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/*
* 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 matched member's pathname if @pathname matches pathnames in @group,
* NULL otherwise.
*
* Caller holds tomoyo_read_lock().
*/
const struct tomoyo_path_info *
tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
const struct tomoyo_group *group)
{
struct tomoyo_path_group *member;
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;
return member->member_name;
}
return NULL;
}
/**
* 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;
}
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