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- Committer: Teddy Hogeborn
- Date: 2008-08-03 03:33:56 UTC
- Revision ID: teddy@fukt.bsnet.se-20080803033356-6aemgj0g0hoz91ow
* plugins.d/mandosclient.c (pgp_packet_decrypt): Renamed variables.
On debug, show
decrypted plaintext
in hexadecimal. Free
the GPGME data
buffers even on
errors.
On debug, show
decrypted plaintext
in hexadecimal. Free
the GPGME data
buffers even on
errors.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
34
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
41
SIOCSIFFLAGS */
67
42
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
91
92
/* Avahi */
93
/* All Avahi types, constants and functions
94
Avahi*, avahi_*,
95
AVAHI_* */
43
SIOCSIFFLAGS */
44
96
45
#include <avahi-core/core.h>
97
46
#include <avahi-core/lookup.h>
98
47
#include <avahi-core/log.h>
100
49
#include <avahi-common/malloc.h>
101
50
#include <avahi-common/error.h>
102
51
103
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
106
gnutls_*
107
init_gnutls_session(),
108
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
112
113
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
116
gpgme_*
117
GPGME_PROTOCOL_OpenPGP,
118
GPG_ERR_NO_* */
52
//mandos client part
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
58
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
66
// gpgme
67
#include <errno.h> /* perror() */
68
#include <gpgme.h>
69
70
// getopt_long
71
#include <getopt.h>
119
72
120
73
#define BUFFER_SIZE 256
121
74
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
75
static const char *keydir = "/conf/conf.d/mandos";
76
static const char *pubkeyfile = "pubkey.txt";
77
static const char *seckeyfile = "seckey.txt";
125
78
126
79
bool debug = false;
127
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
80
133
/* Used for passing in values through the Avahi callback functions */
81
/* Used for passing in values through all the callback functions */
134
82
typedef struct {
135
83
AvahiSimplePoll *simple_poll;
136
84
AvahiServer *server;
137
85
gnutls_certificate_credentials_t cred;
138
86
unsigned int dh_bits;
139
gnutls_dh_params_t dh_params;
140
87
const char *priority;
88
} mandos_context;
89
90
/*
91
* Decrypt OpenPGP data using keyrings in HOMEDIR.
92
* Returns -1 on error
93
*/
94
static ssize_t pgp_packet_decrypt (const char *cryptotext,
95
size_t crypto_size,
96
char **plaintext,
97
const char *homedir){
98
gpgme_data_t dh_crypto, dh_plain;
141
99
gpgme_ctx_t ctx;
142
} mandos_context;
143
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
155
* "buffer_length" is how much is already used.
156
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
162
return 0;
163
}
164
buffer_capacity += BUFFER_SIZE;
165
}
166
return buffer_capacity;
167
}
168
169
/*
170
* Initialize GPGME.
171
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
174
100
gpgme_error_t rc;
101
ssize_t ret;
102
ssize_t plaintext_capacity = 0;
103
ssize_t plaintext_length = 0;
175
104
gpgme_engine_info_t engine_info;
176
105
177
178
/*
179
* Helper function to insert pub and seckey to the engine keyring.
180
*/
181
bool import_key(const char *filename){
182
int ret;
183
int fd;
184
gpgme_data_t pgp_data;
185
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
if(fd == -1){
188
perror("open");
189
return false;
190
}
191
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
rc = gpgme_op_import(mc.ctx, pgp_data);
200
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
203
return false;
204
}
205
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
if(ret == -1){
208
perror("close");
209
}
210
gpgme_data_release(pgp_data);
211
return true;
212
}
213
214
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
106
if (debug){
107
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
216
108
}
217
109
218
110
/* Init GPGME */
219
111
gpgme_check_version(NULL);
220
112
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
if(rc != GPG_ERR_NO_ERROR){
113
if (rc != GPG_ERR_NO_ERROR){
222
114
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
115
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
116
return -1;
225
117
}
226
118
227
/* Set GPGME home directory for the OpenPGP engine only */
228
rc = gpgme_get_engine_info(&engine_info);
229
if(rc != GPG_ERR_NO_ERROR){
119
/* Set GPGME home directory for the OpenPGP engine only */
120
rc = gpgme_get_engine_info (&engine_info);
121
if (rc != GPG_ERR_NO_ERROR){
230
122
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
123
gpgme_strsource(rc), gpgme_strerror(rc));
232
return false;
124
return -1;
233
125
}
234
126
while(engine_info != NULL){
235
127
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
236
128
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
237
engine_info->file_name, tempdir);
129
engine_info->file_name, homedir);
238
130
break;
239
131
}
240
132
engine_info = engine_info->next;
241
133
}
242
134
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
244
return false;
245
}
246
247
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
249
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
252
return false;
253
}
254
255
if(not import_key(pubkey) or not import_key(seckey)){
256
return false;
257
}
258
259
return true;
260
}
261
262
/*
263
* Decrypt OpenPGP data.
264
* Returns -1 on error
265
*/
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
size_t crypto_size,
268
char **plaintext){
269
gpgme_data_t dh_crypto, dh_plain;
270
gpgme_error_t rc;
271
ssize_t ret;
272
size_t plaintext_capacity = 0;
273
ssize_t plaintext_length = 0;
274
275
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
135
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
136
return -1;
277
137
}
278
138
279
139
/* Create new GPGME data buffer from memory cryptotext */
280
140
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
141
0);
282
if(rc != GPG_ERR_NO_ERROR){
142
if (rc != GPG_ERR_NO_ERROR){
283
143
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
144
gpgme_strsource(rc), gpgme_strerror(rc));
285
145
return -1;
287
147
288
148
/* Create new empty GPGME data buffer for the plaintext */
289
149
rc = gpgme_data_new(&dh_plain);
290
if(rc != GPG_ERR_NO_ERROR){
150
if (rc != GPG_ERR_NO_ERROR){
291
151
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
152
gpgme_strsource(rc), gpgme_strerror(rc));
293
153
gpgme_data_release(dh_crypto);
294
154
return -1;
295
155
}
296
156
157
/* Create new GPGME "context" */
158
rc = gpgme_new(&ctx);
159
if (rc != GPG_ERR_NO_ERROR){
160
fprintf(stderr, "bad gpgme_new: %s: %s\n",
161
gpgme_strsource(rc), gpgme_strerror(rc));
162
plaintext_length = -1;
163
goto decrypt_end;
164
}
165
297
166
/* Decrypt data from the cryptotext data buffer to the plaintext
298
167
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
168
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
169
if (rc != GPG_ERR_NO_ERROR){
301
170
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
171
gpgme_strsource(rc), gpgme_strerror(rc));
303
172
plaintext_length = -1;
304
if(debug){
305
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
307
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
309
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
314
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
316
}
317
gpgme_recipient_t recipient;
318
recipient = result->recipients;
173
goto decrypt_end;
174
}
175
176
if(debug){
177
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
178
}
179
180
if (debug){
181
gpgme_decrypt_result_t result;
182
result = gpgme_op_decrypt_result(ctx);
183
if (result == NULL){
184
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
185
} else {
186
fprintf(stderr, "Unsupported algorithm: %s\n",
187
result->unsupported_algorithm);
188
fprintf(stderr, "Wrong key usage: %d\n",
189
result->wrong_key_usage);
190
if(result->file_name != NULL){
191
fprintf(stderr, "File name: %s\n", result->file_name);
192
}
193
gpgme_recipient_t recipient;
194
recipient = result->recipients;
195
if(recipient){
319
196
while(recipient != NULL){
320
197
fprintf(stderr, "Public key algorithm: %s\n",
321
198
gpgme_pubkey_algo_name(recipient->pubkey_algo));
327
204
}
328
205
}
329
206
}
330
goto decrypt_end;
331
}
332
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
335
207
}
336
208
337
209
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
210
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
211
perror("pgpme_data_seek");
340
212
plaintext_length = -1;
341
213
goto decrypt_end;
342
214
}
343
215
344
216
*plaintext = NULL;
345
217
while(true){
346
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
218
if (plaintext_length + BUFFER_SIZE > plaintext_capacity){
219
*plaintext = realloc(*plaintext,
220
(unsigned int)plaintext_capacity
221
+ BUFFER_SIZE);
222
if (*plaintext == NULL){
223
perror("realloc");
351
224
plaintext_length = -1;
352
225
goto decrypt_end;
226
}
227
plaintext_capacity += BUFFER_SIZE;
353
228
}
354
229
355
230
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
231
BUFFER_SIZE);
357
232
/* Print the data, if any */
358
if(ret == 0){
233
if (ret == 0){
359
234
/* EOF */
360
235
break;
361
236
}
366
241
}
367
242
plaintext_length += ret;
368
243
}
369
244
370
245
if(debug){
371
246
fprintf(stderr, "Decrypted password is: ");
372
for(ssize_t i = 0; i < plaintext_length; i++){
247
for(size_t i = 0; i < plaintext_length; i++){
373
248
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
249
}
375
250
fprintf(stderr, "\n");
385
260
return plaintext_length;
386
261
}
387
262
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
263
static const char * safer_gnutls_strerror (int value) {
264
const char *ret = gnutls_strerror (value);
265
if (ret == NULL)
392
266
ret = "(unknown)";
393
267
return ret;
394
268
}
395
269
396
/* GnuTLS log function callback */
397
270
static void debuggnutls(__attribute__((unused)) int level,
398
271
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
272
fprintf(stderr, "%s", string);
400
273
}
401
274
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
275
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
276
gnutls_dh_params_t *dh_params){
277
const char *err;
404
278
int ret;
405
279
406
280
if(debug){
407
281
fprintf(stderr, "Initializing GnuTLS\n");
408
282
}
409
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
283
284
if ((ret = gnutls_global_init ())
285
!= GNUTLS_E_SUCCESS) {
286
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
414
287
return -1;
415
288
}
416
289
417
if(debug){
418
/* "Use a log level over 10 to enable all debugging options."
419
* - GnuTLS manual
420
*/
290
if (debug){
421
291
gnutls_global_set_log_level(11);
422
292
gnutls_global_set_log_function(debuggnutls);
423
293
}
424
294
425
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
295
/* openpgp credentials */
296
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
297
!= GNUTLS_E_SUCCESS) {
298
fprintf (stderr, "memory error: %s\n",
299
safer_gnutls_strerror(ret));
434
300
return -1;
435
301
}
436
302
437
303
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
304
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
305
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
306
seckeyfile);
441
307
}
442
308
443
309
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
452
goto globalfail;
453
}
454
455
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
460
goto globalfail;
461
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
466
goto globalfail;
467
}
468
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
470
471
return 0;
472
473
globalfail:
474
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
478
return -1;
479
}
480
481
static int init_gnutls_session(gnutls_session_t *session){
482
int ret;
483
/* GnuTLS session creation */
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
310
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
311
if (ret != GNUTLS_E_SUCCESS) {
312
fprintf
313
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
314
" '%s')\n",
315
ret, pubkeyfile, seckeyfile);
316
fprintf(stdout, "The Error is: %s\n",
317
safer_gnutls_strerror(ret));
318
return -1;
319
}
320
321
//GnuTLS server initialization
322
if ((ret = gnutls_dh_params_init(dh_params))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf (stderr, "Error in dh parameter initialization: %s\n",
325
safer_gnutls_strerror(ret));
326
return -1;
327
}
328
329
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf (stderr, "Error in prime generation: %s\n",
332
safer_gnutls_strerror(ret));
333
return -1;
334
}
335
336
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
337
338
// GnuTLS session creation
339
if ((ret = gnutls_init(session, GNUTLS_SERVER))
340
!= GNUTLS_E_SUCCESS){
491
341
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
342
safer_gnutls_strerror(ret));
493
343
}
494
344
495
{
496
const char *err;
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
509
return -1;
510
}
345
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
346
!= GNUTLS_E_SUCCESS) {
347
fprintf(stderr, "Syntax error at: %s\n", err);
348
fprintf(stderr, "GnuTLS error: %s\n",
349
safer_gnutls_strerror(ret));
350
return -1;
511
351
}
512
352
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
353
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
354
mc->cred))
355
!= GNUTLS_E_SUCCESS) {
356
fprintf(stderr, "Error setting a credentials set: %s\n",
523
357
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
525
358
return -1;
526
359
}
527
360
528
361
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
362
gnutls_certificate_server_set_request (*session,
363
GNUTLS_CERT_IGNORE);
530
364
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
365
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
532
366
533
367
return 0;
534
368
}
535
369
536
/* Avahi log function callback */
537
370
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
538
371
__attribute__((unused)) const char *txt){}
539
372
540
/* Called when a Mandos server is found */
541
373
static int start_mandos_communication(const char *ip, uint16_t port,
542
374
AvahiIfIndex if_index,
543
int af){
544
int ret, tcp_sd = -1;
545
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
375
mandos_context *mc){
376
int ret, tcp_sd;
377
struct sockaddr_in6 to;
550
378
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
379
char *decrypted_buffer;
552
380
size_t buffer_length = 0;
553
381
size_t buffer_capacity = 0;
554
size_t written;
555
int retval = -1;
382
ssize_t decrypted_buffer_size;
383
size_t written = 0;
384
int retval = 0;
385
char interface[IF_NAMESIZE];
556
386
gnutls_session_t session;
557
int pf; /* Protocol family */
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
switch(af){
567
case AF_INET6:
568
pf = PF_INET6;
569
break;
570
case AF_INET:
571
pf = PF_INET;
572
break;
573
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
return -1;
577
}
578
579
ret = init_gnutls_session(&session);
580
if(ret != 0){
581
return -1;
582
}
387
gnutls_dh_params_t dh_params;
583
388
584
389
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
390
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
391
ip, port);
587
392
}
588
393
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
394
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
395
if(tcp_sd < 0) {
592
396
perror("socket");
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
600
}
601
602
memset(&to, 0, sizeof(to));
603
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
609
}
610
if(ret < 0 ){
611
int e = errno;
397
return -1;
398
}
399
400
if(debug){
401
if(if_indextoname((unsigned int)if_index, interface) == NULL){
402
perror("if_indextoname");
403
return -1;
404
}
405
fprintf(stderr, "Binding to interface %s\n", interface);
406
}
407
408
memset(&to,0,sizeof(to)); /* Spurious warning */
409
to.sin6_family = AF_INET6;
410
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
411
if (ret < 0 ){
612
412
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
413
return -1;
615
414
}
616
415
if(ret == 0){
617
int e = errno;
618
416
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
621
}
622
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
635
}
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
638
}
639
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
643
}
417
return -1;
418
}
419
to.sin6_port = htons(port); /* Spurious warning */
644
420
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
421
to.sin6_scope_id = (uint32_t)if_index;
649
422
650
423
if(debug){
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
655
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
658
}
659
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
662
}
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
424
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
425
char addrstr[INET6_ADDRSTRLEN] = "";
426
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
427
sizeof(addrstr)) == NULL){
674
428
perror("inet_ntop");
675
429
} else {
676
430
if(strcmp(addrstr, ip) != 0){
679
433
}
680
434
}
681
435
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
int e = errno;
436
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
437
if (ret < 0){
694
438
perror("connect");
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
702
}
703
704
const char *out = mandos_protocol_version;
705
written = 0;
706
while(true){
707
size_t out_size = strlen(out);
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
709
out_size - written));
710
if(ret == -1){
711
int e = errno;
712
perror("write");
713
errno = e;
714
goto mandos_end;
715
}
716
written += (size_t)ret;
717
if(written < out_size){
718
continue;
719
} else {
720
if(out == mandos_protocol_version){
721
written = 0;
722
out = "\r\n";
723
} else {
724
break;
725
}
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
732
}
439
return -1;
440
}
441
442
ret = initgnutls (mc, &session, &dh_params);
443
if (ret != 0){
444
retval = -1;
445
return -1;
446
}
447
448
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
733
449
734
450
if(debug){
735
451
fprintf(stderr, "Establishing TLS session with %s\n", ip);
736
452
}
737
453
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
744
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
751
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
756
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
757
758
if(ret != GNUTLS_E_SUCCESS){
454
ret = gnutls_handshake (session);
455
456
if (ret != GNUTLS_E_SUCCESS){
759
457
if(debug){
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
761
gnutls_perror(ret);
458
fprintf(stderr, "\n*** Handshake failed ***\n");
459
gnutls_perror (ret);
762
460
}
763
errno = EPROTO;
764
goto mandos_end;
461
retval = -1;
462
goto exit;
765
463
}
766
464
767
/* Read OpenPGP packet that contains the wanted password */
465
//Retrieve OpenPGP packet that contains the wanted password
768
466
769
467
if(debug){
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
468
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
771
469
ip);
772
470
}
773
471
774
472
while(true){
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
buffer_capacity = incbuffer(&buffer, buffer_length,
782
buffer_capacity);
783
if(buffer_capacity == 0){
784
int e = errno;
785
perror("incbuffer");
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
792
goto mandos_end;
793
}
794
795
sret = gnutls_record_recv(session, buffer+buffer_length,
796
BUFFER_SIZE);
797
if(sret == 0){
473
if (buffer_length + BUFFER_SIZE > buffer_capacity){
474
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
475
if (buffer == NULL){
476
perror("realloc");
477
goto exit;
478
}
479
buffer_capacity += BUFFER_SIZE;
480
}
481
482
ret = gnutls_record_recv(session, buffer+buffer_length,
483
BUFFER_SIZE);
484
if (ret == 0){
798
485
break;
799
486
}
800
if(sret < 0){
801
switch(sret){
487
if (ret < 0){
488
switch(ret){
802
489
case GNUTLS_E_INTERRUPTED:
803
490
case GNUTLS_E_AGAIN:
804
491
break;
805
492
case GNUTLS_E_REHANDSHAKE:
806
do {
807
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
if(ret < 0){
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
816
gnutls_perror(ret);
817
errno = EPROTO;
818
goto mandos_end;
493
ret = gnutls_handshake (session);
494
if (ret < 0){
495
fprintf(stderr, "\n*** Handshake failed ***\n");
496
gnutls_perror (ret);
497
retval = -1;
498
goto exit;
819
499
}
820
500
break;
821
501
default:
822
502
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
826
goto mandos_end;
503
" encrypted session with mandos server\n");
504
retval = -1;
505
gnutls_bye (session, GNUTLS_SHUT_RDWR);
506
goto exit;
827
507
}
828
508
} else {
829
buffer_length += (size_t) sret;
830
}
831
}
832
833
if(debug){
834
fprintf(stderr, "Closing TLS session\n");
835
}
836
837
if(quit_now){
838
errno = EINTR;
839
goto mandos_end;
840
}
841
842
do {
843
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
849
850
if(buffer_length > 0){
851
ssize_t decrypted_buffer_size;
509
buffer_length += (size_t) ret;
510
}
511
}
512
513
if (buffer_length > 0){
852
514
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
515
buffer_length,
854
&decrypted_buffer);
855
if(decrypted_buffer_size >= 0){
856
857
written = 0;
516
&decrypted_buffer,
517
keydir);
518
if (decrypted_buffer_size >= 0){
858
519
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
864
ret = (int)fwrite(decrypted_buffer + written, 1,
865
(size_t)decrypted_buffer_size - written,
866
stdout);
520
ret = (int)fwrite (decrypted_buffer + written, 1,
521
(size_t)decrypted_buffer_size - written,
522
stdout);
867
523
if(ret == 0 and ferror(stdout)){
868
int e = errno;
869
524
if(debug){
870
525
fprintf(stderr, "Error writing encrypted data: %s\n",
871
526
strerror(errno));
872
527
}
873
errno = e;
874
goto mandos_end;
528
retval = -1;
529
break;
875
530
}
876
531
written += (size_t)ret;
877
532
}
878
retval = 0;
879
}
880
}
881
882
/* Shutdown procedure */
883
884
mandos_end:
885
{
886
int e = errno;
887
free(decrypted_buffer);
888
free(buffer);
889
if(tcp_sd >= 0){
890
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
891
}
892
if(ret == -1){
893
if(e == 0){
894
e = errno;
895
}
896
perror("close");
897
}
898
gnutls_deinit(session);
899
if(quit_now){
900
e = EINTR;
533
free(decrypted_buffer);
534
} else {
901
535
retval = -1;
902
536
}
903
errno = e;
904
}
537
}
538
539
//shutdown procedure
540
541
if(debug){
542
fprintf(stderr, "Closing TLS session\n");
543
}
544
545
free(buffer);
546
gnutls_bye (session, GNUTLS_SHUT_RDWR);
547
exit:
548
close(tcp_sd);
549
gnutls_deinit (session);
550
gnutls_certificate_free_credentials (mc->cred);
551
gnutls_global_deinit ();
905
552
return retval;
906
553
}
907
554
908
555
static void resolve_callback(AvahiSServiceResolver *r,
909
556
AvahiIfIndex interface,
910
AvahiProtocol proto,
557
AVAHI_GCC_UNUSED AvahiProtocol protocol,
911
558
AvahiResolverEvent event,
912
559
const char *name,
913
560
const char *type,
918
565
AVAHI_GCC_UNUSED AvahiStringList *txt,
919
566
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
567
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(r);
568
void* userdata) {
569
mandos_context *mc = userdata;
570
assert(r); /* Spurious warning */
923
571
924
572
/* Called whenever a service has been resolved successfully or
925
573
timed out */
926
574
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
575
switch (event) {
932
576
default:
933
577
case AVAHI_RESOLVER_FAILURE:
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
578
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
579
" type '%s' in domain '%s': %s\n", name, type, domain,
580
avahi_strerror(avahi_server_errno(mc->server)));
937
581
break;
938
582
939
583
case AVAHI_RESOLVER_FOUND:
941
585
char ip[AVAHI_ADDRESS_STR_MAX];
942
586
avahi_address_snprint(ip, sizeof(ip), address);
943
587
if(debug){
944
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
ip, (intmax_t)interface, port);
588
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
589
" port %d\n", name, host_name, ip, port);
947
590
}
948
int ret = start_mandos_communication(ip, port, interface,
949
avahi_proto_to_af(proto));
950
if(ret == 0){
951
avahi_simple_poll_quit(mc.simple_poll);
591
int ret = start_mandos_communication(ip, port, interface, mc);
592
if (ret == 0){
593
exit(EXIT_SUCCESS);
952
594
}
953
595
}
954
596
}
955
597
avahi_s_service_resolver_free(r);
956
598
}
957
599
958
static void browse_callback(AvahiSServiceBrowser *b,
959
AvahiIfIndex interface,
960
AvahiProtocol protocol,
961
AvahiBrowserEvent event,
962
const char *name,
963
const char *type,
964
const char *domain,
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
966
flags,
967
AVAHI_GCC_UNUSED void* userdata){
968
assert(b);
600
static void browse_callback( AvahiSServiceBrowser *b,
601
AvahiIfIndex interface,
602
AvahiProtocol protocol,
603
AvahiBrowserEvent event,
604
const char *name,
605
const char *type,
606
const char *domain,
607
AVAHI_GCC_UNUSED AvahiLookupResultFlags
608
flags,
609
void* userdata) {
610
mandos_context *mc = userdata;
611
assert(b); /* Spurious warning */
969
612
970
613
/* Called whenever a new services becomes available on the LAN or
971
614
is removed from the LAN */
972
615
973
if(quit_now){
974
return;
975
}
976
977
switch(event){
616
switch (event) {
978
617
default:
979
618
case AVAHI_BROWSER_FAILURE:
980
619
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
620
fprintf(stderr, "(Browser) %s\n",
621
avahi_strerror(avahi_server_errno(mc->server)));
622
avahi_simple_poll_quit(mc->simple_poll);
984
623
return;
985
624
986
625
case AVAHI_BROWSER_NEW:
987
/* We ignore the returned Avahi resolver object. In the callback
988
function we free it. If the Avahi server is terminated before
989
the callback function is called the Avahi server will free the
990
resolver for us. */
626
/* We ignore the returned resolver object. In the callback
627
function we free it. If the server is terminated before
628
the callback function is called the server will free
629
the resolver for us. */
991
630
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
631
if (!(avahi_s_service_resolver_new(mc->server, interface,
632
protocol, name, type, domain,
633
AVAHI_PROTO_INET6, 0,
634
resolve_callback, mc)))
635
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
636
avahi_strerror(avahi_server_errno(mc->server)));
997
637
break;
998
638
999
639
case AVAHI_BROWSER_REMOVE:
1001
641
1002
642
case AVAHI_BROWSER_ALL_FOR_NOW:
1003
643
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1004
if(debug){
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1006
}
1007
644
break;
1008
645
}
1009
646
}
1010
647
1011
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
1013
if(quit_now){
1014
return;
1015
}
1016
quit_now = 1;
1017
signal_received = sig;
1018
int old_errno = errno;
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1021
}
1022
errno = old_errno;
1023
}
1024
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1118
}
1119
1120
int main(int argc, char *argv[]){
1121
AvahiSServiceBrowser *sb = NULL;
1122
int error;
1123
int ret;
1124
intmax_t tmpmax;
1125
char *tmp;
1126
int exitcode = EXIT_SUCCESS;
1127
const char *interface = "";
1128
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
1131
uid_t uid;
1132
gid_t gid;
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1134
bool tempdir_created = false;
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1136
const char *seckey = PATHDIR "/" SECKEY;
1137
const char *pubkey = PATHDIR "/" PUBKEY;
1138
1139
bool gnutls_initialized = false;
1140
bool gpgme_initialized = false;
1141
float delay = 2.5f;
1142
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1145
1146
uid = getuid();
1147
gid = getgid();
1148
1149
/* Lower any group privileges we might have, just to be safe */
1150
errno = 0;
1151
ret = setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
/* Lower user privileges (temporarily) */
1157
errno = 0;
1158
ret = seteuid(uid);
1159
if(ret == -1){
1160
perror("seteuid");
1161
}
1162
1163
if(quit_now){
1164
goto end;
1165
}
1166
1167
{
1168
struct argp_option options[] = {
1169
{ .name = "debug", .key = 128,
1170
.doc = "Debug mode", .group = 3 },
1171
{ .name = "connect", .key = 'c',
1172
.arg = "ADDRESS:PORT",
1173
.doc = "Connect directly to a specific Mandos server",
1174
.group = 1 },
1175
{ .name = "interface", .key = 'i',
1176
.arg = "NAME",
1177
.doc = "Network interface that will be used to search for"
1178
" Mandos servers",
1179
.group = 1 },
1180
{ .name = "seckey", .key = 's',
1181
.arg = "FILE",
1182
.doc = "OpenPGP secret key file base name",
1183
.group = 1 },
1184
{ .name = "pubkey", .key = 'p',
1185
.arg = "FILE",
1186
.doc = "OpenPGP public key file base name",
1187
.group = 2 },
1188
{ .name = "dh-bits", .key = 129,
1189
.arg = "BITS",
1190
.doc = "Bit length of the prime number used in the"
1191
" Diffie-Hellman key exchange",
1192
.group = 2 },
1193
{ .name = "priority", .key = 130,
1194
.arg = "STRING",
1195
.doc = "GnuTLS priority string for the TLS handshake",
1196
.group = 1 },
1197
{ .name = "delay", .key = 131,
1198
.arg = "SECONDS",
1199
.doc = "Maximum delay to wait for interface startup",
1200
.group = 2 },
1201
/*
1202
* These reproduce what we would get without ARGP_NO_HELP
1203
*/
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
1210
{ .name = NULL }
1211
};
648
/* Combines file name and path and returns the malloced new
649
string. some sane checks could/should be added */
650
static const char *combinepath(const char *first, const char *second){
651
size_t f_len = strlen(first);
652
size_t s_len = strlen(second);
653
char *tmp = malloc(f_len + s_len + 2);
654
if (tmp == NULL){
655
return NULL;
656
}
657
if(f_len > 0){
658
memcpy(tmp, first, f_len); /* Spurious warning */
659
}
660
tmp[f_len] = '/';
661
if(s_len > 0){
662
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
663
}
664
tmp[f_len + 1 + s_len] = '\0';
665
return tmp;
666
}
667
668
669
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
670
AvahiServerConfig config;
671
AvahiSServiceBrowser *sb = NULL;
672
int error;
673
int ret;
674
int debug_int;
675
int returncode = EXIT_SUCCESS;
676
const char *interface = "eth0";
677
struct ifreq network;
678
int sd;
679
char *connect_to = NULL;
680
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
681
mandos_context mc = { .simple_poll = NULL, .server = NULL,
682
.dh_bits = 1024, .priority = "SECURE256"};
1212
683
1213
error_t parse_opt(int key, char *arg,
1214
struct argp_state *state){
1215
errno = 0;
1216
switch(key){
1217
case 128: /* --debug */
1218
debug = true;
1219
break;
1220
case 'c': /* --connect */
1221
connect_to = arg;
1222
break;
1223
case 'i': /* --interface */
1224
interface = arg;
1225
break;
1226
case 's': /* --seckey */
1227
seckey = arg;
1228
break;
1229
case 'p': /* --pubkey */
1230
pubkey = arg;
1231
break;
1232
case 129: /* --dh-bits */
1233
errno = 0;
1234
tmpmax = strtoimax(arg, &tmp, 10);
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
1238
}
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1240
break;
1241
case 130: /* --priority */
1242
mc.priority = arg;
1243
break;
1244
case 131: /* --delay */
1245
errno = 0;
1246
delay = strtof(arg, &tmp);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
1249
}
1250
break;
1251
/*
1252
* These reproduce what we would get without ARGP_NO_HELP
1253
*/
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
1264
break;
684
debug_int = debug ? 1 : 0;
685
while (true){
686
struct option long_options[] = {
687
{"debug", no_argument, &debug_int, 1},
688
{"connect", required_argument, NULL, 'c'},
689
{"interface", required_argument, NULL, 'i'},
690
{"keydir", required_argument, NULL, 'd'},
691
{"seckey", required_argument, NULL, 's'},
692
{"pubkey", required_argument, NULL, 'p'},
693
{"dh-bits", required_argument, NULL, 'D'},
694
{"priority", required_argument, NULL, 'P'},
695
{0, 0, 0, 0} };
696
697
int option_index = 0;
698
ret = getopt_long (argc, argv, "i:", long_options,
699
&option_index);
700
701
if (ret == -1){
702
break;
703
}
704
705
switch(ret){
706
case 0:
707
break;
708
case 'i':
709
interface = optarg;
710
break;
711
case 'c':
712
connect_to = optarg;
713
break;
714
case 'd':
715
keydir = optarg;
716
break;
717
case 'p':
718
pubkeyfile = optarg;
719
break;
720
case 's':
721
seckeyfile = optarg;
722
break;
723
case 'D':
724
errno = 0;
725
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
726
if (errno){
727
perror("strtol");
728
exit(EXIT_FAILURE);
729
}
730
break;
731
case 'P':
732
mc.priority = optarg;
733
break;
734
case '?':
1265
735
default:
1266
return ARGP_ERR_UNKNOWN;
1267
}
1268
return errno;
1269
}
1270
1271
struct argp argp = { .options = options, .parser = parse_opt,
1272
.args_doc = "",
1273
.doc = "Mandos client -- Get and decrypt"
1274
" passwords from a Mandos server" };
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1277
switch(ret){
1278
case 0:
1279
break;
1280
case ENOMEM:
1281
default:
1282
errno = ret;
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1285
goto end;
1286
case EINVAL:
1287
exitcode = EX_USAGE;
1288
goto end;
1289
}
1290
}
1291
1292
if(not debug){
1293
avahi_set_log_function(empty_log);
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
1320
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
from the signal handler */
1323
/* Initialize the pseudo-RNG for Avahi */
1324
srand((unsigned int) time(NULL));
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1328
exitcode = EX_UNAVAILABLE;
1329
goto end;
1330
}
1331
1332
sigemptyset(&sigterm_action.sa_mask);
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
if(ret == -1){
1335
perror("sigaddset");
1336
exitcode = EX_OSERR;
1337
goto end;
1338
}
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
if(ret == -1){
1341
perror("sigaddset");
1342
exitcode = EX_OSERR;
1343
goto end;
1344
}
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
if(ret == -1){
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1354
*/
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
if(ret == -1){
1357
perror("sigaction");
1358
return EX_OSERR;
1359
}
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
if(ret == -1){
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1365
goto end;
1366
}
1367
}
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
if(ret == -1){
1370
perror("sigaction");
1371
return EX_OSERR;
1372
}
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
if(ret == -1){
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1378
goto end;
1379
}
1380
}
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
if(ret == -1){
1383
perror("sigaction");
1384
return EX_OSERR;
1385
}
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
if(ret == -1){
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1391
goto end;
1392
}
1393
}
1394
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
736
exit(EXIT_FAILURE);
737
}
738
}
739
debug = debug_int ? true : false;
740
741
pubkeyfile = combinepath(keydir, pubkeyfile);
742
if (pubkeyfile == NULL){
743
perror("combinepath");
744
returncode = EXIT_FAILURE;
745
goto exit;
746
}
747
748
seckeyfile = combinepath(keydir, seckeyfile);
749
if (seckeyfile == NULL){
750
perror("combinepath");
751
goto exit;
752
}
753
1397
754
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
755
if(if_index == 0){
1399
756
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1415
#ifdef __linux__
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1420
if(ret == -1){
1421
restore_loglevel = false;
1422
perror("klogctl");
1423
}
1424
#endif /* __linux__ */
757
exit(EXIT_FAILURE);
758
}
759
760
if(connect_to != NULL){
761
/* Connect directly, do not use Zeroconf */
762
/* (Mainly meant for debugging) */
763
char *address = strrchr(connect_to, ':');
764
if(address == NULL){
765
fprintf(stderr, "No colon in address\n");
766
exit(EXIT_FAILURE);
767
}
768
errno = 0;
769
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
770
if(errno){
771
perror("Bad port number");
772
exit(EXIT_FAILURE);
773
}
774
*address = '\0';
775
address = connect_to;
776
ret = start_mandos_communication(address, port, if_index, &mc);
777
if(ret < 0){
778
exit(EXIT_FAILURE);
779
} else {
780
exit(EXIT_SUCCESS);
781
}
782
}
1425
783
1426
784
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
785
if(sd < 0) {
1428
786
perror("socket");
1429
exitcode = EX_OSERR;
1430
#ifdef __linux__
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
goto end;
787
returncode = EXIT_FAILURE;
788
goto exit;
1445
789
}
1446
strcpy(network.ifr_name, interface);
790
strcpy(network.ifr_name, interface); /* Spurious warning */
1447
791
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
792
if(ret == -1){
793
1449
794
perror("ioctl SIOCGIFFLAGS");
1450
#ifdef __linux__
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1465
goto end;
795
returncode = EXIT_FAILURE;
796
goto exit;
1466
797
}
1467
798
if((network.ifr_flags & IFF_UP) == 0){
1468
799
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
800
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
801
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1475
#ifdef __linux__
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
}
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1498
break;
1499
}
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1504
}
1505
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1512
}
1513
#ifdef __linux__
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
1537
}
1538
1539
if(quit_now){
1540
goto end;
1541
}
1542
1543
ret = init_gnutls_global(pubkey, seckey);
1544
if(ret == -1){
1545
fprintf(stderr, "init_gnutls_global failed\n");
1546
exitcode = EX_UNAVAILABLE;
1547
goto end;
1548
} else {
1549
gnutls_initialized = true;
1550
}
1551
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
1560
goto end;
1561
}
1562
1563
if(quit_now){
1564
goto end;
1565
}
1566
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
} else {
1572
gpgme_initialized = true;
1573
}
1574
1575
if(quit_now){
1576
goto end;
1577
}
1578
1579
if(connect_to != NULL){
1580
/* Connect directly, do not use Zeroconf */
1581
/* (Mainly meant for debugging) */
1582
char *address = strrchr(connect_to, ':');
1583
if(address == NULL){
1584
fprintf(stderr, "No colon in address\n");
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1593
uint16_t port;
1594
errno = 0;
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1607
port = (uint16_t)tmpmax;
1608
*address = '\0';
1609
address = connect_to;
1610
/* Colon in address indicates IPv6 */
1611
int af;
1612
if(strchr(address, ':') != NULL){
1613
af = AF_INET6;
1614
} else {
1615
af = AF_INET;
1616
}
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
1644
exitcode = EXIT_SUCCESS;
1645
}
1646
goto end;
1647
}
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1653
{
1654
AvahiServerConfig config;
1655
/* Do not publish any local Zeroconf records */
802
perror("ioctl SIOCSIFFLAGS");
803
returncode = EXIT_FAILURE;
804
goto exit;
805
}
806
}
807
close(sd);
808
809
if (not debug){
810
avahi_set_log_function(empty_log);
811
}
812
813
/* Initialize the psuedo-RNG */
814
srand((unsigned int) time(NULL));
815
816
/* Allocate main loop object */
817
if (!(mc.simple_poll = avahi_simple_poll_new())) {
818
fprintf(stderr, "Failed to create simple poll object.\n");
819
returncode = EXIT_FAILURE;
820
goto exit;
821
}
822
823
/* Do not publish any local records */
1656
824
avahi_server_config_init(&config);
1657
825
config.publish_hinfo = 0;
1658
826
config.publish_addresses = 0;
1659
827
config.publish_workstation = 0;
1660
828
config.publish_domain = 0;
1661
829
1662
830
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
831
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
832
&config, NULL, NULL, &error);
1666
833
1667
/* Free the Avahi configuration data */
834
/* Free the configuration data */
1668
835
avahi_server_config_free(&config);
1669
}
1670
1671
/* Check if creating the Avahi server object succeeded */
1672
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1680
goto end;
1681
}
1682
1683
/* Create the Avahi service browser */
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1687
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1695
goto end;
1696
}
1697
1698
/* Run the main loop */
1699
1700
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
1705
1706
end:
1707
1708
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
1710
}
1711
1712
/* Cleanup things */
1713
if(sb != NULL)
1714
avahi_s_service_browser_free(sb);
1715
1716
if(mc.server != NULL)
1717
avahi_server_free(mc.server);
1718
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
1721
1722
if(gnutls_initialized){
1723
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
1725
gnutls_dh_params_deinit(mc.dh_params);
1726
}
1727
1728
if(gpgme_initialized){
1729
gpgme_release(mc.ctx);
1730
}
1731
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
1805
}
1806
}
1807
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1827
return exitcode;
836
837
/* Check if creating the server object succeeded */
838
if (!mc.server) {
839
fprintf(stderr, "Failed to create server: %s\n",
840
avahi_strerror(error));
841
returncode = EXIT_FAILURE;
842
goto exit;
843
}
844
845
/* Create the service browser */
846
sb = avahi_s_service_browser_new(mc.server, if_index,
847
AVAHI_PROTO_INET6,
848
"_mandos._tcp", NULL, 0,
849
browse_callback, &mc);
850
if (!sb) {
851
fprintf(stderr, "Failed to create service browser: %s\n",
852
avahi_strerror(avahi_server_errno(mc.server)));
853
returncode = EXIT_FAILURE;
854
goto exit;
855
}
856
857
/* Run the main loop */
858
859
if (debug){
860
fprintf(stderr, "Starting avahi loop search\n");
861
}
862
863
avahi_simple_poll_loop(mc.simple_poll);
864
865
exit:
866
867
if (debug){
868
fprintf(stderr, "%s exiting\n", argv[0]);
869
}
870
871
/* Cleanup things */
872
if (sb)
873
avahi_s_service_browser_free(sb);
874
875
if (mc.server)
876
avahi_server_free(mc.server);
877
878
if (mc.simple_poll)
879
avahi_simple_poll_free(mc.simple_poll);
880
free(pubkeyfile);
881
free(seckeyfile);
882
883
return returncode;
1828
884
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0