3 * group database for nss_nonlocal proxy
5 * Copyright © 2007–2010 Anders Kaseorg <andersk@mit.edu> and Tim
6 * Abbott <tabbott@mit.edu>
8 * This file is part of nss_nonlocal.
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.
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.
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
28 #include <sys/types.h>
41 #include "nsswitch-internal.h"
45 * If the MAGIC_NONLOCAL_GROUPNAME local group exists, then nonlocal
46 * users will be automatically added to it. Furthermore, if a local
47 * user is added to this group, then that user will inherit any
48 * nonlocal gids from a nonlocal user of the same name, as
51 #define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"
54 * If the MAGIC_LOCAL_GROUPNAME local group exists, then local users
55 * will be automatically added to it.
57 #define MAGIC_LOCAL_GROUPNAME "nss-local-users"
60 * If the MAGIC_NONLOCAL_USERNAME local user is added to a local
61 * group, then the local group will inherit the nonlocal membership of
62 * a group of the same gid.
64 #define MAGIC_NONLOCAL_USERNAME "nss-nonlocal-users"
68 _nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
69 char *buffer, size_t buflen, int *errnop);
72 _nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
73 char *buffer, size_t buflen, int *errnop);
76 static service_user *__nss_group_nonlocal_database;
80 __nss_group_nonlocal_lookup(service_user **ni, const char *fct_name,
83 if (__nss_group_nonlocal_database == NULL
84 && __nss_database_lookup("group_nonlocal", NULL, NULL,
85 &__nss_group_nonlocal_database) < 0)
88 *ni = __nss_group_nonlocal_database;
90 *fctp = __nss_lookup_function(*ni, fct_name);
96 check_nonlocal_gid(const char *user, const char *group, gid_t gid, int *errnop)
98 enum nss_status status;
101 size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
102 const struct walk_nss w = {
103 .lookup = &__nss_group_lookup, .fct_name = "getgrgid_r",
104 .status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
106 const __typeof__(&_nss_nonlocal_getgrgid_r) self = &_nss_nonlocal_getgrgid_r;
107 #define args (gid, &gbuf, buf, buflen, errnop)
108 #include "walk_nss.h"
111 if (status == NSS_STATUS_TRYAGAIN)
113 else if (status != NSS_STATUS_SUCCESS)
114 return NSS_STATUS_SUCCESS;
116 if (group == NULL || strcmp(gbuf.gr_name, group) == 0) {
118 for (mem = gbuf.gr_mem; *mem != NULL; mem++)
119 if (strcmp(*mem, MAGIC_NONLOCAL_USERNAME) == 0) {
120 status = check_nonlocal_user(*mem, errnop);
121 if (status == NSS_STATUS_TRYAGAIN) {
124 } else if (status == NSS_STATUS_NOTFOUND) {
126 return NSS_STATUS_SUCCESS;
132 syslog(LOG_DEBUG, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
134 return NSS_STATUS_NOTFOUND;
138 check_nonlocal_group(const char *user, struct group *grp, int *errnop)
140 enum nss_status status = NSS_STATUS_SUCCESS;
141 int old_errno = errno;
146 gid = strtoul(grp->gr_name, &end, 10);
147 if (errno == 0 && *end == '\0' && (gid_t)gid == gid) {
149 status = check_nonlocal_gid(user, grp->gr_name, gid, errnop);
152 if (status != NSS_STATUS_SUCCESS)
155 return check_nonlocal_gid(user, grp->gr_name, grp->gr_gid, errnop);
159 get_local_group(const char *name, struct group *grp, char **buffer, int *errnop)
161 enum nss_status status;
162 size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
163 const struct walk_nss w = {
164 .lookup = &__nss_group_lookup, .fct_name = "getgrnam_r",
165 .status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
167 const __typeof__(&_nss_nonlocal_getgrnam_r) self = &_nss_nonlocal_getgrnam_r;
168 #define args (name, grp, *buffer, buflen, errnop)
169 #include "walk_nss.h"
174 static bool grent_initialized = false;
175 static service_user *grent_startp, *grent_nip;
176 static void *grent_fct_start;
178 enum nss_status (*l)(struct group *grp, char *buffer, size_t buflen,
182 static const char *grent_fct_name = "getgrent_r";
185 _nss_nonlocal_setgrent(int stayopen)
187 enum nss_status status;
188 const struct walk_nss w = {
189 .lookup = &__nss_group_nonlocal_lookup, .fct_name = "setgrent",
192 const __typeof__(&_nss_nonlocal_setgrent) self = NULL;
193 #define args (stayopen)
194 #include "walk_nss.h"
196 if (status != NSS_STATUS_SUCCESS)
199 if (!grent_initialized) {
200 __nss_group_nonlocal_lookup(&grent_startp, grent_fct_name,
202 __sync_synchronize();
203 grent_initialized = true;
205 grent_nip = grent_startp;
206 grent_fct.ptr = grent_fct_start;
207 return NSS_STATUS_SUCCESS;
211 _nss_nonlocal_endgrent(void)
213 enum nss_status status;
214 const struct walk_nss w = {
215 .lookup = &__nss_group_nonlocal_lookup, .fct_name = "endgrent",
218 const __typeof__(&_nss_nonlocal_endgrent) self = NULL;
223 #include "walk_nss.h"
229 _nss_nonlocal_getgrent_r(struct group *grp, char *buffer, size_t buflen,
232 enum nss_status status;
234 char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
235 if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
236 return NSS_STATUS_UNAVAIL;
238 if (grent_nip == NULL) {
239 status = _nss_nonlocal_setgrent(0);
240 if (status != NSS_STATUS_SUCCESS)
244 if (grent_fct.ptr == NULL)
245 status = NSS_STATUS_UNAVAIL;
249 status = DL_CALL_FCT(grent_fct.l, (grp, buffer, buflen, errnop));
250 while (status == NSS_STATUS_SUCCESS &&
251 check_nonlocal_group("(unknown)", grp, &nonlocal_errno) != NSS_STATUS_SUCCESS);
253 if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
256 if (status == NSS_STATUS_SUCCESS)
257 return NSS_STATUS_SUCCESS;
258 } while (__nss_next(&grent_nip, grent_fct_name, &grent_fct.ptr, status, 0) == 0);
261 return NSS_STATUS_NOTFOUND;
266 _nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
267 char *buffer, size_t buflen, int *errnop)
269 enum nss_status status;
270 const struct walk_nss w = {
271 .lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrnam_r",
272 .status = &status, .errnop = errnop
274 const __typeof__(&_nss_nonlocal_getgrnam_r) self = NULL;
276 char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
277 if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
278 return NSS_STATUS_UNAVAIL;
280 #define args (name, grp, buffer, buflen, errnop)
281 #include "walk_nss.h"
283 if (status != NSS_STATUS_SUCCESS)
286 if (strcmp(name, grp->gr_name) != 0) {
287 syslog(LOG_ERR, "nss_nonlocal: discarding group %s from lookup for group %s\n", grp->gr_name, name);
288 return NSS_STATUS_NOTFOUND;
291 return check_nonlocal_group(name, grp, errnop);
295 _nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
296 char *buffer, size_t buflen, int *errnop)
298 enum nss_status status;
299 const struct walk_nss w = {
300 .lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrgid_r",
301 .status = &status, .errnop = errnop
303 const __typeof__(&_nss_nonlocal_getgrgid_r) self = NULL;
305 char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
306 if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
307 return NSS_STATUS_UNAVAIL;
309 #define args (gid, grp, buffer, buflen, errnop)
310 #include "walk_nss.h"
312 if (status != NSS_STATUS_SUCCESS)
315 if (gid != grp->gr_gid) {
316 syslog(LOG_ERR, "nss_nonlocal: discarding gid %d from lookup for gid %d\n", grp->gr_gid, gid);
317 return NSS_STATUS_NOTFOUND;
320 return check_nonlocal_group(grp->gr_name, grp, errnop);
324 add_group(gid_t group, long int *start, long int *size, gid_t **groupsp,
325 long int limit, int *errnop, enum nss_status *status)
327 int i, old_errno = errno;
328 for (i = 0; i < *start; ++i)
329 if ((*groupsp)[i] == group)
331 if (*start + 1 > *size) {
333 long int newsize = 2 * *size;
335 if (*size >= limit) {
336 *status = NSS_STATUS_SUCCESS;
342 newgroups = realloc(*groupsp, newsize * sizeof((*groupsp)[0]));
344 if (newgroups == NULL) {
346 *status = NSS_STATUS_TRYAGAIN;
349 *groupsp = newgroups;
352 (*groupsp)[(*start)++] = group;
357 _nss_nonlocal_initgroups_dyn(const char *user, gid_t group, long int *start,
358 long int *size, gid_t **groupsp, long int limit,
361 enum nss_status status;
362 const struct walk_nss w = {
363 .lookup = &__nss_group_nonlocal_lookup, .fct_name = "initgroups_dyn",
364 .status = &status, .errnop = errnop
366 const __typeof__(&_nss_nonlocal_initgroups_dyn) self = NULL;
368 struct group local_users_group, nonlocal_users_group;
369 bool is_nonlocal = true;
373 /* Check that the user is a nonlocal user, or a member of the
374 * MAGIC_NONLOCAL_GROUPNAME group, before adding any groups. */
375 status = check_nonlocal_user(user, errnop);
376 if (status == NSS_STATUS_TRYAGAIN) {
378 } else if (status != NSS_STATUS_SUCCESS) {
381 status = get_local_group(MAGIC_LOCAL_GROUPNAME,
382 &local_users_group, &buffer, errnop);
383 if (status == NSS_STATUS_SUCCESS) {
385 if (!add_group(local_users_group.gr_gid, start, size, groupsp,
386 limit, errnop, &status))
388 } else if (status == NSS_STATUS_TRYAGAIN) {
392 "nss_nonlocal: Group %s does not exist locally!",
393 MAGIC_LOCAL_GROUPNAME);
397 status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
398 &nonlocal_users_group, &buffer, errnop);
399 if (status == NSS_STATUS_SUCCESS) {
402 if (!add_group(nonlocal_users_group.gr_gid, start, size, groupsp,
403 limit, errnop, &status))
407 for (i = 0; i < *start; ++i) {
408 if ((*groupsp)[i] == nonlocal_users_group.gr_gid) {
417 int nonlocal_errno = *errnop;
418 status = get_nonlocal_passwd(user, &pwbuf, &buf, errnop);
420 if (status == NSS_STATUS_SUCCESS) {
421 nonlocal_errno = *errnop;
422 status = check_nonlocal_gid(user, NULL, pwbuf.pw_gid,
427 if (status == NSS_STATUS_SUCCESS) {
428 if (!add_group(pwbuf.pw_gid, start, size, groupsp, limit,
431 } else if (status == NSS_STATUS_TRYAGAIN) {
432 *errnop = nonlocal_errno;
437 } else if (status == NSS_STATUS_TRYAGAIN) {
441 syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
442 MAGIC_NONLOCAL_GROUPNAME);
446 return NSS_STATUS_SUCCESS;
450 #define args (user, group, start, size, groupsp, limit, errnop)
451 #include "walk_nss.h"
453 if (status != NSS_STATUS_SUCCESS)
456 for (; in < *start; ++in) {
457 int nonlocal_errno = *errnop;
459 for (i = 0; i < out; ++i)
460 if ((*groupsp)[i] == (*groupsp)[in])
465 status = check_nonlocal_gid(user, NULL, (*groupsp)[in],
467 if (status == NSS_STATUS_SUCCESS) {
468 (*groupsp)[out++] = (*groupsp)[in];
469 } else if (status == NSS_STATUS_TRYAGAIN) {
471 *errnop = nonlocal_errno;
477 return NSS_STATUS_SUCCESS;