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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:55:24 UTC
- Revision ID: teddy@recompile.se-20140614025524-k03150tjp4t89w1d
plugin-runner: Restore resources correctly if fork() fails.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
240
234
.af = af };
241
235
if(new_server->ip == NULL){
242
236
perror_plus("strdup");
243
free(new_server);
244
237
return false;
245
238
}
246
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
240
if(ret == -1){
248
241
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
242
return false;
259
243
}
260
244
/* Special case of first server */
310
294
gpgme_strsource(rc), gpgme_strerror(rc));
311
295
return false;
312
296
}
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
297
389
ret = close(fd);
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
299
if(ret == -1){
391
300
perror_plus("close");
392
301
}
431
340
/* Create new GPGME "context" */
432
341
rc = gpgme_new(&(mc->ctx));
433
342
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
436
346
return false;
437
347
}
438
348
474
384
/* Create new empty GPGME data buffer for the plaintext */
475
385
rc = gpgme_data_new(&dh_plain);
476
386
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
478
389
gpgme_strsource(rc), gpgme_strerror(rc));
479
390
gpgme_data_release(dh_crypto);
480
391
return -1;
493
404
if(result == NULL){
494
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
495
406
} 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");
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);
502
411
if(result->file_name != NULL){
503
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
504
413
}
574
483
return plaintext_length;
575
484
}
576
485
577
__attribute__((warn_unused_result, const))
578
static const char *safe_string(const char *str){
579
if(str == NULL)
580
return "(unknown)";
581
return str;
582
}
583
584
486
__attribute__((warn_unused_result))
585
487
static const char *safer_gnutls_strerror(int value){
586
488
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
588
492
}
589
493
590
494
/* GnuTLS log function callback */
594
498
fprintf_plus(stderr, "GnuTLS: %s", string);
595
499
}
596
500
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
501
__attribute__((nonnull, warn_unused_result))
598
502
static int init_gnutls_global(const char *pubkeyfilename,
599
503
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
504
mandos_context *mc){
602
505
int ret;
603
unsigned int uret;
604
506
605
507
if(debug){
606
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
607
509
}
608
510
511
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
515
return -1;
516
}
517
609
518
if(debug){
610
519
/* "Use a log level over 10 to enable all debugging options."
611
520
* - GnuTLS manual
619
528
if(ret != GNUTLS_E_SUCCESS){
620
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
622
532
return -1;
623
533
}
624
534
649
559
safer_gnutls_strerror(ret));
650
560
goto globalfail;
651
561
}
652
/* If a Diffie-Hellman parameters file was given, try to use it */
653
if(dhparamsfilename != NULL){
654
gnutls_datum_t params = { .data = NULL, .size = 0 };
655
do {
656
int dhpfile = open(dhparamsfilename, O_RDONLY);
657
if(dhpfile == -1){
658
perror_plus("open");
659
dhparamsfilename = NULL;
660
break;
661
}
662
size_t params_capacity = 0;
663
while(true){
664
params_capacity = incbuffer((char **)¶ms.data,
665
(size_t)params.size,
666
(size_t)params_capacity);
667
if(params_capacity == 0){
668
perror_plus("incbuffer");
669
free(params.data);
670
params.data = NULL;
671
dhparamsfilename = NULL;
672
break;
673
}
674
ssize_t bytes_read = read(dhpfile,
675
params.data + params.size,
676
BUFFER_SIZE);
677
/* EOF */
678
if(bytes_read == 0){
679
break;
680
}
681
/* check bytes_read for failure */
682
if(bytes_read < 0){
683
perror_plus("read");
684
free(params.data);
685
params.data = NULL;
686
dhparamsfilename = NULL;
687
break;
688
}
689
params.size += (unsigned int)bytes_read;
690
}
691
ret = close(dhpfile);
692
if(ret == -1){
693
perror_plus("close");
694
}
695
if(params.data == NULL){
696
dhparamsfilename = NULL;
697
}
698
if(dhparamsfilename == NULL){
699
break;
700
}
701
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
702
GNUTLS_X509_FMT_PEM);
703
if(ret != GNUTLS_E_SUCCESS){
704
fprintf_plus(stderr, "Failed to parse DH parameters in file"
705
" \"%s\": %s\n", dhparamsfilename,
706
safer_gnutls_strerror(ret));
707
dhparamsfilename = NULL;
708
}
709
free(params.data);
710
} while(false);
711
}
712
if(dhparamsfilename == NULL){
713
if(mc->dh_bits == 0){
714
/* Find out the optimal number of DH bits */
715
/* Try to read the private key file */
716
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
717
do {
718
int secfile = open(seckeyfilename, O_RDONLY);
719
if(secfile == -1){
720
perror_plus("open");
721
break;
722
}
723
size_t buffer_capacity = 0;
724
while(true){
725
buffer_capacity = incbuffer((char **)&buffer.data,
726
(size_t)buffer.size,
727
(size_t)buffer_capacity);
728
if(buffer_capacity == 0){
729
perror_plus("incbuffer");
730
free(buffer.data);
731
buffer.data = NULL;
732
break;
733
}
734
ssize_t bytes_read = read(secfile,
735
buffer.data + buffer.size,
736
BUFFER_SIZE);
737
/* EOF */
738
if(bytes_read == 0){
739
break;
740
}
741
/* check bytes_read for failure */
742
if(bytes_read < 0){
743
perror_plus("read");
744
free(buffer.data);
745
buffer.data = NULL;
746
break;
747
}
748
buffer.size += (unsigned int)bytes_read;
749
}
750
close(secfile);
751
} while(false);
752
/* If successful, use buffer to parse private key */
753
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
754
if(buffer.data != NULL){
755
{
756
gnutls_openpgp_privkey_t privkey = NULL;
757
ret = gnutls_openpgp_privkey_init(&privkey);
758
if(ret != GNUTLS_E_SUCCESS){
759
fprintf_plus(stderr, "Error initializing OpenPGP key"
760
" structure: %s",
761
safer_gnutls_strerror(ret));
762
free(buffer.data);
763
buffer.data = NULL;
764
} else {
765
ret = gnutls_openpgp_privkey_import
766
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
769
safer_gnutls_strerror(ret));
770
privkey = NULL;
771
}
772
free(buffer.data);
773
buffer.data = NULL;
774
if(privkey != NULL){
775
/* Use private key to suggest an appropriate
776
sec_param */
777
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
778
gnutls_openpgp_privkey_deinit(privkey);
779
if(debug){
780
fprintf_plus(stderr, "This OpenPGP key implies using"
781
" a GnuTLS security parameter \"%s\".\n",
782
safe_string(gnutls_sec_param_get_name
783
(sec_param)));
784
}
785
}
786
}
787
}
788
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
789
/* Err on the side of caution */
790
sec_param = GNUTLS_SEC_PARAM_ULTRA;
791
if(debug){
792
fprintf_plus(stderr, "Falling back to security parameter"
793
" \"%s\"\n",
794
safe_string(gnutls_sec_param_get_name
795
(sec_param)));
796
}
797
}
798
}
799
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
if(uret != 0){
801
mc->dh_bits = uret;
802
if(debug){
803
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
804
" implies %u DH bits; using that.\n",
805
safe_string(gnutls_sec_param_get_name
806
(sec_param)),
807
mc->dh_bits);
808
}
809
} else {
810
fprintf_plus(stderr, "Failed to get implied number of DH"
811
" bits for security parameter \"%s\"): %s\n",
812
safe_string(gnutls_sec_param_get_name
813
(sec_param)),
814
safer_gnutls_strerror(ret));
815
goto globalfail;
816
}
817
} else if(debug){
818
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
819
mc->dh_bits);
820
}
821
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
822
if(ret != GNUTLS_E_SUCCESS){
823
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
824
" bits): %s\n", mc->dh_bits,
825
safer_gnutls_strerror(ret));
826
goto globalfail;
827
}
828
}
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
829
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
830
570
831
571
return 0;
833
573
globalfail:
834
574
835
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
836
577
gnutls_dh_params_deinit(mc->dh_params);
837
578
return -1;
838
579
}
890
631
/* ignore client certificate if any. */
891
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
892
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
893
636
return 0;
894
637
}
895
638
897
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
898
641
__attribute__((unused)) const char *txt){}
899
642
900
/* Set effective uid to 0, return errno */
901
__attribute__((warn_unused_result))
902
int raise_privileges(void){
903
int old_errno = errno;
904
int ret = 0;
905
if(seteuid(0) == -1){
906
ret = errno;
907
}
908
errno = old_errno;
909
return ret;
910
}
911
912
/* Set effective and real user ID to 0. Return errno. */
913
__attribute__((warn_unused_result))
914
int raise_privileges_permanently(void){
915
int old_errno = errno;
916
int ret = raise_privileges();
917
if(ret != 0){
918
errno = old_errno;
919
return ret;
920
}
921
if(setuid(0) == -1){
922
ret = errno;
923
}
924
errno = old_errno;
925
return ret;
926
}
927
928
/* Set effective user ID to unprivileged saved user ID */
929
__attribute__((warn_unused_result))
930
int lower_privileges(void){
931
int old_errno = errno;
932
int ret = 0;
933
if(seteuid(uid) == -1){
934
ret = errno;
935
}
936
errno = old_errno;
937
return ret;
938
}
939
940
/* Lower privileges permanently */
941
__attribute__((warn_unused_result))
942
int lower_privileges_permanently(void){
943
int old_errno = errno;
944
int ret = 0;
945
if(setuid(uid) == -1){
946
ret = errno;
947
}
948
errno = old_errno;
949
return ret;
950
}
951
952
/* Helper function to add_local_route() and delete_local_route() */
953
__attribute__((nonnull, warn_unused_result))
954
static bool add_delete_local_route(const bool add,
955
const char *address,
956
AvahiIfIndex if_index){
957
int ret;
958
char helper[] = "mandos-client-iprouteadddel";
959
char add_arg[] = "add";
960
char delete_arg[] = "delete";
961
char debug_flag[] = "--debug";
962
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
963
if(pluginhelperdir == NULL){
964
if(debug){
965
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
966
" variable not set; cannot run helper\n");
967
}
968
return false;
969
}
970
971
char interface[IF_NAMESIZE];
972
if(if_indextoname((unsigned int)if_index, interface) == NULL){
973
perror_plus("if_indextoname");
974
return false;
975
}
976
977
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
978
if(devnull == -1){
979
perror_plus("open(\"/dev/null\", O_RDONLY)");
980
return false;
981
}
982
pid_t pid = fork();
983
if(pid == 0){
984
/* Child */
985
/* Raise privileges */
986
errno = raise_privileges_permanently();
987
if(errno != 0){
988
perror_plus("Failed to raise privileges");
989
/* _exit(EX_NOPERM); */
990
} else {
991
/* Set group */
992
errno = 0;
993
ret = setgid(0);
994
if(ret == -1){
995
perror_plus("setgid");
996
_exit(EX_NOPERM);
997
}
998
/* Reset supplementary groups */
999
errno = 0;
1000
ret = setgroups(0, NULL);
1001
if(ret == -1){
1002
perror_plus("setgroups");
1003
_exit(EX_NOPERM);
1004
}
1005
}
1006
ret = dup2(devnull, STDIN_FILENO);
1007
if(ret == -1){
1008
perror_plus("dup2(devnull, STDIN_FILENO)");
1009
_exit(EX_OSERR);
1010
}
1011
ret = close(devnull);
1012
if(ret == -1){
1013
perror_plus("close");
1014
_exit(EX_OSERR);
1015
}
1016
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1017
if(ret == -1){
1018
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1019
_exit(EX_OSERR);
1020
}
1021
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1022
O_RDONLY
1023
| O_DIRECTORY
1024
| O_PATH
1025
| O_CLOEXEC));
1026
if(helperdir_fd == -1){
1027
perror_plus("open");
1028
_exit(EX_UNAVAILABLE);
1029
}
1030
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1031
helper, O_RDONLY));
1032
if(helper_fd == -1){
1033
perror_plus("openat");
1034
close(helperdir_fd);
1035
_exit(EX_UNAVAILABLE);
1036
}
1037
close(helperdir_fd);
1038
#ifdef __GNUC__
1039
#pragma GCC diagnostic push
1040
#pragma GCC diagnostic ignored "-Wcast-qual"
1041
#endif
1042
if(fexecve(helper_fd, (char *const [])
1043
{ helper, add ? add_arg : delete_arg, (char *)address,
1044
interface, debug ? debug_flag : NULL, NULL },
1045
environ) == -1){
1046
#ifdef __GNUC__
1047
#pragma GCC diagnostic pop
1048
#endif
1049
perror_plus("fexecve");
1050
_exit(EXIT_FAILURE);
1051
}
1052
}
1053
if(pid == -1){
1054
perror_plus("fork");
1055
return false;
1056
}
1057
int status;
1058
pid_t pret = -1;
1059
errno = 0;
1060
do {
1061
pret = waitpid(pid, &status, 0);
1062
if(pret == -1 and errno == EINTR and quit_now){
1063
int errno_raising = 0;
1064
if((errno = raise_privileges()) != 0){
1065
errno_raising = errno;
1066
perror_plus("Failed to raise privileges in order to"
1067
" kill helper program");
1068
}
1069
if(kill(pid, SIGTERM) == -1){
1070
perror_plus("kill");
1071
}
1072
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1073
perror_plus("Failed to lower privileges after killing"
1074
" helper program");
1075
}
1076
return false;
1077
}
1078
} while(pret == -1 and errno == EINTR);
1079
if(pret == -1){
1080
perror_plus("waitpid");
1081
return false;
1082
}
1083
if(WIFEXITED(status)){
1084
if(WEXITSTATUS(status) != 0){
1085
fprintf_plus(stderr, "Error: iprouteadddel exited"
1086
" with status %d\n", WEXITSTATUS(status));
1087
return false;
1088
}
1089
return true;
1090
}
1091
if(WIFSIGNALED(status)){
1092
fprintf_plus(stderr, "Error: iprouteadddel died by"
1093
" signal %d\n", WTERMSIG(status));
1094
return false;
1095
}
1096
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
return false;
1098
}
1099
1100
__attribute__((nonnull, warn_unused_result))
1101
static bool add_local_route(const char *address,
1102
AvahiIfIndex if_index){
1103
if(debug){
1104
fprintf_plus(stderr, "Adding route to %s\n", address);
1105
}
1106
return add_delete_local_route(true, address, if_index);
1107
}
1108
1109
__attribute__((nonnull, warn_unused_result))
1110
static bool delete_local_route(const char *address,
1111
AvahiIfIndex if_index){
1112
if(debug){
1113
fprintf_plus(stderr, "Removing route to %s\n", address);
1114
}
1115
return add_delete_local_route(false, address, if_index);
1116
}
1117
1118
643
/* Called when a Mandos server is found */
1119
644
__attribute__((nonnull, warn_unused_result))
1120
645
static int start_mandos_communication(const char *ip, in_port_t port,
1131
656
int retval = -1;
1132
657
gnutls_session_t session;
1133
658
int pf; /* Protocol family */
1134
bool route_added = false;
1135
659
1136
660
errno = 0;
1137
661
1159
683
bool match = false;
1160
684
{
1161
685
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1165
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
689
match = true;
1167
690
break;
1196
719
PRIuMAX "\n", ip, (uintmax_t)port);
1197
720
}
1198
721
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1200
723
if(tcp_sd < 0){
1201
724
int e = errno;
1202
725
perror_plus("socket");
1209
732
goto mandos_end;
1210
733
}
1211
734
735
memset(&to, 0, sizeof(to));
1212
736
if(af == AF_INET6){
1213
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1214
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1215
ret = inet_pton(af, ip, &to6->sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1216
739
} else { /* IPv4 */
1217
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1218
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1219
ret = inet_pton(af, ip, &to4->sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1220
742
}
1221
743
if(ret < 0 ){
1222
744
int e = errno;
1292
814
goto mandos_end;
1293
815
}
1294
816
1295
while(true){
1296
if(af == AF_INET6){
1297
ret = connect(tcp_sd, (struct sockaddr *)&to,
1298
sizeof(struct sockaddr_in6));
1299
} else {
1300
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1301
sizeof(struct sockaddr_in));
1302
}
1303
if(ret < 0){
1304
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1305
and if_index != AVAHI_IF_UNSPEC
1306
and connect_to == NULL
1307
and not route_added and
1308
((af == AF_INET6 and not
1309
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1310
&to)->sin6_addr)))
1311
or (af == AF_INET and
1312
/* Not a a IPv4LL address */
1313
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1314
& 0xFFFF0000L) != 0xA9FE0000L))){
1315
/* Work around Avahi bug - Avahi does not announce link-local
1316
addresses if it has a global address, so local hosts with
1317
*only* a link-local address (e.g. Mandos clients) cannot
1318
connect to a Mandos server announced by Avahi on a server
1319
host with a global address. Work around this by retrying
1320
with an explicit route added with the server's address.
1321
1322
Avahi bug reference:
1323
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1324
https://bugs.debian.org/587961
1325
*/
1326
if(debug){
1327
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
" direct route\n");
1329
}
1330
int e = errno;
1331
route_added = add_local_route(ip, if_index);
1332
if(route_added){
1333
continue;
1334
}
1335
errno = e;
1336
}
1337
if(errno != ECONNREFUSED or debug){
1338
int e = errno;
1339
perror_plus("connect");
1340
errno = e;
1341
}
1342
goto mandos_end;
1343
}
1344
1345
if(quit_now){
1346
errno = EINTR;
1347
goto mandos_end;
1348
}
1349
break;
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1350
836
}
1351
837
1352
838
const char *out = mandos_protocol_version;
1506
992
&decrypted_buffer, mc);
1507
993
if(decrypted_buffer_size >= 0){
1508
994
1509
clearerr(stdout);
1510
995
written = 0;
1511
996
while(written < (size_t) decrypted_buffer_size){
1512
997
if(quit_now){
1528
1013
}
1529
1014
written += (size_t)ret;
1530
1015
}
1531
ret = fflush(stdout);
1532
if(ret != 0){
1533
int e = errno;
1534
if(debug){
1535
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1536
strerror(errno));
1537
}
1538
errno = e;
1539
goto mandos_end;
1540
}
1541
1016
retval = 0;
1542
1017
}
1543
1018
}
1546
1021
1547
1022
mandos_end:
1548
1023
{
1549
if(route_added){
1550
if(not delete_local_route(ip, if_index)){
1551
fprintf_plus(stderr, "Failed to delete local route to %s on"
1552
" interface %d", ip, if_index);
1553
}
1554
}
1555
1024
int e = errno;
1556
1025
free(decrypted_buffer);
1557
1026
free(buffer);
1558
1027
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1560
1029
}
1561
1030
if(ret == -1){
1562
1031
if(e == 0){
1574
1043
return retval;
1575
1044
}
1576
1045
1046
__attribute__((nonnull))
1577
1047
static void resolve_callback(AvahiSServiceResolver *r,
1578
1048
AvahiIfIndex interface,
1579
1049
AvahiProtocol proto,
1596
1066
timed out */
1597
1067
1598
1068
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1600
1069
return;
1601
1070
}
1602
1071
1716
1185
__attribute__((nonnull, warn_unused_result))
1717
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
1187
int ret;
1719
int old_errno;
1188
error_t ret_errno;
1720
1189
1721
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
1191
if(s < 0){
1723
old_errno = errno;
1192
ret_errno = errno;
1724
1193
perror_plus("socket");
1725
errno = old_errno;
1194
errno = ret_errno;
1726
1195
return false;
1727
1196
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1730
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
1199
if(ret == -1){
1732
1200
if(debug){
1733
old_errno = errno;
1201
ret_errno = errno;
1734
1202
perror_plus("ioctl SIOCGIFFLAGS");
1735
errno = old_errno;
1736
}
1737
if((close(s) == -1) and debug){
1738
old_errno = errno;
1739
perror_plus("close");
1740
errno = old_errno;
1203
errno = ret_errno;
1741
1204
}
1742
1205
return false;
1743
1206
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
1207
return true;
1750
1208
}
1751
1209
1993
1451
}
1994
1452
}
1995
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1996
1510
__attribute__((nonnull))
1997
1511
void run_network_hooks(const char *mode, const char *interface,
1998
1512
const float delay){
1999
struct dirent **direntries = NULL;
1513
struct dirent **direntries;
2000
1514
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
1515
hookdir_fd = open(hookdir, O_RDONLY);
2003
1516
if(hookdir_fd == -1){
2004
1517
if(errno == ENOENT){
2005
1518
if(debug){
2012
1525
return;
2013
1526
}
2014
1527
}
2015
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2016
if(devnull == -1){
2017
perror_plus("open(\"/dev/null\", O_RDONLY)");
2018
return;
2019
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
2020
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
2022
1540
if(numhooks == -1){
2023
1541
perror_plus("scandir");
2024
close(devnull);
2025
1542
return;
2026
1543
}
2027
1544
struct dirent *direntry;
2028
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
2029
1547
for(int i = 0; i < numhooks; i++){
2030
1548
direntry = direntries[i];
2031
1549
if(debug){
2036
1554
if(hook_pid == 0){
2037
1555
/* Child */
2038
1556
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
1557
if(raise_privileges_permanently() != 0){
2041
1558
perror_plus("Failed to raise privileges");
2042
1559
_exit(EX_NOPERM);
2043
1560
}
2055
1572
perror_plus("setgroups");
2056
1573
_exit(EX_NOPERM);
2057
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
2058
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
1591
if(ret == -1){
2060
1592
perror_plus("setenv");
2095
1627
_exit(EX_OSERR);
2096
1628
}
2097
1629
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2101
1631
if(hook_fd == -1){
2102
1632
perror_plus("openat");
2103
1633
_exit(EXIT_FAILURE);
2104
1634
}
2105
if(close(hookdir_fd) == -1){
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2106
1636
perror_plus("close");
2107
1637
_exit(EXIT_FAILURE);
2108
1638
}
2109
ret = dup2(devnull, STDIN_FILENO);
2110
if(ret == -1){
2111
perror_plus("dup2(devnull, STDIN_FILENO)");
2112
_exit(EX_OSERR);
2113
}
2114
ret = close(devnull);
2115
if(ret == -1){
2116
perror_plus("close");
2117
_exit(EX_OSERR);
2118
}
2119
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2120
if(ret == -1){
2121
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2122
_exit(EX_OSERR);
2123
}
2124
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
1640
environ) == -1){
2126
1641
perror_plus("fexecve");
2127
1642
_exit(EXIT_FAILURE);
2128
1643
}
2129
1644
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
1645
int status;
2136
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
1647
perror_plus("waitpid");
2138
free(direntry);
2139
1648
continue;
2140
1649
}
2141
1650
if(WIFEXITED(status)){
2143
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
1653
" with status %d\n", direntry->d_name,
2145
1654
WEXITSTATUS(status));
2146
free(direntry);
2147
1655
continue;
2148
1656
}
2149
1657
} else if(WIFSIGNALED(status)){
2150
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
1659
" signal %d\n", direntry->d_name,
2152
1660
WTERMSIG(status));
2153
free(direntry);
2154
1661
continue;
2155
1662
} else {
2156
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
1664
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
1665
continue;
2160
1666
}
2161
1667
}
2163
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
1670
direntry->d_name);
2165
1671
}
2166
free(direntry);
2167
1672
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2170
1674
perror_plus("close");
2171
1675
} else {
2172
1676
hookdir_fd = -1;
2175
1679
}
2176
1680
2177
1681
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
2181
1685
int ret;
2182
1686
struct ifreq network;
2183
1687
unsigned int if_index = if_nametoindex(interface);
2193
1697
}
2194
1698
2195
1699
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
1700
error_t ret_errno = 0, ioctl_errno = 0;
2198
1701
if(not get_flags(interface, &network)){
2199
1702
ret_errno = errno;
2200
1703
fprintf_plus(stderr, "Failed to get flags for interface "
2213
1716
}
2214
1717
2215
1718
if(quit_now){
2216
ret = close(sd);
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2217
1720
if(ret == -1){
2218
1721
perror_plus("close");
2219
1722
}
2229
1732
/* Raise privileges */
2230
1733
ret_errno = raise_privileges();
2231
1734
if(ret_errno != 0){
2232
errno = ret_errno;
2233
1735
perror_plus("Failed to raise privileges");
2234
1736
}
2235
1737
2269
1771
}
2270
1772
2271
1773
/* Close the socket */
2272
ret = close(sd);
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2273
1775
if(ret == -1){
2274
1776
perror_plus("close");
2275
1777
}
2287
1789
2288
1790
/* Sleep checking until interface is running.
2289
1791
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
1792
for(int i=0; i < delay * 4; i++){
2291
1793
if(interface_is_running(interface)){
2292
1794
break;
2293
1795
}
2303
1805
}
2304
1806
2305
1807
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
2308
1810
struct ifreq network;
2309
1811
unsigned int if_index = if_nametoindex(interface);
2310
1812
if(if_index == 0){
2313
1815
return ENXIO;
2314
1816
}
2315
1817
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
1818
error_t ret_errno = 0, ioctl_errno = 0;
2318
1819
if(not get_flags(interface, &network) and debug){
2319
1820
ret_errno = errno;
2320
1821
fprintf_plus(stderr, "Failed to get flags for interface "
2340
1841
/* Raise privileges */
2341
1842
ret_errno = raise_privileges();
2342
1843
if(ret_errno != 0){
2343
errno = ret_errno;
2344
1844
perror_plus("Failed to raise privileges");
2345
1845
}
2346
1846
2358
1858
}
2359
1859
2360
1860
/* Close the socket */
2361
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2362
1862
if(ret == -1){
2363
1863
perror_plus("close");
2364
1864
}
2379
1879
}
2380
1880
2381
1881
int main(int argc, char *argv[]){
2382
mandos_context mc = { .server = NULL, .dh_bits = 0,
2383
.priority = "SECURE256:!CTYPE-X.509"
2384
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2385
.current_server = NULL, .interfaces = NULL,
2386
.interfaces_size = 0 };
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2387
1886
AvahiSServiceBrowser *sb = NULL;
2388
1887
error_t ret_errno;
2389
1888
int ret;
2398
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
1898
const char *seckey = PATHDIR "/" SECKEY;
2400
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
1900
char *interfaces_hooks = NULL;
2403
1901
2404
1902
bool gnutls_initialized = false;
2457
1955
.doc = "Bit length of the prime number used in the"
2458
1956
" Diffie-Hellman key exchange",
2459
1957
.group = 2 },
2460
{ .name = "dh-params", .key = 134,
2461
.arg = "FILE",
2462
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2463
" for the Diffie-Hellman key exchange",
2464
.group = 2 },
2465
1958
{ .name = "priority", .key = 130,
2466
1959
.arg = "STRING",
2467
1960
.doc = "GnuTLS priority string for the TLS handshake",
2522
2015
}
2523
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2524
2017
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
2528
2018
case 130: /* --priority */
2529
2019
mc.priority = arg;
2530
2020
break;
2570
2060
.args_doc = "",
2571
2061
.doc = "Mandos client -- Get and decrypt"
2572
2062
" passwords from a Mandos server" };
2573
ret_errno = argp_parse(&argp, argc, argv,
2574
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2575
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2576
2066
case 0:
2577
2067
break;
2578
2068
case ENOMEM:
2579
2069
default:
2580
errno = ret_errno;
2070
errno = ret;
2581
2071
perror_plus("argp_parse");
2582
2072
exitcode = EX_OSERR;
2583
2073
goto end;
2586
2076
goto end;
2587
2077
}
2588
2078
}
2589
2079
2590
2080
{
2591
2081
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2082
<http://bugs.debian.org/633582> */
2593
2083
2594
2084
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2598
2088
perror_plus("Failed to raise privileges");
2599
2089
} else {
2600
2090
struct stat st;
2616
2106
}
2617
2107
}
2618
2108
}
2619
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2620
2110
}
2621
2111
}
2622
2112
2623
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2625
2115
if(pubkey_fd == -1){
2637
2127
}
2638
2128
}
2639
2129
}
2640
close(pubkey_fd);
2641
}
2642
}
2643
2644
if(dh_params_file != NULL
2645
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2646
int dhparams_fd = open(dh_params_file, O_RDONLY);
2647
if(dhparams_fd == -1){
2648
perror_plus("open");
2649
} else {
2650
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2651
if(ret == -1){
2652
perror_plus("fstat");
2653
} else {
2654
if(S_ISREG(st.st_mode)
2655
and st.st_uid == 0 and st.st_gid == 0){
2656
ret = fchown(dhparams_fd, uid, gid);
2657
if(ret == -1){
2658
perror_plus("fchown");
2659
}
2660
}
2661
}
2662
close(dhparams_fd);
2663
}
2664
}
2665
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2666
2134
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2670
2138
perror_plus("Failed to lower privileges");
2671
2139
}
2672
2140
}
2797
2265
if(ret_errno != 0){
2798
2266
errno = ret_errno;
2799
2267
perror_plus("argz_add");
2800
free(direntries[i]);
2801
2268
continue;
2802
2269
}
2803
2270
if(debug){
2804
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
2272
direntries[i]->d_name);
2806
2273
}
2807
free(direntries[i]);
2808
2274
}
2809
2275
free(direntries);
2810
2276
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2277
free(direntries);
2814
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2815
2279
exitcode = EXIT_FAILURE;
2816
2280
goto end;
2842
2306
errno = bring_up_interface(interface, delay);
2843
2307
if(not interface_was_up){
2844
2308
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2309
perror_plus("Failed to bring up interface");
2847
2310
} else {
2848
2311
errno = argz_add(&interfaces_to_take_down,
2849
2312
&interfaces_to_take_down_size,
2872
2335
goto end;
2873
2336
}
2874
2337
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2876
2339
if(ret == -1){
2877
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2878
2341
exitcode = EX_UNAVAILABLE;
3000
2463
3001
2464
/* Allocate a new server */
3002
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
2466
&config, NULL, NULL, &ret_errno);
3004
2467
3005
2468
/* Free the Avahi configuration data */
3006
2469
avahi_server_config_free(&config);
3009
2472
/* Check if creating the Avahi server object succeeded */
3010
2473
if(mc.server == NULL){
3011
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
2475
avahi_strerror(ret_errno));
3013
2476
exitcode = EX_UNAVAILABLE;
3014
2477
goto end;
3015
2478
}
3050
2513
end:
3051
2514
3052
2515
if(debug){
3053
if(signal_received){
3054
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3055
argv[0], signal_received,
3056
strsignal(signal_received));
3057
} else {
3058
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
}
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3060
2517
}
3061
2518
3062
2519
/* Cleanup things */
3073
2530
3074
2531
if(gnutls_initialized){
3075
2532
gnutls_certificate_free_credentials(mc.cred);
2533
gnutls_global_deinit();
3076
2534
gnutls_dh_params_deinit(mc.dh_params);
3077
2535
}
3078
2536
3086
2544
mc.current_server->prev->next = NULL;
3087
2545
while(mc.current_server != NULL){
3088
2546
server *next = mc.current_server->next;
3089
#ifdef __GNUC__
3090
#pragma GCC diagnostic push
3091
#pragma GCC diagnostic ignored "-Wcast-qual"
3092
#endif
3093
free((char *)(mc.current_server->ip));
3094
#ifdef __GNUC__
3095
#pragma GCC diagnostic pop
3096
#endif
3097
2547
free(mc.current_server);
3098
2548
mc.current_server = next;
3099
2549
}
3101
2551
3102
2552
/* Re-raise privileges */
3103
2553
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
3107
2556
perror_plus("Failed to raise privileges");
3108
2557
} else {
3109
2558
3114
2563
/* Take down the network interfaces which were brought up */
3115
2564
{
3116
2565
char *interface = NULL;
3117
while((interface = argz_next(interfaces_to_take_down,
3118
interfaces_to_take_down_size,
3119
interface))){
3120
ret = take_down_interface(interface);
3121
if(ret != 0){
3122
errno = ret;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
3123
2572
perror_plus("Failed to take down interface");
3124
2573
}
3125
2574
}
3130
2579
}
3131
2580
}
3132
2581
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
3136
2584
perror_plus("Failed to lower privileges permanently");
3137
2585
}
3138
2586
}
3140
2588
free(interfaces_to_take_down);
3141
2589
free(interfaces_hooks);
3142
2590
3143
void clean_dir_at(int base, const char * const dirname,
3144
uintmax_t level){
3145
struct dirent **direntries = NULL;
3146
int dret;
3147
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3148
O_RDONLY
3149
| O_NOFOLLOW
3150
| O_DIRECTORY
3151
| O_PATH));
3152
if(dir_fd == -1){
3153
perror_plus("open");
3154
return;
3155
}
3156
int numentries = scandirat(dir_fd, ".", &direntries,
3157
notdotentries, alphasort);
3158
if(numentries >= 0){
3159
for(int i = 0; i < numentries; i++){
3160
if(debug){
3161
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3162
dirname, direntries[i]->d_name);
3163
}
3164
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3165
if(dret == -1){
3166
if(errno == EISDIR){
3167
dret = unlinkat(dir_fd, direntries[i]->d_name,
3168
AT_REMOVEDIR);
3169
}
3170
if((dret == -1) and (errno == ENOTEMPTY)
3171
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3172
== 0) and (level == 0)){
3173
/* Recurse only in this special case */
3174
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3175
dret = 0;
3176
}
3177
if((dret == -1) and (errno != ENOENT)){
3178
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3179
direntries[i]->d_name, strerror(errno));
3180
}
3181
}
3182
free(direntries[i]);
3183
}
3184
3185
/* need to clean even if 0 because man page doesn't specify */
3186
free(direntries);
3187
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3188
if(dret == -1 and errno != ENOENT){
3189
perror_plus("rmdir");
3190
}
3191
} else {
3192
perror_plus("scandirat");
3193
}
3194
close(dir_fd);
3195
}
3196
3197
2591
/* Removes the GPGME temp directory and all files inside */
3198
2592
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2630
}
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
2632
}
3200
2633
}
3201
2634
3202
2635
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0