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- Committer: Teddy Hogeborn
- Date: 2014-03-23 20:48:58 UTC
- Revision ID: teddy@recompile.se-20140323204858-l1x3aiick21oog4y
Improve error message when working around Debian bug #633582.
* plugins-runner.c (main): Improve error message when failing to work
around Debian bug #633582. Also simplify
code to always use execve().
* plugins-runner.c (main): Improve error message when failing to work
around Debian bug #633582. Also simplify
code to always use execve().
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
143
136
144
137
bool debug = false;
145
138
static const char mandos_protocol_version[] = "1";
146
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
148
141
static const char sys_class_net[] = "/sys/class/net";
149
142
char *connect_to = NULL;
150
143
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
144
uid_t uid = 65534;
153
145
gid_t gid = 65534;
154
146
240
232
.af = af };
241
233
if(new_server->ip == NULL){
242
234
perror_plus("strdup");
243
free(new_server);
244
235
return false;
245
236
}
246
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
238
if(ret == -1){
248
239
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
240
return false;
259
241
}
260
242
/* Special case of first server */
310
292
gpgme_strsource(rc), gpgme_strerror(rc));
311
293
return false;
312
294
}
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
295
389
ret = close(fd);
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
390
297
if(ret == -1){
391
298
perror_plus("close");
392
299
}
431
338
/* Create new GPGME "context" */
432
339
rc = gpgme_new(&(mc->ctx));
433
340
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
436
344
return false;
437
345
}
438
346
474
382
/* Create new empty GPGME data buffer for the plaintext */
475
383
rc = gpgme_data_new(&dh_plain);
476
384
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
478
387
gpgme_strsource(rc), gpgme_strerror(rc));
479
388
gpgme_data_release(dh_crypto);
480
389
return -1;
493
402
if(result == NULL){
494
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
495
404
} 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");
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
502
409
if(result->file_name != NULL){
503
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
504
411
}
574
481
return plaintext_length;
575
482
}
576
483
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
484
__attribute__((warn_unused_result))
585
485
static const char *safer_gnutls_strerror(int value){
586
486
const char *ret = gnutls_strerror(value);
587
return safe_string(ret);
487
if(ret == NULL)
488
ret = "(unknown)";
489
return ret;
588
490
}
589
491
590
492
/* GnuTLS log function callback */
594
496
fprintf_plus(stderr, "GnuTLS: %s", string);
595
497
}
596
498
597
__attribute__((nonnull(1, 2, 4), warn_unused_result))
499
__attribute__((nonnull, warn_unused_result))
598
500
static int init_gnutls_global(const char *pubkeyfilename,
599
501
const char *seckeyfilename,
600
const char *dhparamsfilename,
601
502
mandos_context *mc){
602
503
int ret;
603
unsigned int uret;
604
504
605
505
if(debug){
606
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
607
507
}
608
508
509
ret = gnutls_global_init();
510
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
513
return -1;
514
}
515
609
516
if(debug){
610
517
/* "Use a log level over 10 to enable all debugging options."
611
518
* - GnuTLS manual
619
526
if(ret != GNUTLS_E_SUCCESS){
620
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
621
528
safer_gnutls_strerror(ret));
529
gnutls_global_deinit();
622
530
return -1;
623
531
}
624
532
649
557
safer_gnutls_strerror(ret));
650
558
goto globalfail;
651
559
}
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
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
561
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
564
goto globalfail;
565
}
566
829
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
830
568
831
569
return 0;
833
571
globalfail:
834
572
835
573
gnutls_certificate_free_credentials(mc->cred);
574
gnutls_global_deinit();
836
575
gnutls_dh_params_deinit(mc->dh_params);
837
576
return -1;
838
577
}
890
629
/* ignore client certificate if any. */
891
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
892
631
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
633
893
634
return 0;
894
635
}
895
636
897
638
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
898
639
__attribute__((unused)) const char *txt){}
899
640
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
641
/* Called when a Mandos server is found */
1119
642
__attribute__((nonnull, warn_unused_result))
1120
643
static int start_mandos_communication(const char *ip, in_port_t port,
1131
654
int retval = -1;
1132
655
gnutls_session_t session;
1133
656
int pf; /* Protocol family */
1134
bool route_added = false;
1135
657
1136
658
errno = 0;
1137
659
1159
681
bool match = false;
1160
682
{
1161
683
char *interface = NULL;
1162
while((interface = argz_next(mc->interfaces,
1163
mc->interfaces_size,
1164
interface))){
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
1165
686
if(if_nametoindex(interface) == (unsigned int)if_index){
1166
687
match = true;
1167
688
break;
1196
717
PRIuMAX "\n", ip, (uintmax_t)port);
1197
718
}
1198
719
1199
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
1200
721
if(tcp_sd < 0){
1201
722
int e = errno;
1202
723
perror_plus("socket");
1209
730
goto mandos_end;
1210
731
}
1211
732
733
memset(&to, 0, sizeof(to));
1212
734
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);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1216
737
} 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);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1220
740
}
1221
741
if(ret < 0 ){
1222
742
int e = errno;
1292
812
goto mandos_end;
1293
813
}
1294
814
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;
815
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
818
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
821
}
822
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
828
goto mandos_end;
829
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
1350
834
}
1351
835
1352
836
const char *out = mandos_protocol_version;
1506
990
&decrypted_buffer, mc);
1507
991
if(decrypted_buffer_size >= 0){
1508
992
1509
clearerr(stdout);
1510
993
written = 0;
1511
994
while(written < (size_t) decrypted_buffer_size){
1512
995
if(quit_now){
1528
1011
}
1529
1012
written += (size_t)ret;
1530
1013
}
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
1014
retval = 0;
1542
1015
}
1543
1016
}
1546
1019
1547
1020
mandos_end:
1548
1021
{
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
1022
int e = errno;
1556
1023
free(decrypted_buffer);
1557
1024
free(buffer);
1558
1025
if(tcp_sd >= 0){
1559
ret = close(tcp_sd);
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1560
1027
}
1561
1028
if(ret == -1){
1562
1029
if(e == 0){
1574
1041
return retval;
1575
1042
}
1576
1043
1044
__attribute__((nonnull))
1577
1045
static void resolve_callback(AvahiSServiceResolver *r,
1578
1046
AvahiIfIndex interface,
1579
1047
AvahiProtocol proto,
1596
1064
timed out */
1597
1065
1598
1066
if(quit_now){
1599
avahi_s_service_resolver_free(r);
1600
1067
return;
1601
1068
}
1602
1069
1716
1183
__attribute__((nonnull, warn_unused_result))
1717
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
1185
int ret;
1719
int old_errno;
1186
error_t ret_errno;
1720
1187
1721
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1722
1189
if(s < 0){
1723
old_errno = errno;
1190
ret_errno = errno;
1724
1191
perror_plus("socket");
1725
errno = old_errno;
1192
errno = ret_errno;
1726
1193
return false;
1727
1194
}
1728
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1729
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1195
strcpy(ifr->ifr_name, ifname);
1730
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
1197
if(ret == -1){
1732
1198
if(debug){
1733
old_errno = errno;
1199
ret_errno = errno;
1734
1200
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;
1201
errno = ret_errno;
1741
1202
}
1742
1203
return false;
1743
1204
}
1744
if((close(s) == -1) and debug){
1745
old_errno = errno;
1746
perror_plus("close");
1747
errno = old_errno;
1748
}
1749
1205
return true;
1750
1206
}
1751
1207
1879
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1880
1336
"abcdefghijklmnopqrstuvwxyz"
1881
1337
"0123456789"
1882
"_.-");
1338
"_-");
1883
1339
if((direntry->d_name)[sret] != '\0'){
1884
1340
/* Contains non-allowed characters */
1885
1341
if(debug){
1889
1345
return 0;
1890
1346
}
1891
1347
1892
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1893
1356
if(ret == -1){
1894
1357
if(debug){
1895
1358
perror_plus("Could not stat hook");
1993
1456
}
1994
1457
}
1995
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1996
1515
__attribute__((nonnull))
1997
1516
void run_network_hooks(const char *mode, const char *interface,
1998
1517
const float delay){
1999
struct dirent **direntries = NULL;
2000
if(hookdir_fd == -1){
2001
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2002
| O_CLOEXEC);
2003
if(hookdir_fd == -1){
2004
if(errno == ENOENT){
2005
if(debug){
2006
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2007
" found\n", hookdir);
2008
}
2009
} else {
2010
perror_plus("open");
2011
}
2012
return;
2013
}
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
}
2020
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2021
runnable_hook, alphasort);
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
2022
1521
if(numhooks == -1){
2023
perror_plus("scandir");
2024
close(devnull);
2025
return;
2026
}
2027
struct dirent *direntry;
2028
int ret;
2029
for(int i = 0; i < numhooks; i++){
2030
direntry = direntries[i];
2031
if(debug){
2032
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2033
direntry->d_name);
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
2034
1529
}
2035
pid_t hook_pid = fork();
2036
if(hook_pid == 0){
2037
/* Child */
2038
/* Raise privileges */
2039
errno = raise_privileges_permanently();
2040
if(errno != 0){
2041
perror_plus("Failed to raise privileges");
2042
_exit(EX_NOPERM);
2043
}
2044
/* Set group */
2045
errno = 0;
2046
ret = setgid(0);
2047
if(ret == -1){
2048
perror_plus("setgid");
2049
_exit(EX_NOPERM);
2050
}
2051
/* Reset supplementary groups */
2052
errno = 0;
2053
ret = setgroups(0, NULL);
2054
if(ret == -1){
2055
perror_plus("setgroups");
2056
_exit(EX_NOPERM);
2057
}
2058
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2059
if(ret == -1){
2060
perror_plus("setenv");
2061
_exit(EX_OSERR);
2062
}
2063
ret = setenv("DEVICE", interface, 1);
2064
if(ret == -1){
2065
perror_plus("setenv");
2066
_exit(EX_OSERR);
2067
}
2068
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2069
if(ret == -1){
2070
perror_plus("setenv");
2071
_exit(EX_OSERR);
2072
}
2073
ret = setenv("MODE", mode, 1);
2074
if(ret == -1){
2075
perror_plus("setenv");
2076
_exit(EX_OSERR);
2077
}
2078
char *delaystring;
2079
ret = asprintf(&delaystring, "%f", (double)delay);
2080
if(ret == -1){
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
2081
1539
perror_plus("asprintf");
2082
_exit(EX_OSERR);
2083
}
2084
ret = setenv("DELAY", delaystring, 1);
2085
if(ret == -1){
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
2086
1615
free(delaystring);
2087
perror_plus("setenv");
2088
_exit(EX_OSERR);
2089
}
2090
free(delaystring);
2091
if(connect_to != NULL){
2092
ret = setenv("CONNECT", connect_to, 1);
2093
if(ret == -1){
2094
perror_plus("setenv");
2095
_exit(EX_OSERR);
2096
}
2097
}
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){
2126
perror_plus("fexecve");
2127
_exit(EXIT_FAILURE);
2128
}
2129
} else {
2130
if(hook_pid == -1){
2131
perror_plus("fork");
2132
free(direntry);
2133
continue;
2134
}
2135
int status;
2136
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2137
perror_plus("waitpid");
2138
free(direntry);
2139
continue;
2140
}
2141
if(WIFEXITED(status)){
2142
if(WEXITSTATUS(status) != 0){
2143
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2144
" with status %d\n", direntry->d_name,
2145
WEXITSTATUS(status));
2146
free(direntry);
2147
continue;
2148
}
2149
} else if(WIFSIGNALED(status)){
2150
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2151
" signal %d\n", direntry->d_name,
2152
WTERMSIG(status));
2153
free(direntry);
2154
continue;
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
2155
1627
} else {
2156
fprintf_plus(stderr, "Warning: network hook \"%s\""
2157
" crashed\n", direntry->d_name);
2158
free(direntry);
2159
continue;
2160
}
2161
}
2162
if(debug){
2163
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2164
direntry->d_name);
2165
}
2166
free(direntry);
2167
}
2168
free(direntries);
2169
if(close(hookdir_fd) == -1){
2170
perror_plus("close");
2171
} else {
2172
hookdir_fd = -1;
2173
}
2174
close(devnull);
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
2175
1663
}
2176
1664
2177
1665
__attribute__((nonnull, warn_unused_result))
2178
int bring_up_interface(const char *const interface,
2179
const float delay){
2180
int old_errno = errno;
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
2181
1669
int ret;
2182
1670
struct ifreq network;
2183
1671
unsigned int if_index = if_nametoindex(interface);
2193
1681
}
2194
1682
2195
1683
if(not interface_is_up(interface)){
2196
int ret_errno = 0;
2197
int ioctl_errno = 0;
1684
error_t ret_errno = 0, ioctl_errno = 0;
2198
1685
if(not get_flags(interface, &network)){
2199
1686
ret_errno = errno;
2200
1687
fprintf_plus(stderr, "Failed to get flags for interface "
2213
1700
}
2214
1701
2215
1702
if(quit_now){
2216
ret = close(sd);
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2217
1704
if(ret == -1){
2218
1705
perror_plus("close");
2219
1706
}
2228
1715
2229
1716
/* Raise privileges */
2230
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
2231
1719
if(ret_errno != 0){
2232
errno = ret_errno;
2233
1720
perror_plus("Failed to raise privileges");
2234
1721
}
2235
2236
1722
#ifdef __linux__
2237
1723
int ret_linux;
2238
bool restore_loglevel = false;
2239
1724
if(ret_errno == 0){
2240
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2241
1726
messages about the network interface to mess up the prompt */
2269
1754
}
2270
1755
2271
1756
/* Close the socket */
2272
ret = close(sd);
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2273
1758
if(ret == -1){
2274
1759
perror_plus("close");
2275
1760
}
2287
1772
2288
1773
/* Sleep checking until interface is running.
2289
1774
Check every 0.25s, up to total time of delay */
2290
for(int i = 0; i < delay * 4; i++){
1775
for(int i=0; i < delay * 4; i++){
2291
1776
if(interface_is_running(interface)){
2292
1777
break;
2293
1778
}
2303
1788
}
2304
1789
2305
1790
__attribute__((nonnull, warn_unused_result))
2306
int take_down_interface(const char *const interface){
2307
int old_errno = errno;
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
2308
1793
struct ifreq network;
2309
1794
unsigned int if_index = if_nametoindex(interface);
2310
1795
if(if_index == 0){
2313
1798
return ENXIO;
2314
1799
}
2315
1800
if(interface_is_up(interface)){
2316
int ret_errno = 0;
2317
int ioctl_errno = 0;
1801
error_t ret_errno = 0, ioctl_errno = 0;
2318
1802
if(not get_flags(interface, &network) and debug){
2319
1803
ret_errno = errno;
2320
1804
fprintf_plus(stderr, "Failed to get flags for interface "
2340
1824
/* Raise privileges */
2341
1825
ret_errno = raise_privileges();
2342
1826
if(ret_errno != 0){
2343
errno = ret_errno;
2344
1827
perror_plus("Failed to raise privileges");
2345
1828
}
2346
2347
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2348
1830
ioctl_errno = errno;
2349
1831
2358
1840
}
2359
1841
2360
1842
/* Close the socket */
2361
int ret = close(sd);
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2362
1844
if(ret == -1){
2363
1845
perror_plus("close");
2364
1846
}
2379
1861
}
2380
1862
2381
1863
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 };
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
2387
1868
AvahiSServiceBrowser *sb = NULL;
2388
1869
error_t ret_errno;
2389
1870
int ret;
2398
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2399
1880
const char *seckey = PATHDIR "/" SECKEY;
2400
1881
const char *pubkey = PATHDIR "/" PUBKEY;
2401
const char *dh_params_file = NULL;
2402
1882
char *interfaces_hooks = NULL;
2403
1883
2404
1884
bool gnutls_initialized = false;
2457
1937
.doc = "Bit length of the prime number used in the"
2458
1938
" Diffie-Hellman key exchange",
2459
1939
.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
1940
{ .name = "priority", .key = 130,
2466
1941
.arg = "STRING",
2467
1942
.doc = "GnuTLS priority string for the TLS handshake",
2522
1997
}
2523
1998
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2524
1999
break;
2525
case 134: /* --dh-params */
2526
dh_params_file = arg;
2527
break;
2528
2000
case 130: /* --priority */
2529
2001
mc.priority = arg;
2530
2002
break;
2570
2042
.args_doc = "",
2571
2043
.doc = "Mandos client -- Get and decrypt"
2572
2044
" 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){
2045
ret = argp_parse(&argp, argc, argv,
2046
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2047
switch(ret){
2576
2048
case 0:
2577
2049
break;
2578
2050
case ENOMEM:
2579
2051
default:
2580
errno = ret_errno;
2052
errno = ret;
2581
2053
perror_plus("argp_parse");
2582
2054
exitcode = EX_OSERR;
2583
2055
goto end;
2586
2058
goto end;
2587
2059
}
2588
2060
}
2589
2061
2590
2062
{
2591
2063
/* Work around Debian bug #633582:
2592
<https://bugs.debian.org/633582> */
2064
<http://bugs.debian.org/633582> */
2593
2065
2594
2066
/* Re-raise privileges */
2595
ret = raise_privileges();
2596
if(ret != 0){
2597
errno = ret;
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2598
2070
perror_plus("Failed to raise privileges");
2599
2071
} else {
2600
2072
struct stat st;
2616
2088
}
2617
2089
}
2618
2090
}
2619
close(seckey_fd);
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2620
2092
}
2621
2093
}
2622
2094
2623
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2624
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2625
2097
if(pubkey_fd == -1){
2637
2109
}
2638
2110
}
2639
2111
}
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
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2666
2116
/* Lower privileges */
2667
ret = lower_privileges();
2668
if(ret != 0){
2669
errno = ret;
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2670
2120
perror_plus("Failed to lower privileges");
2671
2121
}
2672
2122
}
2785
2235
2786
2236
/* If no interfaces were specified, make a list */
2787
2237
if(mc.interfaces == NULL){
2788
struct dirent **direntries = NULL;
2238
struct dirent **direntries;
2789
2239
/* Look for any good interfaces */
2790
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2791
2241
alphasort);
2797
2247
if(ret_errno != 0){
2798
2248
errno = ret_errno;
2799
2249
perror_plus("argz_add");
2800
free(direntries[i]);
2801
2250
continue;
2802
2251
}
2803
2252
if(debug){
2804
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2805
2254
direntries[i]->d_name);
2806
2255
}
2807
free(direntries[i]);
2808
2256
}
2809
2257
free(direntries);
2810
2258
} else {
2811
if(ret == 0){
2812
free(direntries);
2813
}
2259
free(direntries);
2814
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2815
2261
exitcode = EXIT_FAILURE;
2816
2262
goto end;
2842
2288
errno = bring_up_interface(interface, delay);
2843
2289
if(not interface_was_up){
2844
2290
if(errno != 0){
2845
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2846
" %s\n", interface, strerror(errno));
2291
perror_plus("Failed to bring up interface");
2847
2292
} else {
2848
2293
errno = argz_add(&interfaces_to_take_down,
2849
2294
&interfaces_to_take_down_size,
2872
2317
goto end;
2873
2318
}
2874
2319
2875
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2876
2321
if(ret == -1){
2877
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
2878
2323
exitcode = EX_UNAVAILABLE;
3000
2445
3001
2446
/* Allocate a new server */
3002
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3003
&config, NULL, NULL, &ret);
2448
&config, NULL, NULL, &ret_errno);
3004
2449
3005
2450
/* Free the Avahi configuration data */
3006
2451
avahi_server_config_free(&config);
3009
2454
/* Check if creating the Avahi server object succeeded */
3010
2455
if(mc.server == NULL){
3011
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3012
avahi_strerror(ret));
2457
avahi_strerror(ret_errno));
3013
2458
exitcode = EX_UNAVAILABLE;
3014
2459
goto end;
3015
2460
}
3039
2484
if(debug){
3040
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
3041
2486
}
3042
2487
3043
2488
ret = avahi_loop_with_timeout(simple_poll,
3044
2489
(int)(retry_interval * 1000), &mc);
3045
2490
if(debug){
3050
2495
end:
3051
2496
3052
2497
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
}
2498
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3060
2499
}
3061
2500
3062
2501
/* Cleanup things */
3073
2512
3074
2513
if(gnutls_initialized){
3075
2514
gnutls_certificate_free_credentials(mc.cred);
2515
gnutls_global_deinit();
3076
2516
gnutls_dh_params_deinit(mc.dh_params);
3077
2517
}
3078
2518
3086
2526
mc.current_server->prev->next = NULL;
3087
2527
while(mc.current_server != NULL){
3088
2528
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
2529
free(mc.current_server);
3098
2530
mc.current_server = next;
3099
2531
}
3101
2533
3102
2534
/* Re-raise privileges */
3103
2535
{
3104
ret = raise_privileges();
3105
if(ret != 0){
3106
errno = ret;
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
3107
2538
perror_plus("Failed to raise privileges");
3108
2539
} else {
3109
2540
3114
2545
/* Take down the network interfaces which were brought up */
3115
2546
{
3116
2547
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;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
3123
2554
perror_plus("Failed to take down interface");
3124
2555
}
3125
2556
}
3129
2560
}
3130
2561
}
3131
2562
}
3132
3133
ret = lower_privileges_permanently();
3134
if(ret != 0){
3135
errno = ret;
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
3136
2565
perror_plus("Failed to lower privileges permanently");
3137
2566
}
3138
2567
}
3140
2569
free(interfaces_to_take_down);
3141
2570
free(interfaces_hooks);
3142
2571
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
2572
/* Removes the GPGME temp directory and all files inside */
3198
2573
if(tempdir != NULL){
3199
clean_dir_at(-1, tempdir, 0);
2574
struct dirent **direntries = NULL;
2575
struct dirent *direntry = NULL;
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2577
alphasort);
2578
if(numentries > 0){
2579
for(int i = 0; i < numentries; i++){
2580
direntry = direntries[i];
2581
char *fullname = NULL;
2582
ret = asprintf(&fullname, "%s/%s", tempdir,
2583
direntry->d_name);
2584
if(ret < 0){
2585
perror_plus("asprintf");
2586
continue;
2587
}
2588
ret = remove(fullname);
2589
if(ret == -1){
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
2592
}
2593
free(fullname);
2594
}
2595
}
2596
2597
/* need to clean even if 0 because man page doesn't specify */
2598
free(direntries);
2599
if(numentries == -1){
2600
perror_plus("scandir");
2601
}
2602
ret = rmdir(tempdir);
2603
if(ret == -1 and errno != ENOENT){
2604
perror_plus("rmdir");
2605
}
3200
2606
}
3201
2607
3202
2608
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0