To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandosclient.c
- browse files at revision 46
- compare with another revision
- download diff
- download tarball
- view history from revision 46
- Committer: Teddy Hogeborn
- Date: 2008-08-04 23:38:26 UTC
- mfrom: (24.1.20 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804233826-idy7v8x36llseue0
* network-protocol.txt: New.
* server.py (daemon): Do the double fork thing.
* server.py (daemon): Do the double fork thing.
- files added:
- network-protocol.txt
- files removed:
- ca.pem
- 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,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
42
46
43
47
#include <avahi-core/core.h>
44
48
#include <avahi-core/lookup.h>
47
51
#include <avahi-common/malloc.h>
48
52
#include <avahi-common/error.h>
49
53
50
//mandos client part
54
/* Mandos client part */
51
55
#include <sys/types.h> /* socket(), inet_pton() */
52
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
57
struct in6_addr, inet_pton() */
60
64
#include <string.h> /* memset */
61
65
#include <arpa/inet.h> /* inet_pton() */
62
66
#include <iso646.h> /* not */
63
64
// gpgme
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
65
72
#include <errno.h> /* perror() */
66
73
#include <gpgme.h>
67
74
68
// getopt long
69
#include <getopt.h>
70
71
75
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
74
const char *certdir = "/conf/conf.d/cryptkeyreq/";
75
const char *certfile = "openpgp-client.txt";
76
const char *certkey = "openpgp-client-key.txt";
77
76
78
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
82
83
/* Used for passing in values through the Avahi callback functions */
80
84
typedef struct {
81
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
82
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
83
89
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
90
const char *priority;
91
} mandos_context;
92
93
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
96
* "buffer_length" is how much is already used.
97
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
103
return 0;
104
}
105
buffer_capacity += BUFFER_SIZE;
106
}
107
return buffer_capacity;
108
}
109
110
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
113
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
89
118
gpgme_data_t dh_crypto, dh_plain;
90
119
gpgme_ctx_t ctx;
91
120
gpgme_error_t rc;
92
121
ssize_t ret;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
95
124
gpgme_engine_info_t engine_info;
96
125
97
126
if (debug){
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
99
128
}
100
129
101
130
/* Init GPGME */
107
136
return -1;
108
137
}
109
138
110
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
111
140
rc = gpgme_get_engine_info (&engine_info);
112
141
if (rc != GPG_ERR_NO_ERROR){
113
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
123
152
engine_info = engine_info->next;
124
153
}
125
154
if(engine_info == NULL){
126
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
127
156
return -1;
128
157
}
129
158
130
/* Create new GPGME data buffer from packet buffer */
131
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
132
162
if (rc != GPG_ERR_NO_ERROR){
133
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
134
164
gpgme_strsource(rc), gpgme_strerror(rc));
140
170
if (rc != GPG_ERR_NO_ERROR){
141
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
142
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
143
174
return -1;
144
175
}
145
176
148
179
if (rc != GPG_ERR_NO_ERROR){
149
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
150
181
gpgme_strsource(rc), gpgme_strerror(rc));
151
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
152
184
}
153
185
154
/* Decrypt data from the FILE pointer to the plaintext data
155
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
156
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
157
189
if (rc != GPG_ERR_NO_ERROR){
158
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
159
191
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
161
194
}
162
195
163
196
if(debug){
164
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
165
198
}
166
199
167
200
if (debug){
168
201
gpgme_decrypt_result_t result;
169
202
result = gpgme_op_decrypt_result(ctx);
193
226
}
194
227
}
195
228
196
/* Delete the GPGME FILE pointer cryptotext data buffer */
197
gpgme_data_release(dh_crypto);
198
199
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
200
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
201
202
*new_packet = 0;
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
}
235
236
*plaintext = NULL;
203
237
while(true){
204
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
205
*new_packet = realloc(*new_packet,
206
(unsigned int)new_packet_capacity
207
+ BUFFER_SIZE);
208
if (*new_packet == NULL){
209
perror("realloc");
210
return -1;
211
}
212
new_packet_capacity += BUFFER_SIZE;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
213
245
}
214
246
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
248
BUFFER_SIZE);
217
249
/* Print the data, if any */
218
250
if (ret == 0){
251
/* EOF */
219
252
break;
220
253
}
221
254
if(ret < 0){
222
255
perror("gpgme_data_read");
223
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
224
258
}
225
new_packet_length += ret;
259
plaintext_length += ret;
226
260
}
227
261
228
/* FIXME: check characters before printing to screen so to not print
229
terminal control characters */
230
/* if(debug){ */
231
/* fprintf(stderr, "decrypted password is: "); */
232
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
233
/* fprintf(stderr, "\n"); */
234
/* } */
262
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
264
for(ssize_t i = 0; i < plaintext_length; i++){
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
}
267
fprintf(stderr, "\n");
268
}
269
270
decrypt_end:
271
272
/* Delete the GPGME cryptotext data buffer */
273
gpgme_data_release(dh_crypto);
235
274
236
275
/* Delete the GPGME plaintext data buffer */
237
276
gpgme_data_release(dh_plain);
238
return new_packet_length;
277
return plaintext_length;
239
278
}
240
279
241
280
static const char * safer_gnutls_strerror (int value) {
245
284
return ret;
246
285
}
247
286
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
251
291
}
252
292
253
int initgnutls(encrypted_session *es){
254
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
255
296
int ret;
256
297
257
298
if(debug){
260
301
261
302
if ((ret = gnutls_global_init ())
262
303
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
264
306
return -1;
265
307
}
266
308
267
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
268
313
gnutls_global_set_log_level(11);
269
314
gnutls_global_set_log_function(debuggnutls);
270
315
}
271
316
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
274
319
!= GNUTLS_E_SUCCESS) {
275
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
276
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
277
323
return -1;
278
324
}
279
325
280
326
if(debug){
281
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
284
330
}
285
331
286
332
ret = gnutls_certificate_set_openpgp_key_file
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
288
334
if (ret != GNUTLS_E_SUCCESS) {
289
fprintf
290
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
291
" '%s')\n",
292
ret, certfile, certkey);
293
fprintf(stdout, "The Error is: %s\n",
335
fprintf(stderr,
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
294
339
safer_gnutls_strerror(ret));
295
return -1;
296
}
297
298
//GnuTLS server initialization
299
if ((ret = gnutls_dh_params_init (&es->dh_params))
300
!= GNUTLS_E_SUCCESS) {
301
fprintf (stderr, "Error in dh parameter initialization: %s\n",
302
safer_gnutls_strerror(ret));
303
return -1;
304
}
305
306
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
307
!= GNUTLS_E_SUCCESS) {
308
fprintf (stderr, "Error in prime generation: %s\n",
309
safer_gnutls_strerror(ret));
310
return -1;
311
}
312
313
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
314
315
// GnuTLS session creation
316
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
317
!= GNUTLS_E_SUCCESS){
340
goto globalfail;
341
}
342
343
/* GnuTLS server initialization */
344
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
348
goto globalfail;
349
}
350
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
354
goto globalfail;
355
}
356
357
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
358
359
return 0;
360
361
globalfail:
362
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
365
return -1;
366
367
}
368
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
371
int ret;
372
/* GnuTLS session creation */
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
318
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
376
safer_gnutls_strerror(ret));
320
377
}
321
378
322
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf(stderr, "Syntax error at: %s\n", err);
325
fprintf(stderr, "GnuTLS error: %s\n",
326
safer_gnutls_strerror(ret));
327
return -1;
379
{
380
const char *err;
381
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Syntax error at: %s\n", err);
384
fprintf(stderr, "GnuTLS error: %s\n",
385
safer_gnutls_strerror(ret));
386
gnutls_deinit (*session);
387
return -1;
388
}
328
389
}
329
390
330
if ((ret = gnutls_credentials_set
331
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
332
!= GNUTLS_E_SUCCESS) {
333
fprintf(stderr, "Error setting a credentials set: %s\n",
391
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
392
mc->cred);
393
if (ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
335
397
return -1;
336
398
}
337
399
338
400
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
401
gnutls_certificate_server_set_request (*session,
340
402
GNUTLS_CERT_IGNORE);
341
403
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
343
405
344
406
return 0;
345
407
}
346
408
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
349
412
350
int start_mandos_communication(const char *ip, uint16_t port,
351
unsigned int if_index){
413
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
352
417
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
355
419
char *buffer = NULL;
356
420
char *decrypted_buffer;
357
421
size_t buffer_length = 0;
358
422
size_t buffer_capacity = 0;
359
423
ssize_t decrypted_buffer_size;
360
size_t written = 0;
424
size_t written;
361
425
int retval = 0;
362
426
char interface[IF_NAMESIZE];
427
gnutls_session_t session;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
363
433
364
434
if(debug){
365
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
366
437
}
367
438
368
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
370
441
perror("socket");
371
442
return -1;
372
443
}
373
374
if(if_indextoname(if_index, interface) == NULL){
375
if(debug){
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
447
perror("if_indextoname");
448
return -1;
377
449
}
378
return -1;
379
}
380
381
if(debug){
382
450
fprintf(stderr, "Binding to interface %s\n", interface);
383
451
}
384
452
385
453
memset(&to,0,sizeof(to)); /* Spurious warning */
386
to.sin6_family = AF_INET6;
387
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
388
458
if (ret < 0 ){
389
459
perror("inet_pton");
390
460
return -1;
391
}
461
}
392
462
if(ret == 0){
393
463
fprintf(stderr, "Bad address: %s\n", ip);
394
464
return -1;
395
465
}
396
to.sin6_port = htons(port); /* Spurious warning */
466
to.in6.sin6_port = htons(port); /* Spurious warning */
397
467
398
to.sin6_scope_id = (uint32_t)if_index;
468
to.in6.sin6_scope_id = (uint32_t)if_index;
399
469
400
470
if(debug){
401
fprintf(stderr, "Connection to: %s\n", ip);
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
476
} else {
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
479
}
480
}
402
481
}
403
482
404
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
405
484
if (ret < 0){
406
485
perror("connect");
407
486
return -1;
408
487
}
409
410
ret = initgnutls (&es);
411
if (ret != 0){
412
retval = -1;
413
return -1;
488
489
const char *out = mandos_protocol_version;
490
written = 0;
491
while (true){
492
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
495
if (ret == -1){
496
perror("write");
497
retval = -1;
498
goto mandos_end;
499
}
500
written += (size_t)ret;
501
if(written < out_size){
502
continue;
503
} else {
504
if (out == mandos_protocol_version){
505
written = 0;
506
out = "\r\n";
507
} else {
508
break;
509
}
510
}
414
511
}
415
416
gnutls_transport_set_ptr (es.session,
417
(gnutls_transport_ptr_t) tcp_sd);
418
512
419
513
if(debug){
420
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
421
515
}
422
516
423
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
424
520
425
521
if (ret != GNUTLS_E_SUCCESS){
426
522
if(debug){
427
fprintf(stderr, "\n*** Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
428
524
gnutls_perror (ret);
429
525
}
430
526
retval = -1;
431
goto exit;
527
goto mandos_end;
432
528
}
433
529
434
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
435
531
436
532
if(debug){
437
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
439
535
}
440
536
441
537
while(true){
442
if (buffer_length + BUFFER_SIZE > buffer_capacity){
443
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
444
if (buffer == NULL){
445
perror("realloc");
446
goto exit;
447
}
448
buffer_capacity += BUFFER_SIZE;
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
539
buffer_capacity);
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
542
retval = -1;
543
goto mandos_end;
449
544
}
450
545
451
ret = gnutls_record_recv
452
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
453
548
if (ret == 0){
454
549
break;
455
550
}
459
554
case GNUTLS_E_AGAIN:
460
555
break;
461
556
case GNUTLS_E_REHANDSHAKE:
462
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
463
558
if (ret < 0){
464
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
465
560
gnutls_perror (ret);
466
561
retval = -1;
467
goto exit;
562
goto mandos_end;
468
563
}
469
564
break;
470
565
default:
471
566
fprintf(stderr, "Unknown error while reading data from"
472
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
473
568
retval = -1;
474
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
475
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
476
571
}
477
572
} else {
478
573
buffer_length += (size_t) ret;
479
574
}
480
575
}
481
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
482
583
if (buffer_length > 0){
483
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
484
585
buffer_length,
485
586
&decrypted_buffer,
486
certdir);
587
keydir);
487
588
if (decrypted_buffer_size >= 0){
488
while(written < decrypted_buffer_size){
589
written = 0;
590
while(written < (size_t) decrypted_buffer_size){
489
591
ret = (int)fwrite (decrypted_buffer + written, 1,
490
592
(size_t)decrypted_buffer_size - written,
491
593
stdout);
504
606
retval = -1;
505
607
}
506
608
}
507
508
//shutdown procedure
509
510
if(debug){
511
fprintf(stderr, "Closing TLS session\n");
512
}
513
609
610
/* Shutdown procedure */
611
612
mandos_end:
514
613
free(buffer);
515
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
516
exit:
517
614
close(tcp_sd);
518
gnutls_deinit (es.session);
519
gnutls_certificate_free_credentials (es.cred);
520
gnutls_global_deinit ();
615
gnutls_deinit (session);
521
616
return retval;
522
617
}
523
618
524
static AvahiSimplePoll *simple_poll = NULL;
525
static AvahiServer *server = NULL;
526
527
static void resolve_callback(
528
AvahiSServiceResolver *r,
529
AvahiIfIndex interface,
530
AVAHI_GCC_UNUSED AvahiProtocol protocol,
531
AvahiResolverEvent event,
532
const char *name,
533
const char *type,
534
const char *domain,
535
const char *host_name,
536
const AvahiAddress *address,
537
uint16_t port,
538
AVAHI_GCC_UNUSED AvahiStringList *txt,
539
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
540
AVAHI_GCC_UNUSED void* userdata) {
541
619
static void resolve_callback(AvahiSServiceResolver *r,
620
AvahiIfIndex interface,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
622
AvahiResolverEvent event,
623
const char *name,
624
const char *type,
625
const char *domain,
626
const char *host_name,
627
const AvahiAddress *address,
628
uint16_t port,
629
AVAHI_GCC_UNUSED AvahiStringList *txt,
630
AVAHI_GCC_UNUSED AvahiLookupResultFlags
631
flags,
632
void* userdata) {
633
mandos_context *mc = userdata;
542
634
assert(r); /* Spurious warning */
543
635
544
636
/* Called whenever a service has been resolved successfully or
547
639
switch (event) {
548
640
default:
549
641
case AVAHI_RESOLVER_FAILURE:
550
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
551
" type '%s' in domain '%s': %s\n", name, type, domain,
552
avahi_strerror(avahi_server_errno(server)));
642
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
643
" of type '%s' in domain '%s': %s\n", name, type, domain,
644
avahi_strerror(avahi_server_errno(mc->server)));
553
645
break;
554
646
555
647
case AVAHI_RESOLVER_FOUND:
557
649
char ip[AVAHI_ADDRESS_STR_MAX];
558
650
avahi_address_snprint(ip, sizeof(ip), address);
559
651
if(debug){
560
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
561
" port %d\n", name, host_name, ip, port);
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
562
654
}
563
int ret = start_mandos_communication(ip, port,
564
(unsigned int) interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
565
656
if (ret == 0){
566
657
exit(EXIT_SUCCESS);
567
658
}
570
661
avahi_s_service_resolver_free(r);
571
662
}
572
663
573
static void browse_callback(
574
AvahiSServiceBrowser *b,
575
AvahiIfIndex interface,
576
AvahiProtocol protocol,
577
AvahiBrowserEvent event,
578
const char *name,
579
const char *type,
580
const char *domain,
581
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
582
void* userdata) {
583
584
AvahiServer *s = userdata;
585
assert(b); /* Spurious warning */
586
587
/* Called whenever a new services becomes available on the LAN or
588
is removed from the LAN */
589
590
switch (event) {
591
default:
592
case AVAHI_BROWSER_FAILURE:
593
594
fprintf(stderr, "(Browser) %s\n",
595
avahi_strerror(avahi_server_errno(server)));
596
avahi_simple_poll_quit(simple_poll);
597
return;
598
599
case AVAHI_BROWSER_NEW:
600
/* We ignore the returned resolver object. In the callback
601
function we free it. If the server is terminated before
602
the callback function is called the server will free
603
the resolver for us. */
604
605
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
606
type, domain,
607
AVAHI_PROTO_INET6, 0,
608
resolve_callback, s)))
609
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
610
avahi_strerror(avahi_server_errno(s)));
611
break;
612
613
case AVAHI_BROWSER_REMOVE:
614
break;
615
616
case AVAHI_BROWSER_ALL_FOR_NOW:
617
case AVAHI_BROWSER_CACHE_EXHAUSTED:
618
break;
664
static void browse_callback( AvahiSServiceBrowser *b,
665
AvahiIfIndex interface,
666
AvahiProtocol protocol,
667
AvahiBrowserEvent event,
668
const char *name,
669
const char *type,
670
const char *domain,
671
AVAHI_GCC_UNUSED AvahiLookupResultFlags
672
flags,
673
void* userdata) {
674
mandos_context *mc = userdata;
675
assert(b); /* Spurious warning */
676
677
/* Called whenever a new services becomes available on the LAN or
678
is removed from the LAN */
679
680
switch (event) {
681
default:
682
case AVAHI_BROWSER_FAILURE:
683
684
fprintf(stderr, "(Avahi browser) %s\n",
685
avahi_strerror(avahi_server_errno(mc->server)));
686
avahi_simple_poll_quit(mc->simple_poll);
687
return;
688
689
case AVAHI_BROWSER_NEW:
690
/* We ignore the returned Avahi resolver object. In the callback
691
function we free it. If the Avahi server is terminated before
692
the callback function is called the Avahi server will free the
693
resolver for us. */
694
695
if (!(avahi_s_service_resolver_new(mc->server, interface,
696
protocol, name, type, domain,
697
AVAHI_PROTO_INET6, 0,
698
resolve_callback, mc)))
699
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
700
name, avahi_strerror(avahi_server_errno(mc->server)));
701
break;
702
703
case AVAHI_BROWSER_REMOVE:
704
break;
705
706
case AVAHI_BROWSER_ALL_FOR_NOW:
707
case AVAHI_BROWSER_CACHE_EXHAUSTED:
708
if(debug){
709
fprintf(stderr, "No Mandos server found, still searching...\n");
619
710
}
711
break;
712
}
620
713
}
621
714
622
/* combinds two strings and returns the malloced new string. som sane checks could/should be added */
623
const char *combinestrings(const char *first, const char *second){
624
char *tmp;
625
tmp = malloc(strlen(first) + strlen(second));
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
626
721
if (tmp == NULL){
627
perror("malloc");
628
722
return NULL;
629
723
}
630
strcpy(tmp, first);
631
strcat(tmp, second);
724
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
726
}
727
tmp[f_len] = '/';
728
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
730
}
731
tmp[f_len + 1 + s_len] = '\0';
632
732
return tmp;
633
733
}
634
734
635
735
636
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
637
AvahiServerConfig config;
736
int main(int argc, char *argv[]){
638
737
AvahiSServiceBrowser *sb = NULL;
639
738
int error;
640
739
int ret;
641
int returncode = EXIT_SUCCESS;
740
int exitcode = EXIT_SUCCESS;
642
741
const char *interface = "eth0";
643
644
while (true){
645
static struct option long_options[] = {
646
{"debug", no_argument, (int *)&debug, 1},
647
{"interface", required_argument, 0, 'i'},
648
{"certdir", required_argument, 0, 'd'},
649
{"certkey", required_argument, 0, 'c'},
650
{"certfile", required_argument, 0, 'k'},
651
{0, 0, 0, 0} };
652
653
int option_index = 0;
654
ret = getopt_long (argc, argv, "i:", long_options,
655
&option_index);
656
657
if (ret == -1){
658
break;
659
}
660
661
switch(ret){
662
case 0:
663
break;
664
case 'i':
665
interface = optarg;
666
break;
667
case 'd':
668
certdir = optarg;
669
break;
670
case 'c':
671
certfile = optarg;
672
break;
673
case 'k':
674
certkey = optarg;
675
break;
676
default:
677
exit(EXIT_FAILURE);
678
}
679
}
680
681
certfile = combinestrings(certdir, certfile);
682
if (certfile == NULL){
683
goto exit;
684
}
685
686
certkey = combinestrings(certdir, certkey);
687
if (certkey == NULL){
688
goto exit;
689
}
690
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
876
if(if_index == 0){
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
878
exit(EXIT_FAILURE);
879
}
880
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
885
if(address == NULL){
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
errno = 0;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
if(errno){
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
*address = '\0';
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
900
if(ret < 0){
901
exitcode = EXIT_FAILURE;
902
} else {
903
exitcode = EXIT_SUCCESS;
904
}
905
goto end;
906
}
907
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
918
if(ret == -1){
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
926
if(ret == -1){
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
929
goto end;
930
}
931
}
932
close(sd);
933
}
934
691
935
if (not debug){
692
936
avahi_set_log_function(empty_log);
693
937
}
694
938
695
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
696
940
srand((unsigned int) time(NULL));
697
698
/* Allocate main loop object */
699
if (!(simple_poll = avahi_simple_poll_new())) {
700
fprintf(stderr, "Failed to create simple poll object.\n");
701
702
goto exit;
703
}
704
705
/* Do not publish any local records */
706
avahi_server_config_init(&config);
707
config.publish_hinfo = 0;
708
config.publish_addresses = 0;
709
config.publish_workstation = 0;
710
config.publish_domain = 0;
711
712
/* Allocate a new server */
713
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
714
&config, NULL, NULL, &error);
715
716
/* Free the configuration data */
717
avahi_server_config_free(&config);
718
719
/* Check if creating the server object succeeded */
720
if (!server) {
721
fprintf(stderr, "Failed to create server: %s\n",
941
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
946
" object.\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
{
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
959
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
963
NULL, &error);
964
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
967
}
968
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
722
972
avahi_strerror(error));
723
returncode = EXIT_FAILURE;
724
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
725
975
}
726
976
727
/* Create the service browser */
728
sb = avahi_s_service_browser_new(server,
729
(AvahiIfIndex)
730
if_nametoindex(interface),
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
731
979
AVAHI_PROTO_INET6,
732
980
"_mandos._tcp", NULL, 0,
733
browse_callback, server);
734
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
735
983
fprintf(stderr, "Failed to create service browser: %s\n",
736
avahi_strerror(avahi_server_errno(server)));
737
returncode = EXIT_FAILURE;
738
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
739
987
}
740
988
741
989
/* Run the main loop */
742
990
743
991
if (debug){
744
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
745
993
}
746
994
747
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
748
996
749
exit:
997
end:
750
998
751
999
if (debug){
752
1000
fprintf(stderr, "%s exiting\n", argv[0]);
753
1001
}
754
1002
755
1003
/* Cleanup things */
756
if (sb)
1004
if (sb != NULL)
757
1005
avahi_s_service_browser_free(sb);
758
1006
759
if (server)
760
avahi_server_free(server);
761
762
if (simple_poll)
763
avahi_simple_poll_free(simple_poll);
764
765
return returncode;
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1009
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1012
free(pubkeyfile);
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
1019
1020
return exitcode;
766
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0