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- Committer: Teddy Hogeborn
- Date: 2008-08-02 14:33:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20080802143347-u1m4zs1q0feu72ei
* TODO: Converted to org-mode style
* plugins.d/mandosclient.c (certdir): Changed to "/conf/conf.d/mandos/".
(certdir, certfile, certkey, pgp_packet_decrypt, debuggnutls,
initgnutls, empty_log, combinepath): Made static.
(combinepath): Rewritten to only get the argument string lengths
once. Do not print error message; leave that to
caller. All callers changed.
* plugins.d/mandosclient.c (certdir): Changed to "/conf/conf.d/mandos/".
(certdir, certfile, certkey, pgp_packet_decrypt, debuggnutls,
initgnutls, empty_log, combinepath): Made static.
(combinepath): Rewritten to only get the argument string lengths
once. Do not print error message; leave that to
caller. All callers changed.
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
70
#define DH_BITS 1024
71
72
static const char *certdir = "/conf/conf.d/mandos";
73
static const char *certfile = "openpgp-client.txt";
74
static const char *certkey = "openpgp-client-key.txt";
76
75
77
76
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
77
83
/* Used for passing in values through the Avahi callback functions */
84
78
typedef struct {
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
79
gnutls_session_t session;
87
80
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
89
81
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,
82
} encrypted_session;
83
84
85
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
char **new_packet,
117
87
const char *homedir){
118
88
gpgme_data_t dh_crypto, dh_plain;
119
89
gpgme_ctx_t ctx;
120
90
gpgme_error_t rc;
121
91
ssize_t ret;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
124
94
gpgme_engine_info_t engine_info;
125
95
126
96
if (debug){
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
128
98
}
129
99
130
100
/* Init GPGME */
136
106
return -1;
137
107
}
138
108
139
/* Set GPGME home directory for the OpenPGP engine only */
109
/* Set GPGME home directory */
140
110
rc = gpgme_get_engine_info (&engine_info);
141
111
if (rc != GPG_ERR_NO_ERROR){
142
112
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
152
122
engine_info = engine_info->next;
153
123
}
154
124
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
125
fprintf(stderr, "Could not set home dir to %s\n", homedir);
156
126
return -1;
157
127
}
158
128
159
/* Create new GPGME data buffer from memory cryptotext */
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
161
0);
129
/* Create new GPGME data buffer from packet buffer */
130
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
162
131
if (rc != GPG_ERR_NO_ERROR){
163
132
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
133
gpgme_strsource(rc), gpgme_strerror(rc));
170
139
if (rc != GPG_ERR_NO_ERROR){
171
140
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
141
gpgme_strsource(rc), gpgme_strerror(rc));
173
gpgme_data_release(dh_crypto);
174
142
return -1;
175
143
}
176
144
179
147
if (rc != GPG_ERR_NO_ERROR){
180
148
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
149
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
183
goto decrypt_end;
150
return -1;
184
151
}
185
152
186
/* Decrypt data from the cryptotext data buffer to the plaintext
187
data buffer */
153
/* Decrypt data from the FILE pointer to the plaintext data
154
buffer */
188
155
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
156
if (rc != GPG_ERR_NO_ERROR){
190
157
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
158
gpgme_strsource(rc), gpgme_strerror(rc));
192
plaintext_length = -1;
193
goto decrypt_end;
159
return -1;
194
160
}
195
161
196
162
if(debug){
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
163
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
198
164
}
199
165
200
166
if (debug){
201
167
gpgme_decrypt_result_t result;
202
168
result = gpgme_op_decrypt_result(ctx);
226
192
}
227
193
}
228
194
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
197
229
198
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
199
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
200
perror("pgpme_data_seek");
232
plaintext_length = -1;
233
goto decrypt_end;
234
201
}
235
202
236
*plaintext = NULL;
203
*new_packet = 0;
237
204
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;
205
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
206
*new_packet = realloc(*new_packet,
207
(unsigned int)new_packet_capacity
208
+ BUFFER_SIZE);
209
if (*new_packet == NULL){
210
perror("realloc");
211
return -1;
212
}
213
new_packet_capacity += BUFFER_SIZE;
245
214
}
246
215
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
248
217
BUFFER_SIZE);
249
218
/* Print the data, if any */
250
219
if (ret == 0){
251
/* EOF */
252
220
break;
253
221
}
254
222
if(ret < 0){
255
223
perror("gpgme_data_read");
256
plaintext_length = -1;
257
goto decrypt_end;
224
return -1;
258
225
}
259
plaintext_length += ret;
226
new_packet_length += ret;
260
227
}
261
228
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);
229
/* FIXME: check characters before printing to screen so to not print
230
terminal control characters */
231
/* if(debug){ */
232
/* fprintf(stderr, "decrypted password is: "); */
233
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
234
/* fprintf(stderr, "\n"); */
235
/* } */
274
236
275
237
/* Delete the GPGME plaintext data buffer */
276
238
gpgme_data_release(dh_plain);
277
return plaintext_length;
239
return new_packet_length;
278
240
}
279
241
280
242
static const char * safer_gnutls_strerror (int value) {
284
246
return ret;
285
247
}
286
248
287
/* GnuTLS log function callback */
288
249
static void debuggnutls(__attribute__((unused)) int level,
289
250
const char* string){
290
fprintf(stderr, "GnuTLS: %s", string);
251
fprintf(stderr, "%s", string);
291
252
}
292
253
293
static int init_gnutls_global(mandos_context *mc,
294
const char *pubkeyfile,
295
const char *seckeyfile){
254
static int initgnutls(encrypted_session *es){
255
const char *err;
296
256
int ret;
297
257
298
258
if(debug){
301
261
302
262
if ((ret = gnutls_global_init ())
303
263
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "GnuTLS global_init: %s\n",
305
safer_gnutls_strerror(ret));
264
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
306
265
return -1;
307
266
}
308
267
309
268
if (debug){
310
/* "Use a log level over 10 to enable all debugging options."
311
* - GnuTLS manual
312
*/
313
269
gnutls_global_set_log_level(11);
314
270
gnutls_global_set_log_function(debuggnutls);
315
271
}
316
272
317
/* OpenPGP credentials */
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
273
/* openpgp credentials */
274
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
319
275
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
276
fprintf (stderr, "memory error: %s\n",
321
277
safer_gnutls_strerror(ret));
322
278
return -1;
323
279
}
324
280
325
281
if(debug){
326
282
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
283
" and keyfile %s as GnuTLS credentials\n", certfile,
284
certkey);
329
285
}
330
286
331
287
ret = gnutls_certificate_set_openpgp_key_file
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
288
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
289
if (ret != GNUTLS_E_SUCCESS) {
334
fprintf(stderr,
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
290
fprintf
291
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
292
" '%s')\n",
293
ret, certfile, certkey);
294
fprintf(stdout, "The Error is: %s\n",
338
295
safer_gnutls_strerror(ret));
339
296
return -1;
340
297
}
341
298
342
/* GnuTLS server initialization */
343
ret = gnutls_dh_params_init(&mc->dh_params);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
347
return -1;
348
}
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
353
return -1;
354
}
355
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
357
358
return 0;
359
}
360
361
static int init_gnutls_session(mandos_context *mc,
362
gnutls_session_t *session){
363
int ret;
364
/* GnuTLS session creation */
365
ret = gnutls_init(session, GNUTLS_SERVER);
366
if (ret != GNUTLS_E_SUCCESS){
299
//GnuTLS server initialization
300
if ((ret = gnutls_dh_params_init (&es->dh_params))
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "Error in dh parameter initialization: %s\n",
303
safer_gnutls_strerror(ret));
304
return -1;
305
}
306
307
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
308
!= GNUTLS_E_SUCCESS) {
309
fprintf (stderr, "Error in prime generation: %s\n",
310
safer_gnutls_strerror(ret));
311
return -1;
312
}
313
314
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
315
316
// GnuTLS session creation
317
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
318
!= GNUTLS_E_SUCCESS){
367
319
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
368
320
safer_gnutls_strerror(ret));
369
321
}
370
322
371
{
372
const char *err;
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf(stderr, "Syntax error at: %s\n", err);
376
fprintf(stderr, "GnuTLS error: %s\n",
377
safer_gnutls_strerror(ret));
378
return -1;
379
}
323
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
324
!= GNUTLS_E_SUCCESS) {
325
fprintf(stderr, "Syntax error at: %s\n", err);
326
fprintf(stderr, "GnuTLS error: %s\n",
327
safer_gnutls_strerror(ret));
328
return -1;
380
329
}
381
330
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
383
mc->cred);
384
if (ret != GNUTLS_E_SUCCESS) {
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
331
if ((ret = gnutls_credentials_set
332
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
333
!= GNUTLS_E_SUCCESS) {
334
fprintf(stderr, "Error setting a credentials set: %s\n",
386
335
safer_gnutls_strerror(ret));
387
336
return -1;
388
337
}
389
338
390
339
/* ignore client certificate if any. */
391
gnutls_certificate_server_set_request (*session,
340
gnutls_certificate_server_set_request (es->session,
392
341
GNUTLS_CERT_IGNORE);
393
342
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
395
344
396
345
return 0;
397
346
}
398
347
399
/* Avahi log function callback */
400
348
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
401
349
__attribute__((unused)) const char *txt){}
402
350
403
/* Called when a Mandos server is found */
404
351
static int start_mandos_communication(const char *ip, uint16_t port,
405
AvahiIfIndex if_index,
406
mandos_context *mc){
352
AvahiIfIndex if_index){
407
353
int ret, tcp_sd;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
354
struct sockaddr_in6 to;
355
encrypted_session es;
409
356
char *buffer = NULL;
410
357
char *decrypted_buffer;
411
358
size_t buffer_length = 0;
412
359
size_t buffer_capacity = 0;
413
360
ssize_t decrypted_buffer_size;
414
size_t written;
361
size_t written = 0;
415
362
int retval = 0;
416
363
char interface[IF_NAMESIZE];
417
gnutls_session_t session;
418
419
ret = init_gnutls_session (mc, &session);
420
if (ret != 0){
421
return -1;
422
}
423
364
424
365
if(debug){
425
366
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
431
372
perror("socket");
432
373
return -1;
433
374
}
434
435
if(debug){
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
375
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
if(debug){
437
378
perror("if_indextoname");
438
return -1;
439
379
}
380
return -1;
381
}
382
383
if(debug){
440
384
fprintf(stderr, "Binding to interface %s\n", interface);
441
385
}
442
386
443
387
memset(&to,0,sizeof(to)); /* Spurious warning */
444
to.in6.sin6_family = AF_INET6;
445
/* It would be nice to have a way to detect if we were passed an
446
IPv4 address here. Now we assume an IPv6 address. */
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
388
to.sin6_family = AF_INET6;
389
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
448
390
if (ret < 0 ){
449
391
perror("inet_pton");
450
392
return -1;
451
}
393
}
452
394
if(ret == 0){
453
395
fprintf(stderr, "Bad address: %s\n", ip);
454
396
return -1;
455
397
}
456
to.in6.sin6_port = htons(port); /* Spurious warning */
398
to.sin6_port = htons(port); /* Spurious warning */
457
399
458
to.in6.sin6_scope_id = (uint32_t)if_index;
400
to.sin6_scope_id = (uint32_t)if_index;
459
401
460
402
if(debug){
461
403
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
462
char addrstr[INET6_ADDRSTRLEN] = "";
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
464
sizeof(addrstr)) == NULL){
465
perror("inet_ntop");
466
} else {
467
if(strcmp(addrstr, ip) != 0){
468
fprintf(stderr, "Canonical address form: %s\n", addrstr);
469
}
470
}
404
/* char addrstr[INET6_ADDRSTRLEN]; */
405
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
406
/* sizeof(addrstr)) == NULL){ */
407
/* perror("inet_ntop"); */
408
/* } else { */
409
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
410
/* addrstr, ntohs(to.sin6_port)); */
411
/* } */
471
412
}
472
413
473
ret = connect(tcp_sd, &to.in, sizeof(to));
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
474
415
if (ret < 0){
475
416
perror("connect");
476
417
return -1;
477
418
}
478
479
const char *out = mandos_protocol_version;
480
written = 0;
481
while (true){
482
size_t out_size = strlen(out);
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
484
out_size - written));
485
if (ret == -1){
486
perror("write");
487
retval = -1;
488
goto mandos_end;
489
}
490
written += (size_t)ret;
491
if(written < out_size){
492
continue;
493
} else {
494
if (out == mandos_protocol_version){
495
written = 0;
496
out = "\r\n";
497
} else {
498
break;
499
}
500
}
419
420
ret = initgnutls (&es);
421
if (ret != 0){
422
retval = -1;
423
return -1;
501
424
}
502
425
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
428
503
429
if(debug){
504
430
fprintf(stderr, "Establishing TLS session with %s\n", ip);
505
431
}
506
432
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
433
ret = gnutls_handshake (es.session);
510
434
511
435
if (ret != GNUTLS_E_SUCCESS){
512
436
if(debug){
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
437
fprintf(stderr, "\n*** Handshake failed ***\n");
514
438
gnutls_perror (ret);
515
439
}
516
440
retval = -1;
517
goto mandos_end;
441
goto exit;
518
442
}
519
443
520
/* Read OpenPGP packet that contains the wanted password */
444
//Retrieve OpenPGP packet that contains the wanted password
521
445
522
446
if(debug){
523
447
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
525
449
}
526
450
527
451
while(true){
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
529
buffer_capacity);
530
if (buffer_capacity == 0){
531
perror("adjustbuffer");
532
retval = -1;
533
goto mandos_end;
452
if (buffer_length + BUFFER_SIZE > buffer_capacity){
453
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
454
if (buffer == NULL){
455
perror("realloc");
456
goto exit;
457
}
458
buffer_capacity += BUFFER_SIZE;
534
459
}
535
460
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
538
463
if (ret == 0){
539
464
break;
540
465
}
544
469
case GNUTLS_E_AGAIN:
545
470
break;
546
471
case GNUTLS_E_REHANDSHAKE:
547
ret = gnutls_handshake (session);
472
ret = gnutls_handshake (es.session);
548
473
if (ret < 0){
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
474
fprintf(stderr, "\n*** Handshake failed ***\n");
550
475
gnutls_perror (ret);
551
476
retval = -1;
552
goto mandos_end;
477
goto exit;
553
478
}
554
479
break;
555
480
default:
556
481
fprintf(stderr, "Unknown error while reading data from"
557
" encrypted session with Mandos server\n");
482
" encrypted session with mandos server\n");
558
483
retval = -1;
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
560
goto mandos_end;
484
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
485
goto exit;
561
486
}
562
487
} else {
563
488
buffer_length += (size_t) ret;
564
489
}
565
490
}
566
491
567
if(debug){
568
fprintf(stderr, "Closing TLS session\n");
569
}
570
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
572
573
492
if (buffer_length > 0){
574
493
decrypted_buffer_size = pgp_packet_decrypt(buffer,
575
494
buffer_length,
576
495
&decrypted_buffer,
577
keydir);
496
certdir);
578
497
if (decrypted_buffer_size >= 0){
579
written = 0;
580
498
while(written < (size_t) decrypted_buffer_size){
581
499
ret = (int)fwrite (decrypted_buffer + written, 1,
582
500
(size_t)decrypted_buffer_size - written,
596
514
retval = -1;
597
515
}
598
516
}
599
600
/* Shutdown procedure */
601
602
mandos_end:
517
518
//shutdown procedure
519
520
if(debug){
521
fprintf(stderr, "Closing TLS session\n");
522
}
523
603
524
free(buffer);
525
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
526
exit:
604
527
close(tcp_sd);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
528
gnutls_deinit (es.session);
529
gnutls_certificate_free_credentials (es.cred);
607
530
gnutls_global_deinit ();
608
531
return retval;
609
532
}
610
533
611
static void resolve_callback(AvahiSServiceResolver *r,
612
AvahiIfIndex interface,
613
AVAHI_GCC_UNUSED AvahiProtocol protocol,
614
AvahiResolverEvent event,
615
const char *name,
616
const char *type,
617
const char *domain,
618
const char *host_name,
619
const AvahiAddress *address,
620
uint16_t port,
621
AVAHI_GCC_UNUSED AvahiStringList *txt,
622
AVAHI_GCC_UNUSED AvahiLookupResultFlags
623
flags,
624
void* userdata) {
625
mandos_context *mc = userdata;
534
static AvahiSimplePoll *simple_poll = NULL;
535
static AvahiServer *server = NULL;
536
537
static void resolve_callback(
538
AvahiSServiceResolver *r,
539
AvahiIfIndex interface,
540
AVAHI_GCC_UNUSED AvahiProtocol protocol,
541
AvahiResolverEvent event,
542
const char *name,
543
const char *type,
544
const char *domain,
545
const char *host_name,
546
const AvahiAddress *address,
547
uint16_t port,
548
AVAHI_GCC_UNUSED AvahiStringList *txt,
549
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
550
AVAHI_GCC_UNUSED void* userdata) {
551
626
552
assert(r); /* Spurious warning */
627
553
628
554
/* Called whenever a service has been resolved successfully or
631
557
switch (event) {
632
558
default:
633
559
case AVAHI_RESOLVER_FAILURE:
634
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
635
" of type '%s' in domain '%s': %s\n", name, type, domain,
636
avahi_strerror(avahi_server_errno(mc->server)));
560
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
561
" type '%s' in domain '%s': %s\n", name, type, domain,
562
avahi_strerror(avahi_server_errno(server)));
637
563
break;
638
564
639
565
case AVAHI_RESOLVER_FOUND:
641
567
char ip[AVAHI_ADDRESS_STR_MAX];
642
568
avahi_address_snprint(ip, sizeof(ip), address);
643
569
if(debug){
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" port %d\n", name, host_name, ip, port);
646
572
}
647
int ret = start_mandos_communication(ip, port, interface, mc);
573
int ret = start_mandos_communication(ip, port, interface);
648
574
if (ret == 0){
649
575
exit(EXIT_SUCCESS);
650
576
}
653
579
avahi_s_service_resolver_free(r);
654
580
}
655
581
656
static void browse_callback( AvahiSServiceBrowser *b,
657
AvahiIfIndex interface,
658
AvahiProtocol protocol,
659
AvahiBrowserEvent event,
660
const char *name,
661
const char *type,
662
const char *domain,
663
AVAHI_GCC_UNUSED AvahiLookupResultFlags
664
flags,
665
void* userdata) {
666
mandos_context *mc = userdata;
667
assert(b); /* Spurious warning */
668
669
/* Called whenever a new services becomes available on the LAN or
670
is removed from the LAN */
671
672
switch (event) {
673
default:
674
case AVAHI_BROWSER_FAILURE:
675
676
fprintf(stderr, "(Avahi browser) %s\n",
677
avahi_strerror(avahi_server_errno(mc->server)));
678
avahi_simple_poll_quit(mc->simple_poll);
679
return;
680
681
case AVAHI_BROWSER_NEW:
682
/* We ignore the returned Avahi resolver object. In the callback
683
function we free it. If the Avahi server is terminated before
684
the callback function is called the Avahi server will free the
685
resolver for us. */
686
687
if (!(avahi_s_service_resolver_new(mc->server, interface,
688
protocol, name, type, domain,
689
AVAHI_PROTO_INET6, 0,
690
resolve_callback, mc)))
691
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
692
name, avahi_strerror(avahi_server_errno(mc->server)));
693
break;
694
695
case AVAHI_BROWSER_REMOVE:
696
break;
697
698
case AVAHI_BROWSER_ALL_FOR_NOW:
699
case AVAHI_BROWSER_CACHE_EXHAUSTED:
700
if(debug){
701
fprintf(stderr, "No Mandos server found, still searching...\n");
582
static void browse_callback(
583
AvahiSServiceBrowser *b,
584
AvahiIfIndex interface,
585
AvahiProtocol protocol,
586
AvahiBrowserEvent event,
587
const char *name,
588
const char *type,
589
const char *domain,
590
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
591
void* userdata) {
592
593
AvahiServer *s = userdata;
594
assert(b); /* Spurious warning */
595
596
/* Called whenever a new services becomes available on the LAN or
597
is removed from the LAN */
598
599
switch (event) {
600
default:
601
case AVAHI_BROWSER_FAILURE:
602
603
fprintf(stderr, "(Browser) %s\n",
604
avahi_strerror(avahi_server_errno(server)));
605
avahi_simple_poll_quit(simple_poll);
606
return;
607
608
case AVAHI_BROWSER_NEW:
609
/* We ignore the returned resolver object. In the callback
610
function we free it. If the server is terminated before
611
the callback function is called the server will free
612
the resolver for us. */
613
614
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
615
type, domain,
616
AVAHI_PROTO_INET6, 0,
617
resolve_callback, s)))
618
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
619
avahi_strerror(avahi_server_errno(s)));
620
break;
621
622
case AVAHI_BROWSER_REMOVE:
623
break;
624
625
case AVAHI_BROWSER_ALL_FOR_NOW:
626
case AVAHI_BROWSER_CACHE_EXHAUSTED:
627
break;
702
628
}
703
break;
704
}
705
629
}
706
630
707
631
/* Combines file name and path and returns the malloced new
714
638
return NULL;
715
639
}
716
640
if(f_len > 0){
717
memcpy(tmp, first, f_len); /* Spurious warning */
641
memcpy(tmp, first, f_len);
718
642
}
719
643
tmp[f_len] = '/';
720
644
if(s_len > 0){
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
645
memcpy(tmp + f_len + 1, second, s_len);
722
646
}
723
647
tmp[f_len + 1 + s_len] = '\0';
724
648
return tmp;
725
649
}
726
650
727
651
728
int main(int argc, char *argv[]){
652
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
653
AvahiServerConfig config;
729
654
AvahiSServiceBrowser *sb = NULL;
730
655
int error;
731
656
int ret;
732
int exitcode = EXIT_SUCCESS;
733
const char *interface = "eth0";
734
struct ifreq network;
735
int sd;
736
uid_t uid;
737
gid_t gid;
657
int returncode = EXIT_SUCCESS;
658
const char *interface = NULL;
659
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
660
char *connect_to = NULL;
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
743
.dh_bits = 1024, .priority = "SECURE256"};
744
745
{
746
struct argp_option options[] = {
747
{ .name = "debug", .key = 128,
748
.doc = "Debug mode", .group = 3 },
749
{ .name = "connect", .key = 'c',
750
.arg = "IP",
751
.doc = "Connect directly to a sepcified mandos server",
752
.group = 1 },
753
{ .name = "interface", .key = 'i',
754
.arg = "INTERFACE",
755
.doc = "Interface that Avahi will conntect through",
756
.group = 1 },
757
{ .name = "keydir", .key = 'd',
758
.arg = "KEYDIR",
759
.doc = "Directory where the openpgp keyring is",
760
.group = 1 },
761
{ .name = "seckey", .key = 's',
762
.arg = "SECKEY",
763
.doc = "Secret openpgp key for gnutls authentication",
764
.group = 1 },
765
{ .name = "pubkey", .key = 'p',
766
.arg = "PUBKEY",
767
.doc = "Public openpgp key for gnutls authentication",
768
.group = 2 },
769
{ .name = "dh-bits", .key = 129,
770
.arg = "BITS",
771
.doc = "dh-bits to use in gnutls communication",
772
.group = 2 },
773
{ .name = "priority", .key = 130,
774
.arg = "PRIORITY",
775
.doc = "GNUTLS priority", .group = 1 },
776
{ .name = NULL }
777
};
778
779
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
784
switch (key) {
785
case 128:
786
debug = true;
787
break;
788
case 'c':
789
connect_to = arg;
790
break;
791
case 'i':
792
interface = arg;
793
break;
794
case 'd':
795
keydir = arg;
796
break;
797
case 's':
798
seckeyfile = arg;
799
break;
800
case 'p':
801
pubkeyfile = arg;
802
break;
803
case 129:
804
errno = 0;
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
if (errno){
807
perror("strtol");
808
exit(EXIT_FAILURE);
809
}
810
break;
811
case 130:
812
mc.priority = arg;
813
break;
814
case ARGP_KEY_ARG:
815
argp_usage (state);
816
break;
817
case ARGP_KEY_END:
818
break;
819
default:
820
return ARGP_ERR_UNKNOWN;
821
}
822
return 0;
823
}
824
825
struct argp argp = { .options = options, .parser = parse_opt,
826
.args_doc = "",
827
.doc = "Mandos client -- Get and decrypt"
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
}
831
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
835
exitcode = EXIT_FAILURE;
836
goto end;
837
}
838
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
842
goto end;
843
}
844
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
846
if (ret == -1){
847
fprintf(stderr, "init_gnutls_global\n");
848
goto end;
849
}
850
851
uid = getuid();
852
gid = getgid();
853
854
ret = setuid(uid);
855
if (ret == -1){
856
perror("setuid");
857
}
858
859
setgid(gid);
860
if (ret == -1){
861
perror("setgid");
862
}
863
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
865
if(if_index == 0){
866
fprintf(stderr, "No such interface: \"%s\"\n", interface);
867
exit(EXIT_FAILURE);
661
662
while (true){
663
static struct option long_options[] = {
664
{"debug", no_argument, (int *)&debug, 1},
665
{"connect", required_argument, 0, 'C'},
666
{"interface", required_argument, 0, 'i'},
667
{"certdir", required_argument, 0, 'd'},
668
{"certkey", required_argument, 0, 'c'},
669
{"certfile", required_argument, 0, 'k'},
670
{0, 0, 0, 0} };
671
672
int option_index = 0;
673
ret = getopt_long (argc, argv, "i:", long_options,
674
&option_index);
675
676
if (ret == -1){
677
break;
678
}
679
680
switch(ret){
681
case 0:
682
break;
683
case 'i':
684
interface = optarg;
685
break;
686
case 'C':
687
connect_to = optarg;
688
break;
689
case 'd':
690
certdir = optarg;
691
break;
692
case 'c':
693
certfile = optarg;
694
break;
695
case 'k':
696
certkey = optarg;
697
break;
698
default:
699
exit(EXIT_FAILURE);
700
}
701
}
702
703
certfile = combinepath(certdir, certfile);
704
if (certfile == NULL){
705
perror("combinepath");
706
goto exit;
707
}
708
709
if(interface != NULL){
710
if_index = (AvahiIfIndex) if_nametoindex(interface);
711
if(if_index == 0){
712
fprintf(stderr, "No such interface: \"%s\"\n", interface);
713
exit(EXIT_FAILURE);
714
}
868
715
}
869
716
870
717
if(connect_to != NULL){
873
720
char *address = strrchr(connect_to, ':');
874
721
if(address == NULL){
875
722
fprintf(stderr, "No colon in address\n");
876
exitcode = EXIT_FAILURE;
877
goto end;
723
exit(EXIT_FAILURE);
878
724
}
879
725
errno = 0;
880
726
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
881
727
if(errno){
882
728
perror("Bad port number");
883
exitcode = EXIT_FAILURE;
884
goto end;
729
exit(EXIT_FAILURE);
885
730
}
886
731
*address = '\0';
887
732
address = connect_to;
888
ret = start_mandos_communication(address, port, if_index, &mc);
733
ret = start_mandos_communication(address, port, if_index);
889
734
if(ret < 0){
890
exitcode = EXIT_FAILURE;
735
exit(EXIT_FAILURE);
891
736
} else {
892
exitcode = EXIT_SUCCESS;
737
exit(EXIT_SUCCESS);
893
738
}
894
goto end;
895
739
}
896
740
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
if(ret == -1){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
741
certkey = combinepath(certdir, certkey);
742
if (certkey == NULL){
743
perror("combinepath");
744
goto exit;
922
745
}
923
746
924
747
if (not debug){
925
748
avahi_set_log_function(empty_log);
926
749
}
927
750
928
/* Initialize the pseudo-RNG for Avahi */
751
/* Initialize the psuedo-RNG */
929
752
srand((unsigned int) time(NULL));
930
931
/* Allocate main Avahi loop object */
932
mc.simple_poll = avahi_simple_poll_new();
933
if (mc.simple_poll == NULL) {
934
fprintf(stderr, "Avahi: Failed to create simple poll"
935
" object.\n");
936
exitcode = EXIT_FAILURE;
937
goto end;
938
}
939
940
{
941
AvahiServerConfig config;
942
/* Do not publish any local Zeroconf records */
943
avahi_server_config_init(&config);
944
config.publish_hinfo = 0;
945
config.publish_addresses = 0;
946
config.publish_workstation = 0;
947
config.publish_domain = 0;
948
949
/* Allocate a new server */
950
mc.server = avahi_server_new(avahi_simple_poll_get
951
(mc.simple_poll), &config, NULL,
952
NULL, &error);
953
954
/* Free the Avahi configuration data */
955
avahi_server_config_free(&config);
956
}
957
958
/* Check if creating the Avahi server object succeeded */
959
if (mc.server == NULL) {
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
753
754
/* Allocate main loop object */
755
if (!(simple_poll = avahi_simple_poll_new())) {
756
fprintf(stderr, "Failed to create simple poll object.\n");
757
758
goto exit;
759
}
760
761
/* Do not publish any local records */
762
avahi_server_config_init(&config);
763
config.publish_hinfo = 0;
764
config.publish_addresses = 0;
765
config.publish_workstation = 0;
766
config.publish_domain = 0;
767
768
/* Allocate a new server */
769
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
770
&config, NULL, NULL, &error);
771
772
/* Free the configuration data */
773
avahi_server_config_free(&config);
774
775
/* Check if creating the server object succeeded */
776
if (!server) {
777
fprintf(stderr, "Failed to create server: %s\n",
961
778
avahi_strerror(error));
962
exitcode = EXIT_FAILURE;
963
goto end;
779
returncode = EXIT_FAILURE;
780
goto exit;
964
781
}
965
782
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
783
/* Create the service browser */
784
sb = avahi_s_service_browser_new(server, if_index,
968
785
AVAHI_PROTO_INET6,
969
786
"_mandos._tcp", NULL, 0,
970
browse_callback, &mc);
971
if (sb == NULL) {
787
browse_callback, server);
788
if (!sb) {
972
789
fprintf(stderr, "Failed to create service browser: %s\n",
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
790
avahi_strerror(avahi_server_errno(server)));
791
returncode = EXIT_FAILURE;
792
goto exit;
976
793
}
977
794
978
795
/* Run the main loop */
979
796
980
797
if (debug){
981
fprintf(stderr, "Starting Avahi loop search\n");
798
fprintf(stderr, "Starting avahi loop search\n");
982
799
}
983
800
984
avahi_simple_poll_loop(mc.simple_poll);
801
avahi_simple_poll_loop(simple_poll);
985
802
986
end:
803
exit:
987
804
988
805
if (debug){
989
806
fprintf(stderr, "%s exiting\n", argv[0]);
990
807
}
991
808
992
809
/* Cleanup things */
993
if (sb != NULL)
810
if (sb)
994
811
avahi_s_service_browser_free(sb);
995
812
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
813
if (server)
814
avahi_server_free(server);
998
815
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
816
if (simple_poll)
817
avahi_simple_poll_free(simple_poll);
818
free(certfile);
819
free(certkey);
1003
820
1004
return exitcode;
821
return returncode;
1005
822
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0