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237.7.201
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-01-21 21:37:44 UTC
- mfrom: (308 release)
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: teddy@recompile.se-20140121213744-xu4odolayuxn78wi
Merge from release branch.
- files added:
- initramfs-tools-hook-conf
- 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,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
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,
64
#include <errno.h> /* perror(), errno,
72
65
program_invocation_short_name */
73
66
#include <time.h> /* nanosleep(), time(), sleep() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
99
91
argz_delete(), argz_append(),
100
92
argz_stringify(), argz_add(),
101
93
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
94
105
95
#ifdef __linux__
106
96
#include <sys/klog.h> /* klogctl() */
123
113
gnutls_*
124
114
init_gnutls_session(),
125
115
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
116
#include <gnutls/openpgp.h>
128
117
/* gnutls_certificate_set_openpgp_key_file(),
129
118
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
119
136
120
/* GPGME */
137
121
#include <gpgme.h> /* All GPGME types, constants and
145
129
#define PATHDIR "/conf/conf.d/mandos"
146
130
#define SECKEY "seckey.txt"
147
131
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
133
152
134
bool debug = false;
156
138
static const char sys_class_net[] = "/sys/class/net";
157
139
char *connect_to = NULL;
158
140
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
141
uid_t uid = 65534;
161
142
gid_t gid = 65534;
162
143
199
180
perror(print_text);
200
181
}
201
182
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
203
184
int fprintf_plus(FILE *stream, const char *format, ...){
204
185
va_list ap;
205
186
va_start (ap, format);
214
195
* bytes. "buffer_capacity" is how much is currently allocated,
215
196
* "buffer_length" is how much is already used.
216
197
*/
217
__attribute__((nonnull, warn_unused_result))
218
198
size_t incbuffer(char **buffer, size_t buffer_length,
219
199
size_t buffer_capacity){
220
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
227
203
return 0;
228
204
}
229
*buffer = new_buf;
230
205
buffer_capacity += BUFFER_SIZE;
231
206
}
232
207
return buffer_capacity;
233
208
}
234
209
235
210
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
212
int af, server **current_server){
239
213
int ret;
248
222
.af = af };
249
223
if(new_server->ip == NULL){
250
224
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);
266
225
return false;
267
226
}
268
227
/* Special case of first server */
270
229
new_server->next = new_server;
271
230
new_server->prev = new_server;
272
231
*current_server = new_server;
232
/* Place the new server last in the list */
273
233
} else {
274
/* Place the new server last in the list */
275
234
new_server->next = *current_server;
276
235
new_server->prev = (*current_server)->prev;
277
236
new_server->prev->next = new_server;
278
237
(*current_server)->prev = new_server;
279
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
280
244
return true;
281
245
}
282
246
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
247
/*
336
248
* Initialize GPGME.
337
249
*/
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){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
343
252
gpgme_error_t rc;
344
253
gpgme_engine_info_t engine_info;
345
254
346
255
/*
347
256
* Helper function to insert pub and seckey to the engine keyring.
348
257
*/
349
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
350
259
int ret;
351
260
int fd;
352
261
gpgme_data_t pgp_data;
357
266
return false;
358
267
}
359
268
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
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
270
if(rc != GPG_ERR_NO_ERROR){
412
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
420
279
gpgme_strsource(rc), gpgme_strerror(rc));
421
280
return false;
422
281
}
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
282
499
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
284
if(ret == -1){
501
285
perror_plus("close");
502
286
}
541
325
/* Create new GPGME "context" */
542
326
rc = gpgme_new(&(mc->ctx));
543
327
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
546
331
return false;
547
332
}
548
333
557
342
* Decrypt OpenPGP data.
558
343
* Returns -1 on error
559
344
*/
560
__attribute__((nonnull, warn_unused_result))
561
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
562
346
size_t crypto_size,
563
347
char **plaintext,
584
368
/* Create new empty GPGME data buffer for the plaintext */
585
369
rc = gpgme_data_new(&dh_plain);
586
370
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
588
373
gpgme_strsource(rc), gpgme_strerror(rc));
589
374
gpgme_data_release(dh_crypto);
590
375
return -1;
603
388
if(result == NULL){
604
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
390
} 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");
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);
612
395
if(result->file_name != NULL){
613
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
397
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
618
401
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);
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
405
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
623
409
}
624
410
}
625
411
}
681
467
return plaintext_length;
682
468
}
683
469
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){
470
static const char * safer_gnutls_strerror(int value){
693
471
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
695
475
}
696
476
697
477
/* GnuTLS log function callback */
698
__attribute__((nonnull))
699
478
static void debuggnutls(__attribute__((unused)) int level,
700
479
const char* string){
701
480
fprintf_plus(stderr, "GnuTLS: %s", string);
702
481
}
703
482
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
705
483
static int init_gnutls_global(const char *pubkeyfilename,
706
484
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
485
mandos_context *mc){
709
486
int ret;
710
487
712
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
490
}
714
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
715
499
if(debug){
716
500
/* "Use a log level over 10 to enable all debugging options."
717
501
* - GnuTLS manual
725
509
if(ret != GNUTLS_E_SUCCESS){
726
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
728
513
return -1;
729
514
}
730
515
731
516
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
734
519
pubkeyfilename,
735
520
seckeyfilename);
736
521
}
737
522
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
523
ret = gnutls_certificate_set_openpgp_key_file
752
524
(mc->cred, pubkeyfilename, seckeyfilename,
753
525
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
526
if(ret != GNUTLS_E_SUCCESS){
758
527
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
531
safer_gnutls_strerror(ret));
771
540
safer_gnutls_strerror(ret));
772
541
goto globalfail;
773
542
}
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
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
956
551
957
552
return 0;
958
553
959
554
globalfail:
960
555
961
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
962
558
gnutls_dh_params_deinit(mc->dh_params);
963
559
return -1;
964
560
}
965
561
966
__attribute__((nonnull, warn_unused_result))
967
562
static int init_gnutls_session(gnutls_session_t *session,
968
563
mandos_context *mc){
969
564
int ret;
970
565
/* GnuTLS session creation */
971
566
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
));
567
ret = gnutls_init(session, GNUTLS_SERVER);
980
568
if(quit_now){
981
569
return -1;
982
570
}
1023
611
/* ignore client certificate if any. */
1024
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
1026
616
return 0;
1027
617
}
1028
618
1030
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
621
__attribute__((unused)) const char *txt){}
1032
622
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
623
/* Called when a Mandos server is found */
1207
__attribute__((nonnull, warn_unused_result))
1208
624
static int start_mandos_communication(const char *ip, in_port_t port,
1209
625
AvahiIfIndex if_index,
1210
626
int af, mandos_context *mc){
1211
627
int ret, tcp_sd = -1;
1212
628
ssize_t sret;
1213
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1214
633
char *buffer = NULL;
1215
634
char *decrypted_buffer = NULL;
1216
635
size_t buffer_length = 0;
1219
638
int retval = -1;
1220
639
gnutls_session_t session;
1221
640
int pf; /* Protocol family */
1222
bool route_added = false;
1223
641
1224
642
errno = 0;
1225
643
1247
665
bool match = false;
1248
666
{
1249
667
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1252
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1253
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1254
671
match = true;
1255
672
break;
1284
701
PRIuMAX "\n", ip, (uintmax_t)port);
1285
702
}
1286
703
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1288
705
if(tcp_sd < 0){
1289
706
int e = errno;
1290
707
perror_plus("socket");
1297
714
goto mandos_end;
1298
715
}
1299
716
717
memset(&to, 0, sizeof(to));
1300
718
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);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1304
721
} 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);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
1308
724
}
1309
725
if(ret < 0 ){
1310
726
int e = errno;
1319
735
goto mandos_end;
1320
736
}
1321
737
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)){
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
1325
748
if(if_index == AVAHI_IF_UNSPEC){
1326
749
fprintf_plus(stderr, "An IPv6 link-local address is"
1327
750
" incomplete without a network interface\n");
1329
752
goto mandos_end;
1330
753
}
1331
754
/* Set the network interface number as scope */
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
755
to.in6.sin6_scope_id = (uint32_t)if_index;
1333
756
}
1334
757
} else {
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
758
to.in.sin_port = htons(port);
1336
759
}
1337
760
1338
761
if(quit_now){
1355
778
}
1356
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1357
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1358
if(af == AF_INET6){
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
1361
addrstr, sizeof(addrstr), NULL, 0,
1362
NI_NUMERICHOST);
1363
} else {
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
1366
addrstr, sizeof(addrstr), NULL, 0,
1367
NI_NUMERICHOST);
1368
}
1369
if(ret == EAI_SYSTEM){
1370
perror_plus("getnameinfo");
1371
} else if(ret != 0) {
1372
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1373
} else if(strcmp(addrstr, ip) != 0){
1374
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1375
}
1376
}
1377
1378
if(quit_now){
1379
errno = EINTR;
1380
goto mandos_end;
1381
}
1382
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;
781
const char *pcret;
782
if(af == AF_INET6){
783
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
784
sizeof(addrstr));
785
} else {
786
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
787
sizeof(addrstr));
788
}
789
if(pcret == NULL){
790
perror_plus("inet_ntop");
791
} else {
792
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
794
}
795
}
796
}
797
798
if(quit_now){
799
errno = EINTR;
800
goto mandos_end;
801
}
802
803
if(af == AF_INET6){
804
ret = connect(tcp_sd, &to.in6, sizeof(to));
805
} else {
806
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
807
}
808
if(ret < 0){
809
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
810
int e = errno;
811
perror_plus("connect");
812
errno = e;
813
}
814
goto mandos_end;
815
}
816
817
if(quit_now){
818
errno = EINTR;
819
goto mandos_end;
1438
820
}
1439
821
1440
822
const char *out = mandos_protocol_version;
1594
976
&decrypted_buffer, mc);
1595
977
if(decrypted_buffer_size >= 0){
1596
978
1597
clearerr(stdout);
1598
979
written = 0;
1599
980
while(written < (size_t) decrypted_buffer_size){
1600
981
if(quit_now){
1616
997
}
1617
998
written += (size_t)ret;
1618
999
}
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
1000
retval = 0;
1630
1001
}
1631
1002
}
1634
1005
1635
1006
mandos_end:
1636
1007
{
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
1008
int e = errno;
1644
1009
free(decrypted_buffer);
1645
1010
free(buffer);
1646
1011
if(tcp_sd >= 0){
1647
ret = close(tcp_sd);
1012
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1648
1013
}
1649
1014
if(ret == -1){
1650
1015
if(e == 0){
1675
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
1676
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1677
1042
flags,
1678
void *mc){
1043
void* mc){
1679
1044
if(r == NULL){
1680
1045
return;
1681
1046
}
1684
1049
timed out */
1685
1050
1686
1051
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1688
1052
return;
1689
1053
}
1690
1054
1735
1099
const char *domain,
1736
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1737
1101
flags,
1738
void *mc){
1102
void* mc){
1739
1103
if(b == NULL){
1740
1104
return;
1741
1105
}
1801
1165
errno = old_errno;
1802
1166
}
1803
1167
1804
__attribute__((nonnull, warn_unused_result))
1805
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1806
1169
int ret;
1807
int old_errno;
1170
error_t ret_errno;
1808
1171
1809
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
1173
if(s < 0){
1811
old_errno = errno;
1174
ret_errno = errno;
1812
1175
perror_plus("socket");
1813
errno = old_errno;
1176
errno = ret_errno;
1814
1177
return false;
1815
1178
}
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1179
strcpy(ifr->ifr_name, ifname);
1818
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1819
1181
if(ret == -1){
1820
1182
if(debug){
1821
old_errno = errno;
1183
ret_errno = errno;
1822
1184
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;
1185
errno = ret_errno;
1829
1186
}
1830
1187
return false;
1831
1188
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1837
1189
return true;
1838
1190
}
1839
1191
1840
__attribute__((nonnull, warn_unused_result))
1841
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1842
1193
1843
1194
/* Reject the loopback device */
1885
1236
* corresponds to an acceptable network device.
1886
1237
* (This function is passed to scandir(3) as a filter function.)
1887
1238
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
1239
int good_interface(const struct dirent *if_entry){
1890
1240
if(if_entry->d_name[0] == '.'){
1891
1241
return 0;
1909
1259
/*
1910
1260
* This function determines if a network interface is up.
1911
1261
*/
1912
__attribute__((nonnull, warn_unused_result))
1913
1262
bool interface_is_up(const char *interface){
1914
1263
struct ifreq ifr;
1915
1264
if(not get_flags(interface, &ifr)){
1926
1275
/*
1927
1276
* This function determines if a network interface is running
1928
1277
*/
1929
__attribute__((nonnull, warn_unused_result))
1930
1278
bool interface_is_running(const char *interface){
1931
1279
struct ifreq ifr;
1932
1280
if(not get_flags(interface, &ifr)){
1940
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1941
1289
}
1942
1290
1943
__attribute__((nonnull, pure, warn_unused_result))
1944
1291
int notdotentries(const struct dirent *direntry){
1945
1292
/* Skip "." and ".." */
1946
1293
if(direntry->d_name[0] == '.'
1953
1300
}
1954
1301
1955
1302
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1957
1303
int runnable_hook(const struct dirent *direntry){
1958
1304
int ret;
1959
1305
size_t sret;
1967
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1968
1314
"abcdefghijklmnopqrstuvwxyz"
1969
1315
"0123456789"
1970
"_.-");
1316
"_-");
1971
1317
if((direntry->d_name)[sret] != '\0'){
1972
1318
/* Contains non-allowed characters */
1973
1319
if(debug){
1977
1323
return 0;
1978
1324
}
1979
1325
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1981
1334
if(ret == -1){
1982
1335
if(debug){
1983
1336
perror_plus("Could not stat hook");
2007
1360
return 1;
2008
1361
}
2009
1362
2010
__attribute__((nonnull, warn_unused_result))
2011
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2012
1364
mandos_context *mc){
2013
1365
int ret;
2017
1369
2018
1370
while(true){
2019
1371
if(mc->current_server == NULL){
2020
if(debug){
1372
if (debug){
2021
1373
fprintf_plus(stderr, "Wait until first server is found."
2022
1374
" No timeout!\n");
2023
1375
}
2024
1376
ret = avahi_simple_poll_iterate(s, -1);
2025
1377
} else {
2026
if(debug){
1378
if (debug){
2027
1379
fprintf_plus(stderr, "Check current_server if we should run"
2028
1380
" it, or wait\n");
2029
1381
}
2046
1398
- ((intmax_t)waited_time.tv_sec * 1000))
2047
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
2048
1400
2049
if(debug){
1401
if (debug){
2050
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2051
1403
block_time);
2052
1404
}
2074
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
2075
1427
}
2076
1428
if(ret != 0){
2077
if(ret > 0 or errno != EINTR){
1429
if (ret > 0 or errno != EINTR){
2078
1430
return (ret != 1) ? ret : 0;
2079
1431
}
2080
1432
}
2081
1433
}
2082
1434
}
2083
1435
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
2086
1489
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);
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
2110
1495
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);
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
2122
1503
}
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){
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
2169
1511
perror_plus("asprintf");
2170
_exit(EX_OSERR);
2171
}
2172
ret = setenv("DELAY", delaystring, 1);
2173
if(ret == -1){
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
2174
1570
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;
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
2243
1582
} 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);
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
2263
1619
}
2264
1620
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;
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
2270
1627
struct ifreq network;
2271
1628
unsigned int if_index = if_nametoindex(interface);
2272
1629
if(if_index == 0){
2281
1638
}
2282
1639
2283
1640
if(not interface_is_up(interface)){
2284
int ret_errno = 0;
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
1641
if(not get_flags(interface, &network) and debug){
2287
1642
ret_errno = errno;
2288
1643
fprintf_plus(stderr, "Failed to get flags for interface "
2289
1644
"\"%s\"\n", interface);
2290
errno = old_errno;
2291
1645
return ret_errno;
2292
1646
}
2293
network.ifr_flags |= IFF_UP; /* set flag */
1647
network.ifr_flags |= IFF_UP;
2294
1648
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2296
if(sd == -1){
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
2297
1651
ret_errno = errno;
2298
1652
perror_plus("socket");
2299
1653
errno = old_errno;
2300
1654
return ret_errno;
2301
1655
}
2302
1656
2303
1657
if(quit_now){
2304
ret = close(sd);
2305
if(ret == -1){
2306
perror_plus("close");
2307
}
1658
close(sd);
2308
1659
errno = old_errno;
2309
1660
return EINTR;
2310
1661
}
2314
1665
interface);
2315
1666
}
2316
1667
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
}
1668
/* Raise priviliges */
1669
raise_privileges();
2323
1670
2324
1671
#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
}
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
2336
1679
}
2337
1680
#endif /* __linux__ */
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
2340
1683
#ifdef __linux__
2341
1684
if(restore_loglevel){
2342
1685
ret_linux = klogctl(7, NULL, 0);
2346
1689
}
2347
1690
#endif /* __linux__ */
2348
1691
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
}
1692
/* Lower privileges */
1693
lower_privileges();
2358
1694
2359
1695
/* Close the socket */
2360
ret = close(sd);
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2361
1697
if(ret == -1){
2362
1698
perror_plus("close");
2363
1699
}
2364
1700
2365
1701
if(ret_setflags == -1){
2366
errno = ioctl_errno;
1702
errno = ret_errno;
2367
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2368
1704
errno = old_errno;
2369
return ioctl_errno;
1705
return ret_errno;
2370
1706
}
2371
1707
} else if(debug){
2372
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2375
1711
2376
1712
/* Sleep checking until interface is running.
2377
1713
Check every 0.25s, up to total time of delay */
2378
for(int i = 0; i < delay * 4; i++){
1714
for(int i=0; i < delay * 4; i++){
2379
1715
if(interface_is_running(interface)){
2380
1716
break;
2381
1717
}
2390
1726
return 0;
2391
1727
}
2392
1728
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
2396
1734
struct ifreq network;
2397
1735
unsigned int if_index = if_nametoindex(interface);
2398
1736
if(if_index == 0){
2401
1739
return ENXIO;
2402
1740
}
2403
1741
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
2406
1742
if(not get_flags(interface, &network) and debug){
2407
1743
ret_errno = errno;
2408
1744
fprintf_plus(stderr, "Failed to get flags for interface "
2409
1745
"\"%s\"\n", interface);
2410
errno = old_errno;
2411
1746
return ret_errno;
2412
1747
}
2413
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2414
1749
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2416
if(sd == -1){
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
2417
1752
ret_errno = errno;
2418
1753
perror_plus("socket");
2419
1754
errno = old_errno;
2425
1760
interface);
2426
1761
}
2427
1762
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
}
2434
2435
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
2437
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
}
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
2447
1771
2448
1772
/* Close the socket */
2449
int ret = close(sd);
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2450
1774
if(ret == -1){
2451
1775
perror_plus("close");
2452
1776
}
2453
1777
2454
1778
if(ret_setflags == -1){
2455
errno = ioctl_errno;
1779
errno = ret_errno;
2456
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2457
1781
errno = old_errno;
2458
return ioctl_errno;
1782
return ret_errno;
2459
1783
}
2460
1784
} else if(debug){
2461
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2467
1791
}
2468
1792
2469
1793
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 };
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
2483
1798
AvahiSServiceBrowser *sb = NULL;
2484
1799
error_t ret_errno;
2485
1800
int ret;
2488
1803
int exitcode = EXIT_SUCCESS;
2489
1804
char *interfaces_to_take_down = NULL;
2490
1805
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;
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1807
bool tempdir_created = false;
2494
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2495
1809
const char *seckey = PATHDIR "/" SECKEY;
2496
1810
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
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
2503
1813
2504
1814
bool gnutls_initialized = false;
2505
1815
bool gpgme_initialized = false;
2551
1861
{ .name = "pubkey", .key = 'p',
2552
1862
.arg = "FILE",
2553
1863
.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 },
1864
.group = 2 },
2571
1865
{ .name = "dh-bits", .key = 129,
2572
1866
.arg = "BITS",
2573
1867
.doc = "Bit length of the prime number used in the"
2574
1868
" Diffie-Hellman key exchange",
2575
1869
.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
1870
{ .name = "priority", .key = 130,
2582
1871
.arg = "STRING",
2583
1872
.doc = "GnuTLS priority string for the TLS handshake",
2629
1918
case 'p': /* --pubkey */
2630
1919
pubkey = arg;
2631
1920
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
1921
case 129: /* --dh-bits */
2643
1922
errno = 0;
2644
1923
tmpmax = strtoimax(arg, &tmp, 10);
2648
1927
}
2649
1928
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2650
1929
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
2654
1930
case 130: /* --priority */
2655
1931
mc.priority = arg;
2656
1932
break;
2679
1955
argp_state_help(state, state->out_stream,
2680
1956
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2681
1957
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
2683
1958
case -3: /* --usage */
2684
1959
argp_state_help(state, state->out_stream,
2685
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
2687
1961
case 'V': /* --version */
2688
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2689
1963
exit(argp_err_exit_status);
2698
1972
.args_doc = "",
2699
1973
.doc = "Mandos client -- Get and decrypt"
2700
1974
" 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){
1975
ret = argp_parse(&argp, argc, argv,
1976
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1977
switch(ret){
2704
1978
case 0:
2705
1979
break;
2706
1980
case ENOMEM:
2707
1981
default:
2708
errno = ret_errno;
1982
errno = ret;
2709
1983
perror_plus("argp_parse");
2710
1984
exitcode = EX_OSERR;
2711
1985
goto end;
2714
1988
goto end;
2715
1989
}
2716
1990
}
2717
1991
2718
1992
{
2719
1993
/* Work around Debian bug #633582:
2720
<https://bugs.debian.org/633582> */
1994
<http://bugs.debian.org/633582> */
2721
1995
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2724
if(ret != 0){
2725
errno = ret;
2726
perror_plus("Failed to raise privileges");
2727
} else {
1996
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
2728
1998
struct stat st;
2729
1999
2730
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2744
2014
}
2745
2015
}
2746
2016
}
2747
close(seckey_fd);
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2748
2018
}
2749
2019
}
2750
2020
2751
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2752
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2753
2023
if(pubkey_fd == -1){
2765
2035
}
2766
2036
}
2767
2037
}
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
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2794
2042
/* Lower privileges */
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2798
perror_plus("Failed to lower privileges");
2799
}
2043
lower_privileges();
2800
2044
}
2801
2045
}
2802
2046
2826
2070
goto end;
2827
2071
}
2828
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2829
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2830
}
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
2833
2081
}
2834
2082
2835
2083
if(not debug){
2913
2161
2914
2162
/* If no interfaces were specified, make a list */
2915
2163
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2164
struct dirent **direntries;
2917
2165
/* Look for any good interfaces */
2918
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2919
2167
alphasort);
2923
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2924
2172
direntries[i]->d_name);
2925
2173
if(ret_errno != 0){
2926
errno = ret_errno;
2927
2174
perror_plus("argz_add");
2928
free(direntries[i]);
2929
2175
continue;
2930
2176
}
2931
2177
if(debug){
2932
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2933
2179
direntries[i]->d_name);
2934
2180
}
2935
free(direntries[i]);
2936
2181
}
2937
2182
free(direntries);
2938
2183
} else {
2939
if(ret == 0){
2940
free(direntries);
2941
}
2184
free(direntries);
2942
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2943
2186
exitcode = EXIT_FAILURE;
2944
2187
goto end;
2967
2210
break;
2968
2211
}
2969
2212
bool interface_was_up = interface_is_up(interface);
2970
errno = bring_up_interface(interface, delay);
2213
ret = bring_up_interface(interface, delay);
2971
2214
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));
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2975
2218
} else {
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2978
interface);
2979
if(errno != 0){
2980
perror_plus("argz_add");
2981
}
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2982
2222
}
2983
2223
}
2984
2224
}
3000
2240
goto end;
3001
2241
}
3002
2242
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
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
3010
2244
if(ret == -1){
3011
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
3012
2246
exitcode = EX_UNAVAILABLE;
3019
2253
goto end;
3020
2254
}
3021
2255
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){
2256
if(mkdtemp(tempdir) == NULL){
3032
2257
perror_plus("mkdtemp");
3033
2258
goto end;
3034
2259
}
2260
tempdir_created = true;
3035
2261
3036
2262
if(quit_now){
3037
2263
goto end;
3112
2338
sleep((unsigned int)retry_interval);
3113
2339
}
3114
2340
3115
if(not quit_now){
2341
if (not quit_now){
3116
2342
exitcode = EXIT_SUCCESS;
3117
2343
}
3118
2344
3134
2360
3135
2361
/* Allocate a new server */
3136
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3137
&config, NULL, NULL, &ret);
2363
&config, NULL, NULL, &ret_errno);
3138
2364
3139
2365
/* Free the Avahi configuration data */
3140
2366
avahi_server_config_free(&config);
3143
2369
/* Check if creating the Avahi server object succeeded */
3144
2370
if(mc.server == NULL){
3145
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3146
avahi_strerror(ret));
2372
avahi_strerror(ret_errno));
3147
2373
exitcode = EX_UNAVAILABLE;
3148
2374
goto end;
3149
2375
}
3173
2399
if(debug){
3174
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
3175
2401
}
3176
2402
3177
2403
ret = avahi_loop_with_timeout(simple_poll,
3178
2404
(int)(retry_interval * 1000), &mc);
3179
2405
if(debug){
3184
2410
end:
3185
2411
3186
2412
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
}
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3194
2414
}
3195
2415
3196
2416
/* Cleanup things */
3207
2427
3208
2428
if(gnutls_initialized){
3209
2429
gnutls_certificate_free_credentials(mc.cred);
2430
gnutls_global_deinit();
3210
2431
gnutls_dh_params_deinit(mc.dh_params);
3211
2432
}
3212
2433
3220
2441
mc.current_server->prev->next = NULL;
3221
2442
while(mc.current_server != NULL){
3222
2443
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
2444
free(mc.current_server);
3232
2445
mc.current_server = next;
3233
2446
}
3234
2447
}
3235
2448
3236
/* Re-raise privileges */
2449
/* Re-raise priviliges */
3237
2450
{
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
}
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
2467
}
2468
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
2472
}
2473
}
2474
2475
lower_privileges_permanently();
3272
2476
}
3273
2477
3274
2478
free(interfaces_to_take_down);
3275
2479
free(interfaces_hooks);
3276
2480
3277
void clean_dir_at(int base, const char * const dirname,
3278
uintmax_t level){
2481
/* Removes the GPGME temp directory and all files inside */
2482
if(tempdir_created){
3279
2483
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){
2484
struct dirent *direntry = NULL;
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
3293
2488
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);
2489
direntry = direntries[i];
2490
char *fullname = NULL;
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
direntry->d_name);
2493
if(ret < 0){
2494
perror_plus("asprintf");
2495
continue;
2496
}
2497
ret = remove(fullname);
2498
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2501
}
2502
free(fullname);
2503
}
2504
}
2505
2506
/* need to clean even if 0 because man page doesn't specify */
2507
free(direntries);
2508
if (numentries == -1){
2509
perror_plus("scandir");
2510
}
2511
ret = rmdir(tempdir);
2512
if(ret == -1 and errno != ENOENT){
2513
perror_plus("rmdir");
2514
}
3334
2515
}
3335
2516
3336
2517
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0