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- Committer: Teddy Hogeborn
- Date: 2011-11-11 09:10:58 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111111091058-60y74fpjy2ce1c17
Intermediate commit - this does *not* work yet.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
- files removed:
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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
134
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
132
static const char sys_class_net[] = "/sys/class/net";
136
133
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
134
139
135
/* Doubly linked list that need to be circularly linked when used */
140
136
typedef struct server{
170
166
171
167
/* Function to use when printing errors */
172
168
void perror_plus(const char *print_text){
173
int e = errno;
174
169
fprintf(stderr, "Mandos plugin %s: ",
175
170
program_invocation_short_name);
176
errno = e;
177
171
perror(print_text);
178
172
}
179
173
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
174
/*
191
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
176
* bytes. "buffer_capacity" is how much is currently allocated,
193
177
* "buffer_length" is how much is already used.
194
178
*/
195
179
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
180
size_t buffer_capacity){
197
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
183
if(buffer == NULL){
205
189
}
206
190
207
191
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
210
195
int ret;
211
196
server *new_server = malloc(sizeof(server));
212
197
if(new_server == NULL){
213
198
perror_plus("malloc");
214
return false;
199
return -1;
215
200
}
216
201
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
220
205
if(new_server->ip == NULL){
221
206
perror_plus("strdup");
222
return false;
207
return -1;
223
208
}
224
209
/* Special case of first server */
225
210
if (mc.current_server == NULL){
236
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
222
if(ret == -1){
238
223
perror_plus("clock_gettime");
239
return false;
224
return -1;
240
225
}
241
return true;
226
return 0;
242
227
}
243
228
244
229
/*
245
230
* Initialize GPGME.
246
231
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
249
234
gpgme_error_t rc;
250
235
gpgme_engine_info_t engine_info;
251
236
266
251
267
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
253
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
271
256
return false;
272
257
}
273
258
274
259
rc = gpgme_op_import(mc.ctx, pgp_data);
275
260
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
278
263
return false;
279
264
}
280
265
287
272
}
288
273
289
274
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
291
276
}
292
277
293
278
/* Init GPGME */
294
279
gpgme_check_version(NULL);
295
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
281
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
299
284
return false;
300
285
}
301
286
302
287
/* Set GPGME home directory for the OpenPGP engine only */
303
288
rc = gpgme_get_engine_info(&engine_info);
304
289
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
307
292
return false;
308
293
}
309
294
while(engine_info != NULL){
315
300
engine_info = engine_info->next;
316
301
}
317
302
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
304
return false;
321
305
}
322
306
323
307
/* Create new GPGME "context" */
324
308
rc = gpgme_new(&(mc.ctx));
325
309
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
329
312
return false;
330
313
}
331
314
350
333
ssize_t plaintext_length = 0;
351
334
352
335
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
337
}
355
338
356
339
/* Create new GPGME data buffer from memory cryptotext */
357
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
341
0);
359
342
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
362
345
return -1;
363
346
}
364
347
365
348
/* Create new empty GPGME data buffer for the plaintext */
366
349
rc = gpgme_data_new(&dh_plain);
367
350
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
371
353
gpgme_data_release(dh_crypto);
372
354
return -1;
373
355
}
376
358
data buffer */
377
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
360
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
381
363
plaintext_length = -1;
382
364
if(debug){
383
365
gpgme_decrypt_result_t result;
384
366
result = gpgme_op_decrypt_result(mc.ctx);
385
367
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
369
} else {
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);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
392
374
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
394
376
}
395
377
gpgme_recipient_t recipient;
396
378
recipient = result->recipients;
397
379
while(recipient != NULL){
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");
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
405
386
recipient = recipient->next;
406
387
}
407
388
}
410
391
}
411
392
412
393
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
395
}
415
396
416
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
423
404
*plaintext = NULL;
424
405
while(true){
425
406
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
428
409
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
432
413
}
433
414
434
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
447
428
}
448
429
449
430
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
451
432
for(ssize_t i = 0; i < plaintext_length; i++){
452
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
434
}
475
456
/* GnuTLS log function callback */
476
457
static void debuggnutls(__attribute__((unused)) int level,
477
458
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
479
460
}
480
461
481
462
static int init_gnutls_global(const char *pubkeyfilename,
483
464
int ret;
484
465
485
466
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
487
468
}
488
469
489
470
ret = gnutls_global_init();
490
471
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
493
474
return -1;
494
475
}
495
476
504
485
/* OpenPGP credentials */
505
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
487
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
509
490
gnutls_global_deinit();
510
491
return -1;
511
492
}
512
493
513
494
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
518
498
}
519
499
520
500
ret = gnutls_certificate_set_openpgp_key_file
521
501
(mc.cred, pubkeyfilename, seckeyfilename,
522
502
GNUTLS_OPENPGP_FMT_BASE64);
523
503
if(ret != GNUTLS_E_SUCCESS){
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));
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
529
509
goto globalfail;
530
510
}
531
511
532
512
/* GnuTLS server initialization */
533
513
ret = gnutls_dh_params_init(&mc.dh_params);
534
514
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
538
517
goto globalfail;
539
518
}
540
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
520
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
544
523
goto globalfail;
545
524
}
546
525
566
545
}
567
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
547
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
572
550
}
573
551
574
552
{
581
559
}
582
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
561
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
587
565
gnutls_deinit(*session);
588
566
return -1;
589
567
}
598
576
}
599
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
578
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
603
581
gnutls_deinit(*session);
604
582
return -1;
605
583
}
650
628
pf = PF_INET;
651
629
break;
652
630
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
654
632
errno = EINVAL;
655
633
return -1;
656
634
}
661
639
}
662
640
663
641
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
666
644
}
667
645
668
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
694
672
}
695
673
if(ret == 0){
696
674
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
698
676
errno = e;
699
677
goto mandos_end;
700
678
}
705
683
706
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
686
-Wunreachable-code*/
709
687
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
712
690
errno = EINVAL;
713
691
goto mandos_end;
714
692
}
732
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
711
perror_plus("if_indextoname");
734
712
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
737
715
}
738
716
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
741
719
}
742
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
753
731
perror_plus("inet_ntop");
754
732
} else {
755
733
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
735
}
758
736
}
759
737
}
787
765
while(true){
788
766
size_t out_size = strlen(out);
789
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
768
out_size - written));
791
769
if(ret == -1){
792
770
int e = errno;
793
771
perror_plus("write");
813
791
}
814
792
815
793
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
795
}
818
796
819
797
if(quit_now){
839
817
840
818
if(ret != GNUTLS_E_SUCCESS){
841
819
if(debug){
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
843
821
gnutls_perror(ret);
844
822
}
845
823
errno = EPROTO;
849
827
/* Read OpenPGP packet that contains the wanted password */
850
828
851
829
if(debug){
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
854
832
}
855
833
856
834
while(true){
861
839
}
862
840
863
841
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
842
buffer_capacity);
865
843
if(buffer_capacity == 0){
866
844
int e = errno;
867
845
perror_plus("incbuffer");
894
872
}
895
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
874
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
876
gnutls_perror(ret);
900
877
errno = EPROTO;
901
878
goto mandos_end;
902
879
}
903
880
break;
904
881
default:
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
907
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
885
errno = EIO;
909
886
goto mandos_end;
914
891
}
915
892
916
893
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
918
895
}
919
896
920
897
if(quit_now){
932
909
933
910
if(buffer_length > 0){
934
911
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
936
914
&decrypted_buffer);
937
915
if(decrypted_buffer_size >= 0){
938
916
949
927
if(ret == 0 and ferror(stdout)){
950
928
int e = errno;
951
929
if(debug){
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
954
932
}
955
933
errno = e;
956
934
goto mandos_end;
1013
991
switch(event){
1014
992
default:
1015
993
case AVAHI_RESOLVER_FAILURE:
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)));
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1020
997
break;
1021
998
1022
999
case AVAHI_RESOLVER_FOUND:
1024
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1025
1002
avahi_address_snprint(ip, sizeof(ip), address);
1026
1003
if(debug){
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);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1030
1007
}
1031
1008
int ret = start_mandos_communication(ip, port, interface,
1032
1009
avahi_proto_to_af(proto));
1033
1010
if(ret == 0){
1034
1011
avahi_simple_poll_quit(mc.simple_poll);
1035
1012
} else {
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
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1041
1015
}
1042
1016
}
1043
1017
}
1067
1041
default:
1068
1042
case AVAHI_BROWSER_FAILURE:
1069
1043
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1072
1046
avahi_simple_poll_quit(mc.simple_poll);
1073
1047
return;
1074
1048
1081
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
1056
name, type, domain, protocol, 0,
1083
1057
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
1060
break;
1088
1061
1089
1062
case AVAHI_BROWSER_REMOVE:
1092
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
1067
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1097
1069
}
1098
1070
break;
1099
1071
}
1138
1110
/* Reject the loopback device */
1139
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
1112
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1143
1115
}
1144
1116
return false;
1145
1117
}
1146
1118
/* Accept point-to-point devices only if connect_to is specified */
1147
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
1120
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1151
1123
}
1152
1124
return true;
1153
1125
}
1154
1126
/* Otherwise, reject non-broadcast-capable devices */
1155
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
1128
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1159
1131
}
1160
1132
return false;
1161
1133
}
1162
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
1135
if(ifr->ifr_flags & IFF_NOARP){
1164
1136
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1167
1138
}
1168
1139
return false;
1169
1140
}
1170
1141
1171
1142
/* Accept this device */
1172
1143
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1174
1145
}
1175
1146
return true;
1176
1147
}
1181
1152
* (This function is passed to scandir(3) as a filter function.)
1182
1153
*/
1183
1154
int good_interface(const struct dirent *if_entry){
1155
int ret;
1184
1156
if(if_entry->d_name[0] == '.'){
1185
1157
return 0;
1186
1158
}
1187
1188
1159
struct ifreq ifr;
1160
1189
1161
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
}
1194
1162
return 0;
1195
1163
}
1196
1164
1206
1174
* (This function is passed to scandir(3) as a filter function.)
1207
1175
*/
1208
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1209
1179
if(if_entry->d_name[0] == '.'){
1210
1180
return 0;
1211
1181
}
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
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1222
1245
/* Reject down interfaces */
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;
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1242
1278
}
1243
1279
return 1;
1244
1280
}
1257
1293
/* Is this directory entry a runnable program? */
1258
1294
int runnable_hook(const struct dirent *direntry){
1259
1295
int ret;
1260
size_t sret;
1261
1296
struct stat st;
1262
1297
1263
1298
if((direntry->d_name)[0] == '\0'){
1265
1300
return 0;
1266
1301
}
1267
1302
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);
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1289
1320
if(ret == -1){
1290
1321
if(debug){
1291
perror_plus("Could not stat hook");
1322
perror_plus("Could not stat plugin");
1292
1323
}
1293
1324
return 0;
1294
1325
}
1295
if(not (S_ISREG(st.st_mode))){
1326
if(not (st.st_mode & S_ISREG)){
1296
1327
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
1328
return 0;
1302
1329
}
1303
1330
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
1331
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
1332
return 0;
1310
1333
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
1334
return 1;
1316
1335
}
1317
1336
1324
1343
while(true){
1325
1344
if(mc.current_server == NULL){
1326
1345
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1329
1348
}
1330
1349
ret = avahi_simple_poll_iterate(s, -1);
1331
1350
} else {
1332
1351
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1335
1354
}
1336
1355
/* the current time */
1337
1356
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1353
1372
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1373
1355
1374
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1358
1376
}
1359
1377
1360
1378
if(block_time <= 0){
1380
1398
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1399
}
1382
1400
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1401
if (ret > 0 or errno != EINTR) {
1384
1402
return (ret != 1) ? ret : 0;
1385
1403
}
1386
1404
}
1387
1405
}
1388
1406
}
1389
1407
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
1526
1408
int main(int argc, char *argv[]){
1527
1409
AvahiSServiceBrowser *sb = NULL;
1528
1410
int error;
1608
1490
.group = 2 },
1609
1491
{ .name = "retry", .key = 132,
1610
1492
.arg = "SECONDS",
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",
1493
.doc = "Retry interval used when denied by the mandos server",
1616
1494
.group = 2 },
1617
1495
/*
1618
1496
* These reproduce what we would get without ARGP_NO_HELP
1672
1550
argp_error(state, "Bad retry interval");
1673
1551
}
1674
1552
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1678
1553
/*
1679
1554
* These reproduce what we would get without ARGP_NO_HELP
1680
1555
*/
1686
1561
argp_state_help(state, state->out_stream,
1687
1562
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
1563
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
1690
1565
exit(argp_err_exit_status);
1691
1566
break;
1692
1567
default:
1719
1594
{
1720
1595
/* Work around Debian bug #633582:
1721
1596
<http://bugs.debian.org/633582> */
1597
struct stat st;
1722
1598
1723
1599
/* Re-raise priviliges */
1724
1600
errno = 0;
1725
1601
ret = seteuid(0);
1726
1602
if(ret == -1){
1727
1603
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
}
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1779
1651
}
1780
1652
}
1781
1653
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
1685
goto end;
1686
}
1687
}
1688
close(devnull);
1785
1689
}
1786
1690
1787
1691
if(not debug){
1790
1694
1791
1695
if(interface[0] == '\0'){
1792
1696
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1795
1698
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
}
1802
1699
if(ret >= 1){
1803
/* Pick the first interface returned */
1700
/* Pick the first good interface */
1804
1701
interface = strdup(direntries[0]->d_name);
1805
1702
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1807
1704
}
1808
1705
if(interface == NULL){
1809
1706
perror_plus("malloc");
1814
1711
free(direntries);
1815
1712
} else {
1816
1713
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1714
fprintf(stderr, "Could not find a network interface\n");
1818
1715
exitcode = EXIT_FAILURE;
1819
1716
goto end;
1820
1717
}
1826
1723
srand((unsigned int) time(NULL));
1827
1724
mc.simple_poll = avahi_simple_poll_new();
1828
1725
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1831
1727
exitcode = EX_UNAVAILABLE;
1832
1728
goto end;
1833
1729
}
1899
1795
if(strcmp(interface, "none") != 0){
1900
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
1797
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1903
1799
exitcode = EX_UNAVAILABLE;
1904
1800
goto end;
1905
1801
}
2025
1921
#endif /* __linux__ */
2026
1922
/* Lower privileges */
2027
1923
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
} else {
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
2032
1936
}
2033
1937
}
2034
1938
2038
1942
2039
1943
ret = init_gnutls_global(pubkey, seckey);
2040
1944
if(ret == -1){
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1945
fprintf(stderr, "init_gnutls_global failed\n");
2042
1946
exitcode = EX_UNAVAILABLE;
2043
1947
goto end;
2044
1948
} else {
2060
1964
}
2061
1965
2062
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1967
fprintf(stderr, "init_gpgme failed\n");
2064
1968
exitcode = EX_UNAVAILABLE;
2065
1969
goto end;
2066
1970
} else {
2076
1980
/* (Mainly meant for debugging) */
2077
1981
char *address = strrchr(connect_to, ':');
2078
1982
if(address == NULL){
2079
fprintf_plus(stderr, "No colon in address\n");
1983
fprintf(stderr, "No colon in address\n");
2080
1984
exitcode = EX_USAGE;
2081
1985
goto end;
2082
1986
}
2090
1994
tmpmax = strtoimax(address+1, &tmp, 10);
2091
1995
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
1996
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
1997
fprintf(stderr, "Bad port number\n");
2094
1998
exitcode = EX_USAGE;
2095
1999
goto end;
2096
2000
}
2126
2030
break;
2127
2031
}
2128
2032
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2131
2035
}
2132
2036
sleep((int)retry_interval);
2133
2037
}
2163
2067
2164
2068
/* Check if creating the Avahi server object succeeded */
2165
2069
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
2168
2072
exitcode = EX_UNAVAILABLE;
2169
2073
goto end;
2170
2074
}
2178
2082
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
2083
NULL, 0, browse_callback, NULL);
2180
2084
if(sb == NULL){
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
2183
2087
exitcode = EX_UNAVAILABLE;
2184
2088
goto end;
2185
2089
}
2191
2095
/* Run the main loop */
2192
2096
2193
2097
if(debug){
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2098
fprintf(stderr, "Starting Avahi loop search\n");
2195
2099
}
2196
2100
2197
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
2102
(int)(retry_interval * 1000));
2199
2103
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2202
2106
}
2203
2107
2204
2108
end:
2205
2109
2206
2110
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2111
fprintf(stderr, "%s exiting\n", argv[0]);
2208
2112
}
2209
2113
2210
2114
/* Cleanup things */
2226
2130
if(gpgme_initialized){
2227
2131
gpgme_release(mc.ctx);
2228
2132
}
2229
2133
2230
2134
/* Cleans up the circular linked list of Mandos servers the client
2231
2135
has seen */
2232
2136
if(mc.current_server != NULL){
2238
2142
}
2239
2143
}
2240
2144
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2145
/* XXX run network hooks "stop" here */
2243
2146
2244
/* Re-raise priviliges */
2245
{
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2246
2150
errno = 0;
2247
2151
ret = seteuid(0);
2248
2152
if(ret == -1){
2249
2153
perror_plus("seteuid");
2250
2154
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2155
if(geteuid() == 0){
2254
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
2157
if(ret == -1){
2256
2158
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2159
} else if(network.ifr_flags & IFF_UP) {
2258
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
2162
if(ret == -1){
2265
2167
if(ret == -1){
2266
2168
perror_plus("close");
2267
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
2268
2176
}
2269
2177
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
2178
2277
2179
/* Removes the GPGME temp directory and all files inside */
2278
2180
if(tempdir_created){
2292
2194
}
2293
2195
ret = remove(fullname);
2294
2196
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2198
strerror(errno));
2297
2199
}
2298
2200
free(fullname);
2299
2201
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0