[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"

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