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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 | */ |
18 | static 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 | */ |
33 | static 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 | */ |
52 | static 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 | */ |
71 | int 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 | } |
108 | out: |
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 | */ |
124 | const struct tomoyo_path_info * |
125 | tomoyo_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 | */ |
150 | bool 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 | */ |
179 | bool 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 |
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