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- Committer: Teddy Hogeborn
- Date: 2008-08-12 06:46:11 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812064611-7wfjg391ypmff085
* mandos-keygen: New program to generate new client keys on
installation.
* Makefile (all): No longer build documentation.
(doc): New; build documentation.
(maintainer-clean): Remove build-local client keydir.
(run-client): Make build-local keydir with keys.
(run-server): Do not depend on "all".
(install, install-server, install-client, uninstall,
uninstall-server, uninstall-client, purge, purge-server,
purge-client): New.
installation.
* Makefile (all): No longer build documentation.
(doc): New; build documentation.
(maintainer-clean): Remove build-local client keydir.
(run-client): Make build-local keydir with keys.
(run-server): Do not depend on "all".
(install, install-server, install-client, uninstall,
uninstall-server, uninstall-client, purge, purge-server,
purge-client): New.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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 */
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(), sleep() */
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() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
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
#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
71
92
72
/* Avahi */
93
73
/* All Avahi types, constants and functions
101
81
#include <avahi-common/error.h>
102
82
103
83
/* GnuTLS */
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
106
85
gnutls_*
107
86
init_gnutls_session(),
108
87
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
111
89
GNUTLS_OPENPGP_FMT_BASE64 */
112
90
113
91
/* GPGME */
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
116
93
gpgme_*
117
94
GPGME_PROTOCOL_OpenPGP,
118
95
GPG_ERR_NO_* */
119
96
120
97
#define BUFFER_SIZE 256
121
98
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
126
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
127
101
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
129
103
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
104
133
105
/* Used for passing in values through the Avahi callback functions */
134
106
typedef struct {
138
110
unsigned int dh_bits;
139
111
gnutls_dh_params_t dh_params;
140
112
const char *priority;
141
gpgme_ctx_t ctx;
142
113
} mandos_context;
143
114
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
115
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* 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,
155
118
* "buffer_length" is how much is already used.
156
119
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
121
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
160
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
124
if (buffer == NULL){
162
125
return 0;
163
126
}
164
127
buffer_capacity += BUFFER_SIZE;
167
130
}
168
131
169
132
/*
170
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
171
135
*/
172
static bool init_gpgme(const char *seckey,
173
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;
174
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
175
146
gpgme_engine_info_t engine_info;
176
147
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");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
216
150
}
217
151
218
152
/* Init GPGME */
219
153
gpgme_check_version(NULL);
220
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
222
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
157
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
158
return -1;
225
159
}
226
160
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){
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){
230
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
165
gpgme_strsource(rc), gpgme_strerror(rc));
232
return false;
166
return -1;
233
167
}
234
168
while(engine_info != NULL){
235
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
236
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
237
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
238
172
break;
239
173
}
240
174
engine_info = engine_info->next;
241
175
}
242
176
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");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
277
179
}
278
180
279
181
/* Create new GPGME data buffer from memory cryptotext */
280
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
183
0);
282
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
283
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
186
gpgme_strsource(rc), gpgme_strerror(rc));
285
187
return -1;
287
189
288
190
/* Create new empty GPGME data buffer for the plaintext */
289
191
rc = gpgme_data_new(&dh_plain);
290
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
291
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
194
gpgme_strsource(rc), gpgme_strerror(rc));
293
195
gpgme_data_release(dh_crypto);
294
196
return -1;
295
197
}
296
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
297
208
/* Decrypt data from the cryptotext data buffer to the plaintext
298
209
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
301
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
213
gpgme_strsource(rc), gpgme_strerror(rc));
303
214
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;
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){
319
238
while(recipient != NULL){
320
239
fprintf(stderr, "Public key algorithm: %s\n",
321
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
327
246
}
328
247
}
329
248
}
330
goto decrypt_end;
331
}
332
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
335
249
}
336
250
337
251
/* 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");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
340
254
plaintext_length = -1;
341
255
goto decrypt_end;
342
256
}
343
257
344
258
*plaintext = NULL;
345
259
while(true){
346
plaintext_capacity = incbuffer(plaintext,
260
plaintext_capacity = adjustbuffer(plaintext,
347
261
(size_t)plaintext_length,
348
262
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
351
265
plaintext_length = -1;
352
266
goto decrypt_end;
353
267
}
355
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
270
BUFFER_SIZE);
357
271
/* Print the data, if any */
358
if(ret == 0){
272
if (ret == 0){
359
273
/* EOF */
360
274
break;
361
275
}
366
280
}
367
281
plaintext_length += ret;
368
282
}
369
283
370
284
if(debug){
371
285
fprintf(stderr, "Decrypted password is: ");
372
286
for(ssize_t i = 0; i < plaintext_length; i++){
385
299
return plaintext_length;
386
300
}
387
301
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)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
392
305
ret = "(unknown)";
393
306
return ret;
394
307
}
399
312
fprintf(stderr, "GnuTLS: %s", string);
400
313
}
401
314
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
404
318
int ret;
405
319
406
320
if(debug){
408
322
}
409
323
410
324
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
414
328
return -1;
415
329
}
416
330
417
if(debug){
331
if (debug){
418
332
/* "Use a log level over 10 to enable all debugging options."
419
333
* - GnuTLS manual
420
334
*/
423
337
}
424
338
425
339
/* OpenPGP credentials */
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n",
429
safer_gnutls_strerror(ret));
430
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 ();
431
345
return -1;
432
346
}
433
347
434
348
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
438
352
}
439
353
440
354
ret = gnutls_certificate_set_openpgp_key_file
441
(mc.cred, pubkeyfilename, seckeyfilename,
442
GNUTLS_OPENPGP_FMT_BASE64);
443
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
444
357
fprintf(stderr,
445
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
448
361
safer_gnutls_strerror(ret));
449
362
goto globalfail;
450
363
}
451
364
452
365
/* GnuTLS server initialization */
453
ret = gnutls_dh_params_init(&mc.dh_params);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
457
goto globalfail;
458
}
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
463
goto globalfail;
464
}
465
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
467
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
468
381
return 0;
469
382
470
383
globalfail:
471
472
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
473
386
gnutls_global_deinit();
474
gnutls_dh_params_deinit(mc.dh_params);
475
387
return -1;
388
476
389
}
477
390
478
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
479
393
int ret;
480
394
/* GnuTLS session creation */
481
do {
482
ret = gnutls_init(session, GNUTLS_SERVER);
483
if(quit_now){
484
return -1;
485
}
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
if(ret != GNUTLS_E_SUCCESS){
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
488
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
398
safer_gnutls_strerror(ret));
490
399
}
491
400
492
401
{
493
402
const char *err;
494
do {
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
496
if(quit_now){
497
gnutls_deinit(*session);
498
return -1;
499
}
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
if(ret != GNUTLS_E_SUCCESS){
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
502
405
fprintf(stderr, "Syntax error at: %s\n", err);
503
406
fprintf(stderr, "GnuTLS error: %s\n",
504
407
safer_gnutls_strerror(ret));
505
gnutls_deinit(*session);
408
gnutls_deinit (*session);
506
409
return -1;
507
410
}
508
411
}
509
412
510
do {
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
512
mc.cred);
513
if(quit_now){
514
gnutls_deinit(*session);
515
return -1;
516
}
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
if(ret != GNUTLS_E_SUCCESS){
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
519
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
417
safer_gnutls_strerror(ret));
521
gnutls_deinit(*session);
418
gnutls_deinit (*session);
522
419
return -1;
523
420
}
524
421
525
422
/* ignore client certificate if any. */
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
527
425
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
427
530
428
return 0;
531
429
}
537
435
/* Called when a Mandos server is found */
538
436
static int start_mandos_communication(const char *ip, uint16_t port,
539
437
AvahiIfIndex if_index,
540
int af){
541
int ret, tcp_sd = -1;
542
ssize_t sret;
543
union {
544
struct sockaddr_in in;
545
struct sockaddr_in6 in6;
546
} to;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
547
441
char *buffer = NULL;
548
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
549
443
size_t buffer_length = 0;
550
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
551
446
size_t written;
552
int retval = -1;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
553
449
gnutls_session_t session;
554
int pf; /* Protocol family */
555
556
errno = 0;
557
558
if(quit_now){
559
errno = EINTR;
560
return -1;
561
}
562
563
switch(af){
564
case AF_INET6:
565
pf = PF_INET6;
566
break;
567
case AF_INET:
568
pf = PF_INET;
569
break;
570
default:
571
fprintf(stderr, "Bad address family: %d\n", af);
572
errno = EINVAL;
573
return -1;
574
}
575
576
ret = init_gnutls_session(&session);
577
if(ret != 0){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
578
453
return -1;
579
454
}
580
455
581
456
if(debug){
582
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
583
458
"\n", ip, port);
584
459
}
585
460
586
tcp_sd = socket(pf, SOCK_STREAM, 0);
587
if(tcp_sd < 0){
588
int e = errno;
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
589
463
perror("socket");
590
errno = e;
591
goto mandos_end;
592
}
593
594
if(quit_now){
595
errno = EINTR;
596
goto mandos_end;
597
}
598
599
memset(&to, 0, sizeof(to));
600
if(af == AF_INET6){
601
to.in6.sin6_family = (sa_family_t)af;
602
ret = inet_pton(af, ip, &to.in6.sin6_addr);
603
} else { /* IPv4 */
604
to.in.sin_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in.sin_addr);
606
}
607
if(ret < 0 ){
608
int e = errno;
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 ){
609
481
perror("inet_pton");
610
errno = e;
611
goto mandos_end;
482
return -1;
612
483
}
613
484
if(ret == 0){
614
int e = errno;
615
485
fprintf(stderr, "Bad address: %s\n", ip);
616
errno = e;
617
goto mandos_end;
618
}
619
if(af == AF_INET6){
620
to.in6.sin6_port = htons(port); /* Spurious warnings from
621
-Wconversion and
622
-Wunreachable-code */
623
624
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
625
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
626
-Wunreachable-code*/
627
if(if_index == AVAHI_IF_UNSPEC){
628
fprintf(stderr, "An IPv6 link-local address is incomplete"
629
" without a network interface\n");
630
errno = EINVAL;
631
goto mandos_end;
632
}
633
/* Set the network interface number as scope */
634
to.in6.sin6_scope_id = (uint32_t)if_index;
635
}
636
} else {
637
to.in.sin_port = htons(port); /* Spurious warnings from
638
-Wconversion and
639
-Wunreachable-code */
640
}
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
641
489
642
if(quit_now){
643
errno = EINTR;
644
goto mandos_end;
645
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
646
491
647
492
if(debug){
648
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
649
char interface[IF_NAMESIZE];
650
if(if_indextoname((unsigned int)if_index, interface) == NULL){
651
perror("if_indextoname");
652
} else {
653
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
654
ip, interface, port);
655
}
656
} else {
657
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
658
port);
659
}
660
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
661
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
662
const char *pcret;
663
if(af == AF_INET6){
664
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
665
sizeof(addrstr));
666
} else {
667
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
668
sizeof(addrstr));
669
}
670
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){
671
498
perror("inet_ntop");
672
499
} else {
673
500
if(strcmp(addrstr, ip) != 0){
676
503
}
677
504
}
678
505
679
if(quit_now){
680
errno = EINTR;
681
goto mandos_end;
682
}
683
684
if(af == AF_INET6){
685
ret = connect(tcp_sd, &to.in6, sizeof(to));
686
} else {
687
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
688
}
689
if(ret < 0){
690
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
}
695
goto mandos_end;
696
}
697
698
if(quit_now){
699
errno = EINTR;
700
goto mandos_end;
701
}
702
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
508
perror("connect");
509
return -1;
510
}
511
703
512
const char *out = mandos_protocol_version;
704
513
written = 0;
705
while(true){
514
while (true){
706
515
size_t out_size = strlen(out);
707
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
708
517
out_size - written));
709
if(ret == -1){
710
int e = errno;
518
if (ret == -1){
711
519
perror("write");
712
errno = e;
520
retval = -1;
713
521
goto mandos_end;
714
522
}
715
523
written += (size_t)ret;
716
524
if(written < out_size){
717
525
continue;
718
526
} else {
719
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
720
528
written = 0;
721
529
out = "\r\n";
722
530
} else {
723
531
break;
724
532
}
725
533
}
726
727
if(quit_now){
728
errno = EINTR;
729
goto mandos_end;
730
}
731
534
}
732
535
733
536
if(debug){
734
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
735
538
}
736
539
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
743
744
if(quit_now){
745
errno = EINTR;
746
goto mandos_end;
747
}
748
749
do {
750
ret = gnutls_handshake(session);
751
if(quit_now){
752
errno = EINTR;
753
goto mandos_end;
754
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
755
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
756
545
757
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
758
547
if(debug){
759
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
760
gnutls_perror(ret);
549
gnutls_perror (ret);
761
550
}
762
errno = EPROTO;
551
retval = -1;
763
552
goto mandos_end;
764
553
}
765
554
766
555
/* Read OpenPGP packet that contains the wanted password */
767
556
768
557
if(debug){
769
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
770
559
ip);
771
560
}
772
561
773
562
while(true){
774
775
if(quit_now){
776
errno = EINTR;
777
goto mandos_end;
778
}
779
780
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
781
564
buffer_capacity);
782
if(buffer_capacity == 0){
783
int e = errno;
784
perror("incbuffer");
785
errno = e;
786
goto mandos_end;
787
}
788
789
if(quit_now){
790
errno = EINTR;
791
goto mandos_end;
792
}
793
794
sret = gnutls_record_recv(session, buffer+buffer_length,
795
BUFFER_SIZE);
796
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){
797
574
break;
798
575
}
799
if(sret < 0){
800
switch(sret){
576
if (ret < 0){
577
switch(ret){
801
578
case GNUTLS_E_INTERRUPTED:
802
579
case GNUTLS_E_AGAIN:
803
580
break;
804
581
case GNUTLS_E_REHANDSHAKE:
805
do {
806
ret = gnutls_handshake(session);
807
808
if(quit_now){
809
errno = EINTR;
810
goto mandos_end;
811
}
582
do{
583
ret = gnutls_handshake (session);
812
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
if(ret < 0){
585
if (ret < 0){
814
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
815
gnutls_perror(ret);
816
errno = EPROTO;
587
gnutls_perror (ret);
588
retval = -1;
817
589
goto mandos_end;
818
590
}
819
591
break;
820
592
default:
821
593
fprintf(stderr, "Unknown error while reading data from"
822
594
" encrypted session with Mandos server\n");
823
gnutls_bye(session, GNUTLS_SHUT_RDWR);
824
errno = EIO;
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
825
597
goto mandos_end;
826
598
}
827
599
} else {
828
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
829
601
}
830
602
}
831
603
833
605
fprintf(stderr, "Closing TLS session\n");
834
606
}
835
607
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
do {
842
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
846
}
847
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
848
849
if(buffer_length > 0){
850
ssize_t decrypted_buffer_size;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
851
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
852
612
buffer_length,
853
&decrypted_buffer);
854
if(decrypted_buffer_size >= 0){
855
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
856
616
written = 0;
857
617
while(written < (size_t) decrypted_buffer_size){
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
ret = (int)fwrite(decrypted_buffer + written, 1,
864
(size_t)decrypted_buffer_size - written,
865
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
866
621
if(ret == 0 and ferror(stdout)){
867
int e = errno;
868
622
if(debug){
869
623
fprintf(stderr, "Error writing encrypted data: %s\n",
870
624
strerror(errno));
871
625
}
872
errno = e;
873
goto mandos_end;
626
retval = -1;
627
break;
874
628
}
875
629
written += (size_t)ret;
876
630
}
877
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
878
634
}
879
635
}
880
636
881
637
/* Shutdown procedure */
882
638
883
639
mandos_end:
884
{
885
int e = errno;
886
free(decrypted_buffer);
887
free(buffer);
888
if(tcp_sd >= 0){
889
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
890
}
891
if(ret == -1){
892
if(e == 0){
893
e = errno;
894
}
895
perror("close");
896
}
897
gnutls_deinit(session);
898
if(quit_now){
899
e = EINTR;
900
retval = -1;
901
}
902
errno = e;
903
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
904
643
return retval;
905
644
}
906
645
907
646
static void resolve_callback(AvahiSServiceResolver *r,
908
647
AvahiIfIndex interface,
909
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
910
649
AvahiResolverEvent event,
911
650
const char *name,
912
651
const char *type,
917
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
918
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
919
658
flags,
920
AVAHI_GCC_UNUSED void* userdata){
921
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
922
662
923
663
/* Called whenever a service has been resolved successfully or
924
664
timed out */
925
665
926
if(quit_now){
927
return;
928
}
929
930
switch(event){
666
switch (event) {
931
667
default:
932
668
case AVAHI_RESOLVER_FAILURE:
933
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
934
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
935
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
936
672
break;
937
673
938
674
case AVAHI_RESOLVER_FOUND:
941
677
avahi_address_snprint(ip, sizeof(ip), address);
942
678
if(debug){
943
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
944
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
945
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
946
682
}
947
int ret = start_mandos_communication(ip, port, interface,
948
avahi_proto_to_af(proto));
949
if(ret == 0){
950
avahi_simple_poll_quit(mc.simple_poll);
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
951
686
}
952
687
}
953
688
}
954
689
avahi_s_service_resolver_free(r);
955
690
}
956
691
957
static void browse_callback(AvahiSServiceBrowser *b,
958
AvahiIfIndex interface,
959
AvahiProtocol protocol,
960
AvahiBrowserEvent event,
961
const char *name,
962
const char *type,
963
const char *domain,
964
AVAHI_GCC_UNUSED AvahiLookupResultFlags
965
flags,
966
AVAHI_GCC_UNUSED void* userdata){
967
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 */
968
704
969
705
/* Called whenever a new services becomes available on the LAN or
970
706
is removed from the LAN */
971
707
972
if(quit_now){
973
return;
974
}
975
976
switch(event){
708
switch (event) {
977
709
default:
978
710
case AVAHI_BROWSER_FAILURE:
979
711
980
712
fprintf(stderr, "(Avahi browser) %s\n",
981
avahi_strerror(avahi_server_errno(mc.server)));
982
avahi_simple_poll_quit(mc.simple_poll);
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
983
715
return;
984
716
985
717
case AVAHI_BROWSER_NEW:
988
720
the callback function is called the Avahi server will free the
989
721
resolver for us. */
990
722
991
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
992
name, type, domain, protocol, 0,
993
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)))
994
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
995
name, avahi_strerror(avahi_server_errno(mc.server)));
728
name, avahi_strerror(avahi_server_errno(mc->server)));
996
729
break;
997
730
998
731
case AVAHI_BROWSER_REMOVE:
1007
740
}
1008
741
}
1009
742
1010
/* stop main loop after sigterm has been called */
1011
static void handle_sigterm(int sig){
1012
if(quit_now){
1013
return;
1014
}
1015
quit_now = 1;
1016
signal_received = sig;
1017
int old_errno = errno;
1018
if(mc.simple_poll != NULL){
1019
avahi_simple_poll_quit(mc.simple_poll);
1020
}
1021
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;
1022
761
}
1023
762
1024
/*
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
1027
* (This function is passed to scandir(3) as a filter function.)
1028
*/
1029
int good_interface(const struct dirent *if_entry){
1030
ssize_t ssret;
1031
char *flagname = NULL;
1032
if(if_entry->d_name[0] == '.'){
1033
return 0;
1034
}
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1042
if(flags_fd == -1){
1043
perror("open");
1044
free(flagname);
1045
return 0;
1046
}
1047
free(flagname);
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1054
perror("malloc");
1055
close(flags_fd);
1056
return 0;
1057
}
1058
while(to_read > 0){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1060
(size_t)to_read));
1061
if(ssret == -1){
1062
perror("read");
1063
free(flagstring);
1064
close(flags_fd);
1065
return 0;
1066
}
1067
to_read -= ssret;
1068
if(ssret == 0){
1069
break;
1070
}
1071
}
1072
close(flags_fd);
1073
intmax_t tmpmax;
1074
char *tmp;
1075
errno = 0;
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1080
if(debug){
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1083
}
1084
free(flagstring);
1085
return 0;
1086
}
1087
free(flagstring);
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1089
/* Reject the loopback device */
1090
if(flags & IFF_LOOPBACK){
1091
if(debug){
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1093
if_entry->d_name);
1094
}
1095
return 0;
1096
}
1097
/* Accept point-to-point devices only if connect_to is specified */
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1099
if(debug){
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1101
if_entry->d_name);
1102
}
1103
return 1;
1104
}
1105
/* Otherwise, reject non-broadcast-capable devices */
1106
if(not (flags & IFF_BROADCAST)){
1107
if(debug){
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1109
if_entry->d_name);
1110
}
1111
return 0;
1112
}
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1114
if(flags & IFF_NOARP){
1115
if(debug){
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1117
if_entry->d_name);
1118
}
1119
return 0;
1120
}
1121
/* Accept this device */
1122
if(debug){
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1124
if_entry->d_name);
1125
}
1126
return 1;
1127
}
1128
763
1129
764
int main(int argc, char *argv[]){
1130
AvahiSServiceBrowser *sb = NULL;
1131
int error;
1132
int ret;
1133
intmax_t tmpmax;
1134
char *tmp;
1135
int exitcode = EXIT_SUCCESS;
1136
const char *interface = "";
1137
struct ifreq network;
1138
int sd = -1;
1139
bool take_down_interface = false;
1140
uid_t uid;
1141
gid_t gid;
1142
char tempdir[] = "/tmp/mandosXXXXXX";
1143
bool tempdir_created = false;
1144
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1145
const char *seckey = PATHDIR "/" SECKEY;
1146
const char *pubkey = PATHDIR "/" PUBKEY;
1147
1148
bool gnutls_initialized = false;
1149
bool gpgme_initialized = false;
1150
float delay = 2.5f;
1151
1152
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1153
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1154
1155
uid = getuid();
1156
gid = getgid();
1157
1158
/* Lower any group privileges we might have, just to be safe */
1159
errno = 0;
1160
ret = setgid(gid);
1161
if(ret == -1){
1162
perror("setgid");
1163
}
1164
1165
/* Lower user privileges (temporarily) */
1166
errno = 0;
1167
ret = seteuid(uid);
1168
if(ret == -1){
1169
perror("seteuid");
1170
}
1171
1172
if(quit_now){
1173
goto end;
1174
}
1175
1176
{
1177
struct argp_option options[] = {
1178
{ .name = "debug", .key = 128,
1179
.doc = "Debug mode", .group = 3 },
1180
{ .name = "connect", .key = 'c',
1181
.arg = "ADDRESS:PORT",
1182
.doc = "Connect directly to a specific Mandos server",
1183
.group = 1 },
1184
{ .name = "interface", .key = 'i',
1185
.arg = "NAME",
1186
.doc = "Network interface that will be used to search for"
1187
" Mandos servers",
1188
.group = 1 },
1189
{ .name = "seckey", .key = 's',
1190
.arg = "FILE",
1191
.doc = "OpenPGP secret key file base name",
1192
.group = 1 },
1193
{ .name = "pubkey", .key = 'p',
1194
.arg = "FILE",
1195
.doc = "OpenPGP public key file base name",
1196
.group = 2 },
1197
{ .name = "dh-bits", .key = 129,
1198
.arg = "BITS",
1199
.doc = "Bit length of the prime number used in the"
1200
" Diffie-Hellman key exchange",
1201
.group = 2 },
1202
{ .name = "priority", .key = 130,
1203
.arg = "STRING",
1204
.doc = "GnuTLS priority string for the TLS handshake",
1205
.group = 1 },
1206
{ .name = "delay", .key = 131,
1207
.arg = "SECONDS",
1208
.doc = "Maximum delay to wait for interface startup",
1209
.group = 2 },
1210
/*
1211
* These reproduce what we would get without ARGP_NO_HELP
1212
*/
1213
{ .name = "help", .key = '?',
1214
.doc = "Give this help list", .group = -1 },
1215
{ .name = "usage", .key = -3,
1216
.doc = "Give a short usage message", .group = -1 },
1217
{ .name = "version", .key = 'V',
1218
.doc = "Print program version", .group = -1 },
1219
{ .name = NULL }
1220
};
1221
1222
error_t parse_opt(int key, char *arg,
1223
struct argp_state *state){
1224
errno = 0;
1225
switch(key){
1226
case 128: /* --debug */
1227
debug = true;
1228
break;
1229
case 'c': /* --connect */
1230
connect_to = arg;
1231
break;
1232
case 'i': /* --interface */
1233
interface = arg;
1234
break;
1235
case 's': /* --seckey */
1236
seckey = arg;
1237
break;
1238
case 'p': /* --pubkey */
1239
pubkey = arg;
1240
break;
1241
case 129: /* --dh-bits */
1242
errno = 0;
1243
tmpmax = strtoimax(arg, &tmp, 10);
1244
if(errno != 0 or tmp == arg or *tmp != '\0'
1245
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1246
argp_error(state, "Bad number of DH bits");
1247
}
1248
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1249
break;
1250
case 130: /* --priority */
1251
mc.priority = arg;
1252
break;
1253
case 131: /* --delay */
1254
errno = 0;
1255
delay = strtof(arg, &tmp);
1256
if(errno != 0 or tmp == arg or *tmp != '\0'){
1257
argp_error(state, "Bad delay");
1258
}
1259
break;
1260
/*
1261
* These reproduce what we would get without ARGP_NO_HELP
1262
*/
1263
case '?': /* --help */
1264
argp_state_help(state, state->out_stream,
1265
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1266
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1267
case -3: /* --usage */
1268
argp_state_help(state, state->out_stream,
1269
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1270
case 'V': /* --version */
1271
fprintf(state->out_stream, "%s\n", argp_program_version);
1272
exit(argp_err_exit_status);
1273
break;
1274
default:
1275
return ARGP_ERR_UNKNOWN;
1276
}
1277
return errno;
1278
}
1279
1280
struct argp argp = { .options = options, .parser = parse_opt,
1281
.args_doc = "",
1282
.doc = "Mandos client -- Get and decrypt"
1283
" passwords from a Mandos server" };
1284
ret = argp_parse(&argp, argc, argv,
1285
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1286
switch(ret){
1287
case 0:
1288
break;
1289
case ENOMEM:
1290
default:
1291
errno = ret;
1292
perror("argp_parse");
1293
exitcode = EX_OSERR;
1294
goto end;
1295
case EINVAL:
1296
exitcode = EX_USAGE;
1297
goto end;
1298
}
1299
}
1300
1301
if(not debug){
1302
avahi_set_log_function(empty_log);
1303
}
1304
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1308
alphasort);
1309
if(ret >= 1){
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1312
if(debug){
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1314
}
1315
if(interface == NULL){
1316
perror("malloc");
1317
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
break;
854
case ARGP_KEY_END:
855
break;
856
default:
857
return ARGP_ERR_UNKNOWN;
858
}
859
return 0;
860
}
861
862
struct argp argp = { .options = options, .parser = parse_opt,
863
.args_doc = "",
864
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
868
fprintf(stderr, "Unknown error while parsing arguments\n");
1318
869
exitcode = EXIT_FAILURE;
1319
870
goto end;
1320
871
}
1321
free(direntries);
872
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
1322
893
} else {
1323
free(direntries);
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
1326
goto end;
1327
}
1328
}
1329
1330
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1331
from the signal handler */
1332
/* Initialize the pseudo-RNG for Avahi */
1333
srand((unsigned int) time(NULL));
1334
mc.simple_poll = avahi_simple_poll_new();
1335
if(mc.simple_poll == NULL){
1336
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1337
exitcode = EX_UNAVAILABLE;
1338
goto end;
1339
}
1340
1341
sigemptyset(&sigterm_action.sa_mask);
1342
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1343
if(ret == -1){
1344
perror("sigaddset");
1345
exitcode = EX_OSERR;
1346
goto end;
1347
}
1348
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1349
if(ret == -1){
1350
perror("sigaddset");
1351
exitcode = EX_OSERR;
1352
goto end;
1353
}
1354
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1355
if(ret == -1){
1356
perror("sigaddset");
1357
exitcode = EX_OSERR;
1358
goto end;
1359
}
1360
/* Need to check if the handler is SIG_IGN before handling:
1361
| [[info:libc:Initial Signal Actions]] |
1362
| [[info:libc:Basic Signal Handling]] |
1363
*/
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1365
if(ret == -1){
1366
perror("sigaction");
1367
return EX_OSERR;
1368
}
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
1371
if(ret == -1){
1372
perror("sigaction");
1373
exitcode = EX_OSERR;
1374
goto end;
1375
}
1376
}
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1378
if(ret == -1){
1379
perror("sigaction");
1380
return EX_OSERR;
1381
}
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1384
if(ret == -1){
1385
perror("sigaction");
1386
exitcode = EX_OSERR;
1387
goto end;
1388
}
1389
}
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1391
if(ret == -1){
1392
perror("sigaction");
1393
return EX_OSERR;
1394
}
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1397
if(ret == -1){
1398
perror("sigaction");
1399
exitcode = EX_OSERR;
1400
goto end;
1401
}
1402
}
1403
1404
/* If the interface is down, bring it up */
1405
if(strcmp(interface, "none") != 0){
894
gnutls_initalized = true;
895
}
896
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
if(ret == -1){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
922
}
923
924
uid = getuid();
925
gid = getgid();
926
927
ret = setuid(uid);
928
if (ret == -1){
929
perror("setuid");
930
}
931
932
setgid(gid);
933
if (ret == -1){
934
perror("setgid");
935
}
936
1406
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
1407
938
if(if_index == 0){
1408
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1409
exitcode = EX_UNAVAILABLE;
1410
goto end;
1411
}
1412
1413
if(quit_now){
1414
goto end;
1415
}
1416
1417
/* Re-raise priviliges */
1418
errno = 0;
1419
ret = seteuid(0);
1420
if(ret == -1){
1421
perror("seteuid");
1422
}
1423
1424
#ifdef __linux__
1425
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1426
messages about the network interface to mess up the prompt */
1427
ret = klogctl(8, NULL, 5);
1428
bool restore_loglevel = true;
1429
if(ret == -1){
1430
restore_loglevel = false;
1431
perror("klogctl");
1432
}
1433
#endif /* __linux__ */
1434
1435
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1436
if(sd < 0){
1437
perror("socket");
1438
exitcode = EX_OSERR;
1439
#ifdef __linux__
1440
if(restore_loglevel){
1441
ret = klogctl(7, NULL, 0);
1442
if(ret == -1){
1443
perror("klogctl");
1444
}
1445
}
1446
#endif /* __linux__ */
1447
/* Lower privileges */
1448
errno = 0;
1449
ret = seteuid(uid);
1450
if(ret == -1){
1451
perror("seteuid");
1452
}
1453
goto end;
1454
}
1455
strcpy(network.ifr_name, interface);
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1457
if(ret == -1){
1458
perror("ioctl SIOCGIFFLAGS");
1459
#ifdef __linux__
1460
if(restore_loglevel){
1461
ret = klogctl(7, NULL, 0);
1462
if(ret == -1){
1463
perror("klogctl");
1464
}
1465
}
1466
#endif /* __linux__ */
1467
exitcode = EX_OSERR;
1468
/* Lower privileges */
1469
errno = 0;
1470
ret = seteuid(uid);
1471
if(ret == -1){
1472
perror("seteuid");
1473
}
1474
goto end;
1475
}
1476
if((network.ifr_flags & IFF_UP) == 0){
1477
network.ifr_flags |= IFF_UP;
1478
take_down_interface = true;
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1480
if(ret == -1){
1481
take_down_interface = false;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1484
#ifdef __linux__
1485
if(restore_loglevel){
1486
ret = klogctl(7, NULL, 0);
1487
if(ret == -1){
1488
perror("klogctl");
1489
}
1490
}
1491
#endif /* __linux__ */
1492
/* Lower privileges */
1493
errno = 0;
1494
ret = seteuid(uid);
1495
if(ret == -1){
1496
perror("seteuid");
1497
}
1498
goto end;
1499
}
1500
}
1501
/* sleep checking until interface is running */
1502
for(int i=0; i < delay * 4; i++){
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1504
if(ret == -1){
1505
perror("ioctl SIOCGIFFLAGS");
1506
} else if(network.ifr_flags & IFF_RUNNING){
1507
break;
1508
}
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1510
ret = nanosleep(&sleeptime, NULL);
1511
if(ret == -1 and errno != EINTR){
1512
perror("nanosleep");
1513
}
1514
}
1515
if(not take_down_interface){
1516
/* We won't need the socket anymore */
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1518
if(ret == -1){
1519
perror("close");
1520
}
1521
}
1522
#ifdef __linux__
1523
if(restore_loglevel){
1524
/* Restores kernel loglevel to default */
1525
ret = klogctl(7, NULL, 0);
1526
if(ret == -1){
1527
perror("klogctl");
1528
}
1529
}
1530
#endif /* __linux__ */
1531
/* Lower privileges */
1532
errno = 0;
1533
if(take_down_interface){
1534
/* Lower privileges */
1535
ret = seteuid(uid);
1536
if(ret == -1){
1537
perror("seteuid");
1538
}
1539
} else {
1540
/* Lower privileges permanently */
1541
ret = setuid(uid);
1542
if(ret == -1){
1543
perror("setuid");
1544
}
1545
}
1546
}
1547
1548
if(quit_now){
1549
goto end;
1550
}
1551
1552
ret = init_gnutls_global(pubkey, seckey);
1553
if(ret == -1){
1554
fprintf(stderr, "init_gnutls_global failed\n");
1555
exitcode = EX_UNAVAILABLE;
1556
goto end;
1557
} else {
1558
gnutls_initialized = true;
1559
}
1560
1561
if(quit_now){
1562
goto end;
1563
}
1564
1565
tempdir_created = true;
1566
if(mkdtemp(tempdir) == NULL){
1567
tempdir_created = false;
1568
perror("mkdtemp");
1569
goto end;
1570
}
1571
1572
if(quit_now){
1573
goto end;
1574
}
1575
1576
if(not init_gpgme(pubkey, seckey, tempdir)){
1577
fprintf(stderr, "init_gpgme failed\n");
1578
exitcode = EX_UNAVAILABLE;
1579
goto end;
1580
} else {
1581
gpgme_initialized = true;
1582
}
1583
1584
if(quit_now){
1585
goto end;
1586
}
1587
1588
if(connect_to != NULL){
1589
/* Connect directly, do not use Zeroconf */
1590
/* (Mainly meant for debugging) */
1591
char *address = strrchr(connect_to, ':');
1592
if(address == NULL){
1593
fprintf(stderr, "No colon in address\n");
1594
exitcode = EX_USAGE;
1595
goto end;
1596
}
1597
1598
if(quit_now){
1599
goto end;
1600
}
1601
1602
uint16_t port;
1603
errno = 0;
1604
tmpmax = strtoimax(address+1, &tmp, 10);
1605
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1606
or tmpmax != (uint16_t)tmpmax){
1607
fprintf(stderr, "Bad port number\n");
1608
exitcode = EX_USAGE;
1609
goto end;
1610
}
1611
1612
if(quit_now){
1613
goto end;
1614
}
1615
1616
port = (uint16_t)tmpmax;
1617
*address = '\0';
1618
address = connect_to;
1619
/* Colon in address indicates IPv6 */
1620
int af;
1621
if(strchr(address, ':') != NULL){
1622
af = AF_INET6;
1623
} else {
1624
af = AF_INET;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
while(not quit_now){
1632
ret = start_mandos_communication(address, port, if_index, af);
1633
if(quit_now or ret == 0){
1634
break;
1635
}
1636
sleep(15);
1637
};
1638
1639
if (not quit_now){
1640
exitcode = EXIT_SUCCESS;
1641
}
1642
1643
goto end;
1644
}
1645
1646
if(quit_now){
1647
goto end;
1648
}
1649
1650
{
1651
AvahiServerConfig config;
1652
/* Do not publish any local Zeroconf records */
1653
avahi_server_config_init(&config);
1654
config.publish_hinfo = 0;
1655
config.publish_addresses = 0;
1656
config.publish_workstation = 0;
1657
config.publish_domain = 0;
1658
1659
/* Allocate a new server */
1660
mc.server = avahi_server_new(avahi_simple_poll_get
1661
(mc.simple_poll), &config, NULL,
1662
NULL, &error);
1663
1664
/* Free the Avahi configuration data */
1665
avahi_server_config_free(&config);
1666
}
1667
1668
/* Check if creating the Avahi server object succeeded */
1669
if(mc.server == NULL){
1670
fprintf(stderr, "Failed to create Avahi server: %s\n",
1671
avahi_strerror(error));
1672
exitcode = EX_UNAVAILABLE;
1673
goto end;
1674
}
1675
1676
if(quit_now){
1677
goto end;
1678
}
1679
1680
/* Create the Avahi service browser */
1681
sb = avahi_s_service_browser_new(mc.server, if_index,
1682
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1683
NULL, 0, browse_callback, NULL);
1684
if(sb == NULL){
1685
fprintf(stderr, "Failed to create service browser: %s\n",
1686
avahi_strerror(avahi_server_errno(mc.server)));
1687
exitcode = EX_UNAVAILABLE;
1688
goto end;
1689
}
1690
1691
if(quit_now){
1692
goto end;
1693
}
1694
1695
/* Run the main loop */
1696
1697
if(debug){
1698
fprintf(stderr, "Starting Avahi loop search\n");
1699
}
1700
1701
avahi_simple_poll_loop(mc.simple_poll);
1702
940
exit(EXIT_FAILURE);
941
}
942
943
if(connect_to != NULL){
944
/* Connect directly, do not use Zeroconf */
945
/* (Mainly meant for debugging) */
946
char *address = strrchr(connect_to, ':');
947
if(address == NULL){
948
fprintf(stderr, "No colon in address\n");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
*address = '\0';
960
address = connect_to;
961
ret = start_mandos_communication(address, port, if_index, &mc);
962
if(ret < 0){
963
exitcode = EXIT_FAILURE;
964
} else {
965
exitcode = EXIT_SUCCESS;
966
}
967
goto end;
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
1703
1032
end:
1704
1705
if(debug){
1706
fprintf(stderr, "%s exiting\n", argv[0]);
1707
}
1708
1709
/* Cleanup things */
1710
if(sb != NULL)
1711
avahi_s_service_browser_free(sb);
1712
1713
if(mc.server != NULL)
1714
avahi_server_free(mc.server);
1715
1716
if(mc.simple_poll != NULL)
1717
avahi_simple_poll_free(mc.simple_poll);
1718
1719
if(gnutls_initialized){
1720
gnutls_certificate_free_credentials(mc.cred);
1721
gnutls_global_deinit();
1722
gnutls_dh_params_deinit(mc.dh_params);
1723
}
1724
1725
if(gpgme_initialized){
1726
gpgme_release(mc.ctx);
1727
}
1728
1729
/* Take down the network interface */
1730
if(take_down_interface){
1731
/* Re-raise priviliges */
1732
errno = 0;
1733
ret = seteuid(0);
1734
if(ret == -1){
1735
perror("seteuid");
1736
}
1737
if(geteuid() == 0){
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1739
if(ret == -1){
1740
perror("ioctl SIOCGIFFLAGS");
1741
} else if(network.ifr_flags & IFF_UP) {
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1744
if(ret == -1){
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1746
}
1747
}
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1749
if(ret == -1){
1750
perror("close");
1751
}
1752
/* Lower privileges permanently */
1753
errno = 0;
1754
ret = setuid(uid);
1755
if(ret == -1){
1756
perror("setuid");
1757
}
1758
}
1759
}
1760
1761
/* Removes the temp directory used by GPGME */
1762
if(tempdir_created){
1763
DIR *d;
1764
struct dirent *direntry;
1765
d = opendir(tempdir);
1766
if(d == NULL){
1767
if(errno != ENOENT){
1768
perror("opendir");
1769
}
1770
} else {
1771
while(true){
1772
direntry = readdir(d);
1773
if(direntry == NULL){
1774
break;
1775
}
1776
/* Skip "." and ".." */
1777
if(direntry->d_name[0] == '.'
1778
and (direntry->d_name[1] == '\0'
1779
or (direntry->d_name[1] == '.'
1780
and direntry->d_name[2] == '\0'))){
1781
continue;
1782
}
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1785
direntry->d_name);
1786
if(ret < 0){
1787
perror("asprintf");
1788
continue;
1789
}
1790
ret = remove(fullname);
1791
if(ret == -1){
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1793
strerror(errno));
1794
}
1795
free(fullname);
1796
}
1797
closedir(d);
1798
}
1799
ret = rmdir(tempdir);
1800
if(ret == -1 and errno != ENOENT){
1801
perror("rmdir");
1802
}
1803
}
1804
1805
if(quit_now){
1806
sigemptyset(&old_sigterm_action.sa_mask);
1807
old_sigterm_action.sa_handler = SIG_DFL;
1808
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1809
&old_sigterm_action,
1810
NULL));
1811
if(ret == -1){
1812
perror("sigaction");
1813
}
1814
do {
1815
ret = raise(signal_received);
1816
} while(ret != 0 and errno == EINTR);
1817
if(ret != 0){
1818
perror("raise");
1819
abort();
1820
}
1821
TEMP_FAILURE_RETRY(pause());
1822
}
1823
1824
return exitcode;
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
1825
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0