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- Committer: Björn Påhlsson
- Date: 2008-07-31 16:20:47 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 30.
- Revision ID: belorn@braxen-20080731162047-lahe2b2prwjw8b2l
plugbasedclient:
Added support to disable plugins
Added support to change plugin directory
mandosclient.c
Fixed some funtion calls that lacked error handling
small bugfix
Added support to disable plugins
Added support to change plugin directory
mandosclient.c
Fixed some funtion calls that lacked error handling
small bugfix
- files added:
- ca.pem
- files removed:
- clients.conf.xml
- files renamed:
- clients.conf => mandos-clients.conf
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
8
8
* includes the following functions: "resolve_callback",
9
9
* "browse_callback", and parts of "main".
10
10
*
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
11
* Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
12
* 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 <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
/* Needed by GPGME, specifically gpgme_data_seek() */
32
#define _FORTIFY_SOURCE 2
33
32
34
#define _LARGEFILE_SOURCE
33
35
#define _FILE_OFFSET_BITS 64
34
36
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,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
42
47
43
#include <avahi-core/core.h>
48
44
#include <avahi-core/lookup.h>
51
47
#include <avahi-common/malloc.h>
52
48
#include <avahi-common/error.h>
53
49
54
/* Mandos client part */
50
//mandos client part
55
51
#include <sys/types.h> /* socket(), inet_pton() */
56
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
53
struct in6_addr, inet_pton() */
64
60
#include <string.h> /* memset */
65
61
#include <arpa/inet.h> /* inet_pton() */
66
62
#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 */
63
64
// gpgme
72
65
#include <errno.h> /* perror() */
73
66
#include <gpgme.h>
74
67
68
// getopt long
69
#include <getopt.h>
70
75
71
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
74
const char *certdir = "/conf/conf.d/cryptkeyreq/";
75
const char *certfile = "openpgp-client.txt";
76
const char *certkey = "openpgp-client-key.txt";
76
77
77
78
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
79
83
/* Used for passing in values through the Avahi callback functions */
84
80
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
81
gnutls_session_t session;
87
82
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
83
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){
84
} encrypted_session;
85
86
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
118
89
gpgme_data_t dh_crypto, dh_plain;
119
90
gpgme_ctx_t ctx;
120
91
gpgme_error_t rc;
121
92
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
124
95
gpgme_engine_info_t engine_info;
125
96
126
97
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
99
}
129
100
130
101
/* Init GPGME */
136
107
return -1;
137
108
}
138
109
139
/* Set GPGME home directory for the OpenPGP engine only */
110
/* Set GPGME home directory */
140
111
rc = gpgme_get_engine_info (&engine_info);
141
112
if (rc != GPG_ERR_NO_ERROR){
142
113
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
123
engine_info = engine_info->next;
153
124
}
154
125
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
126
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
127
return -1;
157
128
}
158
129
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
130
/* Create new GPGME data buffer from packet buffer */
131
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
132
if (rc != GPG_ERR_NO_ERROR){
163
133
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
134
gpgme_strsource(rc), gpgme_strerror(rc));
170
140
if (rc != GPG_ERR_NO_ERROR){
171
141
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
142
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
143
return -1;
175
144
}
176
145
179
148
if (rc != GPG_ERR_NO_ERROR){
180
149
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
150
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
151
return -1;
184
152
}
185
153
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
154
/* Decrypt data from the FILE pointer to the plaintext data
155
buffer */
188
156
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
157
if (rc != GPG_ERR_NO_ERROR){
190
158
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
159
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
160
return -1;
194
161
}
195
162
196
163
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
164
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
165
}
199
166
200
167
if (debug){
201
168
gpgme_decrypt_result_t result;
202
169
result = gpgme_op_decrypt_result(ctx);
226
193
}
227
194
}
228
195
196
/* Delete the GPGME FILE pointer cryptotext data buffer */
197
gpgme_data_release(dh_crypto);
198
229
199
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
200
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
201
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
202
}
235
203
236
*plaintext = NULL;
204
*new_packet = 0;
237
205
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;
206
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
207
*new_packet = realloc(*new_packet,
208
(unsigned int)new_packet_capacity
209
+ BUFFER_SIZE);
210
if (*new_packet == NULL){
211
perror("realloc");
212
return -1;
213
}
214
new_packet_capacity += BUFFER_SIZE;
245
215
}
246
216
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
217
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
218
BUFFER_SIZE);
249
219
/* Print the data, if any */
250
220
if (ret == 0){
251
/* EOF */
252
221
break;
253
222
}
254
223
if(ret < 0){
255
224
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
225
return -1;
258
226
}
259
plaintext_length += ret;
227
new_packet_length += ret;
260
228
}
261
229
262
if(debug){
263
fprintf(stderr, "Decrypted password is: ");
264
for(ssize_t i = 0; i < plaintext_length; i++){
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
266
}
267
fprintf(stderr, "\n");
268
}
269
270
decrypt_end:
271
272
/* Delete the GPGME cryptotext data buffer */
273
gpgme_data_release(dh_crypto);
230
/* FIXME: check characters before printing to screen so to not print
231
terminal control characters */
232
/* if(debug){ */
233
/* fprintf(stderr, "decrypted password is: "); */
234
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
235
/* fprintf(stderr, "\n"); */
236
/* } */
274
237
275
238
/* Delete the GPGME plaintext data buffer */
276
239
gpgme_data_release(dh_plain);
277
return plaintext_length;
240
return new_packet_length;
278
241
}
279
242
280
243
static const char * safer_gnutls_strerror (int value) {
284
247
return ret;
285
248
}
286
249
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
250
void debuggnutls(__attribute__((unused)) int level,
251
const char* string){
252
fprintf(stderr, "%s", string);
291
253
}
292
254
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
255
int initgnutls(encrypted_session *es){
256
const char *err;
296
257
int ret;
297
258
298
259
if(debug){
301
262
302
263
if ((ret = gnutls_global_init ())
303
264
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
265
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
266
return -1;
307
267
}
308
268
309
269
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
270
gnutls_global_set_log_level(11);
314
271
gnutls_global_set_log_function(debuggnutls);
315
272
}
316
273
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
274
/* openpgp credentials */
275
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
276
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
277
fprintf (stderr, "memory error: %s\n",
321
278
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
323
279
return -1;
324
280
}
325
281
326
282
if(debug){
327
283
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
284
" and keyfile %s as GnuTLS credentials\n", certfile,
285
certkey);
330
286
}
331
287
332
288
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
289
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
334
290
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",
291
fprintf
292
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
293
" '%s')\n",
294
ret, certfile, certkey);
295
fprintf(stdout, "The Error is: %s\n",
339
296
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){
297
return -1;
298
}
299
300
//GnuTLS server initialization
301
if ((ret = gnutls_dh_params_init (&es->dh_params))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in dh parameter initialization: %s\n",
304
safer_gnutls_strerror(ret));
305
return -1;
306
}
307
308
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
309
!= GNUTLS_E_SUCCESS) {
310
fprintf (stderr, "Error in prime generation: %s\n",
311
safer_gnutls_strerror(ret));
312
return -1;
313
}
314
315
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
316
317
// GnuTLS session creation
318
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
319
!= GNUTLS_E_SUCCESS){
375
320
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
321
safer_gnutls_strerror(ret));
377
322
}
378
323
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
}
324
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
325
!= GNUTLS_E_SUCCESS) {
326
fprintf(stderr, "Syntax error at: %s\n", err);
327
fprintf(stderr, "GnuTLS error: %s\n",
328
safer_gnutls_strerror(ret));
329
return -1;
389
330
}
390
331
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",
332
if ((ret = gnutls_credentials_set
333
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
334
!= GNUTLS_E_SUCCESS) {
335
fprintf(stderr, "Error setting a credentials set: %s\n",
395
336
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
397
337
return -1;
398
338
}
399
339
400
340
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
341
gnutls_certificate_server_set_request (es->session,
402
342
GNUTLS_CERT_IGNORE);
403
343
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
344
gnutls_dh_set_prime_bits (es->session, DH_BITS);
405
345
406
346
return 0;
407
347
}
408
348
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
349
void empty_log(__attribute__((unused)) AvahiLogLevel level,
350
__attribute__((unused)) const char *txt){}
412
351
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){
352
int start_mandos_communication(const char *ip, uint16_t port,
353
unsigned int if_index){
417
354
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
355
struct sockaddr_in6 to;
356
encrypted_session es;
419
357
char *buffer = NULL;
420
358
char *decrypted_buffer;
421
359
size_t buffer_length = 0;
422
360
size_t buffer_capacity = 0;
423
361
ssize_t decrypted_buffer_size;
424
size_t written;
362
size_t written = 0;
425
363
int retval = 0;
426
364
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
365
434
366
if(debug){
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
367
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
437
368
}
438
369
439
370
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
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(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
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
}
403
fprintf(stderr, "Connection to: %s\n", ip);
481
404
}
482
405
483
ret = connect(tcp_sd, &to.in, sizeof(to));
406
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
484
407
if (ret < 0){
485
408
perror("connect");
486
409
return -1;
487
410
}
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
}
411
412
ret = initgnutls (&es);
413
if (ret != 0){
414
retval = -1;
415
return -1;
511
416
}
512
417
418
gnutls_transport_set_ptr (es.session,
419
(gnutls_transport_ptr_t) tcp_sd);
420
513
421
if(debug){
514
422
fprintf(stderr, "Establishing TLS session with %s\n", ip);
515
423
}
516
424
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
425
ret = gnutls_handshake (es.session);
520
426
521
427
if (ret != GNUTLS_E_SUCCESS){
522
428
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
429
fprintf(stderr, "\n*** Handshake failed ***\n");
524
430
gnutls_perror (ret);
525
431
}
526
432
retval = -1;
527
goto mandos_end;
433
goto exit;
528
434
}
529
435
530
/* Read OpenPGP packet that contains the wanted password */
436
//Retrieve OpenPGP packet that contains the wanted password
531
437
532
438
if(debug){
533
439
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
535
441
}
536
442
537
443
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;
444
if (buffer_length + BUFFER_SIZE > buffer_capacity){
445
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
446
if (buffer == NULL){
447
perror("realloc");
448
goto exit;
449
}
450
buffer_capacity += BUFFER_SIZE;
544
451
}
545
452
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
453
ret = gnutls_record_recv
454
(es.session, buffer+buffer_length, BUFFER_SIZE);
548
455
if (ret == 0){
549
456
break;
550
457
}
554
461
case GNUTLS_E_AGAIN:
555
462
break;
556
463
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
464
ret = gnutls_handshake (es.session);
558
465
if (ret < 0){
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
466
fprintf(stderr, "\n*** Handshake failed ***\n");
560
467
gnutls_perror (ret);
561
468
retval = -1;
562
goto mandos_end;
469
goto exit;
563
470
}
564
471
break;
565
472
default:
566
473
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
474
" encrypted session with mandos server\n");
568
475
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
476
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
477
goto exit;
571
478
}
572
479
} else {
573
480
buffer_length += (size_t) ret;
574
481
}
575
482
}
576
483
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
484
if (buffer_length > 0){
584
485
decrypted_buffer_size = pgp_packet_decrypt(buffer,
585
486
buffer_length,
586
487
&decrypted_buffer,
587
keydir);
488
certdir);
588
489
if (decrypted_buffer_size >= 0){
589
written = 0;
590
while(written < (size_t) decrypted_buffer_size){
490
while(written < decrypted_buffer_size){
591
491
ret = (int)fwrite (decrypted_buffer + written, 1,
592
492
(size_t)decrypted_buffer_size - written,
593
493
stdout);
606
506
retval = -1;
607
507
}
608
508
}
609
610
/* Shutdown procedure */
611
612
mandos_end:
509
510
//shutdown procedure
511
512
if(debug){
513
fprintf(stderr, "Closing TLS session\n");
514
}
515
613
516
free(buffer);
517
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
518
exit:
614
519
close(tcp_sd);
615
gnutls_deinit (session);
520
gnutls_deinit (es.session);
521
gnutls_certificate_free_credentials (es.cred);
522
gnutls_global_deinit ();
616
523
return retval;
617
524
}
618
525
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;
526
static AvahiSimplePoll *simple_poll = NULL;
527
static AvahiServer *server = NULL;
528
529
static void resolve_callback(
530
AvahiSServiceResolver *r,
531
AvahiIfIndex interface,
532
AVAHI_GCC_UNUSED AvahiProtocol protocol,
533
AvahiResolverEvent event,
534
const char *name,
535
const char *type,
536
const char *domain,
537
const char *host_name,
538
const AvahiAddress *address,
539
uint16_t port,
540
AVAHI_GCC_UNUSED AvahiStringList *txt,
541
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
542
AVAHI_GCC_UNUSED void* userdata) {
543
634
544
assert(r); /* Spurious warning */
635
545
636
546
/* Called whenever a service has been resolved successfully or
639
549
switch (event) {
640
550
default:
641
551
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)));
552
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
553
" type '%s' in domain '%s': %s\n", name, type, domain,
554
avahi_strerror(avahi_server_errno(server)));
645
555
break;
646
556
647
557
case AVAHI_RESOLVER_FOUND:
649
559
char ip[AVAHI_ADDRESS_STR_MAX];
650
560
avahi_address_snprint(ip, sizeof(ip), address);
651
561
if(debug){
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
562
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
563
" port %d\n", name, host_name, ip, port);
654
564
}
655
int ret = start_mandos_communication(ip, port, interface, mc);
565
int ret = start_mandos_communication(ip, port,
566
(unsigned int) interface);
656
567
if (ret == 0){
657
568
exit(EXIT_SUCCESS);
658
569
}
661
572
avahi_s_service_resolver_free(r);
662
573
}
663
574
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");
575
static void browse_callback(
576
AvahiSServiceBrowser *b,
577
AvahiIfIndex interface,
578
AvahiProtocol protocol,
579
AvahiBrowserEvent event,
580
const char *name,
581
const char *type,
582
const char *domain,
583
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
584
void* userdata) {
585
586
AvahiServer *s = userdata;
587
assert(b); /* Spurious warning */
588
589
/* Called whenever a new services becomes available on the LAN or
590
is removed from the LAN */
591
592
switch (event) {
593
default:
594
case AVAHI_BROWSER_FAILURE:
595
596
fprintf(stderr, "(Browser) %s\n",
597
avahi_strerror(avahi_server_errno(server)));
598
avahi_simple_poll_quit(simple_poll);
599
return;
600
601
case AVAHI_BROWSER_NEW:
602
/* We ignore the returned resolver object. In the callback
603
function we free it. If the server is terminated before
604
the callback function is called the server will free
605
the resolver for us. */
606
607
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
608
type, domain,
609
AVAHI_PROTO_INET6, 0,
610
resolve_callback, s)))
611
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
612
avahi_strerror(avahi_server_errno(s)));
613
break;
614
615
case AVAHI_BROWSER_REMOVE:
616
break;
617
618
case AVAHI_BROWSER_ALL_FOR_NOW:
619
case AVAHI_BROWSER_CACHE_EXHAUSTED:
620
break;
710
621
}
711
break;
712
}
713
622
}
714
623
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);
624
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
625
const char *combinepath(const char *first, const char *second){
626
char *tmp;
627
tmp = malloc(strlen(first) + strlen(second) + 2);
721
628
if (tmp == NULL){
629
perror("malloc");
722
630
return NULL;
723
631
}
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';
632
strcpy(tmp, first);
633
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
634
strcat(tmp, "/");
635
}
636
strcat(tmp, second);
732
637
return tmp;
733
638
}
734
639
735
640
736
int main(int argc, char *argv[]){
641
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
642
AvahiServerConfig config;
737
643
AvahiSServiceBrowser *sb = NULL;
738
644
int error;
739
645
int ret;
740
int exitcode = EXIT_SUCCESS;
646
int returncode = EXIT_SUCCESS;
741
647
const char *interface = "eth0";
742
struct ifreq network;
743
int sd;
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);
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);
933
}
934
648
649
while (true){
650
static struct option long_options[] = {
651
{"debug", no_argument, (int *)&debug, 1},
652
{"interface", required_argument, 0, 'i'},
653
{"certdir", required_argument, 0, 'd'},
654
{"certkey", required_argument, 0, 'c'},
655
{"certfile", required_argument, 0, 'k'},
656
{0, 0, 0, 0} };
657
658
int option_index = 0;
659
ret = getopt_long (argc, argv, "i:", long_options,
660
&option_index);
661
662
if (ret == -1){
663
break;
664
}
665
666
switch(ret){
667
case 0:
668
break;
669
case 'i':
670
interface = optarg;
671
break;
672
case 'd':
673
certdir = optarg;
674
break;
675
case 'c':
676
certfile = optarg;
677
break;
678
case 'k':
679
certkey = optarg;
680
break;
681
default:
682
exit(EXIT_FAILURE);
683
}
684
}
685
686
certfile = combinepath(certdir, certfile);
687
if (certfile == NULL){
688
goto exit;
689
}
690
691
certkey = combinepath(certdir, certkey);
692
if (certkey == NULL){
693
goto exit;
694
}
695
935
696
if (not debug){
936
697
avahi_set_log_function(empty_log);
937
698
}
938
699
939
/* Initialize the pseudo-RNG for Avahi */
700
/* Initialize the psuedo-RNG */
940
701
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",
702
703
/* Allocate main loop object */
704
if (!(simple_poll = avahi_simple_poll_new())) {
705
fprintf(stderr, "Failed to create simple poll object.\n");
706
707
goto exit;
708
}
709
710
/* Do not publish any local records */
711
avahi_server_config_init(&config);
712
config.publish_hinfo = 0;
713
config.publish_addresses = 0;
714
config.publish_workstation = 0;
715
config.publish_domain = 0;
716
717
/* Allocate a new server */
718
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
719
&config, NULL, NULL, &error);
720
721
/* Free the configuration data */
722
avahi_server_config_free(&config);
723
724
/* Check if creating the server object succeeded */
725
if (!server) {
726
fprintf(stderr, "Failed to create server: %s\n",
972
727
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
728
returncode = EXIT_FAILURE;
729
goto exit;
975
730
}
976
731
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
732
/* Create the service browser */
733
sb = avahi_s_service_browser_new(server,
734
(AvahiIfIndex)
735
if_nametoindex(interface),
979
736
AVAHI_PROTO_INET6,
980
737
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
738
browse_callback, server);
739
if (!sb) {
983
740
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
741
avahi_strerror(avahi_server_errno(server)));
742
returncode = EXIT_FAILURE;
743
goto exit;
987
744
}
988
745
989
746
/* Run the main loop */
990
747
991
748
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
749
fprintf(stderr, "Starting avahi loop search\n");
993
750
}
994
751
995
avahi_simple_poll_loop(mc.simple_poll);
752
avahi_simple_poll_loop(simple_poll);
996
753
997
end:
754
exit:
998
755
999
756
if (debug){
1000
757
fprintf(stderr, "%s exiting\n", argv[0]);
1001
758
}
1002
759
1003
760
/* Cleanup things */
1004
if (sb != NULL)
761
if (sb)
1005
762
avahi_s_service_browser_free(sb);
1006
763
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
}
764
if (server)
765
avahi_server_free(server);
766
767
if (simple_poll)
768
avahi_simple_poll_free(simple_poll);
769
free(certfile);
770
free(certkey);
1019
771
1020
return exitcode;
772
return returncode;
1021
773
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0