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» Revision
24.1.51
(compared to revision 237.2.35)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#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() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
56
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
76
65
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
71
90
72
/* Avahi */
91
73
/* All Avahi types, constants and functions
99
81
#include <avahi-common/error.h>
100
82
101
83
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
104
85
gnutls_*
105
86
init_gnutls_session(),
106
87
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
89
GNUTLS_OPENPGP_FMT_BASE64 */
110
90
111
91
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
114
93
gpgme_*
115
94
GPGME_PROTOCOL_OpenPGP,
116
95
GPG_ERR_NO_* */
117
96
118
97
#define BUFFER_SIZE 256
119
98
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
125
101
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
127
103
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;
130
104
131
105
/* Used for passing in values through the Avahi callback functions */
132
106
typedef struct {
136
110
unsigned int dh_bits;
137
111
gnutls_dh_params_t dh_params;
138
112
const char *priority;
139
gpgme_ctx_t ctx;
140
113
} mandos_context;
141
114
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
150
115
/*
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
153
118
* "buffer_length" is how much is already used.
154
119
*/
155
size_t incbuffer(char **buffer, size_t buffer_length,
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
156
121
size_t buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
158
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
124
if (buffer == NULL){
160
125
return 0;
161
126
}
162
127
buffer_capacity += BUFFER_SIZE;
165
130
}
166
131
167
132
/*
168
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
169
135
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
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;
172
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
173
146
gpgme_engine_info_t engine_info;
174
147
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");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
214
150
}
215
151
216
152
/* Init GPGME */
217
153
gpgme_check_version(NULL);
218
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
220
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
157
gpgme_strsource(rc), gpgme_strerror(rc));
222
return false;
158
return -1;
223
159
}
224
160
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){
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){
228
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
165
gpgme_strsource(rc), gpgme_strerror(rc));
230
return false;
166
return -1;
231
167
}
232
168
while(engine_info != NULL){
233
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
234
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
235
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
236
172
break;
237
173
}
238
174
engine_info = engine_info->next;
239
175
}
240
176
if(engine_info == NULL){
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");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
275
179
}
276
180
277
181
/* Create new GPGME data buffer from memory cryptotext */
278
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
183
0);
280
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
281
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
186
gpgme_strsource(rc), gpgme_strerror(rc));
283
187
return -1;
285
189
286
190
/* Create new empty GPGME data buffer for the plaintext */
287
191
rc = gpgme_data_new(&dh_plain);
288
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
289
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
194
gpgme_strsource(rc), gpgme_strerror(rc));
291
195
gpgme_data_release(dh_crypto);
292
196
return -1;
293
197
}
294
198
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
295
208
/* Decrypt data from the cryptotext data buffer to the plaintext
296
209
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
299
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
213
gpgme_strsource(rc), gpgme_strerror(rc));
301
214
plaintext_length = -1;
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;
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){
317
238
while(recipient != NULL){
318
239
fprintf(stderr, "Public key algorithm: %s\n",
319
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
325
246
}
326
247
}
327
248
}
328
goto decrypt_end;
329
}
330
331
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
333
249
}
334
250
335
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
338
254
plaintext_length = -1;
339
255
goto decrypt_end;
340
256
}
341
257
342
258
*plaintext = NULL;
343
259
while(true){
344
plaintext_capacity = incbuffer(plaintext,
260
plaintext_capacity = adjustbuffer(plaintext,
345
261
(size_t)plaintext_length,
346
262
plaintext_capacity);
347
if(plaintext_capacity == 0){
348
perror("incbuffer");
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
349
265
plaintext_length = -1;
350
266
goto decrypt_end;
351
267
}
353
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
354
270
BUFFER_SIZE);
355
271
/* Print the data, if any */
356
if(ret == 0){
272
if (ret == 0){
357
273
/* EOF */
358
274
break;
359
275
}
364
280
}
365
281
plaintext_length += ret;
366
282
}
367
283
368
284
if(debug){
369
285
fprintf(stderr, "Decrypted password is: ");
370
286
for(ssize_t i = 0; i < plaintext_length; i++){
383
299
return plaintext_length;
384
300
}
385
301
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)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
390
305
ret = "(unknown)";
391
306
return ret;
392
307
}
397
312
fprintf(stderr, "GnuTLS: %s", string);
398
313
}
399
314
400
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
402
318
int ret;
403
319
404
320
if(debug){
406
322
}
407
323
408
324
ret = gnutls_global_init();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
412
328
return -1;
413
329
}
414
330
415
if(debug){
331
if (debug){
416
332
/* "Use a log level over 10 to enable all debugging options."
417
333
* - GnuTLS manual
418
334
*/
421
337
}
422
338
423
339
/* OpenPGP credentials */
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();
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 ();
432
345
return -1;
433
346
}
434
347
435
348
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
439
352
}
440
353
441
354
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
445
357
fprintf(stderr,
446
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
449
361
safer_gnutls_strerror(ret));
450
362
goto globalfail;
451
363
}
452
364
453
365
/* GnuTLS server initialization */
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
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
469
381
return 0;
470
382
471
383
globalfail:
472
473
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
474
386
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
476
387
return -1;
388
477
389
}
478
390
479
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
480
393
int ret;
481
394
/* GnuTLS session creation */
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){
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
489
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
398
safer_gnutls_strerror(ret));
491
399
}
492
400
493
401
{
494
402
const char *err;
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){
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
503
405
fprintf(stderr, "Syntax error at: %s\n", err);
504
406
fprintf(stderr, "GnuTLS error: %s\n",
505
407
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
408
gnutls_deinit (*session);
507
409
return -1;
508
410
}
509
411
}
510
412
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){
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
520
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
417
safer_gnutls_strerror(ret));
522
gnutls_deinit(*session);
418
gnutls_deinit (*session);
523
419
return -1;
524
420
}
525
421
526
422
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
528
425
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
530
427
531
428
return 0;
532
429
}
538
435
/* Called when a Mandos server is found */
539
436
static int start_mandos_communication(const char *ip, uint16_t port,
540
437
AvahiIfIndex if_index,
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;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
548
441
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
550
443
size_t buffer_length = 0;
551
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
552
446
size_t written;
553
int retval = -1;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
554
449
gnutls_session_t session;
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){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
575
453
return -1;
576
454
}
577
455
578
456
if(debug){
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
580
458
"\n", ip, port);
581
459
}
582
460
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
if(tcp_sd < 0){
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
585
463
perror("socket");
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 ){
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 ){
602
481
perror("inet_pton");
603
goto mandos_end;
482
return -1;
604
483
}
605
484
if(ret == 0){
606
485
fprintf(stderr, "Bad address: %s\n", ip);
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
}
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
630
489
631
if(quit_now){
632
goto mandos_end;
633
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
634
491
635
492
if(debug){
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){
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){
659
498
perror("inet_ntop");
660
499
} else {
661
500
if(strcmp(addrstr, ip) != 0){
664
503
}
665
504
}
666
505
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){
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
677
508
perror("connect");
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
683
}
684
509
return -1;
510
}
511
685
512
const char *out = mandos_protocol_version;
686
513
written = 0;
687
while(true){
514
while (true){
688
515
size_t out_size = strlen(out);
689
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
690
517
out_size - written));
691
if(ret == -1){
518
if (ret == -1){
692
519
perror("write");
520
retval = -1;
693
521
goto mandos_end;
694
522
}
695
523
written += (size_t)ret;
696
524
if(written < out_size){
697
525
continue;
698
526
} else {
699
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
700
528
written = 0;
701
529
out = "\r\n";
702
530
} else {
703
531
break;
704
532
}
705
533
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
710
534
}
711
535
712
536
if(debug){
713
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
714
538
}
715
539
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
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
731
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
545
733
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
734
547
if(debug){
735
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
736
gnutls_perror(ret);
549
gnutls_perror (ret);
737
550
}
551
retval = -1;
738
552
goto mandos_end;
739
553
}
740
554
741
555
/* Read OpenPGP packet that contains the wanted password */
742
556
743
557
if(debug){
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
745
559
ip);
746
560
}
747
561
748
562
while(true){
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
755
564
buffer_capacity);
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){
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){
768
574
break;
769
575
}
770
if(sret < 0){
771
switch(sret){
576
if (ret < 0){
577
switch(ret){
772
578
case GNUTLS_E_INTERRUPTED:
773
579
case GNUTLS_E_AGAIN:
774
580
break;
775
581
case GNUTLS_E_REHANDSHAKE:
776
do {
777
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
582
do{
583
ret = gnutls_handshake (session);
782
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
if(ret < 0){
585
if (ret < 0){
784
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
785
gnutls_perror(ret);
587
gnutls_perror (ret);
588
retval = -1;
786
589
goto mandos_end;
787
590
}
788
591
break;
789
592
default:
790
593
fprintf(stderr, "Unknown error while reading data from"
791
594
" encrypted session with Mandos server\n");
792
gnutls_bye(session, GNUTLS_SHUT_RDWR);
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
793
597
goto mandos_end;
794
598
}
795
599
} else {
796
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
797
601
}
798
602
}
799
603
801
605
fprintf(stderr, "Closing TLS session\n");
802
606
}
803
607
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;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
817
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
818
612
buffer_length,
819
&decrypted_buffer);
820
if(decrypted_buffer_size >= 0){
821
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
822
616
written = 0;
823
617
while(written < (size_t) decrypted_buffer_size){
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);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
831
621
if(ret == 0 and ferror(stdout)){
832
622
if(debug){
833
623
fprintf(stderr, "Error writing encrypted data: %s\n",
834
624
strerror(errno));
835
625
}
836
goto mandos_end;
626
retval = -1;
627
break;
837
628
}
838
629
written += (size_t)ret;
839
630
}
840
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
841
634
}
842
635
}
843
636
844
637
/* Shutdown procedure */
845
638
846
639
mandos_end:
847
free(decrypted_buffer);
848
640
free(buffer);
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
}
641
close(tcp_sd);
642
gnutls_deinit (session);
859
643
return retval;
860
644
}
861
645
862
646
static void resolve_callback(AvahiSServiceResolver *r,
863
647
AvahiIfIndex interface,
864
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
865
649
AvahiResolverEvent event,
866
650
const char *name,
867
651
const char *type,
872
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
658
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
877
662
878
663
/* Called whenever a service has been resolved successfully or
879
664
timed out */
880
665
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
666
switch (event) {
886
667
default:
887
668
case AVAHI_RESOLVER_FAILURE:
888
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
891
672
break;
892
673
893
674
case AVAHI_RESOLVER_FOUND:
896
677
avahi_address_snprint(ip, sizeof(ip), address);
897
678
if(debug){
898
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
901
682
}
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);
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
avahi_simple_poll_quit(mc->simple_poll);
906
686
}
907
687
}
908
688
}
909
689
avahi_s_service_resolver_free(r);
910
690
}
911
691
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);
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 */
923
704
924
705
/* Called whenever a new services becomes available on the LAN or
925
706
is removed from the LAN */
926
707
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
708
switch (event) {
932
709
default:
933
710
case AVAHI_BROWSER_FAILURE:
934
711
935
712
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
938
715
return;
939
716
940
717
case AVAHI_BROWSER_NEW:
943
720
the callback function is called the Avahi server will free the
944
721
resolver for us. */
945
722
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
949
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
728
name, avahi_strerror(avahi_server_errno(mc->server)));
951
729
break;
952
730
953
731
case AVAHI_BROWSER_REMOVE:
962
740
}
963
741
}
964
742
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;
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;
977
761
}
978
762
979
/*
980
* This function determines if a directory entry in /sys/class/net
981
* corresponds to an acceptable network device.
982
* (This function is passed to scandir(3) as a filter function.)
983
*/
984
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
994
return 0;
995
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1007
perror("malloc");
1008
close(flags_fd);
1009
return 0;
1010
}
1011
while(to_read > 0){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1013
(size_t)to_read));
1014
if(ssret == -1){
1015
perror("read");
1016
free(flagstring);
1017
close(flags_fd);
1018
return 0;
1019
}
1020
to_read -= ssret;
1021
if(ssret == 0){
1022
break;
1023
}
1024
}
1025
close(flags_fd);
1026
intmax_t tmpmax;
1027
char *tmp;
1028
errno = 0;
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1033
if(debug){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1036
}
1037
free(flagstring);
1038
return 0;
1039
}
1040
free(flagstring);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1044
if(debug){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1046
if_entry->d_name);
1047
}
1048
return 0;
1049
}
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1052
if(debug){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1054
if_entry->d_name);
1055
}
1056
return 1;
1057
}
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1060
if(debug){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1062
if_entry->d_name);
1063
}
1064
return 0;
1065
}
1066
/* Accept this device */
1067
if(debug){
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1069
if_entry->d_name);
1070
}
1071
return 1;
1072
}
1073
763
1074
764
int main(int argc, char *argv[]){
1075
AvahiSServiceBrowser *sb = NULL;
1076
int error;
1077
int ret;
1078
intmax_t tmpmax;
1079
char *tmp;
1080
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
1082
struct ifreq network;
1083
int sd = -1;
1084
bool take_down_interface = false;
1085
uid_t uid;
1086
gid_t gid;
1087
char tempdir[] = "/tmp/mandosXXXXXX";
1088
bool tempdir_created = false;
1089
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
const char *seckey = PATHDIR "/" SECKEY;
1091
const char *pubkey = PATHDIR "/" PUBKEY;
1092
1093
bool gnutls_initialized = false;
1094
bool gpgme_initialized = false;
1095
float delay = 2.5f;
1096
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1098
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1099
1100
uid = getuid();
1101
gid = getgid();
1102
1103
/* Lower any group privileges we might have, just to be safe */
1104
errno = 0;
1105
ret = setgid(gid);
1106
if(ret == -1){
1107
perror("setgid");
1108
}
1109
1110
/* Lower user privileges (temporarily) */
1111
errno = 0;
1112
ret = seteuid(uid);
1113
if(ret == -1){
1114
perror("seteuid");
1115
}
1116
1117
if(quit_now){
1118
goto end;
1119
}
1120
1121
{
1122
struct argp_option options[] = {
1123
{ .name = "debug", .key = 128,
1124
.doc = "Debug mode", .group = 3 },
1125
{ .name = "connect", .key = 'c',
1126
.arg = "ADDRESS:PORT",
1127
.doc = "Connect directly to a specific Mandos server",
1128
.group = 1 },
1129
{ .name = "interface", .key = 'i',
1130
.arg = "NAME",
1131
.doc = "Network interface that will be used to search for"
1132
" Mandos servers",
1133
.group = 1 },
1134
{ .name = "seckey", .key = 's',
1135
.arg = "FILE",
1136
.doc = "OpenPGP secret key file base name",
1137
.group = 1 },
1138
{ .name = "pubkey", .key = 'p',
1139
.arg = "FILE",
1140
.doc = "OpenPGP public key file base name",
1141
.group = 2 },
1142
{ .name = "dh-bits", .key = 129,
1143
.arg = "BITS",
1144
.doc = "Bit length of the prime number used in the"
1145
" Diffie-Hellman key exchange",
1146
.group = 2 },
1147
{ .name = "priority", .key = 130,
1148
.arg = "STRING",
1149
.doc = "GnuTLS priority string for the TLS handshake",
1150
.group = 1 },
1151
{ .name = "delay", .key = 131,
1152
.arg = "SECONDS",
1153
.doc = "Maximum delay to wait for interface startup",
1154
.group = 2 },
1155
{ .name = NULL }
1156
};
1157
1158
error_t parse_opt(int key, char *arg,
1159
struct argp_state *state){
1160
switch(key){
1161
case 128: /* --debug */
1162
debug = true;
1163
break;
1164
case 'c': /* --connect */
1165
connect_to = arg;
1166
break;
1167
case 'i': /* --interface */
1168
interface = arg;
1169
break;
1170
case 's': /* --seckey */
1171
seckey = arg;
1172
break;
1173
case 'p': /* --pubkey */
1174
pubkey = arg;
1175
break;
1176
case 129: /* --dh-bits */
1177
errno = 0;
1178
tmpmax = strtoimax(arg, &tmp, 10);
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
1183
}
1184
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1185
break;
1186
case 130: /* --priority */
1187
mc.priority = arg;
1188
break;
1189
case 131: /* --delay */
1190
errno = 0;
1191
delay = strtof(arg, &tmp);
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1195
}
1196
break;
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
1200
break;
1201
default:
1202
return ARGP_ERR_UNKNOWN;
1203
}
1204
return 0;
1205
}
1206
1207
struct argp argp = { .options = options, .parser = parse_opt,
1208
.args_doc = "",
1209
.doc = "Mandos client -- Get and decrypt"
1210
" passwords from a Mandos server" };
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1216
}
1217
}
1218
1219
if(not debug){
1220
avahi_set_log_function(empty_log);
1221
}
1222
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1226
alphasort);
1227
if(ret >= 1){
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1230
if(debug){
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1232
}
1233
if(interface == NULL){
1234
perror("malloc");
1235
free(direntries);
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;
781
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;
859
}
860
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");
1236
868
exitcode = EXIT_FAILURE;
1237
869
goto end;
1238
870
}
1239
free(direntries);
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;
1240
892
} else {
1241
free(direntries);
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1244
goto end;
1245
}
1246
}
1247
1248
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
from the signal handler */
1250
/* Initialize the pseudo-RNG for Avahi */
1251
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
sigemptyset(&sigterm_action.sa_mask);
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1261
if(ret == -1){
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1264
goto end;
1265
}
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1267
if(ret == -1){
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1270
goto end;
1271
}
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1273
if(ret == -1){
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1276
goto end;
1277
}
1278
/* Need to check if the handler is SIG_IGN before handling:
1279
| [[info:libc:Initial Signal Actions]] |
1280
| [[info:libc:Basic Signal Handling]] |
1281
*/
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1283
if(ret == -1){
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1286
}
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1289
if(ret == -1){
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1292
goto end;
1293
}
1294
}
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1296
if(ret == -1){
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1299
}
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1302
if(ret == -1){
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1305
goto end;
1306
}
1307
}
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1309
if(ret == -1){
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1312
}
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1315
if(ret == -1){
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
}
1321
1322
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
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
1324
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
1325
937
if(if_index == 0){
1326
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1327
exitcode = EXIT_FAILURE;
1328
goto end;
1329
}
1330
1331
if(quit_now){
1332
goto end;
1333
}
1334
1335
/* Re-raise priviliges */
1336
errno = 0;
1337
ret = seteuid(0);
1338
if(ret == -1){
1339
perror("seteuid");
1340
}
1341
1342
#ifdef __linux__
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
messages to mess up the prompt */
1345
ret = klogctl(8, NULL, 5);
1346
bool restore_loglevel = true;
1347
if(ret == -1){
1348
restore_loglevel = false;
1349
perror("klogctl");
1350
}
1351
#endif /* __linux__ */
1352
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1354
if(sd < 0){
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1357
#ifdef __linux__
1358
if(restore_loglevel){
1359
ret = klogctl(7, NULL, 0);
1360
if(ret == -1){
1361
perror("klogctl");
1362
}
1363
}
1364
#endif /* __linux__ */
1365
/* Lower privileges */
1366
errno = 0;
1367
ret = seteuid(uid);
1368
if(ret == -1){
1369
perror("seteuid");
1370
}
1371
goto end;
1372
}
1373
strcpy(network.ifr_name, interface);
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
if(ret == -1){
1376
perror("ioctl SIOCGIFFLAGS");
1377
#ifdef __linux__
1378
if(restore_loglevel){
1379
ret = klogctl(7, NULL, 0);
1380
if(ret == -1){
1381
perror("klogctl");
1382
}
1383
}
1384
#endif /* __linux__ */
1385
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
if((network.ifr_flags & IFF_UP) == 0){
1395
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1398
if(ret == -1){
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1402
#ifdef __linux__
1403
if(restore_loglevel){
1404
ret = klogctl(7, NULL, 0);
1405
if(ret == -1){
1406
perror("klogctl");
1407
}
1408
}
1409
#endif /* __linux__ */
1410
/* Lower privileges */
1411
errno = 0;
1412
ret = seteuid(uid);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
goto end;
1417
}
1418
}
1419
/* sleep checking until interface is running */
1420
for(int i=0; i < delay * 4; i++){
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1422
if(ret == -1){
1423
perror("ioctl SIOCGIFFLAGS");
1424
} else if(network.ifr_flags & IFF_RUNNING){
1425
break;
1426
}
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1428
ret = nanosleep(&sleeptime, NULL);
1429
if(ret == -1 and errno != EINTR){
1430
perror("nanosleep");
1431
}
1432
}
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1436
if(ret == -1){
1437
perror("close");
1438
}
1439
}
1440
#ifdef __linux__
1441
if(restore_loglevel){
1442
/* Restores kernel loglevel to default */
1443
ret = klogctl(7, NULL, 0);
1444
if(ret == -1){
1445
perror("klogctl");
1446
}
1447
}
1448
#endif /* __linux__ */
1449
/* Lower privileges */
1450
errno = 0;
1451
if(take_down_interface){
1452
/* Lower privileges */
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror("seteuid");
1456
}
1457
} else {
1458
/* Lower privileges permanently */
1459
ret = setuid(uid);
1460
if(ret == -1){
1461
perror("setuid");
1462
}
1463
}
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
ret = init_gnutls_global(pubkey, seckey);
1471
if(ret == -1){
1472
fprintf(stderr, "init_gnutls_global failed\n");
1473
exitcode = EXIT_FAILURE;
1474
goto end;
1475
} else {
1476
gnutls_initialized = true;
1477
}
1478
1479
if(quit_now){
1480
goto end;
1481
}
1482
1483
tempdir_created = true;
1484
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1486
perror("mkdtemp");
1487
goto end;
1488
}
1489
1490
if(quit_now){
1491
goto end;
1492
}
1493
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
fprintf(stderr, "init_gpgme failed\n");
1496
exitcode = EXIT_FAILURE;
1497
goto end;
1498
} else {
1499
gpgme_initialized = true;
1500
}
1501
1502
if(quit_now){
1503
goto end;
1504
}
1505
1506
if(connect_to != NULL){
1507
/* Connect directly, do not use Zeroconf */
1508
/* (Mainly meant for debugging) */
1509
char *address = strrchr(connect_to, ':');
1510
if(address == NULL){
1511
fprintf(stderr, "No colon in address\n");
1512
exitcode = EXIT_FAILURE;
1513
goto end;
1514
}
1515
1516
if(quit_now){
1517
goto end;
1518
}
1519
1520
uint16_t port;
1521
errno = 0;
1522
tmpmax = strtoimax(address+1, &tmp, 10);
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1525
fprintf(stderr, "Bad port number\n");
1526
exitcode = EXIT_FAILURE;
1527
goto end;
1528
}
1529
1530
if(quit_now){
1531
goto end;
1532
}
1533
1534
port = (uint16_t)tmpmax;
1535
*address = '\0';
1536
address = connect_to;
1537
/* Colon in address indicates IPv6 */
1538
int af;
1539
if(strchr(address, ':') != NULL){
1540
af = AF_INET6;
1541
} else {
1542
af = AF_INET;
1543
}
1544
1545
if(quit_now){
1546
goto end;
1547
}
1548
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
1553
exitcode = EXIT_SUCCESS;
1554
}
1555
goto end;
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
{
1563
AvahiServerConfig config;
1564
/* Do not publish any local Zeroconf records */
1565
avahi_server_config_init(&config);
1566
config.publish_hinfo = 0;
1567
config.publish_addresses = 0;
1568
config.publish_workstation = 0;
1569
config.publish_domain = 0;
1570
1571
/* Allocate a new server */
1572
mc.server = avahi_server_new(avahi_simple_poll_get
1573
(mc.simple_poll), &config, NULL,
1574
NULL, &error);
1575
1576
/* Free the Avahi configuration data */
1577
avahi_server_config_free(&config);
1578
}
1579
1580
/* Check if creating the Avahi server object succeeded */
1581
if(mc.server == NULL){
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1583
avahi_strerror(error));
1584
exitcode = EXIT_FAILURE;
1585
goto end;
1586
}
1587
1588
if(quit_now){
1589
goto end;
1590
}
1591
1592
/* Create the Avahi service browser */
1593
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1595
NULL, 0, browse_callback, NULL);
1596
if(sb == NULL){
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1598
avahi_strerror(avahi_server_errno(mc.server)));
1599
exitcode = EXIT_FAILURE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1607
/* Run the main loop */
1608
1609
if(debug){
1610
fprintf(stderr, "Starting Avahi loop search\n");
1611
}
1612
1613
avahi_simple_poll_loop(mc.simple_poll);
1614
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
1615
1031
end:
1616
1617
if(debug){
1618
fprintf(stderr, "%s exiting\n", argv[0]);
1619
}
1620
1621
/* Cleanup things */
1622
if(sb != NULL)
1623
avahi_s_service_browser_free(sb);
1624
1625
if(mc.server != NULL)
1626
avahi_server_free(mc.server);
1627
1628
if(mc.simple_poll != NULL)
1629
avahi_simple_poll_free(mc.simple_poll);
1630
1631
if(gnutls_initialized){
1632
gnutls_certificate_free_credentials(mc.cred);
1633
gnutls_global_deinit();
1634
gnutls_dh_params_deinit(mc.dh_params);
1635
}
1636
1637
if(gpgme_initialized){
1638
gpgme_release(mc.ctx);
1639
}
1640
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1644
errno = 0;
1645
ret = seteuid(0);
1646
if(ret == -1){
1647
perror("seteuid");
1648
}
1649
if(geteuid() == 0){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1656
if(ret == -1){
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1658
}
1659
}
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror("close");
1663
}
1664
/* Lower privileges permanently */
1665
errno = 0;
1666
ret = setuid(uid);
1667
if(ret == -1){
1668
perror("setuid");
1669
}
1670
}
1671
}
1672
1673
/* Removes the temp directory used by GPGME */
1674
if(tempdir_created){
1675
DIR *d;
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1678
if(d == NULL){
1679
if(errno != ENOENT){
1680
perror("opendir");
1681
}
1682
} else {
1683
while(true){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1686
break;
1687
}
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1693
continue;
1694
}
1695
char *fullname = NULL;
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
1697
direntry->d_name);
1698
if(ret < 0){
1699
perror("asprintf");
1700
continue;
1701
}
1702
ret = remove(fullname);
1703
if(ret == -1){
1704
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1705
strerror(errno));
1706
}
1707
free(fullname);
1708
}
1709
closedir(d);
1710
}
1711
ret = rmdir(tempdir);
1712
if(ret == -1 and errno != ENOENT){
1713
perror("rmdir");
1714
}
1715
}
1716
1717
if(quit_now){
1718
sigemptyset(&old_sigterm_action.sa_mask);
1719
old_sigterm_action.sa_handler = SIG_DFL;
1720
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1721
&old_sigterm_action,
1722
NULL));
1723
if(ret == -1){
1724
perror("sigaction");
1725
}
1726
do {
1727
ret = raise(signal_received);
1728
} while(ret != 0 and errno == EINTR);
1729
if(ret != 0){
1730
perror("raise");
1731
abort();
1732
}
1733
TEMP_FAILURE_RETRY(pause());
1734
}
1735
1736
return exitcode;
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;
1737
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0