[nss_nonlocal.git] / nonlocal-passwd.c

/*
 * nonlocal-passwd.c
 * passwd database for nss_nonlocal proxy.
 *
 * Copyright © 2007 Anders Kaseorg <andersk@mit.edu> and Tim Abbott
 * <tabbott@mit.edu>
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */


#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"

#define MAGIC_LOCAL_PW_BUFLEN (sysconf(_SC_GETPW_R_SIZE_MAX) + 7)


static service_user *
nss_passwd_nonlocal_database(void)
{
    static service_user *nip = NULL;
    if (nip == NULL)
	__nss_database_lookup("passwd_nonlocal", NULL, "", &nip);

    return nip;
}


enum nss_status
check_nonlocal_uid(const char *user, uid_t uid, int *errnop)
{
    enum nss_status status = NSS_STATUS_SUCCESS;
    struct passwd pwbuf;
    struct passwd *pwbufp = &pwbuf;
    int ret;
    int old_errno = errno;
    int buflen = MAGIC_LOCAL_PW_BUFLEN;
    char *buf = malloc(buflen);
    if (buf == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }
    ret = getpwuid_r(uid, pwbufp, buf, buflen, &pwbufp);
    if (ret != 0) {
	*errnop = errno;
	status = NSS_STATUS_TRYAGAIN;
    } else if (pwbufp != NULL) {
	syslog(LOG_ERR, "nss_nonlocal: possible spoofing attack: non-local user %s has same UID as local user %s!\n", user, pwbuf.pw_name);
	status = NSS_STATUS_NOTFOUND;
    }
    free(buf);
    errno = old_errno;
    return status;
}

enum nss_status
check_nonlocal_user(const char *user, int *errnop)
{
    enum nss_status status = NSS_STATUS_SUCCESS;
    struct passwd pwbuf;
    struct passwd *pwbufp = &pwbuf;
    int ret;
    int old_errno = errno;
    int buflen = MAGIC_LOCAL_PW_BUFLEN;
    char *buf = malloc(buflen);
    if (buf == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }
    ret = getpwnam_r(user, pwbufp, buf, buflen, &pwbufp);
    if (ret != 0) {
	*errnop = errno;
	status = NSS_STATUS_TRYAGAIN;
    } else if (pwbufp != NULL) {
	status = NSS_STATUS_NOTFOUND;
    }
    free(buf);
    errno = old_errno;
    return status;
}


static service_user *pwent_nip = NULL;
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)
{
    static const char *fct_name = "setpwent";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(int stayopen);
	void *ptr;
    } fct;

    nip = nss_passwd_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (stayopen));
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    pwent_nip = nip;
    if (pwent_fct_start == NULL)
	pwent_fct_start = __nss_lookup_function(nip, pwent_fct_name);
    pwent_fct.ptr = pwent_fct_start;
    return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nonlocal_endpwent(void)
{
    static const char *fct_name = "endpwent";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(void);
	void *ptr;
    } fct;

    pwent_nip = NULL;

    nip = nss_passwd_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, ());
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    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 (buflen == MAGIC_LOCAL_PW_BUFLEN ||
	(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_uid(pwd->pw_name, pwd->pw_uid, &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)
{
    static const char *fct_name = "getpwnam_r";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(const char *name, struct passwd *pwd,
			     char *buffer, size_t buflen, int *errnop);
	void *ptr;
    } fct;
    int group_errno;

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

    nip = nss_passwd_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop));
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    status = check_nonlocal_uid(name, pwd->pw_uid, errnop);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    if (check_nonlocal_gid(name, 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)
{
    static const char *fct_name = "getpwuid_r";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(uid_t uid, struct passwd *pwd,
			     char *buffer, size_t buflen, int *errnop);
	void *ptr;
    } fct;
    int group_errno;

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

    nip = nss_passwd_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (uid, pwd, buffer, buflen, errnop));
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
	return status;

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

    if (check_nonlocal_gid(pwd->pw_name, 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	*
48479fc7 TA	5	* Copyright © 2007 Anders Kaseorg <andersk@mit.edu> and Tim Abbott
48479fc7 TA	6	* <tabbott@mit.edu>
f6903667 AK	7	*
	8	* Permission is hereby granted, free of charge, to any person
	9	* obtaining a copy of this software and associated documentation
	10	* files (the "Software"), to deal in the Software without
	11	* restriction, including without limitation the rights to use, copy,
	12	* modify, merge, publish, distribute, sublicense, and/or sell copies
	13	* of the Software, and to permit persons to whom the Software is
	14	* furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice shall be
	17	* included in all copies or substantial portions of the Software.
	18	*
	19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	20	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	21	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	22	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	23	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	24	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	25	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	26	* SOFTWARE.
	27	*/
	28
	29
	30	#define _GNU_SOURCE
	31	#include <sys/types.h>
	32	#include <unistd.h>
	33	#include <stdlib.h>
	34	#include <stdint.h>
	35	#include <string.h>
	36	#include <dlfcn.h>
	37	#include <stdio.h>
	38	#include <syslog.h>
	39	#include <errno.h>
	40	#include <pwd.h>
	41	#include <grp.h>
	42	#include <nss.h>
	43	#include "nsswitch-internal.h"
	44	#include "nonlocal.h"
	45
f7293a54 AK	46	#define MAGIC_LOCAL_PW_BUFLEN (sysconf(_SC_GETPW_R_SIZE_MAX) + 7)
f7293a54 AK	47
f6903667 AK	48
	49	static service_user *
	50	nss_passwd_nonlocal_database(void)
	51	{
	52	static service_user *nip = NULL;
	53	if (nip == NULL)
	54	__nss_database_lookup("passwd_nonlocal", NULL, "", &nip);
	55
	56	return nip;
	57	}
	58
	59
f6903667 AK	60	enum nss_status
	61	check_nonlocal_uid(const char user, uid_t uid, int errnop)
	62	{
f7293a54 AK	63	enum nss_status status = NSS_STATUS_SUCCESS;
	64	struct passwd pwbuf;
	65	struct passwd *pwbufp = &pwbuf;
	66	int ret;
	67	int old_errno = errno;
	68	int buflen = MAGIC_LOCAL_PW_BUFLEN;
	69	char *buf = malloc(buflen);
	70	if (buf == NULL) {
f6903667	71	*errnop = ENOMEM;
f7293a54	72	errno = old_errno;
f6903667 AK	73	return NSS_STATUS_TRYAGAIN;
f6903667 AK	74	}
f7293a54 AK	75	ret = getpwuid_r(uid, pwbufp, buf, buflen, &pwbufp);
	76	if (ret != 0) {
	77	*errnop = errno;
	78	status = NSS_STATUS_TRYAGAIN;
	79	} else if (pwbufp != NULL) {
	80	syslog(LOG_ERR, "nss_nonlocal: possible spoofing attack: non-local user %s has same UID as local user %s!\n", user, pwbuf.pw_name);
f6903667	81	status = NSS_STATUS_NOTFOUND;
f6903667	82	}
f7293a54 AK	83	free(buf);
f7293a54 AK	84	errno = old_errno;
f6903667 AK	85	return status;
	86	}
	87
48479fc7 TA	88	enum nss_status
	89	check_nonlocal_user(const char user, int errnop)
	90	{
	91	enum nss_status status = NSS_STATUS_SUCCESS;
	92	struct passwd pwbuf;
	93	struct passwd *pwbufp = &pwbuf;
	94	int ret;
	95	int old_errno = errno;
	96	int buflen = MAGIC_LOCAL_PW_BUFLEN;
	97	char *buf = malloc(buflen);
	98	if (buf == NULL) {
	99	*errnop = ENOMEM;
	100	errno = old_errno;
	101	return NSS_STATUS_TRYAGAIN;
	102	}
48479fc7 TA	103	ret = getpwnam_r(user, pwbufp, buf, buflen, &pwbufp);
	104	if (ret != 0) {
	105	*errnop = errno;
	106	status = NSS_STATUS_TRYAGAIN;
	107	} else if (pwbufp != NULL) {
	108	status = NSS_STATUS_NOTFOUND;
	109	}
	110	free(buf);
	111	errno = old_errno;
	112	return status;
	113	}
f6903667	114
1e78305d	115
f6903667 AK	116	static service_user *pwent_nip = NULL;
	117	static void *pwent_fct_start;
	118	static union {
	119	enum nss_status (l)(struct passwd pwd, char *buffer, size_t buflen,
	120	int *errnop);
	121	void *ptr;
	122	} pwent_fct;
	123	static const char *pwent_fct_name = "getpwent_r";
	124
	125	enum nss_status
	126	_nss_nonlocal_setpwent(int stayopen)
	127	{
	128	static const char *fct_name = "setpwent";
	129	static void *fct_start = NULL;
	130	enum nss_status status;
	131	service_user *nip;
	132	union {
	133	enum nss_status (*l)(int stayopen);
	134	void *ptr;
	135	} fct;
	136
	137	nip = nss_passwd_nonlocal_database();
	138	if (nip == NULL)
	139	return NSS_STATUS_UNAVAIL;
	140	if (fct_start == NULL)
	141	fct_start = __nss_lookup_function(nip, fct_name);
	142	fct.ptr = fct_start;
	143	do {
	144	if (fct.ptr == NULL)
	145	status = NSS_STATUS_UNAVAIL;
	146	else
	147	status = DL_CALL_FCT(fct.l, (stayopen));
	148	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	149	if (status != NSS_STATUS_SUCCESS)
	150	return status;
	151
	152	pwent_nip = nip;
	153	if (pwent_fct_start == NULL)
	154	pwent_fct_start = __nss_lookup_function(nip, pwent_fct_name);
	155	pwent_fct.ptr = pwent_fct_start;
	156	return NSS_STATUS_SUCCESS;
	157	}
	158
	159	enum nss_status
	160	_nss_nonlocal_endpwent(void)
	161	{
	162	static const char *fct_name = "endpwent";
	163	static void *fct_start = NULL;
	164	enum nss_status status;
	165	service_user *nip;
	166	union {
	167	enum nss_status (*l)(void);
	168	void *ptr;
	169	} fct;
	170
	171	pwent_nip = NULL;
	172
	173	nip = nss_passwd_nonlocal_database();
	174	if (nip == NULL)
	175	return NSS_STATUS_UNAVAIL;
	176	if (fct_start == NULL)
	177	fct_start = __nss_lookup_function(nip, fct_name);
	178	fct.ptr = fct_start;
	179	do {
180	if (fct.ptr == NULL)
181	status = NSS_STATUS_UNAVAIL;
182	else
183	status = DL_CALL_FCT(fct.l, ());
184	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
185	return status;
186	}
187
188	enum nss_status
189	_nss_nonlocal_getpwent_r(struct passwd pwd, char buffer, size_t buflen,
190	int *errnop)
191	{
192	enum nss_status status;
a360549e TA	193
	194	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
	195	if (buflen == MAGIC_LOCAL_PW_BUFLEN \|\|
	196	(nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
	197	return NSS_STATUS_UNAVAIL;
	198
f6903667 AK	199	if (pwent_nip == NULL) {
	200	status = _nss_nonlocal_setpwent(0);
	201	if (status != NSS_STATUS_SUCCESS)
	202	return status;
	203	}
	204	do {
	205	if (pwent_fct.ptr == NULL)
	206	status = NSS_STATUS_UNAVAIL;
	207	else {
	208	int nonlocal_errno;
	209	do
a360549e	210	status = DL_CALL_FCT(pwent_fct.l, (pwd, buffer, buflen, errnop));
f6903667 AK	211	while (status == NSS_STATUS_SUCCESS &&
	212	check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	213	}
	214	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	215	return status;
	216
	217	if (status == NSS_STATUS_SUCCESS)
	218	return NSS_STATUS_SUCCESS;
	219	} while (__nss_next(&pwent_nip, pwent_fct_name, &pwent_fct.ptr, status, 0) == 0);
	220
	221	pwent_nip = NULL;
	222	return NSS_STATUS_NOTFOUND;
	223	}
	224
	225
	226	enum nss_status
	227	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	228	char buffer, size_t buflen, int errnop)
	229	{
	230	static const char *fct_name = "getpwnam_r";
	231	static void *fct_start = NULL;
	232	enum nss_status status;
	233	service_user *nip;
	234	union {
	235	enum nss_status (l)(const char name, struct passwd *pwd,
	236	char buffer, size_t buflen, int errnop);
	237	void *ptr;
	238	} fct;
	239	int group_errno;
	240
a360549e TA	241	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
	242	if (buflen == MAGIC_LOCAL_PW_BUFLEN \|\|
	243	(nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
48479fc7 TA	244	return NSS_STATUS_UNAVAIL;
48479fc7 TA	245
f6903667 AK	246	nip = nss_passwd_nonlocal_database();
	247	if (nip == NULL)
	248	return NSS_STATUS_UNAVAIL;
	249	if (fct_start == NULL)
	250	fct_start = __nss_lookup_function(nip, fct_name);
	251	fct.ptr = fct_start;
	252	do {
	253	if (fct.ptr == NULL)
	254	status = NSS_STATUS_UNAVAIL;
	255	else
	256	status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop));
	257	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	258	break;
	259	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	260	if (status != NSS_STATUS_SUCCESS)
	261	return status;
	262
	263	status = check_nonlocal_uid(name, pwd->pw_uid, errnop);
	264	if (status != NSS_STATUS_SUCCESS)
	265	return status;
	266
	267	if (check_nonlocal_gid(name, pwd->pw_gid, &group_errno) !=
	268	NSS_STATUS_SUCCESS)
	269	pwd->pw_gid = 65534 /* nogroup */;
	270	return NSS_STATUS_SUCCESS;
	271	}
	272
	273	enum nss_status
	274	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	275	char buffer, size_t buflen, int errnop)
	276	{
	277	static const char *fct_name = "getpwuid_r";
	278	static void *fct_start = NULL;
	279	enum nss_status status;
	280	service_user *nip;
	281	union {
	282	enum nss_status (l)(uid_t uid, struct passwd pwd,
	283	char buffer, size_t buflen, int errnop);
	284	void *ptr;
	285	} fct;
	286	int group_errno;
	287
a360549e TA	288	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
	289	if (buflen == MAGIC_LOCAL_PW_BUFLEN \|\|
	290	(nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
f6903667 AK	291	return NSS_STATUS_UNAVAIL;
	292
	293	nip = nss_passwd_nonlocal_database();
	294	if (nip == NULL)
	295	return NSS_STATUS_UNAVAIL;
	296	if (fct_start == NULL)
	297	fct_start = __nss_lookup_function(nip, fct_name);
	298	fct.ptr = fct_start;
	299	do {
	300	if (fct.ptr == NULL)
	301	status = NSS_STATUS_UNAVAIL;
	302	else
	303	status = DL_CALL_FCT(fct.l, (uid, pwd, buffer, buflen, errnop));
	304	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	305	break;
	306	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	307	if (status != NSS_STATUS_SUCCESS)
	308	return status;
	309
	310	status = check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, errnop);
	311	if (status != NSS_STATUS_SUCCESS)
	312	return status;
	313
	314	if (check_nonlocal_gid(pwd->pw_name, pwd->pw_gid, &group_errno) !=
	315	NSS_STATUS_SUCCESS)
	316	pwd->pw_gid = 65534 /* nogroup */;
	317	return NSS_STATUS_SUCCESS;
	318	}