diff options
| -rw-r--r-- | security/selinux/Kconfig | 2 | ||||
| -rw-r--r-- | security/selinux/include/security.h | 15 | ||||
| -rw-r--r-- | security/selinux/selinuxfs.c | 89 | ||||
| -rw-r--r-- | security/selinux/ss/policydb.c | 18 | ||||
| -rw-r--r-- | security/selinux/ss/policydb.h | 2 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 67 |
6 files changed, 185 insertions, 8 deletions
diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig index b32a459c068..2b517d61867 100644 --- a/security/selinux/Kconfig +++ b/security/selinux/Kconfig @@ -145,7 +145,7 @@ config SECURITY_SELINUX_POLICYDB_VERSION_MAX config SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE int "NSA SELinux maximum supported policy format version value" depends on SECURITY_SELINUX_POLICYDB_VERSION_MAX - range 15 21 + range 15 22 default 19 help This option sets the value for the maximum policy format version diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index a33437bba93..a22de977180 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -25,13 +25,14 @@ #define POLICYDB_VERSION_MLS 19 #define POLICYDB_VERSION_AVTAB 20 #define POLICYDB_VERSION_RANGETRANS 21 +#define POLICYDB_VERSION_POLCAP 22 /* Range of policy versions we understand*/ #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX #define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE #else -#define POLICYDB_VERSION_MAX POLICYDB_VERSION_RANGETRANS +#define POLICYDB_VERSION_MAX POLICYDB_VERSION_POLCAP #endif struct netlbl_lsm_secattr; @@ -39,8 +40,19 @@ struct netlbl_lsm_secattr; extern int selinux_enabled; extern int selinux_mls_enabled; +/* Policy capabilities */ +enum { + POLICYDB_CAPABILITY_NETPEER, + __POLICYDB_CAPABILITY_MAX +}; +#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1) + +extern int selinux_policycap_netpeer; + int security_load_policy(void * data, size_t len); +int security_policycap_supported(unsigned int req_cap); + #define SEL_VEC_MAX 32 struct av_decision { u32 allowed; @@ -91,6 +103,7 @@ int security_get_classes(char ***classes, int *nclasses); int security_get_permissions(char *class, char ***perms, int *nperms); int security_get_reject_unknown(void); int security_get_allow_unknown(void); +int security_get_policycaps(int *len, int **values); #define SECURITY_FS_USE_XATTR 1 /* use xattr */ #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 397fd4955fe..a85740530af 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -2,6 +2,11 @@ * * Added conditional policy language extensions * + * Updated: Hewlett-Packard <paul.moore@hp.com> + * + * Added support for the policy capability bitmap + * + * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2003 - 2004 Tresys Technology, LLC * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> * This program is free software; you can redistribute it and/or modify @@ -35,6 +40,11 @@ #include "objsec.h" #include "conditional.h" +/* Policy capability filenames */ +static char *policycap_names[] = { + "network_peer_controls" +}; + unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT @@ -72,6 +82,9 @@ static int *bool_pending_values = NULL; static struct dentry *class_dir = NULL; static unsigned long last_class_ino; +/* global data for policy capabilities */ +static struct dentry *policycap_dir = NULL; + extern void selnl_notify_setenforce(int val); /* Check whether a task is allowed to use a security operation. */ @@ -111,10 +124,11 @@ enum sel_inos { static unsigned long sel_last_ino = SEL_INO_NEXT - 1; -#define SEL_INITCON_INO_OFFSET 0x01000000 -#define SEL_BOOL_INO_OFFSET 0x02000000 -#define SEL_CLASS_INO_OFFSET 0x04000000 -#define SEL_INO_MASK 0x00ffffff +#define SEL_INITCON_INO_OFFSET 0x01000000 +#define SEL_BOOL_INO_OFFSET 0x02000000 +#define SEL_CLASS_INO_OFFSET 0x04000000 +#define SEL_POLICYCAP_INO_OFFSET 0x08000000 +#define SEL_INO_MASK 0x00ffffff #define TMPBUFLEN 12 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, @@ -263,6 +277,7 @@ static const struct file_operations sel_policyvers_ops = { /* declaration for sel_write_load */ static int sel_make_bools(void); static int sel_make_classes(void); +static int sel_make_policycap(void); /* declaration for sel_make_class_dirs */ static int sel_make_dir(struct inode *dir, struct dentry *dentry, @@ -323,6 +338,12 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf, } ret = sel_make_classes(); + if (ret) { + length = ret; + goto out1; + } + + ret = sel_make_policycap(); if (ret) length = ret; else @@ -1399,6 +1420,24 @@ static const struct file_operations sel_perm_ops = { .read = sel_read_perm, }; +static ssize_t sel_read_policycap(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int value; + char tmpbuf[TMPBUFLEN]; + ssize_t length; + unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; + + value = security_policycap_supported(i_ino & SEL_INO_MASK); + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); + + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_policycap_ops = { + .read = sel_read_policycap, +}; + static int sel_make_perm_files(char *objclass, int classvalue, struct dentry *dir) { @@ -1545,6 +1584,36 @@ out: return rc; } +static int sel_make_policycap(void) +{ + unsigned int iter; + struct dentry *dentry = NULL; + struct inode *inode = NULL; + + sel_remove_entries(policycap_dir); + + for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { + if (iter < ARRAY_SIZE(policycap_names)) + dentry = d_alloc_name(policycap_dir, + policycap_names[iter]); + else + dentry = d_alloc_name(policycap_dir, "unknown"); + + if (dentry == NULL) + return -ENOMEM; + + inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); + if (inode == NULL) + return -ENOMEM; + + inode->i_fop = &sel_policycap_ops; + inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; + d_add(dentry, inode); + } + + return 0; +} + static int sel_make_dir(struct inode *dir, struct dentry *dentry, unsigned long *ino) { @@ -1673,6 +1742,18 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) class_dir = dentry; + dentry = d_alloc_name(sb->s_root, "policy_capabilities"); + if (!dentry) { + ret = -ENOMEM; + goto err; + } + + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); + if (ret) + goto err; + + policycap_dir = dentry; + out: return ret; err: diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index b582aae3c62..bd7d6a00342 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -13,6 +13,11 @@ * * Added conditional policy language extensions * + * Updated: Hewlett-Packard <paul.moore@hp.com> + * + * Added support for the policy capability bitmap + * + * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. * Copyright (C) 2003 - 2004 Tresys Technology, LLC * This program is free software; you can redistribute it and/or modify @@ -102,6 +107,11 @@ static struct policydb_compat_info policydb_compat[] = { .sym_num = SYM_NUM, .ocon_num = OCON_NUM, }, + { + .version = POLICYDB_VERSION_POLCAP, + .sym_num = SYM_NUM, + .ocon_num = OCON_NUM, + } }; static struct policydb_compat_info *policydb_lookup_compat(int version) @@ -183,6 +193,8 @@ static int policydb_init(struct policydb *p) if (rc) goto out_free_symtab; + ebitmap_init(&p->policycaps); + out: return rc; @@ -673,8 +685,8 @@ void policydb_destroy(struct policydb *p) ebitmap_destroy(&p->type_attr_map[i]); } kfree(p->type_attr_map); - kfree(p->undefined_perms); + ebitmap_destroy(&p->policycaps); return; } @@ -1554,6 +1566,10 @@ int policydb_read(struct policydb *p, void *fp) p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN); p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN); + if (p->policyvers >= POLICYDB_VERSION_POLCAP && + ebitmap_read(&p->policycaps, fp) != 0) + goto bad; + info = policydb_lookup_compat(p->policyvers); if (!info) { printk(KERN_ERR "security: unable to find policy compat info " diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index ed6fc687c66..c4ce996e202 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -241,6 +241,8 @@ struct policydb { /* type -> attribute reverse mapping */ struct ebitmap *type_attr_map; + struct ebitmap policycaps; + unsigned int policyvers; unsigned int reject_unknown : 1; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 8dfaa3e7c26..8ee04a424df 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -16,12 +16,13 @@ * Updated: Hewlett-Packard <paul.moore@hp.com> * * Added support for NetLabel + * Added support for the policy capability bitmap * * Updated: Chad Sellers <csellers@tresys.com> * * Added validation of kernel classes and permissions * - * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. + * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> @@ -59,6 +60,8 @@ extern void selnl_notify_policyload(u32 seqno); unsigned int policydb_loaded_version; +int selinux_policycap_netpeer; + /* * This is declared in avc.c */ @@ -1299,6 +1302,12 @@ bad: goto out; } +static void security_load_policycaps(void) +{ + selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, + POLICYDB_CAPABILITY_NETPEER); +} + extern void selinux_complete_init(void); static int security_preserve_bools(struct policydb *p); @@ -1346,6 +1355,7 @@ int security_load_policy(void *data, size_t len) avtab_cache_destroy(); return -EINVAL; } + security_load_policycaps(); policydb_loaded_version = policydb.policyvers; ss_initialized = 1; seqno = ++latest_granting; @@ -1404,6 +1414,7 @@ int security_load_policy(void *data, size_t len) POLICY_WRLOCK; memcpy(&policydb, &newpolicydb, sizeof policydb); sidtab_set(&sidtab, &newsidtab); + security_load_policycaps(); seqno = ++latest_granting; policydb_loaded_version = policydb.policyvers; POLICY_WRUNLOCK; @@ -2148,6 +2159,60 @@ int security_get_allow_unknown(void) return policydb.allow_unknown; } +/** + * security_get_policycaps - Query the loaded policy for its capabilities + * @len: the number of capability bits + * @values: the capability bit array + * + * Description: + * Get an array of the policy capabilities in @values where each entry in + * @values is either true (1) or false (0) depending the policy's support of + * that feature. The policy capabilities are defined by the + * POLICYDB_CAPABILITY_* enums. The size of the array is stored in @len and it + * is up to the caller to free the array in @values. Returns zero on success, + * negative values on failure. + * + */ +int security_get_policycaps(int *len, int **values) +{ + int rc = -ENOMEM; + unsigned int iter; + + POLICY_RDLOCK; + + *values = kcalloc(POLICYDB_CAPABILITY_MAX, sizeof(int), GFP_ATOMIC); + if (*values == NULL) + goto out; + for (iter = 0; iter < POLICYDB_CAPABILITY_MAX; iter++) + (*values)[iter] = ebitmap_get_bit(&policydb.policycaps, iter); + *len = POLICYDB_CAPABILITY_MAX; + +out: + POLICY_RDUNLOCK; + return rc; +} + +/** + * security_policycap_supported - Check for a specific policy capability + * @req_cap: capability + * + * Description: + * This function queries the currently loaded policy to see if it supports the + * capability specified by @req_cap. Returns true (1) if the capability is + * supported, false (0) if it isn't supported. + * + */ +int security_policycap_supported(unsigned int req_cap) +{ + int rc; + + POLICY_RDLOCK; + rc = ebitmap_get_bit(&policydb.policycaps, req_cap); + POLICY_RDUNLOCK; + + return rc; +} + struct selinux_audit_rule { u32 au_seqno; struct context au_ctxt; |