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- Committer: teddy at bsnet
- Date: 2011-11-12 18:15:29 UTC
- mfrom: (521.1.1 doc-filename-class)
- Revision ID: teddy@fukt.bsnet.se-20111112181529-v4emlw0v5fugv2tk
Merge doc markup fixes.
- files removed:
- 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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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(), _exit() */
76
setgid(), pause() */
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() */
91
88
92
89
#ifdef __linux__
93
90
#include <sys/klog.h> /* klogctl() */
111
108
init_gnutls_session(),
112
109
GNUTLS_* */
113
110
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
116
113
117
114
/* GPGME */
118
115
#include <gpgme.h> /* All GPGME types, constants and
126
123
#define PATHDIR "/conf/conf.d/mandos"
127
124
#define SECKEY "seckey.txt"
128
125
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
126
131
127
bool debug = false;
132
128
static const char mandos_protocol_version[] = "1";
134
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
131
static const char sys_class_net[] = "/sys/class/net";
136
132
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
133
139
134
/* Doubly linked list that need to be circularly linked when used */
140
135
typedef struct server{
175
170
perror(print_text);
176
171
}
177
172
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
188
173
/*
189
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
190
175
* bytes. "buffer_capacity" is how much is currently allocated,
191
176
* "buffer_length" is how much is already used.
192
177
*/
193
178
size_t incbuffer(char **buffer, size_t buffer_length,
194
size_t buffer_capacity){
179
size_t buffer_capacity){
195
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
196
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
182
if(buffer == NULL){
203
188
}
204
189
205
190
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
208
194
int ret;
209
195
server *new_server = malloc(sizeof(server));
210
196
if(new_server == NULL){
211
197
perror_plus("malloc");
212
return false;
198
return -1;
213
199
}
214
200
*new_server = (server){ .ip = strdup(ip),
215
.port = port,
216
.if_index = if_index,
217
.af = af };
201
.port = port,
202
.if_index = if_index,
203
.af = af };
218
204
if(new_server->ip == NULL){
219
205
perror_plus("strdup");
220
return false;
206
return -1;
221
207
}
222
208
/* Special case of first server */
223
209
if (mc.current_server == NULL){
234
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
221
if(ret == -1){
236
222
perror_plus("clock_gettime");
237
return false;
223
return -1;
238
224
}
239
return true;
225
return 0;
240
226
}
241
227
242
228
/*
243
229
* Initialize GPGME.
244
230
*/
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
247
233
gpgme_error_t rc;
248
234
gpgme_engine_info_t engine_info;
249
235
264
250
265
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
266
252
if(rc != GPG_ERR_NO_ERROR){
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
269
255
return false;
270
256
}
271
257
272
258
rc = gpgme_op_import(mc.ctx, pgp_data);
273
259
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
276
262
return false;
277
263
}
278
264
285
271
}
286
272
287
273
if(debug){
288
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
289
275
}
290
276
291
277
/* Init GPGME */
292
278
gpgme_check_version(NULL);
293
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
280
if(rc != GPG_ERR_NO_ERROR){
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
297
283
return false;
298
284
}
299
285
300
286
/* Set GPGME home directory for the OpenPGP engine only */
301
287
rc = gpgme_get_engine_info(&engine_info);
302
288
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
305
291
return false;
306
292
}
307
293
while(engine_info != NULL){
313
299
engine_info = engine_info->next;
314
300
}
315
301
if(engine_info == NULL){
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
303
return false;
319
304
}
320
305
321
306
/* Create new GPGME "context" */
322
307
rc = gpgme_new(&(mc.ctx));
323
308
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
327
311
return false;
328
312
}
329
313
348
332
ssize_t plaintext_length = 0;
349
333
350
334
if(debug){
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
352
336
}
353
337
354
338
/* Create new GPGME data buffer from memory cryptotext */
355
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
356
340
0);
357
341
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
360
344
return -1;
361
345
}
362
346
363
347
/* Create new empty GPGME data buffer for the plaintext */
364
348
rc = gpgme_data_new(&dh_plain);
365
349
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
369
352
gpgme_data_release(dh_crypto);
370
353
return -1;
371
354
}
374
357
data buffer */
375
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
376
359
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
379
362
plaintext_length = -1;
380
363
if(debug){
381
364
gpgme_decrypt_result_t result;
382
365
result = gpgme_op_decrypt_result(mc.ctx);
383
366
if(result == NULL){
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
385
368
} else {
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);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
390
373
if(result->file_name != NULL){
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
392
375
}
393
376
gpgme_recipient_t recipient;
394
377
recipient = result->recipients;
395
378
while(recipient != NULL){
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");
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");
403
385
recipient = recipient->next;
404
386
}
405
387
}
408
390
}
409
391
410
392
if(debug){
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
412
394
}
413
395
414
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
421
403
*plaintext = NULL;
422
404
while(true){
423
405
plaintext_capacity = incbuffer(plaintext,
424
(size_t)plaintext_length,
425
plaintext_capacity);
406
(size_t)plaintext_length,
407
plaintext_capacity);
426
408
if(plaintext_capacity == 0){
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
430
412
}
431
413
432
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
445
427
}
446
428
447
429
if(debug){
448
fprintf_plus(stderr, "Decrypted password is: ");
430
fprintf(stderr, "Decrypted password is: ");
449
431
for(ssize_t i = 0; i < plaintext_length; i++){
450
432
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
451
433
}
473
455
/* GnuTLS log function callback */
474
456
static void debuggnutls(__attribute__((unused)) int level,
475
457
const char* string){
476
fprintf_plus(stderr, "GnuTLS: %s", string);
458
fprintf(stderr, "GnuTLS: %s", string);
477
459
}
478
460
479
461
static int init_gnutls_global(const char *pubkeyfilename,
481
463
int ret;
482
464
483
465
if(debug){
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
fprintf(stderr, "Initializing GnuTLS\n");
485
467
}
486
468
487
469
ret = gnutls_global_init();
488
470
if(ret != GNUTLS_E_SUCCESS){
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
491
473
return -1;
492
474
}
493
475
502
484
/* OpenPGP credentials */
503
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
504
486
if(ret != GNUTLS_E_SUCCESS){
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
507
489
gnutls_global_deinit();
508
490
return -1;
509
491
}
510
492
511
493
if(debug){
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
516
497
}
517
498
518
499
ret = gnutls_certificate_set_openpgp_key_file
519
500
(mc.cred, pubkeyfilename, seckeyfilename,
520
501
GNUTLS_OPENPGP_FMT_BASE64);
521
502
if(ret != GNUTLS_E_SUCCESS){
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));
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));
527
508
goto globalfail;
528
509
}
529
510
530
511
/* GnuTLS server initialization */
531
512
ret = gnutls_dh_params_init(&mc.dh_params);
532
513
if(ret != GNUTLS_E_SUCCESS){
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
536
516
goto globalfail;
537
517
}
538
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
519
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
542
522
goto globalfail;
543
523
}
544
524
564
544
}
565
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
566
546
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
570
549
}
571
550
572
551
{
579
558
}
580
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
581
560
if(ret != GNUTLS_E_SUCCESS){
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
585
564
gnutls_deinit(*session);
586
565
return -1;
587
566
}
596
575
}
597
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
598
577
if(ret != GNUTLS_E_SUCCESS){
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
601
580
gnutls_deinit(*session);
602
581
return -1;
603
582
}
648
627
pf = PF_INET;
649
628
break;
650
629
default:
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
652
631
errno = EINVAL;
653
632
return -1;
654
633
}
659
638
}
660
639
661
640
if(debug){
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
664
643
}
665
644
666
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
692
671
}
693
672
if(ret == 0){
694
673
int e = errno;
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
fprintf(stderr, "Bad address: %s\n", ip);
696
675
errno = e;
697
676
goto mandos_end;
698
677
}
703
682
704
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
685
-Wunreachable-code*/
707
686
if(if_index == AVAHI_IF_UNSPEC){
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
710
689
errno = EINVAL;
711
690
goto mandos_end;
712
691
}
730
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
731
710
perror_plus("if_indextoname");
732
711
} else {
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
735
714
}
736
715
} else {
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
739
718
}
740
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
741
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
751
730
perror_plus("inet_ntop");
752
731
} else {
753
732
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
734
}
756
735
}
757
736
}
785
764
while(true){
786
765
size_t out_size = strlen(out);
787
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
788
out_size - written));
767
out_size - written));
789
768
if(ret == -1){
790
769
int e = errno;
791
770
perror_plus("write");
811
790
}
812
791
813
792
if(debug){
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
815
794
}
816
795
817
796
if(quit_now){
837
816
838
817
if(ret != GNUTLS_E_SUCCESS){
839
818
if(debug){
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
841
820
gnutls_perror(ret);
842
821
}
843
822
errno = EPROTO;
847
826
/* Read OpenPGP packet that contains the wanted password */
848
827
849
828
if(debug){
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
852
831
}
853
832
854
833
while(true){
859
838
}
860
839
861
840
buffer_capacity = incbuffer(&buffer, buffer_length,
862
buffer_capacity);
841
buffer_capacity);
863
842
if(buffer_capacity == 0){
864
843
int e = errno;
865
844
perror_plus("incbuffer");
892
871
}
893
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
873
if(ret < 0){
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
875
gnutls_perror(ret);
898
876
errno = EPROTO;
899
877
goto mandos_end;
900
878
}
901
879
break;
902
880
default:
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
905
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
906
884
errno = EIO;
907
885
goto mandos_end;
912
890
}
913
891
914
892
if(debug){
915
fprintf_plus(stderr, "Closing TLS session\n");
893
fprintf(stderr, "Closing TLS session\n");
916
894
}
917
895
918
896
if(quit_now){
930
908
931
909
if(buffer_length > 0){
932
910
ssize_t decrypted_buffer_size;
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
934
913
&decrypted_buffer);
935
914
if(decrypted_buffer_size >= 0){
936
915
947
926
if(ret == 0 and ferror(stdout)){
948
927
int e = errno;
949
928
if(debug){
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
952
931
}
953
932
errno = e;
954
933
goto mandos_end;
1011
990
switch(event){
1012
991
default:
1013
992
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
1018
996
break;
1019
997
1020
998
case AVAHI_RESOLVER_FOUND:
1022
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1023
1001
avahi_address_snprint(ip, sizeof(ip), address);
1024
1002
if(debug){
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);
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);
1028
1006
}
1029
1007
int ret = start_mandos_communication(ip, port, interface,
1030
1008
avahi_proto_to_af(proto));
1031
1009
if(ret == 0){
1032
1010
avahi_simple_poll_quit(mc.simple_poll);
1033
1011
} else {
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
}
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1039
1014
}
1040
1015
}
1041
1016
}
1065
1040
default:
1066
1041
case AVAHI_BROWSER_FAILURE:
1067
1042
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1070
1045
avahi_simple_poll_quit(mc.simple_poll);
1071
1046
return;
1072
1047
1079
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
1055
name, type, domain, protocol, 0,
1081
1056
resolve_callback, NULL) == NULL)
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1085
1059
break;
1086
1060
1087
1061
case AVAHI_BROWSER_REMOVE:
1090
1064
case AVAHI_BROWSER_ALL_FOR_NOW:
1091
1065
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1092
1066
if(debug){
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
1068
}
1096
1069
break;
1097
1070
}
1112
1085
errno = old_errno;
1113
1086
}
1114
1087
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){
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){
1126
1144
if(debug){
1127
perror_plus("ioctl SIOCGIFFLAGS");
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1128
1147
}
1129
return false;
1148
free(flagstring);
1149
return 0;
1130
1150
}
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1136
1153
/* Reject the loopback device */
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1138
1155
if(debug){
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1141
1158
}
1142
return false;
1159
return 0;
1143
1160
}
1144
1161
/* Accept point-to-point devices only if connect_to is specified */
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1146
1163
if(debug){
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1149
1166
}
1150
return true;
1167
return 1;
1151
1168
}
1152
1169
/* Otherwise, reject non-broadcast-capable devices */
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1154
1171
if(debug){
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1157
1174
}
1158
return false;
1175
return 0;
1159
1176
}
1160
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1161
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1162
1179
if(debug){
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1165
1182
}
1166
return false;
1183
return 0;
1167
1184
}
1168
1169
1185
/* Accept this device */
1170
1186
if(debug){
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;
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1240
1189
}
1241
1190
return 1;
1242
1191
}
1252
1201
return 1;
1253
1202
}
1254
1203
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
1316
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1317
1205
int ret;
1318
1206
struct timespec now;
1322
1210
while(true){
1323
1211
if(mc.current_server == NULL){
1324
1212
if (debug){
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1327
1215
}
1328
1216
ret = avahi_simple_poll_iterate(s, -1);
1329
1217
} else {
1330
1218
if (debug){
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1333
1221
}
1334
1222
/* the current time */
1335
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1351
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1352
1240
1353
1241
if (debug){
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1356
1243
}
1357
1244
1358
1245
if(block_time <= 0){
1378
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1379
1266
}
1380
1267
if(ret != 0){
1381
if (ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1382
1269
return (ret != 1) ? ret : 0;
1383
1270
}
1384
1271
}
1385
1272
}
1386
1273
}
1387
1274
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
1517
1275
int main(int argc, char *argv[]){
1518
1276
AvahiSServiceBrowser *sb = NULL;
1519
1277
int error;
1601
1359
.arg = "SECONDS",
1602
1360
.doc = "Retry interval used when denied by the mandos server",
1603
1361
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1608
1362
/*
1609
1363
* These reproduce what we would get without ARGP_NO_HELP
1610
1364
*/
1663
1417
argp_error(state, "Bad retry interval");
1664
1418
}
1665
1419
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1668
break;
1669
1420
/*
1670
1421
* These reproduce what we would get without ARGP_NO_HELP
1671
1422
*/
1677
1428
argp_state_help(state, state->out_stream,
1678
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1679
1430
case 'V': /* --version */
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1681
1432
exit(argp_err_exit_status);
1682
1433
break;
1683
1434
default:
1710
1461
{
1711
1462
/* Work around Debian bug #633582:
1712
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1713
1465
1714
1466
/* Re-raise priviliges */
1715
1467
errno = 0;
1716
1468
ret = seteuid(0);
1717
1469
if(ret == -1){
1718
1470
perror_plus("seteuid");
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;
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
}
1776
1519
}
1777
1520
1778
1521
if(not debug){
1779
1522
avahi_set_log_function(empty_log);
1780
1523
}
1781
1524
1782
1525
if(interface[0] == '\0'){
1783
1526
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1786
1528
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
}
1793
1529
if(ret >= 1){
1794
/* Pick the first interface returned */
1530
/* Pick the first good interface */
1795
1531
interface = strdup(direntries[0]->d_name);
1796
1532
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1798
1534
}
1799
1535
if(interface == NULL){
1800
1536
perror_plus("malloc");
1805
1541
free(direntries);
1806
1542
} else {
1807
1543
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1544
fprintf(stderr, "Could not find a network interface\n");
1809
1545
exitcode = EXIT_FAILURE;
1810
1546
goto end;
1811
1547
}
1817
1553
srand((unsigned int) time(NULL));
1818
1554
mc.simple_poll = avahi_simple_poll_new();
1819
1555
if(mc.simple_poll == NULL){
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1822
1557
exitcode = EX_UNAVAILABLE;
1823
1558
goto end;
1824
1559
}
1890
1625
if(strcmp(interface, "none") != 0){
1891
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
1627
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1894
1629
exitcode = EX_UNAVAILABLE;
1895
1630
goto end;
1896
1631
}
2016
1751
#endif /* __linux__ */
2017
1752
/* Lower privileges */
2018
1753
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
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
}
2023
1766
}
2024
1767
}
2025
1768
2029
1772
2030
1773
ret = init_gnutls_global(pubkey, seckey);
2031
1774
if(ret == -1){
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2033
1776
exitcode = EX_UNAVAILABLE;
2034
1777
goto end;
2035
1778
} else {
2051
1794
}
2052
1795
2053
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf_plus(stderr, "init_gpgme failed\n");
1797
fprintf(stderr, "init_gpgme failed\n");
2055
1798
exitcode = EX_UNAVAILABLE;
2056
1799
goto end;
2057
1800
} else {
2067
1810
/* (Mainly meant for debugging) */
2068
1811
char *address = strrchr(connect_to, ':');
2069
1812
if(address == NULL){
2070
fprintf_plus(stderr, "No colon in address\n");
1813
fprintf(stderr, "No colon in address\n");
2071
1814
exitcode = EX_USAGE;
2072
1815
goto end;
2073
1816
}
2081
1824
tmpmax = strtoimax(address+1, &tmp, 10);
2082
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2083
1826
or tmpmax != (uint16_t)tmpmax){
2084
fprintf_plus(stderr, "Bad port number\n");
1827
fprintf(stderr, "Bad port number\n");
2085
1828
exitcode = EX_USAGE;
2086
1829
goto end;
2087
1830
}
2117
1860
break;
2118
1861
}
2119
1862
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2122
1865
}
2123
1866
sleep((int)retry_interval);
2124
1867
}
2126
1869
if (not quit_now){
2127
1870
exitcode = EXIT_SUCCESS;
2128
1871
}
2129
1872
2130
1873
goto end;
2131
1874
}
2132
1875
2154
1897
2155
1898
/* Check if creating the Avahi server object succeeded */
2156
1899
if(mc.server == NULL){
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2159
1902
exitcode = EX_UNAVAILABLE;
2160
1903
goto end;
2161
1904
}
2169
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2170
1913
NULL, 0, browse_callback, NULL);
2171
1914
if(sb == NULL){
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2174
1917
exitcode = EX_UNAVAILABLE;
2175
1918
goto end;
2176
1919
}
2182
1925
/* Run the main loop */
2183
1926
2184
1927
if(debug){
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
1928
fprintf(stderr, "Starting Avahi loop search\n");
2186
1929
}
2187
1930
2188
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
1932
(int)(retry_interval * 1000));
2190
1933
if(debug){
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2193
1936
}
2194
1937
2195
1938
end:
2196
1939
2197
1940
if(debug){
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2199
1942
}
2200
1943
2201
1944
/* Cleanup things */
2217
1960
if(gpgme_initialized){
2218
1961
gpgme_release(mc.ctx);
2219
1962
}
2220
1963
2221
1964
/* Cleans up the circular linked list of Mandos servers the client
2222
1965
has seen */
2223
1966
if(mc.current_server != NULL){
2229
1972
}
2230
1973
}
2231
1974
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
2237
1978
errno = 0;
2238
1979
ret = seteuid(0);
2239
1980
if(ret == -1){
2240
1981
perror_plus("seteuid");
2241
1982
}
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
1983
if(geteuid() == 0){
2245
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
1985
if(ret == -1){
2247
1986
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
1987
} else if(network.ifr_flags & IFF_UP) {
2249
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
1990
if(ret == -1){
2256
1995
if(ret == -1){
2257
1996
perror_plus("close");
2258
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2259
2004
}
2260
2005
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
2267
2006
2268
2007
/* Removes the GPGME temp directory and all files inside */
2269
2008
if(tempdir_created){
2283
2022
}
2284
2023
ret = remove(fullname);
2285
2024
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2288
2027
}
2289
2028
free(fullname);
2290
2029
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0