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- Committer: Teddy Hogeborn
- Date: 2012-01-01 04:53:54 UTC
- mfrom: (237.7.95 trunk)
- Revision ID: teddy@recompile.se-20120101045354-mr3k5cvc3mvq7pyc
merge from trunk
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
76
setgid(), pause(), _exit() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
88
91
89
92
#ifdef __linux__
90
93
#include <sys/klog.h> /* klogctl() */
108
111
init_gnutls_session(),
109
112
GNUTLS_* */
110
113
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
113
116
114
117
/* GPGME */
115
118
#include <gpgme.h> /* All GPGME types, constants and
123
126
#define PATHDIR "/conf/conf.d/mandos"
124
127
#define SECKEY "seckey.txt"
125
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
130
127
131
bool debug = false;
128
132
static const char mandos_protocol_version[] = "1";
130
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
135
static const char sys_class_net[] = "/sys/class/net";
132
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
133
138
134
139
/* Doubly linked list that need to be circularly linked when used */
135
140
typedef struct server{
165
170
166
171
/* Function to use when printing errors */
167
172
void perror_plus(const char *print_text){
173
int e = errno;
168
174
fprintf(stderr, "Mandos plugin %s: ",
169
175
program_invocation_short_name);
176
errno = e;
170
177
perror(print_text);
171
178
}
172
179
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
173
190
/*
174
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
192
* bytes. "buffer_capacity" is how much is currently allocated,
176
193
* "buffer_length" is how much is already used.
177
194
*/
178
195
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
196
size_t buffer_capacity){
180
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
199
if(buffer == NULL){
188
205
}
189
206
190
207
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
194
210
int ret;
195
211
server *new_server = malloc(sizeof(server));
196
212
if(new_server == NULL){
197
213
perror_plus("malloc");
198
return -1;
214
return false;
199
215
}
200
216
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
217
.port = port,
218
.if_index = if_index,
219
.af = af };
204
220
if(new_server->ip == NULL){
205
221
perror_plus("strdup");
206
return -1;
222
return false;
207
223
}
208
224
/* Special case of first server */
209
225
if (mc.current_server == NULL){
220
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
237
if(ret == -1){
222
238
perror_plus("clock_gettime");
223
return -1;
239
return false;
224
240
}
225
return 0;
241
return true;
226
242
}
227
243
228
244
/*
229
245
* Initialize GPGME.
230
246
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
233
249
gpgme_error_t rc;
234
250
gpgme_engine_info_t engine_info;
235
251
250
266
251
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
268
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
255
271
return false;
256
272
}
257
273
258
274
rc = gpgme_op_import(mc.ctx, pgp_data);
259
275
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
262
278
return false;
263
279
}
264
280
271
287
}
272
288
273
289
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
275
291
}
276
292
277
293
/* Init GPGME */
278
294
gpgme_check_version(NULL);
279
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
296
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
283
299
return false;
284
300
}
285
301
286
302
/* Set GPGME home directory for the OpenPGP engine only */
287
303
rc = gpgme_get_engine_info(&engine_info);
288
304
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
291
307
return false;
292
308
}
293
309
while(engine_info != NULL){
299
315
engine_info = engine_info->next;
300
316
}
301
317
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
303
320
return false;
304
321
}
305
322
306
323
/* Create new GPGME "context" */
307
324
rc = gpgme_new(&(mc.ctx));
308
325
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
311
329
return false;
312
330
}
313
331
332
350
ssize_t plaintext_length = 0;
333
351
334
352
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
354
}
337
355
338
356
/* Create new GPGME data buffer from memory cryptotext */
339
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
358
0);
341
359
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
344
362
return -1;
345
363
}
346
364
347
365
/* Create new empty GPGME data buffer for the plaintext */
348
366
rc = gpgme_data_new(&dh_plain);
349
367
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
352
371
gpgme_data_release(dh_crypto);
353
372
return -1;
354
373
}
357
376
data buffer */
358
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
378
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
362
381
plaintext_length = -1;
363
382
if(debug){
364
383
gpgme_decrypt_result_t result;
365
384
result = gpgme_op_decrypt_result(mc.ctx);
366
385
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
387
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
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);
373
392
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
394
}
376
395
gpgme_recipient_t recipient;
377
396
recipient = result->recipients;
378
397
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
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");
385
405
recipient = recipient->next;
386
406
}
387
407
}
390
410
}
391
411
392
412
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
414
}
395
415
396
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
423
*plaintext = NULL;
404
424
while(true){
405
425
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
408
428
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
412
432
}
413
433
414
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
447
}
428
448
429
449
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
431
451
for(ssize_t i = 0; i < plaintext_length; i++){
432
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
453
}
455
475
/* GnuTLS log function callback */
456
476
static void debuggnutls(__attribute__((unused)) int level,
457
477
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
459
479
}
460
480
461
481
static int init_gnutls_global(const char *pubkeyfilename,
463
483
int ret;
464
484
465
485
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
487
}
468
488
469
489
ret = gnutls_global_init();
470
490
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
473
493
return -1;
474
494
}
475
495
484
504
/* OpenPGP credentials */
485
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
506
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
489
509
gnutls_global_deinit();
490
510
return -1;
491
511
}
492
512
493
513
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
497
518
}
498
519
499
520
ret = gnutls_certificate_set_openpgp_key_file
500
521
(mc.cred, pubkeyfilename, seckeyfilename,
501
522
GNUTLS_OPENPGP_FMT_BASE64);
502
523
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
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));
508
529
goto globalfail;
509
530
}
510
531
511
532
/* GnuTLS server initialization */
512
533
ret = gnutls_dh_params_init(&mc.dh_params);
513
534
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
516
538
goto globalfail;
517
539
}
518
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
541
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
522
544
goto globalfail;
523
545
}
524
546
544
566
}
545
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
568
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
549
572
}
550
573
551
574
{
558
581
}
559
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
583
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
564
587
gnutls_deinit(*session);
565
588
return -1;
566
589
}
575
598
}
576
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
600
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
580
603
gnutls_deinit(*session);
581
604
return -1;
582
605
}
627
650
pf = PF_INET;
628
651
break;
629
652
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
654
errno = EINVAL;
632
655
return -1;
633
656
}
638
661
}
639
662
640
663
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
643
666
}
644
667
645
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
694
}
672
695
if(ret == 0){
673
696
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
698
errno = e;
676
699
goto mandos_end;
677
700
}
682
705
683
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
708
-Wunreachable-code*/
686
709
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
689
712
errno = EINVAL;
690
713
goto mandos_end;
691
714
}
709
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
733
perror_plus("if_indextoname");
711
734
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
714
737
}
715
738
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
718
741
}
719
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
753
perror_plus("inet_ntop");
731
754
} else {
732
755
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
757
}
735
758
}
736
759
}
764
787
while(true){
765
788
size_t out_size = strlen(out);
766
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
790
out_size - written));
768
791
if(ret == -1){
769
792
int e = errno;
770
793
perror_plus("write");
790
813
}
791
814
792
815
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
817
}
795
818
796
819
if(quit_now){
816
839
817
840
if(ret != GNUTLS_E_SUCCESS){
818
841
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
843
gnutls_perror(ret);
821
844
}
822
845
errno = EPROTO;
826
849
/* Read OpenPGP packet that contains the wanted password */
827
850
828
851
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
831
854
}
832
855
833
856
while(true){
838
861
}
839
862
840
863
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
864
buffer_capacity);
842
865
if(buffer_capacity == 0){
843
866
int e = errno;
844
867
perror_plus("incbuffer");
871
894
}
872
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
896
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
875
899
gnutls_perror(ret);
876
900
errno = EPROTO;
877
901
goto mandos_end;
878
902
}
879
903
break;
880
904
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
883
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
908
errno = EIO;
885
909
goto mandos_end;
890
914
}
891
915
892
916
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
917
fprintf_plus(stderr, "Closing TLS session\n");
894
918
}
895
919
896
920
if(quit_now){
908
932
909
933
if(buffer_length > 0){
910
934
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
913
936
&decrypted_buffer);
914
937
if(decrypted_buffer_size >= 0){
915
938
926
949
if(ret == 0 and ferror(stdout)){
927
950
int e = errno;
928
951
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
931
954
}
932
955
errno = e;
933
956
goto mandos_end;
990
1013
switch(event){
991
1014
default:
992
1015
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
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)));
996
1020
break;
997
1021
998
1022
case AVAHI_RESOLVER_FOUND:
1000
1024
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1025
avahi_address_snprint(ip, sizeof(ip), address);
1002
1026
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
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);
1006
1030
}
1007
1031
int ret = start_mandos_communication(ip, port, interface,
1008
1032
avahi_proto_to_af(proto));
1009
1033
if(ret == 0){
1010
1034
avahi_simple_poll_quit(mc.simple_poll);
1011
1035
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1014
1041
}
1015
1042
}
1016
1043
}
1040
1067
default:
1041
1068
case AVAHI_BROWSER_FAILURE:
1042
1069
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1045
1072
avahi_simple_poll_quit(mc.simple_poll);
1046
1073
return;
1047
1074
1054
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
1082
name, type, domain, protocol, 0,
1056
1083
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1059
1087
break;
1060
1088
1061
1089
case AVAHI_BROWSER_REMOVE:
1064
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1094
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1068
1097
}
1069
1098
break;
1070
1099
}
1085
1114
errno = old_errno;
1086
1115
}
1087
1116
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){
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1144
1128
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1129
perror_plus("ioctl SIOCGIFFLAGS");
1147
1130
}
1148
free(flagstring);
1149
return 0;
1131
return false;
1150
1132
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1153
1138
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1155
1140
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1158
1143
}
1159
return 0;
1144
return false;
1160
1145
}
1161
1146
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1163
1148
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1166
1151
}
1167
return 1;
1152
return true;
1168
1153
}
1169
1154
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1171
1156
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1174
1159
}
1175
return 0;
1160
return false;
1176
1161
}
1177
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1163
if(ifr->ifr_flags & IFF_NOARP){
1179
1164
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1182
1167
}
1183
return 0;
1168
return false;
1184
1169
}
1170
1185
1171
/* Accept this device */
1186
1172
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
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
1222
/* 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;
1189
1242
}
1190
1243
return 1;
1191
1244
}
1201
1254
return 1;
1202
1255
}
1203
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
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);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1204
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
1319
int ret;
1206
1320
struct timespec now;
1210
1324
while(true){
1211
1325
if(mc.current_server == NULL){
1212
1326
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1215
1329
}
1216
1330
ret = avahi_simple_poll_iterate(s, -1);
1217
1331
} else {
1218
1332
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1221
1335
}
1222
1336
/* the current time */
1223
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1239
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1354
1241
1355
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1243
1358
}
1244
1359
1245
1360
if(block_time <= 0){
1265
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1381
}
1267
1382
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1383
if (ret > 0 or errno != EINTR){
1269
1384
return (ret != 1) ? ret : 0;
1270
1385
}
1271
1386
}
1272
1387
}
1273
1388
}
1274
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
1275
1526
int main(int argc, char *argv[]){
1276
1527
AvahiSServiceBrowser *sb = NULL;
1277
1528
int error;
1357
1608
.group = 2 },
1358
1609
{ .name = "retry", .key = 132,
1359
1610
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1361
1616
.group = 2 },
1362
1617
/*
1363
1618
* These reproduce what we would get without ARGP_NO_HELP
1417
1672
argp_error(state, "Bad retry interval");
1418
1673
}
1419
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1420
1678
/*
1421
1679
* These reproduce what we would get without ARGP_NO_HELP
1422
1680
*/
1428
1686
argp_state_help(state, state->out_stream,
1429
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1688
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1690
exit(argp_err_exit_status);
1433
1691
break;
1434
1692
default:
1461
1719
{
1462
1720
/* Work around Debian bug #633582:
1463
1721
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1722
1466
1723
/* Re-raise priviliges */
1467
1724
errno = 0;
1468
1725
ret = seteuid(0);
1469
1726
if(ret == -1){
1470
1727
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
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
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1519
1785
}
1520
1786
1521
1787
if(not debug){
1522
1788
avahi_set_log_function(empty_log);
1523
1789
}
1524
1790
1525
1791
if(interface[0] == '\0'){
1526
1792
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1528
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1529
1802
if(ret >= 1){
1530
/* Pick the first good interface */
1803
/* Pick the first interface returned */
1531
1804
interface = strdup(direntries[0]->d_name);
1532
1805
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1534
1807
}
1535
1808
if(interface == NULL){
1536
1809
perror_plus("malloc");
1541
1814
free(direntries);
1542
1815
} else {
1543
1816
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1545
1818
exitcode = EXIT_FAILURE;
1546
1819
goto end;
1547
1820
}
1553
1826
srand((unsigned int) time(NULL));
1554
1827
mc.simple_poll = avahi_simple_poll_new();
1555
1828
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1557
1831
exitcode = EX_UNAVAILABLE;
1558
1832
goto end;
1559
1833
}
1625
1899
if(strcmp(interface, "none") != 0){
1626
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1901
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1629
1903
exitcode = EX_UNAVAILABLE;
1630
1904
goto end;
1631
1905
}
1751
2025
#endif /* __linux__ */
1752
2026
/* Lower privileges */
1753
2027
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1766
2032
}
1767
2033
}
1768
2034
1772
2038
1773
2039
ret = init_gnutls_global(pubkey, seckey);
1774
2040
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2042
exitcode = EX_UNAVAILABLE;
1777
2043
goto end;
1778
2044
} else {
1794
2060
}
1795
2061
1796
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2064
exitcode = EX_UNAVAILABLE;
1799
2065
goto end;
1800
2066
} else {
1810
2076
/* (Mainly meant for debugging) */
1811
2077
char *address = strrchr(connect_to, ':');
1812
2078
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2079
fprintf_plus(stderr, "No colon in address\n");
1814
2080
exitcode = EX_USAGE;
1815
2081
goto end;
1816
2082
}
1824
2090
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
2092
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2093
fprintf_plus(stderr, "Bad port number\n");
1828
2094
exitcode = EX_USAGE;
1829
2095
goto end;
1830
2096
}
1860
2126
break;
1861
2127
}
1862
2128
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
1865
2131
}
1866
2132
sleep((int)retry_interval);
1867
2133
}
1869
2135
if (not quit_now){
1870
2136
exitcode = EXIT_SUCCESS;
1871
2137
}
1872
2138
1873
2139
goto end;
1874
2140
}
1875
2141
1897
2163
1898
2164
/* Check if creating the Avahi server object succeeded */
1899
2165
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
1902
2168
exitcode = EX_UNAVAILABLE;
1903
2169
goto end;
1904
2170
}
1912
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
2179
NULL, 0, browse_callback, NULL);
1914
2180
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
1917
2183
exitcode = EX_UNAVAILABLE;
1918
2184
goto end;
1919
2185
}
1925
2191
/* Run the main loop */
1926
2192
1927
2193
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2195
}
1930
2196
1931
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
2198
(int)(retry_interval * 1000));
1933
2199
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
1936
2202
}
1937
2203
1938
2204
end:
1939
2205
1940
2206
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2208
}
1943
2209
1944
2210
/* Cleanup things */
1960
2226
if(gpgme_initialized){
1961
2227
gpgme_release(mc.ctx);
1962
2228
}
1963
2229
1964
2230
/* Cleans up the circular linked list of Mandos servers the client
1965
2231
has seen */
1966
2232
if(mc.current_server != NULL){
1972
2238
}
1973
2239
}
1974
2240
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1978
2246
errno = 0;
1979
2247
ret = seteuid(0);
1980
2248
if(ret == -1){
1981
2249
perror_plus("seteuid");
1982
2250
}
1983
if(geteuid() == 0){
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1984
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
2255
if(ret == -1){
1986
2256
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
2257
} else if(network.ifr_flags & IFF_UP){
1988
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
2260
if(ret == -1){
1995
2265
if(ret == -1){
1996
2266
perror_plus("close");
1997
2267
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
2268
}
2005
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2006
2276
2007
2277
/* Removes the GPGME temp directory and all files inside */
2008
2278
if(tempdir_created){
2022
2292
}
2023
2293
ret = remove(fullname);
2024
2294
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2027
2297
}
2028
2298
free(fullname);
2029
2299
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0