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- Committer: Teddy Hogeborn
- Date: 2011-12-31 23:00:36 UTC
- Revision ID: teddy@recompile.se-20111231230036-dokyri4qljllv7ro
* mandos: Break some long lines.
(ClientDBus.Timeout_dbus_property): If changed, only reschedule
timeout if enabled.
(ClientDBus.Timeout_dbus_property): If changed, only reschedule
timeout if enabled.
- 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
131
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
135
static const char sys_class_net[] = "/sys/class/net";
133
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
134
138
135
139
/* Doubly linked list that need to be circularly linked when used */
136
140
typedef struct server{
166
170
167
171
/* Function to use when printing errors */
168
172
void perror_plus(const char *print_text){
173
int e = errno;
169
174
fprintf(stderr, "Mandos plugin %s: ",
170
175
program_invocation_short_name);
176
errno = e;
171
177
perror(print_text);
172
178
}
173
179
180
__attribute__((format (gnu_printf, 2, 3)))
174
181
int fprintf_plus(FILE *stream, const char *format, ...){
175
182
va_list ap;
176
183
va_start (ap, format);
177
184
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
179
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
188
}
181
189
185
193
* "buffer_length" is how much is already used.
186
194
*/
187
195
size_t incbuffer(char **buffer, size_t buffer_length,
188
size_t buffer_capacity){
196
size_t buffer_capacity){
189
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
190
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
191
199
if(buffer == NULL){
197
205
}
198
206
199
207
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
203
210
int ret;
204
211
server *new_server = malloc(sizeof(server));
205
212
if(new_server == NULL){
206
213
perror_plus("malloc");
207
return -1;
214
return false;
208
215
}
209
216
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
217
.port = port,
218
.if_index = if_index,
219
.af = af };
213
220
if(new_server->ip == NULL){
214
221
perror_plus("strdup");
215
return -1;
222
return false;
216
223
}
217
224
/* Special case of first server */
218
225
if (mc.current_server == NULL){
229
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
237
if(ret == -1){
231
238
perror_plus("clock_gettime");
232
return -1;
239
return false;
233
240
}
234
return 0;
241
return true;
235
242
}
236
243
237
244
/*
238
245
* Initialize GPGME.
239
246
*/
240
static bool init_gpgme(const char *seckey,
241
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
242
249
gpgme_error_t rc;
243
250
gpgme_engine_info_t engine_info;
244
251
259
266
260
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
261
268
if(rc != GPG_ERR_NO_ERROR){
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
264
271
return false;
265
272
}
266
273
267
274
rc = gpgme_op_import(mc.ctx, pgp_data);
268
275
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
271
278
return false;
272
279
}
273
280
280
287
}
281
288
282
289
if(debug){
283
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
284
291
}
285
292
286
293
/* Init GPGME */
287
294
gpgme_check_version(NULL);
288
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
289
296
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
292
299
return false;
293
300
}
294
301
295
302
/* Set GPGME home directory for the OpenPGP engine only */
296
303
rc = gpgme_get_engine_info(&engine_info);
297
304
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
300
307
return false;
301
308
}
302
309
while(engine_info != NULL){
308
315
engine_info = engine_info->next;
309
316
}
310
317
if(engine_info == NULL){
311
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
312
320
return false;
313
321
}
314
322
315
323
/* Create new GPGME "context" */
316
324
rc = gpgme_new(&(mc.ctx));
317
325
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
320
329
return false;
321
330
}
322
331
341
350
ssize_t plaintext_length = 0;
342
351
343
352
if(debug){
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
354
}
346
355
347
356
/* Create new GPGME data buffer from memory cryptotext */
348
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
349
358
0);
350
359
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
353
362
return -1;
354
363
}
355
364
356
365
/* Create new empty GPGME data buffer for the plaintext */
357
366
rc = gpgme_data_new(&dh_plain);
358
367
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
361
371
gpgme_data_release(dh_crypto);
362
372
return -1;
363
373
}
366
376
data buffer */
367
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
368
378
if(rc != GPG_ERR_NO_ERROR){
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
371
381
plaintext_length = -1;
372
382
if(debug){
373
383
gpgme_decrypt_result_t result;
374
384
result = gpgme_op_decrypt_result(mc.ctx);
375
385
if(result == NULL){
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
377
387
} else {
378
fprintf(stderr, "Unsupported algorithm: %s\n",
379
result->unsupported_algorithm);
380
fprintf(stderr, "Wrong key usage: %u\n",
381
result->wrong_key_usage);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
382
392
if(result->file_name != NULL){
383
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
384
394
}
385
395
gpgme_recipient_t recipient;
386
396
recipient = result->recipients;
387
397
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
394
405
recipient = recipient->next;
395
406
}
396
407
}
399
410
}
400
411
401
412
if(debug){
402
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
403
414
}
404
415
405
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
412
423
*plaintext = NULL;
413
424
while(true){
414
425
plaintext_capacity = incbuffer(plaintext,
415
(size_t)plaintext_length,
416
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
417
428
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
419
plaintext_length = -1;
420
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
421
432
}
422
433
423
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
447
}
437
448
438
449
if(debug){
439
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
440
451
for(ssize_t i = 0; i < plaintext_length; i++){
441
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
442
453
}
464
475
/* GnuTLS log function callback */
465
476
static void debuggnutls(__attribute__((unused)) int level,
466
477
const char* string){
467
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
468
479
}
469
480
470
481
static int init_gnutls_global(const char *pubkeyfilename,
472
483
int ret;
473
484
474
485
if(debug){
475
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
476
487
}
477
488
478
489
ret = gnutls_global_init();
479
490
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
482
493
return -1;
483
494
}
484
495
493
504
/* OpenPGP credentials */
494
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
495
506
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
498
509
gnutls_global_deinit();
499
510
return -1;
500
511
}
501
512
502
513
if(debug){
503
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
504
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
505
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
506
518
}
507
519
508
520
ret = gnutls_certificate_set_openpgp_key_file
509
521
(mc.cred, pubkeyfilename, seckeyfilename,
510
522
GNUTLS_OPENPGP_FMT_BASE64);
511
523
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr,
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
515
fprintf(stderr, "The GnuTLS error is: %s\n",
516
safer_gnutls_strerror(ret));
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
517
529
goto globalfail;
518
530
}
519
531
520
532
/* GnuTLS server initialization */
521
533
ret = gnutls_dh_params_init(&mc.dh_params);
522
534
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
525
538
goto globalfail;
526
539
}
527
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
528
541
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
531
544
goto globalfail;
532
545
}
533
546
553
566
}
554
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
555
568
if(ret != GNUTLS_E_SUCCESS){
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
558
572
}
559
573
560
574
{
567
581
}
568
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
569
583
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Syntax error at: %s\n", err);
571
fprintf(stderr, "GnuTLS error: %s\n",
572
safer_gnutls_strerror(ret));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
573
587
gnutls_deinit(*session);
574
588
return -1;
575
589
}
584
598
}
585
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
600
if(ret != GNUTLS_E_SUCCESS){
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
589
603
gnutls_deinit(*session);
590
604
return -1;
591
605
}
636
650
pf = PF_INET;
637
651
break;
638
652
default:
639
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
654
errno = EINVAL;
641
655
return -1;
642
656
}
647
661
}
648
662
649
663
if(debug){
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
652
666
}
653
667
654
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
680
694
}
681
695
if(ret == 0){
682
696
int e = errno;
683
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
698
errno = e;
685
699
goto mandos_end;
686
700
}
691
705
692
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
708
-Wunreachable-code*/
695
709
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
698
712
errno = EINVAL;
699
713
goto mandos_end;
700
714
}
718
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
733
perror_plus("if_indextoname");
720
734
} else {
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
723
737
}
724
738
} else {
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
727
741
}
728
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
729
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
739
753
perror_plus("inet_ntop");
740
754
} else {
741
755
if(strcmp(addrstr, ip) != 0){
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
743
757
}
744
758
}
745
759
}
773
787
while(true){
774
788
size_t out_size = strlen(out);
775
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
776
out_size - written));
790
out_size - written));
777
791
if(ret == -1){
778
792
int e = errno;
779
793
perror_plus("write");
799
813
}
800
814
801
815
if(debug){
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
803
817
}
804
818
805
819
if(quit_now){
825
839
826
840
if(ret != GNUTLS_E_SUCCESS){
827
841
if(debug){
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
829
843
gnutls_perror(ret);
830
844
}
831
845
errno = EPROTO;
835
849
/* Read OpenPGP packet that contains the wanted password */
836
850
837
851
if(debug){
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
839
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
840
854
}
841
855
842
856
while(true){
847
861
}
848
862
849
863
buffer_capacity = incbuffer(&buffer, buffer_length,
850
buffer_capacity);
864
buffer_capacity);
851
865
if(buffer_capacity == 0){
852
866
int e = errno;
853
867
perror_plus("incbuffer");
880
894
}
881
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
896
if(ret < 0){
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
884
899
gnutls_perror(ret);
885
900
errno = EPROTO;
886
901
goto mandos_end;
887
902
}
888
903
break;
889
904
default:
890
fprintf(stderr, "Unknown error while reading data from"
891
" encrypted session with Mandos server\n");
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
892
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
908
errno = EIO;
894
909
goto mandos_end;
899
914
}
900
915
901
916
if(debug){
902
fprintf(stderr, "Closing TLS session\n");
917
fprintf_plus(stderr, "Closing TLS session\n");
903
918
}
904
919
905
920
if(quit_now){
917
932
918
933
if(buffer_length > 0){
919
934
ssize_t decrypted_buffer_size;
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
buffer_length,
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
922
936
&decrypted_buffer);
923
937
if(decrypted_buffer_size >= 0){
924
938
935
949
if(ret == 0 and ferror(stdout)){
936
950
int e = errno;
937
951
if(debug){
938
fprintf(stderr, "Error writing encrypted data: %s\n",
939
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
940
954
}
941
955
errno = e;
942
956
goto mandos_end;
999
1013
switch(event){
1000
1014
default:
1001
1015
case AVAHI_RESOLVER_FAILURE:
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
1004
avahi_strerror(avahi_server_errno(mc.server)));
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1005
1020
break;
1006
1021
1007
1022
case AVAHI_RESOLVER_FOUND:
1009
1024
char ip[AVAHI_ADDRESS_STR_MAX];
1010
1025
avahi_address_snprint(ip, sizeof(ip), address);
1011
1026
if(debug){
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
1015
1030
}
1016
1031
int ret = start_mandos_communication(ip, port, interface,
1017
1032
avahi_proto_to_af(proto));
1018
1033
if(ret == 0){
1019
1034
avahi_simple_poll_quit(mc.simple_poll);
1020
1035
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1023
1041
}
1024
1042
}
1025
1043
}
1049
1067
default:
1050
1068
case AVAHI_BROWSER_FAILURE:
1051
1069
1052
fprintf(stderr, "(Avahi browser) %s\n",
1053
avahi_strerror(avahi_server_errno(mc.server)));
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1054
1072
avahi_simple_poll_quit(mc.simple_poll);
1055
1073
return;
1056
1074
1063
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
1082
name, type, domain, protocol, 0,
1065
1083
resolve_callback, NULL) == NULL)
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1068
1087
break;
1069
1088
1070
1089
case AVAHI_BROWSER_REMOVE:
1073
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
1074
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1075
1094
if(debug){
1076
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1077
1097
}
1078
1098
break;
1079
1099
}
1118
1138
/* Reject the loopback device */
1119
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
1140
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1123
1143
}
1124
1144
return false;
1125
1145
}
1126
1146
/* Accept point-to-point devices only if connect_to is specified */
1127
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
1148
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1131
1151
}
1132
1152
return true;
1133
1153
}
1134
1154
/* Otherwise, reject non-broadcast-capable devices */
1135
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
1156
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1139
1159
}
1140
1160
return false;
1141
1161
}
1142
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
1163
if(ifr->ifr_flags & IFF_NOARP){
1144
1164
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1146
1167
}
1147
1168
return false;
1148
1169
}
1149
1170
1150
1171
/* Accept this device */
1151
1172
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1153
1174
}
1154
1175
return true;
1155
1176
}
1160
1181
* (This function is passed to scandir(3) as a filter function.)
1161
1182
*/
1162
1183
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
1184
if(if_entry->d_name[0] == '.'){
1165
1185
return 0;
1166
1186
}
1187
1167
1188
struct ifreq ifr;
1168
1169
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1170
1194
return 0;
1171
1195
}
1172
1196
1182
1206
* (This function is passed to scandir(3) as a filter function.)
1183
1207
*/
1184
1208
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
1209
if(if_entry->d_name[0] == '.'){
1188
1210
return 0;
1189
1211
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1253
1222
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1286
1242
}
1287
1243
return 1;
1288
1244
}
1301
1257
/* Is this directory entry a runnable program? */
1302
1258
int runnable_hook(const struct dirent *direntry){
1303
1259
int ret;
1260
size_t sret;
1304
1261
struct stat st;
1305
1262
1306
1263
if((direntry->d_name)[0] == '\0'){
1308
1265
return 0;
1309
1266
}
1310
1267
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1328
1289
if(ret == -1){
1329
1290
if(debug){
1330
perror_plus("Could not stat plugin");
1291
perror_plus("Could not stat hook");
1331
1292
}
1332
1293
return 0;
1333
1294
}
1334
if(not (st.st_mode & S_ISREG)){
1295
if(not (S_ISREG(st.st_mode))){
1335
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1336
1301
return 0;
1337
1302
}
1338
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1340
1309
return 0;
1341
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1342
1315
return 1;
1343
1316
}
1344
1317
1351
1324
while(true){
1352
1325
if(mc.current_server == NULL){
1353
1326
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1356
1329
}
1357
1330
ret = avahi_simple_poll_iterate(s, -1);
1358
1331
} else {
1359
1332
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1362
1335
}
1363
1336
/* the current time */
1364
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1380
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1354
1382
1355
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1384
1358
}
1385
1359
1386
1360
if(block_time <= 0){
1406
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
1381
}
1408
1382
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1383
if (ret > 0 or errno != EINTR){
1410
1384
return (ret != 1) ? ret : 0;
1411
1385
}
1412
1386
}
1413
1387
}
1414
1388
}
1415
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
1416
1526
int main(int argc, char *argv[]){
1417
1527
AvahiSServiceBrowser *sb = NULL;
1418
1528
int error;
1498
1608
.group = 2 },
1499
1609
{ .name = "retry", .key = 132,
1500
1610
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1502
1616
.group = 2 },
1503
1617
/*
1504
1618
* These reproduce what we would get without ARGP_NO_HELP
1558
1672
argp_error(state, "Bad retry interval");
1559
1673
}
1560
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1561
1678
/*
1562
1679
* These reproduce what we would get without ARGP_NO_HELP
1563
1680
*/
1569
1686
argp_state_help(state, state->out_stream,
1570
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
1688
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1573
1690
exit(argp_err_exit_status);
1574
1691
break;
1575
1692
default:
1602
1719
{
1603
1720
/* Work around Debian bug #633582:
1604
1721
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1722
1607
1723
/* Re-raise priviliges */
1608
1724
errno = 0;
1609
1725
ret = seteuid(0);
1610
1726
if(ret == -1){
1611
1727
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1659
1779
}
1660
1780
}
1661
1781
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
1693
goto end;
1694
}
1695
}
1696
close(devnull);
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1697
1785
}
1698
1786
1699
1787
if(not debug){
1702
1790
1703
1791
if(interface[0] == '\0'){
1704
1792
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1706
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1707
1802
if(ret >= 1){
1708
/* Pick the first good interface */
1803
/* Pick the first interface returned */
1709
1804
interface = strdup(direntries[0]->d_name);
1710
1805
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1712
1807
}
1713
1808
if(interface == NULL){
1714
1809
perror_plus("malloc");
1719
1814
free(direntries);
1720
1815
} else {
1721
1816
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1723
1818
exitcode = EXIT_FAILURE;
1724
1819
goto end;
1725
1820
}
1731
1826
srand((unsigned int) time(NULL));
1732
1827
mc.simple_poll = avahi_simple_poll_new();
1733
1828
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1735
1831
exitcode = EX_UNAVAILABLE;
1736
1832
goto end;
1737
1833
}
1803
1899
if(strcmp(interface, "none") != 0){
1804
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
1901
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1807
1903
exitcode = EX_UNAVAILABLE;
1808
1904
goto end;
1809
1905
}
1929
2025
#endif /* __linux__ */
1930
2026
/* Lower privileges */
1931
2027
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1944
2032
}
1945
2033
}
1946
2034
1950
2038
1951
2039
ret = init_gnutls_global(pubkey, seckey);
1952
2040
if(ret == -1){
1953
fprintf(stderr, "init_gnutls_global failed\n");
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1954
2042
exitcode = EX_UNAVAILABLE;
1955
2043
goto end;
1956
2044
} else {
1972
2060
}
1973
2061
1974
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1976
2064
exitcode = EX_UNAVAILABLE;
1977
2065
goto end;
1978
2066
} else {
1988
2076
/* (Mainly meant for debugging) */
1989
2077
char *address = strrchr(connect_to, ':');
1990
2078
if(address == NULL){
1991
fprintf(stderr, "No colon in address\n");
2079
fprintf_plus(stderr, "No colon in address\n");
1992
2080
exitcode = EX_USAGE;
1993
2081
goto end;
1994
2082
}
2002
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2003
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
2092
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2093
fprintf_plus(stderr, "Bad port number\n");
2006
2094
exitcode = EX_USAGE;
2007
2095
goto end;
2008
2096
}
2038
2126
break;
2039
2127
}
2040
2128
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2043
2131
}
2044
2132
sleep((int)retry_interval);
2045
2133
}
2075
2163
2076
2164
/* Check if creating the Avahi server object succeeded */
2077
2165
if(mc.server == NULL){
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2080
2168
exitcode = EX_UNAVAILABLE;
2081
2169
goto end;
2082
2170
}
2090
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2091
2179
NULL, 0, browse_callback, NULL);
2092
2180
if(sb == NULL){
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2095
2183
exitcode = EX_UNAVAILABLE;
2096
2184
goto end;
2097
2185
}
2103
2191
/* Run the main loop */
2104
2192
2105
2193
if(debug){
2106
fprintf(stderr, "Starting Avahi loop search\n");
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2107
2195
}
2108
2196
2109
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
2198
(int)(retry_interval * 1000));
2111
2199
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2114
2202
}
2115
2203
2116
2204
end:
2117
2205
2118
2206
if(debug){
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2120
2208
}
2121
2209
2122
2210
/* Cleanup things */
2138
2226
if(gpgme_initialized){
2139
2227
gpgme_release(mc.ctx);
2140
2228
}
2141
2229
2142
2230
/* Cleans up the circular linked list of Mandos servers the client
2143
2231
has seen */
2144
2232
if(mc.current_server != NULL){
2150
2238
}
2151
2239
}
2152
2240
2153
/* XXX run network hooks "stop" here */
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2154
2243
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2244
/* Re-raise priviliges */
2245
{
2158
2246
errno = 0;
2159
2247
ret = seteuid(0);
2160
2248
if(ret == -1){
2161
2249
perror_plus("seteuid");
2162
2250
}
2163
if(geteuid() == 0){
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2164
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
2255
if(ret == -1){
2166
2256
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2257
} else if(network.ifr_flags & IFF_UP){
2168
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
2260
if(ret == -1){
2175
2265
if(ret == -1){
2176
2266
perror_plus("close");
2177
2267
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
2184
2268
}
2185
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2186
2276
2187
2277
/* Removes the GPGME temp directory and all files inside */
2188
2278
if(tempdir_created){
2202
2292
}
2203
2293
ret = remove(fullname);
2204
2294
if(ret == -1){
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2207
2297
}
2208
2298
free(fullname);
2209
2299
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0