group.c revision 059d84dbb3897d4ee494a9c842c5dda54316cb47 
1/*
2 * security/tomoyo/group.c
3 *
4 * Copyright (C) 2005-2011  NTT DATA CORPORATION
5 */
6
7#include <linux/slab.h>
8#include "common.h"
9
10/**
11 * tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
12 *
13 * @a: Pointer to "struct tomoyo_acl_head".
14 * @b: Pointer to "struct tomoyo_acl_head".
15 *
16 * Returns true if @a == @b, false otherwise.
17 */
18static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
19				   const struct tomoyo_acl_head *b)
20{
21	return container_of(a, struct tomoyo_path_group, head)->member_name ==
22		container_of(b, struct tomoyo_path_group, head)->member_name;
23}
24
25/**
26 * tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
27 *
28 * @a: Pointer to "struct tomoyo_acl_head".
29 * @b: Pointer to "struct tomoyo_acl_head".
30 *
31 * Returns true if @a == @b, false otherwise.
32 */
33static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
34				     const struct tomoyo_acl_head *b)
35{
36	return !memcmp(&container_of(a, struct tomoyo_number_group, head)
37		       ->number,
38		       &container_of(b, struct tomoyo_number_group, head)
39		       ->number,
40		       sizeof(container_of(a, struct tomoyo_number_group, head)
41			      ->number));
42}
43
44/**
45 * tomoyo_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
46 *
47 * @a: Pointer to "struct tomoyo_acl_head".
48 * @b: Pointer to "struct tomoyo_acl_head".
49 *
50 * Returns true if @a == @b, false otherwise.
51 */
52static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
53				      const struct tomoyo_acl_head *b)
54{
55	const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
56							     head);
57	const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
58							     head);
59
60	return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
61}
62
63/**
64 * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
65 *
66 * @param: Pointer to "struct tomoyo_acl_param".
67 * @type:  Type of this group.
68 *
69 * Returns 0 on success, negative value otherwise.
70 */
71int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
72{
73	struct tomoyo_group *group = tomoyo_get_group(param, type);
74	int error = -EINVAL;
75	if (!group)
76		return -ENOMEM;
77	param->list = &group->member_list;
78	if (type == TOMOYO_PATH_GROUP) {
79		struct tomoyo_path_group e = { };
80		e.member_name = tomoyo_get_name(tomoyo_read_token(param));
81		if (!e.member_name) {
82			error = -ENOMEM;
83			goto out;
84		}
85		error = tomoyo_update_policy(&e.head, sizeof(e), param,
86					  tomoyo_same_path_group);
87		tomoyo_put_name(e.member_name);
88	} else if (type == TOMOYO_NUMBER_GROUP) {
89		struct tomoyo_number_group e = { };
90		if (param->data[0] == '@' ||
91		    !tomoyo_parse_number_union(param, &e.number))
92			goto out;
93		error = tomoyo_update_policy(&e.head, sizeof(e), param,
94					  tomoyo_same_number_group);
95		/*
96		 * tomoyo_put_number_union() is not needed because
97		 * param->data[0] != '@'.
98		 */
99	} else {
100		struct tomoyo_address_group e = { };
101
102		if (param->data[0] == '@' ||
103		    !tomoyo_parse_ipaddr_union(param, &e.address))
104			goto out;
105		error = tomoyo_update_policy(&e.head, sizeof(e), param,
106					     tomoyo_same_address_group);
107	}
108out:
109	tomoyo_put_group(group);
110	return error;
111}
112
113/**
114 * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
115 *
116 * @pathname: The name of pathname.
117 * @group:    Pointer to "struct tomoyo_path_group".
118 *
119 * Returns matched member's pathname if @pathname matches pathnames in @group,
120 * NULL otherwise.
121 *
122 * Caller holds tomoyo_read_lock().
123 */
124const struct tomoyo_path_info *
125tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
126			  const struct tomoyo_group *group)
127{
128	struct tomoyo_path_group *member;
129	list_for_each_entry_rcu(member, &group->member_list, head.list) {
130		if (member->head.is_deleted)
131			continue;
132		if (!tomoyo_path_matches_pattern(pathname, member->member_name))
133			continue;
134		return member->member_name;
135	}
136	return NULL;
137}
138
139/**
140 * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
141 *
142 * @min:   Min number.
143 * @max:   Max number.
144 * @group: Pointer to "struct tomoyo_number_group".
145 *
146 * Returns true if @min and @max partially overlaps @group, false otherwise.
147 *
148 * Caller holds tomoyo_read_lock().
149 */
150bool tomoyo_number_matches_group(const unsigned long min,
151				 const unsigned long max,
152				 const struct tomoyo_group *group)
153{
154	struct tomoyo_number_group *member;
155	bool matched = false;
156	list_for_each_entry_rcu(member, &group->member_list, head.list) {
157		if (member->head.is_deleted)
158			continue;
159		if (min > member->number.values[1] ||
160		    max < member->number.values[0])
161			continue;
162		matched = true;
163		break;
164	}
165	return matched;
166}
167
168/**
169 * tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
170 *
171 * @is_ipv6: True if @address is an IPv6 address.
172 * @address: An IPv4 or IPv6 address.
173 * @group:   Pointer to "struct tomoyo_address_group".
174 *
175 * Returns true if @address matches addresses in @group group, false otherwise.
176 *
177 * Caller holds tomoyo_read_lock().
178 */
179bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
180				  const struct tomoyo_group *group)
181{
182	struct tomoyo_address_group *member;
183	bool matched = false;
184	const u8 size = is_ipv6 ? 16 : 4;
185
186	list_for_each_entry_rcu(member, &group->member_list, head.list) {
187		if (member->head.is_deleted)
188			continue;
189		if (member->address.is_ipv6 != is_ipv6)
190			continue;
191		if (memcmp(&member->address.ip[0], address, size) > 0 ||
192		    memcmp(address, &member->address.ip[1], size) > 0)
193			continue;
194		matched = true;
195		break;
196	}
197	return matched;
198}
199