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-rw-r--r--security/tomoyo/tomoyo.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
new file mode 100644
index 00000000000..f3ab20758c0
--- /dev/null
+++ b/security/tomoyo/tomoyo.c
@@ -0,0 +1,293 @@
+/*
+ * security/tomoyo/tomoyo.c
+ *
+ * LSM hooks for TOMOYO Linux.
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ *
+ * Version: 2.2.0-pre 2009/02/01
+ *
+ */
+
+#include <linux/security.h>
+#include "common.h"
+#include "tomoyo.h"
+#include "realpath.h"
+
+static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ /*
+ * Since "struct tomoyo_domain_info *" is a sharable pointer,
+ * we don't need to duplicate.
+ */
+ new->security = old->security;
+ return 0;
+}
+
+static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
+{
+ /*
+ * Do only if this function is called for the first time of an execve
+ * operation.
+ */
+ if (bprm->cred_prepared)
+ return 0;
+ /*
+ * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
+ * for the first time.
+ */
+ if (!tomoyo_policy_loaded)
+ tomoyo_load_policy(bprm->filename);
+ /*
+ * Tell tomoyo_bprm_check_security() is called for the first time of an
+ * execve operation.
+ */
+ bprm->cred->security = NULL;
+ return 0;
+}
+
+static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
+{
+ struct tomoyo_domain_info *domain = bprm->cred->security;
+
+ /*
+ * Execute permission is checked against pathname passed to do_execve()
+ * using current domain.
+ */
+ if (!domain) {
+ struct tomoyo_domain_info *next_domain = NULL;
+ int retval = tomoyo_find_next_domain(bprm, &next_domain);
+
+ if (!retval)
+ bprm->cred->security = next_domain;
+ return retval;
+ }
+ /*
+ * Read permission is checked against interpreters using next domain.
+ * '1' is the result of open_to_namei_flags(O_RDONLY).
+ */
+ return tomoyo_check_open_permission(domain, &bprm->file->f_path, 1);
+}
+
+#ifdef CONFIG_SYSCTL
+
+static int tomoyo_prepend(char **buffer, int *buflen, const char *str)
+{
+ int namelen = strlen(str);
+
+ if (*buflen < namelen)
+ return -ENOMEM;
+ *buflen -= namelen;
+ *buffer -= namelen;
+ memcpy(*buffer, str, namelen);
+ return 0;
+}
+
+/**
+ * tomoyo_sysctl_path - return the realpath of a ctl_table.
+ * @table: pointer to "struct ctl_table".
+ *
+ * Returns realpath(3) of the @table on success.
+ * Returns NULL on failure.
+ *
+ * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
+ * if this function didn't return NULL.
+ */
+static char *tomoyo_sysctl_path(struct ctl_table *table)
+{
+ int buflen = TOMOYO_MAX_PATHNAME_LEN;
+ char *buf = tomoyo_alloc(buflen);
+ char *end = buf + buflen;
+ int error = -ENOMEM;
+
+ if (!buf)
+ return NULL;
+
+ *--end = '\0';
+ buflen--;
+ while (table) {
+ char buf[32];
+ const char *sp = table->procname;
+
+ if (!sp) {
+ memset(buf, 0, sizeof(buf));
+ snprintf(buf, sizeof(buf) - 1, "=%d=", table->ctl_name);
+ sp = buf;
+ }
+ if (tomoyo_prepend(&end, &buflen, sp) ||
+ tomoyo_prepend(&end, &buflen, "/"))
+ goto out;
+ table = table->parent;
+ }
+ if (tomoyo_prepend(&end, &buflen, "/proc/sys"))
+ goto out;
+ error = tomoyo_encode(buf, end - buf, end);
+ out:
+ if (!error)
+ return buf;
+ tomoyo_free(buf);
+ return NULL;
+}
+
+static int tomoyo_sysctl(struct ctl_table *table, int op)
+{
+ int error;
+ char *name;
+
+ op &= MAY_READ | MAY_WRITE;
+ if (!op)
+ return 0;
+ name = tomoyo_sysctl_path(table);
+ if (!name)
+ return -ENOMEM;
+ error = tomoyo_check_file_perm(tomoyo_domain(), name, op);
+ tomoyo_free(name);
+ return error;
+}
+#endif
+
+static int tomoyo_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs)
+{
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_TRUNCATE_ACL,
+ path);
+}
+
+static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_UNLINK_ACL,
+ &path);
+}
+
+static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
+ int mode)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_MKDIR_ACL,
+ &path);
+}
+
+static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_RMDIR_ACL,
+ &path);
+}
+
+static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
+ const char *old_name)
+{
+ struct path path = { parent->mnt, dentry };
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_SYMLINK_ACL,
+ &path);
+}
+
+static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
+ int mode, unsigned int dev)
+{
+ struct path path = { parent->mnt, dentry };
+ int type = TOMOYO_TYPE_CREATE_ACL;
+
+ switch (mode & S_IFMT) {
+ case S_IFCHR:
+ type = TOMOYO_TYPE_MKCHAR_ACL;
+ break;
+ case S_IFBLK:
+ type = TOMOYO_TYPE_MKBLOCK_ACL;
+ break;
+ case S_IFIFO:
+ type = TOMOYO_TYPE_MKFIFO_ACL;
+ break;
+ case S_IFSOCK:
+ type = TOMOYO_TYPE_MKSOCK_ACL;
+ break;
+ }
+ return tomoyo_check_1path_perm(tomoyo_domain(),
+ type, &path);
+}
+
+static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ struct path path1 = { new_dir->mnt, old_dentry };
+ struct path path2 = { new_dir->mnt, new_dentry };
+ return tomoyo_check_2path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_LINK_ACL,
+ &path1, &path2);
+}
+
+static int tomoyo_path_rename(struct path *old_parent,
+ struct dentry *old_dentry,
+ struct path *new_parent,
+ struct dentry *new_dentry)
+{
+ struct path path1 = { old_parent->mnt, old_dentry };
+ struct path path2 = { new_parent->mnt, new_dentry };
+ return tomoyo_check_2path_perm(tomoyo_domain(),
+ TOMOYO_TYPE_RENAME_ACL,
+ &path1, &path2);
+}
+
+static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ if (cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))
+ return tomoyo_check_rewrite_permission(tomoyo_domain(), file);
+ return 0;
+}
+
+static int tomoyo_dentry_open(struct file *f, const struct cred *cred)
+{
+ int flags = f->f_flags;
+
+ if ((flags + 1) & O_ACCMODE)
+ flags++;
+ flags |= f->f_flags & (O_APPEND | O_TRUNC);
+ /* Don't check read permission here if called from do_execve(). */
+ if (current->in_execve)
+ return 0;
+ return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
+}
+
+static struct security_operations tomoyo_security_ops = {
+ .name = "tomoyo",
+ .cred_prepare = tomoyo_cred_prepare,
+ .bprm_set_creds = tomoyo_bprm_set_creds,
+ .bprm_check_security = tomoyo_bprm_check_security,
+#ifdef CONFIG_SYSCTL
+ .sysctl = tomoyo_sysctl,
+#endif
+ .file_fcntl = tomoyo_file_fcntl,
+ .dentry_open = tomoyo_dentry_open,
+ .path_truncate = tomoyo_path_truncate,
+ .path_unlink = tomoyo_path_unlink,
+ .path_mkdir = tomoyo_path_mkdir,
+ .path_rmdir = tomoyo_path_rmdir,
+ .path_symlink = tomoyo_path_symlink,
+ .path_mknod = tomoyo_path_mknod,
+ .path_link = tomoyo_path_link,
+ .path_rename = tomoyo_path_rename,
+};
+
+static int __init tomoyo_init(void)
+{
+ struct cred *cred = (struct cred *) current_cred();
+
+ if (!security_module_enable(&tomoyo_security_ops))
+ return 0;
+ /* register ourselves with the security framework */
+ if (register_security(&tomoyo_security_ops))
+ panic("Failure registering TOMOYO Linux");
+ printk(KERN_INFO "TOMOYO Linux initialized\n");
+ cred->security = &tomoyo_kernel_domain;
+ return 0;
+}
+
+security_initcall(tomoyo_init);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-21 01:59:44 +0000