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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 | |
10 | static 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 | |
17 | static 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 | * @data: String to parse. |
32 | * @is_delete: True if it is a delete request. |
33 | * @type: Type of this group. |
34 | * |
35 | * Returns 0 on success, negative value otherwise. |
36 | */ |
37 | int tomoyo_write_group(char *data, const bool is_delete, const u8 type) |
38 | { |
39 | struct tomoyo_group *group; |
40 | struct list_head *member; |
41 | char *w[2]; |
42 | int error = -EINVAL; |
43 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) |
44 | return -EINVAL; |
45 | group = tomoyo_get_group(w[0], type); |
46 | if (!group) |
47 | return -ENOMEM; |
48 | member = &group->member_list; |
49 | if (type == TOMOYO_PATH_GROUP) { |
50 | struct tomoyo_path_group e = { }; |
51 | e.member_name = tomoyo_get_name(w[1]); |
52 | if (!e.member_name) { |
53 | error = -ENOMEM; |
54 | goto out; |
55 | } |
56 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
57 | member, tomoyo_same_path_group); |
58 | tomoyo_put_name(e.member_name); |
59 | } else if (type == TOMOYO_NUMBER_GROUP) { |
60 | struct tomoyo_number_group e = { }; |
61 | if (w[1][0] == '@' |
62 | || !tomoyo_parse_number_union(w[1], &e.number) |
63 | || e.number.values[0] > e.number.values[1]) |
64 | goto out; |
65 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
66 | member, tomoyo_same_number_group); |
67 | /* |
68 | * tomoyo_put_number_union() is not needed because |
69 | * w[1][0] != '@'. |
70 | */ |
71 | } |
72 | out: |
73 | tomoyo_put_group(group); |
74 | return error; |
75 | } |
76 | |
77 | /** |
78 | * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group. |
79 | * |
80 | * @pathname: The name of pathname. |
81 | * @group: Pointer to "struct tomoyo_path_group". |
82 | * |
83 | * Returns matched member's pathname if @pathname matches pathnames in @group, |
84 | * NULL otherwise. |
85 | * |
86 | * Caller holds tomoyo_read_lock(). |
87 | */ |
88 | const struct tomoyo_path_info * |
89 | tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, |
90 | const struct tomoyo_group *group) |
91 | { |
92 | struct tomoyo_path_group *member; |
93 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
94 | if (member->head.is_deleted) |
95 | continue; |
96 | if (!tomoyo_path_matches_pattern(pathname, member->member_name)) |
97 | continue; |
98 | return member->member_name; |
99 | } |
100 | return NULL; |
101 | } |
102 | |
103 | /** |
104 | * tomoyo_number_matches_group - Check whether the given number matches members of the given number group. |
105 | * |
106 | * @min: Min number. |
107 | * @max: Max number. |
108 | * @group: Pointer to "struct tomoyo_number_group". |
109 | * |
110 | * Returns true if @min and @max partially overlaps @group, false otherwise. |
111 | * |
112 | * Caller holds tomoyo_read_lock(). |
113 | */ |
114 | bool tomoyo_number_matches_group(const unsigned long min, |
115 | const unsigned long max, |
116 | const struct tomoyo_group *group) |
117 | { |
118 | struct tomoyo_number_group *member; |
119 | bool matched = false; |
120 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
121 | if (member->head.is_deleted) |
122 | continue; |
123 | if (min > member->number.values[1] || |
124 | max < member->number.values[0]) |
125 | continue; |
126 | matched = true; |
127 | break; |
128 | } |
129 | return matched; |
130 | } |
131 |
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