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- Committer: Björn Påhlsson
- Date: 2008-08-03 16:08:20 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 41.
- Revision ID: belorn@braxen-20080803160820-0tw2n3ufebh51e3i
Added support for protocol version handling
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.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
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
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_* */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
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
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
43
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
44
94
45
#include <avahi-core/core.h>
95
46
#include <avahi-core/lookup.h>
96
47
#include <avahi-core/log.h>
98
49
#include <avahi-common/malloc.h>
99
50
#include <avahi-common/error.h>
100
51
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_* */
52
//mandos client part
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
58
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
66
// gpgme
67
#include <errno.h> /* perror() */
68
#include <gpgme.h>
69
70
// getopt long
71
#include <getopt.h>
117
72
118
73
#define BUFFER_SIZE 256
74
#define DH_BITS 1024
119
75
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
76
static const char *certdir = "/conf/conf.d/mandos";
77
static const char *certfile = "openpgp-client.txt";
78
static const char *certkey = "openpgp-client-key.txt";
123
79
124
80
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>";
128
129
/* Used for passing in values through the Avahi callback functions */
81
82
const char mandos_protocol_version[] = "1";
83
130
84
typedef struct {
131
85
AvahiSimplePoll *simple_poll;
132
86
AvahiServer *server;
133
87
gnutls_certificate_credentials_t cred;
134
88
unsigned int dh_bits;
135
gnutls_dh_params_t dh_params;
136
89
const char *priority;
137
gpgme_ctx_t ctx;
138
90
} mandos_context;
139
91
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,
92
size_t adjustbuffer(char *buffer, size_t buffer_length,
151
93
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
94
if (buffer_length + BUFFER_SIZE > buffer_capacity){
95
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
96
if (buffer == NULL){
155
97
return 0;
156
98
}
157
99
buffer_capacity += BUFFER_SIZE;
159
101
return buffer_capacity;
160
102
}
161
103
162
/*
163
* Initialize GPGME.
164
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
104
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
105
char **new_packet,
106
const char *homedir){
107
gpgme_data_t dh_crypto, dh_plain;
108
gpgme_ctx_t ctx;
168
109
gpgme_error_t rc;
110
ssize_t ret;
111
size_t new_packet_capacity = 0;
112
ssize_t new_packet_length = 0;
169
113
gpgme_engine_info_t engine_info;
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");
114
115
if (debug){
116
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
209
117
}
210
118
211
119
/* Init GPGME */
212
120
gpgme_check_version(NULL);
213
121
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
122
if (rc != GPG_ERR_NO_ERROR){
215
123
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
124
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
125
return -1;
218
126
}
219
127
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){
128
/* Set GPGME home directory */
129
rc = gpgme_get_engine_info (&engine_info);
130
if (rc != GPG_ERR_NO_ERROR){
223
131
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
132
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
133
return -1;
226
134
}
227
135
while(engine_info != NULL){
228
136
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
137
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
138
engine_info->file_name, homedir);
231
139
break;
232
140
}
233
141
engine_info = engine_info->next;
234
142
}
235
143
if(engine_info == NULL){
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){
144
fprintf(stderr, "Could not set home dir to %s\n", homedir);
145
return -1;
146
}
147
148
/* Create new GPGME data buffer from packet buffer */
149
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
150
if (rc != GPG_ERR_NO_ERROR){
276
151
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
152
gpgme_strsource(rc), gpgme_strerror(rc));
278
153
return -1;
280
155
281
156
/* Create new empty GPGME data buffer for the plaintext */
282
157
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
158
if (rc != GPG_ERR_NO_ERROR){
284
159
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
160
gpgme_strsource(rc), gpgme_strerror(rc));
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){
161
return -1;
162
}
163
164
/* Create new GPGME "context" */
165
rc = gpgme_new(&ctx);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_new: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
169
return -1;
170
}
171
172
/* Decrypt data from the FILE pointer to the plaintext data
173
buffer */
174
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
175
if (rc != GPG_ERR_NO_ERROR){
294
176
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
177
gpgme_strsource(rc), gpgme_strerror(rc));
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;
178
return -1;
179
}
180
181
if(debug){
182
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
183
}
184
185
if (debug){
186
gpgme_decrypt_result_t result;
187
result = gpgme_op_decrypt_result(ctx);
188
if (result == NULL){
189
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
190
} else {
191
fprintf(stderr, "Unsupported algorithm: %s\n",
192
result->unsupported_algorithm);
193
fprintf(stderr, "Wrong key usage: %d\n",
194
result->wrong_key_usage);
195
if(result->file_name != NULL){
196
fprintf(stderr, "File name: %s\n", result->file_name);
197
}
198
gpgme_recipient_t recipient;
199
recipient = result->recipients;
200
if(recipient){
312
201
while(recipient != NULL){
313
202
fprintf(stderr, "Public key algorithm: %s\n",
314
203
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
209
}
321
210
}
322
211
}
323
goto decrypt_end;
324
212
}
325
213
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
}
214
/* Delete the GPGME FILE pointer cryptotext data buffer */
215
gpgme_data_release(dh_crypto);
329
216
330
217
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
333
plaintext_length = -1;
334
goto decrypt_end;
218
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
219
perror("pgpme_data_seek");
335
220
}
336
221
337
*plaintext = NULL;
222
*new_packet = 0;
338
223
while(true){
339
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
341
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
224
new_packet_capacity = adjustbuffer(*new_packet, new_packet_length,
225
new_packet_capacity);
226
if (new_packet_capacity == 0){
227
perror("adjustbuffer");
228
return -1;
229
}
230
new_packet_capacity += BUFFER_SIZE;
346
231
}
347
232
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
233
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
349
234
BUFFER_SIZE);
350
235
/* Print the data, if any */
351
if(ret == 0){
352
/* EOF */
236
if (ret == 0){
353
237
break;
354
238
}
355
239
if(ret < 0){
356
240
perror("gpgme_data_read");
357
plaintext_length = -1;
358
goto decrypt_end;
359
}
360
plaintext_length += ret;
361
}
362
363
if(debug){
364
fprintf(stderr, "Decrypted password is: ");
365
for(ssize_t i = 0; i < plaintext_length; i++){
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
367
}
368
fprintf(stderr, "\n");
369
}
370
371
decrypt_end:
372
373
/* Delete the GPGME cryptotext data buffer */
374
gpgme_data_release(dh_crypto);
241
return -1;
242
}
243
new_packet_length += ret;
244
}
245
246
/* FIXME: check characters before printing to screen so to not print
247
terminal control characters */
248
/* if(debug){ */
249
/* fprintf(stderr, "decrypted password is: "); */
250
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
251
/* fprintf(stderr, "\n"); */
252
/* } */
375
253
376
254
/* Delete the GPGME plaintext data buffer */
377
255
gpgme_data_release(dh_plain);
378
return plaintext_length;
256
return new_packet_length;
379
257
}
380
258
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
259
static const char * safer_gnutls_strerror (int value) {
260
const char *ret = gnutls_strerror (value);
261
if (ret == NULL)
385
262
ret = "(unknown)";
386
263
return ret;
387
264
}
388
265
389
/* GnuTLS log function callback */
390
266
static void debuggnutls(__attribute__((unused)) int level,
391
267
const char* string){
392
fprintf(stderr, "GnuTLS: %s", string);
268
fprintf(stderr, "%s", string);
393
269
}
394
270
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
271
static int initgnutls(mandos_context *mc){
272
const char *err;
397
273
int ret;
398
274
399
275
if(debug){
400
276
fprintf(stderr, "Initializing GnuTLS\n");
401
277
}
402
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
278
279
if ((ret = gnutls_global_init ())
280
!= GNUTLS_E_SUCCESS) {
281
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
407
282
return -1;
408
283
}
409
410
if(debug){
411
/* "Use a log level over 10 to enable all debugging options."
412
* - GnuTLS manual
413
*/
284
285
if (debug){
414
286
gnutls_global_set_log_level(11);
415
287
gnutls_global_set_log_function(debuggnutls);
416
288
}
417
289
418
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
290
/* openpgp credentials */
291
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
292
!= GNUTLS_E_SUCCESS) {
293
fprintf (stderr, "memory error: %s\n",
294
safer_gnutls_strerror(ret));
427
295
return -1;
428
296
}
429
297
430
298
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
299
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
300
" and keyfile %s as GnuTLS credentials\n", certfile,
301
certkey);
434
302
}
435
303
436
304
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
445
goto globalfail;
446
}
447
448
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
464
return 0;
465
466
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
return -1;
472
}
473
474
static int init_gnutls_session(gnutls_session_t *session){
475
int ret;
476
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
305
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
306
if (ret != GNUTLS_E_SUCCESS) {
307
fprintf
308
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
309
" '%s')\n",
310
ret, certfile, certkey);
311
fprintf(stdout, "The Error is: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
//GnuTLS server initialization
317
if ((ret = gnutls_dh_params_init (&es->dh_params))
318
!= GNUTLS_E_SUCCESS) {
319
fprintf (stderr, "Error in dh parameter initialization: %s\n",
320
safer_gnutls_strerror(ret));
321
return -1;
322
}
323
324
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
325
!= GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "Error in prime generation: %s\n",
327
safer_gnutls_strerror(ret));
328
return -1;
329
}
330
331
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
332
333
// GnuTLS session creation
334
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
335
!= GNUTLS_E_SUCCESS){
479
336
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
337
safer_gnutls_strerror(ret));
481
338
}
482
339
483
{
484
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
491
return -1;
492
}
340
if ((ret = gnutls_priority_set_direct (es->session, mc->priority, &err))
341
!= GNUTLS_E_SUCCESS) {
342
fprintf(stderr, "Syntax error at: %s\n", err);
343
fprintf(stderr, "GnuTLS error: %s\n",
344
safer_gnutls_strerror(ret));
345
return -1;
493
346
}
494
347
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
348
if ((ret = gnutls_credentials_set
349
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
350
!= GNUTLS_E_SUCCESS) {
351
fprintf(stderr, "Error setting a credentials set: %s\n",
499
352
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
501
353
return -1;
502
354
}
503
355
504
356
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
357
gnutls_certificate_server_set_request (es->session,
358
GNUTLS_CERT_IGNORE);
507
359
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
360
gnutls_dh_set_prime_bits (es->session, DH_BITS);
509
361
510
362
return 0;
511
363
}
512
364
513
/* Avahi log function callback */
514
365
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
366
__attribute__((unused)) const char *txt){}
516
367
517
/* Called when a Mandos server is found */
518
368
static int start_mandos_communication(const char *ip, uint16_t port,
519
369
AvahiIfIndex if_index,
520
int af){
370
mandos_context *mc){
521
371
int ret, tcp_sd;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
372
struct sockaddr_in6 to;
373
encrypted_session es;
527
374
char *buffer = NULL;
528
375
char *decrypted_buffer;
529
376
size_t buffer_length = 0;
531
378
ssize_t decrypted_buffer_size;
532
379
size_t written;
533
380
int retval = 0;
534
gnutls_session_t session;
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
551
return -1;
552
}
381
char interface[IF_NAMESIZE];
553
382
554
383
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
556
"\n", ip, port);
384
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
385
ip, port);
557
386
}
558
387
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
388
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
389
if(tcp_sd < 0) {
561
390
perror("socket");
562
391
return -1;
563
392
}
393
394
if(debug){
395
if(if_indextoname((unsigned int)if_index, interface) == NULL){
396
if(debug){
397
perror("if_indextoname");
398
}
399
return -1;
400
}
401
402
fprintf(stderr, "Binding to interface %s\n", interface);
403
}
564
404
565
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
405
memset(&to,0,sizeof(to)); /* Spurious warning */
406
to.sin6_family = AF_INET6;
407
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
408
if (ret < 0 ){
574
409
perror("inet_pton");
575
410
return -1;
576
}
411
}
577
412
if(ret == 0){
578
413
fprintf(stderr, "Bad address: %s\n", ip);
579
414
return -1;
580
415
}
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
416
to.sin6_port = htons(port); /* Spurious warning */
417
418
to.sin6_scope_id = (uint32_t)if_index;
602
419
603
420
if(debug){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
627
perror("inet_ntop");
628
} else {
629
if(strcmp(addrstr, ip) != 0){
630
fprintf(stderr, "Canonical address form: %s\n", addrstr);
631
}
632
}
421
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
422
/* char addrstr[INET6_ADDRSTRLEN]; */
423
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
424
/* sizeof(addrstr)) == NULL){ */
425
/* perror("inet_ntop"); */
426
/* } else { */
427
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
428
/* addrstr, ntohs(to.sin6_port)); */
429
/* } */
633
430
}
634
431
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
432
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
433
if (ret < 0){
641
434
perror("connect");
642
435
return -1;
643
436
}
644
645
const char *out = mandos_protocol_version;
437
438
char *out = mandos_protocol_version;
646
439
written = 0;
647
while(true){
440
while (true){
648
441
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
442
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
443
out_size - written));
651
if(ret == -1){
444
if (ret == -1){
652
445
perror("write");
653
446
retval = -1;
654
goto mandos_end;
447
goto end;
655
448
}
656
written += (size_t)ret;
449
written += ret;
657
450
if(written < out_size){
658
451
continue;
659
452
} else {
660
if(out == mandos_protocol_version){
453
if (out == mandos_protocol_version){
661
454
written = 0;
662
455
out = "\r\n";
663
456
} else {
665
458
}
666
459
}
667
460
}
461
462
ret = initgnutls (&es);
463
if (ret != 0){
464
retval = -1;
465
return -1;
466
}
467
468
gnutls_transport_set_ptr (es.session,
469
(gnutls_transport_ptr_t) tcp_sd);
668
470
669
471
if(debug){
670
472
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
473
}
672
474
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
675
do{
676
ret = gnutls_handshake(session);
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
679
if(ret != GNUTLS_E_SUCCESS){
475
ret = gnutls_handshake (es.session);
476
477
if (ret != GNUTLS_E_SUCCESS){
680
478
if(debug){
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
682
gnutls_perror(ret);
479
fprintf(stderr, "\n*** Handshake failed ***\n");
480
gnutls_perror (ret);
683
481
}
684
482
retval = -1;
685
goto mandos_end;
483
goto exit;
686
484
}
687
485
688
/* Read OpenPGP packet that contains the wanted password */
486
//Retrieve OpenPGP packet that contains the wanted password
689
487
690
488
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
489
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
490
ip);
693
491
}
694
492
695
493
while(true){
696
buffer_capacity = incbuffer(&buffer, buffer_length,
697
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
494
buffer_capacity = adjustbuffer(buffer, buffer_length, buffer_capacity);
495
if (buffer_capacity == 0){
496
perror("adjustbuffer");
700
497
retval = -1;
701
goto mandos_end;
498
goto exit;
702
499
}
703
500
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
501
ret = gnutls_record_recv
502
(es.session, buffer+buffer_length, BUFFER_SIZE);
503
if (ret == 0){
707
504
break;
708
505
}
709
if(sret < 0){
710
switch(sret){
506
if (ret < 0){
507
switch(ret){
711
508
case GNUTLS_E_INTERRUPTED:
712
509
case GNUTLS_E_AGAIN:
713
510
break;
714
511
case GNUTLS_E_REHANDSHAKE:
715
do{
716
ret = gnutls_handshake(session);
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
720
gnutls_perror(ret);
512
ret = gnutls_handshake (es.session);
513
if (ret < 0){
514
fprintf(stderr, "\n*** Handshake failed ***\n");
515
gnutls_perror (ret);
721
516
retval = -1;
722
goto mandos_end;
517
goto exit;
723
518
}
724
519
break;
725
520
default:
726
521
fprintf(stderr, "Unknown error while reading data from"
727
" encrypted session with Mandos server\n");
522
" encrypted session with mandos server\n");
728
523
retval = -1;
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
730
goto mandos_end;
524
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
525
goto exit;
731
526
}
732
527
} else {
733
buffer_length += (size_t) sret;
528
buffer_length += (size_t) ret;
734
529
}
735
530
}
736
531
737
if(debug){
738
fprintf(stderr, "Closing TLS session\n");
739
}
740
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
742
743
if(buffer_length > 0){
532
if (buffer_length > 0){
744
533
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
534
buffer_length,
746
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
535
&decrypted_buffer,
536
certdir);
537
if (decrypted_buffer_size >= 0){
748
538
written = 0;
749
539
while(written < (size_t) decrypted_buffer_size){
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
540
ret = (int)fwrite (decrypted_buffer + written, 1,
541
(size_t)decrypted_buffer_size - written,
542
stdout);
753
543
if(ret == 0 and ferror(stdout)){
754
544
if(debug){
755
545
fprintf(stderr, "Error writing encrypted data: %s\n",
764
554
} else {
765
555
retval = -1;
766
556
}
767
} else {
768
retval = -1;
769
}
770
771
/* Shutdown procedure */
772
773
mandos_end:
557
}
558
559
//shutdown procedure
560
561
if(debug){
562
fprintf(stderr, "Closing TLS session\n");
563
}
564
774
565
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
778
}
779
gnutls_deinit(session);
566
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
567
exit:
568
close(tcp_sd);
569
gnutls_deinit (es.session);
570
gnutls_certificate_free_credentials (es.cred);
571
gnutls_global_deinit ();
780
572
return retval;
781
573
}
782
574
783
static void resolve_callback(AvahiSServiceResolver *r,
784
AvahiIfIndex interface,
785
AvahiProtocol proto,
786
AvahiResolverEvent event,
787
const char *name,
788
const char *type,
789
const char *domain,
790
const char *host_name,
791
const AvahiAddress *address,
792
uint16_t port,
793
AVAHI_GCC_UNUSED AvahiStringList *txt,
794
AVAHI_GCC_UNUSED AvahiLookupResultFlags
795
flags,
796
AVAHI_GCC_UNUSED void* userdata){
797
assert(r);
575
static void resolve_callback( AvahiSServiceResolver *r,
576
AvahiIfIndex interface,
577
AVAHI_GCC_UNUSED AvahiProtocol protocol,
578
AvahiResolverEvent event,
579
const char *name,
580
const char *type,
581
const char *domain,
582
const char *host_name,
583
const AvahiAddress *address,
584
uint16_t port,
585
AVAHI_GCC_UNUSED AvahiStringList *txt,
586
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
587
AVAHI_GCC_UNUSED void* userdata) {
588
mandos_context *mc = userdata;
589
assert(r); /* Spurious warning */
798
590
799
591
/* Called whenever a service has been resolved successfully or
800
592
timed out */
801
593
802
switch(event){
594
switch (event) {
803
595
default:
804
596
case AVAHI_RESOLVER_FAILURE:
805
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
806
" of type '%s' in domain '%s': %s\n", name, type, domain,
807
avahi_strerror(avahi_server_errno(mc.server)));
597
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
598
" type '%s' in domain '%s': %s\n", name, type, domain,
599
avahi_strerror(avahi_server_errno(mc->server)));
808
600
break;
809
601
810
602
case AVAHI_RESOLVER_FOUND:
812
604
char ip[AVAHI_ADDRESS_STR_MAX];
813
605
avahi_address_snprint(ip, sizeof(ip), address);
814
606
if(debug){
815
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
816
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
817
ip, (intmax_t)interface, port);
607
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
608
" port %d\n", name, host_name, ip, port);
818
609
}
819
int ret = start_mandos_communication(ip, port, interface,
820
avahi_proto_to_af(proto));
821
if(ret == 0){
822
avahi_simple_poll_quit(mc.simple_poll);
610
int ret = start_mandos_communication(ip, port, interface, mc);
611
if (ret == 0){
612
exit(EXIT_SUCCESS);
823
613
}
824
614
}
825
615
}
826
616
avahi_s_service_resolver_free(r);
827
617
}
828
618
829
static void browse_callback(AvahiSServiceBrowser *b,
830
AvahiIfIndex interface,
831
AvahiProtocol protocol,
832
AvahiBrowserEvent event,
833
const char *name,
834
const char *type,
835
const char *domain,
836
AVAHI_GCC_UNUSED AvahiLookupResultFlags
837
flags,
838
AVAHI_GCC_UNUSED void* userdata){
839
assert(b);
619
static void browse_callback( AvahiSServiceBrowser *b,
620
AvahiIfIndex interface,
621
AvahiProtocol protocol,
622
AvahiBrowserEvent event,
623
const char *name,
624
const char *type,
625
const char *domain,
626
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
627
void* userdata) {
628
mandos_context *mc = userdata;
629
assert(b); /* Spurious warning */
840
630
841
631
/* Called whenever a new services becomes available on the LAN or
842
632
is removed from the LAN */
843
633
844
switch(event){
634
switch (event) {
845
635
default:
846
636
case AVAHI_BROWSER_FAILURE:
847
848
fprintf(stderr, "(Avahi browser) %s\n",
849
avahi_strerror(avahi_server_errno(mc.server)));
850
avahi_simple_poll_quit(mc.simple_poll);
637
638
fprintf(stderr, "(Browser) %s\n",
639
avahi_strerror(avahi_server_errno(mc->server)));
640
avahi_simple_poll_quit(mc->simple_poll);
851
641
return;
852
642
853
643
case AVAHI_BROWSER_NEW:
854
/* We ignore the returned Avahi resolver object. In the callback
855
function we free it. If the Avahi server is terminated before
856
the callback function is called the Avahi server will free the
857
resolver for us. */
858
859
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
860
name, type, domain, protocol, 0,
861
resolve_callback, NULL) == NULL)
862
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
863
name, avahi_strerror(avahi_server_errno(mc.server)));
644
/* We ignore the returned resolver object. In the callback
645
function we free it. If the server is terminated before
646
the callback function is called the server will free
647
the resolver for us. */
648
649
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
650
type, domain,
651
AVAHI_PROTO_INET6, 0,
652
resolve_callback, mc)))
653
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
654
avahi_strerror(avahi_server_errno(s)));
864
655
break;
865
656
866
657
case AVAHI_BROWSER_REMOVE:
867
658
break;
868
659
869
660
case AVAHI_BROWSER_ALL_FOR_NOW:
870
661
case AVAHI_BROWSER_CACHE_EXHAUSTED:
871
if(debug){
872
fprintf(stderr, "No Mandos server found, still searching...\n");
873
}
874
662
break;
875
663
}
876
664
}
877
665
878
sig_atomic_t quit_now = 0;
879
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
882
if(quit_now){
883
return;
884
}
885
quit_now = 1;
886
int old_errno = errno;
887
if(mc.simple_poll != NULL){
888
avahi_simple_poll_quit(mc.simple_poll);
889
}
890
errno = old_errno;
666
/* Combines file name and path and returns the malloced new
667
string. some sane checks could/should be added */
668
static const char *combinepath(const char *first, const char *second){
669
size_t f_len = strlen(first);
670
size_t s_len = strlen(second);
671
char *tmp = malloc(f_len + s_len + 2);
672
if (tmp == NULL){
673
return NULL;
674
}
675
if(f_len > 0){
676
memcpy(tmp, first, f_len);
677
}
678
tmp[f_len] = '/';
679
if(s_len > 0){
680
memcpy(tmp + f_len + 1, second, s_len);
681
}
682
tmp[f_len + 1 + s_len] = '\0';
683
return tmp;
891
684
}
892
685
893
int main(int argc, char *argv[]){
894
AvahiSServiceBrowser *sb = NULL;
895
int error;
896
int ret;
897
intmax_t tmpmax;
898
char *tmp;
899
int exitcode = EXIT_SUCCESS;
900
const char *interface = "eth0";
901
struct ifreq network;
902
int sd;
903
uid_t uid;
904
gid_t gid;
905
char *connect_to = NULL;
906
char tempdir[] = "/tmp/mandosXXXXXX";
907
bool tempdir_created = false;
908
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
909
const char *seckey = PATHDIR "/" SECKEY;
910
const char *pubkey = PATHDIR "/" PUBKEY;
911
912
bool gnutls_initialized = false;
913
bool gpgme_initialized = false;
914
float delay = 2.5f;
915
916
struct sigaction old_sigterm_action;
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
919
{
920
struct argp_option options[] = {
921
{ .name = "debug", .key = 128,
922
.doc = "Debug mode", .group = 3 },
923
{ .name = "connect", .key = 'c',
924
.arg = "ADDRESS:PORT",
925
.doc = "Connect directly to a specific Mandos server",
926
.group = 1 },
927
{ .name = "interface", .key = 'i',
928
.arg = "NAME",
929
.doc = "Network interface that will be used to search for"
930
" Mandos servers",
931
.group = 1 },
932
{ .name = "seckey", .key = 's',
933
.arg = "FILE",
934
.doc = "OpenPGP secret key file base name",
935
.group = 1 },
936
{ .name = "pubkey", .key = 'p',
937
.arg = "FILE",
938
.doc = "OpenPGP public key file base name",
939
.group = 2 },
940
{ .name = "dh-bits", .key = 129,
941
.arg = "BITS",
942
.doc = "Bit length of the prime number used in the"
943
" Diffie-Hellman key exchange",
944
.group = 2 },
945
{ .name = "priority", .key = 130,
946
.arg = "STRING",
947
.doc = "GnuTLS priority string for the TLS handshake",
948
.group = 1 },
949
{ .name = "delay", .key = 131,
950
.arg = "SECONDS",
951
.doc = "Maximum delay to wait for interface startup",
952
.group = 2 },
953
{ .name = NULL }
954
};
686
687
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
688
AvahiServerConfig config;
689
AvahiSServiceBrowser *sb = NULL;
690
int error;
691
int ret;
692
int returncode = EXIT_SUCCESS;
693
const char *interface = "eth0";
694
struct ifreq network;
695
int sd;
696
char *connect_to = NULL;
697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
698
mandos_context mc = { .simple_poll = NULL, .server = NULL,
699
.dh_bits = 2048, .priority = "SECURE256"};
955
700
956
error_t parse_opt(int key, char *arg,
957
struct argp_state *state){
958
switch(key){
959
case 128: /* --debug */
960
debug = true;
961
break;
962
case 'c': /* --connect */
963
connect_to = arg;
964
break;
965
case 'i': /* --interface */
966
interface = arg;
967
break;
968
case 's': /* --seckey */
969
seckey = arg;
970
break;
971
case 'p': /* --pubkey */
972
pubkey = arg;
973
break;
974
case 129: /* --dh-bits */
975
errno = 0;
976
tmpmax = strtoimax(arg, &tmp, 10);
977
if(errno != 0 or tmp == arg or *tmp != '\0'
978
or tmpmax != (typeof(mc.dh_bits))tmpmax){
979
fprintf(stderr, "Bad number of DH bits\n");
980
exit(EXIT_FAILURE);
981
}
982
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
983
break;
984
case 130: /* --priority */
985
mc.priority = arg;
986
break;
987
case 131: /* --delay */
988
errno = 0;
989
delay = strtof(arg, &tmp);
990
if(errno != 0 or tmp == arg or *tmp != '\0'){
991
fprintf(stderr, "Bad delay\n");
992
exit(EXIT_FAILURE);
993
}
994
break;
995
case ARGP_KEY_ARG:
996
argp_usage(state);
997
case ARGP_KEY_END:
701
while (true){
702
static struct option long_options[] = {
703
{"debug", no_argument, (int *)&debug, 1},
704
{"connect", required_argument, 0, 'C'},
705
{"interface", required_argument, 0, 'i'},
706
{"certdir", required_argument, 0, 'd'},
707
{"certkey", required_argument, 0, 'c'},
708
{"certfile", required_argument, 0, 'k'},
709
{"dh_bits", required_argument, 0, 'D'},
710
{"priority", required_argument, 0, 'p'},
711
{0, 0, 0, 0} };
712
713
int option_index = 0;
714
ret = getopt_long (argc, argv, "i:", long_options,
715
&option_index);
716
717
if (ret == -1){
718
break;
719
}
720
721
switch(ret){
722
case 0:
723
break;
724
case 'i':
725
interface = optarg;
726
break;
727
case 'C':
728
connect_to = optarg;
729
break;
730
case 'd':
731
certdir = optarg;
732
break;
733
case 'c':
734
certfile = optarg;
735
break;
736
case 'k':
737
certkey = optarg;
738
break;
739
case 'D':
740
{
741
long int tmp;
742
errno = 0;
743
tmp = strtol(optarg, NULL, 10);
744
if (errno == ERANGE){
745
perror("strtol");
746
exit(EXIT_FAILURE);
747
}
748
mc.dh_bits = tmp;
749
}
750
break;
751
case 'p':
752
mc.priority = optarg;
998
753
break;
999
754
default:
1000
return ARGP_ERR_UNKNOWN;
1001
}
1002
return 0;
1003
}
1004
1005
struct argp argp = { .options = options, .parser = parse_opt,
1006
.args_doc = "",
1007
.doc = "Mandos client -- Get and decrypt"
1008
" passwords from a Mandos server" };
1009
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1010
if(ret == ARGP_ERR_UNKNOWN){
1011
fprintf(stderr, "Unknown error while parsing arguments\n");
1012
exitcode = EXIT_FAILURE;
1013
goto end;
1014
}
1015
}
1016
1017
if(not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1022
from the signal handler */
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if(mc.simple_poll == NULL){
1027
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1028
exitcode = EXIT_FAILURE;
1029
goto end;
1030
}
1031
1032
sigemptyset(&sigterm_action.sa_mask);
1033
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1034
if(ret == -1){
1035
perror("sigaddset");
1036
exitcode = EXIT_FAILURE;
1037
goto end;
1038
}
1039
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1040
if(ret == -1){
1041
perror("sigaddset");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1046
if(ret == -1){
1047
perror("sigaddset");
1048
exitcode = EXIT_FAILURE;
1049
goto end;
1050
}
1051
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1052
if(ret == -1){
1053
perror("sigaction");
1054
exitcode = EXIT_FAILURE;
1055
goto end;
1056
}
1057
1058
/* If the interface is down, bring it up */
1059
if(interface[0] != '\0'){
1060
#ifdef __linux__
1061
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1062
messages to mess up the prompt */
1063
ret = klogctl(8, NULL, 5);
1064
bool restore_loglevel = true;
1065
if(ret == -1){
1066
restore_loglevel = false;
1067
perror("klogctl");
1068
}
1069
#endif /* __linux__ */
755
exit(EXIT_FAILURE);
756
}
757
}
758
759
certfile = combinepath(certdir, certfile);
760
if (certfile == NULL){
761
perror("combinepath");
762
returncode = EXIT_FAILURE;
763
goto exit;
764
}
765
766
certkey = combinepath(certdir, certkey);
767
if (certkey == NULL){
768
perror("combinepath");
769
returncode = EXIT_FAILURE;
770
goto exit;
771
}
772
773
if_index = (AvahiIfIndex) if_nametoindex(interface);
774
if(if_index == 0){
775
fprintf(stderr, "No such interface: \"%s\"\n", interface);
776
exit(EXIT_FAILURE);
777
}
778
779
if(connect_to != NULL){
780
/* Connect directly, do not use Zeroconf */
781
/* (Mainly meant for debugging) */
782
char *address = strrchr(connect_to, ':');
783
if(address == NULL){
784
fprintf(stderr, "No colon in address\n");
785
exit(EXIT_FAILURE);
786
}
787
errno = 0;
788
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
789
if(errno){
790
perror("Bad port number");
791
exit(EXIT_FAILURE);
792
}
793
*address = '\0';
794
address = connect_to;
795
ret = start_mandos_communication(address, port, if_index);
796
if(ret < 0){
797
exit(EXIT_FAILURE);
798
} else {
799
exit(EXIT_SUCCESS);
800
}
801
}
1070
802
1071
803
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1072
if(sd < 0){
804
if(sd < 0) {
1073
805
perror("socket");
1074
exitcode = EXIT_FAILURE;
1075
#ifdef __linux__
1076
if(restore_loglevel){
1077
ret = klogctl(7, NULL, 0);
1078
if(ret == -1){
1079
perror("klogctl");
1080
}
1081
}
1082
#endif /* __linux__ */
1083
goto end;
806
returncode = EXIT_FAILURE;
807
goto exit;
1084
808
}
1085
strcpy(network.ifr_name, interface);
809
strcpy(network.ifr_name, interface);
1086
810
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1087
811
if(ret == -1){
812
1088
813
perror("ioctl SIOCGIFFLAGS");
1089
#ifdef __linux__
1090
if(restore_loglevel){
1091
ret = klogctl(7, NULL, 0);
1092
if(ret == -1){
1093
perror("klogctl");
1094
}
1095
}
1096
#endif /* __linux__ */
1097
exitcode = EXIT_FAILURE;
1098
goto end;
814
returncode = EXIT_FAILURE;
815
goto exit;
1099
816
}
1100
817
if((network.ifr_flags & IFF_UP) == 0){
1101
818
network.ifr_flags |= IFF_UP;
1102
819
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1103
820
if(ret == -1){
1104
821
perror("ioctl SIOCSIFFLAGS");
1105
exitcode = EXIT_FAILURE;
1106
#ifdef __linux__
1107
if(restore_loglevel){
1108
ret = klogctl(7, NULL, 0);
1109
if(ret == -1){
1110
perror("klogctl");
1111
}
1112
}
1113
#endif /* __linux__ */
1114
goto end;
1115
}
1116
}
1117
/* sleep checking until interface is running */
1118
for(int i=0; i < delay * 4; i++){
1119
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1120
if(ret == -1){
1121
perror("ioctl SIOCGIFFLAGS");
1122
} else if(network.ifr_flags & IFF_RUNNING){
1123
break;
1124
}
1125
struct timespec sleeptime = { .tv_nsec = 250000000 };
1126
ret = nanosleep(&sleeptime, NULL);
1127
if(ret == -1 and errno != EINTR){
1128
perror("nanosleep");
1129
}
1130
}
1131
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1132
if(ret == -1){
1133
perror("close");
1134
}
1135
#ifdef __linux__
1136
if(restore_loglevel){
1137
/* Restores kernel loglevel to default */
1138
ret = klogctl(7, NULL, 0);
1139
if(ret == -1){
1140
perror("klogctl");
1141
}
1142
}
1143
#endif /* __linux__ */
1144
}
1145
1146
uid = getuid();
1147
gid = getgid();
1148
1149
errno = 0;
1150
setgid(gid);
1151
if(ret == -1){
1152
perror("setgid");
1153
}
1154
1155
ret = setuid(uid);
1156
if(ret == -1){
1157
perror("setuid");
1158
}
1159
1160
ret = init_gnutls_global(pubkey, seckey);
1161
if(ret == -1){
1162
fprintf(stderr, "init_gnutls_global failed\n");
1163
exitcode = EXIT_FAILURE;
1164
goto end;
1165
} else {
1166
gnutls_initialized = true;
1167
}
1168
1169
if(mkdtemp(tempdir) == NULL){
1170
perror("mkdtemp");
1171
goto end;
1172
}
1173
tempdir_created = true;
1174
1175
if(not init_gpgme(pubkey, seckey, tempdir)){
1176
fprintf(stderr, "init_gpgme failed\n");
1177
exitcode = EXIT_FAILURE;
1178
goto end;
1179
} else {
1180
gpgme_initialized = true;
1181
}
1182
1183
if(interface[0] != '\0'){
1184
if_index = (AvahiIfIndex) if_nametoindex(interface);
1185
if(if_index == 0){
1186
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1187
exitcode = EXIT_FAILURE;
1188
goto end;
1189
}
1190
}
1191
1192
if(connect_to != NULL){
1193
/* Connect directly, do not use Zeroconf */
1194
/* (Mainly meant for debugging) */
1195
char *address = strrchr(connect_to, ':');
1196
if(address == NULL){
1197
fprintf(stderr, "No colon in address\n");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
uint16_t port;
1202
errno = 0;
1203
tmpmax = strtoimax(address+1, &tmp, 10);
1204
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1205
or tmpmax != (uint16_t)tmpmax){
1206
fprintf(stderr, "Bad port number\n");
1207
exitcode = EXIT_FAILURE;
1208
goto end;
1209
}
1210
port = (uint16_t)tmpmax;
1211
*address = '\0';
1212
address = connect_to;
1213
/* Colon in address indicates IPv6 */
1214
int af;
1215
if(strchr(address, ':') != NULL){
1216
af = AF_INET6;
1217
} else {
1218
af = AF_INET;
1219
}
1220
ret = start_mandos_communication(address, port, if_index, af);
1221
if(ret < 0){
1222
exitcode = EXIT_FAILURE;
1223
} else {
1224
exitcode = EXIT_SUCCESS;
1225
}
1226
goto end;
1227
}
1228
1229
{
1230
AvahiServerConfig config;
1231
/* Do not publish any local Zeroconf records */
822
returncode = EXIT_FAILURE;
823
goto exit;
824
}
825
}
826
close(sd);
827
828
if (not debug){
829
avahi_set_log_function(empty_log);
830
}
831
832
/* Initialize the psuedo-RNG */
833
srand((unsigned int) time(NULL));
834
835
/* Allocate main loop object */
836
if (!(mc.simple_poll = avahi_simple_poll_new())) {
837
fprintf(stderr, "Failed to create simple poll object.\n");
838
returncode = EXIT_FAILURE;
839
goto exit;
840
}
841
842
/* Do not publish any local records */
1232
843
avahi_server_config_init(&config);
1233
844
config.publish_hinfo = 0;
1234
845
config.publish_addresses = 0;
1235
846
config.publish_workstation = 0;
1236
847
config.publish_domain = 0;
1237
848
1238
849
/* Allocate a new server */
1239
mc.server = avahi_server_new(avahi_simple_poll_get
1240
(mc.simple_poll), &config, NULL,
1241
NULL, &error);
1242
1243
/* Free the Avahi configuration data */
850
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
851
&config, NULL, NULL, &error);
852
853
/* Free the configuration data */
1244
854
avahi_server_config_free(&config);
1245
}
1246
1247
/* Check if creating the Avahi server object succeeded */
1248
if(mc.server == NULL){
1249
fprintf(stderr, "Failed to create Avahi server: %s\n",
1250
avahi_strerror(error));
1251
exitcode = EXIT_FAILURE;
1252
goto end;
1253
}
1254
1255
/* Create the Avahi service browser */
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
1257
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1258
NULL, 0, browse_callback, NULL);
1259
if(sb == NULL){
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1261
avahi_strerror(avahi_server_errno(mc.server)));
1262
exitcode = EXIT_FAILURE;
1263
goto end;
1264
}
1265
1266
/* Run the main loop */
1267
1268
if(debug){
1269
fprintf(stderr, "Starting Avahi loop search\n");
1270
}
1271
1272
avahi_simple_poll_loop(mc.simple_poll);
1273
1274
end:
1275
1276
if(debug){
1277
fprintf(stderr, "%s exiting\n", argv[0]);
1278
}
1279
1280
/* Cleanup things */
1281
if(sb != NULL)
1282
avahi_s_service_browser_free(sb);
1283
1284
if(mc.server != NULL)
1285
avahi_server_free(mc.server);
1286
1287
if(mc.simple_poll != NULL)
1288
avahi_simple_poll_free(mc.simple_poll);
1289
1290
if(gnutls_initialized){
1291
gnutls_certificate_free_credentials(mc.cred);
1292
gnutls_global_deinit();
1293
gnutls_dh_params_deinit(mc.dh_params);
1294
}
1295
1296
if(gpgme_initialized){
1297
gpgme_release(mc.ctx);
1298
}
1299
1300
/* Removes the temp directory used by GPGME */
1301
if(tempdir_created){
1302
DIR *d;
1303
struct dirent *direntry;
1304
d = opendir(tempdir);
1305
if(d == NULL){
1306
if(errno != ENOENT){
1307
perror("opendir");
1308
}
1309
} else {
1310
while(true){
1311
direntry = readdir(d);
1312
if(direntry == NULL){
1313
break;
1314
}
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
continue;
1321
}
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", tempdir,
1324
direntry->d_name);
1325
if(ret < 0){
1326
perror("asprintf");
1327
continue;
1328
}
1329
ret = remove(fullname);
1330
if(ret == -1){
1331
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1332
strerror(errno));
1333
}
1334
free(fullname);
1335
}
1336
closedir(d);
1337
}
1338
ret = rmdir(tempdir);
1339
if(ret == -1 and errno != ENOENT){
1340
perror("rmdir");
1341
}
1342
}
1343
1344
return exitcode;
855
856
/* Check if creating the server object succeeded */
857
if (!mc.server) {
858
fprintf(stderr, "Failed to create server: %s\n",
859
avahi_strerror(error));
860
returncode = EXIT_FAILURE;
861
goto exit;
862
}
863
864
/* Create the service browser */
865
sb = avahi_s_service_browser_new(mc.server, if_index,
866
AVAHI_PROTO_INET6,
867
"_mandos._tcp", NULL, 0,
868
browse_callback, &mc);
869
if (!sb) {
870
fprintf(stderr, "Failed to create service browser: %s\n",
871
avahi_strerror(avahi_server_errno(mc.server)));
872
returncode = EXIT_FAILURE;
873
goto exit;
874
}
875
876
/* Run the main loop */
877
878
if (debug){
879
fprintf(stderr, "Starting avahi loop search\n");
880
}
881
882
avahi_simple_poll_loop(simple_poll);
883
884
exit:
885
886
if (debug){
887
fprintf(stderr, "%s exiting\n", argv[0]);
888
}
889
890
/* Cleanup things */
891
if (sb)
892
avahi_s_service_browser_free(sb);
893
894
if (mc.server)
895
avahi_server_free(mc.server);
896
897
if (simple_poll)
898
avahi_simple_poll_free(simple_poll);
899
free(certfile);
900
free(certkey);
901
902
return returncode;
1345
903
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0