group.c revision a238cf5b89ed5285be8de56335665d023972f7d5 
1/*
2 * security/tomoyo/group.c
3 *
4 * Copyright (C) 2005-2010  NTT DATA CORPORATION
5 */
6
7#include <linux/slab.h>
8#include "common.h"
9
10static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
11				const struct tomoyo_acl_head *b)
12{
13	return container_of(a, struct tomoyo_path_group, head)->member_name ==
14		container_of(b, struct tomoyo_path_group, head)->member_name;
15}
16
17static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
18				  const struct tomoyo_acl_head *b)
19{
20	return !memcmp(&container_of(a, struct tomoyo_number_group, head)
21		       ->number,
22		       &container_of(b, struct tomoyo_number_group, head)
23		       ->number,
24		       sizeof(container_of(a, struct tomoyo_number_group, head)
25			      ->number));
26}
27
28/**
29 * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
30 *
31 * @param: Pointer to "struct tomoyo_acl_param".
32 * @type:      Type of this group.
33 *
34 * Returns 0 on success, negative value otherwise.
35 */
36int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
37{
38	struct tomoyo_group *group = tomoyo_get_group(param, type);
39	int error = -EINVAL;
40	if (!group)
41		return -ENOMEM;
42	param->list = &group->member_list;
43	if (type == TOMOYO_PATH_GROUP) {
44		struct tomoyo_path_group e = { };
45		e.member_name = tomoyo_get_name(tomoyo_read_token(param));
46		if (!e.member_name) {
47			error = -ENOMEM;
48			goto out;
49		}
50		error = tomoyo_update_policy(&e.head, sizeof(e), param,
51					  tomoyo_same_path_group);
52		tomoyo_put_name(e.member_name);
53	} else if (type == TOMOYO_NUMBER_GROUP) {
54		struct tomoyo_number_group e = { };
55		if (param->data[0] == '@' ||
56		    !tomoyo_parse_number_union(param, &e.number))
57			goto out;
58		error = tomoyo_update_policy(&e.head, sizeof(e), param,
59					  tomoyo_same_number_group);
60		/*
61		 * tomoyo_put_number_union() is not needed because
62		 * param->data[0] != '@'.
63		 */
64	}
65out:
66	tomoyo_put_group(group);
67	return error;
68}
69
70/**
71 * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
72 *
73 * @pathname:        The name of pathname.
74 * @group:           Pointer to "struct tomoyo_path_group".
75 *
76 * Returns matched member's pathname if @pathname matches pathnames in @group,
77 * NULL otherwise.
78 *
79 * Caller holds tomoyo_read_lock().
80 */
81const struct tomoyo_path_info *
82tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
83			  const struct tomoyo_group *group)
84{
85	struct tomoyo_path_group *member;
86	list_for_each_entry_rcu(member, &group->member_list, head.list) {
87		if (member->head.is_deleted)
88			continue;
89		if (!tomoyo_path_matches_pattern(pathname, member->member_name))
90			continue;
91		return member->member_name;
92	}
93	return NULL;
94}
95
96/**
97 * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
98 *
99 * @min:   Min number.
100 * @max:   Max number.
101 * @group: Pointer to "struct tomoyo_number_group".
102 *
103 * Returns true if @min and @max partially overlaps @group, false otherwise.
104 *
105 * Caller holds tomoyo_read_lock().
106 */
107bool tomoyo_number_matches_group(const unsigned long min,
108				 const unsigned long max,
109				 const struct tomoyo_group *group)
110{
111	struct tomoyo_number_group *member;
112	bool matched = false;
113	list_for_each_entry_rcu(member, &group->member_list, head.list) {
114		if (member->head.is_deleted)
115			continue;
116		if (min > member->number.values[1] ||
117		    max < member->number.values[0])
118			continue;
119		matched = true;
120		break;
121	}
122	return matched;
123}
124