[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 {
    morebuf:
	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) {
	    free(buf);
	    buflen *= 2;
	    buf = malloc(buflen);
	    if (buf == NULL) {
		*errnop = ENOMEM;
		errno = old_errno;
		return NSS_STATUS_TRYAGAIN;
	    }
	    goto morebuf;
	}
    } 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 {
    morebuf:
	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) {
	    free(buf);
	    buflen *= 2;
	    buf = malloc(buflen);
	    if (buf == NULL) {
		*errnop = ENOMEM;
		errno = old_errno;
		return NSS_STATUS_TRYAGAIN;
	    }
	    goto morebuf;
	}
    } 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 {
d905b369	98	morebuf:
c1812233 AK	99	if (fct.l == _nss_nonlocal_getpwuid_r)
	100	status = NSS_STATUS_NOTFOUND;
	101	else
	102	status = DL_CALL_FCT(fct.l, (uid, &pwbuf, buf, buflen, errnop));
d905b369 AK	103	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
	104	free(buf);
	105	buflen *= 2;
	106	buf = malloc(buflen);
	107	if (buf == NULL) {
	108	*errnop = ENOMEM;
	109	errno = old_errno;
	110	return NSS_STATUS_TRYAGAIN;
	111	}
	112	goto morebuf;
	113	}
30fb3957 AK	114	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	115
	116	if (status == NSS_STATUS_SUCCESS) {
f7293a54	117	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	118	status = NSS_STATUS_NOTFOUND;
30fb3957 AK	119	} else if (status != NSS_STATUS_TRYAGAIN) {
30fb3957 AK	120	status = NSS_STATUS_SUCCESS;
f6903667	121	}
30fb3957	122
f7293a54	123	free(buf);
f6903667 AK	124	return status;
	125	}
	126
48479fc7 TA	127	enum nss_status
	128	check_nonlocal_user(const char user, int errnop)
	129	{
30fb3957 AK	130	static const char *fct_name = "getpwnam_r";
	131	static service_user *startp = NULL;
	132	static void *fct_start = NULL;
	133	enum nss_status status;
	134	service_user *nip;
	135	union {
	136	enum nss_status (l)(const char name, struct passwd *pwd,
	137	char buffer, size_t buflen, int errnop);
	138	void *ptr;
	139	} fct;
48479fc7	140	struct passwd pwbuf;
48479fc7	141	int old_errno = errno;
c1812233 AK	142
c1812233 AK	143	int buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
48479fc7 TA	144	char *buf = malloc(buflen);
	145	if (buf == NULL) {
	146	*errnop = ENOMEM;
	147	errno = old_errno;
	148	return NSS_STATUS_TRYAGAIN;
	149	}
30fb3957 AK	150
	151	if (fct_start == NULL &&
	152	__nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
	153	free(buf);
	154	return NSS_STATUS_UNAVAIL;
48479fc7	155	}
30fb3957 AK	156	nip = startp;
	157	fct.ptr = fct_start;
	158	do {
d905b369	159	morebuf:
c1812233 AK	160	if (fct.l == _nss_nonlocal_getpwnam_r)
	161	status = NSS_STATUS_NOTFOUND;
	162	else
	163	status = DL_CALL_FCT(fct.l, (user, &pwbuf, buf, buflen, errnop));
d905b369 AK	164	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
	165	free(buf);
	166	buflen *= 2;
	167	buf = malloc(buflen);
	168	if (buf == NULL) {
	169	*errnop = ENOMEM;
	170	errno = old_errno;
	171	return NSS_STATUS_TRYAGAIN;
	172	}
	173	goto morebuf;
	174	}
30fb3957 AK	175	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	176
	177	if (status == NSS_STATUS_SUCCESS)
	178	status = NSS_STATUS_NOTFOUND;
	179	else if (status != NSS_STATUS_TRYAGAIN)
	180	status = NSS_STATUS_SUCCESS;
	181
48479fc7	182	free(buf);
48479fc7 TA	183	return status;
48479fc7 TA	184	}
f6903667	185
1e78305d	186
f6903667 AK	187	static service_user *pwent_nip = NULL;
	188	static void *pwent_fct_start;
	189	static union {
	190	enum nss_status (l)(struct passwd pwd, char *buffer, size_t buflen,
	191	int *errnop);
	192	void *ptr;
	193	} pwent_fct;
	194	static const char *pwent_fct_name = "getpwent_r";
	195
	196	enum nss_status
	197	_nss_nonlocal_setpwent(int stayopen)
	198	{
	199	static const char *fct_name = "setpwent";
	200	static void *fct_start = NULL;
	201	enum nss_status status;
	202	service_user *nip;
	203	union {
	204	enum nss_status (*l)(int stayopen);
	205	void *ptr;
	206	} fct;
	207
	208	nip = nss_passwd_nonlocal_database();
	209	if (nip == NULL)
	210	return NSS_STATUS_UNAVAIL;
	211	if (fct_start == NULL)
	212	fct_start = __nss_lookup_function(nip, fct_name);
	213	fct.ptr = fct_start;
	214	do {
	215	if (fct.ptr == NULL)
	216	status = NSS_STATUS_UNAVAIL;
	217	else
	218	status = DL_CALL_FCT(fct.l, (stayopen));
	219	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	220	if (status != NSS_STATUS_SUCCESS)
	221	return status;
	222
	223	pwent_nip = nip;
	224	if (pwent_fct_start == NULL)
	225	pwent_fct_start = __nss_lookup_function(nip, pwent_fct_name);
	226	pwent_fct.ptr = pwent_fct_start;
	227	return NSS_STATUS_SUCCESS;
	228	}
	229
	230	enum nss_status
	231	_nss_nonlocal_endpwent(void)
	232	{
	233	static const char *fct_name = "endpwent";
	234	static void *fct_start = NULL;
	235	enum nss_status status;
	236	service_user *nip;
	237	union {
	238	enum nss_status (*l)(void);
	239	void *ptr;
	240	} fct;
	241
	242	pwent_nip = NULL;
	243
	244	nip = nss_passwd_nonlocal_database();
	245	if (nip == NULL)
	246	return NSS_STATUS_UNAVAIL;
	247	if (fct_start == NULL)
	248	fct_start = __nss_lookup_function(nip, fct_name);
	249	fct.ptr = fct_start;
	250	do {
251	if (fct.ptr == NULL)
252	status = NSS_STATUS_UNAVAIL;
253	else
254	status = DL_CALL_FCT(fct.l, ());
255	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
256	return status;
257	}
258
259	enum nss_status
260	_nss_nonlocal_getpwent_r(struct passwd pwd, char buffer, size_t buflen,
261	int *errnop)
262	{
263	enum nss_status status;
a360549e TA	264
a360549e TA	265	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	266	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
a360549e TA	267	return NSS_STATUS_UNAVAIL;
a360549e TA	268
f6903667 AK	269	if (pwent_nip == NULL) {
	270	status = _nss_nonlocal_setpwent(0);
	271	if (status != NSS_STATUS_SUCCESS)
	272	return status;
	273	}
	274	do {
	275	if (pwent_fct.ptr == NULL)
	276	status = NSS_STATUS_UNAVAIL;
	277	else {
	278	int nonlocal_errno;
	279	do
a360549e	280	status = DL_CALL_FCT(pwent_fct.l, (pwd, buffer, buflen, errnop));
f6903667 AK	281	while (status == NSS_STATUS_SUCCESS &&
	282	check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	283	}
	284	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	285	return status;
	286
	287	if (status == NSS_STATUS_SUCCESS)
	288	return NSS_STATUS_SUCCESS;
	289	} while (__nss_next(&pwent_nip, pwent_fct_name, &pwent_fct.ptr, status, 0) == 0);
	290
	291	pwent_nip = NULL;
	292	return NSS_STATUS_NOTFOUND;
	293	}
	294
	295
	296	enum nss_status
	297	_nss_nonlocal_getpwnam_r(const char name, struct passwd pwd,
	298	char buffer, size_t buflen, int errnop)
	299	{
	300	static const char *fct_name = "getpwnam_r";
	301	static void *fct_start = NULL;
	302	enum nss_status status;
	303	service_user *nip;
	304	union {
	305	enum nss_status (l)(const char name, struct passwd *pwd,
	306	char buffer, size_t buflen, int errnop);
	307	void *ptr;
	308	} fct;
	309	int group_errno;
	310
a360549e	311	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	312	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
48479fc7 TA	313	return NSS_STATUS_UNAVAIL;
48479fc7 TA	314
f6903667 AK	315	nip = nss_passwd_nonlocal_database();
	316	if (nip == NULL)
	317	return NSS_STATUS_UNAVAIL;
	318	if (fct_start == NULL)
	319	fct_start = __nss_lookup_function(nip, fct_name);
	320	fct.ptr = fct_start;
	321	do {
	322	if (fct.ptr == NULL)
	323	status = NSS_STATUS_UNAVAIL;
	324	else
	325	status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop));
	326	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	327	break;
	328	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	329	if (status != NSS_STATUS_SUCCESS)
	330	return status;
	331
	332	status = check_nonlocal_uid(name, pwd->pw_uid, errnop);
	333	if (status != NSS_STATUS_SUCCESS)
	334	return status;
	335
	336	if (check_nonlocal_gid(name, pwd->pw_gid, &group_errno) !=
	337	NSS_STATUS_SUCCESS)
	338	pwd->pw_gid = 65534 /* nogroup */;
	339	return NSS_STATUS_SUCCESS;
	340	}
	341
	342	enum nss_status
	343	_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
	344	char buffer, size_t buflen, int errnop)
	345	{
	346	static const char *fct_name = "getpwuid_r";
	347	static void *fct_start = NULL;
	348	enum nss_status status;
	349	service_user *nip;
	350	union {
	351	enum nss_status (l)(uid_t uid, struct passwd pwd,
	352	char buffer, size_t buflen, int errnop);
	353	void *ptr;
	354	} fct;
	355	int group_errno;
	356
a360549e	357	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	358	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
f6903667 AK	359	return NSS_STATUS_UNAVAIL;
	360
	361	nip = nss_passwd_nonlocal_database();
	362	if (nip == NULL)
	363	return NSS_STATUS_UNAVAIL;
	364	if (fct_start == NULL)
	365	fct_start = __nss_lookup_function(nip, fct_name);
	366	fct.ptr = fct_start;
	367	do {
	368	if (fct.ptr == NULL)
	369	status = NSS_STATUS_UNAVAIL;
	370	else
	371	status = DL_CALL_FCT(fct.l, (uid, pwd, buffer, buflen, errnop));
	372	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	373	break;
	374	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	375	if (status != NSS_STATUS_SUCCESS)
	376	return status;
	377
	378	status = check_nonlocal_uid(pwd->pw_name, pwd->pw_uid, errnop);
	379	if (status != NSS_STATUS_SUCCESS)
	380	return status;
	381
	382	if (check_nonlocal_gid(pwd->pw_name, pwd->pw_gid, &group_errno) !=
	383	NSS_STATUS_SUCCESS)
	384	pwd->pw_gid = 65534 /* nogroup */;
	385	return NSS_STATUS_SUCCESS;
	386	}