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- Committer: Teddy Hogeborn
- Date: 2011-12-01 21:01:21 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111201210121-6zpzlxdschiv0gzc
Added sample OpenVPN network hook.
* network-hooks.d/openvpn: New.
* network-hooks.d/openvpn.conf: - '' -
* network-hooks.d/openvpn: New.
* network-hooks.d/openvpn.conf: - '' -
- files added:
- network-hooks.d
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
76
setgid(), pause(), _exit() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
90
91
91
92
#ifdef __linux__
92
93
#include <sys/klog.h> /* klogctl() */
110
111
init_gnutls_session(),
111
112
GNUTLS_* */
112
113
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
115
116
116
117
/* GPGME */
117
118
#include <gpgme.h> /* All GPGME types, constants and
133
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
135
static const char sys_class_net[] = "/sys/class/net";
135
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
136
138
137
139
/* Doubly linked list that need to be circularly linked when used */
138
140
typedef struct server{
173
175
perror(print_text);
174
176
}
175
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
176
187
/*
177
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
189
* bytes. "buffer_capacity" is how much is currently allocated,
179
190
* "buffer_length" is how much is already used.
180
191
*/
181
192
size_t incbuffer(char **buffer, size_t buffer_length,
182
size_t buffer_capacity){
193
size_t buffer_capacity){
183
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
184
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
185
196
if(buffer == NULL){
191
202
}
192
203
193
204
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
196
int af){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
197
207
int ret;
198
208
server *new_server = malloc(sizeof(server));
199
209
if(new_server == NULL){
201
211
return -1;
202
212
}
203
213
*new_server = (server){ .ip = strdup(ip),
204
.port = port,
205
.if_index = if_index,
206
.af = af };
214
.port = port,
215
.if_index = if_index,
216
.af = af };
207
217
if(new_server->ip == NULL){
208
218
perror_plus("strdup");
209
219
return -1;
231
241
/*
232
242
* Initialize GPGME.
233
243
*/
234
static bool init_gpgme(const char *seckey,
235
const char *pubkey, const char *tempdir){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
236
246
gpgme_error_t rc;
237
247
gpgme_engine_info_t engine_info;
238
248
253
263
254
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
265
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
259
268
return false;
260
269
}
261
270
262
271
rc = gpgme_op_import(mc.ctx, pgp_data);
263
272
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
267
275
return false;
268
276
}
269
277
276
284
}
277
285
278
286
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
281
288
}
282
289
283
290
/* Init GPGME */
284
291
gpgme_check_version(NULL);
285
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
293
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
290
296
return false;
291
297
}
292
298
293
299
/* Set GPGME home directory for the OpenPGP engine only */
294
300
rc = gpgme_get_engine_info(&engine_info);
295
301
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
299
304
return false;
300
305
}
301
306
while(engine_info != NULL){
307
312
engine_info = engine_info->next;
308
313
}
309
314
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
312
317
return false;
313
318
}
314
319
315
320
/* Create new GPGME "context" */
316
321
rc = gpgme_new(&(mc.ctx));
317
322
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
321
326
return false;
322
327
}
323
328
342
347
ssize_t plaintext_length = 0;
343
348
344
349
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
351
}
348
352
349
353
/* Create new GPGME data buffer from memory cryptotext */
350
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
355
0);
352
356
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
356
359
return -1;
357
360
}
358
361
359
362
/* Create new empty GPGME data buffer for the plaintext */
360
363
rc = gpgme_data_new(&dh_plain);
361
364
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
365
368
gpgme_data_release(dh_crypto);
366
369
return -1;
367
370
}
370
373
data buffer */
371
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
375
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
376
378
plaintext_length = -1;
377
379
if(debug){
378
380
gpgme_decrypt_result_t result;
379
381
result = gpgme_op_decrypt_result(mc.ctx);
380
382
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
384
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
390
389
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
391
}
394
392
gpgme_recipient_t recipient;
395
393
recipient = result->recipients;
396
394
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
406
402
recipient = recipient->next;
407
403
}
408
404
}
411
407
}
412
408
413
409
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
411
}
417
412
418
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
425
420
*plaintext = NULL;
426
421
while(true){
427
422
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
423
(size_t)plaintext_length,
424
plaintext_capacity);
430
425
if(plaintext_capacity == 0){
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
434
429
}
435
430
436
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
449
444
}
450
445
451
446
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
454
448
for(ssize_t i = 0; i < plaintext_length; i++){
455
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
450
}
478
472
/* GnuTLS log function callback */
479
473
static void debuggnutls(__attribute__((unused)) int level,
480
474
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
482
476
}
483
477
484
478
static int init_gnutls_global(const char *pubkeyfilename,
486
480
int ret;
487
481
488
482
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
484
}
492
485
493
486
ret = gnutls_global_init();
494
487
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
497
490
return -1;
498
491
}
499
492
508
501
/* OpenPGP credentials */
509
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
510
503
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
513
506
gnutls_global_deinit();
514
507
return -1;
515
508
}
516
509
517
510
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
522
515
}
523
516
524
517
ret = gnutls_certificate_set_openpgp_key_file
525
518
(mc.cred, pubkeyfilename, seckeyfilename,
526
519
GNUTLS_OPENPGP_FMT_BASE64);
527
520
if(ret != GNUTLS_E_SUCCESS){
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
534
526
goto globalfail;
535
527
}
536
528
537
529
/* GnuTLS server initialization */
538
530
ret = gnutls_dh_params_init(&mc.dh_params);
539
531
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
543
535
goto globalfail;
544
536
}
545
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
538
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
550
541
goto globalfail;
551
542
}
552
543
572
563
}
573
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
565
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
578
569
}
579
570
580
571
{
587
578
}
588
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
580
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
594
584
gnutls_deinit(*session);
595
585
return -1;
596
586
}
605
595
}
606
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
597
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
611
600
gnutls_deinit(*session);
612
601
return -1;
613
602
}
658
647
pf = PF_INET;
659
648
break;
660
649
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
651
errno = EINVAL;
664
652
return -1;
665
653
}
670
658
}
671
659
672
660
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
676
663
}
677
664
678
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
704
691
}
705
692
if(ret == 0){
706
693
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
695
errno = e;
710
696
goto mandos_end;
711
697
}
716
702
717
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
705
-Wunreachable-code*/
720
706
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
724
709
errno = EINVAL;
725
710
goto mandos_end;
726
711
}
744
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
730
perror_plus("if_indextoname");
746
731
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
750
734
}
751
735
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
754
738
}
755
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
766
750
perror_plus("inet_ntop");
767
751
} else {
768
752
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
771
754
}
772
755
}
773
756
}
801
784
while(true){
802
785
size_t out_size = strlen(out);
803
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
804
out_size - written));
787
out_size - written));
805
788
if(ret == -1){
806
789
int e = errno;
807
790
perror_plus("write");
827
810
}
828
811
829
812
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
814
}
833
815
834
816
if(quit_now){
854
836
855
837
if(ret != GNUTLS_E_SUCCESS){
856
838
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
840
gnutls_perror(ret);
860
841
}
861
842
errno = EPROTO;
865
846
/* Read OpenPGP packet that contains the wanted password */
866
847
867
848
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
870
851
}
871
852
872
853
while(true){
877
858
}
878
859
879
860
buffer_capacity = incbuffer(&buffer, buffer_length,
880
buffer_capacity);
861
buffer_capacity);
881
862
if(buffer_capacity == 0){
882
863
int e = errno;
883
864
perror_plus("incbuffer");
910
891
}
911
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
893
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
915
896
gnutls_perror(ret);
916
897
errno = EPROTO;
917
898
goto mandos_end;
918
899
}
919
900
break;
920
901
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
924
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
905
errno = EIO;
926
906
goto mandos_end;
931
911
}
932
912
933
913
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
914
fprintf_plus(stderr, "Closing TLS session\n");
936
915
}
937
916
938
917
if(quit_now){
950
929
951
930
if(buffer_length > 0){
952
931
ssize_t decrypted_buffer_size;
953
decrypted_buffer_size = pgp_packet_decrypt(buffer,
954
buffer_length,
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
955
933
&decrypted_buffer);
956
934
if(decrypted_buffer_size >= 0){
957
935
968
946
if(ret == 0 and ferror(stdout)){
969
947
int e = errno;
970
948
if(debug){
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
973
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
974
951
}
975
952
errno = e;
976
953
goto mandos_end;
1033
1010
switch(event){
1034
1011
default:
1035
1012
case AVAHI_RESOLVER_FAILURE:
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
1038
" of type '%s' in domain '%s': %s\n", name, type, domain,
1039
avahi_strerror(avahi_server_errno(mc.server)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1040
1017
break;
1041
1018
1042
1019
case AVAHI_RESOLVER_FOUND:
1044
1021
char ip[AVAHI_ADDRESS_STR_MAX];
1045
1022
avahi_address_snprint(ip, sizeof(ip), address);
1046
1023
if(debug){
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
ip, (intmax_t)interface, port);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
1051
1027
}
1052
1028
int ret = start_mandos_communication(ip, port, interface,
1053
1029
avahi_proto_to_af(proto));
1085
1061
default:
1086
1062
case AVAHI_BROWSER_FAILURE:
1087
1063
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
1090
avahi_strerror(avahi_server_errno(mc.server)));
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1091
1066
avahi_simple_poll_quit(mc.simple_poll);
1092
1067
return;
1093
1068
1100
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
1076
name, type, domain, protocol, 0,
1102
1077
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
1105
name, avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1106
1081
break;
1107
1082
1108
1083
case AVAHI_BROWSER_REMOVE:
1111
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
1112
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1113
1088
if(debug){
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
1116
1091
}
1117
1092
break;
1118
1093
}
1157
1132
/* Reject the loopback device */
1158
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
1134
if(debug){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1162
1137
}
1163
1138
return false;
1164
1139
}
1165
1140
/* Accept point-to-point devices only if connect_to is specified */
1166
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
1142
if(debug){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1170
1145
}
1171
1146
return true;
1172
1147
}
1173
1148
/* Otherwise, reject non-broadcast-capable devices */
1174
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
1150
if(debug){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1178
1153
}
1179
1154
return false;
1180
1155
}
1181
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
1157
if(ifr->ifr_flags & IFF_NOARP){
1183
1158
if(debug){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1186
1161
}
1187
1162
return false;
1188
1163
}
1189
1164
1190
1165
/* Accept this device */
1191
1166
if(debug){
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1194
1168
}
1195
1169
return true;
1196
1170
}
1208
1182
struct ifreq ifr;
1209
1183
if(not get_flags(if_entry->d_name, &ifr)){
1210
1184
if(debug){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1214
1187
}
1215
1188
return 0;
1216
1189
}
1234
1207
struct ifreq ifr;
1235
1208
if(not get_flags(if_entry->d_name, &ifr)){
1236
1209
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1240
1212
}
1241
1213
return 0;
1242
1214
}
1244
1216
/* Reject down interfaces */
1245
1217
if(not (ifr.ifr_flags & IFF_UP)){
1246
1218
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1250
1221
}
1251
1222
return 0;
1252
1223
}
1254
1225
/* Reject non-running interfaces */
1255
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
1227
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1260
1230
}
1261
1231
return 0;
1262
1232
}
1281
1251
/* Is this directory entry a runnable program? */
1282
1252
int runnable_hook(const struct dirent *direntry){
1283
1253
int ret;
1254
size_t sret;
1284
1255
struct stat st;
1285
1256
1286
1257
if((direntry->d_name)[0] == '\0'){
1288
1259
return 0;
1289
1260
}
1290
1261
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1308
1283
if(ret == -1){
1309
1284
if(debug){
1310
perror_plus("Could not stat plugin");
1285
perror_plus("Could not stat hook");
1311
1286
}
1312
1287
return 0;
1313
1288
}
1314
1289
if(not (S_ISREG(st.st_mode))){
1315
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1316
1295
return 0;
1317
1296
}
1318
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1320
1303
return 0;
1321
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1322
1309
return 1;
1323
1310
}
1324
1311
1331
1318
while(true){
1332
1319
if(mc.current_server == NULL){
1333
1320
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1336
1323
}
1337
1324
ret = avahi_simple_poll_iterate(s, -1);
1338
1325
} else {
1339
1326
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1343
1329
}
1344
1330
/* the current time */
1345
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1348
1363
1349
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1366
1352
}
1367
1353
1368
1354
if(block_time <= 0){
1395
1381
}
1396
1382
}
1397
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1509
}
1510
1398
1511
int main(int argc, char *argv[]){
1399
1512
AvahiSServiceBrowser *sb = NULL;
1400
1513
int error;
1482
1595
.arg = "SECONDS",
1483
1596
.doc = "Retry interval used when denied by the mandos server",
1484
1597
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1485
1602
/*
1486
1603
* These reproduce what we would get without ARGP_NO_HELP
1487
1604
*/
1540
1657
argp_error(state, "Bad retry interval");
1541
1658
}
1542
1659
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1662
break;
1543
1663
/*
1544
1664
* These reproduce what we would get without ARGP_NO_HELP
1545
1665
*/
1551
1671
argp_state_help(state, state->out_stream,
1552
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1553
1673
case 'V': /* --version */
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1556
1677
exit(argp_err_exit_status);
1557
1678
break;
1558
1679
default:
1585
1706
{
1586
1707
/* Work around Debian bug #633582:
1587
1708
<http://bugs.debian.org/633582> */
1588
struct stat st;
1589
1709
1590
1710
/* Re-raise priviliges */
1591
1711
errno = 0;
1592
1712
ret = seteuid(0);
1593
1713
if(ret == -1){
1594
1714
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
1653
1715
} else {
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1713
free(fullname);
1714
continue;
1715
}
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1737
1766
}
1738
1767
}
1739
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
1772
}
1773
1740
1774
if(not debug){
1741
1775
avahi_set_log_function(empty_log);
1742
1776
}
1756
1790
/* Pick the first interface returned */
1757
1791
interface = strdup(direntries[0]->d_name);
1758
1792
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1761
1794
}
1762
1795
if(interface == NULL){
1763
1796
perror_plus("malloc");
1768
1801
free(direntries);
1769
1802
} else {
1770
1803
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1773
1805
exitcode = EXIT_FAILURE;
1774
1806
goto end;
1775
1807
}
1781
1813
srand((unsigned int) time(NULL));
1782
1814
mc.simple_poll = avahi_simple_poll_new();
1783
1815
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1786
1818
exitcode = EX_UNAVAILABLE;
1787
1819
goto end;
1788
1820
}
1854
1886
if(strcmp(interface, "none") != 0){
1855
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
1888
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1859
1890
exitcode = EX_UNAVAILABLE;
1860
1891
goto end;
1861
1892
}
1981
2012
#endif /* __linux__ */
1982
2013
/* Lower privileges */
1983
2014
errno = 0;
1984
if(take_down_interface){
1985
/* Lower privileges */
1986
ret = seteuid(uid);
1987
if(ret == -1){
1988
perror_plus("seteuid");
1989
}
1990
} else {
1991
/* Lower privileges permanently */
1992
ret = setuid(uid);
1993
if(ret == -1){
1994
perror_plus("setuid");
1995
}
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
1996
2019
}
1997
2020
}
1998
2021
2002
2025
2003
2026
ret = init_gnutls_global(pubkey, seckey);
2004
2027
if(ret == -1){
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2007
2029
exitcode = EX_UNAVAILABLE;
2008
2030
goto end;
2009
2031
} else {
2025
2047
}
2026
2048
2027
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2051
exitcode = EX_UNAVAILABLE;
2031
2052
goto end;
2032
2053
} else {
2042
2063
/* (Mainly meant for debugging) */
2043
2064
char *address = strrchr(connect_to, ':');
2044
2065
if(address == NULL){
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2066
fprintf_plus(stderr, "No colon in address\n");
2047
2067
exitcode = EX_USAGE;
2048
2068
goto end;
2049
2069
}
2057
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2058
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2059
2079
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2080
fprintf_plus(stderr, "Bad port number\n");
2062
2081
exitcode = EX_USAGE;
2063
2082
goto end;
2064
2083
}
2094
2113
break;
2095
2114
}
2096
2115
if(debug){
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2099
2118
}
2100
2119
sleep((int)retry_interval);
2101
2120
}
2131
2150
2132
2151
/* Check if creating the Avahi server object succeeded */
2133
2152
if(mc.server == NULL){
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
2136
avahi_strerror(error));
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2137
2155
exitcode = EX_UNAVAILABLE;
2138
2156
goto end;
2139
2157
}
2147
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2148
2166
NULL, 0, browse_callback, NULL);
2149
2167
if(sb == NULL){
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
2152
avahi_strerror(avahi_server_errno(mc.server)));
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
2153
2170
exitcode = EX_UNAVAILABLE;
2154
2171
goto end;
2155
2172
}
2161
2178
/* Run the main loop */
2162
2179
2163
2180
if(debug){
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2166
2182
}
2167
2183
2168
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
2185
(int)(retry_interval * 1000));
2170
2186
if(debug){
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2174
2189
}
2175
2190
2176
2191
end:
2177
2192
2178
2193
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2181
2195
}
2182
2196
2183
2197
/* Cleanup things */
2199
2213
if(gpgme_initialized){
2200
2214
gpgme_release(mc.ctx);
2201
2215
}
2202
2216
2203
2217
/* Cleans up the circular linked list of Mandos servers the client
2204
2218
has seen */
2205
2219
if(mc.current_server != NULL){
2211
2225
}
2212
2226
}
2213
2227
2214
/* XXX run network hooks "stop" here */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2215
2230
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2231
/* Re-raise priviliges */
2232
{
2219
2233
errno = 0;
2220
2234
ret = seteuid(0);
2221
2235
if(ret == -1){
2222
2236
perror_plus("seteuid");
2223
2237
}
2224
if(geteuid() == 0){
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2225
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
2242
if(ret == -1){
2227
2243
perror_plus("ioctl SIOCGIFFLAGS");
2236
2252
if(ret == -1){
2237
2253
perror_plus("close");
2238
2254
}
2239
/* Lower privileges permanently */
2240
errno = 0;
2241
ret = setuid(uid);
2242
if(ret == -1){
2243
perror_plus("setuid");
2244
}
2245
2255
}
2246
2256
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2247
2263
2248
2264
/* Removes the GPGME temp directory and all files inside */
2249
2265
if(tempdir_created){
2263
2279
}
2264
2280
ret = remove(fullname);
2265
2281
if(ret == -1){
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2268
2284
}
2269
2285
free(fullname);
2270
2286
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0