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- Committer: Teddy Hogeborn
- Date: 2008-08-04 16:05:01 UTC
- mfrom: (24.1.15 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804160501-woej7nf8amgrbc2e
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
to be a union. All users changed.
to be a union. All users changed.
- 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 */
61
62
// gpgme
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
71
/* GPGME */
63
72
#include <errno.h> /* perror() */
64
73
#include <gpgme.h>
65
74
66
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
75
#define BUFFER_SIZE 256
73
#define DH_BITS 1024
74
76
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
static const char mandos_protocol_version[] = "1";
82
83
/* Used for passing in values through the Avahi callback functions */
75
84
typedef struct {
76
gnutls_session_t session;
85
AvahiSimplePoll *simple_poll;
86
AvahiServer *server;
77
87
gnutls_certificate_credentials_t cred;
88
unsigned int dh_bits;
78
89
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){
90
const char *priority;
91
} mandos_context;
92
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
97
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
99
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
101
return 0;
102
}
103
buffer_capacity += BUFFER_SIZE;
104
}
105
return buffer_capacity;
106
}
107
108
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
111
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
83
116
gpgme_data_t dh_crypto, dh_plain;
84
117
gpgme_ctx_t ctx;
85
118
gpgme_error_t rc;
86
119
ssize_t ret;
87
size_t new_packet_capacity = 0;
88
size_t new_packet_length = 0;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
89
122
gpgme_engine_info_t engine_info;
90
123
124
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
126
}
127
91
128
/* Init GPGME */
92
129
gpgme_check_version(NULL);
93
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
130
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
131
if (rc != GPG_ERR_NO_ERROR){
132
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
133
gpgme_strsource(rc), gpgme_strerror(rc));
134
return -1;
135
}
94
136
95
/* Set GPGME home directory */
137
/* Set GPGME home directory for the OpenPGP engine only */
96
138
rc = gpgme_get_engine_info (&engine_info);
97
139
if (rc != GPG_ERR_NO_ERROR){
98
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
108
150
engine_info = engine_info->next;
109
151
}
110
152
if(engine_info == NULL){
111
fprintf(stderr, "Could not set home dir to %s\n", homedir);
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
112
154
return -1;
113
155
}
114
156
115
/* Create new GPGME data buffer from packet buffer */
116
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
157
/* Create new GPGME data buffer from memory cryptotext */
158
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
0);
117
160
if (rc != GPG_ERR_NO_ERROR){
118
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
119
162
gpgme_strsource(rc), gpgme_strerror(rc));
125
168
if (rc != GPG_ERR_NO_ERROR){
126
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
127
170
gpgme_strsource(rc), gpgme_strerror(rc));
171
gpgme_data_release(dh_crypto);
128
172
return -1;
129
173
}
130
174
133
177
if (rc != GPG_ERR_NO_ERROR){
134
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
135
179
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
180
plaintext_length = -1;
181
goto decrypt_end;
137
182
}
138
183
139
/* Decrypt data from the FILE pointer to the plaintext data buffer */
184
/* Decrypt data from the cryptotext data buffer to the plaintext
185
data buffer */
140
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
141
187
if (rc != GPG_ERR_NO_ERROR){
142
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
143
189
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);
190
plaintext_length = -1;
191
goto decrypt_end;
192
}
193
194
if(debug){
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
}
197
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
220
? "No" : "Yes");
221
recipient = recipient->next;
222
}
223
}
224
}
225
}
169
226
170
227
/* 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;
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
230
plaintext_length = -1;
231
goto decrypt_end;
232
}
233
234
*plaintext = NULL;
174
235
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;
236
plaintext_capacity = adjustbuffer(plaintext,
237
(size_t)plaintext_length,
238
plaintext_capacity);
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
241
plaintext_length = -1;
242
goto decrypt_end;
182
243
}
183
244
184
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
245
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
246
BUFFER_SIZE);
185
247
/* Print the data, if any */
186
248
if (ret == 0){
187
/* If password is empty, then a incorrect error will be printed */
249
/* EOF */
188
250
break;
189
251
}
190
252
if(ret < 0){
191
253
perror("gpgme_data_read");
192
return -1;
254
plaintext_length = -1;
255
goto decrypt_end;
193
256
}
194
new_packet_length += ret;
257
plaintext_length += ret;
195
258
}
196
259
197
/* Delete the GPGME plaintext data buffer */
260
if(debug){
261
fprintf(stderr, "Decrypted password is: ");
262
for(ssize_t i = 0; i < plaintext_length; i++){
263
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
264
}
265
fprintf(stderr, "\n");
266
}
267
268
decrypt_end:
269
270
/* Delete the GPGME cryptotext data buffer */
271
gpgme_data_release(dh_crypto);
272
273
/* Delete the GPGME plaintext data buffer */
198
274
gpgme_data_release(dh_plain);
199
return new_packet_length;
275
return plaintext_length;
200
276
}
201
277
202
278
static const char * safer_gnutls_strerror (int value) {
206
282
return ret;
207
283
}
208
284
209
void debuggnutls(int level, const char* string){
210
fprintf(stderr, "%s", string);
285
/* GnuTLS log function callback */
286
static void debuggnutls(__attribute__((unused)) int level,
287
const char* string){
288
fprintf(stderr, "GnuTLS: %s", string);
211
289
}
212
290
213
int initgnutls(encrypted_session *es){
214
const char *err;
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
215
294
int ret;
216
295
296
if(debug){
297
fprintf(stderr, "Initializing GnuTLS\n");
298
}
299
217
300
if ((ret = gnutls_global_init ())
218
301
!= GNUTLS_E_SUCCESS) {
219
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
220
304
return -1;
221
305
}
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))
306
307
if (debug){
308
/* "Use a log level over 10 to enable all debugging options."
309
* - GnuTLS manual
310
*/
311
gnutls_global_set_log_level(11);
312
gnutls_global_set_log_function(debuggnutls);
313
}
314
315
/* OpenPGP credentials */
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
230
317
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
318
fprintf (stderr, "GnuTLS memory error: %s\n",
319
safer_gnutls_strerror(ret));
232
320
return -1;
233
321
}
234
322
323
if(debug){
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
327
}
328
235
329
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
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
332
fprintf(stderr,
333
"Error[%d] while reading the OpenPGP key pair ('%s',"
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
336
safer_gnutls_strerror(ret));
337
return -1;
338
}
339
340
/* GnuTLS server initialization */
341
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
345
return -1;
346
}
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
351
return -1;
352
}
353
354
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
355
356
return 0;
357
}
358
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
361
int ret;
362
/* GnuTLS session creation */
363
ret = gnutls_init(session, GNUTLS_SERVER);
364
if (ret != GNUTLS_E_SUCCESS){
365
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
366
safer_gnutls_strerror(ret));
367
}
368
369
{
370
const char *err;
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
373
fprintf(stderr, "Syntax error at: %s\n", err);
374
fprintf(stderr, "GnuTLS error: %s\n",
375
safer_gnutls_strerror(ret));
376
return -1;
377
}
378
}
379
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
381
mc->cred);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
384
safer_gnutls_strerror(ret));
385
return -1;
386
}
387
286
388
/* ignore client certificate if any. */
287
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
389
gnutls_certificate_server_set_request (*session,
390
GNUTLS_CERT_IGNORE);
288
391
289
gnutls_dh_set_prime_bits (es->session, DH_BITS);
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
290
393
291
394
return 0;
292
395
}
293
396
294
void empty_log(AvahiLogLevel level, const char *txt){}
397
/* Avahi log function callback */
398
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
399
__attribute__((unused)) const char *txt){}
295
400
296
int start_mandos_communcation(char *ip, uint16_t port){
401
/* Called when a Mandos server is found */
402
static int start_mandos_communication(const char *ip, uint16_t port,
403
AvahiIfIndex if_index,
404
mandos_context *mc){
297
405
int ret, tcp_sd;
298
struct sockaddr_in6 to;
299
struct in6_addr ip_addr;
300
encrypted_session es;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
301
407
char *buffer = NULL;
302
408
char *decrypted_buffer;
303
409
size_t buffer_length = 0;
304
410
size_t buffer_capacity = 0;
305
411
ssize_t decrypted_buffer_size;
412
size_t written;
306
413
int retval = 0;
307
414
char interface[IF_NAMESIZE];
415
gnutls_session_t session;
416
417
ret = init_gnutls_session (mc, &session);
418
if (ret != 0){
419
return -1;
420
}
421
422
if(debug){
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
424
ip, port);
425
}
308
426
309
427
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
310
428
if(tcp_sd < 0) {
311
429
perror("socket");
312
430
return -1;
313
431
}
314
315
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);
316
if(tcp_sd < 0) {
317
perror("setsockopt bindtodevice");
318
return -1;
432
433
if(debug){
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
435
perror("if_indextoname");
436
return -1;
437
}
438
fprintf(stderr, "Binding to interface %s\n", interface);
319
439
}
320
440
321
memset(&to,0,sizeof(to));
322
to.sin6_family = AF_INET6;
323
ret = inet_pton(AF_INET6, ip, &ip_addr);
441
memset(&to,0,sizeof(to)); /* Spurious warning */
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
324
446
if (ret < 0 ){
325
447
perror("inet_pton");
326
448
return -1;
327
}
449
}
328
450
if(ret == 0){
329
451
fprintf(stderr, "Bad address: %s\n", ip);
330
452
return -1;
331
453
}
332
to.sin6_port = htons(port);
333
to.sin6_scope_id = if_nametoindex("eth0");
334
335
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
454
to.in6.sin6_port = htons(port); /* Spurious warning */
455
456
to.in6.sin6_scope_id = (uint32_t)if_index;
457
458
if(debug){
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
463
perror("inet_ntop");
464
} else {
465
if(strcmp(addrstr, ip) != 0){
466
fprintf(stderr, "Canonical address form: %s\n", addrstr);
467
}
468
}
469
}
470
471
ret = connect(tcp_sd, &to.in, sizeof(to));
336
472
if (ret < 0){
337
473
perror("connect");
338
474
return -1;
339
475
}
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
476
350
ret = gnutls_handshake (es.session);
477
const char *out = mandos_protocol_version;
478
written = 0;
479
while (true){
480
size_t out_size = strlen(out);
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
482
out_size - written));
483
if (ret == -1){
484
perror("write");
485
retval = -1;
486
goto mandos_end;
487
}
488
written += (size_t)ret;
489
if(written < out_size){
490
continue;
491
} else {
492
if (out == mandos_protocol_version){
493
written = 0;
494
out = "\r\n";
495
} else {
496
break;
497
}
498
}
499
}
500
501
if(debug){
502
fprintf(stderr, "Establishing TLS session with %s\n", ip);
503
}
504
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
506
507
ret = gnutls_handshake (session);
351
508
352
509
if (ret != GNUTLS_E_SUCCESS){
353
fprintf(stderr, "\n*** Handshake failed ***\n");
354
gnutls_perror (ret);
510
if(debug){
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
512
gnutls_perror (ret);
513
}
355
514
retval = -1;
356
goto exit;
515
goto mandos_end;
516
}
517
518
/* Read OpenPGP packet that contains the wanted password */
519
520
if(debug){
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
522
ip);
357
523
}
358
524
359
//retrive password
360
525
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;
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
527
buffer_capacity);
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
530
retval = -1;
531
goto mandos_end;
368
532
}
369
533
370
ret = gnutls_record_recv
371
(es.session, buffer+buffer_length, BUFFER_SIZE);
534
ret = gnutls_record_recv(session, buffer+buffer_length,
535
BUFFER_SIZE);
372
536
if (ret == 0){
373
537
break;
374
538
}
378
542
case GNUTLS_E_AGAIN:
379
543
break;
380
544
case GNUTLS_E_REHANDSHAKE:
381
ret = gnutls_handshake (es.session);
545
ret = gnutls_handshake (session);
382
546
if (ret < 0){
383
fprintf(stderr, "\n*** Handshake failed ***\n");
547
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
384
548
gnutls_perror (ret);
385
549
retval = -1;
386
goto exit;
550
goto mandos_end;
387
551
}
388
552
break;
389
553
default:
390
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
554
fprintf(stderr, "Unknown error while reading data from"
555
" encrypted session with Mandos server\n");
391
556
retval = -1;
392
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
393
goto exit;
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
558
goto mandos_end;
394
559
}
395
560
} else {
396
buffer_length += ret;
561
buffer_length += (size_t) ret;
397
562
}
398
563
}
399
564
565
if(debug){
566
fprintf(stderr, "Closing TLS session\n");
567
}
568
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
570
400
571
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);
572
decrypted_buffer_size = pgp_packet_decrypt(buffer,
573
buffer_length,
574
&decrypted_buffer,
575
keydir);
576
if (decrypted_buffer_size >= 0){
577
written = 0;
578
while(written < (size_t) decrypted_buffer_size){
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
581
stdout);
582
if(ret == 0 and ferror(stdout)){
583
if(debug){
584
fprintf(stderr, "Error writing encrypted data: %s\n",
585
strerror(errno));
586
}
587
retval = -1;
588
break;
589
}
590
written += (size_t)ret;
591
}
405
592
free(decrypted_buffer);
593
} else {
594
retval = -1;
406
595
}
407
596
}
408
597
598
/* Shutdown procedure */
599
600
mandos_end:
409
601
free(buffer);
410
411
//shutdown procedure
412
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
413
exit:
414
602
close(tcp_sd);
415
gnutls_deinit (es.session);
416
gnutls_certificate_free_credentials (es.cred);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
417
605
gnutls_global_deinit ();
418
606
return retval;
419
607
}
420
608
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;
609
static void resolve_callback(AvahiSServiceResolver *r,
610
AvahiIfIndex interface,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
612
AvahiResolverEvent event,
613
const char *name,
614
const char *type,
615
const char *domain,
616
const char *host_name,
617
const AvahiAddress *address,
618
uint16_t port,
619
AVAHI_GCC_UNUSED AvahiStringList *txt,
620
AVAHI_GCC_UNUSED AvahiLookupResultFlags
621
flags,
622
void* userdata) {
623
mandos_context *mc = userdata;
624
assert(r); /* Spurious warning */
625
626
/* Called whenever a service has been resolved successfully or
627
timed out */
628
629
switch (event) {
630
default:
631
case AVAHI_RESOLVER_FAILURE:
632
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
633
" of type '%s' in domain '%s': %s\n", name, type, domain,
634
avahi_strerror(avahi_server_errno(mc->server)));
635
break;
636
637
case AVAHI_RESOLVER_FOUND:
638
{
639
char ip[AVAHI_ADDRESS_STR_MAX];
640
avahi_address_snprint(ip, sizeof(ip), address);
641
if(debug){
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
644
}
645
int ret = start_mandos_communication(ip, port, interface, mc);
646
if (ret == 0){
647
exit(EXIT_SUCCESS);
648
}
649
}
650
}
651
avahi_s_service_resolver_free(r);
652
}
653
654
static void browse_callback( AvahiSServiceBrowser *b,
655
AvahiIfIndex interface,
656
AvahiProtocol protocol,
657
AvahiBrowserEvent event,
658
const char *name,
659
const char *type,
660
const char *domain,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(b); /* Spurious warning */
666
667
/* Called whenever a new services becomes available on the LAN or
668
is removed from the LAN */
669
670
switch (event) {
671
default:
672
case AVAHI_BROWSER_FAILURE:
673
674
fprintf(stderr, "(Avahi browser) %s\n",
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
677
return;
678
679
case AVAHI_BROWSER_NEW:
680
/* We ignore the returned Avahi resolver object. In the callback
681
function we free it. If the Avahi server is terminated before
682
the callback function is called the Avahi server will free the
683
resolver for us. */
684
685
if (!(avahi_s_service_resolver_new(mc->server, interface,
686
protocol, name, type, domain,
687
AVAHI_PROTO_INET6, 0,
688
resolve_callback, mc)))
689
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
690
name, avahi_strerror(avahi_server_errno(mc->server)));
691
break;
692
693
case AVAHI_BROWSER_REMOVE:
694
break;
695
696
case AVAHI_BROWSER_ALL_FOR_NOW:
697
case AVAHI_BROWSER_CACHE_EXHAUSTED:
698
if(debug){
699
fprintf(stderr, "No Mandos server found, still searching...\n");
700
}
701
break;
702
}
703
}
704
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
711
if (tmp == NULL){
712
return NULL;
713
}
714
if(f_len > 0){
715
memcpy(tmp, first, f_len); /* Spurious warning */
716
}
717
tmp[f_len] = '/';
718
if(s_len > 0){
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
720
}
721
tmp[f_len + 1 + s_len] = '\0';
722
return tmp;
723
}
724
725
726
int main(int argc, char *argv[]){
508
727
AvahiSServiceBrowser *sb = NULL;
509
728
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;
729
int ret;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
733
int sd;
734
uid_t uid;
735
gid_t gid;
736
char *connect_to = NULL;
737
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
742
743
{
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
748
.arg = "IP",
749
.doc = "Connect directly to a sepcified mandos server",
750
.group = 1 },
751
{ .name = "interface", .key = 'i',
752
.arg = "INTERFACE",
753
.doc = "Interface that Avahi will conntect through",
754
.group = 1 },
755
{ .name = "keydir", .key = 'd',
756
.arg = "KEYDIR",
757
.doc = "Directory where the openpgp keyring is",
758
.group = 1 },
759
{ .name = "seckey", .key = 's',
760
.arg = "SECKEY",
761
.doc = "Secret openpgp key for gnutls authentication",
762
.group = 1 },
763
{ .name = "pubkey", .key = 'p',
764
.arg = "PUBKEY",
765
.doc = "Public openpgp key for gnutls authentication",
766
.group = 2 },
767
{ .name = "dh-bits", .key = 129,
768
.arg = "BITS",
769
.doc = "dh-bits to use in gnutls communication",
770
.group = 2 },
771
{ .name = "priority", .key = 130,
772
.arg = "PRIORITY",
773
.doc = "GNUTLS priority", .group = 1 },
774
{ .name = NULL }
775
};
776
777
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
782
switch (key) {
783
case 128:
784
debug = true;
785
break;
786
case 'c':
787
connect_to = arg;
788
break;
789
case 'i':
790
interface = arg;
791
break;
792
case 'd':
793
keydir = arg;
794
break;
795
case 's':
796
seckeyfile = arg;
797
break;
798
case 'p':
799
pubkeyfile = arg;
800
break;
801
case 129:
802
errno = 0;
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
804
if (errno){
805
perror("strtol");
806
exit(EXIT_FAILURE);
807
}
808
break;
809
case 130:
810
mc.priority = arg;
811
break;
812
case ARGP_KEY_ARG:
813
argp_usage (state);
814
break;
815
case ARGP_KEY_END:
816
break;
817
default:
818
return ARGP_ERR_UNKNOWN;
819
}
820
return 0;
821
}
822
823
struct argp argp = { .options = options, .parser = parse_opt,
824
.args_doc = "",
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
828
}
829
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
833
exitcode = EXIT_FAILURE;
834
goto end;
835
}
836
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
840
goto end;
841
}
842
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
844
if (ret == -1){
845
fprintf(stderr, "init_gnutls_global\n");
846
goto end;
847
}
848
849
uid = getuid();
850
gid = getgid();
851
852
ret = setuid(uid);
853
if (ret == -1){
854
perror("setuid");
855
}
856
857
setgid(gid);
858
if (ret == -1){
859
perror("setgid");
860
}
861
862
if_index = (AvahiIfIndex) if_nametoindex(interface);
863
if(if_index == 0){
864
fprintf(stderr, "No such interface: \"%s\"\n", interface);
865
exit(EXIT_FAILURE);
866
}
867
868
if(connect_to != NULL){
869
/* Connect directly, do not use Zeroconf */
870
/* (Mainly meant for debugging) */
871
char *address = strrchr(connect_to, ':');
872
if(address == NULL){
873
fprintf(stderr, "No colon in address\n");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
errno = 0;
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
879
if(errno){
880
perror("Bad port number");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
*address = '\0';
885
address = connect_to;
886
ret = start_mandos_communication(address, port, if_index, &mc);
887
if(ret < 0){
888
exitcode = EXIT_FAILURE;
889
} else {
890
exitcode = EXIT_SUCCESS;
891
}
892
goto end;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
if(ret == -1){
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
920
}
921
922
if (not debug){
923
avahi_set_log_function(empty_log);
924
}
925
926
/* Initialize the pseudo-RNG for Avahi */
927
srand((unsigned int) time(NULL));
928
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
933
" object.\n");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
938
{
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
946
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
950
NULL, &error);
951
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
954
}
955
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
959
avahi_strerror(error));
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
966
AVAHI_PROTO_INET6,
967
"_mandos._tcp", NULL, 0,
968
browse_callback, &mc);
969
if (sb == NULL) {
970
fprintf(stderr, "Failed to create service browser: %s\n",
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
973
goto end;
551
974
}
552
975
553
976
/* Run the main loop */
554
avahi_simple_poll_loop(simple_poll);
555
556
ret = 0;
557
558
fail:
977
978
if (debug){
979
fprintf(stderr, "Starting Avahi loop search\n");
980
}
981
982
avahi_simple_poll_loop(mc.simple_poll);
983
984
end:
985
986
if (debug){
987
fprintf(stderr, "%s exiting\n", argv[0]);
988
}
559
989
560
990
/* Cleanup things */
561
if (sb)
991
if (sb != NULL)
562
992
avahi_s_service_browser_free(sb);
563
993
564
if (server)
565
avahi_server_free(server);
566
567
if (simple_poll)
568
avahi_simple_poll_free(simple_poll);
569
570
return ret;
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
996
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
999
free(pubkeyfile);
1000
free(seckeyfile);
1001
1002
return exitcode;
571
1003
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0