// SPDX-License-Identifier: GPL-2.0
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/*
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* security/tomoyo/group.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include <linux/slab.h>
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#include <linux/rculist.h>
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#include "common.h"
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/**
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* tomoyo_same_path_group - Check for duplicated "struct tomoyo_path_group" entry.
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*
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* @a: Pointer to "struct tomoyo_acl_head".
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* @b: Pointer to "struct tomoyo_acl_head".
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*
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* Returns true if @a == @b, false otherwise.
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*/
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static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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return container_of(a, struct tomoyo_path_group, head)->member_name ==
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container_of(b, struct tomoyo_path_group, head)->member_name;
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}
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/**
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* tomoyo_same_number_group - Check for duplicated "struct tomoyo_number_group" entry.
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*
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* @a: Pointer to "struct tomoyo_acl_head".
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* @b: Pointer to "struct tomoyo_acl_head".
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*
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* Returns true if @a == @b, false otherwise.
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*/
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static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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return !memcmp(&container_of(a, struct tomoyo_number_group, head)
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->number,
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&container_of(b, struct tomoyo_number_group, head)
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->number,
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sizeof(container_of(a, struct tomoyo_number_group, head)
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->number));
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}
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/**
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* tomoyo_same_address_group - Check for duplicated "struct tomoyo_address_group" entry.
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*
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* @a: Pointer to "struct tomoyo_acl_head".
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* @b: Pointer to "struct tomoyo_acl_head".
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*
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* Returns true if @a == @b, false otherwise.
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*/
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static bool tomoyo_same_address_group(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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const struct tomoyo_address_group *p1 = container_of(a, typeof(*p1),
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head);
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const struct tomoyo_address_group *p2 = container_of(b, typeof(*p2),
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head);
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return tomoyo_same_ipaddr_union(&p1->address, &p2->address);
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}
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/**
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* tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
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*
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* @param: Pointer to "struct tomoyo_acl_param".
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* @type: Type of this group.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type)
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{
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struct tomoyo_group *group = tomoyo_get_group(param, type);
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int error = -EINVAL;
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if (!group)
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return -ENOMEM;
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param->list = &group->member_list;
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if (type == TOMOYO_PATH_GROUP) {
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struct tomoyo_path_group e = { };
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e.member_name = tomoyo_get_name(tomoyo_read_token(param));
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if (!e.member_name) {
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error = -ENOMEM;
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goto out;
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}
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error = tomoyo_update_policy(&e.head, sizeof(e), param,
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tomoyo_same_path_group);
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tomoyo_put_name(e.member_name);
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} else if (type == TOMOYO_NUMBER_GROUP) {
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struct tomoyo_number_group e = { };
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if (param->data[0] == '@' ||
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!tomoyo_parse_number_union(param, &e.number))
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goto out;
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error = tomoyo_update_policy(&e.head, sizeof(e), param,
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tomoyo_same_number_group);
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/*
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* tomoyo_put_number_union() is not needed because
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* param->data[0] != '@'.
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*/
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} else {
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struct tomoyo_address_group e = { };
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if (param->data[0] == '@' ||
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!tomoyo_parse_ipaddr_union(param, &e.address))
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goto out;
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error = tomoyo_update_policy(&e.head, sizeof(e), param,
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tomoyo_same_address_group);
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}
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out:
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tomoyo_put_group(group);
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return error;
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}
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/**
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* tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
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*
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* @pathname: The name of pathname.
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* @group: Pointer to "struct tomoyo_path_group".
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*
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* Returns matched member's pathname if @pathname matches pathnames in @group,
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* NULL otherwise.
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*
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* Caller holds tomoyo_read_lock().
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*/
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const struct tomoyo_path_info *
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tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
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const struct tomoyo_group *group)
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{
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struct tomoyo_path_group *member;
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list_for_each_entry_rcu(member, &group->member_list, head.list,
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srcu_read_lock_held(&tomoyo_ss)) {
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if (member->head.is_deleted)
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continue;
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if (!tomoyo_path_matches_pattern(pathname, member->member_name))
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continue;
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return member->member_name;
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}
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return NULL;
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}
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/**
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* tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
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*
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* @min: Min number.
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* @max: Max number.
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* @group: Pointer to "struct tomoyo_number_group".
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*
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* Returns true if @min and @max partially overlaps @group, false otherwise.
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*
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* Caller holds tomoyo_read_lock().
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*/
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bool tomoyo_number_matches_group(const unsigned long min,
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const unsigned long max,
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const struct tomoyo_group *group)
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{
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struct tomoyo_number_group *member;
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bool matched = false;
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list_for_each_entry_rcu(member, &group->member_list, head.list,
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srcu_read_lock_held(&tomoyo_ss)) {
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if (member->head.is_deleted)
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continue;
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if (min > member->number.values[1] ||
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max < member->number.values[0])
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continue;
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matched = true;
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break;
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}
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return matched;
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}
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/**
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* tomoyo_address_matches_group - Check whether the given address matches members of the given address group.
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*
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* @is_ipv6: True if @address is an IPv6 address.
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* @address: An IPv4 or IPv6 address.
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* @group: Pointer to "struct tomoyo_address_group".
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*
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* Returns true if @address matches addresses in @group group, false otherwise.
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*
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* Caller holds tomoyo_read_lock().
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*/
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bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address,
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const struct tomoyo_group *group)
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{
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struct tomoyo_address_group *member;
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bool matched = false;
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const u8 size = is_ipv6 ? 16 : 4;
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list_for_each_entry_rcu(member, &group->member_list, head.list,
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srcu_read_lock_held(&tomoyo_ss)) {
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if (member->head.is_deleted)
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continue;
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if (member->address.is_ipv6 != is_ipv6)
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continue;
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if (memcmp(&member->address.ip[0], address, size) > 0 ||
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memcmp(address, &member->address.ip[1], size) > 0)
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continue;
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matched = true;
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break;
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}
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return matched;
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}
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