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- Committer: Teddy Hogeborn
- Date: 2009-09-17 02:42:49 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917024249-y6j76xtzz3i2vptv
* plugins.d/mandos-client.c (init_gnutls_session): Always fail and
return immediately
if interrupted by
signal.
return immediately
if interrupted by
signal.
- 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() */
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(),
74
getuid(), getgid(), seteuid(),
71
75
setgid() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
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 room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
135
151
* "buffer_length" is how much is already used.
136
152
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
153
size_t incbuffer(char **buffer, size_t buffer_length,
138
154
size_t buffer_capacity){
139
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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
}
326
339
327
340
*plaintext = NULL;
328
341
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
342
plaintext_capacity = incbuffer(plaintext,
330
343
(size_t)plaintext_length,
331
344
plaintext_capacity);
332
345
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
346
perror("incbuffer");
334
347
plaintext_length = -1;
335
348
goto decrypt_end;
336
349
}
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;
520
547
char *decrypted_buffer;
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
551
int retval = 0;
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
retval = -1;
585
goto mandos_end;
586
}
587
588
if(quit_now){
589
retval = -1;
590
goto mandos_end;
555
591
}
556
592
557
593
memset(&to, 0, sizeof(to));
558
594
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
595
to.in6.sin6_family = (sa_family_t)af;
560
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
597
} else { /* IPv4 */
562
598
to.in.sin_family = (sa_family_t)af;
564
600
}
565
601
if(ret < 0 ){
566
602
perror("inet_pton");
567
return -1;
603
retval = -1;
604
goto mandos_end;
568
605
}
569
606
if(ret == 0){
570
607
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
608
retval = -1;
609
goto mandos_end;
572
610
}
573
611
if(af == AF_INET6){
574
612
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
619
if(if_index == AVAHI_IF_UNSPEC){
582
620
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
621
" without a network interface\n");
584
return -1;
622
retval = -1;
623
goto mandos_end;
585
624
}
586
625
/* Set the network interface number as scope */
587
626
to.in6.sin6_scope_id = (uint32_t)if_index;
592
631
-Wunreachable-code */
593
632
}
594
633
634
if(quit_now){
635
retval = -1;
636
goto mandos_end;
637
}
638
595
639
if(debug){
596
640
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
641
char interface[IF_NAMESIZE];
624
668
}
625
669
}
626
670
671
if(quit_now){
672
retval = -1;
673
goto mandos_end;
674
}
675
627
676
if(af == AF_INET6){
628
677
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
678
} else {
631
680
}
632
681
if(ret < 0){
633
682
perror("connect");
634
return -1;
683
retval = -1;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
retval = -1;
689
goto mandos_end;
635
690
}
636
691
637
692
const char *out = mandos_protocol_version;
656
711
break;
657
712
}
658
713
}
714
715
if(quit_now){
716
retval = -1;
717
goto mandos_end;
718
}
659
719
}
660
720
661
721
if(debug){
662
722
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
723
}
664
724
725
if(quit_now){
726
retval = -1;
727
goto mandos_end;
728
}
729
665
730
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
731
667
do{
732
if(quit_now){
733
retval = -1;
734
goto mandos_end;
735
}
736
737
do {
668
738
ret = gnutls_handshake(session);
739
if(quit_now){
740
retval = -1;
741
goto mandos_end;
742
}
669
743
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
744
671
745
if(ret != GNUTLS_E_SUCCESS){
685
759
}
686
760
687
761
while(true){
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
762
763
if(quit_now){
764
retval = -1;
765
goto mandos_end;
766
}
767
768
buffer_capacity = incbuffer(&buffer, buffer_length,
689
769
buffer_capacity);
690
770
if(buffer_capacity == 0){
691
perror("adjustbuffer");
771
perror("incbuffer");
772
retval = -1;
773
goto mandos_end;
774
}
775
776
if(quit_now){
692
777
retval = -1;
693
778
goto mandos_end;
694
779
}
704
789
case GNUTLS_E_AGAIN:
705
790
break;
706
791
case GNUTLS_E_REHANDSHAKE:
707
do{
792
do {
708
793
ret = gnutls_handshake(session);
794
795
if(quit_now){
796
retval = -1;
797
goto mandos_end;
798
}
709
799
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
800
if(ret < 0){
711
801
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
730
820
fprintf(stderr, "Closing TLS session\n");
731
821
}
732
822
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
if(quit_now){
824
retval = -1;
825
goto mandos_end;
826
}
827
828
do {
829
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
830
if(quit_now){
831
retval = -1;
832
goto mandos_end;
833
}
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
835
735
836
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
837
ssize_t decrypted_buffer_size;
838
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
839
buffer_length,
738
840
&decrypted_buffer);
739
841
if(decrypted_buffer_size >= 0){
842
740
843
written = 0;
741
844
while(written < (size_t) decrypted_buffer_size){
845
if(quit_now){
846
retval = -1;
847
goto mandos_end;
848
}
849
742
850
ret = (int)fwrite(decrypted_buffer + written, 1,
743
851
(size_t)decrypted_buffer_size - written,
744
852
stdout);
764
872
765
873
mandos_end:
766
874
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
875
if(tcp_sd >= 0){
876
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
877
}
768
878
if(ret == -1){
769
879
perror("close");
770
880
}
771
881
gnutls_deinit(session);
882
if(quit_now){
883
retval = -1;
884
}
772
885
return retval;
773
886
}
774
887
785
898
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
899
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
900
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
901
AVAHI_GCC_UNUSED void* userdata){
790
902
assert(r);
791
903
792
904
/* Called whenever a service has been resolved successfully or
793
905
timed out */
794
906
907
if(quit_now){
908
return;
909
}
910
795
911
switch(event){
796
912
default:
797
913
case AVAHI_RESOLVER_FAILURE:
798
914
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
915
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
916
avahi_strerror(avahi_server_errno(mc.server)));
801
917
break;
802
918
803
919
case AVAHI_RESOLVER_FOUND:
809
925
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
926
ip, (intmax_t)interface, port);
811
927
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
928
int ret = start_mandos_communication(ip, port, interface,
813
929
avahi_proto_to_af(proto));
814
930
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
931
avahi_simple_poll_quit(mc.simple_poll);
816
932
}
817
933
}
818
934
}
828
944
const char *domain,
829
945
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
946
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
947
AVAHI_GCC_UNUSED void* userdata){
833
948
assert(b);
834
949
835
950
/* Called whenever a new services becomes available on the LAN or
836
951
is removed from the LAN */
837
952
953
if(quit_now){
954
return;
955
}
956
838
957
switch(event){
839
958
default:
840
959
case AVAHI_BROWSER_FAILURE:
841
960
842
961
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
962
avahi_strerror(avahi_server_errno(mc.server)));
963
avahi_simple_poll_quit(mc.simple_poll);
845
964
return;
846
965
847
966
case AVAHI_BROWSER_NEW:
850
969
the callback function is called the Avahi server will free the
851
970
resolver for us. */
852
971
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
972
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
973
name, type, domain, protocol, 0,
974
resolve_callback, NULL) == NULL)
857
975
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
976
name, avahi_strerror(avahi_server_errno(mc.server)));
859
977
break;
860
978
861
979
case AVAHI_BROWSER_REMOVE:
870
988
}
871
989
}
872
990
991
/* stop main loop after sigterm has been called */
992
static void handle_sigterm(int sig){
993
if(quit_now){
994
return;
995
}
996
quit_now = 1;
997
signal_received = sig;
998
int old_errno = errno;
999
if(mc.simple_poll != NULL){
1000
avahi_simple_poll_quit(mc.simple_poll);
1001
}
1002
errno = old_errno;
1003
}
1004
873
1005
int main(int argc, char *argv[]){
874
1006
AvahiSServiceBrowser *sb = NULL;
875
1007
int error;
876
1008
int ret;
877
1009
intmax_t tmpmax;
878
int numchars;
1010
char *tmp;
879
1011
int exitcode = EXIT_SUCCESS;
880
1012
const char *interface = "eth0";
881
1013
struct ifreq network;
882
int sd;
1014
int sd = -1;
1015
bool take_down_interface = false;
883
1016
uid_t uid;
884
1017
gid_t gid;
885
1018
char *connect_to = NULL;
889
1022
const char *seckey = PATHDIR "/" SECKEY;
890
1023
const char *pubkey = PATHDIR "/" PUBKEY;
891
1024
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
1025
bool gnutls_initialized = false;
896
1026
bool gpgme_initialized = false;
897
double delay = 2.5;
1027
float delay = 2.5f;
1028
1029
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1030
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1031
1032
uid = getuid();
1033
gid = getgid();
1034
1035
/* Lower any group privileges we might have, just to be safe */
1036
errno = 0;
1037
ret = setgid(gid);
1038
if(ret == -1){
1039
perror("setgid");
1040
}
1041
1042
/* Lower user privileges (temporarily) */
1043
errno = 0;
1044
ret = seteuid(uid);
1045
if(ret == -1){
1046
perror("seteuid");
1047
}
1048
1049
if(quit_now){
1050
goto end;
1051
}
898
1052
899
1053
{
900
1054
struct argp_option options[] = {
952
1106
pubkey = arg;
953
1107
break;
954
1108
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'){
1109
errno = 0;
1110
tmpmax = strtoimax(arg, &tmp, 10);
1111
if(errno != 0 or tmp == arg or *tmp != '\0'
1112
or tmpmax != (typeof(mc.dh_bits))tmpmax){
958
1113
fprintf(stderr, "Bad number of DH bits\n");
959
1114
exit(EXIT_FAILURE);
960
1115
}
964
1119
mc.priority = arg;
965
1120
break;
966
1121
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
1122
errno = 0;
1123
delay = strtof(arg, &tmp);
1124
if(errno != 0 or tmp == arg or *tmp != '\0'){
969
1125
fprintf(stderr, "Bad delay\n");
970
1126
exit(EXIT_FAILURE);
971
1127
}
992
1148
}
993
1149
}
994
1150
1151
if(not debug){
1152
avahi_set_log_function(empty_log);
1153
}
1154
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
from the signal handler */
1157
/* Initialize the pseudo-RNG for Avahi */
1158
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
1166
sigemptyset(&sigterm_action.sa_mask);
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1177
goto end;
1178
}
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
/* Need to check if the handler is SIG_IGN before handling:
1186
| [[info:libc:Initial Signal Actions]] |
1187
| [[info:libc:Basic Signal Handling]] |
1188
*/
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1206
}
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
}
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1219
}
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
}
1228
995
1229
/* If the interface is down, bring it up */
996
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
997
1249
#ifdef __linux__
998
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
1251
messages to mess up the prompt */
1003
1255
restore_loglevel = false;
1004
1256
perror("klogctl");
1005
1257
}
1006
#endif
1258
#endif /* __linux__ */
1007
1259
1008
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
1261
if(sd < 0){
1016
1268
perror("klogctl");
1017
1269
}
1018
1270
}
1019
#endif
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1020
1278
goto end;
1021
1279
}
1022
1280
strcpy(network.ifr_name, interface);
1030
1288
perror("klogctl");
1031
1289
}
1032
1290
}
1033
#endif
1291
#endif /* __linux__ */
1034
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1035
1299
goto end;
1036
1300
}
1037
1301
if((network.ifr_flags & IFF_UP) == 0){
1038
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1039
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
1305
if(ret == -1){
1306
take_down_interface = false;
1041
1307
perror("ioctl SIOCSIFFLAGS");
1042
1308
exitcode = EXIT_FAILURE;
1043
1309
#ifdef __linux__
1047
1313
perror("klogctl");
1048
1314
}
1049
1315
}
1050
#endif
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1051
1323
goto end;
1052
1324
}
1053
1325
}
1065
1337
perror("nanosleep");
1066
1338
}
1067
1339
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1071
1346
}
1072
1347
#ifdef __linux__
1073
1348
if(restore_loglevel){
1077
1352
perror("klogctl");
1078
1353
}
1079
1354
}
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);
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
1371
}
1372
1373
if(quit_now){
1374
goto end;
1375
}
1376
1377
ret = init_gnutls_global(pubkey, seckey);
1098
1378
if(ret == -1){
1099
1379
fprintf(stderr, "init_gnutls_global failed\n");
1100
1380
exitcode = EXIT_FAILURE;
1103
1383
gnutls_initialized = true;
1104
1384
}
1105
1385
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1106
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1107
1393
perror("mkdtemp");
1108
1394
goto end;
1109
1395
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1113
1402
fprintf(stderr, "init_gpgme failed\n");
1114
1403
exitcode = EXIT_FAILURE;
1115
1404
goto end;
1117
1406
gpgme_initialized = true;
1118
1407
}
1119
1408
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
}
1409
if(quit_now){
1410
goto end;
1127
1411
}
1128
1412
1129
1413
if(connect_to != NULL){
1135
1419
exitcode = EXIT_FAILURE;
1136
1420
goto end;
1137
1421
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1138
1427
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'){
1428
errno = 0;
1429
tmpmax = strtoimax(address+1, &tmp, 10);
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1142
1432
fprintf(stderr, "Bad port number\n");
1143
1433
exitcode = EXIT_FAILURE;
1144
1434
goto end;
1145
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1146
1441
port = (uint16_t)tmpmax;
1147
1442
*address = '\0';
1148
1443
address = connect_to;
1153
1448
} else {
1154
1449
af = AF_INET;
1155
1450
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1158
1457
if(ret < 0){
1159
1458
exitcode = EXIT_FAILURE;
1160
1459
} else {
1163
1462
goto end;
1164
1463
}
1165
1464
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;
1465
if(quit_now){
1178
1466
goto end;
1179
1467
}
1180
1468
1204
1492
goto end;
1205
1493
}
1206
1494
1495
if(quit_now){
1496
goto end;
1497
}
1498
1207
1499
/* Create the Avahi service browser */
1208
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
NULL, 0, browse_callback, NULL);
1211
1503
if(sb == NULL){
1212
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1213
1505
avahi_strerror(avahi_server_errno(mc.server)));
1215
1507
goto end;
1216
1508
}
1217
1509
1510
if(quit_now){
1511
goto end;
1512
}
1513
1218
1514
/* Run the main loop */
1219
1515
1220
1516
if(debug){
1249
1545
gpgme_release(mc.ctx);
1250
1546
}
1251
1547
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1252
1580
/* Removes the temp directory used by GPGME */
1253
1581
if(tempdir_created){
1254
1582
DIR *d;
1293
1621
}
1294
1622
}
1295
1623
1624
if(quit_now){
1625
sigemptyset(&old_sigterm_action.sa_mask);
1626
old_sigterm_action.sa_handler = SIG_DFL;
1627
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1628
if(ret == -1){
1629
perror("sigaction");
1630
}
1631
raise(signal_received);
1632
}
1633
1296
1634
return exitcode;
1297
1635
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0