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209 lines
5.8 KiB
209 lines
5.8 KiB
// 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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