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- Committer: Teddy Hogeborn
- Date: 2008-07-31 19:51:44 UTC
- mfrom: (24.1.5 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080731195144-yb37wz2sr1e6b3m4
Merge.
- files added:
- ca.pem
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
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 <mandos@fukt.bsnet.se>.
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
36
#include <stdio.h>
38
37
#include <assert.h>
39
38
#include <stdlib.h>
40
39
#include <time.h>
41
40
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
41
47
42
#include <avahi-core/core.h>
48
43
#include <avahi-core/lookup.h>
51
46
#include <avahi-common/malloc.h>
52
47
#include <avahi-common/error.h>
53
48
54
/* Mandos client part */
49
//mandos client part
55
50
#include <sys/types.h> /* socket(), inet_pton() */
56
51
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
52
struct in6_addr, inet_pton() */
64
59
#include <string.h> /* memset */
65
60
#include <arpa/inet.h> /* inet_pton() */
66
61
#include <iso646.h> /* not */
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 */
62
63
// gpgme
72
64
#include <errno.h> /* perror() */
73
65
#include <gpgme.h>
74
66
67
// getopt long
68
#include <getopt.h>
69
75
70
#define BUFFER_SIZE 256
71
#define DH_BITS 1024
72
73
const char *certdir = "/conf/conf.d/cryptkeyreq/";
74
const char *certfile = "openpgp-client.txt";
75
const char *certkey = "openpgp-client-key.txt";
76
76
77
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>";
82
78
83
/* Used for passing in values through the Avahi callback functions */
84
79
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
80
gnutls_session_t session;
87
81
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
82
gnutls_dh_params_t dh_params;
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){
83
} encrypted_session;
84
85
86
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
87
char **new_packet, const char *homedir){
118
88
gpgme_data_t dh_crypto, dh_plain;
119
89
gpgme_ctx_t ctx;
120
90
gpgme_error_t rc;
121
91
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
124
94
gpgme_engine_info_t engine_info;
125
95
126
96
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
98
}
129
99
130
100
/* Init GPGME */
136
106
return -1;
137
107
}
138
108
139
/* Set GPGME home directory for the OpenPGP engine only */
109
/* Set GPGME home directory */
140
110
rc = gpgme_get_engine_info (&engine_info);
141
111
if (rc != GPG_ERR_NO_ERROR){
142
112
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
122
engine_info = engine_info->next;
153
123
}
154
124
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
125
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
126
return -1;
157
127
}
158
128
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
129
/* Create new GPGME data buffer from packet buffer */
130
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
131
if (rc != GPG_ERR_NO_ERROR){
163
132
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
133
gpgme_strsource(rc), gpgme_strerror(rc));
170
139
if (rc != GPG_ERR_NO_ERROR){
171
140
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
141
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
142
return -1;
175
143
}
176
144
179
147
if (rc != GPG_ERR_NO_ERROR){
180
148
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
149
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
150
return -1;
184
151
}
185
152
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
153
/* Decrypt data from the FILE pointer to the plaintext data
154
buffer */
188
155
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
156
if (rc != GPG_ERR_NO_ERROR){
190
157
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
158
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
159
return -1;
194
160
}
195
161
196
162
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
163
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
164
}
199
165
200
166
if (debug){
201
167
gpgme_decrypt_result_t result;
202
168
result = gpgme_op_decrypt_result(ctx);
226
192
}
227
193
}
228
194
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
197
229
198
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
199
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
200
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
201
}
235
202
236
*plaintext = NULL;
203
*new_packet = 0;
237
204
while(true){
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;
205
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
206
*new_packet = realloc(*new_packet,
207
(unsigned int)new_packet_capacity
208
+ BUFFER_SIZE);
209
if (*new_packet == NULL){
210
perror("realloc");
211
return -1;
212
}
213
new_packet_capacity += BUFFER_SIZE;
245
214
}
246
215
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
217
BUFFER_SIZE);
249
218
/* Print the data, if any */
250
219
if (ret == 0){
251
/* EOF */
252
220
break;
253
221
}
254
222
if(ret < 0){
255
223
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
224
return -1;
258
225
}
259
plaintext_length += ret;
226
new_packet_length += ret;
260
227
}
261
228
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);
229
/* FIXME: check characters before printing to screen so to not print
230
terminal control characters */
231
/* if(debug){ */
232
/* fprintf(stderr, "decrypted password is: "); */
233
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
234
/* fprintf(stderr, "\n"); */
235
/* } */
274
236
275
237
/* Delete the GPGME plaintext data buffer */
276
238
gpgme_data_release(dh_plain);
277
return plaintext_length;
239
return new_packet_length;
278
240
}
279
241
280
242
static const char * safer_gnutls_strerror (int value) {
284
246
return ret;
285
247
}
286
248
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
249
void debuggnutls(__attribute__((unused)) int level,
250
const char* string){
251
fprintf(stderr, "%s", string);
291
252
}
292
253
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
254
int initgnutls(encrypted_session *es){
255
const char *err;
296
256
int ret;
297
257
298
258
if(debug){
301
261
302
262
if ((ret = gnutls_global_init ())
303
263
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
264
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
265
return -1;
307
266
}
308
267
309
268
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
269
gnutls_global_set_log_level(11);
314
270
gnutls_global_set_log_function(debuggnutls);
315
271
}
316
272
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
273
/* openpgp credentials */
274
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
275
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
276
fprintf (stderr, "memory error: %s\n",
321
277
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
323
278
return -1;
324
279
}
325
280
326
281
if(debug){
327
282
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
283
" and keyfile %s as GnuTLS credentials\n", certfile,
284
certkey);
330
285
}
331
286
332
287
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
288
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
334
289
if (ret != GNUTLS_E_SUCCESS) {
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",
290
fprintf
291
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
292
" '%s')\n",
293
ret, certfile, certkey);
294
fprintf(stdout, "The Error is: %s\n",
339
295
safer_gnutls_strerror(ret));
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){
296
return -1;
297
}
298
299
//GnuTLS server initialization
300
if ((ret = gnutls_dh_params_init (&es->dh_params))
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "Error in dh parameter initialization: %s\n",
303
safer_gnutls_strerror(ret));
304
return -1;
305
}
306
307
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
308
!= GNUTLS_E_SUCCESS) {
309
fprintf (stderr, "Error in prime generation: %s\n",
310
safer_gnutls_strerror(ret));
311
return -1;
312
}
313
314
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
315
316
// GnuTLS session creation
317
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
318
!= GNUTLS_E_SUCCESS){
375
319
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
320
safer_gnutls_strerror(ret));
377
321
}
378
322
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
}
323
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
324
!= GNUTLS_E_SUCCESS) {
325
fprintf(stderr, "Syntax error at: %s\n", err);
326
fprintf(stderr, "GnuTLS error: %s\n",
327
safer_gnutls_strerror(ret));
328
return -1;
389
329
}
390
330
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",
331
if ((ret = gnutls_credentials_set
332
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
333
!= GNUTLS_E_SUCCESS) {
334
fprintf(stderr, "Error setting a credentials set: %s\n",
395
335
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
397
336
return -1;
398
337
}
399
338
400
339
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
340
gnutls_certificate_server_set_request (es->session,
402
341
GNUTLS_CERT_IGNORE);
403
342
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
405
344
406
345
return 0;
407
346
}
408
347
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
348
void empty_log(__attribute__((unused)) AvahiLogLevel level,
349
__attribute__((unused)) const char *txt){}
412
350
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){
351
int start_mandos_communication(const char *ip, uint16_t port,
352
AvahiIfIndex if_index){
417
353
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
354
struct sockaddr_in6 to;
355
encrypted_session es;
419
356
char *buffer = NULL;
420
357
char *decrypted_buffer;
421
358
size_t buffer_length = 0;
422
359
size_t buffer_capacity = 0;
423
360
ssize_t decrypted_buffer_size;
424
size_t written;
361
size_t written = 0;
425
362
int retval = 0;
426
363
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
}
433
364
434
365
if(debug){
435
366
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
441
372
perror("socket");
442
373
return -1;
443
374
}
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
375
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
if(debug){
447
378
perror("if_indextoname");
448
return -1;
449
379
}
380
return -1;
381
}
382
383
if(debug){
450
384
fprintf(stderr, "Binding to interface %s\n", interface);
451
385
}
452
386
453
387
memset(&to,0,sizeof(to)); /* Spurious warning */
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
to.sin6_family = AF_INET6;
389
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
458
390
if (ret < 0 ){
459
391
perror("inet_pton");
460
392
return -1;
461
}
393
}
462
394
if(ret == 0){
463
395
fprintf(stderr, "Bad address: %s\n", ip);
464
396
return -1;
465
397
}
466
to.in6.sin6_port = htons(port); /* Spurious warning */
398
to.sin6_port = htons(port); /* Spurious warning */
467
399
468
to.in6.sin6_scope_id = (uint32_t)if_index;
400
to.sin6_scope_id = (uint32_t)if_index;
469
401
470
402
if(debug){
471
403
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
}
404
/* char addrstr[INET6_ADDRSTRLEN]; */
405
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
406
/* sizeof(addrstr)) == NULL){ */
407
/* perror("inet_ntop"); */
408
/* } else { */
409
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
410
/* addrstr, ntohs(to.sin6_port)); */
411
/* } */
481
412
}
482
413
483
ret = connect(tcp_sd, &to.in, sizeof(to));
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
484
415
if (ret < 0){
485
416
perror("connect");
486
417
return -1;
487
418
}
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
}
419
420
ret = initgnutls (&es);
421
if (ret != 0){
422
retval = -1;
423
return -1;
511
424
}
512
425
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
428
513
429
if(debug){
514
430
fprintf(stderr, "Establishing TLS session with %s\n", ip);
515
431
}
516
432
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
433
ret = gnutls_handshake (es.session);
520
434
521
435
if (ret != GNUTLS_E_SUCCESS){
522
436
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
437
fprintf(stderr, "\n*** Handshake failed ***\n");
524
438
gnutls_perror (ret);
525
439
}
526
440
retval = -1;
527
goto mandos_end;
441
goto exit;
528
442
}
529
443
530
/* Read OpenPGP packet that contains the wanted password */
444
//Retrieve OpenPGP packet that contains the wanted password
531
445
532
446
if(debug){
533
447
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
535
449
}
536
450
537
451
while(true){
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;
452
if (buffer_length + BUFFER_SIZE > buffer_capacity){
453
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
454
if (buffer == NULL){
455
perror("realloc");
456
goto exit;
457
}
458
buffer_capacity += BUFFER_SIZE;
544
459
}
545
460
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
548
463
if (ret == 0){
549
464
break;
550
465
}
554
469
case GNUTLS_E_AGAIN:
555
470
break;
556
471
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
472
ret = gnutls_handshake (es.session);
558
473
if (ret < 0){
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
474
fprintf(stderr, "\n*** Handshake failed ***\n");
560
475
gnutls_perror (ret);
561
476
retval = -1;
562
goto mandos_end;
477
goto exit;
563
478
}
564
479
break;
565
480
default:
566
481
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
482
" encrypted session with mandos server\n");
568
483
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
484
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
485
goto exit;
571
486
}
572
487
} else {
573
488
buffer_length += (size_t) ret;
574
489
}
575
490
}
576
491
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
492
if (buffer_length > 0){
584
493
decrypted_buffer_size = pgp_packet_decrypt(buffer,
585
494
buffer_length,
586
495
&decrypted_buffer,
587
keydir);
496
certdir);
588
497
if (decrypted_buffer_size >= 0){
589
written = 0;
590
498
while(written < (size_t) decrypted_buffer_size){
591
499
ret = (int)fwrite (decrypted_buffer + written, 1,
592
500
(size_t)decrypted_buffer_size - written,
606
514
retval = -1;
607
515
}
608
516
}
609
610
/* Shutdown procedure */
611
612
mandos_end:
517
518
//shutdown procedure
519
520
if(debug){
521
fprintf(stderr, "Closing TLS session\n");
522
}
523
613
524
free(buffer);
525
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
526
exit:
614
527
close(tcp_sd);
615
gnutls_deinit (session);
528
gnutls_deinit (es.session);
529
gnutls_certificate_free_credentials (es.cred);
530
gnutls_global_deinit ();
616
531
return retval;
617
532
}
618
533
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;
534
static AvahiSimplePoll *simple_poll = NULL;
535
static AvahiServer *server = NULL;
536
537
static void resolve_callback(
538
AvahiSServiceResolver *r,
539
AvahiIfIndex interface,
540
AVAHI_GCC_UNUSED AvahiProtocol protocol,
541
AvahiResolverEvent event,
542
const char *name,
543
const char *type,
544
const char *domain,
545
const char *host_name,
546
const AvahiAddress *address,
547
uint16_t port,
548
AVAHI_GCC_UNUSED AvahiStringList *txt,
549
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
550
AVAHI_GCC_UNUSED void* userdata) {
551
634
552
assert(r); /* Spurious warning */
635
553
636
554
/* Called whenever a service has been resolved successfully or
639
557
switch (event) {
640
558
default:
641
559
case AVAHI_RESOLVER_FAILURE:
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)));
560
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
561
" type '%s' in domain '%s': %s\n", name, type, domain,
562
avahi_strerror(avahi_server_errno(server)));
645
563
break;
646
564
647
565
case AVAHI_RESOLVER_FOUND:
649
567
char ip[AVAHI_ADDRESS_STR_MAX];
650
568
avahi_address_snprint(ip, sizeof(ip), address);
651
569
if(debug){
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" port %d\n", name, host_name, ip, port);
654
572
}
655
int ret = start_mandos_communication(ip, port, interface, mc);
573
int ret = start_mandos_communication(ip, port, interface);
656
574
if (ret == 0){
657
575
exit(EXIT_SUCCESS);
658
576
}
661
579
avahi_s_service_resolver_free(r);
662
580
}
663
581
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");
582
static void browse_callback(
583
AvahiSServiceBrowser *b,
584
AvahiIfIndex interface,
585
AvahiProtocol protocol,
586
AvahiBrowserEvent event,
587
const char *name,
588
const char *type,
589
const char *domain,
590
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
591
void* userdata) {
592
593
AvahiServer *s = userdata;
594
assert(b); /* Spurious warning */
595
596
/* Called whenever a new services becomes available on the LAN or
597
is removed from the LAN */
598
599
switch (event) {
600
default:
601
case AVAHI_BROWSER_FAILURE:
602
603
fprintf(stderr, "(Browser) %s\n",
604
avahi_strerror(avahi_server_errno(server)));
605
avahi_simple_poll_quit(simple_poll);
606
return;
607
608
case AVAHI_BROWSER_NEW:
609
/* We ignore the returned resolver object. In the callback
610
function we free it. If the server is terminated before
611
the callback function is called the server will free
612
the resolver for us. */
613
614
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
615
type, domain,
616
AVAHI_PROTO_INET6, 0,
617
resolve_callback, s)))
618
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
619
avahi_strerror(avahi_server_errno(s)));
620
break;
621
622
case AVAHI_BROWSER_REMOVE:
623
break;
624
625
case AVAHI_BROWSER_ALL_FOR_NOW:
626
case AVAHI_BROWSER_CACHE_EXHAUSTED:
627
break;
710
628
}
711
break;
712
}
713
629
}
714
630
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);
631
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
632
const char *combinepath(const char *first, const char *second){
633
char *tmp;
634
tmp = malloc(strlen(first) + strlen(second) + 2);
721
635
if (tmp == NULL){
636
perror("malloc");
722
637
return NULL;
723
638
}
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';
639
strcpy(tmp, first);
640
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
641
strcat(tmp, "/");
642
}
643
strcat(tmp, second);
732
644
return tmp;
733
645
}
734
646
735
647
736
int main(int argc, char *argv[]){
648
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
649
AvahiServerConfig config;
737
650
AvahiSServiceBrowser *sb = NULL;
738
651
int error;
739
652
int ret;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
653
int returncode = EXIT_SUCCESS;
654
const char *interface = NULL;
655
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
746
656
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);
657
658
while (true){
659
static struct option long_options[] = {
660
{"debug", no_argument, (int *)&debug, 1},
661
{"connect", required_argument, 0, 'C'},
662
{"interface", required_argument, 0, 'i'},
663
{"certdir", required_argument, 0, 'd'},
664
{"certkey", required_argument, 0, 'c'},
665
{"certfile", required_argument, 0, 'k'},
666
{0, 0, 0, 0} };
667
668
int option_index = 0;
669
ret = getopt_long (argc, argv, "i:", long_options,
670
&option_index);
671
672
if (ret == -1){
673
break;
674
}
675
676
switch(ret){
677
case 0:
678
break;
679
case 'i':
680
interface = optarg;
681
break;
682
case 'C':
683
connect_to = optarg;
684
break;
685
case 'd':
686
certdir = optarg;
687
break;
688
case 'c':
689
certfile = optarg;
690
break;
691
case 'k':
692
certkey = optarg;
693
break;
694
default:
695
exit(EXIT_FAILURE);
696
}
697
}
698
699
certfile = combinepath(certdir, certfile);
700
if (certfile == NULL){
701
goto exit;
702
}
703
704
if(interface != NULL){
705
if_index = (AvahiIfIndex) if_nametoindex(interface);
706
if(if_index == 0){
707
fprintf(stderr, "No such interface: \"%s\"\n", interface);
708
exit(EXIT_FAILURE);
709
}
879
710
}
880
711
881
712
if(connect_to != NULL){
884
715
char *address = strrchr(connect_to, ':');
885
716
if(address == NULL){
886
717
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
718
exit(EXIT_FAILURE);
889
719
}
890
720
errno = 0;
891
721
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
722
if(errno){
893
723
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
724
exit(EXIT_FAILURE);
896
725
}
897
726
*address = '\0';
898
727
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
728
ret = start_mandos_communication(address, port, if_index);
900
729
if(ret < 0){
901
exitcode = EXIT_FAILURE;
730
exit(EXIT_FAILURE);
902
731
} else {
903
exitcode = EXIT_SUCCESS;
732
exit(EXIT_SUCCESS);
904
733
}
905
goto end;
906
734
}
907
735
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);
736
certkey = combinepath(certdir, certkey);
737
if (certkey == NULL){
738
goto exit;
933
739
}
934
740
935
741
if (not debug){
936
742
avahi_set_log_function(empty_log);
937
743
}
938
744
939
/* Initialize the pseudo-RNG for Avahi */
745
/* Initialize the psuedo-RNG */
940
746
srand((unsigned int) time(NULL));
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",
747
748
/* Allocate main loop object */
749
if (!(simple_poll = avahi_simple_poll_new())) {
750
fprintf(stderr, "Failed to create simple poll object.\n");
751
752
goto exit;
753
}
754
755
/* Do not publish any local records */
756
avahi_server_config_init(&config);
757
config.publish_hinfo = 0;
758
config.publish_addresses = 0;
759
config.publish_workstation = 0;
760
config.publish_domain = 0;
761
762
/* Allocate a new server */
763
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
764
&config, NULL, NULL, &error);
765
766
/* Free the configuration data */
767
avahi_server_config_free(&config);
768
769
/* Check if creating the server object succeeded */
770
if (!server) {
771
fprintf(stderr, "Failed to create server: %s\n",
972
772
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
773
returncode = EXIT_FAILURE;
774
goto exit;
975
775
}
976
776
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
777
/* Create the service browser */
778
sb = avahi_s_service_browser_new(server, if_index,
979
779
AVAHI_PROTO_INET6,
980
780
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
781
browse_callback, server);
782
if (!sb) {
983
783
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
784
avahi_strerror(avahi_server_errno(server)));
785
returncode = EXIT_FAILURE;
786
goto exit;
987
787
}
988
788
989
789
/* Run the main loop */
990
790
991
791
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
792
fprintf(stderr, "Starting avahi loop search\n");
993
793
}
994
794
995
avahi_simple_poll_loop(mc.simple_poll);
795
avahi_simple_poll_loop(simple_poll);
996
796
997
end:
797
exit:
998
798
999
799
if (debug){
1000
800
fprintf(stderr, "%s exiting\n", argv[0]);
1001
801
}
1002
802
1003
803
/* Cleanup things */
1004
if (sb != NULL)
804
if (sb)
1005
805
avahi_s_service_browser_free(sb);
1006
806
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
}
807
if (server)
808
avahi_server_free(server);
809
810
if (simple_poll)
811
avahi_simple_poll_free(simple_poll);
812
free(certfile);
813
free(certkey);
1019
814
1020
return exitcode;
815
return returncode;
1021
816
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0