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/*
* security/tomoyo/group.c
*
* Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include <linux/slab.h>
#include <linux/rculist.h>
#include "common.h"
/**
* tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
*
* @a: Pointer to "struct tomoyo_acl_head".
* @b: Pointer to "struct tomoyo_acl_head".
*
* Returns true if @a == @b, false otherwise.
*/
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;
}
/**
* tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
*
* @a: Pointer to "struct tomoyo_acl_head".
* @b: Pointer to "struct tomoyo_acl_head".
*
* Returns true if @a == @b, false otherwise.
*/
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_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
*
* @a: Pointer to "struct tomoyo_acl_head".
* @b: Pointer to "struct tomoyo_acl_head".
*
* Returns true if @a == @b, false otherwise.
*/
static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
const struct tomoyo_acl_head *b)
{
const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
head);
const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
head);
return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
}
/**
* tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
*
* @param: Pointer to "struct tomoyo_acl_param".
* @type: Type of this group.
*
* Returns 0 on success, negative value otherwise.
*/
int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
{
struct tomoyo_group *group = tomoyo_get_group(param, type);
int error = -EINVAL;
if (!group)
return -ENOMEM;
param->list = &group->member_list;
if (type == TOMOYO_PATH_GROUP) {
struct tomoyo_path_group e = { };
e.member_name = tomoyo_get_name(tomoyo_read_token(param));
if (!e.member_name) {
error = -ENOMEM;
goto out;
}
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_path_group);
tomoyo_put_name(e.member_name);
} else if (type == TOMOYO_NUMBER_GROUP) {
struct tomoyo_number_group e = { };
if (param->data[0] == '@' ||
!tomoyo_parse_number_union(param, &e.number))
goto out;
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_number_group);
/*
* tomoyo_put_number_union() is not needed because
* param->data[0] != '@'.
*/
} else {
struct tomoyo_address_group e = { };
if (param->data[0] == '@' ||
!tomoyo_parse_ipaddr_union(param, &e.address))
goto out;
error = tomoyo_update_policy(&e.head, sizeof(e), param,
tomoyo_same_address_group);
}
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;
}
/**
* tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
*
* @is_ipv6: True if @address is an IPv6 address.
* @address: An IPv4 or IPv6 address.
* @group: Pointer to "struct tomoyo_address_group".
*
* Returns true if @address matches addresses in @group group, false otherwise.
*
* Caller holds tomoyo_read_lock().
*/
bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
const struct tomoyo_group *group)
{
struct tomoyo_address_group *member;
bool matched = false;
const u8 size = is_ipv6 ? 16 : 4;
list_for_each_entry_rcu(member, &group->member_list, head.list) {
if (member->head.is_deleted)
continue;
if (member->address.is_ipv6 != is_ipv6)
continue;
if (memcmp(&member->address.ip[0], address, size) > 0 ||
memcmp(address, &member->address.ip[1], size) > 0)
continue;
matched = true;
break;
}
return matched;
}
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