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- Committer: Björn Påhlsson
- Date: 2008-07-22 06:27:12 UTC
- mfrom: (27 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 30.
- Revision ID: belorn@braxen-20080722062712-akkycfgee7pn5syr
merge
- files added:
- ca.pem
- files removed:
- mandos.conf
- 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
71
#ifndef CERT_ROOT
72
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
73
#endif
74
#define CERTFILE CERT_ROOT "openpgp-client.txt"
75
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
75
76
#define BUFFER_SIZE 256
77
#define DH_BITS 1024
76
78
77
79
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
80
83
/* Used for passing in values through the Avahi callback functions */
84
81
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
82
gnutls_session_t session;
87
83
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
84
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){
85
} encrypted_session;
86
87
88
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet, const char *homedir){
118
90
gpgme_data_t dh_crypto, dh_plain;
119
91
gpgme_ctx_t ctx;
120
92
gpgme_error_t rc;
121
93
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
124
96
gpgme_engine_info_t engine_info;
125
97
126
98
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
100
}
129
101
130
102
/* Init GPGME */
131
103
gpgme_check_version(NULL);
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
137
}
104
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
138
105
139
/* Set GPGME home directory for the OpenPGP engine only */
106
/* Set GPGME home directory */
140
107
rc = gpgme_get_engine_info (&engine_info);
141
108
if (rc != GPG_ERR_NO_ERROR){
142
109
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
119
engine_info = engine_info->next;
153
120
}
154
121
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
122
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
123
return -1;
157
124
}
158
125
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
126
/* Create new GPGME data buffer from packet buffer */
127
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
128
if (rc != GPG_ERR_NO_ERROR){
163
129
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
130
gpgme_strsource(rc), gpgme_strerror(rc));
170
136
if (rc != GPG_ERR_NO_ERROR){
171
137
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
138
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
139
return -1;
175
140
}
176
141
179
144
if (rc != GPG_ERR_NO_ERROR){
180
145
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
146
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
147
return -1;
184
148
}
185
149
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
150
/* Decrypt data from the FILE pointer to the plaintext data
151
buffer */
188
152
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
153
if (rc != GPG_ERR_NO_ERROR){
190
154
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
155
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
156
return -1;
194
157
}
195
158
196
159
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
160
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
161
}
199
162
200
163
if (debug){
201
164
gpgme_decrypt_result_t result;
202
165
result = gpgme_op_decrypt_result(ctx);
226
189
}
227
190
}
228
191
192
/* Delete the GPGME FILE pointer cryptotext data buffer */
193
gpgme_data_release(dh_crypto);
194
229
195
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
}
235
236
*plaintext = NULL;
196
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
197
198
*new_packet = 0;
237
199
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;
200
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
201
*new_packet = realloc(*new_packet,
202
(unsigned int)new_packet_capacity
203
+ BUFFER_SIZE);
204
if (*new_packet == NULL){
205
perror("realloc");
206
return -1;
207
}
208
new_packet_capacity += BUFFER_SIZE;
245
209
}
246
210
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
211
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
212
BUFFER_SIZE);
249
213
/* Print the data, if any */
250
214
if (ret == 0){
251
/* EOF */
252
215
break;
253
216
}
254
217
if(ret < 0){
255
218
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
219
return -1;
258
220
}
259
plaintext_length += ret;
221
new_packet_length += ret;
260
222
}
261
223
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);
224
/* FIXME: check characters before printing to screen so to not print
225
terminal control characters */
226
/* if(debug){ */
227
/* fprintf(stderr, "decrypted password is: "); */
228
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
229
/* fprintf(stderr, "\n"); */
230
/* } */
274
231
275
232
/* Delete the GPGME plaintext data buffer */
276
233
gpgme_data_release(dh_plain);
277
return plaintext_length;
234
return new_packet_length;
278
235
}
279
236
280
237
static const char * safer_gnutls_strerror (int value) {
284
241
return ret;
285
242
}
286
243
287
/* GnuTLS log function callback */
288
static void debuggnutls(__attribute__((unused)) int level,
289
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
244
void debuggnutls(__attribute__((unused)) int level,
245
const char* string){
246
fprintf(stderr, "%s", string);
291
247
}
292
248
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
249
int initgnutls(encrypted_session *es){
250
const char *err;
296
251
int ret;
297
252
298
253
if(debug){
299
254
fprintf(stderr, "Initializing GnuTLS\n");
300
255
}
301
256
302
257
if ((ret = gnutls_global_init ())
303
258
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
259
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
260
return -1;
307
261
}
308
262
309
263
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
264
gnutls_global_set_log_level(11);
314
265
gnutls_global_set_log_function(debuggnutls);
315
266
}
316
267
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
268
/* openpgp credentials */
269
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
270
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
271
fprintf (stderr, "memory error: %s\n",
321
272
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
323
273
return -1;
324
274
}
325
275
326
276
if(debug){
327
277
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
278
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
279
KEYFILE);
330
280
}
331
281
332
282
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
283
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
334
284
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",
285
fprintf
286
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
287
" '%s')\n",
288
ret, CERTFILE, KEYFILE);
289
fprintf(stdout, "The Error is: %s\n",
339
290
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){
291
return -1;
292
}
293
294
//GnuTLS server initialization
295
if ((ret = gnutls_dh_params_init (&es->dh_params))
296
!= GNUTLS_E_SUCCESS) {
297
fprintf (stderr, "Error in dh parameter initialization: %s\n",
298
safer_gnutls_strerror(ret));
299
return -1;
300
}
301
302
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in prime generation: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
310
311
// GnuTLS session creation
312
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
313
!= GNUTLS_E_SUCCESS){
375
314
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
315
safer_gnutls_strerror(ret));
377
316
}
378
317
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
}
318
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf(stderr, "Syntax error at: %s\n", err);
321
fprintf(stderr, "GnuTLS error: %s\n",
322
safer_gnutls_strerror(ret));
323
return -1;
389
324
}
390
325
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",
326
if ((ret = gnutls_credentials_set
327
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Error setting a credentials set: %s\n",
395
330
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
397
331
return -1;
398
332
}
399
333
400
334
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
335
gnutls_certificate_server_set_request (es->session,
402
336
GNUTLS_CERT_IGNORE);
403
337
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
338
gnutls_dh_set_prime_bits (es->session, DH_BITS);
405
339
406
340
return 0;
407
341
}
408
342
409
/* Avahi log function callback */
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
__attribute__((unused)) const char *txt){}
343
void empty_log(__attribute__((unused)) AvahiLogLevel level,
344
__attribute__((unused)) const char *txt){}
412
345
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){
346
int start_mandos_communication(const char *ip, uint16_t port,
347
unsigned int if_index){
417
348
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
349
struct sockaddr_in6 to;
350
encrypted_session es;
419
351
char *buffer = NULL;
420
352
char *decrypted_buffer;
421
353
size_t buffer_length = 0;
422
354
size_t buffer_capacity = 0;
423
355
ssize_t decrypted_buffer_size;
424
size_t written;
356
size_t written = 0;
425
357
int retval = 0;
426
358
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
359
434
360
if(debug){
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
436
ip, port);
361
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
437
362
}
438
363
439
364
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
441
366
perror("socket");
442
367
return -1;
443
368
}
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
369
370
if(if_indextoname(if_index, interface) == NULL){
371
if(debug){
447
372
perror("if_indextoname");
448
return -1;
449
373
}
374
return -1;
375
}
376
377
if(debug){
450
378
fprintf(stderr, "Binding to interface %s\n", interface);
451
379
}
452
380
453
381
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);
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
458
384
if (ret < 0 ){
459
385
perror("inet_pton");
460
386
return -1;
461
}
387
}
462
388
if(ret == 0){
463
389
fprintf(stderr, "Bad address: %s\n", ip);
464
390
return -1;
465
391
}
466
to.in6.sin6_port = htons(port); /* Spurious warning */
392
to.sin6_port = htons(port); /* Spurious warning */
467
393
468
to.in6.sin6_scope_id = (uint32_t)if_index;
394
to.sin6_scope_id = (uint32_t)if_index;
469
395
470
396
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
}
397
fprintf(stderr, "Connection to: %s\n", ip);
481
398
}
482
399
483
ret = connect(tcp_sd, &to.in, sizeof(to));
400
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
484
401
if (ret < 0){
485
402
perror("connect");
486
403
return -1;
487
404
}
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
}
405
406
ret = initgnutls (&es);
407
if (ret != 0){
408
retval = -1;
409
return -1;
511
410
}
512
411
412
gnutls_transport_set_ptr (es.session,
413
(gnutls_transport_ptr_t) tcp_sd);
414
513
415
if(debug){
514
416
fprintf(stderr, "Establishing TLS session with %s\n", ip);
515
417
}
516
418
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
419
ret = gnutls_handshake (es.session);
520
420
521
421
if (ret != GNUTLS_E_SUCCESS){
522
422
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
423
fprintf(stderr, "\n*** Handshake failed ***\n");
524
424
gnutls_perror (ret);
525
425
}
526
426
retval = -1;
527
goto mandos_end;
427
goto exit;
528
428
}
529
429
530
/* Read OpenPGP packet that contains the wanted password */
430
//Retrieve OpenPGP packet that contains the wanted password
531
431
532
432
if(debug){
533
433
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
535
435
}
536
436
537
437
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;
438
if (buffer_length + BUFFER_SIZE > buffer_capacity){
439
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
440
if (buffer == NULL){
441
perror("realloc");
442
goto exit;
443
}
444
buffer_capacity += BUFFER_SIZE;
544
445
}
545
446
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
447
ret = gnutls_record_recv
448
(es.session, buffer+buffer_length, BUFFER_SIZE);
548
449
if (ret == 0){
549
450
break;
550
451
}
554
455
case GNUTLS_E_AGAIN:
555
456
break;
556
457
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
458
ret = gnutls_handshake (es.session);
558
459
if (ret < 0){
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
460
fprintf(stderr, "\n*** Handshake failed ***\n");
560
461
gnutls_perror (ret);
561
462
retval = -1;
562
goto mandos_end;
463
goto exit;
563
464
}
564
465
break;
565
466
default:
566
467
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
468
" encrypted session with mandos server\n");
568
469
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
470
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
471
goto exit;
571
472
}
572
473
} else {
573
474
buffer_length += (size_t) ret;
574
475
}
575
476
}
576
477
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
478
if (buffer_length > 0){
584
479
decrypted_buffer_size = pgp_packet_decrypt(buffer,
585
480
buffer_length,
586
481
&decrypted_buffer,
587
keydir);
482
CERT_ROOT);
588
483
if (decrypted_buffer_size >= 0){
589
written = 0;
590
while(written < (size_t) decrypted_buffer_size){
484
while(written < decrypted_buffer_size){
591
485
ret = (int)fwrite (decrypted_buffer + written, 1,
592
486
(size_t)decrypted_buffer_size - written,
593
487
stdout);
606
500
retval = -1;
607
501
}
608
502
}
609
610
/* Shutdown procedure */
611
612
mandos_end:
503
504
//shutdown procedure
505
506
if(debug){
507
fprintf(stderr, "Closing TLS session\n");
508
}
509
613
510
free(buffer);
511
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
512
exit:
614
513
close(tcp_sd);
615
gnutls_deinit (session);
514
gnutls_deinit (es.session);
515
gnutls_certificate_free_credentials (es.cred);
516
gnutls_global_deinit ();
616
517
return retval;
617
518
}
618
519
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;
520
static AvahiSimplePoll *simple_poll = NULL;
521
static AvahiServer *server = NULL;
522
523
static void resolve_callback(
524
AvahiSServiceResolver *r,
525
AvahiIfIndex interface,
526
AVAHI_GCC_UNUSED AvahiProtocol protocol,
527
AvahiResolverEvent event,
528
const char *name,
529
const char *type,
530
const char *domain,
531
const char *host_name,
532
const AvahiAddress *address,
533
uint16_t port,
534
AVAHI_GCC_UNUSED AvahiStringList *txt,
535
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
536
AVAHI_GCC_UNUSED void* userdata) {
537
634
538
assert(r); /* Spurious warning */
635
539
636
540
/* Called whenever a service has been resolved successfully or
639
543
switch (event) {
640
544
default:
641
545
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)));
546
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
547
" type '%s' in domain '%s': %s\n", name, type, domain,
548
avahi_strerror(avahi_server_errno(server)));
645
549
break;
646
550
647
551
case AVAHI_RESOLVER_FOUND:
649
553
char ip[AVAHI_ADDRESS_STR_MAX];
650
554
avahi_address_snprint(ip, sizeof(ip), address);
651
555
if(debug){
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
556
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
557
" port %d\n", name, host_name, ip, port);
654
558
}
655
int ret = start_mandos_communication(ip, port, interface, mc);
559
int ret = start_mandos_communication(ip, port,
560
(unsigned int) interface);
656
561
if (ret == 0){
657
562
exit(EXIT_SUCCESS);
658
563
}
661
566
avahi_s_service_resolver_free(r);
662
567
}
663
568
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");
569
static void browse_callback(
570
AvahiSServiceBrowser *b,
571
AvahiIfIndex interface,
572
AvahiProtocol protocol,
573
AvahiBrowserEvent event,
574
const char *name,
575
const char *type,
576
const char *domain,
577
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
578
void* userdata) {
579
580
AvahiServer *s = userdata;
581
assert(b); /* Spurious warning */
582
583
/* Called whenever a new services becomes available on the LAN or
584
is removed from the LAN */
585
586
switch (event) {
587
default:
588
case AVAHI_BROWSER_FAILURE:
589
590
fprintf(stderr, "(Browser) %s\n",
591
avahi_strerror(avahi_server_errno(server)));
592
avahi_simple_poll_quit(simple_poll);
593
return;
594
595
case AVAHI_BROWSER_NEW:
596
/* We ignore the returned resolver object. In the callback
597
function we free it. If the server is terminated before
598
the callback function is called the server will free
599
the resolver for us. */
600
601
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
602
type, domain,
603
AVAHI_PROTO_INET6, 0,
604
resolve_callback, s)))
605
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
606
avahi_strerror(avahi_server_errno(s)));
607
break;
608
609
case AVAHI_BROWSER_REMOVE:
610
break;
611
612
case AVAHI_BROWSER_ALL_FOR_NOW:
613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
614
break;
710
615
}
711
break;
712
}
713
}
714
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);
721
if (tmp == NULL){
722
return NULL;
723
}
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';
732
return tmp;
733
}
734
735
736
int main(int argc, char *argv[]){
616
}
617
618
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
619
AvahiServerConfig config;
737
620
AvahiSServiceBrowser *sb = NULL;
738
621
int error;
739
622
int ret;
740
int exitcode = EXIT_SUCCESS;
623
int returncode = EXIT_SUCCESS;
741
624
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);
625
626
while (true){
627
static struct option long_options[] = {
628
{"debug", no_argument, (int *)&debug, 1},
629
{"interface", required_argument, 0, 'i'},
630
{0, 0, 0, 0} };
631
632
int option_index = 0;
633
ret = getopt_long (argc, argv, "i:", long_options,
634
&option_index);
635
636
if (ret == -1){
637
break;
638
}
639
640
switch(ret){
641
case 0:
642
break;
643
case 'i':
644
interface = optarg;
645
break;
646
default:
647
exit(EXIT_FAILURE);
648
}
933
649
}
934
650
935
651
if (not debug){
936
652
avahi_set_log_function(empty_log);
937
653
}
938
654
939
/* Initialize the pseudo-RNG for Avahi */
655
/* Initialize the psuedo-RNG */
940
656
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",
657
658
/* Allocate main loop object */
659
if (!(simple_poll = avahi_simple_poll_new())) {
660
fprintf(stderr, "Failed to create simple poll object.\n");
661
662
goto exit;
663
}
664
665
/* Do not publish any local records */
666
avahi_server_config_init(&config);
667
config.publish_hinfo = 0;
668
config.publish_addresses = 0;
669
config.publish_workstation = 0;
670
config.publish_domain = 0;
671
672
/* Allocate a new server */
673
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
674
&config, NULL, NULL, &error);
675
676
/* Free the configuration data */
677
avahi_server_config_free(&config);
678
679
/* Check if creating the server object succeeded */
680
if (!server) {
681
fprintf(stderr, "Failed to create server: %s\n",
972
682
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
683
returncode = EXIT_FAILURE;
684
goto exit;
975
685
}
976
686
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
687
/* Create the service browser */
688
sb = avahi_s_service_browser_new(server,
689
(AvahiIfIndex)
690
if_nametoindex(interface),
979
691
AVAHI_PROTO_INET6,
980
692
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
693
browse_callback, server);
694
if (!sb) {
983
695
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
696
avahi_strerror(avahi_server_errno(server)));
697
returncode = EXIT_FAILURE;
698
goto exit;
987
699
}
988
700
989
701
/* Run the main loop */
990
702
991
703
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
704
fprintf(stderr, "Starting avahi loop search\n");
993
705
}
994
706
995
avahi_simple_poll_loop(mc.simple_poll);
707
avahi_simple_poll_loop(simple_poll);
996
708
997
end:
709
exit:
998
710
999
711
if (debug){
1000
712
fprintf(stderr, "%s exiting\n", argv[0]);
1001
713
}
1002
714
1003
715
/* Cleanup things */
1004
if (sb != NULL)
716
if (sb)
1005
717
avahi_s_service_browser_free(sb);
1006
718
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
}
1019
1020
return exitcode;
719
if (server)
720
avahi_server_free(server);
721
722
if (simple_poll)
723
avahi_simple_poll_free(simple_poll);
724
725
return returncode;
1021
726
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0