TOMOYO: Merge path_group and number_group.
[linux-3.10.git] / security / tomoyo / group.c
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 true if @pathname matches pathnames in @group, false otherwise.
84  *
85  * Caller holds tomoyo_read_lock().
86  */
87 bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
88                                const struct tomoyo_group *group)
89 {
90         struct tomoyo_path_group *member;
91         bool matched = false;
92         list_for_each_entry_rcu(member, &group->member_list, head.list) {
93                 if (member->head.is_deleted)
94                         continue;
95                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
96                         continue;
97                 matched = true;
98                 break;
99         }
100         return matched;
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 }