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237.7.308
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-07-06 21:02:27 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150706210227-4wz9tazr6bte3js1
debian/control (Build-Depends): Bug fix: Added "libnl-route-3-dev".
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- files modified:
- DBUS-API
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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open(), unlinkat() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
123
117
gnutls_*
124
118
init_gnutls_session(),
125
119
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
120
#include <gnutls/openpgp.h>
128
121
/* gnutls_certificate_set_openpgp_key_file(),
129
122
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
135
123
136
124
/* GPGME */
137
125
#include <gpgme.h> /* All GPGME types, constants and
145
133
#define PATHDIR "/conf/conf.d/mandos"
146
134
#define SECKEY "seckey.txt"
147
135
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
137
152
138
bool debug = false;
280
266
return true;
281
267
}
282
268
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
269
/*
336
270
* Initialize GPGME.
337
271
*/
357
291
return false;
358
292
}
359
293
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
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
295
if(rc != GPG_ERR_NO_ERROR){
412
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
420
304
gpgme_strsource(rc), gpgme_strerror(rc));
421
305
return false;
422
306
}
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
307
499
ret = close(fd);
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
309
if(ret == -1){
501
310
perror_plus("close");
502
311
}
541
350
/* Create new GPGME "context" */
542
351
rc = gpgme_new(&(mc->ctx));
543
352
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
546
356
return false;
547
357
}
548
358
584
394
/* Create new empty GPGME data buffer for the plaintext */
585
395
rc = gpgme_data_new(&dh_plain);
586
396
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
588
399
gpgme_strsource(rc), gpgme_strerror(rc));
589
400
gpgme_data_release(dh_crypto);
590
401
return -1;
603
414
if(result == NULL){
604
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
416
} 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");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
612
421
if(result->file_name != NULL){
613
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
423
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
426
while(recipient != NULL){
618
427
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);
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
431
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
623
435
}
624
436
}
625
437
}
701
513
fprintf_plus(stderr, "GnuTLS: %s", string);
702
514
}
703
515
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
516
__attribute__((nonnull, warn_unused_result))
705
517
static int init_gnutls_global(const char *pubkeyfilename,
706
518
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
519
mandos_context *mc){
709
520
int ret;
521
unsigned int uret;
710
522
711
523
if(debug){
712
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
525
}
714
526
527
ret = gnutls_global_init();
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
531
return -1;
532
}
533
715
534
if(debug){
716
535
/* "Use a log level over 10 to enable all debugging options."
717
536
* - GnuTLS manual
725
544
if(ret != GNUTLS_E_SUCCESS){
726
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
728
548
return -1;
729
549
}
730
550
731
551
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
734
554
pubkeyfilename,
735
555
seckeyfilename);
736
556
}
737
557
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
558
ret = gnutls_certificate_set_openpgp_key_file
752
559
(mc->cred, pubkeyfilename, seckeyfilename,
753
560
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
561
if(ret != GNUTLS_E_SUCCESS){
758
562
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
566
safer_gnutls_strerror(ret));
771
575
safer_gnutls_strerror(ret));
772
576
goto globalfail;
773
577
}
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;
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
785
585
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
790
590
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
591
free(buffer.data);
592
buffer.data = NULL;
794
593
break;
795
594
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
798
596
BUFFER_SIZE);
799
597
/* EOF */
800
598
if(bytes_read == 0){
803
601
/* check bytes_read for failure */
804
602
if(bytes_read < 0){
805
603
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);
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
881
627
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
884
629
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
}
630
privkey = NULL;
909
631
}
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)));
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
919
644
}
920
645
}
921
646
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
925
650
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
928
653
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
654
(sec_param)));
931
655
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
935
664
safe_string(gnutls_sec_param_get_name
936
665
(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
666
mc->dh_bits);
945
667
}
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);
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
954
674
}
955
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
683
goto globalfail;
684
}
685
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
956
687
957
688
return 0;
958
689
959
690
globalfail:
960
691
961
692
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
962
694
gnutls_dh_params_deinit(mc->dh_params);
963
695
return -1;
964
696
}
969
701
int ret;
970
702
/* GnuTLS session creation */
971
703
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
));
704
ret = gnutls_init(session, GNUTLS_SERVER);
980
705
if(quit_now){
981
706
return -1;
982
707
}
1023
748
/* ignore client certificate if any. */
1024
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
750
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
752
1026
753
return 0;
1027
754
}
1028
755
1030
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
758
__attribute__((unused)) const char *txt){}
1032
759
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
766
ret_errno = errno;
767
}
768
errno = old_errno;
769
return ret_errno;
770
}
771
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
778
errno = old_errno;
779
return ret_errno;
780
}
781
if(setuid(0) == -1){
782
ret_errno = errno;
783
}
784
errno = old_errno;
785
return ret_errno;
786
}
787
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
794
ret_errno = errno;
795
}
796
errno = old_errno;
797
return ret_errno;
798
}
799
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
806
ret_errno = errno;
807
}
808
errno = old_errno;
809
return ret_errno;
810
}
811
1033
812
/* Helper function to add_local_route() and delete_local_route() */
1034
813
__attribute__((nonnull, warn_unused_result))
1035
814
static bool add_delete_local_route(const bool add,
1089
868
perror_plus("dup2(devnull, STDIN_FILENO)");
1090
869
_exit(EX_OSERR);
1091
870
}
1092
ret = close(devnull);
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1093
872
if(ret == -1){
1094
873
perror_plus("close");
1095
874
_exit(EX_OSERR);
1112
891
helper, O_RDONLY));
1113
892
if(helper_fd == -1){
1114
893
perror_plus("openat");
1115
close(helperdir_fd);
1116
894
_exit(EX_UNAVAILABLE);
1117
895
}
1118
close(helperdir_fd);
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
1119
897
#ifdef __GNUC__
1120
898
#pragma GCC diagnostic push
1121
899
#pragma GCC diagnostic ignored "-Wcast-qual"
1240
1018
bool match = false;
1241
1019
{
1242
1020
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1246
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1247
1024
match = true;
1248
1025
break;
1290
1067
goto mandos_end;
1291
1068
}
1292
1069
1070
memset(&to, 0, sizeof(to));
1293
1071
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);
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1297
1074
} 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);
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1301
1077
}
1302
1078
if(ret < 0 ){
1303
1079
int e = errno;
1382
1158
sizeof(struct sockaddr_in));
1383
1159
}
1384
1160
if(ret < 0){
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1161
if(errno == ENETUNREACH
1386
1162
and if_index != AVAHI_IF_UNSPEC
1387
1163
and connect_to == NULL
1388
1164
and not route_added and
1401
1177
with an explicit route added with the server's address.
1402
1178
1403
1179
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
1181
https://bugs.debian.org/587961
1406
1182
*/
1407
1183
if(debug){
1587
1363
&decrypted_buffer, mc);
1588
1364
if(decrypted_buffer_size >= 0){
1589
1365
1590
clearerr(stdout);
1591
1366
written = 0;
1592
1367
while(written < (size_t) decrypted_buffer_size){
1593
1368
if(quit_now){
1609
1384
}
1610
1385
written += (size_t)ret;
1611
1386
}
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
1387
retval = 0;
1623
1388
}
1624
1389
}
1637
1402
free(decrypted_buffer);
1638
1403
free(buffer);
1639
1404
if(tcp_sd >= 0){
1640
ret = close(tcp_sd);
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1641
1406
}
1642
1407
if(ret == -1){
1643
1408
if(e == 0){
1655
1420
return retval;
1656
1421
}
1657
1422
1423
__attribute__((nonnull))
1658
1424
static void resolve_callback(AvahiSServiceResolver *r,
1659
1425
AvahiIfIndex interface,
1660
1426
AvahiProtocol proto,
1797
1563
__attribute__((nonnull, warn_unused_result))
1798
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
1565
int ret;
1800
int old_errno;
1566
error_t ret_errno;
1801
1567
1802
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
1569
if(s < 0){
1804
old_errno = errno;
1570
ret_errno = errno;
1805
1571
perror_plus("socket");
1806
errno = old_errno;
1572
errno = ret_errno;
1807
1573
return false;
1808
1574
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1575
strcpy(ifr->ifr_name, ifname);
1811
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
1577
if(ret == -1){
1813
1578
if(debug){
1814
old_errno = errno;
1579
ret_errno = errno;
1815
1580
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;
1581
errno = ret_errno;
1822
1582
}
1823
1583
return false;
1824
1584
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
1585
return true;
1831
1586
}
1832
1587
2093
1848
return;
2094
1849
}
2095
1850
}
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
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
2101
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
2103
1863
if(numhooks == -1){
2104
1864
perror_plus("scandir");
2105
close(devnull);
2106
1865
return;
2107
1866
}
2108
1867
struct dirent *direntry;
2109
1868
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
2110
1874
for(int i = 0; i < numhooks; i++){
2111
1875
direntry = direntries[i];
2112
1876
if(debug){
2183
1947
perror_plus("openat");
2184
1948
_exit(EXIT_FAILURE);
2185
1949
}
2186
if(close(hookdir_fd) == -1){
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2187
1951
perror_plus("close");
2188
1952
_exit(EXIT_FAILURE);
2189
1953
}
2192
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
2193
1957
_exit(EX_OSERR);
2194
1958
}
2195
ret = close(devnull);
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2196
1960
if(ret == -1){
2197
1961
perror_plus("close");
2198
1962
_exit(EX_OSERR);
2247
2011
free(direntry);
2248
2012
}
2249
2013
free(direntries);
2250
if(close(hookdir_fd) == -1){
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2251
2015
perror_plus("close");
2252
2016
} else {
2253
2017
hookdir_fd = -1;
2256
2020
}
2257
2021
2258
2022
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2262
2026
int ret;
2263
2027
struct ifreq network;
2264
2028
unsigned int if_index = if_nametoindex(interface);
2274
2038
}
2275
2039
2276
2040
if(not interface_is_up(interface)){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2041
error_t ret_errno = 0, ioctl_errno = 0;
2279
2042
if(not get_flags(interface, &network)){
2280
2043
ret_errno = errno;
2281
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2294
2057
}
2295
2058
2296
2059
if(quit_now){
2297
ret = close(sd);
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2298
2061
if(ret == -1){
2299
2062
perror_plus("close");
2300
2063
}
2350
2113
}
2351
2114
2352
2115
/* Close the socket */
2353
ret = close(sd);
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2354
2117
if(ret == -1){
2355
2118
perror_plus("close");
2356
2119
}
2368
2131
2369
2132
/* Sleep checking until interface is running.
2370
2133
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
2134
for(int i=0; i < delay * 4; i++){
2372
2135
if(interface_is_running(interface)){
2373
2136
break;
2374
2137
}
2384
2147
}
2385
2148
2386
2149
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2389
2152
struct ifreq network;
2390
2153
unsigned int if_index = if_nametoindex(interface);
2391
2154
if(if_index == 0){
2394
2157
return ENXIO;
2395
2158
}
2396
2159
if(interface_is_up(interface)){
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
2160
error_t ret_errno = 0, ioctl_errno = 0;
2399
2161
if(not get_flags(interface, &network) and debug){
2400
2162
ret_errno = errno;
2401
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2439
2201
}
2440
2202
2441
2203
/* Close the socket */
2442
int ret = close(sd);
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2443
2205
if(ret == -1){
2444
2206
perror_plus("close");
2445
2207
}
2461
2223
2462
2224
int main(int argc, char *argv[]){
2463
2225
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 };
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2476
2229
AvahiSServiceBrowser *sb = NULL;
2477
2230
error_t ret_errno;
2478
2231
int ret;
2487
2240
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
2241
const char *seckey = PATHDIR "/" SECKEY;
2489
2242
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
2243
char *interfaces_hooks = NULL;
2496
2244
2497
2245
bool gnutls_initialized = false;
2544
2292
{ .name = "pubkey", .key = 'p',
2545
2293
.arg = "FILE",
2546
2294
.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 },
2295
.group = 2 },
2564
2296
{ .name = "dh-bits", .key = 129,
2565
2297
.arg = "BITS",
2566
2298
.doc = "Bit length of the prime number used in the"
2567
2299
" Diffie-Hellman key exchange",
2568
2300
.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
2301
{ .name = "priority", .key = 130,
2575
2302
.arg = "STRING",
2576
2303
.doc = "GnuTLS priority string for the TLS handshake",
2622
2349
case 'p': /* --pubkey */
2623
2350
pubkey = arg;
2624
2351
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
2352
case 129: /* --dh-bits */
2636
2353
errno = 0;
2637
2354
tmpmax = strtoimax(arg, &tmp, 10);
2641
2358
}
2642
2359
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2643
2360
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2647
2361
case 130: /* --priority */
2648
2362
mc.priority = arg;
2649
2363
break;
2672
2386
argp_state_help(state, state->out_stream,
2673
2387
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
2388
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2676
2389
case -3: /* --usage */
2677
2390
argp_state_help(state, state->out_stream,
2678
2391
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2680
2392
case 'V': /* --version */
2681
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2682
2394
exit(argp_err_exit_status);
2691
2403
.args_doc = "",
2692
2404
.doc = "Mandos client -- Get and decrypt"
2693
2405
" 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){
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2408
switch(ret){
2697
2409
case 0:
2698
2410
break;
2699
2411
case ENOMEM:
2700
2412
default:
2701
errno = ret_errno;
2413
errno = ret;
2702
2414
perror_plus("argp_parse");
2703
2415
exitcode = EX_OSERR;
2704
2416
goto end;
2710
2422
2711
2423
{
2712
2424
/* Work around Debian bug #633582:
2713
<https://bugs.debian.org/633582> */
2425
<http://bugs.debian.org/633582> */
2714
2426
2715
2427
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2719
2431
perror_plus("Failed to raise privileges");
2720
2432
} else {
2721
2433
struct stat st;
2737
2449
}
2738
2450
}
2739
2451
}
2740
close(seckey_fd);
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2741
2453
}
2742
2454
}
2743
2455
2758
2470
}
2759
2471
}
2760
2472
}
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);
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2784
2474
}
2785
2475
}
2786
2476
2787
2477
/* Lower privileges */
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2791
2481
perror_plus("Failed to lower privileges");
2792
2482
}
2793
2483
}
2963
2653
errno = bring_up_interface(interface, delay);
2964
2654
if(not interface_was_up){
2965
2655
if(errno != 0){
2966
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2967
" %s\n", interface, strerror(errno));
2656
perror_plus("Failed to bring up interface");
2968
2657
} else {
2969
2658
errno = argz_add(&interfaces_to_take_down,
2970
2659
&interfaces_to_take_down_size,
2993
2682
goto end;
2994
2683
}
2995
2684
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
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
3003
2686
if(ret == -1){
3004
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
3005
2688
exitcode = EX_UNAVAILABLE;
3127
2810
3128
2811
/* Allocate a new server */
3129
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3130
&config, NULL, NULL, &ret);
2813
&config, NULL, NULL, &ret_errno);
3131
2814
3132
2815
/* Free the Avahi configuration data */
3133
2816
avahi_server_config_free(&config);
3136
2819
/* Check if creating the Avahi server object succeeded */
3137
2820
if(mc.server == NULL){
3138
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3139
avahi_strerror(ret));
2822
avahi_strerror(ret_errno));
3140
2823
exitcode = EX_UNAVAILABLE;
3141
2824
goto end;
3142
2825
}
3177
2860
end:
3178
2861
3179
2862
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
}
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
2864
}
3188
2865
3189
2866
/* Cleanup things */
3200
2877
3201
2878
if(gnutls_initialized){
3202
2879
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
3203
2881
gnutls_dh_params_deinit(mc.dh_params);
3204
2882
}
3205
2883
3228
2906
3229
2907
/* Re-raise privileges */
3230
2908
{
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
3234
2912
perror_plus("Failed to raise privileges");
3235
2913
} else {
3236
2914
3241
2919
/* Take down the network interfaces which were brought up */
3242
2920
{
3243
2921
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;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
3250
2928
perror_plus("Failed to take down interface");
3251
2929
}
3252
2930
}
3257
2935
}
3258
2936
}
3259
2937
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
3263
2941
perror_plus("Failed to lower privileges permanently");
3264
2942
}
3265
2943
}
3267
2945
free(interfaces_to_take_down);
3268
2946
free(interfaces_hooks);
3269
2947
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
2948
/* Removes the GPGME temp directory and all files inside */
3325
2949
if(tempdir != NULL){
3326
clean_dir_at(-1, tempdir, 0);
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2990
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2992
}
3327
2993
}
3328
2994
3329
2995
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0