To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 269.1.2
- compare with another revision
- download diff
- download tarball
- view history from revision 269.1.2
- Committer: teddy at bsnet
- Date: 2010-08-11 20:06:18 UTC
- mto: (237.2.182 mandos-local)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100811200618-1uuv7p6cmrb2cmxu
* plugins.d/mandos-client.c: Added debug output.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
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() */
57
64
#include <assert.h> /* assert() */
58
65
#include <errno.h> /* perror(), errno */
59
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
60
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
61
68
SIOCSIFFLAGS, if_indextoname(),
62
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
63
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
64
getuid(), getgid(), setuid(),
65
setgid() */
66
#include <netinet/in.h>
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
67
76
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
69
78
#include <argp.h> /* struct argp_option, error_t, struct
70
79
argp_state, struct argp,
71
80
argp_parse(), ARGP_KEY_ARG,
72
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__ */
73
89
74
90
/* Avahi */
75
91
/* All Avahi types, constants and functions
83
99
#include <avahi-common/error.h>
84
100
85
101
/* GnuTLS */
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
87
104
gnutls_*
88
105
init_gnutls_session(),
89
106
GNUTLS_* */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
91
109
GNUTLS_OPENPGP_FMT_BASE64 */
92
110
93
111
/* GPGME */
94
#include <gpgme.h> /* All GPGME types, constants and functions
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
95
114
gpgme_*
96
115
GPGME_PROTOCOL_OpenPGP,
97
116
GPG_ERR_NO_* */
98
117
99
118
#define BUFFER_SIZE 256
100
119
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
101
124
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
125
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
126
const char *argp_program_version = "mandos-client " VERSION;
105
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
static const char sys_class_net[] = "/sys/class/net";
129
char *connect_to = NULL;
106
130
107
131
/* Used for passing in values through the Avahi callback functions */
108
132
typedef struct {
112
136
unsigned int dh_bits;
113
137
gnutls_dh_params_t dh_params;
114
138
const char *priority;
139
gpgme_ctx_t ctx;
115
140
} mandos_context;
116
141
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
117
150
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
120
153
* "buffer_length" is how much is already used.
121
154
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t incbuffer(char **buffer, size_t buffer_length,
123
156
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
159
if(buffer == NULL){
127
160
return 0;
128
161
}
129
162
buffer_capacity += BUFFER_SIZE;
132
165
}
133
166
134
167
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
168
* Initialize GPGME.
137
169
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
144
172
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
173
gpgme_engine_info_t engine_info;
149
174
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
175
176
/*
177
* Helper function to insert pub and seckey to the engine keyring.
178
*/
179
bool import_key(const char *filename){
180
int ret;
181
int fd;
182
gpgme_data_t pgp_data;
183
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
if(fd == -1){
186
perror("open");
187
return false;
188
}
189
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
194
return false;
195
}
196
197
rc = gpgme_op_import(mc.ctx, pgp_data);
198
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
201
return false;
202
}
203
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
if(ret == -1){
206
perror("close");
207
}
208
gpgme_data_release(pgp_data);
209
return true;
210
}
211
212
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
152
214
}
153
215
154
216
/* Init GPGME */
155
217
gpgme_check_version(NULL);
156
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
219
if(rc != GPG_ERR_NO_ERROR){
158
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
221
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
222
return false;
161
223
}
162
224
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
225
/* Set GPGME home directory for the OpenPGP engine only */
226
rc = gpgme_get_engine_info(&engine_info);
227
if(rc != GPG_ERR_NO_ERROR){
166
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
229
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
230
return false;
169
231
}
170
232
while(engine_info != NULL){
171
233
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
234
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
235
engine_info->file_name, tempdir);
174
236
break;
175
237
}
176
238
engine_info = engine_info->next;
177
239
}
178
240
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
242
return false;
243
}
244
245
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
247
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
250
return false;
251
}
252
253
if(not import_key(pubkey) or not import_key(seckey)){
254
return false;
255
}
256
257
return true;
258
}
259
260
/*
261
* Decrypt OpenPGP data.
262
* Returns -1 on error
263
*/
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
size_t crypto_size,
266
char **plaintext){
267
gpgme_data_t dh_crypto, dh_plain;
268
gpgme_error_t rc;
269
ssize_t ret;
270
size_t plaintext_capacity = 0;
271
ssize_t plaintext_length = 0;
272
273
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
275
}
182
276
183
277
/* Create new GPGME data buffer from memory cryptotext */
184
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
279
0);
186
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
187
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
282
gpgme_strsource(rc), gpgme_strerror(rc));
189
283
return -1;
191
285
192
286
/* Create new empty GPGME data buffer for the plaintext */
193
287
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
288
if(rc != GPG_ERR_NO_ERROR){
195
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
290
gpgme_strsource(rc), gpgme_strerror(rc));
197
291
gpgme_data_release(dh_crypto);
198
292
return -1;
199
293
}
200
294
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
295
/* Decrypt data from the cryptotext data buffer to the plaintext
211
296
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
if(rc != GPG_ERR_NO_ERROR){
214
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
300
gpgme_strsource(rc), gpgme_strerror(rc));
216
301
plaintext_length = -1;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
302
if(debug){
303
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
305
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
307
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
312
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
314
}
315
gpgme_recipient_t recipient;
316
recipient = result->recipients;
240
317
while(recipient != NULL){
241
318
fprintf(stderr, "Public key algorithm: %s\n",
242
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
248
325
}
249
326
}
250
327
}
328
goto decrypt_end;
329
}
330
331
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
251
333
}
252
334
253
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
256
338
plaintext_length = -1;
257
339
goto decrypt_end;
258
340
}
259
341
260
342
*plaintext = NULL;
261
343
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
344
plaintext_capacity = incbuffer(plaintext,
263
345
(size_t)plaintext_length,
264
346
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
347
if(plaintext_capacity == 0){
348
perror("incbuffer");
267
349
plaintext_length = -1;
268
350
goto decrypt_end;
269
351
}
271
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
354
BUFFER_SIZE);
273
355
/* Print the data, if any */
274
if (ret == 0){
356
if(ret == 0){
275
357
/* EOF */
276
358
break;
277
359
}
282
364
}
283
365
plaintext_length += ret;
284
366
}
285
367
286
368
if(debug){
287
369
fprintf(stderr, "Decrypted password is: ");
288
370
for(ssize_t i = 0; i < plaintext_length; i++){
301
383
return plaintext_length;
302
384
}
303
385
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
307
390
ret = "(unknown)";
308
391
return ret;
309
392
}
314
397
fprintf(stderr, "GnuTLS: %s", string);
315
398
}
316
399
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
400
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
320
402
int ret;
321
403
322
404
if(debug){
324
406
}
325
407
326
408
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
330
412
return -1;
331
413
}
332
414
333
if (debug){
415
if(debug){
334
416
/* "Use a log level over 10 to enable all debugging options."
335
417
* - GnuTLS manual
336
418
*/
339
421
}
340
422
341
423
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
424
gnutls_certificate_allocate_credentials(&mc.cred);
425
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
431
gnutls_global_deinit();
347
432
return -1;
348
433
}
349
434
350
435
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
354
439
}
355
440
356
441
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
359
445
fprintf(stderr,
360
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
363
449
safer_gnutls_strerror(ret));
364
450
goto globalfail;
365
451
}
366
452
367
453
/* GnuTLS server initialization */
368
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
372
goto globalfail;
373
}
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
378
goto globalfail;
379
}
380
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
382
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
468
383
469
return 0;
384
470
385
471
globalfail:
386
387
gnutls_certificate_free_credentials(mc->cred);
472
473
gnutls_certificate_free_credentials(mc.cred);
388
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
389
476
return -1;
390
391
477
}
392
478
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
395
480
int ret;
396
481
/* GnuTLS session creation */
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
if(ret != GNUTLS_E_SUCCESS){
399
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
490
safer_gnutls_strerror(ret));
401
491
}
402
492
403
493
{
404
494
const char *err;
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
if(ret != GNUTLS_E_SUCCESS){
407
503
fprintf(stderr, "Syntax error at: %s\n", err);
408
504
fprintf(stderr, "GnuTLS error: %s\n",
409
505
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
506
gnutls_deinit(*session);
411
507
return -1;
412
508
}
413
509
}
414
510
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
if(ret != GNUTLS_E_SUCCESS){
418
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
521
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
522
gnutls_deinit(*session);
421
523
return -1;
422
524
}
423
525
424
526
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
427
528
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
530
430
531
return 0;
431
532
}
437
538
/* Called when a Mandos server is found */
438
539
static int start_mandos_communication(const char *ip, uint16_t port,
439
540
AvahiIfIndex if_index,
440
mandos_context *mc){
441
int ret, tcp_sd;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
541
int af){
542
int ret, tcp_sd = -1;
543
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
443
548
char *buffer = NULL;
444
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
445
550
size_t buffer_length = 0;
446
551
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
448
552
size_t written;
449
int retval = 0;
450
char interface[IF_NAMESIZE];
553
int retval = -1;
451
554
gnutls_session_t session;
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
555
int pf; /* Protocol family */
556
557
if(quit_now){
558
return -1;
559
}
560
561
switch(af){
562
case AF_INET6:
563
pf = PF_INET6;
564
break;
565
case AF_INET:
566
pf = PF_INET;
567
break;
568
default:
569
fprintf(stderr, "Bad address family: %d\n", af);
570
return -1;
571
}
572
573
ret = init_gnutls_session(&session);
574
if(ret != 0){
455
575
return -1;
456
576
}
457
577
458
578
if(debug){
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
580
"\n", ip, port);
461
581
}
462
582
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
if(tcp_sd < 0) {
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
if(tcp_sd < 0){
465
585
perror("socket");
466
return -1;
467
}
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
472
return -1;
473
}
474
fprintf(stderr, "Binding to interface %s\n", interface);
475
}
476
477
memset(&to,0,sizeof(to)); /* Spurious warning */
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
586
goto mandos_end;
587
}
588
589
if(quit_now){
590
goto mandos_end;
591
}
592
593
memset(&to, 0, sizeof(to));
594
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
600
}
601
if(ret < 0 ){
483
602
perror("inet_pton");
484
return -1;
603
goto mandos_end;
485
604
}
486
605
if(ret == 0){
487
606
fprintf(stderr, "Bad address: %s\n", ip);
488
return -1;
489
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
607
goto mandos_end;
608
}
609
if(af == AF_INET6){
610
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
-Wconversion and
612
-Wunreachable-code */
613
614
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
615
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
616
-Wunreachable-code*/
617
if(if_index == AVAHI_IF_UNSPEC){
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
" without a network interface\n");
620
goto mandos_end;
621
}
622
/* Set the network interface number as scope */
623
to.in6.sin6_scope_id = (uint32_t)if_index;
624
}
625
} else {
626
to.in.sin_port = htons(port); /* Spurious warnings from
627
-Wconversion and
628
-Wunreachable-code */
629
}
491
630
492
to.in6.sin6_scope_id = (uint32_t)if_index;
631
if(quit_now){
632
goto mandos_end;
633
}
493
634
494
635
if(debug){
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
636
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
char interface[IF_NAMESIZE];
638
if(if_indextoname((unsigned int)if_index, interface) == NULL){
639
perror("if_indextoname");
640
} else {
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
642
ip, interface, port);
643
}
644
} else {
645
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
646
port);
647
}
648
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
649
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
650
const char *pcret;
651
if(af == AF_INET6){
652
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
653
sizeof(addrstr));
654
} else {
655
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
656
sizeof(addrstr));
657
}
658
if(pcret == NULL){
500
659
perror("inet_ntop");
501
660
} else {
502
661
if(strcmp(addrstr, ip) != 0){
505
664
}
506
665
}
507
666
508
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
667
if(quit_now){
668
goto mandos_end;
669
}
670
671
if(af == AF_INET6){
672
ret = connect(tcp_sd, &to.in6, sizeof(to));
673
} else {
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
675
}
676
if(ret < 0){
510
677
perror("connect");
511
return -1;
512
}
513
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
683
}
684
514
685
const char *out = mandos_protocol_version;
515
686
written = 0;
516
while (true){
687
while(true){
517
688
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
690
out_size - written));
520
if (ret == -1){
691
if(ret == -1){
521
692
perror("write");
522
retval = -1;
523
693
goto mandos_end;
524
694
}
525
695
written += (size_t)ret;
526
696
if(written < out_size){
527
697
continue;
528
698
} else {
529
if (out == mandos_protocol_version){
699
if(out == mandos_protocol_version){
530
700
written = 0;
531
701
out = "\r\n";
532
702
} else {
533
703
break;
534
704
}
535
705
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
536
710
}
537
711
538
712
if(debug){
539
713
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
714
}
541
715
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
544
do{
545
ret = gnutls_handshake (session);
716
if(quit_now){
717
goto mandos_end;
718
}
719
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
721
722
if(quit_now){
723
goto mandos_end;
724
}
725
726
do {
727
ret = gnutls_handshake(session);
728
if(quit_now){
729
goto mandos_end;
730
}
546
731
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
547
732
548
if (ret != GNUTLS_E_SUCCESS){
733
if(ret != GNUTLS_E_SUCCESS){
549
734
if(debug){
550
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
736
gnutls_perror(ret);
552
737
}
553
retval = -1;
554
738
goto mandos_end;
555
739
}
556
740
557
741
/* Read OpenPGP packet that contains the wanted password */
558
742
559
743
if(debug){
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
745
ip);
562
746
}
563
747
564
748
while(true){
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
buffer_capacity = incbuffer(&buffer, buffer_length,
566
755
buffer_capacity);
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
569
retval = -1;
570
goto mandos_end;
571
}
572
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
756
if(buffer_capacity == 0){
757
perror("incbuffer");
758
goto mandos_end;
759
}
760
761
if(quit_now){
762
goto mandos_end;
763
}
764
765
sret = gnutls_record_recv(session, buffer+buffer_length,
766
BUFFER_SIZE);
767
if(sret == 0){
576
768
break;
577
769
}
578
if (ret < 0){
579
switch(ret){
770
if(sret < 0){
771
switch(sret){
580
772
case GNUTLS_E_INTERRUPTED:
581
773
case GNUTLS_E_AGAIN:
582
774
break;
583
775
case GNUTLS_E_REHANDSHAKE:
584
do{
585
ret = gnutls_handshake (session);
776
do {
777
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
586
782
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
587
if (ret < 0){
783
if(ret < 0){
588
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
590
retval = -1;
785
gnutls_perror(ret);
591
786
goto mandos_end;
592
787
}
593
788
break;
594
789
default:
595
790
fprintf(stderr, "Unknown error while reading data from"
596
791
" encrypted session with Mandos server\n");
597
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
792
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
793
goto mandos_end;
600
794
}
601
795
} else {
602
buffer_length += (size_t) ret;
796
buffer_length += (size_t) sret;
603
797
}
604
798
}
605
799
607
801
fprintf(stderr, "Closing TLS session\n");
608
802
}
609
803
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
612
if (buffer_length > 0){
804
if(quit_now){
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
if(quit_now){
811
goto mandos_end;
812
}
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
815
if(buffer_length > 0){
816
ssize_t decrypted_buffer_size;
613
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
614
818
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
819
&decrypted_buffer);
820
if(decrypted_buffer_size >= 0){
821
618
822
written = 0;
619
823
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
824
if(quit_now){
825
goto mandos_end;
826
}
827
828
ret = (int)fwrite(decrypted_buffer + written, 1,
829
(size_t)decrypted_buffer_size - written,
830
stdout);
623
831
if(ret == 0 and ferror(stdout)){
624
832
if(debug){
625
833
fprintf(stderr, "Error writing encrypted data: %s\n",
626
834
strerror(errno));
627
835
}
628
retval = -1;
629
break;
836
goto mandos_end;
630
837
}
631
838
written += (size_t)ret;
632
839
}
633
free(decrypted_buffer);
634
} else {
635
retval = -1;
840
retval = 0;
636
841
}
637
842
}
638
843
639
844
/* Shutdown procedure */
640
845
641
846
mandos_end:
847
free(decrypted_buffer);
642
848
free(buffer);
643
close(tcp_sd);
644
gnutls_deinit (session);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
645
859
return retval;
646
860
}
647
861
648
862
static void resolve_callback(AvahiSServiceResolver *r,
649
863
AvahiIfIndex interface,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
864
AvahiProtocol proto,
651
865
AvahiResolverEvent event,
652
866
const char *name,
653
867
const char *type,
658
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
659
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
660
874
flags,
661
void* userdata) {
662
mandos_context *mc = userdata;
663
assert(r); /* Spurious warning */
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
664
877
665
878
/* Called whenever a service has been resolved successfully or
666
879
timed out */
667
880
668
switch (event) {
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
669
886
default:
670
887
case AVAHI_RESOLVER_FAILURE:
671
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
672
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
673
avahi_strerror(avahi_server_errno(mc->server)));
890
avahi_strerror(avahi_server_errno(mc.server)));
674
891
break;
675
892
676
893
case AVAHI_RESOLVER_FOUND:
679
896
avahi_address_snprint(ip, sizeof(ip), address);
680
897
if(debug){
681
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
684
901
}
685
int ret = start_mandos_communication(ip, port, interface, mc);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
904
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
688
906
}
689
907
}
690
908
}
691
909
avahi_s_service_resolver_free(r);
692
910
}
693
911
694
static void browse_callback( AvahiSServiceBrowser *b,
695
AvahiIfIndex interface,
696
AvahiProtocol protocol,
697
AvahiBrowserEvent event,
698
const char *name,
699
const char *type,
700
const char *domain,
701
AVAHI_GCC_UNUSED AvahiLookupResultFlags
702
flags,
703
void* userdata) {
704
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
912
static void browse_callback(AvahiSServiceBrowser *b,
913
AvahiIfIndex interface,
914
AvahiProtocol protocol,
915
AvahiBrowserEvent event,
916
const char *name,
917
const char *type,
918
const char *domain,
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
706
923
707
924
/* Called whenever a new services becomes available on the LAN or
708
925
is removed from the LAN */
709
926
710
switch (event) {
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
711
932
default:
712
933
case AVAHI_BROWSER_FAILURE:
713
934
714
935
fprintf(stderr, "(Avahi browser) %s\n",
715
avahi_strerror(avahi_server_errno(mc->server)));
716
avahi_simple_poll_quit(mc->simple_poll);
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
717
938
return;
718
939
719
940
case AVAHI_BROWSER_NEW:
722
943
the callback function is called the Avahi server will free the
723
944
resolver for us. */
724
945
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
726
protocol, name, type, domain,
727
AVAHI_PROTO_INET6, 0,
728
resolve_callback, mc)))
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
729
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
730
name, avahi_strerror(avahi_server_errno(mc->server)));
950
name, avahi_strerror(avahi_server_errno(mc.server)));
731
951
break;
732
952
733
953
case AVAHI_BROWSER_REMOVE:
742
962
}
743
963
}
744
964
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
751
if (tmp == NULL){
752
return NULL;
753
}
754
if(f_len > 0){
755
memcpy(tmp, first, f_len); /* Spurious warning */
756
}
757
tmp[f_len] = '/';
758
if(s_len > 0){
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
760
}
761
tmp[f_len + 1 + s_len] = '\0';
762
return tmp;
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
763
977
}
764
978
979
/*
980
* This function determines if a directory entry in /sys/class/net
981
* corresponds to an acceptable network device.
982
* (This function is passed to scandir(3) as a filter function.)
983
*/
984
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
994
return 0;
995
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1007
perror("malloc");
1008
close(flags_fd);
1009
return 0;
1010
}
1011
while(to_read > 0){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1013
(size_t)to_read));
1014
if(ssret == -1){
1015
perror("read");
1016
free(flagstring);
1017
close(flags_fd);
1018
return 0;
1019
}
1020
to_read -= ssret;
1021
if(ssret == 0){
1022
break;
1023
}
1024
}
1025
close(flags_fd);
1026
intmax_t tmpmax;
1027
char *tmp;
1028
errno = 0;
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1033
if(debug){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1036
}
1037
free(flagstring);
1038
return 0;
1039
}
1040
free(flagstring);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1044
if(debug){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1046
if_entry->d_name);
1047
}
1048
return 0;
1049
}
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1052
if(debug){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1054
if_entry->d_name);
1055
}
1056
return 1;
1057
}
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1060
if(debug){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1062
if_entry->d_name);
1063
}
1064
return 0;
1065
}
1066
/* Accept this device */
1067
if(debug){
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1069
if_entry->d_name);
1070
}
1071
return 1;
1072
}
765
1073
766
1074
int main(int argc, char *argv[]){
767
AvahiSServiceBrowser *sb = NULL;
768
int error;
769
int ret;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
773
int sd;
774
uid_t uid;
775
gid_t gid;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
783
784
{
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
791
.group = 1 },
792
{ .name = "interface", .key = 'i',
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
799
.group = 1 },
800
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
803
.group = 1 },
804
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
807
.group = 2 },
808
{ .name = "dh-bits", .key = 129,
809
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
811
.group = 2 },
812
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
815
{ .name = NULL }
816
};
817
818
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
825
debug = true;
826
break;
827
case 'c':
828
connect_to = arg;
829
break;
830
case 'i':
831
interface = arg;
832
break;
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
847
exit(EXIT_FAILURE);
848
}
849
break;
850
case 130:
851
mc.priority = arg;
852
break;
853
case ARGP_KEY_ARG:
854
argp_usage (state);
855
break;
856
case ARGP_KEY_END:
857
break;
858
default:
859
return ARGP_ERR_UNKNOWN;
860
}
861
return 0;
862
}
863
864
struct argp argp = { .options = options, .parser = parse_opt,
865
.args_doc = "",
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
1075
AvahiSServiceBrowser *sb = NULL;
1076
int error;
1077
int ret;
1078
intmax_t tmpmax;
1079
char *tmp;
1080
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
1082
struct ifreq network;
1083
int sd = -1;
1084
bool take_down_interface = false;
1085
uid_t uid;
1086
gid_t gid;
1087
char tempdir[] = "/tmp/mandosXXXXXX";
1088
bool tempdir_created = false;
1089
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
const char *seckey = PATHDIR "/" SECKEY;
1091
const char *pubkey = PATHDIR "/" PUBKEY;
1092
1093
bool gnutls_initialized = false;
1094
bool gpgme_initialized = false;
1095
float delay = 2.5f;
1096
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1098
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1099
1100
uid = getuid();
1101
gid = getgid();
1102
1103
/* Lower any group privileges we might have, just to be safe */
1104
errno = 0;
1105
ret = setgid(gid);
1106
if(ret == -1){
1107
perror("setgid");
1108
}
1109
1110
/* Lower user privileges (temporarily) */
1111
errno = 0;
1112
ret = seteuid(uid);
1113
if(ret == -1){
1114
perror("seteuid");
1115
}
1116
1117
if(quit_now){
1118
goto end;
1119
}
1120
1121
{
1122
struct argp_option options[] = {
1123
{ .name = "debug", .key = 128,
1124
.doc = "Debug mode", .group = 3 },
1125
{ .name = "connect", .key = 'c',
1126
.arg = "ADDRESS:PORT",
1127
.doc = "Connect directly to a specific Mandos server",
1128
.group = 1 },
1129
{ .name = "interface", .key = 'i',
1130
.arg = "NAME",
1131
.doc = "Network interface that will be used to search for"
1132
" Mandos servers",
1133
.group = 1 },
1134
{ .name = "seckey", .key = 's',
1135
.arg = "FILE",
1136
.doc = "OpenPGP secret key file base name",
1137
.group = 1 },
1138
{ .name = "pubkey", .key = 'p',
1139
.arg = "FILE",
1140
.doc = "OpenPGP public key file base name",
1141
.group = 2 },
1142
{ .name = "dh-bits", .key = 129,
1143
.arg = "BITS",
1144
.doc = "Bit length of the prime number used in the"
1145
" Diffie-Hellman key exchange",
1146
.group = 2 },
1147
{ .name = "priority", .key = 130,
1148
.arg = "STRING",
1149
.doc = "GnuTLS priority string for the TLS handshake",
1150
.group = 1 },
1151
{ .name = "delay", .key = 131,
1152
.arg = "SECONDS",
1153
.doc = "Maximum delay to wait for interface startup",
1154
.group = 2 },
1155
{ .name = NULL }
1156
};
1157
1158
error_t parse_opt(int key, char *arg,
1159
struct argp_state *state){
1160
switch(key){
1161
case 128: /* --debug */
1162
debug = true;
1163
break;
1164
case 'c': /* --connect */
1165
connect_to = arg;
1166
break;
1167
case 'i': /* --interface */
1168
interface = arg;
1169
break;
1170
case 's': /* --seckey */
1171
seckey = arg;
1172
break;
1173
case 'p': /* --pubkey */
1174
pubkey = arg;
1175
break;
1176
case 129: /* --dh-bits */
1177
errno = 0;
1178
tmpmax = strtoimax(arg, &tmp, 10);
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
1183
}
1184
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1185
break;
1186
case 130: /* --priority */
1187
mc.priority = arg;
1188
break;
1189
case 131: /* --delay */
1190
errno = 0;
1191
delay = strtof(arg, &tmp);
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1195
}
1196
break;
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
1200
break;
1201
default:
1202
return ARGP_ERR_UNKNOWN;
1203
}
1204
return 0;
1205
}
1206
1207
struct argp argp = { .options = options, .parser = parse_opt,
1208
.args_doc = "",
1209
.doc = "Mandos client -- Get and decrypt"
1210
" passwords from a Mandos server" };
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1216
}
1217
}
1218
1219
if(not debug){
1220
avahi_set_log_function(empty_log);
1221
}
1222
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1226
alphasort);
1227
if(ret >= 1){
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1230
if(debug){
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1232
}
1233
if(interface == NULL){
1234
perror("malloc");
1235
free(direntries);
871
1236
exitcode = EXIT_FAILURE;
872
1237
goto end;
873
1238
}
874
}
875
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
1239
free(direntries);
893
1240
} else {
894
gnutls_initalized = true;
895
}
896
897
uid = getuid();
898
gid = getgid();
899
900
ret = setuid(uid);
901
if (ret == -1){
902
perror("setuid");
903
}
904
905
setgid(gid);
906
if (ret == -1){
907
perror("setgid");
908
}
909
1241
free(direntries);
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1244
goto end;
1245
}
1246
}
1247
1248
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
from the signal handler */
1250
/* Initialize the pseudo-RNG for Avahi */
1251
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
sigemptyset(&sigterm_action.sa_mask);
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1261
if(ret == -1){
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1264
goto end;
1265
}
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1267
if(ret == -1){
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1270
goto end;
1271
}
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1273
if(ret == -1){
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1276
goto end;
1277
}
1278
/* Need to check if the handler is SIG_IGN before handling:
1279
| [[info:libc:Initial Signal Actions]] |
1280
| [[info:libc:Basic Signal Handling]] |
1281
*/
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1283
if(ret == -1){
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1286
}
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1289
if(ret == -1){
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1292
goto end;
1293
}
1294
}
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1296
if(ret == -1){
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1299
}
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1302
if(ret == -1){
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1305
goto end;
1306
}
1307
}
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1309
if(ret == -1){
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1312
}
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1315
if(ret == -1){
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
}
1321
1322
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
910
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
911
1325
if(if_index == 0){
912
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
exit(EXIT_FAILURE);
914
}
915
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
920
if(address == NULL){
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
923
goto end;
924
}
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
930
goto end;
931
}
932
*address = '\0';
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
935
if(ret < 0){
936
exitcode = EXIT_FAILURE;
937
} else {
938
exitcode = EXIT_SUCCESS;
939
}
940
goto end;
941
}
942
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
953
if(ret == -1){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
1327
exitcode = EXIT_FAILURE;
1328
goto end;
1329
}
1330
1331
if(quit_now){
1332
goto end;
1333
}
1334
1335
/* Re-raise priviliges */
1336
errno = 0;
1337
ret = seteuid(0);
1338
if(ret == -1){
1339
perror("seteuid");
1340
}
1341
1342
#ifdef __linux__
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
messages to mess up the prompt */
1345
ret = klogctl(8, NULL, 5);
1346
bool restore_loglevel = true;
1347
if(ret == -1){
1348
restore_loglevel = false;
1349
perror("klogctl");
1350
}
1351
#endif /* __linux__ */
1352
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1354
if(sd < 0){
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1357
#ifdef __linux__
1358
if(restore_loglevel){
1359
ret = klogctl(7, NULL, 0);
1360
if(ret == -1){
1361
perror("klogctl");
1362
}
1363
}
1364
#endif /* __linux__ */
1365
/* Lower privileges */
1366
errno = 0;
1367
ret = seteuid(uid);
1368
if(ret == -1){
1369
perror("seteuid");
1370
}
1371
goto end;
1372
}
1373
strcpy(network.ifr_name, interface);
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
if(ret == -1){
1376
perror("ioctl SIOCGIFFLAGS");
1377
#ifdef __linux__
1378
if(restore_loglevel){
1379
ret = klogctl(7, NULL, 0);
1380
if(ret == -1){
1381
perror("klogctl");
1382
}
1383
}
1384
#endif /* __linux__ */
1385
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
if((network.ifr_flags & IFF_UP) == 0){
1395
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1398
if(ret == -1){
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1402
#ifdef __linux__
1403
if(restore_loglevel){
1404
ret = klogctl(7, NULL, 0);
1405
if(ret == -1){
1406
perror("klogctl");
1407
}
1408
}
1409
#endif /* __linux__ */
1410
/* Lower privileges */
1411
errno = 0;
1412
ret = seteuid(uid);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
goto end;
1417
}
1418
}
1419
/* sleep checking until interface is running */
1420
for(int i=0; i < delay * 4; i++){
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1422
if(ret == -1){
1423
perror("ioctl SIOCGIFFLAGS");
1424
} else if(network.ifr_flags & IFF_RUNNING){
1425
break;
1426
}
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1428
ret = nanosleep(&sleeptime, NULL);
1429
if(ret == -1 and errno != EINTR){
1430
perror("nanosleep");
1431
}
1432
}
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1436
if(ret == -1){
1437
perror("close");
1438
}
1439
}
1440
#ifdef __linux__
1441
if(restore_loglevel){
1442
/* Restores kernel loglevel to default */
1443
ret = klogctl(7, NULL, 0);
1444
if(ret == -1){
1445
perror("klogctl");
1446
}
1447
}
1448
#endif /* __linux__ */
1449
/* Lower privileges */
1450
errno = 0;
1451
if(take_down_interface){
1452
/* Lower privileges */
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror("seteuid");
1456
}
1457
} else {
1458
/* Lower privileges permanently */
1459
ret = setuid(uid);
1460
if(ret == -1){
1461
perror("setuid");
1462
}
1463
}
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
ret = init_gnutls_global(pubkey, seckey);
1471
if(ret == -1){
1472
fprintf(stderr, "init_gnutls_global failed\n");
1473
exitcode = EXIT_FAILURE;
1474
goto end;
1475
} else {
1476
gnutls_initialized = true;
1477
}
1478
1479
if(quit_now){
1480
goto end;
1481
}
1482
1483
tempdir_created = true;
1484
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1486
perror("mkdtemp");
1487
goto end;
1488
}
1489
1490
if(quit_now){
1491
goto end;
1492
}
1493
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
fprintf(stderr, "init_gpgme failed\n");
1496
exitcode = EXIT_FAILURE;
1497
goto end;
1498
} else {
1499
gpgme_initialized = true;
1500
}
1501
1502
if(quit_now){
1503
goto end;
1504
}
1505
1506
if(connect_to != NULL){
1507
/* Connect directly, do not use Zeroconf */
1508
/* (Mainly meant for debugging) */
1509
char *address = strrchr(connect_to, ':');
1510
if(address == NULL){
1511
fprintf(stderr, "No colon in address\n");
1512
exitcode = EXIT_FAILURE;
1513
goto end;
1514
}
1515
1516
if(quit_now){
1517
goto end;
1518
}
1519
1520
uint16_t port;
1521
errno = 0;
1522
tmpmax = strtoimax(address+1, &tmp, 10);
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1525
fprintf(stderr, "Bad port number\n");
1526
exitcode = EXIT_FAILURE;
1527
goto end;
1528
}
1529
1530
if(quit_now){
1531
goto end;
1532
}
1533
1534
port = (uint16_t)tmpmax;
1535
*address = '\0';
1536
address = connect_to;
1537
/* Colon in address indicates IPv6 */
1538
int af;
1539
if(strchr(address, ':') != NULL){
1540
af = AF_INET6;
1541
} else {
1542
af = AF_INET;
1543
}
1544
1545
if(quit_now){
1546
goto end;
1547
}
1548
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
1553
exitcode = EXIT_SUCCESS;
1554
}
1555
goto end;
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
{
1563
AvahiServerConfig config;
1564
/* Do not publish any local Zeroconf records */
1565
avahi_server_config_init(&config);
1566
config.publish_hinfo = 0;
1567
config.publish_addresses = 0;
1568
config.publish_workstation = 0;
1569
config.publish_domain = 0;
1570
1571
/* Allocate a new server */
1572
mc.server = avahi_server_new(avahi_simple_poll_get
1573
(mc.simple_poll), &config, NULL,
1574
NULL, &error);
1575
1576
/* Free the Avahi configuration data */
1577
avahi_server_config_free(&config);
1578
}
1579
1580
/* Check if creating the Avahi server object succeeded */
1581
if(mc.server == NULL){
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1583
avahi_strerror(error));
1584
exitcode = EXIT_FAILURE;
1585
goto end;
1586
}
1587
1588
if(quit_now){
1589
goto end;
1590
}
1591
1592
/* Create the Avahi service browser */
1593
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1595
NULL, 0, browse_callback, NULL);
1596
if(sb == NULL){
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1598
avahi_strerror(avahi_server_errno(mc.server)));
1599
exitcode = EXIT_FAILURE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1607
/* Run the main loop */
1608
1609
if(debug){
1610
fprintf(stderr, "Starting Avahi loop search\n");
1611
}
1612
1613
avahi_simple_poll_loop(mc.simple_poll);
1614
1615
end:
1616
1617
if(debug){
1618
fprintf(stderr, "%s exiting\n", argv[0]);
1619
}
1620
1621
/* Cleanup things */
1622
if(sb != NULL)
1623
avahi_s_service_browser_free(sb);
1624
1625
if(mc.server != NULL)
1626
avahi_server_free(mc.server);
1627
1628
if(mc.simple_poll != NULL)
1629
avahi_simple_poll_free(mc.simple_poll);
1630
1631
if(gnutls_initialized){
1632
gnutls_certificate_free_credentials(mc.cred);
1633
gnutls_global_deinit();
1634
gnutls_dh_params_deinit(mc.dh_params);
1635
}
1636
1637
if(gpgme_initialized){
1638
gpgme_release(mc.ctx);
1639
}
1640
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1644
errno = 0;
1645
ret = seteuid(0);
1646
if(ret == -1){
1647
perror("seteuid");
1648
}
1649
if(geteuid() == 0){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
960
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
1656
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
967
close(sd);
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
1032
end:
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1658
}
1659
}
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror("close");
1663
}
1664
/* Lower privileges permanently */
1665
errno = 0;
1666
ret = setuid(uid);
1667
if(ret == -1){
1668
perror("setuid");
1669
}
1670
}
1671
}
1672
1673
/* Removes the temp directory used by GPGME */
1674
if(tempdir_created){
1675
DIR *d;
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1678
if(d == NULL){
1679
if(errno != ENOENT){
1680
perror("opendir");
1681
}
1682
} else {
1683
while(true){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1686
break;
1687
}
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1693
continue;
1694
}
1695
char *fullname = NULL;
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
1697
direntry->d_name);
1698
if(ret < 0){
1699
perror("asprintf");
1700
continue;
1701
}
1702
ret = remove(fullname);
1703
if(ret == -1){
1704
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1705
strerror(errno));
1706
}
1707
free(fullname);
1708
}
1709
closedir(d);
1710
}
1711
ret = rmdir(tempdir);
1712
if(ret == -1 and errno != ENOENT){
1713
perror("rmdir");
1714
}
1715
}
1716
1717
if(quit_now){
1718
sigemptyset(&old_sigterm_action.sa_mask);
1719
old_sigterm_action.sa_handler = SIG_DFL;
1720
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1721
&old_sigterm_action,
1722
NULL));
1723
if(ret == -1){
1724
perror("sigaction");
1725
}
1726
do {
1727
ret = raise(signal_received);
1728
} while(ret != 0 and errno == EINTR);
1729
if(ret != 0){
1730
perror("raise");
1731
abort();
1732
}
1733
TEMP_FAILURE_RETRY(pause());
1734
}
1735
1736
return exitcode;
1056
1737
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0