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592 lines
16 KiB
592 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* security/tomoyo/tomoyo.c |
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* |
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* Copyright (C) 2005-2011 NTT DATA CORPORATION |
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*/ |
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|
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#include <linux/lsm_hooks.h> |
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#include "common.h" |
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|
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/** |
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* tomoyo_domain - Get "struct tomoyo_domain_info" for current thread. |
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* |
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* Returns pointer to "struct tomoyo_domain_info" for current thread. |
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*/ |
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struct tomoyo_domain_info *tomoyo_domain(void) |
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{ |
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struct tomoyo_task *s = tomoyo_task(current); |
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if (s->old_domain_info && !current->in_execve) { |
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atomic_dec(&s->old_domain_info->users); |
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s->old_domain_info = NULL; |
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} |
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return s->domain_info; |
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} |
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/** |
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* tomoyo_cred_prepare - Target for security_prepare_creds(). |
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* |
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* @new: Pointer to "struct cred". |
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* @old: Pointer to "struct cred". |
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* @gfp: Memory allocation flags. |
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* |
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* Returns 0. |
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*/ |
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static int tomoyo_cred_prepare(struct cred *new, const struct cred *old, |
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gfp_t gfp) |
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{ |
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/* Restore old_domain_info saved by previous execve() request. */ |
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struct tomoyo_task *s = tomoyo_task(current); |
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if (s->old_domain_info && !current->in_execve) { |
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atomic_dec(&s->domain_info->users); |
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s->domain_info = s->old_domain_info; |
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s->old_domain_info = NULL; |
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} |
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return 0; |
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} |
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/** |
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* tomoyo_bprm_committed_creds - Target for security_bprm_committed_creds(). |
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* |
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* @bprm: Pointer to "struct linux_binprm". |
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*/ |
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static void tomoyo_bprm_committed_creds(struct linux_binprm *bprm) |
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{ |
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/* Clear old_domain_info saved by execve() request. */ |
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struct tomoyo_task *s = tomoyo_task(current); |
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atomic_dec(&s->old_domain_info->users); |
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s->old_domain_info = NULL; |
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} |
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#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER |
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/** |
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* tomoyo_bprm_creds_for_exec - Target for security_bprm_creds_for_exec(). |
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* |
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* @bprm: Pointer to "struct linux_binprm". |
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* |
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* Returns 0. |
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*/ |
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static int tomoyo_bprm_creds_for_exec(struct linux_binprm *bprm) |
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{ |
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/* |
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* Load policy if /sbin/tomoyo-init exists and /sbin/init is requested |
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* for the first time. |
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*/ |
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if (!tomoyo_policy_loaded) |
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tomoyo_load_policy(bprm->filename); |
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return 0; |
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} |
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#endif |
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/** |
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* tomoyo_bprm_check_security - Target for security_bprm_check(). |
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* |
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* @bprm: Pointer to "struct linux_binprm". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_bprm_check_security(struct linux_binprm *bprm) |
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{ |
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struct tomoyo_task *s = tomoyo_task(current); |
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/* |
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* Execute permission is checked against pathname passed to execve() |
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* using current domain. |
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*/ |
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if (!s->old_domain_info) { |
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const int idx = tomoyo_read_lock(); |
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const int err = tomoyo_find_next_domain(bprm); |
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tomoyo_read_unlock(idx); |
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return err; |
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} |
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/* |
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* Read permission is checked against interpreters using next domain. |
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*/ |
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return tomoyo_check_open_permission(s->domain_info, |
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&bprm->file->f_path, O_RDONLY); |
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} |
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/** |
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* tomoyo_inode_getattr - Target for security_inode_getattr(). |
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* |
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* @path: Pointer to "struct path". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_inode_getattr(const struct path *path) |
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{ |
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return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, path, NULL); |
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} |
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/** |
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* tomoyo_path_truncate - Target for security_path_truncate(). |
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* |
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* @path: Pointer to "struct path". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_truncate(const struct path *path) |
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{ |
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return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL); |
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} |
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/** |
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* tomoyo_path_unlink - Target for security_path_unlink(). |
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* |
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* @parent: Pointer to "struct path". |
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* @dentry: Pointer to "struct dentry". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry) |
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{ |
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struct path path = { .mnt = parent->mnt, .dentry = dentry }; |
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return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL); |
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} |
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/** |
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* tomoyo_path_mkdir - Target for security_path_mkdir(). |
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* |
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* @parent: Pointer to "struct path". |
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* @dentry: Pointer to "struct dentry". |
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* @mode: DAC permission mode. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, |
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umode_t mode) |
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{ |
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struct path path = { .mnt = parent->mnt, .dentry = dentry }; |
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return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path, |
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mode & S_IALLUGO); |
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} |
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/** |
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* tomoyo_path_rmdir - Target for security_path_rmdir(). |
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* |
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* @parent: Pointer to "struct path". |
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* @dentry: Pointer to "struct dentry". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry) |
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{ |
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struct path path = { .mnt = parent->mnt, .dentry = dentry }; |
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return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL); |
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} |
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/** |
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* tomoyo_path_symlink - Target for security_path_symlink(). |
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* |
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* @parent: Pointer to "struct path". |
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* @dentry: Pointer to "struct dentry". |
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* @old_name: Symlink's content. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry, |
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const char *old_name) |
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{ |
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struct path path = { .mnt = parent->mnt, .dentry = dentry }; |
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return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name); |
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} |
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/** |
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* tomoyo_path_mknod - Target for security_path_mknod(). |
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* |
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* @parent: Pointer to "struct path". |
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* @dentry: Pointer to "struct dentry". |
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* @mode: DAC permission mode. |
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* @dev: Device attributes. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry, |
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umode_t mode, unsigned int dev) |
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{ |
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struct path path = { .mnt = parent->mnt, .dentry = dentry }; |
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int type = TOMOYO_TYPE_CREATE; |
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const unsigned int perm = mode & S_IALLUGO; |
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switch (mode & S_IFMT) { |
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case S_IFCHR: |
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type = TOMOYO_TYPE_MKCHAR; |
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break; |
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case S_IFBLK: |
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type = TOMOYO_TYPE_MKBLOCK; |
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break; |
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default: |
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goto no_dev; |
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} |
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return tomoyo_mkdev_perm(type, &path, perm, dev); |
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no_dev: |
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switch (mode & S_IFMT) { |
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case S_IFIFO: |
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type = TOMOYO_TYPE_MKFIFO; |
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break; |
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case S_IFSOCK: |
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type = TOMOYO_TYPE_MKSOCK; |
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break; |
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} |
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return tomoyo_path_number_perm(type, &path, perm); |
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} |
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/** |
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* tomoyo_path_link - Target for security_path_link(). |
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* |
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* @old_dentry: Pointer to "struct dentry". |
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* @new_dir: Pointer to "struct path". |
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* @new_dentry: Pointer to "struct dentry". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_dir, |
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struct dentry *new_dentry) |
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{ |
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struct path path1 = { .mnt = new_dir->mnt, .dentry = old_dentry }; |
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struct path path2 = { .mnt = new_dir->mnt, .dentry = new_dentry }; |
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return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2); |
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} |
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/** |
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* tomoyo_path_rename - Target for security_path_rename(). |
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* |
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* @old_parent: Pointer to "struct path". |
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* @old_dentry: Pointer to "struct dentry". |
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* @new_parent: Pointer to "struct path". |
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* @new_dentry: Pointer to "struct dentry". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_rename(const struct path *old_parent, |
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struct dentry *old_dentry, |
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const struct path *new_parent, |
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struct dentry *new_dentry) |
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{ |
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struct path path1 = { .mnt = old_parent->mnt, .dentry = old_dentry }; |
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struct path path2 = { .mnt = new_parent->mnt, .dentry = new_dentry }; |
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return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2); |
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} |
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/** |
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* tomoyo_file_fcntl - Target for security_file_fcntl(). |
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* |
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* @file: Pointer to "struct file". |
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* @cmd: Command for fcntl(). |
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* @arg: Argument for @cmd. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))) |
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return 0; |
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return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path, |
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O_WRONLY | (arg & O_APPEND)); |
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} |
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/** |
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* tomoyo_file_open - Target for security_file_open(). |
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* |
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* @f: Pointer to "struct file". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_file_open(struct file *f) |
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{ |
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/* Don't check read permission here if called from execve(). */ |
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if (current->in_execve) |
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return 0; |
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return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, |
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f->f_flags); |
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} |
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/** |
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* tomoyo_file_ioctl - Target for security_file_ioctl(). |
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* |
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* @file: Pointer to "struct file". |
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* @cmd: Command for ioctl(). |
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* @arg: Argument for @cmd. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_file_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd); |
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} |
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/** |
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* tomoyo_path_chmod - Target for security_path_chmod(). |
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* |
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* @path: Pointer to "struct path". |
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* @mode: DAC permission mode. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_chmod(const struct path *path, umode_t mode) |
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{ |
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return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path, |
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mode & S_IALLUGO); |
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} |
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/** |
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* tomoyo_path_chown - Target for security_path_chown(). |
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* |
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* @path: Pointer to "struct path". |
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* @uid: Owner ID. |
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* @gid: Group ID. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
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{ |
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int error = 0; |
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if (uid_valid(uid)) |
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error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, |
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from_kuid(&init_user_ns, uid)); |
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if (!error && gid_valid(gid)) |
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error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, |
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from_kgid(&init_user_ns, gid)); |
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return error; |
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} |
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/** |
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* tomoyo_path_chroot - Target for security_path_chroot(). |
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* |
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* @path: Pointer to "struct path". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_path_chroot(const struct path *path) |
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{ |
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return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL); |
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} |
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/** |
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* tomoyo_sb_mount - Target for security_sb_mount(). |
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* |
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* @dev_name: Name of device file. Maybe NULL. |
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* @path: Pointer to "struct path". |
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* @type: Name of filesystem type. Maybe NULL. |
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* @flags: Mount options. |
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* @data: Optional data. Maybe NULL. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_sb_mount(const char *dev_name, const struct path *path, |
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const char *type, unsigned long flags, void *data) |
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{ |
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return tomoyo_mount_permission(dev_name, path, type, flags, data); |
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} |
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/** |
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* tomoyo_sb_umount - Target for security_sb_umount(). |
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* |
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* @mnt: Pointer to "struct vfsmount". |
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* @flags: Unmount options. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_sb_umount(struct vfsmount *mnt, int flags) |
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{ |
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struct path path = { .mnt = mnt, .dentry = mnt->mnt_root }; |
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return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL); |
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} |
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/** |
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* tomoyo_sb_pivotroot - Target for security_sb_pivotroot(). |
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* |
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* @old_path: Pointer to "struct path". |
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* @new_path: Pointer to "struct path". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_sb_pivotroot(const struct path *old_path, const struct path *new_path) |
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{ |
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return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path); |
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} |
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/** |
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* tomoyo_socket_listen - Check permission for listen(). |
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* |
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* @sock: Pointer to "struct socket". |
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* @backlog: Backlog parameter. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_socket_listen(struct socket *sock, int backlog) |
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{ |
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return tomoyo_socket_listen_permission(sock); |
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} |
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/** |
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* tomoyo_socket_connect - Check permission for connect(). |
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* |
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* @sock: Pointer to "struct socket". |
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* @addr: Pointer to "struct sockaddr". |
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* @addr_len: Size of @addr. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr, |
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int addr_len) |
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{ |
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return tomoyo_socket_connect_permission(sock, addr, addr_len); |
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} |
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/** |
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* tomoyo_socket_bind - Check permission for bind(). |
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* |
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* @sock: Pointer to "struct socket". |
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* @addr: Pointer to "struct sockaddr". |
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* @addr_len: Size of @addr. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr, |
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int addr_len) |
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{ |
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return tomoyo_socket_bind_permission(sock, addr, addr_len); |
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} |
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/** |
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* tomoyo_socket_sendmsg - Check permission for sendmsg(). |
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* |
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* @sock: Pointer to "struct socket". |
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* @msg: Pointer to "struct msghdr". |
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* @size: Size of message. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
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int size) |
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{ |
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return tomoyo_socket_sendmsg_permission(sock, msg, size); |
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} |
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struct lsm_blob_sizes tomoyo_blob_sizes __lsm_ro_after_init = { |
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.lbs_task = sizeof(struct tomoyo_task), |
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}; |
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/** |
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* tomoyo_task_alloc - Target for security_task_alloc(). |
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* |
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* @task: Pointer to "struct task_struct". |
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* @clone_flags: clone() flags. |
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* |
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* Returns 0. |
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*/ |
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static int tomoyo_task_alloc(struct task_struct *task, |
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unsigned long clone_flags) |
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{ |
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struct tomoyo_task *old = tomoyo_task(current); |
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struct tomoyo_task *new = tomoyo_task(task); |
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new->domain_info = old->domain_info; |
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atomic_inc(&new->domain_info->users); |
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new->old_domain_info = NULL; |
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return 0; |
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} |
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/** |
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* tomoyo_task_free - Target for security_task_free(). |
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* |
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* @task: Pointer to "struct task_struct". |
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*/ |
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static void tomoyo_task_free(struct task_struct *task) |
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{ |
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struct tomoyo_task *s = tomoyo_task(task); |
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if (s->domain_info) { |
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atomic_dec(&s->domain_info->users); |
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s->domain_info = NULL; |
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} |
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if (s->old_domain_info) { |
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atomic_dec(&s->old_domain_info->users); |
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s->old_domain_info = NULL; |
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} |
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} |
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/* |
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* tomoyo_security_ops is a "struct security_operations" which is used for |
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* registering TOMOYO. |
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*/ |
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static struct security_hook_list tomoyo_hooks[] __lsm_ro_after_init = { |
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LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare), |
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LSM_HOOK_INIT(bprm_committed_creds, tomoyo_bprm_committed_creds), |
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LSM_HOOK_INIT(task_alloc, tomoyo_task_alloc), |
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LSM_HOOK_INIT(task_free, tomoyo_task_free), |
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#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER |
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LSM_HOOK_INIT(bprm_creds_for_exec, tomoyo_bprm_creds_for_exec), |
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#endif |
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LSM_HOOK_INIT(bprm_check_security, tomoyo_bprm_check_security), |
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LSM_HOOK_INIT(file_fcntl, tomoyo_file_fcntl), |
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LSM_HOOK_INIT(file_open, tomoyo_file_open), |
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LSM_HOOK_INIT(path_truncate, tomoyo_path_truncate), |
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LSM_HOOK_INIT(path_unlink, tomoyo_path_unlink), |
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LSM_HOOK_INIT(path_mkdir, tomoyo_path_mkdir), |
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LSM_HOOK_INIT(path_rmdir, tomoyo_path_rmdir), |
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LSM_HOOK_INIT(path_symlink, tomoyo_path_symlink), |
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LSM_HOOK_INIT(path_mknod, tomoyo_path_mknod), |
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LSM_HOOK_INIT(path_link, tomoyo_path_link), |
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LSM_HOOK_INIT(path_rename, tomoyo_path_rename), |
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LSM_HOOK_INIT(inode_getattr, tomoyo_inode_getattr), |
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LSM_HOOK_INIT(file_ioctl, tomoyo_file_ioctl), |
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LSM_HOOK_INIT(path_chmod, tomoyo_path_chmod), |
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LSM_HOOK_INIT(path_chown, tomoyo_path_chown), |
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LSM_HOOK_INIT(path_chroot, tomoyo_path_chroot), |
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LSM_HOOK_INIT(sb_mount, tomoyo_sb_mount), |
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LSM_HOOK_INIT(sb_umount, tomoyo_sb_umount), |
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LSM_HOOK_INIT(sb_pivotroot, tomoyo_sb_pivotroot), |
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LSM_HOOK_INIT(socket_bind, tomoyo_socket_bind), |
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LSM_HOOK_INIT(socket_connect, tomoyo_socket_connect), |
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LSM_HOOK_INIT(socket_listen, tomoyo_socket_listen), |
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LSM_HOOK_INIT(socket_sendmsg, tomoyo_socket_sendmsg), |
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}; |
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/* Lock for GC. */ |
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DEFINE_SRCU(tomoyo_ss); |
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|
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int tomoyo_enabled __lsm_ro_after_init = 1; |
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|
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/** |
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* tomoyo_init - Register TOMOYO Linux as a LSM module. |
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* |
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* Returns 0. |
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*/ |
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static int __init tomoyo_init(void) |
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{ |
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struct tomoyo_task *s = tomoyo_task(current); |
|
|
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/* register ourselves with the security framework */ |
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security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo"); |
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pr_info("TOMOYO Linux initialized\n"); |
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s->domain_info = &tomoyo_kernel_domain; |
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atomic_inc(&tomoyo_kernel_domain.users); |
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s->old_domain_info = NULL; |
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tomoyo_mm_init(); |
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|
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return 0; |
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} |
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|
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DEFINE_LSM(tomoyo) = { |
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.name = "tomoyo", |
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.enabled = &tomoyo_enabled, |
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.flags = LSM_FLAG_LEGACY_MAJOR, |
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.blobs = &tomoyo_blob_sizes, |
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.init = tomoyo_init, |
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};
|
|
|