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- Committer: Teddy Hogeborn
- Date: 2020-11-30 18:18:25 UTC
- Revision ID: teddy@recompile.se-20201130181825-55m01hog9c4yzbin
Tags: version-1.8.13-1
Version 1.8.13-1
* Makefile (version): Change to "1.8.13".
* NEWS (Version 1.8.13): Add new entry.
* debian/changelog (1.8.13-1): - '' -
* Makefile (version): Change to "1.8.13".
* NEWS (Version 1.8.13): Add new entry.
* debian/changelog (1.8.13-1): - '' -
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2020 Teddy Hogeborn
13
* Copyright © 2008-2020 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
44
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
91
99
argz_delete(), argz_append(),
92
100
argz_stringify(), argz_add(),
93
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
94
104
95
105
#ifdef __linux__
96
106
#include <sys/klog.h> /* klogctl() */
113
123
gnutls_*
114
124
init_gnutls_session(),
115
125
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
116
127
#include <gnutls/openpgp.h>
117
128
/* gnutls_certificate_set_openpgp_key_file(),
118
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
119
135
120
136
/* GPGME */
121
137
#include <gpgme.h> /* All GPGME types, constants and
129
145
#define PATHDIR "/conf/conf.d/mandos"
130
146
#define SECKEY "seckey.txt"
131
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
132
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
151
134
152
bool debug = false;
138
156
static const char sys_class_net[] = "/sys/class/net";
139
157
char *connect_to = NULL;
140
158
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
141
160
uid_t uid = 65534;
142
161
gid_t gid = 65534;
143
162
161
180
const char *priority;
162
181
gpgme_ctx_t ctx;
163
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
164
185
} mandos_context;
165
186
166
187
/* global so signal handler can reach it*/
167
188
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
171
189
172
190
sig_atomic_t quit_now = 0;
173
191
int signal_received = 0;
181
199
perror(print_text);
182
200
}
183
201
184
__attribute__((format (gnu_printf, 2, 3)))
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
203
int fprintf_plus(FILE *stream, const char *format, ...){
186
204
va_list ap;
187
205
va_start (ap, format);
188
206
189
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
208
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
210
}
193
211
194
212
/*
196
214
* bytes. "buffer_capacity" is how much is currently allocated,
197
215
* "buffer_length" is how much is already used.
198
216
*/
217
__attribute__((nonnull, warn_unused_result))
199
218
size_t incbuffer(char **buffer, size_t buffer_length,
200
219
size_t buffer_capacity){
201
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
204
227
return 0;
205
228
}
229
*buffer = new_buf;
206
230
buffer_capacity += BUFFER_SIZE;
207
231
}
208
232
return buffer_capacity;
209
233
}
210
234
211
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
212
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
238
int af, server **current_server){
214
239
int ret;
215
240
server *new_server = malloc(sizeof(server));
216
241
if(new_server == NULL){
223
248
.af = af };
224
249
if(new_server->ip == NULL){
225
250
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
226
266
return false;
227
267
}
228
268
/* Special case of first server */
229
if (mc.current_server == NULL){
269
if(*current_server == NULL){
230
270
new_server->next = new_server;
231
271
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
272
*current_server = new_server;
234
273
} else {
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
237
277
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;
278
(*current_server)->prev = new_server;
244
279
}
245
280
return true;
246
281
}
247
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
248
335
/*
249
336
* Initialize GPGME.
250
337
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
253
343
gpgme_error_t rc;
254
344
gpgme_engine_info_t engine_info;
255
345
256
346
/*
257
347
* Helper function to insert pub and seckey to the engine keyring.
258
348
*/
259
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
260
350
int ret;
261
351
int fd;
262
352
gpgme_data_t pgp_data;
267
357
return false;
268
358
}
269
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
401
}
402
ret = lower_privileges();
403
if(ret != 0){
404
errno = ret;
405
perror_plus("Failed to lower privileges");
406
}
407
} while(false);
408
270
409
rc = gpgme_data_new_from_fd(&pgp_data, fd);
271
410
if(rc != GPG_ERR_NO_ERROR){
272
411
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
274
413
return false;
275
414
}
276
415
277
rc = gpgme_op_import(mc.ctx, pgp_data);
416
rc = gpgme_op_import(mc->ctx, pgp_data);
278
417
if(rc != GPG_ERR_NO_ERROR){
279
418
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
419
gpgme_strsource(rc), gpgme_strerror(rc));
281
420
return false;
282
421
}
422
{
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
429
fprintf_plus(stderr,
430
"The total number of considered keys: %d\n",
431
import_result->considered);
432
fprintf_plus(stderr,
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
435
fprintf_plus(stderr,
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
450
fprintf_plus(stderr,
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
453
fprintf_plus(stderr,
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
456
fprintf_plus(stderr,
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
466
import_status->fpr);
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
471
}
472
fprintf_plus(stderr, "Key status:\n");
473
fprintf_plus(stderr,
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
477
fprintf_plus(stderr,
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
481
fprintf_plus(stderr,
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
485
fprintf_plus(stderr,
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
489
fprintf_plus(stderr,
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
493
}
494
return false;
495
}
496
}
283
497
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
498
ret = close(fd);
285
499
if(ret == -1){
286
500
perror_plus("close");
287
501
}
324
538
}
325
539
326
540
/* Create new GPGME "context" */
327
rc = gpgme_new(&(mc.ctx));
541
rc = gpgme_new(&(mc->ctx));
328
542
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));
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
332
545
return false;
333
546
}
334
547
343
556
* Decrypt OpenPGP data.
344
557
* Returns -1 on error
345
558
*/
559
__attribute__((nonnull, warn_unused_result))
346
560
static ssize_t pgp_packet_decrypt(const char *cryptotext,
347
561
size_t crypto_size,
348
char **plaintext){
562
char **plaintext,
563
mandos_context *mc){
349
564
gpgme_data_t dh_crypto, dh_plain;
350
565
gpgme_error_t rc;
351
566
ssize_t ret;
368
583
/* Create new empty GPGME data buffer for the plaintext */
369
584
rc = gpgme_data_new(&dh_plain);
370
585
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
373
587
gpgme_strsource(rc), gpgme_strerror(rc));
374
588
gpgme_data_release(dh_crypto);
375
589
return -1;
377
591
378
592
/* Decrypt data from the cryptotext data buffer to the plaintext
379
593
data buffer */
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
594
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
381
595
if(rc != GPG_ERR_NO_ERROR){
382
596
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
597
gpgme_strsource(rc), gpgme_strerror(rc));
384
598
plaintext_length = -1;
385
599
if(debug){
386
600
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
601
result = gpgme_op_decrypt_result(mc->ctx);
388
602
if(result == NULL){
389
603
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
390
604
} 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);
605
if(result->unsupported_algorithm != NULL) {
606
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
607
result->unsupported_algorithm);
608
}
609
fprintf_plus(stderr, "Wrong key usage: %s\n",
610
result->wrong_key_usage ? "Yes" : "No");
395
611
if(result->file_name != NULL){
396
612
fprintf_plus(stderr, "File name: %s\n", result->file_name);
397
613
}
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
401
617
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);
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
405
620
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
409
622
}
410
623
}
411
624
}
467
680
return plaintext_length;
468
681
}
469
682
470
static const char * safer_gnutls_strerror(int value){
683
__attribute__((warn_unused_result, const))
684
static const char *safe_string(const char *str){
685
if(str == NULL)
686
return "(unknown)";
687
return str;
688
}
689
690
__attribute__((warn_unused_result))
691
static const char *safer_gnutls_strerror(int value){
471
692
const char *ret = gnutls_strerror(value);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
693
return safe_string(ret);
475
694
}
476
695
477
696
/* GnuTLS log function callback */
697
__attribute__((nonnull))
478
698
static void debuggnutls(__attribute__((unused)) int level,
479
699
const char* string){
480
700
fprintf_plus(stderr, "GnuTLS: %s", string);
481
701
}
482
702
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
483
704
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename){
705
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
mandos_context *mc){
485
708
int ret;
486
709
487
710
if(debug){
488
711
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
712
}
490
713
491
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
495
return -1;
496
}
497
498
714
if(debug){
499
715
/* "Use a log level over 10 to enable all debugging options."
500
716
* - GnuTLS manual
504
720
}
505
721
506
722
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
723
ret = gnutls_certificate_allocate_credentials(&mc->cred);
508
724
if(ret != GNUTLS_E_SUCCESS){
509
725
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
726
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
512
727
return -1;
513
728
}
514
729
515
730
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
518
733
pubkeyfilename,
519
734
seckeyfilename);
520
735
}
521
736
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
741
NULL, /* pass */
742
/* key_usage */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
744
NULL, /* names */
745
0, /* names_length */
746
/* privkey_flags */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
522
750
ret = gnutls_certificate_set_openpgp_key_file
523
(mc.cred, pubkeyfilename, seckeyfilename,
751
(mc->cred, pubkeyfilename, seckeyfilename,
524
752
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
525
756
if(ret != GNUTLS_E_SUCCESS){
526
757
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
758
"Error[%d] while reading the key pair ('%s',"
528
759
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
760
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
761
safer_gnutls_strerror(ret));
532
763
}
533
764
534
765
/* GnuTLS server initialization */
535
ret = gnutls_dh_params_init(&mc.dh_params);
766
ret = gnutls_dh_params_init(&mc->dh_params);
536
767
if(ret != GNUTLS_E_SUCCESS){
537
768
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
769
" initialization: %s\n",
539
770
safer_gnutls_strerror(ret));
540
771
goto globalfail;
541
772
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
776
do {
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
778
if(dhpfile == -1){
779
perror_plus("open");
780
dhparamsfilename = NULL;
781
break;
782
}
783
size_t params_capacity = 0;
784
while(true){
785
params_capacity = incbuffer((char **)¶ms.data,
786
(size_t)params.size,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
790
free(params.data);
791
params.data = NULL;
792
dhparamsfilename = NULL;
793
break;
794
}
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
797
BUFFER_SIZE);
798
/* EOF */
799
if(bytes_read == 0){
800
break;
801
}
802
/* check bytes_read for failure */
803
if(bytes_read < 0){
804
perror_plus("read");
805
free(params.data);
806
params.data = NULL;
807
dhparamsfilename = NULL;
808
break;
809
}
810
params.size += (unsigned int)bytes_read;
811
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
818
}
819
if(dhparamsfilename == NULL){
820
break;
821
}
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
829
}
830
free(params.data);
831
} while(false);
832
}
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
839
do {
840
int secfile = open(seckeyfilename, O_RDONLY);
841
if(secfile == -1){
842
perror_plus("open");
843
break;
844
}
845
size_t buffer_capacity = 0;
846
while(true){
847
buffer_capacity = incbuffer((char **)&buffer.data,
848
(size_t)buffer.size,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
852
free(buffer.data);
853
buffer.data = NULL;
854
break;
855
}
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
858
BUFFER_SIZE);
859
/* EOF */
860
if(bytes_read == 0){
861
break;
862
}
863
/* check bytes_read for failure */
864
if(bytes_read < 0){
865
perror_plus("read");
866
free(buffer.data);
867
buffer.data = NULL;
868
break;
869
}
870
buffer.size += (unsigned int)bytes_read;
871
}
872
close(secfile);
873
} while(false);
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
877
{
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
882
" structure: %s",
883
safer_gnutls_strerror(ret));
884
free(buffer.data);
885
buffer.data = NULL;
886
} else {
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
892
privkey = NULL;
893
}
894
free(buffer.data);
895
buffer.data = NULL;
896
if(privkey != NULL){
897
/* Use private key to suggest an appropriate
898
sec_param */
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
901
if(debug){
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)));
906
}
907
}
908
}
909
}
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
913
if(debug){
914
fprintf_plus(stderr, "Falling back to security parameter"
915
" \"%s\"\n",
916
safe_string(gnutls_sec_param_get_name
917
(sec_param)));
918
}
919
}
920
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
if(uret != 0){
923
mc->dh_bits = uret;
924
if(debug){
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
928
(sec_param)),
929
mc->dh_bits);
930
}
931
} else {
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)),
936
safer_gnutls_strerror(ret));
937
goto globalfail;
938
}
939
#endif
940
} else { /* dh_bits != 0 */
941
if(debug){
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
943
mc->dh_bits);
944
}
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
950
goto globalfail;
951
}
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
953
}
954
}
550
955
551
956
return 0;
552
957
553
958
globalfail:
554
959
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
960
gnutls_certificate_free_credentials(mc->cred);
961
gnutls_dh_params_deinit(mc->dh_params);
558
962
return -1;
559
963
}
560
964
561
static int init_gnutls_session(gnutls_session_t *session){
965
__attribute__((nonnull, warn_unused_result))
966
static int init_gnutls_session(gnutls_session_t *session,
967
mandos_context *mc){
562
968
int ret;
563
969
/* GnuTLS session creation */
564
970
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
973
| GNUTLS_NO_TICKETS
974
#endif
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
977
#endif
978
));
566
979
if(quit_now){
567
980
return -1;
568
981
}
576
989
{
577
990
const char *err;
578
991
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
992
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
993
if(quit_now){
581
994
gnutls_deinit(*session);
582
995
return -1;
593
1006
594
1007
do {
595
1008
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
1009
mc->cred);
597
1010
if(quit_now){
598
1011
gnutls_deinit(*session);
599
1012
return -1;
609
1022
/* ignore client certificate if any. */
610
1023
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
1024
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
614
1025
return 0;
615
1026
}
616
1027
618
1029
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
1030
__attribute__((unused)) const char *txt){}
620
1031
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
621
1205
/* Called when a Mandos server is found */
1206
__attribute__((nonnull, warn_unused_result))
622
1207
static int start_mandos_communication(const char *ip, in_port_t port,
623
1208
AvahiIfIndex if_index,
624
int af){
1209
int af, mandos_context *mc){
625
1210
int ret, tcp_sd = -1;
626
1211
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1212
struct sockaddr_storage to;
631
1213
char *buffer = NULL;
632
1214
char *decrypted_buffer = NULL;
633
1215
size_t buffer_length = 0;
636
1218
int retval = -1;
637
1219
gnutls_session_t session;
638
1220
int pf; /* Protocol family */
1221
bool route_added = false;
639
1222
640
1223
errno = 0;
641
1224
657
1240
return -1;
658
1241
}
659
1242
660
ret = init_gnutls_session(&session);
1243
/* If the interface is specified and we have a list of interfaces */
1244
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1245
/* Check if the interface is one of the interfaces we are using */
1246
bool match = false;
1247
{
1248
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
1252
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
match = true;
1254
break;
1255
}
1256
}
1257
}
1258
if(not match){
1259
/* This interface does not match any in the list, so we don't
1260
connect to the server */
1261
if(debug){
1262
char interface[IF_NAMESIZE];
1263
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1264
perror_plus("if_indextoname");
1265
} else {
1266
fprintf_plus(stderr, "Skipping server on non-used interface"
1267
" \"%s\"\n",
1268
if_indextoname((unsigned int)if_index,
1269
interface));
1270
}
1271
}
1272
return -1;
1273
}
1274
}
1275
1276
ret = init_gnutls_session(&session, mc);
661
1277
if(ret != 0){
662
1278
return -1;
663
1279
}
667
1283
PRIuMAX "\n", ip, (uintmax_t)port);
668
1284
}
669
1285
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1287
if(tcp_sd < 0){
672
1288
int e = errno;
673
1289
perror_plus("socket");
680
1296
goto mandos_end;
681
1297
}
682
1298
683
memset(&to, 0, sizeof(to));
684
1299
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1303
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
690
1307
}
691
1308
if(ret < 0 ){
692
1309
int e = errno;
701
1318
goto mandos_end;
702
1319
}
703
1320
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1321
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1322
if(IN6_IS_ADDR_LINKLOCAL
1323
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1324
if(if_index == AVAHI_IF_UNSPEC){
709
1325
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1326
" incomplete without a network interface\n");
712
1328
goto mandos_end;
713
1329
}
714
1330
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1332
}
717
1333
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1335
}
722
1336
723
1337
if(quit_now){
740
1354
}
741
1355
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1356
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
1357
if(af == AF_INET6){
1358
ret = getnameinfo((struct sockaddr *)&to,
1359
sizeof(struct sockaddr_in6),
1360
addrstr, sizeof(addrstr), NULL, 0,
1361
NI_NUMERICHOST);
1362
} else {
1363
ret = getnameinfo((struct sockaddr *)&to,
1364
sizeof(struct sockaddr_in),
1365
addrstr, sizeof(addrstr), NULL, 0,
1366
NI_NUMERICHOST);
1367
}
1368
if(ret == EAI_SYSTEM){
1369
perror_plus("getnameinfo");
1370
} else if(ret != 0) {
1371
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1372
} else if(strcmp(addrstr, ip) != 0){
1373
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1374
}
1375
}
1376
1377
if(quit_now){
1378
errno = EINTR;
1379
goto mandos_end;
1380
}
1381
1382
while(true){
1383
if(af == AF_INET6){
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1386
} else {
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1389
}
1390
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1397
&to)->sin6_addr)))
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1408
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1412
*/
1413
if(debug){
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1415
" direct route\n");
1416
}
1417
int e = errno;
1418
route_added = add_local_route(ip, if_index);
1419
if(route_added){
1420
continue;
1421
}
1422
errno = e;
1423
}
1424
if(errno != ECONNREFUSED or debug){
1425
int e = errno;
1426
perror_plus("connect");
1427
errno = e;
1428
}
1429
goto mandos_end;
1430
}
1431
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
break;
782
1437
}
783
1438
784
1439
const char *out = mandos_protocol_version;
935
1590
if(buffer_length > 0){
936
1591
ssize_t decrypted_buffer_size;
937
1592
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer);
1593
&decrypted_buffer, mc);
939
1594
if(decrypted_buffer_size >= 0){
940
1595
1596
clearerr(stdout);
941
1597
written = 0;
942
1598
while(written < (size_t) decrypted_buffer_size){
943
1599
if(quit_now){
959
1615
}
960
1616
written += (size_t)ret;
961
1617
}
1618
ret = fflush(stdout);
1619
if(ret != 0){
1620
int e = errno;
1621
if(debug){
1622
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1623
strerror(errno));
1624
}
1625
errno = e;
1626
goto mandos_end;
1627
}
962
1628
retval = 0;
963
1629
}
964
1630
}
967
1633
968
1634
mandos_end:
969
1635
{
1636
if(route_added){
1637
if(not delete_local_route(ip, if_index)){
1638
fprintf_plus(stderr, "Failed to delete local route to %s on"
1639
" interface %d", ip, if_index);
1640
}
1641
}
970
1642
int e = errno;
971
1643
free(decrypted_buffer);
972
1644
free(buffer);
973
1645
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1646
ret = close(tcp_sd);
975
1647
}
976
1648
if(ret == -1){
977
1649
if(e == 0){
1002
1674
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1675
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1676
flags,
1005
AVAHI_GCC_UNUSED void* userdata){
1677
void *mc){
1006
1678
if(r == NULL){
1007
1679
return;
1008
1680
}
1011
1683
timed out */
1012
1684
1013
1685
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1014
1687
return;
1015
1688
}
1016
1689
1020
1693
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
1694
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
1695
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
1696
avahi_strerror(avahi_server_errno
1697
(((mandos_context*)mc)->server)));
1024
1698
break;
1025
1699
1026
1700
case AVAHI_RESOLVER_FOUND:
1034
1708
}
1035
1709
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
1710
interface,
1037
avahi_proto_to_af(proto));
1711
avahi_proto_to_af(proto),
1712
mc);
1038
1713
if(ret == 0){
1039
1714
avahi_simple_poll_quit(simple_poll);
1040
1715
} else {
1041
1716
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1717
avahi_proto_to_af(proto),
1718
&((mandos_context*)mc)->current_server)){
1043
1719
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
1720
" list\n", name);
1045
1721
}
1058
1734
const char *domain,
1059
1735
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
1736
flags,
1061
AVAHI_GCC_UNUSED void* userdata){
1737
void *mc){
1062
1738
if(b == NULL){
1063
1739
return;
1064
1740
}
1075
1751
case AVAHI_BROWSER_FAILURE:
1076
1752
1077
1753
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1754
avahi_strerror(avahi_server_errno
1755
(((mandos_context*)mc)->server)));
1079
1756
avahi_simple_poll_quit(simple_poll);
1080
1757
return;
1081
1758
1085
1762
the callback function is called the Avahi server will free the
1086
1763
resolver for us. */
1087
1764
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
name, type, domain, protocol, 0,
1090
resolve_callback, NULL) == NULL)
1765
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1766
interface, protocol, name, type,
1767
domain, protocol, 0,
1768
resolve_callback, mc) == NULL)
1091
1769
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
1770
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
1771
avahi_strerror(avahi_server_errno
1772
(((mandos_context*)mc)->server)));
1094
1773
break;
1095
1774
1096
1775
case AVAHI_BROWSER_REMOVE:
1121
1800
errno = old_errno;
1122
1801
}
1123
1802
1803
__attribute__((nonnull, warn_unused_result))
1124
1804
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
1805
int ret;
1126
error_t ret_errno;
1806
int old_errno;
1127
1807
1128
1808
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
1809
if(s < 0){
1130
ret_errno = errno;
1810
old_errno = errno;
1131
1811
perror_plus("socket");
1132
errno = ret_errno;
1812
errno = old_errno;
1133
1813
return false;
1134
1814
}
1135
strcpy(ifr->ifr_name, ifname);
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1136
1817
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
1818
if(ret == -1){
1138
1819
if(debug){
1139
ret_errno = errno;
1820
old_errno = errno;
1140
1821
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1142
1828
}
1143
1829
return false;
1144
1830
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1145
1836
return true;
1146
1837
}
1147
1838
1839
__attribute__((nonnull, warn_unused_result))
1148
1840
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1841
1150
1842
/* Reject the loopback device */
1192
1884
* corresponds to an acceptable network device.
1193
1885
* (This function is passed to scandir(3) as a filter function.)
1194
1886
*/
1887
__attribute__((nonnull, warn_unused_result))
1195
1888
int good_interface(const struct dirent *if_entry){
1196
1889
if(if_entry->d_name[0] == '.'){
1197
1890
return 0;
1215
1908
/*
1216
1909
* This function determines if a network interface is up.
1217
1910
*/
1911
__attribute__((nonnull, warn_unused_result))
1218
1912
bool interface_is_up(const char *interface){
1219
1913
struct ifreq ifr;
1220
1914
if(not get_flags(interface, &ifr)){
1231
1925
/*
1232
1926
* This function determines if a network interface is running
1233
1927
*/
1928
__attribute__((nonnull, warn_unused_result))
1234
1929
bool interface_is_running(const char *interface){
1235
1930
struct ifreq ifr;
1236
1931
if(not get_flags(interface, &ifr)){
1244
1939
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
1940
}
1246
1941
1942
__attribute__((nonnull, pure, warn_unused_result))
1247
1943
int notdotentries(const struct dirent *direntry){
1248
1944
/* Skip "." and ".." */
1249
1945
if(direntry->d_name[0] == '.'
1256
1952
}
1257
1953
1258
1954
/* Is this directory entry a runnable program? */
1955
__attribute__((nonnull, warn_unused_result))
1259
1956
int runnable_hook(const struct dirent *direntry){
1260
1957
int ret;
1261
1958
size_t sret;
1269
1966
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
1967
"abcdefghijklmnopqrstuvwxyz"
1271
1968
"0123456789"
1272
"_-");
1969
"_.-");
1273
1970
if((direntry->d_name)[sret] != '\0'){
1274
1971
/* Contains non-allowed characters */
1275
1972
if(debug){
1279
1976
return 0;
1280
1977
}
1281
1978
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);
1979
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1290
1980
if(ret == -1){
1291
1981
if(debug){
1292
1982
perror_plus("Could not stat hook");
1316
2006
return 1;
1317
2007
}
1318
2008
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2009
__attribute__((nonnull, warn_unused_result))
2010
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2011
mandos_context *mc){
1320
2012
int ret;
1321
2013
struct timespec now;
1322
2014
struct timespec waited_time;
1323
2015
intmax_t block_time;
1324
2016
1325
2017
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
2018
if(mc->current_server == NULL){
2019
if(debug){
1328
2020
fprintf_plus(stderr, "Wait until first server is found."
1329
2021
" No timeout!\n");
1330
2022
}
1331
2023
ret = avahi_simple_poll_iterate(s, -1);
1332
2024
} else {
1333
if (debug){
2025
if(debug){
1334
2026
fprintf_plus(stderr, "Check current_server if we should run"
1335
2027
" it, or wait\n");
1336
2028
}
1343
2035
/* Calculating in ms how long time between now and server
1344
2036
who we visted longest time ago. Now - last seen. */
1345
2037
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
2038
- mc->current_server->last_seen.tv_sec);
1347
2039
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
2040
- mc->current_server->last_seen.tv_nsec);
1349
2041
/* total time is 10s/10,000ms.
1350
2042
Converting to s from ms by dividing by 1,000,
1351
2043
and ns to ms by dividing by 1,000,000. */
1353
2045
- ((intmax_t)waited_time.tv_sec * 1000))
1354
2046
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
2047
1356
if (debug){
2048
if(debug){
1357
2049
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
2050
block_time);
1359
2051
}
1360
2052
1361
2053
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);
2054
ret = start_mandos_communication(mc->current_server->ip,
2055
mc->current_server->port,
2056
mc->current_server->if_index,
2057
mc->current_server->af, mc);
1366
2058
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
2059
avahi_simple_poll_quit(s);
1368
2060
return 0;
1369
2061
}
1370
2062
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
2063
&mc->current_server->last_seen);
1372
2064
if(ret == -1){
1373
2065
perror_plus("clock_gettime");
1374
2066
return -1;
1375
2067
}
1376
mc.current_server = mc.current_server->next;
2068
mc->current_server = mc->current_server->next;
1377
2069
block_time = 0; /* Call avahi to find new Mandos
1378
2070
servers, but don't block */
1379
2071
}
1381
2073
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
2074
}
1383
2075
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
2076
if(ret > 0 or errno != EINTR){
1385
2077
return (ret != 1) ? ret : 0;
1386
2078
}
1387
2079
}
1388
2080
}
1389
2081
}
1390
2082
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,
2083
__attribute__((nonnull))
2084
void run_network_hooks(const char *mode, const char *interface,
1444
2085
const float delay){
1445
struct dirent **direntries;
2086
struct dirent **direntries = NULL;
2087
if(hookdir_fd == -1){
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2089
| O_CLOEXEC);
2090
if(hookdir_fd == -1){
2091
if(errno == ENOENT){
2092
if(debug){
2093
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2094
" found\n", hookdir);
2095
}
2096
} else {
2097
perror_plus("open");
2098
}
2099
return;
2100
}
2101
}
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2103
if(devnull == -1){
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2105
return;
2106
}
2107
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
runnable_hook, alphasort);
2109
if(numhooks == -1){
2110
perror_plus("scandir");
2111
close(devnull);
2112
return;
2113
}
1446
2114
struct dirent *direntry;
1447
2115
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");
2116
for(int i = 0; i < numhooks; i++){
2117
direntry = direntries[i];
2118
if(debug){
2119
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2120
direntry->d_name);
1458
2121
}
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){
2122
pid_t hook_pid = fork();
2123
if(hook_pid == 0){
2124
/* Child */
2125
/* Raise privileges */
2126
errno = raise_privileges_permanently();
2127
if(errno != 0){
2128
perror_plus("Failed to raise privileges");
2129
_exit(EX_NOPERM);
2130
}
2131
/* Set group */
2132
errno = 0;
2133
ret = setgid(0);
2134
if(ret == -1){
2135
perror_plus("setgid");
2136
_exit(EX_NOPERM);
2137
}
2138
/* Reset supplementary groups */
2139
errno = 0;
2140
ret = setgroups(0, NULL);
2141
if(ret == -1){
2142
perror_plus("setgroups");
2143
_exit(EX_NOPERM);
2144
}
2145
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2146
if(ret == -1){
2147
perror_plus("setenv");
2148
_exit(EX_OSERR);
2149
}
2150
ret = setenv("DEVICE", interface, 1);
2151
if(ret == -1){
2152
perror_plus("setenv");
2153
_exit(EX_OSERR);
2154
}
2155
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2156
if(ret == -1){
2157
perror_plus("setenv");
2158
_exit(EX_OSERR);
2159
}
2160
ret = setenv("MODE", mode, 1);
2161
if(ret == -1){
2162
perror_plus("setenv");
2163
_exit(EX_OSERR);
2164
}
2165
char *delaystring;
2166
ret = asprintf(&delaystring, "%f", (double)delay);
2167
if(ret == -1){
1466
2168
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
}
2169
_exit(EX_OSERR);
2170
}
2171
ret = setenv("DELAY", delaystring, 1);
2172
if(ret == -1){
1525
2173
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
}
2174
perror_plus("setenv");
2175
_exit(EX_OSERR);
2176
}
2177
free(delaystring);
2178
if(connect_to != NULL){
2179
ret = setenv("CONNECT", connect_to, 1);
2180
if(ret == -1){
2181
perror_plus("setenv");
2182
_exit(EX_OSERR);
2183
}
2184
}
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2186
direntry->d_name,
2187
O_RDONLY));
2188
if(hook_fd == -1){
2189
perror_plus("openat");
2190
_exit(EXIT_FAILURE);
2191
}
2192
if(close(hookdir_fd) == -1){
2193
perror_plus("close");
2194
_exit(EXIT_FAILURE);
2195
}
2196
ret = dup2(devnull, STDIN_FILENO);
2197
if(ret == -1){
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
_exit(EX_OSERR);
2200
}
2201
ret = close(devnull);
2202
if(ret == -1){
2203
perror_plus("close");
2204
_exit(EX_OSERR);
2205
}
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2207
if(ret == -1){
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2209
_exit(EX_OSERR);
2210
}
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2212
environ) == -1){
2213
perror_plus("fexecve");
2214
_exit(EXIT_FAILURE);
2215
}
2216
} else {
2217
if(hook_pid == -1){
2218
perror_plus("fork");
2219
free(direntry);
2220
continue;
2221
}
2222
int status;
2223
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2224
perror_plus("waitpid");
2225
free(direntry);
2226
continue;
2227
}
2228
if(WIFEXITED(status)){
2229
if(WEXITSTATUS(status) != 0){
2230
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2231
" with status %d\n", direntry->d_name,
2232
WEXITSTATUS(status));
2233
free(direntry);
2234
continue;
2235
}
2236
} else if(WIFSIGNALED(status)){
2237
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2238
" signal %d\n", direntry->d_name,
2239
WTERMSIG(status));
2240
free(direntry);
2241
continue;
1537
2242
} 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;
2243
fprintf_plus(stderr, "Warning: network hook \"%s\""
2244
" crashed\n", direntry->d_name);
2245
free(direntry);
2246
continue;
2247
}
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2251
direntry->d_name);
2252
}
2253
free(direntry);
2254
}
2255
free(direntries);
2256
if(close(hookdir_fd) == -1){
2257
perror_plus("close");
2258
} else {
2259
hookdir_fd = -1;
2260
}
2261
close(devnull);
1574
2262
}
1575
2263
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;
2264
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
2268
int ret;
1582
2269
struct ifreq network;
1583
2270
unsigned int if_index = if_nametoindex(interface);
1584
2271
if(if_index == 0){
1593
2280
}
1594
2281
1595
2282
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
2285
if(not get_flags(interface, &network)){
1597
2286
ret_errno = errno;
1598
2287
fprintf_plus(stderr, "Failed to get flags for interface "
1599
2288
"\"%s\"\n", interface);
2289
errno = old_errno;
1600
2290
return ret_errno;
1601
2291
}
1602
network.ifr_flags |= IFF_UP;
2292
network.ifr_flags |= IFF_UP; /* set flag */
1603
2293
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
2294
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2295
if(sd == -1){
1606
2296
ret_errno = errno;
1607
2297
perror_plus("socket");
1608
2298
errno = old_errno;
1609
2299
return ret_errno;
1610
2300
}
1611
2301
1612
2302
if(quit_now){
1613
close(sd);
2303
ret = close(sd);
2304
if(ret == -1){
2305
perror_plus("close");
2306
}
1614
2307
errno = old_errno;
1615
2308
return EINTR;
1616
2309
}
1620
2313
interface);
1621
2314
}
1622
2315
1623
/* Raise priviliges */
1624
raise_privileges();
2316
/* Raise privileges */
2317
ret_errno = raise_privileges();
2318
if(ret_errno != 0){
2319
errno = ret_errno;
2320
perror_plus("Failed to raise privileges");
2321
}
1625
2322
1626
2323
#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");
2324
int ret_linux;
2325
bool restore_loglevel = false;
2326
if(ret_errno == 0){
2327
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2328
messages about the network interface to mess up the prompt */
2329
ret_linux = klogctl(8, NULL, 5);
2330
if(ret_linux == -1){
2331
perror_plus("klogctl");
2332
} else {
2333
restore_loglevel = true;
2334
}
1634
2335
}
1635
2336
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
2337
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2338
ioctl_errno = errno;
1638
2339
#ifdef __linux__
1639
2340
if(restore_loglevel){
1640
2341
ret_linux = klogctl(7, NULL, 0);
1644
2345
}
1645
2346
#endif /* __linux__ */
1646
2347
1647
/* Lower privileges */
1648
lower_privileges();
2348
/* If raise_privileges() succeeded above */
2349
if(ret_errno == 0){
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2352
if(ret_errno != 0){
2353
errno = ret_errno;
2354
perror_plus("Failed to lower privileges");
2355
}
2356
}
1649
2357
1650
2358
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2359
ret = close(sd);
1652
2360
if(ret == -1){
1653
2361
perror_plus("close");
1654
2362
}
1655
2363
1656
2364
if(ret_setflags == -1){
1657
errno = ret_errno;
2365
errno = ioctl_errno;
1658
2366
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
2367
errno = old_errno;
1660
return ret_errno;
2368
return ioctl_errno;
1661
2369
}
1662
2370
} else if(debug){
1663
2371
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1666
2374
1667
2375
/* Sleep checking until interface is running.
1668
2376
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
2377
for(int i = 0; i < delay * 4; i++){
1670
2378
if(interface_is_running(interface)){
1671
2379
break;
1672
2380
}
1681
2389
return 0;
1682
2390
}
1683
2391
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;
2392
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
1689
2395
struct ifreq network;
1690
2396
unsigned int if_index = if_nametoindex(interface);
1691
2397
if(if_index == 0){
1694
2400
return ENXIO;
1695
2401
}
1696
2402
if(interface_is_up(interface)){
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
1697
2405
if(not get_flags(interface, &network) and debug){
1698
2406
ret_errno = errno;
1699
2407
fprintf_plus(stderr, "Failed to get flags for interface "
1700
2408
"\"%s\"\n", interface);
2409
errno = old_errno;
1701
2410
return ret_errno;
1702
2411
}
1703
2412
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
2413
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
2414
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2415
if(sd == -1){
1707
2416
ret_errno = errno;
1708
2417
perror_plus("socket");
1709
2418
errno = old_errno;
1715
2424
interface);
1716
2425
}
1717
2426
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();
2427
/* Raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
}
2433
2434
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2435
ioctl_errno = errno;
2436
2437
/* If raise_privileges() succeeded above */
2438
if(ret_errno == 0){
2439
/* Lower privileges */
2440
ret_errno = lower_privileges();
2441
if(ret_errno != 0){
2442
errno = ret_errno;
2443
perror_plus("Failed to lower privileges");
2444
}
2445
}
1726
2446
1727
2447
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2448
int ret = close(sd);
1729
2449
if(ret == -1){
1730
2450
perror_plus("close");
1731
2451
}
1732
2452
1733
2453
if(ret_setflags == -1){
1734
errno = ret_errno;
2454
errno = ioctl_errno;
1735
2455
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
2456
errno = old_errno;
1737
return ret_errno;
2457
return ioctl_errno;
1738
2458
}
1739
2459
} else if(debug){
1740
2460
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1746
2466
}
1747
2467
1748
2468
int main(int argc, char *argv[]){
2469
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2473
":%PROFILE_ULTRA",
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
#else
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
#endif
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
1749
2482
AvahiSServiceBrowser *sb = NULL;
1750
2483
error_t ret_errno;
1751
2484
int ret;
1752
2485
intmax_t tmpmax;
1753
2486
char *tmp;
1754
2487
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
2488
char *interfaces_to_take_down = NULL;
1758
2489
size_t interfaces_to_take_down_size = 0;
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1760
bool tempdir_created = false;
2490
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2491
char old_tempdir[] = "/tmp/mandosXXXXXX";
2492
char *tempdir = NULL;
1761
2493
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
2494
const char *seckey = PATHDIR "/" SECKEY;
1763
2495
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2499
#endif
2500
const char *dh_params_file = NULL;
1764
2501
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
2502
1767
2503
bool gnutls_initialized = false;
1768
2504
bool gpgme_initialized = false;
1814
2550
{ .name = "pubkey", .key = 'p',
1815
2551
.arg = "FILE",
1816
2552
.doc = "OpenPGP public key file base name",
1817
.group = 2 },
2553
.group = 1 },
2554
{ .name = "tls-privkey", .key = 't',
2555
.arg = "FILE",
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2558
#else
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2560
#endif
2561
.group = 1 },
2562
{ .name = "tls-pubkey", .key = 'T',
2563
.arg = "FILE",
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2566
#else
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2568
#endif
2569
.group = 1 },
1818
2570
{ .name = "dh-bits", .key = 129,
1819
2571
.arg = "BITS",
1820
2572
.doc = "Bit length of the prime number used in the"
1821
2573
" Diffie-Hellman key exchange",
1822
2574
.group = 2 },
2575
{ .name = "dh-params", .key = 134,
2576
.arg = "FILE",
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2579
.group = 2 },
1823
2580
{ .name = "priority", .key = 130,
1824
2581
.arg = "STRING",
1825
2582
.doc = "GnuTLS priority string for the TLS handshake",
1859
2616
connect_to = arg;
1860
2617
break;
1861
2618
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
2619
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2620
arg, (int)',');
1864
2621
if(ret_errno != 0){
1865
2622
argp_error(state, "%s", strerror(ret_errno));
1866
2623
}
1871
2628
case 'p': /* --pubkey */
1872
2629
pubkey = arg;
1873
2630
break;
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2633
tls_privkey = arg;
2634
#endif
2635
break;
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2638
tls_pubkey = arg;
2639
#endif
2640
break;
1874
2641
case 129: /* --dh-bits */
1875
2642
errno = 0;
1876
2643
tmpmax = strtoimax(arg, &tmp, 10);
1880
2647
}
1881
2648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1882
2649
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
1883
2653
case 130: /* --priority */
1884
2654
mc.priority = arg;
1885
2655
break;
1908
2678
argp_state_help(state, state->out_stream,
1909
2679
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1910
2680
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
1911
2682
case -3: /* --usage */
1912
2683
argp_state_help(state, state->out_stream,
1913
2684
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
1914
2686
case 'V': /* --version */
1915
2687
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1916
2688
exit(argp_err_exit_status);
1925
2697
.args_doc = "",
1926
2698
.doc = "Mandos client -- Get and decrypt"
1927
2699
" passwords from a Mandos server" };
1928
ret = argp_parse(&argp, argc, argv,
1929
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1930
switch(ret){
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
1931
2703
case 0:
1932
2704
break;
1933
2705
case ENOMEM:
1934
2706
default:
1935
errno = ret;
2707
errno = ret_errno;
1936
2708
perror_plus("argp_parse");
1937
2709
exitcode = EX_OSERR;
1938
2710
goto end;
1941
2713
goto end;
1942
2714
}
1943
2715
}
1944
2716
1945
2717
{
1946
2718
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
2719
<https://bugs.debian.org/633582> */
1948
2720
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
2721
/* Re-raise privileges */
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2725
perror_plus("Failed to raise privileges");
2726
} else {
1951
2727
struct stat st;
1952
2728
1953
2729
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1967
2743
}
1968
2744
}
1969
2745
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
2746
close(seckey_fd);
1971
2747
}
1972
2748
}
1973
2749
1974
2750
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
2751
int pubkey_fd = open(pubkey, O_RDONLY);
1976
2752
if(pubkey_fd == -1){
1988
2764
}
1989
2765
}
1990
2766
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
2767
close(pubkey_fd);
2768
}
2769
}
2770
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2776
} else {
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2778
if(ret == -1){
2779
perror_plus("fstat");
2780
} else {
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2784
if(ret == -1){
2785
perror_plus("fchown");
2786
}
2787
}
2788
}
2789
close(dhparams_fd);
2790
}
2791
}
2792
1995
2793
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2797
perror_plus("Failed to lower privileges");
2000
2798
}
2001
2799
}
2002
2800
}
2003
2801
2004
/* Remove empty interface names */
2802
/* Remove invalid interface names (except "none") */
2005
2803
{
2006
2804
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2805
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2008
2806
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2807
if(strcmp(interface, "none") != 0
2808
and if_nametoindex(interface) == 0){
2809
if(interface[0] != '\0'){
2011
2810
fprintf_plus(stderr, "Not using nonexisting interface"
2012
2811
" \"%s\"\n", interface);
2013
2812
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2813
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2015
2814
interface = NULL;
2016
2815
}
2017
2816
}
2019
2818
2020
2819
/* Run network hooks */
2021
2820
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2821
if(mc.interfaces != NULL){
2822
interfaces_hooks = malloc(mc.interfaces_size);
2025
2823
if(interfaces_hooks == NULL){
2026
2824
perror_plus("malloc");
2027
2825
goto end;
2028
2826
}
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
}
2827
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2828
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2829
}
2830
run_network_hooks("start", interfaces_hooks != NULL ?
2831
interfaces_hooks : "", delay);
2038
2832
}
2039
2833
2040
2834
if(not debug){
2117
2911
}
2118
2912
2119
2913
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2914
if(mc.interfaces == NULL){
2915
struct dirent **direntries = NULL;
2122
2916
/* Look for any good interfaces */
2123
2917
ret = scandir(sys_class_net, &direntries, good_interface,
2124
2918
alphasort);
2125
2919
if(ret >= 1){
2126
2920
/* Add all found interfaces to interfaces list */
2127
2921
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2922
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2129
2923
direntries[i]->d_name);
2130
2924
if(ret_errno != 0){
2925
errno = ret_errno;
2131
2926
perror_plus("argz_add");
2927
free(direntries[i]);
2132
2928
continue;
2133
2929
}
2134
2930
if(debug){
2135
2931
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
2932
direntries[i]->d_name);
2137
2933
}
2934
free(direntries[i]);
2138
2935
}
2139
2936
free(direntries);
2140
2937
} else {
2141
free(direntries);
2938
if(ret == 0){
2939
free(direntries);
2940
}
2142
2941
fprintf_plus(stderr, "Could not find a network interface\n");
2143
2942
exitcode = EXIT_FAILURE;
2144
2943
goto end;
2145
2944
}
2146
2945
}
2147
2946
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)){
2947
/* Bring up interfaces which are down, and remove any "none"s */
2948
{
2160
2949
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2950
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2162
2951
interface))){
2952
/* If interface name is "none", stop bringing up interfaces.
2953
Also remove all instances of "none" from the list */
2954
if(strcmp(interface, "none") == 0){
2955
argz_delete(&mc.interfaces, &mc.interfaces_size,
2956
interface);
2957
interface = NULL;
2958
while((interface = argz_next(mc.interfaces,
2959
mc.interfaces_size, interface))){
2960
if(strcmp(interface, "none") == 0){
2961
argz_delete(&mc.interfaces, &mc.interfaces_size,
2962
interface);
2963
interface = NULL;
2964
}
2965
}
2966
break;
2967
}
2163
2968
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2969
errno = bring_up_interface(interface, delay);
2165
2970
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2971
if(errno != 0){
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2169
2974
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2975
errno = argz_add(&interfaces_to_take_down,
2976
&interfaces_to_take_down_size,
2977
interface);
2978
if(errno != 0){
2979
perror_plus("argz_add");
2980
}
2173
2981
}
2174
2982
}
2175
2983
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
2984
if(debug and (interfaces_to_take_down == NULL)){
2180
2985
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
2986
}
2182
2987
}
2183
2988
2989
/* If we only got one interface, explicitly use only that one */
2990
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2991
if(debug){
2992
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2993
mc.interfaces);
2994
}
2995
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2996
}
2997
2184
2998
if(quit_now){
2185
2999
goto end;
2186
3000
}
2187
3001
2188
ret = init_gnutls_global(pubkey, seckey);
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3006
#else
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3008
#endif
2189
3009
if(ret == -1){
2190
3010
fprintf_plus(stderr, "init_gnutls_global failed\n");
2191
3011
exitcode = EX_UNAVAILABLE;
2198
3018
goto end;
2199
3019
}
2200
3020
2201
if(mkdtemp(tempdir) == NULL){
3021
/* Try /run/tmp before /tmp */
3022
tempdir = mkdtemp(run_tempdir);
3023
if(tempdir == NULL and errno == ENOENT){
3024
if(debug){
3025
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3026
run_tempdir, old_tempdir);
3027
}
3028
tempdir = mkdtemp(old_tempdir);
3029
}
3030
if(tempdir == NULL){
2202
3031
perror_plus("mkdtemp");
2203
3032
goto end;
2204
3033
}
2205
tempdir_created = true;
2206
3034
2207
3035
if(quit_now){
2208
3036
goto end;
2209
3037
}
2210
3038
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
3039
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2212
3040
fprintf_plus(stderr, "init_gpgme failed\n");
2213
3041
exitcode = EX_UNAVAILABLE;
2214
3042
goto end;
2244
3072
exitcode = EX_USAGE;
2245
3073
goto end;
2246
3074
}
2247
3075
2248
3076
if(quit_now){
2249
3077
goto end;
2250
3078
}
2271
3099
}
2272
3100
2273
3101
while(not quit_now){
2274
ret = start_mandos_communication(address, port, if_index, af);
3102
ret = start_mandos_communication(address, port, if_index, af,
3103
&mc);
2275
3104
if(quit_now or ret == 0){
2276
3105
break;
2277
3106
}
2279
3108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
3109
(int)retry_interval);
2281
3110
}
2282
sleep((int)retry_interval);
3111
sleep((unsigned int)retry_interval);
2283
3112
}
2284
3113
2285
if (not quit_now){
3114
if(not quit_now){
2286
3115
exitcode = EXIT_SUCCESS;
2287
3116
}
2288
3117
2304
3133
2305
3134
/* Allocate a new server */
2306
3135
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
3136
&config, NULL, NULL, &ret);
2308
3137
2309
3138
/* Free the Avahi configuration data */
2310
3139
avahi_server_config_free(&config);
2313
3142
/* Check if creating the Avahi server object succeeded */
2314
3143
if(mc.server == NULL){
2315
3144
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
3145
avahi_strerror(ret));
2317
3146
exitcode = EX_UNAVAILABLE;
2318
3147
goto end;
2319
3148
}
2325
3154
/* Create the Avahi service browser */
2326
3155
sb = avahi_s_service_browser_new(mc.server, if_index,
2327
3156
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
NULL, 0, browse_callback, NULL);
3157
NULL, 0, browse_callback,
3158
(void *)&mc);
2329
3159
if(sb == NULL){
2330
3160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
3161
avahi_strerror(avahi_server_errno(mc.server)));
2342
3172
if(debug){
2343
3173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
3174
}
2345
3175
2346
3176
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
3177
(int)(retry_interval * 1000), &mc);
2348
3178
if(debug){
2349
3179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
3180
(ret == 0) ? "successfully" : "with error");
2353
3183
end:
2354
3184
2355
3185
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3190
} else {
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3192
}
2357
3193
}
2358
3194
2359
3195
/* Cleanup things */
3196
free(mc.interfaces);
3197
2360
3198
if(sb != NULL)
2361
3199
avahi_s_service_browser_free(sb);
2362
3200
2368
3206
2369
3207
if(gnutls_initialized){
2370
3208
gnutls_certificate_free_credentials(mc.cred);
2371
gnutls_global_deinit();
2372
3209
gnutls_dh_params_deinit(mc.dh_params);
2373
3210
}
2374
3211
2382
3219
mc.current_server->prev->next = NULL;
2383
3220
while(mc.current_server != NULL){
2384
3221
server *next = mc.current_server->next;
3222
#ifdef __GNUC__
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3225
#endif
3226
free((char *)(mc.current_server->ip));
3227
#ifdef __GNUC__
3228
#pragma GCC diagnostic pop
3229
#endif
2385
3230
free(mc.current_server);
2386
3231
mc.current_server = next;
2387
3232
}
2388
3233
}
2389
3234
2390
/* Re-raise priviliges */
3235
/* Re-raise privileges */
2391
3236
{
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");
2408
}
2409
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2413
}
2414
}
2415
2416
lower_privileges_permanently();
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
3240
perror_plus("Failed to raise privileges");
3241
} else {
3242
3243
/* Run network hooks */
3244
run_network_hooks("stop", interfaces_hooks != NULL ?
3245
interfaces_hooks : "", delay);
3246
3247
/* Take down the network interfaces which were brought up */
3248
{
3249
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3252
interface))){
3253
ret = take_down_interface(interface);
3254
if(ret != 0){
3255
errno = ret;
3256
perror_plus("Failed to take down interface");
3257
}
3258
}
3259
if(debug and (interfaces_to_take_down == NULL)){
3260
fprintf_plus(stderr, "No interfaces needed to be taken"
3261
" down\n");
3262
}
3263
}
3264
}
3265
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
3269
perror_plus("Failed to lower privileges permanently");
3270
}
2417
3271
}
2418
3272
2419
3273
free(interfaces_to_take_down);
2420
3274
free(interfaces_hooks);
2421
3275
3276
void clean_dir_at(int base, const char * const dirname,
3277
uintmax_t level){
3278
struct dirent **direntries = NULL;
3279
int dret;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3281
O_RDONLY
3282
| O_NOFOLLOW
3283
| O_DIRECTORY
3284
| O_PATH));
3285
if(dir_fd == -1){
3286
perror_plus("open");
3287
return;
3288
}
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
3292
for(int i = 0; i < numentries; i++){
3293
if(debug){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3296
}
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3298
if(dret == -1){
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3301
AT_REMOVEDIR);
3302
}
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3308
dret = 0;
3309
}
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3313
}
3314
}
3315
free(direntries[i]);
3316
}
3317
3318
/* need to clean even if 0 because man page doesn't specify */
3319
free(direntries);
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3323
}
3324
} else {
3325
perror_plus("scandirat");
3326
}
3327
close(dir_fd);
3328
}
3329
2422
3330
/* Removes the GPGME temp directory and all files inside */
2423
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];
2431
char *fullname = NULL;
2432
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
direntry->d_name);
2434
if(ret < 0){
2435
perror_plus("asprintf");
2436
continue;
2437
}
2438
ret = remove(fullname);
2439
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
2442
}
2443
free(fullname);
2444
}
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");
2451
}
2452
ret = rmdir(tempdir);
2453
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
2455
}
3331
if(tempdir != NULL){
3332
clean_dir_at(-1, tempdir, 0);
2456
3333
}
2457
3334
2458
3335
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0