131 lines
3.6 KiB
C
131 lines
3.6 KiB
C
/*
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* security/tomoyo/group.c
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*
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* Copyright (C) 2005-2010 NTT DATA CORPORATION
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*/
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#include <linux/slab.h>
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#include "common.h"
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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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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_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
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*
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* @data: String to parse.
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* @is_delete: True if it is a delete request.
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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(char *data, const bool is_delete, const u8 type)
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{
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struct tomoyo_group *group;
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struct list_head *member;
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char *w[2];
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int error = -EINVAL;
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if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
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return -EINVAL;
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group = tomoyo_get_group(w[0], type);
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if (!group)
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return -ENOMEM;
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member = &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(w[1]);
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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), is_delete,
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member, 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 (w[1][0] == '@'
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|| !tomoyo_parse_number_union(w[1], &e.number)
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|| e.number.values[0] > e.number.values[1])
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goto out;
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error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
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member, tomoyo_same_number_group);
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/*
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* tomoyo_put_number_union() is not needed because
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* w[1][0] != '@'.
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*/
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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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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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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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