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- Committer: Teddy Hogeborn
- Date: 2008-08-07 21:45:41 UTC
- Revision ID: teddy@fukt.bsnet.se-20080807214541-pyg8itw6kphz1dy5
* plugbasedclient.c: Renamed to "mandos-client.c". All users changed.
* plugins.d/mandosclient.c: Renamed to "plugins.d/password-request.c".
All users changed.
* plugins.d/passprompt.c: Renamed to "plugins.d/password-prompt.c".
All users changed.
* server.conf: Renamed to "mandos.conf". All users changed.
* server.py: Renamed to "mandos".
(daemon): Have default values for arguments. Caller changed.
* Makefile (distclean, mostlyclean, maintainer-clean): New aliases for
"clean".
(check, run-client, run-server): New.
* network-protocol.txt: New.
* plugins.d/mandosclient.c: Renamed to "plugins.d/password-request.c".
All users changed.
* plugins.d/passprompt.c: Renamed to "plugins.d/password-prompt.c".
All users changed.
* server.conf: Renamed to "mandos.conf". All users changed.
* server.py: Renamed to "mandos".
(daemon): Have default values for arguments. Caller changed.
* Makefile (distclean, mostlyclean, maintainer-clean): New aliases for
"clean".
(check, run-client, run-server): New.
* network-protocol.txt: New.
- files added:
- network-protocol.txt
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- server.conf => mandos.conf
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
35
37
#include <stdio.h>
36
38
#include <assert.h>
37
39
#include <stdlib.h>
38
40
#include <time.h>
39
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 */
40
46
41
47
#include <avahi-core/core.h>
42
48
#include <avahi-core/lookup.h>
45
51
#include <avahi-common/malloc.h>
46
52
#include <avahi-common/error.h>
47
53
48
//mandos client part
54
/* Mandos client part */
49
55
#include <sys/types.h> /* socket(), inet_pton() */
50
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
57
struct in6_addr, inet_pton() */
58
64
#include <string.h> /* memset */
59
65
#include <arpa/inet.h> /* inet_pton() */
60
66
#include <iso646.h> /* not */
61
62
// 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 */
63
72
#include <errno.h> /* perror() */
64
73
#include <gpgme.h>
65
74
66
// getopt long
67
#include <getopt.h>
68
69
75
#define BUFFER_SIZE 256
70
#define DH_BITS 1024
71
72
const char *certdir = "/conf/conf.d/cryptkeyreq/";
73
const char *certfile = "openpgp-client.txt";
74
const char *certkey = "openpgp-client-key.txt";
75
76
76
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>";
77
82
83
/* Used for passing in values through the Avahi callback functions */
78
84
typedef struct {
79
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
80
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
81
89
gnutls_dh_params_t dh_params;
82
} encrypted_session;
83
84
85
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
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){
87
118
gpgme_data_t dh_crypto, dh_plain;
88
119
gpgme_ctx_t ctx;
89
120
gpgme_error_t rc;
90
121
ssize_t ret;
91
ssize_t new_packet_capacity = 0;
92
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
93
124
gpgme_engine_info_t engine_info;
94
125
95
126
if (debug){
96
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
97
128
}
98
129
99
130
/* Init GPGME */
105
136
return -1;
106
137
}
107
138
108
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
109
140
rc = gpgme_get_engine_info (&engine_info);
110
141
if (rc != GPG_ERR_NO_ERROR){
111
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
121
152
engine_info = engine_info->next;
122
153
}
123
154
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
125
156
return -1;
126
157
}
127
158
128
/* Create new GPGME data buffer from packet buffer */
129
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);
130
162
if (rc != GPG_ERR_NO_ERROR){
131
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
164
gpgme_strsource(rc), gpgme_strerror(rc));
138
170
if (rc != GPG_ERR_NO_ERROR){
139
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
141
174
return -1;
142
175
}
143
176
146
179
if (rc != GPG_ERR_NO_ERROR){
147
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
181
gpgme_strsource(rc), gpgme_strerror(rc));
149
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
150
184
}
151
185
152
/* Decrypt data from the FILE pointer to the plaintext data
153
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
154
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
189
if (rc != GPG_ERR_NO_ERROR){
156
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
191
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
159
194
}
160
195
161
196
if(debug){
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
163
198
}
164
199
165
200
if (debug){
166
201
gpgme_decrypt_result_t result;
167
202
result = gpgme_op_decrypt_result(ctx);
191
226
}
192
227
}
193
228
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
196
197
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
199
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
200
234
}
201
235
202
*new_packet = 0;
236
*plaintext = NULL;
203
237
while(true){
204
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
205
*new_packet = realloc(*new_packet,
206
(unsigned int)new_packet_capacity
207
+ BUFFER_SIZE);
208
if (*new_packet == NULL){
209
perror("realloc");
210
return -1;
211
}
212
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;
213
245
}
214
246
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
248
BUFFER_SIZE);
217
249
/* Print the data, if any */
218
250
if (ret == 0){
251
/* EOF */
219
252
break;
220
253
}
221
254
if(ret < 0){
222
255
perror("gpgme_data_read");
223
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
224
258
}
225
new_packet_length += ret;
259
plaintext_length += ret;
226
260
}
227
261
228
/* FIXME: check characters before printing to screen so to not print
229
terminal control characters */
230
/* if(debug){ */
231
/* fprintf(stderr, "decrypted password is: "); */
232
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
233
/* fprintf(stderr, "\n"); */
234
/* } */
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);
235
274
236
275
/* Delete the GPGME plaintext data buffer */
237
276
gpgme_data_release(dh_plain);
238
return new_packet_length;
277
return plaintext_length;
239
278
}
240
279
241
280
static const char * safer_gnutls_strerror (int value) {
245
284
return ret;
246
285
}
247
286
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
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);
251
291
}
252
292
253
int initgnutls(encrypted_session *es){
254
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
255
296
int ret;
256
297
257
298
if(debug){
260
301
261
302
if ((ret = gnutls_global_init ())
262
303
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
264
306
return -1;
265
307
}
266
308
267
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
268
313
gnutls_global_set_log_level(11);
269
314
gnutls_global_set_log_function(debuggnutls);
270
315
}
271
316
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
274
319
!= GNUTLS_E_SUCCESS) {
275
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
276
321
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
277
323
return -1;
278
324
}
279
325
280
326
if(debug){
281
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
284
330
}
285
331
286
332
ret = gnutls_certificate_set_openpgp_key_file
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
288
334
if (ret != GNUTLS_E_SUCCESS) {
289
fprintf
290
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
291
" '%s')\n",
292
ret, certfile, certkey);
293
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",
294
339
safer_gnutls_strerror(ret));
295
return -1;
296
}
297
298
//GnuTLS server initialization
299
if ((ret = gnutls_dh_params_init (&es->dh_params))
300
!= GNUTLS_E_SUCCESS) {
301
fprintf (stderr, "Error in dh parameter initialization: %s\n",
302
safer_gnutls_strerror(ret));
303
return -1;
304
}
305
306
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
307
!= GNUTLS_E_SUCCESS) {
308
fprintf (stderr, "Error in prime generation: %s\n",
309
safer_gnutls_strerror(ret));
310
return -1;
311
}
312
313
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
314
315
// GnuTLS session creation
316
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
317
!= 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){
318
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
376
safer_gnutls_strerror(ret));
320
377
}
321
378
322
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf(stderr, "Syntax error at: %s\n", err);
325
fprintf(stderr, "GnuTLS error: %s\n",
326
safer_gnutls_strerror(ret));
327
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
}
328
389
}
329
390
330
if ((ret = gnutls_credentials_set
331
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
332
!= GNUTLS_E_SUCCESS) {
333
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",
334
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
335
397
return -1;
336
398
}
337
399
338
400
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
401
gnutls_certificate_server_set_request (*session,
340
402
GNUTLS_CERT_IGNORE);
341
403
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
343
405
344
406
return 0;
345
407
}
346
408
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__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){}
349
412
350
int start_mandos_communication(const char *ip, uint16_t port,
351
AvahiIfIndex if_index){
413
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
352
417
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
355
419
char *buffer = NULL;
356
420
char *decrypted_buffer;
357
421
size_t buffer_length = 0;
358
422
size_t buffer_capacity = 0;
359
423
ssize_t decrypted_buffer_size;
360
size_t written = 0;
424
size_t written;
361
425
int retval = 0;
362
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
}
363
433
364
434
if(debug){
365
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
371
441
perror("socket");
372
442
return -1;
373
443
}
374
375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(debug){
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
447
perror("if_indextoname");
448
return -1;
378
449
}
379
return -1;
380
}
381
382
if(debug){
383
450
fprintf(stderr, "Binding to interface %s\n", interface);
384
451
}
385
452
386
453
memset(&to,0,sizeof(to)); /* Spurious warning */
387
to.sin6_family = AF_INET6;
388
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);
389
458
if (ret < 0 ){
390
459
perror("inet_pton");
391
460
return -1;
392
}
461
}
393
462
if(ret == 0){
394
463
fprintf(stderr, "Bad address: %s\n", ip);
395
464
return -1;
396
465
}
397
to.sin6_port = htons(port); /* Spurious warning */
466
to.in6.sin6_port = htons(port); /* Spurious warning */
398
467
399
to.sin6_scope_id = (uint32_t)if_index;
468
to.in6.sin6_scope_id = (uint32_t)if_index;
400
469
401
470
if(debug){
402
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
403
/* char addrstr[INET6_ADDRSTRLEN]; */
404
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
405
/* sizeof(addrstr)) == NULL){ */
406
/* perror("inet_ntop"); */
407
/* } else { */
408
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
409
/* addrstr, ntohs(to.sin6_port)); */
410
/* } */
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
}
411
481
}
412
482
413
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
414
484
if (ret < 0){
415
485
perror("connect");
416
486
return -1;
417
487
}
418
419
ret = initgnutls (&es);
420
if (ret != 0){
421
retval = -1;
422
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
}
423
511
}
424
425
gnutls_transport_set_ptr (es.session,
426
(gnutls_transport_ptr_t) tcp_sd);
427
512
428
513
if(debug){
429
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
430
515
}
431
516
432
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
433
520
434
521
if (ret != GNUTLS_E_SUCCESS){
435
522
if(debug){
436
fprintf(stderr, "\n*** Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
437
524
gnutls_perror (ret);
438
525
}
439
526
retval = -1;
440
goto exit;
527
goto mandos_end;
441
528
}
442
529
443
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
444
531
445
532
if(debug){
446
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
448
535
}
449
536
450
537
while(true){
451
if (buffer_length + BUFFER_SIZE > buffer_capacity){
452
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
453
if (buffer == NULL){
454
perror("realloc");
455
goto exit;
456
}
457
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;
458
544
}
459
545
460
ret = gnutls_record_recv
461
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
462
548
if (ret == 0){
463
549
break;
464
550
}
468
554
case GNUTLS_E_AGAIN:
469
555
break;
470
556
case GNUTLS_E_REHANDSHAKE:
471
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
472
558
if (ret < 0){
473
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
474
560
gnutls_perror (ret);
475
561
retval = -1;
476
goto exit;
562
goto mandos_end;
477
563
}
478
564
break;
479
565
default:
480
566
fprintf(stderr, "Unknown error while reading data from"
481
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
482
568
retval = -1;
483
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
484
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
485
571
}
486
572
} else {
487
573
buffer_length += (size_t) ret;
488
574
}
489
575
}
490
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
491
583
if (buffer_length > 0){
492
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
493
585
buffer_length,
494
586
&decrypted_buffer,
495
certdir);
587
keydir);
496
588
if (decrypted_buffer_size >= 0){
589
written = 0;
497
590
while(written < (size_t) decrypted_buffer_size){
498
591
ret = (int)fwrite (decrypted_buffer + written, 1,
499
592
(size_t)decrypted_buffer_size - written,
513
606
retval = -1;
514
607
}
515
608
}
516
517
//shutdown procedure
518
519
if(debug){
520
fprintf(stderr, "Closing TLS session\n");
521
}
522
609
610
/* Shutdown procedure */
611
612
mandos_end:
523
613
free(buffer);
524
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
525
exit:
526
614
close(tcp_sd);
527
gnutls_deinit (es.session);
528
gnutls_certificate_free_credentials (es.cred);
529
gnutls_global_deinit ();
615
gnutls_deinit (session);
530
616
return retval;
531
617
}
532
618
533
static AvahiSimplePoll *simple_poll = NULL;
534
static AvahiServer *server = NULL;
535
536
static void resolve_callback(
537
AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
AVAHI_GCC_UNUSED void* userdata) {
550
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;
551
634
assert(r); /* Spurious warning */
552
635
553
636
/* Called whenever a service has been resolved successfully or
556
639
switch (event) {
557
640
default:
558
641
case AVAHI_RESOLVER_FAILURE:
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
561
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)));
562
645
break;
563
646
564
647
case AVAHI_RESOLVER_FOUND:
566
649
char ip[AVAHI_ADDRESS_STR_MAX];
567
650
avahi_address_snprint(ip, sizeof(ip), address);
568
651
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" 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);
571
654
}
572
int ret = start_mandos_communication(ip, port, interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
573
656
if (ret == 0){
574
657
exit(EXIT_SUCCESS);
575
658
}
578
661
avahi_s_service_resolver_free(r);
579
662
}
580
663
581
static void browse_callback(
582
AvahiSServiceBrowser *b,
583
AvahiIfIndex interface,
584
AvahiProtocol protocol,
585
AvahiBrowserEvent event,
586
const char *name,
587
const char *type,
588
const char *domain,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
void* userdata) {
591
592
AvahiServer *s = userdata;
593
assert(b); /* Spurious warning */
594
595
/* Called whenever a new services becomes available on the LAN or
596
is removed from the LAN */
597
598
switch (event) {
599
default:
600
case AVAHI_BROWSER_FAILURE:
601
602
fprintf(stderr, "(Browser) %s\n",
603
avahi_strerror(avahi_server_errno(server)));
604
avahi_simple_poll_quit(simple_poll);
605
return;
606
607
case AVAHI_BROWSER_NEW:
608
/* We ignore the returned resolver object. In the callback
609
function we free it. If the server is terminated before
610
the callback function is called the server will free
611
the resolver for us. */
612
613
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
614
type, domain,
615
AVAHI_PROTO_INET6, 0,
616
resolve_callback, s)))
617
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
618
avahi_strerror(avahi_server_errno(s)));
619
break;
620
621
case AVAHI_BROWSER_REMOVE:
622
break;
623
624
case AVAHI_BROWSER_ALL_FOR_NOW:
625
case AVAHI_BROWSER_CACHE_EXHAUSTED:
626
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");
627
710
}
711
break;
712
}
628
713
}
629
714
630
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
631
const char *combinepath(const char *first, const char *second){
632
char *tmp;
633
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);
634
721
if (tmp == NULL){
635
perror("malloc");
636
722
return NULL;
637
723
}
638
strcpy(tmp, first);
639
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
640
strcat(tmp, "/");
641
}
642
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';
643
732
return tmp;
644
733
}
645
734
646
735
647
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
648
AvahiServerConfig config;
736
int main(int argc, char *argv[]){
649
737
AvahiSServiceBrowser *sb = NULL;
650
738
int error;
651
739
int ret;
652
int returncode = EXIT_SUCCESS;
653
const char *interface = NULL;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
743
int sd;
744
uid_t uid;
745
gid_t gid;
746
char *connect_to = NULL;
654
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
655
char *connect_to = NULL;
656
657
while (true){
658
static struct option long_options[] = {
659
{"debug", no_argument, (int *)&debug, 1},
660
{"connect", required_argument, 0, 'C'},
661
{"interface", required_argument, 0, 'i'},
662
{"certdir", required_argument, 0, 'd'},
663
{"certkey", required_argument, 0, 'c'},
664
{"certfile", required_argument, 0, 'k'},
665
{0, 0, 0, 0} };
666
667
int option_index = 0;
668
ret = getopt_long (argc, argv, "i:", long_options,
669
&option_index);
670
671
if (ret == -1){
672
break;
673
}
674
675
switch(ret){
676
case 0:
677
break;
678
case 'i':
679
interface = optarg;
680
break;
681
case 'C':
682
connect_to = optarg;
683
break;
684
case 'd':
685
certdir = optarg;
686
break;
687
case 'c':
688
certfile = optarg;
689
break;
690
case 'k':
691
certkey = optarg;
692
break;
693
default:
694
exit(EXIT_FAILURE);
695
}
696
}
697
698
certfile = combinepath(certdir, certfile);
699
if (certfile == NULL){
700
goto exit;
701
}
702
703
if(interface != NULL){
704
if_index = (AvahiIfIndex) if_nametoindex(interface);
705
if(if_index == 0){
706
fprintf(stderr, "No such interface: \"%s\"\n", interface);
707
exit(EXIT_FAILURE);
708
}
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);
709
879
}
710
880
711
881
if(connect_to != NULL){
714
884
char *address = strrchr(connect_to, ':');
715
885
if(address == NULL){
716
886
fprintf(stderr, "No colon in address\n");
717
exit(EXIT_FAILURE);
887
exitcode = EXIT_FAILURE;
888
goto end;
718
889
}
719
890
errno = 0;
720
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
721
892
if(errno){
722
893
perror("Bad port number");
723
exit(EXIT_FAILURE);
894
exitcode = EXIT_FAILURE;
895
goto end;
724
896
}
725
897
*address = '\0';
726
898
address = connect_to;
727
ret = start_mandos_communication(address, port, if_index);
899
ret = start_mandos_communication(address, port, if_index, &mc);
728
900
if(ret < 0){
729
exit(EXIT_FAILURE);
901
exitcode = EXIT_FAILURE;
730
902
} else {
731
exit(EXIT_SUCCESS);
903
exitcode = EXIT_SUCCESS;
732
904
}
905
goto end;
733
906
}
734
907
735
certkey = combinepath(certdir, certkey);
736
if (certkey == NULL){
737
goto exit;
908
/* If the interface is down, bring it up */
909
{
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
911
if(sd < 0) {
912
perror("socket");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
918
if(ret == -1){
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
926
if(ret == -1){
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
929
goto end;
930
}
931
}
932
close(sd);
738
933
}
739
934
740
935
if (not debug){
741
936
avahi_set_log_function(empty_log);
742
937
}
743
938
744
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
745
940
srand((unsigned int) time(NULL));
746
747
/* Allocate main loop object */
748
if (!(simple_poll = avahi_simple_poll_new())) {
749
fprintf(stderr, "Failed to create simple poll object.\n");
750
751
goto exit;
752
}
753
754
/* Do not publish any local records */
755
avahi_server_config_init(&config);
756
config.publish_hinfo = 0;
757
config.publish_addresses = 0;
758
config.publish_workstation = 0;
759
config.publish_domain = 0;
760
761
/* Allocate a new server */
762
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
763
&config, NULL, NULL, &error);
764
765
/* Free the configuration data */
766
avahi_server_config_free(&config);
767
768
/* Check if creating the server object succeeded */
769
if (!server) {
770
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",
771
972
avahi_strerror(error));
772
returncode = EXIT_FAILURE;
773
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
774
975
}
775
976
776
/* Create the service browser */
777
sb = avahi_s_service_browser_new(server, if_index,
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
778
979
AVAHI_PROTO_INET6,
779
980
"_mandos._tcp", NULL, 0,
780
browse_callback, server);
781
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
782
983
fprintf(stderr, "Failed to create service browser: %s\n",
783
avahi_strerror(avahi_server_errno(server)));
784
returncode = EXIT_FAILURE;
785
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
786
987
}
787
988
788
989
/* Run the main loop */
789
990
790
991
if (debug){
791
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
792
993
}
793
994
794
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
795
996
796
exit:
997
end:
797
998
798
999
if (debug){
799
1000
fprintf(stderr, "%s exiting\n", argv[0]);
800
1001
}
801
1002
802
1003
/* Cleanup things */
803
if (sb)
1004
if (sb != NULL)
804
1005
avahi_s_service_browser_free(sb);
805
1006
806
if (server)
807
avahi_server_free(server);
808
809
if (simple_poll)
810
avahi_simple_poll_free(simple_poll);
811
free(certfile);
812
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
}
813
1019
814
return returncode;
1020
return exitcode;
815
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0