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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" | |
9b244373 | 9 | /* The list for "struct tomoyo_path_group". */ |
7762fbff TH |
10 | LIST_HEAD(tomoyo_path_group_list); |
11 | ||
12 | /** | |
13 | * tomoyo_get_path_group - Allocate memory for "struct tomoyo_path_group". | |
14 | * | |
15 | * @group_name: The name of pathname group. | |
16 | * | |
17 | * Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise. | |
18 | */ | |
19 | struct tomoyo_path_group *tomoyo_get_path_group(const char *group_name) | |
20 | { | |
21 | struct tomoyo_path_group *entry = NULL; | |
22 | struct tomoyo_path_group *group = NULL; | |
23 | const struct tomoyo_path_info *saved_group_name; | |
24 | int error = -ENOMEM; | |
3f629636 | 25 | if (!tomoyo_is_correct_word(group_name)) |
7762fbff TH |
26 | return NULL; |
27 | saved_group_name = tomoyo_get_name(group_name); | |
28 | if (!saved_group_name) | |
29 | return NULL; | |
30 | entry = kzalloc(sizeof(*entry), GFP_NOFS); | |
31 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
32 | goto out; | |
33 | list_for_each_entry_rcu(group, &tomoyo_path_group_list, list) { | |
34 | if (saved_group_name != group->group_name) | |
35 | continue; | |
36 | atomic_inc(&group->users); | |
37 | error = 0; | |
38 | break; | |
39 | } | |
40 | if (error && tomoyo_memory_ok(entry)) { | |
41 | INIT_LIST_HEAD(&entry->member_list); | |
42 | entry->group_name = saved_group_name; | |
43 | saved_group_name = NULL; | |
44 | atomic_set(&entry->users, 1); | |
45 | list_add_tail_rcu(&entry->list, &tomoyo_path_group_list); | |
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 | ||
57 | /** | |
58 | * tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list. | |
59 | * | |
60 | * @data: String to parse. | |
61 | * @is_delete: True if it is a delete request. | |
62 | * | |
63 | * Returns 0 on success, nagative value otherwise. | |
64 | */ | |
65 | int tomoyo_write_path_group_policy(char *data, const bool is_delete) | |
66 | { | |
67 | struct tomoyo_path_group *group; | |
68 | struct tomoyo_path_group_member *member; | |
69 | struct tomoyo_path_group_member e = { }; | |
70 | int error = is_delete ? -ENOENT : -ENOMEM; | |
71 | char *w[2]; | |
72 | if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) | |
73 | return -EINVAL; | |
74 | group = tomoyo_get_path_group(w[0]); | |
75 | if (!group) | |
76 | return -ENOMEM; | |
77 | e.member_name = tomoyo_get_name(w[1]); | |
78 | if (!e.member_name) | |
79 | goto out; | |
80 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
81 | goto out; | |
82e0f001 | 82 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
7762fbff TH |
83 | if (member->member_name != e.member_name) |
84 | continue; | |
82e0f001 | 85 | member->head.is_deleted = is_delete; |
7762fbff TH |
86 | error = 0; |
87 | break; | |
88 | } | |
89 | if (!is_delete && error) { | |
90 | struct tomoyo_path_group_member *entry = | |
91 | tomoyo_commit_ok(&e, sizeof(e)); | |
92 | if (entry) { | |
82e0f001 TH |
93 | list_add_tail_rcu(&entry->head.list, |
94 | &group->member_list); | |
7762fbff TH |
95 | error = 0; |
96 | } | |
97 | } | |
98 | mutex_unlock(&tomoyo_policy_lock); | |
99 | out: | |
100 | tomoyo_put_name(e.member_name); | |
101 | tomoyo_put_path_group(group); | |
102 | return error; | |
103 | } | |
104 | ||
105 | /** | |
106 | * tomoyo_read_path_group_policy - Read "struct tomoyo_path_group" list. | |
107 | * | |
108 | * @head: Pointer to "struct tomoyo_io_buffer". | |
109 | * | |
110 | * Returns true on success, false otherwise. | |
111 | * | |
112 | * Caller holds tomoyo_read_lock(). | |
113 | */ | |
114 | bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer *head) | |
115 | { | |
116 | struct list_head *gpos; | |
117 | struct list_head *mpos; | |
118 | list_for_each_cookie(gpos, head->read_var1, &tomoyo_path_group_list) { | |
119 | struct tomoyo_path_group *group; | |
120 | group = list_entry(gpos, struct tomoyo_path_group, list); | |
121 | list_for_each_cookie(mpos, head->read_var2, | |
122 | &group->member_list) { | |
123 | struct tomoyo_path_group_member *member; | |
124 | member = list_entry(mpos, | |
125 | struct tomoyo_path_group_member, | |
82e0f001 TH |
126 | head.list); |
127 | if (member->head.is_deleted) | |
7762fbff TH |
128 | continue; |
129 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_PATH_GROUP | |
130 | "%s %s\n", | |
131 | group->group_name->name, | |
132 | member->member_name->name)) | |
133 | return false; | |
134 | } | |
135 | } | |
136 | return true; | |
137 | } | |
138 | ||
139 | /** | |
140 | * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group. | |
141 | * | |
142 | * @pathname: The name of pathname. | |
143 | * @group: Pointer to "struct tomoyo_path_group". | |
7762fbff TH |
144 | * |
145 | * Returns true if @pathname matches pathnames in @group, false otherwise. | |
146 | * | |
147 | * Caller holds tomoyo_read_lock(). | |
148 | */ | |
149 | bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, | |
3f629636 | 150 | const struct tomoyo_path_group *group) |
7762fbff TH |
151 | { |
152 | struct tomoyo_path_group_member *member; | |
153 | bool matched = false; | |
82e0f001 TH |
154 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
155 | if (member->head.is_deleted) | |
7762fbff | 156 | continue; |
3f629636 TH |
157 | if (!tomoyo_path_matches_pattern(pathname, |
158 | member->member_name)) | |
7762fbff TH |
159 | continue; |
160 | matched = true; | |
161 | break; | |
162 | } | |
163 | return matched; | |
164 | } |