[net-next-2.6.git] / security / tomoyo / path_group.c

/*
 * security/tomoyo/path_group.c
 *
 * Copyright (C) 2005-2009  NTT DATA CORPORATION
 */

#include <linux/slab.h>
#include "common.h"
/* The list for "struct tomoyo_path_group". */
LIST_HEAD(tomoyo_path_group_list);

/**
 * tomoyo_get_path_group - Allocate memory for "struct tomoyo_path_group".
 *
 * @group_name: The name of pathname group.
 *
 * Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise.
 */
struct tomoyo_path_group *tomoyo_get_path_group(const char *group_name)
{
	struct tomoyo_path_group *entry = NULL;
	struct tomoyo_path_group *group = NULL;
	const struct tomoyo_path_info *saved_group_name;
	int error = -ENOMEM;
	if (!tomoyo_is_correct_word(group_name))
		return NULL;
	saved_group_name = tomoyo_get_name(group_name);
	if (!saved_group_name)
		return NULL;
	entry = kzalloc(sizeof(*entry), GFP_NOFS);
	if (mutex_lock_interruptible(&tomoyo_policy_lock))
		goto out;
	list_for_each_entry_rcu(group, &tomoyo_path_group_list, list) {
		if (saved_group_name != group->group_name)
			continue;
		atomic_inc(&group->users);
		error = 0;
		break;
	}
	if (error && tomoyo_memory_ok(entry)) {
		INIT_LIST_HEAD(&entry->member_list);
		entry->group_name = saved_group_name;
		saved_group_name = NULL;
		atomic_set(&entry->users, 1);
		list_add_tail_rcu(&entry->list, &tomoyo_path_group_list);
		group = entry;
		entry = NULL;
		error = 0;
	}
	mutex_unlock(&tomoyo_policy_lock);
 out:
	tomoyo_put_name(saved_group_name);
	kfree(entry);
	return !error ? group : NULL;
}

/**
 * tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list.
 *
 * @data:      String to parse.
 * @is_delete: True if it is a delete request.
 *
 * Returns 0 on success, nagative value otherwise.
 */
int tomoyo_write_path_group_policy(char *data, const bool is_delete)
{
	struct tomoyo_path_group *group;
	struct tomoyo_path_group_member *member;
	struct tomoyo_path_group_member e = { };
	int error = is_delete ? -ENOENT : -ENOMEM;
	char *w[2];
	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
		return -EINVAL;
	group = tomoyo_get_path_group(w[0]);
	if (!group)
		return -ENOMEM;
	e.member_name = tomoyo_get_name(w[1]);
	if (!e.member_name)
		goto out;
	if (mutex_lock_interruptible(&tomoyo_policy_lock))
		goto out;
	list_for_each_entry_rcu(member, &group->member_list, head.list) {
		if (member->member_name != e.member_name)
			continue;
		member->head.is_deleted = is_delete;
		error = 0;
		break;
	}
	if (!is_delete && error) {
		struct tomoyo_path_group_member *entry =
			tomoyo_commit_ok(&e, sizeof(e));
		if (entry) {
			list_add_tail_rcu(&entry->head.list,
					  &group->member_list);
			error = 0;
		}
	}
	mutex_unlock(&tomoyo_policy_lock);
 out:
	tomoyo_put_name(e.member_name);
	tomoyo_put_path_group(group);
	return error;
}

/**
 * tomoyo_read_path_group_policy - Read "struct tomoyo_path_group" list.
 *
 * @head: Pointer to "struct tomoyo_io_buffer".
 *
 * Returns true on success, false otherwise.
 *
 * Caller holds tomoyo_read_lock().
 */
bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer *head)
{
	struct list_head *gpos;
	struct list_head *mpos;
	list_for_each_cookie(gpos, head->read_var1, &tomoyo_path_group_list) {
		struct tomoyo_path_group *group;
		group = list_entry(gpos, struct tomoyo_path_group, list);
		list_for_each_cookie(mpos, head->read_var2,
				     &group->member_list) {
			struct tomoyo_path_group_member *member;
			member = list_entry(mpos,
					    struct tomoyo_path_group_member,
					    head.list);
			if (member->head.is_deleted)
				continue;
			if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_PATH_GROUP
					      "%s %s\n",
					      group->group_name->name,
					      member->member_name->name))
				return false;
		}
	}
	return true;
}

/**
 * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
 *
 * @pathname:        The name of pathname.
 * @group:           Pointer to "struct tomoyo_path_group".
 *
 * Returns true if @pathname matches pathnames in @group, false otherwise.
 *
 * Caller holds tomoyo_read_lock().
 */
bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
			       const struct tomoyo_path_group *group)
{
	struct tomoyo_path_group_member *member;
	bool matched = false;
	list_for_each_entry_rcu(member, &group->member_list, head.list) {
		if (member->head.is_deleted)
			continue;
		if (!tomoyo_path_matches_pattern(pathname,
						 member->member_name))
			continue;
		matched = true;
		break;
	}
	return matched;
}
Commit	Line	Data
7762fbff TH	1	/*
	2	* security/tomoyo/path_group.c
	3	*
	4	* Copyright (C) 2005-2009 NTT DATA CORPORATION
	5	*/
	6
	7	#include <linux/slab.h>
	8	#include "common.h"
9b244373	9	/* The list for "struct tomoyo_path_group". */
7762fbff TH	10	LIST_HEAD(tomoyo_path_group_list);
	11
	12	/**
	13	* tomoyo_get_path_group - Allocate memory for "struct tomoyo_path_group".
	14	*
	15	* @group_name: The name of pathname group.
	16	*
	17	* Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise.
	18	*/
	19	struct tomoyo_path_group tomoyo_get_path_group(const char group_name)
	20	{
	21	struct tomoyo_path_group *entry = NULL;
	22	struct tomoyo_path_group *group = NULL;
	23	const struct tomoyo_path_info *saved_group_name;
	24	int error = -ENOMEM;
3f629636	25	if (!tomoyo_is_correct_word(group_name))
7762fbff TH	26	return NULL;
	27	saved_group_name = tomoyo_get_name(group_name);
	28	if (!saved_group_name)
	29	return NULL;
	30	entry = kzalloc(sizeof(*entry), GFP_NOFS);
	31	if (mutex_lock_interruptible(&tomoyo_policy_lock))
	32	goto out;
	33	list_for_each_entry_rcu(group, &tomoyo_path_group_list, list) {
	34	if (saved_group_name != group->group_name)
	35	continue;
	36	atomic_inc(&group->users);
	37	error = 0;
	38	break;
	39	}
	40	if (error && tomoyo_memory_ok(entry)) {
	41	INIT_LIST_HEAD(&entry->member_list);
	42	entry->group_name = saved_group_name;
	43	saved_group_name = NULL;
	44	atomic_set(&entry->users, 1);
	45	list_add_tail_rcu(&entry->list, &tomoyo_path_group_list);
	46	group = entry;
	47	entry = NULL;
	48	error = 0;
	49	}
	50	mutex_unlock(&tomoyo_policy_lock);
	51	out:
	52	tomoyo_put_name(saved_group_name);
	53	kfree(entry);
	54	return !error ? group : NULL;
	55	}
	56
	57	/**
	58	* tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list.
	59	*
	60	* @data: String to parse.
	61	* @is_delete: True if it is a delete request.
	62	*
	63	* Returns 0 on success, nagative value otherwise.
	64	*/
	65	int tomoyo_write_path_group_policy(char *data, const bool is_delete)
	66	{
	67	struct tomoyo_path_group *group;
	68	struct tomoyo_path_group_member *member;
	69	struct tomoyo_path_group_member e = { };
	70	int error = is_delete ? -ENOENT : -ENOMEM;
	71	char *w[2];
	72	if (!tomoyo_tokenize(data, w, sizeof(w)) \|\| !w[1][0])
	73	return -EINVAL;
	74	group = tomoyo_get_path_group(w[0]);
	75	if (!group)
	76	return -ENOMEM;
	77	e.member_name = tomoyo_get_name(w[1]);
	78	if (!e.member_name)
	79	goto out;
	80	if (mutex_lock_interruptible(&tomoyo_policy_lock))
	81	goto out;
82e0f001	82	list_for_each_entry_rcu(member, &group->member_list, head.list) {
7762fbff TH	83	if (member->member_name != e.member_name)
7762fbff TH	84	continue;
82e0f001	85	member->head.is_deleted = is_delete;
7762fbff TH	86	error = 0;
	87	break;
	88	}
	89	if (!is_delete && error) {
	90	struct tomoyo_path_group_member *entry =
	91	tomoyo_commit_ok(&e, sizeof(e));
	92	if (entry) {
82e0f001 TH	93	list_add_tail_rcu(&entry->head.list,
82e0f001 TH	94	&group->member_list);
7762fbff TH	95	error = 0;
	96	}
	97	}
	98	mutex_unlock(&tomoyo_policy_lock);
	99	out:
	100	tomoyo_put_name(e.member_name);
	101	tomoyo_put_path_group(group);
	102	return error;
	103	}
	104
	105	/**
	106	* tomoyo_read_path_group_policy - Read "struct tomoyo_path_group" list.
	107	*
	108	* @head: Pointer to "struct tomoyo_io_buffer".
	109	*
	110	* Returns true on success, false otherwise.
	111	*
	112	* Caller holds tomoyo_read_lock().
	113	*/
	114	bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer *head)
	115	{
	116	struct list_head *gpos;
	117	struct list_head *mpos;
	118	list_for_each_cookie(gpos, head->read_var1, &tomoyo_path_group_list) {
	119	struct tomoyo_path_group *group;
	120	group = list_entry(gpos, struct tomoyo_path_group, list);
	121	list_for_each_cookie(mpos, head->read_var2,
	122	&group->member_list) {
	123	struct tomoyo_path_group_member *member;
	124	member = list_entry(mpos,
	125	struct tomoyo_path_group_member,
82e0f001 TH	126	head.list);
82e0f001 TH	127	if (member->head.is_deleted)
7762fbff TH	128	continue;
	129	if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_PATH_GROUP
	130	"%s %s\n",
	131	group->group_name->name,
	132	member->member_name->name))
	133	return false;
	134	}
	135	}
	136	return true;
	137	}
	138
	139	/**
	140	* tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
	141	*
	142	* @pathname: The name of pathname.
	143	* @group: Pointer to "struct tomoyo_path_group".
7762fbff TH	144	*
	145	* Returns true if @pathname matches pathnames in @group, false otherwise.
	146	*
	147	* Caller holds tomoyo_read_lock().
	148	*/
	149	bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
3f629636	150	const struct tomoyo_path_group *group)
7762fbff TH	151	{
	152	struct tomoyo_path_group_member *member;
	153	bool matched = false;
82e0f001 TH	154	list_for_each_entry_rcu(member, &group->member_list, head.list) {
82e0f001 TH	155	if (member->head.is_deleted)
7762fbff	156	continue;
3f629636 TH	157	if (!tomoyo_path_matches_pattern(pathname,
3f629636 TH	158	member->member_name))
7762fbff TH	159	continue;
	160	matched = true;
	161	break;
	162	}
	163	return matched;
	164	}