[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;
    }
    errno = 0;
    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;
    }
    errno = 0;
    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	errno = 0;
	76	ret = getpwuid_r(uid, pwbufp, buf, buflen, &pwbufp);
	77	if (ret != 0) {
	78	*errnop = errno;
	79	status = NSS_STATUS_TRYAGAIN;
	80	} else if (pwbufp != NULL) {
	81	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	82	status = NSS_STATUS_NOTFOUND;
f6903667	83	}
f7293a54 AK	84	free(buf);
f7293a54 AK	85	errno = old_errno;
f6903667 AK	86	return status;
	87	}
	88
48479fc7 TA	89	enum nss_status
	90	check_nonlocal_user(const char user, int errnop)
	91	{
	92	enum nss_status status = NSS_STATUS_SUCCESS;
	93	struct passwd pwbuf;
	94	struct passwd *pwbufp = &pwbuf;
	95	int ret;
	96	int old_errno = errno;
	97	int buflen = MAGIC_LOCAL_PW_BUFLEN;
	98	char *buf = malloc(buflen);
	99	if (buf == NULL) {
	100	*errnop = ENOMEM;
	101	errno = old_errno;
	102	return NSS_STATUS_TRYAGAIN;
	103	}
	104	errno = 0;
	105	ret = getpwnam_r(user, pwbufp, buf, buflen, &pwbufp);
	106	if (ret != 0) {
	107	*errnop = errno;
	108	status = NSS_STATUS_TRYAGAIN;
	109	} else if (pwbufp != NULL) {
	110	status = NSS_STATUS_NOTFOUND;
	111	}
	112	free(buf);
	113	errno = old_errno;
	114	return status;
	115	}
f6903667	116
1e78305d	117
f6903667 AK	118	static service_user *pwent_nip = NULL;
	119	static void *pwent_fct_start;
	120	static union {
	121	enum nss_status (l)(struct passwd pwd, char *buffer, size_t buflen,
	122	int *errnop);
	123	void *ptr;
	124	} pwent_fct;
	125	static const char *pwent_fct_name = "getpwent_r";
	126
	127	enum nss_status
	128	_nss_nonlocal_setpwent(int stayopen)
	129	{
	130	static const char *fct_name = "setpwent";
	131	static void *fct_start = NULL;
	132	enum nss_status status;
	133	service_user *nip;
	134	union {
	135	enum nss_status (*l)(int stayopen);
	136	void *ptr;
	137	} fct;
	138
	139	nip = nss_passwd_nonlocal_database();
	140	if (nip == NULL)
	141	return NSS_STATUS_UNAVAIL;
	142	if (fct_start == NULL)
	143	fct_start = __nss_lookup_function(nip, fct_name);
	144	fct.ptr = fct_start;
	145	do {
	146	if (fct.ptr == NULL)
	147	status = NSS_STATUS_UNAVAIL;
	148	else
	149	status = DL_CALL_FCT(fct.l, (stayopen));
	150	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	151	if (status != NSS_STATUS_SUCCESS)
	152	return status;
	153
	154	pwent_nip = nip;
	155	if (pwent_fct_start == NULL)
	156	pwent_fct_start = __nss_lookup_function(nip, pwent_fct_name);
	157	pwent_fct.ptr = pwent_fct_start;
	158	return NSS_STATUS_SUCCESS;
	159	}
	160
	161	enum nss_status
	162	_nss_nonlocal_endpwent(void)
	163	{
	164	static const char *fct_name = "endpwent";
	165	static void *fct_start = NULL;
	166	enum nss_status status;
	167	service_user *nip;
	168	union {
	169	enum nss_status (*l)(void);
	170	void *ptr;
	171	} fct;
	172
	173	pwent_nip = NULL;
	174
	175	nip = nss_passwd_nonlocal_database();
	176	if (nip == NULL)
	177	return NSS_STATUS_UNAVAIL;
	178	if (fct_start == NULL)
	179	fct_start = __nss_lookup_function(nip, fct_name);
	180	fct.ptr = fct_start;
	181	do {
182	if (fct.ptr == NULL)
183	status = NSS_STATUS_UNAVAIL;
184	else
185	status = DL_CALL_FCT(fct.l, ());
186	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
187	return status;
188	}
189
190	enum nss_status
191	_nss_nonlocal_getpwent_r(struct passwd pwd, char buffer, size_t buflen,
192	int *errnop)
193	{
194	enum nss_status status;
a360549e TA	195
	196	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
	197	if (buflen == MAGIC_LOCAL_PW_BUFLEN \|\|
	198	(nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
	199	return NSS_STATUS_UNAVAIL;
	200
f6903667 AK	201	if (pwent_nip == NULL) {
	202	status = _nss_nonlocal_setpwent(0);
	203	if (status != NSS_STATUS_SUCCESS)
	204	return status;
	205	}
	206	do {
	207	if (pwent_fct.ptr == NULL)
	208	status = NSS_STATUS_UNAVAIL;
	209	else {
	210	int nonlocal_errno;
	211	do
a360549e	212	status = DL_CALL_FCT(pwent_fct.l, (pwd, buffer, buflen, errnop));
f6903667 AK	213	while (status == NSS_STATUS_SUCCESS &&
	214	check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	215	}
	216	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	217	return status;
	218
	219	if (status == NSS_STATUS_SUCCESS)
	220	return NSS_STATUS_SUCCESS;
	221	} while (__nss_next(&pwent_nip, pwent_fct_name, &pwent_fct.ptr, status, 0) == 0);
	222
	223	pwent_nip = NULL;
	224	return NSS_STATUS_NOTFOUND;
	225	}
	226
	227
	228	enum nss_status
	229	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	230	char buffer, size_t buflen, int errnop)
	231	{
	232	static const char *fct_name = "getpwnam_r";
	233	static void *fct_start = NULL;
	234	enum nss_status status;
	235	service_user *nip;
	236	union {
	237	enum nss_status (l)(const char name, struct passwd *pwd,
	238	char buffer, size_t buflen, int errnop);
	239	void *ptr;
	240	} fct;
	241	int group_errno;
	242
a360549e TA	243	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
	244	if (buflen == MAGIC_LOCAL_PW_BUFLEN \|\|
	245	(nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
48479fc7 TA	246	return NSS_STATUS_UNAVAIL;
48479fc7 TA	247
f6903667 AK	248	nip = nss_passwd_nonlocal_database();
	249	if (nip == NULL)
	250	return NSS_STATUS_UNAVAIL;
	251	if (fct_start == NULL)
	252	fct_start = __nss_lookup_function(nip, fct_name);
	253	fct.ptr = fct_start;
	254	do {
	255	if (fct.ptr == NULL)
	256	status = NSS_STATUS_UNAVAIL;
	257	else
	258	status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop));
	259	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	260	break;
	261	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	262	if (status != NSS_STATUS_SUCCESS)
	263	return status;
	264
	265	status = check_nonlocal_uid(name, pwd->pw_uid, errnop);
	266	if (status != NSS_STATUS_SUCCESS)
	267	return status;
	268
	269	if (check_nonlocal_gid(name, pwd->pw_gid, &group_errno) !=
	270	NSS_STATUS_SUCCESS)
	271	pwd->pw_gid = 65534 /* nogroup */;
	272	return NSS_STATUS_SUCCESS;
	273	}
	274
	275	enum nss_status
	276	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	277	char buffer, size_t buflen, int errnop)
	278	{
	279	static const char *fct_name = "getpwuid_r";
	280	static void *fct_start = NULL;
	281	enum nss_status status;
	282	service_user *nip;
	283	union {
	284	enum nss_status (l)(uid_t uid, struct passwd pwd,
	285	char buffer, size_t buflen, int errnop);
	286	void *ptr;
	287	} fct;
	288	int group_errno;
	289
a360549e TA	290	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
	291	if (buflen == MAGIC_LOCAL_PW_BUFLEN \|\|
	292	(nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0'))
f6903667 AK	293	return NSS_STATUS_UNAVAIL;
	294
	295	nip = nss_passwd_nonlocal_database();
	296	if (nip == NULL)
	297	return NSS_STATUS_UNAVAIL;
	298	if (fct_start == NULL)
	299	fct_start = __nss_lookup_function(nip, fct_name);
	300	fct.ptr = fct_start;
	301	do {
	302	if (fct.ptr == NULL)
	303	status = NSS_STATUS_UNAVAIL;
	304	else
	305	status = DL_CALL_FCT(fct.l, (uid, pwd, buffer, buflen, errnop));
	306	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	307	break;
	308	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	309	if (status != NSS_STATUS_SUCCESS)
	310	return status;
	311
	312	status = check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, errnop);
	313	if (status != NSS_STATUS_SUCCESS)
	314	return status;
	315
	316	if (check_nonlocal_gid(pwd->pw_name, pwd->pw_gid, &group_errno) !=
	317	NSS_STATUS_SUCCESS)
	318	pwd->pw_gid = 65534 /* nogroup */;
	319	return NSS_STATUS_SUCCESS;
	320	}