To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-request.c
- browse files at revision 24.1.35
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.35
- Committer: Björn Påhlsson
- Date: 2008-08-10 00:18:25 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 59.
- Revision ID: belorn@braxen-20080810001825-nxr0rza1hclj4mr7
version 1.0
- 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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 */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
57
53
#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() */
54
struct in6_addr, inet_pton(),
55
connect() */
64
56
#include <assert.h> /* assert() */
65
57
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
58
#include <time.h> /* time() */
67
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
60
SIOCSIFFLAGS, if_indextoname(),
69
61
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
63
getuid(), getgid(), setuid(),
64
setgid() */
65
#include <netinet/in.h>
76
66
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
67
#include <iso646.h> /* not, and */
78
68
#include <argp.h> /* struct argp_option, error_t, struct
79
69
argp_state, struct argp,
80
70
argp_parse(), ARGP_KEY_ARG,
81
71
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
72
92
73
/* Avahi */
93
74
/* All Avahi types, constants and functions
101
82
#include <avahi-common/error.h>
102
83
103
84
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
106
86
gnutls_*
107
87
init_gnutls_session(),
108
88
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
111
90
GNUTLS_OPENPGP_FMT_BASE64 */
112
91
113
92
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
93
#include <gpgme.h> /* All GPGME types, constants and functions
116
94
gpgme_*
117
95
GPGME_PROTOCOL_OpenPGP,
118
96
GPG_ERR_NO_* */
119
97
120
98
#define BUFFER_SIZE 256
121
99
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
126
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
127
102
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
103
const char *argp_program_version = "mandosclient 1.0";
129
104
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
105
133
106
/* Used for passing in values through the Avahi callback functions */
134
107
typedef struct {
138
111
unsigned int dh_bits;
139
112
gnutls_dh_params_t dh_params;
140
113
const char *priority;
141
gpgme_ctx_t ctx;
142
114
} mandos_context;
143
115
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
116
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
155
119
* "buffer_length" is how much is already used.
156
120
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
122
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
160
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
125
if (buffer == NULL){
162
126
return 0;
163
127
}
164
128
buffer_capacity += BUFFER_SIZE;
167
131
}
168
132
169
133
/*
170
* Initialize GPGME.
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
171
136
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
gpgme_ctx_t ctx;
174
143
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
175
147
gpgme_engine_info_t engine_info;
176
148
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");
149
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
216
151
}
217
152
218
153
/* Init GPGME */
219
154
gpgme_check_version(NULL);
220
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
if(rc != GPG_ERR_NO_ERROR){
156
if (rc != GPG_ERR_NO_ERROR){
222
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
158
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
159
return -1;
225
160
}
226
161
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){
162
/* Set GPGME home directory for the OpenPGP engine only */
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
230
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
166
gpgme_strsource(rc), gpgme_strerror(rc));
232
return false;
167
return -1;
233
168
}
234
169
while(engine_info != NULL){
235
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
236
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
237
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
238
173
break;
239
174
}
240
175
engine_info = engine_info->next;
241
176
}
242
177
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");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
return -1;
277
180
}
278
181
279
182
/* Create new GPGME data buffer from memory cryptotext */
280
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
184
0);
282
if(rc != GPG_ERR_NO_ERROR){
185
if (rc != GPG_ERR_NO_ERROR){
283
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
187
gpgme_strsource(rc), gpgme_strerror(rc));
285
188
return -1;
287
190
288
191
/* Create new empty GPGME data buffer for the plaintext */
289
192
rc = gpgme_data_new(&dh_plain);
290
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
291
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
195
gpgme_strsource(rc), gpgme_strerror(rc));
293
196
gpgme_data_release(dh_crypto);
294
197
return -1;
295
198
}
296
199
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
297
209
/* Decrypt data from the cryptotext data buffer to the plaintext
298
210
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
301
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
214
gpgme_strsource(rc), gpgme_strerror(rc));
303
215
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;
216
goto decrypt_end;
217
}
218
219
if(debug){
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
221
}
222
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
319
239
while(recipient != NULL){
320
240
fprintf(stderr, "Public key algorithm: %s\n",
321
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
327
247
}
328
248
}
329
249
}
330
goto decrypt_end;
331
}
332
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
335
250
}
336
251
337
252
/* 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");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
340
255
plaintext_length = -1;
341
256
goto decrypt_end;
342
257
}
343
258
344
259
*plaintext = NULL;
345
260
while(true){
346
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
347
262
(size_t)plaintext_length,
348
263
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
351
266
plaintext_length = -1;
352
267
goto decrypt_end;
353
268
}
355
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
271
BUFFER_SIZE);
357
272
/* Print the data, if any */
358
if(ret == 0){
273
if (ret == 0){
359
274
/* EOF */
360
275
break;
361
276
}
366
281
}
367
282
plaintext_length += ret;
368
283
}
369
284
370
285
if(debug){
371
286
fprintf(stderr, "Decrypted password is: ");
372
287
for(ssize_t i = 0; i < plaintext_length; i++){
385
300
return plaintext_length;
386
301
}
387
302
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)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
392
306
ret = "(unknown)";
393
307
return ret;
394
308
}
399
313
fprintf(stderr, "GnuTLS: %s", string);
400
314
}
401
315
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
404
319
int ret;
405
320
406
321
if(debug){
408
323
}
409
324
410
325
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
414
329
return -1;
415
330
}
416
331
417
if(debug){
332
if (debug){
418
333
/* "Use a log level over 10 to enable all debugging options."
419
334
* - GnuTLS manual
420
335
*/
423
338
}
424
339
425
340
/* 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();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
434
346
return -1;
435
347
}
436
348
437
349
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
441
353
}
442
354
443
355
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
447
358
fprintf(stderr,
448
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
451
362
safer_gnutls_strerror(ret));
452
363
goto globalfail;
453
364
}
454
365
455
366
/* 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
367
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
371
goto globalfail;
372
}
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
377
goto globalfail;
378
}
379
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
381
471
382
return 0;
472
383
473
384
globalfail:
474
475
gnutls_certificate_free_credentials(mc.cred);
385
386
gnutls_certificate_free_credentials(mc->cred);
476
387
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
478
388
return -1;
389
479
390
}
480
391
481
static int init_gnutls_session(gnutls_session_t *session){
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
482
394
int ret;
483
395
/* 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){
396
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
491
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
399
safer_gnutls_strerror(ret));
493
400
}
494
401
495
402
{
496
403
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){
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
505
406
fprintf(stderr, "Syntax error at: %s\n", err);
506
407
fprintf(stderr, "GnuTLS error: %s\n",
507
408
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
409
gnutls_deinit (*session);
509
410
return -1;
510
411
}
511
412
}
512
413
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){
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
415
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
522
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
418
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
419
gnutls_deinit (*session);
525
420
return -1;
526
421
}
527
422
528
423
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
530
426
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
532
428
533
429
return 0;
534
430
}
540
436
/* Called when a Mandos server is found */
541
437
static int start_mandos_communication(const char *ip, uint16_t port,
542
438
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;
439
mandos_context *mc){
440
int ret, tcp_sd;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
550
442
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
443
char *decrypted_buffer;
552
444
size_t buffer_length = 0;
553
445
size_t buffer_capacity = 0;
446
ssize_t decrypted_buffer_size;
554
447
size_t written;
555
int retval = -1;
448
int retval = 0;
449
char interface[IF_NAMESIZE];
556
450
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){
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
581
454
return -1;
582
455
}
583
456
584
457
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
587
460
}
588
461
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
463
if(tcp_sd < 0) {
592
464
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;
465
return -1;
466
}
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
471
return -1;
472
}
473
fprintf(stderr, "Binding to interface %s\n", interface);
474
}
475
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
481
if (ret < 0 ){
612
482
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
483
return -1;
615
484
}
616
485
if(ret == 0){
617
int e = errno;
618
486
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
}
487
return -1;
488
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
644
490
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
491
to.in6.sin6_scope_id = (uint32_t)if_index;
649
492
650
493
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){
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
674
498
perror("inet_ntop");
675
499
} else {
676
500
if(strcmp(addrstr, ip) != 0){
679
503
}
680
504
}
681
505
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;
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
694
508
perror("connect");
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
702
}
703
509
return -1;
510
}
511
704
512
const char *out = mandos_protocol_version;
705
513
written = 0;
706
while(true){
514
while (true){
707
515
size_t out_size = strlen(out);
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
709
517
out_size - written));
710
if(ret == -1){
711
int e = errno;
518
if (ret == -1){
712
519
perror("write");
713
errno = e;
520
retval = -1;
714
521
goto mandos_end;
715
522
}
716
523
written += (size_t)ret;
717
524
if(written < out_size){
718
525
continue;
719
526
} else {
720
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
721
528
written = 0;
722
529
out = "\r\n";
723
530
} else {
724
531
break;
725
532
}
726
533
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
732
534
}
733
535
734
536
if(debug){
735
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
736
538
}
737
539
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
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
756
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
757
545
758
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
759
547
if(debug){
760
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
761
gnutls_perror(ret);
549
gnutls_perror (ret);
762
550
}
763
errno = EPROTO;
551
retval = -1;
764
552
goto mandos_end;
765
553
}
766
554
767
555
/* Read OpenPGP packet that contains the wanted password */
768
556
769
557
if(debug){
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
771
559
ip);
772
560
}
773
561
774
562
while(true){
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
782
564
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){
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){
798
574
break;
799
575
}
800
if(sret < 0){
801
switch(sret){
576
if (ret < 0){
577
switch(ret){
802
578
case GNUTLS_E_INTERRUPTED:
803
579
case GNUTLS_E_AGAIN:
804
580
break;
805
581
case GNUTLS_E_REHANDSHAKE:
806
do {
807
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
582
do{
583
ret = gnutls_handshake (session);
813
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
if(ret < 0){
585
if (ret < 0){
815
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
816
gnutls_perror(ret);
817
errno = EPROTO;
587
gnutls_perror (ret);
588
retval = -1;
818
589
goto mandos_end;
819
590
}
820
591
break;
821
592
default:
822
593
fprintf(stderr, "Unknown error while reading data from"
823
594
" encrypted session with Mandos server\n");
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
826
597
goto mandos_end;
827
598
}
828
599
} else {
829
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
830
601
}
831
602
}
832
603
834
605
fprintf(stderr, "Closing TLS session\n");
835
606
}
836
607
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;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
852
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
612
buffer_length,
854
&decrypted_buffer);
855
if(decrypted_buffer_size >= 0){
856
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
857
616
written = 0;
858
617
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);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
867
621
if(ret == 0 and ferror(stdout)){
868
int e = errno;
869
622
if(debug){
870
623
fprintf(stderr, "Error writing encrypted data: %s\n",
871
624
strerror(errno));
872
625
}
873
errno = e;
874
goto mandos_end;
626
retval = -1;
627
break;
875
628
}
876
629
written += (size_t)ret;
877
630
}
878
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
879
634
}
880
635
}
881
636
882
637
/* Shutdown procedure */
883
638
884
639
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;
901
retval = -1;
902
}
903
errno = e;
904
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
905
643
return retval;
906
644
}
907
645
908
646
static void resolve_callback(AvahiSServiceResolver *r,
909
647
AvahiIfIndex interface,
910
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
911
649
AvahiResolverEvent event,
912
650
const char *name,
913
651
const char *type,
918
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
919
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
658
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
923
662
924
663
/* Called whenever a service has been resolved successfully or
925
664
timed out */
926
665
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
666
switch (event) {
932
667
default:
933
668
case AVAHI_RESOLVER_FAILURE:
934
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
937
672
break;
938
673
939
674
case AVAHI_RESOLVER_FOUND:
941
676
char ip[AVAHI_ADDRESS_STR_MAX];
942
677
avahi_address_snprint(ip, sizeof(ip), address);
943
678
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);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
947
681
}
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);
682
int ret = start_mandos_communication(ip, port, interface, mc);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
952
685
}
953
686
}
954
687
}
955
688
avahi_s_service_resolver_free(r);
956
689
}
957
690
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);
691
static void browse_callback( AvahiSServiceBrowser *b,
692
AvahiIfIndex interface,
693
AvahiProtocol protocol,
694
AvahiBrowserEvent event,
695
const char *name,
696
const char *type,
697
const char *domain,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
699
flags,
700
void* userdata) {
701
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
969
703
970
704
/* Called whenever a new services becomes available on the LAN or
971
705
is removed from the LAN */
972
706
973
if(quit_now){
974
return;
975
}
976
977
switch(event){
707
switch (event) {
978
708
default:
979
709
case AVAHI_BROWSER_FAILURE:
980
710
981
711
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
984
714
return;
985
715
986
716
case AVAHI_BROWSER_NEW:
989
719
the callback function is called the Avahi server will free the
990
720
resolver for us. */
991
721
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
724
AVAHI_PROTO_INET6, 0,
725
resolve_callback, mc)))
995
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
727
name, avahi_strerror(avahi_server_errno(mc->server)));
997
728
break;
998
729
999
730
case AVAHI_BROWSER_REMOVE:
1008
739
}
1009
740
}
1010
741
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;
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
1023
760
}
1024
761
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
762
1120
763
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
};
1212
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;
1265
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);
764
AvahiSServiceBrowser *sb = NULL;
765
int error;
766
int ret;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
780
781
{
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
788
.group = 1 },
789
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
808
.group = 2 },
809
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
812
{ .name = NULL }
813
};
814
815
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
822
debug = true;
823
break;
824
case 'c':
825
connect_to = arg;
826
break;
827
case 'i':
828
interface = arg;
829
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
844
exit(EXIT_FAILURE);
845
}
846
break;
847
case 130:
848
mc.priority = arg;
849
break;
850
case ARGP_KEY_ARG:
851
argp_usage (state);
852
break;
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, "Unkown error while parsing arguments\n");
1309
868
exitcode = EXIT_FAILURE;
1310
869
goto end;
1311
870
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
1316
876
exitcode = EXIT_FAILURE;
1317
877
goto end;
1318
878
}
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){
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
uid = getuid();
895
gid = getgid();
896
897
ret = setuid(uid);
898
if (ret == -1){
899
perror("setuid");
900
}
901
902
setgid(gid);
903
if (ret == -1){
904
perror("setgid");
905
}
906
1397
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
908
if(if_index == 0){
1399
909
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__ */
1425
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
1428
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;
1445
}
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
if(ret == -1){
1449
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;
1466
}
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
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++){
910
exit(EXIT_FAILURE);
911
}
912
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
917
if(address == NULL){
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
920
goto end;
921
}
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
*address = '\0';
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
932
if(ret < 0){
933
exitcode = EXIT_FAILURE;
934
} else {
935
exitcode = EXIT_SUCCESS;
936
}
937
goto end;
938
}
939
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
1494
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
950
if(ret == -1){
1496
951
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 */
1656
avahi_server_config_init(&config);
1657
config.publish_hinfo = 0;
1658
config.publish_addresses = 0;
1659
config.publish_workstation = 0;
1660
config.publish_domain = 0;
1661
1662
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
1666
1667
/* Free the Avahi configuration data */
1668
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
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
}
964
close(sd);
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1706
1029
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;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
1828
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0