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/*
Copyright (C) Andrew Tridgell 2009
Copyright (c) 2011 Andreas Schneider <asn@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef _SAMBA_BUILD_
#define UID_WRAPPER_NOT_REPLACE
#include "replace.h"
#include "system/passwd.h"
#include <talloc.h>
#else /* _SAMBA_BUILD_ */
#error uid_wrapper_only_supported_in_samba_yet
#endif
#ifndef _PUBLIC_
#define _PUBLIC_
#endif
/*
we keep the virtualised euid/egid/groups information here
*/
static struct {
bool initialised;
bool enabled;
uid_t myuid;
uid_t euid;
uid_t mygid;
gid_t egid;
gid_t *groups;
} uwrap;
static void uwrap_init(void)
{
if (uwrap.initialised) return;
uwrap.initialised = true;
if (getenv("UID_WRAPPER")) {
uwrap.enabled = true;
/* put us in one group */
uwrap.myuid = uwrap.euid = geteuid();
uwrap.mygid = uwrap.egid = getegid();
uwrap.groups = talloc_array(NULL, gid_t, 1);
uwrap.groups[0] = 0;
}
}
#undef uwrap_enabled
_PUBLIC_ int uwrap_enabled(void)
{
uwrap_init();
return uwrap.enabled?1:0;
}
#ifdef HAVE_SETEUID
_PUBLIC_ int uwrap_seteuid(uid_t euid)
{
uwrap_init();
if (!uwrap.enabled) {
return seteuid(euid);
}
/* assume for now that the ruid stays as root */
if (euid == 0) {
uwrap.euid = uwrap.myuid;
} else {
uwrap.euid = euid;
}
return 0;
}
#endif
#ifdef HAVE_SETREUID
_PUBLIC_ int uwrap_setreuid(uid_t ruid, uid_t euid)
{
uwrap_init();
if (!uwrap.enabled) {
return setreuid(ruid, euid);
}
/* assume for now that the ruid stays as root */
if (euid == 0) {
uwrap.euid = uwrap.myuid;
} else {
uwrap.euid = euid;
}
return 0;
}
#endif
#ifdef HAVE_SETRESUID
_PUBLIC_ int uwrap_setresuid(uid_t ruid, uid_t euid, uid_t suid)
{
uwrap_init();
if (!uwrap.enabled) {
return setresuid(ruid, euid, suid);
}
/* assume for now that the ruid stays as root */
if (euid == 0) {
uwrap.euid = uwrap.myuid;
} else {
uwrap.euid = euid;
}
return 0;
}
#endif
_PUBLIC_ uid_t uwrap_geteuid(void)
{
uwrap_init();
if (!uwrap.enabled) {
return geteuid();
}
return uwrap.euid;
}
#ifdef HAVE_SETEGID
_PUBLIC_ int uwrap_setegid(gid_t egid)
{
uwrap_init();
if (!uwrap.enabled) {
return setegid(egid);
}
/* assume for now that the ruid stays as root */
if (egid == 0) {
uwrap.egid = uwrap.mygid;
} else {
uwrap.egid = egid;
}
return 0;
}
#endif
#ifdef HAVE_SETREGID
_PUBLIC_ int uwrap_setregid(gid_t rgid, gid_t egid)
{
uwrap_init();
if (!uwrap.enabled) {
return setregid(rgid, egid);
}
/* assume for now that the ruid stays as root */
if (egid == 0) {
uwrap.egid = uwrap.mygid;
} else {
uwrap.egid = egid;
}
return 0;
}
#endif
#ifdef HAVE_SETRESGID
_PUBLIC_ int uwrap_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
{
uwrap_init();
if (!uwrap.enabled) {
return setresgid(rgid, egid, sgid);
}
/* assume for now that the ruid stays as root */
if (egid == 0) {
uwrap.egid = uwrap.mygid;
} else {
uwrap.egid = egid;
}
return 0;
}
#endif
_PUBLIC_ uid_t uwrap_getegid(void)
{
uwrap_init();
if (!uwrap.enabled) {
return getegid();
}
return uwrap.egid;
}
_PUBLIC_ int uwrap_setgroups(size_t size, const gid_t *list)
{
uwrap_init();
if (!uwrap.enabled) {
return setgroups(size, list);
}
talloc_free(uwrap.groups);
uwrap.groups = NULL;
if (size != 0) {
uwrap.groups = talloc_array(NULL, gid_t, size);
if (uwrap.groups == NULL) {
errno = ENOMEM;
return -1;
}
memcpy(uwrap.groups, list, size*sizeof(gid_t));
}
return 0;
}
_PUBLIC_ int uwrap_getgroups(int size, gid_t *list)
{
size_t ngroups;
uwrap_init();
if (!uwrap.enabled) {
return getgroups(size, list);
}
ngroups = talloc_array_length(uwrap.groups);
if (size > ngroups) {
size = ngroups;
}
if (size == 0) {
return ngroups;
}
if (size < ngroups) {
errno = EINVAL;
return -1;
}
memcpy(list, uwrap.groups, size*sizeof(gid_t));
return ngroups;
}
_PUBLIC_ uid_t uwrap_getuid(void)
{
uwrap_init();
if (!uwrap.enabled) {
return getuid();
}
/* we don't simulate ruid changing */
return 0;
}
_PUBLIC_ gid_t uwrap_getgid(void)
{
uwrap_init();
if (!uwrap.enabled) {
return getgid();
}
/* we don't simulate rgid changing */
return 0;
}
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