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- Committer: Teddy Hogeborn
- Date: 2009-02-07 04:50:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
- 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){
154
int ret;
167
155
gpgme_error_t rc;
168
156
gpgme_engine_info_t engine_info;
169
157
172
160
* Helper function to insert pub and seckey to the engine keyring.
173
161
*/
174
162
bool import_key(const char *filename){
175
int ret;
176
163
int fd;
177
164
gpgme_data_t pgp_data;
178
165
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;
533
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
534
521
size_t written;
535
522
int retval = 0;
523
char interface[IF_NAMESIZE];
536
524
gnutls_session_t session;
537
int pf; /* Protocol family */
538
539
if(quit_now){
540
return -1;
541
}
542
543
switch(af){
544
case AF_INET6:
545
pf = PF_INET6;
546
break;
547
case AF_INET:
548
pf = PF_INET;
549
break;
550
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
552
return -1;
553
}
554
555
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
556
527
if(ret != 0){
557
528
return -1;
558
529
}
559
530
560
531
if(debug){
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
562
533
"\n", ip, port);
563
534
}
564
535
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
566
537
if(tcp_sd < 0){
567
538
perror("socket");
568
retval = -1;
569
goto mandos_end;
539
return -1;
570
540
}
571
541
572
if(quit_now){
573
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);
574
548
}
575
549
576
550
memset(&to, 0, sizeof(to));
577
if(af == AF_INET6){
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
580
} else { /* IPv4 */
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
583
}
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);
584
555
if(ret < 0 ){
585
556
perror("inet_pton");
586
retval = -1;
587
goto mandos_end;
557
return -1;
588
558
}
589
559
if(ret == 0){
590
560
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
592
goto mandos_end;
561
return -1;
593
562
}
594
if(af == AF_INET6){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
602
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
606
goto mandos_end;
607
}
608
/* Set the network interface number as scope */
609
to.in6.sin6_scope_id = (uint32_t)if_index;
610
}
611
} else {
612
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
613
564
-Wconversion and
614
565
-Wunreachable-code */
615
}
616
566
617
if(quit_now){
618
goto mandos_end;
619
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
620
568
621
569
if(debug){
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
char interface[IF_NAMESIZE];
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
626
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
629
}
630
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
633
}
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
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){
645
575
perror("inet_ntop");
646
576
} else {
647
577
if(strcmp(addrstr, ip) != 0){
650
580
}
651
581
}
652
582
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
662
584
if(ret < 0){
663
585
perror("connect");
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
586
return -1;
670
587
}
671
588
672
589
const char *out = mandos_protocol_version;
691
608
break;
692
609
}
693
610
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
698
611
}
699
612
700
613
if(debug){
701
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
702
615
}
703
616
704
if(quit_now){
705
goto mandos_end;
706
}
707
708
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
618
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
619
do{
715
620
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
719
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
622
721
623
if(ret != GNUTLS_E_SUCCESS){
730
632
/* Read OpenPGP packet that contains the wanted password */
731
633
732
634
if(debug){
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
734
636
ip);
735
637
}
736
638
737
639
while(true){
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
744
641
buffer_capacity);
745
642
if(buffer_capacity == 0){
746
perror("incbuffer");
643
perror("adjustbuffer");
747
644
retval = -1;
748
645
goto mandos_end;
749
646
}
750
647
751
if(quit_now){
752
goto mandos_end;
753
}
754
755
648
sret = gnutls_record_recv(session, buffer+buffer_length,
756
649
BUFFER_SIZE);
757
650
if(sret == 0){
763
656
case GNUTLS_E_AGAIN:
764
657
break;
765
658
case GNUTLS_E_REHANDSHAKE:
766
do {
659
do{
767
660
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
772
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
773
662
if(ret < 0){
774
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
793
682
fprintf(stderr, "Closing TLS session\n");
794
683
}
795
684
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
686
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
687
if(buffer_length > 0){
807
ssize_t decrypted_buffer_size;
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
813
692
written = 0;
814
693
while(written < (size_t) decrypted_buffer_size){
815
if(quit_now){
816
goto mandos_end;
817
}
818
819
694
ret = (int)fwrite(decrypted_buffer + written, 1,
820
695
(size_t)decrypted_buffer_size - written,
821
696
stdout);
841
716
842
717
mandos_end:
843
718
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
847
720
if(ret == -1){
848
721
perror("close");
849
722
}
850
723
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
854
724
return retval;
855
725
}
856
726
857
727
static void resolve_callback(AvahiSServiceResolver *r,
858
728
AvahiIfIndex interface,
859
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
860
730
AvahiResolverEvent event,
861
731
const char *name,
862
732
const char *type,
867
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
868
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
869
739
flags,
870
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
871
742
assert(r);
872
743
873
744
/* Called whenever a service has been resolved successfully or
874
745
timed out */
875
746
876
if(quit_now){
877
return;
878
}
879
880
747
switch(event){
881
748
default:
882
749
case AVAHI_RESOLVER_FAILURE:
883
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
886
753
break;
887
754
888
755
case AVAHI_RESOLVER_FOUND:
894
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
762
ip, (intmax_t)interface, port);
896
763
}
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
899
765
if(ret == 0){
900
avahi_simple_poll_quit(mc.simple_poll);
766
avahi_simple_poll_quit(mc->simple_poll);
901
767
}
902
768
}
903
769
}
913
779
const char *domain,
914
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
915
781
flags,
916
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
917
784
assert(b);
918
785
919
786
/* Called whenever a new services becomes available on the LAN or
920
787
is removed from the LAN */
921
788
922
if(quit_now){
923
return;
924
}
925
926
789
switch(event){
927
790
default:
928
791
case AVAHI_BROWSER_FAILURE:
929
792
930
793
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
933
796
return;
934
797
935
798
case AVAHI_BROWSER_NEW:
938
801
the callback function is called the Avahi server will free the
939
802
resolver for us. */
940
803
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
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)))
944
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
946
810
break;
947
811
948
812
case AVAHI_BROWSER_REMOVE:
957
821
}
958
822
}
959
823
960
/* stop main loop after sigterm has been called */
961
static void handle_sigterm(int sig){
962
if(quit_now){
963
return;
964
}
965
quit_now = 1;
966
signal_received = sig;
967
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
972
}
973
974
824
int main(int argc, char *argv[]){
975
825
AvahiSServiceBrowser *sb = NULL;
976
826
int error;
977
827
int ret;
978
828
intmax_t tmpmax;
979
char *tmp;
829
int numchars;
980
830
int exitcode = EXIT_SUCCESS;
981
831
const char *interface = "eth0";
982
832
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
833
int sd;
985
834
uid_t uid;
986
835
gid_t gid;
987
836
char *connect_to = NULL;
991
840
const char *seckey = PATHDIR "/" SECKEY;
992
841
const char *pubkey = PATHDIR "/" PUBKEY;
993
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
994
846
bool gnutls_initialized = false;
995
847
bool gpgme_initialized = false;
996
float delay = 2.5f;
997
998
struct sigaction old_sigterm_action;
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
848
double delay = 2.5;
1000
849
1001
850
{
1002
851
struct argp_option options[] = {
1008
857
.group = 1 },
1009
858
{ .name = "interface", .key = 'i',
1010
859
.arg = "NAME",
1011
.doc = "Network interface that will be used to search for"
1012
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1013
862
.group = 1 },
1014
863
{ .name = "seckey", .key = 's',
1015
864
.arg = "FILE",
1054
903
pubkey = arg;
1055
904
break;
1056
905
case 129: /* --dh-bits */
1057
errno = 0;
1058
tmpmax = strtoimax(arg, &tmp, 10);
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
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'){
1061
909
fprintf(stderr, "Bad number of DH bits\n");
1062
910
exit(EXIT_FAILURE);
1063
911
}
1067
915
mc.priority = arg;
1068
916
break;
1069
917
case 131: /* --delay */
1070
errno = 0;
1071
delay = strtof(arg, &tmp);
1072
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'){
1073
920
fprintf(stderr, "Bad delay\n");
1074
921
exit(EXIT_FAILURE);
1075
922
}
1096
943
}
1097
944
}
1098
945
1099
if(not debug){
1100
avahi_set_log_function(empty_log);
1101
}
1102
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
from the signal handler */
1105
/* Initialize the pseudo-RNG for Avahi */
1106
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
}
1113
1114
sigemptyset(&sigterm_action.sa_mask);
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1131
goto end;
1132
}
1133
/* Need to check if the handler is SIG_IGN before handling:
1134
| [[info:libc:Initial Signal Actions]] |
1135
| [[info:libc:Basic Signal Handling]] |
1136
*/
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1141
}
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1154
}
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1160
goto end;
1161
}
1162
}
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
946
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
947
{
1190
948
#ifdef __linux__
1191
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
950
messages to mess up the prompt */
1193
951
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
952
if(ret == -1){
1196
restore_loglevel = false;
1197
953
perror("klogctl");
1198
954
}
1199
#endif /* __linux__ */
955
#endif
1200
956
1201
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
958
if(sd < 0){
1203
959
perror("socket");
1204
960
exitcode = EXIT_FAILURE;
1205
961
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
962
ret = klogctl(7, NULL, 0);
963
if(ret == -1){
964
perror("klogctl");
1211
965
}
1212
#endif /* __linux__ */
966
#endif
1213
967
goto end;
1214
968
}
1215
969
strcpy(network.ifr_name, interface);
1217
971
if(ret == -1){
1218
972
perror("ioctl SIOCGIFFLAGS");
1219
973
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
1225
977
}
1226
#endif /* __linux__ */
978
#endif
1227
979
exitcode = EXIT_FAILURE;
1228
980
goto end;
1229
981
}
1230
982
if((network.ifr_flags & IFF_UP) == 0){
1231
983
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
985
if(ret == -1){
1235
take_down_interface = false;
1236
986
perror("ioctl SIOCSIFFLAGS");
1237
987
exitcode = EXIT_FAILURE;
1238
988
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
989
ret = klogctl(7, NULL, 0);
990
if(ret == -1){
991
perror("klogctl");
1244
992
}
1245
#endif /* __linux__ */
993
#endif
1246
994
goto end;
1247
995
}
1248
996
}
1260
1008
perror("nanosleep");
1261
1009
}
1262
1010
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1269
1014
}
1270
1015
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1277
1020
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1021
#endif
1283
1022
}
1284
1023
1285
1024
uid = getuid();
1286
1025
gid = getgid();
1287
1026
1288
errno = 0;
1289
1027
setgid(gid);
1290
1028
if(ret == -1){
1291
1029
perror("setgid");
1296
1034
perror("setuid");
1297
1035
}
1298
1036
1299
if(quit_now){
1300
goto end;
1301
}
1302
1303
ret = init_gnutls_global(pubkey, seckey);
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1304
1038
if(ret == -1){
1305
1039
fprintf(stderr, "init_gnutls_global failed\n");
1306
1040
exitcode = EXIT_FAILURE;
1309
1043
gnutls_initialized = true;
1310
1044
}
1311
1045
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
tempdir_created = true;
1317
1046
if(mkdtemp(tempdir) == NULL){
1318
tempdir_created = false;
1319
1047
perror("mkdtemp");
1320
1048
goto end;
1321
1049
}
1322
1323
if(quit_now){
1324
goto end;
1325
}
1326
1327
if(not init_gpgme(pubkey, seckey, tempdir)){
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1328
1053
fprintf(stderr, "init_gpgme failed\n");
1329
1054
exitcode = EXIT_FAILURE;
1330
1055
goto end;
1332
1057
gpgme_initialized = true;
1333
1058
}
1334
1059
1335
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;
1336
1064
goto end;
1337
1065
}
1338
1066
1345
1073
exitcode = EXIT_FAILURE;
1346
1074
goto end;
1347
1075
}
1348
1349
if(quit_now){
1350
goto end;
1351
}
1352
1353
1076
uint16_t port;
1354
errno = 0;
1355
tmpmax = strtoimax(address+1, &tmp, 10);
1356
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1357
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'){
1358
1080
fprintf(stderr, "Bad port number\n");
1359
1081
exitcode = EXIT_FAILURE;
1360
1082
goto end;
1361
1083
}
1362
1363
if(quit_now){
1364
goto end;
1365
}
1366
1367
1084
port = (uint16_t)tmpmax;
1368
1085
*address = '\0';
1369
1086
address = connect_to;
1370
/* Colon in address indicates IPv6 */
1371
int af;
1372
if(strchr(address, ':') != NULL){
1373
af = AF_INET6;
1374
} else {
1375
af = AF_INET;
1376
}
1377
1378
if(quit_now){
1379
goto end;
1380
}
1381
1382
ret = start_mandos_communication(address, port, if_index, af);
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1383
1088
if(ret < 0){
1384
1089
exitcode = EXIT_FAILURE;
1385
1090
} else {
1388
1093
goto end;
1389
1094
}
1390
1095
1391
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;
1392
1108
goto end;
1393
1109
}
1394
1110
1418
1134
goto end;
1419
1135
}
1420
1136
1421
if(quit_now){
1422
goto end;
1423
}
1424
1425
1137
/* Create the Avahi service browser */
1426
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1427
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1428
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1429
1141
if(sb == NULL){
1430
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1431
1143
avahi_strerror(avahi_server_errno(mc.server)));
1433
1145
goto end;
1434
1146
}
1435
1147
1436
if(quit_now){
1437
goto end;
1438
}
1439
1440
1148
/* Run the main loop */
1441
1149
1442
1150
if(debug){
1471
1179
gpgme_release(mc.ctx);
1472
1180
}
1473
1181
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1477
if(ret == -1){
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
if(ret == -1){
1483
perror("ioctl SIOCSIFFLAGS");
1484
}
1485
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
1489
}
1490
}
1491
1492
1182
/* Removes the temp directory used by GPGME */
1493
1183
if(tempdir_created){
1494
1184
DIR *d;
1533
1223
}
1534
1224
}
1535
1225
1536
if(quit_now){
1537
sigemptyset(&old_sigterm_action.sa_mask);
1538
old_sigterm_action.sa_handler = SIG_DFL;
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1540
if(ret == -1){
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
1544
}
1545
1546
1226
return exitcode;
1547
1227
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0