]>
Commit | Line | Data |
---|---|---|
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; | |
75093152 | 25 | if (!tomoyo_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 | ||
36f5e1ff TH |
57 | static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a, |
58 | const struct tomoyo_acl_head *b) | |
59 | { | |
60 | return container_of(a, struct tomoyo_path_group_member, head) | |
61 | ->member_name == | |
62 | container_of(b, struct tomoyo_path_group_member, head) | |
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 | { | |
76 | struct tomoyo_path_group *group; | |
7762fbff TH |
77 | struct tomoyo_path_group_member e = { }; |
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); | |
93 | tomoyo_put_path_group(group); | |
94 | return error; | |
95 | } | |
96 | ||
97 | /** | |
98 | * tomoyo_read_path_group_policy - Read "struct tomoyo_path_group" list. | |
99 | * | |
100 | * @head: Pointer to "struct tomoyo_io_buffer". | |
101 | * | |
102 | * Returns true on success, false otherwise. | |
103 | * | |
104 | * Caller holds tomoyo_read_lock(). | |
105 | */ | |
106 | bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer *head) | |
107 | { | |
108 | struct list_head *gpos; | |
109 | struct list_head *mpos; | |
110 | list_for_each_cookie(gpos, head->read_var1, &tomoyo_path_group_list) { | |
111 | struct tomoyo_path_group *group; | |
112 | group = list_entry(gpos, struct tomoyo_path_group, list); | |
113 | list_for_each_cookie(mpos, head->read_var2, | |
114 | &group->member_list) { | |
115 | struct tomoyo_path_group_member *member; | |
116 | member = list_entry(mpos, | |
117 | struct tomoyo_path_group_member, | |
82e0f001 TH |
118 | head.list); |
119 | if (member->head.is_deleted) | |
7762fbff TH |
120 | continue; |
121 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_PATH_GROUP | |
122 | "%s %s\n", | |
123 | group->group_name->name, | |
124 | member->member_name->name)) | |
125 | return false; | |
126 | } | |
127 | } | |
128 | return true; | |
129 | } | |
130 | ||
131 | /** | |
132 | * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group. | |
133 | * | |
134 | * @pathname: The name of pathname. | |
135 | * @group: Pointer to "struct tomoyo_path_group". | |
7762fbff TH |
136 | * |
137 | * Returns true if @pathname matches pathnames in @group, false otherwise. | |
138 | * | |
139 | * Caller holds tomoyo_read_lock(). | |
140 | */ | |
141 | bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, | |
3f629636 | 142 | const struct tomoyo_path_group *group) |
7762fbff TH |
143 | { |
144 | struct tomoyo_path_group_member *member; | |
145 | bool matched = false; | |
82e0f001 TH |
146 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
147 | if (member->head.is_deleted) | |
7762fbff | 148 | continue; |
3f629636 TH |
149 | if (!tomoyo_path_matches_pattern(pathname, |
150 | member->member_name)) | |
7762fbff TH |
151 | continue; |
152 | matched = true; | |
153 | break; | |
154 | } | |
155 | return matched; | |
156 | } |