[nss_nonlocal.git] / nonlocal-group.c

/*
 * nonlocal-group.c
 * group 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 <grp.h>
#include <nss.h>
#include "nsswitch-internal.h"
#include "nonlocal.h"

/*
 * If the MAGIC_NONLOCAL_GROUPNAME local group exists, then nonlocal
 * users will be automatically added to it.  Furthermore, if a local
 * user is added to this group, then that user will inherit any
 * nonlocal supplementary gids from a nonlocal user of the same name.
 */
#define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"

/*
 * If the MAGIC_LOCAL_GROUPNAME local group exists, then local users
 * will be automatically added to it.
 */
#define MAGIC_LOCAL_GROUPNAME "nss-local-users"


enum nss_status
_nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
			 char *buffer, size_t buflen, int *errnop);

enum nss_status
_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
			 char *buffer, size_t buflen, int *errnop);


static service_user *__nss_group_nonlocal_database;

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

    *ni = __nss_group_nonlocal_database;

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


enum nss_status
check_nonlocal_gid(const char *user, gid_t gid, int *errnop)
{
    enum nss_status status;
    struct group gbuf;
    char *buf;
    size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
    const struct walk_nss w = {
	.lookup = &__nss_group_lookup, .fct_name = "getgrgid_r",
	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
    };
    const __typeof__(&_nss_nonlocal_getgrgid_r) self = &_nss_nonlocal_getgrgid_r;
#define args (gid, &gbuf, buf, buflen, errnop)
#include "walk_nss.h"
#undef args

    if (status == NSS_STATUS_SUCCESS) {
	syslog(LOG_DEBUG, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
	free(buf);
	status = NSS_STATUS_NOTFOUND;
    } else if (status != NSS_STATUS_TRYAGAIN) {
	status = NSS_STATUS_SUCCESS;
    }

    return status;
}

enum nss_status
check_nonlocal_group(const char *user, struct group *grp, int *errnop)
{
    enum nss_status status = NSS_STATUS_SUCCESS;
    int old_errno = errno;
    char *end;
    unsigned long gid;

    errno = 0;
    gid = strtoul(grp->gr_name, &end, 10);
    if (errno == 0 && *end == '\0' && (gid_t)gid == gid) {
	errno = old_errno;
	status = check_nonlocal_gid(user, gid, errnop);
    } else
	errno = old_errno;
    if (status != NSS_STATUS_SUCCESS)
	return status;

    return check_nonlocal_gid(user, grp->gr_gid, errnop);
}

enum nss_status
get_local_group(const char *name, struct group *grp, char **buffer, int *errnop)
{
    enum nss_status status;
    size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
    const struct walk_nss w = {
	.lookup = &__nss_group_lookup, .fct_name = "getgrnam_r",
	.status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
    };
    const __typeof__(&_nss_nonlocal_getgrnam_r) self = &_nss_nonlocal_getgrnam_r;
#define args (name, grp, *buffer, buflen, errnop)
#include "walk_nss.h"
#undef args
    return status;
}

static service_user *grent_startp, *grent_nip;
static void *grent_fct_start;
static union {
    enum nss_status (*l)(struct group *grp, char *buffer, size_t buflen,
			 int *errnop);
    void *ptr;
} grent_fct;
static const char *grent_fct_name = "getgrent_r";

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

    if (grent_fct_start == NULL)
	__nss_group_nonlocal_lookup(&grent_startp, grent_fct_name,
				    &grent_fct_start);
    grent_nip = grent_startp;
    grent_fct.ptr = grent_fct_start;
    return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nonlocal_endgrent(void)
{
    enum nss_status status;
    const struct walk_nss w = {
	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "endgrent",
	.status = &status
    };
    const __typeof__(&_nss_nonlocal_endgrent) self = NULL;

    grent_nip = NULL;

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

enum nss_status
_nss_nonlocal_getgrent_r(struct group *grp, 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 (grent_nip == NULL) {
	status = _nss_nonlocal_setgrent(0);
	if (status != NSS_STATUS_SUCCESS)
	    return status;
    }
    do {
	if (grent_fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else {
	    int nonlocal_errno;
	    do
		status = DL_CALL_FCT(grent_fct.l, (grp, buffer, buflen, errnop));
	    while (status == NSS_STATUS_SUCCESS &&
		   check_nonlocal_group("(unknown)", grp, &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(&grent_nip, grent_fct_name, &grent_fct.ptr, status, 0) == 0);

    grent_nip = NULL;
    return NSS_STATUS_NOTFOUND;
}


enum nss_status
_nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
			 char *buffer, size_t buflen, int *errnop)
{
    enum nss_status status;
    const struct walk_nss w = {
	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrnam_r",
	.status = &status, .errnop = errnop
    };
    const __typeof__(&_nss_nonlocal_getgrnam_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, grp, buffer, buflen, errnop)
#include "walk_nss.h"
#undef args
    if (status != NSS_STATUS_SUCCESS)
	return status;

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

    return check_nonlocal_group(name, grp, errnop);
}

enum nss_status
_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
			 char *buffer, size_t buflen, int *errnop)
{
    enum nss_status status;
    const struct walk_nss w = {
	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrgid_r",
	.status = &status, .errnop = errnop
    };
    const __typeof__(&_nss_nonlocal_getgrgid_r) self = NULL;

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

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

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

    return check_nonlocal_group(grp->gr_name, grp, errnop);
}

static bool
add_group(gid_t group, long int *start, long int *size, gid_t **groupsp,
	  long int limit, int *errnop, enum nss_status *status)
{
    int i, old_errno = errno;
    for (i = 0; i < *start; ++i)
	if ((*groupsp)[i] == group)
	    return true;
    if (*start + 1 > *size) {
	gid_t *newgroups;
	long int newsize = 2 * *size;
	if (limit > 0) {
	    if (*size >= limit) {
		*status = NSS_STATUS_SUCCESS;
		return false;
	    }
	    if (newsize > limit)
		newsize = limit;
	}
	newgroups = realloc(*groupsp, newsize * sizeof((*groupsp)[0]));
	errno = old_errno;
	if (newgroups == NULL) {
	    *errnop = ENOMEM;
	    *status = NSS_STATUS_TRYAGAIN;
	    return false;
	}
	*groupsp = newgroups;
	*size = newsize;
    }
    (*groupsp)[(*start)++] = group;
    return true;
}

enum nss_status
_nss_nonlocal_initgroups_dyn(const char *user, gid_t group, long int *start,
			     long int *size, gid_t **groupsp, long int limit,
			     int *errnop)
{
    enum nss_status status;
    const struct walk_nss w = {
	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "initgroups_dyn",
	.status = &status, .errnop = errnop
    };
    const __typeof__(&_nss_nonlocal_initgroups_dyn) self = NULL;

    struct group local_users_group, nonlocal_users_group;
    bool is_nonlocal = true;
    char *buffer;
    int in, out, i;

    /* Check that the user is a nonlocal user, or a member of the
     * MAGIC_NONLOCAL_GROUPNAME group, before adding any groups. */
    status = check_nonlocal_user(user, errnop);
    if (status == NSS_STATUS_TRYAGAIN) {
	return status;
    } else if (status != NSS_STATUS_SUCCESS) {
	is_nonlocal = false;

	status = get_local_group(MAGIC_LOCAL_GROUPNAME,
				 &local_users_group, &buffer, errnop);
	if (status == NSS_STATUS_SUCCESS) {
	    free(buffer);
	    if (!add_group(local_users_group.gr_gid, start, size, groupsp,
			   limit, errnop, &status))
		return status;
	} else if (status == NSS_STATUS_TRYAGAIN) {
	    return status;
	} else {
	    syslog(LOG_WARNING,
		   "nss_nonlocal: Group %s does not exist locally!",
		   MAGIC_LOCAL_GROUPNAME);
	}
    }

    status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
			     &nonlocal_users_group, &buffer, errnop);
    if (status == NSS_STATUS_SUCCESS) {
	free(buffer);
	if (is_nonlocal) {
	    if (!add_group(nonlocal_users_group.gr_gid, start, size, groupsp,
			   limit, errnop, &status))
		return status;
	} else {
	    int i;
	    for (i = 0; i < *start; ++i) {
		if ((*groupsp)[i] == nonlocal_users_group.gr_gid) {
		    is_nonlocal = true;
		    break;
		}
	    }
	}
    } else if (status == NSS_STATUS_TRYAGAIN) {
	if (is_nonlocal)
	    return status;
    } else {
	syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
	       MAGIC_NONLOCAL_GROUPNAME);
    }

    if (!is_nonlocal)
	return NSS_STATUS_SUCCESS;

    in = out = *start;

#define args (user, group, start, size, groupsp, limit, errnop)
#include "walk_nss.h"
#undef args
    if (status != NSS_STATUS_SUCCESS)
        return status;

    for (; in < *start; ++in) {
	int nonlocal_errno = *errnop;

	for (i = 0; i < out; ++i)
	    if ((*groupsp)[i] == (*groupsp)[in])
		break;
	if (i < out)
	    continue;

	status = check_nonlocal_gid(user, (*groupsp)[in], &nonlocal_errno);
	if (status == NSS_STATUS_SUCCESS) {
	    (*groupsp)[out++] = (*groupsp)[in];
	} else if (status == NSS_STATUS_TRYAGAIN) {
	    *start = out;
	    *errnop = nonlocal_errno;
	    return status;
	}
    }

    *start = out;
    return NSS_STATUS_SUCCESS;
}
Commit	Line	Data
f6903667 AK	1	/*
	2	* nonlocal-group.c
	3	* group 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	#define _GNU_SOURCE
	27	#include <sys/types.h>
	28	#include <unistd.h>
	29	#include <stdlib.h>
	30	#include <stdint.h>
	31	#include <string.h>
	32	#include <dlfcn.h>
	33	#include <stdio.h>
	34	#include <syslog.h>
	35	#include <errno.h>
	36	#include <grp.h>
	37	#include <nss.h>
	38	#include "nsswitch-internal.h"
	39	#include "nonlocal.h"
	40
6ca16423 AK	41	/*
6ca16423 AK	42	* If the MAGIC_NONLOCAL_GROUPNAME local group exists, then nonlocal
34cfeb28 AK	43	* users will be automatically added to it. Furthermore, if a local
	44	* user is added to this group, then that user will inherit any
	45	* nonlocal supplementary gids from a nonlocal user of the same name.
6ca16423	46	*/
48479fc7	47	#define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"
6ca16423 AK	48
	49	/*
	50	* If the MAGIC_LOCAL_GROUPNAME local group exists, then local users
	51	* will be automatically added to it.
	52	*/
48479fc7	53	#define MAGIC_LOCAL_GROUPNAME "nss-local-users"
f7293a54	54
f6903667	55
c1812233 AK	56	enum nss_status
	57	_nss_nonlocal_getgrnam_r(const char name, struct group grp,
	58	char buffer, size_t buflen, int errnop);
	59
	60	enum nss_status
	61	_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
	62	char buffer, size_t buflen, int errnop);
	63
	64
cbb0e3ea AK	65	static service_user *__nss_group_nonlocal_database;
	66
	67	static int
	68	internal_function
	69	__nss_group_nonlocal_lookup(service_user *ni, const char fct_name,
	70	void **fctp)
f6903667	71	{
cbb0e3ea AK	72	if (__nss_group_nonlocal_database == NULL
	73	&& __nss_database_lookup("group_nonlocal", NULL, NULL,
	74	&__nss_group_nonlocal_database) < 0)
	75	return -1;
	76
	77	*ni = __nss_group_nonlocal_database;
48479fc7	78
cbb0e3ea AK	79	fctp = __nss_lookup_function(ni, fct_name);
cbb0e3ea AK	80	return 0;
f6903667 AK	81	}
	82
	83
f6903667 AK	84	enum nss_status
	85	check_nonlocal_gid(const char user, gid_t gid, int errnop)
	86	{
30fb3957	87	enum nss_status status;
f7293a54	88	struct group gbuf;
cbb0e3ea	89	char *buf;
8870ee9c	90	size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
cbb0e3ea AK	91	const struct walk_nss w = {
	92	.lookup = &__nss_group_lookup, .fct_name = "getgrgid_r",
	93	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
	94	};
	95	const __typeof__(&_nss_nonlocal_getgrgid_r) self = &_nss_nonlocal_getgrgid_r;
	96	#define args (gid, &gbuf, buf, buflen, errnop)
	97	#include "walk_nss.h"
	98	#undef args
30fb3957 AK	99
30fb3957 AK	100	if (status == NSS_STATUS_SUCCESS) {
21b6ddd9	101	syslog(LOG_DEBUG, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
cbb0e3ea	102	free(buf);
f6903667	103	status = NSS_STATUS_NOTFOUND;
30fb3957 AK	104	} else if (status != NSS_STATUS_TRYAGAIN) {
30fb3957 AK	105	status = NSS_STATUS_SUCCESS;
f6903667	106	}
30fb3957	107
f6903667 AK	108	return status;
	109	}
	110
cf338316 AK	111	enum nss_status
	112	check_nonlocal_group(const char user, struct group grp, int *errnop)
	113	{
a07a7616 AK	114	enum nss_status status = NSS_STATUS_SUCCESS;
	115	int old_errno = errno;
	116	char *end;
	117	unsigned long gid;
	118
	119	errno = 0;
	120	gid = strtoul(grp->gr_name, &end, 10);
f4061d47 AK	121	if (errno == 0 && *end == '\0' && (gid_t)gid == gid) {
f4061d47 AK	122	errno = old_errno;
a07a7616	123	status = check_nonlocal_gid(user, gid, errnop);
f4061d47 AK	124	} else
f4061d47 AK	125	errno = old_errno;
a07a7616 AK	126	if (status != NSS_STATUS_SUCCESS)
	127	return status;
	128
cf338316 AK	129	return check_nonlocal_gid(user, grp->gr_gid, errnop);
	130	}
	131
48479fc7	132	enum nss_status
8aa9014e	133	get_local_group(const char name, struct group grp, char *buffer, int errnop)
48479fc7	134	{
30fb3957	135	enum nss_status status;
cbb0e3ea AK	136	size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
	137	const struct walk_nss w = {
	138	.lookup = &__nss_group_lookup, .fct_name = "getgrnam_r",
	139	.status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
	140	};
	141	const __typeof__(&_nss_nonlocal_getgrnam_r) self = &_nss_nonlocal_getgrnam_r;
	142	#define args (name, grp, *buffer, buflen, errnop)
	143	#include "walk_nss.h"
	144	#undef args
48479fc7 TA	145	return status;
48479fc7 TA	146	}
f6903667	147
cbb0e3ea	148	static service_user grent_startp, grent_nip;
f6903667 AK	149	static void *grent_fct_start;
	150	static union {
	151	enum nss_status (l)(struct group grp, char *buffer, size_t buflen,
	152	int *errnop);
	153	void *ptr;
	154	} grent_fct;
	155	static const char *grent_fct_name = "getgrent_r";
	156
	157	enum nss_status
	158	_nss_nonlocal_setgrent(int stayopen)
	159	{
f6903667	160	enum nss_status status;
cbb0e3ea AK	161	const struct walk_nss w = {
	162	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "setgrent",
	163	.status = &status
	164	};
	165	const __typeof__(&_nss_nonlocal_setgrent) self = NULL;
	166	#define args (stayopen)
	167	#include "walk_nss.h"
	168	#undef args
f6903667 AK	169	if (status != NSS_STATUS_SUCCESS)
	170	return status;
	171
f6903667	172	if (grent_fct_start == NULL)
cbb0e3ea AK	173	__nss_group_nonlocal_lookup(&grent_startp, grent_fct_name,
	174	&grent_fct_start);
	175	grent_nip = grent_startp;
f6903667 AK	176	grent_fct.ptr = grent_fct_start;
	177	return NSS_STATUS_SUCCESS;
	178	}
	179
	180	enum nss_status
	181	_nss_nonlocal_endgrent(void)
	182	{
f6903667	183	enum nss_status status;
cbb0e3ea AK	184	const struct walk_nss w = {
	185	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "endgrent",
	186	.status = &status
	187	};
	188	const __typeof__(&_nss_nonlocal_endgrent) self = NULL;
f6903667 AK	189
	190	grent_nip = NULL;
	191
cbb0e3ea AK	192	#define args ()
	193	#include "walk_nss.h"
	194	#undef args
f6903667 AK	195	return status;
	196	}
	197
	198	enum nss_status
	199	_nss_nonlocal_getgrent_r(struct group grp, char buffer, size_t buflen,
	200	int *errnop)
	201	{
	202	enum nss_status status;
a360549e TA	203
a360549e TA	204	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	205	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
a360549e TA	206	return NSS_STATUS_UNAVAIL;
a360549e TA	207
f6903667 AK	208	if (grent_nip == NULL) {
	209	status = _nss_nonlocal_setgrent(0);
	210	if (status != NSS_STATUS_SUCCESS)
	211	return status;
	212	}
	213	do {
	214	if (grent_fct.ptr == NULL)
	215	status = NSS_STATUS_UNAVAIL;
	216	else {
	217	int nonlocal_errno;
	218	do
	219	status = DL_CALL_FCT(grent_fct.l, (grp, buffer, buflen, errnop));
	220	while (status == NSS_STATUS_SUCCESS &&
cf338316	221	check_nonlocal_group("(unknown)", grp, &nonlocal_errno) != NSS_STATUS_SUCCESS);
f6903667 AK	222	}
	223	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	224	return status;
	225
	226	if (status == NSS_STATUS_SUCCESS)
	227	return NSS_STATUS_SUCCESS;
	228	} while (__nss_next(&grent_nip, grent_fct_name, &grent_fct.ptr, status, 0) == 0);
	229
	230	grent_nip = NULL;
	231	return NSS_STATUS_NOTFOUND;
	232	}
	233
	234
	235	enum nss_status
	236	_nss_nonlocal_getgrnam_r(const char name, struct group grp,
	237	char buffer, size_t buflen, int errnop)
	238	{
f6903667	239	enum nss_status status;
cbb0e3ea AK	240	const struct walk_nss w = {
	241	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrnam_r",
	242	.status = &status, .errnop = errnop
	243	};
	244	const __typeof__(&_nss_nonlocal_getgrnam_r) self = NULL;
f6903667	245
a360549e	246	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	247	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
48479fc7 TA	248	return NSS_STATUS_UNAVAIL;
48479fc7 TA	249
cbb0e3ea AK	250	#define args (name, grp, buffer, buflen, errnop)
	251	#include "walk_nss.h"
	252	#undef args
f6903667 AK	253	if (status != NSS_STATUS_SUCCESS)
	254	return status;
	255
22562df0 AK	256	if (strcmp(name, grp->gr_name) != 0) {
	257	syslog(LOG_ERR, "nss_nonlocal: discarding group %s from lookup for group %s\n", grp->gr_name, name);
	258	return NSS_STATUS_NOTFOUND;
	259	}
	260
cf338316	261	return check_nonlocal_group(name, grp, errnop);
f6903667 AK	262	}
	263
	264	enum nss_status
	265	_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
	266	char buffer, size_t buflen, int errnop)
	267	{
f6903667	268	enum nss_status status;
cbb0e3ea AK	269	const struct walk_nss w = {
	270	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrgid_r",
	271	.status = &status, .errnop = errnop
	272	};
	273	const __typeof__(&_nss_nonlocal_getgrgid_r) self = NULL;
f6903667	274
a360549e	275	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	276	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
f6903667 AK	277	return NSS_STATUS_UNAVAIL;
f6903667 AK	278
cbb0e3ea AK	279	#define args (gid, grp, buffer, buflen, errnop)
	280	#include "walk_nss.h"
	281	#undef args
f6903667 AK	282	if (status != NSS_STATUS_SUCCESS)
	283	return status;
	284
8027fdc4 AK	285	if (gid != grp->gr_gid) {
	286	syslog(LOG_ERR, "nss_nonlocal: discarding gid %d from lookup for gid %d\n", grp->gr_gid, gid);
	287	return NSS_STATUS_NOTFOUND;
	288	}
	289
cf338316	290	return check_nonlocal_group(grp->gr_name, grp, errnop);
f6903667 AK	291	}
f6903667 AK	292
dfc6e292 AK	293	static bool
	294	add_group(gid_t group, long int start, long int size, gid_t **groupsp,
	295	long int limit, int errnop, enum nss_status status)
	296	{
	297	int i, old_errno = errno;
	298	for (i = 0; i < *start; ++i)
	299	if ((*groupsp)[i] == group)
	300	return true;
	301	if (start + 1 > size) {
	302	gid_t *newgroups;
	303	long int newsize = 2 * *size;
	304	if (limit > 0) {
	305	if (*size >= limit) {
	306	*status = NSS_STATUS_SUCCESS;
	307	return false;
	308	}
	309	if (newsize > limit)
	310	newsize = limit;
	311	}
	312	newgroups = realloc(groupsp, newsize sizeof((*groupsp)[0]));
	313	errno = old_errno;
	314	if (newgroups == NULL) {
	315	*errnop = ENOMEM;
	316	*status = NSS_STATUS_TRYAGAIN;
	317	return false;
	318	}
	319	*groupsp = newgroups;
	320	*size = newsize;
	321	}
	322	(groupsp)[(start)++] = group;
	323	return true;
	324	}
	325
f6903667 AK	326	enum nss_status
	327	_nss_nonlocal_initgroups_dyn(const char user, gid_t group, long int start,
	328	long int size, gid_t *groupsp, long int limit,
	329	int *errnop)
	330	{
f6903667	331	enum nss_status status;
cbb0e3ea AK	332	const struct walk_nss w = {
	333	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "initgroups_dyn",
	334	.status = &status, .errnop = errnop
	335	};
	336	const __typeof__(&_nss_nonlocal_initgroups_dyn) self = NULL;
1e78305d AK	337
1e78305d AK	338	struct group local_users_group, nonlocal_users_group;
b3831d60	339	bool is_nonlocal = true;
1e78305d	340	char *buffer;
d7bf1d11	341	int in, out, i;
48479fc7	342
34cfeb28 AK	343	/* Check that the user is a nonlocal user, or a member of the
34cfeb28 AK	344	* MAGIC_NONLOCAL_GROUPNAME group, before adding any groups. */
48479fc7	345	status = check_nonlocal_user(user, errnop);
3010a54b	346	if (status == NSS_STATUS_TRYAGAIN) {
48479fc7	347	return status;
3010a54b	348	} else if (status != NSS_STATUS_SUCCESS) {
b3831d60	349	is_nonlocal = false;
48479fc7	350
3010a54b AK	351	status = get_local_group(MAGIC_LOCAL_GROUPNAME,
	352	&local_users_group, &buffer, errnop);
	353	if (status == NSS_STATUS_SUCCESS) {
	354	free(buffer);
	355	if (!add_group(local_users_group.gr_gid, start, size, groupsp,
	356	limit, errnop, &status))
	357	return status;
	358	} else if (status == NSS_STATUS_TRYAGAIN) {
dfc6e292	359	return status;
3010a54b AK	360	} else {
	361	syslog(LOG_WARNING,
	362	"nss_nonlocal: Group %s does not exist locally!",
	363	MAGIC_LOCAL_GROUPNAME);
	364	}
a4e1e153 AK	365	}
	366
	367	status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
	368	&nonlocal_users_group, &buffer, errnop);
	369	if (status == NSS_STATUS_SUCCESS) {
	370	free(buffer);
	371	if (is_nonlocal) {
dfc6e292 AK	372	if (!add_group(nonlocal_users_group.gr_gid, start, size, groupsp,
	373	limit, errnop, &status))
	374	return status;
34cfeb28 AK	375	} else {
	376	int i;
	377	for (i = 0; i < *start; ++i) {
	378	if ((*groupsp)[i] == nonlocal_users_group.gr_gid) {
	379	is_nonlocal = true;
	380	break;
	381	}
	382	}
1e78305d	383	}
a4e1e153 AK	384	} else if (status == NSS_STATUS_TRYAGAIN) {
	385	if (is_nonlocal)
	386	return status;
	387	} else {
	388	syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
	389	MAGIC_NONLOCAL_GROUPNAME);
48479fc7	390	}
f6903667	391
b3831d60	392	if (!is_nonlocal)
1e78305d AK	393	return NSS_STATUS_SUCCESS;
1e78305d AK	394
d7bf1d11	395	in = out = *start;
1e78305d	396
cbb0e3ea AK	397	#define args (user, group, start, size, groupsp, limit, errnop)
	398	#include "walk_nss.h"
	399	#undef args
f6903667 AK	400	if (status != NSS_STATUS_SUCCESS)
	401	return status;
	402
	403	for (; in < *start; ++in) {
	404	int nonlocal_errno = *errnop;
	405
	406	for (i = 0; i < out; ++i)
	407	if ((groupsp)[i] == (groupsp)[in])
	408	break;
	409	if (i < out)
	410	continue;
	411
	412	status = check_nonlocal_gid(user, (*groupsp)[in], &nonlocal_errno);
	413	if (status == NSS_STATUS_SUCCESS) {
1e78305d	414	(groupsp)[out++] = (groupsp)[in];
5879a696	415	} else if (status == NSS_STATUS_TRYAGAIN) {
f6903667 AK	416	*start = out;
	417	*errnop = nonlocal_errno;
	418	return status;
	419	}
	420	}
	421
	422	*start = out;
	423	return NSS_STATUS_SUCCESS;
	424	}