1/* Copyright (C) 1996-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <ctype.h>
20#include <errno.h>
21#include <fcntl.h>
22#include <netdb.h>
23#include <nss.h>
24#include <nsswitch.h>
25#include <shadow.h>
26#include <stdio_ext.h>
27#include <string.h>
28#include <rpc/types.h>
29#include <rpcsvc/ypclnt.h>
30#include <libc-lock.h>
31#include <kernel-features.h>
32
33#include "netgroup.h"
34
35static service_user *ni;
36static enum nss_status (*nss_setspent) (int stayopen);
37static enum nss_status (*nss_getspnam_r) (const char *name, struct spwd * sp,
38 char *buffer, size_t buflen,
39 int *errnop);
40static enum nss_status (*nss_getspent_r) (struct spwd * sp, char *buffer,
41 size_t buflen, int *errnop);
42static enum nss_status (*nss_endspent) (void);
43
44/* Get the declaration of the parser function. */
45#define ENTNAME spent
46#define STRUCTURE spwd
47#define EXTERN_PARSER
48#include <nss/nss_files/files-parse.c>
49
50/* Structure for remembering -@netgroup and -user members ... */
51#define BLACKLIST_INITIAL_SIZE 512
52#define BLACKLIST_INCREMENT 256
53struct blacklist_t
54{
55 char *data;
56 int current;
57 int size;
58};
59
60struct ent_t
61{
62 bool netgroup;
63 bool files;
64 bool first;
65 enum nss_status setent_status;
66 FILE *stream;
67 struct blacklist_t blacklist;
68 struct spwd pwd;
69 struct __netgrent netgrdata;
70};
71typedef struct ent_t ent_t;
72
73static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL,
74 { NULL, 0, 0},
75 { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
76
77/* Protect global state against multiple changers. */
78__libc_lock_define_initialized (static, lock)
79
80/* Positive if O_CLOEXEC is supported, negative if it is not supported,
81 zero if it is still undecided. This variable is shared with the
82 other compat functions. */
83#ifdef __ASSUME_O_CLOEXEC
84# define __compat_have_cloexec 1
85#else
86# ifdef O_CLOEXEC
87extern int __compat_have_cloexec;
88# else
89# define __compat_have_cloexec -1
90# endif
91#endif
92
93/* Prototypes for local functions. */
94static void blacklist_store_name (const char *, ent_t *);
95static int in_blacklist (const char *, int, ent_t *);
96
97/* Initialize the NSS interface/functions. The calling function must
98 hold the lock. */
99static void
100init_nss_interface (void)
101{
102 if (__nss_database_lookup ("shadow_compat", "passwd_compat",
103 "nis", &ni) >= 0)
104 {
105 nss_setspent = __nss_lookup_function (ni, "setspent");
106 nss_getspnam_r = __nss_lookup_function (ni, "getspnam_r");
107 nss_getspent_r = __nss_lookup_function (ni, "getspent_r");
108 nss_endspent = __nss_lookup_function (ni, "endspent");
109 }
110}
111
112static void
113give_spwd_free (struct spwd *pwd)
114{
115 free (pwd->sp_namp);
116 free (pwd->sp_pwdp);
117
118 memset (pwd, '\0', sizeof (struct spwd));
119 pwd->sp_warn = -1;
120 pwd->sp_inact = -1;
121 pwd->sp_expire = -1;
122 pwd->sp_flag = ~0ul;
123}
124
125static int
126spwd_need_buflen (struct spwd *pwd)
127{
128 int len = 0;
129
130 if (pwd->sp_pwdp != NULL)
131 len += strlen (pwd->sp_pwdp) + 1;
132
133 return len;
134}
135
136static void
137copy_spwd_changes (struct spwd *dest, struct spwd *src,
138 char *buffer, size_t buflen)
139{
140 if (src->sp_pwdp != NULL && strlen (src->sp_pwdp))
141 {
142 if (buffer == NULL)
143 dest->sp_pwdp = strdup (src->sp_pwdp);
144 else if (dest->sp_pwdp &&
145 strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp))
146 strcpy (dest->sp_pwdp, src->sp_pwdp);
147 else
148 {
149 dest->sp_pwdp = buffer;
150 strcpy (dest->sp_pwdp, src->sp_pwdp);
151 buffer += strlen (dest->sp_pwdp) + 1;
152 buflen = buflen - (strlen (dest->sp_pwdp) + 1);
153 }
154 }
155 if (src->sp_lstchg != 0)
156 dest->sp_lstchg = src->sp_lstchg;
157 if (src->sp_min != 0)
158 dest->sp_min = src->sp_min;
159 if (src->sp_max != 0)
160 dest->sp_max = src->sp_max;
161 if (src->sp_warn != -1)
162 dest->sp_warn = src->sp_warn;
163 if (src->sp_inact != -1)
164 dest->sp_inact = src->sp_inact;
165 if (src->sp_expire != -1)
166 dest->sp_expire = src->sp_expire;
167 if (src->sp_flag != ~0ul)
168 dest->sp_flag = src->sp_flag;
169}
170
171static enum nss_status
172internal_setspent (ent_t *ent, int stayopen, int needent)
173{
174 enum nss_status status = NSS_STATUS_SUCCESS;
175
176 ent->first = ent->netgroup = 0;
177 ent->files = true;
178
179 /* If something was left over free it. */
180 if (ent->netgroup)
181 __internal_endnetgrent (&ent->netgrdata);
182
183 if (ent->blacklist.data != NULL)
184 {
185 ent->blacklist.current = 1;
186 ent->blacklist.data[0] = '|';
187 ent->blacklist.data[1] = '\0';
188 }
189 else
190 ent->blacklist.current = 0;
191
192 if (ent->stream == NULL)
193 {
194 ent->stream = fopen ("/etc/shadow", "rme");
195
196 if (ent->stream == NULL)
197 status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
198 else
199 {
200 /* We have to make sure the file is `closed on exec'. */
201 int result = 0;
202
203 if (__compat_have_cloexec <= 0)
204 {
205 int flags;
206 result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD,
207 0);
208 if (result >= 0)
209 {
210#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
211 if (__compat_have_cloexec == 0)
212 __compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;
213
214 if (__compat_have_cloexec < 0)
215#endif
216 {
217 flags |= FD_CLOEXEC;
218 result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
219 flags);
220 }
221 }
222 }
223
224 if (result < 0)
225 {
226 /* Something went wrong. Close the stream and return a
227 failure. */
228 fclose (ent->stream);
229 ent->stream = NULL;
230 status = NSS_STATUS_UNAVAIL;
231 }
232 else
233 /* We take care of locking ourself. */
234 __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
235 }
236 }
237 else
238 rewind (ent->stream);
239
240 give_spwd_free (&ent->pwd);
241
242 if (needent && status == NSS_STATUS_SUCCESS && nss_setspent)
243 ent->setent_status = nss_setspent (stayopen);
244
245 return status;
246}
247
248
249enum nss_status
250_nss_compat_setspent (int stayopen)
251{
252 enum nss_status result;
253
254 __libc_lock_lock (lock);
255
256 if (ni == NULL)
257 init_nss_interface ();
258
259 result = internal_setspent (&ext_ent, stayopen, 1);
260
261 __libc_lock_unlock (lock);
262
263 return result;
264}
265
266
267static enum nss_status
268internal_endspent (ent_t *ent)
269{
270 if (ent->stream != NULL)
271 {
272 fclose (ent->stream);
273 ent->stream = NULL;
274 }
275
276 if (ent->netgroup)
277 __internal_endnetgrent (&ent->netgrdata);
278
279 ent->first = ent->netgroup = false;
280 ent->files = true;
281
282 if (ent->blacklist.data != NULL)
283 {
284 ent->blacklist.current = 1;
285 ent->blacklist.data[0] = '|';
286 ent->blacklist.data[1] = '\0';
287 }
288 else
289 ent->blacklist.current = 0;
290
291 give_spwd_free (&ent->pwd);
292
293 return NSS_STATUS_SUCCESS;
294}
295
296enum nss_status
297_nss_compat_endspent (void)
298{
299 enum nss_status result;
300
301 __libc_lock_lock (lock);
302
303 if (nss_endspent)
304 nss_endspent ();
305
306 result = internal_endspent (&ext_ent);
307
308 __libc_lock_unlock (lock);
309
310 return result;
311}
312
313
314static enum nss_status
315getspent_next_nss_netgr (const char *name, struct spwd *result, ent_t *ent,
316 char *group, char *buffer, size_t buflen,
317 int *errnop)
318{
319 char *curdomain = NULL, *host, *user, *domain, *p2;
320 size_t p2len;
321
322 if (!nss_getspnam_r)
323 return NSS_STATUS_UNAVAIL;
324
325 /* If the setpwent call failed, say so. */
326 if (ent->setent_status != NSS_STATUS_SUCCESS)
327 return ent->setent_status;
328
329 if (ent->first)
330 {
331 memset (&ent->netgrdata, 0, sizeof (struct __netgrent));
332 __internal_setnetgrent (group, &ent->netgrdata);
333 ent->first = false;
334 }
335
336 while (1)
337 {
338 enum nss_status status;
339
340 status = __internal_getnetgrent_r (&host, &user, &domain,
341 &ent->netgrdata, buffer, buflen,
342 errnop);
343 if (status != 1)
344 {
345 __internal_endnetgrent (&ent->netgrdata);
346 ent->netgroup = false;
347 give_spwd_free (&ent->pwd);
348 return NSS_STATUS_RETURN;
349 }
350
351 if (user == NULL || user[0] == '-')
352 continue;
353
354 if (domain != NULL)
355 {
356 if (curdomain == NULL
357 && yp_get_default_domain (&curdomain) != YPERR_SUCCESS)
358 {
359 __internal_endnetgrent (&ent->netgrdata);
360 ent->netgroup = false;
361 give_spwd_free (&ent->pwd);
362 return NSS_STATUS_UNAVAIL;
363 }
364 if (strcmp (curdomain, domain) != 0)
365 continue;
366 }
367
368 /* If name != NULL, we are called from getpwnam */
369 if (name != NULL)
370 if (strcmp (user, name) != 0)
371 continue;
372
373 p2len = spwd_need_buflen (&ent->pwd);
374 if (p2len > buflen)
375 {
376 *errnop = ERANGE;
377 return NSS_STATUS_TRYAGAIN;
378 }
379 p2 = buffer + (buflen - p2len);
380 buflen -= p2len;
381
382 if (nss_getspnam_r (user, result, buffer, buflen, errnop) !=
383 NSS_STATUS_SUCCESS)
384 continue;
385
386 if (!in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
387 {
388 /* Store the User in the blacklist for possible the "+" at the
389 end of /etc/passwd */
390 blacklist_store_name (result->sp_namp, ent);
391 copy_spwd_changes (result, &ent->pwd, p2, p2len);
392 break;
393 }
394 }
395
396 return NSS_STATUS_SUCCESS;
397}
398
399
400static enum nss_status
401getspent_next_nss (struct spwd *result, ent_t *ent,
402 char *buffer, size_t buflen, int *errnop)
403{
404 enum nss_status status;
405 char *p2;
406 size_t p2len;
407
408 if (!nss_getspent_r)
409 return NSS_STATUS_UNAVAIL;
410
411 p2len = spwd_need_buflen (&ent->pwd);
412 if (p2len > buflen)
413 {
414 *errnop = ERANGE;
415 return NSS_STATUS_TRYAGAIN;
416 }
417 p2 = buffer + (buflen - p2len);
418 buflen -= p2len;
419 do
420 {
421 if ((status = nss_getspent_r (result, buffer, buflen, errnop)) !=
422 NSS_STATUS_SUCCESS)
423 return status;
424 }
425 while (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent));
426
427 copy_spwd_changes (result, &ent->pwd, p2, p2len);
428
429 return NSS_STATUS_SUCCESS;
430}
431
432
433/* This function handle the +user entrys in /etc/shadow */
434static enum nss_status
435getspnam_plususer (const char *name, struct spwd *result, ent_t *ent,
436 char *buffer, size_t buflen, int *errnop)
437{
438 if (!nss_getspnam_r)
439 return NSS_STATUS_UNAVAIL;
440
441 struct spwd pwd;
442 memset (&pwd, '\0', sizeof (struct spwd));
443 pwd.sp_warn = -1;
444 pwd.sp_inact = -1;
445 pwd.sp_expire = -1;
446 pwd.sp_flag = ~0ul;
447
448 copy_spwd_changes (&pwd, result, NULL, 0);
449
450 size_t plen = spwd_need_buflen (&pwd);
451 if (plen > buflen)
452 {
453 *errnop = ERANGE;
454 return NSS_STATUS_TRYAGAIN;
455 }
456 char *p = buffer + (buflen - plen);
457 buflen -= plen;
458
459 enum nss_status status = nss_getspnam_r (name, result, buffer, buflen,
460 errnop);
461 if (status != NSS_STATUS_SUCCESS)
462 return status;
463
464 if (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
465 return NSS_STATUS_NOTFOUND;
466
467 copy_spwd_changes (result, &pwd, p, plen);
468 give_spwd_free (&pwd);
469 /* We found the entry. */
470 return NSS_STATUS_SUCCESS;
471}
472
473
474static enum nss_status
475getspent_next_file (struct spwd *result, ent_t *ent,
476 char *buffer, size_t buflen, int *errnop)
477{
478 struct parser_data *data = (void *) buffer;
479 while (1)
480 {
481 fpos_t pos;
482 int parse_res = 0;
483 char *p;
484
485 do
486 {
487 /* We need at least 3 characters for one line. */
488 if (__glibc_unlikely (buflen < 3))
489 {
490 erange:
491 *errnop = ERANGE;
492 return NSS_STATUS_TRYAGAIN;
493 }
494
495 fgetpos (ent->stream, &pos);
496 buffer[buflen - 1] = '\xff';
497 p = fgets_unlocked (buffer, buflen, ent->stream);
498 if (p == NULL && feof_unlocked (ent->stream))
499 return NSS_STATUS_NOTFOUND;
500
501 if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
502 {
503 erange_reset:
504 fsetpos (ent->stream, &pos);
505 goto erange;
506 }
507
508 /* Skip leading blanks. */
509 while (isspace (*p))
510 ++p;
511 }
512 while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
513 /* Parse the line. If it is invalid, loop to
514 get the next line of the file to parse. */
515 || !(parse_res = _nss_files_parse_spent (p, result, data,
516 buflen, errnop)));
517
518 if (__glibc_unlikely (parse_res == -1))
519 /* The parser ran out of space. */
520 goto erange_reset;
521
522 if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
523 /* This is a real entry. */
524 break;
525
526 /* -@netgroup */
527 if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
528 && result->sp_namp[2] != '\0')
529 {
530 /* XXX Do not use fixed length buffers. */
531 char buf2[1024];
532 char *user, *host, *domain;
533 struct __netgrent netgrdata;
534
535 memset (&netgrdata, 0, sizeof (struct __netgrent));
536 __internal_setnetgrent (&result->sp_namp[2], &netgrdata);
537 while (__internal_getnetgrent_r (&host, &user, &domain,
538 &netgrdata, buf2, sizeof (buf2),
539 errnop))
540 {
541 if (user != NULL && user[0] != '-')
542 blacklist_store_name (user, ent);
543 }
544 __internal_endnetgrent (&netgrdata);
545 continue;
546 }
547
548 /* +@netgroup */
549 if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
550 && result->sp_namp[2] != '\0')
551 {
552 int status;
553
554 ent->netgroup = true;
555 ent->first = true;
556 copy_spwd_changes (&ent->pwd, result, NULL, 0);
557
558 status = getspent_next_nss_netgr (NULL, result, ent,
559 &result->sp_namp[2],
560 buffer, buflen, errnop);
561 if (status == NSS_STATUS_RETURN)
562 continue;
563 else
564 return status;
565 }
566
567 /* -user */
568 if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
569 && result->sp_namp[1] != '@')
570 {
571 blacklist_store_name (&result->sp_namp[1], ent);
572 continue;
573 }
574
575 /* +user */
576 if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
577 && result->sp_namp[1] != '@')
578 {
579 size_t len = strlen (result->sp_namp);
580 char buf[len];
581 enum nss_status status;
582
583 /* Store the User in the blacklist for the "+" at the end of
584 /etc/passwd */
585 memcpy (buf, &result->sp_namp[1], len);
586 status = getspnam_plususer (&result->sp_namp[1], result, ent,
587 buffer, buflen, errnop);
588 blacklist_store_name (buf, ent);
589
590 if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
591 break;
592 /* We couldn't parse the entry */
593 else if (status == NSS_STATUS_RETURN
594 /* entry doesn't exist */
595 || status == NSS_STATUS_NOTFOUND)
596 continue;
597 else
598 {
599 if (status == NSS_STATUS_TRYAGAIN)
600 {
601 fsetpos (ent->stream, &pos);
602 *errnop = ERANGE;
603 }
604 return status;
605 }
606 }
607
608 /* +:... */
609 if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
610 {
611 ent->files = false;
612 ent->first = true;
613 copy_spwd_changes (&ent->pwd, result, NULL, 0);
614
615 return getspent_next_nss (result, ent, buffer, buflen, errnop);
616 }
617 }
618
619 return NSS_STATUS_SUCCESS;
620}
621
622
623static enum nss_status
624internal_getspent_r (struct spwd *pw, ent_t *ent,
625 char *buffer, size_t buflen, int *errnop)
626{
627 if (ent->netgroup)
628 {
629 enum nss_status status;
630
631 /* We are searching members in a netgroup */
632 /* Since this is not the first call, we don't need the group name */
633 status = getspent_next_nss_netgr (NULL, pw, ent, NULL, buffer,
634 buflen, errnop);
635
636 if (status == NSS_STATUS_RETURN)
637 return getspent_next_file (pw, ent, buffer, buflen, errnop);
638 else
639 return status;
640 }
641 else if (ent->files)
642 return getspent_next_file (pw, ent, buffer, buflen, errnop);
643 else
644 return getspent_next_nss (pw, ent, buffer, buflen, errnop);
645}
646
647
648enum nss_status
649_nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen,
650 int *errnop)
651{
652 enum nss_status result = NSS_STATUS_SUCCESS;
653
654 __libc_lock_lock (lock);
655
656 /* Be prepared that the setpwent function was not called before. */
657 if (ni == NULL)
658 init_nss_interface ();
659
660 if (ext_ent.stream == NULL)
661 result = internal_setspent (&ext_ent, 1, 1);
662
663 if (result == NSS_STATUS_SUCCESS)
664 result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop);
665
666 __libc_lock_unlock (lock);
667
668 return result;
669}
670
671
672/* Searches in /etc/passwd and the NIS/NIS+ map for a special user */
673static enum nss_status
674internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent,
675 char *buffer, size_t buflen, int *errnop)
676{
677 struct parser_data *data = (void *) buffer;
678
679 while (1)
680 {
681 fpos_t pos;
682 char *p;
683 int parse_res;
684
685 do
686 {
687 /* We need at least 3 characters for one line. */
688 if (__glibc_unlikely (buflen < 3))
689 {
690 erange:
691 *errnop = ERANGE;
692 return NSS_STATUS_TRYAGAIN;
693 }
694
695 fgetpos (ent->stream, &pos);
696 buffer[buflen - 1] = '\xff';
697 p = fgets_unlocked (buffer, buflen, ent->stream);
698 if (p == NULL && feof_unlocked (ent->stream))
699 return NSS_STATUS_NOTFOUND;
700
701 if (p == NULL || buffer[buflen - 1] != '\xff')
702 {
703 erange_reset:
704 fsetpos (ent->stream, &pos);
705 goto erange;
706 }
707
708 /* Terminate the line for any case. */
709 buffer[buflen - 1] = '\0';
710
711 /* Skip leading blanks. */
712 while (isspace (*p))
713 ++p;
714 }
715 while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
716 /* Parse the line. If it is invalid, loop to
717 get the next line of the file to parse. */
718 !(parse_res = _nss_files_parse_spent (p, result, data, buflen,
719 errnop)));
720
721 if (__glibc_unlikely (parse_res == -1))
722 /* The parser ran out of space. */
723 goto erange_reset;
724
725 /* This is a real entry. */
726 if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
727 {
728 if (strcmp (result->sp_namp, name) == 0)
729 return NSS_STATUS_SUCCESS;
730 else
731 continue;
732 }
733
734 /* -@netgroup */
735 /* If the loaded NSS module does not support this service, add
736 all users from a +@netgroup entry to the blacklist, too. */
737 if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
738 && result->sp_namp[2] != '\0')
739 {
740 if (innetgr (&result->sp_namp[2], NULL, name, NULL))
741 return NSS_STATUS_NOTFOUND;
742 continue;
743 }
744
745 /* +@netgroup */
746 if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
747 && result->sp_namp[2] != '\0')
748 {
749 enum nss_status status;
750
751 if (innetgr (&result->sp_namp[2], NULL, name, NULL))
752 {
753 status = getspnam_plususer (name, result, ent, buffer,
754 buflen, errnop);
755
756 if (status == NSS_STATUS_RETURN)
757 continue;
758
759 return status;
760 }
761 continue;
762 }
763
764 /* -user */
765 if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
766 && result->sp_namp[1] != '@')
767 {
768 if (strcmp (&result->sp_namp[1], name) == 0)
769 return NSS_STATUS_NOTFOUND;
770 else
771 continue;
772 }
773
774 /* +user */
775 if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
776 && result->sp_namp[1] != '@')
777 {
778 if (strcmp (name, &result->sp_namp[1]) == 0)
779 {
780 enum nss_status status;
781
782 status = getspnam_plususer (name, result, ent,
783 buffer, buflen, errnop);
784
785 if (status == NSS_STATUS_RETURN)
786 /* We couldn't parse the entry */
787 return NSS_STATUS_NOTFOUND;
788 else
789 return status;
790 }
791 }
792
793 /* +:... */
794 if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
795 {
796 enum nss_status status;
797
798 status = getspnam_plususer (name, result, ent,
799 buffer, buflen, errnop);
800
801 if (status == NSS_STATUS_SUCCESS)
802 /* We found the entry. */
803 break;
804 else if (status == NSS_STATUS_RETURN)
805 /* We couldn't parse the entry */
806 return NSS_STATUS_NOTFOUND;
807 else
808 return status;
809 }
810 }
811 return NSS_STATUS_SUCCESS;
812}
813
814
815enum nss_status
816_nss_compat_getspnam_r (const char *name, struct spwd *pwd,
817 char *buffer, size_t buflen, int *errnop)
818{
819 enum nss_status result;
820 ent_t ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0},
821 { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
822
823 if (name[0] == '-' || name[0] == '+')
824 return NSS_STATUS_NOTFOUND;
825
826 __libc_lock_lock (lock);
827
828 if (ni == NULL)
829 init_nss_interface ();
830
831 __libc_lock_unlock (lock);
832
833 result = internal_setspent (&ent, 0, 0);
834
835 if (result == NSS_STATUS_SUCCESS)
836 result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop);
837
838 internal_endspent (&ent);
839
840 return result;
841}
842
843
844/* Support routines for remembering -@netgroup and -user entries.
845 The names are stored in a single string with `|' as separator. */
846static void
847blacklist_store_name (const char *name, ent_t *ent)
848{
849 int namelen = strlen (name);
850 char *tmp;
851
852 /* first call, setup cache */
853 if (ent->blacklist.size == 0)
854 {
855 ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
856 ent->blacklist.data = malloc (ent->blacklist.size);
857 if (ent->blacklist.data == NULL)
858 return;
859 ent->blacklist.data[0] = '|';
860 ent->blacklist.data[1] = '\0';
861 ent->blacklist.current = 1;
862 }
863 else
864 {
865 if (in_blacklist (name, namelen, ent))
866 return; /* no duplicates */
867
868 if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
869 {
870 ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
871 tmp = realloc (ent->blacklist.data, ent->blacklist.size);
872 if (tmp == NULL)
873 {
874 free (ent->blacklist.data);
875 ent->blacklist.size = 0;
876 return;
877 }
878 ent->blacklist.data = tmp;
879 }
880 }
881
882 tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
883 *tmp++ = '|';
884 *tmp = '\0';
885 ent->blacklist.current += namelen + 1;
886
887 return;
888}
889
890
891/* Returns TRUE if ent->blacklist contains name, else FALSE. */
892static bool_t
893in_blacklist (const char *name, int namelen, ent_t *ent)
894{
895 char buf[namelen + 3];
896 char *cp;
897
898 if (ent->blacklist.data == NULL)
899 return false;
900
901 buf[0] = '|';
902 cp = stpcpy (&buf[1], name);
903 *cp++ = '|';
904 *cp = '\0';
905 return strstr (ent->blacklist.data, buf) != NULL;
906}
907