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- Committer: Teddy Hogeborn
- Date: 2020-11-30 09:40:14 UTC
- Revision ID: teddy@recompile.se-20201130094014-33tl5zzswqprc034
Revert commit 1222
- files added:
- bugs.xml
- debian/tests
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
60
inet_pton(), connect(),
59
61
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
61
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
64
*/
63
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
66
strtoimax() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
117
123
gnutls_*
118
124
init_gnutls_session(),
119
125
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
120
127
#include <gnutls/openpgp.h>
121
128
/* gnutls_certificate_set_openpgp_key_file(),
122
129
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
123
135
124
136
/* GPGME */
125
137
#include <gpgme.h> /* All GPGME types, constants and
133
145
#define PATHDIR "/conf/conf.d/mandos"
134
146
#define SECKEY "seckey.txt"
135
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
136
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
151
138
152
bool debug = false;
240
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
255
if(ret == -1){
242
256
perror_plus("clock_gettime");
243
free(new_server->ip);
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
244
265
free(new_server);
245
266
return false;
246
267
}
259
280
return true;
260
281
}
261
282
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
262
335
/*
263
336
* Initialize GPGME.
264
337
*/
284
357
return false;
285
358
}
286
359
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
287
409
rc = gpgme_data_new_from_fd(&pgp_data, fd);
288
410
if(rc != GPG_ERR_NO_ERROR){
289
411
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
419
gpgme_strsource(rc), gpgme_strerror(rc));
298
420
return false;
299
421
}
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
}
300
497
301
ret = (int)TEMP_FAILURE_RETRY(close(fd));
498
ret = close(fd);
302
499
if(ret == -1){
303
500
perror_plus("close");
304
501
}
343
540
/* Create new GPGME "context" */
344
541
rc = gpgme_new(&(mc->ctx));
345
542
if(rc != GPG_ERR_NO_ERROR){
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
349
545
return false;
350
546
}
351
547
387
583
/* Create new empty GPGME data buffer for the plaintext */
388
584
rc = gpgme_data_new(&dh_plain);
389
585
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
392
587
gpgme_strsource(rc), gpgme_strerror(rc));
393
588
gpgme_data_release(dh_crypto);
394
589
return -1;
407
602
if(result == NULL){
408
603
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
409
604
} else {
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
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");
414
611
if(result->file_name != NULL){
415
612
fprintf_plus(stderr, "File name: %s\n", result->file_name);
416
613
}
417
gpgme_recipient_t recipient;
418
recipient = result->recipients;
419
while(recipient != NULL){
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
420
617
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
424
620
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
427
recipient = recipient->next;
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
428
622
}
429
623
}
430
624
}
486
680
return plaintext_length;
487
681
}
488
682
683
__attribute__((warn_unused_result, const))
684
static const char *safe_string(const char *str){
685
if(str == NULL)
686
return "(unknown)";
687
return str;
688
}
689
489
690
__attribute__((warn_unused_result))
490
691
static const char *safer_gnutls_strerror(int value){
491
692
const char *ret = gnutls_strerror(value);
492
if(ret == NULL)
493
ret = "(unknown)";
494
return ret;
693
return safe_string(ret);
495
694
}
496
695
497
696
/* GnuTLS log function callback */
501
700
fprintf_plus(stderr, "GnuTLS: %s", string);
502
701
}
503
702
504
__attribute__((nonnull, warn_unused_result))
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
505
704
static int init_gnutls_global(const char *pubkeyfilename,
506
705
const char *seckeyfilename,
706
const char *dhparamsfilename,
507
707
mandos_context *mc){
508
708
int ret;
509
709
511
711
fprintf_plus(stderr, "Initializing GnuTLS\n");
512
712
}
513
713
514
ret = gnutls_global_init();
515
if(ret != GNUTLS_E_SUCCESS){
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
518
return -1;
519
}
520
521
714
if(debug){
522
715
/* "Use a log level over 10 to enable all debugging options."
523
716
* - GnuTLS manual
531
724
if(ret != GNUTLS_E_SUCCESS){
532
725
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
726
safer_gnutls_strerror(ret));
534
gnutls_global_deinit();
535
727
return -1;
536
728
}
537
729
538
730
if(debug){
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
541
733
pubkeyfilename,
542
734
seckeyfilename);
543
735
}
544
736
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
545
750
ret = gnutls_certificate_set_openpgp_key_file
546
751
(mc->cred, pubkeyfilename, seckeyfilename,
547
752
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
548
756
if(ret != GNUTLS_E_SUCCESS){
549
757
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
758
"Error[%d] while reading the key pair ('%s',"
551
759
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
760
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
761
safer_gnutls_strerror(ret));
562
770
safer_gnutls_strerror(ret));
563
771
goto globalfail;
564
772
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
566
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
569
goto globalfail;
570
}
571
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
776
do {
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
778
if(dhpfile == -1){
779
perror_plus("open");
780
dhparamsfilename = NULL;
781
break;
782
}
783
size_t params_capacity = 0;
784
while(true){
785
params_capacity = incbuffer((char **)¶ms.data,
786
(size_t)params.size,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
790
free(params.data);
791
params.data = NULL;
792
dhparamsfilename = NULL;
793
break;
794
}
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
797
BUFFER_SIZE);
798
/* EOF */
799
if(bytes_read == 0){
800
break;
801
}
802
/* check bytes_read for failure */
803
if(bytes_read < 0){
804
perror_plus("read");
805
free(params.data);
806
params.data = NULL;
807
dhparamsfilename = NULL;
808
break;
809
}
810
params.size += (unsigned int)bytes_read;
811
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
818
}
819
if(dhparamsfilename == NULL){
820
break;
821
}
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
829
}
830
free(params.data);
831
} while(false);
832
}
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
839
do {
840
int secfile = open(seckeyfilename, O_RDONLY);
841
if(secfile == -1){
842
perror_plus("open");
843
break;
844
}
845
size_t buffer_capacity = 0;
846
while(true){
847
buffer_capacity = incbuffer((char **)&buffer.data,
848
(size_t)buffer.size,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
852
free(buffer.data);
853
buffer.data = NULL;
854
break;
855
}
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
858
BUFFER_SIZE);
859
/* EOF */
860
if(bytes_read == 0){
861
break;
862
}
863
/* check bytes_read for failure */
864
if(bytes_read < 0){
865
perror_plus("read");
866
free(buffer.data);
867
buffer.data = NULL;
868
break;
869
}
870
buffer.size += (unsigned int)bytes_read;
871
}
872
close(secfile);
873
} while(false);
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
877
{
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
882
" structure: %s",
883
safer_gnutls_strerror(ret));
884
free(buffer.data);
885
buffer.data = NULL;
886
} else {
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
892
privkey = NULL;
893
}
894
free(buffer.data);
895
buffer.data = NULL;
896
if(privkey != NULL){
897
/* Use private key to suggest an appropriate
898
sec_param */
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
901
if(debug){
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)));
906
}
907
}
908
}
909
}
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
913
if(debug){
914
fprintf_plus(stderr, "Falling back to security parameter"
915
" \"%s\"\n",
916
safe_string(gnutls_sec_param_get_name
917
(sec_param)));
918
}
919
}
920
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
if(uret != 0){
923
mc->dh_bits = uret;
924
if(debug){
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
928
(sec_param)),
929
mc->dh_bits);
930
}
931
} else {
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)),
936
safer_gnutls_strerror(ret));
937
goto globalfail;
938
}
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);
953
}
954
}
573
955
574
956
return 0;
575
957
576
958
globalfail:
577
959
578
960
gnutls_certificate_free_credentials(mc->cred);
579
gnutls_global_deinit();
580
961
gnutls_dh_params_deinit(mc->dh_params);
581
962
return -1;
582
963
}
587
968
int ret;
588
969
/* GnuTLS session creation */
589
970
do {
590
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
591
979
if(quit_now){
592
980
return -1;
593
981
}
634
1022
/* ignore client certificate if any. */
635
1023
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
636
1024
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
638
639
1025
return 0;
640
1026
}
641
1027
643
1029
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
644
1030
__attribute__((unused)) const char *txt){}
645
1031
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
646
1205
/* Called when a Mandos server is found */
647
1206
__attribute__((nonnull, warn_unused_result))
648
1207
static int start_mandos_communication(const char *ip, in_port_t port,
659
1218
int retval = -1;
660
1219
gnutls_session_t session;
661
1220
int pf; /* Protocol family */
1221
bool route_added = false;
662
1222
663
1223
errno = 0;
664
1224
686
1246
bool match = false;
687
1247
{
688
1248
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
691
1252
if(if_nametoindex(interface) == (unsigned int)if_index){
692
1253
match = true;
693
1254
break;
722
1283
PRIuMAX "\n", ip, (uintmax_t)port);
723
1284
}
724
1285
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
726
1287
if(tcp_sd < 0){
727
1288
int e = errno;
728
1289
perror_plus("socket");
735
1296
goto mandos_end;
736
1297
}
737
1298
738
memset(&to, 0, sizeof(to));
739
1299
if(af == AF_INET6){
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
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);
742
1303
} else { /* IPv4 */
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
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);
745
1307
}
746
1308
if(ret < 0 ){
747
1309
int e = errno;
817
1379
goto mandos_end;
818
1380
}
819
1381
820
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
823
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
826
}
827
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
int e = errno;
830
perror_plus("connect");
831
errno = e;
832
}
833
goto mandos_end;
834
}
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
1382
while(true){
1383
if(af == AF_INET6){
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1386
} else {
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1389
}
1390
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1397
&to)->sin6_addr)))
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1408
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1412
*/
1413
if(debug){
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1415
" direct route\n");
1416
}
1417
int e = errno;
1418
route_added = add_local_route(ip, if_index);
1419
if(route_added){
1420
continue;
1421
}
1422
errno = e;
1423
}
1424
if(errno != ECONNREFUSED or debug){
1425
int e = errno;
1426
perror_plus("connect");
1427
errno = e;
1428
}
1429
goto mandos_end;
1430
}
1431
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
break;
839
1437
}
840
1438
841
1439
const char *out = mandos_protocol_version;
995
1593
&decrypted_buffer, mc);
996
1594
if(decrypted_buffer_size >= 0){
997
1595
1596
clearerr(stdout);
998
1597
written = 0;
999
1598
while(written < (size_t) decrypted_buffer_size){
1000
1599
if(quit_now){
1016
1615
}
1017
1616
written += (size_t)ret;
1018
1617
}
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
}
1019
1628
retval = 0;
1020
1629
}
1021
1630
}
1024
1633
1025
1634
mandos_end:
1026
1635
{
1636
if(route_added){
1637
if(not delete_local_route(ip, if_index)){
1638
fprintf_plus(stderr, "Failed to delete local route to %s on"
1639
" interface %d", ip, if_index);
1640
}
1641
}
1027
1642
int e = errno;
1028
1643
free(decrypted_buffer);
1029
1644
free(buffer);
1030
1645
if(tcp_sd >= 0){
1031
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1646
ret = close(tcp_sd);
1032
1647
}
1033
1648
if(ret == -1){
1034
1649
if(e == 0){
1046
1661
return retval;
1047
1662
}
1048
1663
1049
__attribute__((nonnull))
1050
1664
static void resolve_callback(AvahiSServiceResolver *r,
1051
1665
AvahiIfIndex interface,
1052
1666
AvahiProtocol proto,
1069
1683
timed out */
1070
1684
1071
1685
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1072
1687
return;
1073
1688
}
1074
1689
1188
1803
__attribute__((nonnull, warn_unused_result))
1189
1804
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
1805
int ret;
1191
error_t ret_errno;
1806
int old_errno;
1192
1807
1193
1808
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
1809
if(s < 0){
1195
ret_errno = errno;
1810
old_errno = errno;
1196
1811
perror_plus("socket");
1197
errno = ret_errno;
1812
errno = old_errno;
1198
1813
return false;
1199
1814
}
1200
strcpy(ifr->ifr_name, ifname);
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1201
1817
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
1818
if(ret == -1){
1203
1819
if(debug){
1204
ret_errno = errno;
1820
old_errno = errno;
1205
1821
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1207
1828
}
1208
1829
return false;
1209
1830
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1210
1836
return true;
1211
1837
}
1212
1838
1454
2080
}
1455
2081
}
1456
2082
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
2083
__attribute__((nonnull))
1510
2084
void run_network_hooks(const char *mode, const char *interface,
1511
2085
const float delay){
1512
2086
struct dirent **direntries = NULL;
1513
2087
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2089
| O_CLOEXEC);
1515
2090
if(hookdir_fd == -1){
1516
2091
if(errno == ENOENT){
1517
2092
if(debug){
1524
2099
return;
1525
2100
}
1526
2101
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
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
}
1529
2107
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
2108
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
2109
if(numhooks == -1){
1540
2110
perror_plus("scandir");
2111
close(devnull);
1541
2112
return;
1542
2113
}
1543
2114
struct dirent *direntry;
1544
2115
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
2116
for(int i = 0; i < numhooks; i++){
1547
2117
direntry = direntries[i];
1548
2118
if(debug){
1572
2142
perror_plus("setgroups");
1573
2143
_exit(EX_NOPERM);
1574
2144
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
2145
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
2146
if(ret == -1){
1592
2147
perror_plus("setenv");
1627
2182
_exit(EX_OSERR);
1628
2183
}
1629
2184
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2186
direntry->d_name,
2187
O_RDONLY));
1631
2188
if(hook_fd == -1){
1632
2189
perror_plus("openat");
1633
2190
_exit(EXIT_FAILURE);
1634
2191
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2192
if(close(hookdir_fd) == -1){
1636
2193
perror_plus("close");
1637
2194
_exit(EXIT_FAILURE);
1638
2195
}
2196
ret = dup2(devnull, STDIN_FILENO);
2197
if(ret == -1){
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
_exit(EX_OSERR);
2200
}
2201
ret = close(devnull);
2202
if(ret == -1){
2203
perror_plus("close");
2204
_exit(EX_OSERR);
2205
}
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2207
if(ret == -1){
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2209
_exit(EX_OSERR);
2210
}
1639
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
2212
environ) == -1){
1641
2213
perror_plus("fexecve");
1642
2214
_exit(EXIT_FAILURE);
1643
2215
}
1644
2216
} else {
2217
if(hook_pid == -1){
2218
perror_plus("fork");
2219
free(direntry);
2220
continue;
2221
}
1645
2222
int status;
1646
2223
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
2224
perror_plus("waitpid");
2225
free(direntry);
1648
2226
continue;
1649
2227
}
1650
2228
if(WIFEXITED(status)){
1652
2230
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
2231
" with status %d\n", direntry->d_name,
1654
2232
WEXITSTATUS(status));
2233
free(direntry);
1655
2234
continue;
1656
2235
}
1657
2236
} else if(WIFSIGNALED(status)){
1658
2237
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
2238
" signal %d\n", direntry->d_name,
1660
2239
WTERMSIG(status));
2240
free(direntry);
1661
2241
continue;
1662
2242
} else {
1663
2243
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
2244
" crashed\n", direntry->d_name);
2245
free(direntry);
1665
2246
continue;
1666
2247
}
1667
2248
}
1669
2250
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
2251
direntry->d_name);
1671
2252
}
2253
free(direntry);
1672
2254
}
1673
2255
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2256
if(close(hookdir_fd) == -1){
1675
2257
perror_plus("close");
1676
2258
} else {
1677
2259
hookdir_fd = -1;
1680
2262
}
1681
2263
1682
2264
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
1686
2268
int ret;
1687
2269
struct ifreq network;
1688
2270
unsigned int if_index = if_nametoindex(interface);
1698
2280
}
1699
2281
1700
2282
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
1702
2285
if(not get_flags(interface, &network)){
1703
2286
ret_errno = errno;
1704
2287
fprintf_plus(stderr, "Failed to get flags for interface "
1717
2300
}
1718
2301
1719
2302
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2303
ret = close(sd);
1721
2304
if(ret == -1){
1722
2305
perror_plus("close");
1723
2306
}
1773
2356
}
1774
2357
1775
2358
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2359
ret = close(sd);
1777
2360
if(ret == -1){
1778
2361
perror_plus("close");
1779
2362
}
1791
2374
1792
2375
/* Sleep checking until interface is running.
1793
2376
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
2377
for(int i = 0; i < delay * 4; i++){
1795
2378
if(interface_is_running(interface)){
1796
2379
break;
1797
2380
}
1807
2390
}
1808
2391
1809
2392
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
1812
2395
struct ifreq network;
1813
2396
unsigned int if_index = if_nametoindex(interface);
1814
2397
if(if_index == 0){
1817
2400
return ENXIO;
1818
2401
}
1819
2402
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
1821
2405
if(not get_flags(interface, &network) and debug){
1822
2406
ret_errno = errno;
1823
2407
fprintf_plus(stderr, "Failed to get flags for interface "
1861
2445
}
1862
2446
1863
2447
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2448
int ret = close(sd);
1865
2449
if(ret == -1){
1866
2450
perror_plus("close");
1867
2451
}
1882
2466
}
1883
2467
1884
2468
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
2469
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 };
1889
2482
AvahiSServiceBrowser *sb = NULL;
1890
2483
error_t ret_errno;
1891
2484
int ret;
1900
2493
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
2494
const char *seckey = PATHDIR "/" SECKEY;
1902
2495
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
const char *dh_params_file = NULL;
1903
2501
char *interfaces_hooks = NULL;
1904
2502
1905
2503
bool gnutls_initialized = false;
1952
2550
{ .name = "pubkey", .key = 'p',
1953
2551
.arg = "FILE",
1954
2552
.doc = "OpenPGP public key file base name",
1955
.group = 2 },
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 },
1956
2570
{ .name = "dh-bits", .key = 129,
1957
2571
.arg = "BITS",
1958
2572
.doc = "Bit length of the prime number used in the"
1959
2573
" Diffie-Hellman key exchange",
1960
2574
.group = 2 },
2575
{ .name = "dh-params", .key = 134,
2576
.arg = "FILE",
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2579
.group = 2 },
1961
2580
{ .name = "priority", .key = 130,
1962
2581
.arg = "STRING",
1963
2582
.doc = "GnuTLS priority string for the TLS handshake",
2009
2628
case 'p': /* --pubkey */
2010
2629
pubkey = arg;
2011
2630
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;
2012
2641
case 129: /* --dh-bits */
2013
2642
errno = 0;
2014
2643
tmpmax = strtoimax(arg, &tmp, 10);
2018
2647
}
2019
2648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2020
2649
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
2021
2653
case 130: /* --priority */
2022
2654
mc.priority = arg;
2023
2655
break;
2046
2678
argp_state_help(state, state->out_stream,
2047
2679
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2048
2680
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2049
2682
case -3: /* --usage */
2050
2683
argp_state_help(state, state->out_stream,
2051
2684
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2052
2686
case 'V': /* --version */
2053
2687
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2054
2688
exit(argp_err_exit_status);
2063
2697
.args_doc = "",
2064
2698
.doc = "Mandos client -- Get and decrypt"
2065
2699
" passwords from a Mandos server" };
2066
ret = argp_parse(&argp, argc, argv,
2067
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2068
switch(ret){
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
2069
2703
case 0:
2070
2704
break;
2071
2705
case ENOMEM:
2072
2706
default:
2073
errno = ret;
2707
errno = ret_errno;
2074
2708
perror_plus("argp_parse");
2075
2709
exitcode = EX_OSERR;
2076
2710
goto end;
2079
2713
goto end;
2080
2714
}
2081
2715
}
2082
2716
2083
2717
{
2084
2718
/* Work around Debian bug #633582:
2085
<http://bugs.debian.org/633582> */
2719
<https://bugs.debian.org/633582> */
2086
2720
2087
2721
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2091
2725
perror_plus("Failed to raise privileges");
2092
2726
} else {
2093
2727
struct stat st;
2109
2743
}
2110
2744
}
2111
2745
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2746
close(seckey_fd);
2113
2747
}
2114
2748
}
2115
2749
2116
2750
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
2751
int pubkey_fd = open(pubkey, O_RDONLY);
2118
2752
if(pubkey_fd == -1){
2130
2764
}
2131
2765
}
2132
2766
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2767
close(pubkey_fd);
2768
}
2769
}
2770
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2776
} else {
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2778
if(ret == -1){
2779
perror_plus("fstat");
2780
} else {
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2784
if(ret == -1){
2785
perror_plus("fchown");
2786
}
2787
}
2788
}
2789
close(dhparams_fd);
2790
}
2791
}
2792
2137
2793
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2141
2797
perror_plus("Failed to lower privileges");
2142
2798
}
2143
2799
}
2268
2924
if(ret_errno != 0){
2269
2925
errno = ret_errno;
2270
2926
perror_plus("argz_add");
2927
free(direntries[i]);
2271
2928
continue;
2272
2929
}
2273
2930
if(debug){
2274
2931
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
2932
direntries[i]->d_name);
2276
2933
}
2934
free(direntries[i]);
2277
2935
}
2278
2936
free(direntries);
2279
2937
} else {
2311
2969
errno = bring_up_interface(interface, delay);
2312
2970
if(not interface_was_up){
2313
2971
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2315
2974
} else {
2316
2975
errno = argz_add(&interfaces_to_take_down,
2317
2976
&interfaces_to_take_down_size,
2340
2999
goto end;
2341
3000
}
2342
3001
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
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
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
2344
3009
if(ret == -1){
2345
3010
fprintf_plus(stderr, "init_gnutls_global failed\n");
2346
3011
exitcode = EX_UNAVAILABLE;
2468
3133
2469
3134
/* Allocate a new server */
2470
3135
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
3136
&config, NULL, NULL, &ret);
2472
3137
2473
3138
/* Free the Avahi configuration data */
2474
3139
avahi_server_config_free(&config);
2477
3142
/* Check if creating the Avahi server object succeeded */
2478
3143
if(mc.server == NULL){
2479
3144
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
3145
avahi_strerror(ret));
2481
3146
exitcode = EX_UNAVAILABLE;
2482
3147
goto end;
2483
3148
}
2518
3183
end:
2519
3184
2520
3185
if(debug){
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2522
3193
}
2523
3194
2524
3195
/* Cleanup things */
2535
3206
2536
3207
if(gnutls_initialized){
2537
3208
gnutls_certificate_free_credentials(mc.cred);
2538
gnutls_global_deinit();
2539
3209
gnutls_dh_params_deinit(mc.dh_params);
2540
3210
}
2541
3211
2549
3219
mc.current_server->prev->next = NULL;
2550
3220
while(mc.current_server != NULL){
2551
3221
server *next = mc.current_server->next;
3222
#ifdef __GNUC__
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3225
#endif
3226
free((char *)(mc.current_server->ip));
3227
#ifdef __GNUC__
3228
#pragma GCC diagnostic pop
3229
#endif
2552
3230
free(mc.current_server);
2553
3231
mc.current_server = next;
2554
3232
}
2556
3234
2557
3235
/* Re-raise privileges */
2558
3236
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
2562
3240
perror_plus("Failed to raise privileges");
2563
3241
} else {
2564
3242
2569
3247
/* Take down the network interfaces which were brought up */
2570
3248
{
2571
3249
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
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;
2578
3256
perror_plus("Failed to take down interface");
2579
3257
}
2580
3258
}
2585
3263
}
2586
3264
}
2587
3265
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
2591
3269
perror_plus("Failed to lower privileges permanently");
2592
3270
}
2593
3271
}
2595
3273
free(interfaces_to_take_down);
2596
3274
free(interfaces_hooks);
2597
3275
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
2598
3330
/* Removes the GPGME temp directory and all files inside */
2599
3331
if(tempdir != NULL){
2600
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2637
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2639
}
3332
clean_dir_at(-1, tempdir, 0);
2640
3333
}
2641
3334
2642
3335
if(quit_now){
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Version: 2.0.2.dev0