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- Committer: teddy at bsnet
- Date: 2010-08-10 19:08:24 UTC
- mto: This revision was merged to the branch mainline in revision 419.
- Revision ID: teddy@fukt.bsnet.se-20100810190824-5yquozxy4kh6py3f
* plugins.d/mandos-client.c: An empty interface name now means to
autodetect an interface; to specify no
particular interface, use "none".
(sys_class_net): New global variable for the "/sys/class/net" path.
(good_interface): New function to determine the suitability of an
interface. Used by a scandir() call in main().
(main): Changed default value for "interface" to the empty string.
Moved "connect_to" to be a global variable. Only take down
and up interface if its name is not "none".
* plugins.d/mandos-client.xml (OPTIONS): Update documentation for the
"--interface" option.
autodetect an interface; to specify no
particular interface, use "none".
(sys_class_net): New global variable for the "/sys/class/net" path.
(good_interface): New function to determine the suitability of an
interface. Used by a scandir() call in main().
(main): Changed default value for "interface" to the empty string.
Moved "connect_to" to be a global variable. Only take down
and up interface if its name is not "none".
* plugins.d/mandos-client.xml (OPTIONS): Update documentation for the
"--interface" option.
- 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 */
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
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() */
55
64
#include <assert.h> /* assert() */
56
65
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
58
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
61
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
65
76
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
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__ */
71
89
72
90
/* Avahi */
73
91
/* All Avahi types, constants and functions
81
99
#include <avahi-common/error.h>
82
100
83
101
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
85
104
gnutls_*
86
105
init_gnutls_session(),
87
106
GNUTLS_* */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
109
GNUTLS_OPENPGP_FMT_BASE64 */
90
110
91
111
/* GPGME */
92
#include <gpgme.h> /* All GPGME types, constants and functions
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
93
114
gpgme_*
94
115
GPGME_PROTOCOL_OpenPGP,
95
116
GPG_ERR_NO_* */
96
117
97
118
#define BUFFER_SIZE 256
98
119
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
99
124
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
101
125
static const char mandos_protocol_version[] = "1";
102
const char *argp_program_version = "password-request 1.0";
126
const char *argp_program_version = "mandos-client " VERSION;
103
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;
104
130
105
131
/* Used for passing in values through the Avahi callback functions */
106
132
typedef struct {
110
136
unsigned int dh_bits;
111
137
gnutls_dh_params_t dh_params;
112
138
const char *priority;
139
gpgme_ctx_t ctx;
113
140
} mandos_context;
114
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
115
150
/*
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "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,
118
153
* "buffer_length" is how much is already used.
119
154
*/
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t incbuffer(char **buffer, size_t buffer_length,
121
156
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
124
if (buffer == NULL){
159
if(buffer == NULL){
125
160
return 0;
126
161
}
127
162
buffer_capacity += BUFFER_SIZE;
130
165
}
131
166
132
167
/*
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
168
* Initialize GPGME.
135
169
*/
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
142
172
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
146
173
gpgme_engine_info_t engine_info;
147
174
148
if (debug){
149
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");
150
214
}
151
215
152
216
/* Init GPGME */
153
217
gpgme_check_version(NULL);
154
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
155
if (rc != GPG_ERR_NO_ERROR){
219
if(rc != GPG_ERR_NO_ERROR){
156
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
157
221
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
222
return false;
159
223
}
160
224
161
/* Set GPGME home directory for the OpenPGP engine only */
162
rc = gpgme_get_engine_info (&engine_info);
163
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){
164
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
165
229
gpgme_strsource(rc), gpgme_strerror(rc));
166
return -1;
230
return false;
167
231
}
168
232
while(engine_info != NULL){
169
233
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
170
234
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
171
engine_info->file_name, homedir);
235
engine_info->file_name, tempdir);
172
236
break;
173
237
}
174
238
engine_info = engine_info->next;
175
239
}
176
240
if(engine_info == NULL){
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
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");
179
275
}
180
276
181
277
/* Create new GPGME data buffer from memory cryptotext */
182
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
183
279
0);
184
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
185
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
282
gpgme_strsource(rc), gpgme_strerror(rc));
187
283
return -1;
189
285
190
286
/* Create new empty GPGME data buffer for the plaintext */
191
287
rc = gpgme_data_new(&dh_plain);
192
if (rc != GPG_ERR_NO_ERROR){
288
if(rc != GPG_ERR_NO_ERROR){
193
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
290
gpgme_strsource(rc), gpgme_strerror(rc));
195
291
gpgme_data_release(dh_crypto);
196
292
return -1;
197
293
}
198
294
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
208
295
/* Decrypt data from the cryptotext data buffer to the plaintext
209
296
data buffer */
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
if(rc != GPG_ERR_NO_ERROR){
212
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
300
gpgme_strsource(rc), gpgme_strerror(rc));
214
301
plaintext_length = -1;
215
goto decrypt_end;
216
}
217
218
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
}
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
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;
238
317
while(recipient != NULL){
239
318
fprintf(stderr, "Public key algorithm: %s\n",
240
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
246
325
}
247
326
}
248
327
}
328
goto decrypt_end;
329
}
330
331
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
249
333
}
250
334
251
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
254
338
plaintext_length = -1;
255
339
goto decrypt_end;
256
340
}
257
341
258
342
*plaintext = NULL;
259
343
while(true){
260
plaintext_capacity = adjustbuffer(plaintext,
344
plaintext_capacity = incbuffer(plaintext,
261
345
(size_t)plaintext_length,
262
346
plaintext_capacity);
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
347
if(plaintext_capacity == 0){
348
perror("incbuffer");
265
349
plaintext_length = -1;
266
350
goto decrypt_end;
267
351
}
269
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
270
354
BUFFER_SIZE);
271
355
/* Print the data, if any */
272
if (ret == 0){
356
if(ret == 0){
273
357
/* EOF */
274
358
break;
275
359
}
280
364
}
281
365
plaintext_length += ret;
282
366
}
283
367
284
368
if(debug){
285
369
fprintf(stderr, "Decrypted password is: ");
286
370
for(ssize_t i = 0; i < plaintext_length; i++){
299
383
return plaintext_length;
300
384
}
301
385
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
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)
305
390
ret = "(unknown)";
306
391
return ret;
307
392
}
312
397
fprintf(stderr, "GnuTLS: %s", string);
313
398
}
314
399
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
400
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
318
402
int ret;
319
403
320
404
if(debug){
322
406
}
323
407
324
408
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
328
412
return -1;
329
413
}
330
414
331
if (debug){
415
if(debug){
332
416
/* "Use a log level over 10 to enable all debugging options."
333
417
* - GnuTLS manual
334
418
*/
337
421
}
338
422
339
423
/* OpenPGP credentials */
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
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();
345
432
return -1;
346
433
}
347
434
348
435
if(debug){
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
352
439
}
353
440
354
441
ret = gnutls_certificate_set_openpgp_key_file
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
357
445
fprintf(stderr,
358
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
361
449
safer_gnutls_strerror(ret));
362
450
goto globalfail;
363
451
}
364
452
365
453
/* GnuTLS server initialization */
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
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
381
469
return 0;
382
470
383
471
globalfail:
384
385
gnutls_certificate_free_credentials(mc->cred);
472
473
gnutls_certificate_free_credentials(mc.cred);
386
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
387
476
return -1;
388
389
477
}
390
478
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
393
480
int ret;
394
481
/* GnuTLS session creation */
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
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){
397
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
490
safer_gnutls_strerror(ret));
399
491
}
400
492
401
493
{
402
494
const char *err;
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
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){
405
503
fprintf(stderr, "Syntax error at: %s\n", err);
406
504
fprintf(stderr, "GnuTLS error: %s\n",
407
505
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
506
gnutls_deinit(*session);
409
507
return -1;
410
508
}
411
509
}
412
510
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
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){
416
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
417
521
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
522
gnutls_deinit(*session);
419
523
return -1;
420
524
}
421
525
422
526
/* ignore client certificate if any. */
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
425
528
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
427
530
428
531
return 0;
429
532
}
435
538
/* Called when a Mandos server is found */
436
539
static int start_mandos_communication(const char *ip, uint16_t port,
437
540
AvahiIfIndex if_index,
438
mandos_context *mc){
439
int ret, tcp_sd;
440
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;
441
548
char *buffer = NULL;
442
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
443
550
size_t buffer_length = 0;
444
551
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
446
552
size_t written;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
553
int retval = -1;
449
554
gnutls_session_t session;
450
451
ret = init_gnutls_session (mc, &session);
452
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){
453
575
return -1;
454
576
}
455
577
456
578
if(debug){
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
458
580
"\n", ip, port);
459
581
}
460
582
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
if(tcp_sd < 0){
463
585
perror("socket");
464
return -1;
465
}
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
470
return -1;
471
}
472
fprintf(stderr, "Binding to interface %s\n", interface);
473
}
474
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
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 ){
481
602
perror("inet_pton");
482
return -1;
603
goto mandos_end;
483
604
}
484
605
if(ret == 0){
485
606
fprintf(stderr, "Bad address: %s\n", ip);
486
return -1;
487
}
488
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
}
489
630
490
to.in6.sin6_scope_id = (uint32_t)if_index;
631
if(quit_now){
632
goto mandos_end;
633
}
491
634
492
635
if(debug){
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
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){
498
659
perror("inet_ntop");
499
660
} else {
500
661
if(strcmp(addrstr, ip) != 0){
503
664
}
504
665
}
505
666
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
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){
508
677
perror("connect");
509
return -1;
510
}
511
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
683
}
684
512
685
const char *out = mandos_protocol_version;
513
686
written = 0;
514
while (true){
687
while(true){
515
688
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
690
out_size - written));
518
if (ret == -1){
691
if(ret == -1){
519
692
perror("write");
520
retval = -1;
521
693
goto mandos_end;
522
694
}
523
695
written += (size_t)ret;
524
696
if(written < out_size){
525
697
continue;
526
698
} else {
527
if (out == mandos_protocol_version){
699
if(out == mandos_protocol_version){
528
700
written = 0;
529
701
out = "\r\n";
530
702
} else {
531
703
break;
532
704
}
533
705
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
534
710
}
535
711
536
712
if(debug){
537
713
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
714
}
539
715
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
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
}
544
731
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
545
732
546
if (ret != GNUTLS_E_SUCCESS){
733
if(ret != GNUTLS_E_SUCCESS){
547
734
if(debug){
548
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
736
gnutls_perror(ret);
550
737
}
551
retval = -1;
552
738
goto mandos_end;
553
739
}
554
740
555
741
/* Read OpenPGP packet that contains the wanted password */
556
742
557
743
if(debug){
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
559
745
ip);
560
746
}
561
747
562
748
while(true){
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
buffer_capacity = incbuffer(&buffer, buffer_length,
564
755
buffer_capacity);
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
569
}
570
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
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){
574
768
break;
575
769
}
576
if (ret < 0){
577
switch(ret){
770
if(sret < 0){
771
switch(sret){
578
772
case GNUTLS_E_INTERRUPTED:
579
773
case GNUTLS_E_AGAIN:
580
774
break;
581
775
case GNUTLS_E_REHANDSHAKE:
582
do{
583
ret = gnutls_handshake (session);
776
do {
777
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
584
782
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
585
if (ret < 0){
783
if(ret < 0){
586
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
588
retval = -1;
785
gnutls_perror(ret);
589
786
goto mandos_end;
590
787
}
591
788
break;
592
789
default:
593
790
fprintf(stderr, "Unknown error while reading data from"
594
791
" encrypted session with Mandos server\n");
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
792
gnutls_bye(session, GNUTLS_SHUT_RDWR);
597
793
goto mandos_end;
598
794
}
599
795
} else {
600
buffer_length += (size_t) ret;
796
buffer_length += (size_t) sret;
601
797
}
602
798
}
603
799
605
801
fprintf(stderr, "Closing TLS session\n");
606
802
}
607
803
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
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;
611
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
818
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
819
&decrypted_buffer);
820
if(decrypted_buffer_size >= 0){
821
616
822
written = 0;
617
823
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
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);
621
831
if(ret == 0 and ferror(stdout)){
622
832
if(debug){
623
833
fprintf(stderr, "Error writing encrypted data: %s\n",
624
834
strerror(errno));
625
835
}
626
retval = -1;
627
break;
836
goto mandos_end;
628
837
}
629
838
written += (size_t)ret;
630
839
}
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
840
retval = 0;
634
841
}
635
842
}
636
843
637
844
/* Shutdown procedure */
638
845
639
846
mandos_end:
847
free(decrypted_buffer);
640
848
free(buffer);
641
close(tcp_sd);
642
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
}
643
859
return retval;
644
860
}
645
861
646
862
static void resolve_callback(AvahiSServiceResolver *r,
647
863
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
864
AvahiProtocol proto,
649
865
AvahiResolverEvent event,
650
866
const char *name,
651
867
const char *type,
656
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
657
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
874
flags,
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
662
877
663
878
/* Called whenever a service has been resolved successfully or
664
879
timed out */
665
880
666
switch (event) {
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
667
886
default:
668
887
case AVAHI_RESOLVER_FAILURE:
669
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
671
avahi_strerror(avahi_server_errno(mc->server)));
890
avahi_strerror(avahi_server_errno(mc.server)));
672
891
break;
673
892
674
893
case AVAHI_RESOLVER_FOUND:
677
896
avahi_address_snprint(ip, sizeof(ip), address);
678
897
if(debug){
679
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
682
901
}
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
avahi_simple_poll_quit(mc->simple_poll);
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);
686
906
}
687
907
}
688
908
}
689
909
avahi_s_service_resolver_free(r);
690
910
}
691
911
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
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);
704
923
705
924
/* Called whenever a new services becomes available on the LAN or
706
925
is removed from the LAN */
707
926
708
switch (event) {
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
709
932
default:
710
933
case AVAHI_BROWSER_FAILURE:
711
934
712
935
fprintf(stderr, "(Avahi browser) %s\n",
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
715
938
return;
716
939
717
940
case AVAHI_BROWSER_NEW:
720
943
the callback function is called the Avahi server will free the
721
944
resolver for us. */
722
945
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
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)
727
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
728
name, avahi_strerror(avahi_server_errno(mc->server)));
950
name, avahi_strerror(avahi_server_errno(mc.server)));
729
951
break;
730
952
731
953
case AVAHI_BROWSER_REMOVE:
740
962
}
741
963
}
742
964
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
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;
761
977
}
762
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);
1005
if(flagstring == NULL){
1006
perror("malloc");
1007
close(flags_fd);
1008
return 0;
1009
}
1010
while(to_read > 0){
1011
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1012
(size_t)to_read));
1013
if(ssret == -1){
1014
perror("read");
1015
free(flagstring);
1016
close(flags_fd);
1017
return 0;
1018
}
1019
to_read -= ssret;
1020
if(ssret == 0){
1021
break;
1022
}
1023
}
1024
close(flags_fd);
1025
intmax_t tmpmax;
1026
char *tmp;
1027
errno = 0;
1028
tmpmax = strtoimax(flagstring, &tmp, 0);
1029
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1030
and not (isspace(*tmp)))
1031
or tmpmax != (ifreq_flags)tmpmax){
1032
free(flagstring);
1033
return 0;
1034
}
1035
free(flagstring);
1036
ifreq_flags flags = (ifreq_flags)tmpmax;
1037
/* Reject the loopback device */
1038
if(flags & IFF_LOOPBACK){
1039
return 0;
1040
}
1041
/* Accept point-to-point devices only if connect_to is specified */
1042
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1043
return 1;
1044
}
1045
/* Otherwise, reject non-broadcast-capable devices */
1046
if(not (flags & IFF_BROADCAST)){
1047
return 0;
1048
}
1049
/* Accept this device */
1050
return 1;
1051
}
763
1052
764
1053
int main(int argc, char *argv[]){
765
AvahiSServiceBrowser *sb = NULL;
766
int error;
767
int ret;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
1054
AvahiSServiceBrowser *sb = NULL;
1055
int error;
1056
int ret;
1057
intmax_t tmpmax;
1058
char *tmp;
1059
int exitcode = EXIT_SUCCESS;
1060
const char *interface = "";
1061
struct ifreq network;
1062
int sd = -1;
1063
bool take_down_interface = false;
1064
uid_t uid;
1065
gid_t gid;
1066
char tempdir[] = "/tmp/mandosXXXXXX";
1067
bool tempdir_created = false;
1068
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1069
const char *seckey = PATHDIR "/" SECKEY;
1070
const char *pubkey = PATHDIR "/" PUBKEY;
1071
1072
bool gnutls_initialized = false;
1073
bool gpgme_initialized = false;
1074
float delay = 2.5f;
1075
1076
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1077
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1078
1079
uid = getuid();
1080
gid = getgid();
1081
1082
/* Lower any group privileges we might have, just to be safe */
1083
errno = 0;
1084
ret = setgid(gid);
1085
if(ret == -1){
1086
perror("setgid");
1087
}
1088
1089
/* Lower user privileges (temporarily) */
1090
errno = 0;
1091
ret = seteuid(uid);
1092
if(ret == -1){
1093
perror("seteuid");
1094
}
1095
1096
if(quit_now){
1097
goto end;
1098
}
1099
1100
{
1101
struct argp_option options[] = {
1102
{ .name = "debug", .key = 128,
1103
.doc = "Debug mode", .group = 3 },
1104
{ .name = "connect", .key = 'c',
1105
.arg = "ADDRESS:PORT",
1106
.doc = "Connect directly to a specific Mandos server",
1107
.group = 1 },
1108
{ .name = "interface", .key = 'i',
1109
.arg = "NAME",
1110
.doc = "Network interface that will be used to search for"
1111
" Mandos servers",
1112
.group = 1 },
1113
{ .name = "seckey", .key = 's',
1114
.arg = "FILE",
1115
.doc = "OpenPGP secret key file base name",
1116
.group = 1 },
1117
{ .name = "pubkey", .key = 'p',
1118
.arg = "FILE",
1119
.doc = "OpenPGP public key file base name",
1120
.group = 2 },
1121
{ .name = "dh-bits", .key = 129,
1122
.arg = "BITS",
1123
.doc = "Bit length of the prime number used in the"
1124
" Diffie-Hellman key exchange",
1125
.group = 2 },
1126
{ .name = "priority", .key = 130,
1127
.arg = "STRING",
1128
.doc = "GnuTLS priority string for the TLS handshake",
1129
.group = 1 },
1130
{ .name = "delay", .key = 131,
1131
.arg = "SECONDS",
1132
.doc = "Maximum delay to wait for interface startup",
1133
.group = 2 },
1134
{ .name = NULL }
1135
};
781
1136
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
1137
error_t parse_opt(int key, char *arg,
1138
struct argp_state *state){
1139
switch(key){
1140
case 128: /* --debug */
1141
debug = true;
1142
break;
1143
case 'c': /* --connect */
1144
connect_to = arg;
1145
break;
1146
case 'i': /* --interface */
1147
interface = arg;
1148
break;
1149
case 's': /* --seckey */
1150
seckey = arg;
1151
break;
1152
case 'p': /* --pubkey */
1153
pubkey = arg;
1154
break;
1155
case 129: /* --dh-bits */
1156
errno = 0;
1157
tmpmax = strtoimax(arg, &tmp, 10);
1158
if(errno != 0 or tmp == arg or *tmp != '\0'
1159
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1160
fprintf(stderr, "Bad number of DH bits\n");
1161
exit(EXIT_FAILURE);
1162
}
1163
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1164
break;
1165
case 130: /* --priority */
1166
mc.priority = arg;
1167
break;
1168
case 131: /* --delay */
1169
errno = 0;
1170
delay = strtof(arg, &tmp);
1171
if(errno != 0 or tmp == arg or *tmp != '\0'){
1172
fprintf(stderr, "Bad delay\n");
1173
exit(EXIT_FAILURE);
1174
}
1175
break;
1176
case ARGP_KEY_ARG:
1177
argp_usage(state);
1178
case ARGP_KEY_END:
1179
break;
1180
default:
1181
return ARGP_ERR_UNKNOWN;
859
1182
}
1183
return 0;
1184
}
1185
1186
struct argp argp = { .options = options, .parser = parse_opt,
1187
.args_doc = "",
1188
.doc = "Mandos client -- Get and decrypt"
1189
" passwords from a Mandos server" };
1190
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1191
if(ret == ARGP_ERR_UNKNOWN){
1192
fprintf(stderr, "Unknown error while parsing arguments\n");
1193
exitcode = EXIT_FAILURE;
1194
goto end;
1195
}
1196
}
1197
1198
if(not debug){
1199
avahi_set_log_function(empty_log);
1200
}
860
1201
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
1202
if(interface[0] == '\0'){
1203
struct dirent **direntries;
1204
ret = scandir(sys_class_net, &direntries, good_interface,
1205
alphasort);
1206
if(ret >= 1){
1207
/* Pick the first good interface */
1208
interface = strdup(direntries[0]->d_name);
1209
if(interface == NULL){
1210
perror("malloc");
1211
free(direntries);
868
1212
exitcode = EXIT_FAILURE;
869
1213
goto end;
870
1214
}
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
1215
free(direntries);
892
1216
} else {
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface); /* Spurious warning */
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
934
}
935
1217
free(direntries);
1218
fprintf(stderr, "Could not find a network interface\n");
1219
exitcode = EXIT_FAILURE;
1220
goto end;
1221
}
1222
}
1223
1224
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1225
from the signal handler */
1226
/* Initialize the pseudo-RNG for Avahi */
1227
srand((unsigned int) time(NULL));
1228
mc.simple_poll = avahi_simple_poll_new();
1229
if(mc.simple_poll == NULL){
1230
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1231
exitcode = EXIT_FAILURE;
1232
goto end;
1233
}
1234
1235
sigemptyset(&sigterm_action.sa_mask);
1236
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1237
if(ret == -1){
1238
perror("sigaddset");
1239
exitcode = EXIT_FAILURE;
1240
goto end;
1241
}
1242
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1243
if(ret == -1){
1244
perror("sigaddset");
1245
exitcode = EXIT_FAILURE;
1246
goto end;
1247
}
1248
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1249
if(ret == -1){
1250
perror("sigaddset");
1251
exitcode = EXIT_FAILURE;
1252
goto end;
1253
}
1254
/* Need to check if the handler is SIG_IGN before handling:
1255
| [[info:libc:Initial Signal Actions]] |
1256
| [[info:libc:Basic Signal Handling]] |
1257
*/
1258
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1259
if(ret == -1){
1260
perror("sigaction");
1261
return EXIT_FAILURE;
1262
}
1263
if(old_sigterm_action.sa_handler != SIG_IGN){
1264
ret = sigaction(SIGINT, &sigterm_action, NULL);
1265
if(ret == -1){
1266
perror("sigaction");
1267
exitcode = EXIT_FAILURE;
1268
goto end;
1269
}
1270
}
1271
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1272
if(ret == -1){
1273
perror("sigaction");
1274
return EXIT_FAILURE;
1275
}
1276
if(old_sigterm_action.sa_handler != SIG_IGN){
1277
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1278
if(ret == -1){
1279
perror("sigaction");
1280
exitcode = EXIT_FAILURE;
1281
goto end;
1282
}
1283
}
1284
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1285
if(ret == -1){
1286
perror("sigaction");
1287
return EXIT_FAILURE;
1288
}
1289
if(old_sigterm_action.sa_handler != SIG_IGN){
1290
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1291
if(ret == -1){
1292
perror("sigaction");
1293
exitcode = EXIT_FAILURE;
1294
goto end;
1295
}
1296
}
1297
1298
/* If the interface is down, bring it up */
1299
if(strcmp(interface, "none") != 0){
936
1300
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
1301
if(if_index == 0){
938
1302
fprintf(stderr, "No such interface: \"%s\"\n", interface);
939
exit(EXIT_FAILURE);
940
}
941
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
946
if(address == NULL){
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
*address = '\0';
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
961
if(ret < 0){
962
exitcode = EXIT_FAILURE;
963
} else {
964
exitcode = EXIT_SUCCESS;
965
}
966
goto end;
967
}
968
969
if (not debug){
970
avahi_set_log_function(empty_log);
971
}
972
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1013
AVAHI_PROTO_INET6,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1016
if (sb == NULL) {
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
1023
/* Run the main loop */
1024
1025
if (debug){
1026
fprintf(stderr, "Starting Avahi loop search\n");
1027
}
1028
1029
avahi_simple_poll_loop(mc.simple_poll);
1030
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Re-raise priviliges */
1312
errno = 0;
1313
ret = seteuid(0);
1314
if(ret == -1){
1315
perror("seteuid");
1316
}
1317
1318
#ifdef __linux__
1319
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1320
messages to mess up the prompt */
1321
ret = klogctl(8, NULL, 5);
1322
bool restore_loglevel = true;
1323
if(ret == -1){
1324
restore_loglevel = false;
1325
perror("klogctl");
1326
}
1327
#endif /* __linux__ */
1328
1329
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1330
if(sd < 0){
1331
perror("socket");
1332
exitcode = EXIT_FAILURE;
1333
#ifdef __linux__
1334
if(restore_loglevel){
1335
ret = klogctl(7, NULL, 0);
1336
if(ret == -1){
1337
perror("klogctl");
1338
}
1339
}
1340
#endif /* __linux__ */
1341
/* Lower privileges */
1342
errno = 0;
1343
ret = seteuid(uid);
1344
if(ret == -1){
1345
perror("seteuid");
1346
}
1347
goto end;
1348
}
1349
strcpy(network.ifr_name, interface);
1350
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1351
if(ret == -1){
1352
perror("ioctl SIOCGIFFLAGS");
1353
#ifdef __linux__
1354
if(restore_loglevel){
1355
ret = klogctl(7, NULL, 0);
1356
if(ret == -1){
1357
perror("klogctl");
1358
}
1359
}
1360
#endif /* __linux__ */
1361
exitcode = EXIT_FAILURE;
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
if((network.ifr_flags & IFF_UP) == 0){
1371
network.ifr_flags |= IFF_UP;
1372
take_down_interface = true;
1373
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1374
if(ret == -1){
1375
take_down_interface = false;
1376
perror("ioctl SIOCSIFFLAGS");
1377
exitcode = EXIT_FAILURE;
1378
#ifdef __linux__
1379
if(restore_loglevel){
1380
ret = klogctl(7, NULL, 0);
1381
if(ret == -1){
1382
perror("klogctl");
1383
}
1384
}
1385
#endif /* __linux__ */
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
}
1395
/* sleep checking until interface is running */
1396
for(int i=0; i < delay * 4; i++){
1397
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1398
if(ret == -1){
1399
perror("ioctl SIOCGIFFLAGS");
1400
} else if(network.ifr_flags & IFF_RUNNING){
1401
break;
1402
}
1403
struct timespec sleeptime = { .tv_nsec = 250000000 };
1404
ret = nanosleep(&sleeptime, NULL);
1405
if(ret == -1 and errno != EINTR){
1406
perror("nanosleep");
1407
}
1408
}
1409
if(not take_down_interface){
1410
/* We won't need the socket anymore */
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1412
if(ret == -1){
1413
perror("close");
1414
}
1415
}
1416
#ifdef __linux__
1417
if(restore_loglevel){
1418
/* Restores kernel loglevel to default */
1419
ret = klogctl(7, NULL, 0);
1420
if(ret == -1){
1421
perror("klogctl");
1422
}
1423
}
1424
#endif /* __linux__ */
1425
/* Lower privileges */
1426
errno = 0;
1427
if(take_down_interface){
1428
/* Lower privileges */
1429
ret = seteuid(uid);
1430
if(ret == -1){
1431
perror("seteuid");
1432
}
1433
} else {
1434
/* Lower privileges permanently */
1435
ret = setuid(uid);
1436
if(ret == -1){
1437
perror("setuid");
1438
}
1439
}
1440
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
ret = init_gnutls_global(pubkey, seckey);
1447
if(ret == -1){
1448
fprintf(stderr, "init_gnutls_global failed\n");
1449
exitcode = EXIT_FAILURE;
1450
goto end;
1451
} else {
1452
gnutls_initialized = true;
1453
}
1454
1455
if(quit_now){
1456
goto end;
1457
}
1458
1459
tempdir_created = true;
1460
if(mkdtemp(tempdir) == NULL){
1461
tempdir_created = false;
1462
perror("mkdtemp");
1463
goto end;
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
if(not init_gpgme(pubkey, seckey, tempdir)){
1471
fprintf(stderr, "init_gpgme failed\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
} else {
1475
gpgme_initialized = true;
1476
}
1477
1478
if(quit_now){
1479
goto end;
1480
}
1481
1482
if(connect_to != NULL){
1483
/* Connect directly, do not use Zeroconf */
1484
/* (Mainly meant for debugging) */
1485
char *address = strrchr(connect_to, ':');
1486
if(address == NULL){
1487
fprintf(stderr, "No colon in address\n");
1488
exitcode = EXIT_FAILURE;
1489
goto end;
1490
}
1491
1492
if(quit_now){
1493
goto end;
1494
}
1495
1496
uint16_t port;
1497
errno = 0;
1498
tmpmax = strtoimax(address+1, &tmp, 10);
1499
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1500
or tmpmax != (uint16_t)tmpmax){
1501
fprintf(stderr, "Bad port number\n");
1502
exitcode = EXIT_FAILURE;
1503
goto end;
1504
}
1505
1506
if(quit_now){
1507
goto end;
1508
}
1509
1510
port = (uint16_t)tmpmax;
1511
*address = '\0';
1512
address = connect_to;
1513
/* Colon in address indicates IPv6 */
1514
int af;
1515
if(strchr(address, ':') != NULL){
1516
af = AF_INET6;
1517
} else {
1518
af = AF_INET;
1519
}
1520
1521
if(quit_now){
1522
goto end;
1523
}
1524
1525
ret = start_mandos_communication(address, port, if_index, af);
1526
if(ret < 0){
1527
exitcode = EXIT_FAILURE;
1528
} else {
1529
exitcode = EXIT_SUCCESS;
1530
}
1531
goto end;
1532
}
1533
1534
if(quit_now){
1535
goto end;
1536
}
1537
1538
{
1539
AvahiServerConfig config;
1540
/* Do not publish any local Zeroconf records */
1541
avahi_server_config_init(&config);
1542
config.publish_hinfo = 0;
1543
config.publish_addresses = 0;
1544
config.publish_workstation = 0;
1545
config.publish_domain = 0;
1546
1547
/* Allocate a new server */
1548
mc.server = avahi_server_new(avahi_simple_poll_get
1549
(mc.simple_poll), &config, NULL,
1550
NULL, &error);
1551
1552
/* Free the Avahi configuration data */
1553
avahi_server_config_free(&config);
1554
}
1555
1556
/* Check if creating the Avahi server object succeeded */
1557
if(mc.server == NULL){
1558
fprintf(stderr, "Failed to create Avahi server: %s\n",
1559
avahi_strerror(error));
1560
exitcode = EXIT_FAILURE;
1561
goto end;
1562
}
1563
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
/* Create the Avahi service browser */
1569
sb = avahi_s_service_browser_new(mc.server, if_index,
1570
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1571
NULL, 0, browse_callback, NULL);
1572
if(sb == NULL){
1573
fprintf(stderr, "Failed to create service browser: %s\n",
1574
avahi_strerror(avahi_server_errno(mc.server)));
1575
exitcode = EXIT_FAILURE;
1576
goto end;
1577
}
1578
1579
if(quit_now){
1580
goto end;
1581
}
1582
1583
/* Run the main loop */
1584
1585
if(debug){
1586
fprintf(stderr, "Starting Avahi loop search\n");
1587
}
1588
1589
avahi_simple_poll_loop(mc.simple_poll);
1590
1031
1591
end:
1032
1033
if (debug){
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1035
}
1036
1037
/* Cleanup things */
1038
if (sb != NULL)
1039
avahi_s_service_browser_free(sb);
1040
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1043
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfile);
1047
free(seckeyfile);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
1054
return exitcode;
1592
1593
if(debug){
1594
fprintf(stderr, "%s exiting\n", argv[0]);
1595
}
1596
1597
/* Cleanup things */
1598
if(sb != NULL)
1599
avahi_s_service_browser_free(sb);
1600
1601
if(mc.server != NULL)
1602
avahi_server_free(mc.server);
1603
1604
if(mc.simple_poll != NULL)
1605
avahi_simple_poll_free(mc.simple_poll);
1606
1607
if(gnutls_initialized){
1608
gnutls_certificate_free_credentials(mc.cred);
1609
gnutls_global_deinit();
1610
gnutls_dh_params_deinit(mc.dh_params);
1611
}
1612
1613
if(gpgme_initialized){
1614
gpgme_release(mc.ctx);
1615
}
1616
1617
/* Take down the network interface */
1618
if(take_down_interface){
1619
/* Re-raise priviliges */
1620
errno = 0;
1621
ret = seteuid(0);
1622
if(ret == -1){
1623
perror("seteuid");
1624
}
1625
if(geteuid() == 0){
1626
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1627
if(ret == -1){
1628
perror("ioctl SIOCGIFFLAGS");
1629
} else if(network.ifr_flags & IFF_UP) {
1630
network.ifr_flags &= ~IFF_UP; /* clear flag */
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
perror("ioctl SIOCSIFFLAGS");
1634
}
1635
}
1636
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1637
if(ret == -1){
1638
perror("close");
1639
}
1640
/* Lower privileges permanently */
1641
errno = 0;
1642
ret = setuid(uid);
1643
if(ret == -1){
1644
perror("setuid");
1645
}
1646
}
1647
}
1648
1649
/* Removes the temp directory used by GPGME */
1650
if(tempdir_created){
1651
DIR *d;
1652
struct dirent *direntry;
1653
d = opendir(tempdir);
1654
if(d == NULL){
1655
if(errno != ENOENT){
1656
perror("opendir");
1657
}
1658
} else {
1659
while(true){
1660
direntry = readdir(d);
1661
if(direntry == NULL){
1662
break;
1663
}
1664
/* Skip "." and ".." */
1665
if(direntry->d_name[0] == '.'
1666
and (direntry->d_name[1] == '\0'
1667
or (direntry->d_name[1] == '.'
1668
and direntry->d_name[2] == '\0'))){
1669
continue;
1670
}
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror("asprintf");
1676
continue;
1677
}
1678
ret = remove(fullname);
1679
if(ret == -1){
1680
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1681
strerror(errno));
1682
}
1683
free(fullname);
1684
}
1685
closedir(d);
1686
}
1687
ret = rmdir(tempdir);
1688
if(ret == -1 and errno != ENOENT){
1689
perror("rmdir");
1690
}
1691
}
1692
1693
if(quit_now){
1694
sigemptyset(&old_sigterm_action.sa_mask);
1695
old_sigterm_action.sa_handler = SIG_DFL;
1696
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1697
&old_sigterm_action,
1698
NULL));
1699
if(ret == -1){
1700
perror("sigaction");
1701
}
1702
do {
1703
ret = raise(signal_received);
1704
} while(ret != 0 and errno == EINTR);
1705
if(ret != 0){
1706
perror("raise");
1707
abort();
1708
}
1709
TEMP_FAILURE_RETRY(pause());
1710
}
1711
1712
return exitcode;
1055
1713
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0