123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
|
|
* security/tomoyo/path_group.c
|
|
*
|
|
* Copyright (C) 2005-2009 NTT DATA CORPORATION
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include "common.h"
|
|
|
|
/**
|
|
* tomoyo_get_group - Allocate memory for "struct tomoyo_path_group".
|
|
*
|
|
* @group_name: The name of pathname group.
|
|
*
|
|
* Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise.
|
|
*/
|
|
struct tomoyo_group *tomoyo_get_path_group(const char *group_name)
|
|
{
|
|
struct tomoyo_group *entry = NULL;
|
|
struct tomoyo_group *group = NULL;
|
|
const struct tomoyo_path_info *saved_group_name;
|
|
int error = -ENOMEM;
|
|
if (!tomoyo_correct_word(group_name))
|
|
return NULL;
|
|
saved_group_name = tomoyo_get_name(group_name);
|
|
if (!saved_group_name)
|
|
return NULL;
|
|
entry = kzalloc(sizeof(*entry), GFP_NOFS);
|
|
if (mutex_lock_interruptible(&tomoyo_policy_lock))
|
|
goto out;
|
|
list_for_each_entry_rcu(group, &tomoyo_group_list[TOMOYO_PATH_GROUP],
|
|
list) {
|
|
if (saved_group_name != group->group_name)
|
|
continue;
|
|
atomic_inc(&group->users);
|
|
error = 0;
|
|
break;
|
|
}
|
|
if (error && tomoyo_memory_ok(entry)) {
|
|
INIT_LIST_HEAD(&entry->member_list);
|
|
entry->group_name = saved_group_name;
|
|
saved_group_name = NULL;
|
|
atomic_set(&entry->users, 1);
|
|
list_add_tail_rcu(&entry->list,
|
|
&tomoyo_group_list[TOMOYO_PATH_GROUP]);
|
|
group = entry;
|
|
entry = NULL;
|
|
error = 0;
|
|
}
|
|
mutex_unlock(&tomoyo_policy_lock);
|
|
out:
|
|
tomoyo_put_name(saved_group_name);
|
|
kfree(entry);
|
|
return !error ? group : NULL;
|
|
}
|
|
|
|
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_write_path_group_policy - Write "struct tomoyo_path_group" list.
|
|
*
|
|
* @data: String to parse.
|
|
* @is_delete: True if it is a delete request.
|
|
*
|
|
* Returns 0 on success, nagative value otherwise.
|
|
*/
|
|
int tomoyo_write_path_group_policy(char *data, const bool is_delete)
|
|
{
|
|
struct tomoyo_group *group;
|
|
struct tomoyo_path_group e = { };
|
|
int error = is_delete ? -ENOENT : -ENOMEM;
|
|
char *w[2];
|
|
if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
|
|
return -EINVAL;
|
|
group = tomoyo_get_path_group(w[0]);
|
|
if (!group)
|
|
return -ENOMEM;
|
|
e.member_name = tomoyo_get_name(w[1]);
|
|
if (!e.member_name)
|
|
goto out;
|
|
error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
|
|
&group->member_list,
|
|
tomoyo_same_path_group);
|
|
out:
|
|
tomoyo_put_name(e.member_name);
|
|
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 true if @pathname matches pathnames in @group, false otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
|
|
const struct tomoyo_group *group)
|
|
{
|
|
struct tomoyo_path_group *member;
|
|
bool matched = false;
|
|
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;
|
|
matched = true;
|
|
break;
|
|
}
|
|
return matched;
|
|
}
|