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- Committer: Björn Påhlsson
- Date: 2008-08-04 21:27:53 UTC
- mfrom: (45 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 46.
- Revision ID: belorn@braxen-20080804212753-rdghixnyfxb7w3u5
merge
- files added:
- server.conf
- 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, 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 */
65
66
// 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 */
67
72
#include <errno.h> /* perror() */
68
73
#include <gpgme.h>
69
74
70
// getopt long
71
#include <getopt.h>
72
73
75
#define BUFFER_SIZE 256
74
#define DH_BITS 1024
75
76
const char *certdir = "/conf/conf.d/cryptkeyreq/";
77
const char *certfile = "openpgp-client.txt";
78
const char *certkey = "openpgp-client-key.txt";
79
76
80
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>";
81
82
83
/* Used for passing in values through the Avahi callback functions */
82
84
typedef struct {
83
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
84
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
85
89
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){
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){
91
118
gpgme_data_t dh_crypto, dh_plain;
92
119
gpgme_ctx_t ctx;
93
120
gpgme_error_t rc;
94
121
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
97
124
gpgme_engine_info_t engine_info;
98
125
99
126
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
101
128
}
102
129
103
130
/* Init GPGME */
109
136
return -1;
110
137
}
111
138
112
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
113
140
rc = gpgme_get_engine_info (&engine_info);
114
141
if (rc != GPG_ERR_NO_ERROR){
115
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
125
152
engine_info = engine_info->next;
126
153
}
127
154
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
129
156
return -1;
130
157
}
131
158
132
/* Create new GPGME data buffer from packet buffer */
133
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);
134
162
if (rc != GPG_ERR_NO_ERROR){
135
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
164
gpgme_strsource(rc), gpgme_strerror(rc));
142
170
if (rc != GPG_ERR_NO_ERROR){
143
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
144
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
145
174
return -1;
146
175
}
147
176
150
179
if (rc != GPG_ERR_NO_ERROR){
151
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
181
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
154
184
}
155
185
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
158
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
189
if (rc != GPG_ERR_NO_ERROR){
160
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
161
191
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
163
194
}
164
195
165
196
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
167
198
}
168
199
169
200
if (debug){
170
201
gpgme_decrypt_result_t result;
171
202
result = gpgme_op_decrypt_result(ctx);
195
226
}
196
227
}
197
228
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
200
201
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
204
234
}
205
235
206
*new_packet = 0;
236
*plaintext = NULL;
207
237
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;
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;
217
245
}
218
246
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
248
BUFFER_SIZE);
221
249
/* Print the data, if any */
222
250
if (ret == 0){
251
/* EOF */
223
252
break;
224
253
}
225
254
if(ret < 0){
226
255
perror("gpgme_data_read");
227
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
228
258
}
229
new_packet_length += ret;
259
plaintext_length += ret;
230
260
}
231
261
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
/* } */
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);
239
274
240
275
/* Delete the GPGME plaintext data buffer */
241
276
gpgme_data_release(dh_plain);
242
return new_packet_length;
277
return plaintext_length;
243
278
}
244
279
245
280
static const char * safer_gnutls_strerror (int value) {
249
284
return ret;
250
285
}
251
286
252
void debuggnutls(__attribute__((unused)) int level,
253
const char* string){
254
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);
255
291
}
256
292
257
int initgnutls(encrypted_session *es){
258
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
259
296
int ret;
260
297
261
298
if(debug){
264
301
265
302
if ((ret = gnutls_global_init ())
266
303
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
268
306
return -1;
269
307
}
270
308
271
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
272
313
gnutls_global_set_log_level(11);
273
314
gnutls_global_set_log_function(debuggnutls);
274
315
}
275
316
276
/* openpgp credentials */
277
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
278
319
!= GNUTLS_E_SUCCESS) {
279
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
280
321
safer_gnutls_strerror(ret));
281
322
return -1;
282
323
}
283
324
284
325
if(debug){
285
326
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
286
" and keyfile %s as GnuTLS credentials\n", certfile,
287
certkey);
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
288
329
}
289
330
290
331
ret = gnutls_certificate_set_openpgp_key_file
291
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
292
333
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",
334
fprintf(stderr,
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
298
338
safer_gnutls_strerror(ret));
299
339
return -1;
300
340
}
301
341
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){
342
/* GnuTLS server initialization */
343
ret = gnutls_dh_params_init(&mc->dh_params);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
347
return -1;
348
}
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
353
return -1;
354
}
355
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
357
358
return 0;
359
}
360
361
static int init_gnutls_session(mandos_context *mc,
362
gnutls_session_t *session){
363
int ret;
364
/* GnuTLS session creation */
365
ret = gnutls_init(session, GNUTLS_SERVER);
366
if (ret != GNUTLS_E_SUCCESS){
322
367
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
323
368
safer_gnutls_strerror(ret));
324
369
}
325
370
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;
371
{
372
const char *err;
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf(stderr, "Syntax error at: %s\n", err);
376
fprintf(stderr, "GnuTLS error: %s\n",
377
safer_gnutls_strerror(ret));
378
return -1;
379
}
332
380
}
333
381
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",
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
383
mc->cred);
384
if (ret != GNUTLS_E_SUCCESS) {
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
338
386
safer_gnutls_strerror(ret));
339
387
return -1;
340
388
}
341
389
342
390
/* ignore client certificate if any. */
343
gnutls_certificate_server_set_request (es->session,
391
gnutls_certificate_server_set_request (*session,
344
392
GNUTLS_CERT_IGNORE);
345
393
346
gnutls_dh_set_prime_bits (es->session, DH_BITS);
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
347
395
348
396
return 0;
349
397
}
350
398
351
void empty_log(__attribute__((unused)) AvahiLogLevel level,
352
__attribute__((unused)) const char *txt){}
399
/* Avahi log function callback */
400
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
401
__attribute__((unused)) const char *txt){}
353
402
354
int start_mandos_communication(const char *ip, uint16_t port,
355
unsigned int if_index){
403
/* Called when a Mandos server is found */
404
static int start_mandos_communication(const char *ip, uint16_t port,
405
AvahiIfIndex if_index,
406
mandos_context *mc){
356
407
int ret, tcp_sd;
357
struct sockaddr_in6 to;
358
encrypted_session es;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
359
409
char *buffer = NULL;
360
410
char *decrypted_buffer;
361
411
size_t buffer_length = 0;
362
412
size_t buffer_capacity = 0;
363
413
ssize_t decrypted_buffer_size;
364
size_t written = 0;
414
size_t written;
365
415
int retval = 0;
366
416
char interface[IF_NAMESIZE];
417
gnutls_session_t session;
418
419
ret = init_gnutls_session (mc, &session);
420
if (ret != 0){
421
return -1;
422
}
367
423
368
424
if(debug){
369
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
425
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
426
ip, port);
370
427
}
371
428
372
429
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
376
433
}
377
434
378
435
if(debug){
379
if(if_indextoname(if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
437
perror("if_indextoname");
383
438
return -1;
384
439
}
385
386
440
fprintf(stderr, "Binding to interface %s\n", interface);
387
441
}
388
442
389
443
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
444
to.in6.sin6_family = AF_INET6;
445
/* It would be nice to have a way to detect if we were passed an
446
IPv4 address here. Now we assume an IPv6 address. */
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
392
448
if (ret < 0 ){
393
449
perror("inet_pton");
394
450
return -1;
395
}
451
}
396
452
if(ret == 0){
397
453
fprintf(stderr, "Bad address: %s\n", ip);
398
454
return -1;
399
455
}
400
to.sin6_port = htons(port); /* Spurious warning */
456
to.in6.sin6_port = htons(port); /* Spurious warning */
401
457
402
to.sin6_scope_id = (uint32_t)if_index;
458
to.in6.sin6_scope_id = (uint32_t)if_index;
403
459
404
460
if(debug){
405
fprintf(stderr, "Connection to: %s\n", ip);
461
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
462
char addrstr[INET6_ADDRSTRLEN] = "";
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
464
sizeof(addrstr)) == NULL){
465
perror("inet_ntop");
466
} else {
467
if(strcmp(addrstr, ip) != 0){
468
fprintf(stderr, "Canonical address form: %s\n", addrstr);
469
}
470
}
406
471
}
407
472
408
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
473
ret = connect(tcp_sd, &to.in, sizeof(to));
409
474
if (ret < 0){
410
475
perror("connect");
411
476
return -1;
412
477
}
413
414
ret = initgnutls (&es);
415
if (ret != 0){
416
retval = -1;
417
return -1;
478
479
const char *out = mandos_protocol_version;
480
written = 0;
481
while (true){
482
size_t out_size = strlen(out);
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
484
out_size - written));
485
if (ret == -1){
486
perror("write");
487
retval = -1;
488
goto mandos_end;
489
}
490
written += (size_t)ret;
491
if(written < out_size){
492
continue;
493
} else {
494
if (out == mandos_protocol_version){
495
written = 0;
496
out = "\r\n";
497
} else {
498
break;
499
}
500
}
418
501
}
419
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
422
502
423
503
if(debug){
424
504
fprintf(stderr, "Establishing TLS session with %s\n", ip);
425
505
}
426
506
427
ret = gnutls_handshake (es.session);
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
428
510
429
511
if (ret != GNUTLS_E_SUCCESS){
430
512
if(debug){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
432
514
gnutls_perror (ret);
433
515
}
434
516
retval = -1;
435
goto exit;
517
goto mandos_end;
436
518
}
437
519
438
//Retrieve OpenPGP packet that contains the wanted password
520
/* Read OpenPGP packet that contains the wanted password */
439
521
440
522
if(debug){
441
523
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
443
525
}
444
526
445
527
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;
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
529
buffer_capacity);
530
if (buffer_capacity == 0){
531
perror("adjustbuffer");
532
retval = -1;
533
goto mandos_end;
453
534
}
454
535
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
457
538
if (ret == 0){
458
539
break;
459
540
}
463
544
case GNUTLS_E_AGAIN:
464
545
break;
465
546
case GNUTLS_E_REHANDSHAKE:
466
ret = gnutls_handshake (es.session);
547
ret = gnutls_handshake (session);
467
548
if (ret < 0){
468
fprintf(stderr, "\n*** Handshake failed ***\n");
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
469
550
gnutls_perror (ret);
470
551
retval = -1;
471
goto exit;
552
goto mandos_end;
472
553
}
473
554
break;
474
555
default:
475
556
fprintf(stderr, "Unknown error while reading data from"
476
" encrypted session with mandos server\n");
557
" encrypted session with Mandos server\n");
477
558
retval = -1;
478
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
479
goto exit;
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
560
goto mandos_end;
480
561
}
481
562
} else {
482
563
buffer_length += (size_t) ret;
483
564
}
484
565
}
485
566
567
if(debug){
568
fprintf(stderr, "Closing TLS session\n");
569
}
570
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
572
486
573
if (buffer_length > 0){
487
574
decrypted_buffer_size = pgp_packet_decrypt(buffer,
488
575
buffer_length,
489
576
&decrypted_buffer,
490
certdir);
577
keydir);
491
578
if (decrypted_buffer_size >= 0){
492
while(written < (size_t)decrypted_buffer_size){
579
written = 0;
580
while(written < (size_t) decrypted_buffer_size){
493
581
ret = (int)fwrite (decrypted_buffer + written, 1,
494
582
(size_t)decrypted_buffer_size - written,
495
583
stdout);
508
596
retval = -1;
509
597
}
510
598
}
511
512
//shutdown procedure
513
514
if(debug){
515
fprintf(stderr, "Closing TLS session\n");
516
}
517
599
600
/* Shutdown procedure */
601
602
mandos_end:
518
603
free(buffer);
519
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
520
exit:
521
604
close(tcp_sd);
522
gnutls_deinit (es.session);
523
gnutls_certificate_free_credentials (es.cred);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
524
607
gnutls_global_deinit ();
525
608
return retval;
526
609
}
527
610
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
611
static void resolve_callback(AvahiSServiceResolver *r,
612
AvahiIfIndex interface,
613
AVAHI_GCC_UNUSED AvahiProtocol protocol,
614
AvahiResolverEvent event,
615
const char *name,
616
const char *type,
617
const char *domain,
618
const char *host_name,
619
const AvahiAddress *address,
620
uint16_t port,
621
AVAHI_GCC_UNUSED AvahiStringList *txt,
622
AVAHI_GCC_UNUSED AvahiLookupResultFlags
623
flags,
624
void* userdata) {
625
mandos_context *mc = userdata;
546
626
assert(r); /* Spurious warning */
547
627
548
628
/* Called whenever a service has been resolved successfully or
551
631
switch (event) {
552
632
default:
553
633
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)));
634
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
635
" of type '%s' in domain '%s': %s\n", name, type, domain,
636
avahi_strerror(avahi_server_errno(mc->server)));
557
637
break;
558
638
559
639
case AVAHI_RESOLVER_FOUND:
561
641
char ip[AVAHI_ADDRESS_STR_MAX];
562
642
avahi_address_snprint(ip, sizeof(ip), address);
563
643
if(debug){
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" port %d\n", name, host_name, ip, port);
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
566
646
}
567
int ret = start_mandos_communication(ip, port,
568
(unsigned int) interface);
647
int ret = start_mandos_communication(ip, port, interface, mc);
569
648
if (ret == 0){
570
649
exit(EXIT_SUCCESS);
571
650
}
574
653
avahi_s_service_resolver_free(r);
575
654
}
576
655
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;
656
static void browse_callback( AvahiSServiceBrowser *b,
657
AvahiIfIndex interface,
658
AvahiProtocol protocol,
659
AvahiBrowserEvent event,
660
const char *name,
661
const char *type,
662
const char *domain,
663
AVAHI_GCC_UNUSED AvahiLookupResultFlags
664
flags,
665
void* userdata) {
666
mandos_context *mc = userdata;
667
assert(b); /* Spurious warning */
668
669
/* Called whenever a new services becomes available on the LAN or
670
is removed from the LAN */
671
672
switch (event) {
673
default:
674
case AVAHI_BROWSER_FAILURE:
675
676
fprintf(stderr, "(Avahi browser) %s\n",
677
avahi_strerror(avahi_server_errno(mc->server)));
678
avahi_simple_poll_quit(mc->simple_poll);
679
return;
680
681
case AVAHI_BROWSER_NEW:
682
/* We ignore the returned Avahi resolver object. In the callback
683
function we free it. If the Avahi server is terminated before
684
the callback function is called the Avahi server will free the
685
resolver for us. */
686
687
if (!(avahi_s_service_resolver_new(mc->server, interface,
688
protocol, name, type, domain,
689
AVAHI_PROTO_INET6, 0,
690
resolve_callback, mc)))
691
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
692
name, avahi_strerror(avahi_server_errno(mc->server)));
693
break;
694
695
case AVAHI_BROWSER_REMOVE:
696
break;
697
698
case AVAHI_BROWSER_ALL_FOR_NOW:
699
case AVAHI_BROWSER_CACHE_EXHAUSTED:
700
if(debug){
701
fprintf(stderr, "No Mandos server found, still searching...\n");
623
702
}
703
break;
704
}
624
705
}
625
706
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);
707
/* Combines file name and path and returns the malloced new
708
string. some sane checks could/should be added */
709
static const char *combinepath(const char *first, const char *second){
710
size_t f_len = strlen(first);
711
size_t s_len = strlen(second);
712
char *tmp = malloc(f_len + s_len + 2);
630
713
if (tmp == NULL){
631
perror("malloc");
632
714
return NULL;
633
715
}
634
strcpy(tmp, first);
635
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
636
strcat(tmp, "/");
637
}
638
strcat(tmp, second);
716
if(f_len > 0){
717
memcpy(tmp, first, f_len); /* Spurious warning */
718
}
719
tmp[f_len] = '/';
720
if(s_len > 0){
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
722
}
723
tmp[f_len + 1 + s_len] = '\0';
639
724
return tmp;
640
725
}
641
726
642
727
643
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
644
AvahiServerConfig config;
728
int main(int argc, char *argv[]){
645
729
AvahiSServiceBrowser *sb = NULL;
646
730
int error;
647
731
int ret;
648
int returncode = EXIT_SUCCESS;
732
int exitcode = EXIT_SUCCESS;
649
733
const char *interface = "eth0";
650
734
struct ifreq network;
651
735
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);
736
uid_t uid;
737
gid_t gid;
738
char *connect_to = NULL;
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
743
.dh_bits = 1024, .priority = "SECURE256"};
744
745
{
746
struct argp_option options[] = {
747
{ .name = "debug", .key = 128,
748
.doc = "Debug mode", .group = 3 },
749
{ .name = "connect", .key = 'c',
750
.arg = "IP",
751
.doc = "Connect directly to a sepcified mandos server",
752
.group = 1 },
753
{ .name = "interface", .key = 'i',
754
.arg = "INTERFACE",
755
.doc = "Interface that Avahi will conntect through",
756
.group = 1 },
757
{ .name = "keydir", .key = 'd',
758
.arg = "KEYDIR",
759
.doc = "Directory where the openpgp keyring is",
760
.group = 1 },
761
{ .name = "seckey", .key = 's',
762
.arg = "SECKEY",
763
.doc = "Secret openpgp key for gnutls authentication",
764
.group = 1 },
765
{ .name = "pubkey", .key = 'p',
766
.arg = "PUBKEY",
767
.doc = "Public openpgp key for gnutls authentication",
768
.group = 2 },
769
{ .name = "dh-bits", .key = 129,
770
.arg = "BITS",
771
.doc = "dh-bits to use in gnutls communication",
772
.group = 2 },
773
{ .name = "priority", .key = 130,
774
.arg = "PRIORITY",
775
.doc = "GNUTLS priority", .group = 1 },
776
{ .name = NULL }
777
};
778
779
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
784
switch (key) {
785
case 128:
786
debug = true;
787
break;
788
case 'c':
789
connect_to = arg;
790
break;
791
case 'i':
792
interface = arg;
793
break;
794
case 'd':
795
keydir = arg;
796
break;
797
case 's':
798
seckeyfile = arg;
799
break;
800
case 'p':
801
pubkeyfile = arg;
802
break;
803
case 129:
804
errno = 0;
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
if (errno){
807
perror("strtol");
808
exit(EXIT_FAILURE);
809
}
810
break;
811
case 130:
812
mc.priority = arg;
813
break;
814
case ARGP_KEY_ARG:
815
argp_usage (state);
816
break;
817
case ARGP_KEY_END:
818
break;
819
default:
820
return ARGP_ERR_UNKNOWN;
821
}
822
return 0;
823
}
824
825
struct argp argp = { .options = options, .parser = parse_opt,
826
.args_doc = "",
827
.doc = "Mandos client -- Get and decrypt"
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
}
831
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
835
exitcode = EXIT_FAILURE;
836
goto end;
837
}
838
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
842
goto end;
843
}
844
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
846
if (ret == -1){
847
fprintf(stderr, "init_gnutls_global\n");
848
goto end;
849
}
850
851
uid = getuid();
852
gid = getgid();
853
854
ret = setuid(uid);
855
if (ret == -1){
856
perror("setuid");
857
}
858
859
setgid(gid);
860
if (ret == -1){
861
perror("setgid");
862
}
863
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
865
if(if_index == 0){
866
fprintf(stderr, "No such interface: \"%s\"\n", interface);
867
exit(EXIT_FAILURE);
868
}
869
870
if(connect_to != NULL){
871
/* Connect directly, do not use Zeroconf */
872
/* (Mainly meant for debugging) */
873
char *address = strrchr(connect_to, ':');
874
if(address == NULL){
875
fprintf(stderr, "No colon in address\n");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
errno = 0;
880
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
881
if(errno){
882
perror("Bad port number");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
*address = '\0';
887
address = connect_to;
888
ret = start_mandos_communication(address, port, if_index, &mc);
889
if(ret < 0){
890
exitcode = EXIT_FAILURE;
891
} else {
892
exitcode = EXIT_SUCCESS;
893
}
894
goto end;
895
}
896
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
719
907
if(ret == -1){
720
perror("ioctl SIOCSIFFLAGS");
721
returncode = EXIT_FAILURE;
722
goto exit;
723
}
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
724
922
}
725
close(sd);
726
923
727
924
if (not debug){
728
925
avahi_set_log_function(empty_log);
729
926
}
730
927
731
/* Initialize the psuedo-RNG */
928
/* Initialize the pseudo-RNG for Avahi */
732
929
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",
930
931
/* Allocate main Avahi loop object */
932
mc.simple_poll = avahi_simple_poll_new();
933
if (mc.simple_poll == NULL) {
934
fprintf(stderr, "Avahi: Failed to create simple poll"
935
" object.\n");
936
exitcode = EXIT_FAILURE;
937
goto end;
938
}
939
940
{
941
AvahiServerConfig config;
942
/* Do not publish any local Zeroconf records */
943
avahi_server_config_init(&config);
944
config.publish_hinfo = 0;
945
config.publish_addresses = 0;
946
config.publish_workstation = 0;
947
config.publish_domain = 0;
948
949
/* Allocate a new server */
950
mc.server = avahi_server_new(avahi_simple_poll_get
951
(mc.simple_poll), &config, NULL,
952
NULL, &error);
953
954
/* Free the Avahi configuration data */
955
avahi_server_config_free(&config);
956
}
957
958
/* Check if creating the Avahi server object succeeded */
959
if (mc.server == NULL) {
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
758
961
avahi_strerror(error));
759
returncode = EXIT_FAILURE;
760
goto exit;
962
exitcode = EXIT_FAILURE;
963
goto end;
761
964
}
762
965
763
/* Create the service browser */
764
sb = avahi_s_service_browser_new(server,
765
(AvahiIfIndex)
766
if_nametoindex(interface),
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
767
968
AVAHI_PROTO_INET6,
768
969
"_mandos._tcp", NULL, 0,
769
browse_callback, server);
770
if (!sb) {
970
browse_callback, &mc);
971
if (sb == NULL) {
771
972
fprintf(stderr, "Failed to create service browser: %s\n",
772
avahi_strerror(avahi_server_errno(server)));
773
returncode = EXIT_FAILURE;
774
goto exit;
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
775
976
}
776
977
777
978
/* Run the main loop */
778
979
779
980
if (debug){
780
fprintf(stderr, "Starting avahi loop search\n");
981
fprintf(stderr, "Starting Avahi loop search\n");
781
982
}
782
983
783
avahi_simple_poll_loop(simple_poll);
984
avahi_simple_poll_loop(mc.simple_poll);
784
985
785
exit:
986
end:
786
987
787
988
if (debug){
788
989
fprintf(stderr, "%s exiting\n", argv[0]);
789
990
}
790
991
791
992
/* Cleanup things */
792
if (sb)
993
if (sb != NULL)
793
994
avahi_s_service_browser_free(sb);
794
995
795
if (server)
796
avahi_server_free(server);
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
797
998
798
if (simple_poll)
799
avahi_simple_poll_free(simple_poll);
800
free(certfile);
801
free(certkey);
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
802
1003
803
return returncode;
1004
return exitcode;
804
1005
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0