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- Committer: Teddy Hogeborn
- Date: 2009-01-18 00:18:50 UTC
- Revision ID: teddy@fukt.bsnet.se-20090118001850-pvg8xjwmbyt23fom
* debian/rules (install-indep): Removed "--no-start" from
dh_installinit.
dh_installinit.
- 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 */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
43
srand() */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
56
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
55
struct in6_addr, inet_pton(),
56
connect() */
59
57
#include <fcntl.h> /* open() */
60
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
59
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
61
#include <assert.h> /* assert() */
65
62
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
63
#include <time.h> /* time() */
67
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
65
SIOCSIFFLAGS, if_indextoname(),
69
66
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
67
#include <netinet/in.h>
73
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
69
getuid(), getgid(), setuid(),
75
70
setgid() */
76
71
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
72
#include <iso646.h> /* not, and, or */
78
73
#include <argp.h> /* struct argp_option, error_t, struct
79
74
argp_state, struct argp,
80
75
argp_parse(), ARGP_KEY_ARG,
81
76
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
77
90
78
/* Avahi */
91
79
/* All Avahi types, constants and functions
137
125
gpgme_ctx_t ctx;
138
126
} mandos_context;
139
127
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
128
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
148
131
* "buffer_length" is how much is already used.
149
132
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
134
size_t buffer_capacity){
152
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
162
145
/*
163
146
* Initialize GPGME.
164
147
*/
165
static bool init_gpgme(const char *seckey,
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
149
const char *pubkey, const char *tempdir){
150
int ret;
167
151
gpgme_error_t rc;
168
152
gpgme_engine_info_t engine_info;
169
153
170
154
171
155
/*
172
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
173
157
*/
174
158
bool import_key(const char *filename){
175
int ret;
176
159
int fd;
177
160
gpgme_data_t pgp_data;
178
161
189
172
return false;
190
173
}
191
174
192
rc = gpgme_op_import(mc.ctx, pgp_data);
175
rc = gpgme_op_import(mc->ctx, pgp_data);
193
176
if(rc != GPG_ERR_NO_ERROR){
194
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
178
gpgme_strsource(rc), gpgme_strerror(rc));
205
188
}
206
189
207
190
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
191
fprintf(stderr, "Initialize gpgme\n");
209
192
}
210
193
211
194
/* Init GPGME */
238
221
}
239
222
240
223
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
224
rc = gpgme_new(&(mc->ctx));
242
225
if(rc != GPG_ERR_NO_ERROR){
243
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
227
gpgme_strsource(rc), gpgme_strerror(rc));
249
232
return false;
250
233
}
251
234
252
return true;
235
return true;
253
236
}
254
237
255
238
/*
256
239
* Decrypt OpenPGP data.
257
240
* Returns -1 on error
258
241
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
260
244
size_t crypto_size,
261
245
char **plaintext){
262
246
gpgme_data_t dh_crypto, dh_plain;
289
273
290
274
/* Decrypt data from the cryptotext data buffer to the plaintext
291
275
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
277
if(rc != GPG_ERR_NO_ERROR){
294
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
279
gpgme_strsource(rc), gpgme_strerror(rc));
296
280
plaintext_length = -1;
297
281
if(debug){
298
282
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
283
result = gpgme_op_decrypt_result(mc->ctx);
300
284
if(result == NULL){
301
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
286
} else {
309
293
}
310
294
gpgme_recipient_t recipient;
311
295
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;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
320
306
}
321
307
}
322
308
}
336
322
337
323
*plaintext = NULL;
338
324
while(true){
339
plaintext_capacity = incbuffer(plaintext,
325
plaintext_capacity = adjustbuffer(plaintext,
340
326
(size_t)plaintext_length,
341
327
plaintext_capacity);
342
328
if(plaintext_capacity == 0){
343
perror("incbuffer");
329
perror("adjustbuffer");
344
330
plaintext_length = -1;
345
331
goto decrypt_end;
346
332
}
378
364
return plaintext_length;
379
365
}
380
366
381
static const char * safer_gnutls_strerror(int value){
367
static const char * safer_gnutls_strerror(int value) {
382
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
369
-Wunreachable-code */
384
370
if(ret == NULL)
392
378
fprintf(stderr, "GnuTLS: %s", string);
393
379
}
394
380
395
static int init_gnutls_global(const char *pubkeyfilename,
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
396
383
const char *seckeyfilename){
397
384
int ret;
398
385
401
388
}
402
389
403
390
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
391
if(ret != GNUTLS_E_SUCCESS) {
405
392
fprintf(stderr, "GnuTLS global_init: %s\n",
406
393
safer_gnutls_strerror(ret));
407
394
return -1;
416
403
}
417
404
418
405
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
406
gnutls_certificate_allocate_credentials(&mc->cred);
420
407
if(ret != GNUTLS_E_SUCCESS){
421
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
409
* from
410
* -Wunreachable-code
411
*/
425
412
safer_gnutls_strerror(ret));
426
413
gnutls_global_deinit();
427
414
return -1;
434
421
}
435
422
436
423
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
424
(mc->cred, pubkeyfilename, seckeyfilename,
438
425
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
426
if(ret != GNUTLS_E_SUCCESS) {
440
427
fprintf(stderr,
441
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
433
}
447
434
448
435
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
436
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
451
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
439
" %s\n", safer_gnutls_strerror(ret));
453
440
goto globalfail;
454
441
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
457
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
445
safer_gnutls_strerror(ret));
459
446
goto globalfail;
460
447
}
461
448
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
450
464
451
return 0;
465
452
466
453
globalfail:
467
454
468
gnutls_certificate_free_credentials(mc.cred);
455
gnutls_certificate_free_credentials(mc->cred);
469
456
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
457
gnutls_dh_params_deinit(mc->dh_params);
471
458
return -1;
472
459
}
473
460
474
static int init_gnutls_session(gnutls_session_t *session){
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
475
463
int ret;
476
464
/* GnuTLS session creation */
477
do {
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
465
ret = gnutls_init(session, GNUTLS_SERVER);
480
466
if(ret != GNUTLS_E_SUCCESS){
481
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
468
safer_gnutls_strerror(ret));
484
470
485
471
{
486
472
const char *err;
487
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
491
475
fprintf(stderr, "Syntax error at: %s\n", err);
492
476
fprintf(stderr, "GnuTLS error: %s\n",
493
477
safer_gnutls_strerror(ret));
496
480
}
497
481
}
498
482
499
do {
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
if(ret != GNUTLS_E_SUCCESS){
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
504
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
487
safer_gnutls_strerror(ret));
506
488
gnutls_deinit(*session);
508
490
}
509
491
510
492
/* ignore client certificate if any. */
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
512
495
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
514
497
515
498
return 0;
516
499
}
519
502
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
503
__attribute__((unused)) const char *txt){}
521
504
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
505
/* Called when a Mandos server is found */
526
506
static int start_mandos_communication(const char *ip, uint16_t port,
527
507
AvahiIfIndex if_index,
528
int af){
529
int ret, tcp_sd = -1;
508
mandos_context *mc){
509
int ret, tcp_sd;
530
510
ssize_t sret;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
535
512
char *buffer = NULL;
536
513
char *decrypted_buffer;
537
514
size_t buffer_length = 0;
538
515
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
539
517
size_t written;
540
518
int retval = 0;
519
char interface[IF_NAMESIZE];
541
520
gnutls_session_t session;
542
int pf; /* Protocol family */
543
544
if(quit_now){
545
return -1;
546
}
547
548
switch(af){
549
case AF_INET6:
550
pf = PF_INET6;
551
break;
552
case AF_INET:
553
pf = PF_INET;
554
break;
555
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
557
return -1;
558
}
559
560
ret = init_gnutls_session(&session);
521
522
ret = init_gnutls_session(mc, &session);
561
523
if(ret != 0){
562
524
return -1;
563
525
}
564
526
565
527
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
567
529
"\n", ip, port);
568
530
}
569
531
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
if(tcp_sd < 0){
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
572
534
perror("socket");
573
retval = -1;
574
goto mandos_end;
535
return -1;
575
536
}
576
537
577
if(quit_now){
578
goto mandos_end;
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
579
544
}
580
545
581
546
memset(&to, 0, sizeof(to));
582
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
585
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
588
}
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
589
551
if(ret < 0 ){
590
552
perror("inet_pton");
591
retval = -1;
592
goto mandos_end;
553
return -1;
593
554
}
594
555
if(ret == 0){
595
556
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
597
goto mandos_end;
557
return -1;
598
558
}
599
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
611
goto mandos_end;
612
}
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
615
}
616
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
618
560
-Wconversion and
619
561
-Wunreachable-code */
620
}
621
562
622
if(quit_now){
623
goto mandos_end;
624
}
563
to.in6.sin6_scope_id = (uint32_t)if_index;
625
564
626
565
if(debug){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
631
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
634
}
635
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
638
}
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
650
571
perror("inet_ntop");
651
572
} else {
652
573
if(strcmp(addrstr, ip) != 0){
655
576
}
656
577
}
657
578
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
579
ret = connect(tcp_sd, &to.in, sizeof(to));
667
580
if(ret < 0){
668
581
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
582
return -1;
675
583
}
676
584
677
585
const char *out = mandos_protocol_version;
696
604
break;
697
605
}
698
606
}
699
700
if(quit_now){
701
goto mandos_end;
702
}
703
607
}
704
608
705
609
if(debug){
706
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
707
611
}
708
612
709
if(quit_now){
710
goto mandos_end;
711
}
712
713
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
714
614
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
do {
615
do{
720
616
ret = gnutls_handshake(session);
721
if(quit_now){
722
goto mandos_end;
723
}
724
617
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
618
726
619
if(ret != GNUTLS_E_SUCCESS){
735
628
/* Read OpenPGP packet that contains the wanted password */
736
629
737
630
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
739
632
ip);
740
633
}
741
634
742
635
while(true){
743
744
if(quit_now){
745
goto mandos_end;
746
}
747
748
buffer_capacity = incbuffer(&buffer, buffer_length,
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
637
buffer_capacity);
750
638
if(buffer_capacity == 0){
751
perror("incbuffer");
639
perror("adjustbuffer");
752
640
retval = -1;
753
641
goto mandos_end;
754
642
}
755
643
756
if(quit_now){
757
goto mandos_end;
758
}
759
760
644
sret = gnutls_record_recv(session, buffer+buffer_length,
761
645
BUFFER_SIZE);
762
646
if(sret == 0){
768
652
case GNUTLS_E_AGAIN:
769
653
break;
770
654
case GNUTLS_E_REHANDSHAKE:
771
do {
655
do{
772
656
ret = gnutls_handshake(session);
773
774
if(quit_now){
775
goto mandos_end;
776
}
777
657
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
658
if(ret < 0){
779
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
798
678
fprintf(stderr, "Closing TLS session\n");
799
679
}
800
680
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
682
807
if(quit_now){
808
goto mandos_end;
809
}
810
811
683
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
814
685
buffer_length,
815
686
&decrypted_buffer);
816
687
if(decrypted_buffer_size >= 0){
817
818
688
written = 0;
819
689
while(written < (size_t) decrypted_buffer_size){
820
if(quit_now){
821
goto mandos_end;
822
}
823
824
690
ret = (int)fwrite(decrypted_buffer + written, 1,
825
691
(size_t)decrypted_buffer_size - written,
826
692
stdout);
846
712
847
713
mandos_end:
848
714
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
852
716
if(ret == -1){
853
717
perror("close");
854
718
}
855
719
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
859
720
return retval;
860
721
}
861
722
862
723
static void resolve_callback(AvahiSServiceResolver *r,
863
724
AvahiIfIndex interface,
864
AvahiProtocol proto,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
865
726
AvahiResolverEvent event,
866
727
const char *name,
867
728
const char *type,
872
733
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
734
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
735
flags,
875
AVAHI_GCC_UNUSED void* userdata){
736
void* userdata) {
737
mandos_context *mc = userdata;
876
738
assert(r);
877
739
878
740
/* Called whenever a service has been resolved successfully or
879
741
timed out */
880
742
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
743
switch(event) {
886
744
default:
887
745
case AVAHI_RESOLVER_FAILURE:
888
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
747
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
748
avahi_strerror(avahi_server_errno(mc->server)));
891
749
break;
892
750
893
751
case AVAHI_RESOLVER_FOUND:
899
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
758
ip, (intmax_t)interface, port);
901
759
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
760
int ret = start_mandos_communication(ip, port, interface, mc);
904
761
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
762
avahi_simple_poll_quit(mc->simple_poll);
906
763
}
907
764
}
908
765
}
909
766
avahi_s_service_resolver_free(r);
910
767
}
911
768
912
static void browse_callback(AvahiSServiceBrowser *b,
913
AvahiIfIndex interface,
914
AvahiProtocol protocol,
915
AvahiBrowserEvent event,
916
const char *name,
917
const char *type,
918
const char *domain,
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
flags,
921
AVAHI_GCC_UNUSED void* userdata){
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
922
780
assert(b);
923
781
924
782
/* Called whenever a new services becomes available on the LAN or
925
783
is removed from the LAN */
926
784
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
785
switch(event) {
932
786
default:
933
787
case AVAHI_BROWSER_FAILURE:
934
788
935
789
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
938
792
return;
939
793
940
794
case AVAHI_BROWSER_NEW:
943
797
the callback function is called the Avahi server will free the
944
798
resolver for us. */
945
799
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
949
804
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
805
name, avahi_strerror(avahi_server_errno(mc->server)));
951
806
break;
952
807
953
808
case AVAHI_BROWSER_REMOVE:
962
817
}
963
818
}
964
819
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
977
}
978
979
820
int main(int argc, char *argv[]){
980
AvahiSServiceBrowser *sb = NULL;
981
int error;
982
int ret;
983
intmax_t tmpmax;
984
char *tmp;
985
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
const char *seckey = PATHDIR "/" SECKEY;
997
const char *pubkey = PATHDIR "/" PUBKEY;
998
999
bool gnutls_initialized = false;
1000
bool gpgme_initialized = false;
1001
float delay = 2.5f;
1002
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1006
uid = getuid();
1007
gid = getgid();
1008
1009
/* Lower any group privileges we might have, just to be safe */
1010
errno = 0;
1011
ret = setgid(gid);
1012
if(ret == -1){
1013
perror("setgid");
1014
}
1015
1016
/* Lower user privileges (temporarily) */
1017
errno = 0;
1018
ret = seteuid(uid);
1019
if(ret == -1){
1020
perror("seteuid");
1021
}
1022
1023
if(quit_now){
1024
goto end;
1025
}
1026
1027
{
1028
struct argp_option options[] = {
1029
{ .name = "debug", .key = 128,
1030
.doc = "Debug mode", .group = 3 },
1031
{ .name = "connect", .key = 'c',
1032
.arg = "ADDRESS:PORT",
1033
.doc = "Connect directly to a specific Mandos server",
1034
.group = 1 },
1035
{ .name = "interface", .key = 'i',
1036
.arg = "NAME",
1037
.doc = "Network interface that will be used to search for"
1038
" Mandos servers",
1039
.group = 1 },
1040
{ .name = "seckey", .key = 's',
1041
.arg = "FILE",
1042
.doc = "OpenPGP secret key file base name",
1043
.group = 1 },
1044
{ .name = "pubkey", .key = 'p',
1045
.arg = "FILE",
1046
.doc = "OpenPGP public key file base name",
1047
.group = 2 },
1048
{ .name = "dh-bits", .key = 129,
1049
.arg = "BITS",
1050
.doc = "Bit length of the prime number used in the"
1051
" Diffie-Hellman key exchange",
1052
.group = 2 },
1053
{ .name = "priority", .key = 130,
1054
.arg = "STRING",
1055
.doc = "GnuTLS priority string for the TLS handshake",
1056
.group = 1 },
1057
{ .name = "delay", .key = 131,
1058
.arg = "SECONDS",
1059
.doc = "Maximum delay to wait for interface startup",
1060
.group = 2 },
1061
{ .name = NULL }
1062
};
1063
1064
error_t parse_opt(int key, char *arg,
1065
struct argp_state *state){
1066
switch(key){
1067
case 128: /* --debug */
1068
debug = true;
1069
break;
1070
case 'c': /* --connect */
1071
connect_to = arg;
1072
break;
1073
case 'i': /* --interface */
1074
interface = arg;
1075
break;
1076
case 's': /* --seckey */
1077
seckey = arg;
1078
break;
1079
case 'p': /* --pubkey */
1080
pubkey = arg;
1081
break;
1082
case 129: /* --dh-bits */
1083
errno = 0;
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1089
}
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
break;
1092
case 130: /* --priority */
1093
mc.priority = arg;
1094
break;
1095
case 131: /* --delay */
1096
errno = 0;
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1106
break;
1107
default:
1108
return ARGP_ERR_UNKNOWN;
1109
}
1110
return 0;
1111
}
1112
1113
struct argp argp = { .options = options, .parser = parse_opt,
1114
.args_doc = "",
1115
.doc = "Mandos client -- Get and decrypt"
1116
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
1123
}
1124
1125
if(not debug){
1126
avahi_set_log_function(empty_log);
1127
}
1128
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1137
goto end;
1138
}
1139
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1151
goto end;
1152
}
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1157
goto end;
1158
}
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1162
*/
1163
ret = sigaction(SIGINT, 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(SIGINT, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1180
}
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
ret = sigaction(SIGTERM, 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(SIGTERM, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
829
int sd;
830
uid_t uid;
831
gid_t gid;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
844
{
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
851
.group = 1 },
852
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
856
.group = 1 },
857
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
860
.group = 1 },
861
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
864
.group = 2 },
865
{ .name = "dh-bits", .key = 129,
866
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
869
.group = 2 },
870
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
874
{ .name = NULL }
875
};
876
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
881
debug = true;
882
break;
883
case 'c': /* --connect */
884
connect_to = arg;
885
break;
886
case 'i': /* --interface */
887
interface = arg;
888
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
900
exit(EXIT_FAILURE);
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
break;
904
case 130: /* --priority */
905
mc.priority = arg;
906
break;
907
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
910
break;
911
default:
912
return ARGP_ERR_UNKNOWN;
913
}
914
return 0;
915
}
916
917
struct argp argp = { .options = options, .parser = parse_opt,
918
.args_doc = "",
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
959
uid = getuid();
960
gid = getgid();
961
962
ret = setuid(uid);
963
if(ret == -1){
964
perror("setuid");
965
}
966
967
setgid(gid);
968
if(ret == -1){
969
perror("setgid");
970
}
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
1205
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
996
if(if_index == 0){
1207
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
1345
}
1346
1347
if(quit_now){
1348
goto end;
1349
}
1350
1351
ret = init_gnutls_global(pubkey, seckey);
1352
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
1355
goto end;
1356
} else {
1357
gnutls_initialized = true;
1358
}
1359
1360
if(quit_now){
1361
goto end;
1362
}
1363
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
1371
if(quit_now){
1372
goto end;
1373
}
1374
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
1378
goto end;
1379
} else {
1380
gpgme_initialized = true;
1381
}
1382
1383
if(quit_now){
1384
goto end;
1385
}
1386
1387
if(connect_to != NULL){
1388
/* Connect directly, do not use Zeroconf */
1389
/* (Mainly meant for debugging) */
1390
char *address = strrchr(connect_to, ':');
1391
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
uint16_t port;
1402
errno = 0;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
1408
goto end;
1409
}
1410
1411
if(quit_now){
1412
goto end;
1413
}
1414
1415
port = (uint16_t)tmpmax;
1416
*address = '\0';
1417
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1419
int af;
1420
if(strchr(address, ':') != NULL){
1421
af = AF_INET6;
1422
} else {
1423
af = AF_INET;
1424
}
1425
1426
if(quit_now){
1427
goto end;
1428
}
1429
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
1434
exitcode = EXIT_SUCCESS;
1435
}
1436
goto end;
1437
}
1438
1439
if(quit_now){
1440
goto end;
1441
}
1442
1443
{
1444
AvahiServerConfig config;
1445
/* Do not publish any local Zeroconf records */
1446
avahi_server_config_init(&config);
1447
config.publish_hinfo = 0;
1448
config.publish_addresses = 0;
1449
config.publish_workstation = 0;
1450
config.publish_domain = 0;
1451
1452
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
1456
1457
/* Free the Avahi configuration data */
1458
avahi_server_config_free(&config);
1459
}
1460
1461
/* Check if creating the Avahi server object succeeded */
1462
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
1469
if(quit_now){
1470
goto end;
1471
}
1472
1473
/* Create the Avahi service browser */
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1477
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
1481
goto end;
1482
}
1483
1484
if(quit_now){
1485
goto end;
1486
}
1487
1488
/* Run the main loop */
1489
1490
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
1495
998
exit(EXIT_FAILURE);
999
}
1000
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
port = (uint16_t)tmpmax;
1019
*address = '\0';
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1022
if(ret < 0){
1023
exitcode = EXIT_FAILURE;
1024
} else {
1025
exitcode = EXIT_SUCCESS;
1026
}
1027
goto end;
1028
}
1029
1030
if(not debug){
1031
avahi_set_log_function(empty_log);
1032
}
1033
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1036
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
" object.\n");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
1046
{
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1054
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1058
NULL, &error);
1059
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1062
}
1063
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1074
AVAHI_PROTO_INET6,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1077
if(sb == NULL) {
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1081
goto end;
1082
}
1083
1084
/* Run the main loop */
1085
1086
if(debug){
1087
fprintf(stderr, "Starting Avahi loop search\n");
1088
}
1089
1090
avahi_simple_poll_loop(mc.simple_poll);
1091
1496
1092
end:
1497
1498
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
1500
}
1501
1502
/* Cleanup things */
1503
if(sb != NULL)
1504
avahi_s_service_browser_free(sb);
1505
1506
if(mc.server != NULL)
1507
avahi_server_free(mc.server);
1508
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
1511
1512
if(gnutls_initialized){
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
1515
gnutls_dh_params_deinit(mc.dh_params);
1516
}
1517
1518
if(gpgme_initialized){
1519
gpgme_release(mc.ctx);
1520
}
1521
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
1596
}
1597
1598
if(quit_now){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
1606
}
1607
1608
return exitcode;
1093
1094
if(debug){
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1096
}
1097
1098
/* Cleanup things */
1099
if(sb != NULL)
1100
avahi_s_service_browser_free(sb);
1101
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1157
return exitcode;
1609
1158
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0