[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 <pwd.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 gids from a nonlocal user of the same name, as
 * supplementary gids.
 */
#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"

/*
 * If the MAGIC_NONLOCAL_USERNAME local user is added to a local
 * group, then the local group will inherit the nonlocal membership of
 * a group of the same gid.
 */
#define MAGIC_NONLOCAL_USERNAME "nss-nonlocal-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, const char *group, 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_TRYAGAIN)
	return status;
    else if (status != NSS_STATUS_SUCCESS)
	return NSS_STATUS_SUCCESS;

    if (group == NULL || strcmp(gbuf.gr_name, group) == 0) {
	char *const *mem;
	for (mem = gbuf.gr_mem; *mem != NULL; mem++)
	    if (strcmp(*mem, MAGIC_NONLOCAL_USERNAME) == 0) {
		status = check_nonlocal_user(*mem, errnop);
		if (status == NSS_STATUS_TRYAGAIN) {
		    free(buf);
		    return status;
		} else if (status == NSS_STATUS_NOTFOUND) {
		    free(buf);
		    return NSS_STATUS_SUCCESS;
		}
		break;
	    }
    }

    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);
    return NSS_STATUS_NOTFOUND;
}

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, grp->gr_name, gid, errnop);
    } else
	errno = old_errno;
    if (status != NSS_STATUS_SUCCESS)
	return status;

    return check_nonlocal_gid(user, grp->gr_name, 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;
		}
	    }

	    if (is_nonlocal) {
		struct passwd pwbuf;
		char *buf;
		int nonlocal_errno = *errnop;
		status = get_nonlocal_passwd(user, &pwbuf, &buf, errnop);

		if (status == NSS_STATUS_SUCCESS) {
		    nonlocal_errno = *errnop;
		    status = check_nonlocal_gid(user, NULL, pwbuf.pw_gid,
						&nonlocal_errno);
		    free(buf);
		}

		if (status == NSS_STATUS_SUCCESS) {
		    if (!add_group(pwbuf.pw_gid, start, size, groupsp, limit,
				   errnop, &status))
			return status;
		} else if (status == NSS_STATUS_TRYAGAIN) {
		    *errnop = nonlocal_errno;
		    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, NULL, (*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>
775f7dc3	36	#include <pwd.h>
f6903667 AK	37	#include <grp.h>
	38	#include <nss.h>
	39	#include "nsswitch-internal.h"
	40	#include "nonlocal.h"
	41
6ca16423 AK	42	/*
6ca16423 AK	43	* If the MAGIC_NONLOCAL_GROUPNAME local group exists, then nonlocal
34cfeb28 AK	44	* users will be automatically added to it. Furthermore, if a local
34cfeb28 AK	45	* user is added to this group, then that user will inherit any
775f7dc3 AK	46	* nonlocal gids from a nonlocal user of the same name, as
775f7dc3 AK	47	* supplementary gids.
6ca16423	48	*/
48479fc7	49	#define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"
6ca16423 AK	50
	51	/*
	52	* If the MAGIC_LOCAL_GROUPNAME local group exists, then local users
	53	* will be automatically added to it.
	54	*/
48479fc7	55	#define MAGIC_LOCAL_GROUPNAME "nss-local-users"
f7293a54	56
25468b96 AK	57	/*
	58	* If the MAGIC_NONLOCAL_USERNAME local user is added to a local
	59	* group, then the local group will inherit the nonlocal membership of
	60	* a group of the same gid.
	61	*/
	62	#define MAGIC_NONLOCAL_USERNAME "nss-nonlocal-users"
	63
f6903667	64
c1812233 AK	65	enum nss_status
	66	_nss_nonlocal_getgrnam_r(const char name, struct group grp,
	67	char buffer, size_t buflen, int errnop);
	68
	69	enum nss_status
	70	_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
	71	char buffer, size_t buflen, int errnop);
	72
	73
cbb0e3ea AK	74	static service_user *__nss_group_nonlocal_database;
	75
	76	static int
	77	internal_function
	78	__nss_group_nonlocal_lookup(service_user *ni, const char fct_name,
	79	void **fctp)
f6903667	80	{
cbb0e3ea AK	81	if (__nss_group_nonlocal_database == NULL
	82	&& __nss_database_lookup("group_nonlocal", NULL, NULL,
	83	&__nss_group_nonlocal_database) < 0)
	84	return -1;
	85
	86	*ni = __nss_group_nonlocal_database;
48479fc7	87
cbb0e3ea AK	88	fctp = __nss_lookup_function(ni, fct_name);
cbb0e3ea AK	89	return 0;
f6903667 AK	90	}
	91
	92
f6903667	93	enum nss_status
25468b96	94	check_nonlocal_gid(const char user, const char group, gid_t gid, int *errnop)
f6903667	95	{
30fb3957	96	enum nss_status status;
f7293a54	97	struct group gbuf;
cbb0e3ea	98	char *buf;
8870ee9c	99	size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
cbb0e3ea AK	100	const struct walk_nss w = {
	101	.lookup = &__nss_group_lookup, .fct_name = "getgrgid_r",
	102	.status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
	103	};
	104	const __typeof__(&_nss_nonlocal_getgrgid_r) self = &_nss_nonlocal_getgrgid_r;
	105	#define args (gid, &gbuf, buf, buflen, errnop)
	106	#include "walk_nss.h"
	107	#undef args
30fb3957	108
25468b96 AK	109	if (status == NSS_STATUS_TRYAGAIN)
	110	return status;
	111	else if (status != NSS_STATUS_SUCCESS)
	112	return NSS_STATUS_SUCCESS;
	113
	114	if (group == NULL \|\| strcmp(gbuf.gr_name, group) == 0) {
	115	char const mem;
	116	for (mem = gbuf.gr_mem; *mem != NULL; mem++)
	117	if (strcmp(*mem, MAGIC_NONLOCAL_USERNAME) == 0) {
	118	status = check_nonlocal_user(*mem, errnop);
	119	if (status == NSS_STATUS_TRYAGAIN) {
	120	free(buf);
	121	return status;
	122	} else if (status == NSS_STATUS_NOTFOUND) {
	123	free(buf);
	124	return NSS_STATUS_SUCCESS;
	125	}
	126	break;
	127	}
f6903667	128	}
30fb3957	129
25468b96 AK	130	syslog(LOG_DEBUG, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
	131	free(buf);
	132	return NSS_STATUS_NOTFOUND;
f6903667 AK	133	}
f6903667 AK	134
cf338316 AK	135	enum nss_status
	136	check_nonlocal_group(const char user, struct group grp, int *errnop)
	137	{
a07a7616 AK	138	enum nss_status status = NSS_STATUS_SUCCESS;
	139	int old_errno = errno;
	140	char *end;
	141	unsigned long gid;
	142
	143	errno = 0;
	144	gid = strtoul(grp->gr_name, &end, 10);
f4061d47 AK	145	if (errno == 0 && *end == '\0' && (gid_t)gid == gid) {
f4061d47 AK	146	errno = old_errno;
25468b96	147	status = check_nonlocal_gid(user, grp->gr_name, gid, errnop);
f4061d47 AK	148	} else
f4061d47 AK	149	errno = old_errno;
a07a7616 AK	150	if (status != NSS_STATUS_SUCCESS)
	151	return status;
	152
25468b96	153	return check_nonlocal_gid(user, grp->gr_name, grp->gr_gid, errnop);
cf338316 AK	154	}
cf338316 AK	155
48479fc7	156	enum nss_status
8aa9014e	157	get_local_group(const char name, struct group grp, char *buffer, int errnop)
48479fc7	158	{
30fb3957	159	enum nss_status status;
cbb0e3ea AK	160	size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
	161	const struct walk_nss w = {
	162	.lookup = &__nss_group_lookup, .fct_name = "getgrnam_r",
	163	.status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
	164	};
	165	const __typeof__(&_nss_nonlocal_getgrnam_r) self = &_nss_nonlocal_getgrnam_r;
	166	#define args (name, grp, *buffer, buflen, errnop)
	167	#include "walk_nss.h"
	168	#undef args
48479fc7 TA	169	return status;
48479fc7 TA	170	}
f6903667	171
cbb0e3ea	172	static service_user grent_startp, grent_nip;
f6903667 AK	173	static void *grent_fct_start;
	174	static union {
	175	enum nss_status (l)(struct group grp, char *buffer, size_t buflen,
	176	int *errnop);
	177	void *ptr;
	178	} grent_fct;
	179	static const char *grent_fct_name = "getgrent_r";
	180
	181	enum nss_status
	182	_nss_nonlocal_setgrent(int stayopen)
	183	{
f6903667	184	enum nss_status status;
cbb0e3ea AK	185	const struct walk_nss w = {
	186	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "setgrent",
	187	.status = &status
	188	};
	189	const __typeof__(&_nss_nonlocal_setgrent) self = NULL;
	190	#define args (stayopen)
	191	#include "walk_nss.h"
	192	#undef args
f6903667 AK	193	if (status != NSS_STATUS_SUCCESS)
	194	return status;
	195
f6903667	196	if (grent_fct_start == NULL)
cbb0e3ea AK	197	__nss_group_nonlocal_lookup(&grent_startp, grent_fct_name,
	198	&grent_fct_start);
	199	grent_nip = grent_startp;
f6903667 AK	200	grent_fct.ptr = grent_fct_start;
	201	return NSS_STATUS_SUCCESS;
	202	}
	203
	204	enum nss_status
	205	_nss_nonlocal_endgrent(void)
	206	{
f6903667	207	enum nss_status status;
cbb0e3ea AK	208	const struct walk_nss w = {
	209	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "endgrent",
	210	.status = &status
	211	};
	212	const __typeof__(&_nss_nonlocal_endgrent) self = NULL;
f6903667 AK	213
	214	grent_nip = NULL;
	215
cbb0e3ea AK	216	#define args ()
	217	#include "walk_nss.h"
	218	#undef args
f6903667 AK	219	return status;
	220	}
	221
	222	enum nss_status
	223	_nss_nonlocal_getgrent_r(struct group grp, char buffer, size_t buflen,
	224	int *errnop)
	225	{
	226	enum nss_status status;
a360549e TA	227
a360549e TA	228	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	229	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
a360549e TA	230	return NSS_STATUS_UNAVAIL;
a360549e TA	231
f6903667 AK	232	if (grent_nip == NULL) {
	233	status = _nss_nonlocal_setgrent(0);
	234	if (status != NSS_STATUS_SUCCESS)
	235	return status;
	236	}
	237	do {
	238	if (grent_fct.ptr == NULL)
	239	status = NSS_STATUS_UNAVAIL;
	240	else {
	241	int nonlocal_errno;
	242	do
	243	status = DL_CALL_FCT(grent_fct.l, (grp, buffer, buflen, errnop));
	244	while (status == NSS_STATUS_SUCCESS &&
cf338316	245	check_nonlocal_group("(unknown)", grp, &nonlocal_errno) != NSS_STATUS_SUCCESS);
f6903667 AK	246	}
	247	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	248	return status;
	249
	250	if (status == NSS_STATUS_SUCCESS)
	251	return NSS_STATUS_SUCCESS;
	252	} while (__nss_next(&grent_nip, grent_fct_name, &grent_fct.ptr, status, 0) == 0);
	253
	254	grent_nip = NULL;
	255	return NSS_STATUS_NOTFOUND;
	256	}
	257
	258
	259	enum nss_status
	260	_nss_nonlocal_getgrnam_r(const char name, struct group grp,
	261	char buffer, size_t buflen, int errnop)
	262	{
f6903667	263	enum nss_status status;
cbb0e3ea AK	264	const struct walk_nss w = {
	265	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrnam_r",
	266	.status = &status, .errnop = errnop
	267	};
	268	const __typeof__(&_nss_nonlocal_getgrnam_r) self = NULL;
f6903667	269
a360549e	270	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	271	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
48479fc7 TA	272	return NSS_STATUS_UNAVAIL;
48479fc7 TA	273
cbb0e3ea AK	274	#define args (name, grp, buffer, buflen, errnop)
	275	#include "walk_nss.h"
	276	#undef args
f6903667 AK	277	if (status != NSS_STATUS_SUCCESS)
	278	return status;
	279
22562df0 AK	280	if (strcmp(name, grp->gr_name) != 0) {
	281	syslog(LOG_ERR, "nss_nonlocal: discarding group %s from lookup for group %s\n", grp->gr_name, name);
	282	return NSS_STATUS_NOTFOUND;
	283	}
	284
cf338316	285	return check_nonlocal_group(name, grp, errnop);
f6903667 AK	286	}
	287
	288	enum nss_status
	289	_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
	290	char buffer, size_t buflen, int errnop)
	291	{
f6903667	292	enum nss_status status;
cbb0e3ea AK	293	const struct walk_nss w = {
	294	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrgid_r",
	295	.status = &status, .errnop = errnop
	296	};
	297	const __typeof__(&_nss_nonlocal_getgrgid_r) self = NULL;
f6903667	298
a360549e	299	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	300	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
f6903667 AK	301	return NSS_STATUS_UNAVAIL;
f6903667 AK	302
cbb0e3ea AK	303	#define args (gid, grp, buffer, buflen, errnop)
	304	#include "walk_nss.h"
	305	#undef args
f6903667 AK	306	if (status != NSS_STATUS_SUCCESS)
	307	return status;
	308
8027fdc4 AK	309	if (gid != grp->gr_gid) {
	310	syslog(LOG_ERR, "nss_nonlocal: discarding gid %d from lookup for gid %d\n", grp->gr_gid, gid);
	311	return NSS_STATUS_NOTFOUND;
	312	}
	313
cf338316	314	return check_nonlocal_group(grp->gr_name, grp, errnop);
f6903667 AK	315	}
f6903667 AK	316
dfc6e292 AK	317	static bool
	318	add_group(gid_t group, long int start, long int size, gid_t **groupsp,
	319	long int limit, int errnop, enum nss_status status)
	320	{
	321	int i, old_errno = errno;
	322	for (i = 0; i < *start; ++i)
	323	if ((*groupsp)[i] == group)
	324	return true;
	325	if (start + 1 > size) {
	326	gid_t *newgroups;
	327	long int newsize = 2 * *size;
	328	if (limit > 0) {
	329	if (*size >= limit) {
	330	*status = NSS_STATUS_SUCCESS;
	331	return false;
	332	}
	333	if (newsize > limit)
	334	newsize = limit;
	335	}
	336	newgroups = realloc(groupsp, newsize sizeof((*groupsp)[0]));
	337	errno = old_errno;
	338	if (newgroups == NULL) {
	339	*errnop = ENOMEM;
	340	*status = NSS_STATUS_TRYAGAIN;
	341	return false;
	342	}
	343	*groupsp = newgroups;
	344	*size = newsize;
	345	}
	346	(groupsp)[(start)++] = group;
	347	return true;
	348	}
	349
f6903667 AK	350	enum nss_status
	351	_nss_nonlocal_initgroups_dyn(const char user, gid_t group, long int start,
	352	long int size, gid_t *groupsp, long int limit,
	353	int *errnop)
	354	{
f6903667	355	enum nss_status status;
cbb0e3ea AK	356	const struct walk_nss w = {
	357	.lookup = &__nss_group_nonlocal_lookup, .fct_name = "initgroups_dyn",
	358	.status = &status, .errnop = errnop
	359	};
	360	const __typeof__(&_nss_nonlocal_initgroups_dyn) self = NULL;
1e78305d AK	361
1e78305d AK	362	struct group local_users_group, nonlocal_users_group;
b3831d60	363	bool is_nonlocal = true;
1e78305d	364	char *buffer;
d7bf1d11	365	int in, out, i;
48479fc7	366
34cfeb28 AK	367	/* Check that the user is a nonlocal user, or a member of the
34cfeb28 AK	368	* MAGIC_NONLOCAL_GROUPNAME group, before adding any groups. */
48479fc7	369	status = check_nonlocal_user(user, errnop);
3010a54b	370	if (status == NSS_STATUS_TRYAGAIN) {
48479fc7	371	return status;
3010a54b	372	} else if (status != NSS_STATUS_SUCCESS) {
b3831d60	373	is_nonlocal = false;
48479fc7	374
3010a54b AK	375	status = get_local_group(MAGIC_LOCAL_GROUPNAME,
	376	&local_users_group, &buffer, errnop);
	377	if (status == NSS_STATUS_SUCCESS) {
	378	free(buffer);
	379	if (!add_group(local_users_group.gr_gid, start, size, groupsp,
	380	limit, errnop, &status))
	381	return status;
	382	} else if (status == NSS_STATUS_TRYAGAIN) {
dfc6e292	383	return status;
3010a54b AK	384	} else {
	385	syslog(LOG_WARNING,
	386	"nss_nonlocal: Group %s does not exist locally!",
	387	MAGIC_LOCAL_GROUPNAME);
	388	}
a4e1e153 AK	389	}
	390
	391	status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
	392	&nonlocal_users_group, &buffer, errnop);
	393	if (status == NSS_STATUS_SUCCESS) {
	394	free(buffer);
	395	if (is_nonlocal) {
dfc6e292 AK	396	if (!add_group(nonlocal_users_group.gr_gid, start, size, groupsp,
	397	limit, errnop, &status))
	398	return status;
34cfeb28 AK	399	} else {
	400	int i;
	401	for (i = 0; i < *start; ++i) {
	402	if ((*groupsp)[i] == nonlocal_users_group.gr_gid) {
	403	is_nonlocal = true;
	404	break;
	405	}
	406	}
775f7dc3 AK	407
	408	if (is_nonlocal) {
	409	struct passwd pwbuf;
	410	char *buf;
	411	int nonlocal_errno = *errnop;
	412	status = get_nonlocal_passwd(user, &pwbuf, &buf, errnop);
	413
	414	if (status == NSS_STATUS_SUCCESS) {
	415	nonlocal_errno = *errnop;
25468b96	416	status = check_nonlocal_gid(user, NULL, pwbuf.pw_gid,
775f7dc3 AK	417	&nonlocal_errno);
	418	free(buf);
	419	}
	420
	421	if (status == NSS_STATUS_SUCCESS) {
	422	if (!add_group(pwbuf.pw_gid, start, size, groupsp, limit,
	423	errnop, &status))
	424	return status;
	425	} else if (status == NSS_STATUS_TRYAGAIN) {
	426	*errnop = nonlocal_errno;
	427	return status;
	428	}
	429	}
1e78305d	430	}
a4e1e153 AK	431	} else if (status == NSS_STATUS_TRYAGAIN) {
	432	if (is_nonlocal)
	433	return status;
	434	} else {
	435	syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
	436	MAGIC_NONLOCAL_GROUPNAME);
48479fc7	437	}
f6903667	438
b3831d60	439	if (!is_nonlocal)
1e78305d AK	440	return NSS_STATUS_SUCCESS;
1e78305d AK	441
d7bf1d11	442	in = out = *start;
1e78305d	443
cbb0e3ea AK	444	#define args (user, group, start, size, groupsp, limit, errnop)
	445	#include "walk_nss.h"
	446	#undef args
f6903667 AK	447	if (status != NSS_STATUS_SUCCESS)
	448	return status;
	449
	450	for (; in < *start; ++in) {
	451	int nonlocal_errno = *errnop;
	452
	453	for (i = 0; i < out; ++i)
	454	if ((groupsp)[i] == (groupsp)[in])
	455	break;
	456	if (i < out)
	457	continue;
	458
25468b96 AK	459	status = check_nonlocal_gid(user, NULL, (*groupsp)[in],
25468b96 AK	460	&nonlocal_errno);
f6903667	461	if (status == NSS_STATUS_SUCCESS) {
1e78305d	462	(groupsp)[out++] = (groupsp)[in];
5879a696	463	} else if (status == NSS_STATUS_TRYAGAIN) {
f6903667 AK	464	*start = out;
	465	*errnop = nonlocal_errno;
	466	return status;
	467	}
	468	}
	469
	470	*start = out;
	471	return NSS_STATUS_SUCCESS;
	472	}