[deliverable/linux.git] / security / tomoyo / tomoyo.c

/*
 * security/tomoyo/tomoyo.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

#include <linux/security.h>
#include "common.h"

/**
 * tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
 *
 * @new: Pointer to "struct cred".
 * @gfp: Memory allocation flags.
 *
 * Returns 0.
 */
static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
{
	new->security = NULL;
	return 0;
}

/**
 * tomoyo_cred_prepare - Target for security_prepare_creds().
 *
 * @new: Pointer to "struct cred".
 * @old: Pointer to "struct cred".
 * @gfp: Memory allocation flags.
 *
 * Returns 0.
 */
static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
			       gfp_t gfp)
{
	struct tomoyo_domain_info *domain = old->security;
	new->security = domain;
	if (domain)
		atomic_inc(&domain->users);
	return 0;
}

/**
 * tomoyo_cred_transfer - Target for security_transfer_creds().
 *
 * @new: Pointer to "struct cred".
 * @old: Pointer to "struct cred".
 */
static void tomoyo_cred_transfer(struct cred *new, const struct cred *old)
{
	tomoyo_cred_prepare(new, old, 0);
}

/**
 * tomoyo_cred_free - Target for security_cred_free().
 *
 * @cred: Pointer to "struct cred".
 */
static void tomoyo_cred_free(struct cred *cred)
{
	struct tomoyo_domain_info *domain = cred->security;
	if (domain)
		atomic_dec(&domain->users);
}

/**
 * tomoyo_bprm_set_creds - Target for security_bprm_set_creds().
 *
 * @bprm: Pointer to "struct linux_binprm".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
{
	int rc;

	rc = cap_bprm_set_creds(bprm);
	if (rc)
		return rc;

	/*
	 * Do only if this function is called for the first time of an execve
	 * operation.
	 */
	if (bprm->cred_prepared)
		return 0;
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
	/*
	 * 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);
#endif
	/*
	 * Release reference to "struct tomoyo_domain_info" stored inside
	 * "bprm->cred->security". New reference to "struct tomoyo_domain_info"
	 * stored inside "bprm->cred->security" will be acquired later inside
	 * tomoyo_find_next_domain().
	 */
	atomic_dec(&((struct tomoyo_domain_info *)
		     bprm->cred->security)->users);
	/*
	 * Tell tomoyo_bprm_check_security() is called for the first time of an
	 * execve operation.
	 */
	bprm->cred->security = NULL;
	return 0;
}

/**
 * tomoyo_bprm_check_security - Target for security_bprm_check().
 *
 * @bprm: Pointer to "struct linux_binprm".
 *
 * Returns 0 on success, negative value otherwise.
 */
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) {
		const int idx = tomoyo_read_lock();
		const int err = tomoyo_find_next_domain(bprm);
		tomoyo_read_unlock(idx);
		return err;
	}
	/*
	 * Read permission is checked against interpreters using next domain.
	 */
	return tomoyo_check_open_permission(domain, &bprm->file->f_path,
					    O_RDONLY);
}

/**
 * tomoyo_inode_getattr - Target for security_inode_getattr().
 *
 * @mnt:    Pointer to "struct vfsmount".
 * @dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{
	struct path path = { mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
}

/**
 * tomoyo_path_truncate - Target for security_path_truncate().
 *
 * @path: Pointer to "struct path".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_truncate(struct path *path)
{
	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
}

/**
 * tomoyo_path_unlink - Target for security_path_unlink().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
}

/**
 * tomoyo_path_mkdir - Target for security_path_mkdir().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 * @mode:   DAC permission mode.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
			     umode_t mode)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
				       mode & S_IALLUGO);
}

/**
 * tomoyo_path_rmdir - Target for security_path_rmdir().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
}

/**
 * tomoyo_path_symlink - Target for security_path_symlink().
 *
 * @parent:   Pointer to "struct path".
 * @dentry:   Pointer to "struct dentry".
 * @old_name: Symlink's content.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
			       const char *old_name)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
}

/**
 * tomoyo_path_mknod - Target for security_path_mknod().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 * @mode:   DAC permission mode.
 * @dev:    Device attributes.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
			     umode_t mode, unsigned int dev)
{
	struct path path = { parent->mnt, dentry };
	int type = TOMOYO_TYPE_CREATE;
	const unsigned int perm = mode & S_IALLUGO;

	switch (mode & S_IFMT) {
	case S_IFCHR:
		type = TOMOYO_TYPE_MKCHAR;
		break;
	case S_IFBLK:
		type = TOMOYO_TYPE_MKBLOCK;
		break;
	default:
		goto no_dev;
	}
	return tomoyo_mkdev_perm(type, &path, perm, dev);
 no_dev:
	switch (mode & S_IFMT) {
	case S_IFIFO:
		type = TOMOYO_TYPE_MKFIFO;
		break;
	case S_IFSOCK:
		type = TOMOYO_TYPE_MKSOCK;
		break;
	}
	return tomoyo_path_number_perm(type, &path, perm);
}

/**
 * tomoyo_path_link - Target for security_path_link().
 *
 * @old_dentry: Pointer to "struct dentry".
 * @new_dir:    Pointer to "struct path".
 * @new_dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
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_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
}

/**
 * tomoyo_path_rename - Target for security_path_rename().
 *
 * @old_parent: Pointer to "struct path".
 * @old_dentry: Pointer to "struct dentry".
 * @new_parent: Pointer to "struct path".
 * @new_dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
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_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
}

/**
 * tomoyo_file_fcntl - Target for security_file_fcntl().
 *
 * @file: Pointer to "struct file".
 * @cmd:  Command for fcntl().
 * @arg:  Argument for @cmd.
 *
 * Returns 0 on success, negative value otherwise.
 */
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 0;
	return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
					    O_WRONLY | (arg & O_APPEND));
}

/**
 * tomoyo_file_open - Target for security_file_open().
 *
 * @f:    Pointer to "struct file".
 * @cred: Pointer to "struct cred".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_file_open(struct file *f, const struct cred *cred)
{
	int flags = f->f_flags;
	/* 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);
}

/**
 * tomoyo_file_ioctl - Target for security_file_ioctl().
 *
 * @file: Pointer to "struct file".
 * @cmd:  Command for ioctl().
 * @arg:  Argument for @cmd.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
}

/**
 * tomoyo_path_chmod - Target for security_path_chmod().
 *
 * @path: Pointer to "struct path".
 * @mode: DAC permission mode.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_chmod(struct path *path, umode_t mode)
{
	return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path,
				       mode & S_IALLUGO);
}

/**
 * tomoyo_path_chown - Target for security_path_chown().
 *
 * @path: Pointer to "struct path".
 * @uid:  Owner ID.
 * @gid:  Group ID.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
{
	int error = 0;
	if (uid != (uid_t) -1)
		error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, uid);
	if (!error && gid != (gid_t) -1)
		error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, gid);
	return error;
}

/**
 * tomoyo_path_chroot - Target for security_path_chroot().
 *
 * @path: Pointer to "struct path".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_chroot(struct path *path)
{
	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
}

/**
 * tomoyo_sb_mount - Target for security_sb_mount().
 *
 * @dev_name: Name of device file. Maybe NULL.
 * @path:     Pointer to "struct path".
 * @type:     Name of filesystem type. Maybe NULL.
 * @flags:    Mount options.
 * @data:     Optional data. Maybe NULL.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_sb_mount(char *dev_name, struct path *path,
			   char *type, unsigned long flags, void *data)
{
	return tomoyo_mount_permission(dev_name, path, type, flags, data);
}

/**
 * tomoyo_sb_umount - Target for security_sb_umount().
 *
 * @mnt:   Pointer to "struct vfsmount".
 * @flags: Unmount options.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
{
	struct path path = { mnt, mnt->mnt_root };
	return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
}

/**
 * tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
 *
 * @old_path: Pointer to "struct path".
 * @new_path: Pointer to "struct path".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
{
	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
}

/**
 * tomoyo_socket_listen - Check permission for listen().
 *
 * @sock:    Pointer to "struct socket".
 * @backlog: Backlog parameter.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_socket_listen(struct socket *sock, int backlog)
{
	return tomoyo_socket_listen_permission(sock);
}

/**
 * tomoyo_socket_connect - Check permission for connect().
 *
 * @sock:     Pointer to "struct socket".
 * @addr:     Pointer to "struct sockaddr".
 * @addr_len: Size of @addr.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr,
				 int addr_len)
{
	return tomoyo_socket_connect_permission(sock, addr, addr_len);
}

/**
 * tomoyo_socket_bind - Check permission for bind().
 *
 * @sock:     Pointer to "struct socket".
 * @addr:     Pointer to "struct sockaddr".
 * @addr_len: Size of @addr.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr,
			      int addr_len)
{
	return tomoyo_socket_bind_permission(sock, addr, addr_len);
}

/**
 * tomoyo_socket_sendmsg - Check permission for sendmsg().
 *
 * @sock: Pointer to "struct socket".
 * @msg:  Pointer to "struct msghdr".
 * @size: Size of message.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg,
				 int size)
{
	return tomoyo_socket_sendmsg_permission(sock, msg, size);
}

/*
 * tomoyo_security_ops is a "struct security_operations" which is used for
 * registering TOMOYO.
 */
static struct security_operations tomoyo_security_ops = {
	.name                = "tomoyo",
	.cred_alloc_blank    = tomoyo_cred_alloc_blank,
	.cred_prepare        = tomoyo_cred_prepare,
	.cred_transfer	     = tomoyo_cred_transfer,
	.cred_free           = tomoyo_cred_free,
	.bprm_set_creds      = tomoyo_bprm_set_creds,
	.bprm_check_security = tomoyo_bprm_check_security,
	.file_fcntl          = tomoyo_file_fcntl,
	.file_open           = tomoyo_file_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,
	.inode_getattr       = tomoyo_inode_getattr,
	.file_ioctl          = tomoyo_file_ioctl,
	.path_chmod          = tomoyo_path_chmod,
	.path_chown          = tomoyo_path_chown,
	.path_chroot         = tomoyo_path_chroot,
	.sb_mount            = tomoyo_sb_mount,
	.sb_umount           = tomoyo_sb_umount,
	.sb_pivotroot        = tomoyo_sb_pivotroot,
	.socket_bind         = tomoyo_socket_bind,
	.socket_connect      = tomoyo_socket_connect,
	.socket_listen       = tomoyo_socket_listen,
	.socket_sendmsg      = tomoyo_socket_sendmsg,
};

/* Lock for GC. */
struct srcu_struct tomoyo_ss;

/**
 * tomoyo_init - Register TOMOYO Linux as a LSM module.
 *
 * Returns 0.
 */
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) ||
	    init_srcu_struct(&tomoyo_ss))
		panic("Failure registering TOMOYO Linux");
	printk(KERN_INFO "TOMOYO Linux initialized\n");
	cred->security = &tomoyo_kernel_domain;
	tomoyo_mm_init();
	return 0;
}

security_initcall(tomoyo_init);
Commit	Line	Data
f7433243 KT	1	/*
	2	* security/tomoyo/tomoyo.c
	3	*
0f2a55d5	4	* Copyright (C) 2005-2011 NTT DATA CORPORATION
f7433243 KT	5	*/
	6
	7	#include <linux/security.h>
	8	#include "common.h"
f7433243	9
0f2a55d5 TH	10	/**
	11	* tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
	12	*
	13	* @new: Pointer to "struct cred".
	14	* @gfp: Memory allocation flags.
	15	*
	16	* Returns 0.
	17	*/
ee18d64c DH	18	static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
	19	{
	20	new->security = NULL;
	21	return 0;
	22	}
	23
0f2a55d5 TH	24	/**
	25	* tomoyo_cred_prepare - Target for security_prepare_creds().
	26	*
	27	* @new: Pointer to "struct cred".
	28	* @old: Pointer to "struct cred".
	29	* @gfp: Memory allocation flags.
	30	*
	31	* Returns 0.
	32	*/
f7433243 KT	33	static int tomoyo_cred_prepare(struct cred new, const struct cred old,
	34	gfp_t gfp)
	35	{
ec8e6a4e TH	36	struct tomoyo_domain_info *domain = old->security;
	37	new->security = domain;
	38	if (domain)
	39	atomic_inc(&domain->users);
f7433243 KT	40	return 0;
	41	}
	42
0f2a55d5 TH	43	/**
	44	* tomoyo_cred_transfer - Target for security_transfer_creds().
	45	*
	46	* @new: Pointer to "struct cred".
	47	* @old: Pointer to "struct cred".
	48	*/
ee18d64c DH	49	static void tomoyo_cred_transfer(struct cred new, const struct cred old)
ee18d64c DH	50	{
ec8e6a4e TH	51	tomoyo_cred_prepare(new, old, 0);
	52	}
	53
0f2a55d5 TH	54	/**
	55	* tomoyo_cred_free - Target for security_cred_free().
	56	*
	57	* @cred: Pointer to "struct cred".
	58	*/
ec8e6a4e TH	59	static void tomoyo_cred_free(struct cred *cred)
	60	{
	61	struct tomoyo_domain_info *domain = cred->security;
	62	if (domain)
	63	atomic_dec(&domain->users);
ee18d64c DH	64	}
ee18d64c DH	65
0f2a55d5 TH	66	/**
	67	* tomoyo_bprm_set_creds - Target for security_bprm_set_creds().
	68	*
	69	* @bprm: Pointer to "struct linux_binprm".
	70	*
	71	* Returns 0 on success, negative value otherwise.
	72	*/
f7433243 KT	73	static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
f7433243 KT	74	{
b1338d19 HRK	75	int rc;
	76
	77	rc = cap_bprm_set_creds(bprm);
	78	if (rc)
	79	return rc;
	80
f7433243 KT	81	/*
	82	* Do only if this function is called for the first time of an execve
	83	* operation.
	84	*/
	85	if (bprm->cred_prepared)
	86	return 0;
7986cf28	87	#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
f7433243 KT	88	/*
	89	* Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
	90	* for the first time.
	91	*/
	92	if (!tomoyo_policy_loaded)
	93	tomoyo_load_policy(bprm->filename);
7986cf28	94	#endif
ec8e6a4e TH	95	/*
	96	* Release reference to "struct tomoyo_domain_info" stored inside
	97	* "bprm->cred->security". New reference to "struct tomoyo_domain_info"
	98	* stored inside "bprm->cred->security" will be acquired later inside
	99	* tomoyo_find_next_domain().
	100	*/
	101	atomic_dec(&((struct tomoyo_domain_info *)
	102	bprm->cred->security)->users);
f7433243 KT	103	/*
	104	* Tell tomoyo_bprm_check_security() is called for the first time of an
	105	* execve operation.
	106	*/
	107	bprm->cred->security = NULL;
	108	return 0;
	109	}
	110
0f2a55d5 TH	111	/**
	112	* tomoyo_bprm_check_security - Target for security_bprm_check().
	113	*
	114	* @bprm: Pointer to "struct linux_binprm".
	115	*
	116	* Returns 0 on success, negative value otherwise.
	117	*/
f7433243 KT	118	static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
	119	{
	120	struct tomoyo_domain_info *domain = bprm->cred->security;
	121
	122	/*
	123	* Execute permission is checked against pathname passed to do_execve()
	124	* using current domain.
	125	*/
fdb8ebb7	126	if (!domain) {
fdb8ebb7 TH	127	const int idx = tomoyo_read_lock();
	128	const int err = tomoyo_find_next_domain(bprm);
	129	tomoyo_read_unlock(idx);
	130	return err;
	131	}
f7433243 KT	132	/*
f7433243 KT	133	* Read permission is checked against interpreters using next domain.
f7433243	134	*/
0f2a55d5 TH	135	return tomoyo_check_open_permission(domain, &bprm->file->f_path,
0f2a55d5 TH	136	O_RDONLY);
f7433243 KT	137	}
f7433243 KT	138
0f2a55d5 TH	139	/**
	140	* tomoyo_inode_getattr - Target for security_inode_getattr().
	141	*
	142	* @mnt: Pointer to "struct vfsmount".
	143	* @dentry: Pointer to "struct dentry".
	144	*
	145	* Returns 0 on success, negative value otherwise.
	146	*/
7c75964f TH	147	static int tomoyo_inode_getattr(struct vfsmount mnt, struct dentry dentry)
	148	{
	149	struct path path = { mnt, dentry };
97fb35e4	150	return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
7c75964f TH	151	}
7c75964f TH	152
0f2a55d5 TH	153	/**
	154	* tomoyo_path_truncate - Target for security_path_truncate().
	155	*
	156	* @path: Pointer to "struct path".
	157	*
	158	* Returns 0 on success, negative value otherwise.
	159	*/
ea0d3ab2	160	static int tomoyo_path_truncate(struct path *path)
f7433243	161	{
97fb35e4	162	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
f7433243 KT	163	}
f7433243 KT	164
0f2a55d5 TH	165	/**
	166	* tomoyo_path_unlink - Target for security_path_unlink().
	167	*
	168	* @parent: Pointer to "struct path".
	169	* @dentry: Pointer to "struct dentry".
	170	*
	171	* Returns 0 on success, negative value otherwise.
	172	*/
f7433243 KT	173	static int tomoyo_path_unlink(struct path parent, struct dentry dentry)
	174	{
	175	struct path path = { parent->mnt, dentry };
97fb35e4	176	return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
f7433243 KT	177	}
f7433243 KT	178
0f2a55d5 TH	179	/**
	180	* tomoyo_path_mkdir - Target for security_path_mkdir().
	181	*
	182	* @parent: Pointer to "struct path".
	183	* @dentry: Pointer to "struct dentry".
	184	* @mode: DAC permission mode.
	185	*
	186	* Returns 0 on success, negative value otherwise.
	187	*/
f7433243	188	static int tomoyo_path_mkdir(struct path parent, struct dentry dentry,
4572befe	189	umode_t mode)
f7433243 KT	190	{
f7433243 KT	191	struct path path = { parent->mnt, dentry };
a1f9bb6a TH	192	return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
a1f9bb6a TH	193	mode & S_IALLUGO);
f7433243 KT	194	}
f7433243 KT	195
0f2a55d5 TH	196	/**
	197	* tomoyo_path_rmdir - Target for security_path_rmdir().
	198	*
	199	* @parent: Pointer to "struct path".
	200	* @dentry: Pointer to "struct dentry".
	201	*
	202	* Returns 0 on success, negative value otherwise.
	203	*/
f7433243 KT	204	static int tomoyo_path_rmdir(struct path parent, struct dentry dentry)
	205	{
	206	struct path path = { parent->mnt, dentry };
97fb35e4	207	return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
f7433243 KT	208	}
f7433243 KT	209
0f2a55d5 TH	210	/**
	211	* tomoyo_path_symlink - Target for security_path_symlink().
	212	*
	213	* @parent: Pointer to "struct path".
	214	* @dentry: Pointer to "struct dentry".
	215	* @old_name: Symlink's content.
	216	*
	217	* Returns 0 on success, negative value otherwise.
	218	*/
f7433243 KT	219	static int tomoyo_path_symlink(struct path parent, struct dentry dentry,
	220	const char *old_name)
	221	{
	222	struct path path = { parent->mnt, dentry };
97fb35e4	223	return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
f7433243 KT	224	}
f7433243 KT	225
0f2a55d5 TH	226	/**
	227	* tomoyo_path_mknod - Target for security_path_mknod().
	228	*
	229	* @parent: Pointer to "struct path".
	230	* @dentry: Pointer to "struct dentry".
	231	* @mode: DAC permission mode.
	232	* @dev: Device attributes.
	233	*
	234	* Returns 0 on success, negative value otherwise.
	235	*/
f7433243	236	static int tomoyo_path_mknod(struct path parent, struct dentry dentry,
04fc66e7	237	umode_t mode, unsigned int dev)
f7433243 KT	238	{
f7433243 KT	239	struct path path = { parent->mnt, dentry };
7ef61233	240	int type = TOMOYO_TYPE_CREATE;
a1f9bb6a	241	const unsigned int perm = mode & S_IALLUGO;
f7433243 KT	242
	243	switch (mode & S_IFMT) {
	244	case S_IFCHR:
7ef61233	245	type = TOMOYO_TYPE_MKCHAR;
f7433243 KT	246	break;
f7433243 KT	247	case S_IFBLK:
7ef61233	248	type = TOMOYO_TYPE_MKBLOCK;
f7433243	249	break;
a1f9bb6a TH	250	default:
	251	goto no_dev;
	252	}
75093152	253	return tomoyo_mkdev_perm(type, &path, perm, dev);
a1f9bb6a TH	254	no_dev:
a1f9bb6a TH	255	switch (mode & S_IFMT) {
f7433243	256	case S_IFIFO:
7ef61233	257	type = TOMOYO_TYPE_MKFIFO;
f7433243 KT	258	break;
f7433243 KT	259	case S_IFSOCK:
7ef61233	260	type = TOMOYO_TYPE_MKSOCK;
f7433243 KT	261	break;
f7433243 KT	262	}
a1f9bb6a	263	return tomoyo_path_number_perm(type, &path, perm);
f7433243 KT	264	}
f7433243 KT	265
0f2a55d5 TH	266	/**
	267	* tomoyo_path_link - Target for security_path_link().
	268	*
	269	* @old_dentry: Pointer to "struct dentry".
	270	* @new_dir: Pointer to "struct path".
	271	* @new_dentry: Pointer to "struct dentry".
	272	*
	273	* Returns 0 on success, negative value otherwise.
	274	*/
f7433243 KT	275	static int tomoyo_path_link(struct dentry old_dentry, struct path new_dir,
	276	struct dentry *new_dentry)
	277	{
	278	struct path path1 = { new_dir->mnt, old_dentry };
	279	struct path path2 = { new_dir->mnt, new_dentry };
97d6931e	280	return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
f7433243 KT	281	}
f7433243 KT	282
0f2a55d5 TH	283	/**
	284	* tomoyo_path_rename - Target for security_path_rename().
	285	*
	286	* @old_parent: Pointer to "struct path".
	287	* @old_dentry: Pointer to "struct dentry".
	288	* @new_parent: Pointer to "struct path".
	289	* @new_dentry: Pointer to "struct dentry".
	290	*
	291	* Returns 0 on success, negative value otherwise.
	292	*/
f7433243 KT	293	static int tomoyo_path_rename(struct path *old_parent,
	294	struct dentry *old_dentry,
	295	struct path *new_parent,
	296	struct dentry *new_dentry)
	297	{
	298	struct path path1 = { old_parent->mnt, old_dentry };
	299	struct path path2 = { new_parent->mnt, new_dentry };
97d6931e	300	return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
f7433243 KT	301	}
f7433243 KT	302
0f2a55d5 TH	303	/**
	304	* tomoyo_file_fcntl - Target for security_file_fcntl().
	305	*
	306	* @file: Pointer to "struct file".
	307	* @cmd: Command for fcntl().
	308	* @arg: Argument for @cmd.
	309	*
	310	* Returns 0 on success, negative value otherwise.
	311	*/
f7433243 KT	312	static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
	313	unsigned long arg)
	314	{
7c75964f TH	315	if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)))
	316	return 0;
	317	return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
	318	O_WRONLY \| (arg & O_APPEND));
f7433243 KT	319	}
f7433243 KT	320
0f2a55d5	321	/**
83d49856	322	* tomoyo_file_open - Target for security_file_open().
0f2a55d5 TH	323	*
	324	* @f: Pointer to "struct file".
	325	* @cred: Pointer to "struct cred".
	326	*
	327	* Returns 0 on success, negative value otherwise.
	328	*/
83d49856	329	static int tomoyo_file_open(struct file f, const struct cred cred)
f7433243 KT	330	{
f7433243 KT	331	int flags = f->f_flags;
f7433243 KT	332	/* Don't check read permission here if called from do_execve(). */
	333	if (current->in_execve)
	334	return 0;
	335	return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
	336	}
	337
0f2a55d5 TH	338	/**
	339	* tomoyo_file_ioctl - Target for security_file_ioctl().
	340	*
	341	* @file: Pointer to "struct file".
	342	* @cmd: Command for ioctl().
	343	* @arg: Argument for @cmd.
	344	*
	345	* Returns 0 on success, negative value otherwise.
	346	*/
937bf613 TH	347	static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
	348	unsigned long arg)
	349	{
a1f9bb6a	350	return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
937bf613 TH	351	}
937bf613 TH	352
0f2a55d5 TH	353	/**
	354	* tomoyo_path_chmod - Target for security_path_chmod().
	355	*
cdcf116d AV	356	* @path: Pointer to "struct path".
cdcf116d AV	357	* @mode: DAC permission mode.
0f2a55d5 TH	358	*
	359	* Returns 0 on success, negative value otherwise.
	360	*/
cdcf116d	361	static int tomoyo_path_chmod(struct path *path, umode_t mode)
937bf613	362	{
cdcf116d	363	return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path,
a1f9bb6a	364	mode & S_IALLUGO);
937bf613 TH	365	}
937bf613 TH	366
0f2a55d5 TH	367	/**
	368	* tomoyo_path_chown - Target for security_path_chown().
	369	*
	370	* @path: Pointer to "struct path".
	371	* @uid: Owner ID.
	372	* @gid: Group ID.
	373	*
	374	* Returns 0 on success, negative value otherwise.
	375	*/
937bf613 TH	376	static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
	377	{
	378	int error = 0;
	379	if (uid != (uid_t) -1)
a1f9bb6a	380	error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, uid);
937bf613	381	if (!error && gid != (gid_t) -1)
a1f9bb6a	382	error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, gid);
937bf613 TH	383	return error;
	384	}
	385
0f2a55d5 TH	386	/**
	387	* tomoyo_path_chroot - Target for security_path_chroot().
	388	*
	389	* @path: Pointer to "struct path".
	390	*
	391	* Returns 0 on success, negative value otherwise.
	392	*/
937bf613 TH	393	static int tomoyo_path_chroot(struct path *path)
937bf613 TH	394	{
97fb35e4	395	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
937bf613 TH	396	}
937bf613 TH	397
0f2a55d5 TH	398	/**
	399	* tomoyo_sb_mount - Target for security_sb_mount().
	400	*
	401	* @dev_name: Name of device file. Maybe NULL.
	402	* @path: Pointer to "struct path".
	403	* @type: Name of filesystem type. Maybe NULL.
	404	* @flags: Mount options.
	405	* @data: Optional data. Maybe NULL.
	406	*
	407	* Returns 0 on success, negative value otherwise.
	408	*/
937bf613 TH	409	static int tomoyo_sb_mount(char dev_name, struct path path,
	410	char type, unsigned long flags, void data)
	411	{
2106ccd9	412	return tomoyo_mount_permission(dev_name, path, type, flags, data);
937bf613 TH	413	}
937bf613 TH	414
0f2a55d5 TH	415	/**
	416	* tomoyo_sb_umount - Target for security_sb_umount().
	417	*
	418	* @mnt: Pointer to "struct vfsmount".
	419	* @flags: Unmount options.
	420	*
	421	* Returns 0 on success, negative value otherwise.
	422	*/
937bf613 TH	423	static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
	424	{
	425	struct path path = { mnt, mnt->mnt_root };
97fb35e4	426	return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
937bf613 TH	427	}
937bf613 TH	428
0f2a55d5 TH	429	/**
	430	* tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
	431	*
	432	* @old_path: Pointer to "struct path".
	433	* @new_path: Pointer to "struct path".
	434	*
	435	* Returns 0 on success, negative value otherwise.
	436	*/
937bf613 TH	437	static int tomoyo_sb_pivotroot(struct path old_path, struct path new_path)
937bf613 TH	438	{
97d6931e	439	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
937bf613 TH	440	}
937bf613 TH	441
059d84db TH	442	/**
	443	* tomoyo_socket_listen - Check permission for listen().
	444	*
	445	* @sock: Pointer to "struct socket".
	446	* @backlog: Backlog parameter.
	447	*
	448	* Returns 0 on success, negative value otherwise.
	449	*/
	450	static int tomoyo_socket_listen(struct socket *sock, int backlog)
	451	{
	452	return tomoyo_socket_listen_permission(sock);
	453	}
	454
	455	/**
	456	* tomoyo_socket_connect - Check permission for connect().
	457	*
	458	* @sock: Pointer to "struct socket".
	459	* @addr: Pointer to "struct sockaddr".
	460	* @addr_len: Size of @addr.
	461	*
	462	* Returns 0 on success, negative value otherwise.
	463	*/
	464	static int tomoyo_socket_connect(struct socket sock, struct sockaddr addr,
	465	int addr_len)
	466	{
	467	return tomoyo_socket_connect_permission(sock, addr, addr_len);
	468	}
	469
	470	/**
	471	* tomoyo_socket_bind - Check permission for bind().
	472	*
	473	* @sock: Pointer to "struct socket".
	474	* @addr: Pointer to "struct sockaddr".
	475	* @addr_len: Size of @addr.
	476	*
	477	* Returns 0 on success, negative value otherwise.
	478	*/
	479	static int tomoyo_socket_bind(struct socket sock, struct sockaddr addr,
	480	int addr_len)
	481	{
	482	return tomoyo_socket_bind_permission(sock, addr, addr_len);
	483	}
	484
	485	/**
	486	* tomoyo_socket_sendmsg - Check permission for sendmsg().
	487	*
	488	* @sock: Pointer to "struct socket".
	489	* @msg: Pointer to "struct msghdr".
	490	* @size: Size of message.
	491	*
	492	* Returns 0 on success, negative value otherwise.
	493	*/
	494	static int tomoyo_socket_sendmsg(struct socket sock, struct msghdr msg,
	495	int size)
	496	{
	497	return tomoyo_socket_sendmsg_permission(sock, msg, size);
	498	}
	499
c3fa109a TH	500	/*
	501	* tomoyo_security_ops is a "struct security_operations" which is used for
	502	* registering TOMOYO.
	503	*/
f7433243 KT	504	static struct security_operations tomoyo_security_ops = {
f7433243 KT	505	.name = "tomoyo",
ee18d64c	506	.cred_alloc_blank = tomoyo_cred_alloc_blank,
f7433243	507	.cred_prepare = tomoyo_cred_prepare,
ee18d64c	508	.cred_transfer = tomoyo_cred_transfer,
ec8e6a4e	509	.cred_free = tomoyo_cred_free,
f7433243 KT	510	.bprm_set_creds = tomoyo_bprm_set_creds,
f7433243 KT	511	.bprm_check_security = tomoyo_bprm_check_security,
f7433243	512	.file_fcntl = tomoyo_file_fcntl,
83d49856	513	.file_open = tomoyo_file_open,
f7433243 KT	514	.path_truncate = tomoyo_path_truncate,
	515	.path_unlink = tomoyo_path_unlink,
	516	.path_mkdir = tomoyo_path_mkdir,
	517	.path_rmdir = tomoyo_path_rmdir,
	518	.path_symlink = tomoyo_path_symlink,
	519	.path_mknod = tomoyo_path_mknod,
	520	.path_link = tomoyo_path_link,
	521	.path_rename = tomoyo_path_rename,
7c75964f	522	.inode_getattr = tomoyo_inode_getattr,
937bf613 TH	523	.file_ioctl = tomoyo_file_ioctl,
	524	.path_chmod = tomoyo_path_chmod,
	525	.path_chown = tomoyo_path_chown,
	526	.path_chroot = tomoyo_path_chroot,
	527	.sb_mount = tomoyo_sb_mount,
	528	.sb_umount = tomoyo_sb_umount,
	529	.sb_pivotroot = tomoyo_sb_pivotroot,
059d84db TH	530	.socket_bind = tomoyo_socket_bind,
	531	.socket_connect = tomoyo_socket_connect,
	532	.socket_listen = tomoyo_socket_listen,
	533	.socket_sendmsg = tomoyo_socket_sendmsg,
f7433243 KT	534	};
f7433243 KT	535
fdb8ebb7 TH	536	/* Lock for GC. */
	537	struct srcu_struct tomoyo_ss;
	538
0f2a55d5 TH	539	/**
	540	* tomoyo_init - Register TOMOYO Linux as a LSM module.
	541	*
	542	* Returns 0.
	543	*/
f7433243 KT	544	static int __init tomoyo_init(void)
	545	{
	546	struct cred cred = (struct cred ) current_cred();
	547
	548	if (!security_module_enable(&tomoyo_security_ops))
	549	return 0;
	550	/* register ourselves with the security framework */
fdb8ebb7 TH	551	if (register_security(&tomoyo_security_ops) \|\|
fdb8ebb7 TH	552	init_srcu_struct(&tomoyo_ss))
f7433243 KT	553	panic("Failure registering TOMOYO Linux");
	554	printk(KERN_INFO "TOMOYO Linux initialized\n");
	555	cred->security = &tomoyo_kernel_domain;
c3ef1500	556	tomoyo_mm_init();
f7433243 KT	557	return 0;
	558	}
	559
	560	security_initcall(tomoyo_init);