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- Committer: Björn Påhlsson
- Date: 2008-08-03 17:24:47 UTC
- mfrom: (40 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 41.
- Revision ID: belorn@braxen-20080803172447-uma248p1s4cbsp02
merge +
mandosclient
Added a adjustbuffer function.
mandosclient
Added a adjustbuffer function.
- files added:
- server.conf
- files removed:
- plugins.d/Makefile
- files renamed:
- mandos-clients.conf => clients.conf
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
/* $Id$ */
2
3
/* PLEASE NOTE *
4
* This file demonstrates how to use Avahi's core API, this is
5
* the embeddable mDNS stack for embedded applications.
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
6
4
*
7
* End user applications should *not* use this API and should use
8
* the D-Bus or C APIs, please see
9
* client-browse-services.c and glib-integration.c
10
*
11
* I repeat, you probably do *not* want to use this example.
5
* This program is partly derived from an example program for an Avahi
6
* service browser, downloaded from
7
* <http://avahi.org/browser/examples/core-browse-services.c>. This
8
* includes the following functions: "resolve_callback",
9
* "browse_callback", and parts of "main".
10
*
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
*
14
* This program is free software: you can redistribute it and/or
15
* modify it under the terms of the GNU General Public License as
16
* published by the Free Software Foundation, either version 3 of the
17
* License, or (at your option) any later version.
18
*
19
* This program is distributed in the hope that it will be useful, but
20
* WITHOUT ANY WARRANTY; without even the implied warranty of
21
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22
* General Public License for more details.
23
*
24
* You should have received a copy of the GNU General Public License
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
27
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
12
29
*/
13
30
14
/***
15
This file is part of avahi.
16
17
avahi is free software; you can redistribute it and/or modify it
18
under the terms of the GNU Lesser General Public License as
19
published by the Free Software Foundation; either version 2.1 of the
20
License, or (at your option) any later version.
21
22
avahi is distributed in the hope that it will be useful, but WITHOUT
23
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
25
Public License for more details.
26
27
You should have received a copy of the GNU Lesser General Public
28
License along with avahi; if not, write to the Free Software
29
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30
USA.
31
***/
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
36
37
#include <stdio.h>
37
38
#include <assert.h>
38
39
#include <stdlib.h>
39
40
#include <time.h>
40
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
41
46
42
47
#include <avahi-core/core.h>
43
48
#include <avahi-core/lookup.h>
46
51
#include <avahi-common/malloc.h>
47
52
#include <avahi-common/error.h>
48
53
49
//mandos client part
50
#include <sys/types.h> /* socket(), setsockopt(), inet_pton() */
51
#include <sys/socket.h> /* socket(), setsockopt(), struct sockaddr_in6, struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* ALL GNUTLS STUFF */
53
#include <gnutls/openpgp.h> /* gnutls with openpgp stuff */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
54
60
55
61
#include <unistd.h> /* close() */
56
62
#include <netinet/in.h>
58
64
#include <string.h> /* memset */
59
65
#include <arpa/inet.h> /* inet_pton() */
60
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
61
68
62
// gpgme
69
/* GPGME */
63
70
#include <errno.h> /* perror() */
64
71
#include <gpgme.h>
65
72
73
/* getopt_long */
74
#include <getopt.h>
66
75
67
#ifndef CERT_ROOT
68
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
69
#endif
70
#define CERTFILE CERT_ROOT "openpgp-client.txt"
71
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
72
76
#define BUFFER_SIZE 256
73
#define DH_BITS 1024
74
77
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
81
82
bool debug = false;
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
75
87
typedef struct {
76
gnutls_session_t session;
88
AvahiSimplePoll *simple_poll;
89
AvahiServer *server;
77
90
gnutls_certificate_credentials_t cred;
78
gnutls_dh_params_t dh_params;
79
} encrypted_session;
80
81
82
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
91
unsigned int dh_bits;
92
const char *priority;
93
} mandos_context;
94
95
size_t adjustbuffer(char **buffer, size_t buffer_length,
96
size_t buffer_capacity){
97
if (buffer_length + BUFFER_SIZE > buffer_capacity){
98
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
99
if (buffer == NULL){
100
return 0;
101
}
102
buffer_capacity += BUFFER_SIZE;
103
}
104
return buffer_capacity;
105
}
106
107
/*
108
* Decrypt OpenPGP data using keyrings in HOMEDIR.
109
* Returns -1 on error
110
*/
111
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
size_t crypto_size,
113
char **plaintext,
114
const char *homedir){
83
115
gpgme_data_t dh_crypto, dh_plain;
84
116
gpgme_ctx_t ctx;
85
117
gpgme_error_t rc;
86
118
ssize_t ret;
87
size_t new_packet_capacity = 0;
88
size_t new_packet_length = 0;
119
size_t plaintext_capacity = 0;
120
ssize_t plaintext_length = 0;
89
121
gpgme_engine_info_t engine_info;
90
122
123
if (debug){
124
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
125
}
126
91
127
/* Init GPGME */
92
128
gpgme_check_version(NULL);
93
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
129
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
130
if (rc != GPG_ERR_NO_ERROR){
131
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
132
gpgme_strsource(rc), gpgme_strerror(rc));
133
return -1;
134
}
94
135
95
/* Set GPGME home directory */
136
/* Set GPGME home directory for the OpenPGP engine only */
96
137
rc = gpgme_get_engine_info (&engine_info);
97
138
if (rc != GPG_ERR_NO_ERROR){
98
139
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
108
149
engine_info = engine_info->next;
109
150
}
110
151
if(engine_info == NULL){
111
fprintf(stderr, "Could not set home dir to %s\n", homedir);
152
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
112
153
return -1;
113
154
}
114
155
115
/* Create new GPGME data buffer from packet buffer */
116
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
156
/* Create new GPGME data buffer from memory cryptotext */
157
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
158
0);
117
159
if (rc != GPG_ERR_NO_ERROR){
118
160
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
119
161
gpgme_strsource(rc), gpgme_strerror(rc));
125
167
if (rc != GPG_ERR_NO_ERROR){
126
168
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
127
169
gpgme_strsource(rc), gpgme_strerror(rc));
170
gpgme_data_release(dh_crypto);
128
171
return -1;
129
172
}
130
173
133
176
if (rc != GPG_ERR_NO_ERROR){
134
177
fprintf(stderr, "bad gpgme_new: %s: %s\n",
135
178
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
179
plaintext_length = -1;
180
goto decrypt_end;
137
181
}
138
182
139
/* Decrypt data from the FILE pointer to the plaintext data buffer */
183
/* Decrypt data from the cryptotext data buffer to the plaintext
184
data buffer */
140
185
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
141
186
if (rc != GPG_ERR_NO_ERROR){
142
187
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
143
188
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
145
}
146
147
/* gpgme_decrypt_result_t result; */
148
/* result = gpgme_op_decrypt_result(ctx); */
149
/* fprintf(stderr, "Unsupported algorithm: %s\n", result->unsupported_algorithm); */
150
/* fprintf(stderr, "Wrong key usage: %d\n", result->wrong_key_usage); */
151
/* if(result->file_name != NULL){ */
152
/* fprintf(stderr, "File name: %s\n", result->file_name); */
153
/* } */
154
/* gpgme_recipient_t recipient; */
155
/* recipient = result->recipients; */
156
/* if(recipient){ */
157
/* while(recipient != NULL){ */
158
/* fprintf(stderr, "Public key algorithm: %s\n", */
159
/* gpgme_pubkey_algo_name(recipient->pubkey_algo)); */
160
/* fprintf(stderr, "Key ID: %s\n", recipient->keyid); */
161
/* fprintf(stderr, "Secret key available: %s\n", */
162
/* recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes"); */
163
/* recipient = recipient->next; */
164
/* } */
165
/* } */
166
167
/* Delete the GPGME FILE pointer cryptotext data buffer */
168
gpgme_data_release(dh_crypto);
189
plaintext_length = -1;
190
goto decrypt_end;
191
}
192
193
if(debug){
194
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
195
}
196
197
if (debug){
198
gpgme_decrypt_result_t result;
199
result = gpgme_op_decrypt_result(ctx);
200
if (result == NULL){
201
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
202
} else {
203
fprintf(stderr, "Unsupported algorithm: %s\n",
204
result->unsupported_algorithm);
205
fprintf(stderr, "Wrong key usage: %d\n",
206
result->wrong_key_usage);
207
if(result->file_name != NULL){
208
fprintf(stderr, "File name: %s\n", result->file_name);
209
}
210
gpgme_recipient_t recipient;
211
recipient = result->recipients;
212
if(recipient){
213
while(recipient != NULL){
214
fprintf(stderr, "Public key algorithm: %s\n",
215
gpgme_pubkey_algo_name(recipient->pubkey_algo));
216
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
217
fprintf(stderr, "Secret key available: %s\n",
218
recipient->status == GPG_ERR_NO_SECKEY
219
? "No" : "Yes");
220
recipient = recipient->next;
221
}
222
}
223
}
224
}
169
225
170
226
/* Seek back to the beginning of the GPGME plaintext data buffer */
171
gpgme_data_seek(dh_plain, 0, SEEK_SET);
172
173
*new_packet = 0;
227
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
228
perror("pgpme_data_seek");
229
plaintext_length = -1;
230
goto decrypt_end;
231
}
232
233
*plaintext = NULL;
174
234
while(true){
175
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
176
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
177
if (*new_packet == NULL){
178
perror("realloc");
179
return -1;
180
}
181
new_packet_capacity += BUFFER_SIZE;
235
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
236
plaintext_capacity);
237
if (plaintext_capacity == 0){
238
perror("adjustbuffer");
239
plaintext_length = -1;
240
goto decrypt_end;
182
241
}
183
242
184
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
243
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
244
BUFFER_SIZE);
185
245
/* Print the data, if any */
186
246
if (ret == 0){
187
/* If password is empty, then a incorrect error will be printed */
247
/* EOF */
188
248
break;
189
249
}
190
250
if(ret < 0){
191
251
perror("gpgme_data_read");
192
return -1;
252
plaintext_length = -1;
253
goto decrypt_end;
193
254
}
194
new_packet_length += ret;
255
plaintext_length += ret;
195
256
}
196
257
197
/* Delete the GPGME plaintext data buffer */
258
if(debug){
259
fprintf(stderr, "Decrypted password is: ");
260
for(ssize_t i = 0; i < plaintext_length; i++){
261
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
262
}
263
fprintf(stderr, "\n");
264
}
265
266
decrypt_end:
267
268
/* Delete the GPGME cryptotext data buffer */
269
gpgme_data_release(dh_crypto);
270
271
/* Delete the GPGME plaintext data buffer */
198
272
gpgme_data_release(dh_plain);
199
return new_packet_length;
273
return plaintext_length;
200
274
}
201
275
202
276
static const char * safer_gnutls_strerror (int value) {
206
280
return ret;
207
281
}
208
282
209
void debuggnutls(int level, const char* string){
210
fprintf(stderr, "%s", string);
283
/* GnuTLS log function callback */
284
static void debuggnutls(__attribute__((unused)) int level,
285
const char* string){
286
fprintf(stderr, "GnuTLS: %s", string);
211
287
}
212
288
213
int initgnutls(encrypted_session *es){
214
const char *err;
289
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
290
gnutls_dh_params_t *dh_params){
215
291
int ret;
216
292
293
if(debug){
294
fprintf(stderr, "Initializing GnuTLS\n");
295
}
296
217
297
if ((ret = gnutls_global_init ())
218
298
!= GNUTLS_E_SUCCESS) {
219
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
299
fprintf (stderr, "GnuTLS global_init: %s\n",
300
safer_gnutls_strerror(ret));
220
301
return -1;
221
302
}
222
223
/* Uncomment to enable full debuggin on the gnutls library */
224
/* gnutls_global_set_log_level(11); */
225
/* gnutls_global_set_log_function(debuggnutls); */
226
227
228
/* openpgp credentials */
229
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
303
304
if (debug){
305
/* "Use a log level over 10 to enable all debugging options."
306
* - GnuTLS manual
307
*/
308
gnutls_global_set_log_level(11);
309
gnutls_global_set_log_function(debuggnutls);
310
}
311
312
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
230
314
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
315
fprintf (stderr, "GnuTLS memory error: %s\n",
316
safer_gnutls_strerror(ret));
232
317
return -1;
233
318
}
234
319
320
if(debug){
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
324
}
325
235
326
ret = gnutls_certificate_set_openpgp_key_file
236
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
237
if (ret != GNUTLS_E_SUCCESS) {
238
fprintf
239
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
240
ret, CERTFILE, KEYFILE);
241
fprintf(stdout, "The Error is: %s\n",
242
safer_gnutls_strerror(ret));
243
return -1;
244
}
245
246
//Gnutls server initialization
247
if ((ret = gnutls_dh_params_init (&es->dh_params))
248
!= GNUTLS_E_SUCCESS) {
249
fprintf (stderr, "Error in dh parameter initialization: %s\n",
250
safer_gnutls_strerror(ret));
251
return -1;
252
}
253
254
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
255
!= GNUTLS_E_SUCCESS) {
256
fprintf (stderr, "Error in prime generation: %s\n",
257
safer_gnutls_strerror(ret));
258
return -1;
259
}
260
261
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
262
263
// Gnutls session creation
264
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
265
!= GNUTLS_E_SUCCESS){
266
fprintf(stderr, "Error in gnutls session initialization: %s\n",
267
safer_gnutls_strerror(ret));
268
}
269
270
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
271
!= GNUTLS_E_SUCCESS) {
272
fprintf(stderr, "Syntax error at: %s\n", err);
273
fprintf(stderr, "Gnutls error: %s\n",
274
safer_gnutls_strerror(ret));
275
return -1;
276
}
277
278
if ((ret = gnutls_credentials_set
279
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
280
!= GNUTLS_E_SUCCESS) {
281
fprintf(stderr, "Error setting a credentials set: %s\n",
282
safer_gnutls_strerror(ret));
283
return -1;
284
}
285
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
328
if (ret != GNUTLS_E_SUCCESS) {
329
fprintf(stderr,
330
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
333
safer_gnutls_strerror(ret));
334
return -1;
335
}
336
337
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(dh_params);
339
if (ret != GNUTLS_E_SUCCESS) {
340
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
" %s\n", safer_gnutls_strerror(ret));
342
return -1;
343
}
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
safer_gnutls_strerror(ret));
348
return -1;
349
}
350
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
352
353
/* GnuTLS session creation */
354
ret = gnutls_init(session, GNUTLS_SERVER);
355
if (ret != GNUTLS_E_SUCCESS){
356
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
357
safer_gnutls_strerror(ret));
358
}
359
360
{
361
const char *err;
362
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
363
if (ret != GNUTLS_E_SUCCESS) {
364
fprintf(stderr, "Syntax error at: %s\n", err);
365
fprintf(stderr, "GnuTLS error: %s\n",
366
safer_gnutls_strerror(ret));
367
return -1;
368
}
369
}
370
371
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
372
mc->cred);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
375
safer_gnutls_strerror(ret));
376
return -1;
377
}
378
286
379
/* ignore client certificate if any. */
287
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
380
gnutls_certificate_server_set_request (*session,
381
GNUTLS_CERT_IGNORE);
288
382
289
gnutls_dh_set_prime_bits (es->session, DH_BITS);
383
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
290
384
291
385
return 0;
292
386
}
293
387
294
void empty_log(AvahiLogLevel level, const char *txt){}
388
/* Avahi log function callback */
389
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
390
__attribute__((unused)) const char *txt){}
295
391
296
int start_mandos_communcation(char *ip, uint16_t port){
392
/* Called when a Mandos server is found */
393
static int start_mandos_communication(const char *ip, uint16_t port,
394
AvahiIfIndex if_index,
395
mandos_context *mc){
297
396
int ret, tcp_sd;
298
397
struct sockaddr_in6 to;
299
struct in6_addr ip_addr;
300
encrypted_session es;
301
398
char *buffer = NULL;
302
399
char *decrypted_buffer;
303
400
size_t buffer_length = 0;
304
401
size_t buffer_capacity = 0;
305
402
ssize_t decrypted_buffer_size;
403
size_t written;
306
404
int retval = 0;
307
405
char interface[IF_NAMESIZE];
406
gnutls_session_t session;
407
gnutls_dh_params_t dh_params;
408
409
ret = initgnutls (mc, &session, &dh_params);
410
if (ret != 0){
411
return -1;
412
}
413
414
if(debug){
415
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
416
ip, port);
417
}
308
418
309
419
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
310
420
if(tcp_sd < 0) {
311
421
perror("socket");
312
422
return -1;
313
423
}
314
315
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);
316
if(tcp_sd < 0) {
317
perror("setsockopt bindtodevice");
318
return -1;
424
425
if(debug){
426
if(if_indextoname((unsigned int)if_index, interface) == NULL){
427
perror("if_indextoname");
428
return -1;
429
}
430
fprintf(stderr, "Binding to interface %s\n", interface);
319
431
}
320
432
321
memset(&to,0,sizeof(to));
433
memset(&to,0,sizeof(to)); /* Spurious warning */
322
434
to.sin6_family = AF_INET6;
323
ret = inet_pton(AF_INET6, ip, &ip_addr);
435
/* It would be nice to have a way to detect if we were passed an
436
IPv4 address here. Now we assume an IPv6 address. */
437
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
324
438
if (ret < 0 ){
325
439
perror("inet_pton");
326
440
return -1;
327
}
441
}
328
442
if(ret == 0){
329
443
fprintf(stderr, "Bad address: %s\n", ip);
330
444
return -1;
331
445
}
332
to.sin6_port = htons(port);
333
to.sin6_scope_id = if_nametoindex("eth0");
446
to.sin6_port = htons(port); /* Spurious warning */
447
448
to.sin6_scope_id = (uint32_t)if_index;
449
450
if(debug){
451
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
452
char addrstr[INET6_ADDRSTRLEN] = "";
453
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
454
sizeof(addrstr)) == NULL){
455
perror("inet_ntop");
456
} else {
457
if(strcmp(addrstr, ip) != 0){
458
fprintf(stderr, "Canonical address form: %s\n", addrstr);
459
}
460
}
461
}
334
462
335
463
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
336
464
if (ret < 0){
337
465
perror("connect");
338
466
return -1;
339
467
}
340
341
ret = initgnutls (&es);
342
if (ret != 0){
343
retval = -1;
344
return -1;
345
}
346
347
348
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
349
468
350
ret = gnutls_handshake (es.session);
469
const char *out = mandos_protocol_version;
470
written = 0;
471
while (true){
472
size_t out_size = strlen(out);
473
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
474
out_size - written));
475
if (ret == -1){
476
perror("write");
477
retval = -1;
478
goto mandos_end;
479
}
480
written += (size_t)ret;
481
if(written < out_size){
482
continue;
483
} else {
484
if (out == mandos_protocol_version){
485
written = 0;
486
out = "\r\n";
487
} else {
488
break;
489
}
490
}
491
}
492
493
if(debug){
494
fprintf(stderr, "Establishing TLS session with %s\n", ip);
495
}
496
497
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
498
499
ret = gnutls_handshake (session);
351
500
352
501
if (ret != GNUTLS_E_SUCCESS){
353
fprintf(stderr, "\n*** Handshake failed ***\n");
354
gnutls_perror (ret);
502
if(debug){
503
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
504
gnutls_perror (ret);
505
}
355
506
retval = -1;
356
goto exit;
507
goto mandos_end;
508
}
509
510
/* Read OpenPGP packet that contains the wanted password */
511
512
if(debug){
513
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
514
ip);
357
515
}
358
516
359
//retrive password
360
517
while(true){
361
if (buffer_length + BUFFER_SIZE > buffer_capacity){
362
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
363
if (buffer == NULL){
364
perror("realloc");
365
goto exit;
366
}
367
buffer_capacity += BUFFER_SIZE;
518
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
519
if (buffer_capacity == 0){
520
perror("adjustbuffer");
521
retval = -1;
522
goto mandos_end;
368
523
}
369
524
370
ret = gnutls_record_recv
371
(es.session, buffer+buffer_length, BUFFER_SIZE);
525
ret = gnutls_record_recv(session, buffer+buffer_length,
526
BUFFER_SIZE);
372
527
if (ret == 0){
373
528
break;
374
529
}
378
533
case GNUTLS_E_AGAIN:
379
534
break;
380
535
case GNUTLS_E_REHANDSHAKE:
381
ret = gnutls_handshake (es.session);
536
ret = gnutls_handshake (session);
382
537
if (ret < 0){
383
fprintf(stderr, "\n*** Handshake failed ***\n");
538
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
384
539
gnutls_perror (ret);
385
540
retval = -1;
386
goto exit;
541
goto mandos_end;
387
542
}
388
543
break;
389
544
default:
390
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
545
fprintf(stderr, "Unknown error while reading data from"
546
" encrypted session with Mandos server\n");
391
547
retval = -1;
392
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
393
goto exit;
548
gnutls_bye (session, GNUTLS_SHUT_RDWR);
549
goto mandos_end;
394
550
}
395
551
} else {
396
buffer_length += ret;
552
buffer_length += (size_t) ret;
397
553
}
398
554
}
399
555
556
if(debug){
557
fprintf(stderr, "Closing TLS session\n");
558
}
559
560
gnutls_bye (session, GNUTLS_SHUT_RDWR);
561
400
562
if (buffer_length > 0){
401
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) == 0){
402
retval = -1;
403
} else {
404
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
563
decrypted_buffer_size = pgp_packet_decrypt(buffer,
564
buffer_length,
565
&decrypted_buffer,
566
keydir);
567
if (decrypted_buffer_size >= 0){
568
written = 0;
569
while(written < (size_t) decrypted_buffer_size){
570
ret = (int)fwrite (decrypted_buffer + written, 1,
571
(size_t)decrypted_buffer_size - written,
572
stdout);
573
if(ret == 0 and ferror(stdout)){
574
if(debug){
575
fprintf(stderr, "Error writing encrypted data: %s\n",
576
strerror(errno));
577
}
578
retval = -1;
579
break;
580
}
581
written += (size_t)ret;
582
}
405
583
free(decrypted_buffer);
584
} else {
585
retval = -1;
406
586
}
407
587
}
408
588
589
/* Shutdown procedure */
590
591
mandos_end:
409
592
free(buffer);
410
411
//shutdown procedure
412
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
413
exit:
414
593
close(tcp_sd);
415
gnutls_deinit (es.session);
416
gnutls_certificate_free_credentials (es.cred);
594
gnutls_deinit (session);
595
gnutls_certificate_free_credentials (mc->cred);
417
596
gnutls_global_deinit ();
418
597
return retval;
419
598
}
420
599
421
static AvahiSimplePoll *simple_poll = NULL;
422
static AvahiServer *server = NULL;
423
424
static void resolve_callback(
425
AvahiSServiceResolver *r,
426
AVAHI_GCC_UNUSED AvahiIfIndex interface,
427
AVAHI_GCC_UNUSED AvahiProtocol protocol,
428
AvahiResolverEvent event,
429
const char *name,
430
const char *type,
431
const char *domain,
432
const char *host_name,
433
const AvahiAddress *address,
434
uint16_t port,
435
AvahiStringList *txt,
436
AvahiLookupResultFlags flags,
437
AVAHI_GCC_UNUSED void* userdata) {
438
439
assert(r);
440
441
/* Called whenever a service has been resolved successfully or timed out */
442
443
switch (event) {
444
case AVAHI_RESOLVER_FAILURE:
445
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
446
break;
447
448
case AVAHI_RESOLVER_FOUND: {
449
char ip[AVAHI_ADDRESS_STR_MAX];
450
avahi_address_snprint(ip, sizeof(ip), address);
451
int ret = start_mandos_communcation(ip, port);
452
if (ret == 0){
453
exit(EXIT_SUCCESS);
454
} else {
455
exit(EXIT_FAILURE);
456
}
457
}
458
}
459
avahi_s_service_resolver_free(r);
460
}
461
462
static void browse_callback(
463
AvahiSServiceBrowser *b,
464
AvahiIfIndex interface,
465
AvahiProtocol protocol,
466
AvahiBrowserEvent event,
467
const char *name,
468
const char *type,
469
const char *domain,
470
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
471
void* userdata) {
472
473
AvahiServer *s = userdata;
474
assert(b);
475
476
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
477
478
switch (event) {
479
480
case AVAHI_BROWSER_FAILURE:
481
482
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
483
avahi_simple_poll_quit(simple_poll);
484
return;
485
486
case AVAHI_BROWSER_NEW:
487
/* We ignore the returned resolver object. In the callback
488
function we free it. If the server is terminated before
489
the callback function is called the server will free
490
the resolver for us. */
491
492
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
493
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
494
495
break;
496
497
case AVAHI_BROWSER_REMOVE:
498
break;
499
500
case AVAHI_BROWSER_ALL_FOR_NOW:
501
case AVAHI_BROWSER_CACHE_EXHAUSTED:
502
break;
503
}
504
}
505
506
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
507
AvahiServerConfig config;
600
static void resolve_callback(AvahiSServiceResolver *r,
601
AvahiIfIndex interface,
602
AVAHI_GCC_UNUSED AvahiProtocol protocol,
603
AvahiResolverEvent event,
604
const char *name,
605
const char *type,
606
const char *domain,
607
const char *host_name,
608
const AvahiAddress *address,
609
uint16_t port,
610
AVAHI_GCC_UNUSED AvahiStringList *txt,
611
AVAHI_GCC_UNUSED AvahiLookupResultFlags
612
flags,
613
void* userdata) {
614
mandos_context *mc = userdata;
615
assert(r); /* Spurious warning */
616
617
/* Called whenever a service has been resolved successfully or
618
timed out */
619
620
switch (event) {
621
default:
622
case AVAHI_RESOLVER_FAILURE:
623
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
624
" of type '%s' in domain '%s': %s\n", name, type, domain,
625
avahi_strerror(avahi_server_errno(mc->server)));
626
break;
627
628
case AVAHI_RESOLVER_FOUND:
629
{
630
char ip[AVAHI_ADDRESS_STR_MAX];
631
avahi_address_snprint(ip, sizeof(ip), address);
632
if(debug){
633
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
634
" port %d\n", name, host_name, ip, interface, port);
635
}
636
int ret = start_mandos_communication(ip, port, interface, mc);
637
if (ret == 0){
638
exit(EXIT_SUCCESS);
639
}
640
}
641
}
642
avahi_s_service_resolver_free(r);
643
}
644
645
static void browse_callback( AvahiSServiceBrowser *b,
646
AvahiIfIndex interface,
647
AvahiProtocol protocol,
648
AvahiBrowserEvent event,
649
const char *name,
650
const char *type,
651
const char *domain,
652
AVAHI_GCC_UNUSED AvahiLookupResultFlags
653
flags,
654
void* userdata) {
655
mandos_context *mc = userdata;
656
assert(b); /* Spurious warning */
657
658
/* Called whenever a new services becomes available on the LAN or
659
is removed from the LAN */
660
661
switch (event) {
662
default:
663
case AVAHI_BROWSER_FAILURE:
664
665
fprintf(stderr, "(Avahi browser) %s\n",
666
avahi_strerror(avahi_server_errno(mc->server)));
667
avahi_simple_poll_quit(mc->simple_poll);
668
return;
669
670
case AVAHI_BROWSER_NEW:
671
/* We ignore the returned Avahi resolver object. In the callback
672
function we free it. If the Avahi server is terminated before
673
the callback function is called the Avahi server will free the
674
resolver for us. */
675
676
if (!(avahi_s_service_resolver_new(mc->server, interface,
677
protocol, name, type, domain,
678
AVAHI_PROTO_INET6, 0,
679
resolve_callback, mc)))
680
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
681
name, avahi_strerror(avahi_server_errno(mc->server)));
682
break;
683
684
case AVAHI_BROWSER_REMOVE:
685
break;
686
687
case AVAHI_BROWSER_ALL_FOR_NOW:
688
case AVAHI_BROWSER_CACHE_EXHAUSTED:
689
if(debug){
690
fprintf(stderr, "No Mandos server found, still searching...\n");
691
}
692
break;
693
}
694
}
695
696
/* Combines file name and path and returns the malloced new
697
string. some sane checks could/should be added */
698
static const char *combinepath(const char *first, const char *second){
699
size_t f_len = strlen(first);
700
size_t s_len = strlen(second);
701
char *tmp = malloc(f_len + s_len + 2);
702
if (tmp == NULL){
703
return NULL;
704
}
705
if(f_len > 0){
706
memcpy(tmp, first, f_len); /* Spurious warning */
707
}
708
tmp[f_len] = '/';
709
if(s_len > 0){
710
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
711
}
712
tmp[f_len + 1 + s_len] = '\0';
713
return tmp;
714
}
715
716
717
int main(int argc, char *argv[]){
508
718
AvahiSServiceBrowser *sb = NULL;
509
719
int error;
510
int ret = 1;
511
512
avahi_set_log_function(empty_log);
513
514
/* Initialize the psuedo-RNG */
515
srand(time(NULL));
516
517
/* Allocate main loop object */
518
if (!(simple_poll = avahi_simple_poll_new())) {
519
fprintf(stderr, "Failed to create simple poll object.\n");
520
goto fail;
521
}
522
523
/* Do not publish any local records */
524
avahi_server_config_init(&config);
525
config.publish_hinfo = 0;
526
config.publish_addresses = 0;
527
config.publish_workstation = 0;
528
config.publish_domain = 0;
529
530
/* /\* Set a unicast DNS server for wide area DNS-SD *\/ */
531
/* avahi_address_parse("193.11.177.11", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]); */
532
/* config.n_wide_area_servers = 1; */
533
/* config.enable_wide_area = 1; */
534
535
/* Allocate a new server */
536
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
537
538
/* Free the configuration data */
539
avahi_server_config_free(&config);
540
541
/* Check wether creating the server object succeeded */
542
if (!server) {
543
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
544
goto fail;
545
}
546
547
/* Create the service browser */
548
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
549
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
550
goto fail;
720
int ret;
721
int exitcode = EXIT_SUCCESS;
722
const char *interface = "eth0";
723
struct ifreq network;
724
int sd;
725
char *connect_to = NULL;
726
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
727
mandos_context mc = { .simple_poll = NULL, .server = NULL,
728
.dh_bits = 1024, .priority = "SECURE256"};
729
730
{
731
/* Temporary int to get the address of for getopt_long */
732
int debug_int = debug ? 1 : 0;
733
while (true){
734
struct option long_options[] = {
735
{"debug", no_argument, &debug_int, 1},
736
{"connect", required_argument, NULL, 'c'},
737
{"interface", required_argument, NULL, 'i'},
738
{"keydir", required_argument, NULL, 'd'},
739
{"seckey", required_argument, NULL, 's'},
740
{"pubkey", required_argument, NULL, 'p'},
741
{"dh-bits", required_argument, NULL, 'D'},
742
{"priority", required_argument, NULL, 'P'},
743
{0, 0, 0, 0} };
744
745
int option_index = 0;
746
ret = getopt_long (argc, argv, "i:", long_options,
747
&option_index);
748
749
if (ret == -1){
750
break;
751
}
752
753
switch(ret){
754
case 0:
755
break;
756
case 'i':
757
interface = optarg;
758
break;
759
case 'c':
760
connect_to = optarg;
761
break;
762
case 'd':
763
keydir = optarg;
764
break;
765
case 'p':
766
pubkeyfile = optarg;
767
break;
768
case 's':
769
seckeyfile = optarg;
770
break;
771
case 'D':
772
errno = 0;
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
774
if (errno){
775
perror("strtol");
776
exit(EXIT_FAILURE);
777
}
778
break;
779
case 'P':
780
mc.priority = optarg;
781
break;
782
case '?':
783
default:
784
/* getopt_long() has already printed a message about the
785
unrcognized option, so just exit. */
786
exit(EXIT_FAILURE);
787
}
788
}
789
/* Set the global debug flag from the temporary int */
790
debug = debug_int ? true : false;
791
}
792
793
pubkeyfile = combinepath(keydir, pubkeyfile);
794
if (pubkeyfile == NULL){
795
perror("combinepath");
796
exitcode = EXIT_FAILURE;
797
goto end;
798
}
799
800
seckeyfile = combinepath(keydir, seckeyfile);
801
if (seckeyfile == NULL){
802
perror("combinepath");
803
goto end;
804
}
805
806
if_index = (AvahiIfIndex) if_nametoindex(interface);
807
if(if_index == 0){
808
fprintf(stderr, "No such interface: \"%s\"\n", interface);
809
exit(EXIT_FAILURE);
810
}
811
812
if(connect_to != NULL){
813
/* Connect directly, do not use Zeroconf */
814
/* (Mainly meant for debugging) */
815
char *address = strrchr(connect_to, ':');
816
if(address == NULL){
817
fprintf(stderr, "No colon in address\n");
818
exit(EXIT_FAILURE);
819
}
820
errno = 0;
821
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
822
if(errno){
823
perror("Bad port number");
824
exit(EXIT_FAILURE);
825
}
826
*address = '\0';
827
address = connect_to;
828
ret = start_mandos_communication(address, port, if_index, &mc);
829
if(ret < 0){
830
exit(EXIT_FAILURE);
831
} else {
832
exit(EXIT_SUCCESS);
833
}
834
}
835
836
/* If the interface is down, bring it up */
837
{
838
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
839
if(sd < 0) {
840
perror("socket");
841
exitcode = EXIT_FAILURE;
842
goto end;
843
}
844
strcpy(network.ifr_name, interface); /* Spurious warning */
845
ret = ioctl(sd, SIOCGIFFLAGS, &network);
846
if(ret == -1){
847
perror("ioctl SIOCGIFFLAGS");
848
exitcode = EXIT_FAILURE;
849
goto end;
850
}
851
if((network.ifr_flags & IFF_UP) == 0){
852
network.ifr_flags |= IFF_UP;
853
ret = ioctl(sd, SIOCSIFFLAGS, &network);
854
if(ret == -1){
855
perror("ioctl SIOCSIFFLAGS");
856
exitcode = EXIT_FAILURE;
857
goto end;
858
}
859
}
860
close(sd);
861
}
862
863
if (not debug){
864
avahi_set_log_function(empty_log);
865
}
866
867
/* Initialize the pseudo-RNG for Avahi */
868
srand((unsigned int) time(NULL));
869
870
/* Allocate main Avahi loop object */
871
mc.simple_poll = avahi_simple_poll_new();
872
if (mc.simple_poll == NULL) {
873
fprintf(stderr, "Avahi: Failed to create simple poll"
874
" object.\n");
875
exitcode = EXIT_FAILURE;
876
goto end;
877
}
878
879
{
880
AvahiServerConfig config;
881
/* Do not publish any local Zeroconf records */
882
avahi_server_config_init(&config);
883
config.publish_hinfo = 0;
884
config.publish_addresses = 0;
885
config.publish_workstation = 0;
886
config.publish_domain = 0;
887
888
/* Allocate a new server */
889
mc.server = avahi_server_new(avahi_simple_poll_get
890
(mc.simple_poll), &config, NULL,
891
NULL, &error);
892
893
/* Free the Avahi configuration data */
894
avahi_server_config_free(&config);
895
}
896
897
/* Check if creating the Avahi server object succeeded */
898
if (mc.server == NULL) {
899
fprintf(stderr, "Failed to create Avahi server: %s\n",
900
avahi_strerror(error));
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
905
/* Create the Avahi service browser */
906
sb = avahi_s_service_browser_new(mc.server, if_index,
907
AVAHI_PROTO_INET6,
908
"_mandos._tcp", NULL, 0,
909
browse_callback, &mc);
910
if (sb == NULL) {
911
fprintf(stderr, "Failed to create service browser: %s\n",
912
avahi_strerror(avahi_server_errno(mc.server)));
913
exitcode = EXIT_FAILURE;
914
goto end;
551
915
}
552
916
553
917
/* Run the main loop */
554
avahi_simple_poll_loop(simple_poll);
555
556
ret = 0;
557
558
fail:
918
919
if (debug){
920
fprintf(stderr, "Starting Avahi loop search\n");
921
}
922
923
avahi_simple_poll_loop(mc.simple_poll);
924
925
end:
926
927
if (debug){
928
fprintf(stderr, "%s exiting\n", argv[0]);
929
}
559
930
560
931
/* Cleanup things */
561
if (sb)
932
if (sb != NULL)
562
933
avahi_s_service_browser_free(sb);
563
934
564
if (server)
565
avahi_server_free(server);
566
567
if (simple_poll)
568
avahi_simple_poll_free(simple_poll);
569
570
return ret;
935
if (mc.server != NULL)
936
avahi_server_free(mc.server);
937
938
if (mc.simple_poll != NULL)
939
avahi_simple_poll_free(mc.simple_poll);
940
free(pubkeyfile);
941
free(seckeyfile);
942
943
return exitcode;
571
944
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0