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- Committer: Björn Påhlsson
- Date: 2008-08-03 20:35:01 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 41.
- Revision ID: belorn@braxen-20080803203501-av7janz21ve7iq0b
mandosclient
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
- files added:
- server.conf
- files renamed:
- mandos-clients.conf => clients.conf
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
8
8
* includes the following functions: "resolve_callback",
9
9
* "browse_callback", and parts of "main".
10
10
*
11
* Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
12
* Påhlsson.
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
13
*
14
14
* This program is free software: you can redistribute it and/or
15
15
* modify it under the terms of the GNU General Public License as
25
25
* along with this program. If not, see
26
26
* <http://www.gnu.org/licenses/>.
27
27
*
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
#define _FORTIFY_SOURCE 2
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
32
#define _LARGEFILE_SOURCE
35
33
#define _FILE_OFFSET_BITS 64
36
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
37
#include <stdio.h>
38
38
#include <assert.h>
39
39
#include <stdlib.h>
40
40
#include <time.h>
41
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
43
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
44
46
45
47
#include <avahi-core/core.h>
46
48
#include <avahi-core/lookup.h>
49
51
#include <avahi-common/malloc.h>
50
52
#include <avahi-common/error.h>
51
53
52
//mandos client part
54
/* Mandos client part */
53
55
#include <sys/types.h> /* socket(), inet_pton() */
54
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
57
struct in6_addr, inet_pton() */
62
64
#include <string.h> /* memset */
63
65
#include <arpa/inet.h> /* inet_pton() */
64
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
65
68
66
// gpgme
69
/* GPGME */
67
70
#include <errno.h> /* perror() */
68
71
#include <gpgme.h>
69
72
70
// getopt long
73
/* getopt_long */
71
74
#include <getopt.h>
72
75
73
76
#define BUFFER_SIZE 256
74
#define DH_BITS 1024
75
77
76
const char *certdir = "/conf/conf.d/cryptkeyreq/";
77
const char *certfile = "openpgp-client.txt";
78
const char *certkey = "openpgp-client-key.txt";
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
79
81
80
82
bool debug = false;
81
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
82
87
typedef struct {
83
gnutls_session_t session;
88
AvahiSimplePoll *simple_poll;
89
AvahiServer *server;
84
90
gnutls_certificate_credentials_t cred;
91
unsigned int dh_bits;
85
92
gnutls_dh_params_t dh_params;
86
} encrypted_session;
87
88
89
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
90
char **new_packet, const char *homedir){
93
const char *priority;
94
} mandos_context;
95
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
97
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
99
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
101
return 0;
102
}
103
buffer_capacity += BUFFER_SIZE;
104
}
105
return buffer_capacity;
106
}
107
108
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
111
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
91
116
gpgme_data_t dh_crypto, dh_plain;
92
117
gpgme_ctx_t ctx;
93
118
gpgme_error_t rc;
94
119
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
97
122
gpgme_engine_info_t engine_info;
98
123
99
124
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
101
126
}
102
127
103
128
/* Init GPGME */
109
134
return -1;
110
135
}
111
136
112
/* Set GPGME home directory */
137
/* Set GPGME home directory for the OpenPGP engine only */
113
138
rc = gpgme_get_engine_info (&engine_info);
114
139
if (rc != GPG_ERR_NO_ERROR){
115
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
125
150
engine_info = engine_info->next;
126
151
}
127
152
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
129
154
return -1;
130
155
}
131
156
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
157
/* Create new GPGME data buffer from memory cryptotext */
158
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
0);
134
160
if (rc != GPG_ERR_NO_ERROR){
135
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
162
gpgme_strsource(rc), gpgme_strerror(rc));
142
168
if (rc != GPG_ERR_NO_ERROR){
143
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
144
170
gpgme_strsource(rc), gpgme_strerror(rc));
171
gpgme_data_release(dh_crypto);
145
172
return -1;
146
173
}
147
174
150
177
if (rc != GPG_ERR_NO_ERROR){
151
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
179
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
180
plaintext_length = -1;
181
goto decrypt_end;
154
182
}
155
183
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
184
/* Decrypt data from the cryptotext data buffer to the plaintext
185
data buffer */
158
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
187
if (rc != GPG_ERR_NO_ERROR){
160
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
161
189
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
190
plaintext_length = -1;
191
goto decrypt_end;
163
192
}
164
193
165
194
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
167
196
}
168
197
169
198
if (debug){
170
199
gpgme_decrypt_result_t result;
171
200
result = gpgme_op_decrypt_result(ctx);
195
224
}
196
225
}
197
226
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
200
201
227
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
229
perror("pgpme_data_seek");
230
plaintext_length = -1;
231
goto decrypt_end;
204
232
}
205
233
206
*new_packet = 0;
234
*plaintext = NULL;
207
235
while(true){
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
211
+ BUFFER_SIZE);
212
if (*new_packet == NULL){
213
perror("realloc");
214
return -1;
215
}
216
new_packet_capacity += BUFFER_SIZE;
236
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
237
plaintext_capacity);
238
if (plaintext_capacity == 0){
239
perror("adjustbuffer");
240
plaintext_length = -1;
241
goto decrypt_end;
217
242
}
218
243
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
244
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
245
BUFFER_SIZE);
221
246
/* Print the data, if any */
222
247
if (ret == 0){
248
/* EOF */
223
249
break;
224
250
}
225
251
if(ret < 0){
226
252
perror("gpgme_data_read");
227
return -1;
253
plaintext_length = -1;
254
goto decrypt_end;
228
255
}
229
new_packet_length += ret;
256
plaintext_length += ret;
230
257
}
231
258
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
234
/* if(debug){ */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
238
/* } */
259
if(debug){
260
fprintf(stderr, "Decrypted password is: ");
261
for(ssize_t i = 0; i < plaintext_length; i++){
262
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
263
}
264
fprintf(stderr, "\n");
265
}
266
267
decrypt_end:
268
269
/* Delete the GPGME cryptotext data buffer */
270
gpgme_data_release(dh_crypto);
239
271
240
272
/* Delete the GPGME plaintext data buffer */
241
273
gpgme_data_release(dh_plain);
242
return new_packet_length;
274
return plaintext_length;
243
275
}
244
276
245
277
static const char * safer_gnutls_strerror (int value) {
249
281
return ret;
250
282
}
251
283
252
void debuggnutls(__attribute__((unused)) int level,
253
const char* string){
254
fprintf(stderr, "%s", string);
284
/* GnuTLS log function callback */
285
static void debuggnutls(__attribute__((unused)) int level,
286
const char* string){
287
fprintf(stderr, "GnuTLS: %s", string);
255
288
}
256
289
257
int initgnutls(encrypted_session *es){
258
const char *err;
290
static int init_gnutls_global(mandos_context *mc){
259
291
int ret;
260
292
261
293
if(debug){
264
296
265
297
if ((ret = gnutls_global_init ())
266
298
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
299
fprintf (stderr, "GnuTLS global_init: %s\n",
300
safer_gnutls_strerror(ret));
268
301
return -1;
269
302
}
270
303
271
304
if (debug){
305
/* "Use a log level over 10 to enable all debugging options."
306
* - GnuTLS manual
307
*/
272
308
gnutls_global_set_log_level(11);
273
309
gnutls_global_set_log_function(debuggnutls);
274
310
}
275
311
276
/* openpgp credentials */
277
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
312
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
278
314
!= GNUTLS_E_SUCCESS) {
279
fprintf (stderr, "memory error: %s\n",
315
fprintf (stderr, "GnuTLS memory error: %s\n",
280
316
safer_gnutls_strerror(ret));
281
317
return -1;
282
318
}
283
319
284
320
if(debug){
285
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
286
" and keyfile %s as GnuTLS credentials\n", certfile,
287
certkey);
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
288
324
}
289
325
290
326
ret = gnutls_certificate_set_openpgp_key_file
291
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
292
328
if (ret != GNUTLS_E_SUCCESS) {
293
fprintf
294
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
295
" '%s')\n",
296
ret, certfile, certkey);
297
fprintf(stdout, "The Error is: %s\n",
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",
298
333
safer_gnutls_strerror(ret));
299
334
return -1;
300
335
}
301
336
302
//GnuTLS server initialization
303
if ((ret = gnutls_dh_params_init (&es->dh_params))
304
!= GNUTLS_E_SUCCESS) {
305
fprintf (stderr, "Error in dh parameter initialization: %s\n",
306
safer_gnutls_strerror(ret));
307
return -1;
308
}
309
310
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
311
!= GNUTLS_E_SUCCESS) {
312
fprintf (stderr, "Error in prime generation: %s\n",
313
safer_gnutls_strerror(ret));
314
return -1;
315
}
316
317
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
318
319
// GnuTLS session creation
320
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
321
!= GNUTLS_E_SUCCESS){
337
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(&mc->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(mc->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, mc->dh_params);
352
353
return 0;
354
}
355
356
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
357
int ret;
358
/* GnuTLS session creation */
359
ret = gnutls_init(session, GNUTLS_SERVER);
360
if (ret != GNUTLS_E_SUCCESS){
322
361
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
323
362
safer_gnutls_strerror(ret));
324
363
}
325
364
326
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Syntax error at: %s\n", err);
329
fprintf(stderr, "GnuTLS error: %s\n",
330
safer_gnutls_strerror(ret));
331
return -1;
365
{
366
const char *err;
367
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf(stderr, "Syntax error at: %s\n", err);
370
fprintf(stderr, "GnuTLS error: %s\n",
371
safer_gnutls_strerror(ret));
372
return -1;
373
}
332
374
}
333
375
334
if ((ret = gnutls_credentials_set
335
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
336
!= GNUTLS_E_SUCCESS) {
337
fprintf(stderr, "Error setting a credentials set: %s\n",
376
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
377
mc->cred);
378
if (ret != GNUTLS_E_SUCCESS) {
379
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
338
380
safer_gnutls_strerror(ret));
339
381
return -1;
340
382
}
341
383
342
384
/* ignore client certificate if any. */
343
gnutls_certificate_server_set_request (es->session,
385
gnutls_certificate_server_set_request (*session,
344
386
GNUTLS_CERT_IGNORE);
345
387
346
gnutls_dh_set_prime_bits (es->session, DH_BITS);
388
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
347
389
348
390
return 0;
349
391
}
350
392
351
void empty_log(__attribute__((unused)) AvahiLogLevel level,
352
__attribute__((unused)) const char *txt){}
393
/* Avahi log function callback */
394
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
395
__attribute__((unused)) const char *txt){}
353
396
354
int start_mandos_communication(const char *ip, uint16_t port,
355
unsigned int if_index){
397
/* Called when a Mandos server is found */
398
static int start_mandos_communication(const char *ip, uint16_t port,
399
AvahiIfIndex if_index,
400
mandos_context *mc){
356
401
int ret, tcp_sd;
357
402
struct sockaddr_in6 to;
358
encrypted_session es;
359
403
char *buffer = NULL;
360
404
char *decrypted_buffer;
361
405
size_t buffer_length = 0;
362
406
size_t buffer_capacity = 0;
363
407
ssize_t decrypted_buffer_size;
364
size_t written = 0;
408
size_t written;
365
409
int retval = 0;
366
410
char interface[IF_NAMESIZE];
411
gnutls_session_t session;
412
gnutls_dh_params_t dh_params;
413
414
ret = init_gnutls_session (mc, &session);
415
if (ret != 0){
416
return -1;
417
}
367
418
368
419
if(debug){
369
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
420
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
421
ip, port);
370
422
}
371
423
372
424
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
376
428
}
377
429
378
430
if(debug){
379
if(if_indextoname(if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
431
if(if_indextoname((unsigned int)if_index, interface) == NULL){
432
perror("if_indextoname");
383
433
return -1;
384
434
}
385
386
435
fprintf(stderr, "Binding to interface %s\n", interface);
387
436
}
388
437
389
438
memset(&to,0,sizeof(to)); /* Spurious warning */
390
439
to.sin6_family = AF_INET6;
440
/* It would be nice to have a way to detect if we were passed an
441
IPv4 address here. Now we assume an IPv6 address. */
391
442
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
392
443
if (ret < 0 ){
393
444
perror("inet_pton");
394
445
return -1;
395
}
446
}
396
447
if(ret == 0){
397
448
fprintf(stderr, "Bad address: %s\n", ip);
398
449
return -1;
402
453
to.sin6_scope_id = (uint32_t)if_index;
403
454
404
455
if(debug){
405
fprintf(stderr, "Connection to: %s\n", ip);
456
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
457
char addrstr[INET6_ADDRSTRLEN] = "";
458
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
459
sizeof(addrstr)) == NULL){
460
perror("inet_ntop");
461
} else {
462
if(strcmp(addrstr, ip) != 0){
463
fprintf(stderr, "Canonical address form: %s\n", addrstr);
464
}
465
}
406
466
}
407
467
408
468
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
410
470
perror("connect");
411
471
return -1;
412
472
}
413
414
ret = initgnutls (&es);
415
if (ret != 0){
416
retval = -1;
417
return -1;
473
474
const char *out = mandos_protocol_version;
475
written = 0;
476
while (true){
477
size_t out_size = strlen(out);
478
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
479
out_size - written));
480
if (ret == -1){
481
perror("write");
482
retval = -1;
483
goto mandos_end;
484
}
485
written += (size_t)ret;
486
if(written < out_size){
487
continue;
488
} else {
489
if (out == mandos_protocol_version){
490
written = 0;
491
out = "\r\n";
492
} else {
493
break;
494
}
495
}
418
496
}
419
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
422
497
423
498
if(debug){
424
499
fprintf(stderr, "Establishing TLS session with %s\n", ip);
425
500
}
426
501
427
ret = gnutls_handshake (es.session);
502
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
503
504
ret = gnutls_handshake (session);
428
505
429
506
if (ret != GNUTLS_E_SUCCESS){
430
507
if(debug){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
508
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
432
509
gnutls_perror (ret);
433
510
}
434
511
retval = -1;
435
goto exit;
512
goto mandos_end;
436
513
}
437
514
438
//Retrieve OpenPGP packet that contains the wanted password
515
/* Read OpenPGP packet that contains the wanted password */
439
516
440
517
if(debug){
441
518
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
443
520
}
444
521
445
522
while(true){
446
if (buffer_length + BUFFER_SIZE > buffer_capacity){
447
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
448
if (buffer == NULL){
449
perror("realloc");
450
goto exit;
451
}
452
buffer_capacity += BUFFER_SIZE;
523
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
524
if (buffer_capacity == 0){
525
perror("adjustbuffer");
526
retval = -1;
527
goto mandos_end;
453
528
}
454
529
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
530
ret = gnutls_record_recv(session, buffer+buffer_length,
531
BUFFER_SIZE);
457
532
if (ret == 0){
458
533
break;
459
534
}
463
538
case GNUTLS_E_AGAIN:
464
539
break;
465
540
case GNUTLS_E_REHANDSHAKE:
466
ret = gnutls_handshake (es.session);
541
ret = gnutls_handshake (session);
467
542
if (ret < 0){
468
fprintf(stderr, "\n*** Handshake failed ***\n");
543
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
469
544
gnutls_perror (ret);
470
545
retval = -1;
471
goto exit;
546
goto mandos_end;
472
547
}
473
548
break;
474
549
default:
475
550
fprintf(stderr, "Unknown error while reading data from"
476
" encrypted session with mandos server\n");
551
" encrypted session with Mandos server\n");
477
552
retval = -1;
478
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
479
goto exit;
553
gnutls_bye (session, GNUTLS_SHUT_RDWR);
554
goto mandos_end;
480
555
}
481
556
} else {
482
557
buffer_length += (size_t) ret;
483
558
}
484
559
}
485
560
561
if(debug){
562
fprintf(stderr, "Closing TLS session\n");
563
}
564
565
gnutls_bye (session, GNUTLS_SHUT_RDWR);
566
486
567
if (buffer_length > 0){
487
568
decrypted_buffer_size = pgp_packet_decrypt(buffer,
488
569
buffer_length,
489
570
&decrypted_buffer,
490
certdir);
571
keydir);
491
572
if (decrypted_buffer_size >= 0){
492
while(written < (size_t)decrypted_buffer_size){
573
written = 0;
574
while(written < (size_t) decrypted_buffer_size){
493
575
ret = (int)fwrite (decrypted_buffer + written, 1,
494
576
(size_t)decrypted_buffer_size - written,
495
577
stdout);
508
590
retval = -1;
509
591
}
510
592
}
511
512
//shutdown procedure
513
514
if(debug){
515
fprintf(stderr, "Closing TLS session\n");
516
}
517
593
594
/* Shutdown procedure */
595
596
mandos_end:
518
597
free(buffer);
519
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
520
exit:
521
598
close(tcp_sd);
522
gnutls_deinit (es.session);
523
gnutls_certificate_free_credentials (es.cred);
599
gnutls_deinit (session);
600
gnutls_certificate_free_credentials (mc->cred);
524
601
gnutls_global_deinit ();
525
602
return retval;
526
603
}
527
604
528
static AvahiSimplePoll *simple_poll = NULL;
529
static AvahiServer *server = NULL;
530
531
static void resolve_callback(
532
AvahiSServiceResolver *r,
533
AvahiIfIndex interface,
534
AVAHI_GCC_UNUSED AvahiProtocol protocol,
535
AvahiResolverEvent event,
536
const char *name,
537
const char *type,
538
const char *domain,
539
const char *host_name,
540
const AvahiAddress *address,
541
uint16_t port,
542
AVAHI_GCC_UNUSED AvahiStringList *txt,
543
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
544
AVAHI_GCC_UNUSED void* userdata) {
545
605
static void resolve_callback(AvahiSServiceResolver *r,
606
AvahiIfIndex interface,
607
AVAHI_GCC_UNUSED AvahiProtocol protocol,
608
AvahiResolverEvent event,
609
const char *name,
610
const char *type,
611
const char *domain,
612
const char *host_name,
613
const AvahiAddress *address,
614
uint16_t port,
615
AVAHI_GCC_UNUSED AvahiStringList *txt,
616
AVAHI_GCC_UNUSED AvahiLookupResultFlags
617
flags,
618
void* userdata) {
619
mandos_context *mc = userdata;
546
620
assert(r); /* Spurious warning */
547
621
548
622
/* Called whenever a service has been resolved successfully or
551
625
switch (event) {
552
626
default:
553
627
case AVAHI_RESOLVER_FAILURE:
554
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
555
" type '%s' in domain '%s': %s\n", name, type, domain,
556
avahi_strerror(avahi_server_errno(server)));
628
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
629
" of type '%s' in domain '%s': %s\n", name, type, domain,
630
avahi_strerror(avahi_server_errno(mc->server)));
557
631
break;
558
632
559
633
case AVAHI_RESOLVER_FOUND:
561
635
char ip[AVAHI_ADDRESS_STR_MAX];
562
636
avahi_address_snprint(ip, sizeof(ip), address);
563
637
if(debug){
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" port %d\n", name, host_name, ip, port);
638
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
639
" port %d\n", name, host_name, ip, interface, port);
566
640
}
567
int ret = start_mandos_communication(ip, port,
568
(unsigned int) interface);
641
int ret = start_mandos_communication(ip, port, interface, mc);
569
642
if (ret == 0){
570
643
exit(EXIT_SUCCESS);
571
644
}
574
647
avahi_s_service_resolver_free(r);
575
648
}
576
649
577
static void browse_callback(
578
AvahiSServiceBrowser *b,
579
AvahiIfIndex interface,
580
AvahiProtocol protocol,
581
AvahiBrowserEvent event,
582
const char *name,
583
const char *type,
584
const char *domain,
585
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
586
void* userdata) {
587
588
AvahiServer *s = userdata;
589
assert(b); /* Spurious warning */
590
591
/* Called whenever a new services becomes available on the LAN or
592
is removed from the LAN */
593
594
switch (event) {
595
default:
596
case AVAHI_BROWSER_FAILURE:
597
598
fprintf(stderr, "(Browser) %s\n",
599
avahi_strerror(avahi_server_errno(server)));
600
avahi_simple_poll_quit(simple_poll);
601
return;
602
603
case AVAHI_BROWSER_NEW:
604
/* We ignore the returned resolver object. In the callback
605
function we free it. If the server is terminated before
606
the callback function is called the server will free
607
the resolver for us. */
608
609
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
610
type, domain,
611
AVAHI_PROTO_INET6, 0,
612
resolve_callback, s)))
613
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
614
avahi_strerror(avahi_server_errno(s)));
615
break;
616
617
case AVAHI_BROWSER_REMOVE:
618
break;
619
620
case AVAHI_BROWSER_ALL_FOR_NOW:
621
case AVAHI_BROWSER_CACHE_EXHAUSTED:
622
break;
650
static void browse_callback( AvahiSServiceBrowser *b,
651
AvahiIfIndex interface,
652
AvahiProtocol protocol,
653
AvahiBrowserEvent event,
654
const char *name,
655
const char *type,
656
const char *domain,
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
flags,
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(b); /* Spurious warning */
662
663
/* Called whenever a new services becomes available on the LAN or
664
is removed from the LAN */
665
666
switch (event) {
667
default:
668
case AVAHI_BROWSER_FAILURE:
669
670
fprintf(stderr, "(Avahi browser) %s\n",
671
avahi_strerror(avahi_server_errno(mc->server)));
672
avahi_simple_poll_quit(mc->simple_poll);
673
return;
674
675
case AVAHI_BROWSER_NEW:
676
/* We ignore the returned Avahi resolver object. In the callback
677
function we free it. If the Avahi server is terminated before
678
the callback function is called the Avahi server will free the
679
resolver for us. */
680
681
if (!(avahi_s_service_resolver_new(mc->server, interface,
682
protocol, name, type, domain,
683
AVAHI_PROTO_INET6, 0,
684
resolve_callback, mc)))
685
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
686
name, avahi_strerror(avahi_server_errno(mc->server)));
687
break;
688
689
case AVAHI_BROWSER_REMOVE:
690
break;
691
692
case AVAHI_BROWSER_ALL_FOR_NOW:
693
case AVAHI_BROWSER_CACHE_EXHAUSTED:
694
if(debug){
695
fprintf(stderr, "No Mandos server found, still searching...\n");
623
696
}
697
break;
698
}
624
699
}
625
700
626
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
627
const char *combinepath(const char *first, const char *second){
628
char *tmp;
629
tmp = malloc(strlen(first) + strlen(second) + 2);
701
/* Combines file name and path and returns the malloced new
702
string. some sane checks could/should be added */
703
static const char *combinepath(const char *first, const char *second){
704
size_t f_len = strlen(first);
705
size_t s_len = strlen(second);
706
char *tmp = malloc(f_len + s_len + 2);
630
707
if (tmp == NULL){
631
perror("malloc");
632
708
return NULL;
633
709
}
634
strcpy(tmp, first);
635
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
636
strcat(tmp, "/");
637
}
638
strcat(tmp, second);
710
if(f_len > 0){
711
memcpy(tmp, first, f_len); /* Spurious warning */
712
}
713
tmp[f_len] = '/';
714
if(s_len > 0){
715
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
716
}
717
tmp[f_len + 1 + s_len] = '\0';
639
718
return tmp;
640
719
}
641
720
642
721
643
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
644
AvahiServerConfig config;
722
int main(int argc, char *argv[]){
645
723
AvahiSServiceBrowser *sb = NULL;
646
724
int error;
647
725
int ret;
648
int returncode = EXIT_SUCCESS;
726
int exitcode = EXIT_SUCCESS;
649
727
const char *interface = "eth0";
650
728
struct ifreq network;
651
729
int sd;
652
653
while (true){
654
static struct option long_options[] = {
655
{"debug", no_argument, (int *)&debug, 1},
656
{"interface", required_argument, 0, 'i'},
657
{"certdir", required_argument, 0, 'd'},
658
{"certkey", required_argument, 0, 'c'},
659
{"certfile", required_argument, 0, 'k'},
660
{0, 0, 0, 0} };
661
662
int option_index = 0;
663
ret = getopt_long (argc, argv, "i:", long_options,
664
&option_index);
665
666
if (ret == -1){
667
break;
668
}
669
670
switch(ret){
671
case 0:
672
break;
673
case 'i':
674
interface = optarg;
675
break;
676
case 'd':
677
certdir = optarg;
678
break;
679
case 'c':
680
certfile = optarg;
681
break;
682
case 'k':
683
certkey = optarg;
684
break;
685
default:
686
exit(EXIT_FAILURE);
687
}
688
}
689
690
certfile = combinepath(certdir, certfile);
691
if (certfile == NULL){
692
returncode = EXIT_FAILURE;
693
goto exit;
694
}
695
696
certkey = combinepath(certdir, certkey);
697
if (certkey == NULL){
698
returncode = EXIT_FAILURE;
699
goto exit;
700
}
701
702
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
703
if(sd < 0) {
704
perror("socket");
705
returncode = EXIT_FAILURE;
706
goto exit;
707
}
708
strcpy(network.ifr_name, interface);
709
ret = ioctl(sd, SIOCGIFFLAGS, &network);
710
if(ret == -1){
711
712
perror("ioctl SIOCGIFFLAGS");
713
returncode = EXIT_FAILURE;
714
goto exit;
715
}
716
if((network.ifr_flags & IFF_UP) == 0){
717
network.ifr_flags |= IFF_UP;
718
ret = ioctl(sd, SIOCSIFFLAGS, &network);
730
uid_t uid;
731
gid_t gid;
732
char *connect_to = NULL;
733
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
734
mandos_context mc = { .simple_poll = NULL, .server = NULL,
735
.dh_bits = 1024, .priority = "SECURE256"};
736
737
{
738
/* Temporary int to get the address of for getopt_long */
739
int debug_int = debug ? 1 : 0;
740
while (true){
741
struct option long_options[] = {
742
{"debug", no_argument, &debug_int, 1},
743
{"connect", required_argument, NULL, 'c'},
744
{"interface", required_argument, NULL, 'i'},
745
{"keydir", required_argument, NULL, 'd'},
746
{"seckey", required_argument, NULL, 's'},
747
{"pubkey", required_argument, NULL, 'p'},
748
{"dh-bits", required_argument, NULL, 'D'},
749
{"priority", required_argument, NULL, 'P'},
750
{0, 0, 0, 0} };
751
752
int option_index = 0;
753
ret = getopt_long (argc, argv, "i:", long_options,
754
&option_index);
755
756
if (ret == -1){
757
break;
758
}
759
760
switch(ret){
761
case 0:
762
break;
763
case 'i':
764
interface = optarg;
765
break;
766
case 'c':
767
connect_to = optarg;
768
break;
769
case 'd':
770
keydir = optarg;
771
break;
772
case 'p':
773
pubkeyfile = optarg;
774
break;
775
case 's':
776
seckeyfile = optarg;
777
break;
778
case 'D':
779
errno = 0;
780
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
781
if (errno){
782
perror("strtol");
783
exit(EXIT_FAILURE);
784
}
785
break;
786
case 'P':
787
mc.priority = optarg;
788
break;
789
case '?':
790
default:
791
/* getopt_long() has already printed a message about the
792
unrcognized option, so just exit. */
793
exit(EXIT_FAILURE);
794
}
795
}
796
/* Set the global debug flag from the temporary int */
797
debug = debug_int ? true : false;
798
}
799
800
pubkeyfile = combinepath(keydir, pubkeyfile);
801
if (pubkeyfile == NULL){
802
perror("combinepath");
803
exitcode = EXIT_FAILURE;
804
goto end;
805
}
806
807
seckeyfile = combinepath(keydir, seckeyfile);
808
if (seckeyfile == NULL){
809
perror("combinepath");
810
goto end;
811
}
812
813
ret = init_gnutls_global(&mc);
814
if (ret == -1){
815
fprintf(stderr, "init_gnutls_global\n");
816
goto end;
817
}
818
819
uid = getuid();
820
gid = getgid();
821
822
ret = setuid(uid);
823
if (ret == -1){
824
perror("setuid");
825
}
826
827
setgid(gid);
828
if (ret == -1){
829
perror("setgid");
830
}
831
832
if_index = (AvahiIfIndex) if_nametoindex(interface);
833
if(if_index == 0){
834
fprintf(stderr, "No such interface: \"%s\"\n", interface);
835
exit(EXIT_FAILURE);
836
}
837
838
if(connect_to != NULL){
839
/* Connect directly, do not use Zeroconf */
840
/* (Mainly meant for debugging) */
841
char *address = strrchr(connect_to, ':');
842
if(address == NULL){
843
fprintf(stderr, "No colon in address\n");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
errno = 0;
848
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
849
if(errno){
850
perror("Bad port number");
851
exitcode = EXIT_FAILURE;
852
goto end;
853
}
854
*address = '\0';
855
address = connect_to;
856
ret = start_mandos_communication(address, port, if_index, &mc);
857
if(ret < 0){
858
exitcode = EXIT_FAILURE;
859
} else {
860
exitcode = EXIT_SUCCESS;
861
}
862
goto end;
863
}
864
865
/* If the interface is down, bring it up */
866
{
867
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
868
if(sd < 0) {
869
perror("socket");
870
exitcode = EXIT_FAILURE;
871
goto end;
872
}
873
strcpy(network.ifr_name, interface); /* Spurious warning */
874
ret = ioctl(sd, SIOCGIFFLAGS, &network);
719
875
if(ret == -1){
720
perror("ioctl SIOCSIFFLAGS");
721
returncode = EXIT_FAILURE;
722
goto exit;
723
}
876
perror("ioctl SIOCGIFFLAGS");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
if((network.ifr_flags & IFF_UP) == 0){
881
network.ifr_flags |= IFF_UP;
882
ret = ioctl(sd, SIOCSIFFLAGS, &network);
883
if(ret == -1){
884
perror("ioctl SIOCSIFFLAGS");
885
exitcode = EXIT_FAILURE;
886
goto end;
887
}
888
}
889
close(sd);
724
890
}
725
close(sd);
726
891
727
892
if (not debug){
728
893
avahi_set_log_function(empty_log);
729
894
}
730
895
731
/* Initialize the psuedo-RNG */
896
/* Initialize the pseudo-RNG for Avahi */
732
897
srand((unsigned int) time(NULL));
733
734
/* Allocate main loop object */
735
if (!(simple_poll = avahi_simple_poll_new())) {
736
fprintf(stderr, "Failed to create simple poll object.\n");
737
returncode = EXIT_FAILURE;
738
goto exit;
739
}
740
741
/* Do not publish any local records */
742
avahi_server_config_init(&config);
743
config.publish_hinfo = 0;
744
config.publish_addresses = 0;
745
config.publish_workstation = 0;
746
config.publish_domain = 0;
747
748
/* Allocate a new server */
749
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
750
&config, NULL, NULL, &error);
751
752
/* Free the configuration data */
753
avahi_server_config_free(&config);
754
755
/* Check if creating the server object succeeded */
756
if (!server) {
757
fprintf(stderr, "Failed to create server: %s\n",
898
899
/* Allocate main Avahi loop object */
900
mc.simple_poll = avahi_simple_poll_new();
901
if (mc.simple_poll == NULL) {
902
fprintf(stderr, "Avahi: Failed to create simple poll"
903
" object.\n");
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
908
{
909
AvahiServerConfig config;
910
/* Do not publish any local Zeroconf records */
911
avahi_server_config_init(&config);
912
config.publish_hinfo = 0;
913
config.publish_addresses = 0;
914
config.publish_workstation = 0;
915
config.publish_domain = 0;
916
917
/* Allocate a new server */
918
mc.server = avahi_server_new(avahi_simple_poll_get
919
(mc.simple_poll), &config, NULL,
920
NULL, &error);
921
922
/* Free the Avahi configuration data */
923
avahi_server_config_free(&config);
924
}
925
926
/* Check if creating the Avahi server object succeeded */
927
if (mc.server == NULL) {
928
fprintf(stderr, "Failed to create Avahi server: %s\n",
758
929
avahi_strerror(error));
759
returncode = EXIT_FAILURE;
760
goto exit;
930
exitcode = EXIT_FAILURE;
931
goto end;
761
932
}
762
933
763
/* Create the service browser */
764
sb = avahi_s_service_browser_new(server,
765
(AvahiIfIndex)
766
if_nametoindex(interface),
934
/* Create the Avahi service browser */
935
sb = avahi_s_service_browser_new(mc.server, if_index,
767
936
AVAHI_PROTO_INET6,
768
937
"_mandos._tcp", NULL, 0,
769
browse_callback, server);
770
if (!sb) {
938
browse_callback, &mc);
939
if (sb == NULL) {
771
940
fprintf(stderr, "Failed to create service browser: %s\n",
772
avahi_strerror(avahi_server_errno(server)));
773
returncode = EXIT_FAILURE;
774
goto exit;
941
avahi_strerror(avahi_server_errno(mc.server)));
942
exitcode = EXIT_FAILURE;
943
goto end;
775
944
}
776
945
777
946
/* Run the main loop */
778
947
779
948
if (debug){
780
fprintf(stderr, "Starting avahi loop search\n");
949
fprintf(stderr, "Starting Avahi loop search\n");
781
950
}
782
951
783
avahi_simple_poll_loop(simple_poll);
952
avahi_simple_poll_loop(mc.simple_poll);
784
953
785
exit:
954
end:
786
955
787
956
if (debug){
788
957
fprintf(stderr, "%s exiting\n", argv[0]);
789
958
}
790
959
791
960
/* Cleanup things */
792
if (sb)
961
if (sb != NULL)
793
962
avahi_s_service_browser_free(sb);
794
963
795
if (server)
796
avahi_server_free(server);
964
if (mc.server != NULL)
965
avahi_server_free(mc.server);
797
966
798
if (simple_poll)
799
avahi_simple_poll_free(simple_poll);
800
free(certfile);
801
free(certkey);
967
if (mc.simple_poll != NULL)
968
avahi_simple_poll_free(mc.simple_poll);
969
free(pubkeyfile);
970
free(seckeyfile);
802
971
803
return returncode;
972
return exitcode;
804
973
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0