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237.2.105
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-04-17 08:26:17 UTC
- mto: (24.1.138 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090417082617-eltetak5lzjyz55o
* initramfs-tools-hook: Bug fix: Add "--userid" and "--groupid" to
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
- 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() */
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
35
37
#define _FILE_OFFSET_BITS 64
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
90
/* Avahi */
91
/* All Avahi types, constants and functions
92
Avahi*, avahi_*,
93
AVAHI_* */
43
94
#include <avahi-core/core.h>
44
95
#include <avahi-core/lookup.h>
45
96
#include <avahi-core/log.h>
47
98
#include <avahi-common/malloc.h>
48
99
#include <avahi-common/error.h>
49
100
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>
101
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
104
gnutls_*
105
init_gnutls_session(),
106
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
110
111
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
114
gpgme_*
115
GPGME_PROTOCOL_OpenPGP,
116
GPG_ERR_NO_* */
70
117
71
118
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
119
74
const char *certdir = "/conf/conf.d/cryptkeyreq/";
75
const char *certfile = "openpgp-client.txt";
76
const char *certkey = "openpgp-client-key.txt";
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
77
123
78
124
bool debug = false;
125
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
128
129
/* Used for passing in values through the Avahi callback functions */
80
130
typedef struct {
81
gnutls_session_t session;
131
AvahiSimplePoll *simple_poll;
132
AvahiServer *server;
82
133
gnutls_certificate_credentials_t cred;
134
unsigned int dh_bits;
83
135
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;
136
const char *priority;
90
137
gpgme_ctx_t ctx;
138
} mandos_context;
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
148
* "buffer_length" is how much is already used.
149
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
155
return 0;
156
}
157
buffer_capacity += BUFFER_SIZE;
158
}
159
return buffer_capacity;
160
}
161
162
/*
163
* Initialize GPGME.
164
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
91
168
gpgme_error_t rc;
92
ssize_t ret;
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
95
169
gpgme_engine_info_t engine_info;
96
97
if (debug){
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
170
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
99
209
}
100
210
101
211
/* Init GPGME */
102
212
gpgme_check_version(NULL);
103
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
104
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
105
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
106
216
gpgme_strsource(rc), gpgme_strerror(rc));
107
return -1;
217
return false;
108
218
}
109
219
110
/* Set GPGME home directory */
111
rc = gpgme_get_engine_info (&engine_info);
112
if (rc != GPG_ERR_NO_ERROR){
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
113
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
114
224
gpgme_strsource(rc), gpgme_strerror(rc));
115
return -1;
225
return false;
116
226
}
117
227
while(engine_info != NULL){
118
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
119
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
120
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
121
231
break;
122
232
}
123
233
engine_info = engine_info->next;
124
234
}
125
235
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){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
270
}
271
272
/* Create new GPGME data buffer from memory cryptotext */
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
0);
275
if(rc != GPG_ERR_NO_ERROR){
133
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
134
277
gpgme_strsource(rc), gpgme_strerror(rc));
135
278
return -1;
137
280
138
281
/* Create new empty GPGME data buffer for the plaintext */
139
282
rc = gpgme_data_new(&dh_plain);
140
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
141
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
142
285
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){
286
gpgme_data_release(dh_crypto);
287
return -1;
288
}
289
290
/* Decrypt data from the cryptotext data buffer to the plaintext
291
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
158
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
159
295
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
296
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
322
}
323
}
324
}
325
goto decrypt_end;
161
326
}
162
327
163
328
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);
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
330
}
198
331
199
332
/* 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;
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
335
plaintext_length = -1;
336
goto decrypt_end;
337
}
338
339
*plaintext = NULL;
203
340
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;
341
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
344
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
213
348
}
214
349
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
351
BUFFER_SIZE);
217
352
/* Print the data, if any */
218
if (ret == 0){
353
if(ret == 0){
354
/* EOF */
219
355
break;
220
356
}
221
357
if(ret < 0){
222
358
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
/* } */
359
plaintext_length = -1;
360
goto decrypt_end;
361
}
362
plaintext_length += ret;
363
}
364
365
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
367
for(ssize_t i = 0; i < plaintext_length; i++){
368
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
}
370
fprintf(stderr, "\n");
371
}
372
373
decrypt_end:
374
375
/* Delete the GPGME cryptotext data buffer */
376
gpgme_data_release(dh_crypto);
235
377
236
378
/* Delete the GPGME plaintext data buffer */
237
379
gpgme_data_release(dh_plain);
238
return new_packet_length;
380
return plaintext_length;
239
381
}
240
382
241
static const char * safer_gnutls_strerror (int value) {
242
const char *ret = gnutls_strerror (value);
243
if (ret == NULL)
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
244
387
ret = "(unknown)";
245
388
return ret;
246
389
}
247
390
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
391
/* GnuTLS log function callback */
392
static void debuggnutls(__attribute__((unused)) int level,
393
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
251
395
}
252
396
253
int initgnutls(encrypted_session *es){
254
const char *err;
397
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
255
399
int ret;
256
400
257
401
if(debug){
258
402
fprintf(stderr, "Initializing GnuTLS\n");
259
403
}
260
261
if ((ret = gnutls_global_init ())
262
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
264
409
return -1;
265
410
}
266
267
if (debug){
411
412
if(debug){
413
/* "Use a log level over 10 to enable all debugging options."
414
* - GnuTLS manual
415
*/
268
416
gnutls_global_set_log_level(11);
269
417
gnutls_global_set_log_function(debuggnutls);
270
418
}
271
419
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));
420
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
422
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
277
429
return -1;
278
430
}
279
431
280
432
if(debug){
281
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
284
436
}
285
437
286
438
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){
439
(mc.cred, pubkeyfilename, seckeyfilename,
440
GNUTLS_OPENPGP_FMT_BASE64);
441
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
447
goto globalfail;
448
}
449
450
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
465
466
return 0;
467
468
globalfail:
469
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
473
return -1;
474
}
475
476
static int init_gnutls_session(gnutls_session_t *session){
477
int ret;
478
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
480
if(ret != GNUTLS_E_SUCCESS){
318
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
482
safer_gnutls_strerror(ret));
320
483
}
321
484
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;
485
{
486
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
488
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
493
return -1;
494
}
328
495
}
329
496
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",
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
499
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
501
safer_gnutls_strerror(ret));
502
gnutls_deinit(*session);
335
503
return -1;
336
504
}
337
505
338
506
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
340
GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
341
509
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
343
511
344
512
return 0;
345
513
}
346
514
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
515
/* Avahi log function callback */
516
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
517
__attribute__((unused)) const char *txt){}
349
518
350
int start_mandos_communication(const char *ip, uint16_t port,
351
unsigned int if_index){
519
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
521
AvahiIfIndex if_index,
522
int af){
352
523
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
524
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
355
529
char *buffer = NULL;
356
530
char *decrypted_buffer;
357
531
size_t buffer_length = 0;
358
532
size_t buffer_capacity = 0;
359
533
ssize_t decrypted_buffer_size;
360
size_t written = 0;
534
size_t written;
361
535
int retval = 0;
362
char interface[IF_NAMESIZE];
536
gnutls_session_t session;
537
int pf; /* Protocol family */
538
539
switch(af){
540
case AF_INET6:
541
pf = PF_INET6;
542
break;
543
case AF_INET:
544
pf = PF_INET;
545
break;
546
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
548
return -1;
549
}
550
551
ret = init_gnutls_session(&session);
552
if(ret != 0){
553
return -1;
554
}
363
555
364
556
if(debug){
365
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
366
559
}
367
560
368
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
369
if(tcp_sd < 0) {
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
if(tcp_sd < 0){
370
563
perror("socket");
371
564
return -1;
372
565
}
373
566
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 ){
567
memset(&to, 0, sizeof(to));
568
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
574
}
575
if(ret < 0 ){
389
576
perror("inet_pton");
390
577
return -1;
391
}
578
}
392
579
if(ret == 0){
393
580
fprintf(stderr, "Bad address: %s\n", ip);
394
581
return -1;
395
582
}
396
to.sin6_port = htons(port); /* Spurious warning */
397
398
to.sin6_scope_id = (uint32_t)if_index;
583
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
591
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
595
}
596
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
598
}
599
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
}
399
604
400
605
if(debug){
401
fprintf(stderr, "Connection to: %s\n", ip);
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
char interface[IF_NAMESIZE];
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
610
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
613
}
614
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
617
}
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
402
635
}
403
636
404
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
405
if (ret < 0){
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
406
643
perror("connect");
407
644
return -1;
408
645
}
409
646
410
ret = initgnutls (&es);
411
if (ret != 0){
412
retval = -1;
413
return -1;
647
const char *out = mandos_protocol_version;
648
written = 0;
649
while(true){
650
size_t out_size = strlen(out);
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
653
if(ret == -1){
654
perror("write");
655
retval = -1;
656
goto mandos_end;
657
}
658
written += (size_t)ret;
659
if(written < out_size){
660
continue;
661
} else {
662
if(out == mandos_protocol_version){
663
written = 0;
664
out = "\r\n";
665
} else {
666
break;
667
}
668
}
414
669
}
415
670
416
gnutls_transport_set_ptr (es.session,
417
(gnutls_transport_ptr_t) tcp_sd);
418
419
671
if(debug){
420
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
421
673
}
422
674
423
ret = gnutls_handshake (es.session);
424
425
if (ret != GNUTLS_E_SUCCESS){
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
678
ret = gnutls_handshake(session);
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
681
if(ret != GNUTLS_E_SUCCESS){
426
682
if(debug){
427
fprintf(stderr, "\n*** Handshake failed ***\n");
428
gnutls_perror (ret);
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
684
gnutls_perror(ret);
429
685
}
430
686
retval = -1;
431
goto exit;
687
goto mandos_end;
432
688
}
433
689
434
//Retrieve OpenPGP packet that contains the wanted password
690
/* Read OpenPGP packet that contains the wanted password */
435
691
436
692
if(debug){
437
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
438
694
ip);
439
695
}
440
696
441
697
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;
698
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
700
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
703
goto mandos_end;
449
704
}
450
705
451
ret = gnutls_record_recv
452
(es.session, buffer+buffer_length, BUFFER_SIZE);
453
if (ret == 0){
706
sret = gnutls_record_recv(session, buffer+buffer_length,
707
BUFFER_SIZE);
708
if(sret == 0){
454
709
break;
455
710
}
456
if (ret < 0){
457
switch(ret){
711
if(sret < 0){
712
switch(sret){
458
713
case GNUTLS_E_INTERRUPTED:
459
714
case GNUTLS_E_AGAIN:
460
715
break;
461
716
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);
717
do{
718
ret = gnutls_handshake(session);
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
722
gnutls_perror(ret);
466
723
retval = -1;
467
goto exit;
724
goto mandos_end;
468
725
}
469
726
break;
470
727
default:
471
728
fprintf(stderr, "Unknown error while reading data from"
472
" encrypted session with mandos server\n");
729
" encrypted session with Mandos server\n");
473
730
retval = -1;
474
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
475
goto exit;
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
732
goto mandos_end;
476
733
}
477
734
} else {
478
buffer_length += (size_t) ret;
735
buffer_length += (size_t) sret;
479
736
}
480
737
}
481
738
482
if (buffer_length > 0){
739
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
744
745
if(buffer_length > 0){
483
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
484
747
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);
748
&decrypted_buffer);
749
if(decrypted_buffer_size >= 0){
750
written = 0;
751
while(written < (size_t) decrypted_buffer_size){
752
ret = (int)fwrite(decrypted_buffer + written, 1,
753
(size_t)decrypted_buffer_size - written,
754
stdout);
492
755
if(ret == 0 and ferror(stdout)){
493
756
if(debug){
494
757
fprintf(stderr, "Error writing encrypted data: %s\n",
503
766
} else {
504
767
retval = -1;
505
768
}
506
}
507
508
//shutdown procedure
509
510
if(debug){
511
fprintf(stderr, "Closing TLS session\n");
512
}
513
769
} else {
770
retval = -1;
771
}
772
773
/* Shutdown procedure */
774
775
mandos_end:
514
776
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 ();
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
780
}
781
gnutls_deinit(session);
521
782
return retval;
522
783
}
523
784
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 */
785
static void resolve_callback(AvahiSServiceResolver *r,
786
AvahiIfIndex interface,
787
AvahiProtocol proto,
788
AvahiResolverEvent event,
789
const char *name,
790
const char *type,
791
const char *domain,
792
const char *host_name,
793
const AvahiAddress *address,
794
uint16_t port,
795
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
543
800
544
801
/* Called whenever a service has been resolved successfully or
545
802
timed out */
546
803
547
switch (event) {
804
switch(event){
548
805
default:
549
806
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)));
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
553
810
break;
554
811
555
812
case AVAHI_RESOLVER_FOUND:
557
814
char ip[AVAHI_ADDRESS_STR_MAX];
558
815
avahi_address_snprint(ip, sizeof(ip), address);
559
816
if(debug){
560
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
561
" port %d\n", name, host_name, ip, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
562
820
}
563
int ret = start_mandos_communication(ip, port,
564
(unsigned int) interface);
565
if (ret == 0){
566
exit(EXIT_SUCCESS);
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
823
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
567
825
}
568
826
}
569
827
}
570
828
avahi_s_service_resolver_free(r);
571
829
}
572
830
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;
831
static void browse_callback(AvahiSServiceBrowser *b,
832
AvahiIfIndex interface,
833
AvahiProtocol protocol,
834
AvahiBrowserEvent event,
835
const char *name,
836
const char *type,
837
const char *domain,
838
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
842
843
/* Called whenever a new services becomes available on the LAN or
844
is removed from the LAN */
845
846
switch(event){
847
default:
848
case AVAHI_BROWSER_FAILURE:
849
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
853
return;
854
855
case AVAHI_BROWSER_NEW:
856
/* We ignore the returned Avahi resolver object. In the callback
857
function we free it. If the Avahi server is terminated before
858
the callback function is called the Avahi server will free the
859
resolver for us. */
860
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
866
break;
867
868
case AVAHI_BROWSER_REMOVE:
869
break;
870
871
case AVAHI_BROWSER_ALL_FOR_NOW:
872
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
619
875
}
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){
876
break;
877
}
878
}
879
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
884
if(quit_now){
885
return;
886
}
887
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
893
}
894
895
int main(int argc, char *argv[]){
896
AvahiSServiceBrowser *sb = NULL;
897
int error;
898
int ret;
899
intmax_t tmpmax;
624
900
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[]) {
901
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
const char *seckey = PATHDIR "/" SECKEY;
912
const char *pubkey = PATHDIR "/" PUBKEY;
913
914
bool gnutls_initialized = false;
915
bool gpgme_initialized = false;
916
float delay = 2.5f;
917
918
struct sigaction old_sigterm_action;
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
921
{
922
struct argp_option options[] = {
923
{ .name = "debug", .key = 128,
924
.doc = "Debug mode", .group = 3 },
925
{ .name = "connect", .key = 'c',
926
.arg = "ADDRESS:PORT",
927
.doc = "Connect directly to a specific Mandos server",
928
.group = 1 },
929
{ .name = "interface", .key = 'i',
930
.arg = "NAME",
931
.doc = "Network interface that will be used to search for"
932
" Mandos servers",
933
.group = 1 },
934
{ .name = "seckey", .key = 's',
935
.arg = "FILE",
936
.doc = "OpenPGP secret key file base name",
937
.group = 1 },
938
{ .name = "pubkey", .key = 'p',
939
.arg = "FILE",
940
.doc = "OpenPGP public key file base name",
941
.group = 2 },
942
{ .name = "dh-bits", .key = 129,
943
.arg = "BITS",
944
.doc = "Bit length of the prime number used in the"
945
" Diffie-Hellman key exchange",
946
.group = 2 },
947
{ .name = "priority", .key = 130,
948
.arg = "STRING",
949
.doc = "GnuTLS priority string for the TLS handshake",
950
.group = 1 },
951
{ .name = "delay", .key = 131,
952
.arg = "SECONDS",
953
.doc = "Maximum delay to wait for interface startup",
954
.group = 2 },
955
{ .name = NULL }
956
};
957
958
error_t parse_opt(int key, char *arg,
959
struct argp_state *state){
960
switch(key){
961
case 128: /* --debug */
962
debug = true;
963
break;
964
case 'c': /* --connect */
965
connect_to = arg;
966
break;
967
case 'i': /* --interface */
968
interface = arg;
969
break;
970
case 's': /* --seckey */
971
seckey = arg;
972
break;
973
case 'p': /* --pubkey */
974
pubkey = arg;
975
break;
976
case 129: /* --dh-bits */
977
errno = 0;
978
tmpmax = strtoimax(arg, &tmp, 10);
979
if(errno != 0 or tmp == arg or *tmp != '\0'
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
983
}
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
break;
986
case 130: /* --priority */
987
mc.priority = arg;
988
break;
989
case 131: /* --delay */
990
errno = 0;
991
delay = strtof(arg, &tmp);
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1000
break;
1001
default:
1002
return ARGP_ERR_UNKNOWN;
1003
}
1004
return 0;
1005
}
1006
1007
struct argp argp = { .options = options, .parser = parse_opt,
1008
.args_doc = "",
1009
.doc = "Mandos client -- Get and decrypt"
1010
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1017
}
1018
1019
if(not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
from the signal handler */
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
sigemptyset(&sigterm_action.sa_mask);
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1039
goto end;
1040
}
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1045
goto end;
1046
}
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
1113
}
1114
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1166
goto end;
1167
} else {
1168
gnutls_initialized = true;
1169
}
1170
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1180
goto end;
1181
} else {
1182
gpgme_initialized = true;
1183
}
1184
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1192
}
1193
1194
if(connect_to != NULL){
1195
/* Connect directly, do not use Zeroconf */
1196
/* (Mainly meant for debugging) */
1197
char *address = strrchr(connect_to, ':');
1198
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
1204
errno = 0;
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
1213
*address = '\0';
1214
address = connect_to;
1215
/* Colon in address indicates IPv6 */
1216
int af;
1217
if(strchr(address, ':') != NULL){
1218
af = AF_INET6;
1219
} else {
1220
af = AF_INET;
1221
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
1226
exitcode = EXIT_SUCCESS;
1227
}
1228
goto end;
1229
}
1230
1231
{
637
1232
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 */
1233
/* Do not publish any local Zeroconf records */
706
1234
avahi_server_config_init(&config);
707
1235
config.publish_hinfo = 0;
708
1236
config.publish_addresses = 0;
709
1237
config.publish_workstation = 0;
710
1238
config.publish_domain = 0;
711
1239
712
1240
/* 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 */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
1244
1245
/* Free the Avahi configuration data */
717
1246
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;
1247
}
1248
1249
/* Check if creating the Avahi server object succeeded */
1250
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
1257
/* Create the Avahi service browser */
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
1261
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
1265
goto end;
1266
}
1267
1268
/* Run the main loop */
1269
1270
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
1275
1276
end:
1277
1278
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
1280
}
1281
1282
/* Cleanup things */
1283
if(sb != NULL)
1284
avahi_s_service_browser_free(sb);
1285
1286
if(mc.server != NULL)
1287
avahi_server_free(mc.server);
1288
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
1291
1292
if(gnutls_initialized){
1293
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
gnutls_dh_params_deinit(mc.dh_params);
1296
}
1297
1298
if(gpgme_initialized){
1299
gpgme_release(mc.ctx);
1300
}
1301
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
1344
}
1345
1346
return exitcode;
766
1347
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0