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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:59:20 UTC
- Revision ID: teddy@recompile.se-20140607215920-r4qkj7ktnjyqmrn5
Make mandos-client use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
* plugins.d/mandos-client.d (run_network_hooks): Use fexecve().
- 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
*/
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
123
116
gnutls_*
124
117
init_gnutls_session(),
125
118
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
119
#include <gnutls/openpgp.h>
128
120
/* gnutls_certificate_set_openpgp_key_file(),
129
121
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
122
136
123
/* GPGME */
137
124
#include <gpgme.h> /* All GPGME types, constants and
145
132
#define PATHDIR "/conf/conf.d/mandos"
146
133
#define SECKEY "seckey.txt"
147
134
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
136
152
137
bool debug = false;
248
233
.af = af };
249
234
if(new_server->ip == NULL){
250
235
perror_plus("strdup");
251
free(new_server);
252
236
return false;
253
237
}
254
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
239
if(ret == -1){
256
240
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
241
return false;
267
242
}
268
243
/* Special case of first server */
280
255
return true;
281
256
}
282
257
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
258
/*
336
259
* Initialize GPGME.
337
260
*/
357
280
return false;
358
281
}
359
282
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
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
284
if(rc != GPG_ERR_NO_ERROR){
412
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
420
293
gpgme_strsource(rc), gpgme_strerror(rc));
421
294
return false;
422
295
}
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
296
499
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
298
if(ret == -1){
501
299
perror_plus("close");
502
300
}
541
339
/* Create new GPGME "context" */
542
340
rc = gpgme_new(&(mc->ctx));
543
341
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
546
345
return false;
547
346
}
548
347
584
383
/* Create new empty GPGME data buffer for the plaintext */
585
384
rc = gpgme_data_new(&dh_plain);
586
385
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
588
388
gpgme_strsource(rc), gpgme_strerror(rc));
589
389
gpgme_data_release(dh_crypto);
590
390
return -1;
603
403
if(result == NULL){
604
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
405
} 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");
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
612
410
if(result->file_name != NULL){
613
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
412
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
413
gpgme_recipient_t recipient;
414
recipient = result->recipients;
415
while(recipient != NULL){
618
416
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);
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
420
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
623
424
}
624
425
}
625
426
}
681
482
return plaintext_length;
682
483
}
683
484
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
485
__attribute__((warn_unused_result))
692
486
static const char *safer_gnutls_strerror(int value){
693
487
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
695
491
}
696
492
697
493
/* GnuTLS log function callback */
701
497
fprintf_plus(stderr, "GnuTLS: %s", string);
702
498
}
703
499
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
705
501
static int init_gnutls_global(const char *pubkeyfilename,
706
502
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
503
mandos_context *mc){
709
504
int ret;
710
505
712
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
508
}
714
509
510
ret = gnutls_global_init();
511
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
514
return -1;
515
}
516
715
517
if(debug){
716
518
/* "Use a log level over 10 to enable all debugging options."
717
519
* - GnuTLS manual
725
527
if(ret != GNUTLS_E_SUCCESS){
726
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
728
531
return -1;
729
532
}
730
533
731
534
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
734
537
pubkeyfilename,
735
538
seckeyfilename);
736
539
}
737
540
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
541
ret = gnutls_certificate_set_openpgp_key_file
752
542
(mc->cred, pubkeyfilename, seckeyfilename,
753
543
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
544
if(ret != GNUTLS_E_SUCCESS){
758
545
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
549
safer_gnutls_strerror(ret));
771
558
safer_gnutls_strerror(ret));
772
559
goto globalfail;
773
560
}
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
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
565
goto globalfail;
566
}
567
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
956
569
957
570
return 0;
958
571
959
572
globalfail:
960
573
961
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
962
576
gnutls_dh_params_deinit(mc->dh_params);
963
577
return -1;
964
578
}
969
583
int ret;
970
584
/* GnuTLS session creation */
971
585
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
));
586
ret = gnutls_init(session, GNUTLS_SERVER);
980
587
if(quit_now){
981
588
return -1;
982
589
}
1023
630
/* ignore client certificate if any. */
1024
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
1026
635
return 0;
1027
636
}
1028
637
1030
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
640
__attribute__((unused)) const char *txt){}
1032
641
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
1199
642
/* Called when a Mandos server is found */
1200
643
__attribute__((nonnull, warn_unused_result))
1201
644
static int start_mandos_communication(const char *ip, in_port_t port,
1212
655
int retval = -1;
1213
656
gnutls_session_t session;
1214
657
int pf; /* Protocol family */
1215
bool route_added = false;
1216
658
1217
659
errno = 0;
1218
660
1240
682
bool match = false;
1241
683
{
1242
684
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1246
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1247
688
match = true;
1248
689
break;
1277
718
PRIuMAX "\n", ip, (uintmax_t)port);
1278
719
}
1279
720
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1281
722
if(tcp_sd < 0){
1282
723
int e = errno;
1283
724
perror_plus("socket");
1290
731
goto mandos_end;
1291
732
}
1292
733
734
memset(&to, 0, sizeof(to));
1293
735
if(af == AF_INET6){
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);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1297
738
} else { /* IPv4 */
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);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1301
741
}
1302
742
if(ret < 0 ){
1303
743
int e = errno;
1373
813
goto mandos_end;
1374
814
}
1375
815
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;
816
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
819
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
822
}
823
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
1431
835
}
1432
836
1433
837
const char *out = mandos_protocol_version;
1587
991
&decrypted_buffer, mc);
1588
992
if(decrypted_buffer_size >= 0){
1589
993
1590
clearerr(stdout);
1591
994
written = 0;
1592
995
while(written < (size_t) decrypted_buffer_size){
1593
996
if(quit_now){
1609
1012
}
1610
1013
written += (size_t)ret;
1611
1014
}
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
}
1622
1015
retval = 0;
1623
1016
}
1624
1017
}
1627
1020
1628
1021
mandos_end:
1629
1022
{
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
}
1636
1023
int e = errno;
1637
1024
free(decrypted_buffer);
1638
1025
free(buffer);
1639
1026
if(tcp_sd >= 0){
1640
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1641
1028
}
1642
1029
if(ret == -1){
1643
1030
if(e == 0){
1655
1042
return retval;
1656
1043
}
1657
1044
1045
__attribute__((nonnull))
1658
1046
static void resolve_callback(AvahiSServiceResolver *r,
1659
1047
AvahiIfIndex interface,
1660
1048
AvahiProtocol proto,
1677
1065
timed out */
1678
1066
1679
1067
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1681
1068
return;
1682
1069
}
1683
1070
1797
1184
__attribute__((nonnull, warn_unused_result))
1798
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
1186
int ret;
1800
int old_errno;
1187
error_t ret_errno;
1801
1188
1802
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
1190
if(s < 0){
1804
old_errno = errno;
1191
ret_errno = errno;
1805
1192
perror_plus("socket");
1806
errno = old_errno;
1193
errno = ret_errno;
1807
1194
return false;
1808
1195
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1811
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
1198
if(ret == -1){
1813
1199
if(debug){
1814
old_errno = errno;
1200
ret_errno = errno;
1815
1201
perror_plus("ioctl SIOCGIFFLAGS");
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1202
errno = ret_errno;
1822
1203
}
1823
1204
return false;
1824
1205
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
1206
return true;
1831
1207
}
1832
1208
1970
1346
return 0;
1971
1347
}
1972
1348
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1974
1357
if(ret == -1){
1975
1358
if(debug){
1976
1359
perror_plus("Could not stat hook");
1977
1360
}
1978
1361
return 0;
1979
1362
}
1363
free(fullname);
1980
1364
if(not (S_ISREG(st.st_mode))){
1981
1365
/* Not a regular file */
1982
1366
if(debug){
2074
1458
}
2075
1459
}
2076
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
2077
1536
__attribute__((nonnull))
2078
1537
void run_network_hooks(const char *mode, const char *interface,
2079
1538
const float delay){
2080
struct dirent **direntries = NULL;
1539
struct dirent **direntries;
2081
1540
if(hookdir_fd == -1){
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2083
| O_CLOEXEC);
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
2084
1548
if(hookdir_fd == -1){
2085
1549
if(errno == ENOENT){
2086
1550
if(debug){
2092
1556
}
2093
1557
return;
2094
1558
}
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
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
2101
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
2103
1583
if(numhooks == -1){
2104
1584
perror_plus("scandir");
2105
close(devnull);
2106
1585
return;
2107
1586
}
2108
1587
struct dirent *direntry;
2109
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
2110
1590
for(int i = 0; i < numhooks; i++){
2111
1591
direntry = direntries[i];
2112
1592
if(debug){
2117
1597
if(hook_pid == 0){
2118
1598
/* Child */
2119
1599
/* Raise privileges */
2120
errno = raise_privileges_permanently();
2121
if(errno != 0){
1600
if(raise_privileges_permanently() != 0){
2122
1601
perror_plus("Failed to raise privileges");
2123
1602
_exit(EX_NOPERM);
2124
1603
}
2136
1615
perror_plus("setgroups");
2137
1616
_exit(EX_NOPERM);
2138
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
2139
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2140
1634
if(ret == -1){
2141
1635
perror_plus("setenv");
2176
1670
_exit(EX_OSERR);
2177
1671
}
2178
1672
}
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){
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
2207
1675
perror_plus("fexecve");
2208
1676
_exit(EXIT_FAILURE);
2209
1677
}
2210
1678
} else {
2211
if(hook_pid == -1){
2212
perror_plus("fork");
2213
free(direntry);
2214
continue;
2215
}
2216
1679
int status;
2217
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2218
1681
perror_plus("waitpid");
2219
free(direntry);
2220
1682
continue;
2221
1683
}
2222
1684
if(WIFEXITED(status)){
2224
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2225
1687
" with status %d\n", direntry->d_name,
2226
1688
WEXITSTATUS(status));
2227
free(direntry);
2228
1689
continue;
2229
1690
}
2230
1691
} else if(WIFSIGNALED(status)){
2231
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2232
1693
" signal %d\n", direntry->d_name,
2233
1694
WTERMSIG(status));
2234
free(direntry);
2235
1695
continue;
2236
1696
} else {
2237
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
2238
1698
" crashed\n", direntry->d_name);
2239
free(direntry);
2240
1699
continue;
2241
1700
}
2242
1701
}
2244
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2245
1704
direntry->d_name);
2246
1705
}
2247
free(direntry);
2248
1706
}
2249
free(direntries);
2250
if(close(hookdir_fd) == -1){
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2251
1708
perror_plus("close");
2252
1709
} else {
2253
1710
hookdir_fd = -1;
2256
1713
}
2257
1714
2258
1715
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
2262
1719
int ret;
2263
1720
struct ifreq network;
2264
1721
unsigned int if_index = if_nametoindex(interface);
2274
1731
}
2275
1732
2276
1733
if(not interface_is_up(interface)){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
1734
error_t ret_errno = 0, ioctl_errno = 0;
2279
1735
if(not get_flags(interface, &network)){
2280
1736
ret_errno = errno;
2281
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2294
1750
}
2295
1751
2296
1752
if(quit_now){
2297
ret = close(sd);
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2298
1754
if(ret == -1){
2299
1755
perror_plus("close");
2300
1756
}
2310
1766
/* Raise privileges */
2311
1767
ret_errno = raise_privileges();
2312
1768
if(ret_errno != 0){
2313
errno = ret_errno;
2314
1769
perror_plus("Failed to raise privileges");
2315
1770
}
2316
1771
2350
1805
}
2351
1806
2352
1807
/* Close the socket */
2353
ret = close(sd);
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2354
1809
if(ret == -1){
2355
1810
perror_plus("close");
2356
1811
}
2368
1823
2369
1824
/* Sleep checking until interface is running.
2370
1825
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
1826
for(int i=0; i < delay * 4; i++){
2372
1827
if(interface_is_running(interface)){
2373
1828
break;
2374
1829
}
2384
1839
}
2385
1840
2386
1841
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
2389
1844
struct ifreq network;
2390
1845
unsigned int if_index = if_nametoindex(interface);
2391
1846
if(if_index == 0){
2394
1849
return ENXIO;
2395
1850
}
2396
1851
if(interface_is_up(interface)){
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
1852
error_t ret_errno = 0, ioctl_errno = 0;
2399
1853
if(not get_flags(interface, &network) and debug){
2400
1854
ret_errno = errno;
2401
1855
fprintf_plus(stderr, "Failed to get flags for interface "
2421
1875
/* Raise privileges */
2422
1876
ret_errno = raise_privileges();
2423
1877
if(ret_errno != 0){
2424
errno = ret_errno;
2425
1878
perror_plus("Failed to raise privileges");
2426
1879
}
2427
1880
2439
1892
}
2440
1893
2441
1894
/* Close the socket */
2442
int ret = close(sd);
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2443
1896
if(ret == -1){
2444
1897
perror_plus("close");
2445
1898
}
2460
1913
}
2461
1914
2462
1915
int main(int argc, char *argv[]){
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 };
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
2476
1920
AvahiSServiceBrowser *sb = NULL;
2477
1921
error_t ret_errno;
2478
1922
int ret;
2487
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
1932
const char *seckey = PATHDIR "/" SECKEY;
2489
1933
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;
2495
1934
char *interfaces_hooks = NULL;
2496
1935
2497
1936
bool gnutls_initialized = false;
2544
1983
{ .name = "pubkey", .key = 'p',
2545
1984
.arg = "FILE",
2546
1985
.doc = "OpenPGP public key file base name",
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 },
1986
.group = 2 },
2564
1987
{ .name = "dh-bits", .key = 129,
2565
1988
.arg = "BITS",
2566
1989
.doc = "Bit length of the prime number used in the"
2567
1990
" Diffie-Hellman key exchange",
2568
1991
.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 },
2574
1992
{ .name = "priority", .key = 130,
2575
1993
.arg = "STRING",
2576
1994
.doc = "GnuTLS priority string for the TLS handshake",
2622
2040
case 'p': /* --pubkey */
2623
2041
pubkey = arg;
2624
2042
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;
2635
2043
case 129: /* --dh-bits */
2636
2044
errno = 0;
2637
2045
tmpmax = strtoimax(arg, &tmp, 10);
2641
2049
}
2642
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2643
2051
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2647
2052
case 130: /* --priority */
2648
2053
mc.priority = arg;
2649
2054
break;
2672
2077
argp_state_help(state, state->out_stream,
2673
2078
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
2079
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2676
2080
case -3: /* --usage */
2677
2081
argp_state_help(state, state->out_stream,
2678
2082
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2680
2083
case 'V': /* --version */
2681
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2682
2085
exit(argp_err_exit_status);
2691
2094
.args_doc = "",
2692
2095
.doc = "Mandos client -- Get and decrypt"
2693
2096
" passwords from a Mandos server" };
2694
ret_errno = argp_parse(&argp, argc, argv,
2695
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2696
switch(ret_errno){
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2697
2100
case 0:
2698
2101
break;
2699
2102
case ENOMEM:
2700
2103
default:
2701
errno = ret_errno;
2104
errno = ret;
2702
2105
perror_plus("argp_parse");
2703
2106
exitcode = EX_OSERR;
2704
2107
goto end;
2707
2110
goto end;
2708
2111
}
2709
2112
}
2710
2113
2711
2114
{
2712
2115
/* Work around Debian bug #633582:
2713
<https://bugs.debian.org/633582> */
2116
<http://bugs.debian.org/633582> */
2714
2117
2715
2118
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2719
2122
perror_plus("Failed to raise privileges");
2720
2123
} else {
2721
2124
struct stat st;
2737
2140
}
2738
2141
}
2739
2142
}
2740
close(seckey_fd);
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2741
2144
}
2742
2145
}
2743
2146
2744
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2745
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2746
2149
if(pubkey_fd == -1){
2758
2161
}
2759
2162
}
2760
2163
}
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
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2787
2168
/* Lower privileges */
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2791
2172
perror_plus("Failed to lower privileges");
2792
2173
}
2793
2174
}
2906
2287
2907
2288
/* If no interfaces were specified, make a list */
2908
2289
if(mc.interfaces == NULL){
2909
struct dirent **direntries = NULL;
2290
struct dirent **direntries;
2910
2291
/* Look for any good interfaces */
2911
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2912
2293
alphasort);
2918
2299
if(ret_errno != 0){
2919
2300
errno = ret_errno;
2920
2301
perror_plus("argz_add");
2921
free(direntries[i]);
2922
2302
continue;
2923
2303
}
2924
2304
if(debug){
2925
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2926
2306
direntries[i]->d_name);
2927
2307
}
2928
free(direntries[i]);
2929
2308
}
2930
2309
free(direntries);
2931
2310
} else {
2932
if(ret == 0){
2933
free(direntries);
2934
}
2311
free(direntries);
2935
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2936
2313
exitcode = EXIT_FAILURE;
2937
2314
goto end;
2963
2340
errno = bring_up_interface(interface, delay);
2964
2341
if(not interface_was_up){
2965
2342
if(errno != 0){
2966
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2967
" %s\n", interface, strerror(errno));
2343
perror_plus("Failed to bring up interface");
2968
2344
} else {
2969
2345
errno = argz_add(&interfaces_to_take_down,
2970
2346
&interfaces_to_take_down_size,
2993
2369
goto end;
2994
2370
}
2995
2371
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
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
3003
2373
if(ret == -1){
3004
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
3005
2375
exitcode = EX_UNAVAILABLE;
3127
2497
3128
2498
/* Allocate a new server */
3129
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3130
&config, NULL, NULL, &ret);
2500
&config, NULL, NULL, &ret_errno);
3131
2501
3132
2502
/* Free the Avahi configuration data */
3133
2503
avahi_server_config_free(&config);
3136
2506
/* Check if creating the Avahi server object succeeded */
3137
2507
if(mc.server == NULL){
3138
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3139
avahi_strerror(ret));
2509
avahi_strerror(ret_errno));
3140
2510
exitcode = EX_UNAVAILABLE;
3141
2511
goto end;
3142
2512
}
3177
2547
end:
3178
2548
3179
2549
if(debug){
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
}
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
2551
}
3188
2552
3189
2553
/* Cleanup things */
3200
2564
3201
2565
if(gnutls_initialized){
3202
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
3203
2568
gnutls_dh_params_deinit(mc.dh_params);
3204
2569
}
3205
2570
3213
2578
mc.current_server->prev->next = NULL;
3214
2579
while(mc.current_server != NULL){
3215
2580
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
3224
2581
free(mc.current_server);
3225
2582
mc.current_server = next;
3226
2583
}
3228
2585
3229
2586
/* Re-raise privileges */
3230
2587
{
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
3234
2590
perror_plus("Failed to raise privileges");
3235
2591
} else {
3236
2592
3241
2597
/* Take down the network interfaces which were brought up */
3242
2598
{
3243
2599
char *interface = NULL;
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;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
3250
2606
perror_plus("Failed to take down interface");
3251
2607
}
3252
2608
}
3257
2613
}
3258
2614
}
3259
2615
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
3263
2618
perror_plus("Failed to lower privileges permanently");
3264
2619
}
3265
2620
}
3267
2622
free(interfaces_to_take_down);
3268
2623
free(interfaces_hooks);
3269
2624
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
3324
2625
/* Removes the GPGME temp directory and all files inside */
3325
2626
if(tempdir != NULL){
3326
clean_dir_at(-1, tempdir, 0);
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
2634
char *fullname = NULL;
2635
ret = asprintf(&fullname, "%s/%s", tempdir,
2636
direntry->d_name);
2637
if(ret < 0){
2638
perror_plus("asprintf");
2639
continue;
2640
}
2641
ret = remove(fullname);
2642
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2645
}
2646
free(fullname);
2647
}
2648
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2651
free(direntries);
2652
if(numentries == -1){
2653
perror_plus("scandir");
2654
}
2655
ret = rmdir(tempdir);
2656
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
2658
}
3327
2659
}
3328
2660
3329
2661
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0