To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 505.1.27
- compare with another revision
- download diff
- download tarball
- view history from revision 505.1.27
- Committer: teddy at bsnet
- Date: 2011-12-24 19:43:26 UTC
- mto: This revision was merged to the branch mainline in revision 531.
- Revision ID: teddy@fukt.bsnet.se-20111224194326-egfeyd0140t03xmf
* plugins.d/mandos-client.c (add_server): Return bool; all callers
changed.
(resolve_callback): Check return value from add_server().
(main/parse_opt): Bug fix; Remove extra message on --version.
changed.
(resolve_callback): Check return value from add_server().
(main/parse_opt): Bug fix; Remove extra message on --version.
- files added:
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
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
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
88
91
89
92
#ifdef __linux__
90
93
#include <sys/klog.h> /* klogctl() */
108
111
init_gnutls_session(),
109
112
GNUTLS_* */
110
113
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
113
116
114
117
/* GPGME */
115
118
#include <gpgme.h> /* All GPGME types, constants and
123
126
#define PATHDIR "/conf/conf.d/mandos"
124
127
#define SECKEY "seckey.txt"
125
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
130
127
131
bool debug = false;
128
132
static const char mandos_protocol_version[] = "1";
130
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
135
static const char sys_class_net[] = "/sys/class/net";
132
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
133
138
134
139
/* Doubly linked list that need to be circularly linked when used */
135
140
typedef struct server{
170
175
perror(print_text);
171
176
}
172
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
173
187
/*
174
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
189
* bytes. "buffer_capacity" is how much is currently allocated,
176
190
* "buffer_length" is how much is already used.
177
191
*/
178
192
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
193
size_t buffer_capacity){
180
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
196
if(buffer == NULL){
188
202
}
189
203
190
204
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
194
207
int ret;
195
208
server *new_server = malloc(sizeof(server));
196
209
if(new_server == NULL){
197
210
perror_plus("malloc");
198
return -1;
211
return false;
199
212
}
200
213
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
214
.port = port,
215
.if_index = if_index,
216
.af = af };
204
217
if(new_server->ip == NULL){
205
218
perror_plus("strdup");
206
return -1;
219
return false;
207
220
}
208
221
/* Special case of first server */
209
222
if (mc.current_server == NULL){
220
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
234
if(ret == -1){
222
235
perror_plus("clock_gettime");
223
return -1;
236
return false;
224
237
}
225
return 0;
238
return true;
226
239
}
227
240
228
241
/*
229
242
* Initialize GPGME.
230
243
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
233
246
gpgme_error_t rc;
234
247
gpgme_engine_info_t engine_info;
235
248
250
263
251
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
265
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
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));
255
268
return false;
256
269
}
257
270
258
271
rc = gpgme_op_import(mc.ctx, pgp_data);
259
272
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
262
275
return false;
263
276
}
264
277
271
284
}
272
285
273
286
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
275
288
}
276
289
277
290
/* Init GPGME */
278
291
gpgme_check_version(NULL);
279
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
293
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
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));
283
296
return false;
284
297
}
285
298
286
299
/* Set GPGME home directory for the OpenPGP engine only */
287
300
rc = gpgme_get_engine_info(&engine_info);
288
301
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
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));
291
304
return false;
292
305
}
293
306
while(engine_info != NULL){
299
312
engine_info = engine_info->next;
300
313
}
301
314
if(engine_info == NULL){
302
fprintf(stderr, "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);
303
317
return false;
304
318
}
305
319
306
320
/* Create new GPGME "context" */
307
321
rc = gpgme_new(&(mc.ctx));
308
322
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), 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));
311
326
return false;
312
327
}
313
328
332
347
ssize_t plaintext_length = 0;
333
348
334
349
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
351
}
337
352
338
353
/* Create new GPGME data buffer from memory cryptotext */
339
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
355
0);
341
356
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
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));
344
359
return -1;
345
360
}
346
361
347
362
/* Create new empty GPGME data buffer for the plaintext */
348
363
rc = gpgme_data_new(&dh_plain);
349
364
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
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));
352
368
gpgme_data_release(dh_crypto);
353
369
return -1;
354
370
}
357
373
data buffer */
358
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
375
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
362
378
plaintext_length = -1;
363
379
if(debug){
364
380
gpgme_decrypt_result_t result;
365
381
result = gpgme_op_decrypt_result(mc.ctx);
366
382
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
384
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
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);
373
389
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
391
}
376
392
gpgme_recipient_t recipient;
377
393
recipient = result->recipients;
378
394
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "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");
385
402
recipient = recipient->next;
386
403
}
387
404
}
390
407
}
391
408
392
409
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
411
}
395
412
396
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
420
*plaintext = NULL;
404
421
while(true){
405
422
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
423
(size_t)plaintext_length,
424
plaintext_capacity);
408
425
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
412
429
}
413
430
414
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
444
}
428
445
429
446
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
431
448
for(ssize_t i = 0; i < plaintext_length; i++){
432
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
450
}
455
472
/* GnuTLS log function callback */
456
473
static void debuggnutls(__attribute__((unused)) int level,
457
474
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
459
476
}
460
477
461
478
static int init_gnutls_global(const char *pubkeyfilename,
463
480
int ret;
464
481
465
482
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
484
}
468
485
469
486
ret = gnutls_global_init();
470
487
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
473
490
return -1;
474
491
}
475
492
484
501
/* OpenPGP credentials */
485
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
503
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
489
506
gnutls_global_deinit();
490
507
return -1;
491
508
}
492
509
493
510
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
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);
497
515
}
498
516
499
517
ret = gnutls_certificate_set_openpgp_key_file
500
518
(mc.cred, pubkeyfilename, seckeyfilename,
501
519
GNUTLS_OPENPGP_FMT_BASE64);
502
520
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
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));
508
526
goto globalfail;
509
527
}
510
528
511
529
/* GnuTLS server initialization */
512
530
ret = gnutls_dh_params_init(&mc.dh_params);
513
531
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
516
535
goto globalfail;
517
536
}
518
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
538
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
522
541
goto globalfail;
523
542
}
524
543
544
563
}
545
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
565
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
549
569
}
550
570
551
571
{
558
578
}
559
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
580
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
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));
564
584
gnutls_deinit(*session);
565
585
return -1;
566
586
}
575
595
}
576
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
597
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
580
600
gnutls_deinit(*session);
581
601
return -1;
582
602
}
627
647
pf = PF_INET;
628
648
break;
629
649
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
651
errno = EINVAL;
632
652
return -1;
633
653
}
638
658
}
639
659
640
660
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
643
663
}
644
664
645
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
691
}
672
692
if(ret == 0){
673
693
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
695
errno = e;
676
696
goto mandos_end;
677
697
}
682
702
683
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
705
-Wunreachable-code*/
686
706
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
689
709
errno = EINVAL;
690
710
goto mandos_end;
691
711
}
709
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
730
perror_plus("if_indextoname");
711
731
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
714
734
}
715
735
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
718
738
}
719
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
750
perror_plus("inet_ntop");
731
751
} else {
732
752
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
754
}
735
755
}
736
756
}
764
784
while(true){
765
785
size_t out_size = strlen(out);
766
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
787
out_size - written));
768
788
if(ret == -1){
769
789
int e = errno;
770
790
perror_plus("write");
790
810
}
791
811
792
812
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
814
}
795
815
796
816
if(quit_now){
816
836
817
837
if(ret != GNUTLS_E_SUCCESS){
818
838
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
840
gnutls_perror(ret);
821
841
}
822
842
errno = EPROTO;
826
846
/* Read OpenPGP packet that contains the wanted password */
827
847
828
848
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
831
851
}
832
852
833
853
while(true){
838
858
}
839
859
840
860
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
861
buffer_capacity);
842
862
if(buffer_capacity == 0){
843
863
int e = errno;
844
864
perror_plus("incbuffer");
871
891
}
872
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
893
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
875
896
gnutls_perror(ret);
876
897
errno = EPROTO;
877
898
goto mandos_end;
878
899
}
879
900
break;
880
901
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
883
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
905
errno = EIO;
885
906
goto mandos_end;
890
911
}
891
912
892
913
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
914
fprintf_plus(stderr, "Closing TLS session\n");
894
915
}
895
916
896
917
if(quit_now){
908
929
909
930
if(buffer_length > 0){
910
931
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
913
933
&decrypted_buffer);
914
934
if(decrypted_buffer_size >= 0){
915
935
926
946
if(ret == 0 and ferror(stdout)){
927
947
int e = errno;
928
948
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
931
951
}
932
952
errno = e;
933
953
goto mandos_end;
990
1010
switch(event){
991
1011
default:
992
1012
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
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)));
996
1017
break;
997
1018
998
1019
case AVAHI_RESOLVER_FOUND:
1000
1021
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1022
avahi_address_snprint(ip, sizeof(ip), address);
1002
1023
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
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);
1006
1027
}
1007
1028
int ret = start_mandos_communication(ip, port, interface,
1008
1029
avahi_proto_to_af(proto));
1009
1030
if(ret == 0){
1010
1031
avahi_simple_poll_quit(mc.simple_poll);
1011
1032
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1036
" list\n", name);
1037
}
1014
1038
}
1015
1039
}
1016
1040
}
1040
1064
default:
1041
1065
case AVAHI_BROWSER_FAILURE:
1042
1066
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1045
1069
avahi_simple_poll_quit(mc.simple_poll);
1046
1070
return;
1047
1071
1054
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
1079
name, type, domain, protocol, 0,
1056
1080
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1082
" %s\n", name,
1083
avahi_strerror(avahi_server_errno(mc.server)));
1059
1084
break;
1060
1085
1061
1086
case AVAHI_BROWSER_REMOVE:
1064
1089
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1090
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1091
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1092
fprintf_plus(stderr, "No Mandos server found, still"
1093
" searching...\n");
1068
1094
}
1069
1095
break;
1070
1096
}
1085
1111
errno = old_errno;
1086
1112
}
1087
1113
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1115
int ret;
1116
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1118
if(s < 0){
1119
perror_plus("socket");
1120
return false;
1121
}
1122
strcpy(ifr->ifr_name, ifname);
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1124
if(ret == -1){
1144
1125
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1126
perror_plus("ioctl SIOCGIFFLAGS");
1147
1127
}
1148
free(flagstring);
1149
return 0;
1128
return false;
1150
1129
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1130
return true;
1131
}
1132
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1134
1153
1135
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1136
if(ifr->ifr_flags & IFF_LOOPBACK){
1155
1137
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1138
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
ifname);
1158
1140
}
1159
return 0;
1141
return false;
1160
1142
}
1161
1143
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1144
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1163
1145
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1146
fprintf_plus(stderr, "Accepting point-to-point interface"
1147
" \"%s\"\n", ifname);
1166
1148
}
1167
return 1;
1149
return true;
1168
1150
}
1169
1151
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1152
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1171
1153
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1154
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1155
" \"%s\"\n", ifname);
1174
1156
}
1175
return 0;
1157
return false;
1176
1158
}
1177
1159
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1160
if(ifr->ifr_flags & IFF_NOARP){
1179
1161
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1162
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1163
ifname);
1182
1164
}
1183
return 0;
1165
return false;
1184
1166
}
1167
1185
1168
/* Accept this device */
1186
1169
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1170
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1171
}
1172
return true;
1173
}
1174
1175
/*
1176
* This function determines if a directory entry in /sys/class/net
1177
* corresponds to an acceptable network device.
1178
* (This function is passed to scandir(3) as a filter function.)
1179
*/
1180
int good_interface(const struct dirent *if_entry){
1181
if(if_entry->d_name[0] == '.'){
1182
return 0;
1183
}
1184
1185
struct ifreq ifr;
1186
if(not get_flags(if_entry->d_name, &ifr)){
1187
if(debug){
1188
fprintf_plus(stderr, "Failed to get flags for interface "
1189
"\"%s\"\n", if_entry->d_name);
1190
}
1191
return 0;
1192
}
1193
1194
if(not good_flags(if_entry->d_name, &ifr)){
1195
return 0;
1196
}
1197
return 1;
1198
}
1199
1200
/*
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1189
1239
}
1190
1240
return 1;
1191
1241
}
1201
1251
return 1;
1202
1252
}
1203
1253
1254
/* Is this directory entry a runnable program? */
1255
int runnable_hook(const struct dirent *direntry){
1256
int ret;
1257
size_t sret;
1258
struct stat st;
1259
1260
if((direntry->d_name)[0] == '\0'){
1261
/* Empty name? */
1262
return 0;
1263
}
1264
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
"abcdefghijklmnopqrstuvwxyz"
1267
"0123456789"
1268
"_-");
1269
if((direntry->d_name)[sret] != '\0'){
1270
/* Contains non-allowed characters */
1271
if(debug){
1272
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1273
direntry->d_name);
1274
}
1275
return 0;
1276
}
1277
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1286
if(ret == -1){
1287
if(debug){
1288
perror_plus("Could not stat hook");
1289
}
1290
return 0;
1291
}
1292
if(not (S_ISREG(st.st_mode))){
1293
/* Not a regular file */
1294
if(debug){
1295
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
direntry->d_name);
1297
}
1298
return 0;
1299
}
1300
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1301
/* Not executable */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(debug){
1309
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1310
direntry->d_name);
1311
}
1312
return 1;
1313
}
1314
1204
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
1316
int ret;
1206
1317
struct timespec now;
1210
1321
while(true){
1211
1322
if(mc.current_server == NULL){
1212
1323
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1324
fprintf_plus(stderr, "Wait until first server is found."
1325
" No timeout!\n");
1215
1326
}
1216
1327
ret = avahi_simple_poll_iterate(s, -1);
1217
1328
} else {
1218
1329
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1330
fprintf_plus(stderr, "Check current_server if we should run"
1331
" it, or wait\n");
1221
1332
}
1222
1333
/* the current time */
1223
1334
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1239
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1351
1241
1352
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
block_time);
1243
1355
}
1244
1356
1245
1357
if(block_time <= 0){
1265
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1378
}
1267
1379
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1380
if (ret > 0 or errno != EINTR){
1269
1381
return (ret != 1) ? ret : 0;
1270
1382
}
1271
1383
}
1272
1384
}
1273
1385
}
1274
1386
1387
bool run_network_hooks(const char *mode, const char *interface,
1388
const float delay){
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1394
if(numhooks == -1){
1395
perror_plus("scandir");
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1403
perror_plus("asprintf");
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1472
free(delaystring);
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1512
}
1513
1275
1514
int main(int argc, char *argv[]){
1276
1515
AvahiSServiceBrowser *sb = NULL;
1277
1516
int error;
1359
1598
.arg = "SECONDS",
1360
1599
.doc = "Retry interval used when denied by the mandos server",
1361
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1362
1605
/*
1363
1606
* These reproduce what we would get without ARGP_NO_HELP
1364
1607
*/
1417
1660
argp_error(state, "Bad retry interval");
1418
1661
}
1419
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
break;
1420
1666
/*
1421
1667
* These reproduce what we would get without ARGP_NO_HELP
1422
1668
*/
1428
1674
argp_state_help(state, state->out_stream,
1429
1675
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1676
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1677
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1678
exit(argp_err_exit_status);
1433
1679
break;
1434
1680
default:
1461
1707
{
1462
1708
/* Work around Debian bug #633582:
1463
1709
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1710
1466
1711
/* Re-raise priviliges */
1467
1712
errno = 0;
1468
1713
ret = seteuid(0);
1469
1714
if(ret == -1){
1470
1715
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1716
} else {
1717
struct stat st;
1718
1719
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1720
int seckey_fd = open(seckey, O_RDONLY);
1721
if(seckey_fd == -1){
1722
perror_plus("open");
1723
} else {
1724
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
if(ret == -1){
1726
perror_plus("fstat");
1727
} else {
1728
if(S_ISREG(st.st_mode)
1729
and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode)
1750
and st.st_uid == 0 and st.st_gid == 0){
1751
ret = fchown(pubkey_fd, uid, gid);
1752
if(ret == -1){
1753
perror_plus("fchown");
1754
}
1755
}
1756
}
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1758
}
1759
}
1760
1761
/* Lower privileges */
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
1766
}
1767
}
1768
}
1769
1770
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
1519
1773
}
1520
1774
1521
1775
if(not debug){
1522
1776
avahi_set_log_function(empty_log);
1523
1777
}
1524
1778
1525
1779
if(interface[0] == '\0'){
1526
1780
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1528
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1529
1790
if(ret >= 1){
1530
/* Pick the first good interface */
1791
/* Pick the first interface returned */
1531
1792
interface = strdup(direntries[0]->d_name);
1532
1793
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1534
1795
}
1535
1796
if(interface == NULL){
1536
1797
perror_plus("malloc");
1541
1802
free(direntries);
1542
1803
} else {
1543
1804
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1545
1806
exitcode = EXIT_FAILURE;
1546
1807
goto end;
1547
1808
}
1553
1814
srand((unsigned int) time(NULL));
1554
1815
mc.simple_poll = avahi_simple_poll_new();
1555
1816
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1817
fprintf_plus(stderr,
1818
"Avahi: Failed to create simple poll object.\n");
1557
1819
exitcode = EX_UNAVAILABLE;
1558
1820
goto end;
1559
1821
}
1625
1887
if(strcmp(interface, "none") != 0){
1626
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1889
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1629
1891
exitcode = EX_UNAVAILABLE;
1630
1892
goto end;
1631
1893
}
1751
2013
#endif /* __linux__ */
1752
2014
/* Lower privileges */
1753
2015
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
1766
2020
}
1767
2021
}
1768
2022
1772
2026
1773
2027
ret = init_gnutls_global(pubkey, seckey);
1774
2028
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2030
exitcode = EX_UNAVAILABLE;
1777
2031
goto end;
1778
2032
} else {
1794
2048
}
1795
2049
1796
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2051
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2052
exitcode = EX_UNAVAILABLE;
1799
2053
goto end;
1800
2054
} else {
1810
2064
/* (Mainly meant for debugging) */
1811
2065
char *address = strrchr(connect_to, ':');
1812
2066
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2067
fprintf_plus(stderr, "No colon in address\n");
1814
2068
exitcode = EX_USAGE;
1815
2069
goto end;
1816
2070
}
1824
2078
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
2080
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2081
fprintf_plus(stderr, "Bad port number\n");
1828
2082
exitcode = EX_USAGE;
1829
2083
goto end;
1830
2084
}
1860
2114
break;
1861
2115
}
1862
2116
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2118
(int)retry_interval);
1865
2119
}
1866
2120
sleep((int)retry_interval);
1867
2121
}
1869
2123
if (not quit_now){
1870
2124
exitcode = EXIT_SUCCESS;
1871
2125
}
1872
2126
1873
2127
goto end;
1874
2128
}
1875
2129
1897
2151
1898
2152
/* Check if creating the Avahi server object succeeded */
1899
2153
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2155
avahi_strerror(error));
1902
2156
exitcode = EX_UNAVAILABLE;
1903
2157
goto end;
1904
2158
}
1912
2166
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
2167
NULL, 0, browse_callback, NULL);
1914
2168
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2170
avahi_strerror(avahi_server_errno(mc.server)));
1917
2171
exitcode = EX_UNAVAILABLE;
1918
2172
goto end;
1919
2173
}
1925
2179
/* Run the main loop */
1926
2180
1927
2181
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2183
}
1930
2184
1931
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
2186
(int)(retry_interval * 1000));
1933
2187
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2189
(ret == 0) ? "successfully" : "with error");
1936
2190
}
1937
2191
1938
2192
end:
1939
2193
1940
2194
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2195
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2196
}
1943
2197
1944
2198
/* Cleanup things */
1960
2214
if(gpgme_initialized){
1961
2215
gpgme_release(mc.ctx);
1962
2216
}
1963
2217
1964
2218
/* Cleans up the circular linked list of Mandos servers the client
1965
2219
has seen */
1966
2220
if(mc.current_server != NULL){
1972
2226
}
1973
2227
}
1974
2228
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2233
{
1978
2234
errno = 0;
1979
2235
ret = seteuid(0);
1980
2236
if(ret == -1){
1981
2237
perror_plus("seteuid");
1982
2238
}
1983
if(geteuid() == 0){
2239
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
1984
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
2243
if(ret == -1){
1986
2244
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
2245
} else if(network.ifr_flags & IFF_UP){
1988
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
2248
if(ret == -1){
1995
2253
if(ret == -1){
1996
2254
perror_plus("close");
1997
2255
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
2256
}
2005
2257
}
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2006
2264
2007
2265
/* Removes the GPGME temp directory and all files inside */
2008
2266
if(tempdir_created){
2022
2280
}
2023
2281
ret = remove(fullname);
2024
2282
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
2027
2285
}
2028
2286
free(fullname);
2029
2287
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0