To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-request.c
- browse files at revision 49
- compare with another revision
- download diff
- download tarball
- view history from revision 49
- Committer: Teddy Hogeborn
- Date: 2008-08-08 01:17:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20080808011717-h1vzp4vs7oyzkgx3
* mandos (IPv6_TCPServer.server_bind): Bug fix: allow port to be empty
as well as None.
(main): Bug fix: Let debug option default to 'None' to allow
override from config file.
as well as None.
(main): Bug fix: Let debug option default to 'None' to allow
override from config file.
- files added:
- network-protocol.txt
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- server.conf => mandos.conf
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
35
37
#include <stdio.h>
36
38
#include <assert.h>
37
39
#include <stdlib.h>
38
40
#include <time.h>
39
41
#include <net/if.h> /* if_nametoindex */
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));
322
gnutls_global_deinit ();
280
323
return -1;
281
324
}
282
325
283
326
if(debug){
284
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", certfile,
286
certkey);
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
329
seckeyfile);
287
330
}
288
331
289
332
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, certfile, certkey, 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, certfile, certkey);
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",
377
444
378
445
if(debug){
379
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
447
perror("if_indextoname");
383
448
return -1;
384
449
}
385
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
/* 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
/* } */
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
475
perror("inet_ntop");
476
} else {
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
479
}
480
}
414
481
}
415
482
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
483
ret = connect(tcp_sd, &to.in, sizeof(to));
417
484
if (ret < 0){
418
485
perror("connect");
419
486
return -1;
420
487
}
421
422
ret = initgnutls (&es);
423
if (ret != 0){
424
retval = -1;
425
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
}
426
511
}
427
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
430
512
431
513
if(debug){
432
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
515
}
434
516
435
ret = gnutls_handshake (es.session);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
518
519
ret = gnutls_handshake (session);
436
520
437
521
if (ret != GNUTLS_E_SUCCESS){
438
522
if(debug){
439
fprintf(stderr, "\n*** Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
440
524
gnutls_perror (ret);
441
525
}
442
526
retval = -1;
443
goto exit;
527
goto mandos_end;
444
528
}
445
529
446
//Retrieve OpenPGP packet that contains the wanted password
530
/* Read OpenPGP packet that contains the wanted password */
447
531
448
532
if(debug){
449
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
451
535
}
452
536
453
537
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;
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;
461
544
}
462
545
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
546
ret = gnutls_record_recv(session, buffer+buffer_length,
547
BUFFER_SIZE);
465
548
if (ret == 0){
466
549
break;
467
550
}
471
554
case GNUTLS_E_AGAIN:
472
555
break;
473
556
case GNUTLS_E_REHANDSHAKE:
474
ret = gnutls_handshake (es.session);
557
ret = gnutls_handshake (session);
475
558
if (ret < 0){
476
fprintf(stderr, "\n*** Handshake failed ***\n");
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
477
560
gnutls_perror (ret);
478
561
retval = -1;
479
goto exit;
562
goto mandos_end;
480
563
}
481
564
break;
482
565
default:
483
566
fprintf(stderr, "Unknown error while reading data from"
484
" encrypted session with mandos server\n");
567
" encrypted session with Mandos server\n");
485
568
retval = -1;
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
487
goto exit;
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
goto mandos_end;
488
571
}
489
572
} else {
490
573
buffer_length += (size_t) ret;
491
574
}
492
575
}
493
576
577
if(debug){
578
fprintf(stderr, "Closing TLS session\n");
579
}
580
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
582
494
583
if (buffer_length > 0){
495
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
496
585
buffer_length,
497
586
&decrypted_buffer,
498
certdir);
587
keydir);
499
588
if (decrypted_buffer_size >= 0){
589
written = 0;
500
590
while(written < (size_t) decrypted_buffer_size){
501
591
ret = (int)fwrite (decrypted_buffer + written, 1,
502
592
(size_t)decrypted_buffer_size - written,
516
606
retval = -1;
517
607
}
518
608
}
519
520
//shutdown procedure
521
522
if(debug){
523
fprintf(stderr, "Closing TLS session\n");
524
}
525
609
610
/* Shutdown procedure */
611
612
mandos_end:
526
613
free(buffer);
527
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
exit:
529
614
close(tcp_sd);
530
gnutls_deinit (es.session);
531
gnutls_certificate_free_credentials (es.cred);
532
gnutls_global_deinit ();
615
gnutls_deinit (session);
533
616
return retval;
534
617
}
535
618
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
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;
554
634
assert(r); /* Spurious warning */
555
635
556
636
/* Called whenever a service has been resolved successfully or
559
639
switch (event) {
560
640
default:
561
641
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)));
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)));
565
645
break;
566
646
567
647
case AVAHI_RESOLVER_FOUND:
569
649
char ip[AVAHI_ADDRESS_STR_MAX];
570
650
avahi_address_snprint(ip, sizeof(ip), address);
571
651
if(debug){
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" 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);
574
654
}
575
int ret = start_mandos_communication(ip, port, interface);
655
int ret = start_mandos_communication(ip, port, interface, mc);
576
656
if (ret == 0){
577
657
exit(EXIT_SUCCESS);
578
658
}
581
661
avahi_s_service_resolver_free(r);
582
662
}
583
663
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;
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");
630
710
}
711
break;
712
}
631
713
}
632
714
633
715
/* Combines file name and path and returns the malloced new
640
722
return NULL;
641
723
}
642
724
if(f_len > 0){
643
memcpy(tmp, first, f_len);
725
memcpy(tmp, first, f_len); /* Spurious warning */
644
726
}
645
727
tmp[f_len] = '/';
646
728
if(s_len > 0){
647
memcpy(tmp + f_len + 1, second, s_len);
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
648
730
}
649
731
tmp[f_len + 1 + s_len] = '\0';
650
732
return tmp;
651
733
}
652
734
653
735
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
736
int main(int argc, char *argv[]){
656
737
AvahiSServiceBrowser *sb = NULL;
657
738
int error;
658
739
int ret;
659
int returncode = EXIT_SUCCESS;
740
int exitcode = EXIT_SUCCESS;
660
741
const char *interface = "eth0";
661
742
struct ifreq network;
662
743
int sd;
744
uid_t uid;
745
gid_t gid;
663
746
char *connect_to = NULL;
664
747
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;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
753
754
{
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
759
.arg = "IP",
760
.doc = "Connect directly to a sepcified mandos server",
761
.group = 1 },
762
{ .name = "interface", .key = 'i',
763
.arg = "INTERFACE",
764
.doc = "Interface that Avahi will conntect through",
765
.group = 1 },
766
{ .name = "keydir", .key = 'd',
767
.arg = "KEYDIR",
768
.doc = "Directory where the openpgp keyring is",
769
.group = 1 },
770
{ .name = "seckey", .key = 's',
771
.arg = "SECKEY",
772
.doc = "Secret openpgp key for gnutls authentication",
773
.group = 1 },
774
{ .name = "pubkey", .key = 'p',
775
.arg = "PUBKEY",
776
.doc = "Public openpgp key for gnutls authentication",
777
.group = 2 },
778
{ .name = "dh-bits", .key = 129,
779
.arg = "BITS",
780
.doc = "dh-bits to use in gnutls communication",
781
.group = 2 },
782
{ .name = "priority", .key = 130,
783
.arg = "PRIORITY",
784
.doc = "GNUTLS priority", .group = 1 },
785
{ .name = NULL }
786
};
787
788
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
793
switch (key) {
794
case 128:
795
debug = true;
796
break;
797
case 'c':
798
connect_to = arg;
799
break;
800
case 'i':
801
interface = arg;
802
break;
803
case 'd':
804
keydir = arg;
805
break;
806
case 's':
807
seckeyfile = arg;
808
break;
809
case 'p':
810
pubkeyfile = arg;
811
break;
812
case 129:
813
errno = 0;
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
815
if (errno){
816
perror("strtol");
817
exit(EXIT_FAILURE);
818
}
819
break;
820
case 130:
821
mc.priority = arg;
822
break;
823
case ARGP_KEY_ARG:
824
argp_usage (state);
825
break;
826
case ARGP_KEY_END:
827
break;
828
default:
829
return ARGP_ERR_UNKNOWN;
830
}
831
return 0;
832
}
833
834
struct argp argp = { .options = options, .parser = parse_opt,
835
.args_doc = "",
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
839
}
840
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
851
goto end;
852
}
853
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
855
if (ret == -1){
856
fprintf(stderr, "init_gnutls_global\n");
857
goto end;
858
} else {
859
gnutls_initalized = true;
860
}
861
862
uid = getuid();
863
gid = getgid();
864
865
ret = setuid(uid);
866
if (ret == -1){
867
perror("setuid");
868
}
869
870
setgid(gid);
871
if (ret == -1){
872
perror("setgid");
719
873
}
720
874
721
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
730
884
char *address = strrchr(connect_to, ':');
731
885
if(address == NULL){
732
886
fprintf(stderr, "No colon in address\n");
733
exit(EXIT_FAILURE);
887
exitcode = EXIT_FAILURE;
888
goto end;
734
889
}
735
890
errno = 0;
736
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
737
892
if(errno){
738
893
perror("Bad port number");
739
exit(EXIT_FAILURE);
894
exitcode = EXIT_FAILURE;
895
goto end;
740
896
}
741
897
*address = '\0';
742
898
address = connect_to;
743
ret = start_mandos_communication(address, port, if_index);
899
ret = start_mandos_communication(address, port, if_index, &mc);
744
900
if(ret < 0){
745
exit(EXIT_FAILURE);
901
exitcode = EXIT_FAILURE;
746
902
} else {
747
exit(EXIT_SUCCESS);
903
exitcode = EXIT_SUCCESS;
748
904
}
905
goto end;
749
906
}
750
907
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);
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);
768
918
if(ret == -1){
769
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
771
goto exit;
772
}
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);
773
933
}
774
close(sd);
775
934
776
935
if (not debug){
777
936
avahi_set_log_function(empty_log);
778
937
}
779
938
780
/* Initialize the psuedo-RNG */
939
/* Initialize the pseudo-RNG for Avahi */
781
940
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",
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",
807
972
avahi_strerror(error));
808
returncode = EXIT_FAILURE;
809
goto exit;
973
exitcode = EXIT_FAILURE;
974
goto end;
810
975
}
811
976
812
/* Create the service browser */
813
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,
814
979
AVAHI_PROTO_INET6,
815
980
"_mandos._tcp", NULL, 0,
816
browse_callback, server);
817
if (!sb) {
981
browse_callback, &mc);
982
if (sb == NULL) {
818
983
fprintf(stderr, "Failed to create service browser: %s\n",
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
821
goto exit;
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
986
goto end;
822
987
}
823
988
824
989
/* Run the main loop */
825
990
826
991
if (debug){
827
fprintf(stderr, "Starting avahi loop search\n");
992
fprintf(stderr, "Starting Avahi loop search\n");
828
993
}
829
994
830
avahi_simple_poll_loop(simple_poll);
995
avahi_simple_poll_loop(mc.simple_poll);
831
996
832
exit:
997
end:
833
998
834
999
if (debug){
835
1000
fprintf(stderr, "%s exiting\n", argv[0]);
836
1001
}
837
1002
838
1003
/* Cleanup things */
839
if (sb)
1004
if (sb != NULL)
840
1005
avahi_s_service_browser_free(sb);
841
1006
842
if (server)
843
avahi_server_free(server);
844
845
if (simple_poll)
846
avahi_simple_poll_free(simple_poll);
847
free(certfile);
848
free(certkey);
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1009
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1012
free(pubkeyfile);
1013
free(seckeyfile);
1014
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
1018
}
849
1019
850
return returncode;
1020
return exitcode;
851
1021
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0