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- Committer: teddy at bsnet
- Date: 2010-10-05 19:03:43 UTC
- mto: (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 455.
- Revision ID: teddy@fukt.bsnet.se-20101005190343-39y0hyjy97io42cc
Tags: version-1.2.1-3
* debian/changelog (1.2.1-3): New entry.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
57
64
#include <assert.h> /* assert() */
58
65
#include <errno.h> /* perror(), errno */
59
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time(), sleep() */
60
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
61
68
SIOCSIFFLAGS, if_indextoname(),
62
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
63
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
64
getuid(), getgid(), setuid(),
65
setgid() */
66
#include <netinet/in.h>
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
67
76
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
69
78
#include <argp.h> /* struct argp_option, error_t, struct
70
79
argp_state, struct argp,
71
80
argp_parse(), ARGP_KEY_ARG,
72
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
73
91
74
92
/* Avahi */
75
93
/* All Avahi types, constants and functions
83
101
#include <avahi-common/error.h>
84
102
85
103
/* GnuTLS */
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
functions:
87
106
gnutls_*
88
107
init_gnutls_session(),
89
108
GNUTLS_* */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
91
111
GNUTLS_OPENPGP_FMT_BASE64 */
92
112
93
113
/* GPGME */
94
#include <gpgme.h> /* All GPGME types, constants and functions
114
#include <gpgme.h> /* All GPGME types, constants and
115
functions:
95
116
gpgme_*
96
117
GPGME_PROTOCOL_OpenPGP,
97
118
GPG_ERR_NO_* */
98
119
99
120
#define BUFFER_SIZE 256
100
121
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
101
126
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
127
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
128
const char *argp_program_version = "mandos-client " VERSION;
105
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
106
132
107
133
/* Used for passing in values through the Avahi callback functions */
108
134
typedef struct {
112
138
unsigned int dh_bits;
113
139
gnutls_dh_params_t dh_params;
114
140
const char *priority;
141
gpgme_ctx_t ctx;
115
142
} mandos_context;
116
143
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
117
152
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
120
155
* "buffer_length" is how much is already used.
121
156
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
157
size_t incbuffer(char **buffer, size_t buffer_length,
123
158
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
161
if(buffer == NULL){
127
162
return 0;
128
163
}
129
164
buffer_capacity += BUFFER_SIZE;
132
167
}
133
168
134
169
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
170
* Initialize GPGME.
137
171
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
144
174
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
175
gpgme_engine_info_t engine_info;
149
176
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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");
152
216
}
153
217
154
218
/* Init GPGME */
155
219
gpgme_check_version(NULL);
156
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
221
if(rc != GPG_ERR_NO_ERROR){
158
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
223
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
224
return false;
161
225
}
162
226
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
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){
166
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
231
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
232
return false;
169
233
}
170
234
while(engine_info != NULL){
171
235
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
236
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
237
engine_info->file_name, tempdir);
174
238
break;
175
239
}
176
240
engine_info = engine_info->next;
177
241
}
178
242
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
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");
181
277
}
182
278
183
279
/* Create new GPGME data buffer from memory cryptotext */
184
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
281
0);
186
if (rc != GPG_ERR_NO_ERROR){
282
if(rc != GPG_ERR_NO_ERROR){
187
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
284
gpgme_strsource(rc), gpgme_strerror(rc));
189
285
return -1;
191
287
192
288
/* Create new empty GPGME data buffer for the plaintext */
193
289
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
290
if(rc != GPG_ERR_NO_ERROR){
195
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
292
gpgme_strsource(rc), gpgme_strerror(rc));
197
293
gpgme_data_release(dh_crypto);
198
294
return -1;
199
295
}
200
296
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
297
/* Decrypt data from the cryptotext data buffer to the plaintext
211
298
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
214
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
302
gpgme_strsource(rc), gpgme_strerror(rc));
216
303
plaintext_length = -1;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
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;
240
319
while(recipient != NULL){
241
320
fprintf(stderr, "Public key algorithm: %s\n",
242
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
248
327
}
249
328
}
250
329
}
330
goto decrypt_end;
331
}
332
333
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
251
335
}
252
336
253
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
256
340
plaintext_length = -1;
257
341
goto decrypt_end;
258
342
}
259
343
260
344
*plaintext = NULL;
261
345
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
346
plaintext_capacity = incbuffer(plaintext,
263
347
(size_t)plaintext_length,
264
348
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
267
351
plaintext_length = -1;
268
352
goto decrypt_end;
269
353
}
271
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
356
BUFFER_SIZE);
273
357
/* Print the data, if any */
274
if (ret == 0){
358
if(ret == 0){
275
359
/* EOF */
276
360
break;
277
361
}
282
366
}
283
367
plaintext_length += ret;
284
368
}
285
369
286
370
if(debug){
287
371
fprintf(stderr, "Decrypted password is: ");
288
372
for(ssize_t i = 0; i < plaintext_length; i++){
301
385
return plaintext_length;
302
386
}
303
387
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
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)
307
392
ret = "(unknown)";
308
393
return ret;
309
394
}
314
399
fprintf(stderr, "GnuTLS: %s", string);
315
400
}
316
401
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
320
404
int ret;
321
405
322
406
if(debug){
324
408
}
325
409
326
410
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
330
414
return -1;
331
415
}
332
416
333
if (debug){
417
if(debug){
334
418
/* "Use a log level over 10 to enable all debugging options."
335
419
* - GnuTLS manual
336
420
*/
339
423
}
340
424
341
425
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
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();
347
434
return -1;
348
435
}
349
436
350
437
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
354
441
}
355
442
356
443
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
359
447
fprintf(stderr,
360
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
363
451
safer_gnutls_strerror(ret));
364
452
goto globalfail;
365
453
}
366
454
367
455
/* GnuTLS server initialization */
368
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
372
goto globalfail;
373
}
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
378
goto globalfail;
379
}
380
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
382
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
383
471
return 0;
384
472
385
473
globalfail:
386
387
gnutls_certificate_free_credentials(mc->cred);
474
475
gnutls_certificate_free_credentials(mc.cred);
388
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
389
478
return -1;
390
391
479
}
392
480
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
395
482
int ret;
396
483
/* GnuTLS session creation */
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
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){
399
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
492
safer_gnutls_strerror(ret));
401
493
}
402
494
403
495
{
404
496
const char *err;
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
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){
407
505
fprintf(stderr, "Syntax error at: %s\n", err);
408
506
fprintf(stderr, "GnuTLS error: %s\n",
409
507
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
508
gnutls_deinit(*session);
411
509
return -1;
412
510
}
413
511
}
414
512
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
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){
418
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
523
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
524
gnutls_deinit(*session);
421
525
return -1;
422
526
}
423
527
424
528
/* ignore client certificate if any. */
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
427
530
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
532
430
533
return 0;
431
534
}
437
540
/* Called when a Mandos server is found */
438
541
static int start_mandos_communication(const char *ip, uint16_t port,
439
542
AvahiIfIndex if_index,
440
mandos_context *mc){
441
int ret, tcp_sd;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
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;
443
550
char *buffer = NULL;
444
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
445
552
size_t buffer_length = 0;
446
553
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
448
554
size_t written;
449
int retval = 0;
450
char interface[IF_NAMESIZE];
555
int retval = -1;
451
556
gnutls_session_t session;
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
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){
455
581
return -1;
456
582
}
457
583
458
584
if(debug){
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
586
"\n", ip, port);
461
587
}
462
588
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
if(tcp_sd < 0) {
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
465
592
perror("socket");
466
return -1;
467
}
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
472
return -1;
473
}
474
fprintf(stderr, "Binding to interface %s\n", interface);
475
}
476
477
memset(&to,0,sizeof(to)); /* Spurious warning */
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
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;
483
612
perror("inet_pton");
484
return -1;
613
errno = e;
614
goto mandos_end;
485
615
}
486
616
if(ret == 0){
617
int e = errno;
487
618
fprintf(stderr, "Bad address: %s\n", ip);
488
return -1;
489
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
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
}
491
644
492
to.in6.sin6_scope_id = (uint32_t)if_index;
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
493
649
494
650
if(debug){
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
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){
500
674
perror("inet_ntop");
501
675
} else {
502
676
if(strcmp(addrstr, ip) != 0){
505
679
}
506
680
}
507
681
508
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
510
perror("connect");
511
return -1;
512
}
513
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
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
705
514
706
const char *out = mandos_protocol_version;
515
707
written = 0;
516
while (true){
708
while(true){
517
709
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
711
out_size - written));
520
if (ret == -1){
712
if(ret == -1){
713
int e = errno;
521
714
perror("write");
522
retval = -1;
715
errno = e;
523
716
goto mandos_end;
524
717
}
525
718
written += (size_t)ret;
526
719
if(written < out_size){
527
720
continue;
528
721
} else {
529
if (out == mandos_protocol_version){
722
if(out == mandos_protocol_version){
530
723
written = 0;
531
724
out = "\r\n";
532
725
} else {
533
726
break;
534
727
}
535
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
536
734
}
537
735
538
736
if(debug){
539
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
738
}
541
739
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
544
do{
545
ret = gnutls_handshake (session);
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
753
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
546
758
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
547
759
548
if (ret != GNUTLS_E_SUCCESS){
760
if(ret != GNUTLS_E_SUCCESS){
549
761
if(debug){
550
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
551
gnutls_perror (ret);
763
gnutls_perror(ret);
552
764
}
553
retval = -1;
765
errno = EPROTO;
554
766
goto mandos_end;
555
767
}
556
768
557
769
/* Read OpenPGP packet that contains the wanted password */
558
770
559
771
if(debug){
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
773
ip);
562
774
}
563
775
564
776
while(true){
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
566
784
buffer_capacity);
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
569
retval = -1;
570
goto mandos_end;
571
}
572
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
785
if(buffer_capacity == 0){
786
int e = errno;
787
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
794
goto mandos_end;
795
}
796
797
sret = gnutls_record_recv(session, buffer+buffer_length,
798
BUFFER_SIZE);
799
if(sret == 0){
576
800
break;
577
801
}
578
if (ret < 0){
579
switch(ret){
802
if(sret < 0){
803
switch(sret){
580
804
case GNUTLS_E_INTERRUPTED:
581
805
case GNUTLS_E_AGAIN:
582
806
break;
583
807
case GNUTLS_E_REHANDSHAKE:
584
do{
585
ret = gnutls_handshake (session);
808
do {
809
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
586
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
587
if (ret < 0){
816
if(ret < 0){
588
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
589
gnutls_perror (ret);
590
retval = -1;
818
gnutls_perror(ret);
819
errno = EPROTO;
591
820
goto mandos_end;
592
821
}
593
822
break;
594
823
default:
595
824
fprintf(stderr, "Unknown error while reading data from"
596
825
" encrypted session with Mandos server\n");
597
retval = -1;
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
599
828
goto mandos_end;
600
829
}
601
830
} else {
602
buffer_length += (size_t) ret;
831
buffer_length += (size_t) sret;
603
832
}
604
833
}
605
834
607
836
fprintf(stderr, "Closing TLS session\n");
608
837
}
609
838
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
612
if (buffer_length > 0){
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
851
852
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
613
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
614
855
buffer_length,
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
856
&decrypted_buffer);
857
if(decrypted_buffer_size >= 0){
858
618
859
written = 0;
619
860
while(written < (size_t) decrypted_buffer_size){
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
ret = (int)fwrite(decrypted_buffer + written, 1,
867
(size_t)decrypted_buffer_size - written,
868
stdout);
623
869
if(ret == 0 and ferror(stdout)){
870
int e = errno;
624
871
if(debug){
625
872
fprintf(stderr, "Error writing encrypted data: %s\n",
626
873
strerror(errno));
627
874
}
628
retval = -1;
629
break;
875
errno = e;
876
goto mandos_end;
630
877
}
631
878
written += (size_t)ret;
632
879
}
633
free(decrypted_buffer);
634
} else {
635
retval = -1;
880
retval = 0;
636
881
}
637
882
}
638
883
639
884
/* Shutdown procedure */
640
885
641
886
mandos_end:
642
free(buffer);
643
close(tcp_sd);
644
gnutls_deinit (session);
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
903
retval = -1;
904
}
905
errno = e;
906
}
645
907
return retval;
646
908
}
647
909
648
910
static void resolve_callback(AvahiSServiceResolver *r,
649
911
AvahiIfIndex interface,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
912
AvahiProtocol proto,
651
913
AvahiResolverEvent event,
652
914
const char *name,
653
915
const char *type,
658
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
659
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
660
922
flags,
661
void* userdata) {
662
mandos_context *mc = userdata;
663
assert(r); /* Spurious warning */
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
664
925
665
926
/* Called whenever a service has been resolved successfully or
666
927
timed out */
667
928
668
switch (event) {
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
669
934
default:
670
935
case AVAHI_RESOLVER_FAILURE:
671
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
672
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
673
avahi_strerror(avahi_server_errno(mc->server)));
938
avahi_strerror(avahi_server_errno(mc.server)));
674
939
break;
675
940
676
941
case AVAHI_RESOLVER_FOUND:
679
944
avahi_address_snprint(ip, sizeof(ip), address);
680
945
if(debug){
681
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
684
949
}
685
int ret = start_mandos_communication(ip, port, interface, mc);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
952
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
688
954
}
689
955
}
690
956
}
691
957
avahi_s_service_resolver_free(r);
692
958
}
693
959
694
static void browse_callback( AvahiSServiceBrowser *b,
695
AvahiIfIndex interface,
696
AvahiProtocol protocol,
697
AvahiBrowserEvent event,
698
const char *name,
699
const char *type,
700
const char *domain,
701
AVAHI_GCC_UNUSED AvahiLookupResultFlags
702
flags,
703
void* userdata) {
704
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
960
static void browse_callback(AvahiSServiceBrowser *b,
961
AvahiIfIndex interface,
962
AvahiProtocol protocol,
963
AvahiBrowserEvent event,
964
const char *name,
965
const char *type,
966
const char *domain,
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
flags,
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
706
971
707
972
/* Called whenever a new services becomes available on the LAN or
708
973
is removed from the LAN */
709
974
710
switch (event) {
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
711
980
default:
712
981
case AVAHI_BROWSER_FAILURE:
713
982
714
983
fprintf(stderr, "(Avahi browser) %s\n",
715
avahi_strerror(avahi_server_errno(mc->server)));
716
avahi_simple_poll_quit(mc->simple_poll);
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
717
986
return;
718
987
719
988
case AVAHI_BROWSER_NEW:
722
991
the callback function is called the Avahi server will free the
723
992
resolver for us. */
724
993
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
726
protocol, name, type, domain,
727
AVAHI_PROTO_INET6, 0,
728
resolve_callback, mc)))
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
729
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
730
name, avahi_strerror(avahi_server_errno(mc->server)));
998
name, avahi_strerror(avahi_server_errno(mc.server)));
731
999
break;
732
1000
733
1001
case AVAHI_BROWSER_REMOVE:
742
1010
}
743
1011
}
744
1012
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
751
if (tmp == NULL){
752
return NULL;
753
}
754
if(f_len > 0){
755
memcpy(tmp, first, f_len); /* Spurious warning */
756
}
757
tmp[f_len] = '/';
758
if(s_len > 0){
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
760
}
761
tmp[f_len + 1 + s_len] = '\0';
762
return tmp;
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
1020
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
1024
errno = old_errno;
763
1025
}
764
1026
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
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
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1120
}
765
1121
766
1122
int main(int argc, char *argv[]){
767
AvahiSServiceBrowser *sb = NULL;
768
int error;
769
int ret;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
773
int sd;
774
uid_t uid;
775
gid_t gid;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
783
784
{
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
791
.group = 1 },
792
{ .name = "interface", .key = 'i',
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
799
.group = 1 },
800
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
803
.group = 1 },
804
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
807
.group = 2 },
808
{ .name = "dh-bits", .key = 129,
809
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
811
.group = 2 },
812
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
815
{ .name = NULL }
816
};
817
818
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
825
debug = true;
826
break;
827
case 'c':
828
connect_to = arg;
829
break;
830
case 'i':
831
interface = arg;
832
break;
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
847
exit(EXIT_FAILURE);
848
}
849
break;
850
case 130:
851
mc.priority = arg;
852
break;
853
case ARGP_KEY_ARG:
854
argp_usage (state);
855
break;
856
case ARGP_KEY_END:
857
break;
858
default:
859
return ARGP_ERR_UNKNOWN;
860
}
861
return 0;
862
}
863
864
struct argp argp = { .options = options, .parser = parse_opt,
865
.args_doc = "",
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
1123
AvahiSServiceBrowser *sb = NULL;
1124
int error;
1125
int ret;
1126
intmax_t tmpmax;
1127
char *tmp;
1128
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1136
bool tempdir_created = false;
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
const char *seckey = PATHDIR "/" SECKEY;
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1140
1141
bool gnutls_initialized = false;
1142
bool gpgme_initialized = false;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
/* Lower any group privileges we might have, just to be safe */
1152
errno = 0;
1153
ret = setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
/* Lower user privileges (temporarily) */
1159
errno = 0;
1160
ret = seteuid(uid);
1161
if(ret == -1){
1162
perror("seteuid");
1163
}
1164
1165
if(quit_now){
1166
goto end;
1167
}
1168
1169
{
1170
struct argp_option options[] = {
1171
{ .name = "debug", .key = 128,
1172
.doc = "Debug mode", .group = 3 },
1173
{ .name = "connect", .key = 'c',
1174
.arg = "ADDRESS:PORT",
1175
.doc = "Connect directly to a specific Mandos server",
1176
.group = 1 },
1177
{ .name = "interface", .key = 'i',
1178
.arg = "NAME",
1179
.doc = "Network interface that will be used to search for"
1180
" Mandos servers",
1181
.group = 1 },
1182
{ .name = "seckey", .key = 's',
1183
.arg = "FILE",
1184
.doc = "OpenPGP secret key file base name",
1185
.group = 1 },
1186
{ .name = "pubkey", .key = 'p',
1187
.arg = "FILE",
1188
.doc = "OpenPGP public key file base name",
1189
.group = 2 },
1190
{ .name = "dh-bits", .key = 129,
1191
.arg = "BITS",
1192
.doc = "Bit length of the prime number used in the"
1193
" Diffie-Hellman key exchange",
1194
.group = 2 },
1195
{ .name = "priority", .key = 130,
1196
.arg = "STRING",
1197
.doc = "GnuTLS priority string for the TLS handshake",
1198
.group = 1 },
1199
{ .name = "delay", .key = 131,
1200
.arg = "SECONDS",
1201
.doc = "Maximum delay to wait for interface startup",
1202
.group = 2 },
1203
/*
1204
* These reproduce what we would get without ARGP_NO_HELP
1205
*/
1206
{ .name = "help", .key = '?',
1207
.doc = "Give this help list", .group = -1 },
1208
{ .name = "usage", .key = -3,
1209
.doc = "Give a short usage message", .group = -1 },
1210
{ .name = "version", .key = 'V',
1211
.doc = "Print program version", .group = -1 },
1212
{ .name = NULL }
1213
};
1214
1215
error_t parse_opt(int key, char *arg,
1216
struct argp_state *state){
1217
errno = 0;
1218
switch(key){
1219
case 128: /* --debug */
1220
debug = true;
1221
break;
1222
case 'c': /* --connect */
1223
connect_to = arg;
1224
break;
1225
case 'i': /* --interface */
1226
interface = arg;
1227
break;
1228
case 's': /* --seckey */
1229
seckey = arg;
1230
break;
1231
case 'p': /* --pubkey */
1232
pubkey = arg;
1233
break;
1234
case 129: /* --dh-bits */
1235
errno = 0;
1236
tmpmax = strtoimax(arg, &tmp, 10);
1237
if(errno != 0 or tmp == arg or *tmp != '\0'
1238
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1239
argp_error(state, "Bad number of DH bits");
1240
}
1241
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
break;
1243
case 130: /* --priority */
1244
mc.priority = arg;
1245
break;
1246
case 131: /* --delay */
1247
errno = 0;
1248
delay = strtof(arg, &tmp);
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
argp_error(state, "Bad delay");
1251
}
1252
break;
1253
/*
1254
* These reproduce what we would get without ARGP_NO_HELP
1255
*/
1256
case '?': /* --help */
1257
argp_state_help(state, state->out_stream,
1258
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1259
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1260
case -3: /* --usage */
1261
argp_state_help(state, state->out_stream,
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1265
exit(argp_err_exit_status);
1266
break;
1267
default:
1268
return ARGP_ERR_UNKNOWN;
1269
}
1270
return errno;
1271
}
1272
1273
struct argp argp = { .options = options, .parser = parse_opt,
1274
.args_doc = "",
1275
.doc = "Mandos client -- Get and decrypt"
1276
" passwords from a Mandos server" };
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1279
switch(ret){
1280
case 0:
1281
break;
1282
case ENOMEM:
1283
default:
1284
errno = ret;
1285
perror("argp_parse");
1286
exitcode = EX_OSERR;
1287
goto end;
1288
case EINVAL:
1289
exitcode = EX_USAGE;
1290
goto end;
1291
}
1292
}
1293
1294
if(not debug){
1295
avahi_set_log_function(empty_log);
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
871
1311
exitcode = EXIT_FAILURE;
872
1312
goto end;
873
1313
}
874
}
875
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
879
1318
exitcode = EXIT_FAILURE;
880
1319
goto end;
881
1320
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
897
uid = getuid();
898
gid = getgid();
899
900
ret = setuid(uid);
901
if (ret == -1){
902
perror("setuid");
903
}
904
905
setgid(gid);
906
if (ret == -1){
907
perror("setgid");
908
}
909
1321
}
1322
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
from the signal handler */
1325
/* Initialize the pseudo-RNG for Avahi */
1326
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1330
exitcode = EX_UNAVAILABLE;
1331
goto end;
1332
}
1333
1334
sigemptyset(&sigterm_action.sa_mask);
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
if(ret == -1){
1337
perror("sigaddset");
1338
exitcode = EX_OSERR;
1339
goto end;
1340
}
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
if(ret == -1){
1343
perror("sigaddset");
1344
exitcode = EX_OSERR;
1345
goto end;
1346
}
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
if(ret == -1){
1349
perror("sigaddset");
1350
exitcode = EX_OSERR;
1351
goto end;
1352
}
1353
/* Need to check if the handler is SIG_IGN before handling:
1354
| [[info:libc:Initial Signal Actions]] |
1355
| [[info:libc:Basic Signal Handling]] |
1356
*/
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
if(ret == -1){
1359
perror("sigaction");
1360
return EX_OSERR;
1361
}
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
if(ret == -1){
1365
perror("sigaction");
1366
exitcode = EX_OSERR;
1367
goto end;
1368
}
1369
}
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
if(ret == -1){
1372
perror("sigaction");
1373
return EX_OSERR;
1374
}
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
if(ret == -1){
1378
perror("sigaction");
1379
exitcode = EX_OSERR;
1380
goto end;
1381
}
1382
}
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
if(ret == -1){
1385
perror("sigaction");
1386
return EX_OSERR;
1387
}
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
910
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
911
1400
if(if_index == 0){
912
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
exit(EXIT_FAILURE);
914
}
915
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
920
if(address == NULL){
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
923
goto end;
924
}
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
930
goto end;
931
}
932
*address = '\0';
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
935
if(ret < 0){
936
exitcode = EXIT_FAILURE;
937
} else {
938
exitcode = EXIT_SUCCESS;
939
}
940
goto end;
941
}
942
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
953
if(ret == -1){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
1539
}
1540
1541
if(quit_now){
1542
goto end;
1543
}
1544
1545
ret = init_gnutls_global(pubkey, seckey);
1546
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
1548
exitcode = EX_UNAVAILABLE;
1549
goto end;
1550
} else {
1551
gnutls_initialized = true;
1552
}
1553
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
1565
if(quit_now){
1566
goto end;
1567
}
1568
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1572
goto end;
1573
} else {
1574
gpgme_initialized = true;
1575
}
1576
1577
if(quit_now){
1578
goto end;
1579
}
1580
1581
if(connect_to != NULL){
1582
/* Connect directly, do not use Zeroconf */
1583
/* (Mainly meant for debugging) */
1584
char *address = strrchr(connect_to, ':');
1585
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
1587
exitcode = EX_USAGE;
1588
goto end;
1589
}
1590
1591
if(quit_now){
1592
goto end;
1593
}
1594
1595
uint16_t port;
1596
errno = 0;
1597
tmpmax = strtoimax(address+1, &tmp, 10);
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1609
port = (uint16_t)tmpmax;
1610
*address = '\0';
1611
address = connect_to;
1612
/* Colon in address indicates IPv6 */
1613
int af;
1614
if(strchr(address, ':') != NULL){
1615
af = AF_INET6;
1616
} else {
1617
af = AF_INET;
1618
}
1619
1620
if(quit_now){
1621
goto end;
1622
}
1623
1624
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
1626
if(quit_now or ret == 0){
1627
break;
1628
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
1633
exitcode = EXIT_SUCCESS;
1634
}
1635
1636
goto end;
1637
}
1638
1639
if(quit_now){
1640
goto end;
1641
}
1642
1643
{
1644
AvahiServerConfig config;
1645
/* Do not publish any local Zeroconf records */
1646
avahi_server_config_init(&config);
1647
config.publish_hinfo = 0;
1648
config.publish_addresses = 0;
1649
config.publish_workstation = 0;
1650
config.publish_domain = 0;
1651
1652
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
1656
1657
/* Free the Avahi configuration data */
1658
avahi_server_config_free(&config);
1659
}
1660
1661
/* Check if creating the Avahi server object succeeded */
1662
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1670
goto end;
1671
}
1672
1673
/* Create the Avahi service browser */
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
1677
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
1680
exitcode = EX_UNAVAILABLE;
1681
goto end;
1682
}
1683
1684
if(quit_now){
1685
goto end;
1686
}
1687
1688
/* Run the main loop */
1689
1690
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
1695
1696
end:
1697
1698
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
1700
}
1701
1702
/* Cleanup things */
1703
if(sb != NULL)
1704
avahi_s_service_browser_free(sb);
1705
1706
if(mc.server != NULL)
1707
avahi_server_free(mc.server);
1708
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
1711
1712
if(gnutls_initialized){
1713
gnutls_certificate_free_credentials(mc.cred);
1714
gnutls_global_deinit();
1715
gnutls_dh_params_deinit(mc.dh_params);
1716
}
1717
1718
if(gpgme_initialized){
1719
gpgme_release(mc.ctx);
1720
}
1721
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
960
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
1737
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
967
close(sd);
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
1032
end:
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;
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
1755
if(tempdir_created){
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
1776
char *fullname = NULL;
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
direntry->d_name);
1779
if(ret < 0){
1780
perror("asprintf");
1781
continue;
1782
}
1783
ret = remove(fullname);
1784
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
1787
}
1788
free(fullname);
1789
}
1790
closedir(d);
1791
}
1792
ret = rmdir(tempdir);
1793
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
1795
}
1796
}
1797
1798
if(quit_now){
1799
sigemptyset(&old_sigterm_action.sa_mask);
1800
old_sigterm_action.sa_handler = SIG_DFL;
1801
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1802
&old_sigterm_action,
1803
NULL));
1804
if(ret == -1){
1805
perror("sigaction");
1806
}
1807
do {
1808
ret = raise(signal_received);
1809
} while(ret != 0 and errno == EINTR);
1810
if(ret != 0){
1811
perror("raise");
1812
abort();
1813
}
1814
TEMP_FAILURE_RETRY(pause());
1815
}
1816
1817
return exitcode;
1056
1818
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0