To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 533
- compare with another revision
- download diff
- download tarball
- view history from revision 533
- Committer: teddy at bsnet
- Date: 2011-12-24 23:17:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224231702-1ffgu6r02p0bz9co
* plugins.d/splashy.c (error_plus): Check format string.
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
- files added:
- debian/source/local-options
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
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{
170
175
perror(print_text);
171
176
}
172
177
178
__attribute__((format (gnu_printf, 2, 3)))
179
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_list ap;
181
va_start (ap, format);
182
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
184
program_invocation_short_name));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
186
}
187
173
188
/*
174
189
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
190
* bytes. "buffer_capacity" is how much is currently allocated,
176
191
* "buffer_length" is how much is already used.
177
192
*/
178
193
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
194
size_t buffer_capacity){
180
195
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
197
if(buffer == NULL){
187
202
return buffer_capacity;
188
203
}
189
204
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
205
/* Add server to set of servers to retry periodically */
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
193
208
int ret;
194
209
server *new_server = malloc(sizeof(server));
195
210
if(new_server == NULL){
196
211
perror_plus("malloc");
197
return -1;
212
return false;
198
213
}
199
214
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
215
.port = port,
216
.if_index = if_index,
217
.af = af };
203
218
if(new_server->ip == NULL){
204
219
perror_plus("strdup");
205
return -1;
220
return false;
206
221
}
207
/* unique case of first server */
222
/* Special case of first server */
208
223
if (mc.current_server == NULL){
209
224
new_server->next = new_server;
210
225
new_server->prev = new_server;
211
226
mc.current_server = new_server;
212
/* Placing the new server last in the list */
227
/* Place the new server last in the list */
213
228
} else {
214
229
new_server->next = mc.current_server;
215
230
new_server->prev = mc.current_server->prev;
219
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
235
if(ret == -1){
221
236
perror_plus("clock_gettime");
222
return -1;
237
return false;
223
238
}
224
return 0;
239
return true;
225
240
}
226
241
227
242
/*
228
243
* Initialize GPGME.
229
244
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
232
247
gpgme_error_t rc;
233
248
gpgme_engine_info_t engine_info;
234
249
249
264
250
265
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
266
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));
267
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
268
gpgme_strsource(rc), gpgme_strerror(rc));
254
269
return false;
255
270
}
256
271
257
272
rc = gpgme_op_import(mc.ctx, pgp_data);
258
273
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
261
276
return false;
262
277
}
263
278
270
285
}
271
286
272
287
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
288
fprintf_plus(stderr, "Initializing GPGME\n");
274
289
}
275
290
276
291
/* Init GPGME */
277
292
gpgme_check_version(NULL);
278
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
294
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
295
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
296
gpgme_strsource(rc), gpgme_strerror(rc));
282
297
return false;
283
298
}
284
299
285
/* Set GPGME home directory for the OpenPGP engine only */
300
/* Set GPGME home directory for the OpenPGP engine only */
286
301
rc = gpgme_get_engine_info(&engine_info);
287
302
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
290
305
return false;
291
306
}
292
307
while(engine_info != NULL){
298
313
engine_info = engine_info->next;
299
314
}
300
315
if(engine_info == NULL){
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
317
tempdir);
302
318
return false;
303
319
}
304
320
305
321
/* Create new GPGME "context" */
306
322
rc = gpgme_new(&(mc.ctx));
307
323
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
326
gpgme_strerror(rc));
310
327
return false;
311
328
}
312
329
331
348
ssize_t plaintext_length = 0;
332
349
333
350
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
352
}
336
353
337
354
/* Create new GPGME data buffer from memory cryptotext */
338
355
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
356
0);
340
357
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));
358
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
359
gpgme_strsource(rc), gpgme_strerror(rc));
343
360
return -1;
344
361
}
345
362
346
363
/* Create new empty GPGME data buffer for the plaintext */
347
364
rc = gpgme_data_new(&dh_plain);
348
365
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
366
fprintf_plus(stderr, "Mandos plugin mandos-client: "
367
"bad gpgme_data_new: %s: %s\n",
368
gpgme_strsource(rc), gpgme_strerror(rc));
351
369
gpgme_data_release(dh_crypto);
352
370
return -1;
353
371
}
356
374
data buffer */
357
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
358
376
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
361
379
plaintext_length = -1;
362
380
if(debug){
363
381
gpgme_decrypt_result_t result;
364
382
result = gpgme_op_decrypt_result(mc.ctx);
365
383
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
385
} 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);
386
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf_plus(stderr, "Wrong key usage: %u\n",
389
result->wrong_key_usage);
372
390
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
391
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
392
}
375
393
gpgme_recipient_t recipient;
376
394
recipient = result->recipients;
377
395
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");
396
fprintf_plus(stderr, "Public key algorithm: %s\n",
397
gpgme_pubkey_algo_name
398
(recipient->pubkey_algo));
399
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
400
fprintf_plus(stderr, "Secret key available: %s\n",
401
recipient->status == GPG_ERR_NO_SECKEY
402
? "No" : "Yes");
384
403
recipient = recipient->next;
385
404
}
386
405
}
389
408
}
390
409
391
410
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
412
}
394
413
395
414
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
421
*plaintext = NULL;
403
422
while(true){
404
423
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
424
(size_t)plaintext_length,
425
plaintext_capacity);
407
426
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
427
perror_plus("incbuffer");
428
plaintext_length = -1;
429
goto decrypt_end;
411
430
}
412
431
413
432
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
445
}
427
446
428
447
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
448
fprintf_plus(stderr, "Decrypted password is: ");
430
449
for(ssize_t i = 0; i < plaintext_length; i++){
431
450
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
451
}
454
473
/* GnuTLS log function callback */
455
474
static void debuggnutls(__attribute__((unused)) int level,
456
475
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
476
fprintf_plus(stderr, "GnuTLS: %s", string);
458
477
}
459
478
460
479
static int init_gnutls_global(const char *pubkeyfilename,
462
481
int ret;
463
482
464
483
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
485
}
467
486
468
487
ret = gnutls_global_init();
469
488
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
489
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
490
safer_gnutls_strerror(ret));
472
491
return -1;
473
492
}
474
493
483
502
/* OpenPGP credentials */
484
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
485
504
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
506
safer_gnutls_strerror(ret));
488
507
gnutls_global_deinit();
489
508
return -1;
490
509
}
491
510
492
511
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
512
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
513
" secret key %s as GnuTLS credentials\n",
514
pubkeyfilename,
515
seckeyfilename);
496
516
}
497
517
498
518
ret = gnutls_certificate_set_openpgp_key_file
499
519
(mc.cred, pubkeyfilename, seckeyfilename,
500
520
GNUTLS_OPENPGP_FMT_BASE64);
501
521
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));
522
fprintf_plus(stderr,
523
"Error[%d] while reading the OpenPGP key pair ('%s',"
524
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
525
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
526
safer_gnutls_strerror(ret));
507
527
goto globalfail;
508
528
}
509
529
510
530
/* GnuTLS server initialization */
511
531
ret = gnutls_dh_params_init(&mc.dh_params);
512
532
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
534
" initialization: %s\n",
535
safer_gnutls_strerror(ret));
515
536
goto globalfail;
516
537
}
517
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
539
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
521
542
goto globalfail;
522
543
}
523
544
543
564
}
544
565
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
566
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr,
568
"Error in GnuTLS session initialization: %s\n",
569
safer_gnutls_strerror(ret));
548
570
}
549
571
550
572
{
557
579
}
558
580
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
581
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));
582
fprintf_plus(stderr, "Syntax error at: %s\n", err);
583
fprintf_plus(stderr, "GnuTLS error: %s\n",
584
safer_gnutls_strerror(ret));
563
585
gnutls_deinit(*session);
564
586
return -1;
565
587
}
574
596
}
575
597
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
598
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
599
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
600
safer_gnutls_strerror(ret));
579
601
gnutls_deinit(*session);
580
602
return -1;
581
603
}
626
648
pf = PF_INET;
627
649
break;
628
650
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
651
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
652
errno = EINVAL;
631
653
return -1;
632
654
}
637
659
}
638
660
639
661
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
663
PRIu16 "\n", ip, port);
642
664
}
643
665
644
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
692
}
671
693
if(ret == 0){
672
694
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
695
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
696
errno = e;
675
697
goto mandos_end;
676
698
}
681
703
682
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
706
-Wunreachable-code*/
685
707
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
708
fprintf_plus(stderr, "An IPv6 link-local address is"
709
" incomplete without a network interface\n");
688
710
errno = EINVAL;
689
711
goto mandos_end;
690
712
}
708
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
731
perror_plus("if_indextoname");
710
732
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
713
735
}
714
736
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
717
739
}
718
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
751
perror_plus("inet_ntop");
730
752
} else {
731
753
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
755
}
734
756
}
735
757
}
763
785
while(true){
764
786
size_t out_size = strlen(out);
765
787
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
788
out_size - written));
767
789
if(ret == -1){
768
790
int e = errno;
769
791
perror_plus("write");
789
811
}
790
812
791
813
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
815
}
794
816
795
817
if(quit_now){
815
837
816
838
if(ret != GNUTLS_E_SUCCESS){
817
839
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
841
gnutls_perror(ret);
820
842
}
821
843
errno = EPROTO;
825
847
/* Read OpenPGP packet that contains the wanted password */
826
848
827
849
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
850
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
851
" %s\n", ip);
830
852
}
831
853
832
854
while(true){
837
859
}
838
860
839
861
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
862
buffer_capacity);
841
863
if(buffer_capacity == 0){
842
864
int e = errno;
843
865
perror_plus("incbuffer");
870
892
}
871
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
894
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
896
"***\n");
874
897
gnutls_perror(ret);
875
898
errno = EPROTO;
876
899
goto mandos_end;
877
900
}
878
901
break;
879
902
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
903
fprintf_plus(stderr, "Unknown error while reading data from"
904
" encrypted session with Mandos server\n");
882
905
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
906
errno = EIO;
884
907
goto mandos_end;
889
912
}
890
913
891
914
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
915
fprintf_plus(stderr, "Closing TLS session\n");
893
916
}
894
917
895
918
if(quit_now){
907
930
908
931
if(buffer_length > 0){
909
932
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
934
&decrypted_buffer);
913
935
if(decrypted_buffer_size >= 0){
914
936
925
947
if(ret == 0 and ferror(stdout)){
926
948
int e = errno;
927
949
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
950
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
951
strerror(errno));
930
952
}
931
953
errno = e;
932
954
goto mandos_end;
989
1011
switch(event){
990
1012
default:
991
1013
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)));
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
domain,
1017
avahi_strerror(avahi_server_errno(mc.server)));
995
1018
break;
996
1019
997
1020
case AVAHI_RESOLVER_FOUND:
999
1022
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1023
avahi_address_snprint(ip, sizeof(ip), address);
1001
1024
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);
1025
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1027
host_name, ip, (intmax_t)interface, port);
1005
1028
}
1006
1029
int ret = start_mandos_communication(ip, port, interface,
1007
1030
avahi_proto_to_af(proto));
1008
1031
if(ret == 0){
1009
1032
avahi_simple_poll_quit(mc.simple_poll);
1010
1033
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1037
" list\n", name);
1038
}
1013
1039
}
1014
1040
}
1015
1041
}
1039
1065
default:
1040
1066
case AVAHI_BROWSER_FAILURE:
1041
1067
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1044
1070
avahi_simple_poll_quit(mc.simple_poll);
1045
1071
return;
1046
1072
1053
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1080
name, type, domain, protocol, 0,
1055
1081
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1083
" %s\n", name,
1084
avahi_strerror(avahi_server_errno(mc.server)));
1058
1085
break;
1059
1086
1060
1087
case AVAHI_BROWSER_REMOVE:
1063
1090
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1091
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1092
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1093
fprintf_plus(stderr, "No Mandos server found, still"
1094
" searching...\n");
1067
1095
}
1068
1096
break;
1069
1097
}
1084
1112
errno = old_errno;
1085
1113
}
1086
1114
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){
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1116
int ret;
1117
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1119
if(s < 0){
1120
perror_plus("socket");
1121
return false;
1122
}
1123
strcpy(ifr->ifr_name, ifname);
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1125
if(ret == -1){
1143
1126
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1127
perror_plus("ioctl SIOCGIFFLAGS");
1146
1128
}
1147
free(flagstring);
1148
return 0;
1129
return false;
1149
1130
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1131
return true;
1132
}
1133
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1135
1152
1136
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1137
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
1138
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1139
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
ifname);
1157
1141
}
1158
return 0;
1142
return false;
1159
1143
}
1160
1144
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1145
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
1146
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1147
fprintf_plus(stderr, "Accepting point-to-point interface"
1148
" \"%s\"\n", ifname);
1165
1149
}
1166
return 1;
1150
return true;
1167
1151
}
1168
1152
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1153
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
1154
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1155
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1156
" \"%s\"\n", ifname);
1173
1157
}
1174
return 0;
1158
return false;
1175
1159
}
1176
1160
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1161
if(ifr->ifr_flags & IFF_NOARP){
1178
1162
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1163
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
ifname);
1181
1165
}
1182
return 0;
1166
return false;
1183
1167
}
1168
1184
1169
/* Accept this device */
1185
1170
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1171
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
}
1173
return true;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int good_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface "
1190
"\"%s\"\n", if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
if(not good_flags(if_entry->d_name, &ifr)){
1196
return 0;
1197
}
1198
return 1;
1199
}
1200
1201
/*
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1188
1240
}
1189
1241
return 1;
1190
1242
}
1200
1252
return 1;
1201
1253
}
1202
1254
1255
/* Is this directory entry a runnable program? */
1256
int runnable_hook(const struct dirent *direntry){
1257
int ret;
1258
size_t sret;
1259
struct stat st;
1260
1261
if((direntry->d_name)[0] == '\0'){
1262
/* Empty name? */
1263
return 0;
1264
}
1265
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1267
"abcdefghijklmnopqrstuvwxyz"
1268
"0123456789"
1269
"_-");
1270
if((direntry->d_name)[sret] != '\0'){
1271
/* Contains non-allowed characters */
1272
if(debug){
1273
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
direntry->d_name);
1275
}
1276
return 0;
1277
}
1278
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1287
if(ret == -1){
1288
if(debug){
1289
perror_plus("Could not stat hook");
1290
}
1291
return 0;
1292
}
1293
if(not (S_ISREG(st.st_mode))){
1294
/* Not a regular file */
1295
if(debug){
1296
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
direntry->d_name);
1298
}
1299
return 0;
1300
}
1301
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1302
/* Not executable */
1303
if(debug){
1304
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
direntry->d_name);
1306
}
1307
return 0;
1308
}
1309
if(debug){
1310
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
direntry->d_name);
1312
}
1313
return 1;
1314
}
1315
1203
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1317
int ret;
1205
1318
struct timespec now;
1206
1319
struct timespec waited_time;
1207
1320
intmax_t block_time;
1208
1321
1209
1322
while(true){
1210
1323
if(mc.current_server == NULL){
1211
1324
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1325
fprintf_plus(stderr, "Wait until first server is found."
1326
" No timeout!\n");
1214
1327
}
1215
1328
ret = avahi_simple_poll_iterate(s, -1);
1216
1329
} else {
1217
1330
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1331
fprintf_plus(stderr, "Check current_server if we should run"
1332
" it, or wait\n");
1220
1333
}
1221
1334
/* the current time */
1222
1335
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1236
1349
block_time = ((retry_interval
1237
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1352
1240
1353
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1355
block_time);
1242
1356
}
1243
1357
1244
1358
if(block_time <= 0){
1245
1359
ret = start_mandos_communication(mc.current_server->ip,
1246
1360
mc.current_server->port,
1264
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1379
}
1266
1380
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1381
if (ret > 0 or errno != EINTR){
1268
1382
return (ret != 1) ? ret : 0;
1269
1383
}
1270
1384
}
1271
1385
}
1272
1386
}
1273
1387
1388
bool run_network_hooks(const char *mode, const char *interface,
1389
const float delay){
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1395
if(numhooks == -1){
1396
perror_plus("scandir");
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1404
perror_plus("asprintf");
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1473
free(delaystring);
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
1515
}
1516
1274
1517
int main(int argc, char *argv[]){
1275
1518
AvahiSServiceBrowser *sb = NULL;
1276
1519
int error;
1358
1601
.arg = "SECONDS",
1359
1602
.doc = "Retry interval used when denied by the mandos server",
1360
1603
.group = 2 },
1604
{ .name = "network-hook-dir", .key = 133,
1605
.arg = "DIR",
1606
.doc = "Directory where network hooks are located",
1607
.group = 2 },
1361
1608
/*
1362
1609
* These reproduce what we would get without ARGP_NO_HELP
1363
1610
*/
1411
1658
errno = 0;
1412
1659
retry_interval = strtod(arg, &tmp);
1413
1660
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1661
or (retry_interval * 1000) > INT_MAX
1662
or retry_interval < 0){
1415
1663
argp_error(state, "Bad retry interval");
1416
1664
}
1417
1665
break;
1666
case 133: /* --network-hook-dir */
1667
hookdir = arg;
1668
break;
1418
1669
/*
1419
1670
* These reproduce what we would get without ARGP_NO_HELP
1420
1671
*/
1426
1677
argp_state_help(state, state->out_stream,
1427
1678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
1679
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1680
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
1681
exit(argp_err_exit_status);
1431
1682
break;
1432
1683
default:
1459
1710
{
1460
1711
/* Work around Debian bug #633582:
1461
1712
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1713
1464
1714
/* Re-raise priviliges */
1465
1715
errno = 0;
1466
1716
ret = seteuid(0);
1467
1717
if(ret == -1){
1468
1718
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
}
1719
} else {
1720
struct stat st;
1721
1722
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1723
int seckey_fd = open(seckey, O_RDONLY);
1724
if(seckey_fd == -1){
1725
perror_plus("open");
1726
} else {
1727
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1728
if(ret == -1){
1729
perror_plus("fstat");
1730
} else {
1731
if(S_ISREG(st.st_mode)
1732
and st.st_uid == 0 and st.st_gid == 0){
1733
ret = fchown(seckey_fd, uid, gid);
1734
if(ret == -1){
1735
perror_plus("fchown");
1736
}
1737
}
1738
}
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
1740
}
1741
}
1742
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1744
int pubkey_fd = open(pubkey, O_RDONLY);
1745
if(pubkey_fd == -1){
1746
perror_plus("open");
1747
} else {
1748
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1749
if(ret == -1){
1750
perror_plus("fstat");
1751
} else {
1752
if(S_ISREG(st.st_mode)
1753
and st.st_uid == 0 and st.st_gid == 0){
1754
ret = fchown(pubkey_fd, uid, gid);
1755
if(ret == -1){
1756
perror_plus("fchown");
1757
}
1758
}
1759
}
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
1764
/* Lower privileges */
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
1769
}
1770
}
1771
}
1772
1773
/* Run network hooks */
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
1513
1776
}
1514
1777
1515
1778
if(not debug){
1516
1779
avahi_set_log_function(empty_log);
1517
1780
}
1518
1781
1519
1782
if(interface[0] == '\0'){
1520
1783
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1522
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1523
1793
if(ret >= 1){
1524
/* Pick the first good interface */
1794
/* Pick the first interface returned */
1525
1795
interface = strdup(direntries[0]->d_name);
1526
1796
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1528
1798
}
1529
1799
if(interface == NULL){
1530
1800
perror_plus("malloc");
1535
1805
free(direntries);
1536
1806
} else {
1537
1807
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1539
1809
exitcode = EXIT_FAILURE;
1540
1810
goto end;
1541
1811
}
1547
1817
srand((unsigned int) time(NULL));
1548
1818
mc.simple_poll = avahi_simple_poll_new();
1549
1819
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1820
fprintf_plus(stderr,
1821
"Avahi: Failed to create simple poll object.\n");
1551
1822
exitcode = EX_UNAVAILABLE;
1552
1823
goto end;
1553
1824
}
1619
1890
if(strcmp(interface, "none") != 0){
1620
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
1892
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1623
1894
exitcode = EX_UNAVAILABLE;
1624
1895
goto end;
1625
1896
}
1745
2016
#endif /* __linux__ */
1746
2017
/* Lower privileges */
1747
2018
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
}
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
1760
2023
}
1761
2024
}
1762
2025
1766
2029
1767
2030
ret = init_gnutls_global(pubkey, seckey);
1768
2031
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2033
exitcode = EX_UNAVAILABLE;
1771
2034
goto end;
1772
2035
} else {
1788
2051
}
1789
2052
1790
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2054
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2055
exitcode = EX_UNAVAILABLE;
1793
2056
goto end;
1794
2057
} else {
1804
2067
/* (Mainly meant for debugging) */
1805
2068
char *address = strrchr(connect_to, ':');
1806
2069
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2070
fprintf_plus(stderr, "No colon in address\n");
1808
2071
exitcode = EX_USAGE;
1809
2072
goto end;
1810
2073
}
1818
2081
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
2083
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2084
fprintf_plus(stderr, "Bad port number\n");
1822
2085
exitcode = EX_USAGE;
1823
2086
goto end;
1824
2087
}
1829
2092
1830
2093
port = (uint16_t)tmpmax;
1831
2094
*address = '\0';
1832
address = connect_to;
1833
2095
/* Colon in address indicates IPv6 */
1834
2096
int af;
1835
if(strchr(address, ':') != NULL){
2097
if(strchr(connect_to, ':') != NULL){
1836
2098
af = AF_INET6;
2099
/* Accept [] around IPv6 address - see RFC 5952 */
2100
if(connect_to[0] == '[' and address[-1] == ']')
2101
{
2102
connect_to++;
2103
address[-1] = '\0';
2104
}
1837
2105
} else {
1838
2106
af = AF_INET;
1839
2107
}
2108
address = connect_to;
1840
2109
1841
2110
if(quit_now){
1842
2111
goto end;
1843
2112
}
1844
2113
1845
2114
while(not quit_now){
1846
2115
ret = start_mandos_communication(address, port, if_index, af);
1847
2116
if(quit_now or ret == 0){
1848
2117
break;
1849
2118
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
2119
if(debug){
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2121
(int)retry_interval);
2122
}
2123
sleep((int)retry_interval);
2124
}
2125
1853
2126
if (not quit_now){
1854
2127
exitcode = EXIT_SUCCESS;
1855
2128
}
1856
2129
1857
2130
goto end;
1858
2131
}
1859
2132
1881
2154
1882
2155
/* Check if creating the Avahi server object succeeded */
1883
2156
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2158
avahi_strerror(error));
1886
2159
exitcode = EX_UNAVAILABLE;
1887
2160
goto end;
1888
2161
}
1896
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
2170
NULL, 0, browse_callback, NULL);
1898
2171
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
1901
2174
exitcode = EX_UNAVAILABLE;
1902
2175
goto end;
1903
2176
}
1909
2182
/* Run the main loop */
1910
2183
1911
2184
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2186
}
1914
2187
1915
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
2189
(int)(retry_interval * 1000));
1917
2190
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2192
(ret == 0) ? "successfully" : "with error");
1920
2193
}
1921
2194
1922
2195
end:
1923
2196
1924
2197
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2198
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2199
}
1927
2200
1928
2201
/* Cleanup things */
1944
2217
if(gpgme_initialized){
1945
2218
gpgme_release(mc.ctx);
1946
2219
}
1947
2220
1948
2221
/* Cleans up the circular linked list of Mandos servers the client
1949
2222
has seen */
1950
2223
if(mc.current_server != NULL){
1956
2229
}
1957
2230
}
1958
2231
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
2236
{
1962
2237
errno = 0;
1963
2238
ret = seteuid(0);
1964
2239
if(ret == -1){
1965
2240
perror_plus("seteuid");
1966
2241
}
1967
if(geteuid() == 0){
2242
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
1968
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
2246
if(ret == -1){
1970
2247
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
2248
} else if(network.ifr_flags & IFF_UP){
1972
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
2251
if(ret == -1){
1979
2256
if(ret == -1){
1980
2257
perror_plus("close");
1981
2258
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
2259
}
1989
2260
}
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
1990
2267
1991
2268
/* Removes the GPGME temp directory and all files inside */
1992
2269
if(tempdir_created){
1993
2270
struct dirent **direntries = NULL;
1994
2271
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
1998
2276
direntry = direntries[i];
1999
2277
char *fullname = NULL;
2000
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2005
2283
}
2006
2284
ret = remove(fullname);
2007
2285
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2010
2288
}
2011
2289
free(fullname);
2012
2290
}
2013
2291
}
2014
2292
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2293
/* need to clean even if 0 because man page doesn't specify */
2017
2294
free(direntries);
2018
if (ret == -1){
2295
if (numentries == -1){
2019
2296
perror_plus("scandir");
2020
2297
}
2021
2298
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0