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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
stdout, ferror(), sscanf */
39
40
#include <stdint.h> /* uint16_t, uint32_t */
40
41
#include <stddef.h> /* NULL, size_t, ssize_t */
41
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
49
sockaddr_in6, PF_INET6,
49
50
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
52
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
55
struct in6_addr, inet_pton(),
54
56
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, SCNu16 */
55
61
#include <assert.h> /* assert() */
56
62
#include <errno.h> /* perror(), errno */
57
63
#include <time.h> /* time() */
58
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
65
SIOCSIFFLAGS, if_indextoname(),
60
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
61
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
69
getuid(), getgid(), setuid(),
63
70
setgid() */
64
#include <netinet/in.h>
65
71
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
72
#include <iso646.h> /* not, and, or */
67
73
#include <argp.h> /* struct argp_option, error_t, struct
68
74
argp_state, struct argp,
69
75
argp_parse(), ARGP_KEY_ARG,
86
92
gnutls_*
87
93
init_gnutls_session(),
88
94
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
95
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
90
97
GNUTLS_OPENPGP_FMT_BASE64 */
91
98
92
99
/* GPGME */
98
105
99
106
#define BUFFER_SIZE 256
100
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
101
112
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
113
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
114
const char *argp_program_version = "mandos-client " VERSION;
105
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
116
107
117
/* Used for passing in values through the Avahi callback functions */
112
122
unsigned int dh_bits;
113
123
gnutls_dh_params_t dh_params;
114
124
const char *priority;
125
gpgme_ctx_t ctx;
115
126
} mandos_context;
116
127
117
128
/*
121
132
*/
122
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
134
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
137
if(buffer == NULL){
127
138
return 0;
128
139
}
129
140
buffer_capacity += BUFFER_SIZE;
132
143
}
133
144
134
145
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
146
* Initialize GPGME.
137
147
*/
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;
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
144
151
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
152
gpgme_engine_info_t engine_info;
149
153
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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");
152
192
}
153
193
154
194
/* Init GPGME */
155
195
gpgme_check_version(NULL);
156
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
197
if(rc != GPG_ERR_NO_ERROR){
158
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
199
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
200
return false;
161
201
}
162
202
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){
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){
166
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
207
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
208
return false;
169
209
}
170
210
while(engine_info != NULL){
171
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
174
214
break;
175
215
}
176
216
engine_info = engine_info->next;
177
217
}
178
218
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
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");
181
254
}
182
255
183
256
/* Create new GPGME data buffer from memory cryptotext */
184
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
258
0);
186
if (rc != GPG_ERR_NO_ERROR){
259
if(rc != GPG_ERR_NO_ERROR){
187
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
261
gpgme_strsource(rc), gpgme_strerror(rc));
189
262
return -1;
191
264
192
265
/* Create new empty GPGME data buffer for the plaintext */
193
266
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
267
if(rc != GPG_ERR_NO_ERROR){
195
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
269
gpgme_strsource(rc), gpgme_strerror(rc));
197
270
gpgme_data_release(dh_crypto);
198
271
return -1;
199
272
}
200
273
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
210
274
/* Decrypt data from the cryptotext data buffer to the plaintext
211
275
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
214
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
279
gpgme_strsource(rc), gpgme_strerror(rc));
216
280
plaintext_length = -1;
217
if (debug){
281
if(debug){
218
282
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
221
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
222
286
} else {
223
287
fprintf(stderr, "Unsupported algorithm: %s\n",
250
314
}
251
315
252
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
255
319
plaintext_length = -1;
256
320
goto decrypt_end;
257
321
}
261
325
plaintext_capacity = adjustbuffer(plaintext,
262
326
(size_t)plaintext_length,
263
327
plaintext_capacity);
264
if (plaintext_capacity == 0){
328
if(plaintext_capacity == 0){
265
329
perror("adjustbuffer");
266
330
plaintext_length = -1;
267
331
goto decrypt_end;
270
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
335
BUFFER_SIZE);
272
336
/* Print the data, if any */
273
if (ret == 0){
337
if(ret == 0){
274
338
/* EOF */
275
339
break;
276
340
}
300
364
return plaintext_length;
301
365
}
302
366
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning */
369
if(ret == NULL)
306
370
ret = "(unknown)";
307
371
return ret;
308
372
}
323
387
}
324
388
325
389
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
390
if(ret != GNUTLS_E_SUCCESS) {
391
fprintf(stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
329
393
return -1;
330
394
}
331
395
332
if (debug){
396
if(debug){
333
397
/* "Use a log level over 10 to enable all debugging options."
334
398
* - GnuTLS manual
335
399
*/
339
403
340
404
/* OpenPGP credentials */
341
405
gnutls_certificate_allocate_credentials(&mc->cred);
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 ();
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();
347
411
return -1;
348
412
}
349
413
350
414
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
417
seckeyfilename);
354
418
}
355
419
356
420
ret = gnutls_certificate_set_openpgp_key_file
357
421
(mc->cred, pubkeyfilename, seckeyfilename,
358
422
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
423
if(ret != GNUTLS_E_SUCCESS) {
360
424
fprintf(stderr,
361
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
427
fprintf(stderr, "The GnuTLS error is: %s\n",
364
428
safer_gnutls_strerror(ret));
365
429
goto globalfail;
366
430
}
367
431
368
432
/* GnuTLS server initialization */
369
433
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
373
437
goto globalfail;
374
438
}
375
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
379
443
goto globalfail;
380
444
}
381
445
387
451
388
452
gnutls_certificate_free_credentials(mc->cred);
389
453
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
390
455
return -1;
391
456
}
392
457
395
460
int ret;
396
461
/* GnuTLS session creation */
397
462
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
463
if(ret != GNUTLS_E_SUCCESS){
399
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
465
safer_gnutls_strerror(ret));
401
466
}
403
468
{
404
469
const char *err;
405
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
471
if(ret != GNUTLS_E_SUCCESS) {
407
472
fprintf(stderr, "Syntax error at: %s\n", err);
408
473
fprintf(stderr, "GnuTLS error: %s\n",
409
474
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
475
gnutls_deinit(*session);
411
476
return -1;
412
477
}
413
478
}
414
479
415
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
481
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
482
if(ret != GNUTLS_E_SUCCESS) {
418
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
484
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
485
gnutls_deinit(*session);
421
486
return -1;
422
487
}
423
488
424
489
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
427
492
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
494
430
495
return 0;
431
496
}
439
504
AvahiIfIndex if_index,
440
505
mandos_context *mc){
441
506
int ret, tcp_sd;
507
ssize_t sret;
442
508
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
443
509
char *buffer = NULL;
444
510
char *decrypted_buffer;
450
516
char interface[IF_NAMESIZE];
451
517
gnutls_session_t session;
452
518
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
519
ret = init_gnutls_session(mc, &session);
520
if(ret != 0){
455
521
return -1;
456
522
}
457
523
479
545
/* It would be nice to have a way to detect if we were passed an
480
546
IPv4 address here. Now we assume an IPv6 address. */
481
547
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
548
if(ret < 0 ){
483
549
perror("inet_pton");
484
550
return -1;
485
551
}
506
572
}
507
573
508
574
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
575
if(ret < 0){
510
576
perror("connect");
511
577
return -1;
512
578
}
513
579
514
580
const char *out = mandos_protocol_version;
515
581
written = 0;
516
while (true){
582
while(true){
517
583
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
585
out_size - written));
520
if (ret == -1){
586
if(ret == -1){
521
587
perror("write");
522
588
retval = -1;
523
589
goto mandos_end;
526
592
if(written < out_size){
527
593
continue;
528
594
} else {
529
if (out == mandos_protocol_version){
595
if(out == mandos_protocol_version){
530
596
written = 0;
531
597
out = "\r\n";
532
598
} else {
539
605
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
606
}
541
607
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
543
609
544
610
do{
545
ret = gnutls_handshake (session);
611
ret = gnutls_handshake(session);
546
612
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
547
613
548
if (ret != GNUTLS_E_SUCCESS){
614
if(ret != GNUTLS_E_SUCCESS){
549
615
if(debug){
550
616
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
617
gnutls_perror(ret);
552
618
}
553
619
retval = -1;
554
620
goto mandos_end;
564
630
while(true){
565
631
buffer_capacity = adjustbuffer(&buffer, buffer_length,
566
632
buffer_capacity);
567
if (buffer_capacity == 0){
633
if(buffer_capacity == 0){
568
634
perror("adjustbuffer");
569
635
retval = -1;
570
636
goto mandos_end;
571
637
}
572
638
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
639
sret = gnutls_record_recv(session, buffer+buffer_length,
640
BUFFER_SIZE);
641
if(sret == 0){
576
642
break;
577
643
}
578
if (ret < 0){
579
switch(ret){
644
if(sret < 0){
645
switch(sret){
580
646
case GNUTLS_E_INTERRUPTED:
581
647
case GNUTLS_E_AGAIN:
582
648
break;
583
649
case GNUTLS_E_REHANDSHAKE:
584
650
do{
585
ret = gnutls_handshake (session);
651
ret = gnutls_handshake(session);
586
652
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
587
if (ret < 0){
653
if(ret < 0){
588
654
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
655
gnutls_perror(ret);
590
656
retval = -1;
591
657
goto mandos_end;
592
658
}
595
661
fprintf(stderr, "Unknown error while reading data from"
596
662
" encrypted session with Mandos server\n");
597
663
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
664
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
665
goto mandos_end;
600
666
}
601
667
} else {
602
buffer_length += (size_t) ret;
668
buffer_length += (size_t) sret;
603
669
}
604
670
}
605
671
607
673
fprintf(stderr, "Closing TLS session\n");
608
674
}
609
675
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
677
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
680
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
681
&decrypted_buffer);
682
if(decrypted_buffer_size >= 0){
618
683
written = 0;
619
684
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
685
ret = (int)fwrite(decrypted_buffer + written, 1,
686
(size_t)decrypted_buffer_size - written,
687
stdout);
623
688
if(ret == 0 and ferror(stdout)){
624
689
if(debug){
625
690
fprintf(stderr, "Error writing encrypted data: %s\n",
642
707
643
708
mandos_end:
644
709
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
710
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
711
if(ret == -1){
712
perror("close");
713
}
714
gnutls_deinit(session);
647
715
return retval;
648
716
}
649
717
667
735
/* Called whenever a service has been resolved successfully or
668
736
timed out */
669
737
670
switch (event) {
738
switch(event) {
671
739
default:
672
740
case AVAHI_RESOLVER_FAILURE:
673
741
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
685
753
interface, port);
686
754
}
687
755
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
756
if(ret == 0){
689
757
avahi_simple_poll_quit(mc->simple_poll);
690
758
}
691
759
}
709
777
/* Called whenever a new services becomes available on the LAN or
710
778
is removed from the LAN */
711
779
712
switch (event) {
780
switch(event) {
713
781
default:
714
782
case AVAHI_BROWSER_FAILURE:
715
783
724
792
the callback function is called the Avahi server will free the
725
793
resolver for us. */
726
794
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
728
796
protocol, name, type, domain,
729
797
AVAHI_PROTO_INET6, 0,
730
798
resolve_callback, mc)))
744
812
}
745
813
}
746
814
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
756
}
757
758
759
815
int main(int argc, char *argv[]){
760
816
AvahiSServiceBrowser *sb = NULL;
761
817
int error;
767
823
uid_t uid;
768
824
gid_t gid;
769
825
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
770
827
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
775
831
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
832
.dh_bits = 1024, .priority = "SECURE256"
777
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
834
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
779
836
780
837
{
781
838
struct argp_option options[] = {
790
847
.doc = "Interface that will be used to search for Mandos"
791
848
" servers",
792
849
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
797
850
{ .name = "seckey", .key = 's',
798
851
.arg = "FILE",
799
852
.doc = "OpenPGP secret key file base name",
814
867
{ .name = NULL }
815
868
};
816
869
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
822
873
case 128: /* --debug */
823
874
debug = true;
824
875
break;
828
879
case 'i': /* --interface */
829
880
interface = arg;
830
881
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
834
882
case 's': /* --seckey */
835
seckeyname = arg;
883
seckey = arg;
836
884
break;
837
885
case 'p': /* --pubkey */
838
pubkeyname = arg;
886
pubkey = arg;
839
887
break;
840
888
case 129: /* --dh-bits */
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
889
ret = sscanf(arg, "%u", &mc.dh_bits);
890
if(ret != 1){
891
fprintf(stderr, "Bad number of DH bits\n");
845
892
exit(EXIT_FAILURE);
846
893
}
847
894
break;
849
896
mc.priority = arg;
850
897
break;
851
898
case ARGP_KEY_ARG:
852
argp_usage (state);
899
argp_usage(state);
853
900
case ARGP_KEY_END:
854
901
break;
855
902
default:
862
909
.args_doc = "",
863
910
.doc = "Mandos client -- Get and decrypt"
864
911
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
867
914
fprintf(stderr, "Unknown error while parsing arguments\n");
868
915
exitcode = EXIT_FAILURE;
869
916
goto end;
870
917
}
871
918
}
872
919
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
920
/* If the interface is down, bring it up */
897
921
{
898
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
917
941
goto end;
918
942
}
919
943
}
920
close(sd);
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
921
948
}
922
949
923
950
uid = getuid();
924
951
gid = getgid();
925
952
926
953
ret = setuid(uid);
927
if (ret == -1){
954
if(ret == -1){
928
955
perror("setuid");
929
956
}
930
957
931
958
setgid(gid);
932
if (ret == -1){
959
if(ret == -1){
933
960
perror("setgid");
934
961
}
935
962
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
936
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
987
if(if_index == 0){
938
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
948
998
exitcode = EXIT_FAILURE;
949
999
goto end;
950
1000
}
951
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
1001
uint16_t port;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1003
if(ret != 1){
1004
fprintf(stderr, "Bad port number\n");
955
1005
exitcode = EXIT_FAILURE;
956
1006
goto end;
957
1007
}
966
1016
goto end;
967
1017
}
968
1018
969
if (not debug){
1019
if(not debug){
970
1020
avahi_set_log_function(empty_log);
971
1021
}
972
1022
975
1025
976
1026
/* Allocate main Avahi loop object */
977
1027
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
1028
if(mc.simple_poll == NULL) {
979
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
980
1030
" object.\n");
981
1031
exitcode = EXIT_FAILURE;
1001
1051
}
1002
1052
1003
1053
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1054
if(mc.server == NULL) {
1005
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
1056
avahi_strerror(error));
1007
1057
exitcode = EXIT_FAILURE;
1013
1063
AVAHI_PROTO_INET6,
1014
1064
"_mandos._tcp", NULL, 0,
1015
1065
browse_callback, &mc);
1016
if (sb == NULL) {
1066
if(sb == NULL) {
1017
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1018
1068
avahi_strerror(avahi_server_errno(mc.server)));
1019
1069
exitcode = EXIT_FAILURE;
1022
1072
1023
1073
/* Run the main loop */
1024
1074
1025
if (debug){
1075
if(debug){
1026
1076
fprintf(stderr, "Starting Avahi loop search\n");
1027
1077
}
1028
1078
1030
1080
1031
1081
end:
1032
1082
1033
if (debug){
1083
if(debug){
1034
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1035
1085
}
1036
1086
1037
1087
/* Cleanup things */
1038
if (sb != NULL)
1088
if(sb != NULL)
1039
1089
avahi_s_service_browser_free(sb);
1040
1090
1041
if (mc.server != NULL)
1091
if(mc.server != NULL)
1042
1092
avahi_server_free(mc.server);
1043
1093
1044
if (mc.simple_poll != NULL)
1094
if(mc.simple_poll != NULL)
1045
1095
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1048
1096
1049
if (gnutls_initalized){
1097
if(gnutls_initalized){
1050
1098
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
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
1054
1146
return exitcode;
1055
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0