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- Committer: Teddy Hogeborn
- Date: 2012-05-17 01:55:58 UTC
- Revision ID: teddy@recompile.se-20120517015558-5703p8nkquc2rhgd
* .bzrignore (statedir): Added.
- files added:
- debian/source/local-options
- network-hooks.d
- files modified:
- .bzrignore
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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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";
129
133
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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){
187
204
return buffer_capacity;
188
205
}
189
206
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
207
/* 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){
193
210
int ret;
194
211
server *new_server = malloc(sizeof(server));
195
212
if(new_server == NULL){
196
213
perror_plus("malloc");
197
return -1;
214
return false;
198
215
}
199
216
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
217
.port = port,
218
.if_index = if_index,
219
.af = af };
203
220
if(new_server->ip == NULL){
204
221
perror_plus("strdup");
205
return -1;
222
return false;
206
223
}
207
/* unique case of first server */
224
/* Special case of first server */
208
225
if (mc.current_server == NULL){
209
226
new_server->next = new_server;
210
227
new_server->prev = new_server;
211
228
mc.current_server = new_server;
212
/* Placing the new server last in the list */
229
/* Place the new server last in the list */
213
230
} else {
214
231
new_server->next = mc.current_server;
215
232
new_server->prev = mc.current_server->prev;
219
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
237
if(ret == -1){
221
238
perror_plus("clock_gettime");
222
return -1;
239
return false;
223
240
}
224
return 0;
241
return true;
225
242
}
226
243
227
244
/*
228
245
* Initialize GPGME.
229
246
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
232
249
gpgme_error_t rc;
233
250
gpgme_engine_info_t engine_info;
234
251
249
266
250
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
268
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
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));
254
271
return false;
255
272
}
256
273
257
274
rc = gpgme_op_import(mc.ctx, pgp_data);
258
275
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
261
278
return false;
262
279
}
263
280
270
287
}
271
288
272
289
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
274
291
}
275
292
276
293
/* Init GPGME */
277
294
gpgme_check_version(NULL);
278
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
296
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
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));
282
299
return false;
283
300
}
284
301
285
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
286
303
rc = gpgme_get_engine_info(&engine_info);
287
304
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
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));
290
307
return false;
291
308
}
292
309
while(engine_info != NULL){
298
315
engine_info = engine_info->next;
299
316
}
300
317
if(engine_info == NULL){
301
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);
302
320
return false;
303
321
}
304
322
305
323
/* Create new GPGME "context" */
306
324
rc = gpgme_new(&(mc.ctx));
307
325
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
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));
310
329
return false;
311
330
}
312
331
331
350
ssize_t plaintext_length = 0;
332
351
333
352
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
354
}
336
355
337
356
/* Create new GPGME data buffer from memory cryptotext */
338
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
358
0);
340
359
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
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));
343
362
return -1;
344
363
}
345
364
346
365
/* Create new empty GPGME data buffer for the plaintext */
347
366
rc = gpgme_data_new(&dh_plain);
348
367
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
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));
351
371
gpgme_data_release(dh_crypto);
352
372
return -1;
353
373
}
356
376
data buffer */
357
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
358
378
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
361
381
plaintext_length = -1;
362
382
if(debug){
363
383
gpgme_decrypt_result_t result;
364
384
result = gpgme_op_decrypt_result(mc.ctx);
365
385
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
387
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
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);
372
392
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
394
}
375
395
gpgme_recipient_t recipient;
376
396
recipient = result->recipients;
377
397
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "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");
384
405
recipient = recipient->next;
385
406
}
386
407
}
389
410
}
390
411
391
412
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
414
}
394
415
395
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
423
*plaintext = NULL;
403
424
while(true){
404
425
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
407
428
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
411
432
}
412
433
413
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
447
}
427
448
428
449
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
430
451
for(ssize_t i = 0; i < plaintext_length; i++){
431
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
453
}
454
475
/* GnuTLS log function callback */
455
476
static void debuggnutls(__attribute__((unused)) int level,
456
477
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
458
479
}
459
480
460
481
static int init_gnutls_global(const char *pubkeyfilename,
462
483
int ret;
463
484
464
485
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
487
}
467
488
468
489
ret = gnutls_global_init();
469
490
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
472
493
return -1;
473
494
}
474
495
483
504
/* OpenPGP credentials */
484
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
485
506
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
488
509
gnutls_global_deinit();
489
510
return -1;
490
511
}
491
512
492
513
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
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);
496
518
}
497
519
498
520
ret = gnutls_certificate_set_openpgp_key_file
499
521
(mc.cred, pubkeyfilename, seckeyfilename,
500
522
GNUTLS_OPENPGP_FMT_BASE64);
501
523
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
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));
507
529
goto globalfail;
508
530
}
509
531
510
532
/* GnuTLS server initialization */
511
533
ret = gnutls_dh_params_init(&mc.dh_params);
512
534
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
515
538
goto globalfail;
516
539
}
517
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
541
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
521
544
goto globalfail;
522
545
}
523
546
543
566
}
544
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
568
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
548
572
}
549
573
550
574
{
557
581
}
558
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
583
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
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));
563
587
gnutls_deinit(*session);
564
588
return -1;
565
589
}
574
598
}
575
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
600
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
579
603
gnutls_deinit(*session);
580
604
return -1;
581
605
}
626
650
pf = PF_INET;
627
651
break;
628
652
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
654
errno = EINVAL;
631
655
return -1;
632
656
}
637
661
}
638
662
639
663
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
642
666
}
643
667
644
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
694
}
671
695
if(ret == 0){
672
696
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
698
errno = e;
675
699
goto mandos_end;
676
700
}
681
705
682
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
708
-Wunreachable-code*/
685
709
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
688
712
errno = EINVAL;
689
713
goto mandos_end;
690
714
}
708
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
733
perror_plus("if_indextoname");
710
734
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
713
737
}
714
738
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
717
741
}
718
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
753
perror_plus("inet_ntop");
730
754
} else {
731
755
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
757
}
734
758
}
735
759
}
763
787
while(true){
764
788
size_t out_size = strlen(out);
765
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
790
out_size - written));
767
791
if(ret == -1){
768
792
int e = errno;
769
793
perror_plus("write");
789
813
}
790
814
791
815
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
817
}
794
818
795
819
if(quit_now){
815
839
816
840
if(ret != GNUTLS_E_SUCCESS){
817
841
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
843
gnutls_perror(ret);
820
844
}
821
845
errno = EPROTO;
825
849
/* Read OpenPGP packet that contains the wanted password */
826
850
827
851
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
830
854
}
831
855
832
856
while(true){
837
861
}
838
862
839
863
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
864
buffer_capacity);
841
865
if(buffer_capacity == 0){
842
866
int e = errno;
843
867
perror_plus("incbuffer");
870
894
}
871
895
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
896
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
874
899
gnutls_perror(ret);
875
900
errno = EPROTO;
876
901
goto mandos_end;
877
902
}
878
903
break;
879
904
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
882
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
908
errno = EIO;
884
909
goto mandos_end;
889
914
}
890
915
891
916
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
917
fprintf_plus(stderr, "Closing TLS session\n");
893
918
}
894
919
895
920
if(quit_now){
907
932
908
933
if(buffer_length > 0){
909
934
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
936
&decrypted_buffer);
913
937
if(decrypted_buffer_size >= 0){
914
938
925
949
if(ret == 0 and ferror(stdout)){
926
950
int e = errno;
927
951
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
930
954
}
931
955
errno = e;
932
956
goto mandos_end;
989
1013
switch(event){
990
1014
default:
991
1015
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
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)));
995
1020
break;
996
1021
997
1022
case AVAHI_RESOLVER_FOUND:
999
1024
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1025
avahi_address_snprint(ip, sizeof(ip), address);
1001
1026
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
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);
1005
1030
}
1006
1031
int ret = start_mandos_communication(ip, port, interface,
1007
1032
avahi_proto_to_af(proto));
1008
1033
if(ret == 0){
1009
1034
avahi_simple_poll_quit(mc.simple_poll);
1010
1035
} else {
1011
ret = add_server(ip, port, interface,
1012
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
}
1013
1041
}
1014
1042
}
1015
1043
}
1039
1067
default:
1040
1068
case AVAHI_BROWSER_FAILURE:
1041
1069
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1044
1072
avahi_simple_poll_quit(mc.simple_poll);
1045
1073
return;
1046
1074
1053
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1082
name, type, domain, protocol, 0,
1055
1083
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
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)));
1058
1087
break;
1059
1088
1060
1089
case AVAHI_BROWSER_REMOVE:
1063
1092
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1093
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1094
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1067
1097
}
1068
1098
break;
1069
1099
}
1084
1114
errno = old_errno;
1085
1115
}
1086
1116
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
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){
1143
1128
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1129
perror_plus("ioctl SIOCGIFFLAGS");
1146
1130
}
1147
free(flagstring);
1148
return 0;
1131
return false;
1149
1132
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1152
1138
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
1140
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1157
1143
}
1158
return 0;
1144
return false;
1159
1145
}
1160
1146
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
1148
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1165
1151
}
1166
return 1;
1152
return true;
1167
1153
}
1168
1154
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
1156
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1173
1159
}
1174
return 0;
1160
return false;
1175
1161
}
1176
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1163
if(ifr->ifr_flags & IFF_NOARP){
1178
1164
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1181
1167
}
1182
return 0;
1168
return false;
1183
1169
}
1170
1184
1171
/* Accept this device */
1185
1172
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
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;
1188
1242
}
1189
1243
return 1;
1190
1244
}
1200
1254
return 1;
1201
1255
}
1202
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
1203
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1319
int ret;
1205
1320
struct timespec now;
1206
1321
struct timespec waited_time;
1207
1322
intmax_t block_time;
1208
1323
1209
1324
while(true){
1210
1325
if(mc.current_server == NULL){
1211
1326
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1214
1329
}
1215
1330
ret = avahi_simple_poll_iterate(s, -1);
1216
1331
} else {
1217
1332
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1220
1335
}
1221
1336
/* the current time */
1222
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1236
1351
block_time = ((retry_interval
1237
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1354
1240
1355
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1242
1358
}
1243
1359
1244
1360
if(block_time <= 0){
1245
1361
ret = start_mandos_communication(mc.current_server->ip,
1246
1362
mc.current_server->port,
1264
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1381
}
1266
1382
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1383
if (ret > 0 or errno != EINTR){
1268
1384
return (ret != 1) ? ret : 0;
1269
1385
}
1270
1386
}
1271
1387
}
1272
1388
}
1273
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
1274
1526
int main(int argc, char *argv[]){
1275
1527
AvahiSServiceBrowser *sb = NULL;
1276
1528
int error;
1356
1608
.group = 2 },
1357
1609
{ .name = "retry", .key = 132,
1358
1610
.arg = "SECONDS",
1359
.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",
1360
1616
.group = 2 },
1361
1617
/*
1362
1618
* These reproduce what we would get without ARGP_NO_HELP
1411
1667
errno = 0;
1412
1668
retry_interval = strtod(arg, &tmp);
1413
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1415
1672
argp_error(state, "Bad retry interval");
1416
1673
}
1417
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1418
1678
/*
1419
1679
* These reproduce what we would get without ARGP_NO_HELP
1420
1680
*/
1426
1686
argp_state_help(state, state->out_stream,
1427
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
1688
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
1690
exit(argp_err_exit_status);
1431
1691
break;
1432
1692
default:
1459
1719
{
1460
1720
/* Work around Debian bug #633582:
1461
1721
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1722
1464
1723
/* Re-raise priviliges */
1465
1724
errno = 0;
1466
1725
ret = seteuid(0);
1467
1726
if(ret == -1){
1468
1727
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
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;
1513
1785
}
1514
1786
1515
1787
if(not debug){
1516
1788
avahi_set_log_function(empty_log);
1517
1789
}
1518
1790
1519
1791
if(interface[0] == '\0'){
1520
1792
struct dirent **direntries;
1521
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,
1522
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
}
1523
1802
if(ret >= 1){
1524
/* Pick the first good interface */
1803
/* Pick the first interface returned */
1525
1804
interface = strdup(direntries[0]->d_name);
1526
1805
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1528
1807
}
1529
1808
if(interface == NULL){
1530
1809
perror_plus("malloc");
1535
1814
free(direntries);
1536
1815
} else {
1537
1816
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1539
1818
exitcode = EXIT_FAILURE;
1540
1819
goto end;
1541
1820
}
1547
1826
srand((unsigned int) time(NULL));
1548
1827
mc.simple_poll = avahi_simple_poll_new();
1549
1828
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1551
1831
exitcode = EX_UNAVAILABLE;
1552
1832
goto end;
1553
1833
}
1619
1899
if(strcmp(interface, "none") != 0){
1620
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
1901
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1623
1903
exitcode = EX_UNAVAILABLE;
1624
1904
goto end;
1625
1905
}
1745
2025
#endif /* __linux__ */
1746
2026
/* Lower privileges */
1747
2027
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1760
2032
}
1761
2033
}
1762
2034
1766
2038
1767
2039
ret = init_gnutls_global(pubkey, seckey);
1768
2040
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2042
exitcode = EX_UNAVAILABLE;
1771
2043
goto end;
1772
2044
} else {
1788
2060
}
1789
2061
1790
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2064
exitcode = EX_UNAVAILABLE;
1793
2065
goto end;
1794
2066
} else {
1804
2076
/* (Mainly meant for debugging) */
1805
2077
char *address = strrchr(connect_to, ':');
1806
2078
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2079
fprintf_plus(stderr, "No colon in address\n");
1808
2080
exitcode = EX_USAGE;
1809
2081
goto end;
1810
2082
}
1818
2090
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
2092
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2093
fprintf_plus(stderr, "Bad port number\n");
1822
2094
exitcode = EX_USAGE;
1823
2095
goto end;
1824
2096
}
1829
2101
1830
2102
port = (uint16_t)tmpmax;
1831
2103
*address = '\0';
1832
address = connect_to;
1833
2104
/* Colon in address indicates IPv6 */
1834
2105
int af;
1835
if(strchr(address, ':') != NULL){
2106
if(strchr(connect_to, ':') != NULL){
1836
2107
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
1837
2114
} else {
1838
2115
af = AF_INET;
1839
2116
}
2117
address = connect_to;
1840
2118
1841
2119
if(quit_now){
1842
2120
goto end;
1843
2121
}
1844
2122
1845
2123
while(not quit_now){
1846
2124
ret = start_mandos_communication(address, port, if_index, af);
1847
2125
if(quit_now or ret == 0){
1848
2126
break;
1849
2127
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
1853
2135
if (not quit_now){
1854
2136
exitcode = EXIT_SUCCESS;
1855
2137
}
1856
2138
1857
2139
goto end;
1858
2140
}
1859
2141
1881
2163
1882
2164
/* Check if creating the Avahi server object succeeded */
1883
2165
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
1886
2168
exitcode = EX_UNAVAILABLE;
1887
2169
goto end;
1888
2170
}
1896
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
2179
NULL, 0, browse_callback, NULL);
1898
2180
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
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)));
1901
2183
exitcode = EX_UNAVAILABLE;
1902
2184
goto end;
1903
2185
}
1909
2191
/* Run the main loop */
1910
2192
1911
2193
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2195
}
1914
2196
1915
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
2198
(int)(retry_interval * 1000));
1917
2199
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
1920
2202
}
1921
2203
1922
2204
end:
1923
2205
1924
2206
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2208
}
1927
2209
1928
2210
/* Cleanup things */
1944
2226
if(gpgme_initialized){
1945
2227
gpgme_release(mc.ctx);
1946
2228
}
1947
2229
1948
2230
/* Cleans up the circular linked list of Mandos servers the client
1949
2231
has seen */
1950
2232
if(mc.current_server != NULL){
1956
2238
}
1957
2239
}
1958
2240
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1962
2246
errno = 0;
1963
2247
ret = seteuid(0);
1964
2248
if(ret == -1){
1965
2249
perror_plus("seteuid");
1966
2250
}
1967
if(geteuid() == 0){
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1968
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
2255
if(ret == -1){
1970
2256
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
2257
} else if(network.ifr_flags & IFF_UP){
1972
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
2260
if(ret == -1){
1979
2265
if(ret == -1){
1980
2266
perror_plus("close");
1981
2267
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
2268
}
1989
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
1990
2276
1991
2277
/* Removes the GPGME temp directory and all files inside */
1992
2278
if(tempdir_created){
1993
2279
struct dirent **direntries = NULL;
1994
2280
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
1998
2285
direntry = direntries[i];
1999
2286
char *fullname = NULL;
2000
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2005
2292
}
2006
2293
ret = remove(fullname);
2007
2294
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2010
2297
}
2011
2298
free(fullname);
2012
2299
}
2013
2300
}
2014
2301
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2302
/* need to clean even if 0 because man page doesn't specify */
2017
2303
free(direntries);
2018
if (ret == -1){
2304
if (numentries == -1){
2019
2305
perror_plus("scandir");
2020
2306
}
2021
2307
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0