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- Committer: Teddy Hogeborn
- Date: 2009-02-05 02:42:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205024239-th0d287ifnl7l3tv
* plugin-runner.c (handle_sigchld): Clarify logic.
- 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
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
56
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
63
#include <errno.h> /* perror(), errno */
66
64
#include <time.h> /* nanosleep(), time() */
67
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
66
SIOCSIFFLAGS, if_indextoname(),
69
67
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
68
#include <netinet/in.h>
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
70
getuid(), getgid(), setuid(),
75
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
73
#include <iso646.h> /* not, and, or */
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
86
78
#ifdef __linux__
87
79
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
80
#endif
89
81
90
82
/* Avahi */
91
83
/* All Avahi types, constants and functions
137
129
gpgme_ctx_t ctx;
138
130
} mandos_context;
139
131
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
132
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* 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,
148
135
* "buffer_length" is how much is already used.
149
136
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
138
size_t buffer_capacity){
152
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
162
149
/*
163
150
* Initialize GPGME.
164
151
*/
165
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
153
const char *pubkey, const char *tempdir){
167
154
int ret;
168
155
gpgme_error_t rc;
189
176
return false;
190
177
}
191
178
192
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
193
180
if(rc != GPG_ERR_NO_ERROR){
194
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
182
gpgme_strsource(rc), gpgme_strerror(rc));
205
192
}
206
193
207
194
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
209
196
}
210
197
211
198
/* Init GPGME */
238
225
}
239
226
240
227
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
242
229
if(rc != GPG_ERR_NO_ERROR){
243
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
231
gpgme_strsource(rc), gpgme_strerror(rc));
249
236
return false;
250
237
}
251
238
252
return true;
239
return true;
253
240
}
254
241
255
242
/*
256
243
* Decrypt OpenPGP data.
257
244
* Returns -1 on error
258
245
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
260
248
size_t crypto_size,
261
249
char **plaintext){
262
250
gpgme_data_t dh_crypto, dh_plain;
289
277
290
278
/* Decrypt data from the cryptotext data buffer to the plaintext
291
279
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
281
if(rc != GPG_ERR_NO_ERROR){
294
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
283
gpgme_strsource(rc), gpgme_strerror(rc));
296
284
plaintext_length = -1;
297
285
if(debug){
298
286
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
300
288
if(result == NULL){
301
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
290
} else {
309
297
}
310
298
gpgme_recipient_t recipient;
311
299
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
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
}
320
310
}
321
311
}
322
312
}
336
326
337
327
*plaintext = NULL;
338
328
while(true){
339
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
340
330
(size_t)plaintext_length,
341
331
plaintext_capacity);
342
332
if(plaintext_capacity == 0){
343
perror("incbuffer");
333
perror("adjustbuffer");
344
334
plaintext_length = -1;
345
335
goto decrypt_end;
346
336
}
392
382
fprintf(stderr, "GnuTLS: %s", string);
393
383
}
394
384
395
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
396
387
const char *seckeyfilename){
397
388
int ret;
398
389
416
407
}
417
408
418
409
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
420
411
if(ret != GNUTLS_E_SUCCESS){
421
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
413
* from
414
* -Wunreachable-code
415
*/
425
416
safer_gnutls_strerror(ret));
426
417
gnutls_global_deinit();
427
418
return -1;
434
425
}
435
426
436
427
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
438
429
GNUTLS_OPENPGP_FMT_BASE64);
439
430
if(ret != GNUTLS_E_SUCCESS){
440
431
fprintf(stderr,
446
437
}
447
438
448
439
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
450
441
if(ret != GNUTLS_E_SUCCESS){
451
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
443
" %s\n", safer_gnutls_strerror(ret));
453
444
goto globalfail;
454
445
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
447
if(ret != GNUTLS_E_SUCCESS){
457
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
449
safer_gnutls_strerror(ret));
459
450
goto globalfail;
460
451
}
461
452
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
454
464
455
return 0;
465
456
466
457
globalfail:
467
458
468
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
469
460
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
471
462
return -1;
472
463
}
473
464
474
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
475
467
int ret;
476
468
/* GnuTLS session creation */
477
469
ret = gnutls_init(session, GNUTLS_SERVER);
482
474
483
475
{
484
476
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
486
478
if(ret != GNUTLS_E_SUCCESS){
487
479
fprintf(stderr, "Syntax error at: %s\n", err);
488
480
fprintf(stderr, "GnuTLS error: %s\n",
493
485
}
494
486
495
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
488
mc->cred);
497
489
if(ret != GNUTLS_E_SUCCESS){
498
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
491
safer_gnutls_strerror(ret));
505
497
gnutls_certificate_server_set_request(*session,
506
498
GNUTLS_CERT_IGNORE);
507
499
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
509
501
510
502
return 0;
511
503
}
514
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
507
__attribute__((unused)) const char *txt){}
516
508
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
509
/* Called when a Mandos server is found */
521
510
static int start_mandos_communication(const char *ip, uint16_t port,
522
511
AvahiIfIndex if_index,
523
int af){
524
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
525
514
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
530
516
char *buffer = NULL;
531
517
char *decrypted_buffer;
532
518
size_t buffer_length = 0;
534
520
ssize_t decrypted_buffer_size;
535
521
size_t written;
536
522
int retval = 0;
523
char interface[IF_NAMESIZE];
537
524
gnutls_session_t session;
538
int pf; /* Protocol family */
539
540
if(quit_now){
541
return -1;
542
}
543
544
switch(af){
545
case AF_INET6:
546
pf = PF_INET6;
547
break;
548
case AF_INET:
549
pf = PF_INET;
550
break;
551
default:
552
fprintf(stderr, "Bad address family: %d\n", af);
553
return -1;
554
}
555
556
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
557
527
if(ret != 0){
558
528
return -1;
559
529
}
560
530
561
531
if(debug){
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
563
533
"\n", ip, port);
564
534
}
565
535
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
567
537
if(tcp_sd < 0){
568
538
perror("socket");
569
retval = -1;
570
goto mandos_end;
539
return -1;
571
540
}
572
541
573
if(quit_now){
574
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
575
548
}
576
549
577
550
memset(&to, 0, sizeof(to));
578
if(af == AF_INET6){
579
to.in6.sin6_family = (sa_family_t)af;
580
ret = inet_pton(af, ip, &to.in6.sin6_addr);
581
} else { /* IPv4 */
582
to.in.sin_family = (sa_family_t)af;
583
ret = inet_pton(af, ip, &to.in.sin_addr);
584
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
585
555
if(ret < 0 ){
586
556
perror("inet_pton");
587
retval = -1;
588
goto mandos_end;
557
return -1;
589
558
}
590
559
if(ret == 0){
591
560
fprintf(stderr, "Bad address: %s\n", ip);
592
retval = -1;
593
goto mandos_end;
561
return -1;
594
562
}
595
if(af == AF_INET6){
596
to.in6.sin6_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
600
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
601
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
602
-Wunreachable-code*/
603
if(if_index == AVAHI_IF_UNSPEC){
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
605
" without a network interface\n");
606
retval = -1;
607
goto mandos_end;
608
}
609
/* Set the network interface number as scope */
610
to.in6.sin6_scope_id = (uint32_t)if_index;
611
}
612
} else {
613
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
614
564
-Wconversion and
615
565
-Wunreachable-code */
616
}
617
566
618
if(quit_now){
619
goto mandos_end;
620
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
621
568
622
569
if(debug){
623
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
624
char interface[IF_NAMESIZE];
625
if(if_indextoname((unsigned int)if_index, interface) == NULL){
626
perror("if_indextoname");
627
} else {
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
629
ip, interface, port);
630
}
631
} else {
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
633
port);
634
}
635
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
636
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
637
const char *pcret;
638
if(af == AF_INET6){
639
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
640
sizeof(addrstr));
641
} else {
642
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
643
sizeof(addrstr));
644
}
645
if(pcret == NULL){
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
646
575
perror("inet_ntop");
647
576
} else {
648
577
if(strcmp(addrstr, ip) != 0){
651
580
}
652
581
}
653
582
654
if(quit_now){
655
goto mandos_end;
656
}
657
658
if(af == AF_INET6){
659
ret = connect(tcp_sd, &to.in6, sizeof(to));
660
} else {
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
662
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
663
584
if(ret < 0){
664
585
perror("connect");
665
retval = -1;
666
goto mandos_end;
667
}
668
669
if(quit_now){
670
goto mandos_end;
586
return -1;
671
587
}
672
588
673
589
const char *out = mandos_protocol_version;
692
608
break;
693
609
}
694
610
}
695
696
if(quit_now){
697
goto mandos_end;
698
}
699
611
}
700
612
701
613
if(debug){
702
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
703
615
}
704
616
705
if(quit_now){
706
goto mandos_end;
707
}
708
709
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
710
618
711
if(quit_now){
712
goto mandos_end;
713
}
714
715
619
do{
716
620
ret = gnutls_handshake(session);
717
if(quit_now){
718
goto mandos_end;
719
}
720
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
622
722
623
if(ret != GNUTLS_E_SUCCESS){
731
632
/* Read OpenPGP packet that contains the wanted password */
732
633
733
634
if(debug){
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
735
636
ip);
736
637
}
737
638
738
639
while(true){
739
740
if(quit_now){
741
goto mandos_end;
742
}
743
744
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
745
641
buffer_capacity);
746
642
if(buffer_capacity == 0){
747
perror("incbuffer");
643
perror("adjustbuffer");
748
644
retval = -1;
749
645
goto mandos_end;
750
646
}
751
647
752
if(quit_now){
753
goto mandos_end;
754
}
755
756
648
sret = gnutls_record_recv(session, buffer+buffer_length,
757
649
BUFFER_SIZE);
758
650
if(sret == 0){
766
658
case GNUTLS_E_REHANDSHAKE:
767
659
do{
768
660
ret = gnutls_handshake(session);
769
770
if(quit_now){
771
goto mandos_end;
772
}
773
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
774
662
if(ret < 0){
775
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
794
682
fprintf(stderr, "Closing TLS session\n");
795
683
}
796
684
797
if(quit_now){
798
goto mandos_end;
799
}
800
801
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
686
803
if(quit_now){
804
goto mandos_end;
805
}
806
807
687
if(buffer_length > 0){
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
809
689
buffer_length,
810
690
&decrypted_buffer);
811
691
if(decrypted_buffer_size >= 0){
812
692
written = 0;
813
693
while(written < (size_t) decrypted_buffer_size){
814
if(quit_now){
815
goto mandos_end;
816
}
817
818
694
ret = (int)fwrite(decrypted_buffer + written, 1,
819
695
(size_t)decrypted_buffer_size - written,
820
696
stdout);
840
716
841
717
mandos_end:
842
718
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
720
if(ret == -1){
847
721
perror("close");
848
722
}
849
723
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
852
}
853
724
return retval;
854
725
}
855
726
856
727
static void resolve_callback(AvahiSServiceResolver *r,
857
728
AvahiIfIndex interface,
858
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
730
AvahiResolverEvent event,
860
731
const char *name,
861
732
const char *type,
866
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
867
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
868
739
flags,
869
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
870
742
assert(r);
871
743
872
744
/* Called whenever a service has been resolved successfully or
873
745
timed out */
874
746
875
if(quit_now){
876
return;
877
}
878
879
747
switch(event){
880
748
default:
881
749
case AVAHI_RESOLVER_FAILURE:
882
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
883
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
884
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
885
753
break;
886
754
887
755
case AVAHI_RESOLVER_FOUND:
893
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
894
762
ip, (intmax_t)interface, port);
895
763
}
896
int ret = start_mandos_communication(ip, port, interface,
897
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
898
765
if(ret == 0){
899
avahi_simple_poll_quit(mc.simple_poll);
766
avahi_simple_poll_quit(mc->simple_poll);
900
767
}
901
768
}
902
769
}
912
779
const char *domain,
913
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
914
781
flags,
915
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
916
784
assert(b);
917
785
918
786
/* Called whenever a new services becomes available on the LAN or
919
787
is removed from the LAN */
920
788
921
if(quit_now){
922
return;
923
}
924
925
789
switch(event){
926
790
default:
927
791
case AVAHI_BROWSER_FAILURE:
928
792
929
793
fprintf(stderr, "(Avahi browser) %s\n",
930
avahi_strerror(avahi_server_errno(mc.server)));
931
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
932
796
return;
933
797
934
798
case AVAHI_BROWSER_NEW:
937
801
the callback function is called the Avahi server will free the
938
802
resolver for us. */
939
803
940
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
941
name, type, domain, protocol, 0,
942
resolve_callback, NULL) == NULL)
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
943
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
944
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
945
810
break;
946
811
947
812
case AVAHI_BROWSER_REMOVE:
956
821
}
957
822
}
958
823
959
/* stop main loop after sigterm has been called */
960
static void handle_sigterm(int sig){
961
if(quit_now){
962
return;
963
}
964
quit_now = 1;
965
signal_received = sig;
966
int old_errno = errno;
967
if(mc.simple_poll != NULL){
968
avahi_simple_poll_quit(mc.simple_poll);
969
}
970
errno = old_errno;
971
}
972
973
824
int main(int argc, char *argv[]){
974
825
AvahiSServiceBrowser *sb = NULL;
975
826
int error;
976
827
int ret;
977
828
intmax_t tmpmax;
978
char *tmp;
829
int numchars;
979
830
int exitcode = EXIT_SUCCESS;
980
831
const char *interface = "eth0";
981
832
struct ifreq network;
982
int sd = -1;
983
bool take_down_interface = false;
833
int sd;
984
834
uid_t uid;
985
835
gid_t gid;
986
836
char *connect_to = NULL;
990
840
const char *seckey = PATHDIR "/" SECKEY;
991
841
const char *pubkey = PATHDIR "/" PUBKEY;
992
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
993
846
bool gnutls_initialized = false;
994
847
bool gpgme_initialized = false;
995
float delay = 2.5f;
996
997
struct sigaction old_sigterm_action;
998
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
848
double delay = 2.5;
999
849
1000
850
{
1001
851
struct argp_option options[] = {
1007
857
.group = 1 },
1008
858
{ .name = "interface", .key = 'i',
1009
859
.arg = "NAME",
1010
.doc = "Network interface that will be used to search for"
1011
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1012
862
.group = 1 },
1013
863
{ .name = "seckey", .key = 's',
1014
864
.arg = "FILE",
1053
903
pubkey = arg;
1054
904
break;
1055
905
case 129: /* --dh-bits */
1056
errno = 0;
1057
tmpmax = strtoimax(arg, &tmp, 10);
1058
if(errno != 0 or tmp == arg or *tmp != '\0'
1059
or tmpmax != (typeof(mc.dh_bits))tmpmax){
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
1060
909
fprintf(stderr, "Bad number of DH bits\n");
1061
910
exit(EXIT_FAILURE);
1062
911
}
1066
915
mc.priority = arg;
1067
916
break;
1068
917
case 131: /* --delay */
1069
errno = 0;
1070
delay = strtof(arg, &tmp);
1071
if(errno != 0 or tmp == arg or *tmp != '\0'){
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
1072
920
fprintf(stderr, "Bad delay\n");
1073
921
exit(EXIT_FAILURE);
1074
922
}
1095
943
}
1096
944
}
1097
945
1098
if(not debug){
1099
avahi_set_log_function(empty_log);
1100
}
1101
1102
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1103
from the signal handler */
1104
/* Initialize the pseudo-RNG for Avahi */
1105
srand((unsigned int) time(NULL));
1106
mc.simple_poll = avahi_simple_poll_new();
1107
if(mc.simple_poll == NULL){
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1109
exitcode = EXIT_FAILURE;
1110
goto end;
1111
}
1112
1113
sigemptyset(&sigterm_action.sa_mask);
1114
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1115
if(ret == -1){
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1118
goto end;
1119
}
1120
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1121
if(ret == -1){
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1124
goto end;
1125
}
1126
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1127
if(ret == -1){
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1130
goto end;
1131
}
1132
/* Need to check if the handler is SIG_IGN before handling:
1133
| [[info:libc:Initial Signal Actions]] |
1134
| [[info:libc:Basic Signal Handling]] |
1135
*/
1136
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1137
if(ret == -1){
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1140
}
1141
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
ret = sigaction(SIGINT, &sigterm_action, NULL);
1143
if(ret == -1){
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1148
}
1149
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1150
if(ret == -1){
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1153
}
1154
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1156
if(ret == -1){
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1159
goto end;
1160
}
1161
}
1162
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1163
if(ret == -1){
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1166
}
1167
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1169
if(ret == -1){
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1172
goto end;
1173
}
1174
}
1175
1176
946
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
1178
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
if(if_index == 0){
1180
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
947
{
1189
948
#ifdef __linux__
1190
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
950
messages to mess up the prompt */
1192
951
ret = klogctl(8, NULL, 5);
1193
bool restore_loglevel = true;
1194
952
if(ret == -1){
1195
restore_loglevel = false;
1196
953
perror("klogctl");
1197
954
}
1198
#endif /* __linux__ */
955
#endif
1199
956
1200
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
958
if(sd < 0){
1202
959
perror("socket");
1203
960
exitcode = EXIT_FAILURE;
1204
961
#ifdef __linux__
1205
if(restore_loglevel){
1206
ret = klogctl(7, NULL, 0);
1207
if(ret == -1){
1208
perror("klogctl");
1209
}
962
ret = klogctl(7, NULL, 0);
963
if(ret == -1){
964
perror("klogctl");
1210
965
}
1211
#endif /* __linux__ */
966
#endif
1212
967
goto end;
1213
968
}
1214
969
strcpy(network.ifr_name, interface);
1216
971
if(ret == -1){
1217
972
perror("ioctl SIOCGIFFLAGS");
1218
973
#ifdef __linux__
1219
if(restore_loglevel){
1220
ret = klogctl(7, NULL, 0);
1221
if(ret == -1){
1222
perror("klogctl");
1223
}
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
1224
977
}
1225
#endif /* __linux__ */
978
#endif
1226
979
exitcode = EXIT_FAILURE;
1227
980
goto end;
1228
981
}
1229
982
if((network.ifr_flags & IFF_UP) == 0){
1230
983
network.ifr_flags |= IFF_UP;
1231
take_down_interface = true;
1232
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1233
985
if(ret == -1){
1234
take_down_interface = false;
1235
986
perror("ioctl SIOCSIFFLAGS");
1236
987
exitcode = EXIT_FAILURE;
1237
988
#ifdef __linux__
1238
if(restore_loglevel){
1239
ret = klogctl(7, NULL, 0);
1240
if(ret == -1){
1241
perror("klogctl");
1242
}
989
ret = klogctl(7, NULL, 0);
990
if(ret == -1){
991
perror("klogctl");
1243
992
}
1244
#endif /* __linux__ */
993
#endif
1245
994
goto end;
1246
995
}
1247
996
}
1259
1008
perror("nanosleep");
1260
1009
}
1261
1010
}
1262
if(not take_down_interface){
1263
/* We won't need the socket anymore */
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1265
if(ret == -1){
1266
perror("close");
1267
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1268
1014
}
1269
1015
#ifdef __linux__
1270
if(restore_loglevel){
1271
/* Restores kernel loglevel to default */
1272
ret = klogctl(7, NULL, 0);
1273
if(ret == -1){
1274
perror("klogctl");
1275
}
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1276
1020
}
1277
#endif /* __linux__ */
1278
}
1279
1280
if(quit_now){
1281
goto end;
1021
#endif
1282
1022
}
1283
1023
1284
1024
uid = getuid();
1285
1025
gid = getgid();
1286
1026
1287
errno = 0;
1288
1027
setgid(gid);
1289
1028
if(ret == -1){
1290
1029
perror("setgid");
1295
1034
perror("setuid");
1296
1035
}
1297
1036
1298
if(quit_now){
1299
goto end;
1300
}
1301
1302
ret = init_gnutls_global(pubkey, seckey);
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1303
1038
if(ret == -1){
1304
1039
fprintf(stderr, "init_gnutls_global failed\n");
1305
1040
exitcode = EXIT_FAILURE;
1308
1043
gnutls_initialized = true;
1309
1044
}
1310
1045
1311
if(quit_now){
1312
goto end;
1313
}
1314
1315
tempdir_created = true;
1316
1046
if(mkdtemp(tempdir) == NULL){
1317
tempdir_created = false;
1318
1047
perror("mkdtemp");
1319
1048
goto end;
1320
1049
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
if(not init_gpgme(pubkey, seckey, tempdir)){
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1327
1053
fprintf(stderr, "init_gpgme failed\n");
1328
1054
exitcode = EXIT_FAILURE;
1329
1055
goto end;
1331
1057
gpgme_initialized = true;
1332
1058
}
1333
1059
1334
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1335
1064
goto end;
1336
1065
}
1337
1066
1344
1073
exitcode = EXIT_FAILURE;
1345
1074
goto end;
1346
1075
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
1076
uint16_t port;
1353
errno = 0;
1354
tmpmax = strtoimax(address+1, &tmp, 10);
1355
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1356
or tmpmax != (uint16_t)tmpmax){
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1357
1080
fprintf(stderr, "Bad port number\n");
1358
1081
exitcode = EXIT_FAILURE;
1359
1082
goto end;
1360
1083
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
1084
port = (uint16_t)tmpmax;
1367
1085
*address = '\0';
1368
1086
address = connect_to;
1369
/* Colon in address indicates IPv6 */
1370
int af;
1371
if(strchr(address, ':') != NULL){
1372
af = AF_INET6;
1373
} else {
1374
af = AF_INET;
1375
}
1376
1377
if(quit_now){
1378
goto end;
1379
}
1380
1381
ret = start_mandos_communication(address, port, if_index, af);
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1382
1088
if(ret < 0){
1383
1089
exitcode = EXIT_FAILURE;
1384
1090
} else {
1387
1093
goto end;
1388
1094
}
1389
1095
1390
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
1391
1108
goto end;
1392
1109
}
1393
1110
1417
1134
goto end;
1418
1135
}
1419
1136
1420
if(quit_now){
1421
goto end;
1422
}
1423
1424
1137
/* Create the Avahi service browser */
1425
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1426
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1427
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1428
1141
if(sb == NULL){
1429
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1430
1143
avahi_strerror(avahi_server_errno(mc.server)));
1432
1145
goto end;
1433
1146
}
1434
1147
1435
if(quit_now){
1436
goto end;
1437
}
1438
1439
1148
/* Run the main loop */
1440
1149
1441
1150
if(debug){
1470
1179
gpgme_release(mc.ctx);
1471
1180
}
1472
1181
1473
/* Take down the network interface */
1474
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1476
if(ret == -1){
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
1484
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
1488
}
1489
}
1490
1491
1182
/* Removes the temp directory used by GPGME */
1492
1183
if(tempdir_created){
1493
1184
DIR *d;
1532
1223
}
1533
1224
}
1534
1225
1535
if(quit_now){
1536
sigemptyset(&old_sigterm_action.sa_mask);
1537
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1539
if(ret == -1){
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
1543
}
1544
1545
1226
return exitcode;
1546
1227
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0