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- Committer: Teddy Hogeborn
- Date: 2009-02-09 19:26:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209192619-7rse82x9pypq4ihk
* plugin-runner.c: Comment change.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
* plugins.d/mandos-client.c: Comment changes.
(quit_now): New global flag.
(handle_sigterm): Only call avahi_simple_poll_quit once.
(main): Also handle SIGINT and SIGHUP.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- 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
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
42
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, false, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
SIOCSIFFLAGS, if_indextoname(),
65
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
81
82
#ifdef __linux__
83
#include <sys/klog.h> /* klogctl() */
84
#endif /* __linux__ */
85
86
/* Avahi */
87
/* All Avahi types, constants and functions
88
Avahi*, avahi_*,
89
AVAHI_* */
41
90
#include <avahi-core/core.h>
42
91
#include <avahi-core/lookup.h>
43
92
#include <avahi-core/log.h>
45
94
#include <avahi-common/malloc.h>
46
95
#include <avahi-common/error.h>
47
96
48
//mandos client part
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
54
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
61
62
// gpgme
63
#include <errno.h> /* perror() */
64
#include <gpgme.h>
65
66
// getopt long
67
#include <getopt.h>
97
/* GnuTLS */
98
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
99
functions:
100
gnutls_*
101
init_gnutls_session(),
102
GNUTLS_* */
103
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
106
107
/* GPGME */
108
#include <gpgme.h> /* All GPGME types, constants and
109
functions:
110
gpgme_*
111
GPGME_PROTOCOL_OpenPGP,
112
GPG_ERR_NO_* */
68
113
69
114
#define BUFFER_SIZE 256
70
#define DH_BITS 1024
71
115
72
const char *certdir = "/conf/conf.d/cryptkeyreq/";
73
const char *certfile = "openpgp-client.txt";
74
const char *certkey = "openpgp-client-key.txt";
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
75
119
76
120
bool debug = false;
121
static const char mandos_protocol_version[] = "1";
122
const char *argp_program_version = "mandos-client " VERSION;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
124
125
/* Used for passing in values through the Avahi callback functions */
78
126
typedef struct {
79
gnutls_session_t session;
127
AvahiSimplePoll *simple_poll;
128
AvahiServer *server;
80
129
gnutls_certificate_credentials_t cred;
130
unsigned int dh_bits;
81
131
gnutls_dh_params_t dh_params;
82
} encrypted_session;
83
84
85
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
char **new_packet, const char *homedir){
87
gpgme_data_t dh_crypto, dh_plain;
132
const char *priority;
88
133
gpgme_ctx_t ctx;
134
} mandos_context;
135
136
/* global context so signal handler can reach it*/
137
mandos_context mc;
138
139
/*
140
* Make additional room in "buffer" for at least BUFFER_SIZE more
141
* bytes. "buffer_capacity" is how much is currently allocated,
142
* "buffer_length" is how much is already used.
143
*/
144
size_t incbuffer(char **buffer, size_t buffer_length,
145
size_t buffer_capacity){
146
if(buffer_length + BUFFER_SIZE > buffer_capacity){
147
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
148
if(buffer == NULL){
149
return 0;
150
}
151
buffer_capacity += BUFFER_SIZE;
152
}
153
return buffer_capacity;
154
}
155
156
/*
157
* Initialize GPGME.
158
*/
159
static bool init_gpgme(const char *seckey,
160
const char *pubkey, const char *tempdir){
161
int ret;
89
162
gpgme_error_t rc;
90
ssize_t ret;
91
ssize_t new_packet_capacity = 0;
92
ssize_t new_packet_length = 0;
93
163
gpgme_engine_info_t engine_info;
94
95
if (debug){
96
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
164
165
166
/*
167
* Helper function to insert pub and seckey to the engine keyring.
168
*/
169
bool import_key(const char *filename){
170
int fd;
171
gpgme_data_t pgp_data;
172
173
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
174
if(fd == -1){
175
perror("open");
176
return false;
177
}
178
179
rc = gpgme_data_new_from_fd(&pgp_data, fd);
180
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
183
return false;
184
}
185
186
rc = gpgme_op_import(mc.ctx, pgp_data);
187
if(rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
189
gpgme_strsource(rc), gpgme_strerror(rc));
190
return false;
191
}
192
193
ret = (int)TEMP_FAILURE_RETRY(close(fd));
194
if(ret == -1){
195
perror("close");
196
}
197
gpgme_data_release(pgp_data);
198
return true;
199
}
200
201
if(debug){
202
fprintf(stderr, "Initializing GPGME\n");
97
203
}
98
204
99
205
/* Init GPGME */
100
206
gpgme_check_version(NULL);
101
207
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
102
if (rc != GPG_ERR_NO_ERROR){
208
if(rc != GPG_ERR_NO_ERROR){
103
209
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
104
210
gpgme_strsource(rc), gpgme_strerror(rc));
105
return -1;
211
return false;
106
212
}
107
213
108
/* Set GPGME home directory */
109
rc = gpgme_get_engine_info (&engine_info);
110
if (rc != GPG_ERR_NO_ERROR){
214
/* Set GPGME home directory for the OpenPGP engine only */
215
rc = gpgme_get_engine_info(&engine_info);
216
if(rc != GPG_ERR_NO_ERROR){
111
217
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
112
218
gpgme_strsource(rc), gpgme_strerror(rc));
113
return -1;
219
return false;
114
220
}
115
221
while(engine_info != NULL){
116
222
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
117
223
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
118
engine_info->file_name, homedir);
224
engine_info->file_name, tempdir);
119
225
break;
120
226
}
121
227
engine_info = engine_info->next;
122
228
}
123
229
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
125
return -1;
126
}
127
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
130
if (rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
231
return false;
232
}
233
234
/* Create new GPGME "context" */
235
rc = gpgme_new(&(mc.ctx));
236
if(rc != GPG_ERR_NO_ERROR){
237
fprintf(stderr, "bad gpgme_new: %s: %s\n",
238
gpgme_strsource(rc), gpgme_strerror(rc));
239
return false;
240
}
241
242
if(not import_key(pubkey) or not import_key(seckey)){
243
return false;
244
}
245
246
return true;
247
}
248
249
/*
250
* Decrypt OpenPGP data.
251
* Returns -1 on error
252
*/
253
static ssize_t pgp_packet_decrypt(const char *cryptotext,
254
size_t crypto_size,
255
char **plaintext){
256
gpgme_data_t dh_crypto, dh_plain;
257
gpgme_error_t rc;
258
ssize_t ret;
259
size_t plaintext_capacity = 0;
260
ssize_t plaintext_length = 0;
261
262
if(debug){
263
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
264
}
265
266
/* Create new GPGME data buffer from memory cryptotext */
267
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
268
0);
269
if(rc != GPG_ERR_NO_ERROR){
131
270
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
271
gpgme_strsource(rc), gpgme_strerror(rc));
133
272
return -1;
135
274
136
275
/* Create new empty GPGME data buffer for the plaintext */
137
276
rc = gpgme_data_new(&dh_plain);
138
if (rc != GPG_ERR_NO_ERROR){
277
if(rc != GPG_ERR_NO_ERROR){
139
278
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
279
gpgme_strsource(rc), gpgme_strerror(rc));
141
return -1;
142
}
143
144
/* Create new GPGME "context" */
145
rc = gpgme_new(&ctx);
146
if (rc != GPG_ERR_NO_ERROR){
147
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
gpgme_strsource(rc), gpgme_strerror(rc));
149
return -1;
150
}
151
152
/* Decrypt data from the FILE pointer to the plaintext data
153
buffer */
154
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
if (rc != GPG_ERR_NO_ERROR){
280
gpgme_data_release(dh_crypto);
281
return -1;
282
}
283
284
/* Decrypt data from the cryptotext data buffer to the plaintext
285
data buffer */
286
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
287
if(rc != GPG_ERR_NO_ERROR){
156
288
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
289
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
290
plaintext_length = -1;
291
if(debug){
292
gpgme_decrypt_result_t result;
293
result = gpgme_op_decrypt_result(mc.ctx);
294
if(result == NULL){
295
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
296
} else {
297
fprintf(stderr, "Unsupported algorithm: %s\n",
298
result->unsupported_algorithm);
299
fprintf(stderr, "Wrong key usage: %u\n",
300
result->wrong_key_usage);
301
if(result->file_name != NULL){
302
fprintf(stderr, "File name: %s\n", result->file_name);
303
}
304
gpgme_recipient_t recipient;
305
recipient = result->recipients;
306
if(recipient){
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
313
? "No" : "Yes");
314
recipient = recipient->next;
315
}
316
}
317
}
318
}
319
goto decrypt_end;
159
320
}
160
321
161
322
if(debug){
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
163
}
164
165
if (debug){
166
gpgme_decrypt_result_t result;
167
result = gpgme_op_decrypt_result(ctx);
168
if (result == NULL){
169
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
170
} else {
171
fprintf(stderr, "Unsupported algorithm: %s\n",
172
result->unsupported_algorithm);
173
fprintf(stderr, "Wrong key usage: %d\n",
174
result->wrong_key_usage);
175
if(result->file_name != NULL){
176
fprintf(stderr, "File name: %s\n", result->file_name);
177
}
178
gpgme_recipient_t recipient;
179
recipient = result->recipients;
180
if(recipient){
181
while(recipient != NULL){
182
fprintf(stderr, "Public key algorithm: %s\n",
183
gpgme_pubkey_algo_name(recipient->pubkey_algo));
184
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
185
fprintf(stderr, "Secret key available: %s\n",
186
recipient->status == GPG_ERR_NO_SECKEY
187
? "No" : "Yes");
188
recipient = recipient->next;
189
}
190
}
191
}
192
}
193
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
323
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
324
}
196
325
197
326
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
199
perror("pgpme_data_seek");
327
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
328
perror("gpgme_data_seek");
329
plaintext_length = -1;
330
goto decrypt_end;
200
331
}
201
332
202
*new_packet = 0;
333
*plaintext = NULL;
203
334
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;
335
plaintext_capacity = incbuffer(plaintext,
336
(size_t)plaintext_length,
337
plaintext_capacity);
338
if(plaintext_capacity == 0){
339
perror("incbuffer");
340
plaintext_length = -1;
341
goto decrypt_end;
213
342
}
214
343
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
344
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
345
BUFFER_SIZE);
217
346
/* Print the data, if any */
218
if (ret == 0){
347
if(ret == 0){
348
/* EOF */
219
349
break;
220
350
}
221
351
if(ret < 0){
222
352
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
/* } */
353
plaintext_length = -1;
354
goto decrypt_end;
355
}
356
plaintext_length += ret;
357
}
358
359
if(debug){
360
fprintf(stderr, "Decrypted password is: ");
361
for(ssize_t i = 0; i < plaintext_length; i++){
362
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
363
}
364
fprintf(stderr, "\n");
365
}
366
367
decrypt_end:
368
369
/* Delete the GPGME cryptotext data buffer */
370
gpgme_data_release(dh_crypto);
235
371
236
372
/* Delete the GPGME plaintext data buffer */
237
373
gpgme_data_release(dh_plain);
238
return new_packet_length;
374
return plaintext_length;
239
375
}
240
376
241
static const char * safer_gnutls_strerror (int value) {
242
const char *ret = gnutls_strerror (value);
243
if (ret == NULL)
377
static const char * safer_gnutls_strerror(int value){
378
const char *ret = gnutls_strerror(value); /* Spurious warning from
379
-Wunreachable-code */
380
if(ret == NULL)
244
381
ret = "(unknown)";
245
382
return ret;
246
383
}
247
384
248
void debuggnutls(__attribute__((unused)) int level,
249
const char* string){
250
fprintf(stderr, "%s", string);
385
/* GnuTLS log function callback */
386
static void debuggnutls(__attribute__((unused)) int level,
387
const char* string){
388
fprintf(stderr, "GnuTLS: %s", string);
251
389
}
252
390
253
int initgnutls(encrypted_session *es){
254
const char *err;
391
static int init_gnutls_global(const char *pubkeyfilename,
392
const char *seckeyfilename){
255
393
int ret;
256
394
257
395
if(debug){
258
396
fprintf(stderr, "Initializing GnuTLS\n");
259
397
}
260
261
if ((ret = gnutls_global_init ())
262
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
398
399
ret = gnutls_global_init();
400
if(ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "GnuTLS global_init: %s\n",
402
safer_gnutls_strerror(ret));
264
403
return -1;
265
404
}
266
267
if (debug){
405
406
if(debug){
407
/* "Use a log level over 10 to enable all debugging options."
408
* - GnuTLS manual
409
*/
268
410
gnutls_global_set_log_level(11);
269
411
gnutls_global_set_log_function(debuggnutls);
270
412
}
271
413
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));
414
/* OpenPGP credentials */
415
gnutls_certificate_allocate_credentials(&mc.cred);
416
if(ret != GNUTLS_E_SUCCESS){
417
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
418
from
419
-Wunreachable-code
420
*/
421
safer_gnutls_strerror(ret));
422
gnutls_global_deinit();
277
423
return -1;
278
424
}
279
425
280
426
if(debug){
281
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
283
certkey);
427
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
428
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
429
seckeyfilename);
284
430
}
285
431
286
432
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){
433
(mc.cred, pubkeyfilename, seckeyfilename,
434
GNUTLS_OPENPGP_FMT_BASE64);
435
if(ret != GNUTLS_E_SUCCESS){
436
fprintf(stderr,
437
"Error[%d] while reading the OpenPGP key pair ('%s',"
438
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
439
fprintf(stderr, "The GnuTLS error is: %s\n",
440
safer_gnutls_strerror(ret));
441
goto globalfail;
442
}
443
444
/* GnuTLS server initialization */
445
ret = gnutls_dh_params_init(&mc.dh_params);
446
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
448
" %s\n", safer_gnutls_strerror(ret));
449
goto globalfail;
450
}
451
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
454
safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
458
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
459
460
return 0;
461
462
globalfail:
463
464
gnutls_certificate_free_credentials(mc.cred);
465
gnutls_global_deinit();
466
gnutls_dh_params_deinit(mc.dh_params);
467
return -1;
468
}
469
470
static int init_gnutls_session(gnutls_session_t *session){
471
int ret;
472
/* GnuTLS session creation */
473
ret = gnutls_init(session, GNUTLS_SERVER);
474
if(ret != GNUTLS_E_SUCCESS){
318
475
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
476
safer_gnutls_strerror(ret));
320
477
}
321
478
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;
479
{
480
const char *err;
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
482
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "Syntax error at: %s\n", err);
484
fprintf(stderr, "GnuTLS error: %s\n",
485
safer_gnutls_strerror(ret));
486
gnutls_deinit(*session);
487
return -1;
488
}
328
489
}
329
490
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",
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
492
mc.cred);
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
495
safer_gnutls_strerror(ret));
496
gnutls_deinit(*session);
335
497
return -1;
336
498
}
337
499
338
500
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
340
GNUTLS_CERT_IGNORE);
501
gnutls_certificate_server_set_request(*session,
502
GNUTLS_CERT_IGNORE);
341
503
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
504
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
343
505
344
506
return 0;
345
507
}
346
508
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
509
/* Avahi log function callback */
510
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
511
__attribute__((unused)) const char *txt){}
349
512
350
int start_mandos_communication(const char *ip, uint16_t port,
351
AvahiIfIndex if_index){
513
/* Called when a Mandos server is found */
514
static int start_mandos_communication(const char *ip, uint16_t port,
515
AvahiIfIndex if_index,
516
int af){
352
517
int ret, tcp_sd;
353
struct sockaddr_in6 to;
354
encrypted_session es;
518
ssize_t sret;
519
union {
520
struct sockaddr_in in;
521
struct sockaddr_in6 in6;
522
} to;
355
523
char *buffer = NULL;
356
524
char *decrypted_buffer;
357
525
size_t buffer_length = 0;
358
526
size_t buffer_capacity = 0;
359
527
ssize_t decrypted_buffer_size;
360
size_t written = 0;
528
size_t written;
361
529
int retval = 0;
362
char interface[IF_NAMESIZE];
530
gnutls_session_t session;
531
int pf; /* Protocol family */
532
533
switch(af){
534
case AF_INET6:
535
pf = PF_INET6;
536
break;
537
case AF_INET:
538
pf = PF_INET;
539
break;
540
default:
541
fprintf(stderr, "Bad address family: %d\n", af);
542
return -1;
543
}
544
545
ret = init_gnutls_session(&session);
546
if(ret != 0){
547
return -1;
548
}
363
549
364
550
if(debug){
365
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
366
ip, port);
551
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
552
"\n", ip, port);
367
553
}
368
554
369
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
370
if(tcp_sd < 0) {
555
tcp_sd = socket(pf, SOCK_STREAM, 0);
556
if(tcp_sd < 0){
371
557
perror("socket");
372
558
return -1;
373
559
}
374
560
375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(debug){
377
perror("if_indextoname");
378
}
379
return -1;
380
}
381
382
if(debug){
383
fprintf(stderr, "Binding to interface %s\n", interface);
384
}
385
386
memset(&to,0,sizeof(to)); /* Spurious warning */
387
to.sin6_family = AF_INET6;
388
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
389
if (ret < 0 ){
561
memset(&to, 0, sizeof(to));
562
if(af == AF_INET6){
563
to.in6.sin6_family = (uint16_t)af;
564
ret = inet_pton(af, ip, &to.in6.sin6_addr);
565
} else { /* IPv4 */
566
to.in.sin_family = (sa_family_t)af;
567
ret = inet_pton(af, ip, &to.in.sin_addr);
568
}
569
if(ret < 0 ){
390
570
perror("inet_pton");
391
571
return -1;
392
}
572
}
393
573
if(ret == 0){
394
574
fprintf(stderr, "Bad address: %s\n", ip);
395
575
return -1;
396
576
}
397
to.sin6_port = htons(port); /* Spurious warning */
398
399
to.sin6_scope_id = (uint32_t)if_index;
577
if(af == AF_INET6){
578
to.in6.sin6_port = htons(port); /* Spurious warnings from
579
-Wconversion and
580
-Wunreachable-code */
581
582
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
583
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
584
-Wunreachable-code*/
585
if(if_index == AVAHI_IF_UNSPEC){
586
fprintf(stderr, "An IPv6 link-local address is incomplete"
587
" without a network interface\n");
588
return -1;
589
}
590
/* Set the network interface number as scope */
591
to.in6.sin6_scope_id = (uint32_t)if_index;
592
}
593
} else {
594
to.in.sin_port = htons(port); /* Spurious warnings from
595
-Wconversion and
596
-Wunreachable-code */
597
}
400
598
401
599
if(debug){
402
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
403
/* char addrstr[INET6_ADDRSTRLEN]; */
404
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
405
/* sizeof(addrstr)) == NULL){ */
406
/* perror("inet_ntop"); */
407
/* } else { */
408
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
409
/* addrstr, ntohs(to.sin6_port)); */
410
/* } */
600
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
601
char interface[IF_NAMESIZE];
602
if(if_indextoname((unsigned int)if_index, interface) == NULL){
603
perror("if_indextoname");
604
} else {
605
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
606
ip, interface, port);
607
}
608
} else {
609
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
610
port);
611
}
612
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
613
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
614
const char *pcret;
615
if(af == AF_INET6){
616
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
617
sizeof(addrstr));
618
} else {
619
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
620
sizeof(addrstr));
621
}
622
if(pcret == NULL){
623
perror("inet_ntop");
624
} else {
625
if(strcmp(addrstr, ip) != 0){
626
fprintf(stderr, "Canonical address form: %s\n", addrstr);
627
}
628
}
411
629
}
412
630
413
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
414
if (ret < 0){
631
if(af == AF_INET6){
632
ret = connect(tcp_sd, &to.in6, sizeof(to));
633
} else {
634
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
635
}
636
if(ret < 0){
415
637
perror("connect");
416
638
return -1;
417
639
}
418
640
419
ret = initgnutls (&es);
420
if (ret != 0){
421
retval = -1;
422
return -1;
641
const char *out = mandos_protocol_version;
642
written = 0;
643
while(true){
644
size_t out_size = strlen(out);
645
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
646
out_size - written));
647
if(ret == -1){
648
perror("write");
649
retval = -1;
650
goto mandos_end;
651
}
652
written += (size_t)ret;
653
if(written < out_size){
654
continue;
655
} else {
656
if(out == mandos_protocol_version){
657
written = 0;
658
out = "\r\n";
659
} else {
660
break;
661
}
662
}
423
663
}
424
664
425
gnutls_transport_set_ptr (es.session,
426
(gnutls_transport_ptr_t) tcp_sd);
427
428
665
if(debug){
429
666
fprintf(stderr, "Establishing TLS session with %s\n", ip);
430
667
}
431
668
432
ret = gnutls_handshake (es.session);
433
434
if (ret != GNUTLS_E_SUCCESS){
669
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
670
671
do{
672
ret = gnutls_handshake(session);
673
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
674
675
if(ret != GNUTLS_E_SUCCESS){
435
676
if(debug){
436
fprintf(stderr, "\n*** Handshake failed ***\n");
437
gnutls_perror (ret);
677
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
678
gnutls_perror(ret);
438
679
}
439
680
retval = -1;
440
goto exit;
681
goto mandos_end;
441
682
}
442
683
443
//Retrieve OpenPGP packet that contains the wanted password
684
/* Read OpenPGP packet that contains the wanted password */
444
685
445
686
if(debug){
446
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
687
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
447
688
ip);
448
689
}
449
690
450
691
while(true){
451
if (buffer_length + BUFFER_SIZE > buffer_capacity){
452
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
453
if (buffer == NULL){
454
perror("realloc");
455
goto exit;
456
}
457
buffer_capacity += BUFFER_SIZE;
692
buffer_capacity = incbuffer(&buffer, buffer_length,
693
buffer_capacity);
694
if(buffer_capacity == 0){
695
perror("incbuffer");
696
retval = -1;
697
goto mandos_end;
458
698
}
459
699
460
ret = gnutls_record_recv
461
(es.session, buffer+buffer_length, BUFFER_SIZE);
462
if (ret == 0){
700
sret = gnutls_record_recv(session, buffer+buffer_length,
701
BUFFER_SIZE);
702
if(sret == 0){
463
703
break;
464
704
}
465
if (ret < 0){
466
switch(ret){
705
if(sret < 0){
706
switch(sret){
467
707
case GNUTLS_E_INTERRUPTED:
468
708
case GNUTLS_E_AGAIN:
469
709
break;
470
710
case GNUTLS_E_REHANDSHAKE:
471
ret = gnutls_handshake (es.session);
472
if (ret < 0){
473
fprintf(stderr, "\n*** Handshake failed ***\n");
474
gnutls_perror (ret);
711
do{
712
ret = gnutls_handshake(session);
713
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
714
if(ret < 0){
715
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
716
gnutls_perror(ret);
475
717
retval = -1;
476
goto exit;
718
goto mandos_end;
477
719
}
478
720
break;
479
721
default:
480
722
fprintf(stderr, "Unknown error while reading data from"
481
" encrypted session with mandos server\n");
723
" encrypted session with Mandos server\n");
482
724
retval = -1;
483
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
484
goto exit;
725
gnutls_bye(session, GNUTLS_SHUT_RDWR);
726
goto mandos_end;
485
727
}
486
728
} else {
487
buffer_length += (size_t) ret;
729
buffer_length += (size_t) sret;
488
730
}
489
731
}
490
732
491
if (buffer_length > 0){
733
if(debug){
734
fprintf(stderr, "Closing TLS session\n");
735
}
736
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
738
739
if(buffer_length > 0){
492
740
decrypted_buffer_size = pgp_packet_decrypt(buffer,
493
741
buffer_length,
494
&decrypted_buffer,
495
certdir);
496
if (decrypted_buffer_size >= 0){
742
&decrypted_buffer);
743
if(decrypted_buffer_size >= 0){
744
written = 0;
497
745
while(written < (size_t) decrypted_buffer_size){
498
ret = (int)fwrite (decrypted_buffer + written, 1,
499
(size_t)decrypted_buffer_size - written,
500
stdout);
746
ret = (int)fwrite(decrypted_buffer + written, 1,
747
(size_t)decrypted_buffer_size - written,
748
stdout);
501
749
if(ret == 0 and ferror(stdout)){
502
750
if(debug){
503
751
fprintf(stderr, "Error writing encrypted data: %s\n",
512
760
} else {
513
761
retval = -1;
514
762
}
515
}
516
517
//shutdown procedure
518
519
if(debug){
520
fprintf(stderr, "Closing TLS session\n");
521
}
522
763
} else {
764
retval = -1;
765
}
766
767
/* Shutdown procedure */
768
769
mandos_end:
523
770
free(buffer);
524
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
525
exit:
526
close(tcp_sd);
527
gnutls_deinit (es.session);
528
gnutls_certificate_free_credentials (es.cred);
529
gnutls_global_deinit ();
771
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
772
if(ret == -1){
773
perror("close");
774
}
775
gnutls_deinit(session);
530
776
return retval;
531
777
}
532
778
533
static AvahiSimplePoll *simple_poll = NULL;
534
static AvahiServer *server = NULL;
535
536
static void resolve_callback(
537
AvahiSServiceResolver *r,
538
AvahiIfIndex interface,
539
AVAHI_GCC_UNUSED AvahiProtocol protocol,
540
AvahiResolverEvent event,
541
const char *name,
542
const char *type,
543
const char *domain,
544
const char *host_name,
545
const AvahiAddress *address,
546
uint16_t port,
547
AVAHI_GCC_UNUSED AvahiStringList *txt,
548
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
549
AVAHI_GCC_UNUSED void* userdata) {
550
551
assert(r); /* Spurious warning */
779
static void resolve_callback(AvahiSServiceResolver *r,
780
AvahiIfIndex interface,
781
AvahiProtocol proto,
782
AvahiResolverEvent event,
783
const char *name,
784
const char *type,
785
const char *domain,
786
const char *host_name,
787
const AvahiAddress *address,
788
uint16_t port,
789
AVAHI_GCC_UNUSED AvahiStringList *txt,
790
AVAHI_GCC_UNUSED AvahiLookupResultFlags
791
flags,
792
AVAHI_GCC_UNUSED void* userdata){
793
assert(r);
552
794
553
795
/* Called whenever a service has been resolved successfully or
554
796
timed out */
555
797
556
switch (event) {
798
switch(event){
557
799
default:
558
800
case AVAHI_RESOLVER_FAILURE:
559
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
560
" type '%s' in domain '%s': %s\n", name, type, domain,
561
avahi_strerror(avahi_server_errno(server)));
801
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
802
" of type '%s' in domain '%s': %s\n", name, type, domain,
803
avahi_strerror(avahi_server_errno(mc.server)));
562
804
break;
563
805
564
806
case AVAHI_RESOLVER_FOUND:
566
808
char ip[AVAHI_ADDRESS_STR_MAX];
567
809
avahi_address_snprint(ip, sizeof(ip), address);
568
810
if(debug){
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
811
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
812
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
813
ip, (intmax_t)interface, port);
571
814
}
572
int ret = start_mandos_communication(ip, port, interface);
573
if (ret == 0){
574
exit(EXIT_SUCCESS);
815
int ret = start_mandos_communication(ip, port, interface,
816
avahi_proto_to_af(proto));
817
if(ret == 0){
818
avahi_simple_poll_quit(mc.simple_poll);
575
819
}
576
820
}
577
821
}
578
822
avahi_s_service_resolver_free(r);
579
823
}
580
824
581
static void browse_callback(
582
AvahiSServiceBrowser *b,
583
AvahiIfIndex interface,
584
AvahiProtocol protocol,
585
AvahiBrowserEvent event,
586
const char *name,
587
const char *type,
588
const char *domain,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
void* userdata) {
591
592
AvahiServer *s = userdata;
593
assert(b); /* Spurious warning */
594
595
/* Called whenever a new services becomes available on the LAN or
596
is removed from the LAN */
597
598
switch (event) {
599
default:
600
case AVAHI_BROWSER_FAILURE:
601
602
fprintf(stderr, "(Browser) %s\n",
603
avahi_strerror(avahi_server_errno(server)));
604
avahi_simple_poll_quit(simple_poll);
605
return;
606
607
case AVAHI_BROWSER_NEW:
608
/* We ignore the returned resolver object. In the callback
609
function we free it. If the server is terminated before
610
the callback function is called the server will free
611
the resolver for us. */
612
613
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
614
type, domain,
615
AVAHI_PROTO_INET6, 0,
616
resolve_callback, s)))
617
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
618
avahi_strerror(avahi_server_errno(s)));
619
break;
620
621
case AVAHI_BROWSER_REMOVE:
622
break;
623
624
case AVAHI_BROWSER_ALL_FOR_NOW:
625
case AVAHI_BROWSER_CACHE_EXHAUSTED:
626
break;
627
}
628
}
629
630
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
631
const char *combinepath(const char *first, const char *second){
632
char *tmp;
633
tmp = malloc(strlen(first) + strlen(second) + 2);
634
if (tmp == NULL){
635
perror("malloc");
636
return NULL;
637
}
638
strcpy(tmp, first);
639
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
640
strcat(tmp, "/");
641
}
642
strcat(tmp, second);
643
return tmp;
644
}
645
646
647
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
825
static void browse_callback(AvahiSServiceBrowser *b,
826
AvahiIfIndex interface,
827
AvahiProtocol protocol,
828
AvahiBrowserEvent event,
829
const char *name,
830
const char *type,
831
const char *domain,
832
AVAHI_GCC_UNUSED AvahiLookupResultFlags
833
flags,
834
AVAHI_GCC_UNUSED void* userdata){
835
assert(b);
836
837
/* Called whenever a new services becomes available on the LAN or
838
is removed from the LAN */
839
840
switch(event){
841
default:
842
case AVAHI_BROWSER_FAILURE:
843
844
fprintf(stderr, "(Avahi browser) %s\n",
845
avahi_strerror(avahi_server_errno(mc.server)));
846
avahi_simple_poll_quit(mc.simple_poll);
847
return;
848
849
case AVAHI_BROWSER_NEW:
850
/* We ignore the returned Avahi resolver object. In the callback
851
function we free it. If the Avahi server is terminated before
852
the callback function is called the Avahi server will free the
853
resolver for us. */
854
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
856
protocol, name, type, domain,
857
AVAHI_PROTO_INET6, 0,
858
resolve_callback, NULL)))
859
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
860
name, avahi_strerror(avahi_server_errno(mc.server)));
861
break;
862
863
case AVAHI_BROWSER_REMOVE:
864
break;
865
866
case AVAHI_BROWSER_ALL_FOR_NOW:
867
case AVAHI_BROWSER_CACHE_EXHAUSTED:
868
if(debug){
869
fprintf(stderr, "No Mandos server found, still searching...\n");
870
}
871
break;
872
}
873
}
874
875
sig_atomic_t quit_now = 0;
876
877
static void handle_sigterm(__attribute__((unused)) int sig){
878
if(quit_now){
879
return;
880
}
881
quit_now = 1;
882
int old_errno = errno;
883
if(mc.simple_poll != NULL){
884
avahi_simple_poll_quit(mc.simple_poll);
885
}
886
errno = old_errno;
887
}
888
889
int main(int argc, char *argv[]){
890
AvahiSServiceBrowser *sb = NULL;
891
int error;
892
int ret;
893
intmax_t tmpmax;
894
int numchars;
895
int exitcode = EXIT_SUCCESS;
896
const char *interface = "eth0";
897
struct ifreq network;
898
int sd;
899
uid_t uid;
900
gid_t gid;
901
char *connect_to = NULL;
902
char tempdir[] = "/tmp/mandosXXXXXX";
903
bool tempdir_created = false;
904
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
905
const char *seckey = PATHDIR "/" SECKEY;
906
const char *pubkey = PATHDIR "/" PUBKEY;
907
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
912
bool gnutls_initialized = false;
913
bool gpgme_initialized = false;
914
double delay = 2.5;
915
916
struct sigaction old_sigterm_action;
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
919
{
920
struct argp_option options[] = {
921
{ .name = "debug", .key = 128,
922
.doc = "Debug mode", .group = 3 },
923
{ .name = "connect", .key = 'c',
924
.arg = "ADDRESS:PORT",
925
.doc = "Connect directly to a specific Mandos server",
926
.group = 1 },
927
{ .name = "interface", .key = 'i',
928
.arg = "NAME",
929
.doc = "Network interface that will be used to search for"
930
" Mandos servers",
931
.group = 1 },
932
{ .name = "seckey", .key = 's',
933
.arg = "FILE",
934
.doc = "OpenPGP secret key file base name",
935
.group = 1 },
936
{ .name = "pubkey", .key = 'p',
937
.arg = "FILE",
938
.doc = "OpenPGP public key file base name",
939
.group = 2 },
940
{ .name = "dh-bits", .key = 129,
941
.arg = "BITS",
942
.doc = "Bit length of the prime number used in the"
943
" Diffie-Hellman key exchange",
944
.group = 2 },
945
{ .name = "priority", .key = 130,
946
.arg = "STRING",
947
.doc = "GnuTLS priority string for the TLS handshake",
948
.group = 1 },
949
{ .name = "delay", .key = 131,
950
.arg = "SECONDS",
951
.doc = "Maximum delay to wait for interface startup",
952
.group = 2 },
953
{ .name = NULL }
954
};
955
956
error_t parse_opt(int key, char *arg,
957
struct argp_state *state){
958
switch(key){
959
case 128: /* --debug */
960
debug = true;
961
break;
962
case 'c': /* --connect */
963
connect_to = arg;
964
break;
965
case 'i': /* --interface */
966
interface = arg;
967
break;
968
case 's': /* --seckey */
969
seckey = arg;
970
break;
971
case 'p': /* --pubkey */
972
pubkey = arg;
973
break;
974
case 129: /* --dh-bits */
975
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
978
fprintf(stderr, "Bad number of DH bits\n");
979
exit(EXIT_FAILURE);
980
}
981
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
982
break;
983
case 130: /* --priority */
984
mc.priority = arg;
985
break;
986
case 131: /* --delay */
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
996
break;
997
default:
998
return ARGP_ERR_UNKNOWN;
999
}
1000
return 0;
1001
}
1002
1003
struct argp argp = { .options = options, .parser = parse_opt,
1004
.args_doc = "",
1005
.doc = "Mandos client -- Get and decrypt"
1006
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
1013
}
1014
1015
/* If the interface is down, bring it up */
1016
if(interface[0] != '\0'){
1017
#ifdef __linux__
1018
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1019
messages to mess up the prompt */
1020
ret = klogctl(8, NULL, 5);
1021
bool restore_loglevel = true;
1022
if(ret == -1){
1023
restore_loglevel = false;
1024
perror("klogctl");
1025
}
1026
#endif /* __linux__ */
1027
1028
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1029
if(sd < 0){
1030
perror("socket");
1031
exitcode = EXIT_FAILURE;
1032
#ifdef __linux__
1033
if(restore_loglevel){
1034
ret = klogctl(7, NULL, 0);
1035
if(ret == -1){
1036
perror("klogctl");
1037
}
1038
}
1039
#endif /* __linux__ */
1040
goto end;
1041
}
1042
strcpy(network.ifr_name, interface);
1043
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1044
if(ret == -1){
1045
perror("ioctl SIOCGIFFLAGS");
1046
#ifdef __linux__
1047
if(restore_loglevel){
1048
ret = klogctl(7, NULL, 0);
1049
if(ret == -1){
1050
perror("klogctl");
1051
}
1052
}
1053
#endif /* __linux__ */
1054
exitcode = EXIT_FAILURE;
1055
goto end;
1056
}
1057
if((network.ifr_flags & IFF_UP) == 0){
1058
network.ifr_flags |= IFF_UP;
1059
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1060
if(ret == -1){
1061
perror("ioctl SIOCSIFFLAGS");
1062
exitcode = EXIT_FAILURE;
1063
#ifdef __linux__
1064
if(restore_loglevel){
1065
ret = klogctl(7, NULL, 0);
1066
if(ret == -1){
1067
perror("klogctl");
1068
}
1069
}
1070
#endif /* __linux__ */
1071
goto end;
1072
}
1073
}
1074
/* sleep checking until interface is running */
1075
for(int i=0; i < delay * 4; i++){
1076
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1077
if(ret == -1){
1078
perror("ioctl SIOCGIFFLAGS");
1079
} else if(network.ifr_flags & IFF_RUNNING){
1080
break;
1081
}
1082
struct timespec sleeptime = { .tv_nsec = 250000000 };
1083
ret = nanosleep(&sleeptime, NULL);
1084
if(ret == -1 and errno != EINTR){
1085
perror("nanosleep");
1086
}
1087
}
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1089
if(ret == -1){
1090
perror("close");
1091
}
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
/* Restores kernel loglevel to default */
1095
ret = klogctl(7, NULL, 0);
1096
if(ret == -1){
1097
perror("klogctl");
1098
}
1099
}
1100
#endif /* __linux__ */
1101
}
1102
1103
uid = getuid();
1104
gid = getgid();
1105
1106
errno = 0;
1107
setgid(gid);
1108
if(ret == -1){
1109
perror("setgid");
1110
}
1111
1112
ret = setuid(uid);
1113
if(ret == -1){
1114
perror("setuid");
1115
}
1116
1117
ret = init_gnutls_global(pubkey, seckey);
1118
if(ret == -1){
1119
fprintf(stderr, "init_gnutls_global failed\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
} else {
1123
gnutls_initialized = true;
1124
}
1125
1126
if(mkdtemp(tempdir) == NULL){
1127
perror("mkdtemp");
1128
goto end;
1129
}
1130
tempdir_created = true;
1131
1132
if(not init_gpgme(pubkey, seckey, tempdir)){
1133
fprintf(stderr, "init_gpgme failed\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
} else {
1137
gpgme_initialized = true;
1138
}
1139
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1142
if(if_index == 0){
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
}
1148
1149
if(connect_to != NULL){
1150
/* Connect directly, do not use Zeroconf */
1151
/* (Mainly meant for debugging) */
1152
char *address = strrchr(connect_to, ':');
1153
if(address == NULL){
1154
fprintf(stderr, "No colon in address\n");
1155
exitcode = EXIT_FAILURE;
1156
goto end;
1157
}
1158
uint16_t port;
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1162
fprintf(stderr, "Bad port number\n");
1163
exitcode = EXIT_FAILURE;
1164
goto end;
1165
}
1166
port = (uint16_t)tmpmax;
1167
*address = '\0';
1168
address = connect_to;
1169
/* Colon in address indicates IPv6 */
1170
int af;
1171
if(strchr(address, ':') != NULL){
1172
af = AF_INET6;
1173
} else {
1174
af = AF_INET;
1175
}
1176
ret = start_mandos_communication(address, port, if_index, af);
1177
if(ret < 0){
1178
exitcode = EXIT_FAILURE;
1179
} else {
1180
exitcode = EXIT_SUCCESS;
1181
}
1182
goto end;
1183
}
1184
1185
if(not debug){
1186
avahi_set_log_function(empty_log);
1187
}
1188
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1191
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
1200
{
648
1201
AvahiServerConfig config;
649
AvahiSServiceBrowser *sb = NULL;
650
int error;
651
int ret;
652
int returncode = EXIT_SUCCESS;
653
const char *interface = NULL;
654
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
655
char *connect_to = NULL;
656
657
while (true){
658
static struct option long_options[] = {
659
{"debug", no_argument, (int *)&debug, 1},
660
{"connect", required_argument, 0, 'C'},
661
{"interface", required_argument, 0, 'i'},
662
{"certdir", required_argument, 0, 'd'},
663
{"certkey", required_argument, 0, 'c'},
664
{"certfile", required_argument, 0, 'k'},
665
{0, 0, 0, 0} };
666
667
int option_index = 0;
668
ret = getopt_long (argc, argv, "i:", long_options,
669
&option_index);
670
671
if (ret == -1){
672
break;
673
}
674
675
switch(ret){
676
case 0:
677
break;
678
case 'i':
679
interface = optarg;
680
break;
681
case 'C':
682
connect_to = optarg;
683
break;
684
case 'd':
685
certdir = optarg;
686
break;
687
case 'c':
688
certfile = optarg;
689
break;
690
case 'k':
691
certkey = optarg;
692
break;
693
default:
694
exit(EXIT_FAILURE);
695
}
696
}
697
698
certfile = combinepath(certdir, certfile);
699
if (certfile == NULL){
700
goto exit;
701
}
702
703
if(interface != NULL){
704
if_index = (AvahiIfIndex) if_nametoindex(interface);
705
if(if_index == 0){
706
fprintf(stderr, "No such interface: \"%s\"\n", interface);
707
exit(EXIT_FAILURE);
708
}
709
}
710
711
if(connect_to != NULL){
712
/* Connect directly, do not use Zeroconf */
713
/* (Mainly meant for debugging) */
714
char *address = strrchr(connect_to, ':');
715
if(address == NULL){
716
fprintf(stderr, "No colon in address\n");
717
exit(EXIT_FAILURE);
718
}
719
errno = 0;
720
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
721
if(errno){
722
perror("Bad port number");
723
exit(EXIT_FAILURE);
724
}
725
*address = '\0';
726
address = connect_to;
727
ret = start_mandos_communication(address, port, if_index);
728
if(ret < 0){
729
exit(EXIT_FAILURE);
730
} else {
731
exit(EXIT_SUCCESS);
732
}
733
}
734
735
certkey = combinepath(certdir, certkey);
736
if (certkey == NULL){
737
goto exit;
738
}
739
740
if (not debug){
741
avahi_set_log_function(empty_log);
742
}
743
744
/* Initialize the psuedo-RNG */
745
srand((unsigned int) time(NULL));
746
747
/* Allocate main loop object */
748
if (!(simple_poll = avahi_simple_poll_new())) {
749
fprintf(stderr, "Failed to create simple poll object.\n");
750
751
goto exit;
752
}
753
754
/* Do not publish any local records */
1202
/* Do not publish any local Zeroconf records */
755
1203
avahi_server_config_init(&config);
756
1204
config.publish_hinfo = 0;
757
1205
config.publish_addresses = 0;
758
1206
config.publish_workstation = 0;
759
1207
config.publish_domain = 0;
760
1208
761
1209
/* Allocate a new server */
762
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
763
&config, NULL, NULL, &error);
764
765
/* Free the configuration data */
1210
mc.server = avahi_server_new(avahi_simple_poll_get
1211
(mc.simple_poll), &config, NULL,
1212
NULL, &error);
1213
1214
/* Free the Avahi configuration data */
766
1215
avahi_server_config_free(&config);
767
768
/* Check if creating the server object succeeded */
769
if (!server) {
770
fprintf(stderr, "Failed to create server: %s\n",
771
avahi_strerror(error));
772
returncode = EXIT_FAILURE;
773
goto exit;
774
}
775
776
/* Create the service browser */
777
sb = avahi_s_service_browser_new(server, if_index,
778
AVAHI_PROTO_INET6,
779
"_mandos._tcp", NULL, 0,
780
browse_callback, server);
781
if (!sb) {
782
fprintf(stderr, "Failed to create service browser: %s\n",
783
avahi_strerror(avahi_server_errno(server)));
784
returncode = EXIT_FAILURE;
785
goto exit;
786
}
787
788
/* Run the main loop */
789
790
if (debug){
791
fprintf(stderr, "Starting avahi loop search\n");
792
}
793
794
avahi_simple_poll_loop(simple_poll);
795
796
exit:
797
798
if (debug){
799
fprintf(stderr, "%s exiting\n", argv[0]);
800
}
801
802
/* Cleanup things */
803
if (sb)
804
avahi_s_service_browser_free(sb);
805
806
if (server)
807
avahi_server_free(server);
808
809
if (simple_poll)
810
avahi_simple_poll_free(simple_poll);
811
free(certfile);
812
free(certkey);
813
814
return returncode;
1216
}
1217
1218
/* Check if creating the Avahi server object succeeded */
1219
if(mc.server == NULL){
1220
fprintf(stderr, "Failed to create Avahi server: %s\n",
1221
avahi_strerror(error));
1222
exitcode = EXIT_FAILURE;
1223
goto end;
1224
}
1225
1226
/* Create the Avahi service browser */
1227
sb = avahi_s_service_browser_new(mc.server, if_index,
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1229
NULL, 0, browse_callback, NULL);
1230
if(sb == NULL){
1231
fprintf(stderr, "Failed to create service browser: %s\n",
1232
avahi_strerror(avahi_server_errno(mc.server)));
1233
exitcode = EXIT_FAILURE;
1234
goto end;
1235
}
1236
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1239
if(ret == -1){
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1242
goto end;
1243
}
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1245
if(ret == -1){
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1248
goto end;
1249
}
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1251
if(ret == -1){
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1257
if(ret == -1){
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1262
1263
/* Run the main loop */
1264
1265
if(debug){
1266
fprintf(stderr, "Starting Avahi loop search\n");
1267
}
1268
1269
avahi_simple_poll_loop(mc.simple_poll);
1270
1271
end:
1272
1273
if(debug){
1274
fprintf(stderr, "%s exiting\n", argv[0]);
1275
}
1276
1277
/* Cleanup things */
1278
if(sb != NULL)
1279
avahi_s_service_browser_free(sb);
1280
1281
if(mc.server != NULL)
1282
avahi_server_free(mc.server);
1283
1284
if(mc.simple_poll != NULL)
1285
avahi_simple_poll_free(mc.simple_poll);
1286
1287
if(gnutls_initialized){
1288
gnutls_certificate_free_credentials(mc.cred);
1289
gnutls_global_deinit();
1290
gnutls_dh_params_deinit(mc.dh_params);
1291
}
1292
1293
if(gpgme_initialized){
1294
gpgme_release(mc.ctx);
1295
}
1296
1297
/* Removes the temp directory used by GPGME */
1298
if(tempdir_created){
1299
DIR *d;
1300
struct dirent *direntry;
1301
d = opendir(tempdir);
1302
if(d == NULL){
1303
if(errno != ENOENT){
1304
perror("opendir");
1305
}
1306
} else {
1307
while(true){
1308
direntry = readdir(d);
1309
if(direntry == NULL){
1310
break;
1311
}
1312
/* Skip "." and ".." */
1313
if(direntry->d_name[0] == '.'
1314
and (direntry->d_name[1] == '\0'
1315
or (direntry->d_name[1] == '.'
1316
and direntry->d_name[2] == '\0'))){
1317
continue;
1318
}
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", tempdir,
1321
direntry->d_name);
1322
if(ret < 0){
1323
perror("asprintf");
1324
continue;
1325
}
1326
ret = remove(fullname);
1327
if(ret == -1){
1328
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1329
strerror(errno));
1330
}
1331
free(fullname);
1332
}
1333
closedir(d);
1334
}
1335
ret = rmdir(tempdir);
1336
if(ret == -1 and errno != ENOENT){
1337
perror("rmdir");
1338
}
1339
}
1340
1341
return exitcode;
815
1342
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0