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- Committer: Björn Påhlsson
- Date: 2008-07-20 03:51:41 UTC
- Revision ID: belorn@braxen-20080720035141-ta0y0be7fotdm4ks
Fixed a overbufferflow bug, thanks to a forgotten \0
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
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.
4
6
*
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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
* General Public License for more details.
24
*
25
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
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.
30
12
*/
31
13
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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
33
33
#define _LARGEFILE_SOURCE
34
34
#define _FILE_OFFSET_BITS 64
35
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
42
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, false, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
SIOCSIFFLAGS, if_indextoname(),
65
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
81
82
#ifdef __linux__
83
#include <sys/klog.h> /* klogctl() */
84
#endif /* __linux__ */
85
86
/* Avahi */
87
/* All Avahi types, constants and functions
88
Avahi*, avahi_*,
89
AVAHI_* */
36
#include <stdio.h>
37
#include <assert.h>
38
#include <stdlib.h>
39
#include <time.h>
40
#include <net/if.h> /* if_nametoindex */
41
90
42
#include <avahi-core/core.h>
91
43
#include <avahi-core/lookup.h>
92
44
#include <avahi-core/log.h>
94
46
#include <avahi-common/malloc.h>
95
47
#include <avahi-common/error.h>
96
48
97
/* GnuTLS */
98
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
99
functions:
100
gnutls_*
101
init_gnutls_session(),
102
GNUTLS_* */
103
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
106
107
/* GPGME */
108
#include <gpgme.h> /* All GPGME types, constants and
109
functions:
110
gpgme_*
111
GPGME_PROTOCOL_OpenPGP,
112
GPG_ERR_NO_* */
113
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
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
61
62
// gpgme
63
#include <errno.h> /* perror() */
64
#include <gpgme.h>
65
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"
114
72
#define BUFFER_SIZE 256
115
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
119
120
bool debug = false;
121
static const char mandos_protocol_version[] = "1";
122
const char *argp_program_version = "mandos-client " VERSION;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
124
125
/* Used for passing in values through the Avahi callback functions */
73
#define DH_BITS 1024
74
126
75
typedef struct {
127
AvahiSimplePoll *simple_poll;
128
AvahiServer *server;
76
gnutls_session_t session;
129
77
gnutls_certificate_credentials_t cred;
130
unsigned int dh_bits;
131
78
gnutls_dh_params_t dh_params;
132
const char *priority;
79
} encrypted_session;
80
81
82
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
83
gpgme_data_t dh_crypto, dh_plain;
133
84
gpgme_ctx_t ctx;
134
} mandos_context;
135
136
/* global context so signal handler can reach it*/
137
mandos_context mc;
138
139
/*
140
* Make additional room in "buffer" for at least BUFFER_SIZE more
141
* bytes. "buffer_capacity" is how much is currently allocated,
142
* "buffer_length" is how much is already used.
143
*/
144
size_t incbuffer(char **buffer, size_t buffer_length,
145
size_t buffer_capacity){
146
if(buffer_length + BUFFER_SIZE > buffer_capacity){
147
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
148
if(buffer == NULL){
149
return 0;
150
}
151
buffer_capacity += BUFFER_SIZE;
152
}
153
return buffer_capacity;
154
}
155
156
/*
157
* Initialize GPGME.
158
*/
159
static bool init_gpgme(const char *seckey,
160
const char *pubkey, const char *tempdir){
161
int ret;
162
85
gpgme_error_t rc;
86
ssize_t ret;
87
size_t new_packet_capacity = 0;
88
size_t new_packet_length = 0;
163
89
gpgme_engine_info_t engine_info;
164
165
166
/*
167
* Helper function to insert pub and seckey to the engine keyring.
168
*/
169
bool import_key(const char *filename){
170
int fd;
171
gpgme_data_t pgp_data;
172
173
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
174
if(fd == -1){
175
perror("open");
176
return false;
177
}
178
179
rc = gpgme_data_new_from_fd(&pgp_data, fd);
180
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
183
return false;
184
}
185
186
rc = gpgme_op_import(mc.ctx, pgp_data);
187
if(rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
189
gpgme_strsource(rc), gpgme_strerror(rc));
190
return false;
191
}
192
193
ret = (int)TEMP_FAILURE_RETRY(close(fd));
194
if(ret == -1){
195
perror("close");
196
}
197
gpgme_data_release(pgp_data);
198
return true;
199
}
200
201
if(debug){
202
fprintf(stderr, "Initializing GPGME\n");
203
}
204
90
205
91
/* Init GPGME */
206
92
gpgme_check_version(NULL);
207
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
208
if(rc != GPG_ERR_NO_ERROR){
209
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
210
gpgme_strsource(rc), gpgme_strerror(rc));
211
return false;
212
}
93
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
213
94
214
/* Set GPGME home directory for the OpenPGP engine only */
215
rc = gpgme_get_engine_info(&engine_info);
216
if(rc != GPG_ERR_NO_ERROR){
95
/* Set GPGME home directory */
96
rc = gpgme_get_engine_info (&engine_info);
97
if (rc != GPG_ERR_NO_ERROR){
217
98
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
218
99
gpgme_strsource(rc), gpgme_strerror(rc));
219
return false;
100
return -1;
220
101
}
221
102
while(engine_info != NULL){
222
103
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
223
104
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
224
engine_info->file_name, tempdir);
105
engine_info->file_name, homedir);
225
106
break;
226
107
}
227
108
engine_info = engine_info->next;
228
109
}
229
110
if(engine_info == NULL){
230
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
231
return false;
232
}
233
234
/* Create new GPGME "context" */
235
rc = gpgme_new(&(mc.ctx));
236
if(rc != GPG_ERR_NO_ERROR){
237
fprintf(stderr, "bad gpgme_new: %s: %s\n",
238
gpgme_strsource(rc), gpgme_strerror(rc));
239
return false;
240
}
241
242
if(not import_key(pubkey) or not import_key(seckey)){
243
return false;
244
}
245
246
return true;
247
}
248
249
/*
250
* Decrypt OpenPGP data.
251
* Returns -1 on error
252
*/
253
static ssize_t pgp_packet_decrypt(const char *cryptotext,
254
size_t crypto_size,
255
char **plaintext){
256
gpgme_data_t dh_crypto, dh_plain;
257
gpgme_error_t rc;
258
ssize_t ret;
259
size_t plaintext_capacity = 0;
260
ssize_t plaintext_length = 0;
261
262
if(debug){
263
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
264
}
265
266
/* Create new GPGME data buffer from memory cryptotext */
267
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
268
0);
269
if(rc != GPG_ERR_NO_ERROR){
111
fprintf(stderr, "Could not set home dir to %s\n", homedir);
112
return -1;
113
}
114
115
/* Create new GPGME data buffer from packet buffer */
116
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
117
if (rc != GPG_ERR_NO_ERROR){
270
118
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
271
119
gpgme_strsource(rc), gpgme_strerror(rc));
272
120
return -1;
274
122
275
123
/* Create new empty GPGME data buffer for the plaintext */
276
124
rc = gpgme_data_new(&dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
125
if (rc != GPG_ERR_NO_ERROR){
278
126
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
279
127
gpgme_strsource(rc), gpgme_strerror(rc));
280
gpgme_data_release(dh_crypto);
281
return -1;
282
}
283
284
/* Decrypt data from the cryptotext data buffer to the plaintext
285
data buffer */
286
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
287
if(rc != GPG_ERR_NO_ERROR){
128
return -1;
129
}
130
131
/* Create new GPGME "context" */
132
rc = gpgme_new(&ctx);
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_new: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
136
return -1;
137
}
138
139
/* Decrypt data from the FILE pointer to the plaintext data buffer */
140
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
141
if (rc != GPG_ERR_NO_ERROR){
288
142
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
289
143
gpgme_strsource(rc), gpgme_strerror(rc));
290
plaintext_length = -1;
291
if(debug){
292
gpgme_decrypt_result_t result;
293
result = gpgme_op_decrypt_result(mc.ctx);
294
if(result == NULL){
295
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
296
} else {
297
fprintf(stderr, "Unsupported algorithm: %s\n",
298
result->unsupported_algorithm);
299
fprintf(stderr, "Wrong key usage: %u\n",
300
result->wrong_key_usage);
301
if(result->file_name != NULL){
302
fprintf(stderr, "File name: %s\n", result->file_name);
303
}
304
gpgme_recipient_t recipient;
305
recipient = result->recipients;
306
if(recipient){
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
313
? "No" : "Yes");
314
recipient = recipient->next;
315
}
316
}
317
}
318
}
319
goto decrypt_end;
144
return -1;
320
145
}
321
146
322
if(debug){
323
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
324
}
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);
325
169
326
170
/* Seek back to the beginning of the GPGME plaintext data buffer */
327
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
328
perror("gpgme_data_seek");
329
plaintext_length = -1;
330
goto decrypt_end;
331
}
332
333
*plaintext = NULL;
171
gpgme_data_seek(dh_plain, 0, SEEK_SET);
172
173
*new_packet = 0;
334
174
while(true){
335
plaintext_capacity = incbuffer(plaintext,
336
(size_t)plaintext_length,
337
plaintext_capacity);
338
if(plaintext_capacity == 0){
339
perror("incbuffer");
340
plaintext_length = -1;
341
goto decrypt_end;
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;
342
182
}
343
183
344
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
345
BUFFER_SIZE);
184
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
346
185
/* Print the data, if any */
347
if(ret == 0){
348
/* EOF */
186
if (ret == 0){
187
/* If password is empty, then a incorrect error will be printed */
349
188
break;
350
189
}
351
190
if(ret < 0){
352
191
perror("gpgme_data_read");
353
plaintext_length = -1;
354
goto decrypt_end;
355
}
356
plaintext_length += ret;
357
}
358
359
if(debug){
360
fprintf(stderr, "Decrypted password is: ");
361
for(ssize_t i = 0; i < plaintext_length; i++){
362
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
363
}
364
fprintf(stderr, "\n");
365
}
366
367
decrypt_end:
368
369
/* Delete the GPGME cryptotext data buffer */
370
gpgme_data_release(dh_crypto);
371
372
/* Delete the GPGME plaintext data buffer */
192
return -1;
193
}
194
new_packet_length += ret;
195
}
196
197
/* Delete the GPGME plaintext data buffer */
373
198
gpgme_data_release(dh_plain);
374
return plaintext_length;
199
return new_packet_length;
375
200
}
376
201
377
static const char * safer_gnutls_strerror(int value){
378
const char *ret = gnutls_strerror(value); /* Spurious warning from
379
-Wunreachable-code */
380
if(ret == NULL)
202
static const char * safer_gnutls_strerror (int value) {
203
const char *ret = gnutls_strerror (value);
204
if (ret == NULL)
381
205
ret = "(unknown)";
382
206
return ret;
383
207
}
384
208
385
/* GnuTLS log function callback */
386
static void debuggnutls(__attribute__((unused)) int level,
387
const char* string){
388
fprintf(stderr, "GnuTLS: %s", string);
209
void debuggnutls(int level, const char* string){
210
fprintf(stderr, "%s", string);
389
211
}
390
212
391
static int init_gnutls_global(const char *pubkeyfilename,
392
const char *seckeyfilename){
213
int initgnutls(encrypted_session *es){
214
const char *err;
393
215
int ret;
394
216
395
if(debug){
396
fprintf(stderr, "Initializing GnuTLS\n");
397
}
398
399
ret = gnutls_global_init();
400
if(ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "GnuTLS global_init: %s\n",
402
safer_gnutls_strerror(ret));
403
return -1;
404
}
405
406
if(debug){
407
/* "Use a log level over 10 to enable all debugging options."
408
* - GnuTLS manual
409
*/
410
gnutls_global_set_log_level(11);
411
gnutls_global_set_log_function(debuggnutls);
412
}
413
414
/* OpenPGP credentials */
415
gnutls_certificate_allocate_credentials(&mc.cred);
416
if(ret != GNUTLS_E_SUCCESS){
417
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
418
from
419
-Wunreachable-code
420
*/
421
safer_gnutls_strerror(ret));
422
gnutls_global_deinit();
423
return -1;
424
}
425
426
if(debug){
427
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
428
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
429
seckeyfilename);
430
}
431
217
if ((ret = gnutls_global_init ())
218
!= GNUTLS_E_SUCCESS) {
219
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
220
return -1;
221
}
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))
230
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
232
return -1;
233
}
234
432
235
ret = gnutls_certificate_set_openpgp_key_file
433
(mc.cred, pubkeyfilename, seckeyfilename,
434
GNUTLS_OPENPGP_FMT_BASE64);
435
if(ret != GNUTLS_E_SUCCESS){
436
fprintf(stderr,
437
"Error[%d] while reading the OpenPGP key pair ('%s',"
438
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
439
fprintf(stderr, "The GnuTLS error is: %s\n",
440
safer_gnutls_strerror(ret));
441
goto globalfail;
442
}
443
444
/* GnuTLS server initialization */
445
ret = gnutls_dh_params_init(&mc.dh_params);
446
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
448
" %s\n", safer_gnutls_strerror(ret));
449
goto globalfail;
450
}
451
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
454
safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
458
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
459
460
return 0;
461
462
globalfail:
463
464
gnutls_certificate_free_credentials(mc.cred);
465
gnutls_global_deinit();
466
gnutls_dh_params_deinit(mc.dh_params);
467
return -1;
468
}
469
470
static int init_gnutls_session(gnutls_session_t *session){
471
int ret;
472
/* GnuTLS session creation */
473
ret = gnutls_init(session, GNUTLS_SERVER);
474
if(ret != GNUTLS_E_SUCCESS){
475
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
476
safer_gnutls_strerror(ret));
477
}
478
479
{
480
const char *err;
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
482
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "Syntax error at: %s\n", err);
484
fprintf(stderr, "GnuTLS error: %s\n",
485
safer_gnutls_strerror(ret));
486
gnutls_deinit(*session);
487
return -1;
488
}
489
}
490
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
492
mc.cred);
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
495
safer_gnutls_strerror(ret));
496
gnutls_deinit(*session);
497
return -1;
498
}
499
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
500
286
/* ignore client certificate if any. */
501
gnutls_certificate_server_set_request(*session,
502
GNUTLS_CERT_IGNORE);
287
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
503
288
504
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
289
gnutls_dh_set_prime_bits (es->session, DH_BITS);
505
290
506
291
return 0;
507
292
}
508
293
509
/* Avahi log function callback */
510
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
511
__attribute__((unused)) const char *txt){}
294
void empty_log(AvahiLogLevel level, const char *txt){}
512
295
513
/* Called when a Mandos server is found */
514
static int start_mandos_communication(const char *ip, uint16_t port,
515
AvahiIfIndex if_index,
516
int af){
296
int start_mandos_communcation(char *ip, uint16_t port){
517
297
int ret, tcp_sd;
518
ssize_t sret;
519
union {
520
struct sockaddr_in in;
521
struct sockaddr_in6 in6;
522
} to;
298
struct sockaddr_in6 to;
299
struct in6_addr ip_addr;
300
encrypted_session es;
523
301
char *buffer = NULL;
524
302
char *decrypted_buffer;
525
303
size_t buffer_length = 0;
526
304
size_t buffer_capacity = 0;
527
305
ssize_t decrypted_buffer_size;
528
size_t written;
529
306
int retval = 0;
530
gnutls_session_t session;
531
int pf; /* Protocol family */
532
533
switch(af){
534
case AF_INET6:
535
pf = PF_INET6;
536
break;
537
case AF_INET:
538
pf = PF_INET;
539
break;
540
default:
541
fprintf(stderr, "Bad address family: %d\n", af);
542
return -1;
543
}
544
545
ret = init_gnutls_session(&session);
546
if(ret != 0){
547
return -1;
548
}
549
550
if(debug){
551
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
552
"\n", ip, port);
553
}
554
555
tcp_sd = socket(pf, SOCK_STREAM, 0);
556
if(tcp_sd < 0){
307
308
309
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
310
if(tcp_sd < 0) {
557
311
perror("socket");
558
312
return -1;
559
313
}
560
314
561
memset(&to, 0, sizeof(to));
562
if(af == AF_INET6){
563
to.in6.sin6_family = (uint16_t)af;
564
ret = inet_pton(af, ip, &to.in6.sin6_addr);
565
} else { /* IPv4 */
566
to.in.sin_family = (sa_family_t)af;
567
ret = inet_pton(af, ip, &to.in.sin_addr);
315
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);
316
if(tcp_sd < 0) {
317
perror("setsockopt bindtodevice");
318
return -1;
568
319
}
569
if(ret < 0 ){
320
321
memset(&to,0,sizeof(to));
322
to.sin6_family = AF_INET6;
323
ret = inet_pton(AF_INET6, ip, &ip_addr);
324
if (ret < 0 ){
570
325
perror("inet_pton");
571
326
return -1;
572
}
327
}
573
328
if(ret == 0){
574
329
fprintf(stderr, "Bad address: %s\n", ip);
575
330
return -1;
576
331
}
577
if(af == AF_INET6){
578
to.in6.sin6_port = htons(port); /* Spurious warnings from
579
-Wconversion and
580
-Wunreachable-code */
581
582
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
583
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
584
-Wunreachable-code*/
585
if(if_index == AVAHI_IF_UNSPEC){
586
fprintf(stderr, "An IPv6 link-local address is incomplete"
587
" without a network interface\n");
588
return -1;
589
}
590
/* Set the network interface number as scope */
591
to.in6.sin6_scope_id = (uint32_t)if_index;
592
}
593
} else {
594
to.in.sin_port = htons(port); /* Spurious warnings from
595
-Wconversion and
596
-Wunreachable-code */
597
}
598
599
if(debug){
600
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
601
char interface[IF_NAMESIZE];
602
if(if_indextoname((unsigned int)if_index, interface) == NULL){
603
perror("if_indextoname");
604
} else {
605
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
606
ip, interface, port);
607
}
608
} else {
609
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
610
port);
611
}
612
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
613
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
614
const char *pcret;
615
if(af == AF_INET6){
616
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
617
sizeof(addrstr));
618
} else {
619
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
620
sizeof(addrstr));
621
}
622
if(pcret == NULL){
623
perror("inet_ntop");
624
} else {
625
if(strcmp(addrstr, ip) != 0){
626
fprintf(stderr, "Canonical address form: %s\n", addrstr);
627
}
628
}
629
}
630
631
if(af == AF_INET6){
632
ret = connect(tcp_sd, &to.in6, sizeof(to));
633
} else {
634
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
635
}
636
if(ret < 0){
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));
336
if (ret < 0){
637
337
perror("connect");
638
338
return -1;
639
339
}
640
340
641
const char *out = mandos_protocol_version;
642
written = 0;
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
350
ret = gnutls_handshake (es.session);
351
352
if (ret != GNUTLS_E_SUCCESS){
353
fprintf(stderr, "\n*** Handshake failed ***\n");
354
gnutls_perror (ret);
355
retval = -1;
356
goto exit;
357
}
358
359
//retrive password
643
360
while(true){
644
size_t out_size = strlen(out);
645
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
646
out_size - written));
647
if(ret == -1){
648
perror("write");
649
retval = -1;
650
goto mandos_end;
651
}
652
written += (size_t)ret;
653
if(written < out_size){
654
continue;
655
} else {
656
if(out == mandos_protocol_version){
657
written = 0;
658
out = "\r\n";
659
} else {
660
break;
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;
661
366
}
662
}
663
}
664
665
if(debug){
666
fprintf(stderr, "Establishing TLS session with %s\n", ip);
667
}
668
669
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
670
671
do{
672
ret = gnutls_handshake(session);
673
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
674
675
if(ret != GNUTLS_E_SUCCESS){
676
if(debug){
677
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
678
gnutls_perror(ret);
679
}
680
retval = -1;
681
goto mandos_end;
682
}
683
684
/* Read OpenPGP packet that contains the wanted password */
685
686
if(debug){
687
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
688
ip);
689
}
690
691
while(true){
692
buffer_capacity = incbuffer(&buffer, buffer_length,
693
buffer_capacity);
694
if(buffer_capacity == 0){
695
perror("incbuffer");
696
retval = -1;
697
goto mandos_end;
367
buffer_capacity += BUFFER_SIZE;
698
368
}
699
369
700
sret = gnutls_record_recv(session, buffer+buffer_length,
701
BUFFER_SIZE);
702
if(sret == 0){
370
ret = gnutls_record_recv
371
(es.session, buffer+buffer_length, BUFFER_SIZE);
372
if (ret == 0){
703
373
break;
704
374
}
705
if(sret < 0){
706
switch(sret){
375
if (ret < 0){
376
switch(ret){
707
377
case GNUTLS_E_INTERRUPTED:
708
378
case GNUTLS_E_AGAIN:
709
379
break;
710
380
case GNUTLS_E_REHANDSHAKE:
711
do{
712
ret = gnutls_handshake(session);
713
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
714
if(ret < 0){
715
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
716
gnutls_perror(ret);
381
ret = gnutls_handshake (es.session);
382
if (ret < 0){
383
fprintf(stderr, "\n*** Handshake failed ***\n");
384
gnutls_perror (ret);
717
385
retval = -1;
718
goto mandos_end;
386
goto exit;
719
387
}
720
388
break;
721
389
default:
722
fprintf(stderr, "Unknown error while reading data from"
723
" encrypted session with Mandos server\n");
390
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
724
391
retval = -1;
725
gnutls_bye(session, GNUTLS_SHUT_RDWR);
726
goto mandos_end;
392
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
393
goto exit;
727
394
}
728
395
} else {
729
buffer_length += (size_t) sret;
396
buffer_length += ret;
730
397
}
731
398
}
732
733
if(debug){
734
fprintf(stderr, "Closing TLS session\n");
735
}
736
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
738
739
if(buffer_length > 0){
740
decrypted_buffer_size = pgp_packet_decrypt(buffer,
741
buffer_length,
742
&decrypted_buffer);
743
if(decrypted_buffer_size >= 0){
744
written = 0;
745
while(written < (size_t) decrypted_buffer_size){
746
ret = (int)fwrite(decrypted_buffer + written, 1,
747
(size_t)decrypted_buffer_size - written,
748
stdout);
749
if(ret == 0 and ferror(stdout)){
750
if(debug){
751
fprintf(stderr, "Error writing encrypted data: %s\n",
752
strerror(errno));
753
}
754
retval = -1;
755
break;
756
}
757
written += (size_t)ret;
758
}
399
400
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);
759
405
free(decrypted_buffer);
760
} else {
761
retval = -1;
762
406
}
763
} else {
764
retval = -1;
765
407
}
766
767
/* Shutdown procedure */
768
769
mandos_end:
408
770
409
free(buffer);
771
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
772
if(ret == -1){
773
perror("close");
774
}
775
gnutls_deinit(session);
410
411
//shutdown procedure
412
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
413
exit:
414
close(tcp_sd);
415
gnutls_deinit (es.session);
416
gnutls_certificate_free_credentials (es.cred);
417
gnutls_global_deinit ();
776
418
return retval;
777
419
}
778
420
779
static void resolve_callback(AvahiSServiceResolver *r,
780
AvahiIfIndex interface,
781
AvahiProtocol proto,
782
AvahiResolverEvent event,
783
const char *name,
784
const char *type,
785
const char *domain,
786
const char *host_name,
787
const AvahiAddress *address,
788
uint16_t port,
789
AVAHI_GCC_UNUSED AvahiStringList *txt,
790
AVAHI_GCC_UNUSED AvahiLookupResultFlags
791
flags,
792
AVAHI_GCC_UNUSED void* userdata){
793
assert(r);
794
795
/* Called whenever a service has been resolved successfully or
796
timed out */
797
798
switch(event){
799
default:
800
case AVAHI_RESOLVER_FAILURE:
801
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
802
" of type '%s' in domain '%s': %s\n", name, type, domain,
803
avahi_strerror(avahi_server_errno(mc.server)));
804
break;
805
806
case AVAHI_RESOLVER_FOUND:
807
{
808
char ip[AVAHI_ADDRESS_STR_MAX];
809
avahi_address_snprint(ip, sizeof(ip), address);
810
if(debug){
811
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
812
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
813
ip, (intmax_t)interface, port);
814
}
815
int ret = start_mandos_communication(ip, port, interface,
816
avahi_proto_to_af(proto));
817
if(ret == 0){
818
avahi_simple_poll_quit(mc.simple_poll);
819
}
820
}
821
}
822
avahi_s_service_resolver_free(r);
823
}
824
825
static void browse_callback(AvahiSServiceBrowser *b,
826
AvahiIfIndex interface,
827
AvahiProtocol protocol,
828
AvahiBrowserEvent event,
829
const char *name,
830
const char *type,
831
const char *domain,
832
AVAHI_GCC_UNUSED AvahiLookupResultFlags
833
flags,
834
AVAHI_GCC_UNUSED void* userdata){
835
assert(b);
836
837
/* Called whenever a new services becomes available on the LAN or
838
is removed from the LAN */
839
840
switch(event){
841
default:
842
case AVAHI_BROWSER_FAILURE:
843
844
fprintf(stderr, "(Avahi browser) %s\n",
845
avahi_strerror(avahi_server_errno(mc.server)));
846
avahi_simple_poll_quit(mc.simple_poll);
847
return;
848
849
case AVAHI_BROWSER_NEW:
850
/* We ignore the returned Avahi resolver object. In the callback
851
function we free it. If the Avahi server is terminated before
852
the callback function is called the Avahi server will free the
853
resolver for us. */
854
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
856
protocol, name, type, domain,
857
AVAHI_PROTO_INET6, 0,
858
resolve_callback, NULL)))
859
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
860
name, avahi_strerror(avahi_server_errno(mc.server)));
861
break;
862
863
case AVAHI_BROWSER_REMOVE:
864
break;
865
866
case AVAHI_BROWSER_ALL_FOR_NOW:
867
case AVAHI_BROWSER_CACHE_EXHAUSTED:
868
if(debug){
869
fprintf(stderr, "No Mandos server found, still searching...\n");
870
}
871
break;
872
}
873
}
874
875
sig_atomic_t quit_now = 0;
876
877
static void handle_sigterm(__attribute__((unused)) int sig){
878
if(quit_now){
879
return;
880
}
881
quit_now = 1;
882
int old_errno = errno;
883
if(mc.simple_poll != NULL){
884
avahi_simple_poll_quit(mc.simple_poll);
885
}
886
errno = old_errno;
887
}
888
889
int main(int argc, char *argv[]){
890
AvahiSServiceBrowser *sb = NULL;
891
int error;
892
int ret;
893
intmax_t tmpmax;
894
int numchars;
895
int exitcode = EXIT_SUCCESS;
896
const char *interface = "eth0";
897
struct ifreq network;
898
int sd;
899
uid_t uid;
900
gid_t gid;
901
char *connect_to = NULL;
902
char tempdir[] = "/tmp/mandosXXXXXX";
903
bool tempdir_created = false;
904
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
905
const char *seckey = PATHDIR "/" SECKEY;
906
const char *pubkey = PATHDIR "/" PUBKEY;
907
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
912
bool gnutls_initialized = false;
913
bool gpgme_initialized = false;
914
double delay = 2.5;
915
916
struct sigaction old_sigterm_action;
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
919
{
920
struct argp_option options[] = {
921
{ .name = "debug", .key = 128,
922
.doc = "Debug mode", .group = 3 },
923
{ .name = "connect", .key = 'c',
924
.arg = "ADDRESS:PORT",
925
.doc = "Connect directly to a specific Mandos server",
926
.group = 1 },
927
{ .name = "interface", .key = 'i',
928
.arg = "NAME",
929
.doc = "Network interface that will be used to search for"
930
" Mandos servers",
931
.group = 1 },
932
{ .name = "seckey", .key = 's',
933
.arg = "FILE",
934
.doc = "OpenPGP secret key file base name",
935
.group = 1 },
936
{ .name = "pubkey", .key = 'p',
937
.arg = "FILE",
938
.doc = "OpenPGP public key file base name",
939
.group = 2 },
940
{ .name = "dh-bits", .key = 129,
941
.arg = "BITS",
942
.doc = "Bit length of the prime number used in the"
943
" Diffie-Hellman key exchange",
944
.group = 2 },
945
{ .name = "priority", .key = 130,
946
.arg = "STRING",
947
.doc = "GnuTLS priority string for the TLS handshake",
948
.group = 1 },
949
{ .name = "delay", .key = 131,
950
.arg = "SECONDS",
951
.doc = "Maximum delay to wait for interface startup",
952
.group = 2 },
953
{ .name = NULL }
954
};
955
956
error_t parse_opt(int key, char *arg,
957
struct argp_state *state){
958
switch(key){
959
case 128: /* --debug */
960
debug = true;
961
break;
962
case 'c': /* --connect */
963
connect_to = arg;
964
break;
965
case 'i': /* --interface */
966
interface = arg;
967
break;
968
case 's': /* --seckey */
969
seckey = arg;
970
break;
971
case 'p': /* --pubkey */
972
pubkey = arg;
973
break;
974
case 129: /* --dh-bits */
975
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
978
fprintf(stderr, "Bad number of DH bits\n");
979
exit(EXIT_FAILURE);
980
}
981
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
982
break;
983
case 130: /* --priority */
984
mc.priority = arg;
985
break;
986
case 131: /* --delay */
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
996
break;
997
default:
998
return ARGP_ERR_UNKNOWN;
999
}
1000
return 0;
1001
}
1002
1003
struct argp argp = { .options = options, .parser = parse_opt,
1004
.args_doc = "",
1005
.doc = "Mandos client -- Get and decrypt"
1006
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
1013
}
1014
1015
/* If the interface is down, bring it up */
1016
if(interface[0] != '\0'){
1017
#ifdef __linux__
1018
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1019
messages to mess up the prompt */
1020
ret = klogctl(8, NULL, 5);
1021
bool restore_loglevel = true;
1022
if(ret == -1){
1023
restore_loglevel = false;
1024
perror("klogctl");
1025
}
1026
#endif /* __linux__ */
1027
1028
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1029
if(sd < 0){
1030
perror("socket");
1031
exitcode = EXIT_FAILURE;
1032
#ifdef __linux__
1033
if(restore_loglevel){
1034
ret = klogctl(7, NULL, 0);
1035
if(ret == -1){
1036
perror("klogctl");
1037
}
1038
}
1039
#endif /* __linux__ */
1040
goto end;
1041
}
1042
strcpy(network.ifr_name, interface);
1043
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1044
if(ret == -1){
1045
perror("ioctl SIOCGIFFLAGS");
1046
#ifdef __linux__
1047
if(restore_loglevel){
1048
ret = klogctl(7, NULL, 0);
1049
if(ret == -1){
1050
perror("klogctl");
1051
}
1052
}
1053
#endif /* __linux__ */
1054
exitcode = EXIT_FAILURE;
1055
goto end;
1056
}
1057
if((network.ifr_flags & IFF_UP) == 0){
1058
network.ifr_flags |= IFF_UP;
1059
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1060
if(ret == -1){
1061
perror("ioctl SIOCSIFFLAGS");
1062
exitcode = EXIT_FAILURE;
1063
#ifdef __linux__
1064
if(restore_loglevel){
1065
ret = klogctl(7, NULL, 0);
1066
if(ret == -1){
1067
perror("klogctl");
1068
}
1069
}
1070
#endif /* __linux__ */
1071
goto end;
1072
}
1073
}
1074
/* sleep checking until interface is running */
1075
for(int i=0; i < delay * 4; i++){
1076
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1077
if(ret == -1){
1078
perror("ioctl SIOCGIFFLAGS");
1079
} else if(network.ifr_flags & IFF_RUNNING){
1080
break;
1081
}
1082
struct timespec sleeptime = { .tv_nsec = 250000000 };
1083
ret = nanosleep(&sleeptime, NULL);
1084
if(ret == -1 and errno != EINTR){
1085
perror("nanosleep");
1086
}
1087
}
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1089
if(ret == -1){
1090
perror("close");
1091
}
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
/* Restores kernel loglevel to default */
1095
ret = klogctl(7, NULL, 0);
1096
if(ret == -1){
1097
perror("klogctl");
1098
}
1099
}
1100
#endif /* __linux__ */
1101
}
1102
1103
uid = getuid();
1104
gid = getgid();
1105
1106
errno = 0;
1107
setgid(gid);
1108
if(ret == -1){
1109
perror("setgid");
1110
}
1111
1112
ret = setuid(uid);
1113
if(ret == -1){
1114
perror("setuid");
1115
}
1116
1117
ret = init_gnutls_global(pubkey, seckey);
1118
if(ret == -1){
1119
fprintf(stderr, "init_gnutls_global failed\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
} else {
1123
gnutls_initialized = true;
1124
}
1125
1126
if(mkdtemp(tempdir) == NULL){
1127
perror("mkdtemp");
1128
goto end;
1129
}
1130
tempdir_created = true;
1131
1132
if(not init_gpgme(pubkey, seckey, tempdir)){
1133
fprintf(stderr, "init_gpgme failed\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
} else {
1137
gpgme_initialized = true;
1138
}
1139
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1142
if(if_index == 0){
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
}
1148
1149
if(connect_to != NULL){
1150
/* Connect directly, do not use Zeroconf */
1151
/* (Mainly meant for debugging) */
1152
char *address = strrchr(connect_to, ':');
1153
if(address == NULL){
1154
fprintf(stderr, "No colon in address\n");
1155
exitcode = EXIT_FAILURE;
1156
goto end;
1157
}
1158
uint16_t port;
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1162
fprintf(stderr, "Bad port number\n");
1163
exitcode = EXIT_FAILURE;
1164
goto end;
1165
}
1166
port = (uint16_t)tmpmax;
1167
*address = '\0';
1168
address = connect_to;
1169
/* Colon in address indicates IPv6 */
1170
int af;
1171
if(strchr(address, ':') != NULL){
1172
af = AF_INET6;
1173
} else {
1174
af = AF_INET;
1175
}
1176
ret = start_mandos_communication(address, port, if_index, af);
1177
if(ret < 0){
1178
exitcode = EXIT_FAILURE;
1179
} else {
1180
exitcode = EXIT_SUCCESS;
1181
}
1182
goto end;
1183
}
1184
1185
if(not debug){
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;
508
AvahiSServiceBrowser *sb = NULL;
509
int error;
510
int ret = 1;
511
1186
512
avahi_set_log_function(empty_log);
1187
}
1188
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1191
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
1200
{
1201
AvahiServerConfig config;
1202
/* Do not publish any local Zeroconf records */
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 */
1203
524
avahi_server_config_init(&config);
1204
525
config.publish_hinfo = 0;
1205
526
config.publish_addresses = 0;
1206
527
config.publish_workstation = 0;
1207
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; */
1208
534
1209
535
/* Allocate a new server */
1210
mc.server = avahi_server_new(avahi_simple_poll_get
1211
(mc.simple_poll), &config, NULL,
1212
NULL, &error);
1213
1214
/* Free the Avahi configuration data */
536
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
537
538
/* Free the configuration data */
1215
539
avahi_server_config_free(&config);
1216
}
1217
1218
/* Check if creating the Avahi server object succeeded */
1219
if(mc.server == NULL){
1220
fprintf(stderr, "Failed to create Avahi server: %s\n",
1221
avahi_strerror(error));
1222
exitcode = EXIT_FAILURE;
1223
goto end;
1224
}
1225
1226
/* Create the Avahi service browser */
1227
sb = avahi_s_service_browser_new(mc.server, if_index,
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1229
NULL, 0, browse_callback, NULL);
1230
if(sb == NULL){
1231
fprintf(stderr, "Failed to create service browser: %s\n",
1232
avahi_strerror(avahi_server_errno(mc.server)));
1233
exitcode = EXIT_FAILURE;
1234
goto end;
1235
}
1236
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1239
if(ret == -1){
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1242
goto end;
1243
}
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1245
if(ret == -1){
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1248
goto end;
1249
}
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1251
if(ret == -1){
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1257
if(ret == -1){
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1262
1263
/* Run the main loop */
1264
1265
if(debug){
1266
fprintf(stderr, "Starting Avahi loop search\n");
1267
}
1268
1269
avahi_simple_poll_loop(mc.simple_poll);
1270
1271
end:
1272
1273
if(debug){
1274
fprintf(stderr, "%s exiting\n", argv[0]);
1275
}
1276
1277
/* Cleanup things */
1278
if(sb != NULL)
1279
avahi_s_service_browser_free(sb);
1280
1281
if(mc.server != NULL)
1282
avahi_server_free(mc.server);
1283
1284
if(mc.simple_poll != NULL)
1285
avahi_simple_poll_free(mc.simple_poll);
1286
1287
if(gnutls_initialized){
1288
gnutls_certificate_free_credentials(mc.cred);
1289
gnutls_global_deinit();
1290
gnutls_dh_params_deinit(mc.dh_params);
1291
}
1292
1293
if(gpgme_initialized){
1294
gpgme_release(mc.ctx);
1295
}
1296
1297
/* Removes the temp directory used by GPGME */
1298
if(tempdir_created){
1299
DIR *d;
1300
struct dirent *direntry;
1301
d = opendir(tempdir);
1302
if(d == NULL){
1303
if(errno != ENOENT){
1304
perror("opendir");
1305
}
1306
} else {
1307
while(true){
1308
direntry = readdir(d);
1309
if(direntry == NULL){
1310
break;
1311
}
1312
/* Skip "." and ".." */
1313
if(direntry->d_name[0] == '.'
1314
and (direntry->d_name[1] == '\0'
1315
or (direntry->d_name[1] == '.'
1316
and direntry->d_name[2] == '\0'))){
1317
continue;
1318
}
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", tempdir,
1321
direntry->d_name);
1322
if(ret < 0){
1323
perror("asprintf");
1324
continue;
1325
}
1326
ret = remove(fullname);
1327
if(ret == -1){
1328
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1329
strerror(errno));
1330
}
1331
free(fullname);
1332
}
1333
closedir(d);
1334
}
1335
ret = rmdir(tempdir);
1336
if(ret == -1 and errno != ENOENT){
1337
perror("rmdir");
1338
}
1339
}
1340
1341
return exitcode;
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;
551
}
552
553
/* Run the main loop */
554
avahi_simple_poll_loop(simple_poll);
555
556
ret = 0;
557
558
fail:
559
560
/* Cleanup things */
561
if (sb)
562
avahi_s_service_browser_free(sb);
563
564
if (server)
565
avahi_server_free(server);
566
567
if (simple_poll)
568
avahi_simple_poll_free(simple_poll);
569
570
return ret;
1342
571
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0