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- Committer: Teddy Hogeborn
- Date: 2012-06-15 17:18:34 UTC
- Revision ID: teddy@recompile.se-20120615171834-gzzgknth003j903u
* plugins.d/mandos-client.c (main): Bug fix: Set DEVICE environment
variable correctly for network
hooks. Also, don't call
run_network_hooks() with NULL
value.
variable correctly for network
hooks. Also, don't call
run_network_hooks() with NULL
value.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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 */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
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 <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
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() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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 */
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() */
86
94
87
95
#ifdef __linux__
88
96
#include <sys/klog.h> /* klogctl() */
106
114
init_gnutls_session(),
107
115
GNUTLS_* */
108
116
#include <gnutls/openpgp.h>
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
111
119
112
120
/* GPGME */
113
121
#include <gpgme.h> /* All GPGME types, constants and
121
129
#define PATHDIR "/conf/conf.d/mandos"
122
130
#define SECKEY "seckey.txt"
123
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
133
125
134
bool debug = false;
126
135
static const char mandos_protocol_version[] = "1";
127
136
const char *argp_program_version = "mandos-client " VERSION;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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
154
130
155
/* Used for passing in values through the Avahi callback functions */
131
156
typedef struct {
136
161
gnutls_dh_params_t dh_params;
137
162
const char *priority;
138
163
gpgme_ctx_t ctx;
164
server *current_server;
139
165
} mandos_context;
140
166
141
167
/* global context so signal handler can reach it*/
142
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
169
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
145
172
146
173
sig_atomic_t quit_now = 0;
147
174
int signal_received = 0;
148
175
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
149
195
/*
150
196
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
197
* bytes. "buffer_capacity" is how much is currently allocated,
152
198
* "buffer_length" is how much is already used.
153
199
*/
154
200
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
201
size_t buffer_capacity){
156
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
204
if(buffer == NULL){
163
209
return buffer_capacity;
164
210
}
165
211
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
166
249
/*
167
250
* Initialize GPGME.
168
251
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
171
254
gpgme_error_t rc;
172
255
gpgme_engine_info_t engine_info;
173
256
182
265
183
266
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
267
if(fd == -1){
185
perror("open");
268
perror_plus("open");
186
269
return false;
187
270
}
188
271
189
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
273
if(rc != GPG_ERR_NO_ERROR){
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
275
gpgme_strsource(rc), gpgme_strerror(rc));
193
276
return false;
194
277
}
195
278
196
279
rc = gpgme_op_import(mc.ctx, pgp_data);
197
280
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
200
283
return false;
201
284
}
202
285
203
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
287
if(ret == -1){
205
perror("close");
288
perror_plus("close");
206
289
}
207
290
gpgme_data_release(pgp_data);
208
291
return true;
209
292
}
210
293
211
294
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
295
fprintf_plus(stderr, "Initializing GPGME\n");
213
296
}
214
297
215
298
/* Init GPGME */
216
299
gpgme_check_version(NULL);
217
300
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
301
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
221
304
return false;
222
305
}
223
306
224
/* Set GPGME home directory for the OpenPGP engine only */
307
/* Set GPGME home directory for the OpenPGP engine only */
225
308
rc = gpgme_get_engine_info(&engine_info);
226
309
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
310
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
229
312
return false;
230
313
}
231
314
while(engine_info != NULL){
237
320
engine_info = engine_info->next;
238
321
}
239
322
if(engine_info == NULL){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
324
tempdir);
241
325
return false;
242
326
}
243
327
244
328
/* Create new GPGME "context" */
245
329
rc = gpgme_new(&(mc.ctx));
246
330
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
249
334
return false;
250
335
}
251
336
270
355
ssize_t plaintext_length = 0;
271
356
272
357
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
358
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
359
}
275
360
276
361
/* Create new GPGME data buffer from memory cryptotext */
277
362
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
363
0);
279
364
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
282
367
return -1;
283
368
}
284
369
285
370
/* Create new empty GPGME data buffer for the plaintext */
286
371
rc = gpgme_data_new(&dh_plain);
287
372
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
290
376
gpgme_data_release(dh_crypto);
291
377
return -1;
292
378
}
295
381
data buffer */
296
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
297
383
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
300
386
plaintext_length = -1;
301
387
if(debug){
302
388
gpgme_decrypt_result_t result;
303
389
result = gpgme_op_decrypt_result(mc.ctx);
304
390
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
392
} else {
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
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);
311
397
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
399
}
314
400
gpgme_recipient_t recipient;
315
401
recipient = result->recipients;
316
402
while(recipient != NULL){
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");
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");
323
410
recipient = recipient->next;
324
411
}
325
412
}
328
415
}
329
416
330
417
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
418
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
419
}
333
420
334
421
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
422
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
423
perror_plus("gpgme_data_seek");
337
424
plaintext_length = -1;
338
425
goto decrypt_end;
339
426
}
341
428
*plaintext = NULL;
342
429
while(true){
343
430
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
431
(size_t)plaintext_length,
432
plaintext_capacity);
346
433
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
434
perror_plus("incbuffer");
435
plaintext_length = -1;
436
goto decrypt_end;
350
437
}
351
438
352
439
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
357
444
break;
358
445
}
359
446
if(ret < 0){
360
perror("gpgme_data_read");
447
perror_plus("gpgme_data_read");
361
448
plaintext_length = -1;
362
449
goto decrypt_end;
363
450
}
365
452
}
366
453
367
454
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
455
fprintf_plus(stderr, "Decrypted password is: ");
369
456
for(ssize_t i = 0; i < plaintext_length; i++){
370
457
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
458
}
383
470
}
384
471
385
472
static const char * safer_gnutls_strerror(int value){
386
const char *ret = gnutls_strerror(value); /* Spurious warning from
387
-Wunreachable-code */
473
const char *ret = gnutls_strerror(value);
388
474
if(ret == NULL)
389
475
ret = "(unknown)";
390
476
return ret;
393
479
/* GnuTLS log function callback */
394
480
static void debuggnutls(__attribute__((unused)) int level,
395
481
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
482
fprintf_plus(stderr, "GnuTLS: %s", string);
397
483
}
398
484
399
485
static int init_gnutls_global(const char *pubkeyfilename,
401
487
int ret;
402
488
403
489
if(debug){
404
fprintf(stderr, "Initializing GnuTLS\n");
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
491
}
406
492
407
493
ret = gnutls_global_init();
408
494
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
411
497
return -1;
412
498
}
413
499
420
506
}
421
507
422
508
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
510
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
safer_gnutls_strerror(ret));
430
513
gnutls_global_deinit();
431
514
return -1;
432
515
}
433
516
434
517
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
520
pubkeyfilename,
521
seckeyfilename);
438
522
}
439
523
440
524
ret = gnutls_certificate_set_openpgp_key_file
441
525
(mc.cred, pubkeyfilename, seckeyfilename,
442
526
GNUTLS_OPENPGP_FMT_BASE64);
443
527
if(ret != GNUTLS_E_SUCCESS){
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));
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));
449
533
goto globalfail;
450
534
}
451
535
452
536
/* GnuTLS server initialization */
453
537
ret = gnutls_dh_params_init(&mc.dh_params);
454
538
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
" initialization: %s\n",
541
safer_gnutls_strerror(ret));
457
542
goto globalfail;
458
543
}
459
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
545
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
463
548
goto globalfail;
464
549
}
465
550
485
570
}
486
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
572
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
490
576
}
491
577
492
578
{
499
585
}
500
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
587
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
505
591
gnutls_deinit(*session);
506
592
return -1;
507
593
}
516
602
}
517
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
604
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
521
607
gnutls_deinit(*session);
522
608
return -1;
523
609
}
535
621
__attribute__((unused)) const char *txt){}
536
622
537
623
/* Called when a Mandos server is found */
538
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
539
625
AvahiIfIndex if_index,
540
626
int af){
541
627
int ret, tcp_sd = -1;
553
639
gnutls_session_t session;
554
640
int pf; /* Protocol family */
555
641
642
errno = 0;
643
556
644
if(quit_now){
645
errno = EINTR;
557
646
return -1;
558
647
}
559
648
565
654
pf = PF_INET;
566
655
break;
567
656
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
658
errno = EINVAL;
569
659
return -1;
570
660
}
571
661
575
665
}
576
666
577
667
if(debug){
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
580
670
}
581
671
582
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
673
if(tcp_sd < 0){
584
perror("socket");
674
int e = errno;
675
perror_plus("socket");
676
errno = e;
585
677
goto mandos_end;
586
678
}
587
679
588
680
if(quit_now){
681
errno = EINTR;
589
682
goto mandos_end;
590
683
}
591
684
598
691
ret = inet_pton(af, ip, &to.in.sin_addr);
599
692
}
600
693
if(ret < 0 ){
601
perror("inet_pton");
694
int e = errno;
695
perror_plus("inet_pton");
696
errno = e;
602
697
goto mandos_end;
603
698
}
604
699
if(ret == 0){
605
fprintf(stderr, "Bad address: %s\n", ip);
700
int e = errno;
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
702
errno = e;
606
703
goto mandos_end;
607
704
}
608
705
if(af == AF_INET6){
609
to.in6.sin6_port = htons(port); /* Spurious warnings from
610
-Wconversion and
611
-Wunreachable-code */
612
706
to.in6.sin6_port = htons(port);
613
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
709
-Wunreachable-code*/
616
710
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
713
errno = EINVAL;
619
714
goto mandos_end;
620
715
}
621
716
/* Set the network interface number as scope */
628
723
}
629
724
630
725
if(quit_now){
726
errno = EINTR;
631
727
goto mandos_end;
632
728
}
633
729
635
731
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
732
char interface[IF_NAMESIZE];
637
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
734
perror_plus("if_indextoname");
639
735
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
642
738
}
643
739
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
646
742
}
647
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
655
751
sizeof(addrstr));
656
752
}
657
753
if(pcret == NULL){
658
perror("inet_ntop");
754
perror_plus("inet_ntop");
659
755
} else {
660
756
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
662
758
}
663
759
}
664
760
}
665
761
666
762
if(quit_now){
763
errno = EINTR;
667
764
goto mandos_end;
668
765
}
669
766
673
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
674
771
}
675
772
if(ret < 0){
676
perror("connect");
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
677
778
goto mandos_end;
678
779
}
679
780
680
781
if(quit_now){
782
errno = EINTR;
681
783
goto mandos_end;
682
784
}
683
785
686
788
while(true){
687
789
size_t out_size = strlen(out);
688
790
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
791
out_size - written));
690
792
if(ret == -1){
691
perror("write");
793
int e = errno;
794
perror_plus("write");
795
errno = e;
692
796
goto mandos_end;
693
797
}
694
798
written += (size_t)ret;
704
808
}
705
809
706
810
if(quit_now){
811
errno = EINTR;
707
812
goto mandos_end;
708
813
}
709
814
}
710
815
711
816
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
713
818
}
714
819
715
820
if(quit_now){
821
errno = EINTR;
716
822
goto mandos_end;
717
823
}
718
824
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
720
830
721
831
if(quit_now){
832
errno = EINTR;
722
833
goto mandos_end;
723
834
}
724
835
725
836
do {
726
837
ret = gnutls_handshake(session);
727
838
if(quit_now){
839
errno = EINTR;
728
840
goto mandos_end;
729
841
}
730
842
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
843
732
844
if(ret != GNUTLS_E_SUCCESS){
733
845
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
735
847
gnutls_perror(ret);
736
848
}
849
errno = EPROTO;
737
850
goto mandos_end;
738
851
}
739
852
740
853
/* Read OpenPGP packet that contains the wanted password */
741
854
742
855
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
745
858
}
746
859
747
860
while(true){
748
861
749
862
if(quit_now){
863
errno = EINTR;
750
864
goto mandos_end;
751
865
}
752
866
753
867
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
868
buffer_capacity);
755
869
if(buffer_capacity == 0){
756
perror("incbuffer");
870
int e = errno;
871
perror_plus("incbuffer");
872
errno = e;
757
873
goto mandos_end;
758
874
}
759
875
760
876
if(quit_now){
877
errno = EINTR;
761
878
goto mandos_end;
762
879
}
763
880
776
893
ret = gnutls_handshake(session);
777
894
778
895
if(quit_now){
896
errno = EINTR;
779
897
goto mandos_end;
780
898
}
781
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
900
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
784
903
gnutls_perror(ret);
904
errno = EPROTO;
785
905
goto mandos_end;
786
906
}
787
907
break;
788
908
default:
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
791
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
errno = EIO;
792
913
goto mandos_end;
793
914
}
794
915
} else {
797
918
}
798
919
799
920
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
921
fprintf_plus(stderr, "Closing TLS session\n");
801
922
}
802
923
803
924
if(quit_now){
925
errno = EINTR;
804
926
goto mandos_end;
805
927
}
806
928
807
929
do {
808
930
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
931
if(quit_now){
932
errno = EINTR;
810
933
goto mandos_end;
811
934
}
812
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
936
814
937
if(buffer_length > 0){
815
938
ssize_t decrypted_buffer_size;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
818
940
&decrypted_buffer);
819
941
if(decrypted_buffer_size >= 0){
820
942
821
943
written = 0;
822
944
while(written < (size_t) decrypted_buffer_size){
823
945
if(quit_now){
946
errno = EINTR;
824
947
goto mandos_end;
825
948
}
826
949
828
951
(size_t)decrypted_buffer_size - written,
829
952
stdout);
830
953
if(ret == 0 and ferror(stdout)){
954
int e = errno;
831
955
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
834
958
}
959
errno = e;
835
960
goto mandos_end;
836
961
}
837
962
written += (size_t)ret;
843
968
/* Shutdown procedure */
844
969
845
970
mandos_end:
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;
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
}
857
990
}
858
991
return retval;
859
992
}
872
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
873
1006
flags,
874
1007
AVAHI_GCC_UNUSED void* userdata){
875
assert(r);
1008
if(r == NULL){
1009
return;
1010
}
876
1011
877
1012
/* Called whenever a service has been resolved successfully or
878
1013
timed out */
884
1019
switch(event){
885
1020
default:
886
1021
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
890
1026
break;
891
1027
892
1028
case AVAHI_RESOLVER_FOUND:
894
1030
char ip[AVAHI_ADDRESS_STR_MAX];
895
1031
avahi_address_snprint(ip, sizeof(ip), address);
896
1032
if(debug){
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);
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);
900
1036
}
901
int ret = start_mandos_communication(ip, port, interface,
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
interface,
902
1039
avahi_proto_to_af(proto));
903
1040
if(ret == 0){
904
1041
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
}
905
1048
}
906
1049
}
907
1050
}
918
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
919
1062
flags,
920
1063
AVAHI_GCC_UNUSED void* userdata){
921
assert(b);
1064
if(b == NULL){
1065
return;
1066
}
922
1067
923
1068
/* Called whenever a new services becomes available on the LAN or
924
1069
is removed from the LAN */
931
1076
default:
932
1077
case AVAHI_BROWSER_FAILURE:
933
1078
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
936
1081
avahi_simple_poll_quit(mc.simple_poll);
937
1082
return;
938
1083
945
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
1091
name, type, domain, protocol, 0,
947
1092
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
950
1096
break;
951
1097
952
1098
case AVAHI_BROWSER_REMOVE:
955
1101
case AVAHI_BROWSER_ALL_FOR_NOW:
956
1102
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
1103
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
959
1106
}
960
1107
break;
961
1108
}
962
1109
}
963
1110
964
/* stop main loop after sigterm has been called */
1111
/* Signal handler that stops main loop after SIGTERM */
965
1112
static void handle_sigterm(int sig){
966
1113
if(quit_now){
967
1114
return;
969
1116
quit_now = 1;
970
1117
signal_received = sig;
971
1118
int old_errno = errno;
1119
/* set main loop to exit */
972
1120
if(mc.simple_poll != NULL){
973
1121
avahi_simple_poll_quit(mc.simple_poll);
974
1122
}
975
1123
errno = old_errno;
976
1124
}
977
1125
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
978
1750
int main(int argc, char *argv[]){
979
1751
AvahiSServiceBrowser *sb = NULL;
980
int error;
1752
error_t ret_errno;
981
1753
int ret;
982
1754
intmax_t tmpmax;
983
1755
char *tmp;
984
1756
int exitcode = EXIT_SUCCESS;
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;
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;
992
1761
char tempdir[] = "/tmp/mandosXXXXXX";
993
1762
bool tempdir_created = false;
994
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
995
1764
const char *seckey = PATHDIR "/" SECKEY;
996
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
997
1768
998
1769
bool gnutls_initialized = false;
999
1770
bool gpgme_initialized = false;
1000
1771
float delay = 2.5f;
1772
double retry_interval = 10; /* 10s between trying a server and
1773
retrying the same server again */
1001
1774
1002
1775
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1776
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1782
errno = 0;
1010
1783
ret = setgid(gid);
1011
1784
if(ret == -1){
1012
perror("setgid");
1785
perror_plus("setgid");
1013
1786
}
1014
1787
1015
1788
/* Lower user privileges (temporarily) */
1016
1789
errno = 0;
1017
1790
ret = seteuid(uid);
1018
1791
if(ret == -1){
1019
perror("seteuid");
1792
perror_plus("seteuid");
1020
1793
}
1021
1794
1022
1795
if(quit_now){
1057
1830
.arg = "SECONDS",
1058
1831
.doc = "Maximum delay to wait for interface startup",
1059
1832
.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 },
1060
1841
/*
1061
1842
* These reproduce what we would get without ARGP_NO_HELP
1062
1843
*/
1080
1861
connect_to = arg;
1081
1862
break;
1082
1863
case 'i': /* --interface */
1083
interface = arg;
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
}
1084
1869
break;
1085
1870
case 's': /* --seckey */
1086
1871
seckey = arg;
1106
1891
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
1892
argp_error(state, "Bad delay");
1108
1893
}
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;
1109
1905
break;
1110
1906
/*
1111
1907
* These reproduce what we would get without ARGP_NO_HELP
1118
1914
argp_state_help(state, state->out_stream,
1119
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
1916
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1122
1918
exit(argp_err_exit_status);
1123
1919
break;
1124
1920
default:
1139
1935
case ENOMEM:
1140
1936
default:
1141
1937
errno = ret;
1142
perror("argp_parse");
1938
perror_plus("argp_parse");
1143
1939
exitcode = EX_OSERR;
1144
1940
goto end;
1145
1941
case EINVAL:
1147
1943
goto end;
1148
1944
}
1149
1945
}
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
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2027
if(interfaces_hooks == NULL){
2028
perror_plus("malloc");
2029
goto end;
2030
}
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2040
}
1150
2041
1151
2042
if(not debug){
1152
2043
avahi_set_log_function(empty_log);
1158
2049
srand((unsigned int) time(NULL));
1159
2050
mc.simple_poll = avahi_simple_poll_new();
1160
2051
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
2052
fprintf_plus(stderr,
2053
"Avahi: Failed to create simple poll object.\n");
2054
exitcode = EX_UNAVAILABLE;
1163
2055
goto end;
1164
2056
}
1165
2057
1166
2058
sigemptyset(&sigterm_action.sa_mask);
1167
2059
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
2060
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
2061
perror_plus("sigaddset");
2062
exitcode = EX_OSERR;
1171
2063
goto end;
1172
2064
}
1173
2065
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
2066
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
2067
perror_plus("sigaddset");
2068
exitcode = EX_OSERR;
1177
2069
goto end;
1178
2070
}
1179
2071
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
2072
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
2073
perror_plus("sigaddset");
2074
exitcode = EX_OSERR;
1183
2075
goto end;
1184
2076
}
1185
2077
/* Need to check if the handler is SIG_IGN before handling:
1188
2080
*/
1189
2081
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
2082
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2083
perror_plus("sigaction");
2084
return EX_OSERR;
1193
2085
}
1194
2086
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
2087
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
2088
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2089
perror_plus("sigaction");
2090
exitcode = EX_OSERR;
1199
2091
goto end;
1200
2092
}
1201
2093
}
1202
2094
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
2095
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
2096
perror_plus("sigaction");
2097
return EX_OSERR;
1206
2098
}
1207
2099
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
2100
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
2101
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
2102
perror_plus("sigaction");
2103
exitcode = EX_OSERR;
1212
2104
goto end;
1213
2105
}
1214
2106
}
1215
2107
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
2108
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
2109
perror_plus("sigaction");
2110
return EX_OSERR;
1219
2111
}
1220
2112
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
2113
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
2114
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
2115
perror_plus("sigaction");
2116
exitcode = EX_OSERR;
1225
2117
goto end;
1226
2118
}
1227
2119
}
1228
2120
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
}
2121
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2124
/* Look for any good interfaces */
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2126
alphasort);
2127
if(ret >= 1){
2128
/* Add all found interfaces to interfaces list */
2129
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2131
direntries[i]->d_name);
2132
if(ret_errno != 0){
2133
perror_plus("argz_add");
2134
continue;
2135
}
2136
if(debug){
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
direntries[i]->d_name);
2139
}
2140
}
2141
free(direntries);
1364
2142
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
2143
free(direntries);
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2145
exitcode = EXIT_FAILURE;
2146
goto end;
2147
}
2148
}
2149
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2162
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2164
interface))){
2165
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
2167
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2171
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2175
}
1369
2176
}
1370
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
if(debug and (interfaces_to_take_down == NULL)){
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
}
1371
2184
}
1372
2185
1373
2186
if(quit_now){
1376
2189
1377
2190
ret = init_gnutls_global(pubkey, seckey);
1378
2191
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
exitcode = EX_UNAVAILABLE;
1381
2194
goto end;
1382
2195
} else {
1383
2196
gnutls_initialized = true;
1387
2200
goto end;
1388
2201
}
1389
2202
2203
if(mkdtemp(tempdir) == NULL){
2204
perror_plus("mkdtemp");
2205
goto end;
2206
}
1390
2207
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
2208
1397
2209
if(quit_now){
1398
2210
goto end;
1399
2211
}
1400
2212
1401
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2214
fprintf_plus(stderr, "init_gpgme failed\n");
2215
exitcode = EX_UNAVAILABLE;
1404
2216
goto end;
1405
2217
} else {
1406
2218
gpgme_initialized = true;
1414
2226
/* Connect directly, do not use Zeroconf */
1415
2227
/* (Mainly meant for debugging) */
1416
2228
char *address = strrchr(connect_to, ':');
2229
1417
2230
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2231
fprintf_plus(stderr, "No colon in address\n");
2232
exitcode = EX_USAGE;
1420
2233
goto end;
1421
2234
}
1422
2235
1424
2237
goto end;
1425
2238
}
1426
2239
1427
uint16_t port;
2240
in_port_t port;
1428
2241
errno = 0;
1429
2242
tmpmax = strtoimax(address+1, &tmp, 10);
1430
2243
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2244
or tmpmax != (in_port_t)tmpmax){
2245
fprintf_plus(stderr, "Bad port number\n");
2246
exitcode = EX_USAGE;
1434
2247
goto end;
1435
2248
}
1436
2249
1438
2251
goto end;
1439
2252
}
1440
2253
1441
port = (uint16_t)tmpmax;
2254
port = (in_port_t)tmpmax;
1442
2255
*address = '\0';
1443
address = connect_to;
1444
2256
/* Colon in address indicates IPv6 */
1445
2257
int af;
1446
if(strchr(address, ':') != NULL){
2258
if(strchr(connect_to, ':') != NULL){
1447
2259
af = AF_INET6;
2260
/* Accept [] around IPv6 address - see RFC 5952 */
2261
if(connect_to[0] == '[' and address[-1] == ']')
2262
{
2263
connect_to++;
2264
address[-1] = '\0';
2265
}
1448
2266
} else {
1449
2267
af = AF_INET;
1450
2268
}
2269
address = connect_to;
1451
2270
1452
2271
if(quit_now){
1453
2272
goto end;
1454
2273
}
1455
2274
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2275
while(not quit_now){
2276
ret = start_mandos_communication(address, port, if_index, af);
2277
if(quit_now or ret == 0){
2278
break;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
(int)retry_interval);
2283
}
2284
sleep((int)retry_interval);
2285
}
2286
2287
if (not quit_now){
1460
2288
exitcode = EXIT_SUCCESS;
1461
2289
}
2290
1462
2291
goto end;
1463
2292
}
1464
2293
1478
2307
/* Allocate a new server */
1479
2308
mc.server = avahi_server_new(avahi_simple_poll_get
1480
2309
(mc.simple_poll), &config, NULL,
1481
NULL, &error);
2310
NULL, &ret_errno);
1482
2311
1483
2312
/* Free the Avahi configuration data */
1484
2313
avahi_server_config_free(&config);
1486
2315
1487
2316
/* Check if creating the Avahi server object succeeded */
1488
2317
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2318
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
2320
exitcode = EX_UNAVAILABLE;
1492
2321
goto end;
1493
2322
}
1494
2323
1501
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
2331
NULL, 0, browse_callback, NULL);
1503
2332
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
avahi_strerror(avahi_server_errno(mc.server)));
2335
exitcode = EX_UNAVAILABLE;
1507
2336
goto end;
1508
2337
}
1509
2338
1514
2343
/* Run the main loop */
1515
2344
1516
2345
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
2347
}
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2351
if(debug){
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
(ret == 0) ? "successfully" : "with error");
2354
}
1521
2355
1522
2356
end:
1523
2357
1524
2358
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1526
2360
}
1527
2361
1528
2362
/* Cleanup things */
1545
2379
gpgme_release(mc.ctx);
1546
2380
}
1547
2381
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");
2382
/* Cleans up the circular linked list of Mandos servers the client
2383
has seen */
2384
if(mc.current_server != NULL){
2385
mc.current_server->prev->next = NULL;
2386
while(mc.current_server != NULL){
2387
server *next = mc.current_server->next;
2388
free(mc.current_server);
2389
mc.current_server = next;
1555
2390
}
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");
2391
}
2392
2393
/* Re-raise priviliges */
2394
{
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
1565
2411
}
1566
2412
}
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");
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
1576
2416
}
1577
2417
}
2418
2419
lower_privileges_permanently();
1578
2420
}
1579
2421
1580
/* Removes the temp directory used by GPGME */
2422
free(interfaces_to_take_down);
2423
free(interfaces_hooks);
2424
2425
/* Removes the GPGME temp directory and all files inside */
1581
2426
if(tempdir_created){
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
}
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
1602
2434
char *fullname = NULL;
1603
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
2436
direntry->d_name);
1605
2437
if(ret < 0){
1606
perror("asprintf");
2438
perror_plus("asprintf");
1607
2439
continue;
1608
2440
}
1609
2441
ret = remove(fullname);
1610
2442
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
1613
2445
}
1614
2446
free(fullname);
1615
2447
}
1616
closedir(d);
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
1617
2454
}
1618
2455
ret = rmdir(tempdir);
1619
2456
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2457
perror_plus("rmdir");
1621
2458
}
1622
2459
}
1623
2460
1628
2465
&old_sigterm_action,
1629
2466
NULL));
1630
2467
if(ret == -1){
1631
perror("sigaction");
2468
perror_plus("sigaction");
1632
2469
}
1633
2470
do {
1634
2471
ret = raise(signal_received);
1635
2472
} while(ret != 0 and errno == EINTR);
1636
2473
if(ret != 0){
1637
perror("raise");
2474
perror_plus("raise");
1638
2475
abort();
1639
2476
}
1640
2477
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0