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- Committer: Teddy Hogeborn
- Date: 2011-10-05 17:03:36 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 509.
- Revision ID: teddy@recompile.se-20111005170336-a03qsh7qoccob0fm
* debian/control (Standards-Version): Upgraded to "3.9.2".
(DM-Upload-Allowed): New; set to "yes".
(DM-Upload-Allowed): New; set to "yes".
- files removed:
- debian/source/local-options
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
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";
134
130
const char *argp_program_bug_address = "<mandos@recompile.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{
175
170
perror(print_text);
176
171
}
177
172
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
187
173
/*
188
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
175
* bytes. "buffer_capacity" is how much is currently allocated,
190
176
* "buffer_length" is how much is already used.
191
177
*/
192
178
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
179
size_t buffer_capacity){
194
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
182
if(buffer == NULL){
202
188
}
203
189
204
190
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
207
194
int ret;
208
195
server *new_server = malloc(sizeof(server));
209
196
if(new_server == NULL){
211
198
return -1;
212
199
}
213
200
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
201
.port = port,
202
.if_index = if_index,
203
.af = af };
217
204
if(new_server->ip == NULL){
218
205
perror_plus("strdup");
219
206
return -1;
241
228
/*
242
229
* Initialize GPGME.
243
230
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
246
233
gpgme_error_t rc;
247
234
gpgme_engine_info_t engine_info;
248
235
263
250
264
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
252
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
268
255
return false;
269
256
}
270
257
271
258
rc = gpgme_op_import(mc.ctx, pgp_data);
272
259
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
275
262
return false;
276
263
}
277
264
284
271
}
285
272
286
273
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
288
275
}
289
276
290
277
/* Init GPGME */
291
278
gpgme_check_version(NULL);
292
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
280
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
296
283
return false;
297
284
}
298
285
299
286
/* Set GPGME home directory for the OpenPGP engine only */
300
287
rc = gpgme_get_engine_info(&engine_info);
301
288
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
304
291
return false;
305
292
}
306
293
while(engine_info != NULL){
312
299
engine_info = engine_info->next;
313
300
}
314
301
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
303
return false;
318
304
}
319
305
320
306
/* Create new GPGME "context" */
321
307
rc = gpgme_new(&(mc.ctx));
322
308
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
326
311
return false;
327
312
}
328
313
347
332
ssize_t plaintext_length = 0;
348
333
349
334
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
336
}
352
337
353
338
/* Create new GPGME data buffer from memory cryptotext */
354
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
340
0);
356
341
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
359
344
return -1;
360
345
}
361
346
362
347
/* Create new empty GPGME data buffer for the plaintext */
363
348
rc = gpgme_data_new(&dh_plain);
364
349
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
368
352
gpgme_data_release(dh_crypto);
369
353
return -1;
370
354
}
373
357
data buffer */
374
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
359
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
378
362
plaintext_length = -1;
379
363
if(debug){
380
364
gpgme_decrypt_result_t result;
381
365
result = gpgme_op_decrypt_result(mc.ctx);
382
366
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
368
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
389
373
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
391
375
}
392
376
gpgme_recipient_t recipient;
393
377
recipient = result->recipients;
394
378
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
402
385
recipient = recipient->next;
403
386
}
404
387
}
407
390
}
408
391
409
392
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
394
}
412
395
413
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
403
*plaintext = NULL;
421
404
while(true){
422
405
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
406
(size_t)plaintext_length,
407
plaintext_capacity);
425
408
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
429
412
}
430
413
431
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
444
427
}
445
428
446
429
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
430
fprintf(stderr, "Decrypted password is: ");
448
431
for(ssize_t i = 0; i < plaintext_length; i++){
449
432
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
433
}
472
455
/* GnuTLS log function callback */
473
456
static void debuggnutls(__attribute__((unused)) int level,
474
457
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
458
fprintf(stderr, "GnuTLS: %s", string);
476
459
}
477
460
478
461
static int init_gnutls_global(const char *pubkeyfilename,
480
463
int ret;
481
464
482
465
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
fprintf(stderr, "Initializing GnuTLS\n");
484
467
}
485
468
486
469
ret = gnutls_global_init();
487
470
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
490
473
return -1;
491
474
}
492
475
501
484
/* OpenPGP credentials */
502
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
503
486
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
506
489
gnutls_global_deinit();
507
490
return -1;
508
491
}
509
492
510
493
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
515
497
}
516
498
517
499
ret = gnutls_certificate_set_openpgp_key_file
518
500
(mc.cred, pubkeyfilename, seckeyfilename,
519
501
GNUTLS_OPENPGP_FMT_BASE64);
520
502
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
526
508
goto globalfail;
527
509
}
528
510
529
511
/* GnuTLS server initialization */
530
512
ret = gnutls_dh_params_init(&mc.dh_params);
531
513
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
535
516
goto globalfail;
536
517
}
537
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
519
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
541
522
goto globalfail;
542
523
}
543
524
563
544
}
564
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
565
546
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
569
549
}
570
550
571
551
{
578
558
}
579
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
560
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
584
564
gnutls_deinit(*session);
585
565
return -1;
586
566
}
595
575
}
596
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
577
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
600
580
gnutls_deinit(*session);
601
581
return -1;
602
582
}
647
627
pf = PF_INET;
648
628
break;
649
629
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
651
631
errno = EINVAL;
652
632
return -1;
653
633
}
658
638
}
659
639
660
640
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
663
643
}
664
644
665
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
691
671
}
692
672
if(ret == 0){
693
673
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
fprintf(stderr, "Bad address: %s\n", ip);
695
675
errno = e;
696
676
goto mandos_end;
697
677
}
702
682
703
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
685
-Wunreachable-code*/
706
686
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
709
689
errno = EINVAL;
710
690
goto mandos_end;
711
691
}
729
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
710
perror_plus("if_indextoname");
731
711
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
734
714
}
735
715
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
738
718
}
739
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
730
perror_plus("inet_ntop");
751
731
} else {
752
732
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
734
}
755
735
}
756
736
}
784
764
while(true){
785
765
size_t out_size = strlen(out);
786
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
767
out_size - written));
788
768
if(ret == -1){
789
769
int e = errno;
790
770
perror_plus("write");
810
790
}
811
791
812
792
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
814
794
}
815
795
816
796
if(quit_now){
836
816
837
817
if(ret != GNUTLS_E_SUCCESS){
838
818
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
820
gnutls_perror(ret);
841
821
}
842
822
errno = EPROTO;
846
826
/* Read OpenPGP packet that contains the wanted password */
847
827
848
828
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
851
831
}
852
832
853
833
while(true){
858
838
}
859
839
860
840
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
841
buffer_capacity);
862
842
if(buffer_capacity == 0){
863
843
int e = errno;
864
844
perror_plus("incbuffer");
891
871
}
892
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
873
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
875
gnutls_perror(ret);
897
876
errno = EPROTO;
898
877
goto mandos_end;
899
878
}
900
879
break;
901
880
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
904
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
884
errno = EIO;
906
885
goto mandos_end;
911
890
}
912
891
913
892
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
893
fprintf(stderr, "Closing TLS session\n");
915
894
}
916
895
917
896
if(quit_now){
929
908
930
909
if(buffer_length > 0){
931
910
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
933
913
&decrypted_buffer);
934
914
if(decrypted_buffer_size >= 0){
935
915
946
926
if(ret == 0 and ferror(stdout)){
947
927
int e = errno;
948
928
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
951
931
}
952
932
errno = e;
953
933
goto mandos_end;
1010
990
switch(event){
1011
991
default:
1012
992
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1017
996
break;
1018
997
1019
998
case AVAHI_RESOLVER_FOUND:
1021
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1022
1001
avahi_address_snprint(ip, sizeof(ip), address);
1023
1002
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1027
1006
}
1028
1007
int ret = start_mandos_communication(ip, port, interface,
1029
1008
avahi_proto_to_af(proto));
1061
1040
default:
1062
1041
case AVAHI_BROWSER_FAILURE:
1063
1042
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1066
1045
avahi_simple_poll_quit(mc.simple_poll);
1067
1046
return;
1068
1047
1075
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
1055
name, type, domain, protocol, 0,
1077
1056
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1081
1059
break;
1082
1060
1083
1061
case AVAHI_BROWSER_REMOVE:
1086
1064
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
1065
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
1066
if(debug){
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1091
1068
}
1092
1069
break;
1093
1070
}
1108
1085
errno = old_errno;
1109
1086
}
1110
1087
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1122
1144
if(debug){
1123
perror_plus("ioctl SIOCGIFFLAGS");
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1124
1147
}
1125
return false;
1148
free(flagstring);
1149
return 0;
1126
1150
}
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1132
1153
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1134
1155
if(debug){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1137
1158
}
1138
return false;
1159
return 0;
1139
1160
}
1140
1161
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1142
1163
if(debug){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1145
1166
}
1146
return true;
1167
return 1;
1147
1168
}
1148
1169
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1150
1171
if(debug){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1153
1174
}
1154
return false;
1175
return 0;
1155
1176
}
1156
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1158
1179
if(debug){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1161
1182
}
1162
return false;
1183
return 0;
1163
1184
}
1164
1165
1185
/* Accept this device */
1166
1186
if(debug){
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1236
1189
}
1237
1190
return 1;
1238
1191
}
1248
1201
return 1;
1249
1202
}
1250
1203
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1312
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
1205
int ret;
1314
1206
struct timespec now;
1318
1210
while(true){
1319
1211
if(mc.current_server == NULL){
1320
1212
if (debug){
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1323
1215
}
1324
1216
ret = avahi_simple_poll_iterate(s, -1);
1325
1217
} else {
1326
1218
if (debug){
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1329
1221
}
1330
1222
/* the current time */
1331
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1347
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1240
1349
1241
if (debug){
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1352
1243
}
1353
1244
1354
1245
if(block_time <= 0){
1374
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
1266
}
1376
1267
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1378
1269
return (ret != 1) ? ret : 0;
1379
1270
}
1380
1271
}
1381
1272
}
1382
1273
}
1383
1274
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1469
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1509
}
1510
1511
1275
int main(int argc, char *argv[]){
1512
1276
AvahiSServiceBrowser *sb = NULL;
1513
1277
int error;
1595
1359
.arg = "SECONDS",
1596
1360
.doc = "Retry interval used when denied by the mandos server",
1597
1361
.group = 2 },
1598
{ .name = "network-hook-dir", .key = 133,
1599
.arg = "DIR",
1600
.doc = "Directory where network hooks are located",
1601
.group = 2 },
1602
1362
/*
1603
1363
* These reproduce what we would get without ARGP_NO_HELP
1604
1364
*/
1657
1417
argp_error(state, "Bad retry interval");
1658
1418
}
1659
1419
break;
1660
case 133: /* --network-hook-dir */
1661
hookdir = arg;
1662
break;
1663
1420
/*
1664
1421
* These reproduce what we would get without ARGP_NO_HELP
1665
1422
*/
1671
1428
argp_state_help(state, state->out_stream,
1672
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
1430
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1677
1432
exit(argp_err_exit_status);
1678
1433
break;
1679
1434
default:
1706
1461
{
1707
1462
/* Work around Debian bug #633582:
1708
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1709
1465
1710
1466
/* Re-raise priviliges */
1711
1467
errno = 0;
1712
1468
ret = seteuid(0);
1713
1469
if(ret == -1){
1714
1470
perror_plus("seteuid");
1715
} else {
1716
struct stat st;
1717
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1722
} else {
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1724
if(ret == -1){
1725
perror_plus("fstat");
1726
} else {
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1730
if(ret == -1){
1731
perror_plus("fchown");
1732
}
1733
}
1734
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1736
}
1737
}
1738
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1743
} else {
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1745
if(ret == -1){
1746
perror_plus("fstat");
1747
} else {
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
1765
}
1766
}
1767
}
1768
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1772
1519
}
1773
1520
1774
1521
if(not debug){
1775
1522
avahi_set_log_function(empty_log);
1776
1523
}
1777
1524
1778
1525
if(interface[0] == '\0'){
1779
1526
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1782
1528
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
1529
if(ret >= 1){
1790
/* Pick the first interface returned */
1530
/* Pick the first good interface */
1791
1531
interface = strdup(direntries[0]->d_name);
1792
1532
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1794
1534
}
1795
1535
if(interface == NULL){
1796
1536
perror_plus("malloc");
1801
1541
free(direntries);
1802
1542
} else {
1803
1543
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1544
fprintf(stderr, "Could not find a network interface\n");
1805
1545
exitcode = EXIT_FAILURE;
1806
1546
goto end;
1807
1547
}
1813
1553
srand((unsigned int) time(NULL));
1814
1554
mc.simple_poll = avahi_simple_poll_new();
1815
1555
if(mc.simple_poll == NULL){
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1818
1557
exitcode = EX_UNAVAILABLE;
1819
1558
goto end;
1820
1559
}
1886
1625
if(strcmp(interface, "none") != 0){
1887
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
1627
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1890
1629
exitcode = EX_UNAVAILABLE;
1891
1630
goto end;
1892
1631
}
2012
1751
#endif /* __linux__ */
2013
1752
/* Lower privileges */
2014
1753
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
2019
1766
}
2020
1767
}
2021
1768
2025
1772
2026
1773
ret = init_gnutls_global(pubkey, seckey);
2027
1774
if(ret == -1){
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2029
1776
exitcode = EX_UNAVAILABLE;
2030
1777
goto end;
2031
1778
} else {
2047
1794
}
2048
1795
2049
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
2050
fprintf_plus(stderr, "init_gpgme failed\n");
1797
fprintf(stderr, "init_gpgme failed\n");
2051
1798
exitcode = EX_UNAVAILABLE;
2052
1799
goto end;
2053
1800
} else {
2063
1810
/* (Mainly meant for debugging) */
2064
1811
char *address = strrchr(connect_to, ':');
2065
1812
if(address == NULL){
2066
fprintf_plus(stderr, "No colon in address\n");
1813
fprintf(stderr, "No colon in address\n");
2067
1814
exitcode = EX_USAGE;
2068
1815
goto end;
2069
1816
}
2077
1824
tmpmax = strtoimax(address+1, &tmp, 10);
2078
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
1826
or tmpmax != (uint16_t)tmpmax){
2080
fprintf_plus(stderr, "Bad port number\n");
1827
fprintf(stderr, "Bad port number\n");
2081
1828
exitcode = EX_USAGE;
2082
1829
goto end;
2083
1830
}
2113
1860
break;
2114
1861
}
2115
1862
if(debug){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2118
1865
}
2119
1866
sleep((int)retry_interval);
2120
1867
}
2122
1869
if (not quit_now){
2123
1870
exitcode = EXIT_SUCCESS;
2124
1871
}
2125
1872
2126
1873
goto end;
2127
1874
}
2128
1875
2150
1897
2151
1898
/* Check if creating the Avahi server object succeeded */
2152
1899
if(mc.server == NULL){
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2155
1902
exitcode = EX_UNAVAILABLE;
2156
1903
goto end;
2157
1904
}
2165
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
1913
NULL, 0, browse_callback, NULL);
2167
1914
if(sb == NULL){
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2170
1917
exitcode = EX_UNAVAILABLE;
2171
1918
goto end;
2172
1919
}
2178
1925
/* Run the main loop */
2179
1926
2180
1927
if(debug){
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
1928
fprintf(stderr, "Starting Avahi loop search\n");
2182
1929
}
2183
1930
2184
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
1932
(int)(retry_interval * 1000));
2186
1933
if(debug){
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2189
1936
}
2190
1937
2191
1938
end:
2192
1939
2193
1940
if(debug){
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2195
1942
}
2196
1943
2197
1944
/* Cleanup things */
2213
1960
if(gpgme_initialized){
2214
1961
gpgme_release(mc.ctx);
2215
1962
}
2216
1963
2217
1964
/* Cleans up the circular linked list of Mandos servers the client
2218
1965
has seen */
2219
1966
if(mc.current_server != NULL){
2225
1972
}
2226
1973
}
2227
1974
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2232
{
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
2233
1978
errno = 0;
2234
1979
ret = seteuid(0);
2235
1980
if(ret == -1){
2236
1981
perror_plus("seteuid");
2237
1982
}
2238
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
1983
if(geteuid() == 0){
2241
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
1985
if(ret == -1){
2243
1986
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
1987
} else if(network.ifr_flags & IFF_UP) {
2245
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
1990
if(ret == -1){
2252
1995
if(ret == -1){
2253
1996
perror_plus("close");
2254
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2255
2004
}
2256
2005
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2263
2006
2264
2007
/* Removes the GPGME temp directory and all files inside */
2265
2008
if(tempdir_created){
2279
2022
}
2280
2023
ret = remove(fullname);
2281
2024
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2284
2027
}
2285
2028
free(fullname);
2286
2029
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0