To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 397
- compare with another revision
- download diff
- download tarball
- view history from revision 397
- Committer: Teddy Hogeborn
- Date: 2009-10-30 16:23:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20091030162343-1p2a8bf3gc084kc9
* plugins.d/password-prompt.c: Use environment variables and prompt
text from cryptsetup 1.1.
* plugins.d/password-prompt.xml (ENVIRONMENT): Document change in
environment variables
used.
text from cryptsetup 1.1.
* plugins.d/password-prompt.xml (ENVIRONMENT): Document change in
environment variables
used.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
83
sigaction(), SIGTERM, sig_atomic_t,
84
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
94
86
95
87
#ifdef __linux__
96
88
#include <sys/klog.h> /* klogctl() */
114
106
init_gnutls_session(),
115
107
GNUTLS_* */
116
108
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
119
111
120
112
/* GPGME */
121
113
#include <gpgme.h> /* All GPGME types, constants and
129
121
#define PATHDIR "/conf/conf.d/mandos"
130
122
#define SECKEY "seckey.txt"
131
123
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
124
134
125
bool debug = false;
135
126
static const char mandos_protocol_version[] = "1";
136
127
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
129
155
130
/* Used for passing in values through the Avahi callback functions */
156
131
typedef struct {
161
136
gnutls_dh_params_t dh_params;
162
137
const char *priority;
163
138
gpgme_ctx_t ctx;
164
server *current_server;
165
139
} mandos_context;
166
140
167
141
/* global context so signal handler can reach it*/
168
142
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
143
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
172
145
173
146
sig_atomic_t quit_now = 0;
174
147
int signal_received = 0;
175
148
176
/* Function to use when printing errors */
177
void perror_plus(const char *print_text){
178
int e = errno;
179
fprintf(stderr, "Mandos plugin %s: ",
180
program_invocation_short_name);
181
errno = e;
182
perror(print_text);
183
}
184
185
__attribute__((format (gnu_printf, 2, 3)))
186
int fprintf_plus(FILE *stream, const char *format, ...){
187
va_list ap;
188
va_start (ap, format);
189
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
}
194
195
149
/*
196
150
* Make additional room in "buffer" for at least BUFFER_SIZE more
197
151
* bytes. "buffer_capacity" is how much is currently allocated,
198
152
* "buffer_length" is how much is already used.
199
153
*/
200
154
size_t incbuffer(char **buffer, size_t buffer_length,
201
size_t buffer_capacity){
155
size_t buffer_capacity){
202
156
if(buffer_length + BUFFER_SIZE > buffer_capacity){
203
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
158
if(buffer == NULL){
209
163
return buffer_capacity;
210
164
}
211
165
212
/* Add server to set of servers to retry periodically */
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
215
int ret;
216
server *new_server = malloc(sizeof(server));
217
if(new_server == NULL){
218
perror_plus("malloc");
219
return false;
220
}
221
*new_server = (server){ .ip = strdup(ip),
222
.port = port,
223
.if_index = if_index,
224
.af = af };
225
if(new_server->ip == NULL){
226
perror_plus("strdup");
227
return false;
228
}
229
/* Special case of first server */
230
if (mc.current_server == NULL){
231
new_server->next = new_server;
232
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
235
} else {
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
238
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
245
}
246
return true;
247
}
248
249
166
/*
250
167
* Initialize GPGME.
251
168
*/
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
254
171
gpgme_error_t rc;
255
172
gpgme_engine_info_t engine_info;
256
173
265
182
266
183
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
267
184
if(fd == -1){
268
perror_plus("open");
185
perror("open");
269
186
return false;
270
187
}
271
188
272
189
rc = gpgme_data_new_from_fd(&pgp_data, fd);
273
190
if(rc != GPG_ERR_NO_ERROR){
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
276
193
return false;
277
194
}
278
195
279
196
rc = gpgme_op_import(mc.ctx, pgp_data);
280
197
if(rc != GPG_ERR_NO_ERROR){
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
283
200
return false;
284
201
}
285
202
286
203
ret = (int)TEMP_FAILURE_RETRY(close(fd));
287
204
if(ret == -1){
288
perror_plus("close");
205
perror("close");
289
206
}
290
207
gpgme_data_release(pgp_data);
291
208
return true;
292
209
}
293
210
294
211
if(debug){
295
fprintf_plus(stderr, "Initializing GPGME\n");
212
fprintf(stderr, "Initializing GPGME\n");
296
213
}
297
214
298
215
/* Init GPGME */
299
216
gpgme_check_version(NULL);
300
217
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
301
218
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
304
221
return false;
305
222
}
306
223
307
/* Set GPGME home directory for the OpenPGP engine only */
224
/* Set GPGME home directory for the OpenPGP engine only */
308
225
rc = gpgme_get_engine_info(&engine_info);
309
226
if(rc != GPG_ERR_NO_ERROR){
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
312
229
return false;
313
230
}
314
231
while(engine_info != NULL){
320
237
engine_info = engine_info->next;
321
238
}
322
239
if(engine_info == NULL){
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
325
241
return false;
326
242
}
327
243
328
244
/* Create new GPGME "context" */
329
245
rc = gpgme_new(&(mc.ctx));
330
246
if(rc != GPG_ERR_NO_ERROR){
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
334
249
return false;
335
250
}
336
251
355
270
ssize_t plaintext_length = 0;
356
271
357
272
if(debug){
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
359
274
}
360
275
361
276
/* Create new GPGME data buffer from memory cryptotext */
362
277
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
363
278
0);
364
279
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
367
282
return -1;
368
283
}
369
284
370
285
/* Create new empty GPGME data buffer for the plaintext */
371
286
rc = gpgme_data_new(&dh_plain);
372
287
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
376
290
gpgme_data_release(dh_crypto);
377
291
return -1;
378
292
}
381
295
data buffer */
382
296
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
383
297
if(rc != GPG_ERR_NO_ERROR){
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
386
300
plaintext_length = -1;
387
301
if(debug){
388
302
gpgme_decrypt_result_t result;
389
303
result = gpgme_op_decrypt_result(mc.ctx);
390
304
if(result == NULL){
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
392
306
} else {
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
397
311
if(result->file_name != NULL){
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
fprintf(stderr, "File name: %s\n", result->file_name);
399
313
}
400
314
gpgme_recipient_t recipient;
401
315
recipient = result->recipients;
402
316
while(recipient != NULL){
403
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
407
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
322
? "No" : "Yes");
410
323
recipient = recipient->next;
411
324
}
412
325
}
415
328
}
416
329
417
330
if(debug){
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
419
332
}
420
333
421
334
/* Seek back to the beginning of the GPGME plaintext data buffer */
422
335
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
423
perror_plus("gpgme_data_seek");
336
perror("gpgme_data_seek");
424
337
plaintext_length = -1;
425
338
goto decrypt_end;
426
339
}
428
341
*plaintext = NULL;
429
342
while(true){
430
343
plaintext_capacity = incbuffer(plaintext,
431
(size_t)plaintext_length,
432
plaintext_capacity);
344
(size_t)plaintext_length,
345
plaintext_capacity);
433
346
if(plaintext_capacity == 0){
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
437
350
}
438
351
439
352
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
444
357
break;
445
358
}
446
359
if(ret < 0){
447
perror_plus("gpgme_data_read");
360
perror("gpgme_data_read");
448
361
plaintext_length = -1;
449
362
goto decrypt_end;
450
363
}
452
365
}
453
366
454
367
if(debug){
455
fprintf_plus(stderr, "Decrypted password is: ");
368
fprintf(stderr, "Decrypted password is: ");
456
369
for(ssize_t i = 0; i < plaintext_length; i++){
457
370
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
458
371
}
470
383
}
471
384
472
385
static const char * safer_gnutls_strerror(int value){
473
const char *ret = gnutls_strerror(value);
386
const char *ret = gnutls_strerror(value); /* Spurious warning from
387
-Wunreachable-code */
474
388
if(ret == NULL)
475
389
ret = "(unknown)";
476
390
return ret;
479
393
/* GnuTLS log function callback */
480
394
static void debuggnutls(__attribute__((unused)) int level,
481
395
const char* string){
482
fprintf_plus(stderr, "GnuTLS: %s", string);
396
fprintf(stderr, "GnuTLS: %s", string);
483
397
}
484
398
485
399
static int init_gnutls_global(const char *pubkeyfilename,
487
401
int ret;
488
402
489
403
if(debug){
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
fprintf(stderr, "Initializing GnuTLS\n");
491
405
}
492
406
493
407
ret = gnutls_global_init();
494
408
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
497
411
return -1;
498
412
}
499
413
506
420
}
507
421
508
422
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
423
gnutls_certificate_allocate_credentials(&mc.cred);
510
424
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
513
430
gnutls_global_deinit();
514
431
return -1;
515
432
}
516
433
517
434
if(debug){
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
522
438
}
523
439
524
440
ret = gnutls_certificate_set_openpgp_key_file
525
441
(mc.cred, pubkeyfilename, seckeyfilename,
526
442
GNUTLS_OPENPGP_FMT_BASE64);
527
443
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
530
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
safer_gnutls_strerror(ret));
444
fprintf(stderr,
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
533
449
goto globalfail;
534
450
}
535
451
536
452
/* GnuTLS server initialization */
537
453
ret = gnutls_dh_params_init(&mc.dh_params);
538
454
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
542
457
goto globalfail;
543
458
}
544
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
460
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
548
463
goto globalfail;
549
464
}
550
465
570
485
}
571
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
487
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
576
490
}
577
491
578
492
{
585
499
}
586
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
501
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
591
505
gnutls_deinit(*session);
592
506
return -1;
593
507
}
602
516
}
603
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
518
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
607
521
gnutls_deinit(*session);
608
522
return -1;
609
523
}
621
535
__attribute__((unused)) const char *txt){}
622
536
623
537
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
538
static int start_mandos_communication(const char *ip, uint16_t port,
625
539
AvahiIfIndex if_index,
626
540
int af){
627
541
int ret, tcp_sd = -1;
639
553
gnutls_session_t session;
640
554
int pf; /* Protocol family */
641
555
642
errno = 0;
643
644
556
if(quit_now){
645
errno = EINTR;
646
557
return -1;
647
558
}
648
559
654
565
pf = PF_INET;
655
566
break;
656
567
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
568
fprintf(stderr, "Bad address family: %d\n", af);
659
569
return -1;
660
570
}
661
571
665
575
}
666
576
667
577
if(debug){
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
670
580
}
671
581
672
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
673
583
if(tcp_sd < 0){
674
int e = errno;
675
perror_plus("socket");
676
errno = e;
584
perror("socket");
677
585
goto mandos_end;
678
586
}
679
587
680
588
if(quit_now){
681
errno = EINTR;
682
589
goto mandos_end;
683
590
}
684
591
691
598
ret = inet_pton(af, ip, &to.in.sin_addr);
692
599
}
693
600
if(ret < 0 ){
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
601
perror("inet_pton");
697
602
goto mandos_end;
698
603
}
699
604
if(ret == 0){
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
605
fprintf(stderr, "Bad address: %s\n", ip);
703
606
goto mandos_end;
704
607
}
705
608
if(af == AF_INET6){
706
to.in6.sin6_port = htons(port);
609
to.in6.sin6_port = htons(port); /* Spurious warnings from
610
-Wconversion and
611
-Wunreachable-code */
612
707
613
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
614
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
615
-Wunreachable-code*/
710
616
if(if_index == AVAHI_IF_UNSPEC){
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
714
619
goto mandos_end;
715
620
}
716
621
/* Set the network interface number as scope */
723
628
}
724
629
725
630
if(quit_now){
726
errno = EINTR;
727
631
goto mandos_end;
728
632
}
729
633
731
635
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
732
636
char interface[IF_NAMESIZE];
733
637
if(if_indextoname((unsigned int)if_index, interface) == NULL){
734
perror_plus("if_indextoname");
638
perror("if_indextoname");
735
639
} else {
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
738
642
}
739
643
} else {
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
742
646
}
743
647
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
648
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
751
655
sizeof(addrstr));
752
656
}
753
657
if(pcret == NULL){
754
perror_plus("inet_ntop");
658
perror("inet_ntop");
755
659
} else {
756
660
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
662
}
759
663
}
760
664
}
761
665
762
666
if(quit_now){
763
errno = EINTR;
764
667
goto mandos_end;
765
668
}
766
669
770
673
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
674
}
772
675
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
676
perror("connect");
778
677
goto mandos_end;
779
678
}
780
679
781
680
if(quit_now){
782
errno = EINTR;
783
681
goto mandos_end;
784
682
}
785
683
788
686
while(true){
789
687
size_t out_size = strlen(out);
790
688
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
791
out_size - written));
689
out_size - written));
792
690
if(ret == -1){
793
int e = errno;
794
perror_plus("write");
795
errno = e;
691
perror("write");
796
692
goto mandos_end;
797
693
}
798
694
written += (size_t)ret;
808
704
}
809
705
810
706
if(quit_now){
811
errno = EINTR;
812
707
goto mandos_end;
813
708
}
814
709
}
815
710
816
711
if(debug){
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
818
713
}
819
714
820
715
if(quit_now){
821
errno = EINTR;
822
716
goto mandos_end;
823
717
}
824
718
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
830
720
831
721
if(quit_now){
832
errno = EINTR;
833
722
goto mandos_end;
834
723
}
835
724
836
725
do {
837
726
ret = gnutls_handshake(session);
838
727
if(quit_now){
839
errno = EINTR;
840
728
goto mandos_end;
841
729
}
842
730
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
843
731
844
732
if(ret != GNUTLS_E_SUCCESS){
845
733
if(debug){
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
735
gnutls_perror(ret);
848
736
}
849
errno = EPROTO;
850
737
goto mandos_end;
851
738
}
852
739
853
740
/* Read OpenPGP packet that contains the wanted password */
854
741
855
742
if(debug){
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
858
745
}
859
746
860
747
while(true){
861
748
862
749
if(quit_now){
863
errno = EINTR;
864
750
goto mandos_end;
865
751
}
866
752
867
753
buffer_capacity = incbuffer(&buffer, buffer_length,
868
buffer_capacity);
754
buffer_capacity);
869
755
if(buffer_capacity == 0){
870
int e = errno;
871
perror_plus("incbuffer");
872
errno = e;
756
perror("incbuffer");
873
757
goto mandos_end;
874
758
}
875
759
876
760
if(quit_now){
877
errno = EINTR;
878
761
goto mandos_end;
879
762
}
880
763
893
776
ret = gnutls_handshake(session);
894
777
895
778
if(quit_now){
896
errno = EINTR;
897
779
goto mandos_end;
898
780
}
899
781
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
900
782
if(ret < 0){
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
903
784
gnutls_perror(ret);
904
errno = EPROTO;
905
785
goto mandos_end;
906
786
}
907
787
break;
908
788
default:
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
911
791
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
913
792
goto mandos_end;
914
793
}
915
794
} else {
918
797
}
919
798
920
799
if(debug){
921
fprintf_plus(stderr, "Closing TLS session\n");
800
fprintf(stderr, "Closing TLS session\n");
922
801
}
923
802
924
803
if(quit_now){
925
errno = EINTR;
926
804
goto mandos_end;
927
805
}
928
806
929
807
do {
930
808
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
931
809
if(quit_now){
932
errno = EINTR;
933
810
goto mandos_end;
934
811
}
935
812
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
936
813
937
814
if(buffer_length > 0){
938
815
ssize_t decrypted_buffer_size;
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
940
818
&decrypted_buffer);
941
819
if(decrypted_buffer_size >= 0){
942
820
943
821
written = 0;
944
822
while(written < (size_t) decrypted_buffer_size){
945
823
if(quit_now){
946
errno = EINTR;
947
824
goto mandos_end;
948
825
}
949
826
951
828
(size_t)decrypted_buffer_size - written,
952
829
stdout);
953
830
if(ret == 0 and ferror(stdout)){
954
int e = errno;
955
831
if(debug){
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
958
834
}
959
errno = e;
960
835
goto mandos_end;
961
836
}
962
837
written += (size_t)ret;
968
843
/* Shutdown procedure */
969
844
970
845
mandos_end:
971
{
972
int e = errno;
973
free(decrypted_buffer);
974
free(buffer);
975
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
977
}
978
if(ret == -1){
979
if(e == 0){
980
e = errno;
981
}
982
perror_plus("close");
983
}
984
gnutls_deinit(session);
985
errno = e;
986
if(quit_now){
987
errno = EINTR;
988
retval = -1;
989
}
846
free(decrypted_buffer);
847
free(buffer);
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
851
if(ret == -1){
852
perror("close");
853
}
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
990
857
}
991
858
return retval;
992
859
}
1005
872
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1006
873
flags,
1007
874
AVAHI_GCC_UNUSED void* userdata){
1008
if(r == NULL){
1009
return;
1010
}
875
assert(r);
1011
876
1012
877
/* Called whenever a service has been resolved successfully or
1013
878
timed out */
1019
884
switch(event){
1020
885
default:
1021
886
case AVAHI_RESOLVER_FAILURE:
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
887
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
888
" of type '%s' in domain '%s': %s\n", name, type, domain,
889
avahi_strerror(avahi_server_errno(mc.server)));
1026
890
break;
1027
891
1028
892
case AVAHI_RESOLVER_FOUND:
1030
894
char ip[AVAHI_ADDRESS_STR_MAX];
1031
895
avahi_address_snprint(ip, sizeof(ip), address);
1032
896
if(debug){
1033
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1034
PRIdMAX ") on port %" PRIu16 "\n", name,
1035
host_name, ip, (intmax_t)interface, port);
897
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
898
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
899
ip, (intmax_t)interface, port);
1036
900
}
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
901
int ret = start_mandos_communication(ip, port, interface,
1039
902
avahi_proto_to_af(proto));
1040
903
if(ret == 0){
1041
904
avahi_simple_poll_quit(mc.simple_poll);
1042
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
" list\n", name);
1047
}
1048
905
}
1049
906
}
1050
907
}
1061
918
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
919
flags,
1063
920
AVAHI_GCC_UNUSED void* userdata){
1064
if(b == NULL){
1065
return;
1066
}
921
assert(b);
1067
922
1068
923
/* Called whenever a new services becomes available on the LAN or
1069
924
is removed from the LAN */
1076
931
default:
1077
932
case AVAHI_BROWSER_FAILURE:
1078
933
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
1081
936
avahi_simple_poll_quit(mc.simple_poll);
1082
937
return;
1083
938
1090
945
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
946
name, type, domain, protocol, 0,
1092
947
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
1096
950
break;
1097
951
1098
952
case AVAHI_BROWSER_REMOVE:
1101
955
case AVAHI_BROWSER_ALL_FOR_NOW:
1102
956
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1103
957
if(debug){
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1106
959
}
1107
960
break;
1108
961
}
1109
962
}
1110
963
1111
/* Signal handler that stops main loop after SIGTERM */
964
/* stop main loop after sigterm has been called */
1112
965
static void handle_sigterm(int sig){
1113
966
if(quit_now){
1114
967
return;
1116
969
quit_now = 1;
1117
970
signal_received = sig;
1118
971
int old_errno = errno;
1119
/* set main loop to exit */
1120
972
if(mc.simple_poll != NULL){
1121
973
avahi_simple_poll_quit(mc.simple_poll);
1122
974
}
1123
975
errno = old_errno;
1124
976
}
1125
977
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1460
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1468
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1539
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
1576
}
1577
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1584
struct ifreq network;
1585
unsigned int if_index = if_nametoindex(interface);
1586
if(if_index == 0){
1587
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1588
errno = old_errno;
1589
return ENXIO;
1590
}
1591
1592
if(quit_now){
1593
errno = old_errno;
1594
return EINTR;
1595
}
1596
1597
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
1599
ret_errno = errno;
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1601
"\"%s\"\n", interface);
1602
return ret_errno;
1603
}
1604
network.ifr_flags |= IFF_UP;
1605
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1608
ret_errno = errno;
1609
perror_plus("socket");
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
1614
if(quit_now){
1615
close(sd);
1616
errno = old_errno;
1617
return EINTR;
1618
}
1619
1620
if(debug){
1621
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1622
interface);
1623
}
1624
1625
/* Raise priviliges */
1626
raise_privileges();
1627
1628
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1636
}
1637
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1640
#ifdef __linux__
1641
if(restore_loglevel){
1642
ret_linux = klogctl(7, NULL, 0);
1643
if(ret_linux == -1){
1644
perror_plus("klogctl");
1645
}
1646
}
1647
#endif /* __linux__ */
1648
1649
/* Lower privileges */
1650
lower_privileges();
1651
1652
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1654
if(ret == -1){
1655
perror_plus("close");
1656
}
1657
1658
if(ret_setflags == -1){
1659
errno = ret_errno;
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
errno = old_errno;
1662
return ret_errno;
1663
}
1664
} else if(debug){
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
interface);
1667
}
1668
1669
/* Sleep checking until interface is running.
1670
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
1672
if(interface_is_running(interface)){
1673
break;
1674
}
1675
struct timespec sleeptime = { .tv_nsec = 250000000 };
1676
ret = nanosleep(&sleeptime, NULL);
1677
if(ret == -1 and errno != EINTR){
1678
perror_plus("nanosleep");
1679
}
1680
}
1681
1682
errno = old_errno;
1683
return 0;
1684
}
1685
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1691
struct ifreq network;
1692
unsigned int if_index = if_nametoindex(interface);
1693
if(if_index == 0){
1694
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1695
errno = old_errno;
1696
return ENXIO;
1697
}
1698
if(interface_is_up(interface)){
1699
if(not get_flags(interface, &network) and debug){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
return ret_errno;
1704
}
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1709
ret_errno = errno;
1710
perror_plus("socket");
1711
errno = old_errno;
1712
return ret_errno;
1713
}
1714
1715
if(debug){
1716
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1717
interface);
1718
}
1719
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1728
1729
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1731
if(ret == -1){
1732
perror_plus("close");
1733
}
1734
1735
if(ret_setflags == -1){
1736
errno = ret_errno;
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
errno = old_errno;
1739
return ret_errno;
1740
}
1741
} else if(debug){
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1743
interface);
1744
}
1745
1746
errno = old_errno;
1747
return 0;
1748
}
1749
1750
978
int main(int argc, char *argv[]){
1751
979
AvahiSServiceBrowser *sb = NULL;
1752
error_t ret_errno;
980
int error;
1753
981
int ret;
1754
982
intmax_t tmpmax;
1755
983
char *tmp;
1756
984
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
char *interfaces_to_take_down = NULL;
1760
size_t interfaces_to_take_down_size = 0;
985
const char *interface = "eth0";
986
struct ifreq network;
987
int sd = -1;
988
bool take_down_interface = false;
989
uid_t uid;
990
gid_t gid;
991
char *connect_to = NULL;
1761
992
char tempdir[] = "/tmp/mandosXXXXXX";
1762
993
bool tempdir_created = false;
1763
994
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1764
995
const char *seckey = PATHDIR "/" SECKEY;
1765
996
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1768
997
1769
998
bool gnutls_initialized = false;
1770
999
bool gpgme_initialized = false;
1771
1000
float delay = 2.5f;
1772
double retry_interval = 10; /* 10s between trying a server and
1773
retrying the same server again */
1774
1001
1775
1002
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1776
1003
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1782
1009
errno = 0;
1783
1010
ret = setgid(gid);
1784
1011
if(ret == -1){
1785
perror_plus("setgid");
1012
perror("setgid");
1786
1013
}
1787
1014
1788
1015
/* Lower user privileges (temporarily) */
1789
1016
errno = 0;
1790
1017
ret = seteuid(uid);
1791
1018
if(ret == -1){
1792
perror_plus("seteuid");
1019
perror("seteuid");
1793
1020
}
1794
1021
1795
1022
if(quit_now){
1830
1057
.arg = "SECONDS",
1831
1058
.doc = "Maximum delay to wait for interface startup",
1832
1059
.group = 2 },
1833
{ .name = "retry", .key = 132,
1834
.arg = "SECONDS",
1835
.doc = "Retry interval used when denied by the Mandos server",
1836
.group = 2 },
1837
{ .name = "network-hook-dir", .key = 133,
1838
.arg = "DIR",
1839
.doc = "Directory where network hooks are located",
1840
.group = 2 },
1841
1060
/*
1842
1061
* These reproduce what we would get without ARGP_NO_HELP
1843
1062
*/
1861
1080
connect_to = arg;
1862
1081
break;
1863
1082
case 'i': /* --interface */
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1866
if(ret_errno != 0){
1867
argp_error(state, "%s", strerror(ret_errno));
1868
}
1083
interface = arg;
1869
1084
break;
1870
1085
case 's': /* --seckey */
1871
1086
seckey = arg;
1891
1106
if(errno != 0 or tmp == arg or *tmp != '\0'){
1892
1107
argp_error(state, "Bad delay");
1893
1108
}
1894
case 132: /* --retry */
1895
errno = 0;
1896
retry_interval = strtod(arg, &tmp);
1897
if(errno != 0 or tmp == arg or *tmp != '\0'
1898
or (retry_interval * 1000) > INT_MAX
1899
or retry_interval < 0){
1900
argp_error(state, "Bad retry interval");
1901
}
1902
break;
1903
case 133: /* --network-hook-dir */
1904
hookdir = arg;
1905
1109
break;
1906
1110
/*
1907
1111
* These reproduce what we would get without ARGP_NO_HELP
1914
1118
argp_state_help(state, state->out_stream,
1915
1119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1916
1120
case 'V': /* --version */
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1918
1122
exit(argp_err_exit_status);
1919
1123
break;
1920
1124
default:
1935
1139
case ENOMEM:
1936
1140
default:
1937
1141
errno = ret;
1938
perror_plus("argp_parse");
1142
perror("argp_parse");
1939
1143
exitcode = EX_OSERR;
1940
1144
goto end;
1941
1145
case EINVAL:
1943
1147
goto end;
1944
1148
}
1945
1149
}
1946
1947
{
1948
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
1950
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
1953
struct stat st;
1954
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
int seckey_fd = open(seckey, O_RDONLY);
1957
if(seckey_fd == -1){
1958
perror_plus("open");
1959
} else {
1960
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1961
if(ret == -1){
1962
perror_plus("fstat");
1963
} else {
1964
if(S_ISREG(st.st_mode)
1965
and st.st_uid == 0 and st.st_gid == 0){
1966
ret = fchown(seckey_fd, uid, gid);
1967
if(ret == -1){
1968
perror_plus("fchown");
1969
}
1970
}
1971
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
1973
}
1974
}
1975
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
int pubkey_fd = open(pubkey, O_RDONLY);
1978
if(pubkey_fd == -1){
1979
perror_plus("open");
1980
} else {
1981
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1982
if(ret == -1){
1983
perror_plus("fstat");
1984
} else {
1985
if(S_ISREG(st.st_mode)
1986
and st.st_uid == 0 and st.st_gid == 0){
1987
ret = fchown(pubkey_fd, uid, gid);
1988
if(ret == -1){
1989
perror_plus("fchown");
1990
}
1991
}
1992
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
1997
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2002
}
2003
}
2004
}
2005
2006
/* Remove empty interface names */
2007
{
2008
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2010
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2014
" \"%s\"\n", interface);
2015
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2017
interface = NULL;
2018
}
2019
}
2020
}
2021
2022
/* Run network hooks */
2023
{
2024
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2025
interfaces, interfaces_size);
2026
if(ret_errno != 0){
2027
errno = ret_errno;
2028
perror_plus("argz_append");
2029
goto end;
2030
}
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2032
if(not run_network_hooks("start", interfaces_hooks, delay)){
2033
goto end;
2034
}
2035
}
2036
1150
2037
1151
if(not debug){
2038
1152
avahi_set_log_function(empty_log);
2044
1158
srand((unsigned int) time(NULL));
2045
1159
mc.simple_poll = avahi_simple_poll_new();
2046
1160
if(mc.simple_poll == NULL){
2047
fprintf_plus(stderr,
2048
"Avahi: Failed to create simple poll object.\n");
2049
exitcode = EX_UNAVAILABLE;
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
2050
1163
goto end;
2051
1164
}
2052
1165
2053
1166
sigemptyset(&sigterm_action.sa_mask);
2054
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2055
1168
if(ret == -1){
2056
perror_plus("sigaddset");
2057
exitcode = EX_OSERR;
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
2058
1171
goto end;
2059
1172
}
2060
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2061
1174
if(ret == -1){
2062
perror_plus("sigaddset");
2063
exitcode = EX_OSERR;
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
2064
1177
goto end;
2065
1178
}
2066
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2067
1180
if(ret == -1){
2068
perror_plus("sigaddset");
2069
exitcode = EX_OSERR;
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
2070
1183
goto end;
2071
1184
}
2072
1185
/* Need to check if the handler is SIG_IGN before handling:
2075
1188
*/
2076
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2077
1190
if(ret == -1){
2078
perror_plus("sigaction");
2079
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2080
1193
}
2081
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2082
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
2083
1196
if(ret == -1){
2084
perror_plus("sigaction");
2085
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2086
1199
goto end;
2087
1200
}
2088
1201
}
2089
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2090
1203
if(ret == -1){
2091
perror_plus("sigaction");
2092
return EX_OSERR;
1204
perror("sigaction");
1205
return EXIT_FAILURE;
2093
1206
}
2094
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
2095
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2096
1209
if(ret == -1){
2097
perror_plus("sigaction");
2098
exitcode = EX_OSERR;
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
2099
1212
goto end;
2100
1213
}
2101
1214
}
2102
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2103
1216
if(ret == -1){
2104
perror_plus("sigaction");
2105
return EX_OSERR;
1217
perror("sigaction");
1218
return EXIT_FAILURE;
2106
1219
}
2107
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
2108
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2109
1222
if(ret == -1){
2110
perror_plus("sigaction");
2111
exitcode = EX_OSERR;
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
2112
1225
goto end;
2113
1226
}
2114
1227
}
2115
1228
2116
/* If no interfaces were specified, make a list */
2117
if(interfaces == NULL){
2118
struct dirent **direntries;
2119
/* Look for any good interfaces */
2120
ret = scandir(sys_class_net, &direntries, good_interface,
2121
alphasort);
2122
if(ret >= 1){
2123
/* Add all found interfaces to interfaces list */
2124
for(int i = 0; i < ret; ++i){
2125
ret_errno = argz_add(&interfaces, &interfaces_size,
2126
direntries[i]->d_name);
2127
if(ret_errno != 0){
2128
perror_plus("argz_add");
2129
continue;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2133
direntries[i]->d_name);
2134
}
2135
}
2136
free(direntries);
1229
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1249
#ifdef __linux__
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
messages about the network interface to mess up the prompt */
1252
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1254
if(ret == -1){
1255
restore_loglevel = false;
1256
perror("klogctl");
1257
}
1258
#endif /* __linux__ */
1259
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1264
#ifdef __linux__
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1267
if(ret == -1){
1268
perror("klogctl");
1269
}
1270
}
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1278
goto end;
1279
}
1280
strcpy(network.ifr_name, interface);
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1284
#ifdef __linux__
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1287
if(ret == -1){
1288
perror("klogctl");
1289
}
1290
}
1291
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1299
goto end;
1300
}
1301
if((network.ifr_flags & IFF_UP) == 0){
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
if(ret == -1){
1306
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
}
1326
/* sleep checking until interface is running */
1327
for(int i=0; i < delay * 4; i++){
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1331
} else if(network.ifr_flags & IFF_RUNNING){
1332
break;
1333
}
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
ret = nanosleep(&sleeptime, NULL);
1336
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1338
}
1339
}
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1346
}
1347
#ifdef __linux__
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1351
if(ret == -1){
1352
perror("klogctl");
1353
}
1354
}
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
2137
1364
} else {
2138
free(direntries);
2139
fprintf_plus(stderr, "Could not find a network interface\n");
2140
exitcode = EXIT_FAILURE;
2141
goto end;
2142
}
2143
}
2144
2145
/* If we only got one interface, explicitly use only that one */
2146
if(argz_count(interfaces, interfaces_size) == 1){
2147
if(debug){
2148
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2149
interfaces);
2150
}
2151
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2152
}
2153
2154
/* Bring up interfaces which are down */
2155
if(not (argz_count(interfaces, interfaces_size) == 1
2156
and strcmp(interfaces, "none") == 0)){
2157
char *interface = NULL;
2158
while((interface = argz_next(interfaces, interfaces_size,
2159
interface))){
2160
bool interface_was_up = interface_is_up(interface);
2161
ret = bring_up_interface(interface, delay);
2162
if(not interface_was_up){
2163
if(ret != 0){
2164
errno = ret;
2165
perror_plus("Failed to bring up interface");
2166
} else {
2167
ret_errno = argz_add(&interfaces_to_take_down,
2168
&interfaces_to_take_down_size,
2169
interface);
2170
}
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
2171
1369
}
2172
1370
}
2173
free(interfaces);
2174
interfaces = NULL;
2175
interfaces_size = 0;
2176
if(debug and (interfaces_to_take_down == NULL)){
2177
fprintf_plus(stderr, "No interfaces were brought up\n");
2178
}
2179
1371
}
2180
1372
2181
1373
if(quit_now){
2184
1376
2185
1377
ret = init_gnutls_global(pubkey, seckey);
2186
1378
if(ret == -1){
2187
fprintf_plus(stderr, "init_gnutls_global failed\n");
2188
exitcode = EX_UNAVAILABLE;
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2189
1381
goto end;
2190
1382
} else {
2191
1383
gnutls_initialized = true;
2195
1387
goto end;
2196
1388
}
2197
1389
1390
tempdir_created = true;
2198
1391
if(mkdtemp(tempdir) == NULL){
2199
perror_plus("mkdtemp");
1392
tempdir_created = false;
1393
perror("mkdtemp");
2200
1394
goto end;
2201
1395
}
2202
tempdir_created = true;
2203
1396
2204
1397
if(quit_now){
2205
1398
goto end;
2206
1399
}
2207
1400
2208
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
2209
fprintf_plus(stderr, "init_gpgme failed\n");
2210
exitcode = EX_UNAVAILABLE;
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2211
1404
goto end;
2212
1405
} else {
2213
1406
gpgme_initialized = true;
2221
1414
/* Connect directly, do not use Zeroconf */
2222
1415
/* (Mainly meant for debugging) */
2223
1416
char *address = strrchr(connect_to, ':');
2224
2225
1417
if(address == NULL){
2226
fprintf_plus(stderr, "No colon in address\n");
2227
exitcode = EX_USAGE;
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2228
1420
goto end;
2229
1421
}
2230
1422
2232
1424
goto end;
2233
1425
}
2234
1426
2235
in_port_t port;
1427
uint16_t port;
2236
1428
errno = 0;
2237
1429
tmpmax = strtoimax(address+1, &tmp, 10);
2238
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2239
or tmpmax != (in_port_t)tmpmax){
2240
fprintf_plus(stderr, "Bad port number\n");
2241
exitcode = EX_USAGE;
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2242
1434
goto end;
2243
1435
}
2244
1436
2246
1438
goto end;
2247
1439
}
2248
1440
2249
port = (in_port_t)tmpmax;
1441
port = (uint16_t)tmpmax;
2250
1442
*address = '\0';
1443
address = connect_to;
2251
1444
/* Colon in address indicates IPv6 */
2252
1445
int af;
2253
if(strchr(connect_to, ':') != NULL){
1446
if(strchr(address, ':') != NULL){
2254
1447
af = AF_INET6;
2255
/* Accept [] around IPv6 address - see RFC 5952 */
2256
if(connect_to[0] == '[' and address[-1] == ']')
2257
{
2258
connect_to++;
2259
address[-1] = '\0';
2260
}
2261
1448
} else {
2262
1449
af = AF_INET;
2263
1450
}
2264
address = connect_to;
2265
1451
2266
1452
if(quit_now){
2267
1453
goto end;
2268
1454
}
2269
1455
2270
while(not quit_now){
2271
ret = start_mandos_communication(address, port, if_index, af);
2272
if(quit_now or ret == 0){
2273
break;
2274
}
2275
if(debug){
2276
fprintf_plus(stderr, "Retrying in %d seconds\n",
2277
(int)retry_interval);
2278
}
2279
sleep((int)retry_interval);
2280
}
2281
2282
if (not quit_now){
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2283
1460
exitcode = EXIT_SUCCESS;
2284
1461
}
2285
2286
1462
goto end;
2287
1463
}
2288
1464
2302
1478
/* Allocate a new server */
2303
1479
mc.server = avahi_server_new(avahi_simple_poll_get
2304
1480
(mc.simple_poll), &config, NULL,
2305
NULL, &ret_errno);
1481
NULL, &error);
2306
1482
2307
1483
/* Free the Avahi configuration data */
2308
1484
avahi_server_config_free(&config);
2310
1486
2311
1487
/* Check if creating the Avahi server object succeeded */
2312
1488
if(mc.server == NULL){
2313
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2314
avahi_strerror(ret_errno));
2315
exitcode = EX_UNAVAILABLE;
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2316
1492
goto end;
2317
1493
}
2318
1494
2325
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2326
1502
NULL, 0, browse_callback, NULL);
2327
1503
if(sb == NULL){
2328
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2329
avahi_strerror(avahi_server_errno(mc.server)));
2330
exitcode = EX_UNAVAILABLE;
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
2331
1507
goto end;
2332
1508
}
2333
1509
2338
1514
/* Run the main loop */
2339
1515
2340
1516
if(debug){
2341
fprintf_plus(stderr, "Starting Avahi loop search\n");
2342
}
2343
2344
ret = avahi_loop_with_timeout(mc.simple_poll,
2345
(int)(retry_interval * 1000));
2346
if(debug){
2347
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2348
(ret == 0) ? "successfully" : "with error");
2349
}
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
2350
1521
2351
1522
end:
2352
1523
2353
1524
if(debug){
2354
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2355
1526
}
2356
1527
2357
1528
/* Cleanup things */
2374
1545
gpgme_release(mc.ctx);
2375
1546
}
2376
1547
2377
/* Cleans up the circular linked list of Mandos servers the client
2378
has seen */
2379
if(mc.current_server != NULL){
2380
mc.current_server->prev->next = NULL;
2381
while(mc.current_server != NULL){
2382
server *next = mc.current_server->next;
2383
free(mc.current_server);
2384
mc.current_server = next;
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
2385
1555
}
2386
}
2387
2388
/* Re-raise priviliges */
2389
{
2390
raise_privileges();
2391
2392
/* Run network hooks */
2393
run_network_hooks("stop", interfaces_hooks, delay);
2394
2395
/* Take down the network interfaces which were brought up */
2396
{
2397
char *interface = NULL;
2398
while((interface=argz_next(interfaces_to_take_down,
2399
interfaces_to_take_down_size,
2400
interface))){
2401
ret_errno = take_down_interface(interface);
2402
if(ret_errno != 0){
2403
errno = ret_errno;
2404
perror_plus("Failed to take down interface");
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
2405
1565
}
2406
1566
}
2407
if(debug and (interfaces_to_take_down == NULL)){
2408
fprintf_plus(stderr, "No interfaces needed to be taken"
2409
" down\n");
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
2410
1576
}
2411
1577
}
2412
2413
lower_privileges_permanently();
2414
1578
}
2415
1579
2416
free(interfaces_to_take_down);
2417
free(interfaces_hooks);
2418
2419
/* Removes the GPGME temp directory and all files inside */
1580
/* Removes the temp directory used by GPGME */
2420
1581
if(tempdir_created){
2421
struct dirent **direntries = NULL;
2422
struct dirent *direntry = NULL;
2423
int numentries = scandir(tempdir, &direntries, notdotentries,
2424
alphasort);
2425
if (numentries > 0){
2426
for(int i = 0; i < numentries; i++){
2427
direntry = direntries[i];
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
2428
1602
char *fullname = NULL;
2429
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
2430
1604
direntry->d_name);
2431
1605
if(ret < 0){
2432
perror_plus("asprintf");
1606
perror("asprintf");
2433
1607
continue;
2434
1608
}
2435
1609
ret = remove(fullname);
2436
1610
if(ret == -1){
2437
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2438
strerror(errno));
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
2439
1613
}
2440
1614
free(fullname);
2441
1615
}
2442
}
2443
2444
/* need to clean even if 0 because man page doesn't specify */
2445
free(direntries);
2446
if (numentries == -1){
2447
perror_plus("scandir");
1616
closedir(d);
2448
1617
}
2449
1618
ret = rmdir(tempdir);
2450
1619
if(ret == -1 and errno != ENOENT){
2451
perror_plus("rmdir");
1620
perror("rmdir");
2452
1621
}
2453
1622
}
2454
1623
2459
1628
&old_sigterm_action,
2460
1629
NULL));
2461
1630
if(ret == -1){
2462
perror_plus("sigaction");
1631
perror("sigaction");
2463
1632
}
2464
1633
do {
2465
1634
ret = raise(signal_received);
2466
1635
} while(ret != 0 and errno == EINTR);
2467
1636
if(ret != 0){
2468
perror_plus("raise");
1637
perror("raise");
2469
1638
abort();
2470
1639
}
2471
1640
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0