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- Committer: Björn Påhlsson
- Date: 2007-10-20 21:38:25 UTC
- Revision ID: belorn@tower-20071020213825-abf6f0d1c33ee961
First working version with: IPv6, GnuTLS, X.509 certificates, DN
retrieval.
retrieval.
- files added:
- bad-ca.pem
- files removed:
- TODO
- plugins.d
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
4
*
5
* This program is partly derived from an example program for an Avahi
6
* service browser, downloaded from
7
* <http://avahi.org/browser/examples/core-browse-services.c>. This
8
* includes the following functions: "resolve_callback",
9
* "browse_callback", and parts of "main".
10
*
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
*
14
* This program is free software: you can redistribute it and/or
15
* modify it under the terms of the GNU General Public License as
16
* published by the Free Software Foundation, either version 3 of the
17
* License, or (at your option) any later version.
18
*
19
* This program is distributed in the hope that it will be useful, but
20
* WITHOUT ANY WARRANTY; without even the implied warranty of
21
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22
* General Public License for more details.
23
*
24
* You should have received a copy of the GNU General Public License
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
27
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
*/
30
31
/* Needed by GPGME, specifically gpgme_data_seek() */
32
#define _LARGEFILE_SOURCE
33
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
47
#include <avahi-core/core.h>
48
#include <avahi-core/lookup.h>
49
#include <avahi-core/log.h>
50
#include <avahi-common/simple-watch.h>
51
#include <avahi-common/malloc.h>
52
#include <avahi-common/error.h>
53
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
69
/* GPGME */
70
#include <errno.h> /* perror() */
71
#include <gpgme.h>
72
73
/* getopt_long */
74
#include <getopt.h>
75
76
#define BUFFER_SIZE 256
77
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
81
82
bool debug = false;
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
87
typedef struct {
88
AvahiSimplePoll *simple_poll;
89
AvahiServer *server;
90
gnutls_certificate_credentials_t cred;
91
unsigned int dh_bits;
92
const char *priority;
93
} mandos_context;
94
95
size_t adjustbuffer(char **buffer, size_t buffer_length,
96
size_t buffer_capacity){
97
if (buffer_length + BUFFER_SIZE > buffer_capacity){
98
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
99
if (buffer == NULL){
100
return 0;
101
}
102
buffer_capacity += BUFFER_SIZE;
103
}
104
return buffer_capacity;
105
}
106
107
/*
108
* Decrypt OpenPGP data using keyrings in HOMEDIR.
109
* Returns -1 on error
110
*/
111
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
size_t crypto_size,
113
char **plaintext,
114
const char *homedir){
115
gpgme_data_t dh_crypto, dh_plain;
116
gpgme_ctx_t ctx;
117
gpgme_error_t rc;
118
ssize_t ret;
119
size_t plaintext_capacity = 0;
120
ssize_t plaintext_length = 0;
121
gpgme_engine_info_t engine_info;
122
123
if (debug){
124
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
125
}
126
127
/* Init GPGME */
128
gpgme_check_version(NULL);
129
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
130
if (rc != GPG_ERR_NO_ERROR){
131
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
132
gpgme_strsource(rc), gpgme_strerror(rc));
133
return -1;
134
}
135
136
/* Set GPGME home directory for the OpenPGP engine only */
137
rc = gpgme_get_engine_info (&engine_info);
138
if (rc != GPG_ERR_NO_ERROR){
139
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
140
gpgme_strsource(rc), gpgme_strerror(rc));
141
return -1;
142
}
143
while(engine_info != NULL){
144
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
145
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
146
engine_info->file_name, homedir);
147
break;
148
}
149
engine_info = engine_info->next;
150
}
151
if(engine_info == NULL){
152
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
153
return -1;
154
}
155
156
/* Create new GPGME data buffer from memory cryptotext */
157
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
158
0);
159
if (rc != GPG_ERR_NO_ERROR){
160
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
161
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
163
}
164
165
/* Create new empty GPGME data buffer for the plaintext */
166
rc = gpgme_data_new(&dh_plain);
167
if (rc != GPG_ERR_NO_ERROR){
168
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
169
gpgme_strsource(rc), gpgme_strerror(rc));
170
gpgme_data_release(dh_crypto);
171
return -1;
172
}
173
174
/* Create new GPGME "context" */
175
rc = gpgme_new(&ctx);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_new: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
plaintext_length = -1;
180
goto decrypt_end;
181
}
182
183
/* Decrypt data from the cryptotext data buffer to the plaintext
184
data buffer */
185
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
plaintext_length = -1;
190
goto decrypt_end;
191
}
192
193
if(debug){
194
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
195
}
196
197
if (debug){
198
gpgme_decrypt_result_t result;
199
result = gpgme_op_decrypt_result(ctx);
200
if (result == NULL){
201
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
202
} else {
203
fprintf(stderr, "Unsupported algorithm: %s\n",
204
result->unsupported_algorithm);
205
fprintf(stderr, "Wrong key usage: %d\n",
206
result->wrong_key_usage);
207
if(result->file_name != NULL){
208
fprintf(stderr, "File name: %s\n", result->file_name);
209
}
210
gpgme_recipient_t recipient;
211
recipient = result->recipients;
212
if(recipient){
213
while(recipient != NULL){
214
fprintf(stderr, "Public key algorithm: %s\n",
215
gpgme_pubkey_algo_name(recipient->pubkey_algo));
216
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
217
fprintf(stderr, "Secret key available: %s\n",
218
recipient->status == GPG_ERR_NO_SECKEY
219
? "No" : "Yes");
220
recipient = recipient->next;
221
}
222
}
223
}
224
}
225
226
/* Seek back to the beginning of the GPGME plaintext data buffer */
227
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
228
perror("pgpme_data_seek");
229
plaintext_length = -1;
230
goto decrypt_end;
231
}
232
233
*plaintext = NULL;
234
while(true){
235
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
236
plaintext_capacity);
237
if (plaintext_capacity == 0){
238
perror("adjustbuffer");
239
plaintext_length = -1;
240
goto decrypt_end;
241
}
242
243
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
244
BUFFER_SIZE);
245
/* Print the data, if any */
246
if (ret == 0){
247
/* EOF */
248
break;
249
}
250
if(ret < 0){
251
perror("gpgme_data_read");
252
plaintext_length = -1;
253
goto decrypt_end;
254
}
255
plaintext_length += ret;
256
}
257
258
if(debug){
259
fprintf(stderr, "Decrypted password is: ");
260
for(ssize_t i = 0; i < plaintext_length; i++){
261
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
262
}
263
fprintf(stderr, "\n");
264
}
265
266
decrypt_end:
267
268
/* Delete the GPGME cryptotext data buffer */
269
gpgme_data_release(dh_crypto);
270
271
/* Delete the GPGME plaintext data buffer */
272
gpgme_data_release(dh_plain);
273
return plaintext_length;
274
}
275
276
static const char * safer_gnutls_strerror (int value) {
277
const char *ret = gnutls_strerror (value);
278
if (ret == NULL)
279
ret = "(unknown)";
280
return ret;
281
}
282
283
/* GnuTLS log function callback */
284
static void debuggnutls(__attribute__((unused)) int level,
285
const char* string){
286
fprintf(stderr, "GnuTLS: %s", string);
287
}
288
289
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
290
gnutls_dh_params_t *dh_params){
291
int ret;
292
293
if(debug){
294
fprintf(stderr, "Initializing GnuTLS\n");
295
}
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "GnuTLS global_init: %s\n",
300
safer_gnutls_strerror(ret));
301
return -1;
302
}
303
304
if (debug){
305
/* "Use a log level over 10 to enable all debugging options."
306
* - GnuTLS manual
307
*/
308
gnutls_global_set_log_level(11);
309
gnutls_global_set_log_function(debuggnutls);
310
}
311
312
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
316
safer_gnutls_strerror(ret));
317
return -1;
318
}
319
320
if(debug){
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
324
}
325
326
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
328
if (ret != GNUTLS_E_SUCCESS) {
329
fprintf(stderr,
330
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
333
safer_gnutls_strerror(ret));
334
return -1;
335
}
336
337
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(dh_params);
339
if (ret != GNUTLS_E_SUCCESS) {
340
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
" %s\n", safer_gnutls_strerror(ret));
342
return -1;
343
}
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
safer_gnutls_strerror(ret));
348
return -1;
349
}
350
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
352
353
/* GnuTLS session creation */
354
ret = gnutls_init(session, GNUTLS_SERVER);
355
if (ret != GNUTLS_E_SUCCESS){
356
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
357
safer_gnutls_strerror(ret));
358
}
359
360
{
361
const char *err;
362
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
363
if (ret != GNUTLS_E_SUCCESS) {
364
fprintf(stderr, "Syntax error at: %s\n", err);
365
fprintf(stderr, "GnuTLS error: %s\n",
366
safer_gnutls_strerror(ret));
367
return -1;
368
}
369
}
370
371
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
372
mc->cred);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
375
safer_gnutls_strerror(ret));
376
return -1;
377
}
378
379
/* ignore client certificate if any. */
380
gnutls_certificate_server_set_request (*session,
381
GNUTLS_CERT_IGNORE);
382
383
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
384
385
return 0;
386
}
387
388
/* Avahi log function callback */
389
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
390
__attribute__((unused)) const char *txt){}
391
392
/* Called when a Mandos server is found */
393
static int start_mandos_communication(const char *ip, uint16_t port,
394
AvahiIfIndex if_index,
395
mandos_context *mc){
396
int ret, tcp_sd;
397
struct sockaddr_in6 to;
398
char *buffer = NULL;
399
char *decrypted_buffer;
400
size_t buffer_length = 0;
401
size_t buffer_capacity = 0;
402
ssize_t decrypted_buffer_size;
403
size_t written;
404
int retval = 0;
405
char interface[IF_NAMESIZE];
406
gnutls_session_t session;
407
gnutls_dh_params_t dh_params;
408
409
ret = initgnutls (mc, &session, &dh_params);
410
if (ret != 0){
411
return -1;
412
}
413
414
if(debug){
415
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
416
ip, port);
417
}
418
419
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
420
if(tcp_sd < 0) {
421
perror("socket");
422
return -1;
423
}
424
425
if(debug){
426
if(if_indextoname((unsigned int)if_index, interface) == NULL){
427
perror("if_indextoname");
428
return -1;
429
}
430
fprintf(stderr, "Binding to interface %s\n", interface);
431
}
432
433
memset(&to,0,sizeof(to)); /* Spurious warning */
434
to.sin6_family = AF_INET6;
435
/* It would be nice to have a way to detect if we were passed an
436
IPv4 address here. Now we assume an IPv6 address. */
437
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
438
if (ret < 0 ){
439
perror("inet_pton");
440
return -1;
441
}
442
if(ret == 0){
443
fprintf(stderr, "Bad address: %s\n", ip);
444
return -1;
445
}
446
to.sin6_port = htons(port); /* Spurious warning */
447
448
to.sin6_scope_id = (uint32_t)if_index;
449
450
if(debug){
451
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
452
char addrstr[INET6_ADDRSTRLEN] = "";
453
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
454
sizeof(addrstr)) == NULL){
455
perror("inet_ntop");
456
} else {
457
if(strcmp(addrstr, ip) != 0){
458
fprintf(stderr, "Canonical address form: %s\n", addrstr);
459
}
460
}
461
}
462
463
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
464
if (ret < 0){
465
perror("connect");
466
return -1;
467
}
468
469
const char *out = mandos_protocol_version;
470
written = 0;
471
while (true){
472
size_t out_size = strlen(out);
473
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
474
out_size - written));
475
if (ret == -1){
476
perror("write");
477
retval = -1;
478
goto mandos_end;
479
}
480
written += (size_t)ret;
481
if(written < out_size){
482
continue;
483
} else {
484
if (out == mandos_protocol_version){
485
written = 0;
486
out = "\r\n";
487
} else {
488
break;
489
}
490
}
491
}
492
493
if(debug){
494
fprintf(stderr, "Establishing TLS session with %s\n", ip);
495
}
496
497
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
498
499
ret = gnutls_handshake (session);
500
501
if (ret != GNUTLS_E_SUCCESS){
502
if(debug){
503
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
504
gnutls_perror (ret);
505
}
506
retval = -1;
507
goto mandos_end;
508
}
509
510
/* Read OpenPGP packet that contains the wanted password */
511
512
if(debug){
513
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
514
ip);
515
}
516
517
while(true){
518
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
519
if (buffer_capacity == 0){
520
perror("adjustbuffer");
521
retval = -1;
522
goto mandos_end;
523
}
524
525
ret = gnutls_record_recv(session, buffer+buffer_length,
526
BUFFER_SIZE);
527
if (ret == 0){
528
break;
529
}
530
if (ret < 0){
531
switch(ret){
532
case GNUTLS_E_INTERRUPTED:
533
case GNUTLS_E_AGAIN:
534
break;
535
case GNUTLS_E_REHANDSHAKE:
536
ret = gnutls_handshake (session);
537
if (ret < 0){
538
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
539
gnutls_perror (ret);
540
retval = -1;
541
goto mandos_end;
542
}
543
break;
544
default:
545
fprintf(stderr, "Unknown error while reading data from"
546
" encrypted session with Mandos server\n");
547
retval = -1;
548
gnutls_bye (session, GNUTLS_SHUT_RDWR);
549
goto mandos_end;
550
}
551
} else {
552
buffer_length += (size_t) ret;
553
}
554
}
555
556
if(debug){
557
fprintf(stderr, "Closing TLS session\n");
558
}
559
560
gnutls_bye (session, GNUTLS_SHUT_RDWR);
561
562
if (buffer_length > 0){
563
decrypted_buffer_size = pgp_packet_decrypt(buffer,
564
buffer_length,
565
&decrypted_buffer,
566
keydir);
567
if (decrypted_buffer_size >= 0){
568
written = 0;
569
while(written < (size_t) decrypted_buffer_size){
570
ret = (int)fwrite (decrypted_buffer + written, 1,
571
(size_t)decrypted_buffer_size - written,
572
stdout);
573
if(ret == 0 and ferror(stdout)){
574
if(debug){
575
fprintf(stderr, "Error writing encrypted data: %s\n",
576
strerror(errno));
577
}
578
retval = -1;
579
break;
580
}
581
written += (size_t)ret;
582
}
583
free(decrypted_buffer);
584
} else {
585
retval = -1;
586
}
587
}
588
589
/* Shutdown procedure */
590
591
mandos_end:
592
free(buffer);
593
close(tcp_sd);
594
gnutls_deinit (session);
595
gnutls_certificate_free_credentials (mc->cred);
596
gnutls_global_deinit ();
597
return retval;
598
}
599
600
static void resolve_callback(AvahiSServiceResolver *r,
601
AvahiIfIndex interface,
602
AVAHI_GCC_UNUSED AvahiProtocol protocol,
603
AvahiResolverEvent event,
604
const char *name,
605
const char *type,
606
const char *domain,
607
const char *host_name,
608
const AvahiAddress *address,
609
uint16_t port,
610
AVAHI_GCC_UNUSED AvahiStringList *txt,
611
AVAHI_GCC_UNUSED AvahiLookupResultFlags
612
flags,
613
void* userdata) {
614
mandos_context *mc = userdata;
615
assert(r); /* Spurious warning */
616
617
/* Called whenever a service has been resolved successfully or
618
timed out */
619
620
switch (event) {
621
default:
622
case AVAHI_RESOLVER_FAILURE:
623
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
624
" of type '%s' in domain '%s': %s\n", name, type, domain,
625
avahi_strerror(avahi_server_errno(mc->server)));
626
break;
627
628
case AVAHI_RESOLVER_FOUND:
629
{
630
char ip[AVAHI_ADDRESS_STR_MAX];
631
avahi_address_snprint(ip, sizeof(ip), address);
632
if(debug){
633
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
634
" port %d\n", name, host_name, ip, interface, port);
635
}
636
int ret = start_mandos_communication(ip, port, interface, mc);
637
if (ret == 0){
638
exit(EXIT_SUCCESS);
639
}
640
}
641
}
642
avahi_s_service_resolver_free(r);
643
}
644
645
static void browse_callback( AvahiSServiceBrowser *b,
646
AvahiIfIndex interface,
647
AvahiProtocol protocol,
648
AvahiBrowserEvent event,
649
const char *name,
650
const char *type,
651
const char *domain,
652
AVAHI_GCC_UNUSED AvahiLookupResultFlags
653
flags,
654
void* userdata) {
655
mandos_context *mc = userdata;
656
assert(b); /* Spurious warning */
657
658
/* Called whenever a new services becomes available on the LAN or
659
is removed from the LAN */
660
661
switch (event) {
662
default:
663
case AVAHI_BROWSER_FAILURE:
664
665
fprintf(stderr, "(Avahi browser) %s\n",
666
avahi_strerror(avahi_server_errno(mc->server)));
667
avahi_simple_poll_quit(mc->simple_poll);
668
return;
669
670
case AVAHI_BROWSER_NEW:
671
/* We ignore the returned Avahi resolver object. In the callback
672
function we free it. If the Avahi server is terminated before
673
the callback function is called the Avahi server will free the
674
resolver for us. */
675
676
if (!(avahi_s_service_resolver_new(mc->server, interface,
677
protocol, name, type, domain,
678
AVAHI_PROTO_INET6, 0,
679
resolve_callback, mc)))
680
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
681
name, avahi_strerror(avahi_server_errno(mc->server)));
682
break;
683
684
case AVAHI_BROWSER_REMOVE:
685
break;
686
687
case AVAHI_BROWSER_ALL_FOR_NOW:
688
case AVAHI_BROWSER_CACHE_EXHAUSTED:
689
if(debug){
690
fprintf(stderr, "No Mandos server found, still searching...\n");
691
}
692
break;
693
}
694
}
695
696
/* Combines file name and path and returns the malloced new
697
string. some sane checks could/should be added */
698
static const char *combinepath(const char *first, const char *second){
699
size_t f_len = strlen(first);
700
size_t s_len = strlen(second);
701
char *tmp = malloc(f_len + s_len + 2);
702
if (tmp == NULL){
703
return NULL;
704
}
705
if(f_len > 0){
706
memcpy(tmp, first, f_len); /* Spurious warning */
707
}
708
tmp[f_len] = '/';
709
if(s_len > 0){
710
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
711
}
712
tmp[f_len + 1 + s_len] = '\0';
713
return tmp;
714
}
715
716
717
int main(int argc, char *argv[]){
718
AvahiSServiceBrowser *sb = NULL;
719
int error;
720
int ret;
721
int exitcode = EXIT_SUCCESS;
722
const char *interface = "eth0";
723
struct ifreq network;
724
int sd;
725
char *connect_to = NULL;
726
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
727
mandos_context mc = { .simple_poll = NULL, .server = NULL,
728
.dh_bits = 1024, .priority = "SECURE256"};
729
730
{
731
/* Temporary int to get the address of for getopt_long */
732
int debug_int = debug ? 1 : 0;
733
while (true){
734
struct option long_options[] = {
735
{"debug", no_argument, &debug_int, 1},
736
{"connect", required_argument, NULL, 'c'},
737
{"interface", required_argument, NULL, 'i'},
738
{"keydir", required_argument, NULL, 'd'},
739
{"seckey", required_argument, NULL, 's'},
740
{"pubkey", required_argument, NULL, 'p'},
741
{"dh-bits", required_argument, NULL, 'D'},
742
{"priority", required_argument, NULL, 'P'},
743
{0, 0, 0, 0} };
744
745
int option_index = 0;
746
ret = getopt_long (argc, argv, "i:", long_options,
747
&option_index);
748
749
if (ret == -1){
750
break;
751
}
752
753
switch(ret){
754
case 0:
755
break;
756
case 'i':
757
interface = optarg;
758
break;
759
case 'c':
760
connect_to = optarg;
761
break;
762
case 'd':
763
keydir = optarg;
764
break;
765
case 'p':
766
pubkeyfile = optarg;
767
break;
768
case 's':
769
seckeyfile = optarg;
770
break;
771
case 'D':
772
errno = 0;
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
774
if (errno){
775
perror("strtol");
776
exit(EXIT_FAILURE);
777
}
778
break;
779
case 'P':
780
mc.priority = optarg;
781
break;
782
case '?':
783
default:
784
/* getopt_long() has already printed a message about the
785
unrcognized option, so just exit. */
786
exit(EXIT_FAILURE);
787
}
788
}
789
/* Set the global debug flag from the temporary int */
790
debug = debug_int ? true : false;
791
}
792
793
pubkeyfile = combinepath(keydir, pubkeyfile);
794
if (pubkeyfile == NULL){
795
perror("combinepath");
796
exitcode = EXIT_FAILURE;
797
goto end;
798
}
799
800
seckeyfile = combinepath(keydir, seckeyfile);
801
if (seckeyfile == NULL){
802
perror("combinepath");
803
goto end;
804
}
805
806
if_index = (AvahiIfIndex) if_nametoindex(interface);
807
if(if_index == 0){
808
fprintf(stderr, "No such interface: \"%s\"\n", interface);
809
exit(EXIT_FAILURE);
810
}
811
812
if(connect_to != NULL){
813
/* Connect directly, do not use Zeroconf */
814
/* (Mainly meant for debugging) */
815
char *address = strrchr(connect_to, ':');
816
if(address == NULL){
817
fprintf(stderr, "No colon in address\n");
818
exit(EXIT_FAILURE);
819
}
820
errno = 0;
821
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
822
if(errno){
823
perror("Bad port number");
824
exit(EXIT_FAILURE);
825
}
826
*address = '\0';
827
address = connect_to;
828
ret = start_mandos_communication(address, port, if_index, &mc);
829
if(ret < 0){
830
exit(EXIT_FAILURE);
831
} else {
832
exit(EXIT_SUCCESS);
833
}
834
}
835
836
/* If the interface is down, bring it up */
837
{
838
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
839
if(sd < 0) {
840
perror("socket");
841
exitcode = EXIT_FAILURE;
842
goto end;
843
}
844
strcpy(network.ifr_name, interface); /* Spurious warning */
845
ret = ioctl(sd, SIOCGIFFLAGS, &network);
846
if(ret == -1){
847
perror("ioctl SIOCGIFFLAGS");
848
exitcode = EXIT_FAILURE;
849
goto end;
850
}
851
if((network.ifr_flags & IFF_UP) == 0){
852
network.ifr_flags |= IFF_UP;
853
ret = ioctl(sd, SIOCSIFFLAGS, &network);
854
if(ret == -1){
855
perror("ioctl SIOCSIFFLAGS");
856
exitcode = EXIT_FAILURE;
857
goto end;
858
}
859
}
860
close(sd);
861
}
862
863
if (not debug){
864
avahi_set_log_function(empty_log);
865
}
866
867
/* Initialize the pseudo-RNG for Avahi */
868
srand((unsigned int) time(NULL));
869
870
/* Allocate main Avahi loop object */
871
mc.simple_poll = avahi_simple_poll_new();
872
if (mc.simple_poll == NULL) {
873
fprintf(stderr, "Avahi: Failed to create simple poll"
874
" object.\n");
875
exitcode = EXIT_FAILURE;
876
goto end;
877
}
878
879
{
880
AvahiServerConfig config;
881
/* Do not publish any local Zeroconf records */
882
avahi_server_config_init(&config);
883
config.publish_hinfo = 0;
884
config.publish_addresses = 0;
885
config.publish_workstation = 0;
886
config.publish_domain = 0;
887
888
/* Allocate a new server */
889
mc.server = avahi_server_new(avahi_simple_poll_get
890
(mc.simple_poll), &config, NULL,
891
NULL, &error);
892
893
/* Free the Avahi configuration data */
894
avahi_server_config_free(&config);
895
}
896
897
/* Check if creating the Avahi server object succeeded */
898
if (mc.server == NULL) {
899
fprintf(stderr, "Failed to create Avahi server: %s\n",
900
avahi_strerror(error));
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
905
/* Create the Avahi service browser */
906
sb = avahi_s_service_browser_new(mc.server, if_index,
907
AVAHI_PROTO_INET6,
908
"_mandos._tcp", NULL, 0,
909
browse_callback, &mc);
910
if (sb == NULL) {
911
fprintf(stderr, "Failed to create service browser: %s\n",
912
avahi_strerror(avahi_server_errno(mc.server)));
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
917
/* Run the main loop */
918
919
if (debug){
920
fprintf(stderr, "Starting Avahi loop search\n");
921
}
922
923
avahi_simple_poll_loop(mc.simple_poll);
924
925
end:
926
927
if (debug){
928
fprintf(stderr, "%s exiting\n", argv[0]);
929
}
930
931
/* Cleanup things */
932
if (sb != NULL)
933
avahi_s_service_browser_free(sb);
934
935
if (mc.server != NULL)
936
avahi_server_free(mc.server);
937
938
if (mc.simple_poll != NULL)
939
avahi_simple_poll_free(mc.simple_poll);
940
free(pubkeyfile);
941
free(seckeyfile);
942
943
return exitcode;
944
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0