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- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- 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
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
173
188
/*
174
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
190
* bytes. "buffer_capacity" is how much is currently allocated,
176
191
* "buffer_length" is how much is already used.
177
192
*/
178
193
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
194
size_t buffer_capacity){
180
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
197
if(buffer == NULL){
188
203
}
189
204
190
205
/* 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){
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
194
208
int ret;
195
209
server *new_server = malloc(sizeof(server));
196
210
if(new_server == NULL){
197
211
perror_plus("malloc");
198
return -1;
212
return false;
199
213
}
200
214
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
215
.port = port,
216
.if_index = if_index,
217
.af = af };
204
218
if(new_server->ip == NULL){
205
219
perror_plus("strdup");
206
return -1;
220
return false;
207
221
}
208
222
/* Special case of first server */
209
223
if (mc.current_server == NULL){
220
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
235
if(ret == -1){
222
236
perror_plus("clock_gettime");
223
return -1;
237
return false;
224
238
}
225
return 0;
239
return true;
226
240
}
227
241
228
242
/*
229
243
* Initialize GPGME.
230
244
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
233
247
gpgme_error_t rc;
234
248
gpgme_engine_info_t engine_info;
235
249
250
264
251
265
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
266
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));
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
255
269
return false;
256
270
}
257
271
258
272
rc = gpgme_op_import(mc.ctx, pgp_data);
259
273
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
262
276
return false;
263
277
}
264
278
271
285
}
272
286
273
287
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
288
fprintf_plus(stderr, "Initializing GPGME\n");
275
289
}
276
290
277
291
/* Init GPGME */
278
292
gpgme_check_version(NULL);
279
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
294
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
283
297
return false;
284
298
}
285
299
286
300
/* Set GPGME home directory for the OpenPGP engine only */
287
301
rc = gpgme_get_engine_info(&engine_info);
288
302
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
291
305
return false;
292
306
}
293
307
while(engine_info != NULL){
299
313
engine_info = engine_info->next;
300
314
}
301
315
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
303
318
return false;
304
319
}
305
320
306
321
/* Create new GPGME "context" */
307
322
rc = gpgme_new(&(mc.ctx));
308
323
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
311
327
return false;
312
328
}
313
329
332
348
ssize_t plaintext_length = 0;
333
349
334
350
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
352
}
337
353
338
354
/* Create new GPGME data buffer from memory cryptotext */
339
355
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
356
0);
341
357
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));
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
344
360
return -1;
345
361
}
346
362
347
363
/* Create new empty GPGME data buffer for the plaintext */
348
364
rc = gpgme_data_new(&dh_plain);
349
365
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
352
369
gpgme_data_release(dh_crypto);
353
370
return -1;
354
371
}
357
374
data buffer */
358
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
376
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
362
379
plaintext_length = -1;
363
380
if(debug){
364
381
gpgme_decrypt_result_t result;
365
382
result = gpgme_op_decrypt_result(mc.ctx);
366
383
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
385
} 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);
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
373
390
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
392
}
376
393
gpgme_recipient_t recipient;
377
394
recipient = result->recipients;
378
395
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");
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
385
403
recipient = recipient->next;
386
404
}
387
405
}
390
408
}
391
409
392
410
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
412
}
395
413
396
414
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
421
*plaintext = NULL;
404
422
while(true){
405
423
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
424
(size_t)plaintext_length,
425
plaintext_capacity);
408
426
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
412
430
}
413
431
414
432
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
445
}
428
446
429
447
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
448
fprintf_plus(stderr, "Decrypted password is: ");
431
449
for(ssize_t i = 0; i < plaintext_length; i++){
432
450
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
451
}
455
473
/* GnuTLS log function callback */
456
474
static void debuggnutls(__attribute__((unused)) int level,
457
475
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
476
fprintf_plus(stderr, "GnuTLS: %s", string);
459
477
}
460
478
461
479
static int init_gnutls_global(const char *pubkeyfilename,
463
481
int ret;
464
482
465
483
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
485
}
468
486
469
487
ret = gnutls_global_init();
470
488
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
473
491
return -1;
474
492
}
475
493
484
502
/* OpenPGP credentials */
485
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
504
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
489
507
gnutls_global_deinit();
490
508
return -1;
491
509
}
492
510
493
511
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
497
516
}
498
517
499
518
ret = gnutls_certificate_set_openpgp_key_file
500
519
(mc.cred, pubkeyfilename, seckeyfilename,
501
520
GNUTLS_OPENPGP_FMT_BASE64);
502
521
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));
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
508
527
goto globalfail;
509
528
}
510
529
511
530
/* GnuTLS server initialization */
512
531
ret = gnutls_dh_params_init(&mc.dh_params);
513
532
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
516
536
goto globalfail;
517
537
}
518
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
539
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
522
542
goto globalfail;
523
543
}
524
544
544
564
}
545
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
566
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
549
570
}
550
571
551
572
{
558
579
}
559
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
581
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));
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
564
585
gnutls_deinit(*session);
565
586
return -1;
566
587
}
575
596
}
576
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
598
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
580
601
gnutls_deinit(*session);
581
602
return -1;
582
603
}
627
648
pf = PF_INET;
628
649
break;
629
650
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
652
errno = EINVAL;
632
653
return -1;
633
654
}
638
659
}
639
660
640
661
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
643
664
}
644
665
645
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
692
}
672
693
if(ret == 0){
673
694
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
696
errno = e;
676
697
goto mandos_end;
677
698
}
682
703
683
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
706
-Wunreachable-code*/
686
707
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
689
710
errno = EINVAL;
690
711
goto mandos_end;
691
712
}
709
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
731
perror_plus("if_indextoname");
711
732
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
714
735
}
715
736
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
718
739
}
719
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
751
perror_plus("inet_ntop");
731
752
} else {
732
753
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
755
}
735
756
}
736
757
}
764
785
while(true){
765
786
size_t out_size = strlen(out);
766
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
788
out_size - written));
768
789
if(ret == -1){
769
790
int e = errno;
770
791
perror_plus("write");
790
811
}
791
812
792
813
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
815
}
795
816
796
817
if(quit_now){
816
837
817
838
if(ret != GNUTLS_E_SUCCESS){
818
839
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
841
gnutls_perror(ret);
821
842
}
822
843
errno = EPROTO;
826
847
/* Read OpenPGP packet that contains the wanted password */
827
848
828
849
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
831
852
}
832
853
833
854
while(true){
838
859
}
839
860
840
861
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
862
buffer_capacity);
842
863
if(buffer_capacity == 0){
843
864
int e = errno;
844
865
perror_plus("incbuffer");
871
892
}
872
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
894
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
875
897
gnutls_perror(ret);
876
898
errno = EPROTO;
877
899
goto mandos_end;
878
900
}
879
901
break;
880
902
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
883
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
906
errno = EIO;
885
907
goto mandos_end;
890
912
}
891
913
892
914
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
915
fprintf_plus(stderr, "Closing TLS session\n");
894
916
}
895
917
896
918
if(quit_now){
908
930
909
931
if(buffer_length > 0){
910
932
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
913
934
&decrypted_buffer);
914
935
if(decrypted_buffer_size >= 0){
915
936
926
947
if(ret == 0 and ferror(stdout)){
927
948
int e = errno;
928
949
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
931
952
}
932
953
errno = e;
933
954
goto mandos_end;
990
1011
switch(event){
991
1012
default:
992
1013
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)));
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
996
1018
break;
997
1019
998
1020
case AVAHI_RESOLVER_FOUND:
1000
1022
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1023
avahi_address_snprint(ip, sizeof(ip), address);
1002
1024
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);
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
1006
1028
}
1007
1029
int ret = start_mandos_communication(ip, port, interface,
1008
1030
avahi_proto_to_af(proto));
1009
1031
if(ret == 0){
1010
1032
avahi_simple_poll_quit(mc.simple_poll);
1011
1033
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
1014
1039
}
1015
1040
}
1016
1041
}
1040
1065
default:
1041
1066
case AVAHI_BROWSER_FAILURE:
1042
1067
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1045
1070
avahi_simple_poll_quit(mc.simple_poll);
1046
1071
return;
1047
1072
1054
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
1080
name, type, domain, protocol, 0,
1056
1081
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1059
1085
break;
1060
1086
1061
1087
case AVAHI_BROWSER_REMOVE:
1064
1090
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1091
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1092
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
1068
1095
}
1069
1096
break;
1070
1097
}
1085
1112
errno = old_errno;
1086
1113
}
1087
1114
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){
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1144
1126
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1127
perror_plus("ioctl SIOCGIFFLAGS");
1147
1128
}
1148
free(flagstring);
1149
return 0;
1129
return false;
1150
1130
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1153
1136
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1155
1138
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1158
1141
}
1159
return 0;
1142
return false;
1160
1143
}
1161
1144
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1163
1146
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1166
1149
}
1167
return 1;
1150
return true;
1168
1151
}
1169
1152
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1171
1154
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1174
1157
}
1175
return 0;
1158
return false;
1176
1159
}
1177
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1161
if(ifr->ifr_flags & IFF_NOARP){
1179
1162
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1182
1165
}
1183
return 0;
1166
return false;
1184
1167
}
1168
1185
1169
/* Accept this device */
1186
1170
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1189
1240
}
1190
1241
return 1;
1191
1242
}
1201
1252
return 1;
1202
1253
}
1203
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1204
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
1317
int ret;
1206
1318
struct timespec now;
1210
1322
while(true){
1211
1323
if(mc.current_server == NULL){
1212
1324
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1215
1327
}
1216
1328
ret = avahi_simple_poll_iterate(s, -1);
1217
1329
} else {
1218
1330
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1221
1333
}
1222
1334
/* the current time */
1223
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1239
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1352
1241
1353
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1243
1356
}
1244
1357
1245
1358
if(block_time <= 0){
1265
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1379
}
1267
1380
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1381
if (ret > 0 or errno != EINTR){
1269
1382
return (ret != 1) ? ret : 0;
1270
1383
}
1271
1384
}
1272
1385
}
1273
1386
}
1274
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1515
}
1516
1275
1517
int main(int argc, char *argv[]){
1276
1518
AvahiSServiceBrowser *sb = NULL;
1277
1519
int error;
1359
1601
.arg = "SECONDS",
1360
1602
.doc = "Retry interval used when denied by the mandos server",
1361
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1362
1608
/*
1363
1609
* These reproduce what we would get without ARGP_NO_HELP
1364
1610
*/
1417
1663
argp_error(state, "Bad retry interval");
1418
1664
}
1419
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1668
break;
1420
1669
/*
1421
1670
* These reproduce what we would get without ARGP_NO_HELP
1422
1671
*/
1428
1677
argp_state_help(state, state->out_stream,
1429
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1679
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1681
exit(argp_err_exit_status);
1433
1682
break;
1434
1683
default:
1461
1710
{
1462
1711
/* Work around Debian bug #633582:
1463
1712
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1713
1466
1714
/* Re-raise priviliges */
1467
1715
errno = 0;
1468
1716
ret = seteuid(0);
1469
1717
if(ret == -1){
1470
1718
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
}
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1519
1776
}
1520
1777
1521
1778
if(not debug){
1522
1779
avahi_set_log_function(empty_log);
1523
1780
}
1524
1781
1525
1782
if(interface[0] == '\0'){
1526
1783
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1528
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1529
1793
if(ret >= 1){
1530
/* Pick the first good interface */
1794
/* Pick the first interface returned */
1531
1795
interface = strdup(direntries[0]->d_name);
1532
1796
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1534
1798
}
1535
1799
if(interface == NULL){
1536
1800
perror_plus("malloc");
1541
1805
free(direntries);
1542
1806
} else {
1543
1807
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1545
1809
exitcode = EXIT_FAILURE;
1546
1810
goto end;
1547
1811
}
1553
1817
srand((unsigned int) time(NULL));
1554
1818
mc.simple_poll = avahi_simple_poll_new();
1555
1819
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1557
1822
exitcode = EX_UNAVAILABLE;
1558
1823
goto end;
1559
1824
}
1625
1890
if(strcmp(interface, "none") != 0){
1626
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1892
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1629
1894
exitcode = EX_UNAVAILABLE;
1630
1895
goto end;
1631
1896
}
1751
2016
#endif /* __linux__ */
1752
2017
/* Lower privileges */
1753
2018
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
}
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
1766
2023
}
1767
2024
}
1768
2025
1772
2029
1773
2030
ret = init_gnutls_global(pubkey, seckey);
1774
2031
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2033
exitcode = EX_UNAVAILABLE;
1777
2034
goto end;
1778
2035
} else {
1794
2051
}
1795
2052
1796
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2054
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2055
exitcode = EX_UNAVAILABLE;
1799
2056
goto end;
1800
2057
} else {
1810
2067
/* (Mainly meant for debugging) */
1811
2068
char *address = strrchr(connect_to, ':');
1812
2069
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2070
fprintf_plus(stderr, "No colon in address\n");
1814
2071
exitcode = EX_USAGE;
1815
2072
goto end;
1816
2073
}
1824
2081
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
2083
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2084
fprintf_plus(stderr, "Bad port number\n");
1828
2085
exitcode = EX_USAGE;
1829
2086
goto end;
1830
2087
}
1860
2117
break;
1861
2118
}
1862
2119
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
1865
2122
}
1866
2123
sleep((int)retry_interval);
1867
2124
}
1869
2126
if (not quit_now){
1870
2127
exitcode = EXIT_SUCCESS;
1871
2128
}
1872
2129
1873
2130
goto end;
1874
2131
}
1875
2132
1897
2154
1898
2155
/* Check if creating the Avahi server object succeeded */
1899
2156
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
1902
2159
exitcode = EX_UNAVAILABLE;
1903
2160
goto end;
1904
2161
}
1912
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
2170
NULL, 0, browse_callback, NULL);
1914
2171
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
1917
2174
exitcode = EX_UNAVAILABLE;
1918
2175
goto end;
1919
2176
}
1925
2182
/* Run the main loop */
1926
2183
1927
2184
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2186
}
1930
2187
1931
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
2189
(int)(retry_interval * 1000));
1933
2190
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
1936
2193
}
1937
2194
1938
2195
end:
1939
2196
1940
2197
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2199
}
1943
2200
1944
2201
/* Cleanup things */
1960
2217
if(gpgme_initialized){
1961
2218
gpgme_release(mc.ctx);
1962
2219
}
1963
2220
1964
2221
/* Cleans up the circular linked list of Mandos servers the client
1965
2222
has seen */
1966
2223
if(mc.current_server != NULL){
1972
2229
}
1973
2230
}
1974
2231
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
1978
2237
errno = 0;
1979
2238
ret = seteuid(0);
1980
2239
if(ret == -1){
1981
2240
perror_plus("seteuid");
1982
2241
}
1983
if(geteuid() == 0){
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
1984
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
2246
if(ret == -1){
1986
2247
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
2248
} else if(network.ifr_flags & IFF_UP){
1988
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
2251
if(ret == -1){
1995
2256
if(ret == -1){
1996
2257
perror_plus("close");
1997
2258
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
2259
}
2005
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2006
2267
2007
2268
/* Removes the GPGME temp directory and all files inside */
2008
2269
if(tempdir_created){
2022
2283
}
2023
2284
ret = remove(fullname);
2024
2285
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2027
2288
}
2028
2289
free(fullname);
2029
2290
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0