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- Committer: Teddy Hogeborn
- Date: 2019-07-25 22:44:36 UTC
- Revision ID: teddy@recompile.se-20190725224436-19eyd06r7qmtowo6
Allow line breaks on long lines in plugin-runner manual
* debian/mandos-client.lintian-overrides
(manpage-has-errors-from-man): Remove.
* plugin-runner.xml (EXAMPLE): Allow line breaks by adding ZERO WIDTH
SPACE characters. Also correct
description of example command line.
* debian/mandos-client.lintian-overrides
(manpage-has-errors-from-man): Remove.
* plugin-runner.xml (EXAMPLE): Allow line breaks by adding ZERO WIDTH
SPACE characters. Also correct
description of example command line.
- files added:
- bugs.xml
- debian/tests
- 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 © 2008-2019 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
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;
234
248
.af = af };
235
249
if(new_server->ip == NULL){
236
250
perror_plus("strdup");
251
free(new_server);
237
252
return false;
238
253
}
239
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
255
if(ret == -1){
241
256
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);
242
266
return false;
243
267
}
244
268
/* Special case of first server */
256
280
return true;
257
281
}
258
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
259
335
/*
260
336
* Initialize GPGME.
261
337
*/
281
357
return false;
282
358
}
283
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
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
284
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
411
if(rc != GPG_ERR_NO_ERROR){
286
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
294
420
gpgme_strsource(rc), gpgme_strerror(rc));
295
421
return false;
296
422
}
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
}
297
498
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
299
500
if(ret == -1){
300
501
perror_plus("close");
301
502
}
340
541
/* Create new GPGME "context" */
341
542
rc = gpgme_new(&(mc->ctx));
342
543
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
346
546
return false;
347
547
}
348
548
384
584
/* Create new empty GPGME data buffer for the plaintext */
385
585
rc = gpgme_data_new(&dh_plain);
386
586
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
389
588
gpgme_strsource(rc), gpgme_strerror(rc));
390
589
gpgme_data_release(dh_crypto);
391
590
return -1;
404
603
if(result == NULL){
405
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
406
605
} else {
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);
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");
411
612
if(result->file_name != NULL){
412
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
413
614
}
414
gpgme_recipient_t recipient;
415
recipient = result->recipients;
416
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
417
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
421
621
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
424
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
425
623
}
426
624
}
427
625
}
483
681
return plaintext_length;
484
682
}
485
683
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
486
691
__attribute__((warn_unused_result))
487
692
static const char *safer_gnutls_strerror(int value){
488
693
const char *ret = gnutls_strerror(value);
489
if(ret == NULL)
490
ret = "(unknown)";
491
return ret;
694
return safe_string(ret);
492
695
}
493
696
494
697
/* GnuTLS log function callback */
498
701
fprintf_plus(stderr, "GnuTLS: %s", string);
499
702
}
500
703
501
__attribute__((nonnull, warn_unused_result))
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
502
705
static int init_gnutls_global(const char *pubkeyfilename,
503
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
504
708
mandos_context *mc){
505
709
int ret;
506
710
508
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
509
713
}
510
714
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
518
715
if(debug){
519
716
/* "Use a log level over 10 to enable all debugging options."
520
717
* - GnuTLS manual
528
725
if(ret != GNUTLS_E_SUCCESS){
529
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
727
safer_gnutls_strerror(ret));
531
gnutls_global_deinit();
532
728
return -1;
533
729
}
534
730
535
731
if(debug){
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
538
734
pubkeyfilename,
539
735
seckeyfilename);
540
736
}
541
737
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
542
751
ret = gnutls_certificate_set_openpgp_key_file
543
752
(mc->cred, pubkeyfilename, seckeyfilename,
544
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
545
757
if(ret != GNUTLS_E_SUCCESS){
546
758
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
548
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
762
safer_gnutls_strerror(ret));
559
771
safer_gnutls_strerror(ret));
560
772
goto globalfail;
561
773
}
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);
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
}
570
956
571
957
return 0;
572
958
573
959
globalfail:
574
960
575
961
gnutls_certificate_free_credentials(mc->cred);
576
gnutls_global_deinit();
577
962
gnutls_dh_params_deinit(mc->dh_params);
578
963
return -1;
579
964
}
584
969
int ret;
585
970
/* GnuTLS session creation */
586
971
do {
587
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
588
980
if(quit_now){
589
981
return -1;
590
982
}
631
1023
/* ignore client certificate if any. */
632
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
1025
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
635
636
1026
return 0;
637
1027
}
638
1028
640
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
641
1031
__attribute__((unused)) const char *txt){}
642
1032
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
_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
_exit(EX_NOPERM);
1085
}
1086
}
1087
ret = dup2(devnull, STDIN_FILENO);
1088
if(ret == -1){
1089
perror_plus("dup2(devnull, STDIN_FILENO)");
1090
_exit(EX_OSERR);
1091
}
1092
ret = close(devnull);
1093
if(ret == -1){
1094
perror_plus("close");
1095
_exit(EX_OSERR);
1096
}
1097
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1098
if(ret == -1){
1099
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1100
_exit(EX_OSERR);
1101
}
1102
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1103
O_RDONLY
1104
| O_DIRECTORY
1105
| O_PATH
1106
| O_CLOEXEC));
1107
if(helperdir_fd == -1){
1108
perror_plus("open");
1109
_exit(EX_UNAVAILABLE);
1110
}
1111
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1112
helper, O_RDONLY));
1113
if(helper_fd == -1){
1114
perror_plus("openat");
1115
close(helperdir_fd);
1116
_exit(EX_UNAVAILABLE);
1117
}
1118
close(helperdir_fd);
1119
#ifdef __GNUC__
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wcast-qual"
1122
#endif
1123
if(fexecve(helper_fd, (char *const [])
1124
{ helper, add ? add_arg : delete_arg, (char *)address,
1125
interface, debug ? debug_flag : NULL, NULL },
1126
environ) == -1){
1127
#ifdef __GNUC__
1128
#pragma GCC diagnostic pop
1129
#endif
1130
perror_plus("fexecve");
1131
_exit(EXIT_FAILURE);
1132
}
1133
}
1134
if(pid == -1){
1135
perror_plus("fork");
1136
return false;
1137
}
1138
int status;
1139
pid_t pret = -1;
1140
errno = 0;
1141
do {
1142
pret = waitpid(pid, &status, 0);
1143
if(pret == -1 and errno == EINTR and quit_now){
1144
int errno_raising = 0;
1145
if((errno = raise_privileges()) != 0){
1146
errno_raising = errno;
1147
perror_plus("Failed to raise privileges in order to"
1148
" kill helper program");
1149
}
1150
if(kill(pid, SIGTERM) == -1){
1151
perror_plus("kill");
1152
}
1153
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1154
perror_plus("Failed to lower privileges after killing"
1155
" helper program");
1156
}
1157
return false;
1158
}
1159
} while(pret == -1 and errno == EINTR);
1160
if(pret == -1){
1161
perror_plus("waitpid");
1162
return false;
1163
}
1164
if(WIFEXITED(status)){
1165
if(WEXITSTATUS(status) != 0){
1166
fprintf_plus(stderr, "Error: iprouteadddel exited"
1167
" with status %d\n", WEXITSTATUS(status));
1168
return false;
1169
}
1170
return true;
1171
}
1172
if(WIFSIGNALED(status)){
1173
fprintf_plus(stderr, "Error: iprouteadddel died by"
1174
" signal %d\n", WTERMSIG(status));
1175
return false;
1176
}
1177
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1178
return false;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
static bool add_local_route(const char *address,
1183
AvahiIfIndex if_index){
1184
if(debug){
1185
fprintf_plus(stderr, "Adding route to %s\n", address);
1186
}
1187
return add_delete_local_route(true, address, if_index);
1188
}
1189
1190
__attribute__((nonnull, warn_unused_result))
1191
static bool delete_local_route(const char *address,
1192
AvahiIfIndex if_index){
1193
if(debug){
1194
fprintf_plus(stderr, "Removing route to %s\n", address);
1195
}
1196
return add_delete_local_route(false, address, if_index);
1197
}
1198
643
1199
/* Called when a Mandos server is found */
644
1200
__attribute__((nonnull, warn_unused_result))
645
1201
static int start_mandos_communication(const char *ip, in_port_t port,
656
1212
int retval = -1;
657
1213
gnutls_session_t session;
658
1214
int pf; /* Protocol family */
1215
bool route_added = false;
659
1216
660
1217
errno = 0;
661
1218
683
1240
bool match = false;
684
1241
{
685
1242
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
688
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
689
1247
match = true;
690
1248
break;
719
1277
PRIuMAX "\n", ip, (uintmax_t)port);
720
1278
}
721
1279
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
723
1281
if(tcp_sd < 0){
724
1282
int e = errno;
725
1283
perror_plus("socket");
732
1290
goto mandos_end;
733
1291
}
734
1292
735
memset(&to, 0, sizeof(to));
736
1293
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
739
1297
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
742
1301
}
743
1302
if(ret < 0 ){
744
1303
int e = errno;
814
1373
goto mandos_end;
815
1374
}
816
1375
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;
1376
while(true){
1377
if(af == AF_INET6){
1378
ret = connect(tcp_sd, (struct sockaddr *)&to,
1379
sizeof(struct sockaddr_in6));
1380
} else {
1381
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1382
sizeof(struct sockaddr_in));
1383
}
1384
if(ret < 0){
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1386
and if_index != AVAHI_IF_UNSPEC
1387
and connect_to == NULL
1388
and not route_added and
1389
((af == AF_INET6 and not
1390
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1391
&to)->sin6_addr)))
1392
or (af == AF_INET and
1393
/* Not a a IPv4LL address */
1394
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1395
& 0xFFFF0000L) != 0xA9FE0000L))){
1396
/* Work around Avahi bug - Avahi does not announce link-local
1397
addresses if it has a global address, so local hosts with
1398
*only* a link-local address (e.g. Mandos clients) cannot
1399
connect to a Mandos server announced by Avahi on a server
1400
host with a global address. Work around this by retrying
1401
with an explicit route added with the server's address.
1402
1403
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
https://bugs.debian.org/587961
1406
*/
1407
if(debug){
1408
fprintf_plus(stderr, "Mandos server unreachable, trying"
1409
" direct route\n");
1410
}
1411
int e = errno;
1412
route_added = add_local_route(ip, if_index);
1413
if(route_added){
1414
continue;
1415
}
1416
errno = e;
1417
}
1418
if(errno != ECONNREFUSED or debug){
1419
int e = errno;
1420
perror_plus("connect");
1421
errno = e;
1422
}
1423
goto mandos_end;
1424
}
1425
1426
if(quit_now){
1427
errno = EINTR;
1428
goto mandos_end;
1429
}
1430
break;
836
1431
}
837
1432
838
1433
const char *out = mandos_protocol_version;
992
1587
&decrypted_buffer, mc);
993
1588
if(decrypted_buffer_size >= 0){
994
1589
1590
clearerr(stdout);
995
1591
written = 0;
996
1592
while(written < (size_t) decrypted_buffer_size){
997
1593
if(quit_now){
1013
1609
}
1014
1610
written += (size_t)ret;
1015
1611
}
1612
ret = fflush(stdout);
1613
if(ret != 0){
1614
int e = errno;
1615
if(debug){
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1617
strerror(errno));
1618
}
1619
errno = e;
1620
goto mandos_end;
1621
}
1016
1622
retval = 0;
1017
1623
}
1018
1624
}
1021
1627
1022
1628
mandos_end:
1023
1629
{
1630
if(route_added){
1631
if(not delete_local_route(ip, if_index)){
1632
fprintf_plus(stderr, "Failed to delete local route to %s on"
1633
" interface %d", ip, if_index);
1634
}
1635
}
1024
1636
int e = errno;
1025
1637
free(decrypted_buffer);
1026
1638
free(buffer);
1027
1639
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1640
ret = close(tcp_sd);
1029
1641
}
1030
1642
if(ret == -1){
1031
1643
if(e == 0){
1043
1655
return retval;
1044
1656
}
1045
1657
1046
__attribute__((nonnull))
1047
1658
static void resolve_callback(AvahiSServiceResolver *r,
1048
1659
AvahiIfIndex interface,
1049
1660
AvahiProtocol proto,
1066
1677
timed out */
1067
1678
1068
1679
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1069
1681
return;
1070
1682
}
1071
1683
1185
1797
__attribute__((nonnull, warn_unused_result))
1186
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1799
int ret;
1188
error_t ret_errno;
1800
int old_errno;
1189
1801
1190
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1803
if(s < 0){
1192
ret_errno = errno;
1804
old_errno = errno;
1193
1805
perror_plus("socket");
1194
errno = ret_errno;
1806
errno = old_errno;
1195
1807
return false;
1196
1808
}
1197
strcpy(ifr->ifr_name, ifname);
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1198
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1812
if(ret == -1){
1200
1813
if(debug){
1201
ret_errno = errno;
1814
old_errno = errno;
1202
1815
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1204
1822
}
1205
1823
return false;
1206
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1207
1830
return true;
1208
1831
}
1209
1832
1451
2074
}
1452
2075
}
1453
2076
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
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
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
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
#ifndef O_CLOEXEC
1511
/*
1512
* Based on the example in the GNU LibC manual chapter 13.13 "File
1513
* Descriptor Flags".
1514
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
*/
1516
__attribute__((warn_unused_result))
1517
static int set_cloexec_flag(int fd){
1518
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1519
/* If reading the flags failed, return error indication now. */
1520
if(ret < 0){
1521
return ret;
1522
}
1523
/* Store modified flag word in the descriptor. */
1524
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1525
ret | FD_CLOEXEC));
1526
}
1527
#endif /* not O_CLOEXEC */
1528
1529
2077
__attribute__((nonnull))
1530
2078
void run_network_hooks(const char *mode, const char *interface,
1531
2079
const float delay){
1532
struct dirent **direntries;
2080
struct dirent **direntries = NULL;
1533
2081
if(hookdir_fd == -1){
1534
hookdir_fd = open(hookdir, O_RDONLY |
1535
#ifdef O_CLOEXEC
1536
O_CLOEXEC
1537
#else /* not O_CLOEXEC */
1538
0
1539
#endif /* not O_CLOEXEC */
1540
);
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2083
| O_CLOEXEC);
1541
2084
if(hookdir_fd == -1){
1542
2085
if(errno == ENOENT){
1543
2086
if(debug){
1549
2092
}
1550
2093
return;
1551
2094
}
1552
#ifndef O_CLOEXEC
1553
if(set_cloexec_flag(hookdir_fd) < 0){
1554
perror_plus("set_cloexec_flag");
1555
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1556
perror_plus("close");
1557
} else {
1558
hookdir_fd = -1;
1559
}
1560
return;
1561
}
1562
#endif /* not O_CLOEXEC */
1563
}
1564
#ifdef __GLIBC__
1565
#if __GLIBC_PREREQ(2, 15)
2095
}
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
1566
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1567
2102
runnable_hook, alphasort);
1568
#else /* not __GLIBC_PREREQ(2, 15) */
1569
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
alphasort);
1571
#endif /* not __GLIBC_PREREQ(2, 15) */
1572
#else /* not __GLIBC__ */
1573
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
alphasort);
1575
#endif /* not __GLIBC__ */
1576
2103
if(numhooks == -1){
1577
2104
perror_plus("scandir");
2105
close(devnull);
1578
2106
return;
1579
2107
}
1580
2108
struct dirent *direntry;
1581
2109
int ret;
1582
int devnull = open("/dev/null", O_RDONLY);
1583
2110
for(int i = 0; i < numhooks; i++){
1584
2111
direntry = direntries[i];
1585
2112
if(debug){
1590
2117
if(hook_pid == 0){
1591
2118
/* Child */
1592
2119
/* Raise privileges */
1593
if(raise_privileges_permanently() != 0){
2120
errno = raise_privileges_permanently();
2121
if(errno != 0){
1594
2122
perror_plus("Failed to raise privileges");
1595
2123
_exit(EX_NOPERM);
1596
2124
}
1608
2136
perror_plus("setgroups");
1609
2137
_exit(EX_NOPERM);
1610
2138
}
1611
ret = dup2(devnull, STDIN_FILENO);
1612
if(ret == -1){
1613
perror_plus("dup2(devnull, STDIN_FILENO)");
1614
_exit(EX_OSERR);
1615
}
1616
ret = close(devnull);
1617
if(ret == -1){
1618
perror_plus("close");
1619
_exit(EX_OSERR);
1620
}
1621
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
if(ret == -1){
1623
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1624
_exit(EX_OSERR);
1625
}
1626
2139
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1627
2140
if(ret == -1){
1628
2141
perror_plus("setenv");
1663
2176
_exit(EX_OSERR);
1664
2177
}
1665
2178
}
1666
if(fexecve(hookdir_fd, (char *const [])
1667
{ direntry->d_name, NULL }, environ) == -1){
2179
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2180
direntry->d_name,
2181
O_RDONLY));
2182
if(hook_fd == -1){
2183
perror_plus("openat");
2184
_exit(EXIT_FAILURE);
2185
}
2186
if(close(hookdir_fd) == -1){
2187
perror_plus("close");
2188
_exit(EXIT_FAILURE);
2189
}
2190
ret = dup2(devnull, STDIN_FILENO);
2191
if(ret == -1){
2192
perror_plus("dup2(devnull, STDIN_FILENO)");
2193
_exit(EX_OSERR);
2194
}
2195
ret = close(devnull);
2196
if(ret == -1){
2197
perror_plus("close");
2198
_exit(EX_OSERR);
2199
}
2200
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2201
if(ret == -1){
2202
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2203
_exit(EX_OSERR);
2204
}
2205
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2206
environ) == -1){
1668
2207
perror_plus("fexecve");
1669
2208
_exit(EXIT_FAILURE);
1670
2209
}
1671
2210
} else {
2211
if(hook_pid == -1){
2212
perror_plus("fork");
2213
free(direntry);
2214
continue;
2215
}
1672
2216
int status;
1673
2217
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1674
2218
perror_plus("waitpid");
2219
free(direntry);
1675
2220
continue;
1676
2221
}
1677
2222
if(WIFEXITED(status)){
1679
2224
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
2225
" with status %d\n", direntry->d_name,
1681
2226
WEXITSTATUS(status));
2227
free(direntry);
1682
2228
continue;
1683
2229
}
1684
2230
} else if(WIFSIGNALED(status)){
1685
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1686
2232
" signal %d\n", direntry->d_name,
1687
2233
WTERMSIG(status));
2234
free(direntry);
1688
2235
continue;
1689
2236
} else {
1690
2237
fprintf_plus(stderr, "Warning: network hook \"%s\""
1691
2238
" crashed\n", direntry->d_name);
2239
free(direntry);
1692
2240
continue;
1693
2241
}
1694
2242
}
1696
2244
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1697
2245
direntry->d_name);
1698
2246
}
2247
free(direntry);
1699
2248
}
1700
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2249
free(direntries);
2250
if(close(hookdir_fd) == -1){
1701
2251
perror_plus("close");
1702
2252
} else {
1703
2253
hookdir_fd = -1;
1706
2256
}
1707
2257
1708
2258
__attribute__((nonnull, warn_unused_result))
1709
error_t bring_up_interface(const char *const interface,
1710
const float delay){
1711
error_t old_errno = errno;
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
1712
2262
int ret;
1713
2263
struct ifreq network;
1714
2264
unsigned int if_index = if_nametoindex(interface);
1724
2274
}
1725
2275
1726
2276
if(not interface_is_up(interface)){
1727
error_t ret_errno = 0, ioctl_errno = 0;
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
1728
2279
if(not get_flags(interface, &network)){
1729
2280
ret_errno = errno;
1730
2281
fprintf_plus(stderr, "Failed to get flags for interface "
1743
2294
}
1744
2295
1745
2296
if(quit_now){
1746
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2297
ret = close(sd);
1747
2298
if(ret == -1){
1748
2299
perror_plus("close");
1749
2300
}
1759
2310
/* Raise privileges */
1760
2311
ret_errno = raise_privileges();
1761
2312
if(ret_errno != 0){
2313
errno = ret_errno;
1762
2314
perror_plus("Failed to raise privileges");
1763
2315
}
1764
2316
1798
2350
}
1799
2351
1800
2352
/* Close the socket */
1801
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2353
ret = close(sd);
1802
2354
if(ret == -1){
1803
2355
perror_plus("close");
1804
2356
}
1816
2368
1817
2369
/* Sleep checking until interface is running.
1818
2370
Check every 0.25s, up to total time of delay */
1819
for(int i=0; i < delay * 4; i++){
2371
for(int i = 0; i < delay * 4; i++){
1820
2372
if(interface_is_running(interface)){
1821
2373
break;
1822
2374
}
1832
2384
}
1833
2385
1834
2386
__attribute__((nonnull, warn_unused_result))
1835
error_t take_down_interface(const char *const interface){
1836
error_t old_errno = errno;
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
1837
2389
struct ifreq network;
1838
2390
unsigned int if_index = if_nametoindex(interface);
1839
2391
if(if_index == 0){
1842
2394
return ENXIO;
1843
2395
}
1844
2396
if(interface_is_up(interface)){
1845
error_t ret_errno = 0, ioctl_errno = 0;
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
1846
2399
if(not get_flags(interface, &network) and debug){
1847
2400
ret_errno = errno;
1848
2401
fprintf_plus(stderr, "Failed to get flags for interface "
1868
2421
/* Raise privileges */
1869
2422
ret_errno = raise_privileges();
1870
2423
if(ret_errno != 0){
2424
errno = ret_errno;
1871
2425
perror_plus("Failed to raise privileges");
1872
2426
}
1873
2427
1885
2439
}
1886
2440
1887
2441
/* Close the socket */
1888
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2442
int ret = close(sd);
1889
2443
if(ret == -1){
1890
2444
perror_plus("close");
1891
2445
}
1906
2460
}
1907
2461
1908
2462
int main(int argc, char *argv[]){
1909
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1910
.priority = "SECURE256:!CTYPE-X.509:"
1911
"+CTYPE-OPENPGP", .current_server = NULL,
1912
.interfaces = NULL, .interfaces_size = 0 };
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
1913
2476
AvahiSServiceBrowser *sb = NULL;
1914
2477
error_t ret_errno;
1915
2478
int ret;
1924
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1925
2488
const char *seckey = PATHDIR "/" SECKEY;
1926
2489
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2493
#endif
2494
const char *dh_params_file = NULL;
1927
2495
char *interfaces_hooks = NULL;
1928
2496
1929
2497
bool gnutls_initialized = false;
1976
2544
{ .name = "pubkey", .key = 'p',
1977
2545
.arg = "FILE",
1978
2546
.doc = "OpenPGP public key file base name",
1979
.group = 2 },
2547
.group = 1 },
2548
{ .name = "tls-privkey", .key = 't',
2549
.arg = "FILE",
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2552
#else
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2554
#endif
2555
.group = 1 },
2556
{ .name = "tls-pubkey", .key = 'T',
2557
.arg = "FILE",
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2560
#else
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
#endif
2563
.group = 1 },
1980
2564
{ .name = "dh-bits", .key = 129,
1981
2565
.arg = "BITS",
1982
2566
.doc = "Bit length of the prime number used in the"
1983
2567
" Diffie-Hellman key exchange",
1984
2568
.group = 2 },
2569
{ .name = "dh-params", .key = 134,
2570
.arg = "FILE",
2571
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2572
" for the Diffie-Hellman key exchange",
2573
.group = 2 },
1985
2574
{ .name = "priority", .key = 130,
1986
2575
.arg = "STRING",
1987
2576
.doc = "GnuTLS priority string for the TLS handshake",
2033
2622
case 'p': /* --pubkey */
2034
2623
pubkey = arg;
2035
2624
break;
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2627
tls_privkey = arg;
2628
#endif
2629
break;
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2632
tls_pubkey = arg;
2633
#endif
2634
break;
2036
2635
case 129: /* --dh-bits */
2037
2636
errno = 0;
2038
2637
tmpmax = strtoimax(arg, &tmp, 10);
2042
2641
}
2043
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2044
2643
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2045
2647
case 130: /* --priority */
2046
2648
mc.priority = arg;
2047
2649
break;
2070
2672
argp_state_help(state, state->out_stream,
2071
2673
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2072
2674
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2073
2676
case -3: /* --usage */
2074
2677
argp_state_help(state, state->out_stream,
2075
2678
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2076
2680
case 'V': /* --version */
2077
2681
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2078
2682
exit(argp_err_exit_status);
2087
2691
.args_doc = "",
2088
2692
.doc = "Mandos client -- Get and decrypt"
2089
2693
" passwords from a Mandos server" };
2090
ret = argp_parse(&argp, argc, argv,
2091
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2092
switch(ret){
2694
ret_errno = argp_parse(&argp, argc, argv,
2695
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2696
switch(ret_errno){
2093
2697
case 0:
2094
2698
break;
2095
2699
case ENOMEM:
2096
2700
default:
2097
errno = ret;
2701
errno = ret_errno;
2098
2702
perror_plus("argp_parse");
2099
2703
exitcode = EX_OSERR;
2100
2704
goto end;
2103
2707
goto end;
2104
2708
}
2105
2709
}
2106
2710
2107
2711
{
2108
2712
/* Work around Debian bug #633582:
2109
<http://bugs.debian.org/633582> */
2713
<https://bugs.debian.org/633582> */
2110
2714
2111
2715
/* Re-raise privileges */
2112
ret_errno = raise_privileges();
2113
if(ret_errno != 0){
2114
errno = ret_errno;
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2115
2719
perror_plus("Failed to raise privileges");
2116
2720
} else {
2117
2721
struct stat st;
2133
2737
}
2134
2738
}
2135
2739
}
2136
TEMP_FAILURE_RETRY(close(seckey_fd));
2740
close(seckey_fd);
2137
2741
}
2138
2742
}
2139
2743
2140
2744
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2141
2745
int pubkey_fd = open(pubkey, O_RDONLY);
2142
2746
if(pubkey_fd == -1){
2154
2758
}
2155
2759
}
2156
2760
}
2157
TEMP_FAILURE_RETRY(close(pubkey_fd));
2158
}
2159
}
2160
2761
close(pubkey_fd);
2762
}
2763
}
2764
2765
if(dh_params_file != NULL
2766
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2767
int dhparams_fd = open(dh_params_file, O_RDONLY);
2768
if(dhparams_fd == -1){
2769
perror_plus("open");
2770
} else {
2771
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2772
if(ret == -1){
2773
perror_plus("fstat");
2774
} else {
2775
if(S_ISREG(st.st_mode)
2776
and st.st_uid == 0 and st.st_gid == 0){
2777
ret = fchown(dhparams_fd, uid, gid);
2778
if(ret == -1){
2779
perror_plus("fchown");
2780
}
2781
}
2782
}
2783
close(dhparams_fd);
2784
}
2785
}
2786
2161
2787
/* Lower privileges */
2162
ret_errno = lower_privileges();
2163
if(ret_errno != 0){
2164
errno = ret_errno;
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2165
2791
perror_plus("Failed to lower privileges");
2166
2792
}
2167
2793
}
2280
2906
2281
2907
/* If no interfaces were specified, make a list */
2282
2908
if(mc.interfaces == NULL){
2283
struct dirent **direntries;
2909
struct dirent **direntries = NULL;
2284
2910
/* Look for any good interfaces */
2285
2911
ret = scandir(sys_class_net, &direntries, good_interface,
2286
2912
alphasort);
2292
2918
if(ret_errno != 0){
2293
2919
errno = ret_errno;
2294
2920
perror_plus("argz_add");
2921
free(direntries[i]);
2295
2922
continue;
2296
2923
}
2297
2924
if(debug){
2298
2925
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2299
2926
direntries[i]->d_name);
2300
2927
}
2928
free(direntries[i]);
2301
2929
}
2302
2930
free(direntries);
2303
2931
} else {
2304
free(direntries);
2932
if(ret == 0){
2933
free(direntries);
2934
}
2305
2935
fprintf_plus(stderr, "Could not find a network interface\n");
2306
2936
exitcode = EXIT_FAILURE;
2307
2937
goto end;
2333
2963
errno = bring_up_interface(interface, delay);
2334
2964
if(not interface_was_up){
2335
2965
if(errno != 0){
2336
perror_plus("Failed to bring up interface");
2966
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2967
" %s\n", interface, strerror(errno));
2337
2968
} else {
2338
2969
errno = argz_add(&interfaces_to_take_down,
2339
2970
&interfaces_to_take_down_size,
2362
2993
goto end;
2363
2994
}
2364
2995
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2996
#if GNUTLS_VERSION_NUMBER >= 0x030606
2997
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2998
#elif GNUTLS_VERSION_NUMBER < 0x030600
2999
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3000
#else
3001
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3002
#endif
2366
3003
if(ret == -1){
2367
3004
fprintf_plus(stderr, "init_gnutls_global failed\n");
2368
3005
exitcode = EX_UNAVAILABLE;
2490
3127
2491
3128
/* Allocate a new server */
2492
3129
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2493
&config, NULL, NULL, &ret_errno);
3130
&config, NULL, NULL, &ret);
2494
3131
2495
3132
/* Free the Avahi configuration data */
2496
3133
avahi_server_config_free(&config);
2499
3136
/* Check if creating the Avahi server object succeeded */
2500
3137
if(mc.server == NULL){
2501
3138
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2502
avahi_strerror(ret_errno));
3139
avahi_strerror(ret));
2503
3140
exitcode = EX_UNAVAILABLE;
2504
3141
goto end;
2505
3142
}
2540
3177
end:
2541
3178
2542
3179
if(debug){
2543
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3180
if(signal_received){
3181
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3182
argv[0], signal_received,
3183
strsignal(signal_received));
3184
} else {
3185
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3186
}
2544
3187
}
2545
3188
2546
3189
/* Cleanup things */
2557
3200
2558
3201
if(gnutls_initialized){
2559
3202
gnutls_certificate_free_credentials(mc.cred);
2560
gnutls_global_deinit();
2561
3203
gnutls_dh_params_deinit(mc.dh_params);
2562
3204
}
2563
3205
2571
3213
mc.current_server->prev->next = NULL;
2572
3214
while(mc.current_server != NULL){
2573
3215
server *next = mc.current_server->next;
3216
#ifdef __GNUC__
3217
#pragma GCC diagnostic push
3218
#pragma GCC diagnostic ignored "-Wcast-qual"
3219
#endif
3220
free((char *)(mc.current_server->ip));
3221
#ifdef __GNUC__
3222
#pragma GCC diagnostic pop
3223
#endif
2574
3224
free(mc.current_server);
2575
3225
mc.current_server = next;
2576
3226
}
2578
3228
2579
3229
/* Re-raise privileges */
2580
3230
{
2581
ret_errno = raise_privileges();
2582
if(ret_errno != 0){
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
2583
3234
perror_plus("Failed to raise privileges");
2584
3235
} else {
2585
3236
2590
3241
/* Take down the network interfaces which were brought up */
2591
3242
{
2592
3243
char *interface = NULL;
2593
while((interface=argz_next(interfaces_to_take_down,
2594
interfaces_to_take_down_size,
2595
interface))){
2596
ret_errno = take_down_interface(interface);
2597
if(ret_errno != 0){
2598
errno = ret_errno;
3244
while((interface = argz_next(interfaces_to_take_down,
3245
interfaces_to_take_down_size,
3246
interface))){
3247
ret = take_down_interface(interface);
3248
if(ret != 0){
3249
errno = ret;
2599
3250
perror_plus("Failed to take down interface");
2600
3251
}
2601
3252
}
2606
3257
}
2607
3258
}
2608
3259
2609
ret_errno = lower_privileges_permanently();
2610
if(ret_errno != 0){
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
2611
3263
perror_plus("Failed to lower privileges permanently");
2612
3264
}
2613
3265
}
2615
3267
free(interfaces_to_take_down);
2616
3268
free(interfaces_hooks);
2617
3269
3270
void clean_dir_at(int base, const char * const dirname,
3271
uintmax_t level){
3272
struct dirent **direntries = NULL;
3273
int dret;
3274
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3275
O_RDONLY
3276
| O_NOFOLLOW
3277
| O_DIRECTORY
3278
| O_PATH));
3279
if(dir_fd == -1){
3280
perror_plus("open");
3281
return;
3282
}
3283
int numentries = scandirat(dir_fd, ".", &direntries,
3284
notdotentries, alphasort);
3285
if(numentries >= 0){
3286
for(int i = 0; i < numentries; i++){
3287
if(debug){
3288
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3289
dirname, direntries[i]->d_name);
3290
}
3291
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3292
if(dret == -1){
3293
if(errno == EISDIR){
3294
dret = unlinkat(dir_fd, direntries[i]->d_name,
3295
AT_REMOVEDIR);
3296
}
3297
if((dret == -1) and (errno == ENOTEMPTY)
3298
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3299
== 0) and (level == 0)){
3300
/* Recurse only in this special case */
3301
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3302
dret = 0;
3303
}
3304
if((dret == -1) and (errno != ENOENT)){
3305
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3306
direntries[i]->d_name, strerror(errno));
3307
}
3308
}
3309
free(direntries[i]);
3310
}
3311
3312
/* need to clean even if 0 because man page doesn't specify */
3313
free(direntries);
3314
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3315
if(dret == -1 and errno != ENOENT){
3316
perror_plus("rmdir");
3317
}
3318
} else {
3319
perror_plus("scandirat");
3320
}
3321
close(dir_fd);
3322
}
3323
2618
3324
/* Removes the GPGME temp directory and all files inside */
2619
3325
if(tempdir != NULL){
2620
struct dirent **direntries = NULL;
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
int numentries = scandir(tempdir, &direntries, notdotentries,
2626
alphasort);
2627
if(numentries > 0){
2628
for(int i = 0; i < numentries; i++){
2629
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2630
if(ret == -1){
2631
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2632
" \"%s\", 0): %s\n", tempdir,
2633
direntries[i]->d_name, strerror(errno));
2634
}
2635
}
2636
2637
/* need to clean even if 0 because man page doesn't specify */
2638
free(direntries);
2639
if(numentries == -1){
2640
perror_plus("scandir");
2641
}
2642
ret = rmdir(tempdir);
2643
if(ret == -1 and errno != ENOENT){
2644
perror_plus("rmdir");
2645
}
2646
}
2647
TEMP_FAILURE_RETRY(close(tempdir_fd));
2648
}
3326
clean_dir_at(-1, tempdir, 0);
2649
3327
}
2650
3328
2651
3329
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0