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- Committer: Teddy Hogeborn
- Date: 2009-02-12 19:08:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20090212190835-dqv0piw2u254d0jc
* plugin-runner.c: Whitespace changes only.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
8
8
* includes the following functions: "resolve_callback",
9
9
* "browse_callback", and parts of "main".
10
10
*
11
* Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
12
* Påhlsson.
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
#define _FORTIFY_SOURCE 2
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#define _LARGEFILE_SOURCE
35
34
#define _FILE_OFFSET_BITS 64
36
35
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), remove() */
40
#include <stdint.h> /* uint16_t, uint32_t */
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
44
#include <stdbool.h> /* bool, false, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, uid_t, gid_t, open(),
51
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
inet_pton(), connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir()
57
*/
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
strtoimax() */
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_* */
43
90
#include <avahi-core/core.h>
44
91
#include <avahi-core/lookup.h>
45
92
#include <avahi-core/log.h>
47
94
#include <avahi-common/malloc.h>
48
95
#include <avahi-common/error.h>
49
96
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt long
69
#include <getopt.h>
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_* */
70
113
71
114
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
115
74
const char *certdir = "/conf/conf.d/cryptkeyreq/";
75
const char *certfile = "openpgp-client.txt";
76
const char *certkey = "openpgp-client-key.txt";
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
77
119
78
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>";
79
124
125
/* Used for passing in values through the Avahi callback functions */
80
126
typedef struct {
81
gnutls_session_t session;
127
AvahiSimplePoll *simple_poll;
128
AvahiServer *server;
82
129
gnutls_certificate_credentials_t cred;
130
unsigned int dh_bits;
83
131
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
89
gpgme_data_t dh_crypto, dh_plain;
132
const char *priority;
90
133
gpgme_ctx_t ctx;
134
} mandos_context;
135
136
/* global context so signal handler can reach it*/
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
140
141
/*
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
* bytes. "buffer_capacity" is how much is currently allocated,
144
* "buffer_length" is how much is already used.
145
*/
146
size_t incbuffer(char **buffer, size_t buffer_length,
147
size_t buffer_capacity){
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
if(buffer == NULL){
151
return 0;
152
}
153
buffer_capacity += BUFFER_SIZE;
154
}
155
return buffer_capacity;
156
}
157
158
/*
159
* Initialize GPGME.
160
*/
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
91
164
gpgme_error_t rc;
92
ssize_t ret;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
95
165
gpgme_engine_info_t engine_info;
96
97
if (debug){
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
166
167
168
/*
169
* Helper function to insert pub and seckey to the engine keyring.
170
*/
171
bool import_key(const char *filename){
172
int fd;
173
gpgme_data_t pgp_data;
174
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
if(fd == -1){
177
perror("open");
178
return false;
179
}
180
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
185
return false;
186
}
187
188
rc = gpgme_op_import(mc.ctx, pgp_data);
189
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
192
return false;
193
}
194
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
if(ret == -1){
197
perror("close");
198
}
199
gpgme_data_release(pgp_data);
200
return true;
201
}
202
203
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
99
205
}
100
206
101
207
/* Init GPGME */
102
208
gpgme_check_version(NULL);
103
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
104
if (rc != GPG_ERR_NO_ERROR){
210
if(rc != GPG_ERR_NO_ERROR){
105
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
106
212
gpgme_strsource(rc), gpgme_strerror(rc));
107
return -1;
213
return false;
108
214
}
109
215
110
/* Set GPGME home directory */
111
rc = gpgme_get_engine_info (&engine_info);
112
if (rc != GPG_ERR_NO_ERROR){
216
/* Set GPGME home directory for the OpenPGP engine only */
217
rc = gpgme_get_engine_info(&engine_info);
218
if(rc != GPG_ERR_NO_ERROR){
113
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
114
220
gpgme_strsource(rc), gpgme_strerror(rc));
115
return -1;
221
return false;
116
222
}
117
223
while(engine_info != NULL){
118
224
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
119
225
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
120
engine_info->file_name, homedir);
226
engine_info->file_name, tempdir);
121
227
break;
122
228
}
123
229
engine_info = engine_info->next;
124
230
}
125
231
if(engine_info == NULL){
126
fprintf(stderr, "Could not set home dir to %s\n", homedir);
127
return -1;
128
}
129
130
/* Create new GPGME data buffer from packet buffer */
131
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
132
if (rc != GPG_ERR_NO_ERROR){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
233
return false;
234
}
235
236
/* Create new GPGME "context" */
237
rc = gpgme_new(&(mc.ctx));
238
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
241
return false;
242
}
243
244
if(not import_key(pubkey) or not import_key(seckey)){
245
return false;
246
}
247
248
return true;
249
}
250
251
/*
252
* Decrypt OpenPGP data.
253
* Returns -1 on error
254
*/
255
static ssize_t pgp_packet_decrypt(const char *cryptotext,
256
size_t crypto_size,
257
char **plaintext){
258
gpgme_data_t dh_crypto, dh_plain;
259
gpgme_error_t rc;
260
ssize_t ret;
261
size_t plaintext_capacity = 0;
262
ssize_t plaintext_length = 0;
263
264
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
266
}
267
268
/* Create new GPGME data buffer from memory cryptotext */
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
0);
271
if(rc != GPG_ERR_NO_ERROR){
133
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
134
273
gpgme_strsource(rc), gpgme_strerror(rc));
135
274
return -1;
137
276
138
277
/* Create new empty GPGME data buffer for the plaintext */
139
278
rc = gpgme_data_new(&dh_plain);
140
if (rc != GPG_ERR_NO_ERROR){
279
if(rc != GPG_ERR_NO_ERROR){
141
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
142
281
gpgme_strsource(rc), gpgme_strerror(rc));
143
return -1;
144
}
145
146
/* Create new GPGME "context" */
147
rc = gpgme_new(&ctx);
148
if (rc != GPG_ERR_NO_ERROR){
149
fprintf(stderr, "bad gpgme_new: %s: %s\n",
150
gpgme_strsource(rc), gpgme_strerror(rc));
151
return -1;
152
}
153
154
/* Decrypt data from the FILE pointer to the plaintext data
155
buffer */
156
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
157
if (rc != GPG_ERR_NO_ERROR){
282
gpgme_data_release(dh_crypto);
283
return -1;
284
}
285
286
/* Decrypt data from the cryptotext data buffer to the plaintext
287
data buffer */
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
if(rc != GPG_ERR_NO_ERROR){
158
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
159
291
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
292
plaintext_length = -1;
293
if(debug){
294
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
296
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
298
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
303
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
305
}
306
gpgme_recipient_t recipient;
307
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
318
}
319
}
320
}
321
goto decrypt_end;
161
322
}
162
323
163
324
if(debug){
164
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
165
}
166
167
if (debug){
168
gpgme_decrypt_result_t result;
169
result = gpgme_op_decrypt_result(ctx);
170
if (result == NULL){
171
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
172
} else {
173
fprintf(stderr, "Unsupported algorithm: %s\n",
174
result->unsupported_algorithm);
175
fprintf(stderr, "Wrong key usage: %d\n",
176
result->wrong_key_usage);
177
if(result->file_name != NULL){
178
fprintf(stderr, "File name: %s\n", result->file_name);
179
}
180
gpgme_recipient_t recipient;
181
recipient = result->recipients;
182
if(recipient){
183
while(recipient != NULL){
184
fprintf(stderr, "Public key algorithm: %s\n",
185
gpgme_pubkey_algo_name(recipient->pubkey_algo));
186
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
187
fprintf(stderr, "Secret key available: %s\n",
188
recipient->status == GPG_ERR_NO_SECKEY
189
? "No" : "Yes");
190
recipient = recipient->next;
191
}
192
}
193
}
194
}
195
196
/* Delete the GPGME FILE pointer cryptotext data buffer */
197
gpgme_data_release(dh_crypto);
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
326
}
198
327
199
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
200
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
201
202
*new_packet = 0;
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
331
plaintext_length = -1;
332
goto decrypt_end;
333
}
334
335
*plaintext = NULL;
203
336
while(true){
204
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
205
*new_packet = realloc(*new_packet,
206
(unsigned int)new_packet_capacity
207
+ BUFFER_SIZE);
208
if (*new_packet == NULL){
209
perror("realloc");
210
return -1;
211
}
212
new_packet_capacity += BUFFER_SIZE;
337
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
339
plaintext_capacity);
340
if(plaintext_capacity == 0){
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
213
344
}
214
345
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
347
BUFFER_SIZE);
217
348
/* Print the data, if any */
218
if (ret == 0){
349
if(ret == 0){
350
/* EOF */
219
351
break;
220
352
}
221
353
if(ret < 0){
222
354
perror("gpgme_data_read");
223
return -1;
224
}
225
new_packet_length += ret;
226
}
227
228
/* FIXME: check characters before printing to screen so to not print
229
terminal control characters */
230
/* if(debug){ */
231
/* fprintf(stderr, "decrypted password is: "); */
232
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
233
/* fprintf(stderr, "\n"); */
234
/* } */
355
plaintext_length = -1;
356
goto decrypt_end;
357
}
358
plaintext_length += ret;
359
}
360
361
if(debug){
362
fprintf(stderr, "Decrypted password is: ");
363
for(ssize_t i = 0; i < plaintext_length; i++){
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
365
}
366
fprintf(stderr, "\n");
367
}
368
369
decrypt_end:
370
371
/* Delete the GPGME cryptotext data buffer */
372
gpgme_data_release(dh_crypto);
235
373
236
374
/* Delete the GPGME plaintext data buffer */
237
375
gpgme_data_release(dh_plain);
238
return new_packet_length;
376
return plaintext_length;
239
377
}
240
378
241
static const char * safer_gnutls_strerror (int value) {
242
const char *ret = gnutls_strerror (value);
243
if (ret == NULL)
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
382
if(ret == NULL)
244
383
ret = "(unknown)";
245
384
return ret;
246
385
}
247
386
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
387
/* GnuTLS log function callback */
388
static void debuggnutls(__attribute__((unused)) int level,
389
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
251
391
}
252
392
253
int initgnutls(encrypted_session *es){
254
const char *err;
393
static int init_gnutls_global(const char *pubkeyfilename,
394
const char *seckeyfilename){
255
395
int ret;
256
396
257
397
if(debug){
258
398
fprintf(stderr, "Initializing GnuTLS\n");
259
399
}
260
261
if ((ret = gnutls_global_init ())
262
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
400
401
ret = gnutls_global_init();
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
264
405
return -1;
265
406
}
266
267
if (debug){
407
408
if(debug){
409
/* "Use a log level over 10 to enable all debugging options."
410
* - GnuTLS manual
411
*/
268
412
gnutls_global_set_log_level(11);
269
413
gnutls_global_set_log_function(debuggnutls);
270
414
}
271
415
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
274
!= GNUTLS_E_SUCCESS) {
275
fprintf (stderr, "memory error: %s\n",
276
safer_gnutls_strerror(ret));
416
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
418
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
424
gnutls_global_deinit();
277
425
return -1;
278
426
}
279
427
280
428
if(debug){
281
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
seckeyfilename);
284
432
}
285
433
286
434
ret = gnutls_certificate_set_openpgp_key_file
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
288
if (ret != GNUTLS_E_SUCCESS) {
289
fprintf
290
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
291
" '%s')\n",
292
ret, certfile, certkey);
293
fprintf(stdout, "The Error is: %s\n",
294
safer_gnutls_strerror(ret));
295
return -1;
296
}
297
298
//GnuTLS server initialization
299
if ((ret = gnutls_dh_params_init (&es->dh_params))
300
!= GNUTLS_E_SUCCESS) {
301
fprintf (stderr, "Error in dh parameter initialization: %s\n",
302
safer_gnutls_strerror(ret));
303
return -1;
304
}
305
306
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
307
!= GNUTLS_E_SUCCESS) {
308
fprintf (stderr, "Error in prime generation: %s\n",
309
safer_gnutls_strerror(ret));
310
return -1;
311
}
312
313
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
314
315
// GnuTLS session creation
316
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
317
!= GNUTLS_E_SUCCESS){
435
(mc.cred, pubkeyfilename, seckeyfilename,
436
GNUTLS_OPENPGP_FMT_BASE64);
437
if(ret != GNUTLS_E_SUCCESS){
438
fprintf(stderr,
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
443
goto globalfail;
444
}
445
446
/* GnuTLS server initialization */
447
ret = gnutls_dh_params_init(&mc.dh_params);
448
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
451
goto globalfail;
452
}
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
457
goto globalfail;
458
}
459
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
461
462
return 0;
463
464
globalfail:
465
466
gnutls_certificate_free_credentials(mc.cred);
467
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
469
return -1;
470
}
471
472
static int init_gnutls_session(gnutls_session_t *session){
473
int ret;
474
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
476
if(ret != GNUTLS_E_SUCCESS){
318
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
478
safer_gnutls_strerror(ret));
320
479
}
321
480
322
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf(stderr, "Syntax error at: %s\n", err);
325
fprintf(stderr, "GnuTLS error: %s\n",
326
safer_gnutls_strerror(ret));
327
return -1;
481
{
482
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
484
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
489
return -1;
490
}
328
491
}
329
492
330
if ((ret = gnutls_credentials_set
331
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
332
!= GNUTLS_E_SUCCESS) {
333
fprintf(stderr, "Error setting a credentials set: %s\n",
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
497
safer_gnutls_strerror(ret));
498
gnutls_deinit(*session);
335
499
return -1;
336
500
}
337
501
338
502
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
340
GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
341
505
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
343
507
344
508
return 0;
345
509
}
346
510
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
511
/* Avahi log function callback */
512
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
513
__attribute__((unused)) const char *txt){}
349
514
350
int start_mandos_communication(const char *ip, uint16_t port,
351
unsigned int if_index){
515
/* Called when a Mandos server is found */
516
static int start_mandos_communication(const char *ip, uint16_t port,
517
AvahiIfIndex if_index,
518
int af){
352
519
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
520
ssize_t sret;
521
union {
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
524
} to;
355
525
char *buffer = NULL;
356
526
char *decrypted_buffer;
357
527
size_t buffer_length = 0;
358
528
size_t buffer_capacity = 0;
359
529
ssize_t decrypted_buffer_size;
360
size_t written = 0;
530
size_t written;
361
531
int retval = 0;
362
char interface[IF_NAMESIZE];
532
gnutls_session_t session;
533
int pf; /* Protocol family */
534
535
switch(af){
536
case AF_INET6:
537
pf = PF_INET6;
538
break;
539
case AF_INET:
540
pf = PF_INET;
541
break;
542
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
544
return -1;
545
}
546
547
ret = init_gnutls_session(&session);
548
if(ret != 0){
549
return -1;
550
}
363
551
364
552
if(debug){
365
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
554
"\n", ip, port);
366
555
}
367
556
368
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
369
if(tcp_sd < 0) {
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
if(tcp_sd < 0){
370
559
perror("socket");
371
560
return -1;
372
561
}
373
562
374
if(if_indextoname(if_index, interface) == NULL){
375
if(debug){
376
perror("if_indextoname");
377
}
378
return -1;
379
}
380
381
if(debug){
382
fprintf(stderr, "Binding to interface %s\n", interface);
383
}
384
385
memset(&to,0,sizeof(to)); /* Spurious warning */
386
to.sin6_family = AF_INET6;
387
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
388
if (ret < 0 ){
563
memset(&to, 0, sizeof(to));
564
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
} else { /* IPv4 */
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
570
}
571
if(ret < 0 ){
389
572
perror("inet_pton");
390
573
return -1;
391
}
574
}
392
575
if(ret == 0){
393
576
fprintf(stderr, "Bad address: %s\n", ip);
394
577
return -1;
395
578
}
396
to.sin6_port = htons(port); /* Spurious warning */
397
398
to.sin6_scope_id = (uint32_t)if_index;
579
if(af == AF_INET6){
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
-Wconversion and
582
-Wunreachable-code */
583
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
587
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
591
}
592
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
594
}
595
} else {
596
to.in.sin_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
}
399
600
400
601
if(debug){
401
fprintf(stderr, "Connection to: %s\n", ip);
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
char interface[IF_NAMESIZE];
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
606
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
609
}
610
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
613
}
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
const char *pcret;
617
if(af == AF_INET6){
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
619
sizeof(addrstr));
620
} else {
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
622
sizeof(addrstr));
623
}
624
if(pcret == NULL){
625
perror("inet_ntop");
626
} else {
627
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
629
}
630
}
402
631
}
403
632
404
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
405
if (ret < 0){
633
if(af == AF_INET6){
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
} else {
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
}
638
if(ret < 0){
406
639
perror("connect");
407
640
return -1;
408
641
}
409
642
410
ret = initgnutls (&es);
411
if (ret != 0){
412
retval = -1;
413
return -1;
643
const char *out = mandos_protocol_version;
644
written = 0;
645
while(true){
646
size_t out_size = strlen(out);
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
out_size - written));
649
if(ret == -1){
650
perror("write");
651
retval = -1;
652
goto mandos_end;
653
}
654
written += (size_t)ret;
655
if(written < out_size){
656
continue;
657
} else {
658
if(out == mandos_protocol_version){
659
written = 0;
660
out = "\r\n";
661
} else {
662
break;
663
}
664
}
414
665
}
415
666
416
gnutls_transport_set_ptr (es.session,
417
(gnutls_transport_ptr_t) tcp_sd);
418
419
667
if(debug){
420
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
421
669
}
422
670
423
ret = gnutls_handshake (es.session);
424
425
if (ret != GNUTLS_E_SUCCESS){
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
673
do{
674
ret = gnutls_handshake(session);
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
677
if(ret != GNUTLS_E_SUCCESS){
426
678
if(debug){
427
fprintf(stderr, "\n*** Handshake failed ***\n");
428
gnutls_perror (ret);
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
gnutls_perror(ret);
429
681
}
430
682
retval = -1;
431
goto exit;
683
goto mandos_end;
432
684
}
433
685
434
//Retrieve OpenPGP packet that contains the wanted password
686
/* Read OpenPGP packet that contains the wanted password */
435
687
436
688
if(debug){
437
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
438
690
ip);
439
691
}
440
692
441
693
while(true){
442
if (buffer_length + BUFFER_SIZE > buffer_capacity){
443
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
444
if (buffer == NULL){
445
perror("realloc");
446
goto exit;
447
}
448
buffer_capacity += BUFFER_SIZE;
694
buffer_capacity = incbuffer(&buffer, buffer_length,
695
buffer_capacity);
696
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
699
goto mandos_end;
449
700
}
450
701
451
ret = gnutls_record_recv
452
(es.session, buffer+buffer_length, BUFFER_SIZE);
453
if (ret == 0){
702
sret = gnutls_record_recv(session, buffer+buffer_length,
703
BUFFER_SIZE);
704
if(sret == 0){
454
705
break;
455
706
}
456
if (ret < 0){
457
switch(ret){
707
if(sret < 0){
708
switch(sret){
458
709
case GNUTLS_E_INTERRUPTED:
459
710
case GNUTLS_E_AGAIN:
460
711
break;
461
712
case GNUTLS_E_REHANDSHAKE:
462
ret = gnutls_handshake (es.session);
463
if (ret < 0){
464
fprintf(stderr, "\n*** Handshake failed ***\n");
465
gnutls_perror (ret);
713
do{
714
ret = gnutls_handshake(session);
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
if(ret < 0){
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
718
gnutls_perror(ret);
466
719
retval = -1;
467
goto exit;
720
goto mandos_end;
468
721
}
469
722
break;
470
723
default:
471
724
fprintf(stderr, "Unknown error while reading data from"
472
" encrypted session with mandos server\n");
725
" encrypted session with Mandos server\n");
473
726
retval = -1;
474
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
475
goto exit;
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
728
goto mandos_end;
476
729
}
477
730
} else {
478
buffer_length += (size_t) ret;
731
buffer_length += (size_t) sret;
479
732
}
480
733
}
481
734
482
if (buffer_length > 0){
735
if(debug){
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
740
741
if(buffer_length > 0){
483
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
484
743
buffer_length,
485
&decrypted_buffer,
486
certdir);
487
if (decrypted_buffer_size >= 0){
488
while(written < decrypted_buffer_size){
489
ret = (int)fwrite (decrypted_buffer + written, 1,
490
(size_t)decrypted_buffer_size - written,
491
stdout);
744
&decrypted_buffer);
745
if(decrypted_buffer_size >= 0){
746
written = 0;
747
while(written < (size_t) decrypted_buffer_size){
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
750
stdout);
492
751
if(ret == 0 and ferror(stdout)){
493
752
if(debug){
494
753
fprintf(stderr, "Error writing encrypted data: %s\n",
503
762
} else {
504
763
retval = -1;
505
764
}
506
}
507
508
//shutdown procedure
509
510
if(debug){
511
fprintf(stderr, "Closing TLS session\n");
512
}
513
765
} else {
766
retval = -1;
767
}
768
769
/* Shutdown procedure */
770
771
mandos_end:
514
772
free(buffer);
515
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
516
exit:
517
close(tcp_sd);
518
gnutls_deinit (es.session);
519
gnutls_certificate_free_credentials (es.cred);
520
gnutls_global_deinit ();
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
776
}
777
gnutls_deinit(session);
521
778
return retval;
522
779
}
523
780
524
static AvahiSimplePoll *simple_poll = NULL;
525
static AvahiServer *server = NULL;
526
527
static void resolve_callback(
528
AvahiSServiceResolver *r,
529
AvahiIfIndex interface,
530
AVAHI_GCC_UNUSED AvahiProtocol protocol,
531
AvahiResolverEvent event,
532
const char *name,
533
const char *type,
534
const char *domain,
535
const char *host_name,
536
const AvahiAddress *address,
537
uint16_t port,
538
AVAHI_GCC_UNUSED AvahiStringList *txt,
539
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
540
AVAHI_GCC_UNUSED void* userdata) {
541
542
assert(r); /* Spurious warning */
781
static void resolve_callback(AvahiSServiceResolver *r,
782
AvahiIfIndex interface,
783
AvahiProtocol proto,
784
AvahiResolverEvent event,
785
const char *name,
786
const char *type,
787
const char *domain,
788
const char *host_name,
789
const AvahiAddress *address,
790
uint16_t port,
791
AVAHI_GCC_UNUSED AvahiStringList *txt,
792
AVAHI_GCC_UNUSED AvahiLookupResultFlags
793
flags,
794
AVAHI_GCC_UNUSED void* userdata){
795
assert(r);
543
796
544
797
/* Called whenever a service has been resolved successfully or
545
798
timed out */
546
799
547
switch (event) {
800
switch(event){
548
801
default:
549
802
case AVAHI_RESOLVER_FAILURE:
550
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
551
" type '%s' in domain '%s': %s\n", name, type, domain,
552
avahi_strerror(avahi_server_errno(server)));
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
553
806
break;
554
807
555
808
case AVAHI_RESOLVER_FOUND:
557
810
char ip[AVAHI_ADDRESS_STR_MAX];
558
811
avahi_address_snprint(ip, sizeof(ip), address);
559
812
if(debug){
560
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
561
" port %d\n", name, host_name, ip, port);
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
562
816
}
563
int ret = start_mandos_communication(ip, port,
564
(unsigned int) interface);
565
if (ret == 0){
566
exit(EXIT_SUCCESS);
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
819
if(ret == 0){
820
avahi_simple_poll_quit(mc.simple_poll);
567
821
}
568
822
}
569
823
}
570
824
avahi_s_service_resolver_free(r);
571
825
}
572
826
573
static void browse_callback(
574
AvahiSServiceBrowser *b,
575
AvahiIfIndex interface,
576
AvahiProtocol protocol,
577
AvahiBrowserEvent event,
578
const char *name,
579
const char *type,
580
const char *domain,
581
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
582
void* userdata) {
583
584
AvahiServer *s = userdata;
585
assert(b); /* Spurious warning */
586
587
/* Called whenever a new services becomes available on the LAN or
588
is removed from the LAN */
589
590
switch (event) {
591
default:
592
case AVAHI_BROWSER_FAILURE:
593
594
fprintf(stderr, "(Browser) %s\n",
595
avahi_strerror(avahi_server_errno(server)));
596
avahi_simple_poll_quit(simple_poll);
597
return;
598
599
case AVAHI_BROWSER_NEW:
600
/* We ignore the returned resolver object. In the callback
601
function we free it. If the server is terminated before
602
the callback function is called the server will free
603
the resolver for us. */
604
605
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
606
type, domain,
607
AVAHI_PROTO_INET6, 0,
608
resolve_callback, s)))
609
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
610
avahi_strerror(avahi_server_errno(s)));
611
break;
612
613
case AVAHI_BROWSER_REMOVE:
614
break;
615
616
case AVAHI_BROWSER_ALL_FOR_NOW:
617
case AVAHI_BROWSER_CACHE_EXHAUSTED:
618
break;
827
static void browse_callback(AvahiSServiceBrowser *b,
828
AvahiIfIndex interface,
829
AvahiProtocol protocol,
830
AvahiBrowserEvent event,
831
const char *name,
832
const char *type,
833
const char *domain,
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
835
flags,
836
AVAHI_GCC_UNUSED void* userdata){
837
assert(b);
838
839
/* Called whenever a new services becomes available on the LAN or
840
is removed from the LAN */
841
842
switch(event){
843
default:
844
case AVAHI_BROWSER_FAILURE:
845
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
849
return;
850
851
case AVAHI_BROWSER_NEW:
852
/* We ignore the returned Avahi resolver object. In the callback
853
function we free it. If the Avahi server is terminated before
854
the callback function is called the Avahi server will free the
855
resolver for us. */
856
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
name, avahi_strerror(avahi_server_errno(mc.server)));
863
break;
864
865
case AVAHI_BROWSER_REMOVE:
866
break;
867
868
case AVAHI_BROWSER_ALL_FOR_NOW:
869
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
if(debug){
871
fprintf(stderr, "No Mandos server found, still searching...\n");
619
872
}
620
}
621
622
/* combinds two strings and returns the malloced new string. som sane checks could/should be added */
623
const char *combinestrings(const char *first, const char *second){
873
break;
874
}
875
}
876
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
881
if(quit_now){
882
return;
883
}
884
quit_now = 1;
885
int old_errno = errno;
886
if(mc.simple_poll != NULL){
887
avahi_simple_poll_quit(mc.simple_poll);
888
}
889
errno = old_errno;
890
}
891
892
int main(int argc, char *argv[]){
893
AvahiSServiceBrowser *sb = NULL;
894
int error;
895
int ret;
896
intmax_t tmpmax;
624
897
char *tmp;
625
tmp = malloc(strlen(first) + strlen(second));
626
if (tmp == NULL){
627
perror("malloc");
628
return NULL;
629
}
630
strcpy(tmp, first);
631
strcat(tmp, second);
632
return tmp;
633
}
634
635
636
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
898
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
900
struct ifreq network;
901
int sd;
902
uid_t uid;
903
gid_t gid;
904
char *connect_to = NULL;
905
char tempdir[] = "/tmp/mandosXXXXXX";
906
bool tempdir_created = false;
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
const char *seckey = PATHDIR "/" SECKEY;
909
const char *pubkey = PATHDIR "/" PUBKEY;
910
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
915
bool gnutls_initialized = false;
916
bool gpgme_initialized = false;
917
float delay = 2.5f;
918
919
struct sigaction old_sigterm_action;
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
922
{
923
struct argp_option options[] = {
924
{ .name = "debug", .key = 128,
925
.doc = "Debug mode", .group = 3 },
926
{ .name = "connect", .key = 'c',
927
.arg = "ADDRESS:PORT",
928
.doc = "Connect directly to a specific Mandos server",
929
.group = 1 },
930
{ .name = "interface", .key = 'i',
931
.arg = "NAME",
932
.doc = "Network interface that will be used to search for"
933
" Mandos servers",
934
.group = 1 },
935
{ .name = "seckey", .key = 's',
936
.arg = "FILE",
937
.doc = "OpenPGP secret key file base name",
938
.group = 1 },
939
{ .name = "pubkey", .key = 'p',
940
.arg = "FILE",
941
.doc = "OpenPGP public key file base name",
942
.group = 2 },
943
{ .name = "dh-bits", .key = 129,
944
.arg = "BITS",
945
.doc = "Bit length of the prime number used in the"
946
" Diffie-Hellman key exchange",
947
.group = 2 },
948
{ .name = "priority", .key = 130,
949
.arg = "STRING",
950
.doc = "GnuTLS priority string for the TLS handshake",
951
.group = 1 },
952
{ .name = "delay", .key = 131,
953
.arg = "SECONDS",
954
.doc = "Maximum delay to wait for interface startup",
955
.group = 2 },
956
{ .name = NULL }
957
};
958
959
error_t parse_opt(int key, char *arg,
960
struct argp_state *state){
961
switch(key){
962
case 128: /* --debug */
963
debug = true;
964
break;
965
case 'c': /* --connect */
966
connect_to = arg;
967
break;
968
case 'i': /* --interface */
969
interface = arg;
970
break;
971
case 's': /* --seckey */
972
seckey = arg;
973
break;
974
case 'p': /* --pubkey */
975
pubkey = arg;
976
break;
977
case 129: /* --dh-bits */
978
errno = 0;
979
tmpmax = strtoimax(arg, &tmp, 10);
980
if(errno != 0 or tmp == arg or *tmp != '\0'
981
or tmpmax != (typeof(mc.dh_bits))tmpmax){
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
984
}
985
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
break;
987
case 130: /* --priority */
988
mc.priority = arg;
989
break;
990
case 131: /* --delay */
991
errno = 0;
992
delay = strtof(arg, &tmp);
993
if(errno != 0 or tmp == arg or *tmp != '\0'){
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
996
}
997
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
1001
break;
1002
default:
1003
return ARGP_ERR_UNKNOWN;
1004
}
1005
return 0;
1006
}
1007
1008
struct argp argp = { .options = options, .parser = parse_opt,
1009
.args_doc = "",
1010
.doc = "Mandos client -- Get and decrypt"
1011
" passwords from a Mandos server" };
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
}
1019
1020
if(not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1025
from the signal handler */
1026
/* Initialize the pseudo-RNG for Avahi */
1027
srand((unsigned int) time(NULL));
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if(mc.simple_poll == NULL){
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
1032
goto end;
1033
}
1034
1035
sigemptyset(&sigterm_action.sa_mask);
1036
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
if(ret == -1){
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
}
1042
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
if(ret == -1){
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
1046
goto end;
1047
}
1048
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
if(ret == -1){
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* If the interface is down, bring it up */
1062
if(interface[0] != '\0'){
1063
#ifdef __linux__
1064
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1066
ret = klogctl(8, NULL, 5);
1067
bool restore_loglevel = true;
1068
if(ret == -1){
1069
restore_loglevel = false;
1070
perror("klogctl");
1071
}
1072
#endif /* __linux__ */
1073
1074
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1078
#ifdef __linux__
1079
if(restore_loglevel){
1080
ret = klogctl(7, NULL, 0);
1081
if(ret == -1){
1082
perror("klogctl");
1083
}
1084
}
1085
#endif /* __linux__ */
1086
goto end;
1087
}
1088
strcpy(network.ifr_name, interface);
1089
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
ret = klogctl(7, NULL, 0);
1095
if(ret == -1){
1096
perror("klogctl");
1097
}
1098
}
1099
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1101
goto end;
1102
}
1103
if((network.ifr_flags & IFF_UP) == 0){
1104
network.ifr_flags |= IFF_UP;
1105
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1109
#ifdef __linux__
1110
if(restore_loglevel){
1111
ret = klogctl(7, NULL, 0);
1112
if(ret == -1){
1113
perror("klogctl");
1114
}
1115
}
1116
#endif /* __linux__ */
1117
goto end;
1118
}
1119
}
1120
/* sleep checking until interface is running */
1121
for(int i=0; i < delay * 4; i++){
1122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
if(ret == -1){
1124
perror("ioctl SIOCGIFFLAGS");
1125
} else if(network.ifr_flags & IFF_RUNNING){
1126
break;
1127
}
1128
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
ret = nanosleep(&sleeptime, NULL);
1130
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1132
}
1133
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1137
}
1138
#ifdef __linux__
1139
if(restore_loglevel){
1140
/* Restores kernel loglevel to default */
1141
ret = klogctl(7, NULL, 0);
1142
if(ret == -1){
1143
perror("klogctl");
1144
}
1145
}
1146
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
1161
}
1162
1163
ret = init_gnutls_global(pubkey, seckey);
1164
if(ret == -1){
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
1167
goto end;
1168
} else {
1169
gnutls_initialized = true;
1170
}
1171
1172
if(mkdtemp(tempdir) == NULL){
1173
perror("mkdtemp");
1174
goto end;
1175
}
1176
tempdir_created = true;
1177
1178
if(not init_gpgme(pubkey, seckey, tempdir)){
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
1181
goto end;
1182
} else {
1183
gpgme_initialized = true;
1184
}
1185
1186
if(interface[0] != '\0'){
1187
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
if(if_index == 0){
1189
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
1193
}
1194
1195
if(connect_to != NULL){
1196
/* Connect directly, do not use Zeroconf */
1197
/* (Mainly meant for debugging) */
1198
char *address = strrchr(connect_to, ':');
1199
if(address == NULL){
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
1204
uint16_t port;
1205
errno = 0;
1206
tmpmax = strtoimax(address+1, &tmp, 10);
1207
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1208
or tmpmax != (uint16_t)tmpmax){
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
1213
port = (uint16_t)tmpmax;
1214
*address = '\0';
1215
address = connect_to;
1216
/* Colon in address indicates IPv6 */
1217
int af;
1218
if(strchr(address, ':') != NULL){
1219
af = AF_INET6;
1220
} else {
1221
af = AF_INET;
1222
}
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
1227
exitcode = EXIT_SUCCESS;
1228
}
1229
goto end;
1230
}
1231
1232
{
637
1233
AvahiServerConfig config;
638
AvahiSServiceBrowser *sb = NULL;
639
int error;
640
int ret;
641
int returncode = EXIT_SUCCESS;
642
const char *interface = "eth0";
643
644
while (true){
645
static struct option long_options[] = {
646
{"debug", no_argument, (int *)&debug, 1},
647
{"interface", required_argument, 0, 'i'},
648
{"certdir", required_argument, 0, 'd'},
649
{"certkey", required_argument, 0, 'c'},
650
{"certfile", required_argument, 0, 'k'},
651
{0, 0, 0, 0} };
652
653
int option_index = 0;
654
ret = getopt_long (argc, argv, "i:", long_options,
655
&option_index);
656
657
if (ret == -1){
658
break;
659
}
660
661
switch(ret){
662
case 0:
663
break;
664
case 'i':
665
interface = optarg;
666
break;
667
case 'd':
668
certdir = optarg;
669
break;
670
case 'c':
671
certfile = optarg;
672
break;
673
case 'k':
674
certkey = optarg;
675
break;
676
default:
677
exit(EXIT_FAILURE);
678
}
679
}
680
681
certfile = combinestrings(certdir, certfile);
682
if (certfile == NULL){
683
goto exit;
684
}
685
686
certkey = combinestrings(certdir, certkey);
687
if (certkey == NULL){
688
goto exit;
689
}
690
691
if (not debug){
692
avahi_set_log_function(empty_log);
693
}
694
695
/* Initialize the psuedo-RNG */
696
srand((unsigned int) time(NULL));
697
698
/* Allocate main loop object */
699
if (!(simple_poll = avahi_simple_poll_new())) {
700
fprintf(stderr, "Failed to create simple poll object.\n");
701
702
goto exit;
703
}
704
705
/* Do not publish any local records */
1234
/* Do not publish any local Zeroconf records */
706
1235
avahi_server_config_init(&config);
707
1236
config.publish_hinfo = 0;
708
1237
config.publish_addresses = 0;
709
1238
config.publish_workstation = 0;
710
1239
config.publish_domain = 0;
711
1240
712
1241
/* Allocate a new server */
713
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
714
&config, NULL, NULL, &error);
715
716
/* Free the configuration data */
1242
mc.server = avahi_server_new(avahi_simple_poll_get
1243
(mc.simple_poll), &config, NULL,
1244
NULL, &error);
1245
1246
/* Free the Avahi configuration data */
717
1247
avahi_server_config_free(&config);
718
719
/* Check if creating the server object succeeded */
720
if (!server) {
721
fprintf(stderr, "Failed to create server: %s\n",
722
avahi_strerror(error));
723
returncode = EXIT_FAILURE;
724
goto exit;
725
}
726
727
/* Create the service browser */
728
sb = avahi_s_service_browser_new(server,
729
(AvahiIfIndex)
730
if_nametoindex(interface),
731
AVAHI_PROTO_INET6,
732
"_mandos._tcp", NULL, 0,
733
browse_callback, server);
734
if (!sb) {
735
fprintf(stderr, "Failed to create service browser: %s\n",
736
avahi_strerror(avahi_server_errno(server)));
737
returncode = EXIT_FAILURE;
738
goto exit;
739
}
740
741
/* Run the main loop */
742
743
if (debug){
744
fprintf(stderr, "Starting avahi loop search\n");
745
}
746
747
avahi_simple_poll_loop(simple_poll);
748
749
exit:
750
751
if (debug){
752
fprintf(stderr, "%s exiting\n", argv[0]);
753
}
754
755
/* Cleanup things */
756
if (sb)
757
avahi_s_service_browser_free(sb);
758
759
if (server)
760
avahi_server_free(server);
761
762
if (simple_poll)
763
avahi_simple_poll_free(simple_poll);
764
765
return returncode;
1248
}
1249
1250
/* Check if creating the Avahi server object succeeded */
1251
if(mc.server == NULL){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
1253
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
1255
goto end;
1256
}
1257
1258
/* Create the Avahi service browser */
1259
sb = avahi_s_service_browser_new(mc.server, if_index,
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
1261
NULL, 0, browse_callback, NULL);
1262
if(sb == NULL){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
1264
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
1266
goto end;
1267
}
1268
1269
/* Run the main loop */
1270
1271
if(debug){
1272
fprintf(stderr, "Starting Avahi loop search\n");
1273
}
1274
1275
avahi_simple_poll_loop(mc.simple_poll);
1276
1277
end:
1278
1279
if(debug){
1280
fprintf(stderr, "%s exiting\n", argv[0]);
1281
}
1282
1283
/* Cleanup things */
1284
if(sb != NULL)
1285
avahi_s_service_browser_free(sb);
1286
1287
if(mc.server != NULL)
1288
avahi_server_free(mc.server);
1289
1290
if(mc.simple_poll != NULL)
1291
avahi_simple_poll_free(mc.simple_poll);
1292
1293
if(gnutls_initialized){
1294
gnutls_certificate_free_credentials(mc.cred);
1295
gnutls_global_deinit();
1296
gnutls_dh_params_deinit(mc.dh_params);
1297
}
1298
1299
if(gpgme_initialized){
1300
gpgme_release(mc.ctx);
1301
}
1302
1303
/* Removes the temp directory used by GPGME */
1304
if(tempdir_created){
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
1325
char *fullname = NULL;
1326
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
direntry->d_name);
1328
if(ret < 0){
1329
perror("asprintf");
1330
continue;
1331
}
1332
ret = remove(fullname);
1333
if(ret == -1){
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
1336
}
1337
free(fullname);
1338
}
1339
closedir(d);
1340
}
1341
ret = rmdir(tempdir);
1342
if(ret == -1 and errno != ENOENT){
1343
perror("rmdir");
1344
}
1345
}
1346
1347
return exitcode;
766
1348
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0