To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 301
- compare with another revision
- download diff
- download tarball
- view history from revision 301
- Committer: Teddy Hogeborn
- Date: 2009-02-07 03:38:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207033817-aotdjeibhz3sa4lr
* plugin-runner.c (main): If debugging, print name of failed plugins.
- 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
getuid(), getgid(), seteuid(),
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
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
147
148
132
/*
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* 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,
151
135
* "buffer_length" is how much is already used.
152
136
*/
153
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
154
138
size_t buffer_capacity){
155
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
165
149
/*
166
150
* Initialize GPGME.
167
151
*/
168
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
169
153
const char *pubkey, const char *tempdir){
154
int ret;
170
155
gpgme_error_t rc;
171
156
gpgme_engine_info_t engine_info;
172
157
175
160
* Helper function to insert pub and seckey to the engine keyring.
176
161
*/
177
162
bool import_key(const char *filename){
178
int ret;
179
163
int fd;
180
164
gpgme_data_t pgp_data;
181
165
192
176
return false;
193
177
}
194
178
195
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
196
180
if(rc != GPG_ERR_NO_ERROR){
197
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
182
gpgme_strsource(rc), gpgme_strerror(rc));
208
192
}
209
193
210
194
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
212
196
}
213
197
214
198
/* Init GPGME */
241
225
}
242
226
243
227
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
245
229
if(rc != GPG_ERR_NO_ERROR){
246
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
231
gpgme_strsource(rc), gpgme_strerror(rc));
252
236
return false;
253
237
}
254
238
255
return true;
239
return true;
256
240
}
257
241
258
242
/*
259
243
* Decrypt OpenPGP data.
260
244
* Returns -1 on error
261
245
*/
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
263
248
size_t crypto_size,
264
249
char **plaintext){
265
250
gpgme_data_t dh_crypto, dh_plain;
292
277
293
278
/* Decrypt data from the cryptotext data buffer to the plaintext
294
279
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
281
if(rc != GPG_ERR_NO_ERROR){
297
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
283
gpgme_strsource(rc), gpgme_strerror(rc));
299
284
plaintext_length = -1;
300
285
if(debug){
301
286
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
303
288
if(result == NULL){
304
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
305
290
} else {
312
297
}
313
298
gpgme_recipient_t recipient;
314
299
recipient = result->recipients;
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;
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
}
323
310
}
324
311
}
325
312
}
339
326
340
327
*plaintext = NULL;
341
328
while(true){
342
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
343
330
(size_t)plaintext_length,
344
331
plaintext_capacity);
345
332
if(plaintext_capacity == 0){
346
perror("incbuffer");
333
perror("adjustbuffer");
347
334
plaintext_length = -1;
348
335
goto decrypt_end;
349
336
}
395
382
fprintf(stderr, "GnuTLS: %s", string);
396
383
}
397
384
398
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
399
387
const char *seckeyfilename){
400
388
int ret;
401
389
419
407
}
420
408
421
409
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
423
411
if(ret != GNUTLS_E_SUCCESS){
424
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
413
* from
414
* -Wunreachable-code
415
*/
428
416
safer_gnutls_strerror(ret));
429
417
gnutls_global_deinit();
430
418
return -1;
437
425
}
438
426
439
427
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
441
429
GNUTLS_OPENPGP_FMT_BASE64);
442
430
if(ret != GNUTLS_E_SUCCESS){
443
431
fprintf(stderr,
449
437
}
450
438
451
439
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
453
441
if(ret != GNUTLS_E_SUCCESS){
454
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
443
" %s\n", safer_gnutls_strerror(ret));
456
444
goto globalfail;
457
445
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
447
if(ret != GNUTLS_E_SUCCESS){
460
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
449
safer_gnutls_strerror(ret));
462
450
goto globalfail;
463
451
}
464
452
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
454
467
455
return 0;
468
456
469
457
globalfail:
470
458
471
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
472
460
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
474
462
return -1;
475
463
}
476
464
477
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
478
467
int ret;
479
468
/* GnuTLS session creation */
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);
469
ret = gnutls_init(session, GNUTLS_SERVER);
486
470
if(ret != GNUTLS_E_SUCCESS){
487
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
472
safer_gnutls_strerror(ret));
490
474
491
475
{
492
476
const char *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);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
500
478
if(ret != GNUTLS_E_SUCCESS){
501
479
fprintf(stderr, "Syntax error at: %s\n", err);
502
480
fprintf(stderr, "GnuTLS error: %s\n",
506
484
}
507
485
}
508
486
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);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
517
489
if(ret != GNUTLS_E_SUCCESS){
518
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
491
safer_gnutls_strerror(ret));
522
494
}
523
495
524
496
/* ignore client certificate if any. */
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
526
499
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
528
501
529
502
return 0;
530
503
}
536
509
/* Called when a Mandos server is found */
537
510
static int start_mandos_communication(const char *ip, uint16_t port,
538
511
AvahiIfIndex if_index,
539
int af){
540
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
541
514
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
546
516
char *buffer = NULL;
547
517
char *decrypted_buffer;
548
518
size_t buffer_length = 0;
549
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
550
521
size_t written;
551
522
int retval = 0;
523
char interface[IF_NAMESIZE];
552
524
gnutls_session_t session;
553
int pf; /* Protocol family */
554
555
if(quit_now){
556
return -1;
557
}
558
559
switch(af){
560
case AF_INET6:
561
pf = PF_INET6;
562
break;
563
case AF_INET:
564
pf = PF_INET;
565
break;
566
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
568
return -1;
569
}
570
571
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
572
527
if(ret != 0){
573
528
return -1;
574
529
}
575
530
576
531
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
578
533
"\n", ip, port);
579
534
}
580
535
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
582
537
if(tcp_sd < 0){
583
538
perror("socket");
584
retval = -1;
585
goto mandos_end;
539
return -1;
586
540
}
587
541
588
if(quit_now){
589
retval = -1;
590
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);
591
548
}
592
549
593
550
memset(&to, 0, sizeof(to));
594
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
600
}
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);
601
555
if(ret < 0 ){
602
556
perror("inet_pton");
603
retval = -1;
604
goto mandos_end;
557
return -1;
605
558
}
606
559
if(ret == 0){
607
560
fprintf(stderr, "Bad address: %s\n", ip);
608
retval = -1;
609
goto mandos_end;
561
return -1;
610
562
}
611
if(af == AF_INET6){
612
to.in6.sin6_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
615
616
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
617
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
618
-Wunreachable-code*/
619
if(if_index == AVAHI_IF_UNSPEC){
620
fprintf(stderr, "An IPv6 link-local address is incomplete"
621
" without a network interface\n");
622
retval = -1;
623
goto mandos_end;
624
}
625
/* Set the network interface number as scope */
626
to.in6.sin6_scope_id = (uint32_t)if_index;
627
}
628
} else {
629
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
564
-Wconversion and
631
565
-Wunreachable-code */
632
}
633
566
634
if(quit_now){
635
retval = -1;
636
goto mandos_end;
637
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
638
568
639
569
if(debug){
640
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
641
char interface[IF_NAMESIZE];
642
if(if_indextoname((unsigned int)if_index, interface) == NULL){
643
perror("if_indextoname");
644
} else {
645
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
646
ip, interface, port);
647
}
648
} else {
649
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
650
port);
651
}
652
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
653
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
654
const char *pcret;
655
if(af == AF_INET6){
656
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
657
sizeof(addrstr));
658
} else {
659
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
660
sizeof(addrstr));
661
}
662
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){
663
575
perror("inet_ntop");
664
576
} else {
665
577
if(strcmp(addrstr, ip) != 0){
668
580
}
669
581
}
670
582
671
if(quit_now){
672
retval = -1;
673
goto mandos_end;
674
}
675
676
if(af == AF_INET6){
677
ret = connect(tcp_sd, &to.in6, sizeof(to));
678
} else {
679
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
680
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
681
584
if(ret < 0){
682
585
perror("connect");
683
retval = -1;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
retval = -1;
689
goto mandos_end;
586
return -1;
690
587
}
691
588
692
589
const char *out = mandos_protocol_version;
711
608
break;
712
609
}
713
610
}
714
715
if(quit_now){
716
retval = -1;
717
goto mandos_end;
718
}
719
611
}
720
612
721
613
if(debug){
722
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
723
615
}
724
616
725
if(quit_now){
726
retval = -1;
727
goto mandos_end;
728
}
729
730
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
731
618
732
if(quit_now){
733
retval = -1;
734
goto mandos_end;
735
}
736
737
do {
619
do{
738
620
ret = gnutls_handshake(session);
739
if(quit_now){
740
retval = -1;
741
goto mandos_end;
742
}
743
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
744
622
745
623
if(ret != GNUTLS_E_SUCCESS){
754
632
/* Read OpenPGP packet that contains the wanted password */
755
633
756
634
if(debug){
757
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
758
636
ip);
759
637
}
760
638
761
639
while(true){
762
763
if(quit_now){
764
retval = -1;
765
goto mandos_end;
766
}
767
768
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
769
641
buffer_capacity);
770
642
if(buffer_capacity == 0){
771
perror("incbuffer");
772
retval = -1;
773
goto mandos_end;
774
}
775
776
if(quit_now){
643
perror("adjustbuffer");
777
644
retval = -1;
778
645
goto mandos_end;
779
646
}
789
656
case GNUTLS_E_AGAIN:
790
657
break;
791
658
case GNUTLS_E_REHANDSHAKE:
792
do {
659
do{
793
660
ret = gnutls_handshake(session);
794
795
if(quit_now){
796
retval = -1;
797
goto mandos_end;
798
}
799
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
800
662
if(ret < 0){
801
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
820
682
fprintf(stderr, "Closing TLS session\n");
821
683
}
822
684
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);
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
835
686
836
687
if(buffer_length > 0){
837
ssize_t decrypted_buffer_size;
838
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
839
689
buffer_length,
840
690
&decrypted_buffer);
841
691
if(decrypted_buffer_size >= 0){
842
843
692
written = 0;
844
693
while(written < (size_t) decrypted_buffer_size){
845
if(quit_now){
846
retval = -1;
847
goto mandos_end;
848
}
849
850
694
ret = (int)fwrite(decrypted_buffer + written, 1,
851
695
(size_t)decrypted_buffer_size - written,
852
696
stdout);
872
716
873
717
mandos_end:
874
718
free(buffer);
875
if(tcp_sd >= 0){
876
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
877
}
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
878
720
if(ret == -1){
879
721
perror("close");
880
722
}
881
723
gnutls_deinit(session);
882
if(quit_now){
883
retval = -1;
884
}
885
724
return retval;
886
725
}
887
726
888
727
static void resolve_callback(AvahiSServiceResolver *r,
889
728
AvahiIfIndex interface,
890
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
891
730
AvahiResolverEvent event,
892
731
const char *name,
893
732
const char *type,
898
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
899
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
900
739
flags,
901
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
902
742
assert(r);
903
743
904
744
/* Called whenever a service has been resolved successfully or
905
745
timed out */
906
746
907
if(quit_now){
908
return;
909
}
910
911
747
switch(event){
912
748
default:
913
749
case AVAHI_RESOLVER_FAILURE:
914
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
915
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
916
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
917
753
break;
918
754
919
755
case AVAHI_RESOLVER_FOUND:
925
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
926
762
ip, (intmax_t)interface, port);
927
763
}
928
int ret = start_mandos_communication(ip, port, interface,
929
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
930
765
if(ret == 0){
931
avahi_simple_poll_quit(mc.simple_poll);
766
avahi_simple_poll_quit(mc->simple_poll);
932
767
}
933
768
}
934
769
}
944
779
const char *domain,
945
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
946
781
flags,
947
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
948
784
assert(b);
949
785
950
786
/* Called whenever a new services becomes available on the LAN or
951
787
is removed from the LAN */
952
788
953
if(quit_now){
954
return;
955
}
956
957
789
switch(event){
958
790
default:
959
791
case AVAHI_BROWSER_FAILURE:
960
792
961
793
fprintf(stderr, "(Avahi browser) %s\n",
962
avahi_strerror(avahi_server_errno(mc.server)));
963
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
964
796
return;
965
797
966
798
case AVAHI_BROWSER_NEW:
969
801
the callback function is called the Avahi server will free the
970
802
resolver for us. */
971
803
972
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
973
name, type, domain, protocol, 0,
974
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)))
975
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
976
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
977
810
break;
978
811
979
812
case AVAHI_BROWSER_REMOVE:
988
821
}
989
822
}
990
823
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
1005
824
int main(int argc, char *argv[]){
1006
825
AvahiSServiceBrowser *sb = NULL;
1007
826
int error;
1008
827
int ret;
1009
828
intmax_t tmpmax;
1010
char *tmp;
829
int numchars;
1011
830
int exitcode = EXIT_SUCCESS;
1012
831
const char *interface = "eth0";
1013
832
struct ifreq network;
1014
int sd = -1;
1015
bool take_down_interface = false;
833
int sd;
1016
834
uid_t uid;
1017
835
gid_t gid;
1018
836
char *connect_to = NULL;
1022
840
const char *seckey = PATHDIR "/" SECKEY;
1023
841
const char *pubkey = PATHDIR "/" PUBKEY;
1024
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1025
846
bool gnutls_initialized = false;
1026
847
bool gpgme_initialized = false;
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
}
848
double delay = 2.5;
1052
849
1053
850
{
1054
851
struct argp_option options[] = {
1060
857
.group = 1 },
1061
858
{ .name = "interface", .key = 'i',
1062
859
.arg = "NAME",
1063
.doc = "Network interface that will be used to search for"
1064
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1065
862
.group = 1 },
1066
863
{ .name = "seckey", .key = 's',
1067
864
.arg = "FILE",
1106
903
pubkey = arg;
1107
904
break;
1108
905
case 129: /* --dh-bits */
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){
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
1113
909
fprintf(stderr, "Bad number of DH bits\n");
1114
910
exit(EXIT_FAILURE);
1115
911
}
1119
915
mc.priority = arg;
1120
916
break;
1121
917
case 131: /* --delay */
1122
errno = 0;
1123
delay = strtof(arg, &tmp);
1124
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'){
1125
920
fprintf(stderr, "Bad delay\n");
1126
921
exit(EXIT_FAILURE);
1127
922
}
1148
943
}
1149
944
}
1150
945
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
1229
946
/* If the interface is down, bring it up */
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
947
{
1249
948
#ifdef __linux__
1250
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
950
messages to mess up the prompt */
1252
951
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1254
952
if(ret == -1){
1255
restore_loglevel = false;
1256
953
perror("klogctl");
1257
954
}
1258
#endif /* __linux__ */
955
#endif
1259
956
1260
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
958
if(sd < 0){
1262
959
perror("socket");
1263
960
exitcode = EXIT_FAILURE;
1264
961
#ifdef __linux__
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1267
if(ret == -1){
1268
perror("klogctl");
1269
}
1270
}
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1275
963
if(ret == -1){
1276
perror("seteuid");
964
perror("klogctl");
1277
965
}
966
#endif
1278
967
goto end;
1279
968
}
1280
969
strcpy(network.ifr_name, interface);
1282
971
if(ret == -1){
1283
972
perror("ioctl SIOCGIFFLAGS");
1284
973
#ifdef __linux__
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1287
if(ret == -1){
1288
perror("klogctl");
1289
}
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
1290
977
}
1291
#endif /* __linux__ */
978
#endif
1292
979
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1299
980
goto end;
1300
981
}
1301
982
if((network.ifr_flags & IFF_UP) == 0){
1302
983
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
985
if(ret == -1){
1306
take_down_interface = false;
1307
986
perror("ioctl SIOCSIFFLAGS");
1308
987
exitcode = EXIT_FAILURE;
1309
988
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1320
990
if(ret == -1){
1321
perror("seteuid");
991
perror("klogctl");
1322
992
}
993
#endif
1323
994
goto end;
1324
995
}
1325
996
}
1337
1008
perror("nanosleep");
1338
1009
}
1339
1010
}
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
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1346
1014
}
1347
1015
#ifdef __linux__
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1351
if(ret == -1){
1352
perror("klogctl");
1353
}
1354
}
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);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1378
1038
if(ret == -1){
1379
1039
fprintf(stderr, "init_gnutls_global failed\n");
1380
1040
exitcode = EXIT_FAILURE;
1383
1043
gnutls_initialized = true;
1384
1044
}
1385
1045
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1391
1046
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
1047
perror("mkdtemp");
1394
1048
goto end;
1395
1049
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1402
1053
fprintf(stderr, "init_gpgme failed\n");
1403
1054
exitcode = EXIT_FAILURE;
1404
1055
goto end;
1406
1057
gpgme_initialized = true;
1407
1058
}
1408
1059
1409
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;
1410
1064
goto end;
1411
1065
}
1412
1066
1419
1073
exitcode = EXIT_FAILURE;
1420
1074
goto end;
1421
1075
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1427
1076
uint16_t port;
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){
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1432
1080
fprintf(stderr, "Bad port number\n");
1433
1081
exitcode = EXIT_FAILURE;
1434
1082
goto end;
1435
1083
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1441
1084
port = (uint16_t)tmpmax;
1442
1085
*address = '\0';
1443
1086
address = connect_to;
1444
/* Colon in address indicates IPv6 */
1445
int af;
1446
if(strchr(address, ':') != NULL){
1447
af = AF_INET6;
1448
} else {
1449
af = AF_INET;
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1457
1088
if(ret < 0){
1458
1089
exitcode = EXIT_FAILURE;
1459
1090
} else {
1462
1093
goto end;
1463
1094
}
1464
1095
1465
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;
1466
1108
goto end;
1467
1109
}
1468
1110
1492
1134
goto end;
1493
1135
}
1494
1136
1495
if(quit_now){
1496
goto end;
1497
}
1498
1499
1137
/* Create the Avahi service browser */
1500
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1503
1141
if(sb == NULL){
1504
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1505
1143
avahi_strerror(avahi_server_errno(mc.server)));
1507
1145
goto end;
1508
1146
}
1509
1147
1510
if(quit_now){
1511
goto end;
1512
}
1513
1514
1148
/* Run the main loop */
1515
1149
1516
1150
if(debug){
1545
1179
gpgme_release(mc.ctx);
1546
1180
}
1547
1181
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
1580
1182
/* Removes the temp directory used by GPGME */
1581
1183
if(tempdir_created){
1582
1184
DIR *d;
1621
1223
}
1622
1224
}
1623
1225
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
1634
1226
return exitcode;
1635
1227
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0