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- Committer: Teddy Hogeborn
- Date: 2014-03-10 06:34:36 UTC
- Revision ID: teddy@recompile.se-20140310063436-zksdghqvv6k1pbyg
Do not add a new server to server list if clock_gettime() fails
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
* plugins.d/mandos-client.c (add_server): Set server.last_seen before
adding new server, in case
clock_gettime() fails.
- files added:
- debian/upstream-signing-key.pgp
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- 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 © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 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
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
58
inet_pton(), connect(),
61
59
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
#include <fcntl.h> /* open() */
63
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
*/
65
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
64
strtoimax() */
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
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
76
setgid(), pause(), _exit() */
84
77
#include <arpa/inet.h> /* inet_pton(), htons() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
123
116
gnutls_*
124
117
init_gnutls_session(),
125
118
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
119
#include <gnutls/openpgp.h>
128
120
/* gnutls_certificate_set_openpgp_key_file(),
129
121
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
135
122
136
123
/* GPGME */
137
124
#include <gpgme.h> /* All GPGME types, constants and
145
132
#define PATHDIR "/conf/conf.d/mandos"
146
133
#define SECKEY "seckey.txt"
147
134
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
136
152
137
bool debug = false;
156
141
static const char sys_class_net[] = "/sys/class/net";
157
142
char *connect_to = NULL;
158
143
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
144
uid_t uid = 65534;
161
145
gid_t gid = 65534;
162
146
199
183
perror(print_text);
200
184
}
201
185
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
__attribute__((format (gnu_printf, 2, 3)))
203
187
int fprintf_plus(FILE *stream, const char *format, ...){
204
188
va_list ap;
205
189
va_start (ap, format);
214
198
* bytes. "buffer_capacity" is how much is currently allocated,
215
199
* "buffer_length" is how much is already used.
216
200
*/
217
__attribute__((nonnull, warn_unused_result))
218
201
size_t incbuffer(char **buffer, size_t buffer_length,
219
202
size_t buffer_capacity){
220
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
233
216
}
234
217
235
218
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
220
int af, server **current_server){
239
221
int ret;
248
230
.af = af };
249
231
if(new_server->ip == NULL){
250
232
perror_plus("strdup");
251
free(new_server);
252
233
return false;
253
234
}
254
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
236
if(ret == -1){
256
237
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);
266
238
return false;
267
239
}
268
240
/* Special case of first server */
270
242
new_server->next = new_server;
271
243
new_server->prev = new_server;
272
244
*current_server = new_server;
245
/* Place the new server last in the list */
273
246
} else {
274
/* Place the new server last in the list */
275
247
new_server->next = *current_server;
276
248
new_server->prev = (*current_server)->prev;
277
249
new_server->prev->next = new_server;
280
252
return true;
281
253
}
282
254
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
335
255
/*
336
256
* Initialize GPGME.
337
257
*/
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){
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
343
260
gpgme_error_t rc;
344
261
gpgme_engine_info_t engine_info;
345
262
346
263
/*
347
264
* Helper function to insert pub and seckey to the engine keyring.
348
265
*/
349
bool import_key(const char * const filename){
266
bool import_key(const char *filename){
350
267
int ret;
351
268
int fd;
352
269
gpgme_data_t pgp_data;
357
274
return false;
358
275
}
359
276
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
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
410
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
278
if(rc != GPG_ERR_NO_ERROR){
412
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
420
287
gpgme_strsource(rc), gpgme_strerror(rc));
421
288
return false;
422
289
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
498
290
499
ret = close(fd);
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
292
if(ret == -1){
501
293
perror_plus("close");
502
294
}
541
333
/* Create new GPGME "context" */
542
334
rc = gpgme_new(&(mc->ctx));
543
335
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
338
gpgme_strerror(rc));
546
339
return false;
547
340
}
548
341
557
350
* Decrypt OpenPGP data.
558
351
* Returns -1 on error
559
352
*/
560
__attribute__((nonnull, warn_unused_result))
561
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
562
354
size_t crypto_size,
563
355
char **plaintext,
584
376
/* Create new empty GPGME data buffer for the plaintext */
585
377
rc = gpgme_data_new(&dh_plain);
586
378
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
588
381
gpgme_strsource(rc), gpgme_strerror(rc));
589
382
gpgme_data_release(dh_crypto);
590
383
return -1;
603
396
if(result == NULL){
604
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
398
} else {
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
612
403
if(result->file_name != NULL){
613
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
405
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
406
gpgme_recipient_t recipient;
407
recipient = result->recipients;
408
while(recipient != NULL){
618
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
413
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
414
recipient->status == GPG_ERR_NO_SECKEY
415
? "No" : "Yes");
416
recipient = recipient->next;
623
417
}
624
418
}
625
419
}
681
475
return plaintext_length;
682
476
}
683
477
684
__attribute__((warn_unused_result, const))
685
static const char *safe_string(const char *str){
686
if(str == NULL)
687
return "(unknown)";
688
return str;
689
}
690
691
__attribute__((warn_unused_result))
692
static const char *safer_gnutls_strerror(int value){
478
static const char * safer_gnutls_strerror(int value){
693
479
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
480
if(ret == NULL)
481
ret = "(unknown)";
482
return ret;
695
483
}
696
484
697
485
/* GnuTLS log function callback */
698
__attribute__((nonnull))
699
486
static void debuggnutls(__attribute__((unused)) int level,
700
487
const char* string){
701
488
fprintf_plus(stderr, "GnuTLS: %s", string);
702
489
}
703
490
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
705
491
static int init_gnutls_global(const char *pubkeyfilename,
706
492
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
493
mandos_context *mc){
709
494
int ret;
710
495
712
497
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
498
}
714
499
500
ret = gnutls_global_init();
501
if(ret != GNUTLS_E_SUCCESS){
502
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
503
safer_gnutls_strerror(ret));
504
return -1;
505
}
506
715
507
if(debug){
716
508
/* "Use a log level over 10 to enable all debugging options."
717
509
* - GnuTLS manual
725
517
if(ret != GNUTLS_E_SUCCESS){
726
518
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
519
safer_gnutls_strerror(ret));
520
gnutls_global_deinit();
728
521
return -1;
729
522
}
730
523
731
524
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
525
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
526
" secret key %s as GnuTLS credentials\n",
734
527
pubkeyfilename,
735
528
seckeyfilename);
736
529
}
737
530
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
751
531
ret = gnutls_certificate_set_openpgp_key_file
752
532
(mc->cred, pubkeyfilename, seckeyfilename,
753
533
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
534
if(ret != GNUTLS_E_SUCCESS){
758
535
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
536
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
537
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
538
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
539
safer_gnutls_strerror(ret));
771
548
safer_gnutls_strerror(ret));
772
549
goto globalfail;
773
550
}
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
785
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
794
break;
795
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
798
BUFFER_SIZE);
799
/* EOF */
800
if(bytes_read == 0){
801
break;
802
}
803
/* check bytes_read for failure */
804
if(bytes_read < 0){
805
perror_plus("read");
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
884
safer_gnutls_strerror(ret));
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
909
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
919
}
920
}
921
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
925
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
931
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
954
}
955
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
552
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
safer_gnutls_strerror(ret));
555
goto globalfail;
556
}
557
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
956
559
957
560
return 0;
958
561
959
562
globalfail:
960
563
961
564
gnutls_certificate_free_credentials(mc->cred);
565
gnutls_global_deinit();
962
566
gnutls_dh_params_deinit(mc->dh_params);
963
567
return -1;
964
568
}
965
569
966
__attribute__((nonnull, warn_unused_result))
967
570
static int init_gnutls_session(gnutls_session_t *session,
968
571
mandos_context *mc){
969
572
int ret;
970
573
/* GnuTLS session creation */
971
574
do {
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
575
ret = gnutls_init(session, GNUTLS_SERVER);
980
576
if(quit_now){
981
577
return -1;
982
578
}
1023
619
/* ignore client certificate if any. */
1024
620
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
621
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
623
1026
624
return 0;
1027
625
}
1028
626
1030
628
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
629
__attribute__((unused)) const char *txt){}
1032
630
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
close(devnull);
1078
_exit(EX_NOPERM);
1079
}
1080
/* Reset supplementary groups */
1081
errno = 0;
1082
ret = setgroups(0, NULL);
1083
if(ret == -1){
1084
perror_plus("setgroups");
1085
close(devnull);
1086
_exit(EX_NOPERM);
1087
}
1088
}
1089
ret = dup2(devnull, STDIN_FILENO);
1090
if(ret == -1){
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1092
close(devnull);
1093
_exit(EX_OSERR);
1094
}
1095
ret = close(devnull);
1096
if(ret == -1){
1097
perror_plus("close");
1098
}
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1100
if(ret == -1){
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1102
_exit(EX_OSERR);
1103
}
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1105
O_RDONLY
1106
| O_DIRECTORY
1107
| O_PATH
1108
| O_CLOEXEC));
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1112
}
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1114
helper, O_RDONLY));
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1119
}
1120
close(helperdir_fd);
1121
#ifdef __GNUC__
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1124
#endif
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1128
environ) == -1){
1129
#ifdef __GNUC__
1130
#pragma GCC diagnostic pop
1131
#endif
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1134
}
1135
}
1136
if(pid == -1){
1137
perror_plus("fork");
1138
close(devnull);
1139
return false;
1140
}
1141
ret = close(devnull);
1142
if(ret == -1){
1143
perror_plus("close");
1144
}
1145
int status;
1146
pid_t pret = -1;
1147
errno = 0;
1148
do {
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1156
}
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1159
}
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1162
" helper program");
1163
}
1164
return false;
1165
}
1166
} while(pret == -1 and errno == EINTR);
1167
if(pret == -1){
1168
perror_plus("waitpid");
1169
return false;
1170
}
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1175
return false;
1176
}
1177
return true;
1178
}
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1182
return false;
1183
}
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1185
return false;
1186
}
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1191
if(debug){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1193
}
1194
return add_delete_local_route(true, address, if_index);
1195
}
1196
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1200
if(debug){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1202
}
1203
return add_delete_local_route(false, address, if_index);
1204
}
1205
1206
631
/* Called when a Mandos server is found */
1207
__attribute__((nonnull, warn_unused_result))
1208
632
static int start_mandos_communication(const char *ip, in_port_t port,
1209
633
AvahiIfIndex if_index,
1210
634
int af, mandos_context *mc){
1211
635
int ret, tcp_sd = -1;
1212
636
ssize_t sret;
1213
struct sockaddr_storage to;
637
union {
638
struct sockaddr_in in;
639
struct sockaddr_in6 in6;
640
} to;
1214
641
char *buffer = NULL;
1215
642
char *decrypted_buffer = NULL;
1216
643
size_t buffer_length = 0;
1219
646
int retval = -1;
1220
647
gnutls_session_t session;
1221
648
int pf; /* Protocol family */
1222
bool route_added = false;
1223
649
1224
650
errno = 0;
1225
651
1247
673
bool match = false;
1248
674
{
1249
675
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1252
interface))){
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
677
interface))){
1253
678
if(if_nametoindex(interface) == (unsigned int)if_index){
1254
679
match = true;
1255
680
break;
1284
709
PRIuMAX "\n", ip, (uintmax_t)port);
1285
710
}
1286
711
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
1288
713
if(tcp_sd < 0){
1289
714
int e = errno;
1290
715
perror_plus("socket");
1297
722
goto mandos_end;
1298
723
}
1299
724
725
memset(&to, 0, sizeof(to));
1300
726
if(af == AF_INET6){
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
727
to.in6.sin6_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1304
729
} else { /* IPv4 */
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
730
to.in.sin_family = (sa_family_t)af;
731
ret = inet_pton(af, ip, &to.in.sin_addr);
1308
732
}
1309
733
if(ret < 0 ){
1310
734
int e = errno;
1319
743
goto mandos_end;
1320
744
}
1321
745
if(af == AF_INET6){
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
746
to.in6.sin6_port = htons(port);
747
#ifdef __GNUC__
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
750
#endif
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
753
#ifdef __GNUC__
754
#pragma GCC diagnostic pop
755
#endif
1325
756
if(if_index == AVAHI_IF_UNSPEC){
1326
757
fprintf_plus(stderr, "An IPv6 link-local address is"
1327
758
" incomplete without a network interface\n");
1329
760
goto mandos_end;
1330
761
}
1331
762
/* Set the network interface number as scope */
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
763
to.in6.sin6_scope_id = (uint32_t)if_index;
1333
764
}
1334
765
} else {
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
766
to.in.sin_port = htons(port);
1336
767
}
1337
768
1338
769
if(quit_now){
1356
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1357
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1358
789
if(af == AF_INET6){
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
1361
791
addrstr, sizeof(addrstr), NULL, 0,
1362
792
NI_NUMERICHOST);
1363
793
} else {
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
1366
795
addrstr, sizeof(addrstr), NULL, 0,
1367
796
NI_NUMERICHOST);
1368
797
}
1380
809
goto mandos_end;
1381
810
}
1382
811
1383
while(true){
1384
if(af == AF_INET6){
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1387
} else {
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1390
}
1391
if(ret < 0){
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1398
&to)->sin6_addr)))
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1409
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1413
*/
1414
if(debug){
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1416
" direct route\n");
1417
}
1418
int e = errno;
1419
route_added = add_local_route(ip, if_index);
1420
if(route_added){
1421
continue;
1422
}
1423
errno = e;
1424
}
1425
if(errno != ECONNREFUSED or debug){
1426
int e = errno;
1427
perror_plus("connect");
1428
errno = e;
1429
}
1430
goto mandos_end;
1431
}
1432
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
break;
812
if(af == AF_INET6){
813
ret = connect(tcp_sd, &to.in6, sizeof(to));
814
} else {
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
816
}
817
if(ret < 0){
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
819
int e = errno;
820
perror_plus("connect");
821
errno = e;
822
}
823
goto mandos_end;
824
}
825
826
if(quit_now){
827
errno = EINTR;
828
goto mandos_end;
1438
829
}
1439
830
1440
831
const char *out = mandos_protocol_version;
1594
985
&decrypted_buffer, mc);
1595
986
if(decrypted_buffer_size >= 0){
1596
987
1597
clearerr(stdout);
1598
988
written = 0;
1599
989
while(written < (size_t) decrypted_buffer_size){
1600
990
if(quit_now){
1616
1006
}
1617
1007
written += (size_t)ret;
1618
1008
}
1619
ret = fflush(stdout);
1620
if(ret != 0){
1621
int e = errno;
1622
if(debug){
1623
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1624
strerror(errno));
1625
}
1626
errno = e;
1627
goto mandos_end;
1628
}
1629
1009
retval = 0;
1630
1010
}
1631
1011
}
1634
1014
1635
1015
mandos_end:
1636
1016
{
1637
if(route_added){
1638
if(not delete_local_route(ip, if_index)){
1639
fprintf_plus(stderr, "Failed to delete local route to %s on"
1640
" interface %d", ip, if_index);
1641
}
1642
}
1643
1017
int e = errno;
1644
1018
free(decrypted_buffer);
1645
1019
free(buffer);
1646
1020
if(tcp_sd >= 0){
1647
ret = close(tcp_sd);
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1648
1022
}
1649
1023
if(ret == -1){
1650
1024
if(e == 0){
1675
1049
AVAHI_GCC_UNUSED AvahiStringList *txt,
1676
1050
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1677
1051
flags,
1678
void *mc){
1052
void* mc){
1679
1053
if(r == NULL){
1680
1054
return;
1681
1055
}
1684
1058
timed out */
1685
1059
1686
1060
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1688
1061
return;
1689
1062
}
1690
1063
1735
1108
const char *domain,
1736
1109
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1737
1110
flags,
1738
void *mc){
1111
void* mc){
1739
1112
if(b == NULL){
1740
1113
return;
1741
1114
}
1801
1174
errno = old_errno;
1802
1175
}
1803
1176
1804
__attribute__((nonnull, warn_unused_result))
1805
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1806
1178
int ret;
1807
int old_errno;
1179
error_t ret_errno;
1808
1180
1809
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
1182
if(s < 0){
1811
old_errno = errno;
1183
ret_errno = errno;
1812
1184
perror_plus("socket");
1813
errno = old_errno;
1185
errno = ret_errno;
1814
1186
return false;
1815
1187
}
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1188
strcpy(ifr->ifr_name, ifname);
1818
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1819
1190
if(ret == -1){
1820
1191
if(debug){
1821
old_errno = errno;
1192
ret_errno = errno;
1822
1193
perror_plus("ioctl SIOCGIFFLAGS");
1823
errno = old_errno;
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1194
errno = ret_errno;
1829
1195
}
1830
1196
return false;
1831
1197
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1837
1198
return true;
1838
1199
}
1839
1200
1840
__attribute__((nonnull, warn_unused_result))
1841
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1842
1202
1843
1203
/* Reject the loopback device */
1885
1245
* corresponds to an acceptable network device.
1886
1246
* (This function is passed to scandir(3) as a filter function.)
1887
1247
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
1248
int good_interface(const struct dirent *if_entry){
1890
1249
if(if_entry->d_name[0] == '.'){
1891
1250
return 0;
1909
1268
/*
1910
1269
* This function determines if a network interface is up.
1911
1270
*/
1912
__attribute__((nonnull, warn_unused_result))
1913
1271
bool interface_is_up(const char *interface){
1914
1272
struct ifreq ifr;
1915
1273
if(not get_flags(interface, &ifr)){
1926
1284
/*
1927
1285
* This function determines if a network interface is running
1928
1286
*/
1929
__attribute__((nonnull, warn_unused_result))
1930
1287
bool interface_is_running(const char *interface){
1931
1288
struct ifreq ifr;
1932
1289
if(not get_flags(interface, &ifr)){
1940
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1941
1298
}
1942
1299
1943
__attribute__((nonnull, pure, warn_unused_result))
1944
1300
int notdotentries(const struct dirent *direntry){
1945
1301
/* Skip "." and ".." */
1946
1302
if(direntry->d_name[0] == '.'
1953
1309
}
1954
1310
1955
1311
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1957
1312
int runnable_hook(const struct dirent *direntry){
1958
1313
int ret;
1959
1314
size_t sret;
1967
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1968
1323
"abcdefghijklmnopqrstuvwxyz"
1969
1324
"0123456789"
1970
"_.-");
1325
"_-");
1971
1326
if((direntry->d_name)[sret] != '\0'){
1972
1327
/* Contains non-allowed characters */
1973
1328
if(debug){
1977
1332
return 0;
1978
1333
}
1979
1334
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1337
if(ret < 0){
1338
perror_plus("asprintf");
1339
return 0;
1340
}
1341
1342
ret = stat(fullname, &st);
1981
1343
if(ret == -1){
1982
1344
if(debug){
1983
1345
perror_plus("Could not stat hook");
2007
1369
return 1;
2008
1370
}
2009
1371
2010
__attribute__((nonnull, warn_unused_result))
2011
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2012
1373
mandos_context *mc){
2013
1374
int ret;
2017
1378
2018
1379
while(true){
2019
1380
if(mc->current_server == NULL){
2020
if(debug){
1381
if (debug){
2021
1382
fprintf_plus(stderr, "Wait until first server is found."
2022
1383
" No timeout!\n");
2023
1384
}
2024
1385
ret = avahi_simple_poll_iterate(s, -1);
2025
1386
} else {
2026
if(debug){
1387
if (debug){
2027
1388
fprintf_plus(stderr, "Check current_server if we should run"
2028
1389
" it, or wait\n");
2029
1390
}
2046
1407
- ((intmax_t)waited_time.tv_sec * 1000))
2047
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
2048
1409
2049
if(debug){
1410
if (debug){
2050
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2051
1412
block_time);
2052
1413
}
2074
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
2075
1436
}
2076
1437
if(ret != 0){
2077
if(ret > 0 or errno != EINTR){
1438
if (ret > 0 or errno != EINTR){
2078
1439
return (ret != 1) ? ret : 0;
2079
1440
}
2080
1441
}
2081
1442
}
2082
1443
}
2083
1444
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1461
if(ret_errno != 0){
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
if(setuid(0) == -1){
1466
ret_errno = errno;
1467
perror_plus("seteuid");
1468
}
1469
errno = old_errno;
1470
return ret_errno;
1471
}
1472
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1478
ret_errno = errno;
1479
perror_plus("seteuid");
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("setuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
bool run_network_hooks(const char *mode, const char *interface,
2086
1498
const float delay){
2087
struct dirent **direntries = NULL;
2088
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2090
| O_CLOEXEC);
2091
if(hookdir_fd == -1){
2092
if(errno == ENOENT){
2093
if(debug){
2094
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2095
" found\n", hookdir);
2096
}
2097
} else {
2098
perror_plus("open");
2099
}
2100
return;
2101
}
2102
}
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
if(devnull == -1){
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2106
return;
2107
}
2108
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
runnable_hook, alphasort);
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1501
alphasort);
2110
1502
if(numhooks == -1){
2111
perror_plus("scandir");
2112
close(devnull);
2113
return;
2114
}
2115
struct dirent *direntry;
2116
int ret;
2117
for(int i = 0; i < numhooks; i++){
2118
direntry = direntries[i];
2119
if(debug){
2120
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2121
direntry->d_name);
1503
if(errno == ENOENT){
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1507
}
1508
} else {
1509
perror_plus("scandir");
2122
1510
}
2123
pid_t hook_pid = fork();
2124
if(hook_pid == 0){
2125
/* Child */
2126
/* Raise privileges */
2127
errno = raise_privileges_permanently();
2128
if(errno != 0){
2129
perror_plus("Failed to raise privileges");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Set group */
2133
errno = 0;
2134
ret = setgid(0);
2135
if(ret == -1){
2136
perror_plus("setgid");
2137
_exit(EX_NOPERM);
2138
}
2139
/* Reset supplementary groups */
2140
errno = 0;
2141
ret = setgroups(0, NULL);
2142
if(ret == -1){
2143
perror_plus("setgroups");
2144
_exit(EX_NOPERM);
2145
}
2146
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2147
if(ret == -1){
2148
perror_plus("setenv");
2149
_exit(EX_OSERR);
2150
}
2151
ret = setenv("DEVICE", interface, 1);
2152
if(ret == -1){
2153
perror_plus("setenv");
2154
_exit(EX_OSERR);
2155
}
2156
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2157
if(ret == -1){
2158
perror_plus("setenv");
2159
_exit(EX_OSERR);
2160
}
2161
ret = setenv("MODE", mode, 1);
2162
if(ret == -1){
2163
perror_plus("setenv");
2164
_exit(EX_OSERR);
2165
}
2166
char *delaystring;
2167
ret = asprintf(&delaystring, "%f", (double)delay);
2168
if(ret == -1){
1511
} else {
1512
struct dirent *direntry;
1513
int ret;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1519
if(ret < 0){
2169
1520
perror_plus("asprintf");
2170
_exit(EX_OSERR);
2171
}
2172
ret = setenv("DELAY", delaystring, 1);
2173
if(ret == -1){
1521
continue;
1522
}
1523
if(debug){
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1525
direntry->d_name);
1526
}
1527
pid_t hook_pid = fork();
1528
if(hook_pid == 0){
1529
/* Child */
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1532
/* Set group */
1533
errno = 0;
1534
ret = setgid(0);
1535
if(ret == -1){
1536
perror_plus("setgid");
1537
}
1538
/* Reset supplementary groups */
1539
errno = 0;
1540
ret = setgroups(0, NULL);
1541
if(ret == -1){
1542
perror_plus("setgroups");
1543
}
1544
dup2(devnull, STDIN_FILENO);
1545
close(devnull);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1548
if(ret == -1){
1549
perror_plus("setenv");
1550
_exit(EX_OSERR);
1551
}
1552
ret = setenv("DEVICE", interface, 1);
1553
if(ret == -1){
1554
perror_plus("setenv");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1558
if(ret == -1){
1559
perror_plus("setenv");
1560
_exit(EX_OSERR);
1561
}
1562
ret = setenv("MODE", mode, 1);
1563
if(ret == -1){
1564
perror_plus("setenv");
1565
_exit(EX_OSERR);
1566
}
1567
char *delaystring;
1568
ret = asprintf(&delaystring, "%f", delay);
1569
if(ret == -1){
1570
perror_plus("asprintf");
1571
_exit(EX_OSERR);
1572
}
1573
ret = setenv("DELAY", delaystring, 1);
1574
if(ret == -1){
1575
free(delaystring);
1576
perror_plus("setenv");
1577
_exit(EX_OSERR);
1578
}
2174
1579
free(delaystring);
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
free(delaystring);
2179
if(connect_to != NULL){
2180
ret = setenv("CONNECT", connect_to, 1);
2181
if(ret == -1){
2182
perror_plus("setenv");
2183
_exit(EX_OSERR);
2184
}
2185
}
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2187
direntry->d_name,
2188
O_RDONLY));
2189
if(hook_fd == -1){
2190
perror_plus("openat");
2191
_exit(EXIT_FAILURE);
2192
}
2193
if(close(hookdir_fd) == -1){
2194
perror_plus("close");
2195
_exit(EXIT_FAILURE);
2196
}
2197
ret = dup2(devnull, STDIN_FILENO);
2198
if(ret == -1){
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2200
_exit(EX_OSERR);
2201
}
2202
ret = close(devnull);
2203
if(ret == -1){
2204
perror_plus("close");
2205
_exit(EX_OSERR);
2206
}
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2208
if(ret == -1){
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2210
_exit(EX_OSERR);
2211
}
2212
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2213
environ) == -1){
2214
perror_plus("fexecve");
2215
_exit(EXIT_FAILURE);
2216
}
2217
} else {
2218
if(hook_pid == -1){
2219
perror_plus("fork");
2220
free(direntry);
2221
continue;
2222
}
2223
int status;
2224
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
perror_plus("waitpid");
2226
free(direntry);
2227
continue;
2228
}
2229
if(WIFEXITED(status)){
2230
if(WEXITSTATUS(status) != 0){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
" with status %d\n", direntry->d_name,
2233
WEXITSTATUS(status));
2234
free(direntry);
2235
continue;
2236
}
2237
} else if(WIFSIGNALED(status)){
2238
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
" signal %d\n", direntry->d_name,
2240
WTERMSIG(status));
2241
free(direntry);
2242
continue;
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
}
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1590
}
2243
1591
} else {
2244
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
" crashed\n", direntry->d_name);
2246
free(direntry);
2247
continue;
2248
}
2249
}
2250
if(debug){
2251
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2252
direntry->d_name);
2253
}
2254
free(direntry);
2255
}
2256
free(direntries);
2257
if(close(hookdir_fd) == -1){
2258
perror_plus("close");
2259
} else {
2260
hookdir_fd = -1;
2261
}
2262
close(devnull);
1592
int status;
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1595
free(fullname);
1596
continue;
1597
}
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1603
free(fullname);
1604
continue;
1605
}
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1609
WTERMSIG(status));
1610
free(fullname);
1611
continue;
1612
} else {
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1615
free(fullname);
1616
continue;
1617
}
1618
}
1619
free(fullname);
1620
if(debug){
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1622
direntry->d_name);
1623
}
1624
}
1625
close(devnull);
1626
}
1627
return true;
2263
1628
}
2264
1629
2265
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2267
const float delay){
2268
int old_errno = errno;
2269
int ret;
1630
error_t bring_up_interface(const char *const interface,
1631
const float delay){
1632
int sd = -1;
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
2270
1636
struct ifreq network;
2271
1637
unsigned int if_index = if_nametoindex(interface);
2272
1638
if(if_index == 0){
2281
1647
}
2282
1648
2283
1649
if(not interface_is_up(interface)){
2284
int ret_errno = 0;
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
1650
if(not get_flags(interface, &network) and debug){
2287
1651
ret_errno = errno;
2288
1652
fprintf_plus(stderr, "Failed to get flags for interface "
2289
1653
"\"%s\"\n", interface);
2290
errno = old_errno;
2291
1654
return ret_errno;
2292
1655
}
2293
network.ifr_flags |= IFF_UP; /* set flag */
1656
network.ifr_flags |= IFF_UP;
2294
1657
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2296
if(sd == -1){
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1659
if(sd < 0){
2297
1660
ret_errno = errno;
2298
1661
perror_plus("socket");
2299
1662
errno = old_errno;
2300
1663
return ret_errno;
2301
1664
}
2302
1665
2303
1666
if(quit_now){
2304
ret = close(sd);
2305
if(ret == -1){
2306
perror_plus("close");
2307
}
1667
close(sd);
2308
1668
errno = old_errno;
2309
1669
return EINTR;
2310
1670
}
2314
1674
interface);
2315
1675
}
2316
1676
2317
/* Raise privileges */
2318
ret_errno = raise_privileges();
2319
if(ret_errno != 0){
2320
errno = ret_errno;
2321
perror_plus("Failed to raise privileges");
2322
}
1677
/* Raise priviliges */
1678
raise_privileges();
2323
1679
2324
1680
#ifdef __linux__
2325
int ret_linux;
2326
bool restore_loglevel = false;
2327
if(ret_errno == 0){
2328
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2329
messages about the network interface to mess up the prompt */
2330
ret_linux = klogctl(8, NULL, 5);
2331
if(ret_linux == -1){
2332
perror_plus("klogctl");
2333
} else {
2334
restore_loglevel = true;
2335
}
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
2336
1688
}
2337
1689
#endif /* __linux__ */
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1691
ret_errno = errno;
2340
1692
#ifdef __linux__
2341
1693
if(restore_loglevel){
2342
1694
ret_linux = klogctl(7, NULL, 0);
2346
1698
}
2347
1699
#endif /* __linux__ */
2348
1700
2349
/* If raise_privileges() succeeded above */
2350
if(ret_errno == 0){
2351
/* Lower privileges */
2352
ret_errno = lower_privileges();
2353
if(ret_errno != 0){
2354
errno = ret_errno;
2355
perror_plus("Failed to lower privileges");
2356
}
2357
}
1701
/* Lower privileges */
1702
lower_privileges();
2358
1703
2359
1704
/* Close the socket */
2360
ret = close(sd);
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2361
1706
if(ret == -1){
2362
1707
perror_plus("close");
2363
1708
}
2364
1709
2365
1710
if(ret_setflags == -1){
2366
errno = ioctl_errno;
1711
errno = ret_errno;
2367
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2368
1713
errno = old_errno;
2369
return ioctl_errno;
1714
return ret_errno;
2370
1715
}
2371
1716
} else if(debug){
2372
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2375
1720
2376
1721
/* Sleep checking until interface is running.
2377
1722
Check every 0.25s, up to total time of delay */
2378
for(int i = 0; i < delay * 4; i++){
1723
for(int i=0; i < delay * 4; i++){
2379
1724
if(interface_is_running(interface)){
2380
1725
break;
2381
1726
}
2390
1735
return 0;
2391
1736
}
2392
1737
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
2396
1740
struct ifreq network;
2397
1741
unsigned int if_index = if_nametoindex(interface);
2398
1742
if(if_index == 0){
2401
1745
return ENXIO;
2402
1746
}
2403
1747
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
1748
error_t ret_errno = 0;
2406
1749
if(not get_flags(interface, &network) and debug){
2407
1750
ret_errno = errno;
2408
1751
fprintf_plus(stderr, "Failed to get flags for interface "
2409
1752
"\"%s\"\n", interface);
2410
errno = old_errno;
2411
1753
return ret_errno;
2412
1754
}
2413
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2414
1756
2415
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2416
if(sd == -1){
1758
if(sd < 0){
2417
1759
ret_errno = errno;
2418
1760
perror_plus("socket");
2419
1761
errno = old_errno;
2425
1767
interface);
2426
1768
}
2427
1769
2428
/* Raise privileges */
2429
ret_errno = raise_privileges();
2430
if(ret_errno != 0){
2431
errno = ret_errno;
2432
perror_plus("Failed to raise privileges");
2433
}
1770
/* Raise priviliges */
1771
raise_privileges();
2434
1772
2435
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
1774
ret_errno = errno;
2437
1775
2438
/* If raise_privileges() succeeded above */
2439
if(ret_errno == 0){
2440
/* Lower privileges */
2441
ret_errno = lower_privileges();
2442
if(ret_errno != 0){
2443
errno = ret_errno;
2444
perror_plus("Failed to lower privileges");
2445
}
2446
}
1776
/* Lower privileges */
1777
lower_privileges();
2447
1778
2448
1779
/* Close the socket */
2449
int ret = close(sd);
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2450
1781
if(ret == -1){
2451
1782
perror_plus("close");
2452
1783
}
2453
1784
2454
1785
if(ret_setflags == -1){
2455
errno = ioctl_errno;
1786
errno = ret_errno;
2456
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2457
1788
errno = old_errno;
2458
return ioctl_errno;
1789
return ret_errno;
2459
1790
}
2460
1791
} else if(debug){
2461
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2467
1798
}
2468
1799
2469
1800
int main(int argc, char *argv[]){
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
":%PROFILE_ULTRA",
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#else
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
#endif
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
2483
1805
AvahiSServiceBrowser *sb = NULL;
2484
1806
error_t ret_errno;
2485
1807
int ret;
2488
1810
int exitcode = EXIT_SUCCESS;
2489
1811
char *interfaces_to_take_down = NULL;
2490
1812
size_t interfaces_to_take_down_size = 0;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1814
bool tempdir_created = false;
2494
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2495
1816
const char *seckey = PATHDIR "/" SECKEY;
2496
1817
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2500
#endif
2501
const char *dh_params_file = NULL;
2502
1818
char *interfaces_hooks = NULL;
2503
1819
2504
1820
bool gnutls_initialized = false;
2551
1867
{ .name = "pubkey", .key = 'p',
2552
1868
.arg = "FILE",
2553
1869
.doc = "OpenPGP public key file base name",
2554
.group = 1 },
2555
{ .name = "tls-privkey", .key = 't',
2556
.arg = "FILE",
2557
#if GNUTLS_VERSION_NUMBER >= 0x030606
2558
.doc = "TLS private key file base name",
2559
#else
2560
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2561
#endif
2562
.group = 1 },
2563
{ .name = "tls-pubkey", .key = 'T',
2564
.arg = "FILE",
2565
#if GNUTLS_VERSION_NUMBER >= 0x030606
2566
.doc = "TLS public key file base name",
2567
#else
2568
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2569
#endif
2570
.group = 1 },
1870
.group = 2 },
2571
1871
{ .name = "dh-bits", .key = 129,
2572
1872
.arg = "BITS",
2573
1873
.doc = "Bit length of the prime number used in the"
2574
1874
" Diffie-Hellman key exchange",
2575
1875
.group = 2 },
2576
{ .name = "dh-params", .key = 134,
2577
.arg = "FILE",
2578
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2579
" for the Diffie-Hellman key exchange",
2580
.group = 2 },
2581
1876
{ .name = "priority", .key = 130,
2582
1877
.arg = "STRING",
2583
1878
.doc = "GnuTLS priority string for the TLS handshake",
2629
1924
case 'p': /* --pubkey */
2630
1925
pubkey = arg;
2631
1926
break;
2632
case 't': /* --tls-privkey */
2633
#if GNUTLS_VERSION_NUMBER >= 0x030606
2634
tls_privkey = arg;
2635
#endif
2636
break;
2637
case 'T': /* --tls-pubkey */
2638
#if GNUTLS_VERSION_NUMBER >= 0x030606
2639
tls_pubkey = arg;
2640
#endif
2641
break;
2642
1927
case 129: /* --dh-bits */
2643
1928
errno = 0;
2644
1929
tmpmax = strtoimax(arg, &tmp, 10);
2648
1933
}
2649
1934
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2650
1935
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
2654
1936
case 130: /* --priority */
2655
1937
mc.priority = arg;
2656
1938
break;
2679
1961
argp_state_help(state, state->out_stream,
2680
1962
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2681
1963
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
2683
1964
case -3: /* --usage */
2684
1965
argp_state_help(state, state->out_stream,
2685
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
2687
1967
case 'V': /* --version */
2688
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2689
1969
exit(argp_err_exit_status);
2698
1978
.args_doc = "",
2699
1979
.doc = "Mandos client -- Get and decrypt"
2700
1980
" passwords from a Mandos server" };
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2703
switch(ret_errno){
1981
ret = argp_parse(&argp, argc, argv,
1982
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1983
switch(ret){
2704
1984
case 0:
2705
1985
break;
2706
1986
case ENOMEM:
2707
1987
default:
2708
errno = ret_errno;
1988
errno = ret;
2709
1989
perror_plus("argp_parse");
2710
1990
exitcode = EX_OSERR;
2711
1991
goto end;
2714
1994
goto end;
2715
1995
}
2716
1996
}
2717
1997
2718
1998
{
2719
1999
/* Work around Debian bug #633582:
2720
<https://bugs.debian.org/633582> */
2000
<http://bugs.debian.org/633582> */
2721
2001
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2724
if(ret != 0){
2725
errno = ret;
2726
perror_plus("Failed to raise privileges");
2727
} else {
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2728
2004
struct stat st;
2729
2005
2730
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2744
2020
}
2745
2021
}
2746
2022
}
2747
close(seckey_fd);
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2748
2024
}
2749
2025
}
2750
2026
2751
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2752
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2753
2029
if(pubkey_fd == -1){
2765
2041
}
2766
2042
}
2767
2043
}
2768
close(pubkey_fd);
2769
}
2770
}
2771
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2777
} else {
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2779
if(ret == -1){
2780
perror_plus("fstat");
2781
} else {
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2785
if(ret == -1){
2786
perror_plus("fchown");
2787
}
2788
}
2789
}
2790
close(dhparams_fd);
2791
}
2792
}
2793
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2045
}
2046
}
2047
2794
2048
/* Lower privileges */
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2798
perror_plus("Failed to lower privileges");
2799
}
2049
lower_privileges();
2800
2050
}
2801
2051
}
2802
2052
2828
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2829
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2830
2080
}
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2083
goto end;
2084
}
2833
2085
}
2834
2086
2835
2087
if(not debug){
2913
2165
2914
2166
/* If no interfaces were specified, make a list */
2915
2167
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2168
struct dirent **direntries;
2917
2169
/* Look for any good interfaces */
2918
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2919
2171
alphasort);
2925
2177
if(ret_errno != 0){
2926
2178
errno = ret_errno;
2927
2179
perror_plus("argz_add");
2928
free(direntries[i]);
2929
2180
continue;
2930
2181
}
2931
2182
if(debug){
2932
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2933
2184
direntries[i]->d_name);
2934
2185
}
2935
free(direntries[i]);
2936
2186
}
2937
2187
free(direntries);
2938
2188
} else {
2939
if(ret == 0){
2940
free(direntries);
2941
}
2189
free(direntries);
2942
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2943
2191
exitcode = EXIT_FAILURE;
2944
2192
goto end;
2967
2215
break;
2968
2216
}
2969
2217
bool interface_was_up = interface_is_up(interface);
2970
errno = bring_up_interface(interface, delay);
2218
ret = bring_up_interface(interface, delay);
2971
2219
if(not interface_was_up){
2972
if(errno != 0){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2220
if(ret != 0){
2221
errno = ret;
2222
perror_plus("Failed to bring up interface");
2975
2223
} else {
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2978
interface);
2979
if(errno != 0){
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2226
interface);
2227
if(ret_errno != 0){
2228
errno = ret_errno;
2980
2229
perror_plus("argz_add");
2981
2230
}
2982
2231
}
3000
2249
goto end;
3001
2250
}
3002
2251
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3007
#else
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3009
#endif
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
3010
2253
if(ret == -1){
3011
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
3012
2255
exitcode = EX_UNAVAILABLE;
3019
2262
goto end;
3020
2263
}
3021
2264
3022
/* Try /run/tmp before /tmp */
3023
tempdir = mkdtemp(run_tempdir);
3024
if(tempdir == NULL and errno == ENOENT){
3025
if(debug){
3026
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3027
run_tempdir, old_tempdir);
3028
}
3029
tempdir = mkdtemp(old_tempdir);
3030
}
3031
if(tempdir == NULL){
2265
if(mkdtemp(tempdir) == NULL){
3032
2266
perror_plus("mkdtemp");
3033
2267
goto end;
3034
2268
}
2269
tempdir_created = true;
3035
2270
3036
2271
if(quit_now){
3037
2272
goto end;
3112
2347
sleep((unsigned int)retry_interval);
3113
2348
}
3114
2349
3115
if(not quit_now){
2350
if (not quit_now){
3116
2351
exitcode = EXIT_SUCCESS;
3117
2352
}
3118
2353
3134
2369
3135
2370
/* Allocate a new server */
3136
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3137
&config, NULL, NULL, &ret);
2372
&config, NULL, NULL, &ret_errno);
3138
2373
3139
2374
/* Free the Avahi configuration data */
3140
2375
avahi_server_config_free(&config);
3143
2378
/* Check if creating the Avahi server object succeeded */
3144
2379
if(mc.server == NULL){
3145
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3146
avahi_strerror(ret));
2381
avahi_strerror(ret_errno));
3147
2382
exitcode = EX_UNAVAILABLE;
3148
2383
goto end;
3149
2384
}
3173
2408
if(debug){
3174
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
3175
2410
}
3176
2411
3177
2412
ret = avahi_loop_with_timeout(simple_poll,
3178
2413
(int)(retry_interval * 1000), &mc);
3179
2414
if(debug){
3184
2419
end:
3185
2420
3186
2421
if(debug){
3187
if(signal_received){
3188
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3189
argv[0], signal_received,
3190
strsignal(signal_received));
3191
} else {
3192
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
}
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3194
2423
}
3195
2424
3196
2425
/* Cleanup things */
3207
2436
3208
2437
if(gnutls_initialized){
3209
2438
gnutls_certificate_free_credentials(mc.cred);
2439
gnutls_global_deinit();
3210
2440
gnutls_dh_params_deinit(mc.dh_params);
3211
2441
}
3212
2442
3220
2450
mc.current_server->prev->next = NULL;
3221
2451
while(mc.current_server != NULL){
3222
2452
server *next = mc.current_server->next;
3223
#ifdef __GNUC__
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3226
#endif
3227
free((char *)(mc.current_server->ip));
3228
#ifdef __GNUC__
3229
#pragma GCC diagnostic pop
3230
#endif
3231
2453
free(mc.current_server);
3232
2454
mc.current_server = next;
3233
2455
}
3234
2456
}
3235
2457
3236
/* Re-raise privileges */
2458
/* Re-raise priviliges */
3237
2459
{
3238
ret = raise_privileges();
3239
if(ret != 0){
3240
errno = ret;
3241
perror_plus("Failed to raise privileges");
3242
} else {
3243
3244
/* Run network hooks */
3245
run_network_hooks("stop", interfaces_hooks != NULL ?
3246
interfaces_hooks : "", delay);
3247
3248
/* Take down the network interfaces which were brought up */
3249
{
3250
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3253
interface))){
3254
ret = take_down_interface(interface);
3255
if(ret != 0){
3256
errno = ret;
3257
perror_plus("Failed to take down interface");
3258
}
3259
}
3260
if(debug and (interfaces_to_take_down == NULL)){
3261
fprintf_plus(stderr, "No interfaces needed to be taken"
3262
" down\n");
3263
}
3264
}
3265
}
3266
3267
ret = lower_privileges_permanently();
3268
if(ret != 0){
3269
errno = ret;
3270
perror_plus("Failed to lower privileges permanently");
3271
}
2460
raise_privileges();
2461
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2465
2466
/* Take down the network interfaces which were brought up */
2467
{
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2471
interface))){
2472
ret_errno = take_down_interface(interface);
2473
if(ret_errno != 0){
2474
errno = ret_errno;
2475
perror_plus("Failed to take down interface");
2476
}
2477
}
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2480
" down\n");
2481
}
2482
}
2483
2484
lower_privileges_permanently();
3272
2485
}
3273
2486
3274
2487
free(interfaces_to_take_down);
3275
2488
free(interfaces_hooks);
3276
2489
3277
void clean_dir_at(int base, const char * const dirname,
3278
uintmax_t level){
2490
/* Removes the GPGME temp directory and all files inside */
2491
if(tempdir_created){
3279
2492
struct dirent **direntries = NULL;
3280
int dret;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3282
O_RDONLY
3283
| O_NOFOLLOW
3284
| O_DIRECTORY
3285
| O_PATH));
3286
if(dir_fd == -1){
3287
perror_plus("open");
3288
return;
3289
}
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2495
alphasort);
2496
if (numentries > 0){
3293
2497
for(int i = 0; i < numentries; i++){
3294
if(debug){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3297
}
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3299
if(dret == -1){
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3302
AT_REMOVEDIR);
3303
}
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3309
dret = 0;
3310
}
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3314
}
3315
}
3316
free(direntries[i]);
3317
}
3318
3319
/* need to clean even if 0 because man page doesn't specify */
3320
free(direntries);
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3324
}
3325
} else {
3326
perror_plus("scandirat");
3327
}
3328
close(dir_fd);
3329
}
3330
3331
/* Removes the GPGME temp directory and all files inside */
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
2498
direntry = direntries[i];
2499
char *fullname = NULL;
2500
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
direntry->d_name);
2502
if(ret < 0){
2503
perror_plus("asprintf");
2504
continue;
2505
}
2506
ret = remove(fullname);
2507
if(ret == -1){
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2509
strerror(errno));
2510
}
2511
free(fullname);
2512
}
2513
}
2514
2515
/* need to clean even if 0 because man page doesn't specify */
2516
free(direntries);
2517
if (numentries == -1){
2518
perror_plus("scandir");
2519
}
2520
ret = rmdir(tempdir);
2521
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
2523
}
3334
2524
}
3335
2525
3336
2526
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0