[nss_nonlocal.git] / nonlocal-passwd.c

/*
 * nonlocal-passwd.c
 * passwd database for nss_nonlocal proxy.
 *
 * Copyright © 2007–2010 Anders Kaseorg <andersk@mit.edu> and Tim
 * Abbott <tabbott@mit.edu>
 *
 * This file is part of nss_nonlocal.
 *
 * nss_nonlocal is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * nss_nonlocal 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with nss_nonlocal; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301  USA
 */


#define _GNU_SOURCE
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <dlfcn.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <nss.h>
#include "nsswitch-internal.h"
#include "nonlocal.h"


enum nss_status
_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
			 char *buffer, size_t buflen, int *errnop);
enum nss_status
_nss_nonlocal_getpwnam_r(const char *name, struct passwd *pwd,
			 char *buffer, size_t buflen, int *errnop);


static service_user *__nss_passwd_nonlocal_database;

static int
internal_function
__nss_passwd_nonlocal_lookup(service_user **ni, const char *fct_name,
			     void **fctp)
{
    if (__nss_passwd_nonlocal_database == NULL
	&& __nss_database_lookup("passwd_nonlocal", NULL, NULL,
				 &__nss_passwd_nonlocal_database) < 0)
	return -1;

    *ni = __nss_passwd_nonlocal_database;

    *fctp = __nss_lookup_function(*ni, fct_name);
    return 0;
}


enum nss_status
check_nonlocal_uid(const char *user, uid_t uid, int *errnop)
{
    enum nss_status status;
    struct passwd pwbuf;
    char *buf;
    size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
    const struct walk_nss w = {
	.lookup = &__nss_passwd_lookup, .fct_name = "getpwuid_r",
	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
    };
    const __typeof__(&_nss_nonlocal_getpwuid_r) self = &_nss_nonlocal_getpwuid_r;
#define args (uid, &pwbuf, buf, buflen, errnop)
#include "walk_nss.h"
#undef args

    if (status == NSS_STATUS_SUCCESS) {
	syslog(LOG_ERR, "nss_nonlocal: possible spoofing attack: non-local user %s has same UID as local user %s!\n", user, pwbuf.pw_name);
	free(buf);
	status = NSS_STATUS_NOTFOUND;
    } else if (status != NSS_STATUS_TRYAGAIN) {
	status = NSS_STATUS_SUCCESS;
    }

    return status;
}

enum nss_status
check_nonlocal_passwd(const char *user, struct passwd *pwd, int *errnop)
{
    enum nss_status status = NSS_STATUS_SUCCESS;
    int old_errno = errno;
    char *end;
    unsigned long uid;

    errno = 0;
    uid = strtoul(pwd->pw_name, &end, 10);
    if (errno == 0 && *end == '\0' && (uid_t)uid == uid) {
	errno = old_errno;
	status = check_nonlocal_uid(user, uid, errnop);
    } else {
	errno = old_errno;
    }
    if (status != NSS_STATUS_SUCCESS)
	return status;

    return check_nonlocal_uid(user, pwd->pw_uid, errnop);
}

enum nss_status
check_nonlocal_user(const char *user, int *errnop)
{
    enum nss_status status;
    struct passwd pwbuf;
    char *buf;
    size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
    const struct walk_nss w = {
	.lookup = __nss_passwd_lookup, .fct_name = "getpwnam_r",
	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
    };
    const __typeof__(&_nss_nonlocal_getpwnam_r) self = &_nss_nonlocal_getpwnam_r;
#define args (user, &pwbuf, buf, buflen, errnop)
#include "walk_nss.h"
#undef args

    if (status == NSS_STATUS_SUCCESS) {
	free(buf);
	status = NSS_STATUS_NOTFOUND;
    } else if (status != NSS_STATUS_TRYAGAIN) {
	status = NSS_STATUS_SUCCESS;
    }

    return status;
}

enum nss_status
get_nonlocal_passwd(const char *name, struct passwd *pwd, char **buffer,
		    int *errnop)
{
    enum nss_status status;
    size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
    const struct walk_nss w = {
	.lookup = __nss_passwd_nonlocal_lookup, .fct_name = "getpwnam_r",
	.status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
    };
    const __typeof__(&_nss_nonlocal_getpwnam_r) self = NULL;
#define args (name, pwd, *buffer, buflen, errnop)
#include "walk_nss.h"
#undef args
    return status;
}


static service_user *pwent_startp, *pwent_nip;
static void *pwent_fct_start;
static union {
    enum nss_status (*l)(struct passwd *pwd, char *buffer, size_t buflen,
			 int *errnop);
    void *ptr;
} pwent_fct;
static const char *pwent_fct_name = "getpwent_r";

enum nss_status
_nss_nonlocal_setpwent(int stayopen)
{
    enum nss_status status;
    const struct walk_nss w = {
	.lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "setpwent",
	.status = &status
    };
    const __typeof__(&_nss_nonlocal_setpwent) self = NULL;
#define args (stayopen)
#include "walk_nss.h"
#undef args
    if (status != NSS_STATUS_SUCCESS)
	return status;

    if (pwent_fct_start == NULL)
	__nss_passwd_nonlocal_lookup(&pwent_startp, pwent_fct_name,
				     &pwent_fct_start);
    pwent_nip = pwent_startp;
    pwent_fct.ptr = pwent_fct_start;
    return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nonlocal_endpwent(void)
{
    enum nss_status status;
    const struct walk_nss w = {
	.lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "endpwent",
	.status = &status
    };
    const __typeof__(&_nss_nonlocal_endpwent) self = NULL;

    pwent_nip = NULL;

#define args ()
#include "walk_nss.h"
#undef args
    return status;
}

enum nss_status
_nss_nonlocal_getpwent_r(struct passwd *pwd, char *buffer, size_t buflen,
			 int *errnop)
{
    enum nss_status status;

    char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
	return NSS_STATUS_UNAVAIL;

    if (pwent_nip == NULL) {
	status = _nss_nonlocal_setpwent(0);
	if (status != NSS_STATUS_SUCCESS)
	    return status;
    }
    do {
	if (pwent_fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else {
	    int nonlocal_errno;
	    do
		status = DL_CALL_FCT(pwent_fct.l, (pwd, buffer, buflen, errnop));
	    while (status == NSS_STATUS_SUCCESS &&
		   check_nonlocal_passwd(pwd->pw_name, pwd, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	}
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    return status;

	if (status == NSS_STATUS_SUCCESS)
	    return NSS_STATUS_SUCCESS;
    } while (__nss_next(&pwent_nip, pwent_fct_name, &pwent_fct.ptr, status, 0) == 0);

    pwent_nip = NULL;
    return NSS_STATUS_NOTFOUND;
}


enum nss_status
_nss_nonlocal_getpwnam_r(const char *name, struct passwd *pwd,
			 char *buffer, size_t buflen, int *errnop)
{
    enum nss_status status;
    int group_errno;
    const struct walk_nss w = {
	.lookup = __nss_passwd_nonlocal_lookup, .fct_name = "getpwnam_r",
	.status = &status, .errnop = errnop
    };
    const __typeof__(&_nss_nonlocal_getpwnam_r) self = NULL;

    char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
	return NSS_STATUS_UNAVAIL;

#define args (name, pwd, buffer, buflen, errnop)
#include "walk_nss.h"
#undef args
    if (status != NSS_STATUS_SUCCESS)
	return status;

    if (strcmp(name, pwd->pw_name) != 0) {
	syslog(LOG_ERR, "nss_nonlocal: discarding user %s from lookup for user %s\n", pwd->pw_name, name);
	return NSS_STATUS_NOTFOUND;
    }

    status = check_nonlocal_passwd(name, pwd, errnop);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    if (check_nonlocal_gid(name, NULL, pwd->pw_gid, &group_errno) !=
	NSS_STATUS_SUCCESS)
	pwd->pw_gid = 65534 /* nogroup */;
    return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
			 char *buffer, size_t buflen, int *errnop)
{
    enum nss_status status;
    int group_errno;
    const struct walk_nss w = {
	.lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "getpwuid_r",
	.status = &status, .errnop = errnop
    };
    const __typeof__(&_nss_nonlocal_getpwuid_r) self = NULL;

    char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
	return NSS_STATUS_UNAVAIL;

#define args (uid, pwd, buffer, buflen, errnop)
#include "walk_nss.h"
#undef args
    if (status != NSS_STATUS_SUCCESS)
	return status;

    if (uid != pwd->pw_uid) {
	syslog(LOG_ERR, "nss_nonlocal: discarding uid %d from lookup for uid %d\n", pwd->pw_uid, uid);
	return NSS_STATUS_NOTFOUND;
    }

    status = check_nonlocal_passwd(pwd->pw_name, pwd, errnop);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    if (check_nonlocal_gid(pwd->pw_name, NULL, pwd->pw_gid, &group_errno) !=
	NSS_STATUS_SUCCESS)
	pwd->pw_gid = 65534 /* nogroup */;
    return NSS_STATUS_SUCCESS;
}
Commit	Line	Data
f6903667 AK	1	/*
	2	* nonlocal-passwd.c
	3	* passwd database for nss_nonlocal proxy.
	4	*
96a1ee0f AK	5	* Copyright © 2007–2010 Anders Kaseorg <andersk@mit.edu> and Tim
96a1ee0f AK	6	* Abbott <tabbott@mit.edu>
f6903667	7	*
96a1ee0f	8	* This file is part of nss_nonlocal.
f6903667	9	*
96a1ee0f AK	10	* nss_nonlocal is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU Lesser General Public License
	12	* as published by the Free Software Foundation; either version 2.1 of
	13	* the License, or (at your option) any later version.
f6903667	14	*
96a1ee0f AK	15	* nss_nonlocal is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* Lesser General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU Lesser General Public
	21	* License along with nss_nonlocal; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	23	* 02110-1301 USA
f6903667 AK	24	*/
	25
	26
	27	#define _GNU_SOURCE
	28	#include <sys/types.h>
	29	#include <unistd.h>
	30	#include <stdlib.h>
	31	#include <stdint.h>
	32	#include <string.h>
	33	#include <dlfcn.h>
	34	#include <stdio.h>
	35	#include <syslog.h>
	36	#include <errno.h>
	37	#include <pwd.h>
	38	#include <grp.h>
	39	#include <nss.h>
	40	#include "nsswitch-internal.h"
	41	#include "nonlocal.h"
	42
c1812233 AK	43
	44	enum nss_status
	45	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	46	char buffer, size_t buflen, int errnop);
	47	enum nss_status
	48	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	49	char buffer, size_t buflen, int errnop);
f7293a54	50
f6903667	51
cbb0e3ea AK	52	static service_user *__nss_passwd_nonlocal_database;
	53
	54	static int
	55	internal_function
	56	__nss_passwd_nonlocal_lookup(service_user *ni, const char fct_name,
	57	void **fctp)
f6903667	58	{
cbb0e3ea AK	59	if (__nss_passwd_nonlocal_database == NULL
	60	&& __nss_database_lookup("passwd_nonlocal", NULL, NULL,
	61	&__nss_passwd_nonlocal_database) < 0)
	62	return -1;
	63
	64	*ni = __nss_passwd_nonlocal_database;
f6903667	65
cbb0e3ea AK	66	fctp = __nss_lookup_function(ni, fct_name);
cbb0e3ea AK	67	return 0;
f6903667 AK	68	}
	69
	70
f6903667 AK	71	enum nss_status
	72	check_nonlocal_uid(const char user, uid_t uid, int errnop)
	73	{
30fb3957	74	enum nss_status status;
f7293a54	75	struct passwd pwbuf;
cbb0e3ea	76	char *buf;
8870ee9c	77	size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
cbb0e3ea AK	78	const struct walk_nss w = {
	79	.lookup = &__nss_passwd_lookup, .fct_name = "getpwuid_r",
	80	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
	81	};
	82	const __typeof__(&_nss_nonlocal_getpwuid_r) self = &_nss_nonlocal_getpwuid_r;
	83	#define args (uid, &pwbuf, buf, buflen, errnop)
	84	#include "walk_nss.h"
	85	#undef args
30fb3957 AK	86
30fb3957 AK	87	if (status == NSS_STATUS_SUCCESS) {
f7293a54	88	syslog(LOG_ERR, "nss_nonlocal: possible spoofing attack: non-local user %s has same UID as local user %s!\n", user, pwbuf.pw_name);
cbb0e3ea	89	free(buf);
f6903667	90	status = NSS_STATUS_NOTFOUND;
30fb3957 AK	91	} else if (status != NSS_STATUS_TRYAGAIN) {
30fb3957 AK	92	status = NSS_STATUS_SUCCESS;
f6903667	93	}
30fb3957	94
f6903667 AK	95	return status;
	96	}
	97
cf338316 AK	98	enum nss_status
	99	check_nonlocal_passwd(const char user, struct passwd pwd, int *errnop)
	100	{
a07a7616 AK	101	enum nss_status status = NSS_STATUS_SUCCESS;
	102	int old_errno = errno;
	103	char *end;
	104	unsigned long uid;
	105
	106	errno = 0;
	107	uid = strtoul(pwd->pw_name, &end, 10);
f4061d47 AK	108	if (errno == 0 && *end == '\0' && (uid_t)uid == uid) {
f4061d47 AK	109	errno = old_errno;
a07a7616	110	status = check_nonlocal_uid(user, uid, errnop);
f4061d47 AK	111	} else {
	112	errno = old_errno;
	113	}
a07a7616 AK	114	if (status != NSS_STATUS_SUCCESS)
	115	return status;
	116
cf338316 AK	117	return check_nonlocal_uid(user, pwd->pw_uid, errnop);
	118	}
	119
48479fc7 TA	120	enum nss_status
	121	check_nonlocal_user(const char user, int errnop)
	122	{
30fb3957	123	enum nss_status status;
48479fc7	124	struct passwd pwbuf;
cbb0e3ea	125	char *buf;
8870ee9c	126	size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
cbb0e3ea AK	127	const struct walk_nss w = {
	128	.lookup = __nss_passwd_lookup, .fct_name = "getpwnam_r",
	129	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
	130	};
	131	const __typeof__(&_nss_nonlocal_getpwnam_r) self = &_nss_nonlocal_getpwnam_r;
	132	#define args (user, &pwbuf, buf, buflen, errnop)
	133	#include "walk_nss.h"
	134	#undef args
30fb3957	135
cbb0e3ea	136	if (status == NSS_STATUS_SUCCESS) {
30fb3957	137	free(buf);
30fb3957	138	status = NSS_STATUS_NOTFOUND;
cbb0e3ea	139	} else if (status != NSS_STATUS_TRYAGAIN) {
30fb3957	140	status = NSS_STATUS_SUCCESS;
cbb0e3ea	141	}
30fb3957	142
48479fc7 TA	143	return status;
48479fc7 TA	144	}
f6903667	145
775f7dc3 AK	146	enum nss_status
	147	get_nonlocal_passwd(const char name, struct passwd pwd, char **buffer,
	148	int *errnop)
	149	{
	150	enum nss_status status;
	151	size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
	152	const struct walk_nss w = {
	153	.lookup = __nss_passwd_nonlocal_lookup, .fct_name = "getpwnam_r",
	154	.status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
	155	};
	156	const __typeof__(&_nss_nonlocal_getpwnam_r) self = NULL;
	157	#define args (name, pwd, *buffer, buflen, errnop)
	158	#include "walk_nss.h"
	159	#undef args
	160	return status;
	161	}
	162
1e78305d	163
cbb0e3ea	164	static service_user pwent_startp, pwent_nip;
f6903667 AK	165	static void *pwent_fct_start;
	166	static union {
	167	enum nss_status (l)(struct passwd pwd, char *buffer, size_t buflen,
	168	int *errnop);
	169	void *ptr;
	170	} pwent_fct;
	171	static const char *pwent_fct_name = "getpwent_r";
	172
	173	enum nss_status
	174	_nss_nonlocal_setpwent(int stayopen)
	175	{
f6903667	176	enum nss_status status;
cbb0e3ea AK	177	const struct walk_nss w = {
	178	.lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "setpwent",
	179	.status = &status
	180	};
	181	const __typeof__(&_nss_nonlocal_setpwent) self = NULL;
	182	#define args (stayopen)
	183	#include "walk_nss.h"
	184	#undef args
f6903667 AK	185	if (status != NSS_STATUS_SUCCESS)
	186	return status;
	187
f6903667	188	if (pwent_fct_start == NULL)
cbb0e3ea AK	189	__nss_passwd_nonlocal_lookup(&pwent_startp, pwent_fct_name,
	190	&pwent_fct_start);
	191	pwent_nip = pwent_startp;
f6903667 AK	192	pwent_fct.ptr = pwent_fct_start;
	193	return NSS_STATUS_SUCCESS;
	194	}
	195
	196	enum nss_status
	197	_nss_nonlocal_endpwent(void)
	198	{
f6903667	199	enum nss_status status;
cbb0e3ea AK	200	const struct walk_nss w = {
	201	.lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "endpwent",
	202	.status = &status
	203	};
	204	const __typeof__(&_nss_nonlocal_endpwent) self = NULL;
f6903667 AK	205
	206	pwent_nip = NULL;
	207
cbb0e3ea AK	208	#define args ()
	209	#include "walk_nss.h"
	210	#undef args
f6903667 AK	211	return status;
	212	}
	213
	214	enum nss_status
	215	_nss_nonlocal_getpwent_r(struct passwd pwd, char buffer, size_t buflen,
	216	int *errnop)
	217	{
	218	enum nss_status status;
a360549e TA	219
a360549e TA	220	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	221	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
a360549e TA	222	return NSS_STATUS_UNAVAIL;
a360549e TA	223
f6903667 AK	224	if (pwent_nip == NULL) {
	225	status = _nss_nonlocal_setpwent(0);
	226	if (status != NSS_STATUS_SUCCESS)
	227	return status;
	228	}
	229	do {
	230	if (pwent_fct.ptr == NULL)
	231	status = NSS_STATUS_UNAVAIL;
	232	else {
	233	int nonlocal_errno;
	234	do
a360549e	235	status = DL_CALL_FCT(pwent_fct.l, (pwd, buffer, buflen, errnop));
f6903667	236	while (status == NSS_STATUS_SUCCESS &&
cf338316	237	check_nonlocal_passwd(pwd->pw_name, pwd, &nonlocal_errno) != NSS_STATUS_SUCCESS);
f6903667 AK	238	}
	239	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	240	return status;
	241
	242	if (status == NSS_STATUS_SUCCESS)
	243	return NSS_STATUS_SUCCESS;
	244	} while (__nss_next(&pwent_nip, pwent_fct_name, &pwent_fct.ptr, status, 0) == 0);
	245
	246	pwent_nip = NULL;
	247	return NSS_STATUS_NOTFOUND;
	248	}
	249
	250
	251	enum nss_status
	252	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	253	char buffer, size_t buflen, int errnop)
	254	{
f6903667	255	enum nss_status status;
f6903667	256	int group_errno;
cbb0e3ea AK	257	const struct walk_nss w = {
	258	.lookup = __nss_passwd_nonlocal_lookup, .fct_name = "getpwnam_r",
	259	.status = &status, .errnop = errnop
	260	};
	261	const __typeof__(&_nss_nonlocal_getpwnam_r) self = NULL;
f6903667	262
a360549e	263	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	264	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
48479fc7 TA	265	return NSS_STATUS_UNAVAIL;
48479fc7 TA	266
cbb0e3ea AK	267	#define args (name, pwd, buffer, buflen, errnop)
	268	#include "walk_nss.h"
	269	#undef args
f6903667 AK	270	if (status != NSS_STATUS_SUCCESS)
	271	return status;
	272
22562df0 AK	273	if (strcmp(name, pwd->pw_name) != 0) {
	274	syslog(LOG_ERR, "nss_nonlocal: discarding user %s from lookup for user %s\n", pwd->pw_name, name);
	275	return NSS_STATUS_NOTFOUND;
	276	}
	277
cf338316	278	status = check_nonlocal_passwd(name, pwd, errnop);
f6903667 AK	279	if (status != NSS_STATUS_SUCCESS)
	280	return status;
	281
25468b96	282	if (check_nonlocal_gid(name, NULL, pwd->pw_gid, &group_errno) !=
f6903667 AK	283	NSS_STATUS_SUCCESS)
	284	pwd->pw_gid = 65534 /* nogroup */;
	285	return NSS_STATUS_SUCCESS;
	286	}
	287
	288	enum nss_status
	289	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	290	char buffer, size_t buflen, int errnop)
	291	{
f6903667	292	enum nss_status status;
f6903667	293	int group_errno;
cbb0e3ea AK	294	const struct walk_nss w = {
	295	.lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "getpwuid_r",
	296	.status = &status, .errnop = errnop
	297	};
	298	const __typeof__(&_nss_nonlocal_getpwuid_r) self = NULL;
f6903667	299
a360549e	300	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	301	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
f6903667 AK	302	return NSS_STATUS_UNAVAIL;
f6903667 AK	303
cbb0e3ea AK	304	#define args (uid, pwd, buffer, buflen, errnop)
	305	#include "walk_nss.h"
	306	#undef args
f6903667 AK	307	if (status != NSS_STATUS_SUCCESS)
	308	return status;
	309
8027fdc4 AK	310	if (uid != pwd->pw_uid) {
	311	syslog(LOG_ERR, "nss_nonlocal: discarding uid %d from lookup for uid %d\n", pwd->pw_uid, uid);
	312	return NSS_STATUS_NOTFOUND;
	313	}
	314
cf338316	315	status = check_nonlocal_passwd(pwd->pw_name, pwd, errnop);
f6903667 AK	316	if (status != NSS_STATUS_SUCCESS)
	317	return status;
	318
25468b96	319	if (check_nonlocal_gid(pwd->pw_name, NULL, pwd->pw_gid, &group_errno) !=
f6903667 AK	320	NSS_STATUS_SUCCESS)
	321	pwd->pw_gid = 65534 /* nogroup */;
	322	return NSS_STATUS_SUCCESS;
	323	}