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 45
- compare with another revision
- download diff
- download tarball
- view history from revision 45
- Committer: Teddy Hogeborn
- Date: 2008-08-04 21:25:55 UTC
- Revision ID: teddy@fukt.bsnet.se-20080804212555-rm7xxjze65f8avy3
* server.py: Cosmetic changes.
added
removed
plugins.d/mandosclient.c
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
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
36
37
#include <stdio.h>
37
38
#include <assert.h>
38
39
#include <stdlib.h>
39
40
#include <time.h>
40
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 */
41
46
42
47
#include <avahi-core/core.h>
43
48
#include <avahi-core/lookup.h>
46
51
#include <avahi-common/malloc.h>
47
52
#include <avahi-common/error.h>
48
53
49
//mandos client part
54
/* Mandos client part */
50
55
#include <sys/types.h> /* socket(), inet_pton() */
51
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
52
57
struct in6_addr, inet_pton() */
59
64
#include <string.h> /* memset */
60
65
#include <arpa/inet.h> /* inet_pton() */
61
66
#include <iso646.h> /* not */
62
63
// 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 */
64
72
#include <errno.h> /* perror() */
65
73
#include <gpgme.h>
66
74
67
// getopt long
68
#include <getopt.h>
69
70
#ifndef CERT_ROOT
71
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
72
#endif
73
#define CERTFILE CERT_ROOT "openpgp-client.txt"
74
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
75
75
#define BUFFER_SIZE 256
76
#define DH_BITS 1024
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 */
102
131
gpgme_check_version(NULL);
103
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
137
}
104
138
105
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
106
140
rc = gpgme_get_engine_info (&engine_info);
107
141
if (rc != GPG_ERR_NO_ERROR){
108
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
118
152
engine_info = engine_info->next;
119
153
}
120
154
if(engine_info == NULL){
121
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
122
156
return -1;
123
157
}
124
158
125
/* Create new GPGME data buffer from packet buffer */
126
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);
127
162
if (rc != GPG_ERR_NO_ERROR){
128
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
129
164
gpgme_strsource(rc), gpgme_strerror(rc));
135
170
if (rc != GPG_ERR_NO_ERROR){
136
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
137
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
138
174
return -1;
139
175
}
140
176
143
179
if (rc != GPG_ERR_NO_ERROR){
144
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
145
181
gpgme_strsource(rc), gpgme_strerror(rc));
146
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
147
184
}
148
185
149
/* Decrypt data from the FILE pointer to the plaintext data
150
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
151
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
152
189
if (rc != GPG_ERR_NO_ERROR){
153
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
154
191
gpgme_strsource(rc), gpgme_strerror(rc));
155
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
156
194
}
157
195
158
196
if(debug){
159
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
160
198
}
161
199
162
200
if (debug){
163
201
gpgme_decrypt_result_t result;
164
202
result = gpgme_op_decrypt_result(ctx);
188
226
}
189
227
}
190
228
191
/* Delete the GPGME FILE pointer cryptotext data buffer */
192
gpgme_data_release(dh_crypto);
193
194
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
195
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
196
197
*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;
198
237
while(true){
199
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
200
*new_packet = realloc(*new_packet,
201
(unsigned int)new_packet_capacity
202
+ BUFFER_SIZE);
203
if (*new_packet == NULL){
204
perror("realloc");
205
return -1;
206
}
207
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;
208
245
}
209
246
210
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
211
248
BUFFER_SIZE);
212
249
/* Print the data, if any */
213
250
if (ret == 0){
251
/* EOF */
214
252
break;
215
253
}
216
254
if(ret < 0){
217
255
perror("gpgme_data_read");
218
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
219
258
}
220
new_packet_length += ret;
259
plaintext_length += ret;
221
260
}
222
261
223
/* FIXME: check characters before printing to screen so to not print
224
terminal control characters */
225
/* if(debug){ */
226
/* fprintf(stderr, "decrypted password is: "); */
227
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
228
/* fprintf(stderr, "\n"); */
229
/* } */
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);
230
274
231
275
/* Delete the GPGME plaintext data buffer */
232
276
gpgme_data_release(dh_plain);
233
return new_packet_length;
277
return plaintext_length;
234
278
}
235
279
236
280
static const char * safer_gnutls_strerror (int value) {
240
284
return ret;
241
285
}
242
286
243
void debuggnutls(__attribute__((unused)) int level,
244
const char* string){
245
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);
246
291
}
247
292
248
int initgnutls(encrypted_session *es){
249
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
250
296
int ret;
251
297
252
298
if(debug){
253
299
fprintf(stderr, "Initializing GnuTLS\n");
254
300
}
255
301
256
302
if ((ret = gnutls_global_init ())
257
303
!= GNUTLS_E_SUCCESS) {
258
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
259
306
return -1;
260
307
}
261
308
262
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
263
313
gnutls_global_set_log_level(11);
264
314
gnutls_global_set_log_function(debuggnutls);
265
315
}
266
316
267
/* openpgp credentials */
268
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
269
319
!= GNUTLS_E_SUCCESS) {
270
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
271
321
safer_gnutls_strerror(ret));
272
322
return -1;
273
323
}
274
324
275
325
if(debug){
276
326
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
277
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
278
KEYFILE);
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
279
329
}
280
330
281
331
ret = gnutls_certificate_set_openpgp_key_file
282
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
283
333
if (ret != GNUTLS_E_SUCCESS) {
284
fprintf
285
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
286
" '%s')\n",
287
ret, CERTFILE, KEYFILE);
288
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",
289
338
safer_gnutls_strerror(ret));
290
339
return -1;
291
340
}
292
341
293
//GnuTLS server initialization
294
if ((ret = gnutls_dh_params_init (&es->dh_params))
295
!= GNUTLS_E_SUCCESS) {
296
fprintf (stderr, "Error in dh parameter initialization: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in prime generation: %s\n",
304
safer_gnutls_strerror(ret));
305
return -1;
306
}
307
308
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
309
310
// GnuTLS session creation
311
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
312
!= 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){
313
367
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
314
368
safer_gnutls_strerror(ret));
315
369
}
316
370
317
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
318
!= GNUTLS_E_SUCCESS) {
319
fprintf(stderr, "Syntax error at: %s\n", err);
320
fprintf(stderr, "GnuTLS error: %s\n",
321
safer_gnutls_strerror(ret));
322
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
}
323
380
}
324
381
325
if ((ret = gnutls_credentials_set
326
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
327
!= GNUTLS_E_SUCCESS) {
328
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",
329
386
safer_gnutls_strerror(ret));
330
387
return -1;
331
388
}
332
389
333
390
/* ignore client certificate if any. */
334
gnutls_certificate_server_set_request (es->session,
391
gnutls_certificate_server_set_request (*session,
335
392
GNUTLS_CERT_IGNORE);
336
393
337
gnutls_dh_set_prime_bits (es->session, DH_BITS);
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
338
395
339
396
return 0;
340
397
}
341
398
342
void empty_log(__attribute__((unused)) AvahiLogLevel level,
343
__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){}
344
402
345
int start_mandos_communication(const char *ip, uint16_t port,
346
AvahiIfIndex 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){
347
407
int ret, tcp_sd;
348
struct sockaddr_in6 to;
349
encrypted_session es;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
350
409
char *buffer = NULL;
351
410
char *decrypted_buffer;
352
411
size_t buffer_length = 0;
353
412
size_t buffer_capacity = 0;
354
413
ssize_t decrypted_buffer_size;
355
size_t written = 0;
414
size_t written;
356
415
int retval = 0;
357
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
}
358
423
359
424
if(debug){
360
425
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
366
431
perror("socket");
367
432
return -1;
368
433
}
369
370
if(if_indextoname((unsigned int)if_index, interface) == NULL){
371
if(debug){
434
435
if(debug){
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
372
437
perror("if_indextoname");
438
return -1;
373
439
}
374
return -1;
375
}
376
377
if(debug){
378
440
fprintf(stderr, "Binding to interface %s\n", interface);
379
441
}
380
442
381
443
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
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);
384
448
if (ret < 0 ){
385
449
perror("inet_pton");
386
450
return -1;
387
}
451
}
388
452
if(ret == 0){
389
453
fprintf(stderr, "Bad address: %s\n", ip);
390
454
return -1;
391
455
}
392
to.sin6_port = htons(port); /* Spurious warning */
456
to.in6.sin6_port = htons(port); /* Spurious warning */
393
457
394
to.sin6_scope_id = (uint32_t)if_index;
458
to.in6.sin6_scope_id = (uint32_t)if_index;
395
459
396
460
if(debug){
397
461
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
398
/* char addrstr[INET6_ADDRSTRLEN]; */
399
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
400
/* sizeof(addrstr)) == NULL){ */
401
/* perror("inet_ntop"); */
402
/* } else { */
403
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
404
/* addrstr, ntohs(to.sin6_port)); */
405
/* } */
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
CERT_ROOT);
577
keydir);
491
578
if (decrypted_buffer_size >= 0){
579
written = 0;
492
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,
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, interface);
647
int ret = start_mandos_communication(ip, port, interface, mc);
568
648
if (ret == 0){
569
649
exit(EXIT_SUCCESS);
570
650
}
573
653
avahi_s_service_resolver_free(r);
574
654
}
575
655
576
static void browse_callback(
577
AvahiSServiceBrowser *b,
578
AvahiIfIndex interface,
579
AvahiProtocol protocol,
580
AvahiBrowserEvent event,
581
const char *name,
582
const char *type,
583
const char *domain,
584
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
585
void* userdata) {
586
587
AvahiServer *s = userdata;
588
assert(b); /* Spurious warning */
589
590
/* Called whenever a new services becomes available on the LAN or
591
is removed from the LAN */
592
593
switch (event) {
594
default:
595
case AVAHI_BROWSER_FAILURE:
596
597
fprintf(stderr, "(Browser) %s\n",
598
avahi_strerror(avahi_server_errno(server)));
599
avahi_simple_poll_quit(simple_poll);
600
return;
601
602
case AVAHI_BROWSER_NEW:
603
/* We ignore the returned resolver object. In the callback
604
function we free it. If the server is terminated before
605
the callback function is called the server will free
606
the resolver for us. */
607
608
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
609
type, domain,
610
AVAHI_PROTO_INET6, 0,
611
resolve_callback, s)))
612
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
613
avahi_strerror(avahi_server_errno(s)));
614
break;
615
616
case AVAHI_BROWSER_REMOVE:
617
break;
618
619
case AVAHI_BROWSER_ALL_FOR_NOW:
620
case AVAHI_BROWSER_CACHE_EXHAUSTED:
621
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");
622
702
}
623
}
624
625
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
626
AvahiServerConfig config;
703
break;
704
}
705
}
706
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);
713
if (tmp == NULL){
714
return NULL;
715
}
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';
724
return tmp;
725
}
726
727
728
int main(int argc, char *argv[]){
627
729
AvahiSServiceBrowser *sb = NULL;
628
730
int error;
629
731
int ret;
630
int returncode = EXIT_SUCCESS;
631
const char *interface = NULL;
732
int exitcode = EXIT_SUCCESS;
733
const char *interface = "eth0";
734
struct ifreq network;
735
int sd;
736
uid_t uid;
737
gid_t gid;
738
char *connect_to = NULL;
632
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
633
char *connect_to = NULL;
634
635
while (true){
636
static struct option long_options[] = {
637
{"debug", no_argument, (int *)&debug, 1},
638
{"connect", required_argument, 0, 'c'},
639
{"interface", required_argument, 0, 'i'},
640
{0, 0, 0, 0} };
641
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
644
&option_index);
645
646
if (ret == -1){
647
break;
648
}
649
650
switch(ret){
651
case 0:
652
break;
653
case 'i':
654
interface = optarg;
655
break;
656
case 'c':
657
connect_to = optarg;
658
break;
659
default:
660
exit(EXIT_FAILURE);
661
}
662
}
663
664
if(interface != NULL){
665
if_index = (AvahiIfIndex) if_nametoindex(interface);
666
if(if_index == 0){
667
fprintf(stderr, "No such interface: \"%s\"\n", interface);
668
exit(EXIT_FAILURE);
669
}
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);
670
868
}
671
869
672
870
if(connect_to != NULL){
675
873
char *address = strrchr(connect_to, ':');
676
874
if(address == NULL){
677
875
fprintf(stderr, "No colon in address\n");
678
exit(EXIT_FAILURE);
876
exitcode = EXIT_FAILURE;
877
goto end;
679
878
}
680
879
errno = 0;
681
880
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
682
881
if(errno){
683
882
perror("Bad port number");
684
exit(EXIT_FAILURE);
883
exitcode = EXIT_FAILURE;
884
goto end;
685
885
}
686
886
*address = '\0';
687
887
address = connect_to;
688
ret = start_mandos_communication(address, port, if_index);
888
ret = start_mandos_communication(address, port, if_index, &mc);
689
889
if(ret < 0){
690
exit(EXIT_FAILURE);
890
exitcode = EXIT_FAILURE;
691
891
} else {
692
exit(EXIT_SUCCESS);
693
}
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);
907
if(ret == -1){
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);
694
922
}
695
923
696
924
if (not debug){
697
925
avahi_set_log_function(empty_log);
698
926
}
699
927
700
/* Initialize the psuedo-RNG */
928
/* Initialize the pseudo-RNG for Avahi */
701
929
srand((unsigned int) time(NULL));
702
703
/* Allocate main loop object */
704
if (!(simple_poll = avahi_simple_poll_new())) {
705
fprintf(stderr, "Failed to create simple poll object.\n");
706
707
goto exit;
708
}
709
710
/* Do not publish any local records */
711
avahi_server_config_init(&config);
712
config.publish_hinfo = 0;
713
config.publish_addresses = 0;
714
config.publish_workstation = 0;
715
config.publish_domain = 0;
716
717
/* Allocate a new server */
718
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
719
&config, NULL, NULL, &error);
720
721
/* Free the configuration data */
722
avahi_server_config_free(&config);
723
724
/* Check if creating the server object succeeded */
725
if (!server) {
726
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",
727
961
avahi_strerror(error));
728
returncode = EXIT_FAILURE;
729
goto exit;
962
exitcode = EXIT_FAILURE;
963
goto end;
730
964
}
731
965
732
/* Create the service browser */
733
sb = avahi_s_service_browser_new(server, if_index,
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
734
968
AVAHI_PROTO_INET6,
735
969
"_mandos._tcp", NULL, 0,
736
browse_callback, server);
737
if (!sb) {
970
browse_callback, &mc);
971
if (sb == NULL) {
738
972
fprintf(stderr, "Failed to create service browser: %s\n",
739
avahi_strerror(avahi_server_errno(server)));
740
returncode = EXIT_FAILURE;
741
goto exit;
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
742
976
}
743
977
744
978
/* Run the main loop */
745
979
746
980
if (debug){
747
fprintf(stderr, "Starting avahi loop search\n");
981
fprintf(stderr, "Starting Avahi loop search\n");
748
982
}
749
983
750
avahi_simple_poll_loop(simple_poll);
984
avahi_simple_poll_loop(mc.simple_poll);
751
985
752
exit:
986
end:
753
987
754
988
if (debug){
755
989
fprintf(stderr, "%s exiting\n", argv[0]);
756
990
}
757
991
758
992
/* Cleanup things */
759
if (sb)
993
if (sb != NULL)
760
994
avahi_s_service_browser_free(sb);
761
995
762
if (server)
763
avahi_server_free(server);
764
765
if (simple_poll)
766
avahi_simple_poll_free(simple_poll);
767
768
return returncode;
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
998
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
1003
1004
return exitcode;
769
1005
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0