selinux_revalidate_file_permission(file, mask); } static int selinux_file_alloc_security(struct file *file) @@ -2494,63 +3143,68 @@ static void selinux_file_free_security(struct file *file) static int selinux_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { + const struct cred *cred = current_cred(); int error = 0; switch (cmd) { - case FIONREAD: - /* fall through */ - case FIBMAP: - /* fall through */ - case FIGETBSZ: - /* fall through */ - case EXT2_IOC_GETFLAGS: - /* fall through */ - case EXT2_IOC_GETVERSION: - error = file_has_perm(current, file, FILE__GETATTR); - break; - - case EXT2_IOC_SETFLAGS: - /* fall through */ - case EXT2_IOC_SETVERSION: - error = file_has_perm(current, file, FILE__SETATTR); - break; + case FIONREAD: + /* fall through */ + case FIBMAP: + /* fall through */ + case FIGETBSZ: + /* fall through */ + case FS_IOC_GETFLAGS: + /* fall through */ + case FS_IOC_GETVERSION: + error = file_has_perm(cred, file, FILE__GETATTR); + break; - /* sys_ioctl() checks */ - case FIONBIO: - /* fall through */ - case FIOASYNC: - error = file_has_perm(current, file, 0); - break; + case FS_IOC_SETFLAGS: + /* fall through */ + case FS_IOC_SETVERSION: + error = file_has_perm(cred, file, FILE__SETATTR); + break; - case KDSKBENT: - case KDSKBSENT: - error = task_has_capability(current,CAP_SYS_TTY_CONFIG); - break; + /* sys_ioctl() checks */ + case FIONBIO: + /* fall through */ + case FIOASYNC: + error = file_has_perm(cred, file, 0); + break; - /* default case assumes that the command will go - * to the file's ioctl() function. - */ - default: - error = file_has_perm(current, file, FILE__IOCTL); + case KDSKBENT: + case KDSKBSENT: + error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG, + SECURITY_CAP_AUDIT); + break; + /* default case assumes that the command will go + * to the file's ioctl() function. + */ + default: + error = file_has_perm(cred, file, FILE__IOCTL); } return error; } +static int default_noexec; + static int file_map_prot_check(struct file *file, unsigned long prot, int shared) { -#ifndef CONFIG_PPC32 - if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { + const struct cred *cred = current_cred(); + int rc = 0; + + if (default_noexec && + (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { /* * We are making executable an anonymous mapping or a * private file mapping that will also be writable. * This has an additional check. */ - int rc = task_has_perm(current, current, PROCESS__EXECMEM); + rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); if (rc) - return rc; + goto error; } -#endif if (file) { /* read access is always possible with a mapping */ @@ -2563,24 +3217,34 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared if (prot & PROT_EXEC) av |= FILE__EXECUTE; - return file_has_perm(current, file, av); + return file_has_perm(cred, file, av); } - return 0; + +error: + return rc; } -static int selinux_file_mmap(struct file *file, unsigned long reqprot, - unsigned long prot, unsigned long flags, - unsigned long addr, unsigned long addr_only) +static int selinux_mmap_addr(unsigned long addr) { - int rc = 0; - u32 sid = ((struct task_security_struct*)(current->security))->sid; + int rc; + + /* do DAC check on address space usage */ + rc = cap_mmap_addr(addr); + if (rc) + return rc; - if (addr < mmap_min_addr) + if (addr < CONFIG_LSM_MMAP_MIN_ADDR) { + u32 sid = current_sid(); rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, MEMPROTECT__MMAP_ZERO, NULL); - if (rc || addr_only) - return rc; + } + + return rc; +} +static int selinux_mmap_file(struct file *file, unsigned long reqprot, + unsigned long prot, unsigned long flags) +{ if (selinux_checkreqprot) prot = reqprot; @@ -2592,26 +3256,21 @@ static int selinux_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, unsigned long prot) { - int rc; - - rc = secondary_ops->file_mprotect(vma, reqprot, prot); - if (rc) - return rc; + const struct cred *cred = current_cred(); if (selinux_checkreqprot) prot = reqprot; -#ifndef CONFIG_PPC32 - if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { - rc = 0; + if (default_noexec && + (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { + int rc = 0; if (vma->vm_start >= vma->vm_mm->start_brk && vma->vm_end <= vma->vm_mm->brk) { - rc = task_has_perm(current, current, - PROCESS__EXECHEAP); + rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); } else if (!vma->vm_file && vma->vm_start <= vma->vm_mm->start_stack && vma->vm_end >= vma->vm_mm->start_stack) { - rc = task_has_perm(current, current, PROCESS__EXECSTACK); + rc = current_has_perm(current, PROCESS__EXECSTACK); } else if (vma->vm_file && vma->anon_vma) { /* * We are making executable a file mapping that has @@ -2620,61 +3279,57 @@ static int selinux_file_mprotect(struct vm_area_struct *vma, * modified content. This typically should only * occur for text relocations. */ - rc = file_has_perm(current, vma->vm_file, - FILE__EXECMOD); + rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); } if (rc) return rc; } -#endif return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); } static int selinux_file_lock(struct file *file, unsigned int cmd) { - return file_has_perm(current, file, FILE__LOCK); + const struct cred *cred = current_cred(); + + return file_has_perm(cred, file, FILE__LOCK); } static int selinux_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) { + const struct cred *cred = current_cred(); int err = 0; switch (cmd) { - case F_SETFL: - if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { - err = -EINVAL; - break; - } - - if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { - err = file_has_perm(current, file,FILE__WRITE); - break; - } - /* fall through */ - case F_SETOWN: - case F_SETSIG: - case F_GETFL: - case F_GETOWN: - case F_GETSIG: - /* Just check FD__USE permission */ - err = file_has_perm(current, file, 0); + case F_SETFL: + if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { + err = file_has_perm(cred, file, FILE__WRITE); break; - case F_GETLK: - case F_SETLK: - case F_SETLKW: + } + /* fall through */ + case F_SETOWN: + case F_SETSIG: + case F_GETFL: + case F_GETOWN: + case F_GETSIG: + case F_GETOWNER_UIDS: + /* Just check FD__USE permission */ + err = file_has_perm(cred, file, 0); + break; + case F_GETLK: + case F_SETLK: + case F_SETLKW: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: #if BITS_PER_LONG == 32 - case F_GETLK64: - case F_SETLK64: - case F_SETLKW64: + case F_GETLK64: + case F_SETLK64: + case F_SETLKW64: #endif - if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { - err = -EINVAL; - break; - } - err = file_has_perm(current, file, FILE__LOCK); - break; + err = file_has_perm(cred, file, FILE__LOCK); + break; } return err; @@ -2682,12 +3337,10 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd, static int selinux_file_set_fowner(struct file *file) { - struct task_security_struct *tsec; struct file_security_struct *fsec; - tsec = current->security; fsec = file->f_security; - fsec->fown_sid = tsec->sid; + fsec->fown_sid = current_sid(); return 0; } @@ -2695,15 +3348,14 @@ static int selinux_file_set_fowner(struct file *file) static int selinux_file_send_sigiotask(struct task_struct *tsk, struct fown_struct *fown, int signum) { - struct file *file; + struct file *file; + u32 sid = task_sid(tsk); u32 perm; - struct task_security_struct *tsec; struct file_security_struct *fsec; /* struct fown_struct is never outside the context of a struct file */ - file = container_of(fown, struct file, f_owner); + file = container_of(fown, struct file, f_owner); - tsec = tsk->security; fsec = file->f_security; if (!signum) @@ -2711,163 +3363,251 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk, else perm = signal_to_av(signum); - return avc_has_perm(fsec->fown_sid, tsec->sid, + return avc_has_perm(fsec->fown_sid, sid, SECCLASS_PROCESS, perm, NULL); } static int selinux_file_receive(struct file *file) { - return file_has_perm(current, file, file_to_av(file)); + const struct cred *cred = current_cred(); + + return file_has_perm(cred, file, file_to_av(file)); +} + +static int selinux_file_open(struct file *file, const struct cred *cred) +{ + struct file_security_struct *fsec; + struct inode_security_struct *isec; + + fsec = file->f_security; + isec = file_inode(file)->i_security; + /* + * Save inode label and policy sequence number + * at open-time so that selinux_file_permission + * can determine whether revalidation is necessary. + * Task label is already saved in the file security + * struct as its SID. + */ + fsec->isid = isec->sid; + fsec->pseqno = avc_policy_seqno(); + /* + * Since the inode label or policy seqno may have changed + * between the selinux_inode_permission check and the saving + * of state above, recheck that access is still permitted. + * Otherwise, access might never be revalidated against the + * new inode label or new policy. + * This check is not redundant - do not remove. + */ + return file_path_has_perm(cred, file, open_file_to_av(file)); } /* task security operations */ static int selinux_task_create(unsigned long clone_flags) { - int rc; + return current_has_perm(current, PROCESS__FORK); +} - rc = secondary_ops->task_create(clone_flags); - if (rc) - return rc; +/* + * allocate the SELinux part of blank credentials + */ +static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) +{ + struct task_security_struct *tsec; + + tsec = kzalloc(sizeof(struct task_security_struct), gfp); + if (!tsec) + return -ENOMEM; - return task_has_perm(current, current, PROCESS__FORK); + cred->security = tsec; + return 0; } -static int selinux_task_alloc_security(struct task_struct *tsk) +/* + * detach and free the LSM part of a set of credentials + */ +static void selinux_cred_free(struct cred *cred) { - struct task_security_struct *tsec1, *tsec2; - int rc; - - tsec1 = current->security; + struct task_security_struct *tsec = cred->security; - rc = task_alloc_security(tsk); - if (rc) - return rc; - tsec2 = tsk->security; + /* + * cred->security == NULL if security_cred_alloc_blank() or + * security_prepare_creds() returned an error. + */ + BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE); + cred->security = (void *) 0x7UL; + kfree(tsec); +} - tsec2->osid = tsec1->osid; - tsec2->sid = tsec1->sid; +/* + * prepare a new set of credentials for modification + */ +static int selinux_cred_prepare(struct cred *new, const struct cred *old, + gfp_t gfp) +{ + const struct task_security_struct *old_tsec; + struct task_security_struct *tsec; - /* Retain the exec, fs, key, and sock SIDs across fork */ - tsec2->exec_sid = tsec1->exec_sid; - tsec2->create_sid = tsec1->create_sid; - tsec2->keycreate_sid = tsec1->keycreate_sid; - tsec2->sockcreate_sid = tsec1->sockcreate_sid; + old_tsec = old->security; - /* Retain ptracer SID across fork, if any. - This will be reset by the ptrace hook upon any - subsequent ptrace_attach operations. */ - tsec2->ptrace_sid = tsec1->ptrace_sid; + tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); + if (!tsec) + return -ENOMEM; + new->security = tsec; return 0; } -static void selinux_task_free_security(struct task_struct *tsk) +/* + * transfer the SELinux data to a blank set of creds + */ +static void selinux_cred_transfer(struct cred *new, const struct cred *old) { - task_free_security(tsk); + const struct task_security_struct *old_tsec = old->security; + struct task_security_struct *tsec = new->security; + + *tsec = *old_tsec; } -static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) -{ - /* Since setuid only affects the current process, and - since the SELinux controls are not based on the Linux - identity attributes, SELinux does not need to control - this operation. However, SELinux does control the use - of the CAP_SETUID and CAP_SETGID capabilities using the - capable hook. */ - return 0; +/* + * set the security data for a kernel service + * - all the creation contexts are set to unlabelled + */ +static int selinux_kernel_act_as(struct cred *new, u32 secid) +{ + struct task_security_struct *tsec = new->security; + u32 sid = current_sid(); + int ret; + + ret = avc_has_perm(sid, secid, + SECCLASS_KERNEL_SERVICE, + KERNEL_SERVICE__USE_AS_OVERRIDE, + NULL); + if (ret == 0) { + tsec->sid = secid; + tsec->create_sid = 0; + tsec->keycreate_sid = 0; + tsec->sockcreate_sid = 0; + } + return ret; } -static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) +/* + * set the file creation context in a security record to the same as the + * objective context of the specified inode + */ +static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) { - return secondary_ops->task_post_setuid(id0,id1,id2,flags); + struct inode_security_struct *isec = inode->i_security; + struct task_security_struct *tsec = new->security; + u32 sid = current_sid(); + int ret; + + ret = avc_has_perm(sid, isec->sid, + SECCLASS_KERNEL_SERVICE, + KERNEL_SERVICE__CREATE_FILES_AS, + NULL); + + if (ret == 0) + tsec->create_sid = isec->sid; + return ret; } -static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) +static int selinux_kernel_module_request(char *kmod_name) { - /* See the comment for setuid above. */ - return 0; + u32 sid; + struct common_audit_data ad; + + sid = task_sid(current); + + ad.type = LSM_AUDIT_DATA_KMOD; + ad.u.kmod_name = kmod_name; + + return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, + SYSTEM__MODULE_REQUEST, &ad); } static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) { - return task_has_perm(current, p, PROCESS__SETPGID); + return current_has_perm(p, PROCESS__SETPGID); } static int selinux_task_getpgid(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETPGID); + return current_has_perm(p, PROCESS__GETPGID); } static int selinux_task_getsid(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETSESSION); + return current_has_perm(p, PROCESS__GETSESSION); } static void selinux_task_getsecid(struct task_struct *p, u32 *secid) { - selinux_get_task_sid(p, secid); -} - -static int selinux_task_setgroups(struct group_info *group_info) -{ - /* See the comment for setuid above. */ - return 0; + *secid = task_sid(p); } static int selinux_task_setnice(struct task_struct *p, int nice) { int rc; - rc = secondary_ops->task_setnice(p, nice); + rc = cap_task_setnice(p, nice); if (rc) return rc; - return task_has_perm(current,p, PROCESS__SETSCHED); + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_setioprio(struct task_struct *p, int ioprio) { - return task_has_perm(current, p, PROCESS__SETSCHED); + int rc; + + rc = cap_task_setioprio(p, ioprio); + if (rc) + return rc; + + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_getioprio(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETSCHED); + return current_has_perm(p, PROCESS__GETSCHED); } -static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) +static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource, + struct rlimit *new_rlim) { - struct rlimit *old_rlim = current->signal->rlim + resource; - int rc; - - rc = secondary_ops->task_setrlimit(resource, new_rlim); - if (rc) - return rc; + struct rlimit *old_rlim = p->signal->rlim + resource; /* Control the ability to change the hard limit (whether lowering or raising it), so that the hard limit can later be used as a safe reset point for the soft limit - upon context transitions. See selinux_bprm_apply_creds. */ + upon context transitions. See selinux_bprm_committing_creds. */ if (old_rlim->rlim_max != new_rlim->rlim_max) - return task_has_perm(current, current, PROCESS__SETRLIMIT); + return current_has_perm(p, PROCESS__SETRLIMIT); return 0; } -static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp) +static int selinux_task_setscheduler(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__SETSCHED); + int rc; + + rc = cap_task_setscheduler(p); + if (rc) + return rc; + + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_getscheduler(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__GETSCHED); + return current_has_perm(p, PROCESS__GETSCHED); } static int selinux_task_movememory(struct task_struct *p) { - return task_has_perm(current, p, PROCESS__SETSCHED); + return current_has_perm(p, PROCESS__SETSCHED); } static int selinux_task_kill(struct task_struct *p, struct siginfo *info, @@ -2875,74 +3615,37 @@ static int selinux_task_kill(struct task_struct *p, struct siginfo *info, { u32 perm; int rc; - struct task_security_struct *tsec; - - rc = secondary_ops->task_kill(p, info, sig, secid); - if (rc) - return rc; - - if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info))) - return 0; if (!sig) perm = PROCESS__SIGNULL; /* null signal; existence test */ else perm = signal_to_av(sig); - tsec = p->security; if (secid) - rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL); + rc = avc_has_perm(secid, task_sid(p), + SECCLASS_PROCESS, perm, NULL); else - rc = task_has_perm(current, p, perm); + rc = current_has_perm(p, perm); return rc; } -static int selinux_task_prctl(int option, - unsigned long arg2, - unsigned long arg3, - unsigned long arg4, - unsigned long arg5) -{ - /* The current prctl operations do not appear to require - any SELinux controls since they merely observe or modify - the state of the current process. */ - return 0; -} - static int selinux_task_wait(struct task_struct *p) { - u32 perm; - - perm = signal_to_av(p->exit_signal); - - return task_has_perm(p, current, perm); -} - -static void selinux_task_reparent_to_init(struct task_struct *p) -{ - struct task_security_struct *tsec; - - secondary_ops->task_reparent_to_init(p); - - tsec = p->security; - tsec->osid = tsec->sid; - tsec->sid = SECINITSID_KERNEL; - return; + return task_has_perm(p, current, PROCESS__SIGCHLD); } static void selinux_task_to_inode(struct task_struct *p, struct inode *inode) { - struct task_security_struct *tsec = p->security; struct inode_security_struct *isec = inode->i_security; + u32 sid = task_sid(p); - isec->sid = tsec->sid; + isec->sid = sid; isec->initialized = 1; - return; } /* Returns error only if unable to parse addresses */ static int selinux_parse_skb_ipv4(struct sk_buff *skb, - struct avc_audit_data *ad, u8 *proto) + struct common_audit_data *ad, u8 *proto) { int offset, ihlen, ret = -EINVAL; struct iphdr _iph, *ih; @@ -2956,45 +3659,45 @@ static int selinux_parse_skb_ipv4(struct sk_buff *skb, if (ihlen < sizeof(_iph)) goto out; - ad->u.net.v4info.saddr = ih->saddr; - ad->u.net.v4info.daddr = ih->daddr; + ad->u.net->v4info.saddr = ih->saddr; + ad->u.net->v4info.daddr = ih->daddr; ret = 0; if (proto) *proto = ih->protocol; switch (ih->protocol) { - case IPPROTO_TCP: { - struct tcphdr _tcph, *th; + case IPPROTO_TCP: { + struct tcphdr _tcph, *th; - if (ntohs(ih->frag_off) & IP_OFFSET) - break; + if (ntohs(ih->frag_off) & IP_OFFSET) + break; offset += ihlen; th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); if (th == NULL) break; - ad->u.net.sport = th->source; - ad->u.net.dport = th->dest; + ad->u.net->sport = th->source; + ad->u.net->dport = th->dest; break; - } - - case IPPROTO_UDP: { - struct udphdr _udph, *uh; - - if (ntohs(ih->frag_off) & IP_OFFSET) - break; - + } + + case IPPROTO_UDP: { + struct udphdr _udph, *uh; + + if (ntohs(ih->frag_off) & IP_OFFSET) + break; + offset += ihlen; - uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); + uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); if (uh == NULL) - break; + break; - ad->u.net.sport = uh->source; - ad->u.net.dport = uh->dest; - break; - } + ad->u.net->sport = uh->source; + ad->u.net->dport = uh->dest; + break; + } case IPPROTO_DCCP: { struct dccp_hdr _dccph, *dh; @@ -3007,14 +3710,14 @@ static int selinux_parse_skb_ipv4(struct sk_buff *skb, if (dh == NULL) break; - ad->u.net.sport = dh->dccph_sport; - ad->u.net.dport = dh->dccph_dport; + ad->u.net->sport = dh->dccph_sport; + ad->u.net->dport = dh->dccph_dport; break; - } + } - default: - break; - } + default: + break; + } out: return ret; } @@ -3023,24 +3726,25 @@ out: /* Returns error only if unable to parse addresses */ static int selinux_parse_skb_ipv6(struct sk_buff *skb, - struct avc_audit_data *ad, u8 *proto) + struct common_audit_data *ad, u8 *proto) { u8 nexthdr; int ret = -EINVAL, offset; struct ipv6hdr _ipv6h, *ip6; + __be16 frag_off; offset = skb_network_offset(skb); ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); if (ip6 == NULL) goto out; - ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); - ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); + ad->u.net->v6info.saddr = ip6->saddr; + ad->u.net->v6info.daddr = ip6->daddr; ret = 0; nexthdr = ip6->nexthdr; offset += sizeof(_ipv6h); - offset = ipv6_skip_exthdr(skb, offset, &nexthdr); + offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); if (offset < 0) goto out; @@ -3049,14 +3753,14 @@ static int selinux_parse_skb_ipv6(struct sk_buff *skb, switch (nexthdr) { case IPPROTO_TCP: { - struct tcphdr _tcph, *th; + struct tcphdr _tcph, *th; th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); if (th == NULL) break; - ad->u.net.sport = th->source; - ad->u.net.dport = th->dest; + ad->u.net->sport = th->source; + ad->u.net->dport = th->dest; break; } @@ -3067,8 +3771,8 @@ static int selinux_parse_skb_ipv6(struct sk_buff *skb, if (uh == NULL) break; - ad->u.net.sport = uh->source; - ad->u.net.dport = uh->dest; + ad->u.net->sport = uh->source; + ad->u.net->dport = uh->dest; break; } @@ -3079,10 +3783,10 @@ static int selinux_parse_skb_ipv6(struct sk_buff *skb, if (dh == NULL) break; - ad->u.net.sport = dh->dccph_sport; - ad->u.net.dport = dh->dccph_dport; + ad->u.net->sport = dh->dccph_sport; + ad->u.net->dport = dh->dccph_dport; break; - } + } /* includes fragments */ default: @@ -3094,131 +3798,186 @@ out: #endif /* IPV6 */ -static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, - char **addrp, int *len, int src, u8 *proto) +static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad, + char **_addrp, int src, u8 *proto) { - int ret = 0; + char *addrp; + int ret; - switch (ad->u.net.family) { + switch (ad->u.net->family) { case PF_INET: ret = selinux_parse_skb_ipv4(skb, ad, proto); - if (ret || !addrp) - break; - *len = 4; - *addrp = (char *)(src ? &ad->u.net.v4info.saddr : - &ad->u.net.v4info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net->v4info.saddr : + &ad->u.net->v4info.daddr); + goto okay; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) case PF_INET6: ret = selinux_parse_skb_ipv6(skb, ad, proto); - if (ret || !addrp) - break; - *len = 16; - *addrp = (char *)(src ? &ad->u.net.v6info.saddr : - &ad->u.net.v6info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net->v6info.saddr : + &ad->u.net->v6info.daddr); + goto okay; #endif /* IPV6 */ default: - break; + addrp = NULL; + goto okay; } +parse_error: + printk(KERN_WARNING + "SELinux: failure in selinux_parse_skb()," + " unable to parse packet\n"); return ret; + +okay: + if (_addrp) + *_addrp = addrp; + return 0; } /** - * selinux_skb_extlbl_sid - Determine the external label of a packet + * selinux_skb_peerlbl_sid - Determine the peer label of a packet * @skb: the packet - * @sid: the packet's SID + * @family: protocol family + * @sid: the packet's peer label SID * * Description: - * Check the various different forms of external packet labeling and determine - * the external SID for the packet. If only one form of external labeling is - * present then it is used, if both labeled IPsec and NetLabel labels are - * present then the SELinux type information is taken from the labeled IPsec - * SA and the MLS sensitivity label information is taken from the NetLabel - * security attributes. This bit of "magic" is done in the call to - * selinux_netlbl_skbuff_getsid(). + * Check the various different forms of network peer labeling and determine + * the peer label/SID for the packet; most of the magic actually occurs in + * the security server function security_net_peersid_cmp(). The function + * returns zero if the value in @sid is valid (although it may be SECSID_NULL) + * or -EACCES if @sid is invalid due to inconsistencies with the different + * peer labels. * */ -static void selinux_skb_extlbl_sid(struct sk_buff *skb, u32 *sid) +static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid) { + int err; u32 xfrm_sid; u32 nlbl_sid; + u32 nlbl_type; - selinux_skb_xfrm_sid(skb, &xfrm_sid); - if (selinux_netlbl_skbuff_getsid(skb, - (xfrm_sid == SECSID_NULL ? - SECINITSID_NETMSG : xfrm_sid), - &nlbl_sid) != 0) - nlbl_sid = SECSID_NULL; - *sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid); + err = selinux_xfrm_skb_sid(skb, &xfrm_sid); + if (unlikely(err)) + return -EACCES; + err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); + if (unlikely(err)) + return -EACCES; + + err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); + if (unlikely(err)) { + printk(KERN_WARNING + "SELinux: failure in selinux_skb_peerlbl_sid()," + " unable to determine packet's peer label\n"); + return -EACCES; + } + + return 0; } -/* socket security operations */ -static int socket_has_perm(struct task_struct *task, struct socket *sock, - u32 perms) +/** + * selinux_conn_sid - Determine the child socket label for a connection + * @sk_sid: the parent socket's SID + * @skb_sid: the packet's SID + * @conn_sid: the resulting connection SID + * + * If @skb_sid is valid then the user:role:type information from @sk_sid is + * combined with the MLS information from @skb_sid in order to create + * @conn_sid. If @skb_sid is not valid then then @conn_sid is simply a copy + * of @sk_sid. Returns zero on success, negative values on failure. + * + */ +static int selinux_conn_sid(u32 sk_sid, u32 skb_sid, u32 *conn_sid) { - struct inode_security_struct *isec; - struct task_security_struct *tsec; - struct avc_audit_data ad; int err = 0; - tsec = task->security; - isec = SOCK_INODE(sock)->i_security; + if (skb_sid != SECSID_NULL) + err = security_sid_mls_copy(sk_sid, skb_sid, conn_sid); + else + *conn_sid = sk_sid; - if (isec->sid == SECINITSID_KERNEL) - goto out; + return err; +} - AVC_AUDIT_DATA_INIT(&ad,NET); - ad.u.net.sk = sock->sk; - err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); +/* socket security operations */ -out: - return err; +static int socket_sockcreate_sid(const struct task_security_struct *tsec, + u16 secclass, u32 *socksid) +{ + if (tsec->sockcreate_sid > SECSID_NULL) { + *socksid = tsec->sockcreate_sid; + return 0; + } + + return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL, + socksid); +} + +static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms) +{ + struct sk_security_struct *sksec = sk->sk_security; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; + u32 tsid = task_sid(task); + + if (sksec->sid == SECINITSID_KERNEL) + return 0; + + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->sk = sk; + + return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad); } static int selinux_socket_create(int family, int type, int protocol, int kern) { - int err = 0; - struct task_security_struct *tsec; + const struct task_security_struct *tsec = current_security(); u32 newsid; + u16 secclass; + int rc; if (kern) - goto out; + return 0; - tsec = current->security; - newsid = tsec->sockcreate_sid ? : tsec->sid; - err = avc_has_perm(tsec->sid, newsid, - socket_type_to_security_class(family, type, - protocol), SOCKET__CREATE, NULL); + secclass = socket_type_to_security_class(family, type, protocol); + rc = socket_sockcreate_sid(tsec, secclass, &newsid); + if (rc) + return rc; -out: - return err; + return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL); } static int selinux_socket_post_create(struct socket *sock, int family, int type, int protocol, int kern) { - int err = 0; - struct inode_security_struct *isec; - struct task_security_struct *tsec; + const struct task_security_struct *tsec = current_security(); + struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; struct sk_security_struct *sksec; - u32 newsid; - - isec = SOCK_INODE(sock)->i_security; + int err = 0; - tsec = current->security; - newsid = tsec->sockcreate_sid ? : tsec->sid; isec->sclass = socket_type_to_security_class(family, type, protocol); - isec->sid = kern ? SECINITSID_KERNEL : newsid; + + if (kern) + isec->sid = SECINITSID_KERNEL; + else { + err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid)); + if (err) + return err; + } + isec->initialized = 1; if (sock->sk) { sksec = sock->sk->sk_security; sksec->sid = isec->sid; - err = selinux_netlbl_socket_post_create(sock); + sksec->sclass = isec->sclass; + err = selinux_netlbl_socket_post_create(sock->sk, family); } return err; @@ -3227,15 +3986,14 @@ static int selinux_socket_post_create(struct socket *sock, int family, /* Range of port numbers used to automatically bind. Need to determine whether we should perform a name_bind permission check between the socket and the port number. */ -#define ip_local_port_range_0 sysctl_local_port_range[0] -#define ip_local_port_range_1 sysctl_local_port_range[1] static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) { + struct sock *sk = sock->sk; u16 family; int err; - err = socket_has_perm(current, sock, SOCKET__BIND); + err = sock_has_perm(current, sk, SOCKET__BIND); if (err) goto out; @@ -3244,54 +4002,54 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in * Multiple address binding for SCTP is not supported yet: we just * check the first address now. */ - family = sock->sk->sk_family; + family = sk->sk_family; if (family == PF_INET || family == PF_INET6) { char *addrp; - struct inode_security_struct *isec; - struct task_security_struct *tsec; - struct avc_audit_data ad; + struct sk_security_struct *sksec = sk->sk_security; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; struct sockaddr_in *addr4 = NULL; struct sockaddr_in6 *addr6 = NULL; unsigned short snum; - struct sock *sk = sock->sk; - u32 sid, node_perm, addrlen; - - tsec = current->security; - isec = SOCK_INODE(sock)->i_security; + u32 sid, node_perm; if (family == PF_INET) { addr4 = (struct sockaddr_in *)address; snum = ntohs(addr4->sin_port); - addrlen = sizeof(addr4->sin_addr.s_addr); addrp = (char *)&addr4->sin_addr.s_addr; } else { addr6 = (struct sockaddr_in6 *)address; snum = ntohs(addr6->sin6_port); - addrlen = sizeof(addr6->sin6_addr.s6_addr); addrp = (char *)&addr6->sin6_addr.s6_addr; } - if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) || - snum > ip_local_port_range_1)) { - err = security_port_sid(sk->sk_family, sk->sk_type, - sk->sk_protocol, snum, &sid); - if (err) - goto out; - AVC_AUDIT_DATA_INIT(&ad,NET); - ad.u.net.sport = htons(snum); - ad.u.net.family = family; - err = avc_has_perm(isec->sid, sid, - isec->sclass, - SOCKET__NAME_BIND, &ad); - if (err) - goto out; + if (snum) { + int low, high; + + inet_get_local_port_range(sock_net(sk), &low, &high); + + if (snum < max(PROT_SOCK, low) || snum > high) { + err = sel_netport_sid(sk->sk_protocol, + snum, &sid); + if (err) + goto out; + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->sport = htons(snum); + ad.u.net->family = family; + err = avc_has_perm(sksec->sid, sid, + sksec->sclass, + SOCKET__NAME_BIND, &ad); + if (err) + goto out; + } } - - switch(isec->sclass) { + + switch (sksec->sclass) { case SECCLASS_TCP_SOCKET: node_perm = TCP_SOCKET__NODE_BIND; break; - + case SECCLASS_UDP_SOCKET: node_perm = UDP_SOCKET__NODE_BIND; break; @@ -3304,22 +4062,23 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in node_perm = RAWIP_SOCKET__NODE_BIND; break; } - - err = security_node_sid(family, addrp, addrlen, &sid); + + err = sel_netnode_sid(addrp, family, &sid); if (err) goto out; - - AVC_AUDIT_DATA_INIT(&ad,NET); - ad.u.net.sport = htons(snum); - ad.u.net.family = family; + + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->sport = htons(snum); + ad.u.net->family = family; if (family == PF_INET) - ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; + ad.u.net->v4info.saddr = addr4->sin_addr.s_addr; else - ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); + ad.u.net->v6info.saddr = addr6->sin6_addr; - err = avc_has_perm(isec->sid, sid, - isec->sclass, node_perm, &ad); + err = avc_has_perm(sksec->sid, sid, + sksec->sclass, node_perm, &ad); if (err) goto out; } @@ -3329,21 +4088,21 @@ out: static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) { - struct inode_security_struct *isec; + struct sock *sk = sock->sk; + struct sk_security_struct *sksec = sk->sk_security; int err; - err = socket_has_perm(current, sock, SOCKET__CONNECT); + err = sock_has_perm(current, sk, SOCKET__CONNECT); if (err) return err; /* * If a TCP or DCCP socket, check name_connect permission for the port. */ - isec = SOCK_INODE(sock)->i_security; - if (isec->sclass == SECCLASS_TCP_SOCKET || - isec->sclass == SECCLASS_DCCP_SOCKET) { - struct sock *sk = sock->sk; - struct avc_audit_data ad; + if (sksec->sclass == SECCLASS_TCP_SOCKET || + sksec->sclass == SECCLASS_DCCP_SOCKET) { + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; struct sockaddr_in *addr4 = NULL; struct sockaddr_in6 *addr6 = NULL; unsigned short snum; @@ -3361,29 +4120,31 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, snum = ntohs(addr6->sin6_port); } - err = security_port_sid(sk->sk_family, sk->sk_type, - sk->sk_protocol, snum, &sid); + err = sel_netport_sid(sk->sk_protocol, snum, &sid); if (err) goto out; - perm = (isec->sclass == SECCLASS_TCP_SOCKET) ? + perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ? TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; - AVC_AUDIT_DATA_INIT(&ad,NET); - ad.u.net.dport = htons(snum); - ad.u.net.family = sk->sk_family; - err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad); + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->dport = htons(snum); + ad.u.net->family = sk->sk_family; + err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad); if (err) goto out; } + err = selinux_netlbl_socket_connect(sk, address); + out: return err; } static int selinux_socket_listen(struct socket *sock, int backlog) { - return socket_has_perm(current, sock, SOCKET__LISTEN); + return sock_has_perm(current, sock->sk, SOCKET__LISTEN); } static int selinux_socket_accept(struct socket *sock, struct socket *newsock) @@ -3392,7 +4153,7 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock) struct inode_security_struct *isec; struct inode_security_struct *newisec; - err = socket_has_perm(current, sock, SOCKET__ACCEPT); + err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT); if (err) return err; @@ -3407,38 +4168,32 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock) } static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, - int size) + int size) { - int rc; - - rc = socket_has_perm(current, sock, SOCKET__WRITE); - if (rc) - return rc; - - return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE); + return sock_has_perm(current, sock->sk, SOCKET__WRITE); } static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags) { - return socket_has_perm(current, sock, SOCKET__READ); + return sock_has_perm(current, sock->sk, SOCKET__READ); } static int selinux_socket_getsockname(struct socket *sock) { - return socket_has_perm(current, sock, SOCKET__GETATTR); + return sock_has_perm(current, sock->sk, SOCKET__GETATTR); } static int selinux_socket_getpeername(struct socket *sock) { - return socket_has_perm(current, sock, SOCKET__GETATTR); + return sock_has_perm(current, sock->sk, SOCKET__GETATTR); } -static int selinux_socket_setsockopt(struct socket *sock,int level,int optname) +static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) { int err; - err = socket_has_perm(current, sock, SOCKET__SETOPT); + err = sock_has_perm(current, sock->sk, SOCKET__SETOPT); if (err) return err; @@ -3448,199 +4203,186 @@ static int selinux_socket_setsockopt(struct socket *sock,int level,int optname) static int selinux_socket_getsockopt(struct socket *sock, int level, int optname) { - return socket_has_perm(current, sock, SOCKET__GETOPT); + return sock_has_perm(current, sock->sk, SOCKET__GETOPT); } static int selinux_socket_shutdown(struct socket *sock, int how) { - return socket_has_perm(current, sock, SOCKET__SHUTDOWN); + return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN); } -static int selinux_socket_unix_stream_connect(struct socket *sock, - struct socket *other, +static int selinux_socket_unix_stream_connect(struct sock *sock, + struct sock *other, struct sock *newsk) { - struct sk_security_struct *ssec; - struct inode_security_struct *isec; - struct inode_security_struct *other_isec; - struct avc_audit_data ad; + struct sk_security_struct *sksec_sock = sock->sk_security; + struct sk_security_struct *sksec_other = other->sk_security; + struct sk_security_struct *sksec_new = newsk->sk_security; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; int err; - err = secondary_ops->unix_stream_connect(sock, other, newsk); + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->sk = other; + + err = avc_has_perm(sksec_sock->sid, sksec_other->sid, + sksec_other->sclass, + UNIX_STREAM_SOCKET__CONNECTTO, &ad); if (err) return err; - isec = SOCK_INODE(sock)->i_security; - other_isec = SOCK_INODE(other)->i_security; - - AVC_AUDIT_DATA_INIT(&ad,NET); - ad.u.net.sk = other->sk; - - err = avc_has_perm(isec->sid, other_isec->sid, - isec->sclass, - UNIX_STREAM_SOCKET__CONNECTTO, &ad); + /* server child socket */ + sksec_new->peer_sid = sksec_sock->sid; + err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid, + &sksec_new->sid); if (err) return err; /* connecting socket */ - ssec = sock->sk->sk_security; - ssec->peer_sid = other_isec->sid; - - /* server child socket */ - ssec = newsk->sk_security; - ssec->peer_sid = isec->sid; - err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid); + sksec_sock->peer_sid = sksec_new->sid; - return err; + return 0; } static int selinux_socket_unix_may_send(struct socket *sock, struct socket *other) { - struct inode_security_struct *isec; - struct inode_security_struct *other_isec; - struct avc_audit_data ad; - int err; + struct sk_security_struct *ssec = sock->sk->sk_security; + struct sk_security_struct *osec = other->sk->sk_security; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; - isec = SOCK_INODE(sock)->i_security; - other_isec = SOCK_INODE(other)->i_security; + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->sk = other->sk; - AVC_AUDIT_DATA_INIT(&ad,NET); - ad.u.net.sk = other->sk; + return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO, + &ad); +} + +static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, + u32 peer_sid, + struct common_audit_data *ad) +{ + int err; + u32 if_sid; + u32 node_sid; - err = avc_has_perm(isec->sid, other_isec->sid, - isec->sclass, SOCKET__SENDTO, &ad); + err = sel_netif_sid(ifindex, &if_sid); + if (err) + return err; + err = avc_has_perm(peer_sid, if_sid, + SECCLASS_NETIF, NETIF__INGRESS, ad); if (err) return err; - return 0; + err = sel_netnode_sid(addrp, family, &node_sid); + if (err) + return err; + return avc_has_perm(peer_sid, node_sid, + SECCLASS_NODE, NODE__RECVFROM, ad); } static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, - struct avc_audit_data *ad, u16 family, char *addrp, int len) + u16 family) { int err = 0; - u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0; - struct socket *sock; - u16 sock_class = 0; - u32 sock_sid = 0; - - read_lock_bh(&sk->sk_callback_lock); - sock = sk->sk_socket; - if (sock) { - struct inode *inode; - inode = SOCK_INODE(sock); - if (inode) { - struct inode_security_struct *isec; - isec = inode->i_security; - sock_sid = isec->sid; - sock_class = isec->sclass; - } - } - read_unlock_bh(&sk->sk_callback_lock); - if (!sock_sid) - goto out; - - if (!skb->dev) - goto out; + struct sk_security_struct *sksec = sk->sk_security; + u32 sk_sid = sksec->sid; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; + char *addrp; - err = sel_netif_sids(skb->dev, &if_sid, NULL); + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->netif = skb->skb_iif; + ad.u.net->family = family; + err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); if (err) - goto out; - - switch (sock_class) { - case SECCLASS_UDP_SOCKET: - netif_perm = NETIF__UDP_RECV; - node_perm = NODE__UDP_RECV; - recv_perm = UDP_SOCKET__RECV_MSG; - break; - - case SECCLASS_TCP_SOCKET: - netif_perm = NETIF__TCP_RECV; - node_perm = NODE__TCP_RECV; - recv_perm = TCP_SOCKET__RECV_MSG; - break; - - case SECCLASS_DCCP_SOCKET: - netif_perm = NETIF__DCCP_RECV; - node_perm = NODE__DCCP_RECV; - recv_perm = DCCP_SOCKET__RECV_MSG; - break; + return err; - default: - netif_perm = NETIF__RAWIP_RECV; - node_perm = NODE__RAWIP_RECV; - break; + if (selinux_secmark_enabled()) { + err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, + PACKET__RECV, &ad); + if (err) + return err; } - err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, ad); - if (err) - goto out; - - err = security_node_sid(family, addrp, len, &node_sid); + err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); if (err) - goto out; - - err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, ad); - if (err) - goto out; - - if (recv_perm) { - u32 port_sid; - - err = security_port_sid(sk->sk_family, sk->sk_type, - sk->sk_protocol, ntohs(ad->u.net.sport), - &port_sid); - if (err) - goto out; - - err = avc_has_perm(sock_sid, port_sid, - sock_class, recv_perm, ad); - } + return err; + err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); -out: return err; } static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) { - u16 family; - char *addrp; - int len, err = 0; - struct avc_audit_data ad; + int err; struct sk_security_struct *sksec = sk->sk_security; + u16 family = sk->sk_family; + u32 sk_sid = sksec->sid; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; + char *addrp; + u8 secmark_active; + u8 peerlbl_active; - family = sk->sk_family; if (family != PF_INET && family != PF_INET6) - goto out; + return 0; /* Handle mapped IPv4 packets arriving via IPv6 sockets */ if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) family = PF_INET; - AVC_AUDIT_DATA_INIT(&ad, NET); - ad.u.net.netif = skb->dev ? skb->dev->name : "[unknown]"; - ad.u.net.family = family; + /* If any sort of compatibility mode is enabled then handoff processing + * to the selinux_sock_rcv_skb_compat() function to deal with the + * special handling. We do this in an attempt to keep this function + * as fast and as clean as possible. */ + if (!selinux_policycap_netpeer) + return selinux_sock_rcv_skb_compat(sk, skb, family); - err = selinux_parse_skb(skb, &ad, &addrp, &len, 1, NULL); - if (err) - goto out; + secmark_active = selinux_secmark_enabled(); + peerlbl_active = selinux_peerlbl_enabled(); + if (!secmark_active && !peerlbl_active) + return 0; - if (selinux_compat_net) - err = selinux_sock_rcv_skb_compat(sk, skb, &ad, family, - addrp, len); - else - err = avc_has_perm(sksec->sid, skb->secmark, SECCLASS_PACKET, - PACKET__RECV, &ad); + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->netif = skb->skb_iif; + ad.u.net->family = family; + err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); if (err) - goto out; + return err; - err = selinux_netlbl_sock_rcv_skb(sksec, skb, &ad); - if (err) - goto out; + if (peerlbl_active) { + u32 peer_sid; + + err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); + if (err) + return err; + err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family, + peer_sid, &ad); + if (err) { + selinux_netlbl_err(skb, err, 0); + return err; + } + err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, + PEER__RECV, &ad); + if (err) { + selinux_netlbl_err(skb, err, 0); + return err; + } + } + + if (secmark_active) { + err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, + PACKET__RECV, &ad); + if (err) + return err; + } - err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); -out: return err; } @@ -3650,26 +4392,18 @@ static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *op int err = 0; char *scontext; u32 scontext_len; - struct sk_security_struct *ssec; - struct inode_security_struct *isec; + struct sk_security_struct *sksec = sock->sk->sk_security; u32 peer_sid = SECSID_NULL; - isec = SOCK_INODE(sock)->i_security; - - if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET || - isec->sclass == SECCLASS_TCP_SOCKET) { - ssec = sock->sk->sk_security; - peer_sid = ssec->peer_sid; - } - if (peer_sid == SECSID_NULL) { - err = -ENOPROTOOPT; - goto out; - } + if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET || + sksec->sclass == SECCLASS_TCP_SOCKET) + peer_sid = sksec->peer_sid; + if (peer_sid == SECSID_NULL) + return -ENOPROTOOPT; err = security_sid_to_context(peer_sid, &scontext, &scontext_len); - if (err) - goto out; + return err; if (scontext_len > len) { err = -ERANGE; @@ -3682,48 +4416,71 @@ static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *op out_len: if (put_user(scontext_len, optlen)) err = -EFAULT; - kfree(scontext); -out: return err; } static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) { u32 peer_secid = SECSID_NULL; - int err = 0; + u16 family; + + if (skb && skb->protocol == htons(ETH_P_IP)) + family = PF_INET; + else if (skb && skb->protocol == htons(ETH_P_IPV6)) + family = PF_INET6; + else if (sock) + family = sock->sk->sk_family; + else + goto out; - if (sock && sock->sk->sk_family == PF_UNIX) - selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid); + if (sock && family == PF_UNIX) + selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid); else if (skb) - selinux_skb_extlbl_sid(skb, &peer_secid); + selinux_skb_peerlbl_sid(skb, family, &peer_secid); - if (peer_secid == SECSID_NULL) - err = -EINVAL; +out: *secid = peer_secid; - - return err; + if (peer_secid == SECSID_NULL) + return -EINVAL; + return 0; } static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority) { - return sk_alloc_security(sk, family, priority); + struct sk_security_struct *sksec; + + sksec = kzalloc(sizeof(*sksec), priority); + if (!sksec) + return -ENOMEM; + + sksec->peer_sid = SECINITSID_UNLABELED; + sksec->sid = SECINITSID_UNLABELED; + selinux_netlbl_sk_security_reset(sksec); + sk->sk_security = sksec; + + return 0; } static void selinux_sk_free_security(struct sock *sk) { - sk_free_security(sk); + struct sk_security_struct *sksec = sk->sk_security; + + sk->sk_security = NULL; + selinux_netlbl_sk_security_free(sksec); + kfree(sksec); } static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) { - struct sk_security_struct *ssec = sk->sk_security; - struct sk_security_struct *newssec = newsk->sk_security; + struct sk_security_struct *sksec = sk->sk_security; + struct sk_security_struct *newsksec = newsk->sk_security; - newssec->sid = ssec->sid; - newssec->peer_sid = ssec->peer_sid; + newsksec->sid = sksec->sid; + newsksec->peer_sid = sksec->peer_sid; + newsksec->sclass = sksec->sclass; - selinux_netlbl_sk_security_clone(ssec, newssec); + selinux_netlbl_sk_security_reset(newsksec); } static void selinux_sk_getsecid(struct sock *sk, u32 *secid) @@ -3737,7 +4494,7 @@ static void selinux_sk_getsecid(struct sock *sk, u32 *secid) } } -static void selinux_sock_graft(struct sock* sk, struct socket *parent) +static void selinux_sock_graft(struct sock *sk, struct socket *parent) { struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; struct sk_security_struct *sksec = sk->sk_security; @@ -3745,8 +4502,7 @@ static void selinux_sock_graft(struct sock* sk, struct socket *parent) if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || sk->sk_family == PF_UNIX) isec->sid = sksec->sid; - - selinux_netlbl_sock_graft(sk, parent); + sksec->sclass = isec->sclass; } static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, @@ -3754,23 +4510,20 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, { struct sk_security_struct *sksec = sk->sk_security; int err; - u32 newsid; + u16 family = req->rsk_ops->family; + u32 connsid; u32 peersid; - selinux_skb_extlbl_sid(skb, &peersid); - if (peersid == SECSID_NULL) { - req->secid = sksec->sid; - req->peer_secid = SECSID_NULL; - return 0; - } - - err = security_sid_mls_copy(sksec->sid, peersid, &newsid); + err = selinux_skb_peerlbl_sid(skb, family, &peersid); if (err) return err; - - req->secid = newsid; + err = selinux_conn_sid(sksec->sid, peersid, &connsid); + if (err) + return err; + req->secid = connsid; req->peer_secid = peersid; - return 0; + + return selinux_netlbl_inet_conn_request(req, family); } static void selinux_inet_csk_clone(struct sock *newsk, @@ -3787,21 +4540,129 @@ static void selinux_inet_csk_clone(struct sock *newsk, /* We don't need to take any sort of lock here as we are the only * thread with access to newsksec */ - selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family); + selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family); } -static void selinux_inet_conn_established(struct sock *sk, - struct sk_buff *skb) +static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb) { + u16 family = sk->sk_family; struct sk_security_struct *sksec = sk->sk_security; - selinux_skb_extlbl_sid(skb, &sksec->peer_sid); + /* handle mapped IPv4 packets arriving via IPv6 sockets */ + if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) + family = PF_INET; + + selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); +} + +static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk) +{ + skb_set_owner_w(skb, sk); +} + +static int selinux_secmark_relabel_packet(u32 sid) +{ + const struct task_security_struct *__tsec; + u32 tsid; + + __tsec = current_security(); + tsid = __tsec->sid; + + return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL); +} + +static void selinux_secmark_refcount_inc(void) +{ + atomic_inc(&selinux_secmark_refcount); +} + +static void selinux_secmark_refcount_dec(void) +{ + atomic_dec(&selinux_secmark_refcount); } static void selinux_req_classify_flow(const struct request_sock *req, struct flowi *fl) { - fl->secid = req->secid; + fl->flowi_secid = req->secid; +} + +static int selinux_tun_dev_alloc_security(void **security) +{ + struct tun_security_struct *tunsec; + + tunsec = kzalloc(sizeof(*tunsec), GFP_KERNEL); + if (!tunsec) + return -ENOMEM; + tunsec->sid = current_sid(); + + *security = tunsec; + return 0; +} + +static void selinux_tun_dev_free_security(void *security) +{ + kfree(security); +} + +static int selinux_tun_dev_create(void) +{ + u32 sid = current_sid(); + + /* we aren't taking into account the "sockcreate" SID since the socket + * that is being created here is not a socket in the traditional sense, + * instead it is a private sock, accessible only to the kernel, and + * representing a wide range of network traffic spanning multiple + * connections unlike traditional sockets - check the TUN driver to + * get a better understanding of why this socket is special */ + + return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE, + NULL); +} + +static int selinux_tun_dev_attach_queue(void *security) +{ + struct tun_security_struct *tunsec = security; + + return avc_has_perm(current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET, + TUN_SOCKET__ATTACH_QUEUE, NULL); +} + +static int selinux_tun_dev_attach(struct sock *sk, void *security) +{ + struct tun_security_struct *tunsec = security; + struct sk_security_struct *sksec = sk->sk_security; + + /* we don't currently perform any NetLabel based labeling here and it + * isn't clear that we would want to do so anyway; while we could apply + * labeling without the support of the TUN user the resulting labeled + * traffic from the other end of the connection would almost certainly + * cause confusion to the TUN user that had no idea network labeling + * protocols were being used */ + + sksec->sid = tunsec->sid; + sksec->sclass = SECCLASS_TUN_SOCKET; + + return 0; +} + +static int selinux_tun_dev_open(void *security) +{ + struct tun_security_struct *tunsec = security; + u32 sid = current_sid(); + int err; + + err = avc_has_perm(sid, tunsec->sid, SECCLASS_TUN_SOCKET, + TUN_SOCKET__RELABELFROM, NULL); + if (err) + return err; + err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, + TUN_SOCKET__RELABELTO, NULL); + if (err) + return err; + tunsec->sid = sid; + + return 0; } static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) @@ -3809,23 +4670,22 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) int err = 0; u32 perm; struct nlmsghdr *nlh; - struct socket *sock = sk->sk_socket; - struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; - - if (skb->len < NLMSG_SPACE(0)) { + struct sk_security_struct *sksec = sk->sk_security; + + if (skb->len < NLMSG_HDRLEN) { err = -EINVAL; goto out; } nlh = nlmsg_hdr(skb); - - err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm); + + err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm); if (err) { if (err == -EINVAL) { audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, "SELinux: unrecognized netlink message" " type=%hu for sclass=%hu\n", - nlh->nlmsg_type, isec->sclass); - if (!selinux_enforcing) + nlh->nlmsg_type, sksec->sclass); + if (!selinux_enforcing || security_get_allow_unknown()) err = 0; } @@ -3835,157 +4695,323 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) goto out; } - err = socket_has_perm(current, sock, perm); + err = sock_has_perm(current, sk, perm); out: return err; } #ifdef CONFIG_NETFILTER -static int selinux_ip_postroute_last_compat(struct sock *sk, struct net_device *dev, - struct avc_audit_data *ad, - u16 family, char *addrp, int len) +static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, + u16 family) { - int err = 0; - u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0; - struct socket *sock; - struct inode *inode; - struct inode_security_struct *isec; + int err; + char *addrp; + u32 peer_sid; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; + u8 secmark_active; + u8 netlbl_active; + u8 peerlbl_active; + + if (!selinux_policycap_netpeer) + return NF_ACCEPT; + + secmark_active = selinux_secmark_enabled(); + netlbl_active = netlbl_enabled(); + peerlbl_active = selinux_peerlbl_enabled(); + if (!secmark_active && !peerlbl_active) + return NF_ACCEPT; + + if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) + return NF_DROP; + + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->netif = ifindex; + ad.u.net->family = family; + if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) + return NF_DROP; + + if (peerlbl_active) { + err = selinux_inet_sys_rcv_skb(ifindex, addrp, family, + peer_sid, &ad); + if (err) { + selinux_netlbl_err(skb, err, 1); + return NF_DROP; + } + } - sock = sk->sk_socket; - if (!sock) - goto out; + if (secmark_active) + if (avc_has_perm(peer_sid, skb->secmark, + SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) + return NF_DROP; - inode = SOCK_INODE(sock); - if (!inode) - goto out; + if (netlbl_active) + /* we do this in the FORWARD path and not the POST_ROUTING + * path because we want to make sure we apply the necessary + * labeling before IPsec is applied so we can leverage AH + * protection */ + if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) + return NF_DROP; - isec = inode->i_security; - - err = sel_netif_sids(dev, &if_sid, NULL); - if (err) - goto out; + return NF_ACCEPT; +} - switch (isec->sclass) { - case SECCLASS_UDP_SOCKET: - netif_perm = NETIF__UDP_SEND; - node_perm = NODE__UDP_SEND; - send_perm = UDP_SOCKET__SEND_MSG; - break; - - case SECCLASS_TCP_SOCKET: - netif_perm = NETIF__TCP_SEND; - node_perm = NODE__TCP_SEND; - send_perm = TCP_SOCKET__SEND_MSG; - break; +static unsigned int selinux_ipv4_forward(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + return selinux_ip_forward(skb, in->ifindex, PF_INET); +} - case SECCLASS_DCCP_SOCKET: - netif_perm = NETIF__DCCP_SEND; - node_perm = NODE__DCCP_SEND; - send_perm = DCCP_SOCKET__SEND_MSG; - break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +static unsigned int selinux_ipv6_forward(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) +{ + return selinux_ip_forward(skb, in->ifindex, PF_INET6); +} +#endif /* IPV6 */ - default: - netif_perm = NETIF__RAWIP_SEND; - node_perm = NODE__RAWIP_SEND; - break; - } +static unsigned int selinux_ip_output(struct sk_buff *skb, + u16 family) +{ + struct sock *sk; + u32 sid; - err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF, netif_perm, ad); - if (err) - goto out; - - err = security_node_sid(family, addrp, len, &node_sid); - if (err) - goto out; - - err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE, node_perm, ad); - if (err) - goto out; + if (!netlbl_enabled()) + return NF_ACCEPT; - if (send_perm) { - u32 port_sid; - - err = security_port_sid(sk->sk_family, - sk->sk_type, - sk->sk_protocol, - ntohs(ad->u.net.dport), - &port_sid); - if (err) - goto out; + /* we do this in the LOCAL_OUT path and not the POST_ROUTING path + * because we want to make sure we apply the necessary labeling + * before IPsec is applied so we can leverage AH protection */ + sk = skb->sk; + if (sk) { + struct sk_security_struct *sksec; + + if (sk->sk_state == TCP_LISTEN) + /* if the socket is the listening state then this + * packet is a SYN-ACK packet which means it needs to + * be labeled based on the connection/request_sock and + * not the parent socket. unfortunately, we can't + * lookup the request_sock yet as it isn't queued on + * the parent socket until after the SYN-ACK is sent. + * the "solution" is to simply pass the packet as-is + * as any IP option based labeling should be copied + * from the initial connection request (in the IP + * layer). it is far from ideal, but until we get a + * security label in the packet itself this is the + * best we can do. */ + return NF_ACCEPT; + + /* standard practice, label using the parent socket */ + sksec = sk->sk_security; + sid = sksec->sid; + } else + sid = SECINITSID_KERNEL; + if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) + return NF_DROP; - err = avc_has_perm(isec->sid, port_sid, isec->sclass, - send_perm, ad); - } -out: - return err; + return NF_ACCEPT; } -static unsigned int selinux_ip_postroute_last(unsigned int hooknum, - struct sk_buff **pskb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *), - u16 family) +static unsigned int selinux_ipv4_output(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { - char *addrp; - int len, err = 0; - struct sock *sk; - struct sk_buff *skb = *pskb; - struct avc_audit_data ad; - struct net_device *dev = (struct net_device *)out; + return selinux_ip_output(skb, PF_INET); +} + +static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, + int ifindex, + u16 family) +{ + struct sock *sk = skb->sk; struct sk_security_struct *sksec; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; + char *addrp; u8 proto; - sk = skb->sk; - if (!sk) - goto out; - + if (sk == NULL) + return NF_ACCEPT; sksec = sk->sk_security; - AVC_AUDIT_DATA_INIT(&ad, NET); - ad.u.net.netif = dev->name; - ad.u.net.family = family; + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->netif = ifindex; + ad.u.net->family = family; + if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) + return NF_DROP; - err = selinux_parse_skb(skb, &ad, &addrp, &len, 0, &proto); - if (err) - goto out; + if (selinux_secmark_enabled()) + if (avc_has_perm(sksec->sid, skb->secmark, + SECCLASS_PACKET, PACKET__SEND, &ad)) + return NF_DROP_ERR(-ECONNREFUSED); - if (selinux_compat_net) - err = selinux_ip_postroute_last_compat(sk, dev, &ad, - family, addrp, len); - else - err = avc_has_perm(sksec->sid, skb->secmark, SECCLASS_PACKET, - PACKET__SEND, &ad); + if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) + return NF_DROP_ERR(-ECONNREFUSED); - if (err) - goto out; + return NF_ACCEPT; +} - err = selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto); -out: - return err ? NF_DROP : NF_ACCEPT; +static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, + u16 family) +{ + u32 secmark_perm; + u32 peer_sid; + struct sock *sk; + struct common_audit_data ad; + struct lsm_network_audit net = {0,}; + char *addrp; + u8 secmark_active; + u8 peerlbl_active; + + /* If any sort of compatibility mode is enabled then handoff processing + * to the selinux_ip_postroute_compat() function to deal with the + * special handling. We do this in an attempt to keep this function + * as fast and as clean as possible. */ + if (!selinux_policycap_netpeer) + return selinux_ip_postroute_compat(skb, ifindex, family); + + secmark_active = selinux_secmark_enabled(); + peerlbl_active = selinux_peerlbl_enabled(); + if (!secmark_active && !peerlbl_active) + return NF_ACCEPT; + + sk = skb->sk; + +#ifdef CONFIG_XFRM + /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec + * packet transformation so allow the packet to pass without any checks + * since we'll have another chance to perform access control checks + * when the packet is on it's final way out. + * NOTE: there appear to be some IPv6 multicast cases where skb->dst + * is NULL, in this case go ahead and apply access control. + * NOTE: if this is a local socket (skb->sk != NULL) that is in the + * TCP listening state we cannot wait until the XFRM processing + * is done as we will miss out on the SA label if we do; + * unfortunately, this means more work, but it is only once per + * connection. */ + if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL && + !(sk != NULL && sk->sk_state == TCP_LISTEN)) + return NF_ACCEPT; +#endif + + if (sk == NULL) { + /* Without an associated socket the packet is either coming + * from the kernel or it is being forwarded; check the packet + * to determine which and if the packet is being forwarded + * query the packet directly to determine the security label. */ + if (skb->skb_iif) { + secmark_perm = PACKET__FORWARD_OUT; + if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) + return NF_DROP; + } else { + secmark_perm = PACKET__SEND; + peer_sid = SECINITSID_KERNEL; + } + } else if (sk->sk_state == TCP_LISTEN) { + /* Locally generated packet but the associated socket is in the + * listening state which means this is a SYN-ACK packet. In + * this particular case the correct security label is assigned + * to the connection/request_sock but unfortunately we can't + * query the request_sock as it isn't queued on the parent + * socket until after the SYN-ACK packet is sent; the only + * viable choice is to regenerate the label like we do in + * selinux_inet_conn_request(). See also selinux_ip_output() + * for similar problems. */ + u32 skb_sid; + struct sk_security_struct *sksec = sk->sk_security; + if (selinux_skb_peerlbl_sid(skb, family, &skb_sid)) + return NF_DROP; + /* At this point, if the returned skb peerlbl is SECSID_NULL + * and the packet has been through at least one XFRM + * transformation then we must be dealing with the "final" + * form of labeled IPsec packet; since we've already applied + * all of our access controls on this packet we can safely + * pass the packet. */ + if (skb_sid == SECSID_NULL) { + switch (family) { + case PF_INET: + if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) + return NF_ACCEPT; + break; + case PF_INET6: + if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) + return NF_ACCEPT; + default: + return NF_DROP_ERR(-ECONNREFUSED); + } + } + if (selinux_conn_sid(sksec->sid, skb_sid, &peer_sid)) + return NF_DROP; + secmark_perm = PACKET__SEND; + } else { + /* Locally generated packet, fetch the security label from the + * associated socket. */ + struct sk_security_struct *sksec = sk->sk_security; + peer_sid = sksec->sid; + secmark_perm = PACKET__SEND; + } + + ad.type = LSM_AUDIT_DATA_NET; + ad.u.net = &net; + ad.u.net->netif = ifindex; + ad.u.net->family = family; + if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) + return NF_DROP; + + if (secmark_active) + if (avc_has_perm(peer_sid, skb->secmark, + SECCLASS_PACKET, secmark_perm, &ad)) + return NF_DROP_ERR(-ECONNREFUSED); + + if (peerlbl_active) { + u32 if_sid; + u32 node_sid; + + if (sel_netif_sid(ifindex, &if_sid)) + return NF_DROP; + if (avc_has_perm(peer_sid, if_sid, + SECCLASS_NETIF, NETIF__EGRESS, &ad)) + return NF_DROP_ERR(-ECONNREFUSED); + + if (sel_netnode_sid(addrp, family, &node_sid)) + return NF_DROP; + if (avc_has_perm(peer_sid, node_sid, + SECCLASS_NODE, NODE__SENDTO, &ad)) + return NF_DROP_ERR(-ECONNREFUSED); + } + + return NF_ACCEPT; } -static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum, - struct sk_buff **pskb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) +static unsigned int selinux_ipv4_postroute(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { - return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET); + return selinux_ip_postroute(skb, out->ifindex, PF_INET); } #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) - -static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum, - struct sk_buff **pskb, - const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) +static unsigned int selinux_ipv6_postroute(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { - return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET6); + return selinux_ip_postroute(skb, out->ifindex, PF_INET6); } - #endif /* IPV6 */ #endif /* CONFIG_NETFILTER */ @@ -3994,46 +5020,27 @@ static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) { int err; - err = secondary_ops->netlink_send(sk, skb); + err = cap_netlink_send(sk, skb); if (err) return err; - if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS) - err = selinux_nlmsg_perm(sk, skb); - - return err; -} - -static int selinux_netlink_recv(struct sk_buff *skb, int capability) -{ - int err; - struct avc_audit_data ad; - - err = secondary_ops->netlink_recv(skb, capability); - if (err) - return err; - - AVC_AUDIT_DATA_INIT(&ad, CAP); - ad.u.cap = capability; - - return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid, - SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad); + return selinux_nlmsg_perm(sk, skb); } static int ipc_alloc_security(struct task_struct *task, struct kern_ipc_perm *perm, u16 sclass) { - struct task_security_struct *tsec = task->security; struct ipc_security_struct *isec; + u32 sid; isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); if (!isec) return -ENOMEM; + sid = task_sid(task); isec->sclass = sclass; - isec->ipc_perm = perm; - isec->sid = tsec->sid; + isec->sid = sid; perm->security = isec; return 0; @@ -4054,7 +5061,6 @@ static int msg_msg_alloc_security(struct msg_msg *msg) if (!msec) return -ENOMEM; - msec->msg = msg; msec->sid = SECINITSID_UNLABELED; msg->security = msec; @@ -4072,17 +5078,16 @@ static void msg_msg_free_security(struct msg_msg *msg) static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, u32 perms) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = ipc_perms->security; - AVC_AUDIT_DATA_INIT(&ad, IPC); + ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = ipc_perms->key; - return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad); + return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); } static int selinux_msg_msg_alloc_security(struct msg_msg *msg) @@ -4098,22 +5103,21 @@ static void selinux_msg_msg_free_security(struct msg_msg *msg) /* message queue security operations */ static int selinux_msg_queue_alloc_security(struct msg_queue *msq) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); int rc; rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); if (rc) return rc; - tsec = current->security; isec = msq->q_perm.security; - AVC_AUDIT_DATA_INIT(&ad, IPC); - ad.u.ipc_id = msq->q_perm.key; + ad.type = LSM_AUDIT_DATA_IPC; + ad.u.ipc_id = msq->q_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, + rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__CREATE, &ad); if (rc) { ipc_free_security(&msq->q_perm); @@ -4129,17 +5133,16 @@ static void selinux_msg_queue_free_security(struct msg_queue *msq) static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = msq->q_perm.security; - AVC_AUDIT_DATA_INIT(&ad, IPC); + ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = msq->q_perm.key; - return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, + return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__ASSOCIATE, &ad); } @@ -4148,7 +5151,7 @@ static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) int err; int perms; - switch(cmd) { + switch (cmd) { case IPC_INFO: case MSG_INFO: /* No specific object, just general system-wide information. */ @@ -4173,13 +5176,12 @@ static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct msg_security_struct *msec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); int rc; - tsec = current->security; isec = msq->q_perm.security; msec = msg->security; @@ -4191,28 +5193,26 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, * Compute new sid based on current process and * message queue this message will be stored in */ - rc = security_transition_sid(tsec->sid, - isec->sid, - SECCLASS_MSG, - &msec->sid); + rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, + NULL, &msec->sid); if (rc) return rc; } - AVC_AUDIT_DATA_INIT(&ad, IPC); + ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = msq->q_perm.key; /* Can this process write to the queue? */ - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ, + rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__WRITE, &ad); if (!rc) /* Can this process send the message */ - rc = avc_has_perm(tsec->sid, msec->sid, - SECCLASS_MSG, MSG__SEND, &ad); + rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, + MSG__SEND, &ad); if (!rc) /* Can the message be put in the queue? */ - rc = avc_has_perm(msec->sid, isec->sid, - SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad); + rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, + MSGQ__ENQUEUE, &ad); return rc; } @@ -4221,23 +5221,22 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; struct msg_security_struct *msec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = task_sid(target); int rc; - tsec = target->security; isec = msq->q_perm.security; msec = msg->security; - AVC_AUDIT_DATA_INIT(&ad, IPC); - ad.u.ipc_id = msq->q_perm.key; + ad.type = LSM_AUDIT_DATA_IPC; + ad.u.ipc_id = msq->q_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, + rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, MSGQ__READ, &ad); if (!rc) - rc = avc_has_perm(tsec->sid, msec->sid, + rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, MSG__RECEIVE, &ad); return rc; } @@ -4245,22 +5244,21 @@ static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, /* Shared Memory security operations */ static int selinux_shm_alloc_security(struct shmid_kernel *shp) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); int rc; rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); if (rc) return rc; - tsec = current->security; isec = shp->shm_perm.security; - AVC_AUDIT_DATA_INIT(&ad, IPC); - ad.u.ipc_id = shp->shm_perm.key; + ad.type = LSM_AUDIT_DATA_IPC; + ad.u.ipc_id = shp->shm_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, + rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, SHM__CREATE, &ad); if (rc) { ipc_free_security(&shp->shm_perm); @@ -4276,17 +5274,16 @@ static void selinux_shm_free_security(struct shmid_kernel *shp) static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = shp->shm_perm.security; - AVC_AUDIT_DATA_INIT(&ad, IPC); + ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = shp->shm_perm.key; - return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM, + return avc_has_perm(sid, isec->sid, SECCLASS_SHM, SHM__ASSOCIATE, &ad); } @@ -4296,7 +5293,7 @@ static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) int perms; int err; - switch(cmd) { + switch (cmd) { case IPC_INFO: case SHM_INFO: /* No specific object, just general system-wide information. */ @@ -4327,11 +5324,6 @@ static int selinux_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg) { u32 perms; - int rc; - - rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg); - if (rc) - return rc; if (shmflg & SHM_RDONLY) perms = SHM__READ; @@ -4344,22 +5336,21 @@ static int selinux_shm_shmat(struct shmid_kernel *shp, /* Semaphore security operations */ static int selinux_sem_alloc_security(struct sem_array *sma) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); int rc; rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); if (rc) return rc; - tsec = current->security; isec = sma->sem_perm.security; - AVC_AUDIT_DATA_INIT(&ad, IPC); - ad.u.ipc_id = sma->sem_perm.key; + ad.type = LSM_AUDIT_DATA_IPC; + ad.u.ipc_id = sma->sem_perm.key; - rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, + rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, SEM__CREATE, &ad); if (rc) { ipc_free_security(&sma->sem_perm); @@ -4375,17 +5366,16 @@ static void selinux_sem_free_security(struct sem_array *sma) static int selinux_sem_associate(struct sem_array *sma, int semflg) { - struct task_security_struct *tsec; struct ipc_security_struct *isec; - struct avc_audit_data ad; + struct common_audit_data ad; + u32 sid = current_sid(); - tsec = current->security; isec = sma->sem_perm.security; - AVC_AUDIT_DATA_INIT(&ad, IPC); + ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = sma->sem_perm.key; - return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM, + return avc_has_perm(sid, isec->sid, SECCLASS_SEM, SEM__ASSOCIATE, &ad); } @@ -4395,7 +5385,7 @@ static int selinux_sem_semctl(struct sem_array *sma, int cmd) int err; u32 perms; - switch(cmd) { + switch (cmd) { case IPC_INFO: case SEM_INFO: /* No specific object, just general system-wide information. */ @@ -4460,38 +5450,13 @@ static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) return ipc_has_perm(ipcp, av); } -/* module stacking operations */ -static int selinux_register_security (const char *name, struct security_operations *ops) +static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) { - if (secondary_ops != original_ops) { - printk(KERN_ERR "%s: There is already a secondary security " - "module registered.\n", __FUNCTION__); - return -EINVAL; - } - - secondary_ops = ops; - - printk(KERN_INFO "%s: Registering secondary module %s\n", - __FUNCTION__, - name); - - return 0; -} - -static int selinux_unregister_security (const char *name, struct security_operations *ops) -{ - if (ops != secondary_ops) { - printk(KERN_ERR "%s: trying to unregister a security module " - "that is not registered.\n", __FUNCTION__); - return -EINVAL; - } - - secondary_ops = original_ops; - - return 0; + struct ipc_security_struct *isec = ipcp->security; + *secid = isec->sid; } -static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode) +static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) { if (inode) inode_doinit_with_dentry(inode, dentry); @@ -4500,33 +5465,35 @@ static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode) static int selinux_getprocattr(struct task_struct *p, char *name, char **value) { - struct task_security_struct *tsec; + const struct task_security_struct *__tsec; u32 sid; int error; unsigned len; if (current != p) { - error = task_has_perm(current, p, PROCESS__GETATTR); + error = current_has_perm(p, PROCESS__GETATTR); if (error) return error; } - tsec = p->security; + rcu_read_lock(); + __tsec = __task_cred(p)->security; if (!strcmp(name, "current")) - sid = tsec->sid; + sid = __tsec->sid; else if (!strcmp(name, "prev")) - sid = tsec->osid; + sid = __tsec->osid; else if (!strcmp(name, "exec")) - sid = tsec->exec_sid; + sid = __tsec->exec_sid; else if (!strcmp(name, "fscreate")) - sid = tsec->create_sid; + sid = __tsec->create_sid; else if (!strcmp(name, "keycreate")) - sid = tsec->keycreate_sid; + sid = __tsec->keycreate_sid; else if (!strcmp(name, "sockcreate")) - sid = tsec->sockcreate_sid; + sid = __tsec->sockcreate_sid; else - return -EINVAL; + goto invalid; + rcu_read_unlock(); if (!sid) return 0; @@ -4535,13 +5502,19 @@ static int selinux_getprocattr(struct task_struct *p, if (error) return error; return len; + +invalid: + rcu_read_unlock(); + return -EINVAL; } static int selinux_setprocattr(struct task_struct *p, char *name, void *value, size_t size) { struct task_security_struct *tsec; - u32 sid = 0; + struct task_struct *tracer; + struct cred *new; + u32 sid = 0, ptsid; int error; char *str = value; @@ -4557,15 +5530,15 @@ static int selinux_setprocattr(struct task_struct *p, * above restriction is ever removed. */ if (!strcmp(name, "exec")) - error = task_has_perm(current, p, PROCESS__SETEXEC); + error = current_has_perm(p, PROCESS__SETEXEC); else if (!strcmp(name, "fscreate")) - error = task_has_perm(current, p, PROCESS__SETFSCREATE); + error = current_has_perm(p, PROCESS__SETFSCREATE); else if (!strcmp(name, "keycreate")) - error = task_has_perm(current, p, PROCESS__SETKEYCREATE); + error = current_has_perm(p, PROCESS__SETKEYCREATE); else if (!strcmp(name, "sockcreate")) - error = task_has_perm(current, p, PROCESS__SETSOCKCREATE); + error = current_has_perm(p, PROCESS__SETSOCKCREATE); else if (!strcmp(name, "current")) - error = task_has_perm(current, p, PROCESS__SETCURRENT); + error = current_has_perm(p, PROCESS__SETCURRENT); else error = -EINVAL; if (error) @@ -4577,78 +5550,106 @@ static int selinux_setprocattr(struct task_struct *p, str[size-1] = 0; size--; } - error = security_context_to_sid(value, size, &sid); + error = security_context_to_sid(value, size, &sid, GFP_KERNEL); + if (error == -EINVAL && !strcmp(name, "fscreate")) { + if (!capable(CAP_MAC_ADMIN)) { + struct audit_buffer *ab; + size_t audit_size; + + /* We strip a nul only if it is at the end, otherwise the + * context contains a nul and we should audit that */ + if (str[size - 1] == '\0') + audit_size = size - 1; + else + audit_size = size; + ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR); + audit_log_format(ab, "op=fscreate invalid_context="); + audit_log_n_untrustedstring(ab, value, audit_size); + audit_log_end(ab); + + return error; + } + error = security_context_to_sid_force(value, size, + &sid); + } if (error) return error; } + new = prepare_creds(); + if (!new) + return -ENOMEM; + /* Permission checking based on the specified context is performed during the actual operation (execve, open/mkdir/...), when we know the full context of the - operation. See selinux_bprm_set_security for the execve + operation. See selinux_bprm_set_creds for the execve checks and may_create for the file creation checks. The operation will then fail if the context is not permitted. */ - tsec = p->security; - if (!strcmp(name, "exec")) + tsec = new->security; + if (!strcmp(name, "exec")) { tsec->exec_sid = sid; - else if (!strcmp(name, "fscreate")) + } else if (!strcmp(name, "fscreate")) { tsec->create_sid = sid; - else if (!strcmp(name, "keycreate")) { + } else if (!strcmp(name, "keycreate")) { error = may_create_key(sid, p); if (error) - return error; + goto abort_change; tsec->keycreate_sid = sid; - } else if (!strcmp(name, "sockcreate")) + } else if (!strcmp(name, "sockcreate")) { tsec->sockcreate_sid = sid; - else if (!strcmp(name, "current")) { - struct av_decision avd; - + } else if (!strcmp(name, "current")) { + error = -EINVAL; if (sid == 0) - return -EINVAL; + goto abort_change; /* Only allow single threaded processes to change context */ - if (atomic_read(&p->mm->mm_users) != 1) { - struct task_struct *g, *t; - struct mm_struct *mm = p->mm; - read_lock(&tasklist_lock); - do_each_thread(g, t) - if (t->mm == mm && t != p) { - read_unlock(&tasklist_lock); - return -EPERM; - } - while_each_thread(g, t); - read_unlock(&tasklist_lock); - } + error = -EPERM; + if (!current_is_single_threaded()) { + error = security_bounded_transition(tsec->sid, sid); + if (error) + goto abort_change; + } /* Check permissions for the transition. */ error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, - PROCESS__DYNTRANSITION, NULL); + PROCESS__DYNTRANSITION, NULL); if (error) - return error; + goto abort_change; /* Check for ptracing, and update the task SID if ok. Otherwise, leave SID unchanged and fail. */ - task_lock(p); - if (p->ptrace & PT_PTRACED) { - error = avc_has_perm_noaudit(tsec->ptrace_sid, sid, - SECCLASS_PROCESS, - PROCESS__PTRACE, 0, &avd); - if (!error) - tsec->sid = sid; - task_unlock(p); - avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS, - PROCESS__PTRACE, &avd, error, NULL); + ptsid = 0; + rcu_read_lock(); + tracer = ptrace_parent(p); + if (tracer) + ptsid = task_sid(tracer); + rcu_read_unlock(); + + if (tracer) { + error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, + PROCESS__PTRACE, NULL); if (error) - return error; - } else { - tsec->sid = sid; - task_unlock(p); + goto abort_change; } + + tsec->sid = sid; + } else { + error = -EINVAL; + goto abort_change; } - else - return -EINVAL; + commit_creds(new); return size; + +abort_change: + abort_creds(new); + return error; +} + +static int selinux_ismaclabel(const char *name) +{ + return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0); } static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) @@ -4656,31 +5657,61 @@ static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) return security_sid_to_context(secid, secdata, seclen); } +static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) +{ + return security_context_to_sid(secdata, seclen, secid, GFP_KERNEL); +} + static void selinux_release_secctx(char *secdata, u32 seclen) { - if (secdata) - kfree(secdata); + kfree(secdata); } +/* + * called with inode->i_mutex locked + */ +static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) +{ + return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0); +} + +/* + * called with inode->i_mutex locked + */ +static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) +{ + return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0); +} + +static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) +{ + int len = 0; + len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX, + ctx, true); + if (len < 0) + return len; + *ctxlen = len; + return 0; +} #ifdef CONFIG_KEYS -static int selinux_key_alloc(struct key *k, struct task_struct *tsk, +static int selinux_key_alloc(struct key *k, const struct cred *cred, unsigned long flags) { - struct task_security_struct *tsec = tsk->security; + const struct task_security_struct *tsec; struct key_security_struct *ksec; ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); if (!ksec) return -ENOMEM; - ksec->obj = k; + tsec = cred->security; if (tsec->keycreate_sid) ksec->sid = tsec->keycreate_sid; else ksec->sid = tsec->sid; - k->security = ksec; + k->security = ksec; return 0; } @@ -4693,17 +5724,12 @@ static void selinux_key_free(struct key *k) } static int selinux_key_permission(key_ref_t key_ref, - struct task_struct *ctx, - key_perm_t perm) + const struct cred *cred, + unsigned perm) { struct key *key; - struct task_security_struct *tsec; struct key_security_struct *ksec; - - key = key_ref_to_ptr(key_ref); - - tsec = ctx->security; - ksec = key->security; + u32 sid; /* if no specific permissions are requested, we skip the permission check. No serious, additional covert channels @@ -4711,18 +5737,37 @@ static int selinux_key_permission(key_ref_t key_ref, if (perm == 0) return 0; - return avc_has_perm(tsec->sid, ksec->sid, - SECCLASS_KEY, perm, NULL); + sid = cred_sid(cred); + + key = key_ref_to_ptr(key_ref); + ksec = key->security; + + return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); +} + +static int selinux_key_getsecurity(struct key *key, char **_buffer) +{ + struct key_security_struct *ksec = key->security; + char *context = NULL; + unsigned len; + int rc; + + rc = security_sid_to_context(ksec->sid, &context, &len); + if (!rc) + rc = len; + *_buffer = context; + return rc; } #endif static struct security_operations selinux_ops = { - .ptrace = selinux_ptrace, + .name = "selinux", + + .ptrace_access_check = selinux_ptrace_access_check, + .ptrace_traceme = selinux_ptrace_traceme, .capget = selinux_capget, - .capset_check = selinux_capset_check, - .capset_set = selinux_capset_set, - .sysctl = selinux_sysctl, + .capset = selinux_capset, .capable = selinux_capable, .quotactl = selinux_quotactl, .quota_on = selinux_quota_on, @@ -4730,23 +5775,26 @@ static struct security_operations selinux_ops = { .vm_enough_memory = selinux_vm_enough_memory, .netlink_send = selinux_netlink_send, - .netlink_recv = selinux_netlink_recv, - - .bprm_alloc_security = selinux_bprm_alloc_security, - .bprm_free_security = selinux_bprm_free_security, - .bprm_apply_creds = selinux_bprm_apply_creds, - .bprm_post_apply_creds = selinux_bprm_post_apply_creds, - .bprm_set_security = selinux_bprm_set_security, - .bprm_check_security = selinux_bprm_check_security, + + .bprm_set_creds = selinux_bprm_set_creds, + .bprm_committing_creds = selinux_bprm_committing_creds, + .bprm_committed_creds = selinux_bprm_committed_creds, .bprm_secureexec = selinux_bprm_secureexec, .sb_alloc_security = selinux_sb_alloc_security, .sb_free_security = selinux_sb_free_security, .sb_copy_data = selinux_sb_copy_data, - .sb_kern_mount = selinux_sb_kern_mount, + .sb_remount = selinux_sb_remount, + .sb_kern_mount = selinux_sb_kern_mount, + .sb_show_options = selinux_sb_show_options, .sb_statfs = selinux_sb_statfs, .sb_mount = selinux_mount, .sb_umount = selinux_umount, + .sb_set_mnt_opts = selinux_set_mnt_opts, + .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, + .sb_parse_opts_str = selinux_parse_opts_str, + + .dentry_init_security = selinux_dentry_init_security, .inode_alloc_security = selinux_inode_alloc_security, .inode_free_security = selinux_inode_free_security, @@ -4769,16 +5817,17 @@ static struct security_operations selinux_ops = { .inode_getxattr = selinux_inode_getxattr, .inode_listxattr = selinux_inode_listxattr, .inode_removexattr = selinux_inode_removexattr, - .inode_xattr_getsuffix = selinux_inode_xattr_getsuffix, - .inode_getsecurity = selinux_inode_getsecurity, - .inode_setsecurity = selinux_inode_setsecurity, - .inode_listsecurity = selinux_inode_listsecurity, + .inode_getsecurity = selinux_inode_getsecurity, + .inode_setsecurity = selinux_inode_setsecurity, + .inode_listsecurity = selinux_inode_listsecurity, + .inode_getsecid = selinux_inode_getsecid, .file_permission = selinux_file_permission, .file_alloc_security = selinux_file_alloc_security, .file_free_security = selinux_file_free_security, .file_ioctl = selinux_file_ioctl, - .file_mmap = selinux_file_mmap, + .mmap_file = selinux_mmap_file, + .mmap_addr = selinux_mmap_addr, .file_mprotect = selinux_file_mprotect, .file_lock = selinux_file_lock, .file_fcntl = selinux_file_fcntl, @@ -4786,17 +5835,20 @@ static struct security_operations selinux_ops = { .file_send_sigiotask = selinux_file_send_sigiotask, .file_receive = selinux_file_receive, + .file_open = selinux_file_open, + .task_create = selinux_task_create, - .task_alloc_security = selinux_task_alloc_security, - .task_free_security = selinux_task_free_security, - .task_setuid = selinux_task_setuid, - .task_post_setuid = selinux_task_post_setuid, - .task_setgid = selinux_task_setgid, + .cred_alloc_blank = selinux_cred_alloc_blank, + .cred_free = selinux_cred_free, + .cred_prepare = selinux_cred_prepare, + .cred_transfer = selinux_cred_transfer, + .kernel_act_as = selinux_kernel_act_as, + .kernel_create_files_as = selinux_kernel_create_files_as, + .kernel_module_request = selinux_kernel_module_request, .task_setpgid = selinux_task_setpgid, .task_getpgid = selinux_task_getpgid, - .task_getsid = selinux_task_getsid, + .task_getsid = selinux_task_getsid, .task_getsecid = selinux_task_getsecid, - .task_setgroups = selinux_task_setgroups, .task_setnice = selinux_task_setnice, .task_setioprio = selinux_task_setioprio, .task_getioprio = selinux_task_getioprio, @@ -4806,11 +5858,10 @@ static struct security_operations selinux_ops = { .task_movememory = selinux_task_movememory, .task_kill = selinux_task_kill, .task_wait = selinux_task_wait, - .task_prctl = selinux_task_prctl, - .task_reparent_to_init = selinux_task_reparent_to_init, - .task_to_inode = selinux_task_to_inode, + .task_to_inode = selinux_task_to_inode, .ipc_permission = selinux_ipc_permission, + .ipc_getsecid = selinux_ipc_getsecid, .msg_msg_alloc_security = selinux_msg_msg_alloc_security, .msg_msg_free_security = selinux_msg_msg_free_security, @@ -4828,24 +5879,26 @@ static struct security_operations selinux_ops = { .shm_shmctl = selinux_shm_shmctl, .shm_shmat = selinux_shm_shmat, - .sem_alloc_security = selinux_sem_alloc_security, - .sem_free_security = selinux_sem_free_security, + .sem_alloc_security = selinux_sem_alloc_security, + .sem_free_security = selinux_sem_free_security, .sem_associate = selinux_sem_associate, .sem_semctl = selinux_sem_semctl, .sem_semop = selinux_sem_semop, - .register_security = selinux_register_security, - .unregister_security = selinux_unregister_security, + .d_instantiate = selinux_d_instantiate, - .d_instantiate = selinux_d_instantiate, - - .getprocattr = selinux_getprocattr, - .setprocattr = selinux_setprocattr, + .getprocattr = selinux_getprocattr, + .setprocattr = selinux_setprocattr, + .ismaclabel = selinux_ismaclabel, .secid_to_secctx = selinux_secid_to_secctx, + .secctx_to_secid = selinux_secctx_to_secid, .release_secctx = selinux_release_secctx, + .inode_notifysecctx = selinux_inode_notifysecctx, + .inode_setsecctx = selinux_inode_setsecctx, + .inode_getsecctx = selinux_inode_getsecctx, - .unix_stream_connect = selinux_socket_unix_stream_connect, + .unix_stream_connect = selinux_socket_unix_stream_connect, .unix_may_send = selinux_socket_unix_may_send, .socket_create = selinux_socket_create, @@ -4867,36 +5920,58 @@ static struct security_operations selinux_ops = { .sk_alloc_security = selinux_sk_alloc_security, .sk_free_security = selinux_sk_free_security, .sk_clone_security = selinux_sk_clone_security, - .sk_getsecid = selinux_sk_getsecid, + .sk_getsecid = selinux_sk_getsecid, .sock_graft = selinux_sock_graft, .inet_conn_request = selinux_inet_conn_request, .inet_csk_clone = selinux_inet_csk_clone, .inet_conn_established = selinux_inet_conn_established, + .secmark_relabel_packet = selinux_secmark_relabel_packet, + .secmark_refcount_inc = selinux_secmark_refcount_inc, + .secmark_refcount_dec = selinux_secmark_refcount_dec, .req_classify_flow = selinux_req_classify_flow, + .tun_dev_alloc_security = selinux_tun_dev_alloc_security, + .tun_dev_free_security = selinux_tun_dev_free_security, + .tun_dev_create = selinux_tun_dev_create, + .tun_dev_attach_queue = selinux_tun_dev_attach_queue, + .tun_dev_attach = selinux_tun_dev_attach, + .tun_dev_open = selinux_tun_dev_open, + .skb_owned_by = selinux_skb_owned_by, #ifdef CONFIG_SECURITY_NETWORK_XFRM .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, .xfrm_policy_clone_security = selinux_xfrm_policy_clone, .xfrm_policy_free_security = selinux_xfrm_policy_free, .xfrm_policy_delete_security = selinux_xfrm_policy_delete, - .xfrm_state_alloc_security = selinux_xfrm_state_alloc, + .xfrm_state_alloc = selinux_xfrm_state_alloc, + .xfrm_state_alloc_acquire = selinux_xfrm_state_alloc_acquire, .xfrm_state_free_security = selinux_xfrm_state_free, .xfrm_state_delete_security = selinux_xfrm_state_delete, - .xfrm_policy_lookup = selinux_xfrm_policy_lookup, + .xfrm_policy_lookup = selinux_xfrm_policy_lookup, .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, .xfrm_decode_session = selinux_xfrm_decode_session, #endif #ifdef CONFIG_KEYS - .key_alloc = selinux_key_alloc, - .key_free = selinux_key_free, - .key_permission = selinux_key_permission, + .key_alloc = selinux_key_alloc, + .key_free = selinux_key_free, + .key_permission = selinux_key_permission, + .key_getsecurity = selinux_key_getsecurity, +#endif + +#ifdef CONFIG_AUDIT + .audit_rule_init = selinux_audit_rule_init, + .audit_rule_known = selinux_audit_rule_known, + .audit_rule_match = selinux_audit_rule_match, + .audit_rule_free = selinux_audit_rule_free, #endif }; static __init int selinux_init(void) { - struct task_security_struct *tsec; + if (!security_module_enable(&selinux_ops)) { + selinux_enabled = 0; + return 0; + } if (!selinux_enabled) { printk(KERN_INFO "SELinux: Disabled at boot.\n"); @@ -4906,68 +5981,38 @@ static __init int selinux_init(void) printk(KERN_INFO "SELinux: Initializing.\n"); /* Set the security state for the initial task. */ - if (task_alloc_security(current)) - panic("SELinux: Failed to initialize initial task.\n"); - tsec = current->security; - tsec->osid = tsec->sid = SECINITSID_KERNEL; + cred_init_security(); + + default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC); sel_inode_cache = kmem_cache_create("selinux_inode_security", sizeof(struct inode_security_struct), - 0, SLAB_PANIC, NULL, NULL); + 0, SLAB_PANIC, NULL); avc_init(); - original_ops = secondary_ops = security_ops; - if (!secondary_ops) - panic ("SELinux: No initial security operations\n"); - if (register_security (&selinux_ops)) + if (register_security(&selinux_ops)) panic("SELinux: Unable to register with kernel.\n"); - if (selinux_enforcing) { + if (selinux_enforcing) printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); - } else { + else printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); - } - -#ifdef CONFIG_KEYS - /* Add security information to initial keyrings */ - selinux_key_alloc(&root_user_keyring, current, - KEY_ALLOC_NOT_IN_QUOTA); - selinux_key_alloc(&root_session_keyring, current, - KEY_ALLOC_NOT_IN_QUOTA); -#endif return 0; } +static void delayed_superblock_init(struct super_block *sb, void *unused) +{ + superblock_doinit(sb, NULL); +} + void selinux_complete_init(void) { printk(KERN_DEBUG "SELinux: Completing initialization.\n"); /* Set up any superblocks initialized prior to the policy load. */ printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); - spin_lock(&sb_lock); - spin_lock(&sb_security_lock); -next_sb: - if (!list_empty(&superblock_security_head)) { - struct superblock_security_struct *sbsec = - list_entry(superblock_security_head.next, - struct superblock_security_struct, - list); - struct super_block *sb = sbsec->sb; - sb->s_count++; - spin_unlock(&sb_security_lock); - spin_unlock(&sb_lock); - down_read(&sb->s_umount); - if (sb->s_root) - superblock_doinit(sb, NULL); - drop_super(sb); - spin_lock(&sb_lock); - spin_lock(&sb_security_lock); - list_del_init(&sbsec->list); - goto next_sb; - } - spin_unlock(&sb_security_lock); - spin_unlock(&sb_lock); + iterate_supers(delayed_superblock_init, NULL); } /* SELinux requires early initialization in order to label @@ -4976,22 +6021,47 @@ security_initcall(selinux_init); #if defined(CONFIG_NETFILTER) -static struct nf_hook_ops selinux_ipv4_op = { - .hook = selinux_ipv4_postroute_last, - .owner = THIS_MODULE, - .pf = PF_INET, - .hooknum = NF_IP_POST_ROUTING, - .priority = NF_IP_PRI_SELINUX_LAST, +static struct nf_hook_ops selinux_ipv4_ops[] = { + { + .hook = selinux_ipv4_postroute, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP_PRI_SELINUX_LAST, + }, + { + .hook = selinux_ipv4_forward, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_FORWARD, + .priority = NF_IP_PRI_SELINUX_FIRST, + }, + { + .hook = selinux_ipv4_output, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_SELINUX_FIRST, + } }; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) -static struct nf_hook_ops selinux_ipv6_op = { - .hook = selinux_ipv6_postroute_last, - .owner = THIS_MODULE, - .pf = PF_INET6, - .hooknum = NF_IP6_POST_ROUTING, - .priority = NF_IP6_PRI_SELINUX_LAST, +static struct nf_hook_ops selinux_ipv6_ops[] = { + { + .hook = selinux_ipv6_postroute, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP6_PRI_SELINUX_LAST, + }, + { + .hook = selinux_ipv6_forward, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_FORWARD, + .priority = NF_IP6_PRI_SELINUX_FIRST, + } }; #endif /* IPV6 */ @@ -5005,16 +6075,14 @@ static int __init selinux_nf_ip_init(void) printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); - err = nf_register_hook(&selinux_ipv4_op); + err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); if (err) - panic("SELinux: nf_register_hook for IPv4: error %d\n", err); + panic("SELinux: nf_register_hooks for IPv4: error %d\n", err); #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) - - err = nf_register_hook(&selinux_ipv6_op); + err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); if (err) - panic("SELinux: nf_register_hook for IPv6: error %d\n", err); - + panic("SELinux: nf_register_hooks for IPv6: error %d\n", err); #endif /* IPV6 */ out: @@ -5028,9 +6096,9 @@ static void selinux_nf_ip_exit(void) { printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); - nf_unregister_hook(&selinux_ipv4_op); + nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) - nf_unregister_hook(&selinux_ipv6_op); + nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); #endif /* IPV6 */ } #endif @@ -5044,11 +6112,10 @@ static void selinux_nf_ip_exit(void) #endif /* CONFIG_NETFILTER */ #ifdef CONFIG_SECURITY_SELINUX_DISABLE +static int selinux_disabled; + int selinux_disable(void) { - extern void exit_sel_fs(void); - static int selinux_disabled = 0; - if (ss_initialized) { /* Not permitted after initial policy load. */ return -EINVAL; @@ -5064,8 +6131,10 @@ int selinux_disable(void) selinux_disabled = 1; selinux_enabled = 0; - /* Reset security_ops to the secondary module, dummy or capability. */ - security_ops = secondary_ops; + reset_security_ops(); + + /* Try to destroy the avc node cache */ + avc_disable(); /* Unregister netfilter hooks. */ selinux_nf_ip_exit(); @@ -5076,5 +6145,3 @@ int selinux_disable(void) return 0; } #endif - - |