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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
}
505
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
507
r = r->next){
413
gpgme_recipient_t recipient;
414
recipient = result->recipients;
415
while(recipient != NULL){
508
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
511
420
fprintf_plus(stderr, "Secret key available: %s\n",
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
513
424
}
514
425
}
515
426
}
571
482
return plaintext_length;
572
483
}
573
484
574
__attribute__((warn_unused_result, const))
575
static const char *safe_string(const char *str){
576
if(str == NULL)
577
return "(unknown)";
578
return str;
579
}
580
581
485
__attribute__((warn_unused_result))
582
486
static const char *safer_gnutls_strerror(int value){
583
487
const char *ret = gnutls_strerror(value);
584
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
585
491
}
586
492
587
493
/* GnuTLS log function callback */
591
497
fprintf_plus(stderr, "GnuTLS: %s", string);
592
498
}
593
499
594
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
595
501
static int init_gnutls_global(const char *pubkeyfilename,
596
502
const char *seckeyfilename,
597
const char *dhparamsfilename,
598
503
mandos_context *mc){
599
504
int ret;
600
unsigned int uret;
601
505
602
506
if(debug){
603
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
604
508
}
605
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
606
517
if(debug){
607
518
/* "Use a log level over 10 to enable all debugging options."
608
519
* - GnuTLS manual
616
527
if(ret != GNUTLS_E_SUCCESS){
617
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
618
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
619
531
return -1;
620
532
}
621
533
646
558
safer_gnutls_strerror(ret));
647
559
goto globalfail;
648
560
}
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
652
do {
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
654
if(dhpfile == -1){
655
perror_plus("open");
656
dhparamsfilename = NULL;
657
break;
658
}
659
size_t params_capacity = 0;
660
while(true){
661
params_capacity = incbuffer((char **)¶ms.data,
662
(size_t)params.size,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
666
free(params.data);
667
params.data = NULL;
668
dhparamsfilename = NULL;
669
break;
670
}
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
673
BUFFER_SIZE);
674
/* EOF */
675
if(bytes_read == 0){
676
break;
677
}
678
/* check bytes_read for failure */
679
if(bytes_read < 0){
680
perror_plus("read");
681
free(params.data);
682
params.data = NULL;
683
dhparamsfilename = NULL;
684
break;
685
}
686
params.size += (unsigned int)bytes_read;
687
}
688
ret = close(dhpfile);
689
if(ret == -1){
690
perror_plus("close");
691
}
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
694
}
695
if(dhparamsfilename == NULL){
696
break;
697
}
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
705
}
706
free(params.data);
707
} while(false);
708
}
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
714
do {
715
int secfile = open(seckeyfilename, O_RDONLY);
716
if(secfile == -1){
717
perror_plus("open");
718
break;
719
}
720
size_t buffer_capacity = 0;
721
while(true){
722
buffer_capacity = incbuffer((char **)&buffer.data,
723
(size_t)buffer.size,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
727
free(buffer.data);
728
buffer.data = NULL;
729
break;
730
}
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
733
BUFFER_SIZE);
734
/* EOF */
735
if(bytes_read == 0){
736
break;
737
}
738
/* check bytes_read for failure */
739
if(bytes_read < 0){
740
perror_plus("read");
741
free(buffer.data);
742
buffer.data = NULL;
743
break;
744
}
745
buffer.size += (unsigned int)bytes_read;
746
}
747
close(secfile);
748
} while(false);
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
752
{
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
757
" structure: %s",
758
safer_gnutls_strerror(ret));
759
free(buffer.data);
760
buffer.data = NULL;
761
} else {
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
767
privkey = NULL;
768
}
769
free(buffer.data);
770
buffer.data = NULL;
771
if(privkey != NULL){
772
/* Use private key to suggest an appropriate
773
sec_param */
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
776
if(debug){
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
780
(sec_param)));
781
}
782
}
783
}
784
}
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
788
if(debug){
789
fprintf_plus(stderr, "Falling back to security parameter"
790
" \"%s\"\n",
791
safe_string(gnutls_sec_param_get_name
792
(sec_param)));
793
}
794
}
795
}
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
797
if(uret != 0){
798
mc->dh_bits = uret;
799
if(debug){
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
803
(sec_param)),
804
mc->dh_bits);
805
}
806
} else {
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
810
(sec_param)),
811
safer_gnutls_strerror(ret));
812
goto globalfail;
813
}
814
} else if(debug){
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
816
mc->dh_bits);
817
}
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
823
goto globalfail;
824
}
825
}
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
826
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
827
569
828
570
return 0;
830
572
globalfail:
831
573
832
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
833
576
gnutls_dh_params_deinit(mc->dh_params);
834
577
return -1;
835
578
}
887
630
/* ignore client certificate if any. */
888
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
889
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
890
635
return 0;
891
636
}
892
637
894
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
895
640
__attribute__((unused)) const char *txt){}
896
641
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
901
int ret = 0;
902
if(seteuid(0) == -1){
903
ret = errno;
904
}
905
errno = old_errno;
906
return ret;
907
}
908
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
914
if(ret != 0){
915
errno = old_errno;
916
return ret;
917
}
918
if(setuid(0) == -1){
919
ret = errno;
920
}
921
errno = old_errno;
922
return ret;
923
}
924
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
929
int ret = 0;
930
if(seteuid(uid) == -1){
931
ret = errno;
932
}
933
errno = old_errno;
934
return ret;
935
}
936
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
941
int ret = 0;
942
if(setuid(uid) == -1){
943
ret = errno;
944
}
945
errno = old_errno;
946
return ret;
947
}
948
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
952
const char *address,
953
AvahiIfIndex if_index){
954
int ret;
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
961
if(debug){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
964
}
965
return false;
966
}
967
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
971
return false;
972
}
973
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
975
if(devnull == -1){
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
977
return false;
978
}
979
pid_t pid = fork();
980
if(pid == 0){
981
/* Child */
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
984
if(errno != 0){
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
987
} else {
988
/* Set group */
989
errno = 0;
990
ret = setgid(0);
991
if(ret == -1){
992
perror_plus("setgid");
993
_exit(EX_NOPERM);
994
}
995
/* Reset supplementary groups */
996
errno = 0;
997
ret = setgroups(0, NULL);
998
if(ret == -1){
999
perror_plus("setgroups");
1000
_exit(EX_NOPERM);
1001
}
1002
}
1003
ret = dup2(devnull, STDIN_FILENO);
1004
if(ret == -1){
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1006
_exit(EX_OSERR);
1007
}
1008
ret = close(devnull);
1009
if(ret == -1){
1010
perror_plus("close");
1011
_exit(EX_OSERR);
1012
}
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1014
if(ret == -1){
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1016
_exit(EX_OSERR);
1017
}
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1019
O_RDONLY
1020
| O_DIRECTORY
1021
| O_PATH
1022
| O_CLOEXEC));
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1026
}
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1028
helper, O_RDONLY));
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1033
}
1034
close(helperdir_fd);
1035
#ifdef __GNUC__
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1038
#endif
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1042
environ) == -1){
1043
#ifdef __GNUC__
1044
#pragma GCC diagnostic pop
1045
#endif
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1048
}
1049
}
1050
if(pid == -1){
1051
perror_plus("fork");
1052
return false;
1053
}
1054
int status;
1055
pid_t pret = -1;
1056
errno = 0;
1057
do {
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1065
}
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1068
}
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1071
" helper program");
1072
}
1073
return false;
1074
}
1075
} while(pret == -1 and errno == EINTR);
1076
if(pret == -1){
1077
perror_plus("waitpid");
1078
return false;
1079
}
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1084
return false;
1085
}
1086
return true;
1087
}
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1091
return false;
1092
}
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1094
return false;
1095
}
1096
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1100
if(debug){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1102
}
1103
return add_delete_local_route(true, address, if_index);
1104
}
1105
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1109
if(debug){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1111
}
1112
return add_delete_local_route(false, address, if_index);
1113
}
1114
1115
642
/* Called when a Mandos server is found */
1116
643
__attribute__((nonnull, warn_unused_result))
1117
644
static int start_mandos_communication(const char *ip, in_port_t port,
1128
655
int retval = -1;
1129
656
gnutls_session_t session;
1130
657
int pf; /* Protocol family */
1131
bool route_added = false;
1132
658
1133
659
errno = 0;
1134
660
1156
682
bool match = false;
1157
683
{
1158
684
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1161
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1162
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1163
688
match = true;
1164
689
break;
1193
718
PRIuMAX "\n", ip, (uintmax_t)port);
1194
719
}
1195
720
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1197
722
if(tcp_sd < 0){
1198
723
int e = errno;
1199
724
perror_plus("socket");
1206
731
goto mandos_end;
1207
732
}
1208
733
734
memset(&to, 0, sizeof(to));
1209
735
if(af == AF_INET6){
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1213
738
} else { /* IPv4 */
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1217
741
}
1218
742
if(ret < 0 ){
1219
743
int e = errno;
1289
813
goto mandos_end;
1290
814
}
1291
815
1292
while(true){
1293
if(af == AF_INET6){
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1296
} else {
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1299
}
1300
if(ret < 0){
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1307
&to)->sin6_addr)))
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1318
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1322
*/
1323
if(debug){
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1325
" direct route\n");
1326
}
1327
int e = errno;
1328
route_added = add_local_route(ip, if_index);
1329
if(route_added){
1330
continue;
1331
}
1332
errno = e;
1333
}
1334
if(errno != ECONNREFUSED or debug){
1335
int e = errno;
1336
perror_plus("connect");
1337
errno = e;
1338
}
1339
goto mandos_end;
1340
}
1341
1342
if(quit_now){
1343
errno = EINTR;
1344
goto mandos_end;
1345
}
1346
break;
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;
1347
835
}
1348
836
1349
837
const char *out = mandos_protocol_version;
1503
991
&decrypted_buffer, mc);
1504
992
if(decrypted_buffer_size >= 0){
1505
993
1506
clearerr(stdout);
1507
994
written = 0;
1508
995
while(written < (size_t) decrypted_buffer_size){
1509
996
if(quit_now){
1525
1012
}
1526
1013
written += (size_t)ret;
1527
1014
}
1528
ret = fflush(stdout);
1529
if(ret != 0){
1530
int e = errno;
1531
if(debug){
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1533
strerror(errno));
1534
}
1535
errno = e;
1536
goto mandos_end;
1537
}
1538
1015
retval = 0;
1539
1016
}
1540
1017
}
1543
1020
1544
1021
mandos_end:
1545
1022
{
1546
if(route_added){
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1550
}
1551
}
1552
1023
int e = errno;
1553
1024
free(decrypted_buffer);
1554
1025
free(buffer);
1555
1026
if(tcp_sd >= 0){
1556
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1557
1028
}
1558
1029
if(ret == -1){
1559
1030
if(e == 0){
1571
1042
return retval;
1572
1043
}
1573
1044
1045
__attribute__((nonnull))
1574
1046
static void resolve_callback(AvahiSServiceResolver *r,
1575
1047
AvahiIfIndex interface,
1576
1048
AvahiProtocol proto,
1593
1065
timed out */
1594
1066
1595
1067
if(quit_now){
1596
avahi_s_service_resolver_free(r);
1597
1068
return;
1598
1069
}
1599
1070
1713
1184
__attribute__((nonnull, warn_unused_result))
1714
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1715
1186
int ret;
1716
int old_errno;
1187
error_t ret_errno;
1717
1188
1718
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
1190
if(s < 0){
1720
old_errno = errno;
1191
ret_errno = errno;
1721
1192
perror_plus("socket");
1722
errno = old_errno;
1193
errno = ret_errno;
1723
1194
return false;
1724
1195
}
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1727
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1728
1198
if(ret == -1){
1729
1199
if(debug){
1730
old_errno = errno;
1200
ret_errno = errno;
1731
1201
perror_plus("ioctl SIOCGIFFLAGS");
1732
errno = old_errno;
1733
}
1734
if((close(s) == -1) and debug){
1735
old_errno = errno;
1736
perror_plus("close");
1737
errno = old_errno;
1202
errno = ret_errno;
1738
1203
}
1739
1204
return false;
1740
1205
}
1741
if((close(s) == -1) and debug){
1742
old_errno = errno;
1743
perror_plus("close");
1744
errno = old_errno;
1745
}
1746
1206
return true;
1747
1207
}
1748
1208
1886
1346
return 0;
1887
1347
}
1888
1348
1889
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);
1890
1357
if(ret == -1){
1891
1358
if(debug){
1892
1359
perror_plus("Could not stat hook");
1893
1360
}
1894
1361
return 0;
1895
1362
}
1363
free(fullname);
1896
1364
if(not (S_ISREG(st.st_mode))){
1897
1365
/* Not a regular file */
1898
1366
if(debug){
1990
1458
}
1991
1459
}
1992
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
1993
1536
__attribute__((nonnull))
1994
1537
void run_network_hooks(const char *mode, const char *interface,
1995
1538
const float delay){
1996
struct dirent **direntries = NULL;
1539
struct dirent **direntries;
1997
1540
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1999
| 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
);
2000
1548
if(hookdir_fd == -1){
2001
1549
if(errno == ENOENT){
2002
1550
if(debug){
2008
1556
}
2009
1557
return;
2010
1558
}
2011
}
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2013
if(devnull == -1){
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2015
return;
2016
}
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)
2017
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
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__ */
2019
1583
if(numhooks == -1){
2020
1584
perror_plus("scandir");
2021
close(devnull);
2022
1585
return;
2023
1586
}
2024
1587
struct dirent *direntry;
2025
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
2026
1590
for(int i = 0; i < numhooks; i++){
2027
1591
direntry = direntries[i];
2028
1592
if(debug){
2033
1597
if(hook_pid == 0){
2034
1598
/* Child */
2035
1599
/* Raise privileges */
2036
errno = raise_privileges_permanently();
2037
if(errno != 0){
1600
if(raise_privileges_permanently() != 0){
2038
1601
perror_plus("Failed to raise privileges");
2039
1602
_exit(EX_NOPERM);
2040
1603
}
2052
1615
perror_plus("setgroups");
2053
1616
_exit(EX_NOPERM);
2054
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
}
2055
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2056
1634
if(ret == -1){
2057
1635
perror_plus("setenv");
2092
1670
_exit(EX_OSERR);
2093
1671
}
2094
1672
}
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2096
direntry->d_name,
2097
O_RDONLY));
2098
if(hook_fd == -1){
2099
perror_plus("openat");
2100
_exit(EXIT_FAILURE);
2101
}
2102
if(close(hookdir_fd) == -1){
2103
perror_plus("close");
2104
_exit(EXIT_FAILURE);
2105
}
2106
ret = dup2(devnull, STDIN_FILENO);
2107
if(ret == -1){
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2109
_exit(EX_OSERR);
2110
}
2111
ret = close(devnull);
2112
if(ret == -1){
2113
perror_plus("close");
2114
_exit(EX_OSERR);
2115
}
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2117
if(ret == -1){
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2119
_exit(EX_OSERR);
2120
}
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2122
environ) == -1){
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
2123
1675
perror_plus("fexecve");
2124
1676
_exit(EXIT_FAILURE);
2125
1677
}
2126
1678
} else {
2127
if(hook_pid == -1){
2128
perror_plus("fork");
2129
free(direntry);
2130
continue;
2131
}
2132
1679
int status;
2133
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2134
1681
perror_plus("waitpid");
2135
free(direntry);
2136
1682
continue;
2137
1683
}
2138
1684
if(WIFEXITED(status)){
2140
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2141
1687
" with status %d\n", direntry->d_name,
2142
1688
WEXITSTATUS(status));
2143
free(direntry);
2144
1689
continue;
2145
1690
}
2146
1691
} else if(WIFSIGNALED(status)){
2147
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2148
1693
" signal %d\n", direntry->d_name,
2149
1694
WTERMSIG(status));
2150
free(direntry);
2151
1695
continue;
2152
1696
} else {
2153
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
2154
1698
" crashed\n", direntry->d_name);
2155
free(direntry);
2156
1699
continue;
2157
1700
}
2158
1701
}
2160
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2161
1704
direntry->d_name);
2162
1705
}
2163
free(direntry);
2164
1706
}
2165
free(direntries);
2166
if(close(hookdir_fd) == -1){
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2167
1708
perror_plus("close");
2168
1709
} else {
2169
1710
hookdir_fd = -1;
2172
1713
}
2173
1714
2174
1715
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2176
const float delay){
2177
int old_errno = errno;
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
2178
1719
int ret;
2179
1720
struct ifreq network;
2180
1721
unsigned int if_index = if_nametoindex(interface);
2190
1731
}
2191
1732
2192
1733
if(not interface_is_up(interface)){
2193
int ret_errno = 0;
2194
int ioctl_errno = 0;
1734
error_t ret_errno = 0, ioctl_errno = 0;
2195
1735
if(not get_flags(interface, &network)){
2196
1736
ret_errno = errno;
2197
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2210
1750
}
2211
1751
2212
1752
if(quit_now){
2213
ret = close(sd);
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2214
1754
if(ret == -1){
2215
1755
perror_plus("close");
2216
1756
}
2226
1766
/* Raise privileges */
2227
1767
ret_errno = raise_privileges();
2228
1768
if(ret_errno != 0){
2229
errno = ret_errno;
2230
1769
perror_plus("Failed to raise privileges");
2231
1770
}
2232
1771
2266
1805
}
2267
1806
2268
1807
/* Close the socket */
2269
ret = close(sd);
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1809
if(ret == -1){
2271
1810
perror_plus("close");
2272
1811
}
2284
1823
2285
1824
/* Sleep checking until interface is running.
2286
1825
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
1826
for(int i=0; i < delay * 4; i++){
2288
1827
if(interface_is_running(interface)){
2289
1828
break;
2290
1829
}
2300
1839
}
2301
1840
2302
1841
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
2305
1844
struct ifreq network;
2306
1845
unsigned int if_index = if_nametoindex(interface);
2307
1846
if(if_index == 0){
2310
1849
return ENXIO;
2311
1850
}
2312
1851
if(interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
1852
error_t ret_errno = 0, ioctl_errno = 0;
2315
1853
if(not get_flags(interface, &network) and debug){
2316
1854
ret_errno = errno;
2317
1855
fprintf_plus(stderr, "Failed to get flags for interface "
2337
1875
/* Raise privileges */
2338
1876
ret_errno = raise_privileges();
2339
1877
if(ret_errno != 0){
2340
errno = ret_errno;
2341
1878
perror_plus("Failed to raise privileges");
2342
1879
}
2343
1880
2355
1892
}
2356
1893
2357
1894
/* Close the socket */
2358
int ret = close(sd);
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2359
1896
if(ret == -1){
2360
1897
perror_plus("close");
2361
1898
}
2376
1913
}
2377
1914
2378
1915
int main(int argc, char *argv[]){
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
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 };
2384
1920
AvahiSServiceBrowser *sb = NULL;
2385
1921
error_t ret_errno;
2386
1922
int ret;
2395
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2396
1932
const char *seckey = PATHDIR "/" SECKEY;
2397
1933
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
1934
char *interfaces_hooks = NULL;
2400
1935
2401
1936
bool gnutls_initialized = false;
2454
1989
.doc = "Bit length of the prime number used in the"
2455
1990
" Diffie-Hellman key exchange",
2456
1991
.group = 2 },
2457
{ .name = "dh-params", .key = 134,
2458
.arg = "FILE",
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2461
.group = 2 },
2462
1992
{ .name = "priority", .key = 130,
2463
1993
.arg = "STRING",
2464
1994
.doc = "GnuTLS priority string for the TLS handshake",
2519
2049
}
2520
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2521
2051
break;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2524
break;
2525
2052
case 130: /* --priority */
2526
2053
mc.priority = arg;
2527
2054
break;
2567
2094
.args_doc = "",
2568
2095
.doc = "Mandos client -- Get and decrypt"
2569
2096
" passwords from a Mandos server" };
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2572
switch(ret_errno){
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2573
2100
case 0:
2574
2101
break;
2575
2102
case ENOMEM:
2576
2103
default:
2577
errno = ret_errno;
2104
errno = ret;
2578
2105
perror_plus("argp_parse");
2579
2106
exitcode = EX_OSERR;
2580
2107
goto end;
2583
2110
goto end;
2584
2111
}
2585
2112
}
2586
2113
2587
2114
{
2588
2115
/* Work around Debian bug #633582:
2589
<https://bugs.debian.org/633582> */
2116
<http://bugs.debian.org/633582> */
2590
2117
2591
2118
/* Re-raise privileges */
2592
ret = raise_privileges();
2593
if(ret != 0){
2594
errno = ret;
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2595
2122
perror_plus("Failed to raise privileges");
2596
2123
} else {
2597
2124
struct stat st;
2613
2140
}
2614
2141
}
2615
2142
}
2616
close(seckey_fd);
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2617
2144
}
2618
2145
}
2619
2146
2620
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2621
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2622
2149
if(pubkey_fd == -1){
2634
2161
}
2635
2162
}
2636
2163
}
2637
close(pubkey_fd);
2638
}
2639
}
2640
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2646
} else {
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2648
if(ret == -1){
2649
perror_plus("fstat");
2650
} else {
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2654
if(ret == -1){
2655
perror_plus("fchown");
2656
}
2657
}
2658
}
2659
close(dhparams_fd);
2660
}
2661
}
2662
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2663
2168
/* Lower privileges */
2664
ret = lower_privileges();
2665
if(ret != 0){
2666
errno = ret;
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2667
2172
perror_plus("Failed to lower privileges");
2668
2173
}
2669
2174
}
2782
2287
2783
2288
/* If no interfaces were specified, make a list */
2784
2289
if(mc.interfaces == NULL){
2785
struct dirent **direntries = NULL;
2290
struct dirent **direntries;
2786
2291
/* Look for any good interfaces */
2787
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2788
2293
alphasort);
2794
2299
if(ret_errno != 0){
2795
2300
errno = ret_errno;
2796
2301
perror_plus("argz_add");
2797
free(direntries[i]);
2798
2302
continue;
2799
2303
}
2800
2304
if(debug){
2801
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2802
2306
direntries[i]->d_name);
2803
2307
}
2804
free(direntries[i]);
2805
2308
}
2806
2309
free(direntries);
2807
2310
} else {
2808
if(ret == 0){
2809
free(direntries);
2810
}
2311
free(direntries);
2811
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2812
2313
exitcode = EXIT_FAILURE;
2813
2314
goto end;
2839
2340
errno = bring_up_interface(interface, delay);
2840
2341
if(not interface_was_up){
2841
2342
if(errno != 0){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2343
perror_plus("Failed to bring up interface");
2844
2344
} else {
2845
2345
errno = argz_add(&interfaces_to_take_down,
2846
2346
&interfaces_to_take_down_size,
2869
2369
goto end;
2870
2370
}
2871
2371
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2873
2373
if(ret == -1){
2874
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2875
2375
exitcode = EX_UNAVAILABLE;
2997
2497
2998
2498
/* Allocate a new server */
2999
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
2500
&config, NULL, NULL, &ret_errno);
3001
2501
3002
2502
/* Free the Avahi configuration data */
3003
2503
avahi_server_config_free(&config);
3006
2506
/* Check if creating the Avahi server object succeeded */
3007
2507
if(mc.server == NULL){
3008
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3009
avahi_strerror(ret));
2509
avahi_strerror(ret_errno));
3010
2510
exitcode = EX_UNAVAILABLE;
3011
2511
goto end;
3012
2512
}
3047
2547
end:
3048
2548
3049
2549
if(debug){
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3054
} else {
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3056
}
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3057
2551
}
3058
2552
3059
2553
/* Cleanup things */
3070
2564
3071
2565
if(gnutls_initialized){
3072
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
3073
2568
gnutls_dh_params_deinit(mc.dh_params);
3074
2569
}
3075
2570
3083
2578
mc.current_server->prev->next = NULL;
3084
2579
while(mc.current_server != NULL){
3085
2580
server *next = mc.current_server->next;
3086
#ifdef __GNUC__
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3089
#endif
3090
free((char *)(mc.current_server->ip));
3091
#ifdef __GNUC__
3092
#pragma GCC diagnostic pop
3093
#endif
3094
2581
free(mc.current_server);
3095
2582
mc.current_server = next;
3096
2583
}
3098
2585
3099
2586
/* Re-raise privileges */
3100
2587
{
3101
ret = raise_privileges();
3102
if(ret != 0){
3103
errno = ret;
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
3104
2590
perror_plus("Failed to raise privileges");
3105
2591
} else {
3106
2592
3111
2597
/* Take down the network interfaces which were brought up */
3112
2598
{
3113
2599
char *interface = NULL;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3116
interface))){
3117
ret = take_down_interface(interface);
3118
if(ret != 0){
3119
errno = ret;
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;
3120
2606
perror_plus("Failed to take down interface");
3121
2607
}
3122
2608
}
3127
2613
}
3128
2614
}
3129
2615
3130
ret = lower_privileges_permanently();
3131
if(ret != 0){
3132
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
3133
2618
perror_plus("Failed to lower privileges permanently");
3134
2619
}
3135
2620
}
3137
2622
free(interfaces_to_take_down);
3138
2623
free(interfaces_hooks);
3139
2624
3140
void clean_dir_at(int base, const char * const dirname,
3141
uintmax_t level){
3142
struct dirent **direntries = NULL;
3143
int dret;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3145
O_RDONLY
3146
| O_NOFOLLOW
3147
| O_DIRECTORY
3148
| O_PATH));
3149
if(dir_fd == -1){
3150
perror_plus("open");
3151
return;
3152
}
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3157
if(debug){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3160
}
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3162
if(dret == -1){
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3165
AT_REMOVEDIR);
3166
}
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3172
dret = 0;
3173
}
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3177
}
3178
}
3179
free(direntries[i]);
3180
}
3181
3182
/* need to clean even if 0 because man page doesn't specify */
3183
free(direntries);
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3187
}
3188
} else {
3189
perror_plus("scandirat");
3190
}
3191
close(dir_fd);
3192
}
3193
3194
2625
/* Removes the GPGME temp directory and all files inside */
3195
2626
if(tempdir != NULL){
3196
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
}
3197
2659
}
3198
2660
3199
2661
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0