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- Committer: Teddy Hogeborn
- Date: 2013-10-13 15:43:42 UTC
- Revision ID: teddy@recompile.se-20131013154342-2ztabynqog6xuk0t
* initramfs-unpack: Bug fix: Made executable.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
72
65
program_invocation_short_name */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
99
91
argz_delete(), argz_append(),
100
92
argz_stringify(), argz_add(),
101
93
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
94
105
95
#ifdef __linux__
106
96
#include <sys/klog.h> /* klogctl() */
148
138
static const char sys_class_net[] = "/sys/class/net";
149
139
char *connect_to = NULL;
150
140
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
141
uid_t uid = 65534;
153
142
gid_t gid = 65534;
154
143
191
180
perror(print_text);
192
181
}
193
182
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
195
184
int fprintf_plus(FILE *stream, const char *format, ...){
196
185
va_list ap;
197
186
va_start (ap, format);
206
195
* bytes. "buffer_capacity" is how much is currently allocated,
207
196
* "buffer_length" is how much is already used.
208
197
*/
209
__attribute__((nonnull, warn_unused_result))
210
198
size_t incbuffer(char **buffer, size_t buffer_length,
211
199
size_t buffer_capacity){
212
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
219
203
return 0;
220
204
}
221
*buffer = new_buf;
222
205
buffer_capacity += BUFFER_SIZE;
223
206
}
224
207
return buffer_capacity;
225
208
}
226
209
227
210
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
212
int af, server **current_server){
231
213
int ret;
240
222
.af = af };
241
223
if(new_server->ip == NULL){
242
224
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
225
return false;
259
226
}
260
227
/* Special case of first server */
262
229
new_server->next = new_server;
263
230
new_server->prev = new_server;
264
231
*current_server = new_server;
232
/* Place the new server last in the list */
265
233
} else {
266
/* Place the new server last in the list */
267
234
new_server->next = *current_server;
268
235
new_server->prev = (*current_server)->prev;
269
236
new_server->prev->next = new_server;
270
237
(*current_server)->prev = new_server;
271
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
272
244
return true;
273
245
}
274
246
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
279
int ret = 0;
280
if(seteuid(0) == -1){
281
ret = errno;
282
}
283
errno = old_errno;
284
return ret;
285
}
286
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
292
if(ret != 0){
293
errno = old_errno;
294
return ret;
295
}
296
if(setuid(0) == -1){
297
ret = errno;
298
}
299
errno = old_errno;
300
return ret;
301
}
302
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
307
int ret = 0;
308
if(seteuid(uid) == -1){
309
ret = errno;
310
}
311
errno = old_errno;
312
return ret;
313
}
314
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
319
int ret = 0;
320
if(setuid(uid) == -1){
321
ret = errno;
322
}
323
errno = old_errno;
324
return ret;
325
}
326
327
247
/*
328
248
* Initialize GPGME.
329
249
*/
330
__attribute__((nonnull, warn_unused_result))
331
static bool init_gpgme(const char * const seckey,
332
const char * const pubkey,
333
const char * const tempdir,
334
mandos_context *mc){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
335
252
gpgme_error_t rc;
336
253
gpgme_engine_info_t engine_info;
337
254
338
255
/*
339
256
* Helper function to insert pub and seckey to the engine keyring.
340
257
*/
341
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
342
259
int ret;
343
260
int fd;
344
261
gpgme_data_t pgp_data;
349
266
return false;
350
267
}
351
268
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
354
do {
355
{
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
358
struct tm tm;
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
361
break;
362
}
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
364
break;
365
}
366
if(debug){
367
fprintf_plus(stderr, "System clock is January 1970");
368
}
369
} else {
370
if(debug){
371
fprintf_plus(stderr, "System clock is invalid");
372
}
373
}
374
}
375
struct stat keystat;
376
ret = fstat(fd, &keystat);
377
if(ret != 0){
378
perror_plus("fstat");
379
break;
380
}
381
ret = raise_privileges();
382
if(ret != 0){
383
errno = ret;
384
perror_plus("Failed to raise privileges");
385
break;
386
}
387
if(debug){
388
fprintf_plus(stderr,
389
"Setting system clock to key file mtime");
390
}
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
394
}
395
ret = lower_privileges();
396
if(ret != 0){
397
errno = ret;
398
perror_plus("Failed to lower privileges");
399
}
400
} while(false);
401
402
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
403
270
if(rc != GPG_ERR_NO_ERROR){
404
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
279
gpgme_strsource(rc), gpgme_strerror(rc));
413
280
return false;
414
281
}
415
{
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
422
fprintf_plus(stderr,
423
"The total number of considered keys: %d\n",
424
import_result->considered);
425
fprintf_plus(stderr,
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
428
fprintf_plus(stderr,
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
443
fprintf_plus(stderr,
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
446
fprintf_plus(stderr,
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
449
fprintf_plus(stderr,
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
459
import_status->fpr);
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
464
}
465
fprintf_plus(stderr, "Key status:\n");
466
fprintf_plus(stderr,
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
470
fprintf_plus(stderr,
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
486
}
487
return false;
488
}
489
}
490
282
491
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
492
284
if(ret == -1){
493
285
perror_plus("close");
494
286
}
533
325
/* Create new GPGME "context" */
534
326
rc = gpgme_new(&(mc->ctx));
535
327
if(rc != GPG_ERR_NO_ERROR){
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
538
331
return false;
539
332
}
540
333
549
342
* Decrypt OpenPGP data.
550
343
* Returns -1 on error
551
344
*/
552
__attribute__((nonnull, warn_unused_result))
553
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
554
346
size_t crypto_size,
555
347
char **plaintext,
576
368
/* Create new empty GPGME data buffer for the plaintext */
577
369
rc = gpgme_data_new(&dh_plain);
578
370
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
580
373
gpgme_strsource(rc), gpgme_strerror(rc));
581
374
gpgme_data_release(dh_crypto);
582
375
return -1;
595
388
if(result == NULL){
596
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
597
390
} else {
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
601
}
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
604
395
if(result->file_name != NULL){
605
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
606
397
}
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
610
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
613
405
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
615
409
}
616
410
}
617
411
}
673
467
return plaintext_length;
674
468
}
675
469
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
678
if(str == NULL)
679
return "(unknown)";
680
return str;
681
}
682
683
__attribute__((warn_unused_result))
684
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
685
471
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
687
475
}
688
476
689
477
/* GnuTLS log function callback */
690
__attribute__((nonnull))
691
478
static void debuggnutls(__attribute__((unused)) int level,
692
479
const char* string){
693
480
fprintf_plus(stderr, "GnuTLS: %s", string);
694
481
}
695
482
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
697
483
static int init_gnutls_global(const char *pubkeyfilename,
698
484
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
485
mandos_context *mc){
701
486
int ret;
702
unsigned int uret;
703
487
704
488
if(debug){
705
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
706
490
}
707
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
708
499
if(debug){
709
500
/* "Use a log level over 10 to enable all debugging options."
710
501
* - GnuTLS manual
718
509
if(ret != GNUTLS_E_SUCCESS){
719
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
721
513
return -1;
722
514
}
723
515
748
540
safer_gnutls_strerror(ret));
749
541
goto globalfail;
750
542
}
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
754
do {
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
756
if(dhpfile == -1){
757
perror_plus("open");
758
dhparamsfilename = NULL;
759
break;
760
}
761
size_t params_capacity = 0;
762
while(true){
763
params_capacity = incbuffer((char **)¶ms.data,
764
(size_t)params.size,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
768
free(params.data);
769
params.data = NULL;
770
dhparamsfilename = NULL;
771
break;
772
}
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
775
BUFFER_SIZE);
776
/* EOF */
777
if(bytes_read == 0){
778
break;
779
}
780
/* check bytes_read for failure */
781
if(bytes_read < 0){
782
perror_plus("read");
783
free(params.data);
784
params.data = NULL;
785
dhparamsfilename = NULL;
786
break;
787
}
788
params.size += (unsigned int)bytes_read;
789
}
790
ret = close(dhpfile);
791
if(ret == -1){
792
perror_plus("close");
793
}
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
796
}
797
if(dhparamsfilename == NULL){
798
break;
799
}
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
807
}
808
free(params.data);
809
} while(false);
810
}
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
816
do {
817
int secfile = open(seckeyfilename, O_RDONLY);
818
if(secfile == -1){
819
perror_plus("open");
820
break;
821
}
822
size_t buffer_capacity = 0;
823
while(true){
824
buffer_capacity = incbuffer((char **)&buffer.data,
825
(size_t)buffer.size,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
829
free(buffer.data);
830
buffer.data = NULL;
831
break;
832
}
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
835
BUFFER_SIZE);
836
/* EOF */
837
if(bytes_read == 0){
838
break;
839
}
840
/* check bytes_read for failure */
841
if(bytes_read < 0){
842
perror_plus("read");
843
free(buffer.data);
844
buffer.data = NULL;
845
break;
846
}
847
buffer.size += (unsigned int)bytes_read;
848
}
849
close(secfile);
850
} while(false);
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
854
{
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
859
" structure: %s",
860
safer_gnutls_strerror(ret));
861
free(buffer.data);
862
buffer.data = NULL;
863
} else {
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
869
privkey = NULL;
870
}
871
free(buffer.data);
872
buffer.data = NULL;
873
if(privkey != NULL){
874
/* Use private key to suggest an appropriate
875
sec_param */
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
878
if(debug){
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
882
(sec_param)));
883
}
884
}
885
}
886
}
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
890
if(debug){
891
fprintf_plus(stderr, "Falling back to security parameter"
892
" \"%s\"\n",
893
safe_string(gnutls_sec_param_get_name
894
(sec_param)));
895
}
896
}
897
}
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
if(uret != 0){
900
mc->dh_bits = uret;
901
if(debug){
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)),
906
mc->dh_bits);
907
}
908
} else {
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
912
(sec_param)),
913
safer_gnutls_strerror(ret));
914
goto globalfail;
915
}
916
} else if(debug){
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
mc->dh_bits);
919
}
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
925
goto globalfail;
926
}
927
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
928
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
929
551
930
552
return 0;
932
554
globalfail:
933
555
934
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
935
558
gnutls_dh_params_deinit(mc->dh_params);
936
559
return -1;
937
560
}
938
561
939
__attribute__((nonnull, warn_unused_result))
940
562
static int init_gnutls_session(gnutls_session_t *session,
941
563
mandos_context *mc){
942
564
int ret;
989
611
/* ignore client certificate if any. */
990
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
991
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
992
616
return 0;
993
617
}
994
618
996
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
997
621
__attribute__((unused)) const char *txt){}
998
622
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1004
int ret;
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1011
if(debug){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1014
}
1015
return false;
1016
}
1017
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1021
return false;
1022
}
1023
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1025
if(devnull == -1){
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1027
return false;
1028
}
1029
pid_t pid = fork();
1030
if(pid == 0){
1031
/* Child */
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1034
if(errno != 0){
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1037
} else {
1038
/* Set group */
1039
errno = 0;
1040
ret = setgid(0);
1041
if(ret == -1){
1042
perror_plus("setgid");
1043
_exit(EX_NOPERM);
1044
}
1045
/* Reset supplementary groups */
1046
errno = 0;
1047
ret = setgroups(0, NULL);
1048
if(ret == -1){
1049
perror_plus("setgroups");
1050
_exit(EX_NOPERM);
1051
}
1052
}
1053
ret = dup2(devnull, STDIN_FILENO);
1054
if(ret == -1){
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1056
_exit(EX_OSERR);
1057
}
1058
ret = close(devnull);
1059
if(ret == -1){
1060
perror_plus("close");
1061
_exit(EX_OSERR);
1062
}
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
if(ret == -1){
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1066
_exit(EX_OSERR);
1067
}
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1069
O_RDONLY
1070
| O_DIRECTORY
1071
| O_PATH
1072
| O_CLOEXEC));
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1076
}
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1078
helper, O_RDONLY));
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1083
}
1084
close(helperdir_fd);
1085
#ifdef __GNUC__
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1088
#endif
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1092
environ) == -1){
1093
#ifdef __GNUC__
1094
#pragma GCC diagnostic pop
1095
#endif
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1098
}
1099
}
1100
if(pid == -1){
1101
perror_plus("fork");
1102
return false;
1103
}
1104
int status;
1105
pid_t pret = -1;
1106
errno = 0;
1107
do {
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1115
}
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1118
}
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1121
" helper program");
1122
}
1123
return false;
1124
}
1125
} while(pret == -1 and errno == EINTR);
1126
if(pret == -1){
1127
perror_plus("waitpid");
1128
return false;
1129
}
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1134
return false;
1135
}
1136
return true;
1137
}
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1141
return false;
1142
}
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1144
return false;
1145
}
1146
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1150
if(debug){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1152
}
1153
return add_delete_local_route(true, address, if_index);
1154
}
1155
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1159
if(debug){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1161
}
1162
return add_delete_local_route(false, address, if_index);
1163
}
1164
1165
623
/* Called when a Mandos server is found */
1166
__attribute__((nonnull, warn_unused_result))
1167
624
static int start_mandos_communication(const char *ip, in_port_t port,
1168
625
AvahiIfIndex if_index,
1169
626
int af, mandos_context *mc){
1170
627
int ret, tcp_sd = -1;
1171
628
ssize_t sret;
1172
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1173
633
char *buffer = NULL;
1174
634
char *decrypted_buffer = NULL;
1175
635
size_t buffer_length = 0;
1178
638
int retval = -1;
1179
639
gnutls_session_t session;
1180
640
int pf; /* Protocol family */
1181
bool route_added = false;
1182
641
1183
642
errno = 0;
1184
643
1206
665
bool match = false;
1207
666
{
1208
667
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1212
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
671
match = true;
1214
672
break;
1243
701
PRIuMAX "\n", ip, (uintmax_t)port);
1244
702
}
1245
703
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1247
705
if(tcp_sd < 0){
1248
706
int e = errno;
1249
707
perror_plus("socket");
1256
714
goto mandos_end;
1257
715
}
1258
716
717
memset(&to, 0, sizeof(to));
1259
718
if(af == AF_INET6){
1260
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1261
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1262
ret = inet_pton(af, ip, &to6->sin6_addr);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1263
721
} else { /* IPv4 */
1264
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1265
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1266
ret = inet_pton(af, ip, &to4->sin_addr);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1267
724
}
1268
725
if(ret < 0 ){
1269
726
int e = errno;
1278
735
goto mandos_end;
1279
736
}
1280
737
if(af == AF_INET6){
1281
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1282
if(IN6_IS_ADDR_LINKLOCAL
1283
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
1284
742
if(if_index == AVAHI_IF_UNSPEC){
1285
743
fprintf_plus(stderr, "An IPv6 link-local address is"
1286
744
" incomplete without a network interface\n");
1288
746
goto mandos_end;
1289
747
}
1290
748
/* Set the network interface number as scope */
1291
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1292
750
}
1293
751
} else {
1294
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1295
755
}
1296
756
1297
757
if(quit_now){
1314
774
}
1315
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1316
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1317
if(af == AF_INET6){
1318
ret = getnameinfo((struct sockaddr *)&to,
1319
sizeof(struct sockaddr_in6),
1320
addrstr, sizeof(addrstr), NULL, 0,
1321
NI_NUMERICHOST);
1322
} else {
1323
ret = getnameinfo((struct sockaddr *)&to,
1324
sizeof(struct sockaddr_in),
1325
addrstr, sizeof(addrstr), NULL, 0,
1326
NI_NUMERICHOST);
1327
}
1328
if(ret == EAI_SYSTEM){
1329
perror_plus("getnameinfo");
1330
} else if(ret != 0) {
1331
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1332
} else if(strcmp(addrstr, ip) != 0){
1333
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1334
}
1335
}
1336
1337
if(quit_now){
1338
errno = EINTR;
1339
goto mandos_end;
1340
}
1341
1342
while(true){
1343
if(af == AF_INET6){
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1346
} else {
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1349
}
1350
if(ret < 0){
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1357
&to)->sin6_addr)))
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1368
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1372
*/
1373
if(debug){
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1375
" direct route\n");
1376
}
1377
int e = errno;
1378
route_added = add_local_route(ip, if_index);
1379
if(route_added){
1380
continue;
1381
}
1382
errno = e;
1383
}
1384
if(errno != ECONNREFUSED or debug){
1385
int e = errno;
1386
perror_plus("connect");
1387
errno = e;
1388
}
1389
goto mandos_end;
1390
}
1391
1392
if(quit_now){
1393
errno = EINTR;
1394
goto mandos_end;
1395
}
1396
break;
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1397
816
}
1398
817
1399
818
const char *out = mandos_protocol_version;
1553
972
&decrypted_buffer, mc);
1554
973
if(decrypted_buffer_size >= 0){
1555
974
1556
clearerr(stdout);
1557
975
written = 0;
1558
976
while(written < (size_t) decrypted_buffer_size){
1559
977
if(quit_now){
1575
993
}
1576
994
written += (size_t)ret;
1577
995
}
1578
ret = fflush(stdout);
1579
if(ret != 0){
1580
int e = errno;
1581
if(debug){
1582
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1583
strerror(errno));
1584
}
1585
errno = e;
1586
goto mandos_end;
1587
}
1588
996
retval = 0;
1589
997
}
1590
998
}
1593
1001
1594
1002
mandos_end:
1595
1003
{
1596
if(route_added){
1597
if(not delete_local_route(ip, if_index)){
1598
fprintf_plus(stderr, "Failed to delete local route to %s on"
1599
" interface %d", ip, if_index);
1600
}
1601
}
1602
1004
int e = errno;
1603
1005
free(decrypted_buffer);
1604
1006
free(buffer);
1605
1007
if(tcp_sd >= 0){
1606
ret = close(tcp_sd);
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1607
1009
}
1608
1010
if(ret == -1){
1609
1011
if(e == 0){
1634
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1635
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1636
1038
flags,
1637
void *mc){
1039
void* mc){
1638
1040
if(r == NULL){
1639
1041
return;
1640
1042
}
1643
1045
timed out */
1644
1046
1645
1047
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1647
1048
return;
1648
1049
}
1649
1050
1694
1095
const char *domain,
1695
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1696
1097
flags,
1697
void *mc){
1098
void* mc){
1698
1099
if(b == NULL){
1699
1100
return;
1700
1101
}
1760
1161
errno = old_errno;
1761
1162
}
1762
1163
1763
__attribute__((nonnull, warn_unused_result))
1764
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1765
1165
int ret;
1766
int old_errno;
1166
error_t ret_errno;
1767
1167
1768
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1769
1169
if(s < 0){
1770
old_errno = errno;
1170
ret_errno = errno;
1771
1171
perror_plus("socket");
1772
errno = old_errno;
1172
errno = ret_errno;
1773
1173
return false;
1774
1174
}
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1175
strcpy(ifr->ifr_name, ifname);
1777
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1778
1177
if(ret == -1){
1779
1178
if(debug){
1780
old_errno = errno;
1179
ret_errno = errno;
1781
1180
perror_plus("ioctl SIOCGIFFLAGS");
1782
errno = old_errno;
1783
}
1784
if((close(s) == -1) and debug){
1785
old_errno = errno;
1786
perror_plus("close");
1787
errno = old_errno;
1181
errno = ret_errno;
1788
1182
}
1789
1183
return false;
1790
1184
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1796
1185
return true;
1797
1186
}
1798
1187
1799
__attribute__((nonnull, warn_unused_result))
1800
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1801
1189
1802
1190
/* Reject the loopback device */
1844
1232
* corresponds to an acceptable network device.
1845
1233
* (This function is passed to scandir(3) as a filter function.)
1846
1234
*/
1847
__attribute__((nonnull, warn_unused_result))
1848
1235
int good_interface(const struct dirent *if_entry){
1849
1236
if(if_entry->d_name[0] == '.'){
1850
1237
return 0;
1868
1255
/*
1869
1256
* This function determines if a network interface is up.
1870
1257
*/
1871
__attribute__((nonnull, warn_unused_result))
1872
1258
bool interface_is_up(const char *interface){
1873
1259
struct ifreq ifr;
1874
1260
if(not get_flags(interface, &ifr)){
1885
1271
/*
1886
1272
* This function determines if a network interface is running
1887
1273
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
1274
bool interface_is_running(const char *interface){
1890
1275
struct ifreq ifr;
1891
1276
if(not get_flags(interface, &ifr)){
1899
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1900
1285
}
1901
1286
1902
__attribute__((nonnull, pure, warn_unused_result))
1903
1287
int notdotentries(const struct dirent *direntry){
1904
1288
/* Skip "." and ".." */
1905
1289
if(direntry->d_name[0] == '.'
1912
1296
}
1913
1297
1914
1298
/* Is this directory entry a runnable program? */
1915
__attribute__((nonnull, warn_unused_result))
1916
1299
int runnable_hook(const struct dirent *direntry){
1917
1300
int ret;
1918
1301
size_t sret;
1926
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1927
1310
"abcdefghijklmnopqrstuvwxyz"
1928
1311
"0123456789"
1929
"_.-");
1312
"_-");
1930
1313
if((direntry->d_name)[sret] != '\0'){
1931
1314
/* Contains non-allowed characters */
1932
1315
if(debug){
1936
1319
return 0;
1937
1320
}
1938
1321
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1940
1330
if(ret == -1){
1941
1331
if(debug){
1942
1332
perror_plus("Could not stat hook");
1966
1356
return 1;
1967
1357
}
1968
1358
1969
__attribute__((nonnull, warn_unused_result))
1970
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
1360
mandos_context *mc){
1972
1361
int ret;
1976
1365
1977
1366
while(true){
1978
1367
if(mc->current_server == NULL){
1979
if(debug){
1368
if (debug){
1980
1369
fprintf_plus(stderr, "Wait until first server is found."
1981
1370
" No timeout!\n");
1982
1371
}
1983
1372
ret = avahi_simple_poll_iterate(s, -1);
1984
1373
} else {
1985
if(debug){
1374
if (debug){
1986
1375
fprintf_plus(stderr, "Check current_server if we should run"
1987
1376
" it, or wait\n");
1988
1377
}
2005
1394
- ((intmax_t)waited_time.tv_sec * 1000))
2006
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
2007
1396
2008
if(debug){
1397
if (debug){
2009
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2010
1399
block_time);
2011
1400
}
2033
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
2034
1423
}
2035
1424
if(ret != 0){
2036
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
2037
1426
return (ret != 1) ? ret : 0;
2038
1427
}
2039
1428
}
2040
1429
}
2041
1430
}
2042
1431
2043
__attribute__((nonnull))
2044
void run_network_hooks(const char *mode, const char *interface,
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
2045
1485
const float delay){
2046
struct dirent **direntries = NULL;
2047
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
2050
if(hookdir_fd == -1){
2051
if(errno == ENOENT){
2052
if(debug){
2053
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2054
" found\n", hookdir);
2055
}
2056
} else {
2057
perror_plus("open");
2058
}
2059
return;
2060
}
2061
}
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2063
if(devnull == -1){
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2065
return;
2066
}
2067
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
runnable_hook, alphasort);
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
2069
1491
if(numhooks == -1){
2070
perror_plus("scandir");
2071
close(devnull);
2072
return;
2073
}
2074
struct dirent *direntry;
2075
int ret;
2076
for(int i = 0; i < numhooks; i++){
2077
direntry = direntries[i];
2078
if(debug){
2079
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2080
direntry->d_name);
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
2081
1499
}
2082
pid_t hook_pid = fork();
2083
if(hook_pid == 0){
2084
/* Child */
2085
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2087
if(errno != 0){
2088
perror_plus("Failed to raise privileges");
2089
_exit(EX_NOPERM);
2090
}
2091
/* Set group */
2092
errno = 0;
2093
ret = setgid(0);
2094
if(ret == -1){
2095
perror_plus("setgid");
2096
_exit(EX_NOPERM);
2097
}
2098
/* Reset supplementary groups */
2099
errno = 0;
2100
ret = setgroups(0, NULL);
2101
if(ret == -1){
2102
perror_plus("setgroups");
2103
_exit(EX_NOPERM);
2104
}
2105
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
if(ret == -1){
2107
perror_plus("setenv");
2108
_exit(EX_OSERR);
2109
}
2110
ret = setenv("DEVICE", interface, 1);
2111
if(ret == -1){
2112
perror_plus("setenv");
2113
_exit(EX_OSERR);
2114
}
2115
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2116
if(ret == -1){
2117
perror_plus("setenv");
2118
_exit(EX_OSERR);
2119
}
2120
ret = setenv("MODE", mode, 1);
2121
if(ret == -1){
2122
perror_plus("setenv");
2123
_exit(EX_OSERR);
2124
}
2125
char *delaystring;
2126
ret = asprintf(&delaystring, "%f", (double)delay);
2127
if(ret == -1){
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
2128
1507
perror_plus("asprintf");
2129
_exit(EX_OSERR);
2130
}
2131
ret = setenv("DELAY", delaystring, 1);
2132
if(ret == -1){
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
2133
1566
free(delaystring);
2134
perror_plus("setenv");
2135
_exit(EX_OSERR);
2136
}
2137
free(delaystring);
2138
if(connect_to != NULL){
2139
ret = setenv("CONNECT", connect_to, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
}
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2146
direntry->d_name,
2147
O_RDONLY));
2148
if(hook_fd == -1){
2149
perror_plus("openat");
2150
_exit(EXIT_FAILURE);
2151
}
2152
if(close(hookdir_fd) == -1){
2153
perror_plus("close");
2154
_exit(EXIT_FAILURE);
2155
}
2156
ret = dup2(devnull, STDIN_FILENO);
2157
if(ret == -1){
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2159
_exit(EX_OSERR);
2160
}
2161
ret = close(devnull);
2162
if(ret == -1){
2163
perror_plus("close");
2164
_exit(EX_OSERR);
2165
}
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2167
if(ret == -1){
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2169
_exit(EX_OSERR);
2170
}
2171
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2172
environ) == -1){
2173
perror_plus("fexecve");
2174
_exit(EXIT_FAILURE);
2175
}
2176
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
int status;
2183
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
perror_plus("waitpid");
2185
free(direntry);
2186
continue;
2187
}
2188
if(WIFEXITED(status)){
2189
if(WEXITSTATUS(status) != 0){
2190
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
" with status %d\n", direntry->d_name,
2192
WEXITSTATUS(status));
2193
free(direntry);
2194
continue;
2195
}
2196
} else if(WIFSIGNALED(status)){
2197
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
" signal %d\n", direntry->d_name,
2199
WTERMSIG(status));
2200
free(direntry);
2201
continue;
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
2202
1578
} else {
2203
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
continue;
2207
}
2208
}
2209
if(debug){
2210
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
direntry->d_name);
2212
}
2213
free(direntry);
2214
}
2215
free(direntries);
2216
if(close(hookdir_fd) == -1){
2217
perror_plus("close");
2218
} else {
2219
hookdir_fd = -1;
2220
}
2221
close(devnull);
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
2222
1615
}
2223
1616
2224
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
2228
int ret;
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2229
1623
struct ifreq network;
2230
1624
unsigned int if_index = if_nametoindex(interface);
2231
1625
if(if_index == 0){
2240
1634
}
2241
1635
2242
1636
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
2246
1638
ret_errno = errno;
2247
1639
fprintf_plus(stderr, "Failed to get flags for interface "
2248
1640
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
1641
return ret_errno;
2251
1642
}
2252
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
2253
1644
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2256
1647
ret_errno = errno;
2257
1648
perror_plus("socket");
2258
1649
errno = old_errno;
2259
1650
return ret_errno;
2260
1651
}
2261
1652
2262
1653
if(quit_now){
2263
ret = close(sd);
2264
if(ret == -1){
2265
perror_plus("close");
2266
}
1654
close(sd);
2267
1655
errno = old_errno;
2268
1656
return EINTR;
2269
1657
}
2273
1661
interface);
2274
1662
}
2275
1663
2276
/* Raise privileges */
2277
ret_errno = raise_privileges();
2278
if(ret_errno != 0){
2279
errno = ret_errno;
2280
perror_plus("Failed to raise privileges");
2281
}
1664
/* Raise priviliges */
1665
raise_privileges();
2282
1666
2283
1667
#ifdef __linux__
2284
int ret_linux;
2285
bool restore_loglevel = false;
2286
if(ret_errno == 0){
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2288
messages about the network interface to mess up the prompt */
2289
ret_linux = klogctl(8, NULL, 5);
2290
if(ret_linux == -1){
2291
perror_plus("klogctl");
2292
} else {
2293
restore_loglevel = true;
2294
}
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
2295
1675
}
2296
1676
#endif /* __linux__ */
2297
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2298
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2299
1679
#ifdef __linux__
2300
1680
if(restore_loglevel){
2301
1681
ret_linux = klogctl(7, NULL, 0);
2305
1685
}
2306
1686
#endif /* __linux__ */
2307
1687
2308
/* If raise_privileges() succeeded above */
2309
if(ret_errno == 0){
2310
/* Lower privileges */
2311
ret_errno = lower_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to lower privileges");
2315
}
2316
}
1688
/* Lower privileges */
1689
lower_privileges();
2317
1690
2318
1691
/* Close the socket */
2319
ret = close(sd);
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2320
1693
if(ret == -1){
2321
1694
perror_plus("close");
2322
1695
}
2323
1696
2324
1697
if(ret_setflags == -1){
2325
errno = ioctl_errno;
1698
errno = ret_errno;
2326
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2327
1700
errno = old_errno;
2328
return ioctl_errno;
1701
return ret_errno;
2329
1702
}
2330
1703
} else if(debug){
2331
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2334
1707
2335
1708
/* Sleep checking until interface is running.
2336
1709
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
1710
for(int i=0; i < delay * 4; i++){
2338
1711
if(interface_is_running(interface)){
2339
1712
break;
2340
1713
}
2349
1722
return 0;
2350
1723
}
2351
1724
2352
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2355
1730
struct ifreq network;
2356
1731
unsigned int if_index = if_nametoindex(interface);
2357
1732
if(if_index == 0){
2360
1735
return ENXIO;
2361
1736
}
2362
1737
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
2365
1738
if(not get_flags(interface, &network) and debug){
2366
1739
ret_errno = errno;
2367
1740
fprintf_plus(stderr, "Failed to get flags for interface "
2368
1741
"\"%s\"\n", interface);
2369
errno = old_errno;
2370
1742
return ret_errno;
2371
1743
}
2372
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2373
1745
2374
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2375
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2376
1748
ret_errno = errno;
2377
1749
perror_plus("socket");
2378
1750
errno = old_errno;
2384
1756
interface);
2385
1757
}
2386
1758
2387
/* Raise privileges */
2388
ret_errno = raise_privileges();
2389
if(ret_errno != 0){
2390
errno = ret_errno;
2391
perror_plus("Failed to raise privileges");
2392
}
2393
2394
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2395
ioctl_errno = errno;
2396
2397
/* If raise_privileges() succeeded above */
2398
if(ret_errno == 0){
2399
/* Lower privileges */
2400
ret_errno = lower_privileges();
2401
if(ret_errno != 0){
2402
errno = ret_errno;
2403
perror_plus("Failed to lower privileges");
2404
}
2405
}
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2406
1767
2407
1768
/* Close the socket */
2408
int ret = close(sd);
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2409
1770
if(ret == -1){
2410
1771
perror_plus("close");
2411
1772
}
2412
1773
2413
1774
if(ret_setflags == -1){
2414
errno = ioctl_errno;
1775
errno = ret_errno;
2415
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2416
1777
errno = old_errno;
2417
return ioctl_errno;
1778
return ret_errno;
2418
1779
}
2419
1780
} else if(debug){
2420
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2426
1787
}
2427
1788
2428
1789
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
2434
1794
AvahiSServiceBrowser *sb = NULL;
2435
1795
error_t ret_errno;
2436
1796
int ret;
2439
1799
int exitcode = EXIT_SUCCESS;
2440
1800
char *interfaces_to_take_down = NULL;
2441
1801
size_t interfaces_to_take_down_size = 0;
2442
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2443
char old_tempdir[] = "/tmp/mandosXXXXXX";
2444
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2445
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2446
1805
const char *seckey = PATHDIR "/" SECKEY;
2447
1806
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
2450
1809
2451
1810
bool gnutls_initialized = false;
2452
1811
bool gpgme_initialized = false;
2504
1863
.doc = "Bit length of the prime number used in the"
2505
1864
" Diffie-Hellman key exchange",
2506
1865
.group = 2 },
2507
{ .name = "dh-params", .key = 134,
2508
.arg = "FILE",
2509
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2510
" for the Diffie-Hellman key exchange",
2511
.group = 2 },
2512
1866
{ .name = "priority", .key = 130,
2513
1867
.arg = "STRING",
2514
1868
.doc = "GnuTLS priority string for the TLS handshake",
2569
1923
}
2570
1924
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2571
1925
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
2575
1926
case 130: /* --priority */
2576
1927
mc.priority = arg;
2577
1928
break;
2617
1968
.args_doc = "",
2618
1969
.doc = "Mandos client -- Get and decrypt"
2619
1970
" passwords from a Mandos server" };
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2623
1974
case 0:
2624
1975
break;
2625
1976
case ENOMEM:
2626
1977
default:
2627
errno = ret_errno;
1978
errno = ret;
2628
1979
perror_plus("argp_parse");
2629
1980
exitcode = EX_OSERR;
2630
1981
goto end;
2633
1984
goto end;
2634
1985
}
2635
1986
}
2636
1987
2637
1988
{
2638
1989
/* Work around Debian bug #633582:
2639
<https://bugs.debian.org/633582> */
1990
<http://bugs.debian.org/633582> */
2640
1991
2641
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2645
perror_plus("Failed to raise privileges");
2646
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2647
1994
struct stat st;
2648
1995
2649
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2663
2010
}
2664
2011
}
2665
2012
}
2666
close(seckey_fd);
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2667
2014
}
2668
2015
}
2669
2016
2670
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2672
2019
if(pubkey_fd == -1){
2684
2031
}
2685
2032
}
2686
2033
}
2687
close(pubkey_fd);
2688
}
2689
}
2690
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2696
} else {
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2698
if(ret == -1){
2699
perror_plus("fstat");
2700
} else {
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2704
if(ret == -1){
2705
perror_plus("fchown");
2706
}
2707
}
2708
}
2709
close(dhparams_fd);
2710
}
2711
}
2712
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2713
2038
/* Lower privileges */
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to lower privileges");
2718
}
2039
lower_privileges();
2719
2040
}
2720
2041
}
2721
2042
2745
2066
goto end;
2746
2067
}
2747
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2749
}
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2752
2077
}
2753
2078
2754
2079
if(not debug){
2832
2157
2833
2158
/* If no interfaces were specified, make a list */
2834
2159
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2160
struct dirent **direntries;
2836
2161
/* Look for any good interfaces */
2837
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2838
2163
alphasort);
2842
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2843
2168
direntries[i]->d_name);
2844
2169
if(ret_errno != 0){
2845
errno = ret_errno;
2846
2170
perror_plus("argz_add");
2847
free(direntries[i]);
2848
2171
continue;
2849
2172
}
2850
2173
if(debug){
2851
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
2175
direntries[i]->d_name);
2853
2176
}
2854
free(direntries[i]);
2855
2177
}
2856
2178
free(direntries);
2857
2179
} else {
2858
if(ret == 0){
2859
free(direntries);
2860
}
2180
free(direntries);
2861
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2862
2182
exitcode = EXIT_FAILURE;
2863
2183
goto end;
2886
2206
break;
2887
2207
}
2888
2208
bool interface_was_up = interface_is_up(interface);
2889
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2890
2210
if(not interface_was_up){
2891
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2894
2214
} else {
2895
errno = argz_add(&interfaces_to_take_down,
2896
&interfaces_to_take_down_size,
2897
interface);
2898
if(errno != 0){
2899
perror_plus("argz_add");
2900
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2901
2218
}
2902
2219
}
2903
2220
}
2919
2236
goto end;
2920
2237
}
2921
2238
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2923
2240
if(ret == -1){
2924
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2925
2242
exitcode = EX_UNAVAILABLE;
2932
2249
goto end;
2933
2250
}
2934
2251
2935
/* Try /run/tmp before /tmp */
2936
tempdir = mkdtemp(run_tempdir);
2937
if(tempdir == NULL and errno == ENOENT){
2938
if(debug){
2939
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2940
run_tempdir, old_tempdir);
2941
}
2942
tempdir = mkdtemp(old_tempdir);
2943
}
2944
if(tempdir == NULL){
2252
if(mkdtemp(tempdir) == NULL){
2945
2253
perror_plus("mkdtemp");
2946
2254
goto end;
2947
2255
}
2256
tempdir_created = true;
2948
2257
2949
2258
if(quit_now){
2950
2259
goto end;
3025
2334
sleep((unsigned int)retry_interval);
3026
2335
}
3027
2336
3028
if(not quit_now){
2337
if (not quit_now){
3029
2338
exitcode = EXIT_SUCCESS;
3030
2339
}
3031
2340
3047
2356
3048
2357
/* Allocate a new server */
3049
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
2359
&config, NULL, NULL, &ret_errno);
3051
2360
3052
2361
/* Free the Avahi configuration data */
3053
2362
avahi_server_config_free(&config);
3056
2365
/* Check if creating the Avahi server object succeeded */
3057
2366
if(mc.server == NULL){
3058
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
2368
avahi_strerror(ret_errno));
3060
2369
exitcode = EX_UNAVAILABLE;
3061
2370
goto end;
3062
2371
}
3086
2395
if(debug){
3087
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
3088
2397
}
3089
2398
3090
2399
ret = avahi_loop_with_timeout(simple_poll,
3091
2400
(int)(retry_interval * 1000), &mc);
3092
2401
if(debug){
3097
2406
end:
3098
2407
3099
2408
if(debug){
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3104
} else {
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3106
}
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3107
2410
}
3108
2411
3109
2412
/* Cleanup things */
3120
2423
3121
2424
if(gnutls_initialized){
3122
2425
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
3123
2427
gnutls_dh_params_deinit(mc.dh_params);
3124
2428
}
3125
2429
3133
2437
mc.current_server->prev->next = NULL;
3134
2438
while(mc.current_server != NULL){
3135
2439
server *next = mc.current_server->next;
3136
#ifdef __GNUC__
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3139
#endif
3140
free((char *)(mc.current_server->ip));
3141
#ifdef __GNUC__
3142
#pragma GCC diagnostic pop
3143
#endif
3144
2440
free(mc.current_server);
3145
2441
mc.current_server = next;
3146
2442
}
3147
2443
}
3148
2444
3149
/* Re-raise privileges */
2445
/* Re-raise priviliges */
3150
2446
{
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
3154
perror_plus("Failed to raise privileges");
3155
} else {
3156
3157
/* Run network hooks */
3158
run_network_hooks("stop", interfaces_hooks != NULL ?
3159
interfaces_hooks : "", delay);
3160
3161
/* Take down the network interfaces which were brought up */
3162
{
3163
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3166
interface))){
3167
ret = take_down_interface(interface);
3168
if(ret != 0){
3169
errno = ret;
3170
perror_plus("Failed to take down interface");
3171
}
3172
}
3173
if(debug and (interfaces_to_take_down == NULL)){
3174
fprintf_plus(stderr, "No interfaces needed to be taken"
3175
" down\n");
3176
}
3177
}
3178
}
3179
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
3183
perror_plus("Failed to lower privileges permanently");
3184
}
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
3185
2472
}
3186
2473
3187
2474
free(interfaces_to_take_down);
3188
2475
free(interfaces_hooks);
3189
2476
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
2477
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
3192
2479
struct dirent **direntries = NULL;
3193
int dret;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3195
O_RDONLY
3196
| O_NOFOLLOW
3197
| O_DIRECTORY
3198
| O_PATH));
3199
if(dir_fd == -1){
3200
perror_plus("open");
3201
return;
3202
}
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
3206
2484
for(int i = 0; i < numentries; i++){
3207
if(debug){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3210
}
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3212
if(dret == -1){
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3215
AT_REMOVEDIR);
3216
}
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3222
dret = 0;
3223
}
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3227
}
3228
}
3229
free(direntries[i]);
3230
}
3231
3232
/* need to clean even if 0 because man page doesn't specify */
3233
free(direntries);
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3237
}
3238
} else {
3239
perror_plus("scandirat");
3240
}
3241
close(dir_fd);
3242
}
3243
3244
/* Removes the GPGME temp directory and all files inside */
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
3247
2511
}
3248
2512
3249
2513
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0