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- Committer: Teddy Hogeborn
- Date: 2008-09-03 05:12:45 UTC
- Revision ID: teddy@fukt.bsnet.se-20080903051245-yy85uyiqfhlctubr
* plugins.d/password-request.xml (DESCRIPTION): Improved wording.
- 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:
- .bzrignore
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
}
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 from
369
-Wunreachable-code */
370
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)
371
306
ret = "(unknown)";
372
307
return ret;
373
308
}
388
323
}
389
324
390
325
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
394
329
return -1;
395
330
}
396
331
397
if(debug){
332
if (debug){
398
333
/* "Use a log level over 10 to enable all debugging options."
399
334
* - GnuTLS manual
400
335
*/
404
339
405
340
/* OpenPGP credentials */
406
341
gnutls_certificate_allocate_credentials(&mc->cred);
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
412
safer_gnutls_strerror(ret));
413
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 ();
414
347
return -1;
415
348
}
416
349
417
350
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" 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,
420
353
seckeyfilename);
421
354
}
422
355
423
356
ret = gnutls_certificate_set_openpgp_key_file
424
357
(mc->cred, pubkeyfilename, seckeyfilename,
425
358
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
359
if (ret != GNUTLS_E_SUCCESS) {
427
360
fprintf(stderr,
428
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
431
364
safer_gnutls_strerror(ret));
432
365
goto globalfail;
433
366
}
434
367
435
368
/* GnuTLS server initialization */
436
369
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %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));
440
373
goto globalfail;
441
374
}
442
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
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));
446
379
goto globalfail;
447
380
}
448
381
454
387
455
388
gnutls_certificate_free_credentials(mc->cred);
456
389
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
458
390
return -1;
459
391
}
460
392
463
395
int ret;
464
396
/* GnuTLS session creation */
465
397
ret = gnutls_init(session, GNUTLS_SERVER);
466
if(ret != GNUTLS_E_SUCCESS){
398
if (ret != GNUTLS_E_SUCCESS){
467
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
400
safer_gnutls_strerror(ret));
469
401
}
471
403
{
472
404
const char *err;
473
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
406
if (ret != GNUTLS_E_SUCCESS) {
475
407
fprintf(stderr, "Syntax error at: %s\n", err);
476
408
fprintf(stderr, "GnuTLS error: %s\n",
477
409
safer_gnutls_strerror(ret));
478
gnutls_deinit(*session);
410
gnutls_deinit (*session);
479
411
return -1;
480
412
}
481
413
}
482
414
483
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
416
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
417
if (ret != GNUTLS_E_SUCCESS) {
486
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
419
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
420
gnutls_deinit (*session);
489
421
return -1;
490
422
}
491
423
492
424
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
495
427
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
429
498
430
return 0;
499
431
}
507
439
AvahiIfIndex if_index,
508
440
mandos_context *mc){
509
441
int ret, tcp_sd;
510
ssize_t sret;
511
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
512
443
char *buffer = NULL;
513
444
char *decrypted_buffer;
519
450
char interface[IF_NAMESIZE];
520
451
gnutls_session_t session;
521
452
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
524
455
return -1;
525
456
}
526
457
548
479
/* It would be nice to have a way to detect if we were passed an
549
480
IPv4 address here. Now we assume an IPv6 address. */
550
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
551
if(ret < 0 ){
482
if (ret < 0 ){
552
483
perror("inet_pton");
553
484
return -1;
554
485
}
556
487
fprintf(stderr, "Bad address: %s\n", ip);
557
488
return -1;
558
489
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
490
to.in6.sin6_port = htons(port); /* Spurious warning */
562
491
563
492
to.in6.sin6_scope_id = (uint32_t)if_index;
564
493
577
506
}
578
507
579
508
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
509
if (ret < 0){
581
510
perror("connect");
582
511
return -1;
583
512
}
584
513
585
514
const char *out = mandos_protocol_version;
586
515
written = 0;
587
while(true){
516
while (true){
588
517
size_t out_size = strlen(out);
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
519
out_size - written));
591
if(ret == -1){
520
if (ret == -1){
592
521
perror("write");
593
522
retval = -1;
594
523
goto mandos_end;
597
526
if(written < out_size){
598
527
continue;
599
528
} else {
600
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
601
530
written = 0;
602
531
out = "\r\n";
603
532
} else {
610
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
540
}
612
541
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
614
543
615
544
do{
616
ret = gnutls_handshake(session);
545
ret = gnutls_handshake (session);
617
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
547
619
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
620
549
if(debug){
621
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
gnutls_perror(ret);
551
gnutls_perror (ret);
623
552
}
624
553
retval = -1;
625
554
goto mandos_end;
635
564
while(true){
636
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
566
buffer_capacity);
638
if(buffer_capacity == 0){
567
if (buffer_capacity == 0){
639
568
perror("adjustbuffer");
640
569
retval = -1;
641
570
goto mandos_end;
642
571
}
643
572
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
647
576
break;
648
577
}
649
if(sret < 0){
650
switch(sret){
578
if (ret < 0){
579
switch(ret){
651
580
case GNUTLS_E_INTERRUPTED:
652
581
case GNUTLS_E_AGAIN:
653
582
break;
654
583
case GNUTLS_E_REHANDSHAKE:
655
584
do{
656
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
657
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
if(ret < 0){
587
if (ret < 0){
659
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
gnutls_perror(ret);
589
gnutls_perror (ret);
661
590
retval = -1;
662
591
goto mandos_end;
663
592
}
666
595
fprintf(stderr, "Unknown error while reading data from"
667
596
" encrypted session with Mandos server\n");
668
597
retval = -1;
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
599
goto mandos_end;
671
600
}
672
601
} else {
673
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
674
603
}
675
604
}
676
605
678
607
fprintf(stderr, "Closing TLS session\n");
679
608
}
680
609
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
611
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
614
buffer_length,
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
688
618
written = 0;
689
619
while(written < (size_t) decrypted_buffer_size){
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
693
623
if(ret == 0 and ferror(stdout)){
694
624
if(debug){
695
625
fprintf(stderr, "Error writing encrypted data: %s\n",
712
642
713
643
mandos_end:
714
644
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
645
close(tcp_sd);
646
gnutls_deinit (session);
720
647
return retval;
721
648
}
722
649
740
667
/* Called whenever a service has been resolved successfully or
741
668
timed out */
742
669
743
switch(event) {
670
switch (event) {
744
671
default:
745
672
case AVAHI_RESOLVER_FAILURE:
746
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
758
685
interface, port);
759
686
}
760
687
int ret = start_mandos_communication(ip, port, interface, mc);
761
if(ret == 0){
688
if (ret == 0){
762
689
avahi_simple_poll_quit(mc->simple_poll);
763
690
}
764
691
}
782
709
/* Called whenever a new services becomes available on the LAN or
783
710
is removed from the LAN */
784
711
785
switch(event) {
712
switch (event) {
786
713
default:
787
714
case AVAHI_BROWSER_FAILURE:
788
715
797
724
the callback function is called the Avahi server will free the
798
725
resolver for us. */
799
726
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
728
protocol, name, type, domain,
802
729
AVAHI_PROTO_INET6, 0,
803
730
resolve_callback, mc)))
817
744
}
818
745
}
819
746
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
820
759
int main(int argc, char *argv[]){
821
760
AvahiSServiceBrowser *sb = NULL;
822
761
int error;
828
767
uid_t uid;
829
768
gid_t gid;
830
769
char *connect_to = NULL;
831
char tempdir[] = "/tmp/mandosXXXXXX";
832
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
833
const char *seckey = PATHDIR "/" SECKEY;
834
const char *pubkey = PATHDIR "/" PUBKEY;
835
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
836
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
837
776
.dh_bits = 1024, .priority = "SECURE256"
838
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
839
778
bool gnutls_initalized = false;
840
bool gpgme_initalized = false;
841
779
842
780
{
843
781
struct argp_option options[] = {
852
790
.doc = "Interface that will be used to search for Mandos"
853
791
" servers",
854
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
855
797
{ .name = "seckey", .key = 's',
856
798
.arg = "FILE",
857
799
.doc = "OpenPGP secret key file base name",
872
814
{ .name = NULL }
873
815
};
874
816
875
error_t parse_opt(int key, char *arg,
876
struct argp_state *state) {
877
switch(key) {
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) {
878
822
case 128: /* --debug */
879
823
debug = true;
880
824
break;
884
828
case 'i': /* --interface */
885
829
interface = arg;
886
830
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
887
834
case 's': /* --seckey */
888
seckey = arg;
835
seckeyname = arg;
889
836
break;
890
837
case 'p': /* --pubkey */
891
pubkey = arg;
838
pubkeyname = arg;
892
839
break;
893
840
case 129: /* --dh-bits */
894
ret = sscanf(arg, "%u", &mc.dh_bits);
895
if(ret != 1){
896
fprintf(stderr, "Bad number of DH bits\n");
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
897
845
exit(EXIT_FAILURE);
898
846
}
899
847
break;
901
849
mc.priority = arg;
902
850
break;
903
851
case ARGP_KEY_ARG:
904
argp_usage(state);
852
argp_usage (state);
905
853
case ARGP_KEY_END:
906
854
break;
907
855
default:
914
862
.args_doc = "",
915
863
.doc = "Mandos client -- Get and decrypt"
916
864
" passwords from a Mandos server" };
917
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
918
if(ret == ARGP_ERR_UNKNOWN){
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
919
867
fprintf(stderr, "Unknown error while parsing arguments\n");
920
868
exitcode = EXIT_FAILURE;
921
869
goto end;
922
870
}
923
871
}
924
872
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
925
896
/* If the interface is down, bring it up */
926
897
{
927
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
917
goto end;
947
918
}
948
919
}
949
ret = (int)TEMP_FAILURE_RETRY(close(sd));
950
if(ret == -1){
951
perror("close");
952
}
920
close(sd);
953
921
}
954
922
955
923
uid = getuid();
956
924
gid = getgid();
957
925
958
926
ret = setuid(uid);
959
if(ret == -1){
927
if (ret == -1){
960
928
perror("setuid");
961
929
}
962
930
963
931
setgid(gid);
964
if(ret == -1){
932
if (ret == -1){
965
933
perror("setgid");
966
934
}
967
935
968
ret = init_gnutls_global(&mc, pubkey, seckey);
969
if(ret == -1){
970
fprintf(stderr, "init_gnutls_global failed\n");
971
exitcode = EXIT_FAILURE;
972
goto end;
973
} else {
974
gnutls_initalized = true;
975
}
976
977
if(mkdtemp(tempdir) == NULL){
978
perror("mkdtemp");
979
tempdir[0] = '\0';
980
goto end;
981
}
982
983
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
984
fprintf(stderr, "gpgme_initalized failed\n");
985
exitcode = EXIT_FAILURE;
986
goto end;
987
} else {
988
gpgme_initalized = true;
989
}
990
991
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
992
937
if(if_index == 0){
993
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1003
948
exitcode = EXIT_FAILURE;
1004
949
goto end;
1005
950
}
1006
uint16_t port;
1007
ret = sscanf(address+1, "%" SCNu16, &port);
1008
if(ret != 1){
1009
fprintf(stderr, "Bad port number\n");
951
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
1010
955
exitcode = EXIT_FAILURE;
1011
956
goto end;
1012
957
}
1021
966
goto end;
1022
967
}
1023
968
1024
if(not debug){
969
if (not debug){
1025
970
avahi_set_log_function(empty_log);
1026
971
}
1027
972
1030
975
1031
976
/* Allocate main Avahi loop object */
1032
977
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL) {
978
if (mc.simple_poll == NULL) {
1034
979
fprintf(stderr, "Avahi: Failed to create simple poll"
1035
980
" object.\n");
1036
981
exitcode = EXIT_FAILURE;
1056
1001
}
1057
1002
1058
1003
/* Check if creating the Avahi server object succeeded */
1059
if(mc.server == NULL) {
1004
if (mc.server == NULL) {
1060
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1061
1006
avahi_strerror(error));
1062
1007
exitcode = EXIT_FAILURE;
1068
1013
AVAHI_PROTO_INET6,
1069
1014
"_mandos._tcp", NULL, 0,
1070
1015
browse_callback, &mc);
1071
if(sb == NULL) {
1016
if (sb == NULL) {
1072
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1073
1018
avahi_strerror(avahi_server_errno(mc.server)));
1074
1019
exitcode = EXIT_FAILURE;
1077
1022
1078
1023
/* Run the main loop */
1079
1024
1080
if(debug){
1025
if (debug){
1081
1026
fprintf(stderr, "Starting Avahi loop search\n");
1082
1027
}
1083
1028
1085
1030
1086
1031
end:
1087
1032
1088
if(debug){
1033
if (debug){
1089
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1090
1035
}
1091
1036
1092
1037
/* Cleanup things */
1093
if(sb != NULL)
1038
if (sb != NULL)
1094
1039
avahi_s_service_browser_free(sb);
1095
1040
1096
if(mc.server != NULL)
1041
if (mc.server != NULL)
1097
1042
avahi_server_free(mc.server);
1098
1043
1099
if(mc.simple_poll != NULL)
1044
if (mc.simple_poll != NULL)
1100
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1101
1048
1102
if(gnutls_initalized){
1049
if (gnutls_initalized){
1103
1050
gnutls_certificate_free_credentials(mc.cred);
1104
gnutls_global_deinit();
1105
gnutls_dh_params_deinit(mc.dh_params);
1106
}
1107
1108
if(gpgme_initalized){
1109
gpgme_release(mc.ctx);
1110
}
1111
1112
/* Removes the temp directory used by GPGME */
1113
if(tempdir[0] != '\0'){
1114
DIR *d;
1115
struct dirent *direntry;
1116
d = opendir(tempdir);
1117
if(d == NULL){
1118
if(errno != ENOENT){
1119
perror("opendir");
1120
}
1121
} else {
1122
while(true){
1123
direntry = readdir(d);
1124
if(direntry == NULL){
1125
break;
1126
}
1127
if(direntry->d_type == DT_REG){
1128
char *fullname = NULL;
1129
ret = asprintf(&fullname, "%s/%s", tempdir,
1130
direntry->d_name);
1131
if(ret < 0){
1132
perror("asprintf");
1133
continue;
1134
}
1135
ret = unlink(fullname);
1136
if(ret == -1){
1137
fprintf(stderr, "unlink(\"%s\"): %s",
1138
fullname, strerror(errno));
1139
}
1140
free(fullname);
1141
}
1142
}
1143
closedir(d);
1144
}
1145
ret = rmdir(tempdir);
1146
if(ret == -1 and errno != ENOENT){
1147
perror("rmdir");
1148
}
1149
}
1150
1051
gnutls_global_deinit ();
1052
}
1053
1151
1054
return exitcode;
1152
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0