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- Committer: Björn Påhlsson
- Date: 2008-08-08 01:25:11 UTC
- mfrom: (47 mandos)
- 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-20080808012511-l6zhkmcp1geyaed0
merge
- files added:
- mandos.conf
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- 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
8
8
* includes the following functions: "resolve_callback",
9
9
* "browse_callback", and parts of "main".
10
10
*
11
* Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
12
* Påhlsson.
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
13
*
14
14
* This program is free software: you can redistribute it and/or
15
15
* modify it under the terms of the GNU General Public License as
25
25
* along with this program. If not, see
26
26
* <http://www.gnu.org/licenses/>.
27
27
*
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
#define _FORTIFY_SOURCE 2
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
32
#define _LARGEFILE_SOURCE
35
33
#define _FILE_OFFSET_BITS 64
36
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
37
#include <stdio.h>
38
38
#include <assert.h>
39
39
#include <stdlib.h>
40
40
#include <time.h>
41
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
43
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
44
46
45
47
#include <avahi-core/core.h>
46
48
#include <avahi-core/lookup.h>
49
51
#include <avahi-common/malloc.h>
50
52
#include <avahi-common/error.h>
51
53
52
//mandos client part
54
/* Mandos client part */
53
55
#include <sys/types.h> /* socket(), inet_pton() */
54
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
57
struct in6_addr, inet_pton() */
62
64
#include <string.h> /* memset */
63
65
#include <arpa/inet.h> /* inet_pton() */
64
66
#include <iso646.h> /* not */
65
66
// gpgme
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
67
72
#include <errno.h> /* perror() */
68
73
#include <gpgme.h>
69
74
70
// getopt long
71
#include <getopt.h>
72
73
75
#define BUFFER_SIZE 256
74
#define DH_BITS 1024
75
76
const char *certdir = "/conf/conf.d/cryptkeyreq/";
77
const char *certfile = "openpgp-client.txt";
78
const char *certkey = "openpgp-client-key.txt";
79
76
80
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
82
83
/* Used for passing in values through the Avahi callback functions */
82
84
typedef struct {
83
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
84
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
85
89
gnutls_dh_params_t dh_params;
86
} encrypted_session;
87
88
89
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
90
char **new_packet, const char *homedir){
90
const char *priority;
91
} mandos_context;
92
93
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
96
* "buffer_length" is how much is already used.
97
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
103
return 0;
104
}
105
buffer_capacity += BUFFER_SIZE;
106
}
107
return buffer_capacity;
108
}
109
110
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
113
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
117
const char *homedir){
91
118
gpgme_data_t dh_crypto, dh_plain;
92
119
gpgme_ctx_t ctx;
93
120
gpgme_error_t rc;
94
121
ssize_t ret;
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
97
124
gpgme_engine_info_t engine_info;
98
125
99
126
if (debug){
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
101
128
}
102
129
103
130
/* Init GPGME */
109
136
return -1;
110
137
}
111
138
112
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
113
140
rc = gpgme_get_engine_info (&engine_info);
114
141
if (rc != GPG_ERR_NO_ERROR){
115
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
125
152
engine_info = engine_info->next;
126
153
}
127
154
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
129
156
return -1;
130
157
}
131
158
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
134
162
if (rc != GPG_ERR_NO_ERROR){
135
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
164
gpgme_strsource(rc), gpgme_strerror(rc));
142
170
if (rc != GPG_ERR_NO_ERROR){
143
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
144
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
145
174
return -1;
146
175
}
147
176
150
179
if (rc != GPG_ERR_NO_ERROR){
151
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
181
gpgme_strsource(rc), gpgme_strerror(rc));
153
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
154
184
}
155
185
156
/* Decrypt data from the FILE pointer to the plaintext data
157
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
158
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
189
if (rc != GPG_ERR_NO_ERROR){
160
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
161
191
gpgme_strsource(rc), gpgme_strerror(rc));
162
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
163
194
}
164
195
165
196
if(debug){
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
167
198
}
168
199
169
200
if (debug){
170
201
gpgme_decrypt_result_t result;
171
202
result = gpgme_op_decrypt_result(ctx);
195
226
}
196
227
}
197
228
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
200
201
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
204
234
}
205
235
206
*new_packet = 0;
236
*plaintext = NULL;
207
237
while(true){
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
211
+ BUFFER_SIZE);
212
if (*new_packet == NULL){
213
perror("realloc");
214
return -1;
215
}
216
new_packet_capacity += BUFFER_SIZE;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
217
245
}
218
246
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
248
BUFFER_SIZE);
221
249
/* Print the data, if any */
222
250
if (ret == 0){
251
/* EOF */
223
252
break;
224
253
}
225
254
if(ret < 0){
226
255
perror("gpgme_data_read");
227
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
228
258
}
229
new_packet_length += ret;
259
plaintext_length += ret;
230
260
}
231
261
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
234
/* if(debug){ */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
238
/* } */
262
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
264
for(ssize_t i = 0; i < plaintext_length; i++){
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
}
267
fprintf(stderr, "\n");
268
}
269
270
decrypt_end:
271
272
/* Delete the GPGME cryptotext data buffer */
273
gpgme_data_release(dh_crypto);
239
274
240
275
/* Delete the GPGME plaintext data buffer */
241
276
gpgme_data_release(dh_plain);
242
return new_packet_length;
277
return plaintext_length;
243
278
}
244
279
245
280
static const char * safer_gnutls_strerror (int value) {
249
284
return ret;
250
285
}
251
286
252
void debuggnutls(__attribute__((unused)) int level,
253
const char* string){
254
fprintf(stderr, "%s", string);
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
255
291
}
256
292
257
int initgnutls(encrypted_session *es){
258
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
259
296
int ret;
260
297
261
298
if(debug){
264
301
265
302
if ((ret = gnutls_global_init ())
266
303
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
268
306
return -1;
269
307
}
270
308
271
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
272
313
gnutls_global_set_log_level(11);
273
314
gnutls_global_set_log_function(debuggnutls);
274
315
}
275
316
276
/* openpgp credentials */
277
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
278
319
!= GNUTLS_E_SUCCESS) {
279
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
280
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
281
323
return -1;
282
324
}
283
325
284
326
if(debug){
285
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
286
" and keyfile %s as GnuTLS credentials\n", certfile,
287
certkey);
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
288
330
}
289
331
290
332
ret = gnutls_certificate_set_openpgp_key_file
291
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
292
334
if (ret != GNUTLS_E_SUCCESS) {
293
fprintf
294
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
295
" '%s')\n",
296
ret, certfile, certkey);
297
fprintf(stdout, "The Error is: %s\n",
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",
298
339
safer_gnutls_strerror(ret));
299
return -1;
300
}
301
302
//GnuTLS server initialization
303
if ((ret = gnutls_dh_params_init (&es->dh_params))
304
!= GNUTLS_E_SUCCESS) {
305
fprintf (stderr, "Error in dh parameter initialization: %s\n",
306
safer_gnutls_strerror(ret));
307
return -1;
308
}
309
310
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
311
!= GNUTLS_E_SUCCESS) {
312
fprintf (stderr, "Error in prime generation: %s\n",
313
safer_gnutls_strerror(ret));
314
return -1;
315
}
316
317
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
318
319
// GnuTLS session creation
320
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
321
!= GNUTLS_E_SUCCESS){
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){
322
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
323
376
safer_gnutls_strerror(ret));
324
377
}
325
378
326
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Syntax error at: %s\n", err);
329
fprintf(stderr, "GnuTLS error: %s\n",
330
safer_gnutls_strerror(ret));
331
return -1;
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
}
332
389
}
333
390
334
if ((ret = gnutls_credentials_set
335
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
336
!= GNUTLS_E_SUCCESS) {
337
fprintf(stderr, "Error setting a credentials set: %s\n",
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",
338
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
339
397
return -1;
340
398
}
341
399
342
400
/* ignore client certificate if any. */
343
gnutls_certificate_server_set_request (es->session,
401
gnutls_certificate_server_set_request (*session,
344
402
GNUTLS_CERT_IGNORE);
345
403
346
gnutls_dh_set_prime_bits (es->session, DH_BITS);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
347
405
348
406
return 0;
349
407
}
350
408
351
void empty_log(__attribute__((unused)) AvahiLogLevel level,
352
__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){}
353
412
354
int start_mandos_communication(const char *ip, uint16_t port,
355
unsigned int if_index){
413
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
356
417
int ret, tcp_sd;
357
struct sockaddr_in6 to;
358
encrypted_session es;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
359
419
char *buffer = NULL;
360
420
char *decrypted_buffer;
361
421
size_t buffer_length = 0;
362
422
size_t buffer_capacity = 0;
363
423
ssize_t decrypted_buffer_size;
364
size_t written = 0;
424
size_t written;
365
425
int retval = 0;
366
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
}
367
433
368
434
if(debug){
369
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
370
437
}
371
438
372
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
376
443
}
377
444
378
445
if(debug){
379
if(if_indextoname(if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
447
perror("if_indextoname");
383
448
return -1;
384
449
}
385
386
450
fprintf(stderr, "Binding to interface %s\n", interface);
387
451
}
388
452
389
453
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
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);
392
458
if (ret < 0 ){
393
459
perror("inet_pton");
394
460
return -1;
395
}
461
}
396
462
if(ret == 0){
397
463
fprintf(stderr, "Bad address: %s\n", ip);
398
464
return -1;
399
465
}
400
to.sin6_port = htons(port); /* Spurious warning */
466
to.in6.sin6_port = htons(port); /* Spurious warning */
401
467
402
to.sin6_scope_id = (uint32_t)if_index;
468
to.in6.sin6_scope_id = (uint32_t)if_index;
403
469
404
470
if(debug){
405
fprintf(stderr, "Connection to: %s\n", ip);
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
476
} else {
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
479
}
480
}
406
481
}
407
482
408
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
409
484
if (ret < 0){
410
485
perror("connect");
411
486
return -1;
412
487
}
413
414
ret = initgnutls (&es);
415
if (ret != 0){
416
retval = -1;
417
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
}
418
511
}
419
420
gnutls_transport_set_ptr (es.session,
421
(gnutls_transport_ptr_t) tcp_sd);
422
512
423
513
if(debug){
424
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
425
515
}
426
516
427
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
428
520
429
521
if (ret != GNUTLS_E_SUCCESS){
430
522
if(debug){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
432
524
gnutls_perror (ret);
433
525
}
434
526
retval = -1;
435
goto exit;
527
goto mandos_end;
436
528
}
437
529
438
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
439
531
440
532
if(debug){
441
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
443
535
}
444
536
445
537
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;
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;
453
544
}
454
545
455
ret = gnutls_record_recv
456
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
457
548
if (ret == 0){
458
549
break;
459
550
}
463
554
case GNUTLS_E_AGAIN:
464
555
break;
465
556
case GNUTLS_E_REHANDSHAKE:
466
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
467
558
if (ret < 0){
468
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
469
560
gnutls_perror (ret);
470
561
retval = -1;
471
goto exit;
562
goto mandos_end;
472
563
}
473
564
break;
474
565
default:
475
566
fprintf(stderr, "Unknown error while reading data from"
476
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
477
568
retval = -1;
478
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
479
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
480
571
}
481
572
} else {
482
573
buffer_length += (size_t) ret;
483
574
}
484
575
}
485
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
486
583
if (buffer_length > 0){
487
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
488
585
buffer_length,
489
586
&decrypted_buffer,
490
certdir);
587
keydir);
491
588
if (decrypted_buffer_size >= 0){
492
while(written < (size_t)decrypted_buffer_size){
589
written = 0;
590
while(written < (size_t) decrypted_buffer_size){
493
591
ret = (int)fwrite (decrypted_buffer + written, 1,
494
592
(size_t)decrypted_buffer_size - written,
495
593
stdout);
508
606
retval = -1;
509
607
}
510
608
}
511
512
//shutdown procedure
513
514
if(debug){
515
fprintf(stderr, "Closing TLS session\n");
516
}
517
609
610
/* Shutdown procedure */
611
612
mandos_end:
518
613
free(buffer);
519
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
520
exit:
521
614
close(tcp_sd);
522
gnutls_deinit (es.session);
523
gnutls_certificate_free_credentials (es.cred);
524
gnutls_global_deinit ();
615
gnutls_deinit (session);
525
616
return retval;
526
617
}
527
618
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
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;
546
634
assert(r); /* Spurious warning */
547
635
548
636
/* Called whenever a service has been resolved successfully or
551
639
switch (event) {
552
640
default:
553
641
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)));
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)));
557
645
break;
558
646
559
647
case AVAHI_RESOLVER_FOUND:
561
649
char ip[AVAHI_ADDRESS_STR_MAX];
562
650
avahi_address_snprint(ip, sizeof(ip), address);
563
651
if(debug){
564
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
565
" 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);
566
654
}
567
int ret = start_mandos_communication(ip, port,
568
(unsigned int) interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
569
656
if (ret == 0){
570
657
exit(EXIT_SUCCESS);
571
658
}
574
661
avahi_s_service_resolver_free(r);
575
662
}
576
663
577
static void browse_callback(
578
AvahiSServiceBrowser *b,
579
AvahiIfIndex interface,
580
AvahiProtocol protocol,
581
AvahiBrowserEvent event,
582
const char *name,
583
const char *type,
584
const char *domain,
585
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
586
void* userdata) {
587
588
AvahiServer *s = userdata;
589
assert(b); /* Spurious warning */
590
591
/* Called whenever a new services becomes available on the LAN or
592
is removed from the LAN */
593
594
switch (event) {
595
default:
596
case AVAHI_BROWSER_FAILURE:
597
598
fprintf(stderr, "(Browser) %s\n",
599
avahi_strerror(avahi_server_errno(server)));
600
avahi_simple_poll_quit(simple_poll);
601
return;
602
603
case AVAHI_BROWSER_NEW:
604
/* We ignore the returned resolver object. In the callback
605
function we free it. If the server is terminated before
606
the callback function is called the server will free
607
the resolver for us. */
608
609
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
610
type, domain,
611
AVAHI_PROTO_INET6, 0,
612
resolve_callback, s)))
613
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
614
avahi_strerror(avahi_server_errno(s)));
615
break;
616
617
case AVAHI_BROWSER_REMOVE:
618
break;
619
620
case AVAHI_BROWSER_ALL_FOR_NOW:
621
case AVAHI_BROWSER_CACHE_EXHAUSTED:
622
break;
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");
623
710
}
711
break;
712
}
624
713
}
625
714
626
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
627
const char *combinepath(const char *first, const char *second){
628
char *tmp;
629
tmp = malloc(strlen(first) + strlen(second) + 2);
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);
630
721
if (tmp == NULL){
631
perror("malloc");
632
722
return NULL;
633
723
}
634
strcpy(tmp, first);
635
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
636
strcat(tmp, "/");
637
}
638
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';
639
732
return tmp;
640
733
}
641
734
642
735
643
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
644
AvahiServerConfig config;
736
int main(int argc, char *argv[]){
645
737
AvahiSServiceBrowser *sb = NULL;
646
738
int error;
647
739
int ret;
648
int returncode = EXIT_SUCCESS;
740
int exitcode = EXIT_SUCCESS;
649
741
const char *interface = "eth0";
650
742
struct ifreq network;
651
743
int sd;
652
653
while (true){
654
static struct option long_options[] = {
655
{"debug", no_argument, (int *)&debug, 1},
656
{"interface", required_argument, 0, 'i'},
657
{"certdir", required_argument, 0, 'd'},
658
{"certkey", required_argument, 0, 'c'},
659
{"certfile", required_argument, 0, 'k'},
660
{0, 0, 0, 0} };
661
662
int option_index = 0;
663
ret = getopt_long (argc, argv, "i:", long_options,
664
&option_index);
665
666
if (ret == -1){
667
break;
668
}
669
670
switch(ret){
671
case 0:
672
break;
673
case 'i':
674
interface = optarg;
675
break;
676
case 'd':
677
certdir = optarg;
678
break;
679
case 'c':
680
certfile = optarg;
681
break;
682
case 'k':
683
certkey = optarg;
684
break;
685
default:
686
exit(EXIT_FAILURE);
687
}
688
}
689
690
certfile = combinepath(certdir, certfile);
691
if (certfile == NULL){
692
returncode = EXIT_FAILURE;
693
goto exit;
694
}
695
696
certkey = combinepath(certdir, certkey);
697
if (certkey == NULL){
698
returncode = EXIT_FAILURE;
699
goto exit;
700
}
701
702
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
703
if(sd < 0) {
704
perror("socket");
705
returncode = EXIT_FAILURE;
706
goto exit;
707
}
708
strcpy(network.ifr_name, interface);
709
ret = ioctl(sd, SIOCGIFFLAGS, &network);
710
if(ret == -1){
711
712
perror("ioctl SIOCGIFFLAGS");
713
returncode = EXIT_FAILURE;
714
goto exit;
715
}
716
if((network.ifr_flags & IFF_UP) == 0){
717
network.ifr_flags |= IFF_UP;
718
ret = ioctl(sd, SIOCSIFFLAGS, &network);
744
uid_t uid;
745
gid_t gid;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
876
if(if_index == 0){
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
878
exit(EXIT_FAILURE);
879
}
880
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
885
if(address == NULL){
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
errno = 0;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
if(errno){
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
*address = '\0';
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
900
if(ret < 0){
901
exitcode = EXIT_FAILURE;
902
} else {
903
exitcode = EXIT_SUCCESS;
904
}
905
goto end;
906
}
907
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
719
918
if(ret == -1){
720
perror("ioctl SIOCSIFFLAGS");
721
returncode = EXIT_FAILURE;
722
goto exit;
723
}
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);
724
933
}
725
close(sd);
726
934
727
935
if (not debug){
728
936
avahi_set_log_function(empty_log);
729
937
}
730
938
731
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
732
940
srand((unsigned int) time(NULL));
733
734
/* Allocate main loop object */
735
if (!(simple_poll = avahi_simple_poll_new())) {
736
fprintf(stderr, "Failed to create simple poll object.\n");
737
returncode = EXIT_FAILURE;
738
goto exit;
739
}
740
741
/* Do not publish any local records */
742
avahi_server_config_init(&config);
743
config.publish_hinfo = 0;
744
config.publish_addresses = 0;
745
config.publish_workstation = 0;
746
config.publish_domain = 0;
747
748
/* Allocate a new server */
749
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
750
&config, NULL, NULL, &error);
751
752
/* Free the configuration data */
753
avahi_server_config_free(&config);
754
755
/* Check if creating the server object succeeded */
756
if (!server) {
757
fprintf(stderr, "Failed to create server: %s\n",
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",
758
972
avahi_strerror(error));
759
returncode = EXIT_FAILURE;
760
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
761
975
}
762
976
763
/* Create the service browser */
764
sb = avahi_s_service_browser_new(server,
765
(AvahiIfIndex)
766
if_nametoindex(interface),
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
767
979
AVAHI_PROTO_INET6,
768
980
"_mandos._tcp", NULL, 0,
769
browse_callback, server);
770
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
771
983
fprintf(stderr, "Failed to create service browser: %s\n",
772
avahi_strerror(avahi_server_errno(server)));
773
returncode = EXIT_FAILURE;
774
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
775
987
}
776
988
777
989
/* Run the main loop */
778
990
779
991
if (debug){
780
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
781
993
}
782
994
783
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
784
996
785
exit:
997
end:
786
998
787
999
if (debug){
788
1000
fprintf(stderr, "%s exiting\n", argv[0]);
789
1001
}
790
1002
791
1003
/* Cleanup things */
792
if (sb)
1004
if (sb != NULL)
793
1005
avahi_s_service_browser_free(sb);
794
1006
795
if (server)
796
avahi_server_free(server);
797
798
if (simple_poll)
799
avahi_simple_poll_free(simple_poll);
800
free(certfile);
801
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
}
802
1019
803
return returncode;
1020
return exitcode;
804
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0