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- Committer: Björn Påhlsson
- Date: 2008-08-02 15:47:42 UTC
- mfrom: (36 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 38.
- Revision ID: belorn@braxen-20080802154742-pixsom1utki8x3yo
merge
added
removed
plugins.d/mandosclient.c
32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
34
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
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 */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
46
42
47
43
#include <avahi-core/core.h>
48
44
#include <avahi-core/lookup.h>
51
47
#include <avahi-common/malloc.h>
52
48
#include <avahi-common/error.h>
53
49
54
/* Mandos client part */
50
//mandos client part
55
51
#include <sys/types.h> /* socket(), inet_pton() */
56
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
53
struct in6_addr, inet_pton() */
64
60
#include <string.h> /* memset */
65
61
#include <arpa/inet.h> /* inet_pton() */
66
62
#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 */
63
64
// gpgme
72
65
#include <errno.h> /* perror() */
73
66
#include <gpgme.h>
74
67
68
// getopt long
69
#include <getopt.h>
70
75
71
#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";
76
77
77
78
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
79
83
/* Used for passing in values through the Avahi callback functions */
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
280
return -1;
323
281
}
324
282
325
283
if(debug){
326
284
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
328
seckeyfile);
285
" and keyfile %s as GnuTLS credentials\n", certfile,
286
certkey);
329
287
}
330
288
331
289
ret = gnutls_certificate_set_openpgp_key_file
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
290
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
333
291
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",
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",
338
297
safer_gnutls_strerror(ret));
339
298
return -1;
340
299
}
341
300
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){
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){
367
321
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
368
322
safer_gnutls_strerror(ret));
369
323
}
370
324
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
}
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;
380
331
}
381
332
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",
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",
386
337
safer_gnutls_strerror(ret));
387
338
return -1;
388
339
}
389
340
390
341
/* ignore client certificate if any. */
391
gnutls_certificate_server_set_request (*session,
342
gnutls_certificate_server_set_request (es->session,
392
343
GNUTLS_CERT_IGNORE);
393
344
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
345
gnutls_dh_set_prime_bits (es->session, DH_BITS);
395
346
396
347
return 0;
397
348
}
398
349
399
/* Avahi log function callback */
400
350
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
401
351
__attribute__((unused)) const char *txt){}
402
352
403
/* Called when a Mandos server is found */
404
353
static int start_mandos_communication(const char *ip, uint16_t port,
405
AvahiIfIndex if_index,
406
mandos_context *mc){
354
AvahiIfIndex if_index){
407
355
int ret, tcp_sd;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
356
struct sockaddr_in6 to;
357
encrypted_session es;
409
358
char *buffer = NULL;
410
359
char *decrypted_buffer;
411
360
size_t buffer_length = 0;
412
361
size_t buffer_capacity = 0;
413
362
ssize_t decrypted_buffer_size;
414
size_t written;
363
size_t written = 0;
415
364
int retval = 0;
416
365
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
366
424
367
if(debug){
425
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
434
377
435
378
if(debug){
436
379
if(if_indextoname((unsigned int)if_index, interface) == NULL){
437
perror("if_indextoname");
380
if(debug){
381
perror("if_indextoname");
382
}
438
383
return -1;
439
384
}
385
440
386
fprintf(stderr, "Binding to interface %s\n", interface);
441
387
}
442
388
443
389
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);
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
448
392
if (ret < 0 ){
449
393
perror("inet_pton");
450
394
return -1;
451
}
395
}
452
396
if(ret == 0){
453
397
fprintf(stderr, "Bad address: %s\n", ip);
454
398
return -1;
455
399
}
456
to.in6.sin6_port = htons(port); /* Spurious warning */
400
to.sin6_port = htons(port); /* Spurious warning */
457
401
458
to.in6.sin6_scope_id = (uint32_t)if_index;
402
to.sin6_scope_id = (uint32_t)if_index;
459
403
460
404
if(debug){
461
405
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
}
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
/* } */
471
414
}
472
415
473
ret = connect(tcp_sd, &to.in, sizeof(to));
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
474
417
if (ret < 0){
475
418
perror("connect");
476
419
return -1;
477
420
}
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
}
421
422
ret = initgnutls (&es);
423
if (ret != 0){
424
retval = -1;
425
return -1;
501
426
}
502
427
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
430
503
431
if(debug){
504
432
fprintf(stderr, "Establishing TLS session with %s\n", ip);
505
433
}
506
434
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
508
509
ret = gnutls_handshake (session);
435
ret = gnutls_handshake (es.session);
510
436
511
437
if (ret != GNUTLS_E_SUCCESS){
512
438
if(debug){
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
439
fprintf(stderr, "\n*** Handshake failed ***\n");
514
440
gnutls_perror (ret);
515
441
}
516
442
retval = -1;
517
goto mandos_end;
443
goto exit;
518
444
}
519
445
520
/* Read OpenPGP packet that contains the wanted password */
446
//Retrieve OpenPGP packet that contains the wanted password
521
447
522
448
if(debug){
523
449
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
525
451
}
526
452
527
453
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;
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;
534
461
}
535
462
536
ret = gnutls_record_recv(session, buffer+buffer_length,
537
BUFFER_SIZE);
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
538
465
if (ret == 0){
539
466
break;
540
467
}
544
471
case GNUTLS_E_AGAIN:
545
472
break;
546
473
case GNUTLS_E_REHANDSHAKE:
547
ret = gnutls_handshake (session);
474
ret = gnutls_handshake (es.session);
548
475
if (ret < 0){
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
476
fprintf(stderr, "\n*** Handshake failed ***\n");
550
477
gnutls_perror (ret);
551
478
retval = -1;
552
goto mandos_end;
479
goto exit;
553
480
}
554
481
break;
555
482
default:
556
483
fprintf(stderr, "Unknown error while reading data from"
557
" encrypted session with Mandos server\n");
484
" encrypted session with mandos server\n");
558
485
retval = -1;
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
560
goto mandos_end;
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
487
goto exit;
561
488
}
562
489
} else {
563
490
buffer_length += (size_t) ret;
564
491
}
565
492
}
566
493
567
if(debug){
568
fprintf(stderr, "Closing TLS session\n");
569
}
570
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
572
573
494
if (buffer_length > 0){
574
495
decrypted_buffer_size = pgp_packet_decrypt(buffer,
575
496
buffer_length,
576
497
&decrypted_buffer,
577
keydir);
498
certdir);
578
499
if (decrypted_buffer_size >= 0){
579
written = 0;
580
500
while(written < (size_t) decrypted_buffer_size){
581
501
ret = (int)fwrite (decrypted_buffer + written, 1,
582
502
(size_t)decrypted_buffer_size - written,
596
516
retval = -1;
597
517
}
598
518
}
599
600
/* Shutdown procedure */
601
602
mandos_end:
519
520
//shutdown procedure
521
522
if(debug){
523
fprintf(stderr, "Closing TLS session\n");
524
}
525
603
526
free(buffer);
527
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
exit:
604
529
close(tcp_sd);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
530
gnutls_deinit (es.session);
531
gnutls_certificate_free_credentials (es.cred);
607
532
gnutls_global_deinit ();
608
533
return retval;
609
534
}
610
535
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;
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
626
554
assert(r); /* Spurious warning */
627
555
628
556
/* Called whenever a service has been resolved successfully or
631
559
switch (event) {
632
560
default:
633
561
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)));
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)));
637
565
break;
638
566
639
567
case AVAHI_RESOLVER_FOUND:
641
569
char ip[AVAHI_ADDRESS_STR_MAX];
642
570
avahi_address_snprint(ip, sizeof(ip), address);
643
571
if(debug){
644
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
645
" port %d\n", name, host_name, ip, interface, port);
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" port %d\n", name, host_name, ip, port);
646
574
}
647
int ret = start_mandos_communication(ip, port, interface, mc);
575
int ret = start_mandos_communication(ip, port, interface);
648
576
if (ret == 0){
649
577
exit(EXIT_SUCCESS);
650
578
}
653
581
avahi_s_service_resolver_free(r);
654
582
}
655
583
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");
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;
702
630
}
703
break;
704
}
705
631
}
706
632
707
633
/* Combines file name and path and returns the malloced new
714
640
return NULL;
715
641
}
716
642
if(f_len > 0){
717
memcpy(tmp, first, f_len); /* Spurious warning */
643
memcpy(tmp, first, f_len);
718
644
}
719
645
tmp[f_len] = '/';
720
646
if(s_len > 0){
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
647
memcpy(tmp + f_len + 1, second, s_len);
722
648
}
723
649
tmp[f_len + 1 + s_len] = '\0';
724
650
return tmp;
725
651
}
726
652
727
653
728
int main(int argc, char *argv[]){
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
729
656
AvahiSServiceBrowser *sb = NULL;
730
657
int error;
731
658
int ret;
732
int exitcode = EXIT_SUCCESS;
659
int returncode = EXIT_SUCCESS;
733
660
const char *interface = "eth0";
734
661
struct ifreq network;
735
662
int sd;
736
uid_t uid;
737
gid_t gid;
738
663
char *connect_to = NULL;
739
664
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");
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;
862
719
}
863
720
864
721
if_index = (AvahiIfIndex) if_nametoindex(interface);
873
730
char *address = strrchr(connect_to, ':');
874
731
if(address == NULL){
875
732
fprintf(stderr, "No colon in address\n");
876
exitcode = EXIT_FAILURE;
877
goto end;
733
exit(EXIT_FAILURE);
878
734
}
879
735
errno = 0;
880
736
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
881
737
if(errno){
882
738
perror("Bad port number");
883
exitcode = EXIT_FAILURE;
884
goto end;
739
exit(EXIT_FAILURE);
885
740
}
886
741
*address = '\0';
887
742
address = connect_to;
888
ret = start_mandos_communication(address, port, if_index, &mc);
743
ret = start_mandos_communication(address, port, if_index);
889
744
if(ret < 0){
890
exitcode = EXIT_FAILURE;
745
exit(EXIT_FAILURE);
891
746
} else {
892
exitcode = EXIT_SUCCESS;
747
exit(EXIT_SUCCESS);
893
748
}
894
goto end;
895
749
}
896
750
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);
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);
907
768
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);
769
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
771
goto exit;
772
}
922
773
}
774
close(sd);
923
775
924
776
if (not debug){
925
777
avahi_set_log_function(empty_log);
926
778
}
927
779
928
/* Initialize the pseudo-RNG for Avahi */
780
/* Initialize the psuedo-RNG */
929
781
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",
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",
961
807
avahi_strerror(error));
962
exitcode = EXIT_FAILURE;
963
goto end;
808
returncode = EXIT_FAILURE;
809
goto exit;
964
810
}
965
811
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
812
/* Create the service browser */
813
sb = avahi_s_service_browser_new(server, if_index,
968
814
AVAHI_PROTO_INET6,
969
815
"_mandos._tcp", NULL, 0,
970
browse_callback, &mc);
971
if (sb == NULL) {
816
browse_callback, server);
817
if (!sb) {
972
818
fprintf(stderr, "Failed to create service browser: %s\n",
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
975
goto end;
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
821
goto exit;
976
822
}
977
823
978
824
/* Run the main loop */
979
825
980
826
if (debug){
981
fprintf(stderr, "Starting Avahi loop search\n");
827
fprintf(stderr, "Starting avahi loop search\n");
982
828
}
983
829
984
avahi_simple_poll_loop(mc.simple_poll);
830
avahi_simple_poll_loop(simple_poll);
985
831
986
end:
832
exit:
987
833
988
834
if (debug){
989
835
fprintf(stderr, "%s exiting\n", argv[0]);
990
836
}
991
837
992
838
/* Cleanup things */
993
if (sb != NULL)
839
if (sb)
994
840
avahi_s_service_browser_free(sb);
995
841
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
842
if (server)
843
avahi_server_free(server);
998
844
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);
1001
free(pubkeyfile);
1002
free(seckeyfile);
845
if (simple_poll)
846
avahi_simple_poll_free(simple_poll);
847
free(certfile);
848
free(certkey);
1003
849
1004
return exitcode;
850
return returncode;
1005
851
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0