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- Committer: Teddy Hogeborn
- Date: 2014-07-12 12:54:13 UTC
- Revision ID: teddy@recompile.se-20140712125413-2v66uak9da6kwjs5
mandos: The Debian package should prefer "ssh-client" over "fping".
* debian/control (mandos/Recommends): List "ssh-client" before
"fping".
* debian/control (mandos/Recommends): List "ssh-client" before
"fping".
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- dracut-module
- plugin-helpers
- 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 © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
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;
248
234
.af = af };
249
235
if(new_server->ip == NULL){
250
236
perror_plus("strdup");
251
free(new_server);
252
237
return false;
253
238
}
254
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
240
if(ret == -1){
256
241
perror_plus("clock_gettime");
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
265
free(new_server);
266
242
return false;
267
243
}
268
244
/* Special case of first server */
280
256
return true;
281
257
}
282
258
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
259
/*
336
260
* Initialize GPGME.
337
261
*/
357
281
return false;
358
282
}
359
283
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
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
410
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
285
if(rc != GPG_ERR_NO_ERROR){
412
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
420
294
gpgme_strsource(rc), gpgme_strerror(rc));
421
295
return false;
422
296
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
498
297
499
ret = close(fd);
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
299
if(ret == -1){
501
300
perror_plus("close");
502
301
}
541
340
/* Create new GPGME "context" */
542
341
rc = gpgme_new(&(mc->ctx));
543
342
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
546
346
return false;
547
347
}
548
348
584
384
/* Create new empty GPGME data buffer for the plaintext */
585
385
rc = gpgme_data_new(&dh_plain);
586
386
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
588
389
gpgme_strsource(rc), gpgme_strerror(rc));
589
390
gpgme_data_release(dh_crypto);
590
391
return -1;
603
404
if(result == NULL){
604
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
406
} else {
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
612
411
if(result->file_name != NULL){
613
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
413
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
414
gpgme_recipient_t recipient;
415
recipient = result->recipients;
416
while(recipient != NULL){
618
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
421
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
623
425
}
624
426
}
625
427
}
681
483
return plaintext_length;
682
484
}
683
485
684
__attribute__((warn_unused_result, const))
685
static const char *safe_string(const char *str){
686
if(str == NULL)
687
return "(unknown)";
688
return str;
689
}
690
691
486
__attribute__((warn_unused_result))
692
487
static const char *safer_gnutls_strerror(int value){
693
488
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
695
492
}
696
493
697
494
/* GnuTLS log function callback */
701
498
fprintf_plus(stderr, "GnuTLS: %s", string);
702
499
}
703
500
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
501
__attribute__((nonnull, warn_unused_result))
705
502
static int init_gnutls_global(const char *pubkeyfilename,
706
503
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
504
mandos_context *mc){
709
505
int ret;
710
506
712
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
509
}
714
510
511
ret = gnutls_global_init();
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
515
return -1;
516
}
517
715
518
if(debug){
716
519
/* "Use a log level over 10 to enable all debugging options."
717
520
* - GnuTLS manual
725
528
if(ret != GNUTLS_E_SUCCESS){
726
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
530
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
728
532
return -1;
729
533
}
730
534
731
535
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
734
538
pubkeyfilename,
735
539
seckeyfilename);
736
540
}
737
541
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
751
542
ret = gnutls_certificate_set_openpgp_key_file
752
543
(mc->cred, pubkeyfilename, seckeyfilename,
753
544
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
545
if(ret != GNUTLS_E_SUCCESS){
758
546
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
550
safer_gnutls_strerror(ret));
771
559
safer_gnutls_strerror(ret));
772
560
goto globalfail;
773
561
}
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
785
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
794
break;
795
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
798
BUFFER_SIZE);
799
/* EOF */
800
if(bytes_read == 0){
801
break;
802
}
803
/* check bytes_read for failure */
804
if(bytes_read < 0){
805
perror_plus("read");
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
884
safer_gnutls_strerror(ret));
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
909
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
919
}
920
}
921
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
925
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
931
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
954
}
955
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
563
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
566
goto globalfail;
567
}
568
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
956
570
957
571
return 0;
958
572
959
573
globalfail:
960
574
961
575
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
962
577
gnutls_dh_params_deinit(mc->dh_params);
963
578
return -1;
964
579
}
969
584
int ret;
970
585
/* GnuTLS session creation */
971
586
do {
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
587
ret = gnutls_init(session, GNUTLS_SERVER);
980
588
if(quit_now){
981
589
return -1;
982
590
}
1023
631
/* ignore client certificate if any. */
1024
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
633
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
1026
636
return 0;
1027
637
}
1028
638
1030
640
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
641
__attribute__((unused)) const char *txt){}
1032
642
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
close(devnull);
1078
_exit(EX_NOPERM);
1079
}
1080
/* Reset supplementary groups */
1081
errno = 0;
1082
ret = setgroups(0, NULL);
1083
if(ret == -1){
1084
perror_plus("setgroups");
1085
close(devnull);
1086
_exit(EX_NOPERM);
1087
}
1088
}
1089
ret = dup2(devnull, STDIN_FILENO);
1090
if(ret == -1){
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1092
close(devnull);
1093
_exit(EX_OSERR);
1094
}
1095
ret = close(devnull);
1096
if(ret == -1){
1097
perror_plus("close");
1098
}
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1100
if(ret == -1){
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1102
_exit(EX_OSERR);
1103
}
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1105
O_RDONLY
1106
| O_DIRECTORY
1107
| O_PATH
1108
| O_CLOEXEC));
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1112
}
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1114
helper, O_RDONLY));
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1119
}
1120
close(helperdir_fd);
1121
#ifdef __GNUC__
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1124
#endif
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1128
environ) == -1){
1129
#ifdef __GNUC__
1130
#pragma GCC diagnostic pop
1131
#endif
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1134
}
1135
}
1136
if(pid == -1){
1137
perror_plus("fork");
1138
close(devnull);
1139
return false;
1140
}
1141
ret = close(devnull);
1142
if(ret == -1){
1143
perror_plus("close");
1144
}
1145
int status;
1146
pid_t pret = -1;
1147
errno = 0;
1148
do {
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1156
}
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1159
}
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1162
" helper program");
1163
}
1164
return false;
1165
}
1166
} while(pret == -1 and errno == EINTR);
1167
if(pret == -1){
1168
perror_plus("waitpid");
1169
return false;
1170
}
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1175
return false;
1176
}
1177
return true;
1178
}
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1182
return false;
1183
}
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1185
return false;
1186
}
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1191
if(debug){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1193
}
1194
return add_delete_local_route(true, address, if_index);
1195
}
1196
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1200
if(debug){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1202
}
1203
return add_delete_local_route(false, address, if_index);
1204
}
1205
1206
643
/* Called when a Mandos server is found */
1207
644
__attribute__((nonnull, warn_unused_result))
1208
645
static int start_mandos_communication(const char *ip, in_port_t port,
1219
656
int retval = -1;
1220
657
gnutls_session_t session;
1221
658
int pf; /* Protocol family */
1222
bool route_added = false;
1223
659
1224
660
errno = 0;
1225
661
1247
683
bool match = false;
1248
684
{
1249
685
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1252
interface))){
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1253
688
if(if_nametoindex(interface) == (unsigned int)if_index){
1254
689
match = true;
1255
690
break;
1284
719
PRIuMAX "\n", ip, (uintmax_t)port);
1285
720
}
1286
721
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1288
723
if(tcp_sd < 0){
1289
724
int e = errno;
1290
725
perror_plus("socket");
1297
732
goto mandos_end;
1298
733
}
1299
734
735
memset(&to, 0, sizeof(to));
1300
736
if(af == AF_INET6){
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1304
739
} else { /* IPv4 */
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1308
742
}
1309
743
if(ret < 0 ){
1310
744
int e = errno;
1380
814
goto mandos_end;
1381
815
}
1382
816
1383
while(true){
1384
if(af == AF_INET6){
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1387
} else {
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1390
}
1391
if(ret < 0){
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1398
&to)->sin6_addr)))
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1409
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1413
*/
1414
if(debug){
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1416
" direct route\n");
1417
}
1418
int e = errno;
1419
route_added = add_local_route(ip, if_index);
1420
if(route_added){
1421
continue;
1422
}
1423
errno = e;
1424
}
1425
if(errno != ECONNREFUSED or debug){
1426
int e = errno;
1427
perror_plus("connect");
1428
errno = e;
1429
}
1430
goto mandos_end;
1431
}
1432
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
break;
817
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
820
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
823
}
824
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
830
goto mandos_end;
831
}
832
833
if(quit_now){
834
errno = EINTR;
835
goto mandos_end;
1438
836
}
1439
837
1440
838
const char *out = mandos_protocol_version;
1594
992
&decrypted_buffer, mc);
1595
993
if(decrypted_buffer_size >= 0){
1596
994
1597
clearerr(stdout);
1598
995
written = 0;
1599
996
while(written < (size_t) decrypted_buffer_size){
1600
997
if(quit_now){
1616
1013
}
1617
1014
written += (size_t)ret;
1618
1015
}
1619
ret = fflush(stdout);
1620
if(ret != 0){
1621
int e = errno;
1622
if(debug){
1623
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1624
strerror(errno));
1625
}
1626
errno = e;
1627
goto mandos_end;
1628
}
1629
1016
retval = 0;
1630
1017
}
1631
1018
}
1634
1021
1635
1022
mandos_end:
1636
1023
{
1637
if(route_added){
1638
if(not delete_local_route(ip, if_index)){
1639
fprintf_plus(stderr, "Failed to delete local route to %s on"
1640
" interface %d", ip, if_index);
1641
}
1642
}
1643
1024
int e = errno;
1644
1025
free(decrypted_buffer);
1645
1026
free(buffer);
1646
1027
if(tcp_sd >= 0){
1647
ret = close(tcp_sd);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1648
1029
}
1649
1030
if(ret == -1){
1650
1031
if(e == 0){
1662
1043
return retval;
1663
1044
}
1664
1045
1046
__attribute__((nonnull))
1665
1047
static void resolve_callback(AvahiSServiceResolver *r,
1666
1048
AvahiIfIndex interface,
1667
1049
AvahiProtocol proto,
1684
1066
timed out */
1685
1067
1686
1068
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1688
1069
return;
1689
1070
}
1690
1071
1804
1185
__attribute__((nonnull, warn_unused_result))
1805
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1806
1187
int ret;
1807
int old_errno;
1188
error_t ret_errno;
1808
1189
1809
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
1191
if(s < 0){
1811
old_errno = errno;
1192
ret_errno = errno;
1812
1193
perror_plus("socket");
1813
errno = old_errno;
1194
errno = ret_errno;
1814
1195
return false;
1815
1196
}
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1197
strcpy(ifr->ifr_name, ifname);
1818
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1819
1199
if(ret == -1){
1820
1200
if(debug){
1821
old_errno = errno;
1201
ret_errno = errno;
1822
1202
perror_plus("ioctl SIOCGIFFLAGS");
1823
errno = old_errno;
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1203
errno = ret_errno;
1829
1204
}
1830
1205
return false;
1831
1206
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1837
1207
return true;
1838
1208
}
1839
1209
2081
1451
}
2082
1452
}
2083
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
2084
1506
__attribute__((nonnull))
2085
1507
void run_network_hooks(const char *mode, const char *interface,
2086
1508
const float delay){
2087
1509
struct dirent **direntries = NULL;
2088
1510
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2090
| O_CLOEXEC);
1511
hookdir_fd = open(hookdir, O_RDONLY);
2091
1512
if(hookdir_fd == -1){
2092
1513
if(errno == ENOENT){
2093
1514
if(debug){
2100
1521
return;
2101
1522
}
2102
1523
}
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
if(devnull == -1){
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2106
return;
2107
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
2108
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
2110
1536
if(numhooks == -1){
2111
1537
perror_plus("scandir");
2112
close(devnull);
2113
1538
return;
2114
1539
}
2115
1540
struct dirent *direntry;
2116
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
2117
1543
for(int i = 0; i < numhooks; i++){
2118
1544
direntry = direntries[i];
2119
1545
if(debug){
2143
1569
perror_plus("setgroups");
2144
1570
_exit(EX_NOPERM);
2145
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
2146
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2147
1588
if(ret == -1){
2148
1589
perror_plus("setenv");
2183
1624
_exit(EX_OSERR);
2184
1625
}
2185
1626
}
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2187
direntry->d_name,
2188
O_RDONLY));
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
2189
1628
if(hook_fd == -1){
2190
1629
perror_plus("openat");
2191
1630
_exit(EXIT_FAILURE);
2192
1631
}
2193
if(close(hookdir_fd) == -1){
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2194
1633
perror_plus("close");
2195
1634
_exit(EXIT_FAILURE);
2196
1635
}
2197
ret = dup2(devnull, STDIN_FILENO);
2198
if(ret == -1){
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2200
_exit(EX_OSERR);
2201
}
2202
ret = close(devnull);
2203
if(ret == -1){
2204
perror_plus("close");
2205
_exit(EX_OSERR);
2206
}
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2208
if(ret == -1){
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2210
_exit(EX_OSERR);
2211
}
2212
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2213
1637
environ) == -1){
2214
1638
perror_plus("fexecve");
2215
1639
_exit(EXIT_FAILURE);
2216
1640
}
2217
1641
} else {
2218
if(hook_pid == -1){
2219
perror_plus("fork");
2220
free(direntry);
2221
continue;
2222
}
2223
1642
int status;
2224
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
1644
perror_plus("waitpid");
2226
free(direntry);
2227
1645
continue;
2228
1646
}
2229
1647
if(WIFEXITED(status)){
2231
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
1650
" with status %d\n", direntry->d_name,
2233
1651
WEXITSTATUS(status));
2234
free(direntry);
2235
1652
continue;
2236
1653
}
2237
1654
} else if(WIFSIGNALED(status)){
2238
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
1656
" signal %d\n", direntry->d_name,
2240
1657
WTERMSIG(status));
2241
free(direntry);
2242
1658
continue;
2243
1659
} else {
2244
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
1661
" crashed\n", direntry->d_name);
2246
free(direntry);
2247
1662
continue;
2248
1663
}
2249
1664
}
2251
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2252
1667
direntry->d_name);
2253
1668
}
2254
free(direntry);
2255
1669
}
2256
1670
free(direntries);
2257
if(close(hookdir_fd) == -1){
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2258
1672
perror_plus("close");
2259
1673
} else {
2260
1674
hookdir_fd = -1;
2263
1677
}
2264
1678
2265
1679
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2267
const float delay){
2268
int old_errno = errno;
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
2269
1683
int ret;
2270
1684
struct ifreq network;
2271
1685
unsigned int if_index = if_nametoindex(interface);
2281
1695
}
2282
1696
2283
1697
if(not interface_is_up(interface)){
2284
int ret_errno = 0;
2285
int ioctl_errno = 0;
1698
error_t ret_errno = 0, ioctl_errno = 0;
2286
1699
if(not get_flags(interface, &network)){
2287
1700
ret_errno = errno;
2288
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2301
1714
}
2302
1715
2303
1716
if(quit_now){
2304
ret = close(sd);
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2305
1718
if(ret == -1){
2306
1719
perror_plus("close");
2307
1720
}
2357
1770
}
2358
1771
2359
1772
/* Close the socket */
2360
ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2361
1774
if(ret == -1){
2362
1775
perror_plus("close");
2363
1776
}
2375
1788
2376
1789
/* Sleep checking until interface is running.
2377
1790
Check every 0.25s, up to total time of delay */
2378
for(int i = 0; i < delay * 4; i++){
1791
for(int i=0; i < delay * 4; i++){
2379
1792
if(interface_is_running(interface)){
2380
1793
break;
2381
1794
}
2391
1804
}
2392
1805
2393
1806
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
2396
1809
struct ifreq network;
2397
1810
unsigned int if_index = if_nametoindex(interface);
2398
1811
if(if_index == 0){
2401
1814
return ENXIO;
2402
1815
}
2403
1816
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
1817
error_t ret_errno = 0, ioctl_errno = 0;
2406
1818
if(not get_flags(interface, &network) and debug){
2407
1819
ret_errno = errno;
2408
1820
fprintf_plus(stderr, "Failed to get flags for interface "
2446
1858
}
2447
1859
2448
1860
/* Close the socket */
2449
int ret = close(sd);
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2450
1862
if(ret == -1){
2451
1863
perror_plus("close");
2452
1864
}
2467
1879
}
2468
1880
2469
1881
int main(int argc, char *argv[]){
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
":%PROFILE_ULTRA",
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#else
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
#endif
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
2483
1886
AvahiSServiceBrowser *sb = NULL;
2484
1887
error_t ret_errno;
2485
1888
int ret;
2494
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2495
1898
const char *seckey = PATHDIR "/" SECKEY;
2496
1899
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2500
#endif
2501
const char *dh_params_file = NULL;
2502
1900
char *interfaces_hooks = NULL;
2503
1901
2504
1902
bool gnutls_initialized = false;
2551
1949
{ .name = "pubkey", .key = 'p',
2552
1950
.arg = "FILE",
2553
1951
.doc = "OpenPGP public key file base name",
2554
.group = 1 },
2555
{ .name = "tls-privkey", .key = 't',
2556
.arg = "FILE",
2557
#if GNUTLS_VERSION_NUMBER >= 0x030606
2558
.doc = "TLS private key file base name",
2559
#else
2560
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2561
#endif
2562
.group = 1 },
2563
{ .name = "tls-pubkey", .key = 'T',
2564
.arg = "FILE",
2565
#if GNUTLS_VERSION_NUMBER >= 0x030606
2566
.doc = "TLS public key file base name",
2567
#else
2568
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2569
#endif
2570
.group = 1 },
1952
.group = 2 },
2571
1953
{ .name = "dh-bits", .key = 129,
2572
1954
.arg = "BITS",
2573
1955
.doc = "Bit length of the prime number used in the"
2574
1956
" Diffie-Hellman key exchange",
2575
1957
.group = 2 },
2576
{ .name = "dh-params", .key = 134,
2577
.arg = "FILE",
2578
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2579
" for the Diffie-Hellman key exchange",
2580
.group = 2 },
2581
1958
{ .name = "priority", .key = 130,
2582
1959
.arg = "STRING",
2583
1960
.doc = "GnuTLS priority string for the TLS handshake",
2629
2006
case 'p': /* --pubkey */
2630
2007
pubkey = arg;
2631
2008
break;
2632
case 't': /* --tls-privkey */
2633
#if GNUTLS_VERSION_NUMBER >= 0x030606
2634
tls_privkey = arg;
2635
#endif
2636
break;
2637
case 'T': /* --tls-pubkey */
2638
#if GNUTLS_VERSION_NUMBER >= 0x030606
2639
tls_pubkey = arg;
2640
#endif
2641
break;
2642
2009
case 129: /* --dh-bits */
2643
2010
errno = 0;
2644
2011
tmpmax = strtoimax(arg, &tmp, 10);
2648
2015
}
2649
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2650
2017
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
2654
2018
case 130: /* --priority */
2655
2019
mc.priority = arg;
2656
2020
break;
2679
2043
argp_state_help(state, state->out_stream,
2680
2044
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2681
2045
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
2683
2046
case -3: /* --usage */
2684
2047
argp_state_help(state, state->out_stream,
2685
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
2687
2049
case 'V': /* --version */
2688
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2689
2051
exit(argp_err_exit_status);
2698
2060
.args_doc = "",
2699
2061
.doc = "Mandos client -- Get and decrypt"
2700
2062
" passwords from a Mandos server" };
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2703
switch(ret_errno){
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2065
switch(ret){
2704
2066
case 0:
2705
2067
break;
2706
2068
case ENOMEM:
2707
2069
default:
2708
errno = ret_errno;
2070
errno = ret;
2709
2071
perror_plus("argp_parse");
2710
2072
exitcode = EX_OSERR;
2711
2073
goto end;
2714
2076
goto end;
2715
2077
}
2716
2078
}
2717
2079
2718
2080
{
2719
2081
/* Work around Debian bug #633582:
2720
<https://bugs.debian.org/633582> */
2082
<http://bugs.debian.org/633582> */
2721
2083
2722
2084
/* Re-raise privileges */
2723
ret = raise_privileges();
2724
if(ret != 0){
2725
errno = ret;
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2726
2088
perror_plus("Failed to raise privileges");
2727
2089
} else {
2728
2090
struct stat st;
2744
2106
}
2745
2107
}
2746
2108
}
2747
close(seckey_fd);
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2748
2110
}
2749
2111
}
2750
2112
2751
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2752
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2753
2115
if(pubkey_fd == -1){
2765
2127
}
2766
2128
}
2767
2129
}
2768
close(pubkey_fd);
2769
}
2770
}
2771
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2777
} else {
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2779
if(ret == -1){
2780
perror_plus("fstat");
2781
} else {
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2785
if(ret == -1){
2786
perror_plus("fchown");
2787
}
2788
}
2789
}
2790
close(dhparams_fd);
2791
}
2792
}
2793
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2794
2134
/* Lower privileges */
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2798
2138
perror_plus("Failed to lower privileges");
2799
2139
}
2800
2140
}
2925
2265
if(ret_errno != 0){
2926
2266
errno = ret_errno;
2927
2267
perror_plus("argz_add");
2928
free(direntries[i]);
2929
2268
continue;
2930
2269
}
2931
2270
if(debug){
2932
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2933
2272
direntries[i]->d_name);
2934
2273
}
2935
free(direntries[i]);
2936
2274
}
2937
2275
free(direntries);
2938
2276
} else {
2970
2308
errno = bring_up_interface(interface, delay);
2971
2309
if(not interface_was_up){
2972
2310
if(errno != 0){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2311
perror_plus("Failed to bring up interface");
2975
2312
} else {
2976
2313
errno = argz_add(&interfaces_to_take_down,
2977
2314
&interfaces_to_take_down_size,
3000
2337
goto end;
3001
2338
}
3002
2339
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3007
#else
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3009
#endif
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
3010
2341
if(ret == -1){
3011
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
3012
2343
exitcode = EX_UNAVAILABLE;
3134
2465
3135
2466
/* Allocate a new server */
3136
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3137
&config, NULL, NULL, &ret);
2468
&config, NULL, NULL, &ret_errno);
3138
2469
3139
2470
/* Free the Avahi configuration data */
3140
2471
avahi_server_config_free(&config);
3143
2474
/* Check if creating the Avahi server object succeeded */
3144
2475
if(mc.server == NULL){
3145
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3146
avahi_strerror(ret));
2477
avahi_strerror(ret_errno));
3147
2478
exitcode = EX_UNAVAILABLE;
3148
2479
goto end;
3149
2480
}
3184
2515
end:
3185
2516
3186
2517
if(debug){
3187
if(signal_received){
3188
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3189
argv[0], signal_received,
3190
strsignal(signal_received));
3191
} else {
3192
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
}
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3194
2519
}
3195
2520
3196
2521
/* Cleanup things */
3207
2532
3208
2533
if(gnutls_initialized){
3209
2534
gnutls_certificate_free_credentials(mc.cred);
2535
gnutls_global_deinit();
3210
2536
gnutls_dh_params_deinit(mc.dh_params);
3211
2537
}
3212
2538
3220
2546
mc.current_server->prev->next = NULL;
3221
2547
while(mc.current_server != NULL){
3222
2548
server *next = mc.current_server->next;
3223
#ifdef __GNUC__
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3226
#endif
3227
free((char *)(mc.current_server->ip));
3228
#ifdef __GNUC__
3229
#pragma GCC diagnostic pop
3230
#endif
3231
2549
free(mc.current_server);
3232
2550
mc.current_server = next;
3233
2551
}
3235
2553
3236
2554
/* Re-raise privileges */
3237
2555
{
3238
ret = raise_privileges();
3239
if(ret != 0){
3240
errno = ret;
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
3241
2559
perror_plus("Failed to raise privileges");
3242
2560
} else {
3243
2561
3248
2566
/* Take down the network interfaces which were brought up */
3249
2567
{
3250
2568
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3253
interface))){
3254
ret = take_down_interface(interface);
3255
if(ret != 0){
3256
errno = ret;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
3257
2575
perror_plus("Failed to take down interface");
3258
2576
}
3259
2577
}
3264
2582
}
3265
2583
}
3266
2584
3267
ret = lower_privileges_permanently();
3268
if(ret != 0){
3269
errno = ret;
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
3270
2588
perror_plus("Failed to lower privileges permanently");
3271
2589
}
3272
2590
}
3274
2592
free(interfaces_to_take_down);
3275
2593
free(interfaces_hooks);
3276
2594
3277
void clean_dir_at(int base, const char * const dirname,
3278
uintmax_t level){
3279
struct dirent **direntries = NULL;
3280
int dret;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3282
O_RDONLY
3283
| O_NOFOLLOW
3284
| O_DIRECTORY
3285
| O_PATH));
3286
if(dir_fd == -1){
3287
perror_plus("open");
3288
return;
3289
}
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
3293
for(int i = 0; i < numentries; i++){
3294
if(debug){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3297
}
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3299
if(dret == -1){
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3302
AT_REMOVEDIR);
3303
}
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3309
dret = 0;
3310
}
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3314
}
3315
}
3316
free(direntries[i]);
3317
}
3318
3319
/* need to clean even if 0 because man page doesn't specify */
3320
free(direntries);
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3324
}
3325
} else {
3326
perror_plus("scandirat");
3327
}
3328
close(dir_fd);
3329
}
3330
3331
2595
/* Removes the GPGME temp directory and all files inside */
3332
2596
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
2597
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2636
}
3334
2637
}
3335
2638
3336
2639
if(quit_now){
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Version: 2.0.2.dev0