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- Committer: Teddy Hogeborn
- Date: 2015-07-12 01:25:14 UTC
- Revision ID: teddy@recompile.se-20150712012514-x4wdgi1hz46h0apg
debian/mandos-client.README.Debian: Document the dhparams.pem file.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- dracut-module
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2020 Teddy Hogeborn
13
* Copyright © 2008-2020 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
123
117
gnutls_*
124
118
init_gnutls_session(),
125
119
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
120
#include <gnutls/openpgp.h>
128
121
/* gnutls_certificate_set_openpgp_key_file(),
129
122
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
135
123
136
124
/* GPGME */
137
125
#include <gpgme.h> /* All GPGME types, constants and
145
133
#define PATHDIR "/conf/conf.d/mandos"
146
134
#define SECKEY "seckey.txt"
147
135
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
137
152
138
bool debug = false;
280
266
return true;
281
267
}
282
268
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
335
269
/*
336
270
* Initialize GPGME.
337
271
*/
357
291
return false;
358
292
}
359
293
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
401
}
402
ret = lower_privileges();
403
if(ret != 0){
404
errno = ret;
405
perror_plus("Failed to lower privileges");
406
}
407
} while(false);
408
409
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
410
295
if(rc != GPG_ERR_NO_ERROR){
411
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
419
304
gpgme_strsource(rc), gpgme_strerror(rc));
420
305
return false;
421
306
}
422
{
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
429
fprintf_plus(stderr,
430
"The total number of considered keys: %d\n",
431
import_result->considered);
432
fprintf_plus(stderr,
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
435
fprintf_plus(stderr,
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
450
fprintf_plus(stderr,
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
453
fprintf_plus(stderr,
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
456
fprintf_plus(stderr,
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
466
import_status->fpr);
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
471
}
472
fprintf_plus(stderr, "Key status:\n");
473
fprintf_plus(stderr,
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
477
fprintf_plus(stderr,
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
481
fprintf_plus(stderr,
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
485
fprintf_plus(stderr,
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
489
fprintf_plus(stderr,
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
493
}
494
return false;
495
}
496
}
497
307
498
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
309
if(ret == -1){
500
310
perror_plus("close");
501
311
}
540
350
/* Create new GPGME "context" */
541
351
rc = gpgme_new(&(mc->ctx));
542
352
if(rc != GPG_ERR_NO_ERROR){
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
545
356
return false;
546
357
}
547
358
583
394
/* Create new empty GPGME data buffer for the plaintext */
584
395
rc = gpgme_data_new(&dh_plain);
585
396
if(rc != GPG_ERR_NO_ERROR){
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
587
399
gpgme_strsource(rc), gpgme_strerror(rc));
588
400
gpgme_data_release(dh_crypto);
589
401
return -1;
602
414
if(result == NULL){
603
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
604
416
} else {
605
if(result->unsupported_algorithm != NULL) {
606
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
607
result->unsupported_algorithm);
608
}
609
fprintf_plus(stderr, "Wrong key usage: %s\n",
610
result->wrong_key_usage ? "Yes" : "No");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
611
421
if(result->file_name != NULL){
612
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
613
423
}
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
617
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
620
431
fprintf_plus(stderr, "Secret key available: %s\n",
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
622
435
}
623
436
}
624
437
}
700
513
fprintf_plus(stderr, "GnuTLS: %s", string);
701
514
}
702
515
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
704
517
static int init_gnutls_global(const char *pubkeyfilename,
705
518
const char *seckeyfilename,
706
519
const char *dhparamsfilename,
707
520
mandos_context *mc){
708
521
int ret;
522
unsigned int uret;
709
523
710
524
if(debug){
711
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
712
526
}
713
527
528
ret = gnutls_global_init();
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
532
return -1;
533
}
534
714
535
if(debug){
715
536
/* "Use a log level over 10 to enable all debugging options."
716
537
* - GnuTLS manual
724
545
if(ret != GNUTLS_E_SUCCESS){
725
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
727
549
return -1;
728
550
}
729
551
730
552
if(debug){
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
733
555
pubkeyfilename,
734
556
seckeyfilename);
735
557
}
736
558
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
741
NULL, /* pass */
742
/* key_usage */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
744
NULL, /* names */
745
0, /* names_length */
746
/* privkey_flags */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
750
559
ret = gnutls_certificate_set_openpgp_key_file
751
560
(mc->cred, pubkeyfilename, seckeyfilename,
752
561
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
756
562
if(ret != GNUTLS_E_SUCCESS){
757
563
fprintf_plus(stderr,
758
"Error[%d] while reading the key pair ('%s',"
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
567
safer_gnutls_strerror(ret));
809
615
}
810
616
params.size += (unsigned int)bytes_read;
811
617
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
618
if(params.data == NULL){
817
619
dhparamsfilename = NULL;
818
620
}
827
629
safer_gnutls_strerror(ret));
828
630
dhparamsfilename = NULL;
829
631
}
830
free(params.data);
831
632
} while(false);
832
633
}
833
634
if(dhparamsfilename == NULL){
834
635
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
636
/* Find out the optimal number of DH bits */
837
637
/* Try to read the private key file */
838
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
918
718
}
919
719
}
920
720
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
722
if(uret != 0){
923
723
mc->dh_bits = uret;
924
724
if(debug){
936
736
safer_gnutls_strerror(ret));
937
737
goto globalfail;
938
738
}
939
#endif
940
} else { /* dh_bits != 0 */
941
if(debug){
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
943
mc->dh_bits);
944
}
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
950
goto globalfail;
951
}
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
953
749
}
954
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
955
752
956
753
return 0;
957
754
958
755
globalfail:
959
756
960
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_global_deinit();
961
759
gnutls_dh_params_deinit(mc->dh_params);
962
760
return -1;
963
761
}
968
766
int ret;
969
767
/* GnuTLS session creation */
970
768
do {
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
973
| GNUTLS_NO_TICKETS
974
#endif
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
977
#endif
978
));
769
ret = gnutls_init(session, GNUTLS_SERVER);
979
770
if(quit_now){
980
771
return -1;
981
772
}
1029
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1030
821
__attribute__((unused)) const char *txt){}
1031
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
1032
875
/* Helper function to add_local_route() and delete_local_route() */
1033
876
__attribute__((nonnull, warn_unused_result))
1034
877
static bool add_delete_local_route(const bool add,
1073
916
ret = setgid(0);
1074
917
if(ret == -1){
1075
918
perror_plus("setgid");
1076
close(devnull);
1077
919
_exit(EX_NOPERM);
1078
920
}
1079
921
/* Reset supplementary groups */
1081
923
ret = setgroups(0, NULL);
1082
924
if(ret == -1){
1083
925
perror_plus("setgroups");
1084
close(devnull);
1085
926
_exit(EX_NOPERM);
1086
927
}
1087
928
}
1088
929
ret = dup2(devnull, STDIN_FILENO);
1089
930
if(ret == -1){
1090
931
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
932
_exit(EX_OSERR);
1093
933
}
1094
ret = close(devnull);
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1095
935
if(ret == -1){
1096
936
perror_plus("close");
937
_exit(EX_OSERR);
1097
938
}
1098
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
940
if(ret == -1){
1113
954
helper, O_RDONLY));
1114
955
if(helper_fd == -1){
1115
956
perror_plus("openat");
1116
close(helperdir_fd);
1117
957
_exit(EX_UNAVAILABLE);
1118
958
}
1119
close(helperdir_fd);
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
1120
960
#ifdef __GNUC__
1121
961
#pragma GCC diagnostic push
1122
962
#pragma GCC diagnostic ignored "-Wcast-qual"
1134
974
}
1135
975
if(pid == -1){
1136
976
perror_plus("fork");
1137
close(devnull);
1138
977
return false;
1139
978
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
979
int status;
1145
980
pid_t pret = -1;
1146
981
errno = 0;
1246
1081
bool match = false;
1247
1082
{
1248
1083
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1252
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
1087
match = true;
1254
1088
break;
1296
1130
goto mandos_end;
1297
1131
}
1298
1132
1133
memset(&to, 0, sizeof(to));
1299
1134
if(af == AF_INET6){
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1303
1137
} else { /* IPv4 */
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1307
1140
}
1308
1141
if(ret < 0 ){
1309
1142
int e = errno;
1388
1221
sizeof(struct sockaddr_in));
1389
1222
}
1390
1223
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1224
if(errno == ENETUNREACH
1392
1225
and if_index != AVAHI_IF_UNSPEC
1393
1226
and connect_to == NULL
1394
1227
and not route_added and
1407
1240
with an explicit route added with the server's address.
1408
1241
1409
1242
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
1244
https://bugs.debian.org/587961
1412
1245
*/
1413
1246
if(debug){
1593
1426
&decrypted_buffer, mc);
1594
1427
if(decrypted_buffer_size >= 0){
1595
1428
1596
clearerr(stdout);
1597
1429
written = 0;
1598
1430
while(written < (size_t) decrypted_buffer_size){
1599
1431
if(quit_now){
1615
1447
}
1616
1448
written += (size_t)ret;
1617
1449
}
1618
ret = fflush(stdout);
1619
if(ret != 0){
1620
int e = errno;
1621
if(debug){
1622
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1623
strerror(errno));
1624
}
1625
errno = e;
1626
goto mandos_end;
1627
}
1628
1450
retval = 0;
1629
1451
}
1630
1452
}
1643
1465
free(decrypted_buffer);
1644
1466
free(buffer);
1645
1467
if(tcp_sd >= 0){
1646
ret = close(tcp_sd);
1468
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
1469
}
1648
1470
if(ret == -1){
1649
1471
if(e == 0){
1661
1483
return retval;
1662
1484
}
1663
1485
1486
__attribute__((nonnull))
1664
1487
static void resolve_callback(AvahiSServiceResolver *r,
1665
1488
AvahiIfIndex interface,
1666
1489
AvahiProtocol proto,
1803
1626
__attribute__((nonnull, warn_unused_result))
1804
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1805
1628
int ret;
1806
int old_errno;
1629
error_t ret_errno;
1807
1630
1808
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1809
1632
if(s < 0){
1810
old_errno = errno;
1633
ret_errno = errno;
1811
1634
perror_plus("socket");
1812
errno = old_errno;
1635
errno = ret_errno;
1813
1636
return false;
1814
1637
}
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1638
strcpy(ifr->ifr_name, ifname);
1817
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1818
1640
if(ret == -1){
1819
1641
if(debug){
1820
old_errno = errno;
1642
ret_errno = errno;
1821
1643
perror_plus("ioctl SIOCGIFFLAGS");
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1644
errno = ret_errno;
1828
1645
}
1829
1646
return false;
1830
1647
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1836
1648
return true;
1837
1649
}
1838
1650
2099
1911
return;
2100
1912
}
2101
1913
}
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2103
if(devnull == -1){
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2105
return;
2106
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
2107
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
2109
1926
if(numhooks == -1){
2110
1927
perror_plus("scandir");
2111
close(devnull);
2112
1928
return;
2113
1929
}
2114
1930
struct dirent *direntry;
2115
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
2116
1937
for(int i = 0; i < numhooks; i++){
2117
1938
direntry = direntries[i];
2118
1939
if(debug){
2189
2010
perror_plus("openat");
2190
2011
_exit(EXIT_FAILURE);
2191
2012
}
2192
if(close(hookdir_fd) == -1){
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2193
2014
perror_plus("close");
2194
2015
_exit(EXIT_FAILURE);
2195
2016
}
2198
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
2020
_exit(EX_OSERR);
2200
2021
}
2201
ret = close(devnull);
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2202
2023
if(ret == -1){
2203
2024
perror_plus("close");
2204
2025
_exit(EX_OSERR);
2253
2074
free(direntry);
2254
2075
}
2255
2076
free(direntries);
2256
if(close(hookdir_fd) == -1){
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2257
2078
perror_plus("close");
2258
2079
} else {
2259
2080
hookdir_fd = -1;
2262
2083
}
2263
2084
2264
2085
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2268
2089
int ret;
2269
2090
struct ifreq network;
2270
2091
unsigned int if_index = if_nametoindex(interface);
2280
2101
}
2281
2102
2282
2103
if(not interface_is_up(interface)){
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
2104
error_t ret_errno = 0, ioctl_errno = 0;
2285
2105
if(not get_flags(interface, &network)){
2286
2106
ret_errno = errno;
2287
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2300
2120
}
2301
2121
2302
2122
if(quit_now){
2303
ret = close(sd);
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2304
2124
if(ret == -1){
2305
2125
perror_plus("close");
2306
2126
}
2356
2176
}
2357
2177
2358
2178
/* Close the socket */
2359
ret = close(sd);
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2360
2180
if(ret == -1){
2361
2181
perror_plus("close");
2362
2182
}
2374
2194
2375
2195
/* Sleep checking until interface is running.
2376
2196
Check every 0.25s, up to total time of delay */
2377
for(int i = 0; i < delay * 4; i++){
2197
for(int i=0; i < delay * 4; i++){
2378
2198
if(interface_is_running(interface)){
2379
2199
break;
2380
2200
}
2390
2210
}
2391
2211
2392
2212
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2395
2215
struct ifreq network;
2396
2216
unsigned int if_index = if_nametoindex(interface);
2397
2217
if(if_index == 0){
2400
2220
return ENXIO;
2401
2221
}
2402
2222
if(interface_is_up(interface)){
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
2223
error_t ret_errno = 0, ioctl_errno = 0;
2405
2224
if(not get_flags(interface, &network) and debug){
2406
2225
ret_errno = errno;
2407
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2445
2264
}
2446
2265
2447
2266
/* Close the socket */
2448
int ret = close(sd);
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2449
2268
if(ret == -1){
2450
2269
perror_plus("close");
2451
2270
}
2467
2286
2468
2287
int main(int argc, char *argv[]){
2469
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2473
":%PROFILE_ULTRA",
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
#else
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
#endif
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
2482
2292
AvahiSServiceBrowser *sb = NULL;
2483
2293
error_t ret_errno;
2484
2294
int ret;
2493
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
2304
const char *seckey = PATHDIR "/" SECKEY;
2495
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2499
#endif
2500
2306
const char *dh_params_file = NULL;
2501
2307
char *interfaces_hooks = NULL;
2502
2308
2550
2356
{ .name = "pubkey", .key = 'p',
2551
2357
.arg = "FILE",
2552
2358
.doc = "OpenPGP public key file base name",
2553
.group = 1 },
2554
{ .name = "tls-privkey", .key = 't',
2555
.arg = "FILE",
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2558
#else
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2560
#endif
2561
.group = 1 },
2562
{ .name = "tls-pubkey", .key = 'T',
2563
.arg = "FILE",
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2566
#else
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2568
#endif
2569
.group = 1 },
2359
.group = 2 },
2570
2360
{ .name = "dh-bits", .key = 129,
2571
2361
.arg = "BITS",
2572
2362
.doc = "Bit length of the prime number used in the"
2628
2418
case 'p': /* --pubkey */
2629
2419
pubkey = arg;
2630
2420
break;
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2633
tls_privkey = arg;
2634
#endif
2635
break;
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2638
tls_pubkey = arg;
2639
#endif
2640
break;
2641
2421
case 129: /* --dh-bits */
2642
2422
errno = 0;
2643
2423
tmpmax = strtoimax(arg, &tmp, 10);
2678
2458
argp_state_help(state, state->out_stream,
2679
2459
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
2460
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
2461
case -3: /* --usage */
2683
2462
argp_state_help(state, state->out_stream,
2684
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
2464
case 'V': /* --version */
2687
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
2466
exit(argp_err_exit_status);
2697
2475
.args_doc = "",
2698
2476
.doc = "Mandos client -- Get and decrypt"
2699
2477
" passwords from a Mandos server" };
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
2478
ret = argp_parse(&argp, argc, argv,
2479
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2480
switch(ret){
2703
2481
case 0:
2704
2482
break;
2705
2483
case ENOMEM:
2706
2484
default:
2707
errno = ret_errno;
2485
errno = ret;
2708
2486
perror_plus("argp_parse");
2709
2487
exitcode = EX_OSERR;
2710
2488
goto end;
2716
2494
2717
2495
{
2718
2496
/* Work around Debian bug #633582:
2719
<https://bugs.debian.org/633582> */
2497
<http://bugs.debian.org/633582> */
2720
2498
2721
2499
/* Re-raise privileges */
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2725
2503
perror_plus("Failed to raise privileges");
2726
2504
} else {
2727
2505
struct stat st;
2743
2521
}
2744
2522
}
2745
2523
}
2746
close(seckey_fd);
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
2525
}
2748
2526
}
2749
2527
2764
2542
}
2765
2543
}
2766
2544
}
2767
close(pubkey_fd);
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2768
2546
}
2769
2547
}
2770
2548
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2549
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
2550
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
2551
if(dhparams_fd == -1){
2775
2552
perror_plus("open");
2786
2563
}
2787
2564
}
2788
2565
}
2789
close(dhparams_fd);
2566
TEMP_FAILURE_RETRY(close(dhparams_fd));
2790
2567
}
2791
2568
}
2792
2569
2793
2570
/* Lower privileges */
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2571
ret_errno = lower_privileges();
2572
if(ret_errno != 0){
2573
errno = ret_errno;
2797
2574
perror_plus("Failed to lower privileges");
2798
2575
}
2799
2576
}
2999
2776
goto end;
3000
2777
}
3001
2778
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3006
#else
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3008
#endif
3009
2780
if(ret == -1){
3010
2781
fprintf_plus(stderr, "init_gnutls_global failed\n");
3011
2782
exitcode = EX_UNAVAILABLE;
3133
2904
3134
2905
/* Allocate a new server */
3135
2906
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3136
&config, NULL, NULL, &ret);
2907
&config, NULL, NULL, &ret_errno);
3137
2908
3138
2909
/* Free the Avahi configuration data */
3139
2910
avahi_server_config_free(&config);
3142
2913
/* Check if creating the Avahi server object succeeded */
3143
2914
if(mc.server == NULL){
3144
2915
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3145
avahi_strerror(ret));
2916
avahi_strerror(ret_errno));
3146
2917
exitcode = EX_UNAVAILABLE;
3147
2918
goto end;
3148
2919
}
3183
2954
end:
3184
2955
3185
2956
if(debug){
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3190
} else {
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3192
}
2957
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
2958
}
3194
2959
3195
2960
/* Cleanup things */
3206
2971
3207
2972
if(gnutls_initialized){
3208
2973
gnutls_certificate_free_credentials(mc.cred);
2974
gnutls_global_deinit();
3209
2975
gnutls_dh_params_deinit(mc.dh_params);
3210
2976
}
3211
2977
3234
3000
3235
3001
/* Re-raise privileges */
3236
3002
{
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3240
3006
perror_plus("Failed to raise privileges");
3241
3007
} else {
3242
3008
3247
3013
/* Take down the network interfaces which were brought up */
3248
3014
{
3249
3015
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3252
interface))){
3253
ret = take_down_interface(interface);
3254
if(ret != 0){
3255
errno = ret;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3256
3022
perror_plus("Failed to take down interface");
3257
3023
}
3258
3024
}
3263
3029
}
3264
3030
}
3265
3031
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3269
3035
perror_plus("Failed to lower privileges permanently");
3270
3036
}
3271
3037
}
3273
3039
free(interfaces_to_take_down);
3274
3040
free(interfaces_hooks);
3275
3041
3276
void clean_dir_at(int base, const char * const dirname,
3277
uintmax_t level){
3278
struct dirent **direntries = NULL;
3279
int dret;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3281
O_RDONLY
3282
| O_NOFOLLOW
3283
| O_DIRECTORY
3284
| O_PATH));
3285
if(dir_fd == -1){
3286
perror_plus("open");
3287
return;
3288
}
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
3292
for(int i = 0; i < numentries; i++){
3293
if(debug){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3296
}
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3298
if(dret == -1){
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3301
AT_REMOVEDIR);
3302
}
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3308
dret = 0;
3309
}
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3313
}
3314
}
3315
free(direntries[i]);
3316
}
3317
3318
/* need to clean even if 0 because man page doesn't specify */
3319
free(direntries);
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3323
}
3324
} else {
3325
perror_plus("scandirat");
3326
}
3327
close(dir_fd);
3328
}
3329
3330
3042
/* Removes the GPGME temp directory and all files inside */
3331
3043
if(tempdir != NULL){
3332
clean_dir_at(-1, tempdir, 0);
3044
struct dirent **direntries = NULL;
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
3084
}
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
3086
}
3333
3087
}
3334
3088
3335
3089
if(quit_now){
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Version: 2.0.2.dev0