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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:59:20 UTC
- Revision ID: teddy@recompile.se-20140607215920-r4qkj7ktnjyqmrn5
Make mandos-client use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
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
*/
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
240
233
.af = af };
241
234
if(new_server->ip == NULL){
242
235
perror_plus("strdup");
243
free(new_server);
244
236
return false;
245
237
}
246
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
239
if(ret == -1){
248
240
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
241
return false;
259
242
}
260
243
/* Special case of first server */
310
293
gpgme_strsource(rc), gpgme_strerror(rc));
311
294
return false;
312
295
}
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
296
389
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
298
if(ret == -1){
391
299
perror_plus("close");
392
300
}
431
339
/* Create new GPGME "context" */
432
340
rc = gpgme_new(&(mc->ctx));
433
341
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
436
345
return false;
437
346
}
438
347
474
383
/* Create new empty GPGME data buffer for the plaintext */
475
384
rc = gpgme_data_new(&dh_plain);
476
385
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
478
388
gpgme_strsource(rc), gpgme_strerror(rc));
479
389
gpgme_data_release(dh_crypto);
480
390
return -1;
493
403
if(result == NULL){
494
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
495
405
} 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");
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
502
410
if(result->file_name != NULL){
503
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
504
412
}
574
482
return plaintext_length;
575
483
}
576
484
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
485
__attribute__((warn_unused_result))
585
486
static const char *safer_gnutls_strerror(int value){
586
487
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
588
491
}
589
492
590
493
/* GnuTLS log function callback */
594
497
fprintf_plus(stderr, "GnuTLS: %s", string);
595
498
}
596
499
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
598
501
static int init_gnutls_global(const char *pubkeyfilename,
599
502
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
503
mandos_context *mc){
602
504
int ret;
603
unsigned int uret;
604
505
605
506
if(debug){
606
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
607
508
}
608
509
510
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
514
return -1;
515
}
516
609
517
if(debug){
610
518
/* "Use a log level over 10 to enable all debugging options."
611
519
* - GnuTLS manual
619
527
if(ret != GNUTLS_E_SUCCESS){
620
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
622
531
return -1;
623
532
}
624
533
649
558
safer_gnutls_strerror(ret));
650
559
goto globalfail;
651
560
}
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
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
565
goto globalfail;
566
}
567
829
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
830
569
831
570
return 0;
833
572
globalfail:
834
573
835
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
836
576
gnutls_dh_params_deinit(mc->dh_params);
837
577
return -1;
838
578
}
890
630
/* ignore client certificate if any. */
891
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
892
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
893
635
return 0;
894
636
}
895
637
897
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
898
640
__attribute__((unused)) const char *txt){}
899
641
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
642
/* Called when a Mandos server is found */
1119
643
__attribute__((nonnull, warn_unused_result))
1120
644
static int start_mandos_communication(const char *ip, in_port_t port,
1131
655
int retval = -1;
1132
656
gnutls_session_t session;
1133
657
int pf; /* Protocol family */
1134
bool route_added = false;
1135
658
1136
659
errno = 0;
1137
660
1159
682
bool match = false;
1160
683
{
1161
684
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1165
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
688
match = true;
1167
689
break;
1196
718
PRIuMAX "\n", ip, (uintmax_t)port);
1197
719
}
1198
720
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1200
722
if(tcp_sd < 0){
1201
723
int e = errno;
1202
724
perror_plus("socket");
1209
731
goto mandos_end;
1210
732
}
1211
733
734
memset(&to, 0, sizeof(to));
1212
735
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);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1216
738
} 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);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1220
741
}
1221
742
if(ret < 0 ){
1222
743
int e = errno;
1292
813
goto mandos_end;
1293
814
}
1294
815
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;
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
1350
835
}
1351
836
1352
837
const char *out = mandos_protocol_version;
1506
991
&decrypted_buffer, mc);
1507
992
if(decrypted_buffer_size >= 0){
1508
993
1509
clearerr(stdout);
1510
994
written = 0;
1511
995
while(written < (size_t) decrypted_buffer_size){
1512
996
if(quit_now){
1528
1012
}
1529
1013
written += (size_t)ret;
1530
1014
}
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
1015
retval = 0;
1542
1016
}
1543
1017
}
1546
1020
1547
1021
mandos_end:
1548
1022
{
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
1023
int e = errno;
1556
1024
free(decrypted_buffer);
1557
1025
free(buffer);
1558
1026
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1560
1028
}
1561
1029
if(ret == -1){
1562
1030
if(e == 0){
1574
1042
return retval;
1575
1043
}
1576
1044
1045
__attribute__((nonnull))
1577
1046
static void resolve_callback(AvahiSServiceResolver *r,
1578
1047
AvahiIfIndex interface,
1579
1048
AvahiProtocol proto,
1596
1065
timed out */
1597
1066
1598
1067
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1600
1068
return;
1601
1069
}
1602
1070
1716
1184
__attribute__((nonnull, warn_unused_result))
1717
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
1186
int ret;
1719
int old_errno;
1187
error_t ret_errno;
1720
1188
1721
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
1190
if(s < 0){
1723
old_errno = errno;
1191
ret_errno = errno;
1724
1192
perror_plus("socket");
1725
errno = old_errno;
1193
errno = ret_errno;
1726
1194
return false;
1727
1195
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1730
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
1198
if(ret == -1){
1732
1199
if(debug){
1733
old_errno = errno;
1200
ret_errno = errno;
1734
1201
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;
1202
errno = ret_errno;
1741
1203
}
1742
1204
return false;
1743
1205
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
1206
return true;
1750
1207
}
1751
1208
1889
1346
return 0;
1890
1347
}
1891
1348
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1893
1357
if(ret == -1){
1894
1358
if(debug){
1895
1359
perror_plus("Could not stat hook");
1896
1360
}
1897
1361
return 0;
1898
1362
}
1363
free(fullname);
1899
1364
if(not (S_ISREG(st.st_mode))){
1900
1365
/* Not a regular file */
1901
1366
if(debug){
1993
1458
}
1994
1459
}
1995
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1996
1536
__attribute__((nonnull))
1997
1537
void run_network_hooks(const char *mode, const char *interface,
1998
1538
const float delay){
1999
struct dirent **direntries = NULL;
1539
struct dirent **direntries;
2000
1540
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
2003
1548
if(hookdir_fd == -1){
2004
1549
if(errno == ENOENT){
2005
1550
if(debug){
2011
1556
}
2012
1557
return;
2013
1558
}
2014
}
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
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
2020
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
2022
1583
if(numhooks == -1){
2023
1584
perror_plus("scandir");
2024
close(devnull);
2025
1585
return;
2026
1586
}
2027
1587
struct dirent *direntry;
2028
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
2029
1590
for(int i = 0; i < numhooks; i++){
2030
1591
direntry = direntries[i];
2031
1592
if(debug){
2036
1597
if(hook_pid == 0){
2037
1598
/* Child */
2038
1599
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
1600
if(raise_privileges_permanently() != 0){
2041
1601
perror_plus("Failed to raise privileges");
2042
1602
_exit(EX_NOPERM);
2043
1603
}
2055
1615
perror_plus("setgroups");
2056
1616
_exit(EX_NOPERM);
2057
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
2058
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
1634
if(ret == -1){
2060
1635
perror_plus("setenv");
2095
1670
_exit(EX_OSERR);
2096
1671
}
2097
1672
}
2098
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
direntry->d_name,
2100
O_RDONLY));
2101
if(hook_fd == -1){
2102
perror_plus("openat");
2103
_exit(EXIT_FAILURE);
2104
}
2105
if(close(hookdir_fd) == -1){
2106
perror_plus("close");
2107
_exit(EXIT_FAILURE);
2108
}
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
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2125
environ) == -1){
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
2126
1675
perror_plus("fexecve");
2127
1676
_exit(EXIT_FAILURE);
2128
1677
}
2129
1678
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
1679
int status;
2136
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
1681
perror_plus("waitpid");
2138
free(direntry);
2139
1682
continue;
2140
1683
}
2141
1684
if(WIFEXITED(status)){
2143
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
1687
" with status %d\n", direntry->d_name,
2145
1688
WEXITSTATUS(status));
2146
free(direntry);
2147
1689
continue;
2148
1690
}
2149
1691
} else if(WIFSIGNALED(status)){
2150
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
1693
" signal %d\n", direntry->d_name,
2152
1694
WTERMSIG(status));
2153
free(direntry);
2154
1695
continue;
2155
1696
} else {
2156
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
1698
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
1699
continue;
2160
1700
}
2161
1701
}
2163
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
1704
direntry->d_name);
2165
1705
}
2166
free(direntry);
2167
1706
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2170
1708
perror_plus("close");
2171
1709
} else {
2172
1710
hookdir_fd = -1;
2175
1713
}
2176
1714
2177
1715
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
2181
1719
int ret;
2182
1720
struct ifreq network;
2183
1721
unsigned int if_index = if_nametoindex(interface);
2193
1731
}
2194
1732
2195
1733
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
1734
error_t ret_errno = 0, ioctl_errno = 0;
2198
1735
if(not get_flags(interface, &network)){
2199
1736
ret_errno = errno;
2200
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2213
1750
}
2214
1751
2215
1752
if(quit_now){
2216
ret = close(sd);
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2217
1754
if(ret == -1){
2218
1755
perror_plus("close");
2219
1756
}
2229
1766
/* Raise privileges */
2230
1767
ret_errno = raise_privileges();
2231
1768
if(ret_errno != 0){
2232
errno = ret_errno;
2233
1769
perror_plus("Failed to raise privileges");
2234
1770
}
2235
1771
2269
1805
}
2270
1806
2271
1807
/* Close the socket */
2272
ret = close(sd);
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2273
1809
if(ret == -1){
2274
1810
perror_plus("close");
2275
1811
}
2287
1823
2288
1824
/* Sleep checking until interface is running.
2289
1825
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
1826
for(int i=0; i < delay * 4; i++){
2291
1827
if(interface_is_running(interface)){
2292
1828
break;
2293
1829
}
2303
1839
}
2304
1840
2305
1841
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
2308
1844
struct ifreq network;
2309
1845
unsigned int if_index = if_nametoindex(interface);
2310
1846
if(if_index == 0){
2313
1849
return ENXIO;
2314
1850
}
2315
1851
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
1852
error_t ret_errno = 0, ioctl_errno = 0;
2318
1853
if(not get_flags(interface, &network) and debug){
2319
1854
ret_errno = errno;
2320
1855
fprintf_plus(stderr, "Failed to get flags for interface "
2340
1875
/* Raise privileges */
2341
1876
ret_errno = raise_privileges();
2342
1877
if(ret_errno != 0){
2343
errno = ret_errno;
2344
1878
perror_plus("Failed to raise privileges");
2345
1879
}
2346
1880
2358
1892
}
2359
1893
2360
1894
/* Close the socket */
2361
int ret = close(sd);
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2362
1896
if(ret == -1){
2363
1897
perror_plus("close");
2364
1898
}
2379
1913
}
2380
1914
2381
1915
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 };
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
2387
1920
AvahiSServiceBrowser *sb = NULL;
2388
1921
error_t ret_errno;
2389
1922
int ret;
2398
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
1932
const char *seckey = PATHDIR "/" SECKEY;
2400
1933
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
1934
char *interfaces_hooks = NULL;
2403
1935
2404
1936
bool gnutls_initialized = false;
2457
1989
.doc = "Bit length of the prime number used in the"
2458
1990
" Diffie-Hellman key exchange",
2459
1991
.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
1992
{ .name = "priority", .key = 130,
2466
1993
.arg = "STRING",
2467
1994
.doc = "GnuTLS priority string for the TLS handshake",
2522
2049
}
2523
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2524
2051
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
2528
2052
case 130: /* --priority */
2529
2053
mc.priority = arg;
2530
2054
break;
2570
2094
.args_doc = "",
2571
2095
.doc = "Mandos client -- Get and decrypt"
2572
2096
" 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){
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2576
2100
case 0:
2577
2101
break;
2578
2102
case ENOMEM:
2579
2103
default:
2580
errno = ret_errno;
2104
errno = ret;
2581
2105
perror_plus("argp_parse");
2582
2106
exitcode = EX_OSERR;
2583
2107
goto end;
2586
2110
goto end;
2587
2111
}
2588
2112
}
2589
2113
2590
2114
{
2591
2115
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2116
<http://bugs.debian.org/633582> */
2593
2117
2594
2118
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2598
2122
perror_plus("Failed to raise privileges");
2599
2123
} else {
2600
2124
struct stat st;
2616
2140
}
2617
2141
}
2618
2142
}
2619
close(seckey_fd);
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2620
2144
}
2621
2145
}
2622
2146
2623
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2625
2149
if(pubkey_fd == -1){
2637
2161
}
2638
2162
}
2639
2163
}
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
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2666
2168
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2670
2172
perror_plus("Failed to lower privileges");
2671
2173
}
2672
2174
}
2785
2287
2786
2288
/* If no interfaces were specified, make a list */
2787
2289
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2290
struct dirent **direntries;
2789
2291
/* Look for any good interfaces */
2790
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2791
2293
alphasort);
2797
2299
if(ret_errno != 0){
2798
2300
errno = ret_errno;
2799
2301
perror_plus("argz_add");
2800
free(direntries[i]);
2801
2302
continue;
2802
2303
}
2803
2304
if(debug){
2804
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
2306
direntries[i]->d_name);
2806
2307
}
2807
free(direntries[i]);
2808
2308
}
2809
2309
free(direntries);
2810
2310
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2311
free(direntries);
2814
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2815
2313
exitcode = EXIT_FAILURE;
2816
2314
goto end;
2842
2340
errno = bring_up_interface(interface, delay);
2843
2341
if(not interface_was_up){
2844
2342
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2343
perror_plus("Failed to bring up interface");
2847
2344
} else {
2848
2345
errno = argz_add(&interfaces_to_take_down,
2849
2346
&interfaces_to_take_down_size,
2872
2369
goto end;
2873
2370
}
2874
2371
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2876
2373
if(ret == -1){
2877
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2878
2375
exitcode = EX_UNAVAILABLE;
3000
2497
3001
2498
/* Allocate a new server */
3002
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
2500
&config, NULL, NULL, &ret_errno);
3004
2501
3005
2502
/* Free the Avahi configuration data */
3006
2503
avahi_server_config_free(&config);
3009
2506
/* Check if creating the Avahi server object succeeded */
3010
2507
if(mc.server == NULL){
3011
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
2509
avahi_strerror(ret_errno));
3013
2510
exitcode = EX_UNAVAILABLE;
3014
2511
goto end;
3015
2512
}
3050
2547
end:
3051
2548
3052
2549
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
}
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3060
2551
}
3061
2552
3062
2553
/* Cleanup things */
3073
2564
3074
2565
if(gnutls_initialized){
3075
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
3076
2568
gnutls_dh_params_deinit(mc.dh_params);
3077
2569
}
3078
2570
3086
2578
mc.current_server->prev->next = NULL;
3087
2579
while(mc.current_server != NULL){
3088
2580
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
2581
free(mc.current_server);
3098
2582
mc.current_server = next;
3099
2583
}
3101
2585
3102
2586
/* Re-raise privileges */
3103
2587
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
3107
2590
perror_plus("Failed to raise privileges");
3108
2591
} else {
3109
2592
3114
2597
/* Take down the network interfaces which were brought up */
3115
2598
{
3116
2599
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;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
3123
2606
perror_plus("Failed to take down interface");
3124
2607
}
3125
2608
}
3130
2613
}
3131
2614
}
3132
2615
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
3136
2618
perror_plus("Failed to lower privileges permanently");
3137
2619
}
3138
2620
}
3140
2622
free(interfaces_to_take_down);
3141
2623
free(interfaces_hooks);
3142
2624
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
2625
/* Removes the GPGME temp directory and all files inside */
3198
2626
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
2634
char *fullname = NULL;
2635
ret = asprintf(&fullname, "%s/%s", tempdir,
2636
direntry->d_name);
2637
if(ret < 0){
2638
perror_plus("asprintf");
2639
continue;
2640
}
2641
ret = remove(fullname);
2642
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2645
}
2646
free(fullname);
2647
}
2648
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2651
free(direntries);
2652
if(numentries == -1){
2653
perror_plus("scandir");
2654
}
2655
ret = rmdir(tempdir);
2656
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
2658
}
3200
2659
}
3201
2660
3202
2661
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0