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Commit | Line | Data |
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67479a70 | 1 | /* Inner loops of cache daemon. |
482bbeb9 | 2 | Copyright (C) 1998-2003, 2004 Free Software Foundation, Inc. |
d67281a7 | 3 | This file is part of the GNU C Library. |
67479a70 | 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
d67281a7 UD |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
d67281a7 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
d67281a7 | 15 | |
41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
d67281a7 | 20 | |
4401d759 | 21 | #include <alloca.h> |
67479a70 | 22 | #include <assert.h> |
0fdb4f42 | 23 | #include <atomic.h> |
d67281a7 | 24 | #include <error.h> |
67479a70 | 25 | #include <errno.h> |
d6db0975 | 26 | #include <fcntl.h> |
057685e4 | 27 | #include <grp.h> |
a95a08b4 | 28 | #include <libintl.h> |
d67281a7 | 29 | #include <pthread.h> |
057685e4 | 30 | #include <pwd.h> |
482bbeb9 | 31 | #include <resolv.h> |
057685e4 | 32 | #include <stdio.h> |
d67281a7 UD |
33 | #include <stdlib.h> |
34 | #include <unistd.h> | |
8d8c6efa | 35 | #include <arpa/inet.h> |
fc03df7a UD |
36 | #ifdef HAVE_EPOLL |
37 | # include <sys/epoll.h> | |
38 | #endif | |
a95a08b4 | 39 | #include <sys/mman.h> |
67479a70 | 40 | #include <sys/param.h> |
a53bad16 | 41 | #include <sys/poll.h> |
d67281a7 UD |
42 | #include <sys/socket.h> |
43 | #include <sys/stat.h> | |
d67281a7 UD |
44 | #include <sys/un.h> |
45 | ||
46 | #include "nscd.h" | |
47 | #include "dbg_log.h" | |
74a30a58 | 48 | #include "selinux.h" |
d67281a7 | 49 | |
a95a08b4 UD |
50 | |
51 | /* Number of bytes of data we initially reserve for each hash table bucket. */ | |
52 | #define DEFAULT_DATASIZE_PER_BUCKET 1024 | |
53 | ||
54 | ||
057685e4 UD |
55 | /* Wrapper functions with error checking for standard functions. */ |
56 | extern void *xmalloc (size_t n); | |
57 | extern void *xcalloc (size_t n, size_t s); | |
58 | extern void *xrealloc (void *o, size_t n); | |
59 | ||
60 | /* Support to run nscd as an unprivileged user */ | |
61 | const char *server_user; | |
62 | static uid_t server_uid; | |
63 | static gid_t server_gid; | |
a12ce44f UD |
64 | const char *stat_user; |
65 | uid_t stat_uid; | |
057685e4 UD |
66 | static gid_t *server_groups; |
67 | #ifndef NGROUPS | |
68 | # define NGROUPS 32 | |
69 | #endif | |
a95a08b4 | 70 | static int server_ngroups; |
057685e4 | 71 | |
27e82856 UD |
72 | static pthread_attr_t attr; |
73 | ||
057685e4 UD |
74 | static void begin_drop_privileges (void); |
75 | static void finish_drop_privileges (void); | |
76 | ||
67479a70 UD |
77 | /* Map request type to a string. */ |
78 | const char *serv2str[LASTREQ] = | |
d67281a7 | 79 | { |
67479a70 UD |
80 | [GETPWBYNAME] = "GETPWBYNAME", |
81 | [GETPWBYUID] = "GETPWBYUID", | |
82 | [GETGRBYNAME] = "GETGRBYNAME", | |
83 | [GETGRBYGID] = "GETGRBYGID", | |
84 | [GETHOSTBYNAME] = "GETHOSTBYNAME", | |
85 | [GETHOSTBYNAMEv6] = "GETHOSTBYNAMEv6", | |
86 | [GETHOSTBYADDR] = "GETHOSTBYADDR", | |
87 | [GETHOSTBYADDRv6] = "GETHOSTBYADDRv6", | |
88 | [SHUTDOWN] = "SHUTDOWN", | |
756409c4 | 89 | [GETSTAT] = "GETSTAT", |
c207f23b UD |
90 | [INVALIDATE] = "INVALIDATE", |
91 | [GETFDPW] = "GETFDPW", | |
92 | [GETFDGR] = "GETFDGR", | |
d19687d6 | 93 | [GETFDHST] = "GETFDHST", |
f7e7a396 UD |
94 | [GETAI] = "GETAI", |
95 | [INITGROUPS] = "INITGROUPS" | |
67479a70 UD |
96 | }; |
97 | ||
98 | /* The control data structures for the services. */ | |
a95a08b4 | 99 | struct database_dyn dbs[lastdb] = |
67479a70 UD |
100 | { |
101 | [pwddb] = { | |
c2e13112 RM |
102 | .lock = PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP, |
103 | .enabled = 0, | |
104 | .check_file = 1, | |
a95a08b4 | 105 | .persistent = 0, |
c207f23b | 106 | .shared = 0, |
c2e13112 | 107 | .filename = "/etc/passwd", |
a95a08b4 | 108 | .db_filename = _PATH_NSCD_PASSWD_DB, |
c2e13112 RM |
109 | .disabled_iov = &pwd_iov_disabled, |
110 | .postimeout = 3600, | |
a95a08b4 UD |
111 | .negtimeout = 20, |
112 | .wr_fd = -1, | |
113 | .ro_fd = -1, | |
114 | .mmap_used = false | |
67479a70 UD |
115 | }, |
116 | [grpdb] = { | |
c2e13112 RM |
117 | .lock = PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP, |
118 | .enabled = 0, | |
119 | .check_file = 1, | |
a95a08b4 | 120 | .persistent = 0, |
c207f23b | 121 | .shared = 0, |
c2e13112 | 122 | .filename = "/etc/group", |
a95a08b4 | 123 | .db_filename = _PATH_NSCD_GROUP_DB, |
c2e13112 RM |
124 | .disabled_iov = &grp_iov_disabled, |
125 | .postimeout = 3600, | |
a95a08b4 UD |
126 | .negtimeout = 60, |
127 | .wr_fd = -1, | |
128 | .ro_fd = -1, | |
129 | .mmap_used = false | |
67479a70 UD |
130 | }, |
131 | [hstdb] = { | |
c2e13112 RM |
132 | .lock = PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP, |
133 | .enabled = 0, | |
134 | .check_file = 1, | |
a95a08b4 | 135 | .persistent = 0, |
c207f23b | 136 | .shared = 0, |
c2e13112 | 137 | .filename = "/etc/hosts", |
a95a08b4 | 138 | .db_filename = _PATH_NSCD_HOSTS_DB, |
c2e13112 RM |
139 | .disabled_iov = &hst_iov_disabled, |
140 | .postimeout = 3600, | |
a95a08b4 UD |
141 | .negtimeout = 20, |
142 | .wr_fd = -1, | |
143 | .ro_fd = -1, | |
144 | .mmap_used = false | |
67479a70 UD |
145 | } |
146 | }; | |
d67281a7 | 147 | |
a95a08b4 UD |
148 | |
149 | /* Mapping of request type to database. */ | |
c207f23b | 150 | static struct database_dyn *const serv2db[LASTREQ] = |
a95a08b4 UD |
151 | { |
152 | [GETPWBYNAME] = &dbs[pwddb], | |
153 | [GETPWBYUID] = &dbs[pwddb], | |
154 | [GETGRBYNAME] = &dbs[grpdb], | |
155 | [GETGRBYGID] = &dbs[grpdb], | |
156 | [GETHOSTBYNAME] = &dbs[hstdb], | |
157 | [GETHOSTBYNAMEv6] = &dbs[hstdb], | |
158 | [GETHOSTBYADDR] = &dbs[hstdb], | |
c207f23b UD |
159 | [GETHOSTBYADDRv6] = &dbs[hstdb], |
160 | [GETFDPW] = &dbs[pwddb], | |
161 | [GETFDGR] = &dbs[grpdb], | |
162 | [GETFDHST] = &dbs[hstdb], | |
d19687d6 | 163 | [GETAI] = &dbs[hstdb], |
f7e7a396 | 164 | [INITGROUPS] = &dbs[grpdb] |
a95a08b4 UD |
165 | }; |
166 | ||
167 | ||
34489d95 UD |
168 | /* Number of seconds between two cache pruning runs. */ |
169 | #define CACHE_PRUNE_INTERVAL 15 | |
170 | ||
a95a08b4 | 171 | |
27e82856 | 172 | /* Initial number of threads to use. */ |
67479a70 | 173 | int nthreads = -1; |
27e82856 UD |
174 | /* Maximum number of threads to use. */ |
175 | int max_nthreads = 32; | |
d67281a7 | 176 | |
67479a70 UD |
177 | /* Socket for incoming connections. */ |
178 | static int sock; | |
d67281a7 | 179 | |
0fdb4f42 UD |
180 | /* Number of times clients had to wait. */ |
181 | unsigned long int client_queued; | |
182 | ||
d67281a7 | 183 | |
67479a70 UD |
184 | /* Initialize database information structures. */ |
185 | void | |
a12ce44f | 186 | nscd_init (void) |
d67281a7 | 187 | { |
67479a70 UD |
188 | struct sockaddr_un sock_addr; |
189 | size_t cnt; | |
d67281a7 | 190 | |
057685e4 UD |
191 | /* Secure mode and unprivileged mode are incompatible */ |
192 | if (server_user != NULL && secure_in_use) | |
193 | { | |
194 | dbg_log (_("Cannot run nscd in secure mode as unprivileged user")); | |
195 | exit (1); | |
196 | } | |
197 | ||
198 | /* Look up unprivileged uid/gid/groups before we start listening on the | |
199 | socket */ | |
200 | if (server_user != NULL) | |
201 | begin_drop_privileges (); | |
202 | ||
67479a70 UD |
203 | if (nthreads == -1) |
204 | /* No configuration for this value, assume a default. */ | |
205 | nthreads = 2 * lastdb; | |
d67281a7 | 206 | |
67479a70 UD |
207 | for (cnt = 0; cnt < lastdb; ++cnt) |
208 | if (dbs[cnt].enabled) | |
9db29cde | 209 | { |
67479a70 | 210 | pthread_rwlock_init (&dbs[cnt].lock, NULL); |
a95a08b4 | 211 | pthread_mutex_init (&dbs[cnt].memlock, NULL); |
264d5b94 | 212 | |
a95a08b4 | 213 | if (dbs[cnt].persistent) |
e09edf23 | 214 | { |
a95a08b4 UD |
215 | /* Try to open the appropriate file on disk. */ |
216 | int fd = open (dbs[cnt].db_filename, O_RDWR); | |
217 | if (fd != -1) | |
218 | { | |
219 | struct stat64 st; | |
220 | void *mem; | |
221 | size_t total; | |
222 | struct database_pers_head head; | |
223 | ssize_t n = TEMP_FAILURE_RETRY (read (fd, &head, | |
224 | sizeof (head))); | |
225 | if (n != sizeof (head) || fstat64 (fd, &st) != 0) | |
226 | { | |
227 | fail_db: | |
228 | dbg_log (_("invalid persistent database file \"%s\": %s"), | |
229 | dbs[cnt].db_filename, strerror (errno)); | |
230 | dbs[cnt].persistent = 0; | |
231 | } | |
232 | else if (head.module == 0 && head.data_size == 0) | |
233 | { | |
234 | /* The file has been created, but the head has not been | |
235 | initialized yet. Remove the old file. */ | |
236 | unlink (dbs[cnt].db_filename); | |
237 | } | |
238 | else if (head.header_size != (int) sizeof (head)) | |
239 | { | |
240 | dbg_log (_("invalid persistent database file \"%s\": %s"), | |
241 | dbs[cnt].db_filename, | |
242 | _("header size does not match")); | |
243 | dbs[cnt].persistent = 0; | |
244 | } | |
245 | else if ((total = (sizeof (head) | |
c207f23b | 246 | + roundup (head.module * sizeof (ref_t), |
a95a08b4 UD |
247 | ALIGN) |
248 | + head.data_size)) | |
c207f23b | 249 | > st.st_size) |
a95a08b4 UD |
250 | { |
251 | dbg_log (_("invalid persistent database file \"%s\": %s"), | |
252 | dbs[cnt].db_filename, | |
253 | _("file size does not match")); | |
254 | dbs[cnt].persistent = 0; | |
255 | } | |
256 | else if ((mem = mmap (NULL, total, PROT_READ | PROT_WRITE, | |
257 | MAP_SHARED, fd, 0)) == MAP_FAILED) | |
258 | goto fail_db; | |
259 | else | |
260 | { | |
261 | /* Success. We have the database. */ | |
262 | dbs[cnt].head = mem; | |
263 | dbs[cnt].memsize = total; | |
264 | dbs[cnt].data = (char *) | |
265 | &dbs[cnt].head->array[roundup (dbs[cnt].head->module, | |
266 | ALIGN / sizeof (ref_t))]; | |
267 | dbs[cnt].mmap_used = true; | |
268 | ||
269 | if (dbs[cnt].suggested_module > head.module) | |
270 | dbg_log (_("suggested size of table for database %s larger than the persistent database's table"), | |
271 | dbnames[cnt]); | |
272 | ||
273 | dbs[cnt].wr_fd = fd; | |
274 | fd = -1; | |
275 | /* We also need a read-only descriptor. */ | |
d13a3c57 UD |
276 | if (dbs[cnt].shared) |
277 | { | |
278 | dbs[cnt].ro_fd = open (dbs[cnt].db_filename, O_RDONLY); | |
279 | if (dbs[cnt].ro_fd == -1) | |
280 | dbg_log (_("\ | |
a95a08b4 | 281 | cannot create read-only descriptor for \"%s\"; no mmap"), |
d13a3c57 UD |
282 | dbs[cnt].db_filename); |
283 | } | |
a95a08b4 UD |
284 | |
285 | // XXX Shall we test whether the descriptors actually | |
286 | // XXX point to the same file? | |
287 | } | |
288 | ||
289 | /* Close the file descriptors in case something went | |
290 | wrong in which case the variable have not been | |
291 | assigned -1. */ | |
292 | if (fd != -1) | |
293 | close (fd); | |
294 | } | |
295 | } | |
296 | ||
297 | if (dbs[cnt].head == NULL) | |
298 | { | |
299 | /* No database loaded. Allocate the data structure, | |
300 | possibly on disk. */ | |
301 | struct database_pers_head head; | |
302 | size_t total = (sizeof (head) | |
303 | + roundup (dbs[cnt].suggested_module | |
304 | * sizeof (ref_t), ALIGN) | |
305 | + (dbs[cnt].suggested_module | |
306 | * DEFAULT_DATASIZE_PER_BUCKET)); | |
307 | ||
308 | /* Try to create the database. If we do not need a | |
309 | persistent database create a temporary file. */ | |
310 | int fd; | |
311 | int ro_fd = -1; | |
312 | if (dbs[cnt].persistent) | |
313 | { | |
314 | fd = open (dbs[cnt].db_filename, | |
315 | O_RDWR | O_CREAT | O_EXCL | O_TRUNC, | |
316 | S_IRUSR | S_IWUSR); | |
d13a3c57 | 317 | if (fd != -1 && dbs[cnt].shared) |
a95a08b4 UD |
318 | ro_fd = open (dbs[cnt].db_filename, O_RDONLY); |
319 | } | |
320 | else | |
321 | { | |
a8a58967 | 322 | char fname[] = _PATH_NSCD_XYZ_DB_TMP; |
a95a08b4 UD |
323 | fd = mkstemp (fname); |
324 | ||
325 | /* We do not need the file name anymore after we | |
326 | opened another file descriptor in read-only mode. */ | |
5ca3d19c | 327 | if (fd != -1) |
a95a08b4 | 328 | { |
5ca3d19c UD |
329 | if (dbs[cnt].shared) |
330 | ro_fd = open (fname, O_RDONLY); | |
a95a08b4 UD |
331 | |
332 | unlink (fname); | |
333 | } | |
334 | } | |
335 | ||
336 | if (fd == -1) | |
337 | { | |
338 | if (errno == EEXIST) | |
339 | { | |
340 | dbg_log (_("database for %s corrupted or simultaneously used; remove %s manually if necessary and restart"), | |
341 | dbnames[cnt], dbs[cnt].db_filename); | |
342 | // XXX Correct way to terminate? | |
343 | exit (1); | |
344 | } | |
345 | ||
346 | if (dbs[cnt].persistent) | |
347 | dbg_log (_("cannot create %s; no persistent database used"), | |
348 | dbs[cnt].db_filename); | |
349 | else | |
350 | dbg_log (_("cannot create %s; no sharing possible"), | |
351 | dbs[cnt].db_filename); | |
352 | ||
353 | dbs[cnt].persistent = 0; | |
354 | // XXX remember: no mmap | |
355 | } | |
356 | else | |
357 | { | |
358 | /* Tell the user if we could not create the read-only | |
359 | descriptor. */ | |
d13a3c57 | 360 | if (ro_fd == -1 && dbs[cnt].shared) |
a95a08b4 UD |
361 | dbg_log (_("\ |
362 | cannot create read-only descriptor for \"%s\"; no mmap"), | |
363 | dbs[cnt].db_filename); | |
364 | ||
365 | /* Before we create the header, initialiye the hash | |
366 | table. So that if we get interrupted if writing | |
367 | the header we can recognize a partially initialized | |
368 | database. */ | |
369 | size_t ps = sysconf (_SC_PAGESIZE); | |
370 | char tmpbuf[ps]; | |
371 | assert (~ENDREF == 0); | |
372 | memset (tmpbuf, '\xff', ps); | |
373 | ||
374 | size_t remaining = dbs[cnt].suggested_module * sizeof (ref_t); | |
375 | off_t offset = sizeof (head); | |
376 | ||
377 | size_t towrite; | |
378 | if (offset % ps != 0) | |
379 | { | |
380 | towrite = MIN (remaining, ps - (offset % ps)); | |
381 | pwrite (fd, tmpbuf, towrite, offset); | |
382 | offset += towrite; | |
383 | remaining -= towrite; | |
384 | } | |
385 | ||
386 | while (remaining > ps) | |
387 | { | |
388 | pwrite (fd, tmpbuf, ps, offset); | |
389 | offset += ps; | |
390 | remaining -= ps; | |
391 | } | |
392 | ||
393 | if (remaining > 0) | |
394 | pwrite (fd, tmpbuf, remaining, offset); | |
395 | ||
396 | /* Create the header of the file. */ | |
397 | struct database_pers_head head = | |
398 | { | |
399 | .version = DB_VERSION, | |
400 | .header_size = sizeof (head), | |
401 | .module = dbs[cnt].suggested_module, | |
402 | .data_size = (dbs[cnt].suggested_module | |
403 | * DEFAULT_DATASIZE_PER_BUCKET), | |
404 | .first_free = 0 | |
405 | }; | |
406 | void *mem; | |
407 | ||
408 | if ((TEMP_FAILURE_RETRY (write (fd, &head, sizeof (head))) | |
409 | != sizeof (head)) | |
410 | || ftruncate (fd, total) != 0 | |
411 | || (mem = mmap (NULL, total, PROT_READ | PROT_WRITE, | |
412 | MAP_SHARED, fd, 0)) == MAP_FAILED) | |
413 | { | |
414 | unlink (dbs[cnt].db_filename); | |
415 | dbg_log (_("cannot write to database file %s: %s"), | |
416 | dbs[cnt].db_filename, strerror (errno)); | |
417 | dbs[cnt].persistent = 0; | |
418 | } | |
419 | else | |
420 | { | |
421 | /* Success. */ | |
422 | dbs[cnt].head = mem; | |
423 | dbs[cnt].data = (char *) | |
424 | &dbs[cnt].head->array[roundup (dbs[cnt].head->module, | |
425 | ALIGN / sizeof (ref_t))]; | |
426 | dbs[cnt].memsize = total; | |
427 | dbs[cnt].mmap_used = true; | |
428 | ||
429 | /* Remember the descriptors. */ | |
430 | dbs[cnt].wr_fd = fd; | |
431 | dbs[cnt].ro_fd = ro_fd; | |
432 | fd = -1; | |
433 | ro_fd = -1; | |
434 | } | |
435 | ||
436 | if (fd != -1) | |
437 | close (fd); | |
438 | if (ro_fd != -1) | |
439 | close (ro_fd); | |
440 | } | |
441 | } | |
442 | ||
4401d759 UD |
443 | if (paranoia |
444 | && ((dbs[cnt].wr_fd != -1 | |
445 | && fcntl (dbs[cnt].wr_fd, F_SETFD, FD_CLOEXEC) == -1) | |
446 | || (dbs[cnt].ro_fd != -1 | |
447 | && fcntl (dbs[cnt].ro_fd, F_SETFD, FD_CLOEXEC) == -1))) | |
448 | { | |
449 | dbg_log (_("\ | |
450 | cannot set socket to close on exec: %s; disabling paranoia mode"), | |
451 | strerror (errno)); | |
452 | paranoia = 0; | |
453 | } | |
454 | ||
a95a08b4 UD |
455 | if (dbs[cnt].head == NULL) |
456 | { | |
457 | /* We do not use the persistent database. Just | |
458 | create an in-memory data structure. */ | |
459 | assert (! dbs[cnt].persistent); | |
460 | ||
461 | dbs[cnt].head = xmalloc (sizeof (struct database_pers_head) | |
462 | + (dbs[cnt].suggested_module | |
463 | * sizeof (ref_t))); | |
464 | memset (dbs[cnt].head, '\0', sizeof (dbs[cnt].head)); | |
465 | assert (~ENDREF == 0); | |
466 | memset (dbs[cnt].head->array, '\xff', | |
467 | dbs[cnt].suggested_module * sizeof (ref_t)); | |
468 | dbs[cnt].head->module = dbs[cnt].suggested_module; | |
469 | dbs[cnt].head->data_size = (DEFAULT_DATASIZE_PER_BUCKET | |
470 | * dbs[cnt].head->module); | |
471 | dbs[cnt].data = xmalloc (dbs[cnt].head->data_size); | |
472 | dbs[cnt].head->first_free = 0; | |
c207f23b UD |
473 | |
474 | dbs[cnt].shared = 0; | |
475 | assert (dbs[cnt].ro_fd == -1); | |
e09edf23 | 476 | } |
d67281a7 | 477 | |
67479a70 | 478 | if (dbs[cnt].check_file) |
d67281a7 | 479 | { |
67479a70 UD |
480 | /* We need the modification date of the file. */ |
481 | struct stat st; | |
d67281a7 | 482 | |
67479a70 | 483 | if (stat (dbs[cnt].filename, &st) < 0) |
d67281a7 | 484 | { |
67479a70 UD |
485 | /* We cannot stat() the file, disable file checking. */ |
486 | dbg_log (_("cannot stat() file `%s': %s"), | |
e09edf23 | 487 | dbs[cnt].filename, strerror (errno)); |
67479a70 | 488 | dbs[cnt].check_file = 0; |
d67281a7 UD |
489 | } |
490 | else | |
67479a70 UD |
491 | dbs[cnt].file_mtime = st.st_mtime; |
492 | } | |
493 | } | |
d67281a7 UD |
494 | |
495 | /* Create the socket. */ | |
67479a70 UD |
496 | sock = socket (AF_UNIX, SOCK_STREAM, 0); |
497 | if (sock < 0) | |
d67281a7 | 498 | { |
67479a70 | 499 | dbg_log (_("cannot open socket: %s"), strerror (errno)); |
d67281a7 UD |
500 | exit (1); |
501 | } | |
502 | /* Bind a name to the socket. */ | |
503 | sock_addr.sun_family = AF_UNIX; | |
504 | strcpy (sock_addr.sun_path, _PATH_NSCDSOCKET); | |
67479a70 | 505 | if (bind (sock, (struct sockaddr *) &sock_addr, sizeof (sock_addr)) < 0) |
d67281a7 UD |
506 | { |
507 | dbg_log ("%s: %s", _PATH_NSCDSOCKET, strerror (errno)); | |
508 | exit (1); | |
509 | } | |
67479a70 | 510 | |
4401d759 | 511 | /* We don't want to get stuck on accept. */ |
d6db0975 | 512 | int fl = fcntl (sock, F_GETFL); |
4401d759 UD |
513 | if (fl == -1 || fcntl (sock, F_SETFL, fl | O_NONBLOCK) == -1) |
514 | { | |
515 | dbg_log (_("cannot change socket to nonblocking mode: %s"), | |
516 | strerror (errno)); | |
517 | exit (1); | |
518 | } | |
519 | ||
520 | /* The descriptor needs to be closed on exec. */ | |
521 | if (paranoia && fcntl (sock, F_SETFD, FD_CLOEXEC) == -1) | |
522 | { | |
523 | dbg_log (_("cannot set socket to close on exec: %s"), | |
524 | strerror (errno)); | |
525 | exit (1); | |
526 | } | |
d6db0975 | 527 | |
d67281a7 | 528 | /* Set permissions for the socket. */ |
a95a08b4 | 529 | chmod (_PATH_NSCDSOCKET, DEFFILEMODE); |
d67281a7 UD |
530 | |
531 | /* Set the socket up to accept connections. */ | |
67479a70 | 532 | if (listen (sock, SOMAXCONN) < 0) |
d67281a7 | 533 | { |
67479a70 UD |
534 | dbg_log (_("cannot enable socket to accept connections: %s"), |
535 | strerror (errno)); | |
d67281a7 UD |
536 | exit (1); |
537 | } | |
057685e4 UD |
538 | |
539 | /* Change to unprivileged uid/gid/groups if specifed in config file */ | |
540 | if (server_user != NULL) | |
541 | finish_drop_privileges (); | |
d67281a7 UD |
542 | } |
543 | ||
67479a70 UD |
544 | |
545 | /* Close the connections. */ | |
d67281a7 | 546 | void |
67479a70 | 547 | close_sockets (void) |
d67281a7 | 548 | { |
67479a70 UD |
549 | close (sock); |
550 | } | |
d67281a7 | 551 | |
a12ce44f | 552 | |
756409c4 | 553 | static void |
549b3c3a | 554 | invalidate_cache (char *key) |
756409c4 UD |
555 | { |
556 | dbtype number; | |
557 | ||
558 | if (strcmp (key, "passwd") == 0) | |
559 | number = pwddb; | |
560 | else if (strcmp (key, "group") == 0) | |
561 | number = grpdb; | |
23700036 | 562 | else if (__builtin_expect (strcmp (key, "hosts"), 0) == 0) |
482bbeb9 UD |
563 | { |
564 | number = hstdb; | |
565 | ||
566 | /* Re-initialize the resolver. resolv.conf might have changed. */ | |
567 | res_init (); | |
568 | } | |
23700036 UD |
569 | else |
570 | return; | |
756409c4 | 571 | |
fd665070 UD |
572 | if (dbs[number].enabled) |
573 | prune_cache (&dbs[number], LONG_MAX); | |
756409c4 UD |
574 | } |
575 | ||
67479a70 | 576 | |
c207f23b UD |
577 | #ifdef SCM_RIGHTS |
578 | static void | |
579 | send_ro_fd (struct database_dyn *db, char *key, int fd) | |
580 | { | |
581 | /* If we do not have an read-only file descriptor do nothing. */ | |
582 | if (db->ro_fd == -1) | |
583 | return; | |
584 | ||
585 | /* We need to send some data along with the descriptor. */ | |
586 | struct iovec iov[1]; | |
587 | iov[0].iov_base = key; | |
588 | iov[0].iov_len = strlen (key) + 1; | |
589 | ||
590 | /* Prepare the control message to transfer the descriptor. */ | |
591 | char buf[CMSG_SPACE (sizeof (int))]; | |
592 | struct msghdr msg = { .msg_iov = iov, .msg_iovlen = 1, | |
593 | .msg_control = buf, .msg_controllen = sizeof (buf) }; | |
594 | struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg); | |
595 | ||
596 | cmsg->cmsg_level = SOL_SOCKET; | |
597 | cmsg->cmsg_type = SCM_RIGHTS; | |
598 | cmsg->cmsg_len = CMSG_LEN (sizeof (int)); | |
599 | ||
600 | *(int *) CMSG_DATA (cmsg) = db->ro_fd; | |
601 | ||
602 | msg.msg_controllen = cmsg->cmsg_len; | |
603 | ||
604 | /* Send the control message. We repeat when we are interrupted but | |
605 | everything else is ignored. */ | |
606 | (void) TEMP_FAILURE_RETRY (sendmsg (fd, &msg, 0)); | |
607 | ||
608 | if (__builtin_expect (debug_level > 0, 0)) | |
609 | dbg_log (_("provide access to FD %d, for %s"), db->ro_fd, key); | |
610 | } | |
611 | #endif /* SCM_RIGHTS */ | |
612 | ||
613 | ||
67479a70 UD |
614 | /* Handle new request. */ |
615 | static void | |
a1c542bf | 616 | handle_request (int fd, request_header *req, void *key, uid_t uid) |
67479a70 | 617 | { |
23700036 | 618 | if (__builtin_expect (req->version, NSCD_VERSION) != NSCD_VERSION) |
d67281a7 | 619 | { |
98e75a1c UD |
620 | if (debug_level > 0) |
621 | dbg_log (_("\ | |
67479a70 | 622 | cannot handle old request version %d; current version is %d"), |
98e75a1c | 623 | req->version, NSCD_VERSION); |
d67281a7 UD |
624 | return; |
625 | } | |
626 | ||
74a30a58 UD |
627 | /* Make the SELinux check before we go on to the standard checks. We |
628 | need to verify that the request type is valid, since it has not | |
629 | yet been checked at this point. */ | |
630 | if (selinux_enabled | |
631 | && __builtin_expect (req->type, GETPWBYNAME) >= GETPWBYNAME | |
632 | && __builtin_expect (req->type, LASTREQ) < LASTREQ | |
633 | && nscd_request_avc_has_perm (fd, req->type) != 0) | |
634 | return; | |
635 | ||
a95a08b4 UD |
636 | struct database_dyn *db = serv2db[req->type]; |
637 | ||
f7e7a396 UD |
638 | // XXX Clean up so that each new command need not introduce a |
639 | // XXX new conditional. | |
d19687d6 UD |
640 | if ((__builtin_expect (req->type, GETPWBYNAME) >= GETPWBYNAME |
641 | && __builtin_expect (req->type, LASTDBREQ) <= LASTDBREQ) | |
f7e7a396 | 642 | || req->type == GETAI || req->type == INITGROUPS) |
d67281a7 | 643 | { |
23700036 | 644 | if (__builtin_expect (debug_level, 0) > 0) |
8d8c6efa UD |
645 | { |
646 | if (req->type == GETHOSTBYADDR || req->type == GETHOSTBYADDRv6) | |
647 | { | |
648 | char buf[INET6_ADDRSTRLEN]; | |
649 | ||
650 | dbg_log ("\t%s (%s)", serv2str[req->type], | |
651 | inet_ntop (req->type == GETHOSTBYADDR | |
652 | ? AF_INET : AF_INET6, | |
653 | key, buf, sizeof (buf))); | |
654 | } | |
655 | else | |
a95a08b4 | 656 | dbg_log ("\t%s (%s)", serv2str[req->type], (char *) key); |
8d8c6efa | 657 | } |
d67281a7 | 658 | |
67479a70 UD |
659 | /* Is this service enabled? */ |
660 | if (!db->enabled) | |
661 | { | |
ce85d65b | 662 | /* No, sent the prepared record. */ |
67479a70 UD |
663 | if (TEMP_FAILURE_RETRY (write (fd, db->disabled_iov->iov_base, |
664 | db->disabled_iov->iov_len)) | |
4c5dd2a2 | 665 | != (ssize_t) db->disabled_iov->iov_len |
23700036 | 666 | && __builtin_expect (debug_level, 0) > 0) |
67479a70 UD |
667 | { |
668 | /* We have problems sending the result. */ | |
669 | char buf[256]; | |
670 | dbg_log (_("cannot write result: %s"), | |
671 | strerror_r (errno, buf, sizeof (buf))); | |
672 | } | |
d67281a7 | 673 | |
67479a70 UD |
674 | return; |
675 | } | |
d67281a7 | 676 | |
67479a70 | 677 | /* Be sure we can read the data. */ |
c86e6aec UD |
678 | if (__builtin_expect (pthread_rwlock_tryrdlock (&db->lock) != 0, 0)) |
679 | { | |
a95a08b4 | 680 | ++db->head->rdlockdelayed; |
c86e6aec UD |
681 | pthread_rwlock_rdlock (&db->lock); |
682 | } | |
67479a70 UD |
683 | |
684 | /* See whether we can handle it from the cache. */ | |
a95a08b4 UD |
685 | struct datahead *cached; |
686 | cached = (struct datahead *) cache_search (req->type, key, req->key_len, | |
687 | db, uid); | |
67479a70 UD |
688 | if (cached != NULL) |
689 | { | |
690 | /* Hurray it's in the cache. */ | |
a95a08b4 UD |
691 | if (TEMP_FAILURE_RETRY (write (fd, cached->data, cached->recsize)) |
692 | != cached->recsize | |
23700036 | 693 | && __builtin_expect (debug_level, 0) > 0) |
67479a70 UD |
694 | { |
695 | /* We have problems sending the result. */ | |
696 | char buf[256]; | |
697 | dbg_log (_("cannot write result: %s"), | |
698 | strerror_r (errno, buf, sizeof (buf))); | |
699 | } | |
700 | ||
701 | pthread_rwlock_unlock (&db->lock); | |
702 | ||
703 | return; | |
704 | } | |
705 | ||
706 | pthread_rwlock_unlock (&db->lock); | |
d67281a7 | 707 | } |
23700036 | 708 | else if (__builtin_expect (debug_level, 0) > 0) |
756409c4 UD |
709 | { |
710 | if (req->type == INVALIDATE) | |
c207f23b | 711 | dbg_log ("\t%s (%s)", serv2str[req->type], (char *) key); |
0532e21b | 712 | else |
a95a08b4 | 713 | dbg_log ("\t%s", serv2str[req->type]); |
756409c4 | 714 | } |
67479a70 UD |
715 | |
716 | /* Handle the request. */ | |
717 | switch (req->type) | |
d67281a7 | 718 | { |
67479a70 | 719 | case GETPWBYNAME: |
a95a08b4 | 720 | addpwbyname (db, fd, req, key, uid); |
67479a70 UD |
721 | break; |
722 | ||
723 | case GETPWBYUID: | |
a95a08b4 | 724 | addpwbyuid (db, fd, req, key, uid); |
67479a70 UD |
725 | break; |
726 | ||
727 | case GETGRBYNAME: | |
a95a08b4 | 728 | addgrbyname (db, fd, req, key, uid); |
67479a70 UD |
729 | break; |
730 | ||
731 | case GETGRBYGID: | |
a95a08b4 | 732 | addgrbygid (db, fd, req, key, uid); |
67479a70 UD |
733 | break; |
734 | ||
735 | case GETHOSTBYNAME: | |
a95a08b4 | 736 | addhstbyname (db, fd, req, key, uid); |
67479a70 UD |
737 | break; |
738 | ||
739 | case GETHOSTBYNAMEv6: | |
a95a08b4 | 740 | addhstbynamev6 (db, fd, req, key, uid); |
67479a70 UD |
741 | break; |
742 | ||
743 | case GETHOSTBYADDR: | |
a95a08b4 | 744 | addhstbyaddr (db, fd, req, key, uid); |
67479a70 UD |
745 | break; |
746 | ||
747 | case GETHOSTBYADDRv6: | |
a95a08b4 | 748 | addhstbyaddrv6 (db, fd, req, key, uid); |
67479a70 UD |
749 | break; |
750 | ||
d19687d6 UD |
751 | case GETAI: |
752 | addhstai (db, fd, req, key, uid); | |
753 | break; | |
754 | ||
f7e7a396 UD |
755 | case INITGROUPS: |
756 | addinitgroups (db, fd, req, key, uid); | |
757 | break; | |
758 | ||
67479a70 | 759 | case GETSTAT: |
67479a70 | 760 | case SHUTDOWN: |
756409c4 | 761 | case INVALIDATE: |
a12ce44f | 762 | if (! secure_in_use) |
54000924 | 763 | { |
a12ce44f | 764 | /* Get the callers credentials. */ |
cedc8559 | 765 | #ifdef SO_PEERCRED |
be3c40b6 RM |
766 | struct ucred caller; |
767 | socklen_t optlen = sizeof (caller); | |
768 | ||
a1c542bf UD |
769 | if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &caller, &optlen) < 0) |
770 | { | |
771 | char buf[256]; | |
772 | ||
773 | dbg_log (_("error getting callers id: %s"), | |
774 | strerror_r (errno, buf, sizeof (buf))); | |
a12ce44f | 775 | break; |
a1c542bf | 776 | } |
a12ce44f UD |
777 | |
778 | uid = caller.uid; | |
779 | #else | |
780 | /* Some systems have no SO_PEERCRED implementation. They don't | |
781 | care about security so we don't as well. */ | |
782 | uid = 0; | |
cedc8559 | 783 | #endif |
a12ce44f UD |
784 | } |
785 | ||
786 | /* Accept shutdown, getstat and invalidate only from root. For | |
787 | the stat call also allow the user specified in the config file. */ | |
788 | if (req->type == GETSTAT) | |
789 | { | |
790 | if (uid == 0 || uid == stat_uid) | |
791 | send_stats (fd, dbs); | |
792 | } | |
793 | else if (uid == 0) | |
794 | { | |
795 | if (req->type == INVALIDATE) | |
796 | invalidate_cache (key); | |
797 | else | |
798 | termination_handler (0); | |
a1c542bf | 799 | } |
67479a70 UD |
800 | break; |
801 | ||
c207f23b UD |
802 | case GETFDPW: |
803 | case GETFDGR: | |
804 | case GETFDHST: | |
805 | #ifdef SCM_RIGHTS | |
806 | send_ro_fd (serv2db[req->type], key, fd); | |
807 | #endif | |
808 | break; | |
809 | ||
67479a70 | 810 | default: |
64acf8ed UD |
811 | /* Ignore the command, it's nothing we know. */ |
812 | break; | |
d67281a7 | 813 | } |
67479a70 UD |
814 | } |
815 | ||
d67281a7 | 816 | |
4401d759 UD |
817 | /* Restart the process. */ |
818 | static void | |
819 | restart (void) | |
820 | { | |
821 | /* First determine the parameters. We do not use the parameters | |
822 | passed to main() since in case nscd is started by running the | |
823 | dynamic linker this will not work. Yes, this is not the usual | |
824 | case but nscd is part of glibc and we occasionally do this. */ | |
825 | size_t buflen = 1024; | |
826 | char *buf = alloca (buflen); | |
827 | size_t readlen = 0; | |
828 | int fd = open ("/proc/self/cmdline", O_RDONLY); | |
829 | if (fd == -1) | |
830 | { | |
831 | dbg_log (_("\ | |
832 | cannot open /proc/self/cmdline: %s; disabling paranoia mode"), | |
833 | strerror (errno)); | |
834 | ||
835 | paranoia = 0; | |
836 | return; | |
837 | } | |
838 | ||
839 | while (1) | |
840 | { | |
841 | ssize_t n = TEMP_FAILURE_RETRY (read (fd, buf + readlen, | |
842 | buflen - readlen)); | |
843 | if (n == -1) | |
844 | { | |
845 | dbg_log (_("\ | |
846 | cannot open /proc/self/cmdline: %s; disabling paranoia mode"), | |
847 | strerror (errno)); | |
848 | ||
849 | close (fd); | |
850 | paranoia = 0; | |
851 | return; | |
852 | } | |
853 | ||
854 | readlen += n; | |
855 | ||
856 | if (readlen < buflen) | |
857 | break; | |
858 | ||
859 | /* We might have to extend the buffer. */ | |
860 | size_t old_buflen = buflen; | |
861 | char *newp = extend_alloca (buf, buflen, 2 * buflen); | |
862 | buf = memmove (newp, buf, old_buflen); | |
863 | } | |
864 | ||
865 | close (fd); | |
866 | ||
867 | /* Parse the command line. Worst case scenario: every two | |
868 | characters form one parameter (one character plus NUL). */ | |
869 | char **argv = alloca ((readlen / 2 + 1) * sizeof (argv[0])); | |
870 | int argc = 0; | |
871 | ||
872 | char *cp = buf; | |
873 | while (cp < buf + readlen) | |
874 | { | |
875 | argv[argc++] = cp; | |
876 | cp = (char *) rawmemchr (cp, '\0') + 1; | |
877 | } | |
878 | argv[argc] = NULL; | |
879 | ||
880 | /* Second, change back to the old user if we changed it. */ | |
881 | if (server_user != NULL) | |
882 | { | |
883 | if (setuid (old_uid) != 0) | |
884 | { | |
885 | dbg_log (_("\ | |
886 | cannot change to old UID: %s; disabling paranoia mode"), | |
887 | strerror (errno)); | |
888 | ||
889 | paranoia = 0; | |
890 | return; | |
891 | } | |
892 | ||
893 | if (setgid (old_gid) != 0) | |
894 | { | |
895 | dbg_log (_("\ | |
896 | cannot change to old GID: %s; disabling paranoia mode"), | |
897 | strerror (errno)); | |
898 | ||
899 | setuid (server_uid); | |
900 | paranoia = 0; | |
901 | return; | |
902 | } | |
903 | } | |
904 | ||
905 | /* Next change back to the old working directory. */ | |
906 | if (chdir (oldcwd) == -1) | |
907 | { | |
908 | dbg_log (_("\ | |
909 | cannot change to old working directory: %s; disabling paranoia mode"), | |
910 | strerror (errno)); | |
911 | ||
912 | if (server_user != NULL) | |
913 | { | |
914 | setuid (server_uid); | |
915 | setgid (server_gid); | |
916 | } | |
917 | paranoia = 0; | |
918 | return; | |
919 | } | |
920 | ||
921 | /* Synchronize memory. */ | |
922 | for (int cnt = 0; cnt < lastdb; ++cnt) | |
923 | { | |
924 | /* Make sure nobody keeps using the database. */ | |
925 | dbs[cnt].head->timestamp = 0; | |
926 | ||
927 | if (dbs[cnt].persistent) | |
928 | // XXX async OK? | |
929 | msync (dbs[cnt].head, dbs[cnt].memsize, MS_ASYNC); | |
930 | } | |
931 | ||
932 | /* The preparations are done. */ | |
933 | execv ("/proc/self/exe", argv); | |
934 | ||
935 | /* If we come here, we will never be able to re-exec. */ | |
936 | dbg_log (_("re-exec failed: %s; disabling paranoia mode"), | |
937 | strerror (errno)); | |
938 | ||
939 | if (server_user != NULL) | |
940 | { | |
941 | setuid (server_uid); | |
942 | setgid (server_gid); | |
943 | } | |
944 | chdir ("/"); | |
945 | paranoia = 0; | |
946 | } | |
947 | ||
948 | ||
1945c96f UD |
949 | /* List of file descriptors. */ |
950 | struct fdlist | |
951 | { | |
952 | int fd; | |
953 | struct fdlist *next; | |
954 | }; | |
955 | /* Memory allocated for the list. */ | |
956 | static struct fdlist *fdlist; | |
957 | /* List of currently ready-to-read file descriptors. */ | |
958 | static struct fdlist *readylist; | |
959 | ||
960 | /* Conditional variable and mutex to signal availability of entries in | |
961 | READYLIST. The condvar is initialized dynamically since we might | |
962 | use a different clock depending on availability. */ | |
963 | static pthread_cond_t readylist_cond; | |
964 | static pthread_mutex_t readylist_lock = PTHREAD_MUTEX_INITIALIZER; | |
965 | ||
966 | /* The clock to use with the condvar. */ | |
967 | static clockid_t timeout_clock = CLOCK_REALTIME; | |
968 | ||
969 | /* Number of threads ready to handle the READYLIST. */ | |
970 | static unsigned long int nready; | |
971 | ||
972 | ||
67479a70 UD |
973 | /* This is the main loop. It is replicated in different threads but the |
974 | `poll' call makes sure only one thread handles an incoming connection. */ | |
975 | static void * | |
976 | __attribute__ ((__noreturn__)) | |
977 | nscd_run (void *p) | |
978 | { | |
1945c96f UD |
979 | const long int my_number = (long int) p; |
980 | const int run_prune = my_number < lastdb && dbs[my_number].enabled; | |
981 | struct timespec prune_ts; | |
982 | int to = 0; | |
983 | char buf[256]; | |
264d5b94 | 984 | |
72ae1e97 | 985 | if (run_prune) |
1945c96f UD |
986 | { |
987 | setup_thread (&dbs[my_number]); | |
081fc592 | 988 | |
1945c96f UD |
989 | /* We are running. */ |
990 | dbs[my_number].head->timestamp = time (NULL); | |
d67281a7 | 991 | |
1945c96f UD |
992 | if (clock_gettime (timeout_clock, &prune_ts) == -1) |
993 | /* Should never happen. */ | |
994 | abort (); | |
0fdb4f42 | 995 | |
1945c96f UD |
996 | /* Compute timeout time. */ |
997 | prune_ts.tv_sec += CACHE_PRUNE_INTERVAL; | |
998 | } | |
999 | ||
1000 | /* Initial locking. */ | |
1001 | pthread_mutex_lock (&readylist_lock); | |
1002 | ||
1003 | /* One more thread available. */ | |
1004 | ++nready; | |
0fdb4f42 | 1005 | |
1945c96f UD |
1006 | while (1) |
1007 | { | |
1008 | while (readylist == NULL) | |
d6db0975 | 1009 | { |
d6db0975 UD |
1010 | if (run_prune) |
1011 | { | |
1945c96f UD |
1012 | /* Wait, but not forever. */ |
1013 | to = pthread_cond_timedwait (&readylist_cond, &readylist_lock, | |
1014 | &prune_ts); | |
1015 | ||
1016 | /* If we were woken and there is no work to be done, | |
1017 | just start pruning. */ | |
1018 | if (readylist == NULL && to == ETIMEDOUT) | |
1019 | { | |
4401d759 | 1020 | --nready; |
1945c96f UD |
1021 | pthread_mutex_unlock (&readylist_lock); |
1022 | goto only_prune; | |
1023 | } | |
d6db0975 | 1024 | } |
1945c96f UD |
1025 | else |
1026 | /* No need to timeout. */ | |
1027 | pthread_cond_wait (&readylist_cond, &readylist_lock); | |
1028 | } | |
0fdb4f42 | 1029 | |
1945c96f UD |
1030 | struct fdlist *it = readylist->next; |
1031 | if (readylist->next == readylist) | |
1032 | /* Just one entry on the list. */ | |
1033 | readylist = NULL; | |
1034 | else | |
1035 | readylist->next = it->next; | |
0fdb4f42 | 1036 | |
1945c96f UD |
1037 | /* Extract the information and mark the record ready to be used |
1038 | again. */ | |
1039 | int fd = it->fd; | |
1040 | it->next = NULL; | |
0fdb4f42 | 1041 | |
1945c96f UD |
1042 | /* One more thread available. */ |
1043 | --nready; | |
67479a70 | 1044 | |
1945c96f UD |
1045 | /* We are done with the list. */ |
1046 | pthread_mutex_unlock (&readylist_lock); | |
67479a70 | 1047 | |
1945c96f UD |
1048 | /* We do not want to block on a short read or so. */ |
1049 | int fl = fcntl (fd, F_GETFL); | |
1050 | if (fl == -1 || fcntl (fd, F_SETFL, fl | O_NONBLOCK) == -1) | |
1051 | goto close_and_out; | |
0fdb4f42 UD |
1052 | |
1053 | /* Now read the request. */ | |
1945c96f | 1054 | request_header req; |
0fdb4f42 UD |
1055 | if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, &req, sizeof (req))) |
1056 | != sizeof (req), 0)) | |
d67281a7 | 1057 | { |
1945c96f UD |
1058 | /* We failed to read data. Note that this also might mean we |
1059 | failed because we would have blocked. */ | |
0fdb4f42 UD |
1060 | if (debug_level > 0) |
1061 | dbg_log (_("short read while reading request: %s"), | |
1062 | strerror_r (errno, buf, sizeof (buf))); | |
1945c96f | 1063 | goto close_and_out; |
0fdb4f42 UD |
1064 | } |
1065 | ||
3c82c131 UD |
1066 | /* Check whether this is a valid request type. */ |
1067 | if (req.type < GETPWBYNAME || req.type >= LASTREQ) | |
1068 | goto close_and_out; | |
1069 | ||
0fdb4f42 UD |
1070 | /* Some systems have no SO_PEERCRED implementation. They don't |
1071 | care about security so we don't as well. */ | |
1945c96f | 1072 | uid_t uid = -1; |
c86e6aec | 1073 | #ifdef SO_PEERCRED |
1945c96f UD |
1074 | pid_t pid = 0; |
1075 | ||
0fdb4f42 UD |
1076 | if (secure_in_use) |
1077 | { | |
1078 | struct ucred caller; | |
1079 | socklen_t optlen = sizeof (caller); | |
d67281a7 | 1080 | |
0fdb4f42 | 1081 | if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &caller, &optlen) < 0) |
d67281a7 | 1082 | { |
0fdb4f42 | 1083 | dbg_log (_("error getting callers id: %s"), |
67479a70 | 1084 | strerror_r (errno, buf, sizeof (buf))); |
3c82c131 | 1085 | goto close_and_out; |
67479a70 | 1086 | } |
264d5b94 | 1087 | |
0fdb4f42 | 1088 | if (req.type < GETPWBYNAME || req.type > LASTDBREQ |
a95a08b4 | 1089 | || serv2db[req.type]->secure) |
0fdb4f42 | 1090 | uid = caller.uid; |
c86e6aec | 1091 | |
a12ce44f | 1092 | pid = caller.pid; |
0fdb4f42 UD |
1093 | } |
1094 | else if (__builtin_expect (debug_level > 0, 0)) | |
1095 | { | |
1096 | struct ucred caller; | |
1097 | socklen_t optlen = sizeof (caller); | |
c86e6aec | 1098 | |
0fdb4f42 UD |
1099 | if (getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &caller, &optlen) == 0) |
1100 | pid = caller.pid; | |
1101 | } | |
cedc8559 | 1102 | #endif |
a1c542bf | 1103 | |
0fdb4f42 UD |
1104 | /* It should not be possible to crash the nscd with a silly |
1105 | request (i.e., a terribly large key). We limit the size to 1kb. */ | |
1945c96f | 1106 | #define MAXKEYLEN 1024 |
0fdb4f42 | 1107 | if (__builtin_expect (req.key_len, 1) < 0 |
1945c96f | 1108 | || __builtin_expect (req.key_len, 1) > MAXKEYLEN) |
0fdb4f42 UD |
1109 | { |
1110 | if (debug_level > 0) | |
1111 | dbg_log (_("key length in request too long: %d"), req.key_len); | |
0fdb4f42 UD |
1112 | } |
1113 | else | |
1114 | { | |
1115 | /* Get the key. */ | |
1945c96f | 1116 | char keybuf[MAXKEYLEN]; |
0fdb4f42 UD |
1117 | |
1118 | if (__builtin_expect (TEMP_FAILURE_RETRY (read (fd, keybuf, | |
1119 | req.key_len)) | |
1120 | != req.key_len, 0)) | |
67479a70 | 1121 | { |
1945c96f | 1122 | /* Again, this can also mean we would have blocked. */ |
98e75a1c | 1123 | if (debug_level > 0) |
0fdb4f42 UD |
1124 | dbg_log (_("short read while reading request key: %s"), |
1125 | strerror_r (errno, buf, sizeof (buf))); | |
1945c96f | 1126 | goto close_and_out; |
67479a70 | 1127 | } |
0fdb4f42 UD |
1128 | |
1129 | if (__builtin_expect (debug_level, 0) > 0) | |
67479a70 | 1130 | { |
c86e6aec | 1131 | #ifdef SO_PEERCRED |
0fdb4f42 UD |
1132 | if (pid != 0) |
1133 | dbg_log (_("\ | |
c86e6aec | 1134 | handle_request: request received (Version = %d) from PID %ld"), |
0fdb4f42 UD |
1135 | req.version, (long int) pid); |
1136 | else | |
c86e6aec | 1137 | #endif |
0fdb4f42 | 1138 | dbg_log (_("\ |
c86e6aec | 1139 | handle_request: request received (Version = %d)"), req.version); |
0fdb4f42 | 1140 | } |
c86e6aec | 1141 | |
0fdb4f42 UD |
1142 | /* Phew, we got all the data, now process it. */ |
1143 | handle_request (fd, &req, keybuf, uid); | |
d67281a7 | 1144 | } |
264d5b94 | 1145 | |
3c82c131 UD |
1146 | close_and_out: |
1147 | /* We are done. */ | |
1148 | close (fd); | |
1149 | ||
1945c96f UD |
1150 | /* Check whether we should be pruning the cache. */ |
1151 | assert (run_prune || to == 0); | |
1152 | if (to == ETIMEDOUT) | |
1153 | { | |
1154 | only_prune: | |
1155 | /* The pthread_cond_timedwait() call timed out. It is time | |
1156 | to clean up the cache. */ | |
1157 | assert (my_number < lastdb); | |
1158 | prune_cache (&dbs[my_number], | |
1159 | prune_ts.tv_sec + (prune_ts.tv_nsec >= 500000000)); | |
1160 | ||
1161 | if (clock_gettime (timeout_clock, &prune_ts) == -1) | |
1162 | /* Should never happen. */ | |
1163 | abort (); | |
1164 | ||
1165 | /* Compute next timeout time. */ | |
1166 | prune_ts.tv_sec += CACHE_PRUNE_INTERVAL; | |
1167 | ||
1168 | /* In case the list is emtpy we do not want to run the prune | |
1169 | code right away again. */ | |
1170 | to = 0; | |
1171 | } | |
1172 | ||
1173 | /* Re-locking. */ | |
1174 | pthread_mutex_lock (&readylist_lock); | |
1175 | ||
1176 | /* One more thread available. */ | |
1177 | ++nready; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | ||
fc03df7a UD |
1182 | static unsigned int nconns; |
1183 | ||
1945c96f | 1184 | static void |
fc03df7a | 1185 | fd_ready (int fd) |
1945c96f | 1186 | { |
fc03df7a UD |
1187 | pthread_mutex_lock (&readylist_lock); |
1188 | ||
1189 | /* Find an empty entry in FDLIST. */ | |
1190 | size_t inner; | |
1191 | for (inner = 0; inner < nconns; ++inner) | |
1192 | if (fdlist[inner].next == NULL) | |
1193 | break; | |
1194 | assert (inner < nconns); | |
1195 | ||
1196 | fdlist[inner].fd = fd; | |
1197 | ||
1198 | if (readylist == NULL) | |
1199 | readylist = fdlist[inner].next = &fdlist[inner]; | |
1945c96f | 1200 | else |
fc03df7a UD |
1201 | { |
1202 | fdlist[inner].next = readylist->next; | |
1203 | readylist = readylist->next = &fdlist[inner]; | |
1204 | } | |
1205 | ||
1206 | bool do_signal = true; | |
1207 | if (__builtin_expect (nready == 0, 0)) | |
1208 | { | |
1209 | ++client_queued; | |
1210 | do_signal = false; | |
27e82856 UD |
1211 | |
1212 | /* Try to start another thread to help out. */ | |
1213 | pthread_t th; | |
1214 | if (nthreads < max_nthreads | |
1215 | && pthread_create (&th, &attr, nscd_run, | |
1216 | (void *) (long int) nthreads) == 0) | |
1217 | { | |
1218 | /* We got another thread. */ | |
1219 | ++nthreads; | |
1220 | /* The new thread might new a kick. */ | |
1221 | do_signal = true; | |
1222 | } | |
1223 | ||
fc03df7a UD |
1224 | } |
1225 | ||
1226 | pthread_mutex_unlock (&readylist_lock); | |
1227 | ||
1228 | /* Tell one of the worker threads there is work to do. */ | |
1229 | if (do_signal) | |
1230 | pthread_cond_signal (&readylist_cond); | |
1231 | } | |
1945c96f | 1232 | |
fc03df7a | 1233 | |
4401d759 UD |
1234 | /* Check whether restarting should happen. */ |
1235 | static inline int | |
1236 | restart_p (time_t now) | |
1237 | { | |
1238 | return (paranoia && readylist == NULL && nready == nthreads | |
1239 | && now >= restart_time); | |
1240 | } | |
1241 | ||
1242 | ||
1243 | /* Array for times a connection was accepted. */ | |
fc03df7a UD |
1244 | static time_t *starttime; |
1245 | ||
1246 | ||
1247 | static void | |
1248 | __attribute__ ((__noreturn__)) | |
1249 | main_loop_poll (void) | |
1250 | { | |
1945c96f UD |
1251 | struct pollfd *conns = (struct pollfd *) xmalloc (nconns |
1252 | * sizeof (conns[0])); | |
1253 | ||
1945c96f UD |
1254 | conns[0].fd = sock; |
1255 | conns[0].events = POLLRDNORM; | |
1256 | size_t nused = 1; | |
1257 | size_t firstfree = 1; | |
1258 | ||
1259 | while (1) | |
1260 | { | |
1261 | /* Wait for any event. We wait at most a couple of seconds so | |
1262 | that we can check whether we should close any of the accepted | |
1263 | connections since we have not received a request. */ | |
1264 | #define MAX_ACCEPT_TIMEOUT 30 | |
1265 | #define MIN_ACCEPT_TIMEOUT 5 | |
1266 | #define MAIN_THREAD_TIMEOUT \ | |
1267 | (MAX_ACCEPT_TIMEOUT * 1000 \ | |
1268 | - ((MAX_ACCEPT_TIMEOUT - MIN_ACCEPT_TIMEOUT) * 1000 * nused) / (2 * nconns)) | |
1269 | ||
1270 | int n = poll (conns, nused, MAIN_THREAD_TIMEOUT); | |
1271 | ||
1272 | time_t now = time (NULL); | |
1273 | ||
1274 | /* If there is a descriptor ready for reading or there is a new | |
1275 | connection, process this now. */ | |
1276 | if (n > 0) | |
67479a70 | 1277 | { |
1945c96f UD |
1278 | if (conns[0].revents != 0) |
1279 | { | |
1280 | /* We have a new incoming connection. Accept the connection. */ | |
1281 | int fd = TEMP_FAILURE_RETRY (accept (sock, NULL, NULL)); | |
1282 | ||
fc03df7a UD |
1283 | /* use the descriptor if we have not reached the limit. */ |
1284 | if (fd >= 0 && firstfree < nconns) | |
1945c96f | 1285 | { |
1945c96f UD |
1286 | conns[firstfree].fd = fd; |
1287 | conns[firstfree].events = POLLRDNORM; | |
1288 | starttime[firstfree] = now; | |
1289 | if (firstfree >= nused) | |
1290 | nused = firstfree + 1; | |
1291 | ||
1292 | do | |
1293 | ++firstfree; | |
1294 | while (firstfree < nused && conns[firstfree].fd != -1); | |
1295 | } | |
1296 | ||
1945c96f UD |
1297 | --n; |
1298 | } | |
1299 | ||
1300 | for (size_t cnt = 1; cnt < nused && n > 0; ++cnt) | |
1301 | if (conns[cnt].revents != 0) | |
1302 | { | |
fc03df7a | 1303 | fd_ready (conns[cnt].fd); |
1945c96f UD |
1304 | |
1305 | /* Clean up the CONNS array. */ | |
1306 | conns[cnt].fd = -1; | |
1307 | if (cnt < firstfree) | |
1308 | firstfree = cnt; | |
1309 | if (cnt == nused - 1) | |
1310 | do | |
1311 | --nused; | |
1312 | while (conns[nused - 1].fd == -1); | |
1313 | ||
1314 | --n; | |
1315 | } | |
1316 | } | |
1317 | ||
1318 | /* Now find entries which have timed out. */ | |
1319 | assert (nused > 0); | |
fc03df7a UD |
1320 | |
1321 | /* We make the timeout length depend on the number of file | |
1322 | descriptors currently used. */ | |
1945c96f UD |
1323 | #define ACCEPT_TIMEOUT \ |
1324 | (MAX_ACCEPT_TIMEOUT \ | |
1325 | - ((MAX_ACCEPT_TIMEOUT - MIN_ACCEPT_TIMEOUT) * nused) / nconns) | |
fc03df7a | 1326 | time_t laststart = now - ACCEPT_TIMEOUT; |
1945c96f | 1327 | |
fc03df7a UD |
1328 | for (size_t cnt = nused - 1; cnt > 0; --cnt) |
1329 | { | |
1945c96f UD |
1330 | if (conns[cnt].fd != -1 && starttime[cnt] < laststart) |
1331 | { | |
1332 | /* Remove the entry, it timed out. */ | |
1333 | (void) close (conns[cnt].fd); | |
1334 | conns[cnt].fd = -1; | |
1335 | ||
1336 | if (cnt < firstfree) | |
1337 | firstfree = cnt; | |
1338 | if (cnt == nused - 1) | |
1339 | do | |
1340 | --nused; | |
1341 | while (conns[nused - 1].fd == -1); | |
1342 | } | |
67479a70 | 1343 | } |
4401d759 UD |
1344 | |
1345 | if (restart_p (now)) | |
1346 | restart (); | |
67308730 | 1347 | } |
d67281a7 UD |
1348 | } |
1349 | ||
67479a70 | 1350 | |
fc03df7a UD |
1351 | #ifdef HAVE_EPOLL |
1352 | static void | |
1353 | main_loop_epoll (int efd) | |
1354 | { | |
1355 | struct epoll_event ev = { 0, }; | |
1356 | int nused = 1; | |
1357 | size_t highest = 0; | |
1358 | ||
1359 | /* Add the socket. */ | |
1360 | ev.events = EPOLLRDNORM; | |
1361 | ev.data.fd = sock; | |
1362 | if (epoll_ctl (efd, EPOLL_CTL_ADD, sock, &ev) == -1) | |
1363 | /* We cannot use epoll. */ | |
1364 | return; | |
1365 | ||
1366 | while (1) | |
1367 | { | |
1368 | struct epoll_event revs[100]; | |
1369 | # define nrevs (sizeof (revs) / sizeof (revs[0])) | |
1370 | ||
1371 | int n = epoll_wait (efd, revs, nrevs, MAIN_THREAD_TIMEOUT); | |
1372 | ||
1373 | time_t now = time (NULL); | |
1374 | ||
1375 | for (int cnt = 0; cnt < n; ++cnt) | |
1376 | if (revs[cnt].data.fd == sock) | |
1377 | { | |
1378 | /* A new connection. */ | |
1379 | int fd = TEMP_FAILURE_RETRY (accept (sock, NULL, NULL)); | |
1380 | ||
1381 | if (fd >= 0) | |
1382 | { | |
1383 | /* Try to add the new descriptor. */ | |
1384 | ev.data.fd = fd; | |
1385 | if (fd >= nconns | |
1386 | || epoll_ctl (efd, EPOLL_CTL_ADD, fd, &ev) == -1) | |
1387 | /* The descriptor is too large or something went | |
1388 | wrong. Close the descriptor. */ | |
1389 | close (fd); | |
1390 | else | |
1391 | { | |
1392 | /* Remember when we accepted the connection. */ | |
1393 | starttime[fd] = now; | |
1394 | ||
1395 | if (fd > highest) | |
1396 | highest = fd; | |
1397 | ||
1398 | ++nused; | |
1399 | } | |
1400 | } | |
1401 | } | |
1402 | else | |
1403 | { | |
1404 | /* Remove the descriptor from the epoll descriptor. */ | |
1405 | struct epoll_event ev = { 0, }; | |
1406 | (void) epoll_ctl (efd, EPOLL_CTL_DEL, revs[cnt].data.fd, &ev); | |
1407 | ||
1408 | /* Get a worked to handle the request. */ | |
1409 | fd_ready (revs[cnt].data.fd); | |
1410 | ||
1411 | /* Reset the time. */ | |
1412 | starttime[revs[cnt].data.fd] = 0; | |
1413 | if (revs[cnt].data.fd == highest) | |
1414 | do | |
1415 | --highest; | |
1416 | while (highest > 0 && starttime[highest] == 0); | |
1417 | ||
1418 | --nused; | |
1419 | } | |
1420 | ||
1421 | /* Now look for descriptors for accepted connections which have | |
1422 | no reply in too long of a time. */ | |
1423 | time_t laststart = now - ACCEPT_TIMEOUT; | |
1424 | for (int cnt = highest; cnt > STDERR_FILENO; --cnt) | |
1425 | if (cnt != sock && starttime[cnt] != 0 && starttime[cnt] < laststart) | |
1426 | { | |
1427 | /* We are waiting for this one for too long. Close it. */ | |
1428 | struct epoll_event ev = {0, }; | |
1429 | (void) epoll_ctl (efd, EPOLL_CTL_DEL, cnt, &ev); | |
1430 | ||
1431 | (void) close (cnt); | |
1432 | ||
1433 | starttime[cnt] = 0; | |
1434 | if (cnt == highest) | |
1435 | --highest; | |
1436 | } | |
1437 | else if (cnt != sock && starttime[cnt] == 0 && cnt == highest) | |
1438 | --highest; | |
4401d759 UD |
1439 | |
1440 | if (restart_p (now)) | |
1441 | restart (); | |
fc03df7a UD |
1442 | } |
1443 | } | |
1444 | #endif | |
1445 | ||
1446 | ||
67479a70 | 1447 | /* Start all the threads we want. The initial process is thread no. 1. */ |
d67281a7 | 1448 | void |
67479a70 | 1449 | start_threads (void) |
d67281a7 | 1450 | { |
1945c96f UD |
1451 | /* Initialize the conditional variable we will use. The only |
1452 | non-standard attribute we might use is the clock selection. */ | |
1453 | pthread_condattr_t condattr; | |
1454 | pthread_condattr_init (&condattr); | |
1455 | ||
3078cba2 UD |
1456 | #if defined _POSIX_CLOCK_SELECTION && _POSIX_CLOCK_SELECTION >= 0 \ |
1457 | && defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0 | |
1945c96f UD |
1458 | /* Determine whether the monotonous clock is available. */ |
1459 | struct timespec dummy; | |
3078cba2 | 1460 | # if _POSIX_MONOTONIC_CLOCK == 0 |
94d824f9 | 1461 | if (sysconf (_SC_MONOTONIC_CLOCK) > 0) |
3078cba2 UD |
1462 | # endif |
1463 | # if _POSIX_CLOCK_SELECTION == 0 | |
94d824f9 | 1464 | if (sysconf (_SC_CLOCK_SELECTION) > 0) |
3078cba2 | 1465 | # endif |
94d824f9 UD |
1466 | if (clock_getres (CLOCK_MONOTONIC, &dummy) == 0 |
1467 | && pthread_condattr_setclock (&condattr, CLOCK_MONOTONIC) == 0) | |
1468 | timeout_clock = CLOCK_MONOTONIC; | |
1945c96f | 1469 | #endif |
d67281a7 | 1470 | |
1945c96f UD |
1471 | pthread_cond_init (&readylist_cond, &condattr); |
1472 | pthread_condattr_destroy (&condattr); | |
1473 | ||
1474 | ||
1475 | /* Create the attribute for the threads. They are all created | |
1476 | detached. */ | |
67479a70 UD |
1477 | pthread_attr_init (&attr); |
1478 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); | |
27e82856 UD |
1479 | /* Use 1MB stacks, twice as much for 64-bit architectures. */ |
1480 | pthread_attr_setstacksize (&attr, 1024 * 1024 * (sizeof (void *) / 4)); | |
d67281a7 | 1481 | |
67479a70 UD |
1482 | /* We allow less than LASTDB threads only for debugging. */ |
1483 | if (debug_level == 0) | |
1484 | nthreads = MAX (nthreads, lastdb); | |
d67281a7 | 1485 | |
27e82856 | 1486 | int nfailed = 0; |
1945c96f UD |
1487 | for (long int i = 0; i < nthreads; ++i) |
1488 | { | |
1489 | pthread_t th; | |
27e82856 UD |
1490 | if (pthread_create (&th, &attr, nscd_run, (void *) (i - nfailed)) != 0) |
1491 | ++nfailed; | |
1492 | } | |
1493 | if (nthreads - nfailed < lastdb) | |
1494 | { | |
1495 | /* We could not start enough threads. */ | |
1496 | dbg_log (_("could only start %d threads; terminating"), | |
1497 | nthreads - nfailed); | |
1498 | exit (1); | |
1945c96f | 1499 | } |
d67281a7 | 1500 | |
fc03df7a UD |
1501 | /* Determine how much room for descriptors we should initially |
1502 | allocate. This might need to change later if we cap the number | |
1503 | with MAXCONN. */ | |
1504 | const long int nfds = sysconf (_SC_OPEN_MAX); | |
1505 | #define MINCONN 32 | |
1506 | #define MAXCONN 16384 | |
1507 | if (nfds == -1 || nfds > MAXCONN) | |
1508 | nconns = MAXCONN; | |
1509 | else if (nfds < MINCONN) | |
1510 | nconns = MINCONN; | |
1511 | else | |
1512 | nconns = nfds; | |
1513 | ||
1514 | /* We need memory to pass descriptors on to the worker threads. */ | |
1515 | fdlist = (struct fdlist *) xcalloc (nconns, sizeof (fdlist[0])); | |
1516 | /* Array to keep track when connection was accepted. */ | |
1517 | starttime = (time_t *) xcalloc (nconns, sizeof (starttime[0])); | |
1518 | ||
1945c96f UD |
1519 | /* In the main thread we execute the loop which handles incoming |
1520 | connections. */ | |
fc03df7a UD |
1521 | #ifdef HAVE_EPOLL |
1522 | int efd = epoll_create (100); | |
1523 | if (efd != -1) | |
1524 | { | |
1525 | main_loop_epoll (efd); | |
1526 | close (efd); | |
1527 | } | |
1528 | #endif | |
1529 | ||
1530 | main_loop_poll (); | |
d67281a7 | 1531 | } |
057685e4 UD |
1532 | |
1533 | ||
1534 | /* Look up the uid, gid, and supplementary groups to run nscd as. When | |
1535 | this function is called, we are not listening on the nscd socket yet so | |
1536 | we can just use the ordinary lookup functions without causing a lockup */ | |
1537 | static void | |
1538 | begin_drop_privileges (void) | |
1539 | { | |
a95a08b4 | 1540 | struct passwd *pwd = getpwnam (server_user); |
057685e4 UD |
1541 | |
1542 | if (pwd == NULL) | |
1543 | { | |
1544 | dbg_log (_("Failed to run nscd as user '%s'"), server_user); | |
1545 | error (EXIT_FAILURE, 0, _("Failed to run nscd as user '%s'"), | |
1546 | server_user); | |
1547 | } | |
1548 | ||
1549 | server_uid = pwd->pw_uid; | |
1550 | server_gid = pwd->pw_gid; | |
1551 | ||
4401d759 UD |
1552 | /* Save the old UID/GID if we have to change back. */ |
1553 | if (paranoia) | |
1554 | { | |
1555 | old_uid = getuid (); | |
1556 | old_gid = getgid (); | |
1557 | } | |
1558 | ||
a95a08b4 UD |
1559 | if (getgrouplist (server_user, server_gid, NULL, &server_ngroups) == 0) |
1560 | { | |
1561 | /* This really must never happen. */ | |
1562 | dbg_log (_("Failed to run nscd as user '%s'"), server_user); | |
1563 | error (EXIT_FAILURE, errno, _("initial getgrouplist failed")); | |
1564 | } | |
057685e4 | 1565 | |
a95a08b4 | 1566 | server_groups = (gid_t *) xmalloc (server_ngroups * sizeof (gid_t)); |
057685e4 UD |
1567 | |
1568 | if (getgrouplist (server_user, server_gid, server_groups, &server_ngroups) | |
1569 | == -1) | |
1570 | { | |
1571 | dbg_log (_("Failed to run nscd as user '%s'"), server_user); | |
1572 | error (EXIT_FAILURE, errno, _("getgrouplist failed")); | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | ||
1577 | /* Call setgroups(), setgid(), and setuid() to drop root privileges and | |
1578 | run nscd as the user specified in the configuration file. */ | |
1579 | static void | |
1580 | finish_drop_privileges (void) | |
1581 | { | |
1582 | if (setgroups (server_ngroups, server_groups) == -1) | |
1583 | { | |
1584 | dbg_log (_("Failed to run nscd as user '%s'"), server_user); | |
1585 | error (EXIT_FAILURE, errno, _("setgroups failed")); | |
1586 | } | |
1587 | ||
1588 | if (setgid (server_gid) == -1) | |
1589 | { | |
1590 | dbg_log (_("Failed to run nscd as user '%s'"), server_user); | |
1591 | perror ("setgid"); | |
1592 | exit (1); | |
1593 | } | |
1594 | ||
1595 | if (setuid (server_uid) == -1) | |
1596 | { | |
1597 | dbg_log (_("Failed to run nscd as user '%s'"), server_user); | |
1598 | perror ("setuid"); | |
1599 | exit (1); | |
1600 | } | |
1601 | } |