[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"


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(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)
{
    static const char *fct_name = "getpwuid_r";
    static service_user *startp = NULL;
    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;
    struct passwd pwbuf;
    int old_errno = errno;

    int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
    char *buf = malloc(buflen);
    if (buf == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }

    if (fct_start == NULL &&
	__nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
	free(buf);
	return NSS_STATUS_UNAVAIL;
    }
    nip = startp;
    fct.ptr = fct_start;
    do {
	if (fct.l == _nss_nonlocal_getpwuid_r)
	    status = NSS_STATUS_NOTFOUND;
	else
	    status = DL_CALL_FCT(fct.l, (uid, &pwbuf, buf, 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) {
	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;
    } else if (status != NSS_STATUS_TRYAGAIN) {
	status = NSS_STATUS_SUCCESS;
    }

    free(buf);
    return status;
}

enum nss_status
check_nonlocal_user(const char *user, int *errnop)
{
    static const char *fct_name = "getpwnam_r";
    static service_user *startp = NULL;
    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;
    struct passwd pwbuf;
    int old_errno = errno;

    int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
    char *buf = malloc(buflen);
    if (buf == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }

    if (fct_start == NULL &&
	__nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
	free(buf);
	return NSS_STATUS_UNAVAIL;
    }
    nip = startp;
    fct.ptr = fct_start;
    do {
	if (fct.l == _nss_nonlocal_getpwnam_r)
	    status = NSS_STATUS_NOTFOUND;
	else
	    status = DL_CALL_FCT(fct.l, (user, &pwbuf, buf, 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)
	status = NSS_STATUS_NOTFOUND;
    else if (status != NSS_STATUS_TRYAGAIN)
	status = NSS_STATUS_SUCCESS;

    free(buf);
    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 (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 (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 (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
c1812233 AK	46
	47	enum nss_status
	48	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	49	char buffer, size_t buflen, int errnop);
	50	enum nss_status
	51	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	52	char buffer, size_t buflen, int errnop);
f7293a54	53
f6903667 AK	54
	55	static service_user *
	56	nss_passwd_nonlocal_database(void)
	57	{
	58	static service_user *nip = NULL;
	59	if (nip == NULL)
	60	__nss_database_lookup("passwd_nonlocal", NULL, "", &nip);
	61
	62	return nip;
	63	}
	64
	65
f6903667 AK	66	enum nss_status
	67	check_nonlocal_uid(const char user, uid_t uid, int errnop)
	68	{
30fb3957 AK	69	static const char *fct_name = "getpwuid_r";
	70	static service_user *startp = NULL;
	71	static void *fct_start = NULL;
	72	enum nss_status status;
	73	service_user *nip;
	74	union {
	75	enum nss_status (l)(uid_t uid, struct passwd pwd,
	76	char buffer, size_t buflen, int errnop);
	77	void *ptr;
	78	} fct;
f7293a54	79	struct passwd pwbuf;
f7293a54	80	int old_errno = errno;
c1812233 AK	81
c1812233 AK	82	int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
f7293a54 AK	83	char *buf = malloc(buflen);
f7293a54 AK	84	if (buf == NULL) {
f6903667	85	*errnop = ENOMEM;
f7293a54	86	errno = old_errno;
f6903667 AK	87	return NSS_STATUS_TRYAGAIN;
f6903667 AK	88	}
30fb3957 AK	89
	90	if (fct_start == NULL &&
	91	__nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
	92	free(buf);
	93	return NSS_STATUS_UNAVAIL;
	94	}
	95	nip = startp;
	96	fct.ptr = fct_start;
	97	do {
c1812233 AK	98	if (fct.l == _nss_nonlocal_getpwuid_r)
	99	status = NSS_STATUS_NOTFOUND;
	100	else
	101	status = DL_CALL_FCT(fct.l, (uid, &pwbuf, buf, buflen, errnop));
30fb3957 AK	102	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	103	break;
	104	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	105
	106	if (status == NSS_STATUS_SUCCESS) {
f7293a54	107	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	108	status = NSS_STATUS_NOTFOUND;
30fb3957 AK	109	} else if (status != NSS_STATUS_TRYAGAIN) {
30fb3957 AK	110	status = NSS_STATUS_SUCCESS;
f6903667	111	}
30fb3957	112
f7293a54	113	free(buf);
f6903667 AK	114	return status;
	115	}
	116
48479fc7 TA	117	enum nss_status
	118	check_nonlocal_user(const char user, int errnop)
	119	{
30fb3957 AK	120	static const char *fct_name = "getpwnam_r";
	121	static service_user *startp = NULL;
	122	static void *fct_start = NULL;
	123	enum nss_status status;
	124	service_user *nip;
	125	union {
	126	enum nss_status (l)(const char name, struct passwd *pwd,
	127	char buffer, size_t buflen, int errnop);
	128	void *ptr;
	129	} fct;
48479fc7	130	struct passwd pwbuf;
48479fc7	131	int old_errno = errno;
c1812233 AK	132
c1812233 AK	133	int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
48479fc7 TA	134	char *buf = malloc(buflen);
	135	if (buf == NULL) {
	136	*errnop = ENOMEM;
	137	errno = old_errno;
	138	return NSS_STATUS_TRYAGAIN;
	139	}
30fb3957 AK	140
	141	if (fct_start == NULL &&
	142	__nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
	143	free(buf);
	144	return NSS_STATUS_UNAVAIL;
48479fc7	145	}
30fb3957 AK	146	nip = startp;
	147	fct.ptr = fct_start;
	148	do {
c1812233 AK	149	if (fct.l == _nss_nonlocal_getpwnam_r)
	150	status = NSS_STATUS_NOTFOUND;
	151	else
	152	status = DL_CALL_FCT(fct.l, (user, &pwbuf, buf, buflen, errnop));
30fb3957 AK	153	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	154	break;
	155	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	156
	157	if (status == NSS_STATUS_SUCCESS)
	158	status = NSS_STATUS_NOTFOUND;
	159	else if (status != NSS_STATUS_TRYAGAIN)
	160	status = NSS_STATUS_SUCCESS;
	161
48479fc7	162	free(buf);
48479fc7 TA	163	return status;
48479fc7 TA	164	}
f6903667	165
1e78305d	166
f6903667 AK	167	static service_user *pwent_nip = NULL;
	168	static void *pwent_fct_start;
	169	static union {
	170	enum nss_status (l)(struct passwd pwd, char *buffer, size_t buflen,
	171	int *errnop);
	172	void *ptr;
	173	} pwent_fct;
	174	static const char *pwent_fct_name = "getpwent_r";
	175
	176	enum nss_status
	177	_nss_nonlocal_setpwent(int stayopen)
	178	{
	179	static const char *fct_name = "setpwent";
	180	static void *fct_start = NULL;
	181	enum nss_status status;
	182	service_user *nip;
	183	union {
	184	enum nss_status (*l)(int stayopen);
	185	void *ptr;
	186	} fct;
	187
	188	nip = nss_passwd_nonlocal_database();
	189	if (nip == NULL)
	190	return NSS_STATUS_UNAVAIL;
	191	if (fct_start == NULL)
	192	fct_start = __nss_lookup_function(nip, fct_name);
	193	fct.ptr = fct_start;
	194	do {
	195	if (fct.ptr == NULL)
	196	status = NSS_STATUS_UNAVAIL;
	197	else
	198	status = DL_CALL_FCT(fct.l, (stayopen));
	199	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	200	if (status != NSS_STATUS_SUCCESS)
	201	return status;
	202
	203	pwent_nip = nip;
	204	if (pwent_fct_start == NULL)
	205	pwent_fct_start = __nss_lookup_function(nip, pwent_fct_name);
	206	pwent_fct.ptr = pwent_fct_start;
	207	return NSS_STATUS_SUCCESS;
	208	}
	209
	210	enum nss_status
	211	_nss_nonlocal_endpwent(void)
	212	{
	213	static const char *fct_name = "endpwent";
	214	static void *fct_start = NULL;
	215	enum nss_status status;
	216	service_user *nip;
	217	union {
	218	enum nss_status (*l)(void);
	219	void *ptr;
	220	} fct;
	221
	222	pwent_nip = NULL;
	223
	224	nip = nss_passwd_nonlocal_database();
	225	if (nip == NULL)
	226	return NSS_STATUS_UNAVAIL;
	227	if (fct_start == NULL)
	228	fct_start = __nss_lookup_function(nip, fct_name);
	229	fct.ptr = fct_start;
	230	do {
231	if (fct.ptr == NULL)
232	status = NSS_STATUS_UNAVAIL;
233	else
234	status = DL_CALL_FCT(fct.l, ());
235	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
236	return status;
237	}
238
239	enum nss_status
240	_nss_nonlocal_getpwent_r(struct passwd pwd, char buffer, size_t buflen,
241	int *errnop)
242	{
243	enum nss_status status;
a360549e TA	244
a360549e TA	245	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	246	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
a360549e TA	247	return NSS_STATUS_UNAVAIL;
a360549e TA	248
f6903667 AK	249	if (pwent_nip == NULL) {
	250	status = _nss_nonlocal_setpwent(0);
	251	if (status != NSS_STATUS_SUCCESS)
	252	return status;
	253	}
	254	do {
	255	if (pwent_fct.ptr == NULL)
	256	status = NSS_STATUS_UNAVAIL;
	257	else {
	258	int nonlocal_errno;
	259	do
a360549e	260	status = DL_CALL_FCT(pwent_fct.l, (pwd, buffer, buflen, errnop));
f6903667 AK	261	while (status == NSS_STATUS_SUCCESS &&
	262	check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	263	}
	264	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	265	return status;
	266
	267	if (status == NSS_STATUS_SUCCESS)
	268	return NSS_STATUS_SUCCESS;
	269	} while (__nss_next(&pwent_nip, pwent_fct_name, &pwent_fct.ptr, status, 0) == 0);
	270
	271	pwent_nip = NULL;
	272	return NSS_STATUS_NOTFOUND;
	273	}
	274
	275
	276	enum nss_status
	277	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	278	char buffer, size_t buflen, int errnop)
	279	{
	280	static const char *fct_name = "getpwnam_r";
	281	static void *fct_start = NULL;
	282	enum nss_status status;
	283	service_user *nip;
	284	union {
	285	enum nss_status (l)(const char name, struct passwd *pwd,
	286	char buffer, size_t buflen, int errnop);
	287	void *ptr;
	288	} fct;
	289	int group_errno;
	290
a360549e	291	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	292	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
48479fc7 TA	293	return NSS_STATUS_UNAVAIL;
48479fc7 TA	294
f6903667 AK	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, (name, 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(name, pwd->pw_uid, errnop);
	313	if (status != NSS_STATUS_SUCCESS)
	314	return status;
	315
	316	if (check_nonlocal_gid(name, pwd->pw_gid, &group_errno) !=
	317	NSS_STATUS_SUCCESS)
	318	pwd->pw_gid = 65534 /* nogroup */;
	319	return NSS_STATUS_SUCCESS;
	320	}
	321
	322	enum nss_status
	323	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	324	char buffer, size_t buflen, int errnop)
	325	{
	326	static const char *fct_name = "getpwuid_r";
	327	static void *fct_start = NULL;
	328	enum nss_status status;
	329	service_user *nip;
	330	union {
	331	enum nss_status (l)(uid_t uid, struct passwd pwd,
	332	char buffer, size_t buflen, int errnop);
	333	void *ptr;
	334	} fct;
	335	int group_errno;
	336
a360549e	337	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	338	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
f6903667 AK	339	return NSS_STATUS_UNAVAIL;
	340
	341	nip = nss_passwd_nonlocal_database();
	342	if (nip == NULL)
	343	return NSS_STATUS_UNAVAIL;
	344	if (fct_start == NULL)
	345	fct_start = __nss_lookup_function(nip, fct_name);
	346	fct.ptr = fct_start;
	347	do {
	348	if (fct.ptr == NULL)
	349	status = NSS_STATUS_UNAVAIL;
	350	else
	351	status = DL_CALL_FCT(fct.l, (uid, pwd, buffer, buflen, errnop));
	352	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	353	break;
	354	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	355	if (status != NSS_STATUS_SUCCESS)
	356	return status;
	357
	358	status = check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, errnop);
	359	if (status != NSS_STATUS_SUCCESS)
	360	return status;
	361
	362	if (check_nonlocal_gid(pwd->pw_name, pwd->pw_gid, &group_errno) !=
	363	NSS_STATUS_SUCCESS)
	364	pwd->pw_gid = 65534 /* nogroup */;
	365	return NSS_STATUS_SUCCESS;
	366	}