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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:13:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209021358-6nrlc91oi08hn5hb
* initramfs-tools-hook: Whitespace change only.
- files removed:
- 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
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
61
#include <errno.h> /* perror(), errno */
66
62
#include <time.h> /* nanosleep(), time() */
71
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
68
*/
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
70
getuid(), getgid(), setuid(),
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
73
#include <iso646.h> /* not, or, and */
78
74
#include <argp.h> /* struct argp_option, error_t, struct
79
75
argp_state, struct argp,
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
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
88
78
#ifdef __linux__
89
79
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
80
#endif
91
81
92
82
/* Avahi */
93
83
/* All Avahi types, constants and functions
139
129
gpgme_ctx_t ctx;
140
130
} mandos_context;
141
131
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
150
132
/*
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
153
135
* "buffer_length" is how much is already used.
154
136
*/
155
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
156
138
size_t buffer_capacity){
157
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
167
149
/*
168
150
* Initialize GPGME.
169
151
*/
170
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
171
153
const char *pubkey, const char *tempdir){
154
int ret;
172
155
gpgme_error_t rc;
173
156
gpgme_engine_info_t engine_info;
174
157
177
160
* Helper function to insert pub and seckey to the engine keyring.
178
161
*/
179
162
bool import_key(const char *filename){
180
int ret;
181
163
int fd;
182
164
gpgme_data_t pgp_data;
183
165
194
176
return false;
195
177
}
196
178
197
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
198
180
if(rc != GPG_ERR_NO_ERROR){
199
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
182
gpgme_strsource(rc), gpgme_strerror(rc));
210
192
}
211
193
212
194
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
214
196
}
215
197
216
198
/* Init GPGME */
243
225
}
244
226
245
227
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
247
229
if(rc != GPG_ERR_NO_ERROR){
248
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
231
gpgme_strsource(rc), gpgme_strerror(rc));
254
236
return false;
255
237
}
256
238
257
return true;
239
return true;
258
240
}
259
241
260
242
/*
261
243
* Decrypt OpenPGP data.
262
244
* Returns -1 on error
263
245
*/
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
265
248
size_t crypto_size,
266
249
char **plaintext){
267
250
gpgme_data_t dh_crypto, dh_plain;
294
277
295
278
/* Decrypt data from the cryptotext data buffer to the plaintext
296
279
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
281
if(rc != GPG_ERR_NO_ERROR){
299
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
283
gpgme_strsource(rc), gpgme_strerror(rc));
301
284
plaintext_length = -1;
302
285
if(debug){
303
286
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
305
288
if(result == NULL){
306
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
307
290
} else {
314
297
}
315
298
gpgme_recipient_t recipient;
316
299
recipient = result->recipients;
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;
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
}
325
310
}
326
311
}
327
312
}
341
326
342
327
*plaintext = NULL;
343
328
while(true){
344
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
345
330
(size_t)plaintext_length,
346
331
plaintext_capacity);
347
332
if(plaintext_capacity == 0){
348
perror("incbuffer");
333
perror("adjustbuffer");
349
334
plaintext_length = -1;
350
335
goto decrypt_end;
351
336
}
397
382
fprintf(stderr, "GnuTLS: %s", string);
398
383
}
399
384
400
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
401
387
const char *seckeyfilename){
402
388
int ret;
403
389
421
407
}
422
408
423
409
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
425
411
if(ret != GNUTLS_E_SUCCESS){
426
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
413
from
439
425
}
440
426
441
427
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
443
429
GNUTLS_OPENPGP_FMT_BASE64);
444
430
if(ret != GNUTLS_E_SUCCESS){
445
431
fprintf(stderr,
451
437
}
452
438
453
439
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
455
441
if(ret != GNUTLS_E_SUCCESS){
456
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
443
" %s\n", safer_gnutls_strerror(ret));
458
444
goto globalfail;
459
445
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
447
if(ret != GNUTLS_E_SUCCESS){
462
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
449
safer_gnutls_strerror(ret));
464
450
goto globalfail;
465
451
}
466
452
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
454
469
455
return 0;
470
456
471
457
globalfail:
472
458
473
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
474
460
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
476
462
return -1;
477
463
}
478
464
479
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
480
467
int ret;
481
468
/* GnuTLS session creation */
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);
469
ret = gnutls_init(session, GNUTLS_SERVER);
488
470
if(ret != GNUTLS_E_SUCCESS){
489
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
472
safer_gnutls_strerror(ret));
492
474
493
475
{
494
476
const char *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);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
502
478
if(ret != GNUTLS_E_SUCCESS){
503
479
fprintf(stderr, "Syntax error at: %s\n", err);
504
480
fprintf(stderr, "GnuTLS error: %s\n",
508
484
}
509
485
}
510
486
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);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
519
489
if(ret != GNUTLS_E_SUCCESS){
520
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
491
safer_gnutls_strerror(ret));
524
494
}
525
495
526
496
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
528
499
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
501
531
502
return 0;
532
503
}
538
509
/* Called when a Mandos server is found */
539
510
static int start_mandos_communication(const char *ip, uint16_t port,
540
511
AvahiIfIndex if_index,
541
int af){
542
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
543
514
ssize_t sret;
544
515
union {
545
516
struct sockaddr_in in;
546
517
struct sockaddr_in6 in6;
547
518
} to;
548
519
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
550
521
size_t buffer_length = 0;
551
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
552
524
size_t written;
553
int retval = -1;
525
int retval = 0;
554
526
gnutls_session_t session;
555
527
int pf; /* Protocol family */
556
528
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
564
529
switch(af){
565
530
case AF_INET6:
566
531
pf = PF_INET6;
570
535
break;
571
536
default:
572
537
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
574
538
return -1;
575
539
}
576
540
577
ret = init_gnutls_session(&session);
541
ret = init_gnutls_session(mc, &session);
578
542
if(ret != 0){
579
543
return -1;
580
544
}
586
550
587
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
552
if(tcp_sd < 0){
589
int e = errno;
590
553
perror("socket");
591
errno = e;
592
goto mandos_end;
593
}
594
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
554
return -1;
598
555
}
599
556
600
557
memset(&to, 0, sizeof(to));
601
558
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
559
to.in6.sin6_family = (uint16_t)af;
603
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
604
561
} else { /* IPv4 */
605
562
to.in.sin_family = (sa_family_t)af;
606
563
ret = inet_pton(af, ip, &to.in.sin_addr);
607
564
}
608
565
if(ret < 0 ){
609
int e = errno;
610
566
perror("inet_pton");
611
errno = e;
612
goto mandos_end;
567
return -1;
613
568
}
614
569
if(ret == 0){
615
int e = errno;
616
570
fprintf(stderr, "Bad address: %s\n", ip);
617
errno = e;
618
goto mandos_end;
571
return -1;
619
572
}
620
573
if(af == AF_INET6){
621
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
628
581
if(if_index == AVAHI_IF_UNSPEC){
629
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
583
" without a network interface\n");
631
errno = EINVAL;
632
goto mandos_end;
584
return -1;
633
585
}
634
586
/* Set the network interface number as scope */
635
587
to.in6.sin6_scope_id = (uint32_t)if_index;
640
592
-Wunreachable-code */
641
593
}
642
594
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
647
648
595
if(debug){
649
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
597
char interface[IF_NAMESIZE];
677
624
}
678
625
}
679
626
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
627
if(af == AF_INET6){
686
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
629
} else {
688
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
631
}
690
632
if(ret < 0){
691
int e = errno;
692
633
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
634
return -1;
700
635
}
701
636
702
637
const char *out = mandos_protocol_version;
706
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
642
out_size - written));
708
643
if(ret == -1){
709
int e = errno;
710
644
perror("write");
711
errno = e;
645
retval = -1;
712
646
goto mandos_end;
713
647
}
714
648
written += (size_t)ret;
722
656
break;
723
657
}
724
658
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
659
}
731
660
732
661
if(debug){
733
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
734
663
}
735
664
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
666
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
667
do{
749
668
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
754
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
755
670
756
671
if(ret != GNUTLS_E_SUCCESS){
758
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
759
674
gnutls_perror(ret);
760
675
}
761
errno = EPROTO;
676
retval = -1;
762
677
goto mandos_end;
763
678
}
764
679
770
685
}
771
686
772
687
while(true){
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
buffer_capacity = incbuffer(&buffer, buffer_length,
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
780
689
buffer_capacity);
781
690
if(buffer_capacity == 0){
782
int e = errno;
783
perror("incbuffer");
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
691
perror("adjustbuffer");
692
retval = -1;
790
693
goto mandos_end;
791
694
}
792
695
801
704
case GNUTLS_E_AGAIN:
802
705
break;
803
706
case GNUTLS_E_REHANDSHAKE:
804
do {
707
do{
805
708
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
710
if(ret < 0){
813
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
814
712
gnutls_perror(ret);
815
errno = EPROTO;
713
retval = -1;
816
714
goto mandos_end;
817
715
}
818
716
break;
819
717
default:
820
718
fprintf(stderr, "Unknown error while reading data from"
821
719
" encrypted session with Mandos server\n");
720
retval = -1;
822
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
824
722
goto mandos_end;
825
723
}
826
724
} else {
832
730
fprintf(stderr, "Closing TLS session\n");
833
731
}
834
732
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);
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
847
734
848
735
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
851
737
buffer_length,
852
738
&decrypted_buffer);
853
739
if(decrypted_buffer_size >= 0){
854
855
740
written = 0;
856
741
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
862
742
ret = (int)fwrite(decrypted_buffer + written, 1,
863
743
(size_t)decrypted_buffer_size - written,
864
744
stdout);
865
745
if(ret == 0 and ferror(stdout)){
866
int e = errno;
867
746
if(debug){
868
747
fprintf(stderr, "Error writing encrypted data: %s\n",
869
748
strerror(errno));
870
749
}
871
errno = e;
872
goto mandos_end;
750
retval = -1;
751
break;
873
752
}
874
753
written += (size_t)ret;
875
754
}
876
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
877
758
}
759
} else {
760
retval = -1;
878
761
}
879
762
880
763
/* Shutdown procedure */
881
764
882
765
mandos_end:
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;
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
902
770
}
771
gnutls_deinit(session);
903
772
return retval;
904
773
}
905
774
916
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
787
flags,
919
AVAHI_GCC_UNUSED void* userdata){
788
void* userdata){
789
mandos_context *mc = userdata;
920
790
assert(r);
921
791
922
792
/* Called whenever a service has been resolved successfully or
923
793
timed out */
924
794
925
if(quit_now){
926
return;
927
}
928
929
795
switch(event){
930
796
default:
931
797
case AVAHI_RESOLVER_FAILURE:
932
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
800
avahi_strerror(avahi_server_errno(mc->server)));
935
801
break;
936
802
937
803
case AVAHI_RESOLVER_FOUND:
943
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
810
ip, (intmax_t)interface, port);
945
811
}
946
int ret = start_mandos_communication(ip, port, interface,
812
int ret = start_mandos_communication(ip, port, interface, mc,
947
813
avahi_proto_to_af(proto));
948
814
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
815
avahi_simple_poll_quit(mc->simple_poll);
950
816
}
951
817
}
952
818
}
962
828
const char *domain,
963
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
830
flags,
965
AVAHI_GCC_UNUSED void* userdata){
831
void* userdata){
832
mandos_context *mc = userdata;
966
833
assert(b);
967
834
968
835
/* Called whenever a new services becomes available on the LAN or
969
836
is removed from the LAN */
970
837
971
if(quit_now){
972
return;
973
}
974
975
838
switch(event){
976
839
default:
977
840
case AVAHI_BROWSER_FAILURE:
978
841
979
842
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
982
845
return;
983
846
984
847
case AVAHI_BROWSER_NEW:
987
850
the callback function is called the Avahi server will free the
988
851
resolver for us. */
989
852
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
993
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
858
name, avahi_strerror(avahi_server_errno(mc->server)));
995
859
break;
996
860
997
861
case AVAHI_BROWSER_REMOVE:
1006
870
}
1007
871
}
1008
872
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
1023
873
int main(int argc, char *argv[]){
1024
874
AvahiSServiceBrowser *sb = NULL;
1025
875
int error;
1026
876
int ret;
1027
877
intmax_t tmpmax;
1028
char *tmp;
878
int numchars;
1029
879
int exitcode = EXIT_SUCCESS;
1030
880
const char *interface = "eth0";
1031
881
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
882
int sd;
1034
883
uid_t uid;
1035
884
gid_t gid;
1036
885
char *connect_to = NULL;
1040
889
const char *seckey = PATHDIR "/" SECKEY;
1041
890
const char *pubkey = PATHDIR "/" PUBKEY;
1042
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1043
895
bool gnutls_initialized = false;
1044
896
bool gpgme_initialized = false;
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
}
897
double delay = 2.5;
1070
898
1071
899
{
1072
900
struct argp_option options[] = {
1102
930
.arg = "SECONDS",
1103
931
.doc = "Maximum delay to wait for interface startup",
1104
932
.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 },
1114
933
{ .name = NULL }
1115
934
};
1116
935
1117
936
error_t parse_opt(int key, char *arg,
1118
937
struct argp_state *state){
1119
errno = 0;
1120
938
switch(key){
1121
939
case 128: /* --debug */
1122
940
debug = true;
1134
952
pubkey = arg;
1135
953
break;
1136
954
case 129: /* --dh-bits */
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");
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);
1142
960
}
1143
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
962
break;
1146
964
mc.priority = arg;
1147
965
break;
1148
966
case 131: /* --delay */
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad 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);
1153
971
}
1154
972
break;
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);
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1168
976
break;
1169
977
default:
1170
978
return ARGP_ERR_UNKNOWN;
1171
979
}
1172
return errno;
980
return 0;
1173
981
}
1174
982
1175
983
struct argp argp = { .options = options, .parser = parse_opt,
1176
984
.args_doc = "",
1177
985
.doc = "Mandos client -- Get and decrypt"
1178
986
" passwords from a Mandos server" };
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;
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;
1270
991
goto end;
1271
992
}
1272
993
}
1273
994
1274
995
/* If the interface is down, bring it up */
1275
996
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
1294
997
#ifdef __linux__
1295
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1297
1000
ret = klogctl(8, NULL, 5);
1298
1001
bool restore_loglevel = true;
1299
1002
if(ret == -1){
1300
1003
restore_loglevel = false;
1301
1004
perror("klogctl");
1302
1005
}
1303
#endif /* __linux__ */
1006
#endif
1304
1007
1305
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
1009
if(sd < 0){
1307
1010
perror("socket");
1308
exitcode = EX_OSERR;
1011
exitcode = EXIT_FAILURE;
1309
1012
#ifdef __linux__
1310
1013
if(restore_loglevel){
1311
1014
ret = klogctl(7, NULL, 0);
1313
1016
perror("klogctl");
1314
1017
}
1315
1018
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1019
#endif
1323
1020
goto end;
1324
1021
}
1325
1022
strcpy(network.ifr_name, interface);
1333
1030
perror("klogctl");
1334
1031
}
1335
1032
}
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
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1344
1035
goto end;
1345
1036
}
1346
1037
if((network.ifr_flags & IFF_UP) == 0){
1347
1038
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
1040
if(ret == -1){
1351
take_down_interface = false;
1352
1041
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1042
exitcode = EXIT_FAILURE;
1354
1043
#ifdef __linux__
1355
1044
if(restore_loglevel){
1356
1045
ret = klogctl(7, NULL, 0);
1358
1047
perror("klogctl");
1359
1048
}
1360
1049
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1050
#endif
1368
1051
goto end;
1369
1052
}
1370
1053
}
1382
1065
perror("nanosleep");
1383
1066
}
1384
1067
}
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
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1391
1071
}
1392
1072
#ifdef __linux__
1393
1073
if(restore_loglevel){
1397
1077
perror("klogctl");
1398
1078
}
1399
1079
}
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);
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);
1423
1098
if(ret == -1){
1424
1099
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1100
exitcode = EXIT_FAILURE;
1426
1101
goto end;
1427
1102
} else {
1428
1103
gnutls_initialized = true;
1429
1104
}
1430
1105
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1436
1106
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
1107
perror("mkdtemp");
1439
1108
goto end;
1440
1109
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1447
1113
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1114
exitcode = EXIT_FAILURE;
1449
1115
goto end;
1450
1116
} else {
1451
1117
gpgme_initialized = true;
1452
1118
}
1453
1119
1454
if(quit_now){
1455
goto end;
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
}
1456
1127
}
1457
1128
1458
1129
if(connect_to != NULL){
1461
1132
char *address = strrchr(connect_to, ':');
1462
1133
if(address == NULL){
1463
1134
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1472
1138
uint16_t port;
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){
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1477
1142
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1486
1146
port = (uint16_t)tmpmax;
1487
1147
*address = '\0';
1488
1148
address = connect_to;
1493
1153
} else {
1494
1154
af = AF_INET;
1495
1155
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1502
1158
if(ret < 0){
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
}
1159
exitcode = EXIT_FAILURE;
1522
1160
} else {
1523
1161
exitcode = EXIT_SUCCESS;
1524
1162
}
1525
1163
goto end;
1526
1164
}
1527
1165
1528
if(quit_now){
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;
1529
1178
goto end;
1530
1179
}
1531
1180
1551
1200
if(mc.server == NULL){
1552
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
1202
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1203
exitcode = EXIT_FAILURE;
1559
1204
goto end;
1560
1205
}
1561
1206
1562
1207
/* Create the Avahi service browser */
1563
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1566
1211
if(sb == NULL){
1567
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1568
1213
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1214
exitcode = EXIT_FAILURE;
1574
1215
goto end;
1575
1216
}
1576
1217
1608
1249
gpgme_release(mc.ctx);
1609
1250
}
1610
1251
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
1643
1252
/* Removes the temp directory used by GPGME */
1644
1253
if(tempdir_created){
1645
1254
DIR *d;
1684
1293
}
1685
1294
}
1686
1295
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
1706
1296
return exitcode;
1707
1297
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0