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- Committer: Teddy Hogeborn
- Date: 2014-06-07 20:29:36 UTC
- Revision ID: teddy@recompile.se-20140607202936-crh5fxrdd804oora
Fix typo in code comment.
* debian/mandos.postinst: Fix typo in comment.
* debian/mandos.postinst: Fix typo in comment.
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
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
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() */
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,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
148
141
static const char sys_class_net[] = "/sys/class/net";
149
142
char *connect_to = NULL;
150
143
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
144
uid_t uid = 65534;
153
145
gid_t gid = 65534;
154
146
240
232
.af = af };
241
233
if(new_server->ip == NULL){
242
234
perror_plus("strdup");
243
free(new_server);
244
235
return false;
245
236
}
246
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
238
if(ret == -1){
248
239
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
240
return false;
259
241
}
260
242
/* Special case of first server */
311
293
return false;
312
294
}
313
295
314
ret = close(fd);
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
297
if(ret == -1){
316
298
perror_plus("close");
317
299
}
356
338
/* Create new GPGME "context" */
357
339
rc = gpgme_new(&(mc->ctx));
358
340
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
361
344
return false;
362
345
}
363
346
399
382
/* Create new empty GPGME data buffer for the plaintext */
400
383
rc = gpgme_data_new(&dh_plain);
401
384
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
403
387
gpgme_strsource(rc), gpgme_strerror(rc));
404
388
gpgme_data_release(dh_crypto);
405
389
return -1;
418
402
if(result == NULL){
419
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
420
404
} else {
421
if(result->unsupported_algorithm != NULL) {
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
}
425
fprintf_plus(stderr, "Wrong key usage: %s\n",
426
result->wrong_key_usage ? "Yes" : "No");
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
427
409
if(result->file_name != NULL){
428
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
429
411
}
499
481
return plaintext_length;
500
482
}
501
483
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
484
__attribute__((warn_unused_result))
510
485
static const char *safer_gnutls_strerror(int value){
511
486
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
487
if(ret == NULL)
488
ret = "(unknown)";
489
return ret;
513
490
}
514
491
515
492
/* GnuTLS log function callback */
519
496
fprintf_plus(stderr, "GnuTLS: %s", string);
520
497
}
521
498
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
499
__attribute__((nonnull, warn_unused_result))
523
500
static int init_gnutls_global(const char *pubkeyfilename,
524
501
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
502
mandos_context *mc){
527
503
int ret;
528
unsigned int uret;
529
504
530
505
if(debug){
531
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
532
507
}
533
508
509
ret = gnutls_global_init();
510
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
513
return -1;
514
}
515
534
516
if(debug){
535
517
/* "Use a log level over 10 to enable all debugging options."
536
518
* - GnuTLS manual
544
526
if(ret != GNUTLS_E_SUCCESS){
545
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
528
safer_gnutls_strerror(ret));
529
gnutls_global_deinit();
547
530
return -1;
548
531
}
549
532
574
557
safer_gnutls_strerror(ret));
575
558
goto globalfail;
576
559
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
ret = close(dhpfile);
617
if(ret == -1){
618
perror_plus("close");
619
}
620
if(params.data == NULL){
621
dhparamsfilename = NULL;
622
}
623
if(dhparamsfilename == NULL){
624
break;
625
}
626
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
627
GNUTLS_X509_FMT_PEM);
628
if(ret != GNUTLS_E_SUCCESS){
629
fprintf_plus(stderr, "Failed to parse DH parameters in file"
630
" \"%s\": %s\n", dhparamsfilename,
631
safer_gnutls_strerror(ret));
632
dhparamsfilename = NULL;
633
}
634
free(params.data);
635
} while(false);
636
}
637
if(dhparamsfilename == NULL){
638
if(mc->dh_bits == 0){
639
/* Find out the optimal number of DH bits */
640
/* Try to read the private key file */
641
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
642
do {
643
int secfile = open(seckeyfilename, O_RDONLY);
644
if(secfile == -1){
645
perror_plus("open");
646
break;
647
}
648
size_t buffer_capacity = 0;
649
while(true){
650
buffer_capacity = incbuffer((char **)&buffer.data,
651
(size_t)buffer.size,
652
(size_t)buffer_capacity);
653
if(buffer_capacity == 0){
654
perror_plus("incbuffer");
655
free(buffer.data);
656
buffer.data = NULL;
657
break;
658
}
659
ssize_t bytes_read = read(secfile,
660
buffer.data + buffer.size,
661
BUFFER_SIZE);
662
/* EOF */
663
if(bytes_read == 0){
664
break;
665
}
666
/* check bytes_read for failure */
667
if(bytes_read < 0){
668
perror_plus("read");
669
free(buffer.data);
670
buffer.data = NULL;
671
break;
672
}
673
buffer.size += (unsigned int)bytes_read;
674
}
675
close(secfile);
676
} while(false);
677
/* If successful, use buffer to parse private key */
678
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
679
if(buffer.data != NULL){
680
{
681
gnutls_openpgp_privkey_t privkey = NULL;
682
ret = gnutls_openpgp_privkey_init(&privkey);
683
if(ret != GNUTLS_E_SUCCESS){
684
fprintf_plus(stderr, "Error initializing OpenPGP key"
685
" structure: %s",
686
safer_gnutls_strerror(ret));
687
free(buffer.data);
688
buffer.data = NULL;
689
} else {
690
ret = gnutls_openpgp_privkey_import
691
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
692
if(ret != GNUTLS_E_SUCCESS){
693
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
694
safer_gnutls_strerror(ret));
695
privkey = NULL;
696
}
697
free(buffer.data);
698
buffer.data = NULL;
699
if(privkey != NULL){
700
/* Use private key to suggest an appropriate
701
sec_param */
702
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
703
gnutls_openpgp_privkey_deinit(privkey);
704
if(debug){
705
fprintf_plus(stderr, "This OpenPGP key implies using"
706
" a GnuTLS security parameter \"%s\".\n",
707
safe_string(gnutls_sec_param_get_name
708
(sec_param)));
709
}
710
}
711
}
712
}
713
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
714
/* Err on the side of caution */
715
sec_param = GNUTLS_SEC_PARAM_ULTRA;
716
if(debug){
717
fprintf_plus(stderr, "Falling back to security parameter"
718
" \"%s\"\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)));
721
}
722
}
723
}
724
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
if(uret != 0){
726
mc->dh_bits = uret;
727
if(debug){
728
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
729
" implies %u DH bits; using that.\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
mc->dh_bits);
733
}
734
} else {
735
fprintf_plus(stderr, "Failed to get implied number of DH"
736
" bits for security parameter \"%s\"): %s\n",
737
safe_string(gnutls_sec_param_get_name
738
(sec_param)),
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
} else if(debug){
743
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
744
mc->dh_bits);
745
}
746
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
747
if(ret != GNUTLS_E_SUCCESS){
748
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
749
" bits): %s\n", mc->dh_bits,
750
safer_gnutls_strerror(ret));
751
goto globalfail;
752
}
753
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
561
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
564
goto globalfail;
565
}
566
754
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
755
568
756
569
return 0;
758
571
globalfail:
759
572
760
573
gnutls_certificate_free_credentials(mc->cred);
574
gnutls_global_deinit();
761
575
gnutls_dh_params_deinit(mc->dh_params);
762
576
return -1;
763
577
}
815
629
/* ignore client certificate if any. */
816
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
817
631
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
633
818
634
return 0;
819
635
}
820
636
822
638
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
823
639
__attribute__((unused)) const char *txt){}
824
640
825
/* Set effective uid to 0, return errno */
826
__attribute__((warn_unused_result))
827
int raise_privileges(void){
828
int old_errno = errno;
829
int ret = 0;
830
if(seteuid(0) == -1){
831
ret = errno;
832
}
833
errno = old_errno;
834
return ret;
835
}
836
837
/* Set effective and real user ID to 0. Return errno. */
838
__attribute__((warn_unused_result))
839
int raise_privileges_permanently(void){
840
int old_errno = errno;
841
int ret = raise_privileges();
842
if(ret != 0){
843
errno = old_errno;
844
return ret;
845
}
846
if(setuid(0) == -1){
847
ret = errno;
848
}
849
errno = old_errno;
850
return ret;
851
}
852
853
/* Set effective user ID to unprivileged saved user ID */
854
__attribute__((warn_unused_result))
855
int lower_privileges(void){
856
int old_errno = errno;
857
int ret = 0;
858
if(seteuid(uid) == -1){
859
ret = errno;
860
}
861
errno = old_errno;
862
return ret;
863
}
864
865
/* Lower privileges permanently */
866
__attribute__((warn_unused_result))
867
int lower_privileges_permanently(void){
868
int old_errno = errno;
869
int ret = 0;
870
if(setuid(uid) == -1){
871
ret = errno;
872
}
873
errno = old_errno;
874
return ret;
875
}
876
877
/* Helper function to add_local_route() and delete_local_route() */
878
__attribute__((nonnull, warn_unused_result))
879
static bool add_delete_local_route(const bool add,
880
const char *address,
881
AvahiIfIndex if_index){
882
int ret;
883
char helper[] = "mandos-client-iprouteadddel";
884
char add_arg[] = "add";
885
char delete_arg[] = "delete";
886
char debug_flag[] = "--debug";
887
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
888
if(pluginhelperdir == NULL){
889
if(debug){
890
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
891
" variable not set; cannot run helper\n");
892
}
893
return false;
894
}
895
896
char interface[IF_NAMESIZE];
897
if(if_indextoname((unsigned int)if_index, interface) == NULL){
898
perror_plus("if_indextoname");
899
return false;
900
}
901
902
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
903
if(devnull == -1){
904
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
return false;
906
}
907
pid_t pid = fork();
908
if(pid == 0){
909
/* Child */
910
/* Raise privileges */
911
errno = raise_privileges_permanently();
912
if(errno != 0){
913
perror_plus("Failed to raise privileges");
914
/* _exit(EX_NOPERM); */
915
} else {
916
/* Set group */
917
errno = 0;
918
ret = setgid(0);
919
if(ret == -1){
920
perror_plus("setgid");
921
_exit(EX_NOPERM);
922
}
923
/* Reset supplementary groups */
924
errno = 0;
925
ret = setgroups(0, NULL);
926
if(ret == -1){
927
perror_plus("setgroups");
928
_exit(EX_NOPERM);
929
}
930
}
931
ret = dup2(devnull, STDIN_FILENO);
932
if(ret == -1){
933
perror_plus("dup2(devnull, STDIN_FILENO)");
934
_exit(EX_OSERR);
935
}
936
ret = close(devnull);
937
if(ret == -1){
938
perror_plus("close");
939
_exit(EX_OSERR);
940
}
941
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
942
if(ret == -1){
943
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
_exit(EX_OSERR);
945
}
946
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
O_RDONLY
948
| O_DIRECTORY
949
| O_PATH
950
| O_CLOEXEC));
951
if(helperdir_fd == -1){
952
perror_plus("open");
953
_exit(EX_UNAVAILABLE);
954
}
955
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
helper, O_RDONLY));
957
if(helper_fd == -1){
958
perror_plus("openat");
959
close(helperdir_fd);
960
_exit(EX_UNAVAILABLE);
961
}
962
close(helperdir_fd);
963
#ifdef __GNUC__
964
#pragma GCC diagnostic push
965
#pragma GCC diagnostic ignored "-Wcast-qual"
966
#endif
967
if(fexecve(helper_fd, (char *const [])
968
{ helper, add ? add_arg : delete_arg, (char *)address,
969
interface, debug ? debug_flag : NULL, NULL },
970
environ) == -1){
971
#ifdef __GNUC__
972
#pragma GCC diagnostic pop
973
#endif
974
perror_plus("fexecve");
975
_exit(EXIT_FAILURE);
976
}
977
}
978
if(pid == -1){
979
perror_plus("fork");
980
return false;
981
}
982
int status;
983
pid_t pret = -1;
984
errno = 0;
985
do {
986
pret = waitpid(pid, &status, 0);
987
if(pret == -1 and errno == EINTR and quit_now){
988
int errno_raising = 0;
989
if((errno = raise_privileges()) != 0){
990
errno_raising = errno;
991
perror_plus("Failed to raise privileges in order to"
992
" kill helper program");
993
}
994
if(kill(pid, SIGTERM) == -1){
995
perror_plus("kill");
996
}
997
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
998
perror_plus("Failed to lower privileges after killing"
999
" helper program");
1000
}
1001
return false;
1002
}
1003
} while(pret == -1 and errno == EINTR);
1004
if(pret == -1){
1005
perror_plus("waitpid");
1006
return false;
1007
}
1008
if(WIFEXITED(status)){
1009
if(WEXITSTATUS(status) != 0){
1010
fprintf_plus(stderr, "Error: iprouteadddel exited"
1011
" with status %d\n", WEXITSTATUS(status));
1012
return false;
1013
}
1014
return true;
1015
}
1016
if(WIFSIGNALED(status)){
1017
fprintf_plus(stderr, "Error: iprouteadddel died by"
1018
" signal %d\n", WTERMSIG(status));
1019
return false;
1020
}
1021
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
return false;
1023
}
1024
1025
__attribute__((nonnull, warn_unused_result))
1026
static bool add_local_route(const char *address,
1027
AvahiIfIndex if_index){
1028
if(debug){
1029
fprintf_plus(stderr, "Adding route to %s\n", address);
1030
}
1031
return add_delete_local_route(true, address, if_index);
1032
}
1033
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool delete_local_route(const char *address,
1036
AvahiIfIndex if_index){
1037
if(debug){
1038
fprintf_plus(stderr, "Removing route to %s\n", address);
1039
}
1040
return add_delete_local_route(false, address, if_index);
1041
}
1042
1043
641
/* Called when a Mandos server is found */
1044
642
__attribute__((nonnull, warn_unused_result))
1045
643
static int start_mandos_communication(const char *ip, in_port_t port,
1056
654
int retval = -1;
1057
655
gnutls_session_t session;
1058
656
int pf; /* Protocol family */
1059
bool route_added = false;
1060
657
1061
658
errno = 0;
1062
659
1084
681
bool match = false;
1085
682
{
1086
683
char *interface = NULL;
1087
while((interface = argz_next(mc->interfaces,
1088
mc->interfaces_size,
1089
interface))){
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
1090
686
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
687
match = true;
1092
688
break;
1121
717
PRIuMAX "\n", ip, (uintmax_t)port);
1122
718
}
1123
719
1124
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
1125
721
if(tcp_sd < 0){
1126
722
int e = errno;
1127
723
perror_plus("socket");
1134
730
goto mandos_end;
1135
731
}
1136
732
733
memset(&to, 0, sizeof(to));
1137
734
if(af == AF_INET6){
1138
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1139
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to6->sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1141
737
} else { /* IPv4 */
1142
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1143
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1144
ret = inet_pton(af, ip, &to4->sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1145
740
}
1146
741
if(ret < 0 ){
1147
742
int e = errno;
1217
812
goto mandos_end;
1218
813
}
1219
814
1220
while(true){
1221
if(af == AF_INET6){
1222
ret = connect(tcp_sd, (struct sockaddr *)&to,
1223
sizeof(struct sockaddr_in6));
1224
} else {
1225
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1226
sizeof(struct sockaddr_in));
1227
}
1228
if(ret < 0){
1229
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1230
and if_index != AVAHI_IF_UNSPEC
1231
and connect_to == NULL
1232
and not route_added and
1233
((af == AF_INET6 and not
1234
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1235
&to)->sin6_addr)))
1236
or (af == AF_INET and
1237
/* Not a a IPv4LL address */
1238
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1239
& 0xFFFF0000L) != 0xA9FE0000L))){
1240
/* Work around Avahi bug - Avahi does not announce link-local
1241
addresses if it has a global address, so local hosts with
1242
*only* a link-local address (e.g. Mandos clients) cannot
1243
connect to a Mandos server announced by Avahi on a server
1244
host with a global address. Work around this by retrying
1245
with an explicit route added with the server's address.
1246
1247
Avahi bug reference:
1248
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1249
https://bugs.debian.org/587961
1250
*/
1251
if(debug){
1252
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
" direct route\n");
1254
}
1255
int e = errno;
1256
route_added = add_local_route(ip, if_index);
1257
if(route_added){
1258
continue;
1259
}
1260
errno = e;
1261
}
1262
if(errno != ECONNREFUSED or debug){
1263
int e = errno;
1264
perror_plus("connect");
1265
errno = e;
1266
}
1267
goto mandos_end;
1268
}
1269
1270
if(quit_now){
1271
errno = EINTR;
1272
goto mandos_end;
1273
}
1274
break;
815
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
818
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
821
}
822
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
828
goto mandos_end;
829
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
1275
834
}
1276
835
1277
836
const char *out = mandos_protocol_version;
1431
990
&decrypted_buffer, mc);
1432
991
if(decrypted_buffer_size >= 0){
1433
992
1434
clearerr(stdout);
1435
993
written = 0;
1436
994
while(written < (size_t) decrypted_buffer_size){
1437
995
if(quit_now){
1453
1011
}
1454
1012
written += (size_t)ret;
1455
1013
}
1456
ret = fflush(stdout);
1457
if(ret != 0){
1458
int e = errno;
1459
if(debug){
1460
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1461
strerror(errno));
1462
}
1463
errno = e;
1464
goto mandos_end;
1465
}
1466
1014
retval = 0;
1467
1015
}
1468
1016
}
1471
1019
1472
1020
mandos_end:
1473
1021
{
1474
if(route_added){
1475
if(not delete_local_route(ip, if_index)){
1476
fprintf_plus(stderr, "Failed to delete local route to %s on"
1477
" interface %d", ip, if_index);
1478
}
1479
}
1480
1022
int e = errno;
1481
1023
free(decrypted_buffer);
1482
1024
free(buffer);
1483
1025
if(tcp_sd >= 0){
1484
ret = close(tcp_sd);
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1485
1027
}
1486
1028
if(ret == -1){
1487
1029
if(e == 0){
1499
1041
return retval;
1500
1042
}
1501
1043
1044
__attribute__((nonnull))
1502
1045
static void resolve_callback(AvahiSServiceResolver *r,
1503
1046
AvahiIfIndex interface,
1504
1047
AvahiProtocol proto,
1521
1064
timed out */
1522
1065
1523
1066
if(quit_now){
1524
avahi_s_service_resolver_free(r);
1525
1067
return;
1526
1068
}
1527
1069
1641
1183
__attribute__((nonnull, warn_unused_result))
1642
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1643
1185
int ret;
1644
int old_errno;
1186
error_t ret_errno;
1645
1187
1646
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1647
1189
if(s < 0){
1648
old_errno = errno;
1190
ret_errno = errno;
1649
1191
perror_plus("socket");
1650
errno = old_errno;
1192
errno = ret_errno;
1651
1193
return false;
1652
1194
}
1653
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1654
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1195
strcpy(ifr->ifr_name, ifname);
1655
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1656
1197
if(ret == -1){
1657
1198
if(debug){
1658
old_errno = errno;
1199
ret_errno = errno;
1659
1200
perror_plus("ioctl SIOCGIFFLAGS");
1660
errno = old_errno;
1661
}
1662
if((close(s) == -1) and debug){
1663
old_errno = errno;
1664
perror_plus("close");
1665
errno = old_errno;
1201
errno = ret_errno;
1666
1202
}
1667
1203
return false;
1668
1204
}
1669
if((close(s) == -1) and debug){
1670
old_errno = errno;
1671
perror_plus("close");
1672
errno = old_errno;
1673
}
1674
1205
return true;
1675
1206
}
1676
1207
1814
1345
return 0;
1815
1346
}
1816
1347
1817
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1818
1356
if(ret == -1){
1819
1357
if(debug){
1820
1358
perror_plus("Could not stat hook");
1821
1359
}
1822
1360
return 0;
1823
1361
}
1362
free(fullname);
1824
1363
if(not (S_ISREG(st.st_mode))){
1825
1364
/* Not a regular file */
1826
1365
if(debug){
1918
1457
}
1919
1458
}
1920
1459
1460
/* Set effective uid to 0, return errno */
1461
__attribute__((warn_unused_result))
1462
error_t raise_privileges(void){
1463
error_t old_errno = errno;
1464
error_t ret_errno = 0;
1465
if(seteuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective and real user ID to 0. Return errno. */
1474
__attribute__((warn_unused_result))
1475
error_t raise_privileges_permanently(void){
1476
error_t old_errno = errno;
1477
error_t ret_errno = raise_privileges();
1478
if(ret_errno != 0){
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
if(setuid(0) == -1){
1483
ret_errno = errno;
1484
perror_plus("seteuid");
1485
}
1486
errno = old_errno;
1487
return ret_errno;
1488
}
1489
1490
/* Set effective user ID to unprivileged saved user ID */
1491
__attribute__((warn_unused_result))
1492
error_t lower_privileges(void){
1493
error_t old_errno = errno;
1494
error_t ret_errno = 0;
1495
if(seteuid(uid) == -1){
1496
ret_errno = errno;
1497
perror_plus("seteuid");
1498
}
1499
errno = old_errno;
1500
return ret_errno;
1501
}
1502
1503
/* Lower privileges permanently */
1504
__attribute__((warn_unused_result))
1505
error_t lower_privileges_permanently(void){
1506
error_t old_errno = errno;
1507
error_t ret_errno = 0;
1508
if(setuid(uid) == -1){
1509
ret_errno = errno;
1510
perror_plus("setuid");
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1921
1516
__attribute__((nonnull))
1922
1517
void run_network_hooks(const char *mode, const char *interface,
1923
1518
const float delay){
1924
struct dirent **direntries = NULL;
1925
if(hookdir_fd == -1){
1926
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1927
| O_CLOEXEC);
1928
if(hookdir_fd == -1){
1929
if(errno == ENOENT){
1930
if(debug){
1931
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1932
" found\n", hookdir);
1933
}
1934
} else {
1935
perror_plus("open");
1936
}
1937
return;
1938
}
1939
}
1940
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1941
if(devnull == -1){
1942
perror_plus("open(\"/dev/null\", O_RDONLY)");
1943
return;
1944
}
1945
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1946
runnable_hook, alphasort);
1519
struct dirent **direntries;
1520
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
alphasort);
1947
1522
if(numhooks == -1){
1948
perror_plus("scandir");
1949
close(devnull);
1950
return;
1951
}
1952
struct dirent *direntry;
1953
int ret;
1954
for(int i = 0; i < numhooks; i++){
1955
direntry = direntries[i];
1956
if(debug){
1957
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1958
direntry->d_name);
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("scandir");
1959
1530
}
1960
pid_t hook_pid = fork();
1961
if(hook_pid == 0){
1962
/* Child */
1963
/* Raise privileges */
1964
errno = raise_privileges_permanently();
1965
if(errno != 0){
1966
perror_plus("Failed to raise privileges");
1967
_exit(EX_NOPERM);
1968
}
1969
/* Set group */
1970
errno = 0;
1971
ret = setgid(0);
1972
if(ret == -1){
1973
perror_plus("setgid");
1974
_exit(EX_NOPERM);
1975
}
1976
/* Reset supplementary groups */
1977
errno = 0;
1978
ret = setgroups(0, NULL);
1979
if(ret == -1){
1980
perror_plus("setgroups");
1981
_exit(EX_NOPERM);
1982
}
1983
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
ret = setenv("DEVICE", interface, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("MODE", mode, 1);
1999
if(ret == -1){
2000
perror_plus("setenv");
2001
_exit(EX_OSERR);
2002
}
2003
char *delaystring;
2004
ret = asprintf(&delaystring, "%f", (double)delay);
2005
if(ret == -1){
1531
} else {
1532
struct dirent *direntry;
1533
int ret;
1534
int devnull = open("/dev/null", O_RDONLY);
1535
for(int i = 0; i < numhooks; i++){
1536
direntry = direntries[i];
1537
char *fullname = NULL;
1538
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1539
if(ret < 0){
2006
1540
perror_plus("asprintf");
2007
_exit(EX_OSERR);
2008
}
2009
ret = setenv("DELAY", delaystring, 1);
2010
if(ret == -1){
1541
continue;
1542
}
1543
if(debug){
1544
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1545
direntry->d_name);
1546
}
1547
pid_t hook_pid = fork();
1548
if(hook_pid == 0){
1549
/* Child */
1550
/* Raise privileges */
1551
if(raise_privileges_permanently() != 0){
1552
perror_plus("Failed to raise privileges");
1553
_exit(EX_NOPERM);
1554
}
1555
/* Set group */
1556
errno = 0;
1557
ret = setgid(0);
1558
if(ret == -1){
1559
perror_plus("setgid");
1560
_exit(EX_NOPERM);
1561
}
1562
/* Reset supplementary groups */
1563
errno = 0;
1564
ret = setgroups(0, NULL);
1565
if(ret == -1){
1566
perror_plus("setgroups");
1567
_exit(EX_NOPERM);
1568
}
1569
ret = dup2(devnull, STDIN_FILENO);
1570
if(ret == -1){
1571
perror_plus("dup2(devnull, STDIN_FILENO)");
1572
_exit(EX_OSERR);
1573
}
1574
ret = close(devnull);
1575
if(ret == -1){
1576
perror_plus("close");
1577
_exit(EX_OSERR);
1578
}
1579
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
if(ret == -1){
1581
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1582
_exit(EX_OSERR);
1583
}
1584
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
if(ret == -1){
1586
perror_plus("setenv");
1587
_exit(EX_OSERR);
1588
}
1589
ret = setenv("DEVICE", interface, 1);
1590
if(ret == -1){
1591
perror_plus("setenv");
1592
_exit(EX_OSERR);
1593
}
1594
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1595
if(ret == -1){
1596
perror_plus("setenv");
1597
_exit(EX_OSERR);
1598
}
1599
ret = setenv("MODE", mode, 1);
1600
if(ret == -1){
1601
perror_plus("setenv");
1602
_exit(EX_OSERR);
1603
}
1604
char *delaystring;
1605
ret = asprintf(&delaystring, "%f", (double)delay);
1606
if(ret == -1){
1607
perror_plus("asprintf");
1608
_exit(EX_OSERR);
1609
}
1610
ret = setenv("DELAY", delaystring, 1);
1611
if(ret == -1){
1612
free(delaystring);
1613
perror_plus("setenv");
1614
_exit(EX_OSERR);
1615
}
2011
1616
free(delaystring);
2012
perror_plus("setenv");
2013
_exit(EX_OSERR);
2014
}
2015
free(delaystring);
2016
if(connect_to != NULL){
2017
ret = setenv("CONNECT", connect_to, 1);
2018
if(ret == -1){
2019
perror_plus("setenv");
2020
_exit(EX_OSERR);
2021
}
2022
}
2023
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2024
direntry->d_name,
2025
O_RDONLY));
2026
if(hook_fd == -1){
2027
perror_plus("openat");
2028
_exit(EXIT_FAILURE);
2029
}
2030
if(close(hookdir_fd) == -1){
2031
perror_plus("close");
2032
_exit(EXIT_FAILURE);
2033
}
2034
ret = dup2(devnull, STDIN_FILENO);
2035
if(ret == -1){
2036
perror_plus("dup2(devnull, STDIN_FILENO)");
2037
_exit(EX_OSERR);
2038
}
2039
ret = close(devnull);
2040
if(ret == -1){
2041
perror_plus("close");
2042
_exit(EX_OSERR);
2043
}
2044
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2045
if(ret == -1){
2046
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2047
_exit(EX_OSERR);
2048
}
2049
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2050
environ) == -1){
2051
perror_plus("fexecve");
2052
_exit(EXIT_FAILURE);
2053
}
2054
} else {
2055
if(hook_pid == -1){
2056
perror_plus("fork");
2057
free(direntry);
2058
continue;
2059
}
2060
int status;
2061
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2062
perror_plus("waitpid");
2063
free(direntry);
2064
continue;
2065
}
2066
if(WIFEXITED(status)){
2067
if(WEXITSTATUS(status) != 0){
2068
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2069
" with status %d\n", direntry->d_name,
2070
WEXITSTATUS(status));
2071
free(direntry);
2072
continue;
2073
}
2074
} else if(WIFSIGNALED(status)){
2075
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2076
" signal %d\n", direntry->d_name,
2077
WTERMSIG(status));
2078
free(direntry);
2079
continue;
1617
if(connect_to != NULL){
1618
ret = setenv("CONNECT", connect_to, 1);
1619
if(ret == -1){
1620
perror_plus("setenv");
1621
_exit(EX_OSERR);
1622
}
1623
}
1624
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1625
perror_plus("execl");
1626
_exit(EXIT_FAILURE);
1627
}
2080
1628
} else {
2081
fprintf_plus(stderr, "Warning: network hook \"%s\""
2082
" crashed\n", direntry->d_name);
2083
free(direntry);
2084
continue;
2085
}
2086
}
2087
if(debug){
2088
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2089
direntry->d_name);
2090
}
2091
free(direntry);
2092
}
2093
free(direntries);
2094
if(close(hookdir_fd) == -1){
2095
perror_plus("close");
2096
} else {
2097
hookdir_fd = -1;
2098
}
2099
close(devnull);
1629
int status;
1630
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1631
perror_plus("waitpid");
1632
free(fullname);
1633
continue;
1634
}
1635
if(WIFEXITED(status)){
1636
if(WEXITSTATUS(status) != 0){
1637
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1638
" with status %d\n", direntry->d_name,
1639
WEXITSTATUS(status));
1640
free(fullname);
1641
continue;
1642
}
1643
} else if(WIFSIGNALED(status)){
1644
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1645
" signal %d\n", direntry->d_name,
1646
WTERMSIG(status));
1647
free(fullname);
1648
continue;
1649
} else {
1650
fprintf_plus(stderr, "Warning: network hook \"%s\""
1651
" crashed\n", direntry->d_name);
1652
free(fullname);
1653
continue;
1654
}
1655
}
1656
free(fullname);
1657
if(debug){
1658
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1659
direntry->d_name);
1660
}
1661
}
1662
close(devnull);
1663
}
2100
1664
}
2101
1665
2102
1666
__attribute__((nonnull, warn_unused_result))
2103
int bring_up_interface(const char *const interface,
2104
const float delay){
2105
int old_errno = errno;
1667
error_t bring_up_interface(const char *const interface,
1668
const float delay){
1669
error_t old_errno = errno;
2106
1670
int ret;
2107
1671
struct ifreq network;
2108
1672
unsigned int if_index = if_nametoindex(interface);
2118
1682
}
2119
1683
2120
1684
if(not interface_is_up(interface)){
2121
int ret_errno = 0;
2122
int ioctl_errno = 0;
1685
error_t ret_errno = 0, ioctl_errno = 0;
2123
1686
if(not get_flags(interface, &network)){
2124
1687
ret_errno = errno;
2125
1688
fprintf_plus(stderr, "Failed to get flags for interface "
2138
1701
}
2139
1702
2140
1703
if(quit_now){
2141
ret = close(sd);
1704
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2142
1705
if(ret == -1){
2143
1706
perror_plus("close");
2144
1707
}
2154
1717
/* Raise privileges */
2155
1718
ret_errno = raise_privileges();
2156
1719
if(ret_errno != 0){
2157
errno = ret_errno;
2158
1720
perror_plus("Failed to raise privileges");
2159
1721
}
2160
1722
2194
1756
}
2195
1757
2196
1758
/* Close the socket */
2197
ret = close(sd);
1759
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2198
1760
if(ret == -1){
2199
1761
perror_plus("close");
2200
1762
}
2212
1774
2213
1775
/* Sleep checking until interface is running.
2214
1776
Check every 0.25s, up to total time of delay */
2215
for(int i = 0; i < delay * 4; i++){
1777
for(int i=0; i < delay * 4; i++){
2216
1778
if(interface_is_running(interface)){
2217
1779
break;
2218
1780
}
2228
1790
}
2229
1791
2230
1792
__attribute__((nonnull, warn_unused_result))
2231
int take_down_interface(const char *const interface){
2232
int old_errno = errno;
1793
error_t take_down_interface(const char *const interface){
1794
error_t old_errno = errno;
2233
1795
struct ifreq network;
2234
1796
unsigned int if_index = if_nametoindex(interface);
2235
1797
if(if_index == 0){
2238
1800
return ENXIO;
2239
1801
}
2240
1802
if(interface_is_up(interface)){
2241
int ret_errno = 0;
2242
int ioctl_errno = 0;
1803
error_t ret_errno = 0, ioctl_errno = 0;
2243
1804
if(not get_flags(interface, &network) and debug){
2244
1805
ret_errno = errno;
2245
1806
fprintf_plus(stderr, "Failed to get flags for interface "
2265
1826
/* Raise privileges */
2266
1827
ret_errno = raise_privileges();
2267
1828
if(ret_errno != 0){
2268
errno = ret_errno;
2269
1829
perror_plus("Failed to raise privileges");
2270
1830
}
2271
1831
2283
1843
}
2284
1844
2285
1845
/* Close the socket */
2286
int ret = close(sd);
1846
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2287
1847
if(ret == -1){
2288
1848
perror_plus("close");
2289
1849
}
2304
1864
}
2305
1865
2306
1866
int main(int argc, char *argv[]){
2307
mandos_context mc = { .server = NULL, .dh_bits = 0,
2308
.priority = "SECURE256:!CTYPE-X.509"
2309
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2310
.current_server = NULL, .interfaces = NULL,
2311
.interfaces_size = 0 };
1867
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1868
.priority = "SECURE256:!CTYPE-X.509:"
1869
"+CTYPE-OPENPGP", .current_server = NULL,
1870
.interfaces = NULL, .interfaces_size = 0 };
2312
1871
AvahiSServiceBrowser *sb = NULL;
2313
1872
error_t ret_errno;
2314
1873
int ret;
2323
1882
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2324
1883
const char *seckey = PATHDIR "/" SECKEY;
2325
1884
const char *pubkey = PATHDIR "/" PUBKEY;
2326
const char *dh_params_file = NULL;
2327
1885
char *interfaces_hooks = NULL;
2328
1886
2329
1887
bool gnutls_initialized = false;
2382
1940
.doc = "Bit length of the prime number used in the"
2383
1941
" Diffie-Hellman key exchange",
2384
1942
.group = 2 },
2385
{ .name = "dh-params", .key = 134,
2386
.arg = "FILE",
2387
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2388
" for the Diffie-Hellman key exchange",
2389
.group = 2 },
2390
1943
{ .name = "priority", .key = 130,
2391
1944
.arg = "STRING",
2392
1945
.doc = "GnuTLS priority string for the TLS handshake",
2447
2000
}
2448
2001
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2449
2002
break;
2450
case 134: /* --dh-params */
2451
dh_params_file = arg;
2452
break;
2453
2003
case 130: /* --priority */
2454
2004
mc.priority = arg;
2455
2005
break;
2495
2045
.args_doc = "",
2496
2046
.doc = "Mandos client -- Get and decrypt"
2497
2047
" passwords from a Mandos server" };
2498
ret_errno = argp_parse(&argp, argc, argv,
2499
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2500
switch(ret_errno){
2048
ret = argp_parse(&argp, argc, argv,
2049
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2050
switch(ret){
2501
2051
case 0:
2502
2052
break;
2503
2053
case ENOMEM:
2504
2054
default:
2505
errno = ret_errno;
2055
errno = ret;
2506
2056
perror_plus("argp_parse");
2507
2057
exitcode = EX_OSERR;
2508
2058
goto end;
2511
2061
goto end;
2512
2062
}
2513
2063
}
2514
2064
2515
2065
{
2516
2066
/* Work around Debian bug #633582:
2517
<https://bugs.debian.org/633582> */
2067
<http://bugs.debian.org/633582> */
2518
2068
2519
2069
/* Re-raise privileges */
2520
ret = raise_privileges();
2521
if(ret != 0){
2522
errno = ret;
2070
ret_errno = raise_privileges();
2071
if(ret_errno != 0){
2072
errno = ret_errno;
2523
2073
perror_plus("Failed to raise privileges");
2524
2074
} else {
2525
2075
struct stat st;
2541
2091
}
2542
2092
}
2543
2093
}
2544
close(seckey_fd);
2094
TEMP_FAILURE_RETRY(close(seckey_fd));
2545
2095
}
2546
2096
}
2547
2097
2548
2098
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2549
2099
int pubkey_fd = open(pubkey, O_RDONLY);
2550
2100
if(pubkey_fd == -1){
2562
2112
}
2563
2113
}
2564
2114
}
2565
close(pubkey_fd);
2566
}
2567
}
2568
2569
if(dh_params_file != NULL
2570
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2571
int dhparams_fd = open(dh_params_file, O_RDONLY);
2572
if(dhparams_fd == -1){
2573
perror_plus("open");
2574
} else {
2575
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2576
if(ret == -1){
2577
perror_plus("fstat");
2578
} else {
2579
if(S_ISREG(st.st_mode)
2580
and st.st_uid == 0 and st.st_gid == 0){
2581
ret = fchown(dhparams_fd, uid, gid);
2582
if(ret == -1){
2583
perror_plus("fchown");
2584
}
2585
}
2586
}
2587
close(dhparams_fd);
2588
}
2589
}
2590
2115
TEMP_FAILURE_RETRY(close(pubkey_fd));
2116
}
2117
}
2118
2591
2119
/* Lower privileges */
2592
ret = lower_privileges();
2593
if(ret != 0){
2594
errno = ret;
2120
ret_errno = lower_privileges();
2121
if(ret_errno != 0){
2122
errno = ret_errno;
2595
2123
perror_plus("Failed to lower privileges");
2596
2124
}
2597
2125
}
2710
2238
2711
2239
/* If no interfaces were specified, make a list */
2712
2240
if(mc.interfaces == NULL){
2713
struct dirent **direntries = NULL;
2241
struct dirent **direntries;
2714
2242
/* Look for any good interfaces */
2715
2243
ret = scandir(sys_class_net, &direntries, good_interface,
2716
2244
alphasort);
2722
2250
if(ret_errno != 0){
2723
2251
errno = ret_errno;
2724
2252
perror_plus("argz_add");
2725
free(direntries[i]);
2726
2253
continue;
2727
2254
}
2728
2255
if(debug){
2729
2256
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2730
2257
direntries[i]->d_name);
2731
2258
}
2732
free(direntries[i]);
2733
2259
}
2734
2260
free(direntries);
2735
2261
} else {
2736
if(ret == 0){
2737
free(direntries);
2738
}
2262
free(direntries);
2739
2263
fprintf_plus(stderr, "Could not find a network interface\n");
2740
2264
exitcode = EXIT_FAILURE;
2741
2265
goto end;
2767
2291
errno = bring_up_interface(interface, delay);
2768
2292
if(not interface_was_up){
2769
2293
if(errno != 0){
2770
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2771
" %s\n", interface, strerror(errno));
2294
perror_plus("Failed to bring up interface");
2772
2295
} else {
2773
2296
errno = argz_add(&interfaces_to_take_down,
2774
2297
&interfaces_to_take_down_size,
2797
2320
goto end;
2798
2321
}
2799
2322
2800
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2323
ret = init_gnutls_global(pubkey, seckey, &mc);
2801
2324
if(ret == -1){
2802
2325
fprintf_plus(stderr, "init_gnutls_global failed\n");
2803
2326
exitcode = EX_UNAVAILABLE;
2925
2448
2926
2449
/* Allocate a new server */
2927
2450
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2928
&config, NULL, NULL, &ret);
2451
&config, NULL, NULL, &ret_errno);
2929
2452
2930
2453
/* Free the Avahi configuration data */
2931
2454
avahi_server_config_free(&config);
2934
2457
/* Check if creating the Avahi server object succeeded */
2935
2458
if(mc.server == NULL){
2936
2459
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2937
avahi_strerror(ret));
2460
avahi_strerror(ret_errno));
2938
2461
exitcode = EX_UNAVAILABLE;
2939
2462
goto end;
2940
2463
}
2975
2498
end:
2976
2499
2977
2500
if(debug){
2978
if(signal_received){
2979
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2980
argv[0], signal_received,
2981
strsignal(signal_received));
2982
} else {
2983
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2984
}
2501
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2985
2502
}
2986
2503
2987
2504
/* Cleanup things */
2998
2515
2999
2516
if(gnutls_initialized){
3000
2517
gnutls_certificate_free_credentials(mc.cred);
2518
gnutls_global_deinit();
3001
2519
gnutls_dh_params_deinit(mc.dh_params);
3002
2520
}
3003
2521
3011
2529
mc.current_server->prev->next = NULL;
3012
2530
while(mc.current_server != NULL){
3013
2531
server *next = mc.current_server->next;
3014
#ifdef __GNUC__
3015
#pragma GCC diagnostic push
3016
#pragma GCC diagnostic ignored "-Wcast-qual"
3017
#endif
3018
free((char *)(mc.current_server->ip));
3019
#ifdef __GNUC__
3020
#pragma GCC diagnostic pop
3021
#endif
3022
2532
free(mc.current_server);
3023
2533
mc.current_server = next;
3024
2534
}
3026
2536
3027
2537
/* Re-raise privileges */
3028
2538
{
3029
ret = raise_privileges();
3030
if(ret != 0){
3031
errno = ret;
2539
ret_errno = raise_privileges();
2540
if(ret_errno != 0){
3032
2541
perror_plus("Failed to raise privileges");
3033
2542
} else {
3034
2543
3039
2548
/* Take down the network interfaces which were brought up */
3040
2549
{
3041
2550
char *interface = NULL;
3042
while((interface = argz_next(interfaces_to_take_down,
3043
interfaces_to_take_down_size,
3044
interface))){
3045
ret = take_down_interface(interface);
3046
if(ret != 0){
3047
errno = ret;
2551
while((interface=argz_next(interfaces_to_take_down,
2552
interfaces_to_take_down_size,
2553
interface))){
2554
ret_errno = take_down_interface(interface);
2555
if(ret_errno != 0){
2556
errno = ret_errno;
3048
2557
perror_plus("Failed to take down interface");
3049
2558
}
3050
2559
}
3055
2564
}
3056
2565
}
3057
2566
3058
ret = lower_privileges_permanently();
3059
if(ret != 0){
3060
errno = ret;
2567
ret_errno = lower_privileges_permanently();
2568
if(ret_errno != 0){
3061
2569
perror_plus("Failed to lower privileges permanently");
3062
2570
}
3063
2571
}
3065
2573
free(interfaces_to_take_down);
3066
2574
free(interfaces_hooks);
3067
2575
3068
void clean_dir_at(int base, const char * const dirname,
3069
uintmax_t level){
3070
struct dirent **direntries = NULL;
3071
int dret;
3072
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3073
O_RDONLY
3074
| O_NOFOLLOW
3075
| O_DIRECTORY
3076
| O_PATH));
3077
if(dir_fd == -1){
3078
perror_plus("open");
3079
return;
3080
}
3081
int numentries = scandirat(dir_fd, ".", &direntries,
3082
notdotentries, alphasort);
3083
if(numentries >= 0){
3084
for(int i = 0; i < numentries; i++){
3085
if(debug){
3086
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3087
dirname, direntries[i]->d_name);
3088
}
3089
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3090
if(dret == -1){
3091
if(errno == EISDIR){
3092
dret = unlinkat(dir_fd, direntries[i]->d_name,
3093
AT_REMOVEDIR);
3094
}
3095
if((dret == -1) and (errno == ENOTEMPTY)
3096
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3097
== 0) and (level == 0)){
3098
/* Recurse only in this special case */
3099
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3100
dret = 0;
3101
}
3102
if((dret == -1) and (errno != ENOENT)){
3103
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3104
direntries[i]->d_name, strerror(errno));
3105
}
3106
}
3107
free(direntries[i]);
3108
}
3109
3110
/* need to clean even if 0 because man page doesn't specify */
3111
free(direntries);
3112
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3113
if(dret == -1 and errno != ENOENT){
3114
perror_plus("rmdir");
3115
}
3116
} else {
3117
perror_plus("scandirat");
3118
}
3119
close(dir_fd);
3120
}
3121
3122
2576
/* Removes the GPGME temp directory and all files inside */
3123
2577
if(tempdir != NULL){
3124
clean_dir_at(-1, tempdir, 0);
2578
struct dirent **direntries = NULL;
2579
struct dirent *direntry = NULL;
2580
int numentries = scandir(tempdir, &direntries, notdotentries,
2581
alphasort);
2582
if(numentries > 0){
2583
for(int i = 0; i < numentries; i++){
2584
direntry = direntries[i];
2585
char *fullname = NULL;
2586
ret = asprintf(&fullname, "%s/%s", tempdir,
2587
direntry->d_name);
2588
if(ret < 0){
2589
perror_plus("asprintf");
2590
continue;
2591
}
2592
ret = remove(fullname);
2593
if(ret == -1){
2594
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2595
strerror(errno));
2596
}
2597
free(fullname);
2598
}
2599
}
2600
2601
/* need to clean even if 0 because man page doesn't specify */
2602
free(direntries);
2603
if(numentries == -1){
2604
perror_plus("scandir");
2605
}
2606
ret = rmdir(tempdir);
2607
if(ret == -1 and errno != ENOENT){
2608
perror_plus("rmdir");
2609
}
3125
2610
}
3126
2611
3127
2612
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0