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- Committer: Teddy Hogeborn
- Date: 2008-08-09 01:39:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20080809013909-n3i3ll1voycmmw7l
* clients.conf: Better comments.
(foo): Commented out and changed into a better example client.
(braxen_client): Removed.
(bar): New commented-out example client.
* mandos: Changed all log messages to be unicode strings.
(Client.fqdn): Renamed to "host". All users and documentation
changed.
(main): Exit immediately if no clients are defined.
* mandos.conf: Better comments.
(foo): Commented out and changed into a better example client.
(braxen_client): Removed.
(bar): New commented-out example client.
* mandos: Changed all log messages to be unicode strings.
(Client.fqdn): Renamed to "host". All users and documentation
changed.
(main): Exit immediately if no clients are defined.
* mandos.conf: Better comments.
- files added:
- mandos-client.xml
- 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
76
71
static int dh_bits = 1024;
72
77
bool debug = false;
73
78
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
76
77
bool debug = false;
78
79
/* Used for */
79
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
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));
322
gnutls_global_deinit ();
280
323
return -1;
281
324
}
282
325
287
330
}
288
331
289
332
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
291
334
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, pubkeyfile, seckeyfile);
296
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",
297
339
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
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){
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){
321
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
376
safer_gnutls_strerror(ret));
323
377
}
324
378
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;
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
}
331
389
}
332
390
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",
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",
337
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
338
397
return -1;
339
398
}
340
399
341
400
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
401
gnutls_certificate_server_set_request (*session,
343
402
GNUTLS_CERT_IGNORE);
344
403
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
346
405
347
406
return 0;
348
407
}
349
408
409
/* Avahi log function callback */
350
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
411
__attribute__((unused)) const char *txt){}
352
412
413
/* Called when a Mandos server is found */
353
414
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
415
AvahiIfIndex if_index,
416
mandos_context *mc){
355
417
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
358
419
char *buffer = NULL;
359
420
char *decrypted_buffer;
360
421
size_t buffer_length = 0;
361
422
size_t buffer_capacity = 0;
362
423
ssize_t decrypted_buffer_size;
363
size_t written = 0;
424
size_t written;
364
425
int retval = 0;
365
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
}
366
433
367
434
if(debug){
368
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
374
441
perror("socket");
375
442
return -1;
376
443
}
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
447
perror("if_indextoname");
448
return -1;
381
449
}
382
return -1;
383
}
384
385
if(debug){
386
450
fprintf(stderr, "Binding to interface %s\n", interface);
387
451
}
388
452
389
453
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
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);
392
458
if (ret < 0 ){
393
459
perror("inet_pton");
394
460
return -1;
395
}
461
}
396
462
if(ret == 0){
397
463
fprintf(stderr, "Bad address: %s\n", ip);
398
464
return -1;
399
465
}
400
to.sin6_port = htons(port); /* Spurious warning */
466
to.in6.sin6_port = htons(port); /* Spurious warning */
401
467
402
to.sin6_scope_id = (uint32_t)if_index;
468
to.in6.sin6_scope_id = (uint32_t)if_index;
403
469
404
470
if(debug){
405
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
472
char addrstr[INET6_ADDRSTRLEN] = "";
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
408
474
sizeof(addrstr)) == NULL){
409
475
perror("inet_ntop");
410
476
} else {
411
477
if(strcmp(addrstr, ip) != 0){
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
414
479
}
415
480
}
416
481
}
417
482
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
419
484
if (ret < 0){
420
485
perror("connect");
421
486
return -1;
422
487
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
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
}
428
511
}
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
432
512
433
513
if(debug){
434
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
435
515
}
436
516
437
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
438
520
439
521
if (ret != GNUTLS_E_SUCCESS){
440
522
if(debug){
441
fprintf(stderr, "\n*** Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
442
524
gnutls_perror (ret);
443
525
}
444
526
retval = -1;
445
goto exit;
527
goto mandos_end;
446
528
}
447
529
448
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
449
531
450
532
if(debug){
451
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
453
535
}
454
536
455
537
while(true){
456
if (buffer_length + BUFFER_SIZE > buffer_capacity){
457
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
if (buffer == NULL){
459
perror("realloc");
460
goto exit;
461
}
462
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;
463
544
}
464
545
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
467
548
if (ret == 0){
468
549
break;
469
550
}
473
554
case GNUTLS_E_AGAIN:
474
555
break;
475
556
case GNUTLS_E_REHANDSHAKE:
476
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
477
558
if (ret < 0){
478
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
479
560
gnutls_perror (ret);
480
561
retval = -1;
481
goto exit;
562
goto mandos_end;
482
563
}
483
564
break;
484
565
default:
485
566
fprintf(stderr, "Unknown error while reading data from"
486
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
487
568
retval = -1;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
490
571
}
491
572
} else {
492
573
buffer_length += (size_t) ret;
493
574
}
494
575
}
495
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
496
583
if (buffer_length > 0){
497
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
498
585
buffer_length,
499
586
&decrypted_buffer,
500
587
keydir);
501
588
if (decrypted_buffer_size >= 0){
589
written = 0;
502
590
while(written < (size_t) decrypted_buffer_size){
503
591
ret = (int)fwrite (decrypted_buffer + written, 1,
504
592
(size_t)decrypted_buffer_size - written,
518
606
retval = -1;
519
607
}
520
608
}
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
609
610
/* Shutdown procedure */
611
612
mandos_end:
528
613
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
531
614
close(tcp_sd);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
615
gnutls_deinit (session);
535
616
return retval;
536
617
}
537
618
538
static AvahiSimplePoll *simple_poll = NULL;
539
static AvahiServer *server = NULL;
540
541
static void resolve_callback(
542
AvahiSServiceResolver *r,
543
AvahiIfIndex interface,
544
AVAHI_GCC_UNUSED AvahiProtocol protocol,
545
AvahiResolverEvent event,
546
const char *name,
547
const char *type,
548
const char *domain,
549
const char *host_name,
550
const AvahiAddress *address,
551
uint16_t port,
552
AVAHI_GCC_UNUSED AvahiStringList *txt,
553
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
554
AVAHI_GCC_UNUSED void* userdata) {
555
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;
556
634
assert(r); /* Spurious warning */
557
635
558
636
/* Called whenever a service has been resolved successfully or
561
639
switch (event) {
562
640
default:
563
641
case AVAHI_RESOLVER_FAILURE:
564
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
565
" type '%s' in domain '%s': %s\n", name, type, domain,
566
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)));
567
645
break;
568
646
569
647
case AVAHI_RESOLVER_FOUND:
571
649
char ip[AVAHI_ADDRESS_STR_MAX];
572
650
avahi_address_snprint(ip, sizeof(ip), address);
573
651
if(debug){
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" 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);
576
654
}
577
int ret = start_mandos_communication(ip, port, interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
578
656
if (ret == 0){
579
657
exit(EXIT_SUCCESS);
580
658
}
583
661
avahi_s_service_resolver_free(r);
584
662
}
585
663
586
static void browse_callback(
587
AvahiSServiceBrowser *b,
588
AvahiIfIndex interface,
589
AvahiProtocol protocol,
590
AvahiBrowserEvent event,
591
const char *name,
592
const char *type,
593
const char *domain,
594
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
595
void* userdata) {
596
597
AvahiServer *s = userdata;
598
assert(b); /* Spurious warning */
599
600
/* Called whenever a new services becomes available on the LAN or
601
is removed from the LAN */
602
603
switch (event) {
604
default:
605
case AVAHI_BROWSER_FAILURE:
606
607
fprintf(stderr, "(Browser) %s\n",
608
avahi_strerror(avahi_server_errno(server)));
609
avahi_simple_poll_quit(simple_poll);
610
return;
611
612
case AVAHI_BROWSER_NEW:
613
/* We ignore the returned resolver object. In the callback
614
function we free it. If the server is terminated before
615
the callback function is called the server will free
616
the resolver for us. */
617
618
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
619
type, domain,
620
AVAHI_PROTO_INET6, 0,
621
resolve_callback, s)))
622
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
623
avahi_strerror(avahi_server_errno(s)));
624
break;
625
626
case AVAHI_BROWSER_REMOVE:
627
break;
628
629
case AVAHI_BROWSER_ALL_FOR_NOW:
630
case AVAHI_BROWSER_CACHE_EXHAUSTED:
631
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");
632
710
}
711
break;
712
}
633
713
}
634
714
635
715
/* Combines file name and path and returns the malloced new
642
722
return NULL;
643
723
}
644
724
if(f_len > 0){
645
memcpy(tmp, first, f_len);
725
memcpy(tmp, first, f_len); /* Spurious warning */
646
726
}
647
727
tmp[f_len] = '/';
648
728
if(s_len > 0){
649
memcpy(tmp + f_len + 1, second, s_len);
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
650
730
}
651
731
tmp[f_len + 1 + s_len] = '\0';
652
732
return tmp;
653
733
}
654
734
655
735
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
657
AvahiServerConfig config;
736
int main(int argc, char *argv[]){
658
737
AvahiSServiceBrowser *sb = NULL;
659
738
int error;
660
739
int ret;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
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;
664
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
665
char *connect_to = NULL;
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;
666
753
667
debug_int = debug ? 1 : 0;
668
while (true){
669
static struct option long_options[] = {
670
{"debug", no_argument, &debug_int, 1},
671
{"connect", required_argument, NULL, 'C'},
672
{"interface", required_argument, NULL, 'i'},
673
{"keydir", required_argument, NULL, 'd'},
674
{"seckey", required_argument, NULL, 'c'},
675
{"pubkey", required_argument, NULL, 'k'},
676
{"dh-bits", required_argument, NULL, 'D'},
677
{0, 0, 0, 0} };
678
679
int option_index = 0;
680
ret = getopt_long (argc, argv, "i:", long_options,
681
&option_index);
682
683
if (ret == -1){
684
break;
685
}
686
687
switch(ret){
688
case 0:
689
break;
690
case 'i':
691
interface = optarg;
692
break;
693
case 'C':
694
connect_to = optarg;
695
break;
696
case 'd':
697
keydir = optarg;
698
break;
699
case 'c':
700
pubkeyfile = optarg;
701
break;
702
case 'k':
703
seckeyfile = optarg;
704
break;
705
case 'D':
706
dh_bits = atoi(optarg);
707
break;
708
case '?':
709
break
710
default:
711
exit(EXIT_FAILURE);
712
}
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);
713
839
}
714
debug = debug_int ? true : false;
715
840
716
841
pubkeyfile = combinepath(keydir, pubkeyfile);
717
842
if (pubkeyfile == NULL){
718
843
perror("combinepath");
719
goto exit;
720
}
721
722
if(interface != NULL){
723
if_index = (AvahiIfIndex) if_nametoindex(interface);
724
if(if_index == 0){
725
fprintf(stderr, "No such interface: \"%s\"\n", interface);
726
exit(EXIT_FAILURE);
727
}
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);
728
879
}
729
880
730
881
if(connect_to != NULL){
733
884
char *address = strrchr(connect_to, ':');
734
885
if(address == NULL){
735
886
fprintf(stderr, "No colon in address\n");
736
exit(EXIT_FAILURE);
887
exitcode = EXIT_FAILURE;
888
goto end;
737
889
}
738
890
errno = 0;
739
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
740
892
if(errno){
741
893
perror("Bad port number");
742
exit(EXIT_FAILURE);
894
exitcode = EXIT_FAILURE;
895
goto end;
743
896
}
744
897
*address = '\0';
745
898
address = connect_to;
746
ret = start_mandos_communication(address, port, if_index);
899
ret = start_mandos_communication(address, port, if_index, &mc);
747
900
if(ret < 0){
748
exit(EXIT_FAILURE);
901
exitcode = EXIT_FAILURE;
749
902
} else {
750
exit(EXIT_SUCCESS);
903
exitcode = EXIT_SUCCESS;
751
904
}
905
goto end;
752
906
}
753
907
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
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);
758
933
}
759
934
760
935
if (not debug){
761
936
avahi_set_log_function(empty_log);
762
937
}
763
938
764
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
765
940
srand((unsigned int) time(NULL));
766
767
/* Allocate main loop object */
768
if (!(simple_poll = avahi_simple_poll_new())) {
769
fprintf(stderr, "Failed to create simple poll object.\n");
770
771
goto exit;
772
}
773
774
/* Do not publish any local records */
775
avahi_server_config_init(&config);
776
config.publish_hinfo = 0;
777
config.publish_addresses = 0;
778
config.publish_workstation = 0;
779
config.publish_domain = 0;
780
781
/* Allocate a new server */
782
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
783
&config, NULL, NULL, &error);
784
785
/* Free the configuration data */
786
avahi_server_config_free(&config);
787
788
/* Check if creating the server object succeeded */
789
if (!server) {
790
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",
791
972
avahi_strerror(error));
792
returncode = EXIT_FAILURE;
793
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
794
975
}
795
976
796
/* Create the service browser */
797
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,
798
979
AVAHI_PROTO_INET6,
799
980
"_mandos._tcp", NULL, 0,
800
browse_callback, server);
801
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
802
983
fprintf(stderr, "Failed to create service browser: %s\n",
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
806
987
}
807
988
808
989
/* Run the main loop */
809
990
810
991
if (debug){
811
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
812
993
}
813
994
814
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
815
996
816
exit:
997
end:
817
998
818
999
if (debug){
819
1000
fprintf(stderr, "%s exiting\n", argv[0]);
820
1001
}
821
1002
822
1003
/* Cleanup things */
823
if (sb)
1004
if (sb != NULL)
824
1005
avahi_s_service_browser_free(sb);
825
1006
826
if (server)
827
avahi_server_free(server);
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
828
1009
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
831
1012
free(pubkeyfile);
832
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
833
1019
834
return returncode;
1020
return exitcode;
835
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0