To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandosclient.c
- browse files at revision 37
- compare with another revision
- download diff
- download tarball
- view history from revision 37
- Committer: Teddy Hogeborn
- Date: 2008-08-02 21:06:12 UTC
- Revision ID: teddy@fukt.bsnet.se-20080802210612-4c1waup4z0f66ya7
Non-tested commit for merge purposes.
* plugbasedclient.c (getplugin, addargument, set_cloexec): Made static.
* plugins.d/passprompt.c (termination_handler): Made static.
* plugbasedclient.c (getplugin, addargument, set_cloexec): Made static.
* plugins.d/passprompt.c (termination_handler): Made static.
- files added:
- ca.pem
- files removed:
- mandos-client.xml
- files renamed:
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
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
37
35
#include <stdio.h>
38
36
#include <assert.h>
39
37
#include <stdlib.h>
40
38
#include <time.h>
41
39
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
40
47
41
#include <avahi-core/core.h>
48
42
#include <avahi-core/lookup.h>
51
45
#include <avahi-common/malloc.h>
52
46
#include <avahi-common/error.h>
53
47
54
/* Mandos client part */
48
//mandos client part
55
49
#include <sys/types.h> /* socket(), inet_pton() */
56
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
51
struct in6_addr, inet_pton() */
64
58
#include <string.h> /* memset */
65
59
#include <arpa/inet.h> /* inet_pton() */
66
60
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
61
62
// gpgme
72
63
#include <errno.h> /* perror() */
73
64
#include <gpgme.h>
74
65
66
// getopt_long
67
#include <getopt.h>
68
75
69
#define BUFFER_SIZE 256
76
70
71
static int dh_bits = 1024;
72
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
76
77
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>";
82
78
83
/* Used for passing in values through the Avahi callback functions */
79
/* Used for */
84
80
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
81
gnutls_session_t session;
87
82
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
83
gnutls_dh_params_t dh_params;
90
const char *priority;
91
} mandos_context;
92
93
/*
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
96
* "buffer_length" is how much is already used.
97
*/
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
102
if (buffer == NULL){
103
return 0;
104
}
105
buffer_capacity += BUFFER_SIZE;
106
}
107
return buffer_capacity;
108
}
109
110
/*
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
113
*/
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
size_t crypto_size,
116
char **plaintext,
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
117
89
const char *homedir){
118
90
gpgme_data_t dh_crypto, dh_plain;
119
91
gpgme_ctx_t ctx;
120
92
gpgme_error_t rc;
121
93
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
124
96
gpgme_engine_info_t engine_info;
125
97
126
98
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
100
}
129
101
130
102
/* Init GPGME */
136
108
return -1;
137
109
}
138
110
139
/* Set GPGME home directory for the OpenPGP engine only */
111
/* Set GPGME home directory */
140
112
rc = gpgme_get_engine_info (&engine_info);
141
113
if (rc != GPG_ERR_NO_ERROR){
142
114
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
124
engine_info = engine_info->next;
153
125
}
154
126
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
128
return -1;
157
129
}
158
130
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
133
if (rc != GPG_ERR_NO_ERROR){
163
134
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
135
gpgme_strsource(rc), gpgme_strerror(rc));
170
141
if (rc != GPG_ERR_NO_ERROR){
171
142
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
143
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
144
return -1;
175
145
}
176
146
179
149
if (rc != GPG_ERR_NO_ERROR){
180
150
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
151
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
152
return -1;
184
153
}
185
154
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
188
157
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
158
if (rc != GPG_ERR_NO_ERROR){
190
159
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
160
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
161
return -1;
194
162
}
195
163
196
164
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
166
}
199
167
200
168
if (debug){
201
169
gpgme_decrypt_result_t result;
202
170
result = gpgme_op_decrypt_result(ctx);
226
194
}
227
195
}
228
196
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
199
229
200
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
202
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
203
}
235
204
236
*plaintext = NULL;
205
*new_packet = 0;
237
206
while(true){
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
240
plaintext_capacity);
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
244
goto decrypt_end;
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;
245
216
}
246
217
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
219
BUFFER_SIZE);
249
220
/* Print the data, if any */
250
221
if (ret == 0){
251
/* EOF */
252
222
break;
253
223
}
254
224
if(ret < 0){
255
225
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
226
return -1;
258
227
}
259
plaintext_length += ret;
228
new_packet_length += ret;
260
229
}
261
230
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);
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
/* } */
274
238
275
239
/* Delete the GPGME plaintext data buffer */
276
240
gpgme_data_release(dh_plain);
277
return plaintext_length;
241
return new_packet_length;
278
242
}
279
243
280
244
static const char * safer_gnutls_strerror (int value) {
284
248
return ret;
285
249
}
286
250
287
/* GnuTLS log function callback */
288
251
static void debuggnutls(__attribute__((unused)) int level,
289
252
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
253
fprintf(stderr, "%s", string);
291
254
}
292
255
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
256
static int initgnutls(encrypted_session *es){
257
const char *err;
296
258
int ret;
297
259
298
260
if(debug){
301
263
302
264
if ((ret = gnutls_global_init ())
303
265
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
267
return -1;
307
268
}
308
269
309
270
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
271
gnutls_global_set_log_level(11);
314
272
gnutls_global_set_log_function(debuggnutls);
315
273
}
316
274
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
277
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
278
fprintf (stderr, "memory error: %s\n",
321
279
safer_gnutls_strerror(ret));
322
gnutls_global_deinit ();
323
280
return -1;
324
281
}
325
282
330
287
}
331
288
332
289
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
290
(es->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
334
291
if (ret != GNUTLS_E_SUCCESS) {
335
fprintf(stderr,
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
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",
339
297
safer_gnutls_strerror(ret));
340
goto globalfail;
341
}
342
343
/* GnuTLS server initialization */
344
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
348
goto globalfail;
349
}
350
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
354
goto globalfail;
355
}
356
357
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
358
359
return 0;
360
361
globalfail:
362
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
365
return -1;
366
367
}
368
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
371
int ret;
372
/* GnuTLS session creation */
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
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){
375
321
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
322
safer_gnutls_strerror(ret));
377
323
}
378
324
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
}
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;
389
331
}
390
332
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",
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",
395
337
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
397
338
return -1;
398
339
}
399
340
400
341
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
342
gnutls_certificate_server_set_request (es->session,
402
343
GNUTLS_CERT_IGNORE);
403
344
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
345
gnutls_dh_set_prime_bits (es->session, dh_bits);
405
346
406
347
return 0;
407
348
}
408
349
409
/* Avahi log function callback */
410
350
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
351
__attribute__((unused)) const char *txt){}
412
352
413
/* Called when a Mandos server is found */
414
353
static int start_mandos_communication(const char *ip, uint16_t port,
415
AvahiIfIndex if_index,
416
mandos_context *mc){
354
AvahiIfIndex if_index){
417
355
int ret, tcp_sd;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
356
struct sockaddr_in6 to;
357
encrypted_session es;
419
358
char *buffer = NULL;
420
359
char *decrypted_buffer;
421
360
size_t buffer_length = 0;
422
361
size_t buffer_capacity = 0;
423
362
ssize_t decrypted_buffer_size;
424
size_t written;
363
size_t written = 0;
425
364
int retval = 0;
426
365
char interface[IF_NAMESIZE];
427
gnutls_session_t session;
428
429
ret = init_gnutls_session (mc, &session);
430
if (ret != 0){
431
return -1;
432
}
433
366
434
367
if(debug){
435
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
441
374
perror("socket");
442
375
return -1;
443
376
}
444
445
if(debug){
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
378
if(if_indextoname((unsigned int)if_index, interface) == NULL){
379
if(debug){
447
380
perror("if_indextoname");
448
return -1;
449
381
}
382
return -1;
383
}
384
385
if(debug){
450
386
fprintf(stderr, "Binding to interface %s\n", interface);
451
387
}
452
388
453
389
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
458
392
if (ret < 0 ){
459
393
perror("inet_pton");
460
394
return -1;
461
}
395
}
462
396
if(ret == 0){
463
397
fprintf(stderr, "Bad address: %s\n", ip);
464
398
return -1;
465
399
}
466
to.in6.sin6_port = htons(port); /* Spurious warning */
400
to.sin6_port = htons(port); /* Spurious warning */
467
401
468
to.in6.sin6_scope_id = (uint32_t)if_index;
402
to.sin6_scope_id = (uint32_t)if_index;
469
403
470
404
if(debug){
471
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
406
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
407
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
474
408
sizeof(addrstr)) == NULL){
475
409
perror("inet_ntop");
476
410
} else {
477
411
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
412
fprintf(stderr, "Canonical address form: %s\n",
413
addrstr, ntohs(to.sin6_port));
479
414
}
480
415
}
481
416
}
482
417
483
ret = connect(tcp_sd, &to.in, sizeof(to));
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
484
419
if (ret < 0){
485
420
perror("connect");
486
421
return -1;
487
422
}
488
489
const char *out = mandos_protocol_version;
490
written = 0;
491
while (true){
492
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
495
if (ret == -1){
496
perror("write");
497
retval = -1;
498
goto mandos_end;
499
}
500
written += (size_t)ret;
501
if(written < out_size){
502
continue;
503
} else {
504
if (out == mandos_protocol_version){
505
written = 0;
506
out = "\r\n";
507
} else {
508
break;
509
}
510
}
423
424
ret = initgnutls (&es);
425
if (ret != 0){
426
retval = -1;
427
return -1;
511
428
}
512
429
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
432
513
433
if(debug){
514
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
515
435
}
516
436
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
437
ret = gnutls_handshake (es.session);
520
438
521
439
if (ret != GNUTLS_E_SUCCESS){
522
440
if(debug){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
441
fprintf(stderr, "\n*** Handshake failed ***\n");
524
442
gnutls_perror (ret);
525
443
}
526
444
retval = -1;
527
goto mandos_end;
445
goto exit;
528
446
}
529
447
530
/* Read OpenPGP packet that contains the wanted password */
448
//Retrieve OpenPGP packet that contains the wanted password
531
449
532
450
if(debug){
533
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
535
453
}
536
454
537
455
while(true){
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
539
buffer_capacity);
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
542
retval = -1;
543
goto mandos_end;
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;
544
463
}
545
464
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
548
467
if (ret == 0){
549
468
break;
550
469
}
554
473
case GNUTLS_E_AGAIN:
555
474
break;
556
475
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
476
ret = gnutls_handshake (es.session);
558
477
if (ret < 0){
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
478
fprintf(stderr, "\n*** Handshake failed ***\n");
560
479
gnutls_perror (ret);
561
480
retval = -1;
562
goto mandos_end;
481
goto exit;
563
482
}
564
483
break;
565
484
default:
566
485
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
486
" encrypted session with mandos server\n");
568
487
retval = -1;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
489
goto exit;
571
490
}
572
491
} else {
573
492
buffer_length += (size_t) ret;
574
493
}
575
494
}
576
495
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
583
496
if (buffer_length > 0){
584
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
585
498
buffer_length,
586
499
&decrypted_buffer,
587
500
keydir);
588
501
if (decrypted_buffer_size >= 0){
589
written = 0;
590
502
while(written < (size_t) decrypted_buffer_size){
591
503
ret = (int)fwrite (decrypted_buffer + written, 1,
592
504
(size_t)decrypted_buffer_size - written,
606
518
retval = -1;
607
519
}
608
520
}
609
610
/* Shutdown procedure */
611
612
mandos_end:
521
522
//shutdown procedure
523
524
if(debug){
525
fprintf(stderr, "Closing TLS session\n");
526
}
527
613
528
free(buffer);
529
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
530
exit:
614
531
close(tcp_sd);
615
gnutls_deinit (session);
532
gnutls_deinit (es.session);
533
gnutls_certificate_free_credentials (es.cred);
534
gnutls_global_deinit ();
616
535
return retval;
617
536
}
618
537
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;
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
634
556
assert(r); /* Spurious warning */
635
557
636
558
/* Called whenever a service has been resolved successfully or
639
561
switch (event) {
640
562
default:
641
563
case AVAHI_RESOLVER_FAILURE:
642
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
643
" of type '%s' in domain '%s': %s\n", name, type, domain,
644
avahi_strerror(avahi_server_errno(mc->server)));
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)));
645
567
break;
646
568
647
569
case AVAHI_RESOLVER_FOUND:
649
571
char ip[AVAHI_ADDRESS_STR_MAX];
650
572
avahi_address_snprint(ip, sizeof(ip), address);
651
573
if(debug){
652
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
653
" port %d\n", name, host_name, ip, interface, port);
574
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
575
" port %d\n", name, host_name, ip, port);
654
576
}
655
int ret = start_mandos_communication(ip, port, interface, mc);
577
int ret = start_mandos_communication(ip, port, interface);
656
578
if (ret == 0){
657
579
exit(EXIT_SUCCESS);
658
580
}
661
583
avahi_s_service_resolver_free(r);
662
584
}
663
585
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");
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;
710
632
}
711
break;
712
}
713
633
}
714
634
715
635
/* Combines file name and path and returns the malloced new
722
642
return NULL;
723
643
}
724
644
if(f_len > 0){
725
memcpy(tmp, first, f_len); /* Spurious warning */
645
memcpy(tmp, first, f_len);
726
646
}
727
647
tmp[f_len] = '/';
728
648
if(s_len > 0){
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
649
memcpy(tmp + f_len + 1, second, s_len);
730
650
}
731
651
tmp[f_len + 1 + s_len] = '\0';
732
652
return tmp;
733
653
}
734
654
735
655
736
int main(int argc, char *argv[]){
656
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
657
AvahiServerConfig config;
737
658
AvahiSServiceBrowser *sb = NULL;
738
659
int error;
739
660
int ret;
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;
661
int debug_int = 0;
662
int returncode = EXIT_SUCCESS;
663
const char *interface = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
746
665
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
666
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);
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
}
839
713
}
840
714
debug = debug_int ? true : false;
715
841
716
pubkeyfile = combinepath(keydir, pubkeyfile);
842
717
if (pubkeyfile == NULL){
843
718
perror("combinepath");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
873
}
874
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
876
if(if_index == 0){
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
878
exit(EXIT_FAILURE);
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
}
879
728
}
880
729
881
730
if(connect_to != NULL){
884
733
char *address = strrchr(connect_to, ':');
885
734
if(address == NULL){
886
735
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
736
exit(EXIT_FAILURE);
889
737
}
890
738
errno = 0;
891
739
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
892
740
if(errno){
893
741
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
895
goto end;
742
exit(EXIT_FAILURE);
896
743
}
897
744
*address = '\0';
898
745
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
746
ret = start_mandos_communication(address, port, if_index);
900
747
if(ret < 0){
901
exitcode = EXIT_FAILURE;
748
exit(EXIT_FAILURE);
902
749
} else {
903
exitcode = EXIT_SUCCESS;
750
exit(EXIT_SUCCESS);
904
751
}
905
goto end;
906
752
}
907
753
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);
754
seckeyfile = combinepath(keydir, seckeyfile);
755
if (seckeyfile == NULL){
756
perror("combinepath");
757
goto exit;
933
758
}
934
759
935
760
if (not debug){
936
761
avahi_set_log_function(empty_log);
937
762
}
938
763
939
/* Initialize the pseudo-RNG for Avahi */
764
/* Initialize the psuedo-RNG */
940
765
srand((unsigned int) time(NULL));
941
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
946
" object.\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
{
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
959
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
963
NULL, &error);
964
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
967
}
968
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
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",
972
791
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
974
goto end;
792
returncode = EXIT_FAILURE;
793
goto exit;
975
794
}
976
795
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
796
/* Create the service browser */
797
sb = avahi_s_service_browser_new(server, if_index,
979
798
AVAHI_PROTO_INET6,
980
799
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
982
if (sb == NULL) {
800
browse_callback, server);
801
if (!sb) {
983
802
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
803
avahi_strerror(avahi_server_errno(server)));
804
returncode = EXIT_FAILURE;
805
goto exit;
987
806
}
988
807
989
808
/* Run the main loop */
990
809
991
810
if (debug){
992
fprintf(stderr, "Starting Avahi loop search\n");
811
fprintf(stderr, "Starting avahi loop search\n");
993
812
}
994
813
995
avahi_simple_poll_loop(mc.simple_poll);
814
avahi_simple_poll_loop(simple_poll);
996
815
997
end:
816
exit:
998
817
999
818
if (debug){
1000
819
fprintf(stderr, "%s exiting\n", argv[0]);
1001
820
}
1002
821
1003
822
/* Cleanup things */
1004
if (sb != NULL)
823
if (sb)
1005
824
avahi_s_service_browser_free(sb);
1006
825
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
826
if (server)
827
avahi_server_free(server);
1009
828
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
829
if (simple_poll)
830
avahi_simple_poll_free(simple_poll);
1012
831
free(pubkeyfile);
1013
832
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
1019
833
1020
return exitcode;
834
return returncode;
1021
835
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0