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- Committer: Björn Påhlsson
- Date: 2008-08-04 16:06:40 UTC
- mfrom: (42 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 44.
- Revision ID: belorn@braxen-20080804160640-omzss34wcs708i0e
merge
- files modified:
- TODO
added
removed
plugins.d/mandosclient.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
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
static const char mandos_protocol_version[] = "1";
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
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
97
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
99
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
101
return 0;
102
}
103
buffer_capacity += BUFFER_SIZE;
104
}
105
return buffer_capacity;
106
}
107
108
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
111
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
87
116
gpgme_data_t dh_crypto, dh_plain;
88
117
gpgme_ctx_t ctx;
89
118
gpgme_error_t rc;
90
119
ssize_t ret;
91
ssize_t new_packet_capacity = 0;
92
ssize_t new_packet_length = 0;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
93
122
gpgme_engine_info_t engine_info;
94
123
95
124
if (debug){
96
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
97
126
}
98
127
99
128
/* Init GPGME */
105
134
return -1;
106
135
}
107
136
108
/* Set GPGME home directory */
137
/* Set GPGME home directory for the OpenPGP engine only */
109
138
rc = gpgme_get_engine_info (&engine_info);
110
139
if (rc != GPG_ERR_NO_ERROR){
111
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
121
150
engine_info = engine_info->next;
122
151
}
123
152
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
125
154
return -1;
126
155
}
127
156
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
157
/* Create new GPGME data buffer from memory cryptotext */
158
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
0);
130
160
if (rc != GPG_ERR_NO_ERROR){
131
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
162
gpgme_strsource(rc), gpgme_strerror(rc));
138
168
if (rc != GPG_ERR_NO_ERROR){
139
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
170
gpgme_strsource(rc), gpgme_strerror(rc));
171
gpgme_data_release(dh_crypto);
141
172
return -1;
142
173
}
143
174
146
177
if (rc != GPG_ERR_NO_ERROR){
147
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
179
gpgme_strsource(rc), gpgme_strerror(rc));
149
return -1;
180
plaintext_length = -1;
181
goto decrypt_end;
150
182
}
151
183
152
/* Decrypt data from the FILE pointer to the plaintext data
153
buffer */
184
/* Decrypt data from the cryptotext data buffer to the plaintext
185
data buffer */
154
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
187
if (rc != GPG_ERR_NO_ERROR){
156
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
189
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
190
plaintext_length = -1;
191
goto decrypt_end;
159
192
}
160
193
161
194
if(debug){
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
163
196
}
164
197
165
198
if (debug){
166
199
gpgme_decrypt_result_t result;
167
200
result = gpgme_op_decrypt_result(ctx);
191
224
}
192
225
}
193
226
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
196
197
227
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
199
229
perror("pgpme_data_seek");
230
plaintext_length = -1;
231
goto decrypt_end;
200
232
}
201
233
202
*new_packet = 0;
234
*plaintext = NULL;
203
235
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;
236
plaintext_capacity = adjustbuffer(plaintext,
237
(size_t)plaintext_length,
238
plaintext_capacity);
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
241
plaintext_length = -1;
242
goto decrypt_end;
213
243
}
214
244
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
245
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
246
BUFFER_SIZE);
217
247
/* Print the data, if any */
218
248
if (ret == 0){
249
/* EOF */
219
250
break;
220
251
}
221
252
if(ret < 0){
222
253
perror("gpgme_data_read");
223
return -1;
254
plaintext_length = -1;
255
goto decrypt_end;
224
256
}
225
new_packet_length += ret;
257
plaintext_length += ret;
226
258
}
227
259
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
/* } */
260
if(debug){
261
fprintf(stderr, "Decrypted password is: ");
262
for(ssize_t i = 0; i < plaintext_length; i++){
263
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
264
}
265
fprintf(stderr, "\n");
266
}
267
268
decrypt_end:
269
270
/* Delete the GPGME cryptotext data buffer */
271
gpgme_data_release(dh_crypto);
235
272
236
273
/* Delete the GPGME plaintext data buffer */
237
274
gpgme_data_release(dh_plain);
238
return new_packet_length;
275
return plaintext_length;
239
276
}
240
277
241
278
static const char * safer_gnutls_strerror (int value) {
245
282
return ret;
246
283
}
247
284
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
285
/* GnuTLS log function callback */
286
static void debuggnutls(__attribute__((unused)) int level,
287
const char* string){
288
fprintf(stderr, "GnuTLS: %s", string);
251
289
}
252
290
253
int initgnutls(encrypted_session *es){
254
const char *err;
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
255
294
int ret;
256
295
257
296
if(debug){
260
299
261
300
if ((ret = gnutls_global_init ())
262
301
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
264
304
return -1;
265
305
}
266
306
267
307
if (debug){
308
/* "Use a log level over 10 to enable all debugging options."
309
* - GnuTLS manual
310
*/
268
311
gnutls_global_set_log_level(11);
269
312
gnutls_global_set_log_function(debuggnutls);
270
313
}
271
314
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
315
/* OpenPGP credentials */
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
274
317
!= GNUTLS_E_SUCCESS) {
275
fprintf (stderr, "memory error: %s\n",
318
fprintf (stderr, "GnuTLS memory error: %s\n",
276
319
safer_gnutls_strerror(ret));
277
320
return -1;
278
321
}
279
322
280
323
if(debug){
281
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
284
327
}
285
328
286
329
ret = gnutls_certificate_set_openpgp_key_file
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
288
331
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",
332
fprintf(stderr,
333
"Error[%d] while reading the OpenPGP key pair ('%s',"
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
294
336
safer_gnutls_strerror(ret));
295
337
return -1;
296
338
}
297
339
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
/* GnuTLS server initialization */
341
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
345
return -1;
346
}
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
351
return -1;
352
}
353
354
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
355
356
return 0;
357
}
358
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
361
int ret;
362
/* GnuTLS session creation */
363
ret = gnutls_init(session, GNUTLS_SERVER);
364
if (ret != GNUTLS_E_SUCCESS){
318
365
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
366
safer_gnutls_strerror(ret));
320
367
}
321
368
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;
369
{
370
const char *err;
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
373
fprintf(stderr, "Syntax error at: %s\n", err);
374
fprintf(stderr, "GnuTLS error: %s\n",
375
safer_gnutls_strerror(ret));
376
return -1;
377
}
328
378
}
329
379
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",
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
381
mc->cred);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
384
safer_gnutls_strerror(ret));
335
385
return -1;
336
386
}
337
387
338
388
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
389
gnutls_certificate_server_set_request (*session,
340
390
GNUTLS_CERT_IGNORE);
341
391
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
343
393
344
394
return 0;
345
395
}
346
396
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
397
/* Avahi log function callback */
398
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
399
__attribute__((unused)) const char *txt){}
349
400
350
int start_mandos_communication(const char *ip, uint16_t port,
351
AvahiIfIndex if_index){
401
/* Called when a Mandos server is found */
402
static int start_mandos_communication(const char *ip, uint16_t port,
403
AvahiIfIndex if_index,
404
mandos_context *mc){
352
405
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
355
407
char *buffer = NULL;
356
408
char *decrypted_buffer;
357
409
size_t buffer_length = 0;
358
410
size_t buffer_capacity = 0;
359
411
ssize_t decrypted_buffer_size;
360
size_t written = 0;
412
size_t written;
361
413
int retval = 0;
362
414
char interface[IF_NAMESIZE];
415
gnutls_session_t session;
416
417
ret = init_gnutls_session (mc, &session);
418
if (ret != 0){
419
return -1;
420
}
363
421
364
422
if(debug){
365
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
371
429
perror("socket");
372
430
return -1;
373
431
}
374
375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(debug){
432
433
if(debug){
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
435
perror("if_indextoname");
436
return -1;
378
437
}
379
return -1;
380
}
381
382
if(debug){
383
438
fprintf(stderr, "Binding to interface %s\n", interface);
384
439
}
385
440
386
441
memset(&to,0,sizeof(to)); /* Spurious warning */
387
to.sin6_family = AF_INET6;
388
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
389
446
if (ret < 0 ){
390
447
perror("inet_pton");
391
448
return -1;
392
}
449
}
393
450
if(ret == 0){
394
451
fprintf(stderr, "Bad address: %s\n", ip);
395
452
return -1;
396
453
}
397
to.sin6_port = htons(port); /* Spurious warning */
454
to.in6.sin6_port = htons(port); /* Spurious warning */
398
455
399
to.sin6_scope_id = (uint32_t)if_index;
456
to.in6.sin6_scope_id = (uint32_t)if_index;
400
457
401
458
if(debug){
402
459
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
/* } */
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
463
perror("inet_ntop");
464
} else {
465
if(strcmp(addrstr, ip) != 0){
466
fprintf(stderr, "Canonical address form: %s\n", addrstr);
467
}
468
}
411
469
}
412
470
413
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
471
ret = connect(tcp_sd, &to.in, sizeof(to));
414
472
if (ret < 0){
415
473
perror("connect");
416
474
return -1;
417
475
}
418
419
ret = initgnutls (&es);
420
if (ret != 0){
421
retval = -1;
422
return -1;
476
477
const char *out = mandos_protocol_version;
478
written = 0;
479
while (true){
480
size_t out_size = strlen(out);
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
482
out_size - written));
483
if (ret == -1){
484
perror("write");
485
retval = -1;
486
goto mandos_end;
487
}
488
written += (size_t)ret;
489
if(written < out_size){
490
continue;
491
} else {
492
if (out == mandos_protocol_version){
493
written = 0;
494
out = "\r\n";
495
} else {
496
break;
497
}
498
}
423
499
}
424
425
gnutls_transport_set_ptr (es.session,
426
(gnutls_transport_ptr_t) tcp_sd);
427
500
428
501
if(debug){
429
502
fprintf(stderr, "Establishing TLS session with %s\n", ip);
430
503
}
431
504
432
ret = gnutls_handshake (es.session);
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
506
507
ret = gnutls_handshake (session);
433
508
434
509
if (ret != GNUTLS_E_SUCCESS){
435
510
if(debug){
436
fprintf(stderr, "\n*** Handshake failed ***\n");
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
437
512
gnutls_perror (ret);
438
513
}
439
514
retval = -1;
440
goto exit;
515
goto mandos_end;
441
516
}
442
517
443
//Retrieve OpenPGP packet that contains the wanted password
518
/* Read OpenPGP packet that contains the wanted password */
444
519
445
520
if(debug){
446
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
448
523
}
449
524
450
525
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;
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
527
buffer_capacity);
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
530
retval = -1;
531
goto mandos_end;
458
532
}
459
533
460
ret = gnutls_record_recv
461
(es.session, buffer+buffer_length, BUFFER_SIZE);
534
ret = gnutls_record_recv(session, buffer+buffer_length,
535
BUFFER_SIZE);
462
536
if (ret == 0){
463
537
break;
464
538
}
468
542
case GNUTLS_E_AGAIN:
469
543
break;
470
544
case GNUTLS_E_REHANDSHAKE:
471
ret = gnutls_handshake (es.session);
545
ret = gnutls_handshake (session);
472
546
if (ret < 0){
473
fprintf(stderr, "\n*** Handshake failed ***\n");
547
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
474
548
gnutls_perror (ret);
475
549
retval = -1;
476
goto exit;
550
goto mandos_end;
477
551
}
478
552
break;
479
553
default:
480
554
fprintf(stderr, "Unknown error while reading data from"
481
" encrypted session with mandos server\n");
555
" encrypted session with Mandos server\n");
482
556
retval = -1;
483
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
484
goto exit;
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
558
goto mandos_end;
485
559
}
486
560
} else {
487
561
buffer_length += (size_t) ret;
488
562
}
489
563
}
490
564
565
if(debug){
566
fprintf(stderr, "Closing TLS session\n");
567
}
568
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
491
571
if (buffer_length > 0){
492
572
decrypted_buffer_size = pgp_packet_decrypt(buffer,
493
573
buffer_length,
494
574
&decrypted_buffer,
495
certdir);
575
keydir);
496
576
if (decrypted_buffer_size >= 0){
577
written = 0;
497
578
while(written < (size_t) decrypted_buffer_size){
498
579
ret = (int)fwrite (decrypted_buffer + written, 1,
499
580
(size_t)decrypted_buffer_size - written,
513
594
retval = -1;
514
595
}
515
596
}
516
517
//shutdown procedure
518
519
if(debug){
520
fprintf(stderr, "Closing TLS session\n");
521
}
522
597
598
/* Shutdown procedure */
599
600
mandos_end:
523
601
free(buffer);
524
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
525
exit:
526
602
close(tcp_sd);
527
gnutls_deinit (es.session);
528
gnutls_certificate_free_credentials (es.cred);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
529
605
gnutls_global_deinit ();
530
606
return retval;
531
607
}
532
608
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
609
static void resolve_callback(AvahiSServiceResolver *r,
610
AvahiIfIndex interface,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
612
AvahiResolverEvent event,
613
const char *name,
614
const char *type,
615
const char *domain,
616
const char *host_name,
617
const AvahiAddress *address,
618
uint16_t port,
619
AVAHI_GCC_UNUSED AvahiStringList *txt,
620
AVAHI_GCC_UNUSED AvahiLookupResultFlags
621
flags,
622
void* userdata) {
623
mandos_context *mc = userdata;
551
624
assert(r); /* Spurious warning */
552
625
553
626
/* Called whenever a service has been resolved successfully or
556
629
switch (event) {
557
630
default:
558
631
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)));
632
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
633
" of type '%s' in domain '%s': %s\n", name, type, domain,
634
avahi_strerror(avahi_server_errno(mc->server)));
562
635
break;
563
636
564
637
case AVAHI_RESOLVER_FOUND:
566
639
char ip[AVAHI_ADDRESS_STR_MAX];
567
640
avahi_address_snprint(ip, sizeof(ip), address);
568
641
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
571
644
}
572
int ret = start_mandos_communication(ip, port, interface);
645
int ret = start_mandos_communication(ip, port, interface, mc);
573
646
if (ret == 0){
574
647
exit(EXIT_SUCCESS);
575
648
}
578
651
avahi_s_service_resolver_free(r);
579
652
}
580
653
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;
654
static void browse_callback( AvahiSServiceBrowser *b,
655
AvahiIfIndex interface,
656
AvahiProtocol protocol,
657
AvahiBrowserEvent event,
658
const char *name,
659
const char *type,
660
const char *domain,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(b); /* Spurious warning */
666
667
/* Called whenever a new services becomes available on the LAN or
668
is removed from the LAN */
669
670
switch (event) {
671
default:
672
case AVAHI_BROWSER_FAILURE:
673
674
fprintf(stderr, "(Avahi browser) %s\n",
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
677
return;
678
679
case AVAHI_BROWSER_NEW:
680
/* We ignore the returned Avahi resolver object. In the callback
681
function we free it. If the Avahi server is terminated before
682
the callback function is called the Avahi server will free the
683
resolver for us. */
684
685
if (!(avahi_s_service_resolver_new(mc->server, interface,
686
protocol, name, type, domain,
687
AVAHI_PROTO_INET6, 0,
688
resolve_callback, mc)))
689
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
690
name, avahi_strerror(avahi_server_errno(mc->server)));
691
break;
692
693
case AVAHI_BROWSER_REMOVE:
694
break;
695
696
case AVAHI_BROWSER_ALL_FOR_NOW:
697
case AVAHI_BROWSER_CACHE_EXHAUSTED:
698
if(debug){
699
fprintf(stderr, "No Mandos server found, still searching...\n");
627
700
}
701
break;
702
}
628
703
}
629
704
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);
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
634
711
if (tmp == NULL){
635
perror("malloc");
636
712
return NULL;
637
713
}
638
strcpy(tmp, first);
639
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
640
strcat(tmp, "/");
641
}
642
strcat(tmp, second);
714
if(f_len > 0){
715
memcpy(tmp, first, f_len); /* Spurious warning */
716
}
717
tmp[f_len] = '/';
718
if(s_len > 0){
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
720
}
721
tmp[f_len + 1 + s_len] = '\0';
643
722
return tmp;
644
723
}
645
724
646
725
647
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
648
AvahiServerConfig config;
726
int main(int argc, char *argv[]){
649
727
AvahiSServiceBrowser *sb = NULL;
650
728
int error;
651
729
int ret;
652
int returncode = EXIT_SUCCESS;
653
const char *interface = NULL;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
733
int sd;
734
uid_t uid;
735
gid_t gid;
736
char *connect_to = NULL;
654
737
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
}
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
742
743
{
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
748
.arg = "IP",
749
.doc = "Connect directly to a sepcified mandos server",
750
.group = 1 },
751
{ .name = "interface", .key = 'i',
752
.arg = "INTERFACE",
753
.doc = "Interface that Avahi will conntect through",
754
.group = 1 },
755
{ .name = "keydir", .key = 'd',
756
.arg = "KEYDIR",
757
.doc = "Directory where the openpgp keyring is",
758
.group = 1 },
759
{ .name = "seckey", .key = 's',
760
.arg = "SECKEY",
761
.doc = "Secret openpgp key for gnutls authentication",
762
.group = 1 },
763
{ .name = "pubkey", .key = 'p',
764
.arg = "PUBKEY",
765
.doc = "Public openpgp key for gnutls authentication",
766
.group = 2 },
767
{ .name = "dh-bits", .key = 129,
768
.arg = "BITS",
769
.doc = "dh-bits to use in gnutls communication",
770
.group = 2 },
771
{ .name = "priority", .key = 130,
772
.arg = "PRIORITY",
773
.doc = "GNUTLS priority", .group = 1 },
774
{ .name = NULL }
775
};
776
777
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
782
switch (key) {
783
case 128:
784
debug = true;
785
break;
786
case 'c':
787
connect_to = arg;
788
break;
789
case 'i':
790
interface = arg;
791
break;
792
case 'd':
793
keydir = arg;
794
break;
795
case 's':
796
seckeyfile = arg;
797
break;
798
case 'p':
799
pubkeyfile = arg;
800
break;
801
case 129:
802
errno = 0;
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
804
if (errno){
805
perror("strtol");
806
exit(EXIT_FAILURE);
807
}
808
break;
809
case 130:
810
mc.priority = arg;
811
break;
812
case ARGP_KEY_ARG:
813
argp_usage (state);
814
break;
815
case ARGP_KEY_END:
816
break;
817
default:
818
return ARGP_ERR_UNKNOWN;
819
}
820
return 0;
821
}
822
823
struct argp argp = { .options = options, .parser = parse_opt,
824
.args_doc = "",
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
828
}
829
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
833
exitcode = EXIT_FAILURE;
834
goto end;
835
}
836
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
840
goto end;
841
}
842
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
844
if (ret == -1){
845
fprintf(stderr, "init_gnutls_global\n");
846
goto end;
847
}
848
849
uid = getuid();
850
gid = getgid();
851
852
ret = setuid(uid);
853
if (ret == -1){
854
perror("setuid");
855
}
856
857
setgid(gid);
858
if (ret == -1){
859
perror("setgid");
860
}
861
862
if_index = (AvahiIfIndex) if_nametoindex(interface);
863
if(if_index == 0){
864
fprintf(stderr, "No such interface: \"%s\"\n", interface);
865
exit(EXIT_FAILURE);
709
866
}
710
867
711
868
if(connect_to != NULL){
714
871
char *address = strrchr(connect_to, ':');
715
872
if(address == NULL){
716
873
fprintf(stderr, "No colon in address\n");
717
exit(EXIT_FAILURE);
874
exitcode = EXIT_FAILURE;
875
goto end;
718
876
}
719
877
errno = 0;
720
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
721
879
if(errno){
722
880
perror("Bad port number");
723
exit(EXIT_FAILURE);
881
exitcode = EXIT_FAILURE;
882
goto end;
724
883
}
725
884
*address = '\0';
726
885
address = connect_to;
727
ret = start_mandos_communication(address, port, if_index);
886
ret = start_mandos_communication(address, port, if_index, &mc);
728
887
if(ret < 0){
729
exit(EXIT_FAILURE);
888
exitcode = EXIT_FAILURE;
730
889
} else {
731
exit(EXIT_SUCCESS);
890
exitcode = EXIT_SUCCESS;
732
891
}
892
goto end;
733
893
}
734
894
735
certkey = combinepath(certdir, certkey);
736
if (certkey == NULL){
737
goto exit;
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
if(ret == -1){
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
738
920
}
739
921
740
922
if (not debug){
741
923
avahi_set_log_function(empty_log);
742
924
}
743
925
744
/* Initialize the psuedo-RNG */
926
/* Initialize the pseudo-RNG for Avahi */
745
927
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",
928
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
933
" object.\n");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
938
{
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
946
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
950
NULL, &error);
951
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
954
}
955
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
771
959
avahi_strerror(error));
772
returncode = EXIT_FAILURE;
773
goto exit;
960
exitcode = EXIT_FAILURE;
961
goto end;
774
962
}
775
963
776
/* Create the service browser */
777
sb = avahi_s_service_browser_new(server, if_index,
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
778
966
AVAHI_PROTO_INET6,
779
967
"_mandos._tcp", NULL, 0,
780
browse_callback, server);
781
if (!sb) {
968
browse_callback, &mc);
969
if (sb == NULL) {
782
970
fprintf(stderr, "Failed to create service browser: %s\n",
783
avahi_strerror(avahi_server_errno(server)));
784
returncode = EXIT_FAILURE;
785
goto exit;
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
973
goto end;
786
974
}
787
975
788
976
/* Run the main loop */
789
977
790
978
if (debug){
791
fprintf(stderr, "Starting avahi loop search\n");
979
fprintf(stderr, "Starting Avahi loop search\n");
792
980
}
793
981
794
avahi_simple_poll_loop(simple_poll);
982
avahi_simple_poll_loop(mc.simple_poll);
795
983
796
exit:
984
end:
797
985
798
986
if (debug){
799
987
fprintf(stderr, "%s exiting\n", argv[0]);
800
988
}
801
989
802
990
/* Cleanup things */
803
if (sb)
991
if (sb != NULL)
804
992
avahi_s_service_browser_free(sb);
805
993
806
if (server)
807
avahi_server_free(server);
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
808
996
809
if (simple_poll)
810
avahi_simple_poll_free(simple_poll);
811
free(certfile);
812
free(certkey);
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
999
free(pubkeyfile);
1000
free(seckeyfile);
813
1001
814
return returncode;
1002
return exitcode;
815
1003
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0