To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-request.c
- browse files at revision 24.1.55
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.55
- Committer: Björn Påhlsson
- Date: 2008-08-16 20:31:21 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816203121-u3uavdi14y1xjj0b
updated some partial manual pages
- files added:
- network-protocol.txt
- 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, intmax_t, SCNdMAX */
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){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
309
217
goto decrypt_end;
310
218
}
311
219
313
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
222
}
315
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
316
253
/* 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");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
319
256
plaintext_length = -1;
320
257
goto decrypt_end;
321
258
}
325
262
plaintext_capacity = adjustbuffer(plaintext,
326
263
(size_t)plaintext_length,
327
264
plaintext_capacity);
328
if(plaintext_capacity == 0){
265
if (plaintext_capacity == 0){
329
266
perror("adjustbuffer");
330
267
plaintext_length = -1;
331
268
goto decrypt_end;
334
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
272
BUFFER_SIZE);
336
273
/* Print the data, if any */
337
if(ret == 0){
274
if (ret == 0){
338
275
/* EOF */
339
276
break;
340
277
}
345
282
}
346
283
plaintext_length += ret;
347
284
}
348
285
349
286
if(debug){
350
287
fprintf(stderr, "Decrypted password is: ");
351
288
for(ssize_t i = 0; i < plaintext_length; i++){
364
301
return plaintext_length;
365
302
}
366
303
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)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
371
307
ret = "(unknown)";
372
308
return ret;
373
309
}
388
324
}
389
325
390
326
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
394
330
return -1;
395
331
}
396
332
397
if(debug){
333
if (debug){
398
334
/* "Use a log level over 10 to enable all debugging options."
399
335
* - GnuTLS manual
400
336
*/
404
340
405
341
/* OpenPGP credentials */
406
342
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();
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
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
449
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
450
383
451
384
return 0;
452
385
453
386
globalfail:
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;
391
459
392
}
460
393
461
394
static int init_gnutls_session(mandos_context *mc,
463
396
int ret;
464
397
/* GnuTLS session creation */
465
398
ret = gnutls_init(session, GNUTLS_SERVER);
466
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
467
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
401
safer_gnutls_strerror(ret));
469
402
}
471
404
{
472
405
const char *err;
473
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
407
if (ret != GNUTLS_E_SUCCESS) {
475
408
fprintf(stderr, "Syntax error at: %s\n", err);
476
409
fprintf(stderr, "GnuTLS error: %s\n",
477
410
safer_gnutls_strerror(ret));
478
gnutls_deinit(*session);
411
gnutls_deinit (*session);
479
412
return -1;
480
413
}
481
414
}
482
415
483
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
417
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
418
if (ret != GNUTLS_E_SUCCESS) {
486
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
420
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
421
gnutls_deinit (*session);
489
422
return -1;
490
423
}
491
424
492
425
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
495
428
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
430
498
431
return 0;
499
432
}
507
440
AvahiIfIndex if_index,
508
441
mandos_context *mc){
509
442
int ret, tcp_sd;
510
ssize_t sret;
511
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
512
444
char *buffer = NULL;
513
445
char *decrypted_buffer;
519
451
char interface[IF_NAMESIZE];
520
452
gnutls_session_t session;
521
453
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
524
456
return -1;
525
457
}
526
458
534
466
perror("socket");
535
467
return -1;
536
468
}
537
469
538
470
if(debug){
539
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
472
perror("if_indextoname");
543
475
fprintf(stderr, "Binding to interface %s\n", interface);
544
476
}
545
477
546
memset(&to, 0, sizeof(to));
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
547
479
to.in6.sin6_family = AF_INET6;
548
480
/* It would be nice to have a way to detect if we were passed an
549
481
IPv4 address here. Now we assume an IPv6 address. */
550
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
551
if(ret < 0 ){
483
if (ret < 0 ){
552
484
perror("inet_pton");
553
485
return -1;
554
486
}
556
488
fprintf(stderr, "Bad address: %s\n", ip);
557
489
return -1;
558
490
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
491
to.in6.sin6_port = htons(port); /* Spurious warning */
562
492
563
493
to.in6.sin6_scope_id = (uint32_t)if_index;
564
494
577
507
}
578
508
579
509
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
510
if (ret < 0){
581
511
perror("connect");
582
512
return -1;
583
513
}
584
514
585
515
const char *out = mandos_protocol_version;
586
516
written = 0;
587
while(true){
517
while (true){
588
518
size_t out_size = strlen(out);
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
520
out_size - written));
591
if(ret == -1){
521
if (ret == -1){
592
522
perror("write");
593
523
retval = -1;
594
524
goto mandos_end;
597
527
if(written < out_size){
598
528
continue;
599
529
} else {
600
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
601
531
written = 0;
602
532
out = "\r\n";
603
533
} else {
605
535
}
606
536
}
607
537
}
608
538
609
539
if(debug){
610
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
541
}
612
542
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
615
545
do{
616
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
617
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
548
619
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
620
550
if(debug){
621
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
gnutls_perror(ret);
552
gnutls_perror (ret);
623
553
}
624
554
retval = -1;
625
555
goto mandos_end;
631
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
562
ip);
633
563
}
634
564
635
565
while(true){
636
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
567
buffer_capacity);
638
if(buffer_capacity == 0){
568
if (buffer_capacity == 0){
639
569
perror("adjustbuffer");
640
570
retval = -1;
641
571
goto mandos_end;
642
572
}
643
573
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
647
577
break;
648
578
}
649
if(sret < 0){
650
switch(sret){
579
if (ret < 0){
580
switch(ret){
651
581
case GNUTLS_E_INTERRUPTED:
652
582
case GNUTLS_E_AGAIN:
653
583
break;
654
584
case GNUTLS_E_REHANDSHAKE:
655
585
do{
656
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
657
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
if(ret < 0){
588
if (ret < 0){
659
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
gnutls_perror(ret);
590
gnutls_perror (ret);
661
591
retval = -1;
662
592
goto mandos_end;
663
593
}
666
596
fprintf(stderr, "Unknown error while reading data from"
667
597
" encrypted session with Mandos server\n");
668
598
retval = -1;
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
600
goto mandos_end;
671
601
}
672
602
} else {
673
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
674
604
}
675
605
}
676
606
678
608
fprintf(stderr, "Closing TLS session\n");
679
609
}
680
610
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
612
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
615
buffer_length,
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
688
619
written = 0;
689
620
while(written < (size_t) decrypted_buffer_size){
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
693
624
if(ret == 0 and ferror(stdout)){
694
625
if(debug){
695
626
fprintf(stderr, "Error writing encrypted data: %s\n",
704
635
} else {
705
636
retval = -1;
706
637
}
707
} else {
708
retval = -1;
709
638
}
710
639
711
640
/* Shutdown procedure */
712
641
713
642
mandos_end:
714
643
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
644
close(tcp_sd);
645
gnutls_deinit (session);
720
646
return retval;
721
647
}
722
648
735
661
flags,
736
662
void* userdata) {
737
663
mandos_context *mc = userdata;
738
assert(r);
664
assert(r); /* Spurious warning */
739
665
740
666
/* Called whenever a service has been resolved successfully or
741
667
timed out */
742
668
743
switch(event) {
669
switch (event) {
744
670
default:
745
671
case AVAHI_RESOLVER_FAILURE:
746
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
754
680
avahi_address_snprint(ip, sizeof(ip), address);
755
681
if(debug){
756
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
759
685
}
760
686
int ret = start_mandos_communication(ip, port, interface, mc);
761
if(ret == 0){
687
if (ret == 0){
762
688
avahi_simple_poll_quit(mc->simple_poll);
763
689
}
764
690
}
777
703
flags,
778
704
void* userdata) {
779
705
mandos_context *mc = userdata;
780
assert(b);
706
assert(b); /* Spurious warning */
781
707
782
708
/* Called whenever a new services becomes available on the LAN or
783
709
is removed from the LAN */
784
710
785
switch(event) {
711
switch (event) {
786
712
default:
787
713
case AVAHI_BROWSER_FAILURE:
788
714
797
723
the callback function is called the Avahi server will free the
798
724
resolver for us. */
799
725
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
727
protocol, name, type, domain,
802
728
AVAHI_PROTO_INET6, 0,
803
729
resolve_callback, mc)))
817
743
}
818
744
}
819
745
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
755
}
756
757
820
758
int main(int argc, char *argv[]){
821
759
AvahiSServiceBrowser *sb = NULL;
822
760
int error;
823
761
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
762
int exitcode = EXIT_SUCCESS;
827
763
const char *interface = "eth0";
828
764
struct ifreq network;
830
766
uid_t uid;
831
767
gid_t gid;
832
768
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
838
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
775
.dh_bits = 1024, .priority = "SECURE256"};
841
776
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
777
844
778
{
845
779
struct argp_option options[] = {
846
780
{ .name = "debug", .key = 128,
847
781
.doc = "Debug mode", .group = 3 },
848
782
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
851
785
.group = 1 },
852
786
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
856
793
.group = 1 },
857
794
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
860
797
.group = 1 },
861
798
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
864
801
.group = 2 },
865
802
{ .name = "dh-bits", .key = 129,
866
803
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
804
.doc = "dh-bits to use in gnutls communication",
869
805
.group = 2 },
870
806
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
874
809
{ .name = NULL }
875
810
};
811
876
812
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
881
819
debug = true;
882
820
break;
883
case 'c': /* --connect */
821
case 'c':
884
822
connect_to = arg;
885
823
break;
886
case 'i': /* --interface */
824
case 'i':
887
825
interface = arg;
888
826
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
900
841
exit(EXIT_FAILURE);
901
842
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
843
break;
904
case 130: /* --priority */
844
case 130:
905
845
mc.priority = arg;
906
846
break;
907
847
case ARGP_KEY_ARG:
908
argp_usage(state);
848
argp_usage (state);
909
849
case ARGP_KEY_END:
910
850
break;
911
851
default:
913
853
}
914
854
return 0;
915
855
}
916
856
917
857
struct argp argp = { .options = options, .parser = parse_opt,
918
858
.args_doc = "",
919
859
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
923
863
fprintf(stderr, "Unknown error while parsing arguments\n");
924
864
exitcode = EXIT_FAILURE;
925
865
goto end;
926
866
}
927
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
928
891
929
892
/* If the interface is down, bring it up */
930
893
{
934
897
exitcode = EXIT_FAILURE;
935
898
goto end;
936
899
}
937
strcpy(network.ifr_name, interface);
900
strcpy(network.ifr_name, interface); /* Spurious warning */
938
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
902
if(ret == -1){
940
903
perror("ioctl SIOCGIFFLAGS");
950
913
goto end;
951
914
}
952
915
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
916
close(sd);
957
917
}
958
918
959
919
uid = getuid();
960
920
gid = getgid();
961
921
962
922
ret = setuid(uid);
963
if(ret == -1){
923
if (ret == -1){
964
924
perror("setuid");
965
925
}
966
926
967
927
setgid(gid);
968
if(ret == -1){
928
if (ret == -1){
969
929
perror("setgid");
970
930
}
971
931
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
995
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
933
if(if_index == 0){
997
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1007
944
exitcode = EXIT_FAILURE;
1008
945
goto end;
1009
946
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
1015
951
exitcode = EXIT_FAILURE;
1016
952
goto end;
1017
953
}
1018
port = (uint16_t)tmpmax;
1019
954
*address = '\0';
1020
955
address = connect_to;
1021
956
ret = start_mandos_communication(address, port, if_index, &mc);
1027
962
goto end;
1028
963
}
1029
964
1030
if(not debug){
965
if (not debug){
1031
966
avahi_set_log_function(empty_log);
1032
967
}
1033
968
1036
971
1037
972
/* Allocate main Avahi loop object */
1038
973
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
974
if (mc.simple_poll == NULL) {
1040
975
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
976
" object.\n");
1042
977
exitcode = EXIT_FAILURE;
1043
978
goto end;
1044
979
}
1045
980
1046
981
{
1047
982
AvahiServerConfig config;
1048
983
/* Do not publish any local Zeroconf records */
1051
986
config.publish_addresses = 0;
1052
987
config.publish_workstation = 0;
1053
988
config.publish_domain = 0;
1054
989
1055
990
/* Allocate a new server */
1056
991
mc.server = avahi_server_new(avahi_simple_poll_get
1057
992
(mc.simple_poll), &config, NULL,
1058
993
NULL, &error);
1059
994
1060
995
/* Free the Avahi configuration data */
1061
996
avahi_server_config_free(&config);
1062
997
}
1063
998
1064
999
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1000
if (mc.server == NULL) {
1066
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
1002
avahi_strerror(error));
1068
1003
exitcode = EXIT_FAILURE;
1074
1009
AVAHI_PROTO_INET6,
1075
1010
"_mandos._tcp", NULL, 0,
1076
1011
browse_callback, &mc);
1077
if(sb == NULL) {
1012
if (sb == NULL) {
1078
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1079
1014
avahi_strerror(avahi_server_errno(mc.server)));
1080
1015
exitcode = EXIT_FAILURE;
1082
1017
}
1083
1018
1084
1019
/* Run the main loop */
1085
1086
if(debug){
1020
1021
if (debug){
1087
1022
fprintf(stderr, "Starting Avahi loop search\n");
1088
1023
}
1089
1024
1090
1025
avahi_simple_poll_loop(mc.simple_poll);
1091
1026
1092
1027
end:
1093
1094
if(debug){
1028
1029
if (debug){
1095
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1096
1031
}
1097
1032
1098
1033
/* Cleanup things */
1099
if(sb != NULL)
1034
if (sb != NULL)
1100
1035
avahi_s_service_browser_free(sb);
1101
1036
1102
if(mc.server != NULL)
1037
if (mc.server != NULL)
1103
1038
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1039
1040
if (mc.simple_poll != NULL)
1106
1041
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1109
1046
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1047
gnutls_global_deinit ();
1048
}
1049
1157
1050
return exitcode;
1158
1051
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0