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04277e02 | 1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
6259ec0d UD |
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 | |
41bdb6e2 AJ |
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. | |
6259ec0d UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
6259ec0d | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
6259ec0d | 18 | |
6259ec0d | 19 | #include <ctype.h> |
1aa43890 | 20 | #include <errno.h> |
3996f34b | 21 | #include <fcntl.h> |
6259ec0d | 22 | #include <netdb.h> |
1aa43890 UD |
23 | #include <nss.h> |
24 | #include <nsswitch.h> | |
6259ec0d | 25 | #include <shadow.h> |
1aa43890 | 26 | #include <stdio_ext.h> |
6259ec0d | 27 | #include <string.h> |
ec999b8e | 28 | #include <libc-lock.h> |
cc783763 | 29 | #include <kernel-features.h> |
26dee9c4 UD |
30 | |
31 | #include "netgroup.h" | |
64d1e08e | 32 | #include "nisdomain.h" |
26dee9c4 | 33 | |
fc9f33e3 | 34 | static service_user *ni; |
1e2e27fd UD |
35 | static enum nss_status (*nss_setspent) (int stayopen); |
36 | static enum nss_status (*nss_getspnam_r) (const char *name, struct spwd * sp, | |
37 | char *buffer, size_t buflen, | |
38 | int *errnop); | |
39 | static enum nss_status (*nss_getspent_r) (struct spwd * sp, char *buffer, | |
40 | size_t buflen, int *errnop); | |
41 | static enum nss_status (*nss_endspent) (void); | |
6259ec0d | 42 | |
7e3be507 UD |
43 | /* Get the declaration of the parser function. */ |
44 | #define ENTNAME spent | |
45 | #define STRUCTURE spwd | |
46 | #define EXTERN_PARSER | |
cc3fa755 | 47 | #include <nss/nss_files/files-parse.c> |
7e3be507 | 48 | |
6259ec0d UD |
49 | /* Structure for remembering -@netgroup and -user members ... */ |
50 | #define BLACKLIST_INITIAL_SIZE 512 | |
51 | #define BLACKLIST_INCREMENT 256 | |
52 | struct blacklist_t | |
1e2e27fd UD |
53 | { |
54 | char *data; | |
55 | int current; | |
56 | int size; | |
57 | }; | |
6259ec0d UD |
58 | |
59 | struct ent_t | |
1e2e27fd | 60 | { |
cb62745a UD |
61 | bool netgroup; |
62 | bool files; | |
63 | bool first; | |
64 | enum nss_status setent_status; | |
1e2e27fd UD |
65 | FILE *stream; |
66 | struct blacklist_t blacklist; | |
67 | struct spwd pwd; | |
68 | struct __netgrent netgrdata; | |
69 | }; | |
6259ec0d UD |
70 | typedef struct ent_t ent_t; |
71 | ||
cb62745a UD |
72 | static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, |
73 | { NULL, 0, 0}, | |
74 | { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}}; | |
6259ec0d UD |
75 | |
76 | /* Protect global state against multiple changers. */ | |
77 | __libc_lock_define_initialized (static, lock) | |
78 | ||
79 | /* Prototypes for local functions. */ | |
80 | static void blacklist_store_name (const char *, ent_t *); | |
64d1e08e | 81 | static bool in_blacklist (const char *, int, ent_t *); |
2d7da676 | 82 | |
1e2e27fd UD |
83 | /* Initialize the NSS interface/functions. The calling function must |
84 | hold the lock. */ | |
85 | static void | |
86 | init_nss_interface (void) | |
87 | { | |
a9368c34 FW |
88 | if (__nss_database_lookup2 ("shadow_compat", "passwd_compat", |
89 | "nis", &ni) >= 0) | |
1e2e27fd UD |
90 | { |
91 | nss_setspent = __nss_lookup_function (ni, "setspent"); | |
92 | nss_getspnam_r = __nss_lookup_function (ni, "getspnam_r"); | |
93 | nss_getspent_r = __nss_lookup_function (ni, "getspent_r"); | |
94 | nss_endspent = __nss_lookup_function (ni, "endspent"); | |
95 | } | |
96 | } | |
97 | ||
6259ec0d UD |
98 | static void |
99 | give_spwd_free (struct spwd *pwd) | |
100 | { | |
72e6cdfa UD |
101 | free (pwd->sp_namp); |
102 | free (pwd->sp_pwdp); | |
6259ec0d UD |
103 | |
104 | memset (pwd, '\0', sizeof (struct spwd)); | |
b378b9f9 UD |
105 | pwd->sp_warn = -1; |
106 | pwd->sp_inact = -1; | |
107 | pwd->sp_expire = -1; | |
108 | pwd->sp_flag = ~0ul; | |
6259ec0d UD |
109 | } |
110 | ||
111 | static int | |
112 | spwd_need_buflen (struct spwd *pwd) | |
113 | { | |
114 | int len = 0; | |
115 | ||
116 | if (pwd->sp_pwdp != NULL) | |
117 | len += strlen (pwd->sp_pwdp) + 1; | |
118 | ||
119 | return len; | |
120 | } | |
121 | ||
122 | static void | |
123 | copy_spwd_changes (struct spwd *dest, struct spwd *src, | |
124 | char *buffer, size_t buflen) | |
125 | { | |
126 | if (src->sp_pwdp != NULL && strlen (src->sp_pwdp)) | |
127 | { | |
128 | if (buffer == NULL) | |
129 | dest->sp_pwdp = strdup (src->sp_pwdp); | |
34a5a146 JM |
130 | else if (dest->sp_pwdp |
131 | && strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp)) | |
6259ec0d UD |
132 | strcpy (dest->sp_pwdp, src->sp_pwdp); |
133 | else | |
134 | { | |
135 | dest->sp_pwdp = buffer; | |
136 | strcpy (dest->sp_pwdp, src->sp_pwdp); | |
137 | buffer += strlen (dest->sp_pwdp) + 1; | |
138 | buflen = buflen - (strlen (dest->sp_pwdp) + 1); | |
139 | } | |
140 | } | |
141 | if (src->sp_lstchg != 0) | |
142 | dest->sp_lstchg = src->sp_lstchg; | |
143 | if (src->sp_min != 0) | |
144 | dest->sp_min = src->sp_min; | |
145 | if (src->sp_max != 0) | |
146 | dest->sp_max = src->sp_max; | |
b378b9f9 | 147 | if (src->sp_warn != -1) |
6259ec0d | 148 | dest->sp_warn = src->sp_warn; |
b378b9f9 | 149 | if (src->sp_inact != -1) |
6259ec0d | 150 | dest->sp_inact = src->sp_inact; |
b378b9f9 | 151 | if (src->sp_expire != -1) |
6259ec0d | 152 | dest->sp_expire = src->sp_expire; |
b378b9f9 | 153 | if (src->sp_flag != ~0ul) |
6259ec0d UD |
154 | dest->sp_flag = src->sp_flag; |
155 | } | |
156 | ||
157 | static enum nss_status | |
b13b96ca | 158 | internal_setspent (ent_t *ent, int stayopen, int needent) |
6259ec0d UD |
159 | { |
160 | enum nss_status status = NSS_STATUS_SUCCESS; | |
161 | ||
1e2e27fd | 162 | ent->first = ent->netgroup = 0; |
cb62745a | 163 | ent->files = true; |
6259ec0d | 164 | |
26dee9c4 UD |
165 | /* If something was left over free it. */ |
166 | if (ent->netgroup) | |
167 | __internal_endnetgrent (&ent->netgrdata); | |
c131718c | 168 | |
6259ec0d | 169 | if (ent->blacklist.data != NULL) |
bd355af0 UD |
170 | { |
171 | ent->blacklist.current = 1; | |
172 | ent->blacklist.data[0] = '|'; | |
173 | ent->blacklist.data[1] = '\0'; | |
174 | } | |
175 | else | |
176 | ent->blacklist.current = 0; | |
6259ec0d UD |
177 | |
178 | if (ent->stream == NULL) | |
179 | { | |
cc783763 | 180 | ent->stream = fopen ("/etc/shadow", "rme"); |
6259ec0d UD |
181 | |
182 | if (ent->stream == NULL) | |
183 | status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL; | |
3996f34b | 184 | else |
cef9b653 FW |
185 | /* We take care of locking ourself. */ |
186 | __fsetlocking (ent->stream, FSETLOCKING_BYCALLER); | |
6259ec0d UD |
187 | } |
188 | else | |
189 | rewind (ent->stream); | |
190 | ||
191 | give_spwd_free (&ent->pwd); | |
192 | ||
b13b96ca | 193 | if (needent && status == NSS_STATUS_SUCCESS && nss_setspent) |
cb62745a | 194 | ent->setent_status = nss_setspent (stayopen); |
1e2e27fd | 195 | |
6259ec0d UD |
196 | return status; |
197 | } | |
198 | ||
199 | ||
200 | enum nss_status | |
51eecc4a | 201 | _nss_compat_setspent (int stayopen) |
6259ec0d UD |
202 | { |
203 | enum nss_status result; | |
204 | ||
205 | __libc_lock_lock (lock); | |
206 | ||
26dee9c4 | 207 | if (ni == NULL) |
1e2e27fd | 208 | init_nss_interface (); |
c131718c | 209 | |
b13b96ca | 210 | result = internal_setspent (&ext_ent, stayopen, 1); |
6259ec0d UD |
211 | |
212 | __libc_lock_unlock (lock); | |
213 | ||
214 | return result; | |
215 | } | |
216 | ||
217 | ||
218 | static enum nss_status | |
219 | internal_endspent (ent_t *ent) | |
220 | { | |
221 | if (ent->stream != NULL) | |
222 | { | |
223 | fclose (ent->stream); | |
224 | ent->stream = NULL; | |
225 | } | |
226 | ||
26dee9c4 UD |
227 | if (ent->netgroup) |
228 | __internal_endnetgrent (&ent->netgrdata); | |
229 | ||
cb62745a UD |
230 | ent->first = ent->netgroup = false; |
231 | ent->files = true; | |
c131718c | 232 | |
6259ec0d | 233 | if (ent->blacklist.data != NULL) |
bd355af0 UD |
234 | { |
235 | ent->blacklist.current = 1; | |
236 | ent->blacklist.data[0] = '|'; | |
237 | ent->blacklist.data[1] = '\0'; | |
238 | } | |
239 | else | |
240 | ent->blacklist.current = 0; | |
c131718c | 241 | |
6259ec0d UD |
242 | give_spwd_free (&ent->pwd); |
243 | ||
244 | return NSS_STATUS_SUCCESS; | |
245 | } | |
246 | ||
247 | enum nss_status | |
248 | _nss_compat_endspent (void) | |
249 | { | |
250 | enum nss_status result; | |
251 | ||
252 | __libc_lock_lock (lock); | |
253 | ||
b13b96ca AS |
254 | if (nss_endspent) |
255 | nss_endspent (); | |
256 | ||
6259ec0d UD |
257 | result = internal_endspent (&ext_ent); |
258 | ||
259 | __libc_lock_unlock (lock); | |
260 | ||
261 | return result; | |
262 | } | |
263 | ||
264 | ||
265 | static enum nss_status | |
1e2e27fd UD |
266 | getspent_next_nss_netgr (const char *name, struct spwd *result, ent_t *ent, |
267 | char *group, char *buffer, size_t buflen, | |
268 | int *errnop) | |
6259ec0d | 269 | { |
6d4d8e8e | 270 | char *curdomain = NULL, *host, *user, *domain, *p2; |
6259ec0d UD |
271 | size_t p2len; |
272 | ||
1e2e27fd UD |
273 | if (!nss_getspnam_r) |
274 | return NSS_STATUS_UNAVAIL; | |
275 | ||
cb62745a UD |
276 | /* If the setpwent call failed, say so. */ |
277 | if (ent->setent_status != NSS_STATUS_SUCCESS) | |
278 | return ent->setent_status; | |
279 | ||
6d4d8e8e | 280 | if (ent->first) |
6259ec0d | 281 | { |
1e2e27fd | 282 | memset (&ent->netgrdata, 0, sizeof (struct __netgrent)); |
26dee9c4 | 283 | __internal_setnetgrent (group, &ent->netgrdata); |
cb62745a | 284 | ent->first = false; |
6259ec0d UD |
285 | } |
286 | ||
287 | while (1) | |
288 | { | |
1e2e27fd | 289 | enum nss_status status; |
60c96635 | 290 | |
26dee9c4 | 291 | status = __internal_getnetgrent_r (&host, &user, &domain, |
d71b808a UD |
292 | &ent->netgrdata, buffer, buflen, |
293 | errnop); | |
26dee9c4 | 294 | if (status != 1) |
6259ec0d | 295 | { |
26dee9c4 | 296 | __internal_endnetgrent (&ent->netgrdata); |
cb62745a | 297 | ent->netgroup = false; |
6259ec0d UD |
298 | give_spwd_free (&ent->pwd); |
299 | return NSS_STATUS_RETURN; | |
300 | } | |
3996f34b | 301 | |
6259ec0d UD |
302 | if (user == NULL || user[0] == '-') |
303 | continue; | |
3996f34b | 304 | |
6d4d8e8e AS |
305 | if (domain != NULL) |
306 | { | |
307 | if (curdomain == NULL | |
64d1e08e | 308 | && __nss_get_default_domain (&curdomain) != 0) |
6d4d8e8e AS |
309 | { |
310 | __internal_endnetgrent (&ent->netgrdata); | |
311 | ent->netgroup = false; | |
312 | give_spwd_free (&ent->pwd); | |
313 | return NSS_STATUS_UNAVAIL; | |
314 | } | |
315 | if (strcmp (curdomain, domain) != 0) | |
316 | continue; | |
317 | } | |
6259ec0d | 318 | |
cc3fa755 UD |
319 | /* If name != NULL, we are called from getpwnam */ |
320 | if (name != NULL) | |
321 | if (strcmp (user, name) != 0) | |
322 | continue; | |
323 | ||
6259ec0d UD |
324 | p2len = spwd_need_buflen (&ent->pwd); |
325 | if (p2len > buflen) | |
326 | { | |
d71b808a | 327 | *errnop = ERANGE; |
6259ec0d UD |
328 | return NSS_STATUS_TRYAGAIN; |
329 | } | |
330 | p2 = buffer + (buflen - p2len); | |
331 | buflen -= p2len; | |
26dee9c4 | 332 | |
a04549c1 JM |
333 | if (nss_getspnam_r (user, result, buffer, buflen, errnop) |
334 | != NSS_STATUS_SUCCESS) | |
1e2e27fd | 335 | continue; |
cc3fa755 | 336 | |
1e2e27fd | 337 | if (!in_blacklist (result->sp_namp, strlen (result->sp_namp), ent)) |
60c96635 | 338 | { |
1e2e27fd UD |
339 | /* Store the User in the blacklist for possible the "+" at the |
340 | end of /etc/passwd */ | |
cc3fa755 UD |
341 | blacklist_store_name (result->sp_namp, ent); |
342 | copy_spwd_changes (result, &ent->pwd, p2, p2len); | |
1e2e27fd | 343 | break; |
60c96635 | 344 | } |
26dee9c4 | 345 | } |
c131718c | 346 | |
26dee9c4 UD |
347 | return NSS_STATUS_SUCCESS; |
348 | } | |
349 | ||
350 | ||
6259ec0d | 351 | static enum nss_status |
1e2e27fd | 352 | getspent_next_nss (struct spwd *result, ent_t *ent, |
d71b808a | 353 | char *buffer, size_t buflen, int *errnop) |
6259ec0d | 354 | { |
1e2e27fd UD |
355 | enum nss_status status; |
356 | char *p2; | |
6259ec0d UD |
357 | size_t p2len; |
358 | ||
1e2e27fd UD |
359 | if (!nss_getspent_r) |
360 | return NSS_STATUS_UNAVAIL; | |
6259ec0d UD |
361 | |
362 | p2len = spwd_need_buflen (&ent->pwd); | |
363 | if (p2len > buflen) | |
364 | { | |
d71b808a | 365 | *errnop = ERANGE; |
6259ec0d UD |
366 | return NSS_STATUS_TRYAGAIN; |
367 | } | |
368 | p2 = buffer + (buflen - p2len); | |
369 | buflen -= p2len; | |
370 | do | |
371 | { | |
a04549c1 JM |
372 | if ((status = nss_getspent_r (result, buffer, buflen, errnop)) |
373 | != NSS_STATUS_SUCCESS) | |
1e2e27fd | 374 | return status; |
6259ec0d | 375 | } |
1e2e27fd | 376 | while (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent)); |
6259ec0d UD |
377 | |
378 | copy_spwd_changes (result, &ent->pwd, p2, p2len); | |
379 | ||
26dee9c4 | 380 | return NSS_STATUS_SUCCESS; |
6259ec0d UD |
381 | } |
382 | ||
cb62745a | 383 | |
26dee9c4 UD |
384 | /* This function handle the +user entrys in /etc/shadow */ |
385 | static enum nss_status | |
1e2e27fd UD |
386 | getspnam_plususer (const char *name, struct spwd *result, ent_t *ent, |
387 | char *buffer, size_t buflen, int *errnop) | |
26dee9c4 | 388 | { |
1e2e27fd UD |
389 | if (!nss_getspnam_r) |
390 | return NSS_STATUS_UNAVAIL; | |
391 | ||
016c70ea | 392 | struct spwd pwd; |
26dee9c4 | 393 | memset (&pwd, '\0', sizeof (struct spwd)); |
b378b9f9 UD |
394 | pwd.sp_warn = -1; |
395 | pwd.sp_inact = -1; | |
396 | pwd.sp_expire = -1; | |
397 | pwd.sp_flag = ~0ul; | |
c131718c | 398 | |
26dee9c4 | 399 | copy_spwd_changes (&pwd, result, NULL, 0); |
c131718c | 400 | |
016c70ea | 401 | size_t plen = spwd_need_buflen (&pwd); |
26dee9c4 UD |
402 | if (plen > buflen) |
403 | { | |
d71b808a | 404 | *errnop = ERANGE; |
26dee9c4 UD |
405 | return NSS_STATUS_TRYAGAIN; |
406 | } | |
016c70ea | 407 | char *p = buffer + (buflen - plen); |
26dee9c4 | 408 | buflen -= plen; |
c131718c | 409 | |
016c70ea UD |
410 | enum nss_status status = nss_getspnam_r (name, result, buffer, buflen, |
411 | errnop); | |
412 | if (status != NSS_STATUS_SUCCESS) | |
413 | return status; | |
6591c335 | 414 | |
1e2e27fd UD |
415 | if (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent)) |
416 | return NSS_STATUS_NOTFOUND; | |
c131718c | 417 | |
1e2e27fd UD |
418 | copy_spwd_changes (result, &pwd, p, plen); |
419 | give_spwd_free (&pwd); | |
420 | /* We found the entry. */ | |
c503d3dc | 421 | return NSS_STATUS_SUCCESS; |
26dee9c4 | 422 | } |
6259ec0d | 423 | |
cb62745a | 424 | |
6259ec0d UD |
425 | static enum nss_status |
426 | getspent_next_file (struct spwd *result, ent_t *ent, | |
d71b808a | 427 | char *buffer, size_t buflen, int *errnop) |
6259ec0d | 428 | { |
7e3be507 | 429 | struct parser_data *data = (void *) buffer; |
6259ec0d UD |
430 | while (1) |
431 | { | |
60c96635 UD |
432 | fpos_t pos; |
433 | int parse_res = 0; | |
c131718c | 434 | char *p; |
6259ec0d UD |
435 | |
436 | do | |
437 | { | |
20f8e666 | 438 | /* We need at least 3 characters for one line. */ |
a1ffb40e | 439 | if (__glibc_unlikely (buflen < 3)) |
20f8e666 UD |
440 | { |
441 | erange: | |
442 | *errnop = ERANGE; | |
443 | return NSS_STATUS_TRYAGAIN; | |
444 | } | |
445 | ||
60c96635 | 446 | fgetpos (ent->stream, &pos); |
af69217f | 447 | buffer[buflen - 1] = '\xff'; |
1aa43890 UD |
448 | p = fgets_unlocked (buffer, buflen, ent->stream); |
449 | if (p == NULL && feof_unlocked (ent->stream)) | |
34816665 UD |
450 | return NSS_STATUS_NOTFOUND; |
451 | ||
20f8e666 | 452 | if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0)) |
af69217f | 453 | { |
20f8e666 | 454 | erange_reset: |
af69217f | 455 | fsetpos (ent->stream, &pos); |
20f8e666 | 456 | goto erange; |
af69217f | 457 | } |
6259ec0d UD |
458 | |
459 | /* Skip leading blanks. */ | |
460 | while (isspace (*p)) | |
461 | ++p; | |
462 | } | |
c131718c | 463 | while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ |
1e2e27fd UD |
464 | /* Parse the line. If it is invalid, loop to |
465 | get the next line of the file to parse. */ | |
60c96635 | 466 | || !(parse_res = _nss_files_parse_spent (p, result, data, |
d71b808a | 467 | buflen, errnop))); |
6259ec0d | 468 | |
a1ffb40e | 469 | if (__glibc_unlikely (parse_res == -1)) |
20f8e666 UD |
470 | /* The parser ran out of space. */ |
471 | goto erange_reset; | |
3996f34b | 472 | |
6259ec0d UD |
473 | if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-') |
474 | /* This is a real entry. */ | |
475 | break; | |
476 | ||
477 | /* -@netgroup */ | |
478 | if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@' | |
479 | && result->sp_namp[2] != '\0') | |
480 | { | |
d71b808a | 481 | /* XXX Do not use fixed length buffers. */ |
1e2e27fd | 482 | char buf2[1024]; |
51eecc4a | 483 | char *user, *host, *domain; |
1e2e27fd | 484 | struct __netgrent netgrdata; |
c131718c | 485 | |
1c6e6f23 | 486 | memset (&netgrdata, 0, sizeof (struct __netgrent)); |
1e2e27fd | 487 | __internal_setnetgrent (&result->sp_namp[2], &netgrdata); |
c131718c | 488 | while (__internal_getnetgrent_r (&host, &user, &domain, |
d71b808a UD |
489 | &netgrdata, buf2, sizeof (buf2), |
490 | errnop)) | |
6259ec0d UD |
491 | { |
492 | if (user != NULL && user[0] != '-') | |
493 | blacklist_store_name (user, ent); | |
494 | } | |
c131718c | 495 | __internal_endnetgrent (&netgrdata); |
6259ec0d UD |
496 | continue; |
497 | } | |
498 | ||
499 | /* +@netgroup */ | |
500 | if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@' | |
501 | && result->sp_namp[2] != '\0') | |
502 | { | |
503 | int status; | |
504 | ||
cb62745a UD |
505 | ent->netgroup = true; |
506 | ent->first = true; | |
6259ec0d UD |
507 | copy_spwd_changes (&ent->pwd, result, NULL, 0); |
508 | ||
1e2e27fd UD |
509 | status = getspent_next_nss_netgr (NULL, result, ent, |
510 | &result->sp_namp[2], | |
511 | buffer, buflen, errnop); | |
6259ec0d UD |
512 | if (status == NSS_STATUS_RETURN) |
513 | continue; | |
514 | else | |
515 | return status; | |
516 | } | |
517 | ||
518 | /* -user */ | |
519 | if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0' | |
520 | && result->sp_namp[1] != '@') | |
521 | { | |
522 | blacklist_store_name (&result->sp_namp[1], ent); | |
523 | continue; | |
524 | } | |
525 | ||
526 | /* +user */ | |
527 | if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0' | |
528 | && result->sp_namp[1] != '@') | |
529 | { | |
c503d3dc UD |
530 | size_t len = strlen (result->sp_namp); |
531 | char buf[len]; | |
1e2e27fd | 532 | enum nss_status status; |
c131718c | 533 | |
cc3fa755 UD |
534 | /* Store the User in the blacklist for the "+" at the end of |
535 | /etc/passwd */ | |
c503d3dc | 536 | memcpy (buf, &result->sp_namp[1], len); |
1e2e27fd UD |
537 | status = getspnam_plususer (&result->sp_namp[1], result, ent, |
538 | buffer, buflen, errnop); | |
c503d3dc | 539 | blacklist_store_name (buf, ent); |
1e2e27fd UD |
540 | |
541 | if (status == NSS_STATUS_SUCCESS) /* We found the entry. */ | |
542 | break; | |
c503d3dc UD |
543 | /* We couldn't parse the entry */ |
544 | else if (status == NSS_STATUS_RETURN | |
545 | /* entry doesn't exist */ | |
546 | || status == NSS_STATUS_NOTFOUND) | |
1e2e27fd UD |
547 | continue; |
548 | else | |
549 | { | |
550 | if (status == NSS_STATUS_TRYAGAIN) | |
551 | { | |
552 | fsetpos (ent->stream, &pos); | |
553 | *errnop = ERANGE; | |
554 | } | |
555 | return status; | |
556 | } | |
6259ec0d UD |
557 | } |
558 | ||
559 | /* +:... */ | |
560 | if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0') | |
561 | { | |
cb62745a UD |
562 | ent->files = false; |
563 | ent->first = true; | |
6259ec0d UD |
564 | copy_spwd_changes (&ent->pwd, result, NULL, 0); |
565 | ||
1e2e27fd | 566 | return getspent_next_nss (result, ent, buffer, buflen, errnop); |
6259ec0d UD |
567 | } |
568 | } | |
569 | ||
570 | return NSS_STATUS_SUCCESS; | |
571 | } | |
572 | ||
573 | ||
574 | static enum nss_status | |
575 | internal_getspent_r (struct spwd *pw, ent_t *ent, | |
d71b808a | 576 | char *buffer, size_t buflen, int *errnop) |
6259ec0d UD |
577 | { |
578 | if (ent->netgroup) | |
579 | { | |
1e2e27fd | 580 | enum nss_status status; |
6259ec0d UD |
581 | |
582 | /* We are searching members in a netgroup */ | |
583 | /* Since this is not the first call, we don't need the group name */ | |
1e2e27fd UD |
584 | status = getspent_next_nss_netgr (NULL, pw, ent, NULL, buffer, |
585 | buflen, errnop); | |
586 | ||
6259ec0d | 587 | if (status == NSS_STATUS_RETURN) |
d71b808a | 588 | return getspent_next_file (pw, ent, buffer, buflen, errnop); |
6259ec0d UD |
589 | else |
590 | return status; | |
591 | } | |
1e2e27fd UD |
592 | else if (ent->files) |
593 | return getspent_next_file (pw, ent, buffer, buflen, errnop); | |
6259ec0d | 594 | else |
1e2e27fd | 595 | return getspent_next_nss (pw, ent, buffer, buflen, errnop); |
6259ec0d UD |
596 | } |
597 | ||
cb62745a | 598 | |
6259ec0d | 599 | enum nss_status |
d71b808a UD |
600 | _nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen, |
601 | int *errnop) | |
6259ec0d | 602 | { |
1e2e27fd | 603 | enum nss_status result = NSS_STATUS_SUCCESS; |
6259ec0d UD |
604 | |
605 | __libc_lock_lock (lock); | |
606 | ||
1e2e27fd | 607 | /* Be prepared that the setpwent function was not called before. */ |
26dee9c4 | 608 | if (ni == NULL) |
1e2e27fd | 609 | init_nss_interface (); |
c131718c | 610 | |
6259ec0d | 611 | if (ext_ent.stream == NULL) |
b13b96ca | 612 | result = internal_setspent (&ext_ent, 1, 1); |
6259ec0d | 613 | |
1e2e27fd UD |
614 | if (result == NSS_STATUS_SUCCESS) |
615 | result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop); | |
6259ec0d UD |
616 | |
617 | __libc_lock_unlock (lock); | |
618 | ||
1e2e27fd | 619 | return result; |
6259ec0d UD |
620 | } |
621 | ||
cb62745a | 622 | |
cc3fa755 UD |
623 | /* Searches in /etc/passwd and the NIS/NIS+ map for a special user */ |
624 | static enum nss_status | |
625 | internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent, | |
d71b808a | 626 | char *buffer, size_t buflen, int *errnop) |
cc3fa755 UD |
627 | { |
628 | struct parser_data *data = (void *) buffer; | |
629 | ||
630 | while (1) | |
631 | { | |
632 | fpos_t pos; | |
633 | char *p; | |
634 | int parse_res; | |
635 | ||
636 | do | |
637 | { | |
20f8e666 | 638 | /* We need at least 3 characters for one line. */ |
a1ffb40e | 639 | if (__glibc_unlikely (buflen < 3)) |
20f8e666 UD |
640 | { |
641 | erange: | |
642 | *errnop = ERANGE; | |
643 | return NSS_STATUS_TRYAGAIN; | |
644 | } | |
645 | ||
cc3fa755 | 646 | fgetpos (ent->stream, &pos); |
af69217f | 647 | buffer[buflen - 1] = '\xff'; |
1aa43890 UD |
648 | p = fgets_unlocked (buffer, buflen, ent->stream); |
649 | if (p == NULL && feof_unlocked (ent->stream)) | |
34816665 UD |
650 | return NSS_STATUS_NOTFOUND; |
651 | ||
af69217f UD |
652 | if (p == NULL || buffer[buflen - 1] != '\xff') |
653 | { | |
20f8e666 | 654 | erange_reset: |
af69217f | 655 | fsetpos (ent->stream, &pos); |
20f8e666 | 656 | goto erange; |
af69217f | 657 | } |
cc3fa755 | 658 | |
c503d3dc UD |
659 | /* Terminate the line for any case. */ |
660 | buffer[buflen - 1] = '\0'; | |
661 | ||
cc3fa755 UD |
662 | /* Skip leading blanks. */ |
663 | while (isspace (*p)) | |
664 | ++p; | |
665 | } | |
a04549c1 | 666 | while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ |
cc3fa755 | 667 | /* Parse the line. If it is invalid, loop to |
1e2e27fd | 668 | get the next line of the file to parse. */ |
a04549c1 JM |
669 | || !(parse_res = _nss_files_parse_spent (p, result, data, buflen, |
670 | errnop))); | |
cc3fa755 | 671 | |
a1ffb40e | 672 | if (__glibc_unlikely (parse_res == -1)) |
20f8e666 UD |
673 | /* The parser ran out of space. */ |
674 | goto erange_reset; | |
cc3fa755 UD |
675 | |
676 | /* This is a real entry. */ | |
677 | if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-') | |
678 | { | |
679 | if (strcmp (result->sp_namp, name) == 0) | |
680 | return NSS_STATUS_SUCCESS; | |
681 | else | |
682 | continue; | |
683 | } | |
684 | ||
685 | /* -@netgroup */ | |
1e2e27fd UD |
686 | /* If the loaded NSS module does not support this service, add |
687 | all users from a +@netgroup entry to the blacklist, too. */ | |
cc3fa755 UD |
688 | if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@' |
689 | && result->sp_namp[2] != '\0') | |
690 | { | |
c503d3dc UD |
691 | if (innetgr (&result->sp_namp[2], NULL, name, NULL)) |
692 | return NSS_STATUS_NOTFOUND; | |
cc3fa755 UD |
693 | continue; |
694 | } | |
695 | ||
696 | /* +@netgroup */ | |
697 | if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@' | |
698 | && result->sp_namp[2] != '\0') | |
699 | { | |
c503d3dc | 700 | enum nss_status status; |
cc3fa755 | 701 | |
c503d3dc | 702 | if (innetgr (&result->sp_namp[2], NULL, name, NULL)) |
cc3fa755 | 703 | { |
c503d3dc UD |
704 | status = getspnam_plususer (name, result, ent, buffer, |
705 | buflen, errnop); | |
706 | ||
cc3fa755 UD |
707 | if (status == NSS_STATUS_RETURN) |
708 | continue; | |
709 | ||
c503d3dc | 710 | return status; |
1e2e27fd | 711 | } |
cc3fa755 UD |
712 | continue; |
713 | } | |
714 | ||
715 | /* -user */ | |
716 | if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0' | |
717 | && result->sp_namp[1] != '@') | |
718 | { | |
719 | if (strcmp (&result->sp_namp[1], name) == 0) | |
34816665 | 720 | return NSS_STATUS_NOTFOUND; |
cc3fa755 UD |
721 | else |
722 | continue; | |
723 | } | |
724 | ||
725 | /* +user */ | |
726 | if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0' | |
727 | && result->sp_namp[1] != '@') | |
728 | { | |
729 | if (strcmp (name, &result->sp_namp[1]) == 0) | |
730 | { | |
731 | enum nss_status status; | |
732 | ||
1e2e27fd UD |
733 | status = getspnam_plususer (name, result, ent, |
734 | buffer, buflen, errnop); | |
735 | ||
cc3fa755 | 736 | if (status == NSS_STATUS_RETURN) |
34816665 UD |
737 | /* We couldn't parse the entry */ |
738 | return NSS_STATUS_NOTFOUND; | |
cc3fa755 UD |
739 | else |
740 | return status; | |
741 | } | |
742 | } | |
743 | ||
744 | /* +:... */ | |
745 | if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0') | |
746 | { | |
747 | enum nss_status status; | |
748 | ||
1e2e27fd UD |
749 | status = getspnam_plususer (name, result, ent, |
750 | buffer, buflen, errnop); | |
751 | ||
c503d3dc UD |
752 | if (status == NSS_STATUS_SUCCESS) |
753 | /* We found the entry. */ | |
754 | break; | |
755 | else if (status == NSS_STATUS_RETURN) | |
756 | /* We couldn't parse the entry */ | |
757 | return NSS_STATUS_NOTFOUND; | |
cc3fa755 UD |
758 | else |
759 | return status; | |
760 | } | |
761 | } | |
762 | return NSS_STATUS_SUCCESS; | |
763 | } | |
6259ec0d | 764 | |
cb62745a | 765 | |
6259ec0d UD |
766 | enum nss_status |
767 | _nss_compat_getspnam_r (const char *name, struct spwd *pwd, | |
d71b808a | 768 | char *buffer, size_t buflen, int *errnop) |
6259ec0d | 769 | { |
1e2e27fd | 770 | enum nss_status result; |
cb62745a UD |
771 | ent_t ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0}, |
772 | { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}}; | |
6259ec0d UD |
773 | |
774 | if (name[0] == '-' || name[0] == '+') | |
34816665 | 775 | return NSS_STATUS_NOTFOUND; |
6259ec0d | 776 | |
1e2e27fd UD |
777 | __libc_lock_lock (lock); |
778 | ||
26dee9c4 | 779 | if (ni == NULL) |
1e2e27fd UD |
780 | init_nss_interface (); |
781 | ||
782 | __libc_lock_unlock (lock); | |
c131718c | 783 | |
b13b96ca | 784 | result = internal_setspent (&ent, 0, 0); |
6259ec0d | 785 | |
c503d3dc UD |
786 | if (result == NSS_STATUS_SUCCESS) |
787 | result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop); | |
6259ec0d UD |
788 | |
789 | internal_endspent (&ent); | |
cc3fa755 | 790 | |
1e2e27fd | 791 | return result; |
6259ec0d UD |
792 | } |
793 | ||
cb62745a | 794 | |
6259ec0d UD |
795 | /* Support routines for remembering -@netgroup and -user entries. |
796 | The names are stored in a single string with `|' as separator. */ | |
797 | static void | |
798 | blacklist_store_name (const char *name, ent_t *ent) | |
799 | { | |
800 | int namelen = strlen (name); | |
801 | char *tmp; | |
802 | ||
803 | /* first call, setup cache */ | |
804 | if (ent->blacklist.size == 0) | |
805 | { | |
806 | ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen); | |
807 | ent->blacklist.data = malloc (ent->blacklist.size); | |
808 | if (ent->blacklist.data == NULL) | |
809 | return; | |
810 | ent->blacklist.data[0] = '|'; | |
811 | ent->blacklist.data[1] = '\0'; | |
812 | ent->blacklist.current = 1; | |
813 | } | |
814 | else | |
815 | { | |
816 | if (in_blacklist (name, namelen, ent)) | |
817 | return; /* no duplicates */ | |
818 | ||
819 | if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size) | |
820 | { | |
821 | ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen); | |
822 | tmp = realloc (ent->blacklist.data, ent->blacklist.size); | |
823 | if (tmp == NULL) | |
824 | { | |
825 | free (ent->blacklist.data); | |
826 | ent->blacklist.size = 0; | |
827 | return; | |
828 | } | |
829 | ent->blacklist.data = tmp; | |
830 | } | |
831 | } | |
832 | ||
833 | tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name); | |
834 | *tmp++ = '|'; | |
835 | *tmp = '\0'; | |
836 | ent->blacklist.current += namelen + 1; | |
837 | ||
838 | return; | |
839 | } | |
840 | ||
cb62745a | 841 | |
64d1e08e AS |
842 | /* Returns whether ent->blacklist contains name. */ |
843 | static bool | |
6259ec0d UD |
844 | in_blacklist (const char *name, int namelen, ent_t *ent) |
845 | { | |
846 | char buf[namelen + 3]; | |
c131718c | 847 | char *cp; |
6259ec0d UD |
848 | |
849 | if (ent->blacklist.data == NULL) | |
cb62745a | 850 | return false; |
6259ec0d | 851 | |
c131718c UD |
852 | buf[0] = '|'; |
853 | cp = stpcpy (&buf[1], name); | |
1e2e27fd | 854 | *cp++ = '|'; |
c131718c | 855 | *cp = '\0'; |
6259ec0d UD |
856 | return strstr (ent->blacklist.data, buf) != NULL; |
857 | } |