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- Committer: Teddy Hogeborn
- Date: 2009-09-07 07:48:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20090907074859-nv2nni1wwib5hi10
* plugin-runner.c: Minor stylistic changes.
* plugins.d/askpass-fifo.c: Changed contact information and did minor
stylistic changes.
* plugins.d/mandos-client.c: Minor stylistic changes.
* plugins.d/password-prompt.c: Changed contact information.
* plugins.d/splashy.c: Changed contact information.
(main): Changed error handling design. Bug fix: Will now be much
more tolerant against signals. Bug fix: Will now re-raise
signal received.
* plugins.d/usplash.c: Changed contact information and did minor
stylistic changes.
* plugins.d/askpass-fifo.c: Changed contact information and did minor
stylistic changes.
* plugins.d/mandos-client.c: Minor stylistic changes.
* plugins.d/password-prompt.c: Changed contact information.
* plugins.d/splashy.c: Changed contact information.
(main): Changed error handling design. Bug fix: Will now be much
more tolerant against signals. Bug fix: Will now re-raise
signal received.
* plugins.d/usplash.c: Changed contact information and did minor
stylistic changes.
- 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
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
42
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
90
/* Avahi */
91
/* All Avahi types, constants and functions
92
Avahi*, avahi_*,
93
AVAHI_* */
43
94
#include <avahi-core/core.h>
44
95
#include <avahi-core/lookup.h>
45
96
#include <avahi-core/log.h>
47
98
#include <avahi-common/malloc.h>
48
99
#include <avahi-common/error.h>
49
100
50
//mandos client part
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
56
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
63
64
// gpgme
65
#include <errno.h> /* perror() */
66
#include <gpgme.h>
67
68
// getopt long
69
#include <getopt.h>
101
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
104
gnutls_*
105
init_gnutls_session(),
106
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
110
111
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
114
gpgme_*
115
GPGME_PROTOCOL_OpenPGP,
116
GPG_ERR_NO_* */
70
117
71
118
#define BUFFER_SIZE 256
72
#define DH_BITS 1024
73
119
74
static const char *certdir = "/conf/conf.d/mandos";
75
static const char *certfile = "openpgp-client.txt";
76
static const char *certkey = "openpgp-client-key.txt";
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
77
123
78
124
bool debug = false;
125
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
128
129
/* Used for passing in values through the Avahi callback functions */
80
130
typedef struct {
81
gnutls_session_t session;
131
AvahiSimplePoll *simple_poll;
132
AvahiServer *server;
82
133
gnutls_certificate_credentials_t cred;
134
unsigned int dh_bits;
83
135
gnutls_dh_params_t dh_params;
84
} encrypted_session;
85
86
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet,
89
const char *homedir){
90
gpgme_data_t dh_crypto, dh_plain;
136
const char *priority;
91
137
gpgme_ctx_t ctx;
138
} mandos_context;
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
148
* "buffer_length" is how much is already used.
149
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
155
return 0;
156
}
157
buffer_capacity += BUFFER_SIZE;
158
}
159
return buffer_capacity;
160
}
161
162
/*
163
* Initialize GPGME.
164
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
92
167
gpgme_error_t rc;
93
ssize_t ret;
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
96
168
gpgme_engine_info_t engine_info;
97
98
if (debug){
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
169
170
171
/*
172
* Helper function to insert pub and seckey to the engine keyring.
173
*/
174
bool import_key(const char *filename){
175
int ret;
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");
100
209
}
101
210
102
211
/* Init GPGME */
103
212
gpgme_check_version(NULL);
104
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
105
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
106
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
107
216
gpgme_strsource(rc), gpgme_strerror(rc));
108
return -1;
217
return false;
109
218
}
110
219
111
/* Set GPGME home directory */
112
rc = gpgme_get_engine_info (&engine_info);
113
if (rc != GPG_ERR_NO_ERROR){
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
114
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
115
224
gpgme_strsource(rc), gpgme_strerror(rc));
116
return -1;
225
return false;
117
226
}
118
227
while(engine_info != NULL){
119
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
120
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
121
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
122
231
break;
123
232
}
124
233
engine_info = engine_info->next;
125
234
}
126
235
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
return -1;
129
}
130
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
133
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
270
}
271
272
/* Create new GPGME data buffer from memory cryptotext */
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
0);
275
if(rc != GPG_ERR_NO_ERROR){
134
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
277
gpgme_strsource(rc), gpgme_strerror(rc));
136
278
return -1;
138
280
139
281
/* Create new empty GPGME data buffer for the plaintext */
140
282
rc = gpgme_data_new(&dh_plain);
141
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
142
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
143
285
gpgme_strsource(rc), gpgme_strerror(rc));
144
return -1;
145
}
146
147
/* Create new GPGME "context" */
148
rc = gpgme_new(&ctx);
149
if (rc != GPG_ERR_NO_ERROR){
150
fprintf(stderr, "bad gpgme_new: %s: %s\n",
151
gpgme_strsource(rc), gpgme_strerror(rc));
152
return -1;
153
}
154
155
/* Decrypt data from the FILE pointer to the plaintext data
156
buffer */
157
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
158
if (rc != GPG_ERR_NO_ERROR){
286
gpgme_data_release(dh_crypto);
287
return -1;
288
}
289
290
/* Decrypt data from the cryptotext data buffer to the plaintext
291
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
159
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
160
295
gpgme_strsource(rc), gpgme_strerror(rc));
161
return -1;
162
}
163
164
if(debug){
165
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
}
167
168
if (debug){
169
gpgme_decrypt_result_t result;
170
result = gpgme_op_decrypt_result(ctx);
171
if (result == NULL){
172
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
173
} else {
174
fprintf(stderr, "Unsupported algorithm: %s\n",
175
result->unsupported_algorithm);
176
fprintf(stderr, "Wrong key usage: %d\n",
177
result->wrong_key_usage);
178
if(result->file_name != NULL){
179
fprintf(stderr, "File name: %s\n", result->file_name);
180
}
181
gpgme_recipient_t recipient;
182
recipient = result->recipients;
183
if(recipient){
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;
184
312
while(recipient != NULL){
185
313
fprintf(stderr, "Public key algorithm: %s\n",
186
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
192
320
}
193
321
}
194
322
}
323
goto decrypt_end;
195
324
}
196
325
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
}
199
329
200
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
perror("pgpme_data_seek");
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;
203
335
}
204
336
205
*new_packet = 0;
337
*plaintext = NULL;
206
338
while(true){
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
210
+ BUFFER_SIZE);
211
if (*new_packet == NULL){
212
perror("realloc");
213
return -1;
214
}
215
new_packet_capacity += BUFFER_SIZE;
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;
216
346
}
217
347
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
349
BUFFER_SIZE);
220
350
/* Print the data, if any */
221
if (ret == 0){
351
if(ret == 0){
352
/* EOF */
222
353
break;
223
354
}
224
355
if(ret < 0){
225
356
perror("gpgme_data_read");
226
return -1;
227
}
228
new_packet_length += ret;
229
}
230
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
233
/* if(debug){ */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
237
/* } */
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);
238
375
239
376
/* Delete the GPGME plaintext data buffer */
240
377
gpgme_data_release(dh_plain);
241
return new_packet_length;
378
return plaintext_length;
242
379
}
243
380
244
static const char * safer_gnutls_strerror (int value) {
245
const char *ret = gnutls_strerror (value);
246
if (ret == NULL)
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)
247
385
ret = "(unknown)";
248
386
return ret;
249
387
}
250
388
389
/* GnuTLS log function callback */
251
390
static void debuggnutls(__attribute__((unused)) int level,
252
391
const char* string){
253
fprintf(stderr, "%s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
254
393
}
255
394
256
static int initgnutls(encrypted_session *es){
257
const char *err;
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
258
397
int ret;
259
398
260
399
if(debug){
261
400
fprintf(stderr, "Initializing GnuTLS\n");
262
401
}
263
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
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));
267
407
return -1;
268
408
}
269
270
if (debug){
409
410
if(debug){
411
/* "Use a log level over 10 to enable all debugging options."
412
* - GnuTLS manual
413
*/
271
414
gnutls_global_set_log_level(11);
272
415
gnutls_global_set_log_function(debuggnutls);
273
416
}
274
417
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
279
safer_gnutls_strerror(ret));
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();
280
427
return -1;
281
428
}
282
429
283
430
if(debug){
284
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", certfile,
286
certkey);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
287
434
}
288
435
289
436
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
291
if (ret != GNUTLS_E_SUCCESS) {
292
fprintf
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
" '%s')\n",
295
ret, certfile, certkey);
296
fprintf(stdout, "The Error is: %s\n",
297
safer_gnutls_strerror(ret));
298
return -1;
299
}
300
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
306
return -1;
307
}
308
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
313
return -1;
314
}
315
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
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){
321
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
480
safer_gnutls_strerror(ret));
323
481
}
324
482
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
330
return -1;
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
}
331
493
}
332
494
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
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",
337
499
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
338
501
return -1;
339
502
}
340
503
341
504
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
343
GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
344
507
345
gnutls_dh_set_prime_bits (es->session, DH_BITS);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
346
509
347
510
return 0;
348
511
}
349
512
513
/* Avahi log function callback */
350
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
515
__attribute__((unused)) const char *txt){}
352
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
/* Called when a Mandos server is found */
353
521
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
355
int ret, tcp_sd;
356
struct sockaddr_in6 to;
357
encrypted_session es;
522
AvahiIfIndex if_index,
523
int af){
524
int ret, tcp_sd = -1;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
358
530
char *buffer = NULL;
359
531
char *decrypted_buffer;
360
532
size_t buffer_length = 0;
361
533
size_t buffer_capacity = 0;
362
ssize_t decrypted_buffer_size;
363
size_t written = 0;
534
size_t written;
364
535
int retval = 0;
365
char interface[IF_NAMESIZE];
536
gnutls_session_t session;
537
int pf; /* Protocol family */
538
539
if(quit_now){
540
return -1;
541
}
542
543
switch(af){
544
case AF_INET6:
545
pf = PF_INET6;
546
break;
547
case AF_INET:
548
pf = PF_INET;
549
break;
550
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
552
return -1;
553
}
554
555
ret = init_gnutls_session(&session);
556
if(ret != 0){
557
return -1;
558
}
366
559
367
560
if(debug){
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
369
ip, port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
370
563
}
371
564
372
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
373
if(tcp_sd < 0) {
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
if(tcp_sd < 0){
374
567
perror("socket");
375
return -1;
376
}
377
378
if(debug){
379
if(if_indextoname((unsigned int)if_index, interface) == NULL){
380
if(debug){
381
perror("if_indextoname");
382
}
383
return -1;
384
}
385
386
fprintf(stderr, "Binding to interface %s\n", interface);
387
}
388
389
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
392
if (ret < 0 ){
568
retval = -1;
569
goto mandos_end;
570
}
571
572
if(quit_now){
573
goto mandos_end;
574
}
575
576
memset(&to, 0, sizeof(to));
577
if(af == AF_INET6){
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
580
} else { /* IPv4 */
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
583
}
584
if(ret < 0 ){
393
585
perror("inet_pton");
394
return -1;
395
}
586
retval = -1;
587
goto mandos_end;
588
}
396
589
if(ret == 0){
397
590
fprintf(stderr, "Bad address: %s\n", ip);
398
return -1;
399
}
400
to.sin6_port = htons(port); /* Spurious warning */
591
retval = -1;
592
goto mandos_end;
593
}
594
if(af == AF_INET6){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
602
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
606
goto mandos_end;
607
}
608
/* Set the network interface number as scope */
609
to.in6.sin6_scope_id = (uint32_t)if_index;
610
}
611
} else {
612
to.in.sin_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
615
}
401
616
402
to.sin6_scope_id = (uint32_t)if_index;
617
if(quit_now){
618
goto mandos_end;
619
}
403
620
404
621
if(debug){
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
/* char addrstr[INET6_ADDRSTRLEN]; */
407
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
408
/* sizeof(addrstr)) == NULL){ */
409
/* perror("inet_ntop"); */
410
/* } else { */
411
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
412
/* addrstr, ntohs(to.sin6_port)); */
413
/* } */
414
}
415
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
417
if (ret < 0){
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
char interface[IF_NAMESIZE];
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
626
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
629
}
630
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
633
}
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
if(pcret == NULL){
645
perror("inet_ntop");
646
} else {
647
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
649
}
650
}
651
}
652
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
662
if(ret < 0){
418
663
perror("connect");
419
return -1;
420
}
421
422
ret = initgnutls (&es);
423
if (ret != 0){
424
664
retval = -1;
425
return -1;
426
}
427
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
670
}
671
672
const char *out = mandos_protocol_version;
673
written = 0;
674
while(true){
675
size_t out_size = strlen(out);
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
677
out_size - written));
678
if(ret == -1){
679
perror("write");
680
retval = -1;
681
goto mandos_end;
682
}
683
written += (size_t)ret;
684
if(written < out_size){
685
continue;
686
} else {
687
if(out == mandos_protocol_version){
688
written = 0;
689
out = "\r\n";
690
} else {
691
break;
692
}
693
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
698
}
430
699
431
700
if(debug){
432
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
702
}
434
703
435
ret = gnutls_handshake (es.session);
436
437
if (ret != GNUTLS_E_SUCCESS){
704
if(quit_now){
705
goto mandos_end;
706
}
707
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
715
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
721
if(ret != GNUTLS_E_SUCCESS){
438
722
if(debug){
439
fprintf(stderr, "\n*** Handshake failed ***\n");
440
gnutls_perror (ret);
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
724
gnutls_perror(ret);
441
725
}
442
726
retval = -1;
443
goto exit;
727
goto mandos_end;
444
728
}
445
729
446
//Retrieve OpenPGP packet that contains the wanted password
730
/* Read OpenPGP packet that contains the wanted password */
447
731
448
732
if(debug){
449
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
450
734
ip);
451
735
}
452
736
453
737
while(true){
454
if (buffer_length + BUFFER_SIZE > buffer_capacity){
455
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
456
if (buffer == NULL){
457
perror("realloc");
458
goto exit;
459
}
460
buffer_capacity += BUFFER_SIZE;
461
}
462
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
465
if (ret == 0){
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
744
buffer_capacity);
745
if(buffer_capacity == 0){
746
perror("incbuffer");
747
retval = -1;
748
goto mandos_end;
749
}
750
751
if(quit_now){
752
goto mandos_end;
753
}
754
755
sret = gnutls_record_recv(session, buffer+buffer_length,
756
BUFFER_SIZE);
757
if(sret == 0){
466
758
break;
467
759
}
468
if (ret < 0){
469
switch(ret){
760
if(sret < 0){
761
switch(sret){
470
762
case GNUTLS_E_INTERRUPTED:
471
763
case GNUTLS_E_AGAIN:
472
764
break;
473
765
case GNUTLS_E_REHANDSHAKE:
474
ret = gnutls_handshake (es.session);
475
if (ret < 0){
476
fprintf(stderr, "\n*** Handshake failed ***\n");
477
gnutls_perror (ret);
766
do {
767
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
773
if(ret < 0){
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
775
gnutls_perror(ret);
478
776
retval = -1;
479
goto exit;
777
goto mandos_end;
480
778
}
481
779
break;
482
780
default:
483
781
fprintf(stderr, "Unknown error while reading data from"
484
" encrypted session with mandos server\n");
782
" encrypted session with Mandos server\n");
485
783
retval = -1;
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
487
goto exit;
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
785
goto mandos_end;
488
786
}
489
787
} else {
490
buffer_length += (size_t) ret;
788
buffer_length += (size_t) sret;
491
789
}
492
790
}
493
791
494
if (buffer_length > 0){
792
if(debug){
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
if(buffer_length > 0){
807
ssize_t decrypted_buffer_size;
495
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
496
809
buffer_length,
497
&decrypted_buffer,
498
certdir);
499
if (decrypted_buffer_size >= 0){
810
&decrypted_buffer);
811
if(decrypted_buffer_size >= 0){
812
813
written = 0;
500
814
while(written < (size_t) decrypted_buffer_size){
501
ret = (int)fwrite (decrypted_buffer + written, 1,
502
(size_t)decrypted_buffer_size - written,
503
stdout);
815
if(quit_now){
816
goto mandos_end;
817
}
818
819
ret = (int)fwrite(decrypted_buffer + written, 1,
820
(size_t)decrypted_buffer_size - written,
821
stdout);
504
822
if(ret == 0 and ferror(stdout)){
505
823
if(debug){
506
824
fprintf(stderr, "Error writing encrypted data: %s\n",
515
833
} else {
516
834
retval = -1;
517
835
}
518
}
519
520
//shutdown procedure
521
522
if(debug){
523
fprintf(stderr, "Closing TLS session\n");
524
}
525
836
} else {
837
retval = -1;
838
}
839
840
/* Shutdown procedure */
841
842
mandos_end:
526
843
free(buffer);
527
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
exit:
529
close(tcp_sd);
530
gnutls_deinit (es.session);
531
gnutls_certificate_free_credentials (es.cred);
532
gnutls_global_deinit ();
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
533
854
return retval;
534
855
}
535
856
536
static AvahiSimplePoll *simple_poll = NULL;
537
static AvahiServer *server = NULL;
538
539
static void resolve_callback(
540
AvahiSServiceResolver *r,
541
AvahiIfIndex interface,
542
AVAHI_GCC_UNUSED AvahiProtocol protocol,
543
AvahiResolverEvent event,
544
const char *name,
545
const char *type,
546
const char *domain,
547
const char *host_name,
548
const AvahiAddress *address,
549
uint16_t port,
550
AVAHI_GCC_UNUSED AvahiStringList *txt,
551
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
552
AVAHI_GCC_UNUSED void* userdata) {
553
554
assert(r); /* Spurious warning */
857
static void resolve_callback(AvahiSServiceResolver *r,
858
AvahiIfIndex interface,
859
AvahiProtocol proto,
860
AvahiResolverEvent event,
861
const char *name,
862
const char *type,
863
const char *domain,
864
const char *host_name,
865
const AvahiAddress *address,
866
uint16_t port,
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
869
flags,
870
AVAHI_GCC_UNUSED void* userdata){
871
assert(r);
555
872
556
873
/* Called whenever a service has been resolved successfully or
557
874
timed out */
558
875
559
switch (event) {
876
if(quit_now){
877
return;
878
}
879
880
switch(event){
560
881
default:
561
882
case AVAHI_RESOLVER_FAILURE:
562
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
563
" type '%s' in domain '%s': %s\n", name, type, domain,
564
avahi_strerror(avahi_server_errno(server)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
565
886
break;
566
887
567
888
case AVAHI_RESOLVER_FOUND:
569
890
char ip[AVAHI_ADDRESS_STR_MAX];
570
891
avahi_address_snprint(ip, sizeof(ip), address);
571
892
if(debug){
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" port %d\n", name, host_name, ip, port);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
574
896
}
575
int ret = start_mandos_communication(ip, port, interface);
576
if (ret == 0){
577
exit(EXIT_SUCCESS);
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
899
if(ret == 0){
900
avahi_simple_poll_quit(mc.simple_poll);
578
901
}
579
902
}
580
903
}
581
904
avahi_s_service_resolver_free(r);
582
905
}
583
906
584
static void browse_callback(
585
AvahiSServiceBrowser *b,
586
AvahiIfIndex interface,
587
AvahiProtocol protocol,
588
AvahiBrowserEvent event,
589
const char *name,
590
const char *type,
591
const char *domain,
592
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
593
void* userdata) {
594
595
AvahiServer *s = userdata;
596
assert(b); /* Spurious warning */
597
598
/* Called whenever a new services becomes available on the LAN or
599
is removed from the LAN */
600
601
switch (event) {
602
default:
603
case AVAHI_BROWSER_FAILURE:
604
605
fprintf(stderr, "(Browser) %s\n",
606
avahi_strerror(avahi_server_errno(server)));
607
avahi_simple_poll_quit(simple_poll);
608
return;
609
610
case AVAHI_BROWSER_NEW:
611
/* We ignore the returned resolver object. In the callback
612
function we free it. If the server is terminated before
613
the callback function is called the server will free
614
the resolver for us. */
615
616
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
617
type, domain,
618
AVAHI_PROTO_INET6, 0,
619
resolve_callback, s)))
620
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
621
avahi_strerror(avahi_server_errno(s)));
622
break;
623
624
case AVAHI_BROWSER_REMOVE:
625
break;
626
627
case AVAHI_BROWSER_ALL_FOR_NOW:
628
case AVAHI_BROWSER_CACHE_EXHAUSTED:
629
break;
907
static void browse_callback(AvahiSServiceBrowser *b,
908
AvahiIfIndex interface,
909
AvahiProtocol protocol,
910
AvahiBrowserEvent event,
911
const char *name,
912
const char *type,
913
const char *domain,
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
915
flags,
916
AVAHI_GCC_UNUSED void* userdata){
917
assert(b);
918
919
/* Called whenever a new services becomes available on the LAN or
920
is removed from the LAN */
921
922
if(quit_now){
923
return;
924
}
925
926
switch(event){
927
default:
928
case AVAHI_BROWSER_FAILURE:
929
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
933
return;
934
935
case AVAHI_BROWSER_NEW:
936
/* We ignore the returned Avahi resolver object. In the callback
937
function we free it. If the Avahi server is terminated before
938
the callback function is called the Avahi server will free the
939
resolver for us. */
940
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
946
break;
947
948
case AVAHI_BROWSER_REMOVE:
949
break;
950
951
case AVAHI_BROWSER_ALL_FOR_NOW:
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
953
if(debug){
954
fprintf(stderr, "No Mandos server found, still searching...\n");
630
955
}
631
}
632
633
/* Combines file name and path and returns the malloced new
634
string. some sane checks could/should be added */
635
static const char *combinepath(const char *first, const char *second){
636
size_t f_len = strlen(first);
637
size_t s_len = strlen(second);
638
char *tmp = malloc(f_len + s_len + 2);
639
if (tmp == NULL){
640
return NULL;
641
}
642
if(f_len > 0){
643
memcpy(tmp, first, f_len);
644
}
645
tmp[f_len] = '/';
646
if(s_len > 0){
647
memcpy(tmp + f_len + 1, second, s_len);
648
}
649
tmp[f_len + 1 + s_len] = '\0';
650
return tmp;
651
}
652
653
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
656
AvahiSServiceBrowser *sb = NULL;
657
int error;
658
int ret;
659
int returncode = EXIT_SUCCESS;
660
const char *interface = "eth0";
661
struct ifreq network;
662
int sd;
663
char *connect_to = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
956
break;
957
}
958
}
959
960
/* stop main loop after sigterm has been called */
961
static void handle_sigterm(int sig){
962
if(quit_now){
963
return;
964
}
965
quit_now = 1;
966
signal_received = sig;
967
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
972
}
973
974
int main(int argc, char *argv[]){
975
AvahiSServiceBrowser *sb = NULL;
976
int error;
977
int ret;
978
intmax_t tmpmax;
979
char *tmp;
980
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
991
const char *seckey = PATHDIR "/" SECKEY;
992
const char *pubkey = PATHDIR "/" PUBKEY;
993
994
bool gnutls_initialized = false;
995
bool gpgme_initialized = false;
996
float delay = 2.5f;
997
998
struct sigaction old_sigterm_action;
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
1001
{
1002
struct argp_option options[] = {
1003
{ .name = "debug", .key = 128,
1004
.doc = "Debug mode", .group = 3 },
1005
{ .name = "connect", .key = 'c',
1006
.arg = "ADDRESS:PORT",
1007
.doc = "Connect directly to a specific Mandos server",
1008
.group = 1 },
1009
{ .name = "interface", .key = 'i',
1010
.arg = "NAME",
1011
.doc = "Network interface that will be used to search for"
1012
" Mandos servers",
1013
.group = 1 },
1014
{ .name = "seckey", .key = 's',
1015
.arg = "FILE",
1016
.doc = "OpenPGP secret key file base name",
1017
.group = 1 },
1018
{ .name = "pubkey", .key = 'p',
1019
.arg = "FILE",
1020
.doc = "OpenPGP public key file base name",
1021
.group = 2 },
1022
{ .name = "dh-bits", .key = 129,
1023
.arg = "BITS",
1024
.doc = "Bit length of the prime number used in the"
1025
" Diffie-Hellman key exchange",
1026
.group = 2 },
1027
{ .name = "priority", .key = 130,
1028
.arg = "STRING",
1029
.doc = "GnuTLS priority string for the TLS handshake",
1030
.group = 1 },
1031
{ .name = "delay", .key = 131,
1032
.arg = "SECONDS",
1033
.doc = "Maximum delay to wait for interface startup",
1034
.group = 2 },
1035
{ .name = NULL }
1036
};
665
1037
666
while (true){
667
static struct option long_options[] = {
668
{"debug", no_argument, (int *)&debug, 1},
669
{"connect", required_argument, 0, 'C'},
670
{"interface", required_argument, 0, 'i'},
671
{"certdir", required_argument, 0, 'd'},
672
{"certkey", required_argument, 0, 'c'},
673
{"certfile", required_argument, 0, 'k'},
674
{0, 0, 0, 0} };
675
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
678
&option_index);
679
680
if (ret == -1){
681
break;
682
}
683
684
switch(ret){
685
case 0:
686
break;
687
case 'i':
688
interface = optarg;
689
break;
690
case 'C':
691
connect_to = optarg;
692
break;
693
case 'd':
694
certdir = optarg;
695
break;
696
case 'c':
697
certfile = optarg;
698
break;
699
case 'k':
700
certkey = optarg;
1038
error_t parse_opt(int key, char *arg,
1039
struct argp_state *state){
1040
switch(key){
1041
case 128: /* --debug */
1042
debug = true;
1043
break;
1044
case 'c': /* --connect */
1045
connect_to = arg;
1046
break;
1047
case 'i': /* --interface */
1048
interface = arg;
1049
break;
1050
case 's': /* --seckey */
1051
seckey = arg;
1052
break;
1053
case 'p': /* --pubkey */
1054
pubkey = arg;
1055
break;
1056
case 129: /* --dh-bits */
1057
errno = 0;
1058
tmpmax = strtoimax(arg, &tmp, 10);
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1063
}
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
break;
1066
case 130: /* --priority */
1067
mc.priority = arg;
1068
break;
1069
case 131: /* --delay */
1070
errno = 0;
1071
delay = strtof(arg, &tmp);
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
701
1080
break;
702
1081
default:
703
exit(EXIT_FAILURE);
1082
return ARGP_ERR_UNKNOWN;
704
1083
}
705
}
706
707
certfile = combinepath(certdir, certfile);
708
if (certfile == NULL){
709
perror("combinepath");
710
returncode = EXIT_FAILURE;
711
goto exit;
712
}
713
714
certkey = combinepath(certdir, certkey);
715
if (certkey == NULL){
716
perror("combinepath");
717
returncode = EXIT_FAILURE;
718
goto exit;
719
}
720
1084
return 0;
1085
}
1086
1087
struct argp argp = { .options = options, .parser = parse_opt,
1088
.args_doc = "",
1089
.doc = "Mandos client -- Get and decrypt"
1090
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
1097
}
1098
1099
if(not debug){
1100
avahi_set_log_function(empty_log);
1101
}
1102
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
from the signal handler */
1105
/* Initialize the pseudo-RNG for Avahi */
1106
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
}
1113
1114
sigemptyset(&sigterm_action.sa_mask);
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1131
goto end;
1132
}
1133
/* Need to check if the handler is SIG_IGN before handling:
1134
| [[info:libc:Initial Signal Actions]] |
1135
| [[info:libc:Basic Signal Handling]] |
1136
*/
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1141
}
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1154
}
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1160
goto end;
1161
}
1162
}
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
721
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
722
1180
if(if_index == 0){
723
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
724
exit(EXIT_FAILURE);
725
}
726
727
if(connect_to != NULL){
728
/* Connect directly, do not use Zeroconf */
729
/* (Mainly meant for debugging) */
730
char *address = strrchr(connect_to, ':');
731
if(address == NULL){
732
fprintf(stderr, "No colon in address\n");
733
exit(EXIT_FAILURE);
734
}
735
errno = 0;
736
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
737
if(errno){
738
perror("Bad port number");
739
exit(EXIT_FAILURE);
740
}
741
*address = '\0';
742
address = connect_to;
743
ret = start_mandos_communication(address, port, if_index);
744
if(ret < 0){
745
exit(EXIT_FAILURE);
746
} else {
747
exit(EXIT_SUCCESS);
748
}
749
}
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
750
1200
751
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
752
if(sd < 0) {
1202
if(sd < 0){
753
1203
perror("socket");
754
returncode = EXIT_FAILURE;
755
goto exit;
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
756
1214
}
757
strcpy(network.ifr_name, interface);
1215
strcpy(network.ifr_name, interface);
758
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
759
1217
if(ret == -1){
760
761
1218
perror("ioctl SIOCGIFFLAGS");
762
returncode = EXIT_FAILURE;
763
goto exit;
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
764
1229
}
765
1230
if((network.ifr_flags & IFF_UP) == 0){
766
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
767
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
768
1234
if(ret == -1){
1235
take_down_interface = false;
769
1236
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
771
goto exit;
772
}
773
}
774
close(sd);
775
776
if (not debug){
777
avahi_set_log_function(empty_log);
778
}
779
780
/* Initialize the psuedo-RNG */
781
srand((unsigned int) time(NULL));
782
783
/* Allocate main loop object */
784
if (!(simple_poll = avahi_simple_poll_new())) {
785
fprintf(stderr, "Failed to create simple poll object.\n");
786
returncode = EXIT_FAILURE;
787
goto exit;
788
}
789
790
/* Do not publish any local records */
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
break;
1256
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
errno = 0;
1289
setgid(gid);
1290
if(ret == -1){
1291
perror("setgid");
1292
}
1293
1294
ret = setuid(uid);
1295
if(ret == -1){
1296
perror("setuid");
1297
}
1298
1299
if(quit_now){
1300
goto end;
1301
}
1302
1303
ret = init_gnutls_global(pubkey, seckey);
1304
if(ret == -1){
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
1307
goto end;
1308
} else {
1309
gnutls_initialized = true;
1310
}
1311
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
tempdir_created = true;
1317
if(mkdtemp(tempdir) == NULL){
1318
tempdir_created = false;
1319
perror("mkdtemp");
1320
goto end;
1321
}
1322
1323
if(quit_now){
1324
goto end;
1325
}
1326
1327
if(not init_gpgme(pubkey, seckey, tempdir)){
1328
fprintf(stderr, "init_gpgme failed\n");
1329
exitcode = EXIT_FAILURE;
1330
goto end;
1331
} else {
1332
gpgme_initialized = true;
1333
}
1334
1335
if(quit_now){
1336
goto end;
1337
}
1338
1339
if(connect_to != NULL){
1340
/* Connect directly, do not use Zeroconf */
1341
/* (Mainly meant for debugging) */
1342
char *address = strrchr(connect_to, ':');
1343
if(address == NULL){
1344
fprintf(stderr, "No colon in address\n");
1345
exitcode = EXIT_FAILURE;
1346
goto end;
1347
}
1348
1349
if(quit_now){
1350
goto end;
1351
}
1352
1353
uint16_t port;
1354
errno = 0;
1355
tmpmax = strtoimax(address+1, &tmp, 10);
1356
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1357
or tmpmax != (uint16_t)tmpmax){
1358
fprintf(stderr, "Bad port number\n");
1359
exitcode = EXIT_FAILURE;
1360
goto end;
1361
}
1362
1363
if(quit_now){
1364
goto end;
1365
}
1366
1367
port = (uint16_t)tmpmax;
1368
*address = '\0';
1369
address = connect_to;
1370
/* Colon in address indicates IPv6 */
1371
int af;
1372
if(strchr(address, ':') != NULL){
1373
af = AF_INET6;
1374
} else {
1375
af = AF_INET;
1376
}
1377
1378
if(quit_now){
1379
goto end;
1380
}
1381
1382
ret = start_mandos_communication(address, port, if_index, af);
1383
if(ret < 0){
1384
exitcode = EXIT_FAILURE;
1385
} else {
1386
exitcode = EXIT_SUCCESS;
1387
}
1388
goto end;
1389
}
1390
1391
if(quit_now){
1392
goto end;
1393
}
1394
1395
{
1396
AvahiServerConfig config;
1397
/* Do not publish any local Zeroconf records */
791
1398
avahi_server_config_init(&config);
792
1399
config.publish_hinfo = 0;
793
1400
config.publish_addresses = 0;
794
1401
config.publish_workstation = 0;
795
1402
config.publish_domain = 0;
796
1403
797
1404
/* Allocate a new server */
798
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
799
&config, NULL, NULL, &error);
800
801
/* Free the configuration data */
1405
mc.server = avahi_server_new(avahi_simple_poll_get
1406
(mc.simple_poll), &config, NULL,
1407
NULL, &error);
1408
1409
/* Free the Avahi configuration data */
802
1410
avahi_server_config_free(&config);
803
804
/* Check if creating the server object succeeded */
805
if (!server) {
806
fprintf(stderr, "Failed to create server: %s\n",
807
avahi_strerror(error));
808
returncode = EXIT_FAILURE;
809
goto exit;
810
}
811
812
/* Create the service browser */
813
sb = avahi_s_service_browser_new(server, if_index,
814
AVAHI_PROTO_INET6,
815
"_mandos._tcp", NULL, 0,
816
browse_callback, server);
817
if (!sb) {
818
fprintf(stderr, "Failed to create service browser: %s\n",
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
821
goto exit;
822
}
823
824
/* Run the main loop */
825
826
if (debug){
827
fprintf(stderr, "Starting avahi loop search\n");
828
}
829
830
avahi_simple_poll_loop(simple_poll);
831
832
exit:
833
834
if (debug){
835
fprintf(stderr, "%s exiting\n", argv[0]);
836
}
837
838
/* Cleanup things */
839
if (sb)
840
avahi_s_service_browser_free(sb);
841
842
if (server)
843
avahi_server_free(server);
844
845
if (simple_poll)
846
avahi_simple_poll_free(simple_poll);
847
free(certfile);
848
free(certkey);
849
850
return returncode;
1411
}
1412
1413
/* Check if creating the Avahi server object succeeded */
1414
if(mc.server == NULL){
1415
fprintf(stderr, "Failed to create Avahi server: %s\n",
1416
avahi_strerror(error));
1417
exitcode = EXIT_FAILURE;
1418
goto end;
1419
}
1420
1421
if(quit_now){
1422
goto end;
1423
}
1424
1425
/* Create the Avahi service browser */
1426
sb = avahi_s_service_browser_new(mc.server, if_index,
1427
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1428
NULL, 0, browse_callback, NULL);
1429
if(sb == NULL){
1430
fprintf(stderr, "Failed to create service browser: %s\n",
1431
avahi_strerror(avahi_server_errno(mc.server)));
1432
exitcode = EXIT_FAILURE;
1433
goto end;
1434
}
1435
1436
if(quit_now){
1437
goto end;
1438
}
1439
1440
/* Run the main loop */
1441
1442
if(debug){
1443
fprintf(stderr, "Starting Avahi loop search\n");
1444
}
1445
1446
avahi_simple_poll_loop(mc.simple_poll);
1447
1448
end:
1449
1450
if(debug){
1451
fprintf(stderr, "%s exiting\n", argv[0]);
1452
}
1453
1454
/* Cleanup things */
1455
if(sb != NULL)
1456
avahi_s_service_browser_free(sb);
1457
1458
if(mc.server != NULL)
1459
avahi_server_free(mc.server);
1460
1461
if(mc.simple_poll != NULL)
1462
avahi_simple_poll_free(mc.simple_poll);
1463
1464
if(gnutls_initialized){
1465
gnutls_certificate_free_credentials(mc.cred);
1466
gnutls_global_deinit();
1467
gnutls_dh_params_deinit(mc.dh_params);
1468
}
1469
1470
if(gpgme_initialized){
1471
gpgme_release(mc.ctx);
1472
}
1473
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1477
if(ret == -1){
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1482
if(ret == -1){
1483
perror("ioctl SIOCSIFFLAGS");
1484
}
1485
}
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1487
if(ret == -1){
1488
perror("close");
1489
}
1490
}
1491
1492
/* Removes the temp directory used by GPGME */
1493
if(tempdir_created){
1494
DIR *d;
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1497
if(d == NULL){
1498
if(errno != ENOENT){
1499
perror("opendir");
1500
}
1501
} else {
1502
while(true){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1505
break;
1506
}
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1512
continue;
1513
}
1514
char *fullname = NULL;
1515
ret = asprintf(&fullname, "%s/%s", tempdir,
1516
direntry->d_name);
1517
if(ret < 0){
1518
perror("asprintf");
1519
continue;
1520
}
1521
ret = remove(fullname);
1522
if(ret == -1){
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1524
strerror(errno));
1525
}
1526
free(fullname);
1527
}
1528
closedir(d);
1529
}
1530
ret = rmdir(tempdir);
1531
if(ret == -1 and errno != ENOENT){
1532
perror("rmdir");
1533
}
1534
}
1535
1536
if(quit_now){
1537
sigemptyset(&old_sigterm_action.sa_mask);
1538
old_sigterm_action.sa_handler = SIG_DFL;
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1540
if(ret == -1){
1541
perror("sigaction");
1542
}
1543
raise(signal_received);
1544
}
1545
1546
return exitcode;
851
1547
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0