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- Committer: Teddy Hogeborn
- Date: 2015-04-03 03:01:02 UTC
- Revision ID: teddy@recompile.se-20150403030102-xdxyaqcwc4wmqeyb
mandos: Do minor formatting and whitespace adjustments.
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,
310
304
gpgme_strsource(rc), gpgme_strerror(rc));
311
305
return false;
312
306
}
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
}
388
307
389
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
309
if(ret == -1){
391
310
perror_plus("close");
392
311
}
431
350
/* Create new GPGME "context" */
432
351
rc = gpgme_new(&(mc->ctx));
433
352
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
436
356
return false;
437
357
}
438
358
474
394
/* Create new empty GPGME data buffer for the plaintext */
475
395
rc = gpgme_data_new(&dh_plain);
476
396
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
478
399
gpgme_strsource(rc), gpgme_strerror(rc));
479
400
gpgme_data_release(dh_crypto);
480
401
return -1;
493
414
if(result == NULL){
494
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
495
416
} else {
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");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
502
421
if(result->file_name != NULL){
503
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
504
423
}
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
508
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
511
431
fprintf_plus(stderr, "Secret key available: %s\n",
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
513
435
}
514
436
}
515
437
}
591
513
fprintf_plus(stderr, "GnuTLS: %s", string);
592
514
}
593
515
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
595
517
static int init_gnutls_global(const char *pubkeyfilename,
596
518
const char *seckeyfilename,
597
const char *dhparamsfilename,
598
519
mandos_context *mc){
599
520
int ret;
600
521
unsigned int uret;
603
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
604
525
}
605
526
527
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
531
return -1;
532
}
533
606
534
if(debug){
607
535
/* "Use a log level over 10 to enable all debugging options."
608
536
* - GnuTLS manual
616
544
if(ret != GNUTLS_E_SUCCESS){
617
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
618
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
619
548
return -1;
620
549
}
621
550
646
575
safer_gnutls_strerror(ret));
647
576
goto globalfail;
648
577
}
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;
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
660
585
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
665
590
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
591
free(buffer.data);
592
buffer.data = NULL;
669
593
break;
670
594
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
673
596
BUFFER_SIZE);
674
597
/* EOF */
675
598
if(bytes_read == 0){
678
601
/* check bytes_read for failure */
679
602
if(bytes_read < 0){
680
603
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);
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
755
627
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
758
629
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
}
630
privkey = NULL;
783
631
}
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)));
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
793
644
}
794
645
}
795
646
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
799
650
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
802
653
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
654
(sec_param)));
805
655
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
809
664
safe_string(gnutls_sec_param_get_name
810
665
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
666
mc->dh_bits);
813
667
}
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,
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
822
672
safer_gnutls_strerror(ret));
823
673
goto globalfail;
824
674
}
825
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
683
goto globalfail;
684
}
685
826
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
827
687
828
688
return 0;
830
690
globalfail:
831
691
832
692
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
833
694
gnutls_dh_params_deinit(mc->dh_params);
834
695
return -1;
835
696
}
887
748
/* ignore client certificate if any. */
888
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
889
750
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
890
753
return 0;
891
754
}
892
755
894
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
895
758
__attribute__((unused)) const char *txt){}
896
759
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
1115
760
/* Called when a Mandos server is found */
1116
761
__attribute__((nonnull, warn_unused_result))
1117
762
static int start_mandos_communication(const char *ip, in_port_t port,
1128
773
int retval = -1;
1129
774
gnutls_session_t session;
1130
775
int pf; /* Protocol family */
1131
bool route_added = false;
1132
776
1133
777
errno = 0;
1134
778
1156
800
bool match = false;
1157
801
{
1158
802
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
803
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
804
interface))){
1162
805
if(if_nametoindex(interface) == (unsigned int)if_index){
1163
806
match = true;
1164
807
break;
1193
836
PRIuMAX "\n", ip, (uintmax_t)port);
1194
837
}
1195
838
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
839
tcp_sd = socket(pf, SOCK_STREAM, 0);
1197
840
if(tcp_sd < 0){
1198
841
int e = errno;
1199
842
perror_plus("socket");
1206
849
goto mandos_end;
1207
850
}
1208
851
852
memset(&to, 0, sizeof(to));
1209
853
if(af == AF_INET6){
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);
854
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
855
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1213
856
} else { /* IPv4 */
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);
857
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
858
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1217
859
}
1218
860
if(ret < 0 ){
1219
861
int e = errno;
1289
931
goto mandos_end;
1290
932
}
1291
933
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;
934
if(af == AF_INET6){
935
ret = connect(tcp_sd, (struct sockaddr *)&to,
936
sizeof(struct sockaddr_in6));
937
} else {
938
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
939
sizeof(struct sockaddr_in));
940
}
941
if(ret < 0){
942
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
943
int e = errno;
944
perror_plus("connect");
945
errno = e;
946
}
947
goto mandos_end;
948
}
949
950
if(quit_now){
951
errno = EINTR;
952
goto mandos_end;
1347
953
}
1348
954
1349
955
const char *out = mandos_protocol_version;
1503
1109
&decrypted_buffer, mc);
1504
1110
if(decrypted_buffer_size >= 0){
1505
1111
1506
clearerr(stdout);
1507
1112
written = 0;
1508
1113
while(written < (size_t) decrypted_buffer_size){
1509
1114
if(quit_now){
1525
1130
}
1526
1131
written += (size_t)ret;
1527
1132
}
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
}
1538
1133
retval = 0;
1539
1134
}
1540
1135
}
1543
1138
1544
1139
mandos_end:
1545
1140
{
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
}
1552
1141
int e = errno;
1553
1142
free(decrypted_buffer);
1554
1143
free(buffer);
1555
1144
if(tcp_sd >= 0){
1556
ret = close(tcp_sd);
1145
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1557
1146
}
1558
1147
if(ret == -1){
1559
1148
if(e == 0){
1571
1160
return retval;
1572
1161
}
1573
1162
1163
__attribute__((nonnull))
1574
1164
static void resolve_callback(AvahiSServiceResolver *r,
1575
1165
AvahiIfIndex interface,
1576
1166
AvahiProtocol proto,
1713
1303
__attribute__((nonnull, warn_unused_result))
1714
1304
bool get_flags(const char *ifname, struct ifreq *ifr){
1715
1305
int ret;
1716
int old_errno;
1306
error_t ret_errno;
1717
1307
1718
1308
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
1309
if(s < 0){
1720
old_errno = errno;
1310
ret_errno = errno;
1721
1311
perror_plus("socket");
1722
errno = old_errno;
1312
errno = ret_errno;
1723
1313
return false;
1724
1314
}
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1315
strcpy(ifr->ifr_name, ifname);
1727
1316
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1728
1317
if(ret == -1){
1729
1318
if(debug){
1730
old_errno = errno;
1319
ret_errno = errno;
1731
1320
perror_plus("ioctl SIOCGIFFLAGS");
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1321
errno = ret_errno;
1738
1322
}
1739
1323
return false;
1740
1324
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1746
1325
return true;
1747
1326
}
1748
1327
1990
1569
}
1991
1570
}
1992
1571
1572
/* Set effective uid to 0, return errno */
1573
__attribute__((warn_unused_result))
1574
error_t raise_privileges(void){
1575
error_t old_errno = errno;
1576
error_t ret_errno = 0;
1577
if(seteuid(0) == -1){
1578
ret_errno = errno;
1579
}
1580
errno = old_errno;
1581
return ret_errno;
1582
}
1583
1584
/* Set effective and real user ID to 0. Return errno. */
1585
__attribute__((warn_unused_result))
1586
error_t raise_privileges_permanently(void){
1587
error_t old_errno = errno;
1588
error_t ret_errno = raise_privileges();
1589
if(ret_errno != 0){
1590
errno = old_errno;
1591
return ret_errno;
1592
}
1593
if(setuid(0) == -1){
1594
ret_errno = errno;
1595
}
1596
errno = old_errno;
1597
return ret_errno;
1598
}
1599
1600
/* Set effective user ID to unprivileged saved user ID */
1601
__attribute__((warn_unused_result))
1602
error_t lower_privileges(void){
1603
error_t old_errno = errno;
1604
error_t ret_errno = 0;
1605
if(seteuid(uid) == -1){
1606
ret_errno = errno;
1607
}
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
/* Lower privileges permanently */
1613
__attribute__((warn_unused_result))
1614
error_t lower_privileges_permanently(void){
1615
error_t old_errno = errno;
1616
error_t ret_errno = 0;
1617
if(setuid(uid) == -1){
1618
ret_errno = errno;
1619
}
1620
errno = old_errno;
1621
return ret_errno;
1622
}
1623
1993
1624
__attribute__((nonnull))
1994
1625
void run_network_hooks(const char *mode, const char *interface,
1995
1626
const float delay){
1996
1627
struct dirent **direntries = NULL;
1997
1628
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| O_CLOEXEC);
1629
hookdir_fd = open(hookdir, O_RDONLY);
2000
1630
if(hookdir_fd == -1){
2001
1631
if(errno == ENOENT){
2002
1632
if(debug){
2009
1639
return;
2010
1640
}
2011
1641
}
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
}
1642
#ifdef __GLIBC__
1643
#if __GLIBC_PREREQ(2, 15)
2017
1644
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
1645
runnable_hook, alphasort);
1646
#else /* not __GLIBC_PREREQ(2, 15) */
1647
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1648
alphasort);
1649
#endif /* not __GLIBC_PREREQ(2, 15) */
1650
#else /* not __GLIBC__ */
1651
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1652
alphasort);
1653
#endif /* not __GLIBC__ */
2019
1654
if(numhooks == -1){
2020
1655
perror_plus("scandir");
2021
close(devnull);
2022
1656
return;
2023
1657
}
2024
1658
struct dirent *direntry;
2025
1659
int ret;
1660
int devnull = open("/dev/null", O_RDONLY);
2026
1661
for(int i = 0; i < numhooks; i++){
2027
1662
direntry = direntries[i];
2028
1663
if(debug){
2052
1687
perror_plus("setgroups");
2053
1688
_exit(EX_NOPERM);
2054
1689
}
1690
ret = dup2(devnull, STDIN_FILENO);
1691
if(ret == -1){
1692
perror_plus("dup2(devnull, STDIN_FILENO)");
1693
_exit(EX_OSERR);
1694
}
1695
ret = close(devnull);
1696
if(ret == -1){
1697
perror_plus("close");
1698
_exit(EX_OSERR);
1699
}
1700
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1701
if(ret == -1){
1702
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1703
_exit(EX_OSERR);
1704
}
2055
1705
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2056
1706
if(ret == -1){
2057
1707
perror_plus("setenv");
2092
1742
_exit(EX_OSERR);
2093
1743
}
2094
1744
}
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
1745
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2098
1746
if(hook_fd == -1){
2099
1747
perror_plus("openat");
2100
1748
_exit(EXIT_FAILURE);
2101
1749
}
2102
if(close(hookdir_fd) == -1){
1750
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2103
1751
perror_plus("close");
2104
1752
_exit(EXIT_FAILURE);
2105
1753
}
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
}
2121
1754
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2122
1755
environ) == -1){
2123
1756
perror_plus("fexecve");
2163
1796
free(direntry);
2164
1797
}
2165
1798
free(direntries);
2166
if(close(hookdir_fd) == -1){
1799
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2167
1800
perror_plus("close");
2168
1801
} else {
2169
1802
hookdir_fd = -1;
2172
1805
}
2173
1806
2174
1807
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
1808
error_t bring_up_interface(const char *const interface,
1809
const float delay){
1810
error_t old_errno = errno;
2178
1811
int ret;
2179
1812
struct ifreq network;
2180
1813
unsigned int if_index = if_nametoindex(interface);
2190
1823
}
2191
1824
2192
1825
if(not interface_is_up(interface)){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
1826
error_t ret_errno = 0, ioctl_errno = 0;
2195
1827
if(not get_flags(interface, &network)){
2196
1828
ret_errno = errno;
2197
1829
fprintf_plus(stderr, "Failed to get flags for interface "
2210
1842
}
2211
1843
2212
1844
if(quit_now){
2213
ret = close(sd);
1845
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2214
1846
if(ret == -1){
2215
1847
perror_plus("close");
2216
1848
}
2266
1898
}
2267
1899
2268
1900
/* Close the socket */
2269
ret = close(sd);
1901
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1902
if(ret == -1){
2271
1903
perror_plus("close");
2272
1904
}
2284
1916
2285
1917
/* Sleep checking until interface is running.
2286
1918
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
1919
for(int i=0; i < delay * 4; i++){
2288
1920
if(interface_is_running(interface)){
2289
1921
break;
2290
1922
}
2300
1932
}
2301
1933
2302
1934
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
1935
error_t take_down_interface(const char *const interface){
1936
error_t old_errno = errno;
2305
1937
struct ifreq network;
2306
1938
unsigned int if_index = if_nametoindex(interface);
2307
1939
if(if_index == 0){
2310
1942
return ENXIO;
2311
1943
}
2312
1944
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1945
error_t ret_errno = 0, ioctl_errno = 0;
2315
1946
if(not get_flags(interface, &network) and debug){
2316
1947
ret_errno = errno;
2317
1948
fprintf_plus(stderr, "Failed to get flags for interface "
2355
1986
}
2356
1987
2357
1988
/* Close the socket */
2358
int ret = close(sd);
1989
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2359
1990
if(ret == -1){
2360
1991
perror_plus("close");
2361
1992
}
2377
2008
2378
2009
int main(int argc, char *argv[]){
2379
2010
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 };
2011
.priority = "SECURE256:!CTYPE-X.509:"
2012
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2013
.interfaces = NULL, .interfaces_size = 0 };
2384
2014
AvahiSServiceBrowser *sb = NULL;
2385
2015
error_t ret_errno;
2386
2016
int ret;
2395
2025
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2396
2026
const char *seckey = PATHDIR "/" SECKEY;
2397
2027
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
2028
char *interfaces_hooks = NULL;
2400
2029
2401
2030
bool gnutls_initialized = false;
2454
2083
.doc = "Bit length of the prime number used in the"
2455
2084
" Diffie-Hellman key exchange",
2456
2085
.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 },
2462
2086
{ .name = "priority", .key = 130,
2463
2087
.arg = "STRING",
2464
2088
.doc = "GnuTLS priority string for the TLS handshake",
2519
2143
}
2520
2144
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2521
2145
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
2525
2146
case 130: /* --priority */
2526
2147
mc.priority = arg;
2527
2148
break;
2567
2188
.args_doc = "",
2568
2189
.doc = "Mandos client -- Get and decrypt"
2569
2190
" passwords from a Mandos server" };
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
2191
ret = argp_parse(&argp, argc, argv,
2192
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2193
switch(ret){
2573
2194
case 0:
2574
2195
break;
2575
2196
case ENOMEM:
2576
2197
default:
2577
errno = ret_errno;
2198
errno = ret;
2578
2199
perror_plus("argp_parse");
2579
2200
exitcode = EX_OSERR;
2580
2201
goto end;
2583
2204
goto end;
2584
2205
}
2585
2206
}
2586
2207
2587
2208
{
2588
2209
/* Work around Debian bug #633582:
2589
<https://bugs.debian.org/633582> */
2210
<http://bugs.debian.org/633582> */
2590
2211
2591
2212
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2213
ret_errno = raise_privileges();
2214
if(ret_errno != 0){
2215
errno = ret_errno;
2595
2216
perror_plus("Failed to raise privileges");
2596
2217
} else {
2597
2218
struct stat st;
2613
2234
}
2614
2235
}
2615
2236
}
2616
close(seckey_fd);
2237
TEMP_FAILURE_RETRY(close(seckey_fd));
2617
2238
}
2618
2239
}
2619
2240
2620
2241
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2621
2242
int pubkey_fd = open(pubkey, O_RDONLY);
2622
2243
if(pubkey_fd == -1){
2634
2255
}
2635
2256
}
2636
2257
}
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
2258
TEMP_FAILURE_RETRY(close(pubkey_fd));
2259
}
2260
}
2261
2663
2262
/* Lower privileges */
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2667
2266
perror_plus("Failed to lower privileges");
2668
2267
}
2669
2268
}
2839
2438
errno = bring_up_interface(interface, delay);
2840
2439
if(not interface_was_up){
2841
2440
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2441
perror_plus("Failed to bring up interface");
2844
2442
} else {
2845
2443
errno = argz_add(&interfaces_to_take_down,
2846
2444
&interfaces_to_take_down_size,
2869
2467
goto end;
2870
2468
}
2871
2469
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2470
ret = init_gnutls_global(pubkey, seckey, &mc);
2873
2471
if(ret == -1){
2874
2472
fprintf_plus(stderr, "init_gnutls_global failed\n");
2875
2473
exitcode = EX_UNAVAILABLE;
2997
2595
2998
2596
/* Allocate a new server */
2999
2597
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
2598
&config, NULL, NULL, &ret_errno);
3001
2599
3002
2600
/* Free the Avahi configuration data */
3003
2601
avahi_server_config_free(&config);
3006
2604
/* Check if creating the Avahi server object succeeded */
3007
2605
if(mc.server == NULL){
3008
2606
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3009
avahi_strerror(ret));
2607
avahi_strerror(ret_errno));
3010
2608
exitcode = EX_UNAVAILABLE;
3011
2609
goto end;
3012
2610
}
3047
2645
end:
3048
2646
3049
2647
if(debug){
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
}
2648
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3057
2649
}
3058
2650
3059
2651
/* Cleanup things */
3070
2662
3071
2663
if(gnutls_initialized){
3072
2664
gnutls_certificate_free_credentials(mc.cred);
2665
gnutls_global_deinit();
3073
2666
gnutls_dh_params_deinit(mc.dh_params);
3074
2667
}
3075
2668
3098
2691
3099
2692
/* Re-raise privileges */
3100
2693
{
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
2694
ret_errno = raise_privileges();
2695
if(ret_errno != 0){
2696
errno = ret_errno;
3104
2697
perror_plus("Failed to raise privileges");
3105
2698
} else {
3106
2699
3111
2704
/* Take down the network interfaces which were brought up */
3112
2705
{
3113
2706
char *interface = NULL;
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;
2707
while((interface=argz_next(interfaces_to_take_down,
2708
interfaces_to_take_down_size,
2709
interface))){
2710
ret_errno = take_down_interface(interface);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
3120
2713
perror_plus("Failed to take down interface");
3121
2714
}
3122
2715
}
3127
2720
}
3128
2721
}
3129
2722
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
2723
ret_errno = lower_privileges_permanently();
2724
if(ret_errno != 0){
2725
errno = ret_errno;
3133
2726
perror_plus("Failed to lower privileges permanently");
3134
2727
}
3135
2728
}
3137
2730
free(interfaces_to_take_down);
3138
2731
free(interfaces_hooks);
3139
2732
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
3194
2733
/* Removes the GPGME temp directory and all files inside */
3195
2734
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
2735
struct dirent **direntries = NULL;
2736
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2737
O_NOFOLLOW));
2738
if(tempdir_fd == -1){
2739
perror_plus("open");
2740
} else {
2741
#ifdef __GLIBC__
2742
#if __GLIBC_PREREQ(2, 15)
2743
int numentries = scandirat(tempdir_fd, ".", &direntries,
2744
notdotentries, alphasort);
2745
#else /* not __GLIBC_PREREQ(2, 15) */
2746
int numentries = scandir(tempdir, &direntries, notdotentries,
2747
alphasort);
2748
#endif /* not __GLIBC_PREREQ(2, 15) */
2749
#else /* not __GLIBC__ */
2750
int numentries = scandir(tempdir, &direntries, notdotentries,
2751
alphasort);
2752
#endif /* not __GLIBC__ */
2753
if(numentries >= 0){
2754
for(int i = 0; i < numentries; i++){
2755
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2756
if(ret == -1){
2757
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2758
" \"%s\", 0): %s\n", tempdir,
2759
direntries[i]->d_name, strerror(errno));
2760
}
2761
free(direntries[i]);
2762
}
2763
2764
/* need to clean even if 0 because man page doesn't specify */
2765
free(direntries);
2766
if(numentries == -1){
2767
perror_plus("scandir");
2768
}
2769
ret = rmdir(tempdir);
2770
if(ret == -1 and errno != ENOENT){
2771
perror_plus("rmdir");
2772
}
2773
}
2774
TEMP_FAILURE_RETRY(close(tempdir_fd));
2775
}
3197
2776
}
3198
2777
3199
2778
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0