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- Committer: Teddy Hogeborn
- Date: 2011-07-25 18:52:11 UTC
- mfrom: (237.7.37 trunk)
- Revision ID: teddy@fukt.bsnet.se-20110725185211-wlitr9jvs70e1xh8
Merge from trunk.
- files removed:
- 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@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
76
setgid(), pause() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
88
92
89
#ifdef __linux__
93
90
#include <sys/klog.h> /* klogctl() */
111
108
init_gnutls_session(),
112
109
GNUTLS_* */
113
110
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
116
113
117
114
/* GPGME */
118
115
#include <gpgme.h> /* All GPGME types, constants and
126
123
#define PATHDIR "/conf/conf.d/mandos"
127
124
#define SECKEY "seckey.txt"
128
125
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
126
131
127
bool debug = false;
132
128
static const char mandos_protocol_version[] = "1";
133
129
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
131
static const char sys_class_net[] = "/sys/class/net";
136
132
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
133
139
134
/* Doubly linked list that need to be circularly linked when used */
140
135
typedef struct server{
170
165
171
166
/* Function to use when printing errors */
172
167
void perror_plus(const char *print_text){
173
int e = errno;
174
168
fprintf(stderr, "Mandos plugin %s: ",
175
169
program_invocation_short_name);
176
errno = e;
177
170
perror(print_text);
178
171
}
179
172
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
173
/*
191
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
175
* bytes. "buffer_capacity" is how much is currently allocated,
193
176
* "buffer_length" is how much is already used.
194
177
*/
195
178
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
179
size_t buffer_capacity){
197
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
182
if(buffer == NULL){
204
187
return buffer_capacity;
205
188
}
206
189
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){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
210
193
int ret;
211
194
server *new_server = malloc(sizeof(server));
212
195
if(new_server == NULL){
213
196
perror_plus("malloc");
214
return false;
197
return -1;
215
198
}
216
199
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
220
203
if(new_server->ip == NULL){
221
204
perror_plus("strdup");
222
return false;
205
return -1;
223
206
}
224
/* Special case of first server */
207
/* unique case of first server */
225
208
if (mc.current_server == NULL){
226
209
new_server->next = new_server;
227
210
new_server->prev = new_server;
228
211
mc.current_server = new_server;
229
/* Place the new server last in the list */
212
/* Placing the new server last in the list */
230
213
} else {
231
214
new_server->next = mc.current_server;
232
215
new_server->prev = mc.current_server->prev;
236
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
220
if(ret == -1){
238
221
perror_plus("clock_gettime");
239
return false;
222
return -1;
240
223
}
241
return true;
224
return 0;
242
225
}
243
226
244
227
/*
245
228
* Initialize GPGME.
246
229
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
249
232
gpgme_error_t rc;
250
233
gpgme_engine_info_t engine_info;
251
234
266
249
267
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
251
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
271
254
return false;
272
255
}
273
256
274
257
rc = gpgme_op_import(mc.ctx, pgp_data);
275
258
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
278
261
return false;
279
262
}
280
263
287
270
}
288
271
289
272
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
291
274
}
292
275
293
276
/* Init GPGME */
294
277
gpgme_check_version(NULL);
295
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
279
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
299
282
return false;
300
283
}
301
284
302
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
303
286
rc = gpgme_get_engine_info(&engine_info);
304
287
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
307
290
return false;
308
291
}
309
292
while(engine_info != NULL){
315
298
engine_info = engine_info->next;
316
299
}
317
300
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
302
return false;
321
303
}
322
304
323
305
/* Create new GPGME "context" */
324
306
rc = gpgme_new(&(mc.ctx));
325
307
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
329
310
return false;
330
311
}
331
312
350
331
ssize_t plaintext_length = 0;
351
332
352
333
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
335
}
355
336
356
337
/* Create new GPGME data buffer from memory cryptotext */
357
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
339
0);
359
340
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
362
343
return -1;
363
344
}
364
345
365
346
/* Create new empty GPGME data buffer for the plaintext */
366
347
rc = gpgme_data_new(&dh_plain);
367
348
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
371
351
gpgme_data_release(dh_crypto);
372
352
return -1;
373
353
}
376
356
data buffer */
377
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
358
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
381
361
plaintext_length = -1;
382
362
if(debug){
383
363
gpgme_decrypt_result_t result;
384
364
result = gpgme_op_decrypt_result(mc.ctx);
385
365
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
367
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
392
372
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
394
374
}
395
375
gpgme_recipient_t recipient;
396
376
recipient = result->recipients;
397
377
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
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");
405
384
recipient = recipient->next;
406
385
}
407
386
}
410
389
}
411
390
412
391
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
393
}
415
394
416
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
423
402
*plaintext = NULL;
424
403
while(true){
425
404
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
428
407
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
432
411
}
433
412
434
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
447
426
}
448
427
449
428
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
451
430
for(ssize_t i = 0; i < plaintext_length; i++){
452
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
432
}
475
454
/* GnuTLS log function callback */
476
455
static void debuggnutls(__attribute__((unused)) int level,
477
456
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
479
458
}
480
459
481
460
static int init_gnutls_global(const char *pubkeyfilename,
483
462
int ret;
484
463
485
464
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
487
466
}
488
467
489
468
ret = gnutls_global_init();
490
469
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
493
472
return -1;
494
473
}
495
474
504
483
/* OpenPGP credentials */
505
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
485
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
509
488
gnutls_global_deinit();
510
489
return -1;
511
490
}
512
491
513
492
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
518
496
}
519
497
520
498
ret = gnutls_certificate_set_openpgp_key_file
521
499
(mc.cred, pubkeyfilename, seckeyfilename,
522
500
GNUTLS_OPENPGP_FMT_BASE64);
523
501
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
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));
529
507
goto globalfail;
530
508
}
531
509
532
510
/* GnuTLS server initialization */
533
511
ret = gnutls_dh_params_init(&mc.dh_params);
534
512
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
538
515
goto globalfail;
539
516
}
540
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
518
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
544
521
goto globalfail;
545
522
}
546
523
566
543
}
567
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
545
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
572
548
}
573
549
574
550
{
581
557
}
582
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
559
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
587
563
gnutls_deinit(*session);
588
564
return -1;
589
565
}
598
574
}
599
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
576
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
603
579
gnutls_deinit(*session);
604
580
return -1;
605
581
}
650
626
pf = PF_INET;
651
627
break;
652
628
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
654
630
errno = EINVAL;
655
631
return -1;
656
632
}
661
637
}
662
638
663
639
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
666
642
}
667
643
668
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
694
670
}
695
671
if(ret == 0){
696
672
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
698
674
errno = e;
699
675
goto mandos_end;
700
676
}
705
681
706
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
684
-Wunreachable-code*/
709
685
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
712
688
errno = EINVAL;
713
689
goto mandos_end;
714
690
}
732
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
709
perror_plus("if_indextoname");
734
710
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
737
713
}
738
714
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
741
717
}
742
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
753
729
perror_plus("inet_ntop");
754
730
} else {
755
731
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
733
}
758
734
}
759
735
}
787
763
while(true){
788
764
size_t out_size = strlen(out);
789
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
766
out_size - written));
791
767
if(ret == -1){
792
768
int e = errno;
793
769
perror_plus("write");
813
789
}
814
790
815
791
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
793
}
818
794
819
795
if(quit_now){
839
815
840
816
if(ret != GNUTLS_E_SUCCESS){
841
817
if(debug){
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
843
819
gnutls_perror(ret);
844
820
}
845
821
errno = EPROTO;
849
825
/* Read OpenPGP packet that contains the wanted password */
850
826
851
827
if(debug){
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
854
830
}
855
831
856
832
while(true){
861
837
}
862
838
863
839
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
840
buffer_capacity);
865
841
if(buffer_capacity == 0){
866
842
int e = errno;
867
843
perror_plus("incbuffer");
894
870
}
895
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
872
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
874
gnutls_perror(ret);
900
875
errno = EPROTO;
901
876
goto mandos_end;
902
877
}
903
878
break;
904
879
default:
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
907
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
883
errno = EIO;
909
884
goto mandos_end;
914
889
}
915
890
916
891
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
918
893
}
919
894
920
895
if(quit_now){
932
907
933
908
if(buffer_length > 0){
934
909
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
936
912
&decrypted_buffer);
937
913
if(decrypted_buffer_size >= 0){
938
914
949
925
if(ret == 0 and ferror(stdout)){
950
926
int e = errno;
951
927
if(debug){
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
954
930
}
955
931
errno = e;
956
932
goto mandos_end;
1013
989
switch(event){
1014
990
default:
1015
991
case AVAHI_RESOLVER_FAILURE:
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
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)));
1020
995
break;
1021
996
1022
997
case AVAHI_RESOLVER_FOUND:
1024
999
char ip[AVAHI_ADDRESS_STR_MAX];
1025
1000
avahi_address_snprint(ip, sizeof(ip), address);
1026
1001
if(debug){
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
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);
1030
1005
}
1031
1006
int ret = start_mandos_communication(ip, port, interface,
1032
1007
avahi_proto_to_af(proto));
1033
1008
if(ret == 0){
1034
1009
avahi_simple_poll_quit(mc.simple_poll);
1035
1010
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1041
1013
}
1042
1014
}
1043
1015
}
1067
1039
default:
1068
1040
case AVAHI_BROWSER_FAILURE:
1069
1041
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1072
1044
avahi_simple_poll_quit(mc.simple_poll);
1073
1045
return;
1074
1046
1081
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
1054
name, type, domain, protocol, 0,
1083
1055
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
1058
break;
1088
1059
1089
1060
case AVAHI_BROWSER_REMOVE:
1092
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
1065
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1097
1067
}
1098
1068
break;
1099
1069
}
1114
1084
errno = old_errno;
1115
1085
}
1116
1086
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){
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){
1128
1143
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1130
1146
}
1131
return false;
1147
free(flagstring);
1148
return 0;
1132
1149
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1138
1152
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1140
1154
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1143
1157
}
1144
return false;
1158
return 0;
1145
1159
}
1146
1160
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1148
1162
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1151
1165
}
1152
return true;
1166
return 1;
1153
1167
}
1154
1168
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1156
1170
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1159
1173
}
1160
return false;
1174
return 0;
1161
1175
}
1162
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1164
1178
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1167
1181
}
1168
return false;
1182
return 0;
1169
1183
}
1170
1171
1184
/* Accept this device */
1172
1185
if(debug){
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;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1242
1188
}
1243
1189
return 1;
1244
1190
}
1254
1200
return 1;
1255
1201
}
1256
1202
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
1318
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
1204
int ret;
1320
1205
struct timespec now;
1321
1206
struct timespec waited_time;
1322
1207
intmax_t block_time;
1323
1208
1324
1209
while(true){
1325
1210
if(mc.current_server == NULL){
1326
1211
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1329
1214
}
1330
1215
ret = avahi_simple_poll_iterate(s, -1);
1331
1216
} else {
1332
1217
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1335
1220
}
1336
1221
/* the current time */
1337
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1351
1236
block_time = ((retry_interval
1352
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1239
1355
1240
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1358
1242
}
1359
1243
1360
1244
if(block_time <= 0){
1361
1245
ret = start_mandos_communication(mc.current_server->ip,
1362
1246
mc.current_server->port,
1380
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1265
}
1382
1266
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1384
1268
return (ret != 1) ? ret : 0;
1385
1269
}
1386
1270
}
1387
1271
}
1388
1272
}
1389
1273
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);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
1526
1274
int main(int argc, char *argv[]){
1527
1275
AvahiSServiceBrowser *sb = NULL;
1528
1276
int error;
1608
1356
.group = 2 },
1609
1357
{ .name = "retry", .key = 132,
1610
1358
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
1616
1360
.group = 2 },
1617
1361
/*
1618
1362
* These reproduce what we would get without ARGP_NO_HELP
1667
1411
errno = 0;
1668
1412
retry_interval = strtod(arg, &tmp);
1669
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
1672
1415
argp_error(state, "Bad retry interval");
1673
1416
}
1674
1417
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1678
1418
/*
1679
1419
* These reproduce what we would get without ARGP_NO_HELP
1680
1420
*/
1686
1426
argp_state_help(state, state->out_stream,
1687
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
1428
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1690
1430
exit(argp_err_exit_status);
1691
1431
break;
1692
1432
default:
1719
1459
{
1720
1460
/* Work around Debian bug #633582:
1721
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1722
1463
1723
1464
/* Re-raise priviliges */
1724
1465
errno = 0;
1725
1466
ret = seteuid(0);
1726
1467
if(ret == -1){
1727
1468
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
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
}
1785
1513
}
1786
1514
1787
1515
if(not debug){
1788
1516
avahi_set_log_function(empty_log);
1789
1517
}
1790
1518
1791
1519
if(interface[0] == '\0'){
1792
1520
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1795
1522
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
1523
if(ret >= 1){
1803
/* Pick the first interface returned */
1524
/* Pick the first good interface */
1804
1525
interface = strdup(direntries[0]->d_name);
1805
1526
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1807
1528
}
1808
1529
if(interface == NULL){
1809
1530
perror_plus("malloc");
1814
1535
free(direntries);
1815
1536
} else {
1816
1537
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1538
fprintf(stderr, "Could not find a network interface\n");
1818
1539
exitcode = EXIT_FAILURE;
1819
1540
goto end;
1820
1541
}
1826
1547
srand((unsigned int) time(NULL));
1827
1548
mc.simple_poll = avahi_simple_poll_new();
1828
1549
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1831
1551
exitcode = EX_UNAVAILABLE;
1832
1552
goto end;
1833
1553
}
1899
1619
if(strcmp(interface, "none") != 0){
1900
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
1621
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1903
1623
exitcode = EX_UNAVAILABLE;
1904
1624
goto end;
1905
1625
}
2025
1745
#endif /* __linux__ */
2026
1746
/* Lower privileges */
2027
1747
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
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
}
2032
1760
}
2033
1761
}
2034
1762
2038
1766
2039
1767
ret = init_gnutls_global(pubkey, seckey);
2040
1768
if(ret == -1){
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2042
1770
exitcode = EX_UNAVAILABLE;
2043
1771
goto end;
2044
1772
} else {
2060
1788
}
2061
1789
2062
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1791
fprintf(stderr, "init_gpgme failed\n");
2064
1792
exitcode = EX_UNAVAILABLE;
2065
1793
goto end;
2066
1794
} else {
2076
1804
/* (Mainly meant for debugging) */
2077
1805
char *address = strrchr(connect_to, ':');
2078
1806
if(address == NULL){
2079
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2080
1808
exitcode = EX_USAGE;
2081
1809
goto end;
2082
1810
}
2090
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2091
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
1820
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
1821
fprintf(stderr, "Bad port number\n");
2094
1822
exitcode = EX_USAGE;
2095
1823
goto end;
2096
1824
}
2101
1829
2102
1830
port = (uint16_t)tmpmax;
2103
1831
*address = '\0';
1832
address = connect_to;
2104
1833
/* Colon in address indicates IPv6 */
2105
1834
int af;
2106
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2107
1836
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
}
2114
1837
} else {
2115
1838
af = AF_INET;
2116
1839
}
2117
address = connect_to;
2118
1840
2119
1841
if(quit_now){
2120
1842
goto end;
2121
1843
}
2122
1844
2123
1845
while(not quit_now){
2124
1846
ret = start_mandos_communication(address, port, if_index, af);
2125
1847
if(quit_now or ret == 0){
2126
1848
break;
2127
1849
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
1850
sleep((int)retry_interval or 1);
1851
};
1852
2135
1853
if (not quit_now){
2136
1854
exitcode = EXIT_SUCCESS;
2137
1855
}
2138
1856
2139
1857
goto end;
2140
1858
}
2141
1859
2163
1881
2164
1882
/* Check if creating the Avahi server object succeeded */
2165
1883
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2168
1886
exitcode = EX_UNAVAILABLE;
2169
1887
goto end;
2170
1888
}
2178
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
1897
NULL, 0, browse_callback, NULL);
2180
1898
if(sb == NULL){
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2183
1901
exitcode = EX_UNAVAILABLE;
2184
1902
goto end;
2185
1903
}
2191
1909
/* Run the main loop */
2192
1910
2193
1911
if(debug){
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2195
1913
}
2196
1914
2197
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
1916
(int)(retry_interval * 1000));
2199
1917
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2202
1920
}
2203
1921
2204
1922
end:
2205
1923
2206
1924
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2208
1926
}
2209
1927
2210
1928
/* Cleanup things */
2226
1944
if(gpgme_initialized){
2227
1945
gpgme_release(mc.ctx);
2228
1946
}
2229
1947
2230
1948
/* Cleans up the circular linked list of Mandos servers the client
2231
1949
has seen */
2232
1950
if(mc.current_server != NULL){
2238
1956
}
2239
1957
}
2240
1958
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
2246
1962
errno = 0;
2247
1963
ret = seteuid(0);
2248
1964
if(ret == -1){
2249
1965
perror_plus("seteuid");
2250
1966
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1967
if(geteuid() == 0){
2254
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
1969
if(ret == -1){
2256
1970
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
1971
} else if(network.ifr_flags & IFF_UP) {
2258
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
1974
if(ret == -1){
2265
1979
if(ret == -1){
2266
1980
perror_plus("close");
2267
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
2268
1988
}
2269
1989
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
1990
2277
1991
/* Removes the GPGME temp directory and all files inside */
2278
1992
if(tempdir_created){
2279
1993
struct dirent **direntries = NULL;
2280
1994
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2285
1998
direntry = direntries[i];
2286
1999
char *fullname = NULL;
2287
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2292
2005
}
2293
2006
ret = remove(fullname);
2294
2007
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2297
2010
}
2298
2011
free(fullname);
2299
2012
}
2300
2013
}
2301
2014
2302
/* need to clean even if 0 because man page doesn't specify */
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2303
2017
free(direntries);
2304
if (numentries == -1){
2018
if (ret == -1){
2305
2019
perror_plus("scandir");
2306
2020
}
2307
2021
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0