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- Committer: Teddy Hogeborn
- Date: 2008-08-24 10:49:09 UTC
- mfrom: (24.1.63 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080824104909-loh761dpgglkvos1
* mandos (fingerprint): Bug fix: Check crtverify.value, not crtverify.
* mandos-keygen (password): Also print "host = ".
* plugins.d/password-request.c (pgp_packet_decrypt): Only print
detailed result
of decryption if
it failed.
* mandos-keygen (password): Also print "host = ".
* plugins.d/password-request.c (pgp_packet_decrypt): Only print
detailed result
of decryption if
it failed.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
36
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
36
38
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
38
stdout, ferror() */
40
39
#include <stdint.h> /* uint16_t, uint32_t */
41
40
#include <stddef.h> /* NULL, size_t, ssize_t */
42
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
48
sockaddr_in6, PF_INET6,
50
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
53
struct in6_addr, inet_pton(),
56
54
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, SCNu16 */
61
55
#include <assert.h> /* assert() */
62
56
#include <errno.h> /* perror(), errno */
63
57
#include <time.h> /* time() */
64
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
59
SIOCSIFFLAGS, if_indextoname(),
66
60
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
62
getuid(), getgid(), setuid(),
70
63
setgid() */
64
#include <netinet/in.h>
71
65
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
66
#include <iso646.h> /* not, and */
73
67
#include <argp.h> /* struct argp_option, error_t, struct
74
68
argp_state, struct argp,
75
69
argp_parse(), ARGP_KEY_ARG,
92
86
gnutls_*
93
87
init_gnutls_session(),
94
88
GNUTLS_* */
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
97
90
GNUTLS_OPENPGP_FMT_BASE64 */
98
91
99
92
/* GPGME */
105
98
106
99
#define BUFFER_SIZE 256
107
100
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
112
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
113
103
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
115
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
106
117
107
/* Used for passing in values through the Avahi callback functions */
122
112
unsigned int dh_bits;
123
113
gnutls_dh_params_t dh_params;
124
114
const char *priority;
125
gpgme_ctx_t ctx;
126
115
} mandos_context;
127
116
128
117
/*
132
121
*/
133
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
123
size_t buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
126
if (buffer == NULL){
138
127
return 0;
139
128
}
140
129
buffer_capacity += BUFFER_SIZE;
143
132
}
144
133
145
134
/*
146
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
147
137
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
151
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
152
148
gpgme_engine_info_t engine_info;
153
149
154
155
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
157
*/
158
bool import_key(const char *filename){
159
int fd;
160
gpgme_data_t pgp_data;
161
162
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
if(fd == -1){
164
perror("open");
165
return false;
166
}
167
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if(rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if(rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
190
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
152
}
193
153
194
154
/* Init GPGME */
195
155
gpgme_check_version(NULL);
196
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
198
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
159
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
160
return -1;
201
161
}
202
162
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info(&engine_info);
205
if(rc != GPG_ERR_NO_ERROR){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
206
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
167
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
168
return -1;
209
169
}
210
170
while(engine_info != NULL){
211
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
214
174
break;
215
175
}
216
176
engine_info = engine_info->next;
217
177
}
218
178
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if(not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
254
181
}
255
182
256
183
/* Create new GPGME data buffer from memory cryptotext */
257
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
185
0);
259
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
260
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
188
gpgme_strsource(rc), gpgme_strerror(rc));
262
189
return -1;
264
191
265
192
/* Create new empty GPGME data buffer for the plaintext */
266
193
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
268
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
196
gpgme_strsource(rc), gpgme_strerror(rc));
270
197
gpgme_data_release(dh_crypto);
271
198
return -1;
272
199
}
273
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
274
210
/* Decrypt data from the cryptotext data buffer to the plaintext
275
211
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
278
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
215
gpgme_strsource(rc), gpgme_strerror(rc));
280
216
plaintext_length = -1;
281
if(debug){
217
if (debug){
282
218
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
285
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
222
} else {
287
223
fprintf(stderr, "Unsupported algorithm: %s\n",
314
250
}
315
251
316
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
319
255
plaintext_length = -1;
320
256
goto decrypt_end;
321
257
}
325
261
plaintext_capacity = adjustbuffer(plaintext,
326
262
(size_t)plaintext_length,
327
263
plaintext_capacity);
328
if(plaintext_capacity == 0){
264
if (plaintext_capacity == 0){
329
265
perror("adjustbuffer");
330
266
plaintext_length = -1;
331
267
goto decrypt_end;
334
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
271
BUFFER_SIZE);
336
272
/* Print the data, if any */
337
if(ret == 0){
273
if (ret == 0){
338
274
/* EOF */
339
275
break;
340
276
}
345
281
}
346
282
plaintext_length += ret;
347
283
}
348
284
349
285
if(debug){
350
286
fprintf(stderr, "Decrypted password is: ");
351
287
for(ssize_t i = 0; i < plaintext_length; i++){
364
300
return plaintext_length;
365
301
}
366
302
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning */
369
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
370
306
ret = "(unknown)";
371
307
return ret;
372
308
}
387
323
}
388
324
389
325
ret = gnutls_global_init();
390
if(ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
393
329
return -1;
394
330
}
395
331
396
if(debug){
332
if (debug){
397
333
/* "Use a log level over 10 to enable all debugging options."
398
334
* - GnuTLS manual
399
335
*/
403
339
404
340
/* OpenPGP credentials */
405
341
gnutls_certificate_allocate_credentials(&mc->cred);
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit();
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
411
347
return -1;
412
348
}
413
349
414
350
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
417
353
seckeyfilename);
418
354
}
419
355
420
356
ret = gnutls_certificate_set_openpgp_key_file
421
357
(mc->cred, pubkeyfilename, seckeyfilename,
422
358
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
359
if (ret != GNUTLS_E_SUCCESS) {
424
360
fprintf(stderr,
425
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
428
364
safer_gnutls_strerror(ret));
429
365
goto globalfail;
430
366
}
431
367
432
368
/* GnuTLS server initialization */
433
369
ret = gnutls_dh_params_init(&mc->dh_params);
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
437
373
goto globalfail;
438
374
}
439
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
443
379
goto globalfail;
444
380
}
445
381
446
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
383
448
384
return 0;
449
385
450
386
globalfail:
451
387
452
388
gnutls_certificate_free_credentials(mc->cred);
453
389
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
455
390
return -1;
391
456
392
}
457
393
458
394
static int init_gnutls_session(mandos_context *mc,
460
396
int ret;
461
397
/* GnuTLS session creation */
462
398
ret = gnutls_init(session, GNUTLS_SERVER);
463
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
464
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
401
safer_gnutls_strerror(ret));
466
402
}
468
404
{
469
405
const char *err;
470
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if(ret != GNUTLS_E_SUCCESS) {
407
if (ret != GNUTLS_E_SUCCESS) {
472
408
fprintf(stderr, "Syntax error at: %s\n", err);
473
409
fprintf(stderr, "GnuTLS error: %s\n",
474
410
safer_gnutls_strerror(ret));
475
gnutls_deinit(*session);
411
gnutls_deinit (*session);
476
412
return -1;
477
413
}
478
414
}
479
415
480
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
417
mc->cred);
482
if(ret != GNUTLS_E_SUCCESS) {
418
if (ret != GNUTLS_E_SUCCESS) {
483
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
420
safer_gnutls_strerror(ret));
485
gnutls_deinit(*session);
421
gnutls_deinit (*session);
486
422
return -1;
487
423
}
488
424
489
425
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
492
428
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
494
430
495
431
return 0;
496
432
}
504
440
AvahiIfIndex if_index,
505
441
mandos_context *mc){
506
442
int ret, tcp_sd;
507
ssize_t sret;
508
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
509
444
char *buffer = NULL;
510
445
char *decrypted_buffer;
516
451
char interface[IF_NAMESIZE];
517
452
gnutls_session_t session;
518
453
519
ret = init_gnutls_session(mc, &session);
520
if(ret != 0){
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
521
456
return -1;
522
457
}
523
458
531
466
perror("socket");
532
467
return -1;
533
468
}
534
469
535
470
if(debug){
536
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
537
472
perror("if_indextoname");
545
480
/* It would be nice to have a way to detect if we were passed an
546
481
IPv4 address here. Now we assume an IPv6 address. */
547
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
548
if(ret < 0 ){
483
if (ret < 0 ){
549
484
perror("inet_pton");
550
485
return -1;
551
486
}
572
507
}
573
508
574
509
ret = connect(tcp_sd, &to.in, sizeof(to));
575
if(ret < 0){
510
if (ret < 0){
576
511
perror("connect");
577
512
return -1;
578
513
}
579
514
580
515
const char *out = mandos_protocol_version;
581
516
written = 0;
582
while(true){
517
while (true){
583
518
size_t out_size = strlen(out);
584
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
585
520
out_size - written));
586
if(ret == -1){
521
if (ret == -1){
587
522
perror("write");
588
523
retval = -1;
589
524
goto mandos_end;
592
527
if(written < out_size){
593
528
continue;
594
529
} else {
595
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
596
531
written = 0;
597
532
out = "\r\n";
598
533
} else {
600
535
}
601
536
}
602
537
}
603
538
604
539
if(debug){
605
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
606
541
}
607
542
608
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
609
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
610
545
do{
611
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
612
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
613
548
614
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
615
550
if(debug){
616
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
617
gnutls_perror(ret);
552
gnutls_perror (ret);
618
553
}
619
554
retval = -1;
620
555
goto mandos_end;
626
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
627
562
ip);
628
563
}
629
564
630
565
while(true){
631
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
632
567
buffer_capacity);
633
if(buffer_capacity == 0){
568
if (buffer_capacity == 0){
634
569
perror("adjustbuffer");
635
570
retval = -1;
636
571
goto mandos_end;
637
572
}
638
573
639
sret = gnutls_record_recv(session, buffer+buffer_length,
640
BUFFER_SIZE);
641
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
642
577
break;
643
578
}
644
if(sret < 0){
645
switch(sret){
579
if (ret < 0){
580
switch(ret){
646
581
case GNUTLS_E_INTERRUPTED:
647
582
case GNUTLS_E_AGAIN:
648
583
break;
649
584
case GNUTLS_E_REHANDSHAKE:
650
585
do{
651
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
652
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
653
if(ret < 0){
588
if (ret < 0){
654
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
655
gnutls_perror(ret);
590
gnutls_perror (ret);
656
591
retval = -1;
657
592
goto mandos_end;
658
593
}
661
596
fprintf(stderr, "Unknown error while reading data from"
662
597
" encrypted session with Mandos server\n");
663
598
retval = -1;
664
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
665
600
goto mandos_end;
666
601
}
667
602
} else {
668
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
669
604
}
670
605
}
671
606
673
608
fprintf(stderr, "Closing TLS session\n");
674
609
}
675
610
676
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
677
612
678
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
680
615
buffer_length,
681
&decrypted_buffer);
682
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
683
619
written = 0;
684
620
while(written < (size_t) decrypted_buffer_size){
685
ret = (int)fwrite(decrypted_buffer + written, 1,
686
(size_t)decrypted_buffer_size - written,
687
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
688
624
if(ret == 0 and ferror(stdout)){
689
625
if(debug){
690
626
fprintf(stderr, "Error writing encrypted data: %s\n",
707
643
708
644
mandos_end:
709
645
free(buffer);
710
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
711
if(ret == -1){
712
perror("close");
713
}
714
gnutls_deinit(session);
646
close(tcp_sd);
647
gnutls_deinit (session);
715
648
return retval;
716
649
}
717
650
735
668
/* Called whenever a service has been resolved successfully or
736
669
timed out */
737
670
738
switch(event) {
671
switch (event) {
739
672
default:
740
673
case AVAHI_RESOLVER_FAILURE:
741
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
753
686
interface, port);
754
687
}
755
688
int ret = start_mandos_communication(ip, port, interface, mc);
756
if(ret == 0){
689
if (ret == 0){
757
690
avahi_simple_poll_quit(mc->simple_poll);
758
691
}
759
692
}
777
710
/* Called whenever a new services becomes available on the LAN or
778
711
is removed from the LAN */
779
712
780
switch(event) {
713
switch (event) {
781
714
default:
782
715
case AVAHI_BROWSER_FAILURE:
783
716
792
725
the callback function is called the Avahi server will free the
793
726
resolver for us. */
794
727
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
796
729
protocol, name, type, domain,
797
730
AVAHI_PROTO_INET6, 0,
798
731
resolve_callback, mc)))
812
745
}
813
746
}
814
747
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
759
815
760
int main(int argc, char *argv[]){
816
761
AvahiSServiceBrowser *sb = NULL;
817
762
int error;
823
768
uid_t uid;
824
769
gid_t gid;
825
770
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
827
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
831
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
777
.dh_bits = 1024, .priority = "SECURE256"};
834
778
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
836
779
837
780
{
838
781
struct argp_option options[] = {
839
782
{ .name = "debug", .key = 128,
840
783
.doc = "Debug mode", .group = 3 },
841
784
{ .name = "connect", .key = 'c',
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
844
787
.group = 1 },
845
788
{ .name = "interface", .key = 'i',
846
.arg = "NAME",
847
.doc = "Interface that will be used to search for Mandos"
848
" servers",
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
849
795
.group = 1 },
850
796
{ .name = "seckey", .key = 's',
851
.arg = "FILE",
852
.doc = "OpenPGP secret key file base name",
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
853
799
.group = 1 },
854
800
{ .name = "pubkey", .key = 'p',
855
.arg = "FILE",
856
.doc = "OpenPGP public key file base name",
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
857
803
.group = 2 },
858
804
{ .name = "dh-bits", .key = 129,
859
805
.arg = "BITS",
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
806
.doc = "dh-bits to use in gnutls communication",
862
807
.group = 2 },
863
808
{ .name = "priority", .key = 130,
864
.arg = "STRING",
865
.doc = "GnuTLS priority string for the TLS handshake",
866
.group = 1 },
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
867
811
{ .name = NULL }
868
812
};
813
869
814
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
873
case 128: /* --debug */
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
874
821
debug = true;
875
822
break;
876
case 'c': /* --connect */
823
case 'c':
877
824
connect_to = arg;
878
825
break;
879
case 'i': /* --interface */
826
case 'i':
880
827
interface = arg;
881
828
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
ret = sscanf(arg, "%u", &mc.dh_bits);
890
if(ret != 1){
891
fprintf(stderr, "Bad number of DH bits\n");
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
892
843
exit(EXIT_FAILURE);
893
844
}
894
845
break;
895
case 130: /* --priority */
846
case 130:
896
847
mc.priority = arg;
897
848
break;
898
849
case ARGP_KEY_ARG:
899
argp_usage(state);
850
argp_usage (state);
900
851
case ARGP_KEY_END:
901
852
break;
902
853
default:
904
855
}
905
856
return 0;
906
857
}
907
858
908
859
struct argp argp = { .options = options, .parser = parse_opt,
909
860
.args_doc = "",
910
861
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
914
865
fprintf(stderr, "Unknown error while parsing arguments\n");
915
866
exitcode = EXIT_FAILURE;
916
867
goto end;
917
868
}
918
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
919
893
920
894
/* If the interface is down, bring it up */
921
895
{
941
915
goto end;
942
916
}
943
917
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
918
close(sd);
948
919
}
949
920
950
921
uid = getuid();
951
922
gid = getgid();
952
923
953
924
ret = setuid(uid);
954
if(ret == -1){
925
if (ret == -1){
955
926
perror("setuid");
956
927
}
957
928
958
929
setgid(gid);
959
if(ret == -1){
930
if (ret == -1){
960
931
perror("setgid");
961
932
}
962
933
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if(ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
986
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
935
if(if_index == 0){
988
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
946
exitcode = EXIT_FAILURE;
999
947
goto end;
1000
948
}
1001
uint16_t port;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1003
if(ret != 1){
1004
fprintf(stderr, "Bad port number\n");
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
1005
953
exitcode = EXIT_FAILURE;
1006
954
goto end;
1007
955
}
1016
964
goto end;
1017
965
}
1018
966
1019
if(not debug){
967
if (not debug){
1020
968
avahi_set_log_function(empty_log);
1021
969
}
1022
970
1025
973
1026
974
/* Allocate main Avahi loop object */
1027
975
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL) {
976
if (mc.simple_poll == NULL) {
1029
977
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
978
" object.\n");
1031
979
exitcode = EXIT_FAILURE;
1032
980
goto end;
1033
981
}
1034
982
1035
983
{
1036
984
AvahiServerConfig config;
1037
985
/* Do not publish any local Zeroconf records */
1040
988
config.publish_addresses = 0;
1041
989
config.publish_workstation = 0;
1042
990
config.publish_domain = 0;
1043
991
1044
992
/* Allocate a new server */
1045
993
mc.server = avahi_server_new(avahi_simple_poll_get
1046
994
(mc.simple_poll), &config, NULL,
1047
995
NULL, &error);
1048
996
1049
997
/* Free the Avahi configuration data */
1050
998
avahi_server_config_free(&config);
1051
999
}
1052
1000
1053
1001
/* Check if creating the Avahi server object succeeded */
1054
if(mc.server == NULL) {
1002
if (mc.server == NULL) {
1055
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
1004
avahi_strerror(error));
1057
1005
exitcode = EXIT_FAILURE;
1063
1011
AVAHI_PROTO_INET6,
1064
1012
"_mandos._tcp", NULL, 0,
1065
1013
browse_callback, &mc);
1066
if(sb == NULL) {
1014
if (sb == NULL) {
1067
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1068
1016
avahi_strerror(avahi_server_errno(mc.server)));
1069
1017
exitcode = EXIT_FAILURE;
1071
1019
}
1072
1020
1073
1021
/* Run the main loop */
1074
1075
if(debug){
1022
1023
if (debug){
1076
1024
fprintf(stderr, "Starting Avahi loop search\n");
1077
1025
}
1078
1026
1079
1027
avahi_simple_poll_loop(mc.simple_poll);
1080
1028
1081
1029
end:
1082
1083
if(debug){
1030
1031
if (debug){
1084
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1085
1033
}
1086
1034
1087
1035
/* Cleanup things */
1088
if(sb != NULL)
1036
if (sb != NULL)
1089
1037
avahi_s_service_browser_free(sb);
1090
1038
1091
if(mc.server != NULL)
1039
if (mc.server != NULL)
1092
1040
avahi_server_free(mc.server);
1093
1094
if(mc.simple_poll != NULL)
1041
1042
if (mc.simple_poll != NULL)
1095
1043
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if(gnutls_initalized){
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1098
1048
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
if(errno != ENOENT){
1114
perror("opendir");
1115
}
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if(direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1 and errno != ENOENT){
1142
perror("rmdir");
1143
}
1144
}
1145
1049
gnutls_global_deinit ();
1050
}
1051
1146
1052
return exitcode;
1147
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0