summaryrefslogtreecommitdiffstats
path: root/security/tomoyo/group.c
blob: 3f0a2abf65ccc13e343825900699854446825c53 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * security/tomoyo/group.c
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 */

#include <linux/slab.h>
#include "common.h"

static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
				const struct tomoyo_acl_head *b)
{
	return container_of(a, struct tomoyo_path_group, head)->member_name ==
		container_of(b, struct tomoyo_path_group, head)->member_name;
}

static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
				  const struct tomoyo_acl_head *b)
{
	return !memcmp(&container_of(a, struct tomoyo_number_group, head)
		       ->number,
		       &container_of(b, struct tomoyo_number_group, head)
		       ->number,
		       sizeof(container_of(a, struct tomoyo_number_group, head)
			      ->number));
}

/**
 * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
 *
 * @data:      String to parse.
 * @is_delete: True if it is a delete request.
 * @type:      Type of this group.
 *
 * Returns 0 on success, negative value otherwise.
 */
int tomoyo_write_group(char *data, const bool is_delete, const u8 type)
{
	struct tomoyo_group *group;
	struct list_head *member;
	char *w[2];
	int error = -EINVAL;
	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
		return -EINVAL;
	group = tomoyo_get_group(w[0], type);
	if (!group)
		return -ENOMEM;
	member = &group->member_list;
	if (type == TOMOYO_PATH_GROUP) {
		struct tomoyo_path_group e = { };
		e.member_name = tomoyo_get_name(w[1]);
		if (!e.member_name) {
			error = -ENOMEM;
			goto out;
		}
		error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
					     member, tomoyo_same_path_group);
		tomoyo_put_name(e.member_name);
	} else if (type == TOMOYO_NUMBER_GROUP) {
		struct tomoyo_number_group e = { };
		if (w[1][0] == '@'
		    || !tomoyo_parse_number_union(w[1], &e.number)
		    || e.number.values[0] > e.number.values[1])
			goto out;
		error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
					     member, tomoyo_same_number_group);
		/*
		 * tomoyo_put_number_union() is not needed because
		 * w[1][0] != '@'.
		 */
	}
 out:
	tomoyo_put_group(group);
	return error;
}

/**
 * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
 *
 * @pathname:        The name of pathname.
 * @group:           Pointer to "struct tomoyo_path_group".
 *
 * Returns true if @pathname matches pathnames in @group, false otherwise.
 *
 * Caller holds tomoyo_read_lock().
 */
bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
			       const struct tomoyo_group *group)
{
	struct tomoyo_path_group *member;
	bool matched = false;
	list_for_each_entry_rcu(member, &group->member_list, head.list) {
		if (member->head.is_deleted)
			continue;
		if (!tomoyo_path_matches_pattern(pathname, member->member_name))
			continue;
		matched = true;
		break;
	}
	return matched;
}

/**
 * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
 *
 * @min:   Min number.
 * @max:   Max number.
 * @group: Pointer to "struct tomoyo_number_group".
 *
 * Returns true if @min and @max partially overlaps @group, false otherwise.
 *
 * Caller holds tomoyo_read_lock().
 */
bool tomoyo_number_matches_group(const unsigned long min,
				 const unsigned long max,
				 const struct tomoyo_group *group)
{
	struct tomoyo_number_group *member;
	bool matched = false;
	list_for_each_entry_rcu(member, &group->member_list, head.list) {
		if (member->head.is_deleted)
			continue;
		if (min > member->number.values[1] ||
		    max < member->number.values[0])
			continue;
		matched = true;
		break;
	}
	return matched;
}
OpenPOWER on IntegriCloud