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- Committer: Teddy Hogeborn
- Date: 2009-12-27 03:35:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20091227033558-y57wv1u4cls3i8kq
TODO file changes.
- files added:
- dbus-mandos.conf
- 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
78
88
#ifdef __linux__
79
89
#include <sys/klog.h> /* klogctl() */
80
#endif
90
#endif /* __linux__ */
81
91
82
92
/* Avahi */
83
93
/* All Avahi types, constants and functions
129
139
gpgme_ctx_t ctx;
130
140
} mandos_context;
131
141
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
132
150
/*
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.
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
153
* "buffer_length" is how much is already used.
136
154
*/
137
155
size_t incbuffer(char **buffer, size_t buffer_length,
138
156
size_t buffer_capacity){
149
167
/*
150
168
* Initialize GPGME.
151
169
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
170
static bool init_gpgme(const char *seckey,
153
171
const char *pubkey, const char *tempdir){
154
int ret;
155
172
gpgme_error_t rc;
156
173
gpgme_engine_info_t engine_info;
157
174
160
177
* Helper function to insert pub and seckey to the engine keyring.
161
178
*/
162
179
bool import_key(const char *filename){
180
int ret;
163
181
int fd;
164
182
gpgme_data_t pgp_data;
165
183
176
194
return false;
177
195
}
178
196
179
rc = gpgme_op_import(mc->ctx, pgp_data);
197
rc = gpgme_op_import(mc.ctx, pgp_data);
180
198
if(rc != GPG_ERR_NO_ERROR){
181
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
200
gpgme_strsource(rc), gpgme_strerror(rc));
192
210
}
193
211
194
212
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
213
fprintf(stderr, "Initializing GPGME\n");
196
214
}
197
215
198
216
/* Init GPGME */
225
243
}
226
244
227
245
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
246
rc = gpgme_new(&(mc.ctx));
229
247
if(rc != GPG_ERR_NO_ERROR){
230
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
249
gpgme_strsource(rc), gpgme_strerror(rc));
236
254
return false;
237
255
}
238
256
239
return true;
257
return true;
240
258
}
241
259
242
260
/*
243
261
* Decrypt OpenPGP data.
244
262
* Returns -1 on error
245
263
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
265
size_t crypto_size,
249
266
char **plaintext){
250
267
gpgme_data_t dh_crypto, dh_plain;
277
294
278
295
/* Decrypt data from the cryptotext data buffer to the plaintext
279
296
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
298
if(rc != GPG_ERR_NO_ERROR){
282
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
300
gpgme_strsource(rc), gpgme_strerror(rc));
284
301
plaintext_length = -1;
285
302
if(debug){
286
303
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
304
result = gpgme_op_decrypt_result(mc.ctx);
288
305
if(result == NULL){
289
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
307
} else {
297
314
}
298
315
gpgme_recipient_t recipient;
299
316
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
}
317
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
324
recipient = recipient->next;
310
325
}
311
326
}
312
327
}
382
397
fprintf(stderr, "GnuTLS: %s", string);
383
398
}
384
399
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
400
static int init_gnutls_global(const char *pubkeyfilename,
387
401
const char *seckeyfilename){
388
402
int ret;
389
403
407
421
}
408
422
409
423
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
411
425
if(ret != GNUTLS_E_SUCCESS){
412
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
427
from
425
439
}
426
440
427
441
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
429
443
GNUTLS_OPENPGP_FMT_BASE64);
430
444
if(ret != GNUTLS_E_SUCCESS){
431
445
fprintf(stderr,
437
451
}
438
452
439
453
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
454
ret = gnutls_dh_params_init(&mc.dh_params);
441
455
if(ret != GNUTLS_E_SUCCESS){
442
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
457
" %s\n", safer_gnutls_strerror(ret));
444
458
goto globalfail;
445
459
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
461
if(ret != GNUTLS_E_SUCCESS){
448
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
463
safer_gnutls_strerror(ret));
450
464
goto globalfail;
451
465
}
452
466
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
468
455
469
return 0;
456
470
457
471
globalfail:
458
472
459
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
460
474
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_dh_params_deinit(mc.dh_params);
462
476
return -1;
463
477
}
464
478
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
467
480
int ret;
468
481
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
488
if(ret != GNUTLS_E_SUCCESS){
471
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
490
safer_gnutls_strerror(ret));
474
492
475
493
{
476
494
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
502
if(ret != GNUTLS_E_SUCCESS){
479
503
fprintf(stderr, "Syntax error at: %s\n", err);
480
504
fprintf(stderr, "GnuTLS error: %s\n",
484
508
}
485
509
}
486
510
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
519
if(ret != GNUTLS_E_SUCCESS){
490
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
521
safer_gnutls_strerror(ret));
494
524
}
495
525
496
526
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
528
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
530
502
531
return 0;
503
532
}
509
538
/* Called when a Mandos server is found */
510
539
static int start_mandos_communication(const char *ip, uint16_t port,
511
540
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
541
int af){
542
int ret, tcp_sd = -1;
514
543
ssize_t sret;
515
544
union {
516
545
struct sockaddr_in in;
517
546
struct sockaddr_in6 in6;
518
547
} to;
519
548
char *buffer = NULL;
520
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
521
550
size_t buffer_length = 0;
522
551
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
524
552
size_t written;
525
int retval = 0;
553
int retval = -1;
526
554
gnutls_session_t session;
527
555
int pf; /* Protocol family */
528
556
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
529
564
switch(af){
530
565
case AF_INET6:
531
566
pf = PF_INET6;
535
570
break;
536
571
default:
537
572
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
538
574
return -1;
539
575
}
540
576
541
ret = init_gnutls_session(mc, &session);
577
ret = init_gnutls_session(&session);
542
578
if(ret != 0){
543
579
return -1;
544
580
}
550
586
551
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
588
if(tcp_sd < 0){
589
int e = errno;
553
590
perror("socket");
554
return -1;
591
errno = e;
592
goto mandos_end;
593
}
594
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
555
598
}
556
599
557
600
memset(&to, 0, sizeof(to));
558
601
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
602
to.in6.sin6_family = (sa_family_t)af;
560
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
604
} else { /* IPv4 */
562
605
to.in.sin_family = (sa_family_t)af;
563
606
ret = inet_pton(af, ip, &to.in.sin_addr);
564
607
}
565
608
if(ret < 0 ){
609
int e = errno;
566
610
perror("inet_pton");
567
return -1;
611
errno = e;
612
goto mandos_end;
568
613
}
569
614
if(ret == 0){
615
int e = errno;
570
616
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
617
errno = e;
618
goto mandos_end;
572
619
}
573
620
if(af == AF_INET6){
574
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
628
if(if_index == AVAHI_IF_UNSPEC){
582
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
630
" without a network interface\n");
584
return -1;
631
errno = EINVAL;
632
goto mandos_end;
585
633
}
586
634
/* Set the network interface number as scope */
587
635
to.in6.sin6_scope_id = (uint32_t)if_index;
592
640
-Wunreachable-code */
593
641
}
594
642
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
647
595
648
if(debug){
596
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
650
char interface[IF_NAMESIZE];
624
677
}
625
678
}
626
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
627
685
if(af == AF_INET6){
628
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
687
} else {
630
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
689
}
632
690
if(ret < 0){
691
int e = errno;
633
692
perror("connect");
634
return -1;
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
635
700
}
636
701
637
702
const char *out = mandos_protocol_version;
641
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
642
707
out_size - written));
643
708
if(ret == -1){
709
int e = errno;
644
710
perror("write");
645
retval = -1;
711
errno = e;
646
712
goto mandos_end;
647
713
}
648
714
written += (size_t)ret;
656
722
break;
657
723
}
658
724
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
659
730
}
660
731
661
732
if(debug){
662
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
734
}
664
735
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
665
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
742
667
do{
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
668
749
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
669
754
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
755
671
756
if(ret != GNUTLS_E_SUCCESS){
673
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
674
759
gnutls_perror(ret);
675
760
}
676
retval = -1;
761
errno = EPROTO;
677
762
goto mandos_end;
678
763
}
679
764
685
770
}
686
771
687
772
while(true){
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
688
779
buffer_capacity = incbuffer(&buffer, buffer_length,
689
780
buffer_capacity);
690
781
if(buffer_capacity == 0){
782
int e = errno;
691
783
perror("incbuffer");
692
retval = -1;
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
693
790
goto mandos_end;
694
791
}
695
792
704
801
case GNUTLS_E_AGAIN:
705
802
break;
706
803
case GNUTLS_E_REHANDSHAKE:
707
do{
804
do {
708
805
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
709
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
812
if(ret < 0){
711
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
712
814
gnutls_perror(ret);
713
retval = -1;
815
errno = EPROTO;
714
816
goto mandos_end;
715
817
}
716
818
break;
717
819
default:
718
820
fprintf(stderr, "Unknown error while reading data from"
719
821
" encrypted session with Mandos server\n");
720
retval = -1;
721
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
722
824
goto mandos_end;
723
825
}
724
826
} else {
730
832
fprintf(stderr, "Closing TLS session\n");
731
833
}
732
834
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
847
735
848
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
849
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
851
buffer_length,
738
852
&decrypted_buffer);
739
853
if(decrypted_buffer_size >= 0){
854
740
855
written = 0;
741
856
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
742
862
ret = (int)fwrite(decrypted_buffer + written, 1,
743
863
(size_t)decrypted_buffer_size - written,
744
864
stdout);
745
865
if(ret == 0 and ferror(stdout)){
866
int e = errno;
746
867
if(debug){
747
868
fprintf(stderr, "Error writing encrypted data: %s\n",
748
869
strerror(errno));
749
870
}
750
retval = -1;
751
break;
871
errno = e;
872
goto mandos_end;
752
873
}
753
874
written += (size_t)ret;
754
875
}
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
876
retval = 0;
758
877
}
759
} else {
760
retval = -1;
761
878
}
762
879
763
880
/* Shutdown procedure */
764
881
765
882
mandos_end:
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
770
902
}
771
gnutls_deinit(session);
772
903
return retval;
773
904
}
774
905
785
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
918
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
919
AVAHI_GCC_UNUSED void* userdata){
790
920
assert(r);
791
921
792
922
/* Called whenever a service has been resolved successfully or
793
923
timed out */
794
924
925
if(quit_now){
926
return;
927
}
928
795
929
switch(event){
796
930
default:
797
931
case AVAHI_RESOLVER_FAILURE:
798
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
934
avahi_strerror(avahi_server_errno(mc.server)));
801
935
break;
802
936
803
937
case AVAHI_RESOLVER_FOUND:
809
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
944
ip, (intmax_t)interface, port);
811
945
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
946
int ret = start_mandos_communication(ip, port, interface,
813
947
avahi_proto_to_af(proto));
814
948
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
949
avahi_simple_poll_quit(mc.simple_poll);
816
950
}
817
951
}
818
952
}
828
962
const char *domain,
829
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
964
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
965
AVAHI_GCC_UNUSED void* userdata){
833
966
assert(b);
834
967
835
968
/* Called whenever a new services becomes available on the LAN or
836
969
is removed from the LAN */
837
970
971
if(quit_now){
972
return;
973
}
974
838
975
switch(event){
839
976
default:
840
977
case AVAHI_BROWSER_FAILURE:
841
978
842
979
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
845
982
return;
846
983
847
984
case AVAHI_BROWSER_NEW:
850
987
the callback function is called the Avahi server will free the
851
988
resolver for us. */
852
989
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
857
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
994
name, avahi_strerror(avahi_server_errno(mc.server)));
859
995
break;
860
996
861
997
case AVAHI_BROWSER_REMOVE:
870
1006
}
871
1007
}
872
1008
1009
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1011
if(quit_now){
1012
return;
1013
}
1014
quit_now = 1;
1015
signal_received = sig;
1016
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1021
}
1022
873
1023
int main(int argc, char *argv[]){
874
1024
AvahiSServiceBrowser *sb = NULL;
875
1025
int error;
876
1026
int ret;
877
1027
intmax_t tmpmax;
878
int numchars;
1028
char *tmp;
879
1029
int exitcode = EXIT_SUCCESS;
880
1030
const char *interface = "eth0";
881
1031
struct ifreq network;
882
int sd;
1032
int sd = -1;
1033
bool take_down_interface = false;
883
1034
uid_t uid;
884
1035
gid_t gid;
885
1036
char *connect_to = NULL;
889
1040
const char *seckey = PATHDIR "/" SECKEY;
890
1041
const char *pubkey = PATHDIR "/" PUBKEY;
891
1042
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
1043
bool gnutls_initialized = false;
896
1044
bool gpgme_initialized = false;
897
double delay = 2.5;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
898
1070
899
1071
{
900
1072
struct argp_option options[] = {
930
1102
.arg = "SECONDS",
931
1103
.doc = "Maximum delay to wait for interface startup",
932
1104
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
933
1114
{ .name = NULL }
934
1115
};
935
1116
936
1117
error_t parse_opt(int key, char *arg,
937
1118
struct argp_state *state){
1119
errno = 0;
938
1120
switch(key){
939
1121
case 128: /* --debug */
940
1122
debug = true;
952
1134
pubkey = arg;
953
1135
break;
954
1136
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'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
960
1142
}
961
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
962
1144
break;
964
1146
mc.priority = arg;
965
1147
break;
966
1148
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
971
1153
}
972
1154
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
976
1168
break;
977
1169
default:
978
1170
return ARGP_ERR_UNKNOWN;
979
1171
}
980
return 0;
1172
return errno;
981
1173
}
982
1174
983
1175
struct argp argp = { .options = options, .parser = parse_opt,
984
1176
.args_doc = "",
985
1177
.doc = "Mandos client -- Get and decrypt"
986
1178
" passwords from a Mandos server" };
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
990
exitcode = EXIT_FAILURE;
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
exitcode = EX_USAGE;
1192
goto end;
1193
}
1194
}
1195
1196
if(not debug){
1197
avahi_set_log_function(empty_log);
1198
}
1199
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
from the signal handler */
1202
/* Initialize the pseudo-RNG for Avahi */
1203
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1208
goto end;
1209
}
1210
1211
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
if(ret == -1){
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1216
goto end;
1217
}
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
if(ret == -1){
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1222
goto end;
1223
}
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
if(ret == -1){
1226
perror("sigaddset");
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
991
1270
goto end;
992
1271
}
993
1272
}
994
1273
995
1274
/* If the interface is down, bring it up */
996
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
997
1294
#ifdef __linux__
998
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1296
messages about the network interface to mess up the prompt */
1000
1297
ret = klogctl(8, NULL, 5);
1001
1298
bool restore_loglevel = true;
1002
1299
if(ret == -1){
1003
1300
restore_loglevel = false;
1004
1301
perror("klogctl");
1005
1302
}
1006
#endif
1303
#endif /* __linux__ */
1007
1304
1008
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
1306
if(sd < 0){
1010
1307
perror("socket");
1011
exitcode = EXIT_FAILURE;
1308
exitcode = EX_OSERR;
1012
1309
#ifdef __linux__
1013
1310
if(restore_loglevel){
1014
1311
ret = klogctl(7, NULL, 0);
1016
1313
perror("klogctl");
1017
1314
}
1018
1315
}
1019
#endif
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1020
1323
goto end;
1021
1324
}
1022
1325
strcpy(network.ifr_name, interface);
1030
1333
perror("klogctl");
1031
1334
}
1032
1335
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1035
1344
goto end;
1036
1345
}
1037
1346
if((network.ifr_flags & IFF_UP) == 0){
1038
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1039
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
1350
if(ret == -1){
1351
take_down_interface = false;
1041
1352
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1353
exitcode = EX_OSERR;
1043
1354
#ifdef __linux__
1044
1355
if(restore_loglevel){
1045
1356
ret = klogctl(7, NULL, 0);
1047
1358
perror("klogctl");
1048
1359
}
1049
1360
}
1050
#endif
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1051
1368
goto end;
1052
1369
}
1053
1370
}
1065
1382
perror("nanosleep");
1066
1383
}
1067
1384
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1071
1391
}
1072
1392
#ifdef __linux__
1073
1393
if(restore_loglevel){
1077
1397
perror("klogctl");
1078
1398
}
1079
1399
}
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);
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
goto end;
1420
}
1421
1422
ret = init_gnutls_global(pubkey, seckey);
1098
1423
if(ret == -1){
1099
1424
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1425
exitcode = EX_UNAVAILABLE;
1101
1426
goto end;
1102
1427
} else {
1103
1428
gnutls_initialized = true;
1104
1429
}
1105
1430
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1106
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1107
1438
perror("mkdtemp");
1108
1439
goto end;
1109
1440
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1113
1447
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
1448
exitcode = EX_UNAVAILABLE;
1115
1449
goto end;
1116
1450
} else {
1117
1451
gpgme_initialized = true;
1118
1452
}
1119
1453
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
}
1454
if(quit_now){
1455
goto end;
1127
1456
}
1128
1457
1129
1458
if(connect_to != NULL){
1132
1461
char *address = strrchr(connect_to, ':');
1133
1462
if(address == NULL){
1134
1463
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1138
1472
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'){
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1142
1477
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1146
1486
port = (uint16_t)tmpmax;
1147
1487
*address = '\0';
1148
1488
address = connect_to;
1153
1493
} else {
1154
1494
af = AF_INET;
1155
1495
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1158
1502
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1160
1522
} else {
1161
1523
exitcode = EXIT_SUCCESS;
1162
1524
}
1163
1525
goto end;
1164
1526
}
1165
1527
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;
1528
if(quit_now){
1178
1529
goto end;
1179
1530
}
1180
1531
1200
1551
if(mc.server == NULL){
1201
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
1553
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1204
1559
goto end;
1205
1560
}
1206
1561
1207
1562
/* Create the Avahi service browser */
1208
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1211
1566
if(sb == NULL){
1212
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1213
1568
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1215
1574
goto end;
1216
1575
}
1217
1576
1249
1608
gpgme_release(mc.ctx);
1250
1609
}
1251
1610
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1252
1643
/* Removes the temp directory used by GPGME */
1253
1644
if(tempdir_created){
1254
1645
DIR *d;
1293
1684
}
1294
1685
}
1295
1686
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1296
1706
return exitcode;
1297
1707
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0