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 24.1.38
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.38
- Committer: Björn Påhlsson
- Date: 2008-08-10 01:10:04 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 59.
- Revision ID: belorn@braxen-20080810011004-4ngszt5wxu3opctk
changed description to better fit role
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
36
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
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,
43
42
srand() */
44
43
#include <stdbool.h> /* bool, true */
45
44
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
45
strerror(), memcpy(), strcpy() */
47
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
48
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
50
sockaddr_in6, PF_INET6,
50
51
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
52
uid_t, gid_t */
54
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
54
struct in6_addr, inet_pton(),
56
55
connect() */
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
*/
60
#include <inttypes.h> /* PRIu16, SCNu16 */
61
56
#include <assert.h> /* assert() */
62
57
#include <errno.h> /* perror(), errno */
63
58
#include <time.h> /* time() */
64
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
60
SIOCSIFFLAGS, if_indextoname(),
66
61
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
63
getuid(), getgid(), setuid(),
70
64
setgid() */
65
#include <netinet/in.h>
71
66
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
67
#include <iso646.h> /* not, and */
73
68
#include <argp.h> /* struct argp_option, error_t, struct
74
69
argp_state, struct argp,
75
70
argp_parse(), ARGP_KEY_ARG,
87
82
#include <avahi-common/error.h>
88
83
89
84
/* GnuTLS */
90
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
91
functions:
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
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 */
100
#include <gpgme.h> /* All GPGME types, constants and
101
functions:
93
#include <gpgme.h> /* All GPGME types, constants and functions
102
94
gpgme_*
103
95
GPGME_PROTOCOL_OpenPGP,
104
96
GPG_ERR_NO_* */
105
97
106
98
#define BUFFER_SIZE 256
107
99
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
112
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
113
102
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client " VERSION;
103
const char *argp_program_version = "password-request 1.0";
115
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
105
117
106
/* Used for passing in values through the Avahi callback functions */
122
111
unsigned int dh_bits;
123
112
gnutls_dh_params_t dh_params;
124
113
const char *priority;
125
gpgme_ctx_t ctx;
126
114
} mandos_context;
127
115
128
116
/*
132
120
*/
133
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
122
size_t buffer_capacity){
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
125
if (buffer == NULL){
138
126
return 0;
139
127
}
140
128
buffer_capacity += BUFFER_SIZE;
143
131
}
144
132
145
133
/*
146
* Initialize GPGME.
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
147
136
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
gpgme_ctx_t ctx;
151
143
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
152
147
gpgme_engine_info_t engine_info;
153
148
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");
149
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
151
}
193
152
194
153
/* Init GPGME */
195
154
gpgme_check_version(NULL);
196
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
156
if (rc != GPG_ERR_NO_ERROR){
198
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
158
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
159
return -1;
201
160
}
202
161
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){
162
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
206
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
166
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
167
return -1;
209
168
}
210
169
while(engine_info != NULL){
211
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
214
173
break;
215
174
}
216
175
engine_info = engine_info->next;
217
176
}
218
177
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");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
return -1;
254
180
}
255
181
256
182
/* Create new GPGME data buffer from memory cryptotext */
257
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
184
0);
259
if(rc != GPG_ERR_NO_ERROR){
185
if (rc != GPG_ERR_NO_ERROR){
260
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
187
gpgme_strsource(rc), gpgme_strerror(rc));
262
188
return -1;
264
190
265
191
/* Create new empty GPGME data buffer for the plaintext */
266
192
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
268
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
195
gpgme_strsource(rc), gpgme_strerror(rc));
270
196
gpgme_data_release(dh_crypto);
271
197
return -1;
272
198
}
273
199
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
274
209
/* Decrypt data from the cryptotext data buffer to the plaintext
275
210
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
278
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
214
gpgme_strsource(rc), gpgme_strerror(rc));
280
215
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
216
goto decrypt_end;
310
217
}
311
218
313
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
221
}
315
222
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
239
while(recipient != NULL){
240
fprintf(stderr, "Public key algorithm: %s\n",
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
242
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
243
fprintf(stderr, "Secret key available: %s\n",
244
recipient->status == GPG_ERR_NO_SECKEY
245
? "No" : "Yes");
246
recipient = recipient->next;
247
}
248
}
249
}
250
}
251
316
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
319
255
plaintext_length = -1;
320
256
goto decrypt_end;
321
257
}
325
261
plaintext_capacity = adjustbuffer(plaintext,
326
262
(size_t)plaintext_length,
327
263
plaintext_capacity);
328
if(plaintext_capacity == 0){
264
if (plaintext_capacity == 0){
329
265
perror("adjustbuffer");
330
266
plaintext_length = -1;
331
267
goto decrypt_end;
334
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
271
BUFFER_SIZE);
336
272
/* Print the data, if any */
337
if(ret == 0){
273
if (ret == 0){
338
274
/* EOF */
339
275
break;
340
276
}
345
281
}
346
282
plaintext_length += ret;
347
283
}
348
284
349
285
if(debug){
350
286
fprintf(stderr, "Decrypted password is: ");
351
287
for(ssize_t i = 0; i < plaintext_length; i++){
364
300
return plaintext_length;
365
301
}
366
302
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
-Wunreachable-code */
370
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
371
306
ret = "(unknown)";
372
307
return ret;
373
308
}
379
314
}
380
315
381
316
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
317
const char *pubkeyfile,
318
const char *seckeyfile){
384
319
int ret;
385
320
386
321
if(debug){
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",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
414
346
return -1;
415
347
}
416
348
417
349
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
421
353
}
422
354
423
355
ret = gnutls_certificate_set_openpgp_key_file
424
(mc->cred, pubkeyfilename, seckeyfilename,
425
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
427
358
fprintf(stderr,
428
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
431
362
safer_gnutls_strerror(ret));
432
363
goto globalfail;
433
364
}
434
365
435
366
/* GnuTLS server initialization */
436
367
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));
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
440
371
goto globalfail;
441
372
}
442
373
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));
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
446
377
goto globalfail;
447
378
}
448
379
449
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
450
381
451
382
return 0;
452
383
453
384
globalfail:
454
385
455
386
gnutls_certificate_free_credentials(mc->cred);
456
387
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
458
388
return -1;
389
459
390
}
460
391
461
392
static int init_gnutls_session(mandos_context *mc,
463
394
int ret;
464
395
/* GnuTLS session creation */
465
396
ret = gnutls_init(session, GNUTLS_SERVER);
466
if(ret != GNUTLS_E_SUCCESS){
397
if (ret != GNUTLS_E_SUCCESS){
467
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
399
safer_gnutls_strerror(ret));
469
400
}
471
402
{
472
403
const char *err;
473
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
405
if (ret != GNUTLS_E_SUCCESS) {
475
406
fprintf(stderr, "Syntax error at: %s\n", err);
476
407
fprintf(stderr, "GnuTLS error: %s\n",
477
408
safer_gnutls_strerror(ret));
478
gnutls_deinit(*session);
409
gnutls_deinit (*session);
479
410
return -1;
480
411
}
481
412
}
482
413
483
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
415
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
416
if (ret != GNUTLS_E_SUCCESS) {
486
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
418
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
419
gnutls_deinit (*session);
489
420
return -1;
490
421
}
491
422
492
423
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
495
426
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
428
498
429
return 0;
499
430
}
507
438
AvahiIfIndex if_index,
508
439
mandos_context *mc){
509
440
int ret, tcp_sd;
510
ssize_t sret;
511
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
512
442
char *buffer = NULL;
513
443
char *decrypted_buffer;
519
449
char interface[IF_NAMESIZE];
520
450
gnutls_session_t session;
521
451
522
ret = init_gnutls_session(mc, &session);
523
if(ret != 0){
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
524
454
return -1;
525
455
}
526
456
527
457
if(debug){
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
529
"\n", ip, port);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
530
460
}
531
461
532
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
464
perror("socket");
535
465
return -1;
536
466
}
537
467
538
468
if(debug){
539
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
470
perror("if_indextoname");
543
473
fprintf(stderr, "Binding to interface %s\n", interface);
544
474
}
545
475
546
memset(&to, 0, sizeof(to));
476
memset(&to,0,sizeof(to)); /* Spurious warning */
547
477
to.in6.sin6_family = AF_INET6;
548
478
/* It would be nice to have a way to detect if we were passed an
549
479
IPv4 address here. Now we assume an IPv6 address. */
550
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
551
if(ret < 0 ){
481
if (ret < 0 ){
552
482
perror("inet_pton");
553
483
return -1;
554
484
}
556
486
fprintf(stderr, "Bad address: %s\n", ip);
557
487
return -1;
558
488
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
562
490
563
491
to.in6.sin6_scope_id = (uint32_t)if_index;
564
492
565
493
if(debug){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
568
495
char addrstr[INET6_ADDRSTRLEN] = "";
569
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
497
sizeof(addrstr)) == NULL){
577
504
}
578
505
579
506
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
507
if (ret < 0){
581
508
perror("connect");
582
509
return -1;
583
510
}
584
511
585
512
const char *out = mandos_protocol_version;
586
513
written = 0;
587
while(true){
514
while (true){
588
515
size_t out_size = strlen(out);
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
517
out_size - written));
591
if(ret == -1){
518
if (ret == -1){
592
519
perror("write");
593
520
retval = -1;
594
521
goto mandos_end;
597
524
if(written < out_size){
598
525
continue;
599
526
} else {
600
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
601
528
written = 0;
602
529
out = "\r\n";
603
530
} else {
605
532
}
606
533
}
607
534
}
608
535
609
536
if(debug){
610
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
538
}
612
539
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
615
542
do{
616
ret = gnutls_handshake(session);
543
ret = gnutls_handshake (session);
617
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
545
619
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
620
547
if(debug){
621
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
gnutls_perror(ret);
549
gnutls_perror (ret);
623
550
}
624
551
retval = -1;
625
552
goto mandos_end;
631
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
559
ip);
633
560
}
634
561
635
562
while(true){
636
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
564
buffer_capacity);
638
if(buffer_capacity == 0){
565
if (buffer_capacity == 0){
639
566
perror("adjustbuffer");
640
567
retval = -1;
641
568
goto mandos_end;
642
569
}
643
570
644
sret = gnutls_record_recv(session, buffer+buffer_length,
645
BUFFER_SIZE);
646
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
647
574
break;
648
575
}
649
if(sret < 0){
650
switch(sret){
576
if (ret < 0){
577
switch(ret){
651
578
case GNUTLS_E_INTERRUPTED:
652
579
case GNUTLS_E_AGAIN:
653
580
break;
654
581
case GNUTLS_E_REHANDSHAKE:
655
582
do{
656
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
657
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
if(ret < 0){
585
if (ret < 0){
659
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
gnutls_perror(ret);
587
gnutls_perror (ret);
661
588
retval = -1;
662
589
goto mandos_end;
663
590
}
666
593
fprintf(stderr, "Unknown error while reading data from"
667
594
" encrypted session with Mandos server\n");
668
595
retval = -1;
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
597
goto mandos_end;
671
598
}
672
599
} else {
673
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
674
601
}
675
602
}
676
603
678
605
fprintf(stderr, "Closing TLS session\n");
679
606
}
680
607
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
609
683
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
612
buffer_length,
686
&decrypted_buffer);
687
if(decrypted_buffer_size >= 0){
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
688
616
written = 0;
689
617
while(written < (size_t) decrypted_buffer_size){
690
ret = (int)fwrite(decrypted_buffer + written, 1,
691
(size_t)decrypted_buffer_size - written,
692
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
693
621
if(ret == 0 and ferror(stdout)){
694
622
if(debug){
695
623
fprintf(stderr, "Error writing encrypted data: %s\n",
704
632
} else {
705
633
retval = -1;
706
634
}
707
} else {
708
retval = -1;
709
635
}
710
636
711
637
/* Shutdown procedure */
712
638
713
639
mandos_end:
714
640
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
718
}
719
gnutls_deinit(session);
641
close(tcp_sd);
642
gnutls_deinit (session);
720
643
return retval;
721
644
}
722
645
735
658
flags,
736
659
void* userdata) {
737
660
mandos_context *mc = userdata;
738
assert(r);
661
assert(r); /* Spurious warning */
739
662
740
663
/* Called whenever a service has been resolved successfully or
741
664
timed out */
742
665
743
switch(event) {
666
switch (event) {
744
667
default:
745
668
case AVAHI_RESOLVER_FAILURE:
746
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
753
676
char ip[AVAHI_ADDRESS_STR_MAX];
754
677
avahi_address_snprint(ip, sizeof(ip), address);
755
678
if(debug){
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIu16 ") on port %d\n", name, host_name, ip,
758
interface, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
759
681
}
760
682
int ret = start_mandos_communication(ip, port, interface, mc);
761
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
763
685
}
764
686
}
765
687
}
777
699
flags,
778
700
void* userdata) {
779
701
mandos_context *mc = userdata;
780
assert(b);
702
assert(b); /* Spurious warning */
781
703
782
704
/* Called whenever a new services becomes available on the LAN or
783
705
is removed from the LAN */
784
706
785
switch(event) {
707
switch (event) {
786
708
default:
787
709
case AVAHI_BROWSER_FAILURE:
788
710
797
719
the callback function is called the Avahi server will free the
798
720
resolver for us. */
799
721
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
723
protocol, name, type, domain,
802
724
AVAHI_PROTO_INET6, 0,
803
725
resolve_callback, mc)))
817
739
}
818
740
}
819
741
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
760
}
761
762
820
763
int main(int argc, char *argv[]){
821
764
AvahiSServiceBrowser *sb = NULL;
822
765
int error;
828
771
uid_t uid;
829
772
gid_t gid;
830
773
char *connect_to = NULL;
831
char tempdir[] = "/tmp/mandosXXXXXX";
832
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
833
const char *seckey = PATHDIR "/" SECKEY;
834
const char *pubkey = PATHDIR "/" PUBKEY;
835
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
836
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
837
.dh_bits = 1024, .priority = "SECURE256"
838
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
.dh_bits = 1024, .priority = "SECURE256"};
839
779
bool gnutls_initalized = false;
840
bool gpgme_initalized = false;
841
780
842
781
{
843
782
struct argp_option options[] = {
844
783
{ .name = "debug", .key = 128,
845
784
.doc = "Debug mode", .group = 3 },
846
785
{ .name = "connect", .key = 'c',
847
.arg = "ADDRESS:PORT",
848
.doc = "Connect directly to a specific Mandos server",
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
849
788
.group = 1 },
850
789
{ .name = "interface", .key = 'i',
851
.arg = "NAME",
852
.doc = "Interface that will be used to search for Mandos"
853
" servers",
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
854
796
.group = 1 },
855
797
{ .name = "seckey", .key = 's',
856
.arg = "FILE",
857
.doc = "OpenPGP secret key file base name",
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
858
800
.group = 1 },
859
801
{ .name = "pubkey", .key = 'p',
860
.arg = "FILE",
861
.doc = "OpenPGP public key file base name",
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
862
804
.group = 2 },
863
805
{ .name = "dh-bits", .key = 129,
864
806
.arg = "BITS",
865
.doc = "Bit length of the prime number used in the"
866
" Diffie-Hellman key exchange",
807
.doc = "dh-bits to use in gnutls communication",
867
808
.group = 2 },
868
809
{ .name = "priority", .key = 130,
869
.arg = "STRING",
870
.doc = "GnuTLS priority string for the TLS handshake",
871
.group = 1 },
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
872
812
{ .name = NULL }
873
813
};
814
874
815
875
error_t parse_opt(int key, char *arg,
876
struct argp_state *state) {
877
switch(key) {
878
case 128: /* --debug */
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
879
822
debug = true;
880
823
break;
881
case 'c': /* --connect */
824
case 'c':
882
825
connect_to = arg;
883
826
break;
884
case 'i': /* --interface */
827
case 'i':
885
828
interface = arg;
886
829
break;
887
case 's': /* --seckey */
888
seckey = arg;
889
break;
890
case 'p': /* --pubkey */
891
pubkey = arg;
892
break;
893
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");
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
897
844
exit(EXIT_FAILURE);
898
845
}
899
846
break;
900
case 130: /* --priority */
847
case 130:
901
848
mc.priority = arg;
902
849
break;
903
850
case ARGP_KEY_ARG:
904
argp_usage(state);
905
case ARGP_KEY_END:
851
argp_usage (state);
906
852
break;
853
case ARGP_KEY_END:
854
break;
907
855
default:
908
856
return ARGP_ERR_UNKNOWN;
909
857
}
910
858
return 0;
911
859
}
912
860
913
861
struct argp argp = { .options = options, .parser = parse_opt,
914
862
.args_doc = "",
915
863
.doc = "Mandos client -- Get and decrypt"
916
" passwords from a Mandos server" };
917
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
918
if(ret == ARGP_ERR_UNKNOWN){
919
fprintf(stderr, "Unknown error while parsing arguments\n");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
}
924
925
/* If the interface is down, bring it up */
926
{
927
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
928
if(sd < 0) {
929
perror("socket");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
strcpy(network.ifr_name, interface);
934
ret = ioctl(sd, SIOCGIFFLAGS, &network);
935
if(ret == -1){
936
perror("ioctl SIOCGIFFLAGS");
937
exitcode = EXIT_FAILURE;
938
goto end;
939
}
940
if((network.ifr_flags & IFF_UP) == 0){
941
network.ifr_flags |= IFF_UP;
942
ret = ioctl(sd, SIOCSIFFLAGS, &network);
943
if(ret == -1){
944
perror("ioctl SIOCSIFFLAGS");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
}
949
ret = (int)TEMP_FAILURE_RETRY(close(sd));
950
if(ret == -1){
951
perror("close");
952
}
953
}
954
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
955
894
uid = getuid();
956
895
gid = getgid();
957
896
958
897
ret = setuid(uid);
959
if(ret == -1){
898
if (ret == -1){
960
899
perror("setuid");
961
900
}
962
901
963
902
setgid(gid);
964
if(ret == -1){
903
if (ret == -1){
965
904
perror("setgid");
966
905
}
967
906
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
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
992
908
if(if_index == 0){
993
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1003
919
exitcode = EXIT_FAILURE;
1004
920
goto end;
1005
921
}
1006
uint16_t port;
1007
ret = sscanf(address+1, "%" SCNu16, &port);
1008
if(ret != 1){
1009
fprintf(stderr, "Bad port number\n");
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
1010
926
exitcode = EXIT_FAILURE;
1011
927
goto end;
1012
928
}
1021
937
goto end;
1022
938
}
1023
939
1024
if(not debug){
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
950
if(ret == -1){
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
}
964
close(sd);
965
}
966
967
if (not debug){
1025
968
avahi_set_log_function(empty_log);
1026
969
}
1027
970
1030
973
1031
974
/* Allocate main Avahi loop object */
1032
975
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL) {
976
if (mc.simple_poll == NULL) {
1034
977
fprintf(stderr, "Avahi: Failed to create simple poll"
1035
978
" object.\n");
1036
979
exitcode = EXIT_FAILURE;
1037
980
goto end;
1038
981
}
1039
982
1040
983
{
1041
984
AvahiServerConfig config;
1042
985
/* Do not publish any local Zeroconf records */
1045
988
config.publish_addresses = 0;
1046
989
config.publish_workstation = 0;
1047
990
config.publish_domain = 0;
1048
991
1049
992
/* Allocate a new server */
1050
993
mc.server = avahi_server_new(avahi_simple_poll_get
1051
994
(mc.simple_poll), &config, NULL,
1052
995
NULL, &error);
1053
996
1054
997
/* Free the Avahi configuration data */
1055
998
avahi_server_config_free(&config);
1056
999
}
1057
1000
1058
1001
/* Check if creating the Avahi server object succeeded */
1059
if(mc.server == NULL) {
1002
if (mc.server == NULL) {
1060
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1061
1004
avahi_strerror(error));
1062
1005
exitcode = EXIT_FAILURE;
1068
1011
AVAHI_PROTO_INET6,
1069
1012
"_mandos._tcp", NULL, 0,
1070
1013
browse_callback, &mc);
1071
if(sb == NULL) {
1014
if (sb == NULL) {
1072
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1073
1016
avahi_strerror(avahi_server_errno(mc.server)));
1074
1017
exitcode = EXIT_FAILURE;
1076
1019
}
1077
1020
1078
1021
/* Run the main loop */
1079
1080
if(debug){
1022
1023
if (debug){
1081
1024
fprintf(stderr, "Starting Avahi loop search\n");
1082
1025
}
1083
1026
1084
1027
avahi_simple_poll_loop(mc.simple_poll);
1085
1028
1086
1029
end:
1087
1088
if(debug){
1030
1031
if (debug){
1089
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1090
1033
}
1091
1034
1092
1035
/* Cleanup things */
1093
if(sb != NULL)
1036
if (sb != NULL)
1094
1037
avahi_s_service_browser_free(sb);
1095
1038
1096
if(mc.server != NULL)
1039
if (mc.server != NULL)
1097
1040
avahi_server_free(mc.server);
1098
1099
if(mc.simple_poll != NULL)
1041
1042
if (mc.simple_poll != NULL)
1100
1043
avahi_simple_poll_free(mc.simple_poll);
1101
1102
if(gnutls_initalized){
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1103
1048
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
1049
gnutls_global_deinit ();
1050
}
1051
1151
1052
return exitcode;
1152
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0