Commit | Line | Data |
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7762fbff TH |
1 | /* |
2 | * security/tomoyo/path_group.c | |
3 | * | |
4 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
5 | */ | |
6 | ||
7 | #include <linux/slab.h> | |
8 | #include "common.h" | |
7762fbff TH |
9 | |
10 | /** | |
a98aa4de | 11 | * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group". |
7762fbff TH |
12 | * |
13 | * @group_name: The name of pathname group. | |
14 | * | |
15 | * Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise. | |
16 | */ | |
a98aa4de | 17 | struct tomoyo_group *tomoyo_get_path_group(const char *group_name) |
7762fbff | 18 | { |
a98aa4de TH |
19 | struct tomoyo_group *entry = NULL; |
20 | struct tomoyo_group *group = NULL; | |
7762fbff TH |
21 | const struct tomoyo_path_info *saved_group_name; |
22 | int error = -ENOMEM; | |
75093152 | 23 | if (!tomoyo_correct_word(group_name)) |
7762fbff TH |
24 | return NULL; |
25 | saved_group_name = tomoyo_get_name(group_name); | |
26 | if (!saved_group_name) | |
27 | return NULL; | |
28 | entry = kzalloc(sizeof(*entry), GFP_NOFS); | |
29 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
30 | goto out; | |
a230f9e7 TH |
31 | list_for_each_entry_rcu(group, &tomoyo_group_list[TOMOYO_PATH_GROUP], |
32 | list) { | |
7762fbff TH |
33 | if (saved_group_name != group->group_name) |
34 | continue; | |
35 | atomic_inc(&group->users); | |
36 | error = 0; | |
37 | break; | |
38 | } | |
39 | if (error && tomoyo_memory_ok(entry)) { | |
40 | INIT_LIST_HEAD(&entry->member_list); | |
41 | entry->group_name = saved_group_name; | |
42 | saved_group_name = NULL; | |
43 | atomic_set(&entry->users, 1); | |
a230f9e7 TH |
44 | list_add_tail_rcu(&entry->list, |
45 | &tomoyo_group_list[TOMOYO_PATH_GROUP]); | |
7762fbff TH |
46 | group = entry; |
47 | entry = NULL; | |
48 | error = 0; | |
49 | } | |
50 | mutex_unlock(&tomoyo_policy_lock); | |
51 | out: | |
52 | tomoyo_put_name(saved_group_name); | |
53 | kfree(entry); | |
54 | return !error ? group : NULL; | |
55 | } | |
56 | ||
36f5e1ff TH |
57 | static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a, |
58 | const struct tomoyo_acl_head *b) | |
59 | { | |
a98aa4de | 60 | return container_of(a, struct tomoyo_path_group, head) |
36f5e1ff | 61 | ->member_name == |
a98aa4de | 62 | container_of(b, struct tomoyo_path_group, head) |
36f5e1ff TH |
63 | ->member_name; |
64 | } | |
65 | ||
7762fbff TH |
66 | /** |
67 | * tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list. | |
68 | * | |
69 | * @data: String to parse. | |
70 | * @is_delete: True if it is a delete request. | |
71 | * | |
72 | * Returns 0 on success, nagative value otherwise. | |
73 | */ | |
74 | int tomoyo_write_path_group_policy(char *data, const bool is_delete) | |
75 | { | |
a98aa4de TH |
76 | struct tomoyo_group *group; |
77 | struct tomoyo_path_group e = { }; | |
7762fbff TH |
78 | int error = is_delete ? -ENOENT : -ENOMEM; |
79 | char *w[2]; | |
80 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
81 | return -EINVAL; | |
82 | group = tomoyo_get_path_group(w[0]); | |
83 | if (!group) | |
84 | return -ENOMEM; | |
85 | e.member_name = tomoyo_get_name(w[1]); | |
86 | if (!e.member_name) | |
87 | goto out; | |
36f5e1ff TH |
88 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
89 | &group->member_list, | |
90 | tomoyo_same_path_group); | |
7762fbff TH |
91 | out: |
92 | tomoyo_put_name(e.member_name); | |
a98aa4de | 93 | tomoyo_put_group(group); |
7762fbff TH |
94 | return error; |
95 | } | |
96 | ||
7762fbff TH |
97 | /** |
98 | * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group. | |
99 | * | |
100 | * @pathname: The name of pathname. | |
101 | * @group: Pointer to "struct tomoyo_path_group". | |
7762fbff TH |
102 | * |
103 | * Returns true if @pathname matches pathnames in @group, false otherwise. | |
104 | * | |
105 | * Caller holds tomoyo_read_lock(). | |
106 | */ | |
107 | bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, | |
a98aa4de | 108 | const struct tomoyo_group *group) |
7762fbff | 109 | { |
a98aa4de | 110 | struct tomoyo_path_group *member; |
7762fbff | 111 | bool matched = false; |
82e0f001 TH |
112 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
113 | if (member->head.is_deleted) | |
7762fbff | 114 | continue; |
3f629636 TH |
115 | if (!tomoyo_path_matches_pattern(pathname, |
116 | member->member_name)) | |
7762fbff TH |
117 | continue; |
118 | matched = true; | |
119 | break; | |
120 | } | |
121 | return matched; | |
122 | } |