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- Committer: Teddy Hogeborn
- Date: 2009-09-22 20:18:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20090922201843-cd5uqnthf3eegg4l
* mandos (Client.start_checker): Bug fix: Fix race condition with
short intervals.
short intervals.
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
47
srand(), strtof(), abort() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
65
#include <errno.h> /* perror(), errno */
62
66
#include <time.h> /* nanosleep(), time() */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
78
86
#ifdef __linux__
79
87
#include <sys/klog.h> /* klogctl() */
80
#endif
88
#endif /* __linux__ */
81
89
82
90
/* Avahi */
83
91
/* All Avahi types, constants and functions
129
137
gpgme_ctx_t ctx;
130
138
} mandos_context;
131
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
147
132
148
/*
133
* Make additional room in "buffer" for at least BUFFER_SIZE
134
* additional bytes. "buffer_capacity" is how much is currently
135
* allocated, "buffer_length" is how much is already used.
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
151
* "buffer_length" is how much is already used.
136
152
*/
137
153
size_t incbuffer(char **buffer, size_t buffer_length,
138
154
size_t buffer_capacity){
149
165
/*
150
166
* Initialize GPGME.
151
167
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
168
static bool init_gpgme(const char *seckey,
153
169
const char *pubkey, const char *tempdir){
154
int ret;
155
170
gpgme_error_t rc;
156
171
gpgme_engine_info_t engine_info;
157
172
160
175
* Helper function to insert pub and seckey to the engine keyring.
161
176
*/
162
177
bool import_key(const char *filename){
178
int ret;
163
179
int fd;
164
180
gpgme_data_t pgp_data;
165
181
176
192
return false;
177
193
}
178
194
179
rc = gpgme_op_import(mc->ctx, pgp_data);
195
rc = gpgme_op_import(mc.ctx, pgp_data);
180
196
if(rc != GPG_ERR_NO_ERROR){
181
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
198
gpgme_strsource(rc), gpgme_strerror(rc));
192
208
}
193
209
194
210
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
211
fprintf(stderr, "Initializing GPGME\n");
196
212
}
197
213
198
214
/* Init GPGME */
225
241
}
226
242
227
243
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
244
rc = gpgme_new(&(mc.ctx));
229
245
if(rc != GPG_ERR_NO_ERROR){
230
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
247
gpgme_strsource(rc), gpgme_strerror(rc));
236
252
return false;
237
253
}
238
254
239
return true;
255
return true;
240
256
}
241
257
242
258
/*
243
259
* Decrypt OpenPGP data.
244
260
* Returns -1 on error
245
261
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
263
size_t crypto_size,
249
264
char **plaintext){
250
265
gpgme_data_t dh_crypto, dh_plain;
277
292
278
293
/* Decrypt data from the cryptotext data buffer to the plaintext
279
294
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
296
if(rc != GPG_ERR_NO_ERROR){
282
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
298
gpgme_strsource(rc), gpgme_strerror(rc));
284
299
plaintext_length = -1;
285
300
if(debug){
286
301
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
302
result = gpgme_op_decrypt_result(mc.ctx);
288
303
if(result == NULL){
289
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
305
} else {
297
312
}
298
313
gpgme_recipient_t recipient;
299
314
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
315
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
322
recipient = recipient->next;
310
323
}
311
324
}
312
325
}
382
395
fprintf(stderr, "GnuTLS: %s", string);
383
396
}
384
397
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
398
static int init_gnutls_global(const char *pubkeyfilename,
387
399
const char *seckeyfilename){
388
400
int ret;
389
401
407
419
}
408
420
409
421
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
411
423
if(ret != GNUTLS_E_SUCCESS){
412
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
425
from
425
437
}
426
438
427
439
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
429
441
GNUTLS_OPENPGP_FMT_BASE64);
430
442
if(ret != GNUTLS_E_SUCCESS){
431
443
fprintf(stderr,
437
449
}
438
450
439
451
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
452
ret = gnutls_dh_params_init(&mc.dh_params);
441
453
if(ret != GNUTLS_E_SUCCESS){
442
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
455
" %s\n", safer_gnutls_strerror(ret));
444
456
goto globalfail;
445
457
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
459
if(ret != GNUTLS_E_SUCCESS){
448
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
461
safer_gnutls_strerror(ret));
450
462
goto globalfail;
451
463
}
452
464
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
466
455
467
return 0;
456
468
457
469
globalfail:
458
470
459
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
460
472
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
462
474
return -1;
463
475
}
464
476
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
477
static int init_gnutls_session(gnutls_session_t *session){
467
478
int ret;
468
479
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
480
do {
481
ret = gnutls_init(session, GNUTLS_SERVER);
482
if(quit_now){
483
return -1;
484
}
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
486
if(ret != GNUTLS_E_SUCCESS){
471
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
488
safer_gnutls_strerror(ret));
474
490
475
491
{
476
492
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
493
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
495
if(quit_now){
496
gnutls_deinit(*session);
497
return -1;
498
}
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
500
if(ret != GNUTLS_E_SUCCESS){
479
501
fprintf(stderr, "Syntax error at: %s\n", err);
480
502
fprintf(stderr, "GnuTLS error: %s\n",
484
506
}
485
507
}
486
508
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
509
do {
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
512
if(quit_now){
513
gnutls_deinit(*session);
514
return -1;
515
}
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
517
if(ret != GNUTLS_E_SUCCESS){
490
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
519
safer_gnutls_strerror(ret));
494
522
}
495
523
496
524
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
526
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
528
502
529
return 0;
503
530
}
509
536
/* Called when a Mandos server is found */
510
537
static int start_mandos_communication(const char *ip, uint16_t port,
511
538
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
539
int af){
540
int ret, tcp_sd = -1;
514
541
ssize_t sret;
515
542
union {
516
543
struct sockaddr_in in;
517
544
struct sockaddr_in6 in6;
518
545
} to;
519
546
char *buffer = NULL;
520
char *decrypted_buffer;
547
char *decrypted_buffer = NULL;
521
548
size_t buffer_length = 0;
522
549
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
524
550
size_t written;
525
int retval = 0;
551
int retval = -1;
526
552
gnutls_session_t session;
527
553
int pf; /* Protocol family */
528
554
555
if(quit_now){
556
return -1;
557
}
558
529
559
switch(af){
530
560
case AF_INET6:
531
561
pf = PF_INET6;
538
568
return -1;
539
569
}
540
570
541
ret = init_gnutls_session(mc, &session);
571
ret = init_gnutls_session(&session);
542
572
if(ret != 0){
543
573
return -1;
544
574
}
551
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
582
if(tcp_sd < 0){
553
583
perror("socket");
554
return -1;
584
goto mandos_end;
585
}
586
587
if(quit_now){
588
goto mandos_end;
555
589
}
556
590
557
591
memset(&to, 0, sizeof(to));
558
592
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
593
to.in6.sin6_family = (sa_family_t)af;
560
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
595
} else { /* IPv4 */
562
596
to.in.sin_family = (sa_family_t)af;
564
598
}
565
599
if(ret < 0 ){
566
600
perror("inet_pton");
567
return -1;
601
goto mandos_end;
568
602
}
569
603
if(ret == 0){
570
604
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
605
goto mandos_end;
572
606
}
573
607
if(af == AF_INET6){
574
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
615
if(if_index == AVAHI_IF_UNSPEC){
582
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
617
" without a network interface\n");
584
return -1;
618
goto mandos_end;
585
619
}
586
620
/* Set the network interface number as scope */
587
621
to.in6.sin6_scope_id = (uint32_t)if_index;
592
626
-Wunreachable-code */
593
627
}
594
628
629
if(quit_now){
630
goto mandos_end;
631
}
632
595
633
if(debug){
596
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
635
char interface[IF_NAMESIZE];
624
662
}
625
663
}
626
664
665
if(quit_now){
666
goto mandos_end;
667
}
668
627
669
if(af == AF_INET6){
628
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
671
} else {
631
673
}
632
674
if(ret < 0){
633
675
perror("connect");
634
return -1;
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
635
681
}
636
682
637
683
const char *out = mandos_protocol_version;
642
688
out_size - written));
643
689
if(ret == -1){
644
690
perror("write");
645
retval = -1;
646
691
goto mandos_end;
647
692
}
648
693
written += (size_t)ret;
656
701
break;
657
702
}
658
703
}
704
705
if(quit_now){
706
goto mandos_end;
707
}
659
708
}
660
709
661
710
if(debug){
662
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
712
}
664
713
714
if(quit_now){
715
goto mandos_end;
716
}
717
665
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
719
667
do{
720
if(quit_now){
721
goto mandos_end;
722
}
723
724
do {
668
725
ret = gnutls_handshake(session);
726
if(quit_now){
727
goto mandos_end;
728
}
669
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
730
671
731
if(ret != GNUTLS_E_SUCCESS){
673
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
674
734
gnutls_perror(ret);
675
735
}
676
retval = -1;
677
736
goto mandos_end;
678
737
}
679
738
685
744
}
686
745
687
746
while(true){
747
748
if(quit_now){
749
goto mandos_end;
750
}
751
688
752
buffer_capacity = incbuffer(&buffer, buffer_length,
689
753
buffer_capacity);
690
754
if(buffer_capacity == 0){
691
755
perror("incbuffer");
692
retval = -1;
756
goto mandos_end;
757
}
758
759
if(quit_now){
693
760
goto mandos_end;
694
761
}
695
762
704
771
case GNUTLS_E_AGAIN:
705
772
break;
706
773
case GNUTLS_E_REHANDSHAKE:
707
do{
774
do {
708
775
ret = gnutls_handshake(session);
776
777
if(quit_now){
778
goto mandos_end;
779
}
709
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
781
if(ret < 0){
711
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
712
783
gnutls_perror(ret);
713
retval = -1;
714
784
goto mandos_end;
715
785
}
716
786
break;
717
787
default:
718
788
fprintf(stderr, "Unknown error while reading data from"
719
789
" encrypted session with Mandos server\n");
720
retval = -1;
721
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
722
791
goto mandos_end;
723
792
}
730
799
fprintf(stderr, "Closing TLS session\n");
731
800
}
732
801
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
do {
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
if(quit_now){
809
goto mandos_end;
810
}
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
812
735
813
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
814
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
816
buffer_length,
738
817
&decrypted_buffer);
739
818
if(decrypted_buffer_size >= 0){
819
740
820
written = 0;
741
821
while(written < (size_t) decrypted_buffer_size){
822
if(quit_now){
823
goto mandos_end;
824
}
825
742
826
ret = (int)fwrite(decrypted_buffer + written, 1,
743
827
(size_t)decrypted_buffer_size - written,
744
828
stdout);
747
831
fprintf(stderr, "Error writing encrypted data: %s\n",
748
832
strerror(errno));
749
833
}
750
retval = -1;
751
break;
834
goto mandos_end;
752
835
}
753
836
written += (size_t)ret;
754
837
}
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
838
retval = 0;
758
839
}
759
} else {
760
retval = -1;
761
840
}
762
841
763
842
/* Shutdown procedure */
764
843
765
844
mandos_end:
845
free(decrypted_buffer);
766
846
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
768
850
if(ret == -1){
769
851
perror("close");
770
852
}
771
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
856
}
772
857
return retval;
773
858
}
774
859
785
870
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
871
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
872
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
873
AVAHI_GCC_UNUSED void* userdata){
790
874
assert(r);
791
875
792
876
/* Called whenever a service has been resolved successfully or
793
877
timed out */
794
878
879
if(quit_now){
880
return;
881
}
882
795
883
switch(event){
796
884
default:
797
885
case AVAHI_RESOLVER_FAILURE:
798
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
888
avahi_strerror(avahi_server_errno(mc.server)));
801
889
break;
802
890
803
891
case AVAHI_RESOLVER_FOUND:
809
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
898
ip, (intmax_t)interface, port);
811
899
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
900
int ret = start_mandos_communication(ip, port, interface,
813
901
avahi_proto_to_af(proto));
814
902
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
903
avahi_simple_poll_quit(mc.simple_poll);
816
904
}
817
905
}
818
906
}
828
916
const char *domain,
829
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
918
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
919
AVAHI_GCC_UNUSED void* userdata){
833
920
assert(b);
834
921
835
922
/* Called whenever a new services becomes available on the LAN or
836
923
is removed from the LAN */
837
924
925
if(quit_now){
926
return;
927
}
928
838
929
switch(event){
839
930
default:
840
931
case AVAHI_BROWSER_FAILURE:
841
932
842
933
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
845
936
return;
846
937
847
938
case AVAHI_BROWSER_NEW:
850
941
the callback function is called the Avahi server will free the
851
942
resolver for us. */
852
943
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
857
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
948
name, avahi_strerror(avahi_server_errno(mc.server)));
859
949
break;
860
950
861
951
case AVAHI_BROWSER_REMOVE:
870
960
}
871
961
}
872
962
963
/* stop main loop after sigterm has been called */
964
static void handle_sigterm(int sig){
965
if(quit_now){
966
return;
967
}
968
quit_now = 1;
969
signal_received = sig;
970
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
975
}
976
873
977
int main(int argc, char *argv[]){
874
978
AvahiSServiceBrowser *sb = NULL;
875
979
int error;
876
980
int ret;
877
981
intmax_t tmpmax;
878
int numchars;
982
char *tmp;
879
983
int exitcode = EXIT_SUCCESS;
880
984
const char *interface = "eth0";
881
985
struct ifreq network;
882
int sd;
986
int sd = -1;
987
bool take_down_interface = false;
883
988
uid_t uid;
884
989
gid_t gid;
885
990
char *connect_to = NULL;
889
994
const char *seckey = PATHDIR "/" SECKEY;
890
995
const char *pubkey = PATHDIR "/" PUBKEY;
891
996
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
997
bool gnutls_initialized = false;
896
998
bool gpgme_initialized = false;
897
double delay = 2.5;
999
float delay = 2.5f;
1000
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1003
1004
uid = getuid();
1005
gid = getgid();
1006
1007
/* Lower any group privileges we might have, just to be safe */
1008
errno = 0;
1009
ret = setgid(gid);
1010
if(ret == -1){
1011
perror("setgid");
1012
}
1013
1014
/* Lower user privileges (temporarily) */
1015
errno = 0;
1016
ret = seteuid(uid);
1017
if(ret == -1){
1018
perror("seteuid");
1019
}
1020
1021
if(quit_now){
1022
goto end;
1023
}
898
1024
899
1025
{
900
1026
struct argp_option options[] = {
952
1078
pubkey = arg;
953
1079
break;
954
1080
case 129: /* --dh-bits */
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
1081
errno = 0;
1082
tmpmax = strtoimax(arg, &tmp, 10);
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
958
1085
fprintf(stderr, "Bad number of DH bits\n");
959
1086
exit(EXIT_FAILURE);
960
1087
}
964
1091
mc.priority = arg;
965
1092
break;
966
1093
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
1094
errno = 0;
1095
delay = strtof(arg, &tmp);
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
969
1097
fprintf(stderr, "Bad delay\n");
970
1098
exit(EXIT_FAILURE);
971
1099
}
992
1120
}
993
1121
}
994
1122
1123
if(not debug){
1124
avahi_set_log_function(empty_log);
1125
}
1126
1127
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1128
from the signal handler */
1129
/* Initialize the pseudo-RNG for Avahi */
1130
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1137
1138
sigemptyset(&sigterm_action.sa_mask);
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
1143
goto end;
1144
}
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
1149
goto end;
1150
}
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
/* Need to check if the handler is SIG_IGN before handling:
1158
| [[info:libc:Initial Signal Actions]] |
1159
| [[info:libc:Basic Signal Handling]] |
1160
*/
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
1165
}
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
}
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
1178
}
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
1184
goto end;
1185
}
1186
}
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
1191
}
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
995
1201
/* If the interface is down, bring it up */
996
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
997
1221
#ifdef __linux__
998
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
1223
messages to mess up the prompt */
1003
1227
restore_loglevel = false;
1004
1228
perror("klogctl");
1005
1229
}
1006
#endif
1230
#endif /* __linux__ */
1007
1231
1008
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
1233
if(sd < 0){
1016
1240
perror("klogctl");
1017
1241
}
1018
1242
}
1019
#endif
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1020
1250
goto end;
1021
1251
}
1022
1252
strcpy(network.ifr_name, interface);
1030
1260
perror("klogctl");
1031
1261
}
1032
1262
}
1033
#endif
1263
#endif /* __linux__ */
1034
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1035
1271
goto end;
1036
1272
}
1037
1273
if((network.ifr_flags & IFF_UP) == 0){
1038
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1039
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
1277
if(ret == -1){
1278
take_down_interface = false;
1041
1279
perror("ioctl SIOCSIFFLAGS");
1042
1280
exitcode = EXIT_FAILURE;
1043
1281
#ifdef __linux__
1047
1285
perror("klogctl");
1048
1286
}
1049
1287
}
1050
#endif
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1051
1295
goto end;
1052
1296
}
1053
1297
}
1065
1309
perror("nanosleep");
1066
1310
}
1067
1311
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1071
1318
}
1072
1319
#ifdef __linux__
1073
1320
if(restore_loglevel){
1077
1324
perror("klogctl");
1078
1325
}
1079
1326
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
1343
}
1344
1345
if(quit_now){
1346
goto end;
1347
}
1348
1349
ret = init_gnutls_global(pubkey, seckey);
1098
1350
if(ret == -1){
1099
1351
fprintf(stderr, "init_gnutls_global failed\n");
1100
1352
exitcode = EXIT_FAILURE;
1103
1355
gnutls_initialized = true;
1104
1356
}
1105
1357
1358
if(quit_now){
1359
goto end;
1360
}
1361
1362
tempdir_created = true;
1106
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1107
1365
perror("mkdtemp");
1108
1366
goto end;
1109
1367
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1368
1369
if(quit_now){
1370
goto end;
1371
}
1372
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1113
1374
fprintf(stderr, "init_gpgme failed\n");
1114
1375
exitcode = EXIT_FAILURE;
1115
1376
goto end;
1117
1378
gpgme_initialized = true;
1118
1379
}
1119
1380
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1381
if(quit_now){
1382
goto end;
1127
1383
}
1128
1384
1129
1385
if(connect_to != NULL){
1135
1391
exitcode = EXIT_FAILURE;
1136
1392
goto end;
1137
1393
}
1394
1395
if(quit_now){
1396
goto end;
1397
}
1398
1138
1399
uint16_t port;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1400
errno = 0;
1401
tmpmax = strtoimax(address+1, &tmp, 10);
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1142
1404
fprintf(stderr, "Bad port number\n");
1143
1405
exitcode = EXIT_FAILURE;
1144
1406
goto end;
1145
1407
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1146
1413
port = (uint16_t)tmpmax;
1147
1414
*address = '\0';
1148
1415
address = connect_to;
1153
1420
} else {
1154
1421
af = AF_INET;
1155
1422
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1423
1424
if(quit_now){
1425
goto end;
1426
}
1427
1428
ret = start_mandos_communication(address, port, if_index, af);
1158
1429
if(ret < 0){
1159
1430
exitcode = EXIT_FAILURE;
1160
1431
} else {
1163
1434
goto end;
1164
1435
}
1165
1436
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
1437
if(quit_now){
1178
1438
goto end;
1179
1439
}
1180
1440
1204
1464
goto end;
1205
1465
}
1206
1466
1467
if(quit_now){
1468
goto end;
1469
}
1470
1207
1471
/* Create the Avahi service browser */
1208
1472
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
1211
1475
if(sb == NULL){
1212
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1213
1477
avahi_strerror(avahi_server_errno(mc.server)));
1215
1479
goto end;
1216
1480
}
1217
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1218
1486
/* Run the main loop */
1219
1487
1220
1488
if(debug){
1249
1517
gpgme_release(mc.ctx);
1250
1518
}
1251
1519
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1252
1552
/* Removes the temp directory used by GPGME */
1253
1553
if(tempdir_created){
1254
1554
DIR *d;
1293
1593
}
1294
1594
}
1295
1595
1596
if(quit_now){
1597
sigemptyset(&old_sigterm_action.sa_mask);
1598
old_sigterm_action.sa_handler = SIG_DFL;
1599
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1600
&old_sigterm_action,
1601
NULL));
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
do {
1606
ret = raise(signal_received);
1607
} while(ret != 0 and errno == EINTR);
1608
if(ret != 0){
1609
perror("raise");
1610
abort();
1611
}
1612
TEMP_FAILURE_RETRY(pause());
1613
}
1614
1296
1615
return exitcode;
1297
1616
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0