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- Committer: Teddy Hogeborn
- Date: 2014-07-12 12:54:13 UTC
- Revision ID: teddy@recompile.se-20140712125413-2v66uak9da6kwjs5
mandos: The Debian package should prefer "ssh-client" over "fping".
* debian/control (mandos/Recommends): List "ssh-client" before
"fping".
* debian/control (mandos/Recommends): List "ssh-client" before
"fping".
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
240
234
.af = af };
241
235
if(new_server->ip == NULL){
242
236
perror_plus("strdup");
243
free(new_server);
244
237
return false;
245
238
}
246
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
240
if(ret == -1){
248
241
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
242
return false;
259
243
}
260
244
/* Special case of first server */
272
256
return true;
273
257
}
274
258
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
279
int ret = 0;
280
if(seteuid(0) == -1){
281
ret = errno;
282
}
283
errno = old_errno;
284
return ret;
285
}
286
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
292
if(ret != 0){
293
errno = old_errno;
294
return ret;
295
}
296
if(setuid(0) == -1){
297
ret = errno;
298
}
299
errno = old_errno;
300
return ret;
301
}
302
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
307
int ret = 0;
308
if(seteuid(uid) == -1){
309
ret = errno;
310
}
311
errno = old_errno;
312
return ret;
313
}
314
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
319
int ret = 0;
320
if(setuid(uid) == -1){
321
ret = errno;
322
}
323
errno = old_errno;
324
return ret;
325
}
326
327
259
/*
328
260
* Initialize GPGME.
329
261
*/
349
281
return false;
350
282
}
351
283
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
354
do {
355
{
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
358
struct tm tm;
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
361
break;
362
}
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
364
break;
365
}
366
if(debug){
367
fprintf_plus(stderr, "System clock is January 1970");
368
}
369
} else {
370
if(debug){
371
fprintf_plus(stderr, "System clock is invalid");
372
}
373
}
374
}
375
struct stat keystat;
376
ret = fstat(fd, &keystat);
377
if(ret != 0){
378
perror_plus("fstat");
379
break;
380
}
381
ret = raise_privileges();
382
if(ret != 0){
383
errno = ret;
384
perror_plus("Failed to raise privileges");
385
break;
386
}
387
if(debug){
388
fprintf_plus(stderr,
389
"Setting system clock to key file mtime");
390
}
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
394
}
395
ret = lower_privileges();
396
if(ret != 0){
397
errno = ret;
398
perror_plus("Failed to lower privileges");
399
}
400
} while(false);
401
402
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
403
285
if(rc != GPG_ERR_NO_ERROR){
404
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
294
gpgme_strsource(rc), gpgme_strerror(rc));
413
295
return false;
414
296
}
415
{
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
422
fprintf_plus(stderr,
423
"The total number of considered keys: %d\n",
424
import_result->considered);
425
fprintf_plus(stderr,
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
428
fprintf_plus(stderr,
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
443
fprintf_plus(stderr,
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
446
fprintf_plus(stderr,
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
449
fprintf_plus(stderr,
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
459
import_status->fpr);
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
464
}
465
fprintf_plus(stderr, "Key status:\n");
466
fprintf_plus(stderr,
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
470
fprintf_plus(stderr,
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
486
}
487
return false;
488
}
489
}
490
297
491
ret = close(fd);
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
492
299
if(ret == -1){
493
300
perror_plus("close");
494
301
}
533
340
/* Create new GPGME "context" */
534
341
rc = gpgme_new(&(mc->ctx));
535
342
if(rc != GPG_ERR_NO_ERROR){
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
538
346
return false;
539
347
}
540
348
576
384
/* Create new empty GPGME data buffer for the plaintext */
577
385
rc = gpgme_data_new(&dh_plain);
578
386
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
580
389
gpgme_strsource(rc), gpgme_strerror(rc));
581
390
gpgme_data_release(dh_crypto);
582
391
return -1;
595
404
if(result == NULL){
596
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
597
406
} else {
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
601
}
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
604
411
if(result->file_name != NULL){
605
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
606
413
}
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
414
gpgme_recipient_t recipient;
415
recipient = result->recipients;
416
while(recipient != NULL){
610
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
613
421
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
615
425
}
616
426
}
617
427
}
673
483
return plaintext_length;
674
484
}
675
485
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
678
if(str == NULL)
679
return "(unknown)";
680
return str;
681
}
682
683
486
__attribute__((warn_unused_result))
684
487
static const char *safer_gnutls_strerror(int value){
685
488
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
687
492
}
688
493
689
494
/* GnuTLS log function callback */
693
498
fprintf_plus(stderr, "GnuTLS: %s", string);
694
499
}
695
500
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
501
__attribute__((nonnull, warn_unused_result))
697
502
static int init_gnutls_global(const char *pubkeyfilename,
698
503
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
504
mandos_context *mc){
701
505
int ret;
702
unsigned int uret;
703
506
704
507
if(debug){
705
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
706
509
}
707
510
511
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
515
return -1;
516
}
517
708
518
if(debug){
709
519
/* "Use a log level over 10 to enable all debugging options."
710
520
* - GnuTLS manual
718
528
if(ret != GNUTLS_E_SUCCESS){
719
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
721
532
return -1;
722
533
}
723
534
748
559
safer_gnutls_strerror(ret));
749
560
goto globalfail;
750
561
}
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
754
do {
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
756
if(dhpfile == -1){
757
perror_plus("open");
758
dhparamsfilename = NULL;
759
break;
760
}
761
size_t params_capacity = 0;
762
while(true){
763
params_capacity = incbuffer((char **)¶ms.data,
764
(size_t)params.size,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
768
free(params.data);
769
params.data = NULL;
770
dhparamsfilename = NULL;
771
break;
772
}
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
775
BUFFER_SIZE);
776
/* EOF */
777
if(bytes_read == 0){
778
break;
779
}
780
/* check bytes_read for failure */
781
if(bytes_read < 0){
782
perror_plus("read");
783
free(params.data);
784
params.data = NULL;
785
dhparamsfilename = NULL;
786
break;
787
}
788
params.size += (unsigned int)bytes_read;
789
}
790
ret = close(dhpfile);
791
if(ret == -1){
792
perror_plus("close");
793
}
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
796
}
797
if(dhparamsfilename == NULL){
798
break;
799
}
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
807
}
808
free(params.data);
809
} while(false);
810
}
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
816
do {
817
int secfile = open(seckeyfilename, O_RDONLY);
818
if(secfile == -1){
819
perror_plus("open");
820
break;
821
}
822
size_t buffer_capacity = 0;
823
while(true){
824
buffer_capacity = incbuffer((char **)&buffer.data,
825
(size_t)buffer.size,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
829
free(buffer.data);
830
buffer.data = NULL;
831
break;
832
}
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
835
BUFFER_SIZE);
836
/* EOF */
837
if(bytes_read == 0){
838
break;
839
}
840
/* check bytes_read for failure */
841
if(bytes_read < 0){
842
perror_plus("read");
843
free(buffer.data);
844
buffer.data = NULL;
845
break;
846
}
847
buffer.size += (unsigned int)bytes_read;
848
}
849
close(secfile);
850
} while(false);
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
854
{
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
859
" structure: %s",
860
safer_gnutls_strerror(ret));
861
free(buffer.data);
862
buffer.data = NULL;
863
} else {
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
869
privkey = NULL;
870
}
871
free(buffer.data);
872
buffer.data = NULL;
873
if(privkey != NULL){
874
/* Use private key to suggest an appropriate
875
sec_param */
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
878
if(debug){
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
882
(sec_param)));
883
}
884
}
885
}
886
}
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
890
if(debug){
891
fprintf_plus(stderr, "Falling back to security parameter"
892
" \"%s\"\n",
893
safe_string(gnutls_sec_param_get_name
894
(sec_param)));
895
}
896
}
897
}
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
if(uret != 0){
900
mc->dh_bits = uret;
901
if(debug){
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)),
906
mc->dh_bits);
907
}
908
} else {
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
912
(sec_param)),
913
safer_gnutls_strerror(ret));
914
goto globalfail;
915
}
916
} else if(debug){
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
mc->dh_bits);
919
}
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
925
goto globalfail;
926
}
927
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
566
goto globalfail;
567
}
568
928
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
929
570
930
571
return 0;
932
573
globalfail:
933
574
934
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
935
577
gnutls_dh_params_deinit(mc->dh_params);
936
578
return -1;
937
579
}
989
631
/* ignore client certificate if any. */
990
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
991
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
992
636
return 0;
993
637
}
994
638
996
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
997
641
__attribute__((unused)) const char *txt){}
998
642
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1004
int ret;
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1011
if(debug){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1014
}
1015
return false;
1016
}
1017
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1021
return false;
1022
}
1023
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1025
if(devnull == -1){
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1027
return false;
1028
}
1029
pid_t pid = fork();
1030
if(pid == 0){
1031
/* Child */
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1034
if(errno != 0){
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1037
} else {
1038
/* Set group */
1039
errno = 0;
1040
ret = setgid(0);
1041
if(ret == -1){
1042
perror_plus("setgid");
1043
_exit(EX_NOPERM);
1044
}
1045
/* Reset supplementary groups */
1046
errno = 0;
1047
ret = setgroups(0, NULL);
1048
if(ret == -1){
1049
perror_plus("setgroups");
1050
_exit(EX_NOPERM);
1051
}
1052
}
1053
ret = dup2(devnull, STDIN_FILENO);
1054
if(ret == -1){
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1056
_exit(EX_OSERR);
1057
}
1058
ret = close(devnull);
1059
if(ret == -1){
1060
perror_plus("close");
1061
_exit(EX_OSERR);
1062
}
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
if(ret == -1){
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1066
_exit(EX_OSERR);
1067
}
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1069
O_RDONLY
1070
| O_DIRECTORY
1071
| O_PATH
1072
| O_CLOEXEC));
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1076
}
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1078
helper, O_RDONLY));
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1083
}
1084
close(helperdir_fd);
1085
#ifdef __GNUC__
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1088
#endif
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1092
environ) == -1){
1093
#ifdef __GNUC__
1094
#pragma GCC diagnostic pop
1095
#endif
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1098
}
1099
}
1100
if(pid == -1){
1101
perror_plus("fork");
1102
return false;
1103
}
1104
int status;
1105
pid_t pret = -1;
1106
errno = 0;
1107
do {
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1115
}
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1118
}
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1121
" helper program");
1122
}
1123
return false;
1124
}
1125
} while(pret == -1 and errno == EINTR);
1126
if(pret == -1){
1127
perror_plus("waitpid");
1128
return false;
1129
}
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1134
return false;
1135
}
1136
return true;
1137
}
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1141
return false;
1142
}
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1144
return false;
1145
}
1146
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1150
if(debug){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1152
}
1153
return add_delete_local_route(true, address, if_index);
1154
}
1155
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1159
if(debug){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1161
}
1162
return add_delete_local_route(false, address, if_index);
1163
}
1164
1165
643
/* Called when a Mandos server is found */
1166
644
__attribute__((nonnull, warn_unused_result))
1167
645
static int start_mandos_communication(const char *ip, in_port_t port,
1178
656
int retval = -1;
1179
657
gnutls_session_t session;
1180
658
int pf; /* Protocol family */
1181
bool route_added = false;
1182
659
1183
660
errno = 0;
1184
661
1206
683
bool match = false;
1207
684
{
1208
685
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1212
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
689
match = true;
1214
690
break;
1243
719
PRIuMAX "\n", ip, (uintmax_t)port);
1244
720
}
1245
721
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1247
723
if(tcp_sd < 0){
1248
724
int e = errno;
1249
725
perror_plus("socket");
1256
732
goto mandos_end;
1257
733
}
1258
734
735
memset(&to, 0, sizeof(to));
1259
736
if(af == AF_INET6){
1260
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1261
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1262
ret = inet_pton(af, ip, &to6->sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1263
739
} else { /* IPv4 */
1264
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1265
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1266
ret = inet_pton(af, ip, &to4->sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1267
742
}
1268
743
if(ret < 0 ){
1269
744
int e = errno;
1339
814
goto mandos_end;
1340
815
}
1341
816
1342
while(true){
1343
if(af == AF_INET6){
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1346
} else {
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1349
}
1350
if(ret < 0){
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1357
&to)->sin6_addr)))
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1368
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1372
*/
1373
if(debug){
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1375
" direct route\n");
1376
}
1377
int e = errno;
1378
route_added = add_local_route(ip, if_index);
1379
if(route_added){
1380
continue;
1381
}
1382
errno = e;
1383
}
1384
if(errno != ECONNREFUSED or debug){
1385
int e = errno;
1386
perror_plus("connect");
1387
errno = e;
1388
}
1389
goto mandos_end;
1390
}
1391
1392
if(quit_now){
1393
errno = EINTR;
1394
goto mandos_end;
1395
}
1396
break;
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1397
836
}
1398
837
1399
838
const char *out = mandos_protocol_version;
1553
992
&decrypted_buffer, mc);
1554
993
if(decrypted_buffer_size >= 0){
1555
994
1556
clearerr(stdout);
1557
995
written = 0;
1558
996
while(written < (size_t) decrypted_buffer_size){
1559
997
if(quit_now){
1575
1013
}
1576
1014
written += (size_t)ret;
1577
1015
}
1578
ret = fflush(stdout);
1579
if(ret != 0){
1580
int e = errno;
1581
if(debug){
1582
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1583
strerror(errno));
1584
}
1585
errno = e;
1586
goto mandos_end;
1587
}
1588
1016
retval = 0;
1589
1017
}
1590
1018
}
1593
1021
1594
1022
mandos_end:
1595
1023
{
1596
if(route_added){
1597
if(not delete_local_route(ip, if_index)){
1598
fprintf_plus(stderr, "Failed to delete local route to %s on"
1599
" interface %d", ip, if_index);
1600
}
1601
}
1602
1024
int e = errno;
1603
1025
free(decrypted_buffer);
1604
1026
free(buffer);
1605
1027
if(tcp_sd >= 0){
1606
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1607
1029
}
1608
1030
if(ret == -1){
1609
1031
if(e == 0){
1621
1043
return retval;
1622
1044
}
1623
1045
1046
__attribute__((nonnull))
1624
1047
static void resolve_callback(AvahiSServiceResolver *r,
1625
1048
AvahiIfIndex interface,
1626
1049
AvahiProtocol proto,
1643
1066
timed out */
1644
1067
1645
1068
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1647
1069
return;
1648
1070
}
1649
1071
1763
1185
__attribute__((nonnull, warn_unused_result))
1764
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1765
1187
int ret;
1766
int old_errno;
1188
error_t ret_errno;
1767
1189
1768
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1769
1191
if(s < 0){
1770
old_errno = errno;
1192
ret_errno = errno;
1771
1193
perror_plus("socket");
1772
errno = old_errno;
1194
errno = ret_errno;
1773
1195
return false;
1774
1196
}
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1777
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1778
1199
if(ret == -1){
1779
1200
if(debug){
1780
old_errno = errno;
1201
ret_errno = errno;
1781
1202
perror_plus("ioctl SIOCGIFFLAGS");
1782
errno = old_errno;
1783
}
1784
if((close(s) == -1) and debug){
1785
old_errno = errno;
1786
perror_plus("close");
1787
errno = old_errno;
1203
errno = ret_errno;
1788
1204
}
1789
1205
return false;
1790
1206
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1796
1207
return true;
1797
1208
}
1798
1209
2040
1451
}
2041
1452
}
2042
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
2043
1506
__attribute__((nonnull))
2044
1507
void run_network_hooks(const char *mode, const char *interface,
2045
1508
const float delay){
2046
1509
struct dirent **direntries = NULL;
2047
1510
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
1511
hookdir_fd = open(hookdir, O_RDONLY);
2050
1512
if(hookdir_fd == -1){
2051
1513
if(errno == ENOENT){
2052
1514
if(debug){
2059
1521
return;
2060
1522
}
2061
1523
}
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2063
if(devnull == -1){
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2065
return;
2066
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
2067
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
2069
1536
if(numhooks == -1){
2070
1537
perror_plus("scandir");
2071
close(devnull);
2072
1538
return;
2073
1539
}
2074
1540
struct dirent *direntry;
2075
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
2076
1543
for(int i = 0; i < numhooks; i++){
2077
1544
direntry = direntries[i];
2078
1545
if(debug){
2102
1569
perror_plus("setgroups");
2103
1570
_exit(EX_NOPERM);
2104
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
2105
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
1588
if(ret == -1){
2107
1589
perror_plus("setenv");
2142
1624
_exit(EX_OSERR);
2143
1625
}
2144
1626
}
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2146
direntry->d_name,
2147
O_RDONLY));
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2148
1628
if(hook_fd == -1){
2149
1629
perror_plus("openat");
2150
1630
_exit(EXIT_FAILURE);
2151
1631
}
2152
if(close(hookdir_fd) == -1){
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2153
1633
perror_plus("close");
2154
1634
_exit(EXIT_FAILURE);
2155
1635
}
2156
ret = dup2(devnull, STDIN_FILENO);
2157
if(ret == -1){
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2159
_exit(EX_OSERR);
2160
}
2161
ret = close(devnull);
2162
if(ret == -1){
2163
perror_plus("close");
2164
_exit(EX_OSERR);
2165
}
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2167
if(ret == -1){
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2169
_exit(EX_OSERR);
2170
}
2171
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2172
1637
environ) == -1){
2173
1638
perror_plus("fexecve");
2174
1639
_exit(EXIT_FAILURE);
2175
1640
}
2176
1641
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
1642
int status;
2183
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
1644
perror_plus("waitpid");
2185
free(direntry);
2186
1645
continue;
2187
1646
}
2188
1647
if(WIFEXITED(status)){
2190
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
1650
" with status %d\n", direntry->d_name,
2192
1651
WEXITSTATUS(status));
2193
free(direntry);
2194
1652
continue;
2195
1653
}
2196
1654
} else if(WIFSIGNALED(status)){
2197
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
1656
" signal %d\n", direntry->d_name,
2199
1657
WTERMSIG(status));
2200
free(direntry);
2201
1658
continue;
2202
1659
} else {
2203
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
1661
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
1662
continue;
2207
1663
}
2208
1664
}
2210
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
1667
direntry->d_name);
2212
1668
}
2213
free(direntry);
2214
1669
}
2215
1670
free(direntries);
2216
if(close(hookdir_fd) == -1){
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2217
1672
perror_plus("close");
2218
1673
} else {
2219
1674
hookdir_fd = -1;
2222
1677
}
2223
1678
2224
1679
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
2228
1683
int ret;
2229
1684
struct ifreq network;
2230
1685
unsigned int if_index = if_nametoindex(interface);
2240
1695
}
2241
1696
2242
1697
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
1698
error_t ret_errno = 0, ioctl_errno = 0;
2245
1699
if(not get_flags(interface, &network)){
2246
1700
ret_errno = errno;
2247
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2260
1714
}
2261
1715
2262
1716
if(quit_now){
2263
ret = close(sd);
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2264
1718
if(ret == -1){
2265
1719
perror_plus("close");
2266
1720
}
2316
1770
}
2317
1771
2318
1772
/* Close the socket */
2319
ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2320
1774
if(ret == -1){
2321
1775
perror_plus("close");
2322
1776
}
2334
1788
2335
1789
/* Sleep checking until interface is running.
2336
1790
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
1791
for(int i=0; i < delay * 4; i++){
2338
1792
if(interface_is_running(interface)){
2339
1793
break;
2340
1794
}
2350
1804
}
2351
1805
2352
1806
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
2355
1809
struct ifreq network;
2356
1810
unsigned int if_index = if_nametoindex(interface);
2357
1811
if(if_index == 0){
2360
1814
return ENXIO;
2361
1815
}
2362
1816
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
1817
error_t ret_errno = 0, ioctl_errno = 0;
2365
1818
if(not get_flags(interface, &network) and debug){
2366
1819
ret_errno = errno;
2367
1820
fprintf_plus(stderr, "Failed to get flags for interface "
2405
1858
}
2406
1859
2407
1860
/* Close the socket */
2408
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2409
1862
if(ret == -1){
2410
1863
perror_plus("close");
2411
1864
}
2426
1879
}
2427
1880
2428
1881
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2434
1886
AvahiSServiceBrowser *sb = NULL;
2435
1887
error_t ret_errno;
2436
1888
int ret;
2445
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2446
1898
const char *seckey = PATHDIR "/" SECKEY;
2447
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
1900
char *interfaces_hooks = NULL;
2450
1901
2451
1902
bool gnutls_initialized = false;
2504
1955
.doc = "Bit length of the prime number used in the"
2505
1956
" Diffie-Hellman key exchange",
2506
1957
.group = 2 },
2507
{ .name = "dh-params", .key = 134,
2508
.arg = "FILE",
2509
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2510
" for the Diffie-Hellman key exchange",
2511
.group = 2 },
2512
1958
{ .name = "priority", .key = 130,
2513
1959
.arg = "STRING",
2514
1960
.doc = "GnuTLS priority string for the TLS handshake",
2569
2015
}
2570
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2571
2017
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
2575
2018
case 130: /* --priority */
2576
2019
mc.priority = arg;
2577
2020
break;
2617
2060
.args_doc = "",
2618
2061
.doc = "Mandos client -- Get and decrypt"
2619
2062
" passwords from a Mandos server" };
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2623
2066
case 0:
2624
2067
break;
2625
2068
case ENOMEM:
2626
2069
default:
2627
errno = ret_errno;
2070
errno = ret;
2628
2071
perror_plus("argp_parse");
2629
2072
exitcode = EX_OSERR;
2630
2073
goto end;
2633
2076
goto end;
2634
2077
}
2635
2078
}
2636
2079
2637
2080
{
2638
2081
/* Work around Debian bug #633582:
2639
<https://bugs.debian.org/633582> */
2082
<http://bugs.debian.org/633582> */
2640
2083
2641
2084
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2645
2088
perror_plus("Failed to raise privileges");
2646
2089
} else {
2647
2090
struct stat st;
2663
2106
}
2664
2107
}
2665
2108
}
2666
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2667
2110
}
2668
2111
}
2669
2112
2670
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2672
2115
if(pubkey_fd == -1){
2684
2127
}
2685
2128
}
2686
2129
}
2687
close(pubkey_fd);
2688
}
2689
}
2690
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2696
} else {
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2698
if(ret == -1){
2699
perror_plus("fstat");
2700
} else {
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2704
if(ret == -1){
2705
perror_plus("fchown");
2706
}
2707
}
2708
}
2709
close(dhparams_fd);
2710
}
2711
}
2712
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2713
2134
/* Lower privileges */
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2717
2138
perror_plus("Failed to lower privileges");
2718
2139
}
2719
2140
}
2844
2265
if(ret_errno != 0){
2845
2266
errno = ret_errno;
2846
2267
perror_plus("argz_add");
2847
free(direntries[i]);
2848
2268
continue;
2849
2269
}
2850
2270
if(debug){
2851
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
2272
direntries[i]->d_name);
2853
2273
}
2854
free(direntries[i]);
2855
2274
}
2856
2275
free(direntries);
2857
2276
} else {
2889
2308
errno = bring_up_interface(interface, delay);
2890
2309
if(not interface_was_up){
2891
2310
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2311
perror_plus("Failed to bring up interface");
2894
2312
} else {
2895
2313
errno = argz_add(&interfaces_to_take_down,
2896
2314
&interfaces_to_take_down_size,
2919
2337
goto end;
2920
2338
}
2921
2339
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2923
2341
if(ret == -1){
2924
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2925
2343
exitcode = EX_UNAVAILABLE;
3047
2465
3048
2466
/* Allocate a new server */
3049
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
2468
&config, NULL, NULL, &ret_errno);
3051
2469
3052
2470
/* Free the Avahi configuration data */
3053
2471
avahi_server_config_free(&config);
3056
2474
/* Check if creating the Avahi server object succeeded */
3057
2475
if(mc.server == NULL){
3058
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
2477
avahi_strerror(ret_errno));
3060
2478
exitcode = EX_UNAVAILABLE;
3061
2479
goto end;
3062
2480
}
3097
2515
end:
3098
2516
3099
2517
if(debug){
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3104
} else {
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3106
}
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3107
2519
}
3108
2520
3109
2521
/* Cleanup things */
3120
2532
3121
2533
if(gnutls_initialized){
3122
2534
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
3123
2536
gnutls_dh_params_deinit(mc.dh_params);
3124
2537
}
3125
2538
3133
2546
mc.current_server->prev->next = NULL;
3134
2547
while(mc.current_server != NULL){
3135
2548
server *next = mc.current_server->next;
3136
#ifdef __GNUC__
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3139
#endif
3140
free((char *)(mc.current_server->ip));
3141
#ifdef __GNUC__
3142
#pragma GCC diagnostic pop
3143
#endif
3144
2549
free(mc.current_server);
3145
2550
mc.current_server = next;
3146
2551
}
3148
2553
3149
2554
/* Re-raise privileges */
3150
2555
{
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
3154
2559
perror_plus("Failed to raise privileges");
3155
2560
} else {
3156
2561
3161
2566
/* Take down the network interfaces which were brought up */
3162
2567
{
3163
2568
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3166
interface))){
3167
ret = take_down_interface(interface);
3168
if(ret != 0){
3169
errno = ret;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
3170
2575
perror_plus("Failed to take down interface");
3171
2576
}
3172
2577
}
3177
2582
}
3178
2583
}
3179
2584
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
3183
2588
perror_plus("Failed to lower privileges permanently");
3184
2589
}
3185
2590
}
3187
2592
free(interfaces_to_take_down);
3188
2593
free(interfaces_hooks);
3189
2594
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
3192
struct dirent **direntries = NULL;
3193
int dret;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3195
O_RDONLY
3196
| O_NOFOLLOW
3197
| O_DIRECTORY
3198
| O_PATH));
3199
if(dir_fd == -1){
3200
perror_plus("open");
3201
return;
3202
}
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
3206
for(int i = 0; i < numentries; i++){
3207
if(debug){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3210
}
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3212
if(dret == -1){
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3215
AT_REMOVEDIR);
3216
}
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3222
dret = 0;
3223
}
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3227
}
3228
}
3229
free(direntries[i]);
3230
}
3231
3232
/* need to clean even if 0 because man page doesn't specify */
3233
free(direntries);
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3237
}
3238
} else {
3239
perror_plus("scandirat");
3240
}
3241
close(dir_fd);
3242
}
3243
3244
2595
/* Removes the GPGME temp directory and all files inside */
3245
2596
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2597
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2636
}
3247
2637
}
3248
2638
3249
2639
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0