shadow/libsubid/api.c

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/*
* Copyright (c) 2020 Serge Hallyn
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <pwd.h>
#include <stdbool.h>
#include "subordinateio.h"
#include "idmapping.h"
#include "api.h"
static struct subordinate_range **get_subid_ranges(const char *owner, enum subid_type id_type)
{
struct subordinate_range **ranges = NULL;
switch (id_type) {
case ID_TYPE_UID:
if (!sub_uid_open(O_RDONLY)) {
return NULL;
}
break;
case ID_TYPE_GID:
if (!sub_gid_open(O_RDONLY)) {
return NULL;
}
break;
default:
return NULL;
}
ranges = list_owner_ranges(owner, id_type);
if (id_type == ID_TYPE_UID)
sub_uid_close();
else
sub_gid_close();
return ranges;
}
struct subordinate_range **get_subuid_ranges(const char *owner)
{
return get_subid_ranges(owner, ID_TYPE_UID);
}
struct subordinate_range **get_subgid_ranges(const char *owner)
{
return get_subid_ranges(owner, ID_TYPE_GID);
}
void subid_free_ranges(struct subordinate_range **ranges)
{
return free_subordinate_ranges(ranges);
}
int get_subid_owner(unsigned long id, uid_t **owner, enum subid_type id_type)
{
int ret = -1;
switch (id_type) {
case ID_TYPE_UID:
if (!sub_uid_open(O_RDONLY)) {
return -1;
}
break;
case ID_TYPE_GID:
if (!sub_gid_open(O_RDONLY)) {
return -1;
}
break;
default:
return -1;
}
ret = find_subid_owners(id, owner, id_type);
if (id_type == ID_TYPE_UID)
sub_uid_close();
else
sub_gid_close();
return ret;
}
int get_subuid_owners(uid_t uid, uid_t **owner)
{
return get_subid_owner((unsigned long)uid, owner, ID_TYPE_UID);
}
int get_subgid_owners(gid_t gid, uid_t **owner)
{
return get_subid_owner((unsigned long)gid, owner, ID_TYPE_GID);
}
bool grant_subid_range(struct subordinate_range *range, bool reuse,
enum subid_type id_type)
{
bool ret;
switch (id_type) {
case ID_TYPE_UID:
if (!sub_uid_lock()) {
printf("Failed loging subuids (errno %d)\n", errno);
return false;
}
if (!sub_uid_open(O_CREAT | O_RDWR)) {
printf("Failed opening subuids (errno %d)\n", errno);
sub_uid_unlock();
return false;
}
break;
case ID_TYPE_GID:
if (!sub_gid_lock()) {
printf("Failed loging subgids (errno %d)\n", errno);
return false;
}
if (!sub_gid_open(O_CREAT | O_RDWR)) {
printf("Failed opening subgids (errno %d)\n", errno);
sub_gid_unlock();
return false;
}
break;
default:
return false;
}
ret = new_subid_range(range, id_type, reuse);
if (id_type == ID_TYPE_UID) {
sub_uid_close();
sub_uid_unlock();
} else {
sub_gid_close();
sub_gid_unlock();
}
return ret;
}
bool grant_subuid_range(struct subordinate_range *range, bool reuse)
{
return grant_subid_range(range, reuse, ID_TYPE_UID);
}
bool grant_subgid_range(struct subordinate_range *range, bool reuse)
{
return grant_subid_range(range, reuse, ID_TYPE_GID);
}
bool free_subid_range(struct subordinate_range *range, enum subid_type id_type)
{
bool ret;
switch (id_type) {
case ID_TYPE_UID:
if (!sub_uid_lock()) {
printf("Failed loging subuids (errno %d)\n", errno);
return false;
}
if (!sub_uid_open(O_CREAT | O_RDWR)) {
printf("Failed opening subuids (errno %d)\n", errno);
sub_uid_unlock();
return false;
}
break;
case ID_TYPE_GID:
if (!sub_gid_lock()) {
printf("Failed loging subgids (errno %d)\n", errno);
return false;
}
if (!sub_gid_open(O_CREAT | O_RDWR)) {
printf("Failed opening subgids (errno %d)\n", errno);
sub_gid_unlock();
return false;
}
break;
default:
return false;
}
ret = release_subid_range(range, id_type);
if (id_type == ID_TYPE_UID) {
sub_uid_close();
sub_uid_unlock();
} else {
sub_gid_close();
sub_gid_unlock();
}
return ret;
}
bool free_subuid_range(struct subordinate_range *range)
{
return free_subid_range(range, ID_TYPE_UID);
}
bool free_subgid_range(struct subordinate_range *range)
{
return free_subid_range(range, ID_TYPE_GID);
}