// 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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#include <linux/lsm_hooks.h>
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#include "common.h"
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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_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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* @mnt: Pointer to "struct vfsmount".
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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_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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* @cred: Pointer to "struct cred".
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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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* @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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};
|
|
/* Lock for GC. */
|
DEFINE_SRCU(tomoyo_ss);
|
|
int tomoyo_enabled __lsm_ro_after_init = 1;
|
|
/**
|
* tomoyo_init - Register TOMOYO Linux as a LSM module.
|
*
|
* Returns 0.
|
*/
|
static int __init tomoyo_init(void)
|
{
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struct tomoyo_task *s = tomoyo_task(current);
|
|
/* register ourselves with the security framework */
|
security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
|
pr_info("TOMOYO Linux initialized\n");
|
s->domain_info = &tomoyo_kernel_domain;
|
atomic_inc(&tomoyo_kernel_domain.users);
|
s->old_domain_info = NULL;
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tomoyo_mm_init();
|
|
return 0;
|
}
|
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DEFINE_LSM(tomoyo) = {
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.name = "tomoyo",
|
.enabled = &tomoyo_enabled,
|
.flags = LSM_FLAG_LEGACY_MAJOR,
|
.blobs = &tomoyo_blob_sizes,
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.init = tomoyo_init,
|
};
|
