Commit | Line | Data |
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7c2ea22e TH |
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 | * | |
484ca79c TH |
83 | * Returns matched member's pathname if @pathname matches pathnames in @group, |
84 | * NULL otherwise. | |
7c2ea22e TH |
85 | * |
86 | * Caller holds tomoyo_read_lock(). | |
87 | */ | |
484ca79c TH |
88 | const struct tomoyo_path_info * |
89 | tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, | |
90 | const struct tomoyo_group *group) | |
7c2ea22e TH |
91 | { |
92 | struct tomoyo_path_group *member; | |
7c2ea22e TH |
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; | |
484ca79c | 98 | return member->member_name; |
7c2ea22e | 99 | } |
484ca79c | 100 | return NULL; |
7c2ea22e TH |
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 | } |