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» Revision
237.2.170
(compared to revision 237.7.149)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-11-10 03:45:18 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091110034518-2ofins935ffqbbse
* mandos-monitor (MandosClientWidget): Change "StopChecker" key to "S"
and changed "CheckedOK" key to
"C".
(UserInterface.__init__): Show version number and brief help on start.
(UserInterface.process_input): Help key now shows help in log
buffer, and shows log buffer if
hidden. Commented out
non-implemented keys.
and changed "CheckedOK" key to
"C".
(UserInterface.__init__): Show version number and brief help on start.
(UserInterface.process_input): Help key now shows help in log
buffer, and shows log buffer if
hidden. Commented out
non-implemented keys.
- 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
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
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() */
94
87
95
88
#ifdef __linux__
96
89
#include <sys/klog.h> /* klogctl() */
114
107
init_gnutls_session(),
115
108
GNUTLS_* */
116
109
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
119
112
120
113
/* GPGME */
121
114
#include <gpgme.h> /* All GPGME types, constants and
129
122
#define PATHDIR "/conf/conf.d/mandos"
130
123
#define SECKEY "seckey.txt"
131
124
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
125
134
126
bool debug = false;
135
127
static const char mandos_protocol_version[] = "1";
136
128
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;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
154
130
155
131
/* Used for passing in values through the Avahi callback functions */
156
132
typedef struct {
133
AvahiSimplePoll *simple_poll;
157
134
AvahiServer *server;
158
135
gnutls_certificate_credentials_t cred;
159
136
unsigned int dh_bits;
160
137
gnutls_dh_params_t dh_params;
161
138
const char *priority;
162
139
gpgme_ctx_t ctx;
163
server *current_server;
164
140
} mandos_context;
165
141
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
171
146
172
147
sig_atomic_t quit_now = 0;
173
148
int signal_received = 0;
174
149
175
/* Function to use when printing errors */
176
void perror_plus(const char *print_text){
177
int e = errno;
178
fprintf(stderr, "Mandos plugin %s: ",
179
program_invocation_short_name);
180
errno = e;
181
perror(print_text);
182
}
183
184
__attribute__((format (gnu_printf, 2, 3)))
185
int fprintf_plus(FILE *stream, const char *format, ...){
186
va_list ap;
187
va_start (ap, format);
188
189
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
}
193
194
150
/*
195
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
196
152
* bytes. "buffer_capacity" is how much is currently allocated,
197
153
* "buffer_length" is how much is already used.
198
154
*/
199
155
size_t incbuffer(char **buffer, size_t buffer_length,
200
size_t buffer_capacity){
156
size_t buffer_capacity){
201
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
159
if(buffer == NULL){
208
164
return buffer_capacity;
209
165
}
210
166
211
/* Add server to set of servers to retry periodically */
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
214
int ret;
215
server *new_server = malloc(sizeof(server));
216
if(new_server == NULL){
217
perror_plus("malloc");
218
return false;
219
}
220
*new_server = (server){ .ip = strdup(ip),
221
.port = port,
222
.if_index = if_index,
223
.af = af };
224
if(new_server->ip == NULL){
225
perror_plus("strdup");
226
return false;
227
}
228
/* Special case of first server */
229
if (mc.current_server == NULL){
230
new_server->next = new_server;
231
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
234
} else {
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
237
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
244
}
245
return true;
246
}
247
248
167
/*
249
168
* Initialize GPGME.
250
169
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
253
172
gpgme_error_t rc;
254
173
gpgme_engine_info_t engine_info;
255
174
175
256
176
/*
257
177
* Helper function to insert pub and seckey to the engine keyring.
258
178
*/
263
183
264
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
265
185
if(fd == -1){
266
perror_plus("open");
186
perror("open");
267
187
return false;
268
188
}
269
189
270
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
271
191
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
274
194
return false;
275
195
}
276
196
277
197
rc = gpgme_op_import(mc.ctx, pgp_data);
278
198
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
281
201
return false;
282
202
}
283
203
284
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
205
if(ret == -1){
286
perror_plus("close");
206
perror("close");
287
207
}
288
208
gpgme_data_release(pgp_data);
289
209
return true;
290
210
}
291
211
292
212
if(debug){
293
fprintf_plus(stderr, "Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
294
214
}
295
215
296
216
/* Init GPGME */
297
217
gpgme_check_version(NULL);
298
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
299
219
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
302
222
return false;
303
223
}
304
224
305
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
306
226
rc = gpgme_get_engine_info(&engine_info);
307
227
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
310
230
return false;
311
231
}
312
232
while(engine_info != NULL){
318
238
engine_info = engine_info->next;
319
239
}
320
240
if(engine_info == NULL){
321
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
322
tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
242
return false;
324
243
}
325
244
326
245
/* Create new GPGME "context" */
327
246
rc = gpgme_new(&(mc.ctx));
328
247
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
331
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
332
250
return false;
333
251
}
334
252
353
271
ssize_t plaintext_length = 0;
354
272
355
273
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
275
}
358
276
359
277
/* Create new GPGME data buffer from memory cryptotext */
360
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
279
0);
362
280
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
365
283
return -1;
366
284
}
367
285
368
286
/* Create new empty GPGME data buffer for the plaintext */
369
287
rc = gpgme_data_new(&dh_plain);
370
288
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
374
291
gpgme_data_release(dh_crypto);
375
292
return -1;
376
293
}
379
296
data buffer */
380
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
298
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
384
301
plaintext_length = -1;
385
302
if(debug){
386
303
gpgme_decrypt_result_t result;
387
304
result = gpgme_op_decrypt_result(mc.ctx);
388
305
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
307
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
395
312
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
397
314
}
398
315
gpgme_recipient_t recipient;
399
316
recipient = result->recipients;
400
317
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
408
324
recipient = recipient->next;
409
325
}
410
326
}
413
329
}
414
330
415
331
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
333
}
418
334
419
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
422
338
plaintext_length = -1;
423
339
goto decrypt_end;
424
340
}
426
342
*plaintext = NULL;
427
343
while(true){
428
344
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
431
347
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
435
351
}
436
352
437
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
442
358
break;
443
359
}
444
360
if(ret < 0){
445
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
446
362
plaintext_length = -1;
447
363
goto decrypt_end;
448
364
}
450
366
}
451
367
452
368
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
454
370
for(ssize_t i = 0; i < plaintext_length; i++){
455
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
372
}
468
384
}
469
385
470
386
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
472
389
if(ret == NULL)
473
390
ret = "(unknown)";
474
391
return ret;
477
394
/* GnuTLS log function callback */
478
395
static void debuggnutls(__attribute__((unused)) int level,
479
396
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
481
398
}
482
399
483
400
static int init_gnutls_global(const char *pubkeyfilename,
485
402
int ret;
486
403
487
404
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
489
406
}
490
407
491
408
ret = gnutls_global_init();
492
409
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
495
412
return -1;
496
413
}
497
414
504
421
}
505
422
506
423
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
508
425
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
511
431
gnutls_global_deinit();
512
432
return -1;
513
433
}
514
434
515
435
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
520
439
}
521
440
522
441
ret = gnutls_certificate_set_openpgp_key_file
523
442
(mc.cred, pubkeyfilename, seckeyfilename,
524
443
GNUTLS_OPENPGP_FMT_BASE64);
525
444
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
531
450
goto globalfail;
532
451
}
533
452
534
453
/* GnuTLS server initialization */
535
454
ret = gnutls_dh_params_init(&mc.dh_params);
536
455
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
540
458
goto globalfail;
541
459
}
542
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
461
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
546
464
goto globalfail;
547
465
}
548
466
568
486
}
569
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
488
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
574
491
}
575
492
576
493
{
583
500
}
584
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
502
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
589
506
gnutls_deinit(*session);
590
507
return -1;
591
508
}
600
517
}
601
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
519
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
605
522
gnutls_deinit(*session);
606
523
return -1;
607
524
}
619
536
__attribute__((unused)) const char *txt){}
620
537
621
538
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
539
static int start_mandos_communication(const char *ip, uint16_t port,
623
540
AvahiIfIndex if_index,
624
541
int af){
625
542
int ret, tcp_sd = -1;
652
569
pf = PF_INET;
653
570
break;
654
571
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
656
573
errno = EINVAL;
657
574
return -1;
658
575
}
663
580
}
664
581
665
582
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
668
585
}
669
586
670
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
588
if(tcp_sd < 0){
672
589
int e = errno;
673
perror_plus("socket");
590
perror("socket");
674
591
errno = e;
675
592
goto mandos_end;
676
593
}
690
607
}
691
608
if(ret < 0 ){
692
609
int e = errno;
693
perror_plus("inet_pton");
610
perror("inet_pton");
694
611
errno = e;
695
612
goto mandos_end;
696
613
}
697
614
if(ret == 0){
698
615
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
700
617
errno = e;
701
618
goto mandos_end;
702
619
}
703
620
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
705
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
627
-Wunreachable-code*/
708
628
if(if_index == AVAHI_IF_UNSPEC){
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
711
631
errno = EINVAL;
712
632
goto mandos_end;
713
633
}
729
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
730
650
char interface[IF_NAMESIZE];
731
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
perror_plus("if_indextoname");
652
perror("if_indextoname");
733
653
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
736
656
}
737
657
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
740
660
}
741
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
749
669
sizeof(addrstr));
750
670
}
751
671
if(pcret == NULL){
752
perror_plus("inet_ntop");
672
perror("inet_ntop");
753
673
} else {
754
674
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
676
}
757
677
}
758
678
}
768
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
689
}
770
690
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
691
int e = errno;
692
perror("connect");
693
errno = e;
776
694
goto mandos_end;
777
695
}
778
696
786
704
while(true){
787
705
size_t out_size = strlen(out);
788
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
789
out_size - written));
707
out_size - written));
790
708
if(ret == -1){
791
709
int e = errno;
792
perror_plus("write");
710
perror("write");
793
711
errno = e;
794
712
goto mandos_end;
795
713
}
812
730
}
813
731
814
732
if(debug){
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
734
}
817
735
818
736
if(quit_now){
820
738
goto mandos_end;
821
739
}
822
740
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
828
742
829
743
if(quit_now){
830
744
errno = EINTR;
841
755
842
756
if(ret != GNUTLS_E_SUCCESS){
843
757
if(debug){
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
759
gnutls_perror(ret);
846
760
}
847
761
errno = EPROTO;
851
765
/* Read OpenPGP packet that contains the wanted password */
852
766
853
767
if(debug){
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
856
770
}
857
771
858
772
while(true){
863
777
}
864
778
865
779
buffer_capacity = incbuffer(&buffer, buffer_length,
866
buffer_capacity);
780
buffer_capacity);
867
781
if(buffer_capacity == 0){
868
782
int e = errno;
869
perror_plus("incbuffer");
783
perror("incbuffer");
870
784
errno = e;
871
785
goto mandos_end;
872
786
}
896
810
}
897
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
898
812
if(ret < 0){
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
814
gnutls_perror(ret);
902
815
errno = EPROTO;
903
816
goto mandos_end;
904
817
}
905
818
break;
906
819
default:
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
909
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
823
errno = EIO;
911
824
goto mandos_end;
916
829
}
917
830
918
831
if(debug){
919
fprintf_plus(stderr, "Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
920
833
}
921
834
922
835
if(quit_now){
934
847
935
848
if(buffer_length > 0){
936
849
ssize_t decrypted_buffer_size;
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
938
852
&decrypted_buffer);
939
853
if(decrypted_buffer_size >= 0){
940
854
951
865
if(ret == 0 and ferror(stdout)){
952
866
int e = errno;
953
867
if(debug){
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
956
870
}
957
871
errno = e;
958
872
goto mandos_end;
977
891
if(e == 0){
978
892
e = errno;
979
893
}
980
perror_plus("close");
894
perror("close");
981
895
}
982
896
gnutls_deinit(session);
983
errno = e;
984
897
if(quit_now){
985
errno = EINTR;
898
e = EINTR;
986
899
retval = -1;
987
900
}
901
errno = e;
988
902
}
989
903
return retval;
990
904
}
1003
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
918
flags,
1005
919
AVAHI_GCC_UNUSED void* userdata){
1006
if(r == NULL){
1007
return;
1008
}
920
assert(r);
1009
921
1010
922
/* Called whenever a service has been resolved successfully or
1011
923
timed out */
1017
929
switch(event){
1018
930
default:
1019
931
case AVAHI_RESOLVER_FAILURE:
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1024
935
break;
1025
936
1026
937
case AVAHI_RESOLVER_FOUND:
1028
939
char ip[AVAHI_ADDRESS_STR_MAX];
1029
940
avahi_address_snprint(ip, sizeof(ip), address);
1030
941
if(debug){
1031
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1032
PRIdMAX ") on port %" PRIu16 "\n", name,
1033
host_name, ip, (intmax_t)interface, port);
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1034
945
}
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
946
int ret = start_mandos_communication(ip, port, interface,
1037
947
avahi_proto_to_af(proto));
1038
948
if(ret == 0){
1039
avahi_simple_poll_quit(simple_poll);
1040
} else {
1041
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
949
avahi_simple_poll_quit(mc.simple_poll);
1046
950
}
1047
951
}
1048
952
}
1059
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
964
flags,
1061
965
AVAHI_GCC_UNUSED void* userdata){
1062
if(b == NULL){
1063
return;
1064
}
966
assert(b);
1065
967
1066
968
/* Called whenever a new services becomes available on the LAN or
1067
969
is removed from the LAN */
1074
976
default:
1075
977
case AVAHI_BROWSER_FAILURE:
1076
978
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1079
avahi_simple_poll_quit(simple_poll);
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
1080
982
return;
1081
983
1082
984
case AVAHI_BROWSER_NEW:
1088
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
991
name, type, domain, protocol, 0,
1090
992
resolve_callback, NULL) == NULL)
1091
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1094
995
break;
1095
996
1096
997
case AVAHI_BROWSER_REMOVE:
1099
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1100
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1101
1002
if(debug){
1102
fprintf_plus(stderr, "No Mandos server found, still"
1103
" searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
1004
}
1105
1005
break;
1106
1006
}
1107
1007
}
1108
1008
1109
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1110
1010
static void handle_sigterm(int sig){
1111
1011
if(quit_now){
1112
1012
return;
1114
1014
quit_now = 1;
1115
1015
signal_received = sig;
1116
1016
int old_errno = errno;
1117
/* set main loop to exit */
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1120
}
1121
errno = old_errno;
1122
}
1123
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
int ret;
1126
error_t ret_errno;
1127
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
if(s < 0){
1130
ret_errno = errno;
1131
perror_plus("socket");
1132
errno = ret_errno;
1133
return false;
1134
}
1135
strcpy(ifr->ifr_name, ifname);
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
if(ret == -1){
1138
if(debug){
1139
ret_errno = errno;
1140
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1142
}
1143
return false;
1144
}
1145
return true;
1146
}
1147
1148
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1150
/* Reject the loopback device */
1151
if(ifr->ifr_flags & IFF_LOOPBACK){
1152
if(debug){
1153
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1154
ifname);
1155
}
1156
return false;
1157
}
1158
/* Accept point-to-point devices only if connect_to is specified */
1159
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1160
if(debug){
1161
fprintf_plus(stderr, "Accepting point-to-point interface"
1162
" \"%s\"\n", ifname);
1163
}
1164
return true;
1165
}
1166
/* Otherwise, reject non-broadcast-capable devices */
1167
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1168
if(debug){
1169
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1170
" \"%s\"\n", ifname);
1171
}
1172
return false;
1173
}
1174
/* Reject non-ARP interfaces (including dummy interfaces) */
1175
if(ifr->ifr_flags & IFF_NOARP){
1176
if(debug){
1177
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1178
ifname);
1179
}
1180
return false;
1181
}
1182
1183
/* Accept this device */
1184
if(debug){
1185
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1186
}
1187
return true;
1188
}
1189
1190
/*
1191
* This function determines if a directory entry in /sys/class/net
1192
* corresponds to an acceptable network device.
1193
* (This function is passed to scandir(3) as a filter function.)
1194
*/
1195
int good_interface(const struct dirent *if_entry){
1196
if(if_entry->d_name[0] == '.'){
1197
return 0;
1198
}
1199
1200
struct ifreq ifr;
1201
if(not get_flags(if_entry->d_name, &ifr)){
1202
if(debug){
1203
fprintf_plus(stderr, "Failed to get flags for interface "
1204
"\"%s\"\n", if_entry->d_name);
1205
}
1206
return 0;
1207
}
1208
1209
if(not good_flags(if_entry->d_name, &ifr)){
1210
return 0;
1211
}
1212
return 1;
1213
}
1214
1215
/*
1216
* This function determines if a network interface is up.
1217
*/
1218
bool interface_is_up(const char *interface){
1219
struct ifreq ifr;
1220
if(not get_flags(interface, &ifr)){
1221
if(debug){
1222
fprintf_plus(stderr, "Failed to get flags for interface "
1223
"\"%s\"\n", interface);
1224
}
1225
return false;
1226
}
1227
1228
return (bool)(ifr.ifr_flags & IFF_UP);
1229
}
1230
1231
/*
1232
* This function determines if a network interface is running
1233
*/
1234
bool interface_is_running(const char *interface){
1235
struct ifreq ifr;
1236
if(not get_flags(interface, &ifr)){
1237
if(debug){
1238
fprintf_plus(stderr, "Failed to get flags for interface "
1239
"\"%s\"\n", interface);
1240
}
1241
return false;
1242
}
1243
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
}
1246
1247
int notdotentries(const struct dirent *direntry){
1248
/* Skip "." and ".." */
1249
if(direntry->d_name[0] == '.'
1250
and (direntry->d_name[1] == '\0'
1251
or (direntry->d_name[1] == '.'
1252
and direntry->d_name[2] == '\0'))){
1253
return 0;
1254
}
1255
return 1;
1256
}
1257
1258
/* Is this directory entry a runnable program? */
1259
int runnable_hook(const struct dirent *direntry){
1260
int ret;
1261
size_t sret;
1262
struct stat st;
1263
1264
if((direntry->d_name)[0] == '\0'){
1265
/* Empty name? */
1266
return 0;
1267
}
1268
1269
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
"abcdefghijklmnopqrstuvwxyz"
1271
"0123456789"
1272
"_-");
1273
if((direntry->d_name)[sret] != '\0'){
1274
/* Contains non-allowed characters */
1275
if(debug){
1276
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1277
direntry->d_name);
1278
}
1279
return 0;
1280
}
1281
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1290
if(ret == -1){
1291
if(debug){
1292
perror_plus("Could not stat hook");
1293
}
1294
return 0;
1295
}
1296
if(not (S_ISREG(st.st_mode))){
1297
/* Not a regular file */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1305
/* Not executable */
1306
if(debug){
1307
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
if(debug){
1313
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1314
direntry->d_name);
1315
}
1316
return 1;
1317
}
1318
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1320
int ret;
1321
struct timespec now;
1322
struct timespec waited_time;
1323
intmax_t block_time;
1324
1325
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1328
fprintf_plus(stderr, "Wait until first server is found."
1329
" No timeout!\n");
1330
}
1331
ret = avahi_simple_poll_iterate(s, -1);
1332
} else {
1333
if (debug){
1334
fprintf_plus(stderr, "Check current_server if we should run"
1335
" it, or wait\n");
1336
}
1337
/* the current time */
1338
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1339
if(ret == -1){
1340
perror_plus("clock_gettime");
1341
return -1;
1342
}
1343
/* Calculating in ms how long time between now and server
1344
who we visted longest time ago. Now - last seen. */
1345
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1347
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1349
/* total time is 10s/10,000ms.
1350
Converting to s from ms by dividing by 1,000,
1351
and ns to ms by dividing by 1,000,000. */
1352
block_time = ((retry_interval
1353
- ((intmax_t)waited_time.tv_sec * 1000))
1354
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1356
if (debug){
1357
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
block_time);
1359
}
1360
1361
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
mc.current_server->af);
1366
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1368
return 0;
1369
}
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1372
if(ret == -1){
1373
perror_plus("clock_gettime");
1374
return -1;
1375
}
1376
mc.current_server = mc.current_server->next;
1377
block_time = 0; /* Call avahi to find new Mandos
1378
servers, but don't block */
1379
}
1380
1381
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
}
1383
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1385
return (ret != 1) ? ret : 0;
1386
}
1387
}
1388
}
1389
}
1390
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1444
const float delay){
1445
struct dirent **direntries;
1446
struct dirent *direntry;
1447
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1458
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1465
if(ret < 0){
1466
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1525
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1537
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
1574
}
1575
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
1582
struct ifreq network;
1583
unsigned int if_index = if_nametoindex(interface);
1584
if(if_index == 0){
1585
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1586
errno = old_errno;
1587
return ENXIO;
1588
}
1589
1590
if(quit_now){
1591
errno = old_errno;
1592
return EINTR;
1593
}
1594
1595
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
1597
ret_errno = errno;
1598
fprintf_plus(stderr, "Failed to get flags for interface "
1599
"\"%s\"\n", interface);
1600
return ret_errno;
1601
}
1602
network.ifr_flags |= IFF_UP;
1603
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
1606
ret_errno = errno;
1607
perror_plus("socket");
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
if(quit_now){
1613
close(sd);
1614
errno = old_errno;
1615
return EINTR;
1616
}
1617
1618
if(debug){
1619
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1620
interface);
1621
}
1622
1623
/* Raise priviliges */
1624
raise_privileges();
1625
1626
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
1634
}
1635
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
1638
#ifdef __linux__
1639
if(restore_loglevel){
1640
ret_linux = klogctl(7, NULL, 0);
1641
if(ret_linux == -1){
1642
perror_plus("klogctl");
1643
}
1644
}
1645
#endif /* __linux__ */
1646
1647
/* Lower privileges */
1648
lower_privileges();
1649
1650
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1652
if(ret == -1){
1653
perror_plus("close");
1654
}
1655
1656
if(ret_setflags == -1){
1657
errno = ret_errno;
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
errno = old_errno;
1660
return ret_errno;
1661
}
1662
} else if(debug){
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1664
interface);
1665
}
1666
1667
/* Sleep checking until interface is running.
1668
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
1670
if(interface_is_running(interface)){
1671
break;
1672
}
1673
struct timespec sleeptime = { .tv_nsec = 250000000 };
1674
ret = nanosleep(&sleeptime, NULL);
1675
if(ret == -1 and errno != EINTR){
1676
perror_plus("nanosleep");
1677
}
1678
}
1679
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
struct ifreq network;
1690
unsigned int if_index = if_nametoindex(interface);
1691
if(if_index == 0){
1692
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1693
errno = old_errno;
1694
return ENXIO;
1695
}
1696
if(interface_is_up(interface)){
1697
if(not get_flags(interface, &network) and debug){
1698
ret_errno = errno;
1699
fprintf_plus(stderr, "Failed to get flags for interface "
1700
"\"%s\"\n", interface);
1701
return ret_errno;
1702
}
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
1707
ret_errno = errno;
1708
perror_plus("socket");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
1713
if(debug){
1714
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1715
interface);
1716
}
1717
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
1726
1727
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
if(ret == -1){
1730
perror_plus("close");
1731
}
1732
1733
if(ret_setflags == -1){
1734
errno = ret_errno;
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
errno = old_errno;
1737
return ret_errno;
1738
}
1739
} else if(debug){
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
interface);
1742
}
1743
1744
errno = old_errno;
1745
return 0;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1746
1021
}
1747
1022
1748
1023
int main(int argc, char *argv[]){
1749
1024
AvahiSServiceBrowser *sb = NULL;
1750
error_t ret_errno;
1025
int error;
1751
1026
int ret;
1752
1027
intmax_t tmpmax;
1753
1028
char *tmp;
1754
1029
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
char *interfaces_to_take_down = NULL;
1758
size_t interfaces_to_take_down_size = 0;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1759
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1760
1038
bool tempdir_created = false;
1761
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
1040
const char *seckey = PATHDIR "/" SECKEY;
1763
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
1042
1767
1043
bool gnutls_initialized = false;
1768
1044
bool gpgme_initialized = false;
1769
1045
float delay = 2.5f;
1770
double retry_interval = 10; /* 10s between trying a server and
1771
retrying the same server again */
1772
1046
1773
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1774
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1780
1054
errno = 0;
1781
1055
ret = setgid(gid);
1782
1056
if(ret == -1){
1783
perror_plus("setgid");
1057
perror("setgid");
1784
1058
}
1785
1059
1786
1060
/* Lower user privileges (temporarily) */
1787
1061
errno = 0;
1788
1062
ret = seteuid(uid);
1789
1063
if(ret == -1){
1790
perror_plus("seteuid");
1064
perror("seteuid");
1791
1065
}
1792
1066
1793
1067
if(quit_now){
1828
1102
.arg = "SECONDS",
1829
1103
.doc = "Maximum delay to wait for interface startup",
1830
1104
.group = 2 },
1831
{ .name = "retry", .key = 132,
1832
.arg = "SECONDS",
1833
.doc = "Retry interval used when denied by the Mandos server",
1834
.group = 2 },
1835
{ .name = "network-hook-dir", .key = 133,
1836
.arg = "DIR",
1837
.doc = "Directory where network hooks are located",
1838
.group = 2 },
1839
1105
/*
1840
1106
* These reproduce what we would get without ARGP_NO_HELP
1841
1107
*/
1859
1125
connect_to = arg;
1860
1126
break;
1861
1127
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
1864
if(ret_errno != 0){
1865
argp_error(state, "%s", strerror(ret_errno));
1866
}
1128
interface = arg;
1867
1129
break;
1868
1130
case 's': /* --seckey */
1869
1131
seckey = arg;
1889
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1890
1152
argp_error(state, "Bad delay");
1891
1153
}
1892
case 132: /* --retry */
1893
errno = 0;
1894
retry_interval = strtod(arg, &tmp);
1895
if(errno != 0 or tmp == arg or *tmp != '\0'
1896
or (retry_interval * 1000) > INT_MAX
1897
or retry_interval < 0){
1898
argp_error(state, "Bad retry interval");
1899
}
1900
break;
1901
case 133: /* --network-hook-dir */
1902
hookdir = arg;
1903
1154
break;
1904
1155
/*
1905
1156
* These reproduce what we would get without ARGP_NO_HELP
1912
1163
argp_state_help(state, state->out_stream,
1913
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1914
1165
case 'V': /* --version */
1915
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1916
1167
exit(argp_err_exit_status);
1917
1168
break;
1918
1169
default:
1933
1184
case ENOMEM:
1934
1185
default:
1935
1186
errno = ret;
1936
perror_plus("argp_parse");
1187
perror("argp_parse");
1937
1188
exitcode = EX_OSERR;
1938
1189
goto end;
1939
1190
case EINVAL:
1941
1192
goto end;
1942
1193
}
1943
1194
}
1944
1945
{
1946
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
1948
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
1951
struct stat st;
1952
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1954
int seckey_fd = open(seckey, O_RDONLY);
1955
if(seckey_fd == -1){
1956
perror_plus("open");
1957
} else {
1958
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1959
if(ret == -1){
1960
perror_plus("fstat");
1961
} else {
1962
if(S_ISREG(st.st_mode)
1963
and st.st_uid == 0 and st.st_gid == 0){
1964
ret = fchown(seckey_fd, uid, gid);
1965
if(ret == -1){
1966
perror_plus("fchown");
1967
}
1968
}
1969
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
1971
}
1972
}
1973
1974
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
int pubkey_fd = open(pubkey, O_RDONLY);
1976
if(pubkey_fd == -1){
1977
perror_plus("open");
1978
} else {
1979
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1980
if(ret == -1){
1981
perror_plus("fstat");
1982
} else {
1983
if(S_ISREG(st.st_mode)
1984
and st.st_uid == 0 and st.st_gid == 0){
1985
ret = fchown(pubkey_fd, uid, gid);
1986
if(ret == -1){
1987
perror_plus("fchown");
1988
}
1989
}
1990
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
1995
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2000
}
2001
}
2002
}
2003
2004
/* Remove empty interface names */
2005
{
2006
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2008
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2012
" \"%s\"\n", interface);
2013
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2015
interface = NULL;
2016
}
2017
}
2018
}
2019
2020
/* Run network hooks */
2021
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2025
if(interfaces_hooks == NULL){
2026
perror_plus("malloc");
2027
goto end;
2028
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
2038
}
2039
1195
2040
1196
if(not debug){
2041
1197
avahi_set_log_function(empty_log);
2045
1201
from the signal handler */
2046
1202
/* Initialize the pseudo-RNG for Avahi */
2047
1203
srand((unsigned int) time(NULL));
2048
simple_poll = avahi_simple_poll_new();
2049
if(simple_poll == NULL){
2050
fprintf_plus(stderr,
2051
"Avahi: Failed to create simple poll object.\n");
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2052
1207
exitcode = EX_UNAVAILABLE;
2053
1208
goto end;
2054
1209
}
2056
1211
sigemptyset(&sigterm_action.sa_mask);
2057
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2058
1213
if(ret == -1){
2059
perror_plus("sigaddset");
1214
perror("sigaddset");
2060
1215
exitcode = EX_OSERR;
2061
1216
goto end;
2062
1217
}
2063
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2064
1219
if(ret == -1){
2065
perror_plus("sigaddset");
1220
perror("sigaddset");
2066
1221
exitcode = EX_OSERR;
2067
1222
goto end;
2068
1223
}
2069
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2070
1225
if(ret == -1){
2071
perror_plus("sigaddset");
1226
perror("sigaddset");
2072
1227
exitcode = EX_OSERR;
2073
1228
goto end;
2074
1229
}
2078
1233
*/
2079
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2080
1235
if(ret == -1){
2081
perror_plus("sigaction");
1236
perror("sigaction");
2082
1237
return EX_OSERR;
2083
1238
}
2084
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
2085
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
2086
1241
if(ret == -1){
2087
perror_plus("sigaction");
1242
perror("sigaction");
2088
1243
exitcode = EX_OSERR;
2089
1244
goto end;
2090
1245
}
2091
1246
}
2092
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2093
1248
if(ret == -1){
2094
perror_plus("sigaction");
1249
perror("sigaction");
2095
1250
return EX_OSERR;
2096
1251
}
2097
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
2098
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2099
1254
if(ret == -1){
2100
perror_plus("sigaction");
1255
perror("sigaction");
2101
1256
exitcode = EX_OSERR;
2102
1257
goto end;
2103
1258
}
2104
1259
}
2105
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2106
1261
if(ret == -1){
2107
perror_plus("sigaction");
1262
perror("sigaction");
2108
1263
return EX_OSERR;
2109
1264
}
2110
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
2111
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2112
1267
if(ret == -1){
2113
perror_plus("sigaction");
1268
perror("sigaction");
2114
1269
exitcode = EX_OSERR;
2115
1270
goto end;
2116
1271
}
2117
1272
}
2118
1273
2119
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2122
/* Look for any good interfaces */
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2124
alphasort);
2125
if(ret >= 1){
2126
/* Add all found interfaces to interfaces list */
2127
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2129
direntries[i]->d_name);
2130
if(ret_errno != 0){
2131
perror_plus("argz_add");
2132
continue;
2133
}
2134
if(debug){
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
direntries[i]->d_name);
2137
}
2138
}
2139
free(direntries);
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
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
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
2140
1409
} else {
2141
free(direntries);
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2143
exitcode = EXIT_FAILURE;
2144
goto end;
2145
}
2146
}
2147
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2160
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2162
interface))){
2163
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2165
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2169
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2173
}
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
2174
1414
}
2175
1415
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
if(debug and (interfaces_to_take_down == NULL)){
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
}
2182
1416
}
2183
1417
2184
1418
if(quit_now){
2187
1421
2188
1422
ret = init_gnutls_global(pubkey, seckey);
2189
1423
if(ret == -1){
2190
fprintf_plus(stderr, "init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2191
1425
exitcode = EX_UNAVAILABLE;
2192
1426
goto end;
2193
1427
} else {
2198
1432
goto end;
2199
1433
}
2200
1434
1435
tempdir_created = true;
2201
1436
if(mkdtemp(tempdir) == NULL){
2202
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2203
1439
goto end;
2204
1440
}
2205
tempdir_created = true;
2206
1441
2207
1442
if(quit_now){
2208
1443
goto end;
2209
1444
}
2210
1445
2211
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
2212
fprintf_plus(stderr, "init_gpgme failed\n");
1447
fprintf(stderr, "init_gpgme failed\n");
2213
1448
exitcode = EX_UNAVAILABLE;
2214
1449
goto end;
2215
1450
} else {
2224
1459
/* Connect directly, do not use Zeroconf */
2225
1460
/* (Mainly meant for debugging) */
2226
1461
char *address = strrchr(connect_to, ':');
2227
2228
1462
if(address == NULL){
2229
fprintf_plus(stderr, "No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2230
1464
exitcode = EX_USAGE;
2231
1465
goto end;
2232
1466
}
2235
1469
goto end;
2236
1470
}
2237
1471
2238
in_port_t port;
1472
uint16_t port;
2239
1473
errno = 0;
2240
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2241
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2242
or tmpmax != (in_port_t)tmpmax){
2243
fprintf_plus(stderr, "Bad port number\n");
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2244
1478
exitcode = EX_USAGE;
2245
1479
goto end;
2246
1480
}
2249
1483
goto end;
2250
1484
}
2251
1485
2252
port = (in_port_t)tmpmax;
1486
port = (uint16_t)tmpmax;
2253
1487
*address = '\0';
1488
address = connect_to;
2254
1489
/* Colon in address indicates IPv6 */
2255
1490
int af;
2256
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2257
1492
af = AF_INET6;
2258
/* Accept [] around IPv6 address - see RFC 5952 */
2259
if(connect_to[0] == '[' and address[-1] == ']')
2260
{
2261
connect_to++;
2262
address[-1] = '\0';
2263
}
2264
1493
} else {
2265
1494
af = AF_INET;
2266
1495
}
2267
address = connect_to;
2268
1496
2269
1497
if(quit_now){
2270
1498
goto end;
2271
1499
}
2272
1500
2273
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
2275
if(quit_now or ret == 0){
2276
break;
2277
}
2278
if(debug){
2279
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
(int)retry_interval);
2281
}
2282
sleep((int)retry_interval);
2283
}
2284
2285
if (not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2286
1523
exitcode = EXIT_SUCCESS;
2287
1524
}
2288
2289
1525
goto end;
2290
1526
}
2291
1527
2303
1539
config.publish_domain = 0;
2304
1540
2305
1541
/* Allocate a new server */
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2308
1545
2309
1546
/* Free the Avahi configuration data */
2310
1547
avahi_server_config_free(&config);
2312
1549
2313
1550
/* Check if creating the Avahi server object succeeded */
2314
1551
if(mc.server == NULL){
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2317
1554
exitcode = EX_UNAVAILABLE;
2318
1555
goto end;
2319
1556
}
2327
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
1565
NULL, 0, browse_callback, NULL);
2329
1566
if(sb == NULL){
2330
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
avahi_strerror(avahi_server_errno(mc.server)));
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2332
1569
exitcode = EX_UNAVAILABLE;
2333
1570
goto end;
2334
1571
}
2340
1577
/* Run the main loop */
2341
1578
2342
1579
if(debug){
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
}
2345
2346
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2348
if(debug){
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
(ret == 0) ? "successfully" : "with error");
2351
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2352
1584
2353
1585
end:
2354
1586
2355
1587
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2357
1589
}
2358
1590
2359
1591
/* Cleanup things */
2363
1595
if(mc.server != NULL)
2364
1596
avahi_server_free(mc.server);
2365
1597
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2368
1600
2369
1601
if(gnutls_initialized){
2370
1602
gnutls_certificate_free_credentials(mc.cred);
2376
1608
gpgme_release(mc.ctx);
2377
1609
}
2378
1610
2379
/* Cleans up the circular linked list of Mandos servers the client
2380
has seen */
2381
if(mc.current_server != NULL){
2382
mc.current_server->prev->next = NULL;
2383
while(mc.current_server != NULL){
2384
server *next = mc.current_server->next;
2385
free(mc.current_server);
2386
mc.current_server = next;
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
2387
1618
}
2388
}
2389
2390
/* Re-raise priviliges */
2391
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2408
1628
}
2409
1629
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2413
1639
}
2414
1640
}
2415
2416
lower_privileges_permanently();
2417
1641
}
2418
1642
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2421
2422
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2423
1644
if(tempdir_created){
2424
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2431
1665
char *fullname = NULL;
2432
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
1667
direntry->d_name);
2434
1668
if(ret < 0){
2435
perror_plus("asprintf");
1669
perror("asprintf");
2436
1670
continue;
2437
1671
}
2438
1672
ret = remove(fullname);
2439
1673
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2442
1676
}
2443
1677
free(fullname);
2444
1678
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
1679
closedir(d);
2451
1680
}
2452
1681
ret = rmdir(tempdir);
2453
1682
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
1683
perror("rmdir");
2455
1684
}
2456
1685
}
2457
1686
2462
1691
&old_sigterm_action,
2463
1692
NULL));
2464
1693
if(ret == -1){
2465
perror_plus("sigaction");
1694
perror("sigaction");
2466
1695
}
2467
1696
do {
2468
1697
ret = raise(signal_received);
2469
1698
} while(ret != 0 and errno == EINTR);
2470
1699
if(ret != 0){
2471
perror_plus("raise");
1700
perror("raise");
2472
1701
abort();
2473
1702
}
2474
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0