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- Committer: Björn Påhlsson
- Date: 2008-08-04 21:27:53 UTC
- mfrom: (45 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 46.
- Revision ID: belorn@braxen-20080804212753-rdghixnyfxb7w3u5
merge
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 */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
42
46
43
47
#include <avahi-core/core.h>
44
48
#include <avahi-core/lookup.h>
47
51
#include <avahi-common/malloc.h>
48
52
#include <avahi-common/error.h>
49
53
50
//mandos client part
54
/* Mandos client part */
51
55
#include <sys/types.h> /* socket(), inet_pton() */
52
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
57
struct in6_addr, inet_pton() */
60
64
#include <string.h> /* memset */
61
65
#include <arpa/inet.h> /* inet_pton() */
62
66
#include <iso646.h> /* not */
63
64
// 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 */
65
72
#include <errno.h> /* perror() */
66
73
#include <gpgme.h>
67
74
68
// getopt long
69
#include <getopt.h>
70
71
75
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
74
static const char *certdir = "/conf/conf.d/mandos";
75
static const char *certfile = "openpgp-client.txt";
76
static const char *certkey = "openpgp-client-key.txt";
77
76
78
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>";
79
82
83
/* Used for passing in values through the Avahi callback functions */
80
84
typedef struct {
81
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
82
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
83
89
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
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,
89
117
const char *homedir){
90
118
gpgme_data_t dh_crypto, dh_plain;
91
119
gpgme_ctx_t ctx;
92
120
gpgme_error_t rc;
93
121
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
96
124
gpgme_engine_info_t engine_info;
97
125
98
126
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
100
128
}
101
129
102
130
/* Init GPGME */
108
136
return -1;
109
137
}
110
138
111
/* Set GPGME home directory */
139
/* Set GPGME home directory for the OpenPGP engine only */
112
140
rc = gpgme_get_engine_info (&engine_info);
113
141
if (rc != GPG_ERR_NO_ERROR){
114
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
152
engine_info = engine_info->next;
125
153
}
126
154
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
128
156
return -1;
129
157
}
130
158
131
/* Create new GPGME data buffer from packet buffer */
132
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);
133
162
if (rc != GPG_ERR_NO_ERROR){
134
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
164
gpgme_strsource(rc), gpgme_strerror(rc));
141
170
if (rc != GPG_ERR_NO_ERROR){
142
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
144
174
return -1;
145
175
}
146
176
149
179
if (rc != GPG_ERR_NO_ERROR){
150
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
181
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
182
plaintext_length = -1;
183
goto decrypt_end;
153
184
}
154
185
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
157
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
189
if (rc != GPG_ERR_NO_ERROR){
159
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
191
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
192
plaintext_length = -1;
193
goto decrypt_end;
162
194
}
163
195
164
196
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
166
198
}
167
199
168
200
if (debug){
169
201
gpgme_decrypt_result_t result;
170
202
result = gpgme_op_decrypt_result(ctx);
194
226
}
195
227
}
196
228
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
199
200
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
231
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
203
234
}
204
235
205
*new_packet = 0;
236
*plaintext = NULL;
206
237
while(true){
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
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;
216
245
}
217
246
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
248
BUFFER_SIZE);
220
249
/* Print the data, if any */
221
250
if (ret == 0){
251
/* EOF */
222
252
break;
223
253
}
224
254
if(ret < 0){
225
255
perror("gpgme_data_read");
226
return -1;
256
plaintext_length = -1;
257
goto decrypt_end;
227
258
}
228
new_packet_length += ret;
259
plaintext_length += ret;
229
260
}
230
261
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
233
/* if(debug){ */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
237
/* } */
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);
238
274
239
275
/* Delete the GPGME plaintext data buffer */
240
276
gpgme_data_release(dh_plain);
241
return new_packet_length;
277
return plaintext_length;
242
278
}
243
279
244
280
static const char * safer_gnutls_strerror (int value) {
248
284
return ret;
249
285
}
250
286
287
/* GnuTLS log function callback */
251
288
static void debuggnutls(__attribute__((unused)) int level,
252
289
const char* string){
253
fprintf(stderr, "%s", string);
290
fprintf(stderr, "GnuTLS: %s", string);
254
291
}
255
292
256
static int initgnutls(encrypted_session *es){
257
const char *err;
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
258
296
int ret;
259
297
260
298
if(debug){
263
301
264
302
if ((ret = gnutls_global_init ())
265
303
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
267
306
return -1;
268
307
}
269
308
270
309
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
271
313
gnutls_global_set_log_level(11);
272
314
gnutls_global_set_log_function(debuggnutls);
273
315
}
274
316
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
277
319
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
320
fprintf (stderr, "GnuTLS memory error: %s\n",
279
321
safer_gnutls_strerror(ret));
280
322
return -1;
281
323
}
282
324
283
325
if(debug){
284
326
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", certfile,
286
certkey);
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
287
329
}
288
330
289
331
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
333
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, certfile, certkey);
296
fprintf(stdout, "The Error is: %s\n",
334
fprintf(stderr,
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
297
338
safer_gnutls_strerror(ret));
298
339
return -1;
299
340
}
300
341
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
342
/* GnuTLS server initialization */
343
ret = gnutls_dh_params_init(&mc->dh_params);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
347
return -1;
348
}
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
353
return -1;
354
}
355
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
357
358
return 0;
359
}
360
361
static int init_gnutls_session(mandos_context *mc,
362
gnutls_session_t *session){
363
int ret;
364
/* GnuTLS session creation */
365
ret = gnutls_init(session, GNUTLS_SERVER);
366
if (ret != GNUTLS_E_SUCCESS){
321
367
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
368
safer_gnutls_strerror(ret));
323
369
}
324
370
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
330
return -1;
371
{
372
const char *err;
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf(stderr, "Syntax error at: %s\n", err);
376
fprintf(stderr, "GnuTLS error: %s\n",
377
safer_gnutls_strerror(ret));
378
return -1;
379
}
331
380
}
332
381
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
383
mc->cred);
384
if (ret != GNUTLS_E_SUCCESS) {
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
337
386
safer_gnutls_strerror(ret));
338
387
return -1;
339
388
}
340
389
341
390
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
391
gnutls_certificate_server_set_request (*session,
343
392
GNUTLS_CERT_IGNORE);
344
393
345
gnutls_dh_set_prime_bits (es->session, DH_BITS);
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
346
395
347
396
return 0;
348
397
}
349
398
399
/* Avahi log function callback */
350
400
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
401
__attribute__((unused)) const char *txt){}
352
402
403
/* Called when a Mandos server is found */
353
404
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
405
AvahiIfIndex if_index,
406
mandos_context *mc){
355
407
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
358
409
char *buffer = NULL;
359
410
char *decrypted_buffer;
360
411
size_t buffer_length = 0;
361
412
size_t buffer_capacity = 0;
362
413
ssize_t decrypted_buffer_size;
363
size_t written = 0;
414
size_t written;
364
415
int retval = 0;
365
416
char interface[IF_NAMESIZE];
417
gnutls_session_t session;
418
419
ret = init_gnutls_session (mc, &session);
420
if (ret != 0){
421
return -1;
422
}
366
423
367
424
if(debug){
368
425
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
377
434
378
435
if(debug){
379
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
437
perror("if_indextoname");
383
438
return -1;
384
439
}
385
386
440
fprintf(stderr, "Binding to interface %s\n", interface);
387
441
}
388
442
389
443
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
444
to.in6.sin6_family = AF_INET6;
445
/* It would be nice to have a way to detect if we were passed an
446
IPv4 address here. Now we assume an IPv6 address. */
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
392
448
if (ret < 0 ){
393
449
perror("inet_pton");
394
450
return -1;
395
}
451
}
396
452
if(ret == 0){
397
453
fprintf(stderr, "Bad address: %s\n", ip);
398
454
return -1;
399
455
}
400
to.sin6_port = htons(port); /* Spurious warning */
456
to.in6.sin6_port = htons(port); /* Spurious warning */
401
457
402
to.sin6_scope_id = (uint32_t)if_index;
458
to.in6.sin6_scope_id = (uint32_t)if_index;
403
459
404
460
if(debug){
405
461
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
/* char addrstr[INET6_ADDRSTRLEN]; */
407
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
408
/* sizeof(addrstr)) == NULL){ */
409
/* perror("inet_ntop"); */
410
/* } else { */
411
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
412
/* addrstr, ntohs(to.sin6_port)); */
413
/* } */
462
char addrstr[INET6_ADDRSTRLEN] = "";
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
464
sizeof(addrstr)) == NULL){
465
perror("inet_ntop");
466
} else {
467
if(strcmp(addrstr, ip) != 0){
468
fprintf(stderr, "Canonical address form: %s\n", addrstr);
469
}
470
}
414
471
}
415
472
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
473
ret = connect(tcp_sd, &to.in, sizeof(to));
417
474
if (ret < 0){
418
475
perror("connect");
419
476
return -1;
420
477
}
421
422
ret = initgnutls (&es);
423
if (ret != 0){
424
retval = -1;
425
return -1;
478
479
const char *out = mandos_protocol_version;
480
written = 0;
481
while (true){
482
size_t out_size = strlen(out);
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
484
out_size - written));
485
if (ret == -1){
486
perror("write");
487
retval = -1;
488
goto mandos_end;
489
}
490
written += (size_t)ret;
491
if(written < out_size){
492
continue;
493
} else {
494
if (out == mandos_protocol_version){
495
written = 0;
496
out = "\r\n";
497
} else {
498
break;
499
}
500
}
426
501
}
427
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
430
502
431
503
if(debug){
432
504
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
505
}
434
506
435
ret = gnutls_handshake (es.session);
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
436
510
437
511
if (ret != GNUTLS_E_SUCCESS){
438
512
if(debug){
439
fprintf(stderr, "\n*** Handshake failed ***\n");
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
440
514
gnutls_perror (ret);
441
515
}
442
516
retval = -1;
443
goto exit;
517
goto mandos_end;
444
518
}
445
519
446
//Retrieve OpenPGP packet that contains the wanted password
520
/* Read OpenPGP packet that contains the wanted password */
447
521
448
522
if(debug){
449
523
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
451
525
}
452
526
453
527
while(true){
454
if (buffer_length + BUFFER_SIZE > buffer_capacity){
455
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
456
if (buffer == NULL){
457
perror("realloc");
458
goto exit;
459
}
460
buffer_capacity += BUFFER_SIZE;
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
529
buffer_capacity);
530
if (buffer_capacity == 0){
531
perror("adjustbuffer");
532
retval = -1;
533
goto mandos_end;
461
534
}
462
535
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
465
538
if (ret == 0){
466
539
break;
467
540
}
471
544
case GNUTLS_E_AGAIN:
472
545
break;
473
546
case GNUTLS_E_REHANDSHAKE:
474
ret = gnutls_handshake (es.session);
547
ret = gnutls_handshake (session);
475
548
if (ret < 0){
476
fprintf(stderr, "\n*** Handshake failed ***\n");
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
477
550
gnutls_perror (ret);
478
551
retval = -1;
479
goto exit;
552
goto mandos_end;
480
553
}
481
554
break;
482
555
default:
483
556
fprintf(stderr, "Unknown error while reading data from"
484
" encrypted session with mandos server\n");
557
" encrypted session with Mandos server\n");
485
558
retval = -1;
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
487
goto exit;
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
560
goto mandos_end;
488
561
}
489
562
} else {
490
563
buffer_length += (size_t) ret;
491
564
}
492
565
}
493
566
567
if(debug){
568
fprintf(stderr, "Closing TLS session\n");
569
}
570
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
572
494
573
if (buffer_length > 0){
495
574
decrypted_buffer_size = pgp_packet_decrypt(buffer,
496
575
buffer_length,
497
576
&decrypted_buffer,
498
certdir);
577
keydir);
499
578
if (decrypted_buffer_size >= 0){
579
written = 0;
500
580
while(written < (size_t) decrypted_buffer_size){
501
581
ret = (int)fwrite (decrypted_buffer + written, 1,
502
582
(size_t)decrypted_buffer_size - written,
516
596
retval = -1;
517
597
}
518
598
}
519
520
//shutdown procedure
521
522
if(debug){
523
fprintf(stderr, "Closing TLS session\n");
524
}
525
599
600
/* Shutdown procedure */
601
602
mandos_end:
526
603
free(buffer);
527
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
exit:
529
604
close(tcp_sd);
530
gnutls_deinit (es.session);
531
gnutls_certificate_free_credentials (es.cred);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
532
607
gnutls_global_deinit ();
533
608
return retval;
534
609
}
535
610
536
static AvahiSimplePoll *simple_poll = NULL;
537
static AvahiServer *server = NULL;
538
539
static void resolve_callback(
540
AvahiSServiceResolver *r,
541
AvahiIfIndex interface,
542
AVAHI_GCC_UNUSED AvahiProtocol protocol,
543
AvahiResolverEvent event,
544
const char *name,
545
const char *type,
546
const char *domain,
547
const char *host_name,
548
const AvahiAddress *address,
549
uint16_t port,
550
AVAHI_GCC_UNUSED AvahiStringList *txt,
551
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
552
AVAHI_GCC_UNUSED void* userdata) {
553
611
static void resolve_callback(AvahiSServiceResolver *r,
612
AvahiIfIndex interface,
613
AVAHI_GCC_UNUSED AvahiProtocol protocol,
614
AvahiResolverEvent event,
615
const char *name,
616
const char *type,
617
const char *domain,
618
const char *host_name,
619
const AvahiAddress *address,
620
uint16_t port,
621
AVAHI_GCC_UNUSED AvahiStringList *txt,
622
AVAHI_GCC_UNUSED AvahiLookupResultFlags
623
flags,
624
void* userdata) {
625
mandos_context *mc = userdata;
554
626
assert(r); /* Spurious warning */
555
627
556
628
/* Called whenever a service has been resolved successfully or
559
631
switch (event) {
560
632
default:
561
633
case AVAHI_RESOLVER_FAILURE:
562
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
563
" type '%s' in domain '%s': %s\n", name, type, domain,
564
avahi_strerror(avahi_server_errno(server)));
634
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
635
" of type '%s' in domain '%s': %s\n", name, type, domain,
636
avahi_strerror(avahi_server_errno(mc->server)));
565
637
break;
566
638
567
639
case AVAHI_RESOLVER_FOUND:
569
641
char ip[AVAHI_ADDRESS_STR_MAX];
570
642
avahi_address_snprint(ip, sizeof(ip), address);
571
643
if(debug){
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" port %d\n", name, host_name, ip, port);
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
574
646
}
575
int ret = start_mandos_communication(ip, port, interface);
647
int ret = start_mandos_communication(ip, port, interface, mc);
576
648
if (ret == 0){
577
649
exit(EXIT_SUCCESS);
578
650
}
581
653
avahi_s_service_resolver_free(r);
582
654
}
583
655
584
static void browse_callback(
585
AvahiSServiceBrowser *b,
586
AvahiIfIndex interface,
587
AvahiProtocol protocol,
588
AvahiBrowserEvent event,
589
const char *name,
590
const char *type,
591
const char *domain,
592
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
593
void* userdata) {
594
595
AvahiServer *s = userdata;
596
assert(b); /* Spurious warning */
597
598
/* Called whenever a new services becomes available on the LAN or
599
is removed from the LAN */
600
601
switch (event) {
602
default:
603
case AVAHI_BROWSER_FAILURE:
604
605
fprintf(stderr, "(Browser) %s\n",
606
avahi_strerror(avahi_server_errno(server)));
607
avahi_simple_poll_quit(simple_poll);
608
return;
609
610
case AVAHI_BROWSER_NEW:
611
/* We ignore the returned resolver object. In the callback
612
function we free it. If the server is terminated before
613
the callback function is called the server will free
614
the resolver for us. */
615
616
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
617
type, domain,
618
AVAHI_PROTO_INET6, 0,
619
resolve_callback, s)))
620
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
621
avahi_strerror(avahi_server_errno(s)));
622
break;
623
624
case AVAHI_BROWSER_REMOVE:
625
break;
626
627
case AVAHI_BROWSER_ALL_FOR_NOW:
628
case AVAHI_BROWSER_CACHE_EXHAUSTED:
629
break;
656
static void browse_callback( AvahiSServiceBrowser *b,
657
AvahiIfIndex interface,
658
AvahiProtocol protocol,
659
AvahiBrowserEvent event,
660
const char *name,
661
const char *type,
662
const char *domain,
663
AVAHI_GCC_UNUSED AvahiLookupResultFlags
664
flags,
665
void* userdata) {
666
mandos_context *mc = userdata;
667
assert(b); /* Spurious warning */
668
669
/* Called whenever a new services becomes available on the LAN or
670
is removed from the LAN */
671
672
switch (event) {
673
default:
674
case AVAHI_BROWSER_FAILURE:
675
676
fprintf(stderr, "(Avahi browser) %s\n",
677
avahi_strerror(avahi_server_errno(mc->server)));
678
avahi_simple_poll_quit(mc->simple_poll);
679
return;
680
681
case AVAHI_BROWSER_NEW:
682
/* We ignore the returned Avahi resolver object. In the callback
683
function we free it. If the Avahi server is terminated before
684
the callback function is called the Avahi server will free the
685
resolver for us. */
686
687
if (!(avahi_s_service_resolver_new(mc->server, interface,
688
protocol, name, type, domain,
689
AVAHI_PROTO_INET6, 0,
690
resolve_callback, mc)))
691
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
692
name, avahi_strerror(avahi_server_errno(mc->server)));
693
break;
694
695
case AVAHI_BROWSER_REMOVE:
696
break;
697
698
case AVAHI_BROWSER_ALL_FOR_NOW:
699
case AVAHI_BROWSER_CACHE_EXHAUSTED:
700
if(debug){
701
fprintf(stderr, "No Mandos server found, still searching...\n");
630
702
}
703
break;
704
}
631
705
}
632
706
633
707
/* Combines file name and path and returns the malloced new
640
714
return NULL;
641
715
}
642
716
if(f_len > 0){
643
memcpy(tmp, first, f_len);
717
memcpy(tmp, first, f_len); /* Spurious warning */
644
718
}
645
719
tmp[f_len] = '/';
646
720
if(s_len > 0){
647
memcpy(tmp + f_len + 1, second, s_len);
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
648
722
}
649
723
tmp[f_len + 1 + s_len] = '\0';
650
724
return tmp;
651
725
}
652
726
653
727
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
728
int main(int argc, char *argv[]){
656
729
AvahiSServiceBrowser *sb = NULL;
657
730
int error;
658
731
int ret;
659
int returncode = EXIT_SUCCESS;
732
int exitcode = EXIT_SUCCESS;
660
733
const char *interface = "eth0";
661
734
struct ifreq network;
662
735
int sd;
736
uid_t uid;
737
gid_t gid;
663
738
char *connect_to = NULL;
664
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
666
while (true){
667
static struct option long_options[] = {
668
{"debug", no_argument, (int *)&debug, 1},
669
{"connect", required_argument, 0, 'C'},
670
{"interface", required_argument, 0, 'i'},
671
{"certdir", required_argument, 0, 'd'},
672
{"certkey", required_argument, 0, 'c'},
673
{"certfile", required_argument, 0, 'k'},
674
{0, 0, 0, 0} };
675
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
678
&option_index);
679
680
if (ret == -1){
681
break;
682
}
683
684
switch(ret){
685
case 0:
686
break;
687
case 'i':
688
interface = optarg;
689
break;
690
case 'C':
691
connect_to = optarg;
692
break;
693
case 'd':
694
certdir = optarg;
695
break;
696
case 'c':
697
certfile = optarg;
698
break;
699
case 'k':
700
certkey = optarg;
701
break;
702
default:
703
exit(EXIT_FAILURE);
704
}
705
}
706
707
certfile = combinepath(certdir, certfile);
708
if (certfile == NULL){
709
perror("combinepath");
710
returncode = EXIT_FAILURE;
711
goto exit;
712
}
713
714
certkey = combinepath(certdir, certkey);
715
if (certkey == NULL){
716
perror("combinepath");
717
returncode = EXIT_FAILURE;
718
goto exit;
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
743
.dh_bits = 1024, .priority = "SECURE256"};
744
745
{
746
struct argp_option options[] = {
747
{ .name = "debug", .key = 128,
748
.doc = "Debug mode", .group = 3 },
749
{ .name = "connect", .key = 'c',
750
.arg = "IP",
751
.doc = "Connect directly to a sepcified mandos server",
752
.group = 1 },
753
{ .name = "interface", .key = 'i',
754
.arg = "INTERFACE",
755
.doc = "Interface that Avahi will conntect through",
756
.group = 1 },
757
{ .name = "keydir", .key = 'd',
758
.arg = "KEYDIR",
759
.doc = "Directory where the openpgp keyring is",
760
.group = 1 },
761
{ .name = "seckey", .key = 's',
762
.arg = "SECKEY",
763
.doc = "Secret openpgp key for gnutls authentication",
764
.group = 1 },
765
{ .name = "pubkey", .key = 'p',
766
.arg = "PUBKEY",
767
.doc = "Public openpgp key for gnutls authentication",
768
.group = 2 },
769
{ .name = "dh-bits", .key = 129,
770
.arg = "BITS",
771
.doc = "dh-bits to use in gnutls communication",
772
.group = 2 },
773
{ .name = "priority", .key = 130,
774
.arg = "PRIORITY",
775
.doc = "GNUTLS priority", .group = 1 },
776
{ .name = NULL }
777
};
778
779
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
784
switch (key) {
785
case 128:
786
debug = true;
787
break;
788
case 'c':
789
connect_to = arg;
790
break;
791
case 'i':
792
interface = arg;
793
break;
794
case 'd':
795
keydir = arg;
796
break;
797
case 's':
798
seckeyfile = arg;
799
break;
800
case 'p':
801
pubkeyfile = arg;
802
break;
803
case 129:
804
errno = 0;
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
if (errno){
807
perror("strtol");
808
exit(EXIT_FAILURE);
809
}
810
break;
811
case 130:
812
mc.priority = arg;
813
break;
814
case ARGP_KEY_ARG:
815
argp_usage (state);
816
break;
817
case ARGP_KEY_END:
818
break;
819
default:
820
return ARGP_ERR_UNKNOWN;
821
}
822
return 0;
823
}
824
825
struct argp argp = { .options = options, .parser = parse_opt,
826
.args_doc = "",
827
.doc = "Mandos client -- Get and decrypt"
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
}
831
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
835
exitcode = EXIT_FAILURE;
836
goto end;
837
}
838
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
842
goto end;
843
}
844
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
846
if (ret == -1){
847
fprintf(stderr, "init_gnutls_global\n");
848
goto end;
849
}
850
851
uid = getuid();
852
gid = getgid();
853
854
ret = setuid(uid);
855
if (ret == -1){
856
perror("setuid");
857
}
858
859
setgid(gid);
860
if (ret == -1){
861
perror("setgid");
719
862
}
720
863
721
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
730
873
char *address = strrchr(connect_to, ':');
731
874
if(address == NULL){
732
875
fprintf(stderr, "No colon in address\n");
733
exit(EXIT_FAILURE);
876
exitcode = EXIT_FAILURE;
877
goto end;
734
878
}
735
879
errno = 0;
736
880
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
737
881
if(errno){
738
882
perror("Bad port number");
739
exit(EXIT_FAILURE);
883
exitcode = EXIT_FAILURE;
884
goto end;
740
885
}
741
886
*address = '\0';
742
887
address = connect_to;
743
ret = start_mandos_communication(address, port, if_index);
888
ret = start_mandos_communication(address, port, if_index, &mc);
744
889
if(ret < 0){
745
exit(EXIT_FAILURE);
890
exitcode = EXIT_FAILURE;
746
891
} else {
747
exit(EXIT_SUCCESS);
892
exitcode = EXIT_SUCCESS;
748
893
}
894
goto end;
749
895
}
750
896
751
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
752
if(sd < 0) {
753
perror("socket");
754
returncode = EXIT_FAILURE;
755
goto exit;
756
}
757
strcpy(network.ifr_name, interface);
758
ret = ioctl(sd, SIOCGIFFLAGS, &network);
759
if(ret == -1){
760
761
perror("ioctl SIOCGIFFLAGS");
762
returncode = EXIT_FAILURE;
763
goto exit;
764
}
765
if((network.ifr_flags & IFF_UP) == 0){
766
network.ifr_flags |= IFF_UP;
767
ret = ioctl(sd, SIOCSIFFLAGS, &network);
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
768
907
if(ret == -1){
769
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
771
goto exit;
772
}
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
773
922
}
774
close(sd);
775
923
776
924
if (not debug){
777
925
avahi_set_log_function(empty_log);
778
926
}
779
927
780
/* Initialize the psuedo-RNG */
928
/* Initialize the pseudo-RNG for Avahi */
781
929
srand((unsigned int) time(NULL));
782
783
/* Allocate main loop object */
784
if (!(simple_poll = avahi_simple_poll_new())) {
785
fprintf(stderr, "Failed to create simple poll object.\n");
786
returncode = EXIT_FAILURE;
787
goto exit;
788
}
789
790
/* Do not publish any local records */
791
avahi_server_config_init(&config);
792
config.publish_hinfo = 0;
793
config.publish_addresses = 0;
794
config.publish_workstation = 0;
795
config.publish_domain = 0;
796
797
/* Allocate a new server */
798
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
799
&config, NULL, NULL, &error);
800
801
/* Free the configuration data */
802
avahi_server_config_free(&config);
803
804
/* Check if creating the server object succeeded */
805
if (!server) {
806
fprintf(stderr, "Failed to create server: %s\n",
930
931
/* Allocate main Avahi loop object */
932
mc.simple_poll = avahi_simple_poll_new();
933
if (mc.simple_poll == NULL) {
934
fprintf(stderr, "Avahi: Failed to create simple poll"
935
" object.\n");
936
exitcode = EXIT_FAILURE;
937
goto end;
938
}
939
940
{
941
AvahiServerConfig config;
942
/* Do not publish any local Zeroconf records */
943
avahi_server_config_init(&config);
944
config.publish_hinfo = 0;
945
config.publish_addresses = 0;
946
config.publish_workstation = 0;
947
config.publish_domain = 0;
948
949
/* Allocate a new server */
950
mc.server = avahi_server_new(avahi_simple_poll_get
951
(mc.simple_poll), &config, NULL,
952
NULL, &error);
953
954
/* Free the Avahi configuration data */
955
avahi_server_config_free(&config);
956
}
957
958
/* Check if creating the Avahi server object succeeded */
959
if (mc.server == NULL) {
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
807
961
avahi_strerror(error));
808
returncode = EXIT_FAILURE;
809
goto exit;
962
exitcode = EXIT_FAILURE;
963
goto end;
810
964
}
811
965
812
/* Create the service browser */
813
sb = avahi_s_service_browser_new(server, if_index,
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
814
968
AVAHI_PROTO_INET6,
815
969
"_mandos._tcp", NULL, 0,
816
browse_callback, server);
817
if (!sb) {
970
browse_callback, &mc);
971
if (sb == NULL) {
818
972
fprintf(stderr, "Failed to create service browser: %s\n",
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
821
goto exit;
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
822
976
}
823
977
824
978
/* Run the main loop */
825
979
826
980
if (debug){
827
fprintf(stderr, "Starting avahi loop search\n");
981
fprintf(stderr, "Starting Avahi loop search\n");
828
982
}
829
983
830
avahi_simple_poll_loop(simple_poll);
984
avahi_simple_poll_loop(mc.simple_poll);
831
985
832
exit:
986
end:
833
987
834
988
if (debug){
835
989
fprintf(stderr, "%s exiting\n", argv[0]);
836
990
}
837
991
838
992
/* Cleanup things */
839
if (sb)
993
if (sb != NULL)
840
994
avahi_s_service_browser_free(sb);
841
995
842
if (server)
843
avahi_server_free(server);
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
844
998
845
if (simple_poll)
846
avahi_simple_poll_free(simple_poll);
847
free(certfile);
848
free(certkey);
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
849
1003
850
return returncode;
1004
return exitcode;
851
1005
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0