[linux-2.6-block.git] / security / tomoyo / securityfs_if.c

// SPDX-License-Identifier: GPL-2.0
/*
 * security/tomoyo/securityfs_if.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

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

/**
 * tomoyo_check_task_acl - Check permission for task operation.
 *
 * @r:   Pointer to "struct tomoyo_request_info".
 * @ptr: Pointer to "struct tomoyo_acl_info".
 *
 * Returns true if granted, false otherwise.
 */
static bool tomoyo_check_task_acl(struct tomoyo_request_info *r,
				  const struct tomoyo_acl_info *ptr)
{
	const struct tomoyo_task_acl *acl = container_of(ptr, typeof(*acl),
							 head);

	return !tomoyo_pathcmp(r->param.task.domainname, acl->domainname);
}

/**
 * tomoyo_write_self - write() for /sys/kernel/security/tomoyo/self_domain interface.
 *
 * @file:  Pointer to "struct file".
 * @buf:   Domainname to transit to.
 * @count: Size of @buf.
 * @ppos:  Unused.
 *
 * Returns @count on success, negative value otherwise.
 *
 * If domain transition was permitted but the domain transition failed, this
 * function returns error rather than terminating current thread with SIGKILL.
 */
static ssize_t tomoyo_write_self(struct file *file, const char __user *buf,
			      size_t count, loff_t *ppos)
{
	char *data;
	int error;

	if (!count || count >= TOMOYO_EXEC_TMPSIZE - 10)
		return -ENOMEM;
	data = memdup_user_nul(buf, count);
	if (IS_ERR(data))
		return PTR_ERR(data);
	tomoyo_normalize_line(data);
	if (tomoyo_correct_domain(data)) {
		const int idx = tomoyo_read_lock();
		struct tomoyo_path_info name;
		struct tomoyo_request_info r;

		name.name = data;
		tomoyo_fill_path_info(&name);
		/* Check "task manual_domain_transition" permission. */
		tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
		r.param_type = TOMOYO_TYPE_MANUAL_TASK_ACL;
		r.param.task.domainname = &name;
		tomoyo_check_acl(&r, tomoyo_check_task_acl);
		if (!r.granted)
			error = -EPERM;
		else {
			struct tomoyo_domain_info *new_domain =
				tomoyo_assign_domain(data, true);
			if (!new_domain) {
				error = -ENOENT;
			} else {
				struct tomoyo_task *s = tomoyo_task(current);
				struct tomoyo_domain_info *old_domain =
					s->domain_info;

				s->domain_info = new_domain;
				atomic_inc(&new_domain->users);
				atomic_dec(&old_domain->users);
				error = 0;
			}
		}
		tomoyo_read_unlock(idx);
	} else
		error = -EINVAL;
	kfree(data);
	return error ? error : count;
}

/**
 * tomoyo_read_self - read() for /sys/kernel/security/tomoyo/self_domain interface.
 *
 * @file:  Pointer to "struct file".
 * @buf:   Domainname which current thread belongs to.
 * @count: Size of @buf.
 * @ppos:  Bytes read by now.
 *
 * Returns read size on success, negative value otherwise.
 */
static ssize_t tomoyo_read_self(struct file *file, char __user *buf,
				size_t count, loff_t *ppos)
{
	const char *domain = tomoyo_domain()->domainname->name;
	loff_t len = strlen(domain);
	loff_t pos = *ppos;

	if (pos >= len || !count)
		return 0;
	len -= pos;
	if (count < len)
		len = count;
	if (copy_to_user(buf, domain + pos, len))
		return -EFAULT;
	*ppos += len;
	return len;
}

/* Operations for /sys/kernel/security/tomoyo/self_domain interface. */
static const struct file_operations tomoyo_self_operations = {
	.write = tomoyo_write_self,
	.read  = tomoyo_read_self,
};

/**
 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
 *
 * @inode: Pointer to "struct inode".
 * @file:  Pointer to "struct file".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_open(struct inode *inode, struct file *file)
{
	const int key = ((u8 *) file_inode(file)->i_private)
		- ((u8 *) NULL);
	return tomoyo_open_control(key, file);
}

/**
 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
 *
 * @file:  Pointer to "struct file".
 *
 */
static int tomoyo_release(struct inode *inode, struct file *file)
{
	tomoyo_close_control(file->private_data);
	return 0;
}

/**
 * tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface.
 *
 * @file: Pointer to "struct file".
 * @wait: Pointer to "poll_table". Maybe NULL.
 *
 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
 * EPOLLOUT | EPOLLWRNORM otherwise.
 */
static __poll_t tomoyo_poll(struct file *file, poll_table *wait)
{
	return tomoyo_poll_control(file, wait);
}

/**
 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
 *
 * @file:  Pointer to "struct file".
 * @buf:   Pointer to buffer.
 * @count: Size of @buf.
 * @ppos:  Unused.
 *
 * Returns bytes read on success, negative value otherwise.
 */
static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
			   loff_t *ppos)
{
	return tomoyo_read_control(file->private_data, buf, count);
}

/**
 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
 *
 * @file:  Pointer to "struct file".
 * @buf:   Pointer to buffer.
 * @count: Size of @buf.
 * @ppos:  Unused.
 *
 * Returns @count on success, negative value otherwise.
 */
static ssize_t tomoyo_write(struct file *file, const char __user *buf,
			    size_t count, loff_t *ppos)
{
	return tomoyo_write_control(file->private_data, buf, count);
}

/*
 * tomoyo_operations is a "struct file_operations" which is used for handling
 * /sys/kernel/security/tomoyo/ interface.
 *
 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
 * See tomoyo_io_buffer for internals.
 */
static const struct file_operations tomoyo_operations = {
	.open    = tomoyo_open,
	.release = tomoyo_release,
	.poll    = tomoyo_poll,
	.read    = tomoyo_read,
	.write   = tomoyo_write,
	.llseek  = noop_llseek,
};

/**
 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
 *
 * @name:   The name of the interface file.
 * @mode:   The permission of the interface file.
 * @parent: The parent directory.
 * @key:    Type of interface.
 *
 * Returns nothing.
 */
static void __init tomoyo_create_entry(const char *name, const umode_t mode,
				       struct dentry *parent, const u8 key)
{
	securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
			       &tomoyo_operations);
}

/**
 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
 *
 * Returns 0.
 */
static int __init tomoyo_initerface_init(void)
{
	struct tomoyo_domain_info *domain;
	struct dentry *tomoyo_dir;

	if (!tomoyo_enabled)
		return 0;
	domain = tomoyo_domain();
	/* Don't create securityfs entries unless registered. */
	if (domain != &tomoyo_kernel_domain)
		return 0;

	tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
	tomoyo_create_entry("query",            0600, tomoyo_dir,
			    TOMOYO_QUERY);
	tomoyo_create_entry("domain_policy",    0600, tomoyo_dir,
			    TOMOYO_DOMAINPOLICY);
	tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
			    TOMOYO_EXCEPTIONPOLICY);
	tomoyo_create_entry("audit",            0400, tomoyo_dir,
			    TOMOYO_AUDIT);
	tomoyo_create_entry(".process_status",  0600, tomoyo_dir,
			    TOMOYO_PROCESS_STATUS);
	tomoyo_create_entry("stat",             0644, tomoyo_dir,
			    TOMOYO_STAT);
	tomoyo_create_entry("profile",          0600, tomoyo_dir,
			    TOMOYO_PROFILE);
	tomoyo_create_entry("manager",          0600, tomoyo_dir,
			    TOMOYO_MANAGER);
	tomoyo_create_entry("version",          0400, tomoyo_dir,
			    TOMOYO_VERSION);
	securityfs_create_file("self_domain", 0666, tomoyo_dir, NULL,
			       &tomoyo_self_operations);
	tomoyo_load_builtin_policy();
	return 0;
}

fs_initcall(tomoyo_initerface_init);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
c3ef1500	2	/*
0f2a55d5	3	* security/tomoyo/securityfs_if.c
c3ef1500	4	*
0f2a55d5	5	* Copyright (C) 2005-2011 NTT DATA CORPORATION
c3ef1500 TH	6	*/
	7
	8	#include <linux/security.h>
	9	#include "common.h"
	10
731d37aa TH	11	/**
	12	* tomoyo_check_task_acl - Check permission for task operation.
	13	*
	14	* @r: Pointer to "struct tomoyo_request_info".
	15	* @ptr: Pointer to "struct tomoyo_acl_info".
	16	*
	17	* Returns true if granted, false otherwise.
	18	*/
	19	static bool tomoyo_check_task_acl(struct tomoyo_request_info *r,
	20	const struct tomoyo_acl_info *ptr)
	21	{
	22	const struct tomoyo_task_acl acl = container_of(ptr, typeof(acl),
	23	head);
cdcf6723	24
731d37aa TH	25	return !tomoyo_pathcmp(r->param.task.domainname, acl->domainname);
	26	}
	27
	28	/**
	29	* tomoyo_write_self - write() for /sys/kernel/security/tomoyo/self_domain interface.
	30	*
	31	* @file: Pointer to "struct file".
	32	* @buf: Domainname to transit to.
	33	* @count: Size of @buf.
	34	* @ppos: Unused.
	35	*
	36	* Returns @count on success, negative value otherwise.
	37	*
	38	* If domain transition was permitted but the domain transition failed, this
	39	* function returns error rather than terminating current thread with SIGKILL.
	40	*/
	41	static ssize_t tomoyo_write_self(struct file file, const char __user buf,
	42	size_t count, loff_t *ppos)
	43	{
	44	char *data;
	45	int error;
cdcf6723	46
731d37aa TH	47	if (!count \|\| count >= TOMOYO_EXEC_TMPSIZE - 10)
731d37aa TH	48	return -ENOMEM;
16e5c1fc AV	49	data = memdup_user_nul(buf, count);
	50	if (IS_ERR(data))
	51	return PTR_ERR(data);
731d37aa TH	52	tomoyo_normalize_line(data);
	53	if (tomoyo_correct_domain(data)) {
	54	const int idx = tomoyo_read_lock();
	55	struct tomoyo_path_info name;
	56	struct tomoyo_request_info r;
cdcf6723	57
731d37aa TH	58	name.name = data;
	59	tomoyo_fill_path_info(&name);
	60	/* Check "task manual_domain_transition" permission. */
	61	tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
	62	r.param_type = TOMOYO_TYPE_MANUAL_TASK_ACL;
	63	r.param.task.domainname = &name;
	64	tomoyo_check_acl(&r, tomoyo_check_task_acl);
	65	if (!r.granted)
	66	error = -EPERM;
	67	else {
	68	struct tomoyo_domain_info *new_domain =
	69	tomoyo_assign_domain(data, true);
	70	if (!new_domain) {
	71	error = -ENOENT;
	72	} else {
8c6cb983 TH	73	struct tomoyo_task *s = tomoyo_task(current);
	74	struct tomoyo_domain_info *old_domain =
	75	s->domain_info;
43fc4609	76
8c6cb983 TH	77	s->domain_info = new_domain;
	78	atomic_inc(&new_domain->users);
	79	atomic_dec(&old_domain->users);
	80	error = 0;
731d37aa TH	81	}
	82	}
	83	tomoyo_read_unlock(idx);
	84	} else
	85	error = -EINVAL;
731d37aa TH	86	kfree(data);
	87	return error ? error : count;
	88	}
	89
	90	/**
	91	* tomoyo_read_self - read() for /sys/kernel/security/tomoyo/self_domain interface.
	92	*
	93	* @file: Pointer to "struct file".
	94	* @buf: Domainname which current thread belongs to.
	95	* @count: Size of @buf.
	96	* @ppos: Bytes read by now.
	97	*
	98	* Returns read size on success, negative value otherwise.
	99	*/
	100	static ssize_t tomoyo_read_self(struct file file, char __user buf,
	101	size_t count, loff_t *ppos)
	102	{
	103	const char *domain = tomoyo_domain()->domainname->name;
	104	loff_t len = strlen(domain);
	105	loff_t pos = *ppos;
cdcf6723	106
731d37aa TH	107	if (pos >= len \|\| !count)
	108	return 0;
	109	len -= pos;
	110	if (count < len)
	111	len = count;
	112	if (copy_to_user(buf, domain + pos, len))
	113	return -EFAULT;
	114	*ppos += len;
	115	return len;
	116	}
	117
	118	/* Operations for /sys/kernel/security/tomoyo/self_domain interface. */
	119	static const struct file_operations tomoyo_self_operations = {
	120	.write = tomoyo_write_self,
	121	.read = tomoyo_read_self,
	122	};
	123
c3ef1500 TH	124	/**
	125	* tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
	126	*
	127	* @inode: Pointer to "struct inode".
	128	* @file: Pointer to "struct file".
	129	*
	130	* Returns 0 on success, negative value otherwise.
	131	*/
	132	static int tomoyo_open(struct inode inode, struct file file)
	133	{
496ad9aa	134	const int key = ((u8 *) file_inode(file)->i_private)
c3ef1500 TH	135	- ((u8 *) NULL);
	136	return tomoyo_open_control(key, file);
	137	}
	138
	139	/**
	140	* tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
	141	*
c3ef1500 TH	142	* @file: Pointer to "struct file".
c3ef1500 TH	143	*
c3ef1500 TH	144	*/
	145	static int tomoyo_release(struct inode inode, struct file file)
	146	{
e53cfda5 AV	147	tomoyo_close_control(file->private_data);
e53cfda5 AV	148	return 0;
c3ef1500 TH	149	}
c3ef1500 TH	150
0849e3ba	151	/**
b5bc60b4	152	* tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface.
0849e3ba TH	153	*
0849e3ba TH	154	* @file: Pointer to "struct file".
6041e834	155	* @wait: Pointer to "poll_table". Maybe NULL.
0849e3ba	156	*
a9a08845 LT	157	* Returns EPOLLIN \| EPOLLRDNORM \| EPOLLOUT \| EPOLLWRNORM if ready to read/write,
a9a08845 LT	158	* EPOLLOUT \| EPOLLWRNORM otherwise.
0849e3ba	159	*/
c0d4be28	160	static __poll_t tomoyo_poll(struct file file, poll_table wait)
0849e3ba TH	161	{
	162	return tomoyo_poll_control(file, wait);
	163	}
	164
c3ef1500 TH	165	/**
	166	* tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
	167	*
	168	* @file: Pointer to "struct file".
	169	* @buf: Pointer to buffer.
	170	* @count: Size of @buf.
	171	* @ppos: Unused.
	172	*
	173	* Returns bytes read on success, negative value otherwise.
	174	*/
	175	static ssize_t tomoyo_read(struct file file, char __user buf, size_t count,
	176	loff_t *ppos)
	177	{
0df7e8b8	178	return tomoyo_read_control(file->private_data, buf, count);
c3ef1500 TH	179	}
	180
	181	/**
	182	* tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
	183	*
	184	* @file: Pointer to "struct file".
	185	* @buf: Pointer to buffer.
	186	* @count: Size of @buf.
	187	* @ppos: Unused.
	188	*
	189	* Returns @count on success, negative value otherwise.
	190	*/
	191	static ssize_t tomoyo_write(struct file file, const char __user buf,
	192	size_t count, loff_t *ppos)
	193	{
0df7e8b8	194	return tomoyo_write_control(file->private_data, buf, count);
c3ef1500 TH	195	}
	196
	197	/*
	198	* tomoyo_operations is a "struct file_operations" which is used for handling
	199	* /sys/kernel/security/tomoyo/ interface.
	200	*
	201	* Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
	202	* See tomoyo_io_buffer for internals.
	203	*/
	204	static const struct file_operations tomoyo_operations = {
	205	.open = tomoyo_open,
	206	.release = tomoyo_release,
0849e3ba	207	.poll = tomoyo_poll,
c3ef1500 TH	208	.read = tomoyo_read,
c3ef1500 TH	209	.write = tomoyo_write,
7e2deb7c	210	.llseek = noop_llseek,
c3ef1500 TH	211	};
	212
	213	/**
	214	* tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
	215	*
	216	* @name: The name of the interface file.
	217	* @mode: The permission of the interface file.
	218	* @parent: The parent directory.
	219	* @key: Type of interface.
	220	*
	221	* Returns nothing.
	222	*/
52ef0c04	223	static void __init tomoyo_create_entry(const char *name, const umode_t mode,
c3ef1500 TH	224	struct dentry *parent, const u8 key)
	225	{
	226	securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
	227	&tomoyo_operations);
	228	}
	229
	230	/**
	231	* tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
	232	*
	233	* Returns 0.
	234	*/
	235	static int __init tomoyo_initerface_init(void)
	236	{
43fc4609	237	struct tomoyo_domain_info *domain;
c3ef1500 TH	238	struct dentry *tomoyo_dir;
c3ef1500 TH	239
43fc4609 CS	240	if (!tomoyo_enabled)
	241	return 0;
	242	domain = tomoyo_domain();
c3ef1500	243	/* Don't create securityfs entries unless registered. */
43fc4609	244	if (domain != &tomoyo_kernel_domain)
c3ef1500 TH	245	return 0;
	246
	247	tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
	248	tomoyo_create_entry("query", 0600, tomoyo_dir,
	249	TOMOYO_QUERY);
	250	tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
	251	TOMOYO_DOMAINPOLICY);
	252	tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
	253	TOMOYO_EXCEPTIONPOLICY);
eadd99cc TH	254	tomoyo_create_entry("audit", 0400, tomoyo_dir,
eadd99cc TH	255	TOMOYO_AUDIT);
c3ef1500 TH	256	tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
c3ef1500 TH	257	TOMOYO_PROCESS_STATUS);
b22b8b9f TH	258	tomoyo_create_entry("stat", 0644, tomoyo_dir,
b22b8b9f TH	259	TOMOYO_STAT);
c3ef1500 TH	260	tomoyo_create_entry("profile", 0600, tomoyo_dir,
	261	TOMOYO_PROFILE);
	262	tomoyo_create_entry("manager", 0600, tomoyo_dir,
	263	TOMOYO_MANAGER);
	264	tomoyo_create_entry("version", 0400, tomoyo_dir,
	265	TOMOYO_VERSION);
731d37aa TH	266	securityfs_create_file("self_domain", 0666, tomoyo_dir, NULL,
731d37aa TH	267	&tomoyo_self_operations);
778c4a4d	268	tomoyo_load_builtin_policy();
c3ef1500 TH	269	return 0;
	270	}
	271
	272	fs_initcall(tomoyo_initerface_init);