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- Committer: Björn Påhlsson
- Date: 2008-08-08 02:33:41 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 50.
- Revision ID: belorn@braxen-20080808023341-34aft2vw4f35nzam
* clients.conf.xml: Renamed to "mandos-clients.conf.xml".
* Makefile (DOCBOOKTOMAN, DOCS): New
(all): Include $(DOCS)
(%.5: %.xml, %.8: %.xml, %.8mandos: %.xml): New.
(clean): Also remove $(DOCS)
* Makefile (DOCBOOKTOMAN, DOCS): New
(all): Include $(DOCS)
(%.5: %.xml, %.8: %.xml, %.8mandos: %.xml): New.
(clean): Also remove $(DOCS)
- files added:
- mandos-client.xml
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- server.conf => mandos.conf
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugins.d/password-request.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
75
#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>";
78
82
83
/* Used for passing in values through the Avahi callback functions */
79
84
typedef struct {
80
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
81
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
82
89
gnutls_dh_params_t dh_params;
83
} encrypted_session;
84
85
86
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
87
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){
88
118
gpgme_data_t dh_crypto, dh_plain;
89
119
gpgme_ctx_t ctx;
90
120
gpgme_error_t rc;
91
121
ssize_t ret;
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
94
124
gpgme_engine_info_t engine_info;
95
125
96
126
if (debug){
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
98
128
}
99
129
100
130
/* Init GPGME */
106
136
return -1;
107
137
}
108
138
109
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
110
140
rc = gpgme_get_engine_info (&engine_info);
111
141
if (rc != GPG_ERR_NO_ERROR){
112
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
122
152
engine_info = engine_info->next;
123
153
}
124
154
if(engine_info == NULL){
125
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
126
156
return -1;
127
157
}
128
158
129
/* Create new GPGME data buffer from packet buffer */
130
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);
131
162
if (rc != GPG_ERR_NO_ERROR){
132
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
133
164
gpgme_strsource(rc), gpgme_strerror(rc));
139
170
if (rc != GPG_ERR_NO_ERROR){
140
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
141
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
142
174
return -1;
143
175
}
144
176
147
179
if (rc != GPG_ERR_NO_ERROR){
148
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
149
181
gpgme_strsource(rc), gpgme_strerror(rc));
150
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
151
184
}
152
185
153
/* Decrypt data from the FILE pointer to the plaintext data
154
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
155
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
156
189
if (rc != GPG_ERR_NO_ERROR){
157
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
158
191
gpgme_strsource(rc), gpgme_strerror(rc));
159
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
160
194
}
161
195
162
196
if(debug){
163
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
164
198
}
165
199
166
200
if (debug){
167
201
gpgme_decrypt_result_t result;
168
202
result = gpgme_op_decrypt_result(ctx);
192
226
}
193
227
}
194
228
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
197
198
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
199
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
200
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
201
234
}
202
235
203
*new_packet = 0;
236
*plaintext = NULL;
204
237
while(true){
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;
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;
214
245
}
215
246
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
217
248
BUFFER_SIZE);
218
249
/* Print the data, if any */
219
250
if (ret == 0){
251
/* EOF */
220
252
break;
221
253
}
222
254
if(ret < 0){
223
255
perror("gpgme_data_read");
224
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
225
258
}
226
new_packet_length += ret;
259
plaintext_length += ret;
227
260
}
228
261
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
/* } */
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);
236
274
237
275
/* Delete the GPGME plaintext data buffer */
238
276
gpgme_data_release(dh_plain);
239
return new_packet_length;
277
return plaintext_length;
240
278
}
241
279
242
280
static const char * safer_gnutls_strerror (int value) {
246
284
return ret;
247
285
}
248
286
249
void debuggnutls(__attribute__((unused)) int level,
250
const char* string){
251
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);
252
291
}
253
292
254
int initgnutls(encrypted_session *es){
255
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
256
296
int ret;
257
297
258
298
if(debug){
261
301
262
302
if ((ret = gnutls_global_init ())
263
303
!= GNUTLS_E_SUCCESS) {
264
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
265
306
return -1;
266
307
}
267
308
268
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
269
313
gnutls_global_set_log_level(11);
270
314
gnutls_global_set_log_function(debuggnutls);
271
315
}
272
316
273
/* openpgp credentials */
274
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
275
319
!= GNUTLS_E_SUCCESS) {
276
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
277
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
278
323
return -1;
279
324
}
280
325
281
326
if(debug){
282
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
283
" and keyfile %s as GnuTLS credentials\n", certfile,
284
certkey);
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
285
330
}
286
331
287
332
ret = gnutls_certificate_set_openpgp_key_file
288
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
289
334
if (ret != GNUTLS_E_SUCCESS) {
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",
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",
295
339
safer_gnutls_strerror(ret));
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){
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){
319
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
320
376
safer_gnutls_strerror(ret));
321
377
}
322
378
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;
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
}
329
389
}
330
390
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",
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",
335
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
336
397
return -1;
337
398
}
338
399
339
400
/* ignore client certificate if any. */
340
gnutls_certificate_server_set_request (es->session,
401
gnutls_certificate_server_set_request (*session,
341
402
GNUTLS_CERT_IGNORE);
342
403
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
344
405
345
406
return 0;
346
407
}
347
408
348
void empty_log(__attribute__((unused)) AvahiLogLevel level,
349
__attribute__((unused)) const char *txt){}
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
350
412
351
int start_mandos_communication(const char *ip, uint16_t port,
352
AvahiIfIndex if_index){
413
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
353
417
int ret, tcp_sd;
354
struct sockaddr_in6 to;
355
encrypted_session es;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
356
419
char *buffer = NULL;
357
420
char *decrypted_buffer;
358
421
size_t buffer_length = 0;
359
422
size_t buffer_capacity = 0;
360
423
ssize_t decrypted_buffer_size;
361
size_t written = 0;
424
size_t written;
362
425
int retval = 0;
363
426
char interface[IF_NAMESIZE];
427
gnutls_session_t session;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
364
433
365
434
if(debug){
366
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
372
441
perror("socket");
373
442
return -1;
374
443
}
375
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
if(debug){
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
378
447
perror("if_indextoname");
448
return -1;
379
449
}
380
return -1;
381
}
382
383
if(debug){
384
450
fprintf(stderr, "Binding to interface %s\n", interface);
385
451
}
386
452
387
453
memset(&to,0,sizeof(to)); /* Spurious warning */
388
to.sin6_family = AF_INET6;
389
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
390
458
if (ret < 0 ){
391
459
perror("inet_pton");
392
460
return -1;
393
}
461
}
394
462
if(ret == 0){
395
463
fprintf(stderr, "Bad address: %s\n", ip);
396
464
return -1;
397
465
}
398
to.sin6_port = htons(port); /* Spurious warning */
466
to.in6.sin6_port = htons(port); /* Spurious warning */
399
467
400
to.sin6_scope_id = (uint32_t)if_index;
468
to.in6.sin6_scope_id = (uint32_t)if_index;
401
469
402
470
if(debug){
403
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
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
/* } */
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
}
412
481
}
413
482
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
415
484
if (ret < 0){
416
485
perror("connect");
417
486
return -1;
418
487
}
419
420
ret = initgnutls (&es);
421
if (ret != 0){
422
retval = -1;
423
return -1;
488
489
const char *out = mandos_protocol_version;
490
written = 0;
491
while (true){
492
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
495
if (ret == -1){
496
perror("write");
497
retval = -1;
498
goto mandos_end;
499
}
500
written += (size_t)ret;
501
if(written < out_size){
502
continue;
503
} else {
504
if (out == mandos_protocol_version){
505
written = 0;
506
out = "\r\n";
507
} else {
508
break;
509
}
510
}
424
511
}
425
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
428
512
429
513
if(debug){
430
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
431
515
}
432
516
433
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
434
520
435
521
if (ret != GNUTLS_E_SUCCESS){
436
522
if(debug){
437
fprintf(stderr, "\n*** Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
438
524
gnutls_perror (ret);
439
525
}
440
526
retval = -1;
441
goto exit;
527
goto mandos_end;
442
528
}
443
529
444
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
445
531
446
532
if(debug){
447
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
449
535
}
450
536
451
537
while(true){
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;
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;
459
544
}
460
545
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
463
548
if (ret == 0){
464
549
break;
465
550
}
469
554
case GNUTLS_E_AGAIN:
470
555
break;
471
556
case GNUTLS_E_REHANDSHAKE:
472
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
473
558
if (ret < 0){
474
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
475
560
gnutls_perror (ret);
476
561
retval = -1;
477
goto exit;
562
goto mandos_end;
478
563
}
479
564
break;
480
565
default:
481
566
fprintf(stderr, "Unknown error while reading data from"
482
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
483
568
retval = -1;
484
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
485
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
486
571
}
487
572
} else {
488
573
buffer_length += (size_t) ret;
489
574
}
490
575
}
491
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
492
583
if (buffer_length > 0){
493
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
494
585
buffer_length,
495
586
&decrypted_buffer,
496
certdir);
587
keydir);
497
588
if (decrypted_buffer_size >= 0){
589
written = 0;
498
590
while(written < (size_t) decrypted_buffer_size){
499
591
ret = (int)fwrite (decrypted_buffer + written, 1,
500
592
(size_t)decrypted_buffer_size - written,
514
606
retval = -1;
515
607
}
516
608
}
517
518
//shutdown procedure
519
520
if(debug){
521
fprintf(stderr, "Closing TLS session\n");
522
}
523
609
610
/* Shutdown procedure */
611
612
mandos_end:
524
613
free(buffer);
525
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
526
exit:
527
614
close(tcp_sd);
528
gnutls_deinit (es.session);
529
gnutls_certificate_free_credentials (es.cred);
530
gnutls_global_deinit ();
615
gnutls_deinit (session);
531
616
return retval;
532
617
}
533
618
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
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;
552
634
assert(r); /* Spurious warning */
553
635
554
636
/* Called whenever a service has been resolved successfully or
557
639
switch (event) {
558
640
default:
559
641
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
563
645
break;
564
646
565
647
case AVAHI_RESOLVER_FOUND:
567
649
char ip[AVAHI_ADDRESS_STR_MAX];
568
650
avahi_address_snprint(ip, sizeof(ip), address);
569
651
if(debug){
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" port %d\n", name, host_name, ip, port);
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
572
654
}
573
int ret = start_mandos_communication(ip, port, interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
574
656
if (ret == 0){
575
657
exit(EXIT_SUCCESS);
576
658
}
579
661
avahi_s_service_resolver_free(r);
580
662
}
581
663
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;
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");
628
710
}
711
break;
712
}
629
713
}
630
714
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);
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);
635
721
if (tmp == NULL){
636
perror("malloc");
637
722
return NULL;
638
723
}
639
strcpy(tmp, first);
640
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
641
strcat(tmp, "/");
642
}
643
strcat(tmp, second);
724
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
726
}
727
tmp[f_len] = '/';
728
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
730
}
731
tmp[f_len + 1 + s_len] = '\0';
644
732
return tmp;
645
733
}
646
734
647
735
648
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
649
AvahiServerConfig config;
736
int main(int argc, char *argv[]){
650
737
AvahiSServiceBrowser *sb = NULL;
651
738
int error;
652
739
int ret;
653
int returncode = EXIT_SUCCESS;
654
const char *interface = NULL;
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;
746
char *connect_to = NULL;
655
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
656
char *connect_to = NULL;
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
}
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);
710
879
}
711
880
712
881
if(connect_to != NULL){
715
884
char *address = strrchr(connect_to, ':');
716
885
if(address == NULL){
717
886
fprintf(stderr, "No colon in address\n");
718
exit(EXIT_FAILURE);
887
exitcode = EXIT_FAILURE;
888
goto end;
719
889
}
720
890
errno = 0;
721
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
722
892
if(errno){
723
893
perror("Bad port number");
724
exit(EXIT_FAILURE);
894
exitcode = EXIT_FAILURE;
895
goto end;
725
896
}
726
897
*address = '\0';
727
898
address = connect_to;
728
ret = start_mandos_communication(address, port, if_index);
899
ret = start_mandos_communication(address, port, if_index, &mc);
729
900
if(ret < 0){
730
exit(EXIT_FAILURE);
901
exitcode = EXIT_FAILURE;
731
902
} else {
732
exit(EXIT_SUCCESS);
903
exitcode = EXIT_SUCCESS;
733
904
}
905
goto end;
734
906
}
735
907
736
certkey = combinepath(certdir, certkey);
737
if (certkey == NULL){
738
goto exit;
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);
739
933
}
740
934
741
935
if (not debug){
742
936
avahi_set_log_function(empty_log);
743
937
}
744
938
745
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
746
940
srand((unsigned int) time(NULL));
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",
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",
772
972
avahi_strerror(error));
773
returncode = EXIT_FAILURE;
774
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
775
975
}
776
976
777
/* Create the service browser */
778
sb = avahi_s_service_browser_new(server, if_index,
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
779
979
AVAHI_PROTO_INET6,
780
980
"_mandos._tcp", NULL, 0,
781
browse_callback, server);
782
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
783
983
fprintf(stderr, "Failed to create service browser: %s\n",
784
avahi_strerror(avahi_server_errno(server)));
785
returncode = EXIT_FAILURE;
786
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
787
987
}
788
988
789
989
/* Run the main loop */
790
990
791
991
if (debug){
792
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
793
993
}
794
994
795
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
796
996
797
exit:
997
end:
798
998
799
999
if (debug){
800
1000
fprintf(stderr, "%s exiting\n", argv[0]);
801
1001
}
802
1002
803
1003
/* Cleanup things */
804
if (sb)
1004
if (sb != NULL)
805
1005
avahi_s_service_browser_free(sb);
806
1006
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);
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
}
814
1019
815
return returncode;
1020
return exitcode;
816
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0