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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 © 2008-2020 Teddy Hogeborn
13
* Copyright © 2008-2020 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2014 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
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
401
}
402
ret = lower_privileges();
403
if(ret != 0){
404
errno = ret;
405
perror_plus("Failed to lower privileges");
406
}
407
} while(false);
408
409
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
410
284
if(rc != GPG_ERR_NO_ERROR){
411
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
419
293
gpgme_strsource(rc), gpgme_strerror(rc));
420
294
return false;
421
295
}
422
{
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
429
fprintf_plus(stderr,
430
"The total number of considered keys: %d\n",
431
import_result->considered);
432
fprintf_plus(stderr,
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
435
fprintf_plus(stderr,
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
450
fprintf_plus(stderr,
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
453
fprintf_plus(stderr,
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
456
fprintf_plus(stderr,
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
466
import_status->fpr);
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
471
}
472
fprintf_plus(stderr, "Key status:\n");
473
fprintf_plus(stderr,
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
477
fprintf_plus(stderr,
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
481
fprintf_plus(stderr,
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
485
fprintf_plus(stderr,
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
489
fprintf_plus(stderr,
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
493
}
494
return false;
495
}
496
}
497
296
498
ret = close(fd);
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
298
if(ret == -1){
500
299
perror_plus("close");
501
300
}
540
339
/* Create new GPGME "context" */
541
340
rc = gpgme_new(&(mc->ctx));
542
341
if(rc != GPG_ERR_NO_ERROR){
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
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));
545
345
return false;
546
346
}
547
347
583
383
/* Create new empty GPGME data buffer for the plaintext */
584
384
rc = gpgme_data_new(&dh_plain);
585
385
if(rc != GPG_ERR_NO_ERROR){
586
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",
587
388
gpgme_strsource(rc), gpgme_strerror(rc));
588
389
gpgme_data_release(dh_crypto);
589
390
return -1;
602
403
if(result == NULL){
603
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
604
405
} else {
605
if(result->unsupported_algorithm != NULL) {
606
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
607
result->unsupported_algorithm);
608
}
609
fprintf_plus(stderr, "Wrong key usage: %s\n",
610
result->wrong_key_usage ? "Yes" : "No");
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);
611
410
if(result->file_name != NULL){
612
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
613
412
}
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
413
gpgme_recipient_t recipient;
414
recipient = result->recipients;
415
while(recipient != NULL){
617
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
620
420
fprintf_plus(stderr, "Secret key available: %s\n",
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
622
424
}
623
425
}
624
426
}
680
482
return plaintext_length;
681
483
}
682
484
683
__attribute__((warn_unused_result, const))
684
static const char *safe_string(const char *str){
685
if(str == NULL)
686
return "(unknown)";
687
return str;
688
}
689
690
485
__attribute__((warn_unused_result))
691
486
static const char *safer_gnutls_strerror(int value){
692
487
const char *ret = gnutls_strerror(value);
693
return safe_string(ret);
488
if(ret == NULL)
489
ret = "(unknown)";
490
return ret;
694
491
}
695
492
696
493
/* GnuTLS log function callback */
700
497
fprintf_plus(stderr, "GnuTLS: %s", string);
701
498
}
702
499
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
500
__attribute__((nonnull, warn_unused_result))
704
501
static int init_gnutls_global(const char *pubkeyfilename,
705
502
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
503
mandos_context *mc){
708
504
int ret;
709
505
711
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
712
508
}
713
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
714
517
if(debug){
715
518
/* "Use a log level over 10 to enable all debugging options."
716
519
* - GnuTLS manual
724
527
if(ret != GNUTLS_E_SUCCESS){
725
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
529
safer_gnutls_strerror(ret));
530
gnutls_global_deinit();
727
531
return -1;
728
532
}
729
533
730
534
if(debug){
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" 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",
733
537
pubkeyfilename,
734
538
seckeyfilename);
735
539
}
736
540
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
741
NULL, /* pass */
742
/* key_usage */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
744
NULL, /* names */
745
0, /* names_length */
746
/* privkey_flags */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
750
541
ret = gnutls_certificate_set_openpgp_key_file
751
542
(mc->cred, pubkeyfilename, seckeyfilename,
752
543
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
756
544
if(ret != GNUTLS_E_SUCCESS){
757
545
fprintf_plus(stderr,
758
"Error[%d] while reading the key pair ('%s',"
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
549
safer_gnutls_strerror(ret));
770
558
safer_gnutls_strerror(ret));
771
559
goto globalfail;
772
560
}
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
776
do {
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
778
if(dhpfile == -1){
779
perror_plus("open");
780
dhparamsfilename = NULL;
781
break;
782
}
783
size_t params_capacity = 0;
784
while(true){
785
params_capacity = incbuffer((char **)¶ms.data,
786
(size_t)params.size,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
790
free(params.data);
791
params.data = NULL;
792
dhparamsfilename = NULL;
793
break;
794
}
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
797
BUFFER_SIZE);
798
/* EOF */
799
if(bytes_read == 0){
800
break;
801
}
802
/* check bytes_read for failure */
803
if(bytes_read < 0){
804
perror_plus("read");
805
free(params.data);
806
params.data = NULL;
807
dhparamsfilename = NULL;
808
break;
809
}
810
params.size += (unsigned int)bytes_read;
811
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
818
}
819
if(dhparamsfilename == NULL){
820
break;
821
}
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
829
}
830
free(params.data);
831
} while(false);
832
}
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
839
do {
840
int secfile = open(seckeyfilename, O_RDONLY);
841
if(secfile == -1){
842
perror_plus("open");
843
break;
844
}
845
size_t buffer_capacity = 0;
846
while(true){
847
buffer_capacity = incbuffer((char **)&buffer.data,
848
(size_t)buffer.size,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
852
free(buffer.data);
853
buffer.data = NULL;
854
break;
855
}
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
858
BUFFER_SIZE);
859
/* EOF */
860
if(bytes_read == 0){
861
break;
862
}
863
/* check bytes_read for failure */
864
if(bytes_read < 0){
865
perror_plus("read");
866
free(buffer.data);
867
buffer.data = NULL;
868
break;
869
}
870
buffer.size += (unsigned int)bytes_read;
871
}
872
close(secfile);
873
} while(false);
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
877
{
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
882
" structure: %s",
883
safer_gnutls_strerror(ret));
884
free(buffer.data);
885
buffer.data = NULL;
886
} else {
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
892
privkey = NULL;
893
}
894
free(buffer.data);
895
buffer.data = NULL;
896
if(privkey != NULL){
897
/* Use private key to suggest an appropriate
898
sec_param */
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
901
if(debug){
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)));
906
}
907
}
908
}
909
}
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
913
if(debug){
914
fprintf_plus(stderr, "Falling back to security parameter"
915
" \"%s\"\n",
916
safe_string(gnutls_sec_param_get_name
917
(sec_param)));
918
}
919
}
920
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
if(uret != 0){
923
mc->dh_bits = uret;
924
if(debug){
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
928
(sec_param)),
929
mc->dh_bits);
930
}
931
} else {
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)),
936
safer_gnutls_strerror(ret));
937
goto globalfail;
938
}
939
#endif
940
} else { /* dh_bits != 0 */
941
if(debug){
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
943
mc->dh_bits);
944
}
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
950
goto globalfail;
951
}
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
953
}
954
}
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);
955
569
956
570
return 0;
957
571
958
572
globalfail:
959
573
960
574
gnutls_certificate_free_credentials(mc->cred);
575
gnutls_global_deinit();
961
576
gnutls_dh_params_deinit(mc->dh_params);
962
577
return -1;
963
578
}
968
583
int ret;
969
584
/* GnuTLS session creation */
970
585
do {
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
973
| GNUTLS_NO_TICKETS
974
#endif
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
977
#endif
978
));
586
ret = gnutls_init(session, GNUTLS_SERVER);
979
587
if(quit_now){
980
588
return -1;
981
589
}
1022
630
/* ignore client certificate if any. */
1023
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1024
632
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
634
1025
635
return 0;
1026
636
}
1027
637
1029
639
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1030
640
__attribute__((unused)) const char *txt){}
1031
641
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
1205
642
/* Called when a Mandos server is found */
1206
643
__attribute__((nonnull, warn_unused_result))
1207
644
static int start_mandos_communication(const char *ip, in_port_t port,
1218
655
int retval = -1;
1219
656
gnutls_session_t session;
1220
657
int pf; /* Protocol family */
1221
bool route_added = false;
1222
658
1223
659
errno = 0;
1224
660
1246
682
bool match = false;
1247
683
{
1248
684
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
1252
687
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
688
match = true;
1254
689
break;
1283
718
PRIuMAX "\n", ip, (uintmax_t)port);
1284
719
}
1285
720
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
722
if(tcp_sd < 0){
1288
723
int e = errno;
1289
724
perror_plus("socket");
1296
731
goto mandos_end;
1297
732
}
1298
733
734
memset(&to, 0, sizeof(to));
1299
735
if(af == AF_INET6){
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1303
738
} else { /* IPv4 */
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1307
741
}
1308
742
if(ret < 0 ){
1309
743
int e = errno;
1379
813
goto mandos_end;
1380
814
}
1381
815
1382
while(true){
1383
if(af == AF_INET6){
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1386
} else {
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1389
}
1390
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1397
&to)->sin6_addr)))
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1408
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1412
*/
1413
if(debug){
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1415
" direct route\n");
1416
}
1417
int e = errno;
1418
route_added = add_local_route(ip, if_index);
1419
if(route_added){
1420
continue;
1421
}
1422
errno = e;
1423
}
1424
if(errno != ECONNREFUSED or debug){
1425
int e = errno;
1426
perror_plus("connect");
1427
errno = e;
1428
}
1429
goto mandos_end;
1430
}
1431
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
break;
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;
1437
835
}
1438
836
1439
837
const char *out = mandos_protocol_version;
1593
991
&decrypted_buffer, mc);
1594
992
if(decrypted_buffer_size >= 0){
1595
993
1596
clearerr(stdout);
1597
994
written = 0;
1598
995
while(written < (size_t) decrypted_buffer_size){
1599
996
if(quit_now){
1615
1012
}
1616
1013
written += (size_t)ret;
1617
1014
}
1618
ret = fflush(stdout);
1619
if(ret != 0){
1620
int e = errno;
1621
if(debug){
1622
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1623
strerror(errno));
1624
}
1625
errno = e;
1626
goto mandos_end;
1627
}
1628
1015
retval = 0;
1629
1016
}
1630
1017
}
1633
1020
1634
1021
mandos_end:
1635
1022
{
1636
if(route_added){
1637
if(not delete_local_route(ip, if_index)){
1638
fprintf_plus(stderr, "Failed to delete local route to %s on"
1639
" interface %d", ip, if_index);
1640
}
1641
}
1642
1023
int e = errno;
1643
1024
free(decrypted_buffer);
1644
1025
free(buffer);
1645
1026
if(tcp_sd >= 0){
1646
ret = close(tcp_sd);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
1028
}
1648
1029
if(ret == -1){
1649
1030
if(e == 0){
1661
1042
return retval;
1662
1043
}
1663
1044
1045
__attribute__((nonnull))
1664
1046
static void resolve_callback(AvahiSServiceResolver *r,
1665
1047
AvahiIfIndex interface,
1666
1048
AvahiProtocol proto,
1683
1065
timed out */
1684
1066
1685
1067
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1687
1068
return;
1688
1069
}
1689
1070
1803
1184
__attribute__((nonnull, warn_unused_result))
1804
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1805
1186
int ret;
1806
int old_errno;
1187
error_t ret_errno;
1807
1188
1808
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1809
1190
if(s < 0){
1810
old_errno = errno;
1191
ret_errno = errno;
1811
1192
perror_plus("socket");
1812
errno = old_errno;
1193
errno = ret_errno;
1813
1194
return false;
1814
1195
}
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1196
strcpy(ifr->ifr_name, ifname);
1817
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1818
1198
if(ret == -1){
1819
1199
if(debug){
1820
old_errno = errno;
1200
ret_errno = errno;
1821
1201
perror_plus("ioctl SIOCGIFFLAGS");
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1202
errno = ret_errno;
1828
1203
}
1829
1204
return false;
1830
1205
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1836
1206
return true;
1837
1207
}
1838
1208
1976
1346
return 0;
1977
1347
}
1978
1348
1979
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);
1980
1357
if(ret == -1){
1981
1358
if(debug){
1982
1359
perror_plus("Could not stat hook");
1983
1360
}
1984
1361
return 0;
1985
1362
}
1363
free(fullname);
1986
1364
if(not (S_ISREG(st.st_mode))){
1987
1365
/* Not a regular file */
1988
1366
if(debug){
2080
1458
}
2081
1459
}
2082
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
2083
1536
__attribute__((nonnull))
2084
1537
void run_network_hooks(const char *mode, const char *interface,
2085
1538
const float delay){
2086
struct dirent **direntries = NULL;
1539
struct dirent **direntries;
2087
1540
if(hookdir_fd == -1){
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2089
| 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
);
2090
1548
if(hookdir_fd == -1){
2091
1549
if(errno == ENOENT){
2092
1550
if(debug){
2098
1556
}
2099
1557
return;
2100
1558
}
2101
}
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2103
if(devnull == -1){
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2105
return;
2106
}
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)
2107
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
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__ */
2109
1583
if(numhooks == -1){
2110
1584
perror_plus("scandir");
2111
close(devnull);
2112
1585
return;
2113
1586
}
2114
1587
struct dirent *direntry;
2115
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
2116
1590
for(int i = 0; i < numhooks; i++){
2117
1591
direntry = direntries[i];
2118
1592
if(debug){
2123
1597
if(hook_pid == 0){
2124
1598
/* Child */
2125
1599
/* Raise privileges */
2126
errno = raise_privileges_permanently();
2127
if(errno != 0){
1600
if(raise_privileges_permanently() != 0){
2128
1601
perror_plus("Failed to raise privileges");
2129
1602
_exit(EX_NOPERM);
2130
1603
}
2142
1615
perror_plus("setgroups");
2143
1616
_exit(EX_NOPERM);
2144
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
}
2145
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2146
1634
if(ret == -1){
2147
1635
perror_plus("setenv");
2182
1670
_exit(EX_OSERR);
2183
1671
}
2184
1672
}
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2186
direntry->d_name,
2187
O_RDONLY));
2188
if(hook_fd == -1){
2189
perror_plus("openat");
2190
_exit(EXIT_FAILURE);
2191
}
2192
if(close(hookdir_fd) == -1){
2193
perror_plus("close");
2194
_exit(EXIT_FAILURE);
2195
}
2196
ret = dup2(devnull, STDIN_FILENO);
2197
if(ret == -1){
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
_exit(EX_OSERR);
2200
}
2201
ret = close(devnull);
2202
if(ret == -1){
2203
perror_plus("close");
2204
_exit(EX_OSERR);
2205
}
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2207
if(ret == -1){
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2209
_exit(EX_OSERR);
2210
}
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2212
environ) == -1){
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
2213
1675
perror_plus("fexecve");
2214
1676
_exit(EXIT_FAILURE);
2215
1677
}
2216
1678
} else {
2217
if(hook_pid == -1){
2218
perror_plus("fork");
2219
free(direntry);
2220
continue;
2221
}
2222
1679
int status;
2223
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2224
1681
perror_plus("waitpid");
2225
free(direntry);
2226
1682
continue;
2227
1683
}
2228
1684
if(WIFEXITED(status)){
2230
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2231
1687
" with status %d\n", direntry->d_name,
2232
1688
WEXITSTATUS(status));
2233
free(direntry);
2234
1689
continue;
2235
1690
}
2236
1691
} else if(WIFSIGNALED(status)){
2237
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2238
1693
" signal %d\n", direntry->d_name,
2239
1694
WTERMSIG(status));
2240
free(direntry);
2241
1695
continue;
2242
1696
} else {
2243
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
2244
1698
" crashed\n", direntry->d_name);
2245
free(direntry);
2246
1699
continue;
2247
1700
}
2248
1701
}
2250
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2251
1704
direntry->d_name);
2252
1705
}
2253
free(direntry);
2254
1706
}
2255
free(direntries);
2256
if(close(hookdir_fd) == -1){
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2257
1708
perror_plus("close");
2258
1709
} else {
2259
1710
hookdir_fd = -1;
2262
1713
}
2263
1714
2264
1715
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
2268
1719
int ret;
2269
1720
struct ifreq network;
2270
1721
unsigned int if_index = if_nametoindex(interface);
2280
1731
}
2281
1732
2282
1733
if(not interface_is_up(interface)){
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
1734
error_t ret_errno = 0, ioctl_errno = 0;
2285
1735
if(not get_flags(interface, &network)){
2286
1736
ret_errno = errno;
2287
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2300
1750
}
2301
1751
2302
1752
if(quit_now){
2303
ret = close(sd);
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2304
1754
if(ret == -1){
2305
1755
perror_plus("close");
2306
1756
}
2316
1766
/* Raise privileges */
2317
1767
ret_errno = raise_privileges();
2318
1768
if(ret_errno != 0){
2319
errno = ret_errno;
2320
1769
perror_plus("Failed to raise privileges");
2321
1770
}
2322
1771
2356
1805
}
2357
1806
2358
1807
/* Close the socket */
2359
ret = close(sd);
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2360
1809
if(ret == -1){
2361
1810
perror_plus("close");
2362
1811
}
2374
1823
2375
1824
/* Sleep checking until interface is running.
2376
1825
Check every 0.25s, up to total time of delay */
2377
for(int i = 0; i < delay * 4; i++){
1826
for(int i=0; i < delay * 4; i++){
2378
1827
if(interface_is_running(interface)){
2379
1828
break;
2380
1829
}
2390
1839
}
2391
1840
2392
1841
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
2395
1844
struct ifreq network;
2396
1845
unsigned int if_index = if_nametoindex(interface);
2397
1846
if(if_index == 0){
2400
1849
return ENXIO;
2401
1850
}
2402
1851
if(interface_is_up(interface)){
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
1852
error_t ret_errno = 0, ioctl_errno = 0;
2405
1853
if(not get_flags(interface, &network) and debug){
2406
1854
ret_errno = errno;
2407
1855
fprintf_plus(stderr, "Failed to get flags for interface "
2427
1875
/* Raise privileges */
2428
1876
ret_errno = raise_privileges();
2429
1877
if(ret_errno != 0){
2430
errno = ret_errno;
2431
1878
perror_plus("Failed to raise privileges");
2432
1879
}
2433
1880
2445
1892
}
2446
1893
2447
1894
/* Close the socket */
2448
int ret = close(sd);
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2449
1896
if(ret == -1){
2450
1897
perror_plus("close");
2451
1898
}
2466
1913
}
2467
1914
2468
1915
int main(int argc, char *argv[]){
2469
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2473
":%PROFILE_ULTRA",
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
#else
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
#endif
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
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 };
2482
1920
AvahiSServiceBrowser *sb = NULL;
2483
1921
error_t ret_errno;
2484
1922
int ret;
2493
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
1932
const char *seckey = PATHDIR "/" SECKEY;
2495
1933
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2499
#endif
2500
const char *dh_params_file = NULL;
2501
1934
char *interfaces_hooks = NULL;
2502
1935
2503
1936
bool gnutls_initialized = false;
2550
1983
{ .name = "pubkey", .key = 'p',
2551
1984
.arg = "FILE",
2552
1985
.doc = "OpenPGP public key file base name",
2553
.group = 1 },
2554
{ .name = "tls-privkey", .key = 't',
2555
.arg = "FILE",
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2558
#else
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2560
#endif
2561
.group = 1 },
2562
{ .name = "tls-pubkey", .key = 'T',
2563
.arg = "FILE",
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2566
#else
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2568
#endif
2569
.group = 1 },
1986
.group = 2 },
2570
1987
{ .name = "dh-bits", .key = 129,
2571
1988
.arg = "BITS",
2572
1989
.doc = "Bit length of the prime number used in the"
2573
1990
" Diffie-Hellman key exchange",
2574
1991
.group = 2 },
2575
{ .name = "dh-params", .key = 134,
2576
.arg = "FILE",
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2579
.group = 2 },
2580
1992
{ .name = "priority", .key = 130,
2581
1993
.arg = "STRING",
2582
1994
.doc = "GnuTLS priority string for the TLS handshake",
2628
2040
case 'p': /* --pubkey */
2629
2041
pubkey = arg;
2630
2042
break;
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2633
tls_privkey = arg;
2634
#endif
2635
break;
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2638
tls_pubkey = arg;
2639
#endif
2640
break;
2641
2043
case 129: /* --dh-bits */
2642
2044
errno = 0;
2643
2045
tmpmax = strtoimax(arg, &tmp, 10);
2647
2049
}
2648
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2649
2051
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
2653
2052
case 130: /* --priority */
2654
2053
mc.priority = arg;
2655
2054
break;
2678
2077
argp_state_help(state, state->out_stream,
2679
2078
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
2079
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
2080
case -3: /* --usage */
2683
2081
argp_state_help(state, state->out_stream,
2684
2082
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
2083
case 'V': /* --version */
2687
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
2085
exit(argp_err_exit_status);
2697
2094
.args_doc = "",
2698
2095
.doc = "Mandos client -- Get and decrypt"
2699
2096
" passwords from a Mandos server" };
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2099
switch(ret){
2703
2100
case 0:
2704
2101
break;
2705
2102
case ENOMEM:
2706
2103
default:
2707
errno = ret_errno;
2104
errno = ret;
2708
2105
perror_plus("argp_parse");
2709
2106
exitcode = EX_OSERR;
2710
2107
goto end;
2713
2110
goto end;
2714
2111
}
2715
2112
}
2716
2113
2717
2114
{
2718
2115
/* Work around Debian bug #633582:
2719
<https://bugs.debian.org/633582> */
2116
<http://bugs.debian.org/633582> */
2720
2117
2721
2118
/* Re-raise privileges */
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2725
2122
perror_plus("Failed to raise privileges");
2726
2123
} else {
2727
2124
struct stat st;
2743
2140
}
2744
2141
}
2745
2142
}
2746
close(seckey_fd);
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
2144
}
2748
2145
}
2749
2146
2750
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2751
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2752
2149
if(pubkey_fd == -1){
2764
2161
}
2765
2162
}
2766
2163
}
2767
close(pubkey_fd);
2768
}
2769
}
2770
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2776
} else {
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2778
if(ret == -1){
2779
perror_plus("fstat");
2780
} else {
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2784
if(ret == -1){
2785
perror_plus("fchown");
2786
}
2787
}
2788
}
2789
close(dhparams_fd);
2790
}
2791
}
2792
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2793
2168
/* Lower privileges */
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2797
2172
perror_plus("Failed to lower privileges");
2798
2173
}
2799
2174
}
2912
2287
2913
2288
/* If no interfaces were specified, make a list */
2914
2289
if(mc.interfaces == NULL){
2915
struct dirent **direntries = NULL;
2290
struct dirent **direntries;
2916
2291
/* Look for any good interfaces */
2917
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2918
2293
alphasort);
2924
2299
if(ret_errno != 0){
2925
2300
errno = ret_errno;
2926
2301
perror_plus("argz_add");
2927
free(direntries[i]);
2928
2302
continue;
2929
2303
}
2930
2304
if(debug){
2931
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2932
2306
direntries[i]->d_name);
2933
2307
}
2934
free(direntries[i]);
2935
2308
}
2936
2309
free(direntries);
2937
2310
} else {
2938
if(ret == 0){
2939
free(direntries);
2940
}
2311
free(direntries);
2941
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2942
2313
exitcode = EXIT_FAILURE;
2943
2314
goto end;
2969
2340
errno = bring_up_interface(interface, delay);
2970
2341
if(not interface_was_up){
2971
2342
if(errno != 0){
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2343
perror_plus("Failed to bring up interface");
2974
2344
} else {
2975
2345
errno = argz_add(&interfaces_to_take_down,
2976
2346
&interfaces_to_take_down_size,
2999
2369
goto end;
3000
2370
}
3001
2371
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3006
#else
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3008
#endif
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
3009
2373
if(ret == -1){
3010
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
3011
2375
exitcode = EX_UNAVAILABLE;
3133
2497
3134
2498
/* Allocate a new server */
3135
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3136
&config, NULL, NULL, &ret);
2500
&config, NULL, NULL, &ret_errno);
3137
2501
3138
2502
/* Free the Avahi configuration data */
3139
2503
avahi_server_config_free(&config);
3142
2506
/* Check if creating the Avahi server object succeeded */
3143
2507
if(mc.server == NULL){
3144
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3145
avahi_strerror(ret));
2509
avahi_strerror(ret_errno));
3146
2510
exitcode = EX_UNAVAILABLE;
3147
2511
goto end;
3148
2512
}
3183
2547
end:
3184
2548
3185
2549
if(debug){
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3190
} else {
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3192
}
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
2551
}
3194
2552
3195
2553
/* Cleanup things */
3206
2564
3207
2565
if(gnutls_initialized){
3208
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
3209
2568
gnutls_dh_params_deinit(mc.dh_params);
3210
2569
}
3211
2570
3219
2578
mc.current_server->prev->next = NULL;
3220
2579
while(mc.current_server != NULL){
3221
2580
server *next = mc.current_server->next;
3222
#ifdef __GNUC__
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3225
#endif
3226
free((char *)(mc.current_server->ip));
3227
#ifdef __GNUC__
3228
#pragma GCC diagnostic pop
3229
#endif
3230
2581
free(mc.current_server);
3231
2582
mc.current_server = next;
3232
2583
}
3234
2585
3235
2586
/* Re-raise privileges */
3236
2587
{
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
3240
2590
perror_plus("Failed to raise privileges");
3241
2591
} else {
3242
2592
3247
2597
/* Take down the network interfaces which were brought up */
3248
2598
{
3249
2599
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3252
interface))){
3253
ret = take_down_interface(interface);
3254
if(ret != 0){
3255
errno = ret;
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;
3256
2606
perror_plus("Failed to take down interface");
3257
2607
}
3258
2608
}
3263
2613
}
3264
2614
}
3265
2615
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
3269
2618
perror_plus("Failed to lower privileges permanently");
3270
2619
}
3271
2620
}
3273
2622
free(interfaces_to_take_down);
3274
2623
free(interfaces_hooks);
3275
2624
3276
void clean_dir_at(int base, const char * const dirname,
3277
uintmax_t level){
3278
struct dirent **direntries = NULL;
3279
int dret;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3281
O_RDONLY
3282
| O_NOFOLLOW
3283
| O_DIRECTORY
3284
| O_PATH));
3285
if(dir_fd == -1){
3286
perror_plus("open");
3287
return;
3288
}
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
3292
for(int i = 0; i < numentries; i++){
3293
if(debug){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3296
}
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3298
if(dret == -1){
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3301
AT_REMOVEDIR);
3302
}
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3308
dret = 0;
3309
}
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3313
}
3314
}
3315
free(direntries[i]);
3316
}
3317
3318
/* need to clean even if 0 because man page doesn't specify */
3319
free(direntries);
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3323
}
3324
} else {
3325
perror_plus("scandirat");
3326
}
3327
close(dir_fd);
3328
}
3329
3330
2625
/* Removes the GPGME temp directory and all files inside */
3331
2626
if(tempdir != NULL){
3332
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
}
3333
2659
}
3334
2660
3335
2661
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0