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- Committer: Teddy Hogeborn
- Date: 2018-08-15 09:18:22 UTC
- Revision ID: teddy@recompile.se-20180815091822-tmmqryi0gqnzq6ab
mandos: Better error message if self-signature verification fails
* mandos (ClientHandler.fingerprint): If the verification of the
self-signature fails, report the actual error message instead of a
generic message.
* mandos (ClientHandler.fingerprint): If the verification of the
self-signature fails, report the actual error message instead of a
generic message.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 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
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
234
240
.af = af };
235
241
if(new_server->ip == NULL){
236
242
perror_plus("strdup");
243
free(new_server);
237
244
return false;
238
245
}
239
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
247
if(ret == -1){
241
248
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);
242
258
return false;
243
259
}
244
260
/* Special case of first server */
294
310
gpgme_strsource(rc), gpgme_strerror(rc));
295
311
return false;
296
312
}
313
{
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
320
fprintf_plus(stderr,
321
"The total number of considered keys: %d\n",
322
import_result->considered);
323
fprintf_plus(stderr,
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
326
fprintf_plus(stderr,
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
341
fprintf_plus(stderr,
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
344
fprintf_plus(stderr,
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
347
fprintf_plus(stderr,
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
357
import_status->fpr);
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
362
}
363
fprintf_plus(stderr, "Key status:\n");
364
fprintf_plus(stderr,
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
368
fprintf_plus(stderr,
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
372
fprintf_plus(stderr,
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
376
fprintf_plus(stderr,
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
380
fprintf_plus(stderr,
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
384
}
385
return false;
386
}
387
}
297
388
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
389
ret = close(fd);
299
390
if(ret == -1){
300
391
perror_plus("close");
301
392
}
340
431
/* Create new GPGME "context" */
341
432
rc = gpgme_new(&(mc->ctx));
342
433
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
346
436
return false;
347
437
}
348
438
384
474
/* Create new empty GPGME data buffer for the plaintext */
385
475
rc = gpgme_data_new(&dh_plain);
386
476
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
389
478
gpgme_strsource(rc), gpgme_strerror(rc));
390
479
gpgme_data_release(dh_crypto);
391
480
return -1;
404
493
if(result == NULL){
405
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
406
495
} else {
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);
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
499
}
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
411
502
if(result->file_name != NULL){
412
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
413
504
}
414
gpgme_recipient_t recipient;
415
recipient = result->recipients;
416
while(recipient != NULL){
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
417
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
421
511
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
425
513
}
426
514
}
427
515
}
483
571
return plaintext_length;
484
572
}
485
573
574
__attribute__((warn_unused_result, const))
575
static const char *safe_string(const char *str){
576
if(str == NULL)
577
return "(unknown)";
578
return str;
579
}
580
486
581
__attribute__((warn_unused_result))
487
582
static const char *safer_gnutls_strerror(int value){
488
583
const char *ret = gnutls_strerror(value);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
584
return safe_string(ret);
492
585
}
493
586
494
587
/* GnuTLS log function callback */
498
591
fprintf_plus(stderr, "GnuTLS: %s", string);
499
592
}
500
593
501
__attribute__((nonnull, warn_unused_result))
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
502
595
static int init_gnutls_global(const char *pubkeyfilename,
503
596
const char *seckeyfilename,
597
const char *dhparamsfilename,
504
598
mandos_context *mc){
505
599
int ret;
600
unsigned int uret;
506
601
507
602
if(debug){
508
603
fprintf_plus(stderr, "Initializing GnuTLS\n");
509
604
}
510
605
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
518
606
if(debug){
519
607
/* "Use a log level over 10 to enable all debugging options."
520
608
* - GnuTLS manual
528
616
if(ret != GNUTLS_E_SUCCESS){
529
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
618
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
532
619
return -1;
533
620
}
534
621
559
646
safer_gnutls_strerror(ret));
560
647
goto globalfail;
561
648
}
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
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
652
do {
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
654
if(dhpfile == -1){
655
perror_plus("open");
656
dhparamsfilename = NULL;
657
break;
658
}
659
size_t params_capacity = 0;
660
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
669
break;
670
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
673
BUFFER_SIZE);
674
/* EOF */
675
if(bytes_read == 0){
676
break;
677
}
678
/* check bytes_read for failure */
679
if(bytes_read < 0){
680
perror_plus("read");
681
free(params.data);
682
params.data = NULL;
683
dhparamsfilename = NULL;
684
break;
685
}
686
params.size += (unsigned int)bytes_read;
687
}
688
ret = close(dhpfile);
689
if(ret == -1){
690
perror_plus("close");
691
}
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
694
}
695
if(dhparamsfilename == NULL){
696
break;
697
}
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
705
}
706
free(params.data);
707
} while(false);
708
}
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
do {
715
int secfile = open(seckeyfilename, O_RDONLY);
716
if(secfile == -1){
717
perror_plus("open");
718
break;
719
}
720
size_t buffer_capacity = 0;
721
while(true){
722
buffer_capacity = incbuffer((char **)&buffer.data,
723
(size_t)buffer.size,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
727
free(buffer.data);
728
buffer.data = NULL;
729
break;
730
}
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
733
BUFFER_SIZE);
734
/* EOF */
735
if(bytes_read == 0){
736
break;
737
}
738
/* check bytes_read for failure */
739
if(bytes_read < 0){
740
perror_plus("read");
741
free(buffer.data);
742
buffer.data = NULL;
743
break;
744
}
745
buffer.size += (unsigned int)bytes_read;
746
}
747
close(secfile);
748
} while(false);
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
752
{
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
758
safer_gnutls_strerror(ret));
759
free(buffer.data);
760
buffer.data = NULL;
761
} else {
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
767
privkey = NULL;
768
}
769
free(buffer.data);
770
buffer.data = NULL;
771
if(privkey != NULL){
772
/* Use private key to suggest an appropriate
773
sec_param */
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
776
if(debug){
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
780
(sec_param)));
781
}
782
}
783
}
784
}
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
788
if(debug){
789
fprintf_plus(stderr, "Falling back to security parameter"
790
" \"%s\"\n",
791
safe_string(gnutls_sec_param_get_name
792
(sec_param)));
793
}
794
}
795
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
799
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
805
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
810
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
813
}
814
} else if(debug){
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
mc->dh_bits);
817
}
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
823
goto globalfail;
824
}
825
}
569
826
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
570
827
571
828
return 0;
573
830
globalfail:
574
831
575
832
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
577
833
gnutls_dh_params_deinit(mc->dh_params);
578
834
return -1;
579
835
}
631
887
/* ignore client certificate if any. */
632
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
889
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
636
890
return 0;
637
891
}
638
892
640
894
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
641
895
__attribute__((unused)) const char *txt){}
642
896
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
901
int ret = 0;
902
if(seteuid(0) == -1){
903
ret = errno;
904
}
905
errno = old_errno;
906
return ret;
907
}
908
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
914
if(ret != 0){
915
errno = old_errno;
916
return ret;
917
}
918
if(setuid(0) == -1){
919
ret = errno;
920
}
921
errno = old_errno;
922
return ret;
923
}
924
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
929
int ret = 0;
930
if(seteuid(uid) == -1){
931
ret = errno;
932
}
933
errno = old_errno;
934
return ret;
935
}
936
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
941
int ret = 0;
942
if(setuid(uid) == -1){
943
ret = errno;
944
}
945
errno = old_errno;
946
return ret;
947
}
948
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
952
const char *address,
953
AvahiIfIndex if_index){
954
int ret;
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
961
if(debug){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
964
}
965
return false;
966
}
967
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
971
return false;
972
}
973
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
975
if(devnull == -1){
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
977
return false;
978
}
979
pid_t pid = fork();
980
if(pid == 0){
981
/* Child */
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
984
if(errno != 0){
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
987
} else {
988
/* Set group */
989
errno = 0;
990
ret = setgid(0);
991
if(ret == -1){
992
perror_plus("setgid");
993
_exit(EX_NOPERM);
994
}
995
/* Reset supplementary groups */
996
errno = 0;
997
ret = setgroups(0, NULL);
998
if(ret == -1){
999
perror_plus("setgroups");
1000
_exit(EX_NOPERM);
1001
}
1002
}
1003
ret = dup2(devnull, STDIN_FILENO);
1004
if(ret == -1){
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1006
_exit(EX_OSERR);
1007
}
1008
ret = close(devnull);
1009
if(ret == -1){
1010
perror_plus("close");
1011
_exit(EX_OSERR);
1012
}
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
if(ret == -1){
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1016
_exit(EX_OSERR);
1017
}
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1019
O_RDONLY
1020
| O_DIRECTORY
1021
| O_PATH
1022
| O_CLOEXEC));
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1026
}
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1028
helper, O_RDONLY));
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1033
}
1034
close(helperdir_fd);
1035
#ifdef __GNUC__
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1038
#endif
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1042
environ) == -1){
1043
#ifdef __GNUC__
1044
#pragma GCC diagnostic pop
1045
#endif
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1048
}
1049
}
1050
if(pid == -1){
1051
perror_plus("fork");
1052
return false;
1053
}
1054
int status;
1055
pid_t pret = -1;
1056
errno = 0;
1057
do {
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1065
}
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1068
}
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1071
" helper program");
1072
}
1073
return false;
1074
}
1075
} while(pret == -1 and errno == EINTR);
1076
if(pret == -1){
1077
perror_plus("waitpid");
1078
return false;
1079
}
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1084
return false;
1085
}
1086
return true;
1087
}
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1091
return false;
1092
}
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1094
return false;
1095
}
1096
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1100
if(debug){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1102
}
1103
return add_delete_local_route(true, address, if_index);
1104
}
1105
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1109
if(debug){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1111
}
1112
return add_delete_local_route(false, address, if_index);
1113
}
1114
643
1115
/* Called when a Mandos server is found */
644
1116
__attribute__((nonnull, warn_unused_result))
645
1117
static int start_mandos_communication(const char *ip, in_port_t port,
656
1128
int retval = -1;
657
1129
gnutls_session_t session;
658
1130
int pf; /* Protocol family */
1131
bool route_added = false;
659
1132
660
1133
errno = 0;
661
1134
683
1156
bool match = false;
684
1157
{
685
1158
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
688
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
689
1163
match = true;
690
1164
break;
719
1193
PRIuMAX "\n", ip, (uintmax_t)port);
720
1194
}
721
1195
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
723
1197
if(tcp_sd < 0){
724
1198
int e = errno;
725
1199
perror_plus("socket");
732
1206
goto mandos_end;
733
1207
}
734
1208
735
memset(&to, 0, sizeof(to));
736
1209
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
739
1213
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
742
1217
}
743
1218
if(ret < 0 ){
744
1219
int e = errno;
814
1289
goto mandos_end;
815
1290
}
816
1291
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;
1292
while(true){
1293
if(af == AF_INET6){
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1296
} else {
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1299
}
1300
if(ret < 0){
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1307
&to)->sin6_addr)))
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1318
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1322
*/
1323
if(debug){
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1325
" direct route\n");
1326
}
1327
int e = errno;
1328
route_added = add_local_route(ip, if_index);
1329
if(route_added){
1330
continue;
1331
}
1332
errno = e;
1333
}
1334
if(errno != ECONNREFUSED or debug){
1335
int e = errno;
1336
perror_plus("connect");
1337
errno = e;
1338
}
1339
goto mandos_end;
1340
}
1341
1342
if(quit_now){
1343
errno = EINTR;
1344
goto mandos_end;
1345
}
1346
break;
836
1347
}
837
1348
838
1349
const char *out = mandos_protocol_version;
992
1503
&decrypted_buffer, mc);
993
1504
if(decrypted_buffer_size >= 0){
994
1505
1506
clearerr(stdout);
995
1507
written = 0;
996
1508
while(written < (size_t) decrypted_buffer_size){
997
1509
if(quit_now){
1013
1525
}
1014
1526
written += (size_t)ret;
1015
1527
}
1528
ret = fflush(stdout);
1529
if(ret != 0){
1530
int e = errno;
1531
if(debug){
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1533
strerror(errno));
1534
}
1535
errno = e;
1536
goto mandos_end;
1537
}
1016
1538
retval = 0;
1017
1539
}
1018
1540
}
1021
1543
1022
1544
mandos_end:
1023
1545
{
1546
if(route_added){
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1550
}
1551
}
1024
1552
int e = errno;
1025
1553
free(decrypted_buffer);
1026
1554
free(buffer);
1027
1555
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1556
ret = close(tcp_sd);
1029
1557
}
1030
1558
if(ret == -1){
1031
1559
if(e == 0){
1043
1571
return retval;
1044
1572
}
1045
1573
1046
__attribute__((nonnull))
1047
1574
static void resolve_callback(AvahiSServiceResolver *r,
1048
1575
AvahiIfIndex interface,
1049
1576
AvahiProtocol proto,
1066
1593
timed out */
1067
1594
1068
1595
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1069
1597
return;
1070
1598
}
1071
1599
1185
1713
__attribute__((nonnull, warn_unused_result))
1186
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1715
int ret;
1188
error_t ret_errno;
1716
int old_errno;
1189
1717
1190
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1719
if(s < 0){
1192
ret_errno = errno;
1720
old_errno = errno;
1193
1721
perror_plus("socket");
1194
errno = ret_errno;
1722
errno = old_errno;
1195
1723
return false;
1196
1724
}
1197
strcpy(ifr->ifr_name, ifname);
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1198
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1728
if(ret == -1){
1200
1729
if(debug){
1201
ret_errno = errno;
1730
old_errno = errno;
1202
1731
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1204
1738
}
1205
1739
return false;
1206
1740
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1207
1746
return true;
1208
1747
}
1209
1748
1451
1990
}
1452
1991
}
1453
1992
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
1506
1993
__attribute__((nonnull))
1507
1994
void run_network_hooks(const char *mode, const char *interface,
1508
1995
const float delay){
1509
1996
struct dirent **direntries = NULL;
1510
1997
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| O_CLOEXEC);
1512
2000
if(hookdir_fd == -1){
1513
2001
if(errno == ENOENT){
1514
2002
if(debug){
1521
2009
return;
1522
2010
}
1523
2011
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2013
if(devnull == -1){
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2015
return;
2016
}
1526
2017
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
2018
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__ */
1536
2019
if(numhooks == -1){
1537
2020
perror_plus("scandir");
2021
close(devnull);
1538
2022
return;
1539
2023
}
1540
2024
struct dirent *direntry;
1541
2025
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
2026
for(int i = 0; i < numhooks; i++){
1544
2027
direntry = direntries[i];
1545
2028
if(debug){
1569
2052
perror_plus("setgroups");
1570
2053
_exit(EX_NOPERM);
1571
2054
}
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
}
1587
2055
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
2056
if(ret == -1){
1589
2057
perror_plus("setenv");
1624
2092
_exit(EX_OSERR);
1625
2093
}
1626
2094
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
1628
2098
if(hook_fd == -1){
1629
2099
perror_plus("openat");
1630
2100
_exit(EXIT_FAILURE);
1631
2101
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2102
if(close(hookdir_fd) == -1){
1633
2103
perror_plus("close");
1634
2104
_exit(EXIT_FAILURE);
1635
2105
}
2106
ret = dup2(devnull, STDIN_FILENO);
2107
if(ret == -1){
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2109
_exit(EX_OSERR);
2110
}
2111
ret = close(devnull);
2112
if(ret == -1){
2113
perror_plus("close");
2114
_exit(EX_OSERR);
2115
}
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2117
if(ret == -1){
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2119
_exit(EX_OSERR);
2120
}
1636
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
2122
environ) == -1){
1638
2123
perror_plus("fexecve");
1639
2124
_exit(EXIT_FAILURE);
1640
2125
}
1641
2126
} else {
2127
if(hook_pid == -1){
2128
perror_plus("fork");
2129
free(direntry);
2130
continue;
2131
}
1642
2132
int status;
1643
2133
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
2134
perror_plus("waitpid");
2135
free(direntry);
1645
2136
continue;
1646
2137
}
1647
2138
if(WIFEXITED(status)){
1649
2140
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
2141
" with status %d\n", direntry->d_name,
1651
2142
WEXITSTATUS(status));
2143
free(direntry);
1652
2144
continue;
1653
2145
}
1654
2146
} else if(WIFSIGNALED(status)){
1655
2147
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
2148
" signal %d\n", direntry->d_name,
1657
2149
WTERMSIG(status));
2150
free(direntry);
1658
2151
continue;
1659
2152
} else {
1660
2153
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
2154
" crashed\n", direntry->d_name);
2155
free(direntry);
1662
2156
continue;
1663
2157
}
1664
2158
}
1666
2160
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
2161
direntry->d_name);
1668
2162
}
2163
free(direntry);
1669
2164
}
1670
2165
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2166
if(close(hookdir_fd) == -1){
1672
2167
perror_plus("close");
1673
2168
} else {
1674
2169
hookdir_fd = -1;
1677
2172
}
1678
2173
1679
2174
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
1683
2178
int ret;
1684
2179
struct ifreq network;
1685
2180
unsigned int if_index = if_nametoindex(interface);
1695
2190
}
1696
2191
1697
2192
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
1699
2195
if(not get_flags(interface, &network)){
1700
2196
ret_errno = errno;
1701
2197
fprintf_plus(stderr, "Failed to get flags for interface "
1714
2210
}
1715
2211
1716
2212
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2213
ret = close(sd);
1718
2214
if(ret == -1){
1719
2215
perror_plus("close");
1720
2216
}
1770
2266
}
1771
2267
1772
2268
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
ret = close(sd);
1774
2270
if(ret == -1){
1775
2271
perror_plus("close");
1776
2272
}
1788
2284
1789
2285
/* Sleep checking until interface is running.
1790
2286
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
2287
for(int i = 0; i < delay * 4; i++){
1792
2288
if(interface_is_running(interface)){
1793
2289
break;
1794
2290
}
1804
2300
}
1805
2301
1806
2302
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
1809
2305
struct ifreq network;
1810
2306
unsigned int if_index = if_nametoindex(interface);
1811
2307
if(if_index == 0){
1814
2310
return ENXIO;
1815
2311
}
1816
2312
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1818
2315
if(not get_flags(interface, &network) and debug){
1819
2316
ret_errno = errno;
1820
2317
fprintf_plus(stderr, "Failed to get flags for interface "
1858
2355
}
1859
2356
1860
2357
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2358
int ret = close(sd);
1862
2359
if(ret == -1){
1863
2360
perror_plus("close");
1864
2361
}
1879
2376
}
1880
2377
1881
2378
int main(int argc, char *argv[]){
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 };
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
1886
2384
AvahiSServiceBrowser *sb = NULL;
1887
2385
error_t ret_errno;
1888
2386
int ret;
1897
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
2396
const char *seckey = PATHDIR "/" SECKEY;
1899
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
1900
2399
char *interfaces_hooks = NULL;
1901
2400
1902
2401
bool gnutls_initialized = false;
1955
2454
.doc = "Bit length of the prime number used in the"
1956
2455
" Diffie-Hellman key exchange",
1957
2456
.group = 2 },
2457
{ .name = "dh-params", .key = 134,
2458
.arg = "FILE",
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2461
.group = 2 },
1958
2462
{ .name = "priority", .key = 130,
1959
2463
.arg = "STRING",
1960
2464
.doc = "GnuTLS priority string for the TLS handshake",
2015
2519
}
2016
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2017
2521
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
2018
2525
case 130: /* --priority */
2019
2526
mc.priority = arg;
2020
2527
break;
2060
2567
.args_doc = "",
2061
2568
.doc = "Mandos client -- Get and decrypt"
2062
2569
" passwords from a Mandos server" };
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
2066
2573
case 0:
2067
2574
break;
2068
2575
case ENOMEM:
2069
2576
default:
2070
errno = ret;
2577
errno = ret_errno;
2071
2578
perror_plus("argp_parse");
2072
2579
exitcode = EX_OSERR;
2073
2580
goto end;
2076
2583
goto end;
2077
2584
}
2078
2585
}
2079
2586
2080
2587
{
2081
2588
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2589
<https://bugs.debian.org/633582> */
2083
2590
2084
2591
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2088
2595
perror_plus("Failed to raise privileges");
2089
2596
} else {
2090
2597
struct stat st;
2106
2613
}
2107
2614
}
2108
2615
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2616
close(seckey_fd);
2110
2617
}
2111
2618
}
2112
2619
2113
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
2621
int pubkey_fd = open(pubkey, O_RDONLY);
2115
2622
if(pubkey_fd == -1){
2127
2634
}
2128
2635
}
2129
2636
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2637
close(pubkey_fd);
2638
}
2639
}
2640
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2646
} else {
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2648
if(ret == -1){
2649
perror_plus("fstat");
2650
} else {
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2654
if(ret == -1){
2655
perror_plus("fchown");
2656
}
2657
}
2658
}
2659
close(dhparams_fd);
2660
}
2661
}
2662
2134
2663
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2138
2667
perror_plus("Failed to lower privileges");
2139
2668
}
2140
2669
}
2265
2794
if(ret_errno != 0){
2266
2795
errno = ret_errno;
2267
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2268
2798
continue;
2269
2799
}
2270
2800
if(debug){
2271
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
2802
direntries[i]->d_name);
2273
2803
}
2804
free(direntries[i]);
2274
2805
}
2275
2806
free(direntries);
2276
2807
} else {
2308
2839
errno = bring_up_interface(interface, delay);
2309
2840
if(not interface_was_up){
2310
2841
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2312
2844
} else {
2313
2845
errno = argz_add(&interfaces_to_take_down,
2314
2846
&interfaces_to_take_down_size,
2337
2869
goto end;
2338
2870
}
2339
2871
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2341
2873
if(ret == -1){
2342
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2343
2875
exitcode = EX_UNAVAILABLE;
2465
2997
2466
2998
/* Allocate a new server */
2467
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
3000
&config, NULL, NULL, &ret);
2469
3001
2470
3002
/* Free the Avahi configuration data */
2471
3003
avahi_server_config_free(&config);
2474
3006
/* Check if creating the Avahi server object succeeded */
2475
3007
if(mc.server == NULL){
2476
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
3009
avahi_strerror(ret));
2478
3010
exitcode = EX_UNAVAILABLE;
2479
3011
goto end;
2480
3012
}
2515
3047
end:
2516
3048
2517
3049
if(debug){
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3054
} else {
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3056
}
2519
3057
}
2520
3058
2521
3059
/* Cleanup things */
2532
3070
2533
3071
if(gnutls_initialized){
2534
3072
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
2536
3073
gnutls_dh_params_deinit(mc.dh_params);
2537
3074
}
2538
3075
2546
3083
mc.current_server->prev->next = NULL;
2547
3084
while(mc.current_server != NULL){
2548
3085
server *next = mc.current_server->next;
3086
#ifdef __GNUC__
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3089
#endif
3090
free((char *)(mc.current_server->ip));
3091
#ifdef __GNUC__
3092
#pragma GCC diagnostic pop
3093
#endif
2549
3094
free(mc.current_server);
2550
3095
mc.current_server = next;
2551
3096
}
2553
3098
2554
3099
/* Re-raise privileges */
2555
3100
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
2559
3104
perror_plus("Failed to raise privileges");
2560
3105
} else {
2561
3106
2566
3111
/* Take down the network interfaces which were brought up */
2567
3112
{
2568
3113
char *interface = NULL;
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;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3116
interface))){
3117
ret = take_down_interface(interface);
3118
if(ret != 0){
3119
errno = ret;
2575
3120
perror_plus("Failed to take down interface");
2576
3121
}
2577
3122
}
2582
3127
}
2583
3128
}
2584
3129
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
2588
3133
perror_plus("Failed to lower privileges permanently");
2589
3134
}
2590
3135
}
2592
3137
free(interfaces_to_take_down);
2593
3138
free(interfaces_hooks);
2594
3139
3140
void clean_dir_at(int base, const char * const dirname,
3141
uintmax_t level){
3142
struct dirent **direntries = NULL;
3143
int dret;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3145
O_RDONLY
3146
| O_NOFOLLOW
3147
| O_DIRECTORY
3148
| O_PATH));
3149
if(dir_fd == -1){
3150
perror_plus("open");
3151
return;
3152
}
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3157
if(debug){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3160
}
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3162
if(dret == -1){
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3165
AT_REMOVEDIR);
3166
}
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3172
dret = 0;
3173
}
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3177
}
3178
}
3179
free(direntries[i]);
3180
}
3181
3182
/* need to clean even if 0 because man page doesn't specify */
3183
free(direntries);
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3187
}
3188
} else {
3189
perror_plus("scandirat");
3190
}
3191
close(dir_fd);
3192
}
3193
2595
3194
/* Removes the GPGME temp directory and all files inside */
2596
3195
if(tempdir != NULL){
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
}
3196
clean_dir_at(-1, tempdir, 0);
2637
3197
}
2638
3198
2639
3199
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0