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- Committer: Teddy Hogeborn
- Date: 2012-06-17 12:23:31 UTC
- Revision ID: teddy@recompile.se-20120617122331-2drpu9t1jnmxzdhs
* plugins.d/mandos-client.c: Comment changes
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
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);
206
187
207
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
189
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
191
}
211
192
212
193
/*
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
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
_exit(EX_NOPERM);
1085
}
1086
}
1087
ret = dup2(devnull, STDIN_FILENO);
1088
if(ret == -1){
1089
perror_plus("dup2(devnull, STDIN_FILENO)");
1090
_exit(EX_OSERR);
1091
}
1092
ret = close(devnull);
1093
if(ret == -1){
1094
perror_plus("close");
1095
_exit(EX_OSERR);
1096
}
1097
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1098
if(ret == -1){
1099
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1100
_exit(EX_OSERR);
1101
}
1102
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1103
O_RDONLY
1104
| O_DIRECTORY
1105
| O_PATH
1106
| O_CLOEXEC));
1107
if(helperdir_fd == -1){
1108
perror_plus("open");
1109
_exit(EX_UNAVAILABLE);
1110
}
1111
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1112
helper, O_RDONLY));
1113
if(helper_fd == -1){
1114
perror_plus("openat");
1115
close(helperdir_fd);
1116
_exit(EX_UNAVAILABLE);
1117
}
1118
close(helperdir_fd);
1119
#ifdef __GNUC__
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wcast-qual"
1122
#endif
1123
if(fexecve(helper_fd, (char *const [])
1124
{ helper, add ? add_arg : delete_arg, (char *)address,
1125
interface, debug ? debug_flag : NULL, NULL },
1126
environ) == -1){
1127
#ifdef __GNUC__
1128
#pragma GCC diagnostic pop
1129
#endif
1130
perror_plus("fexecve");
1131
_exit(EXIT_FAILURE);
1132
}
1133
}
1134
if(pid == -1){
1135
perror_plus("fork");
1136
return false;
1137
}
1138
int status;
1139
pid_t pret = -1;
1140
errno = 0;
1141
do {
1142
pret = waitpid(pid, &status, 0);
1143
if(pret == -1 and errno == EINTR and quit_now){
1144
int errno_raising = 0;
1145
if((errno = raise_privileges()) != 0){
1146
errno_raising = errno;
1147
perror_plus("Failed to raise privileges in order to"
1148
" kill helper program");
1149
}
1150
if(kill(pid, SIGTERM) == -1){
1151
perror_plus("kill");
1152
}
1153
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1154
perror_plus("Failed to lower privileges after killing"
1155
" helper program");
1156
}
1157
return false;
1158
}
1159
} while(pret == -1 and errno == EINTR);
1160
if(pret == -1){
1161
perror_plus("waitpid");
1162
return false;
1163
}
1164
if(WIFEXITED(status)){
1165
if(WEXITSTATUS(status) != 0){
1166
fprintf_plus(stderr, "Error: iprouteadddel exited"
1167
" with status %d\n", WEXITSTATUS(status));
1168
return false;
1169
}
1170
return true;
1171
}
1172
if(WIFSIGNALED(status)){
1173
fprintf_plus(stderr, "Error: iprouteadddel died by"
1174
" signal %d\n", WTERMSIG(status));
1175
return false;
1176
}
1177
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1178
return false;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
static bool add_local_route(const char *address,
1183
AvahiIfIndex if_index){
1184
if(debug){
1185
fprintf_plus(stderr, "Adding route to %s\n", address);
1186
}
1187
return add_delete_local_route(true, address, if_index);
1188
}
1189
1190
__attribute__((nonnull, warn_unused_result))
1191
static bool delete_local_route(const char *address,
1192
AvahiIfIndex if_index){
1193
if(debug){
1194
fprintf_plus(stderr, "Removing route to %s\n", address);
1195
}
1196
return add_delete_local_route(false, address, if_index);
1197
}
1198
1199
623
/* Called when a Mandos server is found */
1200
__attribute__((nonnull, warn_unused_result))
1201
624
static int start_mandos_communication(const char *ip, in_port_t port,
1202
625
AvahiIfIndex if_index,
1203
626
int af, mandos_context *mc){
1204
627
int ret, tcp_sd = -1;
1205
628
ssize_t sret;
1206
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1207
633
char *buffer = NULL;
1208
634
char *decrypted_buffer = NULL;
1209
635
size_t buffer_length = 0;
1212
638
int retval = -1;
1213
639
gnutls_session_t session;
1214
640
int pf; /* Protocol family */
1215
bool route_added = false;
1216
641
1217
642
errno = 0;
1218
643
1240
665
bool match = false;
1241
666
{
1242
667
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
1246
670
if(if_nametoindex(interface) == (unsigned int)if_index){
1247
671
match = true;
1248
672
break;
1277
701
PRIuMAX "\n", ip, (uintmax_t)port);
1278
702
}
1279
703
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
1281
705
if(tcp_sd < 0){
1282
706
int e = errno;
1283
707
perror_plus("socket");
1290
714
goto mandos_end;
1291
715
}
1292
716
717
memset(&to, 0, sizeof(to));
1293
718
if(af == AF_INET6){
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
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);
1297
721
} else { /* IPv4 */
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
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);
1301
724
}
1302
725
if(ret < 0 ){
1303
726
int e = errno;
1312
735
goto mandos_end;
1313
736
}
1314
737
if(af == AF_INET6){
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1316
if(IN6_IS_ADDR_LINKLOCAL
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
1318
742
if(if_index == AVAHI_IF_UNSPEC){
1319
743
fprintf_plus(stderr, "An IPv6 link-local address is"
1320
744
" incomplete without a network interface\n");
1322
746
goto mandos_end;
1323
747
}
1324
748
/* Set the network interface number as scope */
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
1326
750
}
1327
751
} else {
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
753
-Wconversion and
754
-Wunreachable-code */
1329
755
}
1330
756
1331
757
if(quit_now){
1348
774
}
1349
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1350
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1351
if(af == AF_INET6){
1352
ret = getnameinfo((struct sockaddr *)&to,
1353
sizeof(struct sockaddr_in6),
1354
addrstr, sizeof(addrstr), NULL, 0,
1355
NI_NUMERICHOST);
1356
} else {
1357
ret = getnameinfo((struct sockaddr *)&to,
1358
sizeof(struct sockaddr_in),
1359
addrstr, sizeof(addrstr), NULL, 0,
1360
NI_NUMERICHOST);
1361
}
1362
if(ret == EAI_SYSTEM){
1363
perror_plus("getnameinfo");
1364
} else if(ret != 0) {
1365
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1366
} else if(strcmp(addrstr, ip) != 0){
1367
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1368
}
1369
}
1370
1371
if(quit_now){
1372
errno = EINTR;
1373
goto mandos_end;
1374
}
1375
1376
while(true){
1377
if(af == AF_INET6){
1378
ret = connect(tcp_sd, (struct sockaddr *)&to,
1379
sizeof(struct sockaddr_in6));
1380
} else {
1381
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1382
sizeof(struct sockaddr_in));
1383
}
1384
if(ret < 0){
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1386
and if_index != AVAHI_IF_UNSPEC
1387
and connect_to == NULL
1388
and not route_added and
1389
((af == AF_INET6 and not
1390
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1391
&to)->sin6_addr)))
1392
or (af == AF_INET and
1393
/* Not a a IPv4LL address */
1394
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1395
& 0xFFFF0000L) != 0xA9FE0000L))){
1396
/* Work around Avahi bug - Avahi does not announce link-local
1397
addresses if it has a global address, so local hosts with
1398
*only* a link-local address (e.g. Mandos clients) cannot
1399
connect to a Mandos server announced by Avahi on a server
1400
host with a global address. Work around this by retrying
1401
with an explicit route added with the server's address.
1402
1403
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
https://bugs.debian.org/587961
1406
*/
1407
if(debug){
1408
fprintf_plus(stderr, "Mandos server unreachable, trying"
1409
" direct route\n");
1410
}
1411
int e = errno;
1412
route_added = add_local_route(ip, if_index);
1413
if(route_added){
1414
continue;
1415
}
1416
errno = e;
1417
}
1418
if(errno != ECONNREFUSED or debug){
1419
int e = errno;
1420
perror_plus("connect");
1421
errno = e;
1422
}
1423
goto mandos_end;
1424
}
1425
1426
if(quit_now){
1427
errno = EINTR;
1428
goto mandos_end;
1429
}
1430
break;
777
const char *pcret;
778
if(af == AF_INET6){
779
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
780
sizeof(addrstr));
781
} else {
782
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
783
sizeof(addrstr));
784
}
785
if(pcret == NULL){
786
perror_plus("inet_ntop");
787
} else {
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
790
}
791
}
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
798
799
if(af == AF_INET6){
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
801
} else {
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
803
}
804
if(ret < 0){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
806
int e = errno;
807
perror_plus("connect");
808
errno = e;
809
}
810
goto mandos_end;
811
}
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
1431
816
}
1432
817
1433
818
const char *out = mandos_protocol_version;
1587
972
&decrypted_buffer, mc);
1588
973
if(decrypted_buffer_size >= 0){
1589
974
1590
clearerr(stdout);
1591
975
written = 0;
1592
976
while(written < (size_t) decrypted_buffer_size){
1593
977
if(quit_now){
1609
993
}
1610
994
written += (size_t)ret;
1611
995
}
1612
ret = fflush(stdout);
1613
if(ret != 0){
1614
int e = errno;
1615
if(debug){
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1617
strerror(errno));
1618
}
1619
errno = e;
1620
goto mandos_end;
1621
}
1622
996
retval = 0;
1623
997
}
1624
998
}
1627
1001
1628
1002
mandos_end:
1629
1003
{
1630
if(route_added){
1631
if(not delete_local_route(ip, if_index)){
1632
fprintf_plus(stderr, "Failed to delete local route to %s on"
1633
" interface %d", ip, if_index);
1634
}
1635
}
1636
1004
int e = errno;
1637
1005
free(decrypted_buffer);
1638
1006
free(buffer);
1639
1007
if(tcp_sd >= 0){
1640
ret = close(tcp_sd);
1008
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1641
1009
}
1642
1010
if(ret == -1){
1643
1011
if(e == 0){
1668
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1669
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1670
1038
flags,
1671
void *mc){
1039
void* mc){
1672
1040
if(r == NULL){
1673
1041
return;
1674
1042
}
1677
1045
timed out */
1678
1046
1679
1047
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1681
1048
return;
1682
1049
}
1683
1050
1728
1095
const char *domain,
1729
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1730
1097
flags,
1731
void *mc){
1098
void* mc){
1732
1099
if(b == NULL){
1733
1100
return;
1734
1101
}
1794
1161
errno = old_errno;
1795
1162
}
1796
1163
1797
__attribute__((nonnull, warn_unused_result))
1798
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
1165
int ret;
1800
int old_errno;
1166
error_t ret_errno;
1801
1167
1802
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
1169
if(s < 0){
1804
old_errno = errno;
1170
ret_errno = errno;
1805
1171
perror_plus("socket");
1806
errno = old_errno;
1172
errno = ret_errno;
1807
1173
return false;
1808
1174
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1175
strcpy(ifr->ifr_name, ifname);
1811
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
1177
if(ret == -1){
1813
1178
if(debug){
1814
old_errno = errno;
1179
ret_errno = errno;
1815
1180
perror_plus("ioctl SIOCGIFFLAGS");
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1181
errno = ret_errno;
1822
1182
}
1823
1183
return false;
1824
1184
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
1185
return true;
1831
1186
}
1832
1187
1833
__attribute__((nonnull, warn_unused_result))
1834
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1835
1189
1836
1190
/* Reject the loopback device */
1878
1232
* corresponds to an acceptable network device.
1879
1233
* (This function is passed to scandir(3) as a filter function.)
1880
1234
*/
1881
__attribute__((nonnull, warn_unused_result))
1882
1235
int good_interface(const struct dirent *if_entry){
1883
1236
if(if_entry->d_name[0] == '.'){
1884
1237
return 0;
1902
1255
/*
1903
1256
* This function determines if a network interface is up.
1904
1257
*/
1905
__attribute__((nonnull, warn_unused_result))
1906
1258
bool interface_is_up(const char *interface){
1907
1259
struct ifreq ifr;
1908
1260
if(not get_flags(interface, &ifr)){
1919
1271
/*
1920
1272
* This function determines if a network interface is running
1921
1273
*/
1922
__attribute__((nonnull, warn_unused_result))
1923
1274
bool interface_is_running(const char *interface){
1924
1275
struct ifreq ifr;
1925
1276
if(not get_flags(interface, &ifr)){
1933
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1934
1285
}
1935
1286
1936
__attribute__((nonnull, pure, warn_unused_result))
1937
1287
int notdotentries(const struct dirent *direntry){
1938
1288
/* Skip "." and ".." */
1939
1289
if(direntry->d_name[0] == '.'
1946
1296
}
1947
1297
1948
1298
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1950
1299
int runnable_hook(const struct dirent *direntry){
1951
1300
int ret;
1952
1301
size_t sret;
1960
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1961
1310
"abcdefghijklmnopqrstuvwxyz"
1962
1311
"0123456789"
1963
"_.-");
1312
"_-");
1964
1313
if((direntry->d_name)[sret] != '\0'){
1965
1314
/* Contains non-allowed characters */
1966
1315
if(debug){
1970
1319
return 0;
1971
1320
}
1972
1321
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1974
1330
if(ret == -1){
1975
1331
if(debug){
1976
1332
perror_plus("Could not stat hook");
2000
1356
return 1;
2001
1357
}
2002
1358
2003
__attribute__((nonnull, warn_unused_result))
2004
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2005
1360
mandos_context *mc){
2006
1361
int ret;
2010
1365
2011
1366
while(true){
2012
1367
if(mc->current_server == NULL){
2013
if(debug){
1368
if (debug){
2014
1369
fprintf_plus(stderr, "Wait until first server is found."
2015
1370
" No timeout!\n");
2016
1371
}
2017
1372
ret = avahi_simple_poll_iterate(s, -1);
2018
1373
} else {
2019
if(debug){
1374
if (debug){
2020
1375
fprintf_plus(stderr, "Check current_server if we should run"
2021
1376
" it, or wait\n");
2022
1377
}
2039
1394
- ((intmax_t)waited_time.tv_sec * 1000))
2040
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
2041
1396
2042
if(debug){
1397
if (debug){
2043
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2044
1399
block_time);
2045
1400
}
2067
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
2068
1423
}
2069
1424
if(ret != 0){
2070
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
2071
1426
return (ret != 1) ? ret : 0;
2072
1427
}
2073
1428
}
2074
1429
}
2075
1430
}
2076
1431
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
2079
1485
const float delay){
2080
struct dirent **direntries = NULL;
2081
if(hookdir_fd == -1){
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2083
| O_CLOEXEC);
2084
if(hookdir_fd == -1){
2085
if(errno == ENOENT){
2086
if(debug){
2087
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2088
" found\n", hookdir);
2089
}
2090
} else {
2091
perror_plus("open");
2092
}
2093
return;
2094
}
2095
}
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
runnable_hook, alphasort);
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
2103
1491
if(numhooks == -1){
2104
perror_plus("scandir");
2105
close(devnull);
2106
return;
2107
}
2108
struct dirent *direntry;
2109
int ret;
2110
for(int i = 0; i < numhooks; i++){
2111
direntry = direntries[i];
2112
if(debug){
2113
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2114
direntry->d_name);
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
2115
1499
}
2116
pid_t hook_pid = fork();
2117
if(hook_pid == 0){
2118
/* Child */
2119
/* Raise privileges */
2120
errno = raise_privileges_permanently();
2121
if(errno != 0){
2122
perror_plus("Failed to raise privileges");
2123
_exit(EX_NOPERM);
2124
}
2125
/* Set group */
2126
errno = 0;
2127
ret = setgid(0);
2128
if(ret == -1){
2129
perror_plus("setgid");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Reset supplementary groups */
2133
errno = 0;
2134
ret = setgroups(0, NULL);
2135
if(ret == -1){
2136
perror_plus("setgroups");
2137
_exit(EX_NOPERM);
2138
}
2139
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
ret = setenv("DEVICE", interface, 1);
2145
if(ret == -1){
2146
perror_plus("setenv");
2147
_exit(EX_OSERR);
2148
}
2149
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2150
if(ret == -1){
2151
perror_plus("setenv");
2152
_exit(EX_OSERR);
2153
}
2154
ret = setenv("MODE", mode, 1);
2155
if(ret == -1){
2156
perror_plus("setenv");
2157
_exit(EX_OSERR);
2158
}
2159
char *delaystring;
2160
ret = asprintf(&delaystring, "%f", (double)delay);
2161
if(ret == -1){
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
2162
1507
perror_plus("asprintf");
2163
_exit(EX_OSERR);
2164
}
2165
ret = setenv("DELAY", delaystring, 1);
2166
if(ret == -1){
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
2167
1566
free(delaystring);
2168
perror_plus("setenv");
2169
_exit(EX_OSERR);
2170
}
2171
free(delaystring);
2172
if(connect_to != NULL){
2173
ret = setenv("CONNECT", connect_to, 1);
2174
if(ret == -1){
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
}
2179
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2180
direntry->d_name,
2181
O_RDONLY));
2182
if(hook_fd == -1){
2183
perror_plus("openat");
2184
_exit(EXIT_FAILURE);
2185
}
2186
if(close(hookdir_fd) == -1){
2187
perror_plus("close");
2188
_exit(EXIT_FAILURE);
2189
}
2190
ret = dup2(devnull, STDIN_FILENO);
2191
if(ret == -1){
2192
perror_plus("dup2(devnull, STDIN_FILENO)");
2193
_exit(EX_OSERR);
2194
}
2195
ret = close(devnull);
2196
if(ret == -1){
2197
perror_plus("close");
2198
_exit(EX_OSERR);
2199
}
2200
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2201
if(ret == -1){
2202
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2203
_exit(EX_OSERR);
2204
}
2205
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2206
environ) == -1){
2207
perror_plus("fexecve");
2208
_exit(EXIT_FAILURE);
2209
}
2210
} else {
2211
if(hook_pid == -1){
2212
perror_plus("fork");
2213
free(direntry);
2214
continue;
2215
}
2216
int status;
2217
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2218
perror_plus("waitpid");
2219
free(direntry);
2220
continue;
2221
}
2222
if(WIFEXITED(status)){
2223
if(WEXITSTATUS(status) != 0){
2224
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2225
" with status %d\n", direntry->d_name,
2226
WEXITSTATUS(status));
2227
free(direntry);
2228
continue;
2229
}
2230
} else if(WIFSIGNALED(status)){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2232
" signal %d\n", direntry->d_name,
2233
WTERMSIG(status));
2234
free(direntry);
2235
continue;
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
2236
1578
} else {
2237
fprintf_plus(stderr, "Warning: network hook \"%s\""
2238
" crashed\n", direntry->d_name);
2239
free(direntry);
2240
continue;
2241
}
2242
}
2243
if(debug){
2244
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2245
direntry->d_name);
2246
}
2247
free(direntry);
2248
}
2249
free(direntries);
2250
if(close(hookdir_fd) == -1){
2251
perror_plus("close");
2252
} else {
2253
hookdir_fd = -1;
2254
}
2255
close(devnull);
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
2256
1615
}
2257
1616
2258
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2262
int ret;
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
2263
1623
struct ifreq network;
2264
1624
unsigned int if_index = if_nametoindex(interface);
2265
1625
if(if_index == 0){
2274
1634
}
2275
1635
2276
1636
if(not interface_is_up(interface)){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2279
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
2280
1638
ret_errno = errno;
2281
1639
fprintf_plus(stderr, "Failed to get flags for interface "
2282
1640
"\"%s\"\n", interface);
2283
errno = old_errno;
2284
1641
return ret_errno;
2285
1642
}
2286
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
2287
1644
2288
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2289
if(sd == -1){
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
2290
1647
ret_errno = errno;
2291
1648
perror_plus("socket");
2292
1649
errno = old_errno;
2293
1650
return ret_errno;
2294
1651
}
2295
1652
2296
1653
if(quit_now){
2297
ret = close(sd);
2298
if(ret == -1){
2299
perror_plus("close");
2300
}
1654
close(sd);
2301
1655
errno = old_errno;
2302
1656
return EINTR;
2303
1657
}
2307
1661
interface);
2308
1662
}
2309
1663
2310
/* Raise privileges */
2311
ret_errno = raise_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to raise privileges");
2315
}
1664
/* Raise priviliges */
1665
raise_privileges();
2316
1666
2317
1667
#ifdef __linux__
2318
int ret_linux;
2319
bool restore_loglevel = false;
2320
if(ret_errno == 0){
2321
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2322
messages about the network interface to mess up the prompt */
2323
ret_linux = klogctl(8, NULL, 5);
2324
if(ret_linux == -1){
2325
perror_plus("klogctl");
2326
} else {
2327
restore_loglevel = true;
2328
}
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
2329
1675
}
2330
1676
#endif /* __linux__ */
2331
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2332
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
2333
1679
#ifdef __linux__
2334
1680
if(restore_loglevel){
2335
1681
ret_linux = klogctl(7, NULL, 0);
2339
1685
}
2340
1686
#endif /* __linux__ */
2341
1687
2342
/* If raise_privileges() succeeded above */
2343
if(ret_errno == 0){
2344
/* Lower privileges */
2345
ret_errno = lower_privileges();
2346
if(ret_errno != 0){
2347
errno = ret_errno;
2348
perror_plus("Failed to lower privileges");
2349
}
2350
}
1688
/* Lower privileges */
1689
lower_privileges();
2351
1690
2352
1691
/* Close the socket */
2353
ret = close(sd);
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2354
1693
if(ret == -1){
2355
1694
perror_plus("close");
2356
1695
}
2357
1696
2358
1697
if(ret_setflags == -1){
2359
errno = ioctl_errno;
1698
errno = ret_errno;
2360
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2361
1700
errno = old_errno;
2362
return ioctl_errno;
1701
return ret_errno;
2363
1702
}
2364
1703
} else if(debug){
2365
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2368
1707
2369
1708
/* Sleep checking until interface is running.
2370
1709
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
1710
for(int i=0; i < delay * 4; i++){
2372
1711
if(interface_is_running(interface)){
2373
1712
break;
2374
1713
}
2383
1722
return 0;
2384
1723
}
2385
1724
2386
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
2389
1730
struct ifreq network;
2390
1731
unsigned int if_index = if_nametoindex(interface);
2391
1732
if(if_index == 0){
2394
1735
return ENXIO;
2395
1736
}
2396
1737
if(interface_is_up(interface)){
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
2399
1738
if(not get_flags(interface, &network) and debug){
2400
1739
ret_errno = errno;
2401
1740
fprintf_plus(stderr, "Failed to get flags for interface "
2402
1741
"\"%s\"\n", interface);
2403
errno = old_errno;
2404
1742
return ret_errno;
2405
1743
}
2406
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2407
1745
2408
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2409
if(sd == -1){
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
2410
1748
ret_errno = errno;
2411
1749
perror_plus("socket");
2412
1750
errno = old_errno;
2418
1756
interface);
2419
1757
}
2420
1758
2421
/* Raise privileges */
2422
ret_errno = raise_privileges();
2423
if(ret_errno != 0){
2424
errno = ret_errno;
2425
perror_plus("Failed to raise privileges");
2426
}
2427
2428
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2429
ioctl_errno = errno;
2430
2431
/* If raise_privileges() succeeded above */
2432
if(ret_errno == 0){
2433
/* Lower privileges */
2434
ret_errno = lower_privileges();
2435
if(ret_errno != 0){
2436
errno = ret_errno;
2437
perror_plus("Failed to lower privileges");
2438
}
2439
}
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
2440
1767
2441
1768
/* Close the socket */
2442
int ret = close(sd);
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2443
1770
if(ret == -1){
2444
1771
perror_plus("close");
2445
1772
}
2446
1773
2447
1774
if(ret_setflags == -1){
2448
errno = ioctl_errno;
1775
errno = ret_errno;
2449
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2450
1777
errno = old_errno;
2451
return ioctl_errno;
1778
return ret_errno;
2452
1779
}
2453
1780
} else if(debug){
2454
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2460
1787
}
2461
1788
2462
1789
int main(int argc, char *argv[]){
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
2476
1794
AvahiSServiceBrowser *sb = NULL;
2477
1795
error_t ret_errno;
2478
1796
int ret;
2481
1799
int exitcode = EXIT_SUCCESS;
2482
1800
char *interfaces_to_take_down = NULL;
2483
1801
size_t interfaces_to_take_down_size = 0;
2484
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2485
char old_tempdir[] = "/tmp/mandosXXXXXX";
2486
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
2487
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
1805
const char *seckey = PATHDIR "/" SECKEY;
2489
1806
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2493
#endif
2494
const char *dh_params_file = NULL;
2495
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
2496
1809
2497
1810
bool gnutls_initialized = false;
2498
1811
bool gpgme_initialized = false;
2544
1857
{ .name = "pubkey", .key = 'p',
2545
1858
.arg = "FILE",
2546
1859
.doc = "OpenPGP public key file base name",
2547
.group = 1 },
2548
{ .name = "tls-privkey", .key = 't',
2549
.arg = "FILE",
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2552
#else
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2554
#endif
2555
.group = 1 },
2556
{ .name = "tls-pubkey", .key = 'T',
2557
.arg = "FILE",
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2560
#else
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
#endif
2563
.group = 1 },
1860
.group = 2 },
2564
1861
{ .name = "dh-bits", .key = 129,
2565
1862
.arg = "BITS",
2566
1863
.doc = "Bit length of the prime number used in the"
2567
1864
" Diffie-Hellman key exchange",
2568
1865
.group = 2 },
2569
{ .name = "dh-params", .key = 134,
2570
.arg = "FILE",
2571
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2572
" for the Diffie-Hellman key exchange",
2573
.group = 2 },
2574
1866
{ .name = "priority", .key = 130,
2575
1867
.arg = "STRING",
2576
1868
.doc = "GnuTLS priority string for the TLS handshake",
2622
1914
case 'p': /* --pubkey */
2623
1915
pubkey = arg;
2624
1916
break;
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2627
tls_privkey = arg;
2628
#endif
2629
break;
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2632
tls_pubkey = arg;
2633
#endif
2634
break;
2635
1917
case 129: /* --dh-bits */
2636
1918
errno = 0;
2637
1919
tmpmax = strtoimax(arg, &tmp, 10);
2641
1923
}
2642
1924
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2643
1925
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2647
1926
case 130: /* --priority */
2648
1927
mc.priority = arg;
2649
1928
break;
2672
1951
argp_state_help(state, state->out_stream,
2673
1952
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
1953
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2676
1954
case -3: /* --usage */
2677
1955
argp_state_help(state, state->out_stream,
2678
1956
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2680
1957
case 'V': /* --version */
2681
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2682
1959
exit(argp_err_exit_status);
2691
1968
.args_doc = "",
2692
1969
.doc = "Mandos client -- Get and decrypt"
2693
1970
" passwords from a Mandos server" };
2694
ret_errno = argp_parse(&argp, argc, argv,
2695
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2696
switch(ret_errno){
1971
ret = argp_parse(&argp, argc, argv,
1972
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1973
switch(ret){
2697
1974
case 0:
2698
1975
break;
2699
1976
case ENOMEM:
2700
1977
default:
2701
errno = ret_errno;
1978
errno = ret;
2702
1979
perror_plus("argp_parse");
2703
1980
exitcode = EX_OSERR;
2704
1981
goto end;
2707
1984
goto end;
2708
1985
}
2709
1986
}
2710
1987
2711
1988
{
2712
1989
/* Work around Debian bug #633582:
2713
<https://bugs.debian.org/633582> */
1990
<http://bugs.debian.org/633582> */
2714
1991
2715
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2719
perror_plus("Failed to raise privileges");
2720
} else {
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2721
1994
struct stat st;
2722
1995
2723
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2737
2010
}
2738
2011
}
2739
2012
}
2740
close(seckey_fd);
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2741
2014
}
2742
2015
}
2743
2016
2744
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2745
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2746
2019
if(pubkey_fd == -1){
2758
2031
}
2759
2032
}
2760
2033
}
2761
close(pubkey_fd);
2762
}
2763
}
2764
2765
if(dh_params_file != NULL
2766
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2767
int dhparams_fd = open(dh_params_file, O_RDONLY);
2768
if(dhparams_fd == -1){
2769
perror_plus("open");
2770
} else {
2771
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2772
if(ret == -1){
2773
perror_plus("fstat");
2774
} else {
2775
if(S_ISREG(st.st_mode)
2776
and st.st_uid == 0 and st.st_gid == 0){
2777
ret = fchown(dhparams_fd, uid, gid);
2778
if(ret == -1){
2779
perror_plus("fchown");
2780
}
2781
}
2782
}
2783
close(dhparams_fd);
2784
}
2785
}
2786
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2787
2038
/* Lower privileges */
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2791
perror_plus("Failed to lower privileges");
2792
}
2039
lower_privileges();
2793
2040
}
2794
2041
}
2795
2042
2819
2066
goto end;
2820
2067
}
2821
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2822
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2823
}
2824
run_network_hooks("start", interfaces_hooks != NULL ?
2825
interfaces_hooks : "", delay);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2826
2077
}
2827
2078
2828
2079
if(not debug){
2906
2157
2907
2158
/* If no interfaces were specified, make a list */
2908
2159
if(mc.interfaces == NULL){
2909
struct dirent **direntries = NULL;
2160
struct dirent **direntries;
2910
2161
/* Look for any good interfaces */
2911
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2912
2163
alphasort);
2916
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2917
2168
direntries[i]->d_name);
2918
2169
if(ret_errno != 0){
2919
errno = ret_errno;
2920
2170
perror_plus("argz_add");
2921
free(direntries[i]);
2922
2171
continue;
2923
2172
}
2924
2173
if(debug){
2925
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2926
2175
direntries[i]->d_name);
2927
2176
}
2928
free(direntries[i]);
2929
2177
}
2930
2178
free(direntries);
2931
2179
} else {
2932
if(ret == 0){
2933
free(direntries);
2934
}
2180
free(direntries);
2935
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2936
2182
exitcode = EXIT_FAILURE;
2937
2183
goto end;
2960
2206
break;
2961
2207
}
2962
2208
bool interface_was_up = interface_is_up(interface);
2963
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2964
2210
if(not interface_was_up){
2965
if(errno != 0){
2966
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2967
" %s\n", interface, strerror(errno));
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2968
2214
} else {
2969
errno = argz_add(&interfaces_to_take_down,
2970
&interfaces_to_take_down_size,
2971
interface);
2972
if(errno != 0){
2973
perror_plus("argz_add");
2974
}
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2975
2218
}
2976
2219
}
2977
2220
}
2993
2236
goto end;
2994
2237
}
2995
2238
2996
#if GNUTLS_VERSION_NUMBER >= 0x030606
2997
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2998
#elif GNUTLS_VERSION_NUMBER < 0x030600
2999
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3000
#else
3001
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3002
#endif
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
3003
2240
if(ret == -1){
3004
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
3005
2242
exitcode = EX_UNAVAILABLE;
3012
2249
goto end;
3013
2250
}
3014
2251
3015
/* Try /run/tmp before /tmp */
3016
tempdir = mkdtemp(run_tempdir);
3017
if(tempdir == NULL and errno == ENOENT){
3018
if(debug){
3019
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3020
run_tempdir, old_tempdir);
3021
}
3022
tempdir = mkdtemp(old_tempdir);
3023
}
3024
if(tempdir == NULL){
2252
if(mkdtemp(tempdir) == NULL){
3025
2253
perror_plus("mkdtemp");
3026
2254
goto end;
3027
2255
}
2256
tempdir_created = true;
3028
2257
3029
2258
if(quit_now){
3030
2259
goto end;
3102
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
3103
2332
(int)retry_interval);
3104
2333
}
3105
sleep((unsigned int)retry_interval);
2334
sleep((int)retry_interval);
3106
2335
}
3107
2336
3108
if(not quit_now){
2337
if (not quit_now){
3109
2338
exitcode = EXIT_SUCCESS;
3110
2339
}
3111
2340
3127
2356
3128
2357
/* Allocate a new server */
3129
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3130
&config, NULL, NULL, &ret);
2359
&config, NULL, NULL, &ret_errno);
3131
2360
3132
2361
/* Free the Avahi configuration data */
3133
2362
avahi_server_config_free(&config);
3136
2365
/* Check if creating the Avahi server object succeeded */
3137
2366
if(mc.server == NULL){
3138
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3139
avahi_strerror(ret));
2368
avahi_strerror(ret_errno));
3140
2369
exitcode = EX_UNAVAILABLE;
3141
2370
goto end;
3142
2371
}
3166
2395
if(debug){
3167
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
3168
2397
}
3169
2398
3170
2399
ret = avahi_loop_with_timeout(simple_poll,
3171
2400
(int)(retry_interval * 1000), &mc);
3172
2401
if(debug){
3177
2406
end:
3178
2407
3179
2408
if(debug){
3180
if(signal_received){
3181
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3182
argv[0], signal_received,
3183
strsignal(signal_received));
3184
} else {
3185
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3186
}
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
2410
}
3188
2411
3189
2412
/* Cleanup things */
3200
2423
3201
2424
if(gnutls_initialized){
3202
2425
gnutls_certificate_free_credentials(mc.cred);
2426
gnutls_global_deinit();
3203
2427
gnutls_dh_params_deinit(mc.dh_params);
3204
2428
}
3205
2429
3213
2437
mc.current_server->prev->next = NULL;
3214
2438
while(mc.current_server != NULL){
3215
2439
server *next = mc.current_server->next;
3216
#ifdef __GNUC__
3217
#pragma GCC diagnostic push
3218
#pragma GCC diagnostic ignored "-Wcast-qual"
3219
#endif
3220
free((char *)(mc.current_server->ip));
3221
#ifdef __GNUC__
3222
#pragma GCC diagnostic pop
3223
#endif
3224
2440
free(mc.current_server);
3225
2441
mc.current_server = next;
3226
2442
}
3227
2443
}
3228
2444
3229
/* Re-raise privileges */
2445
/* Re-raise priviliges */
3230
2446
{
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
3234
perror_plus("Failed to raise privileges");
3235
} else {
3236
3237
/* Run network hooks */
3238
run_network_hooks("stop", interfaces_hooks != NULL ?
3239
interfaces_hooks : "", delay);
3240
3241
/* Take down the network interfaces which were brought up */
3242
{
3243
char *interface = NULL;
3244
while((interface = argz_next(interfaces_to_take_down,
3245
interfaces_to_take_down_size,
3246
interface))){
3247
ret = take_down_interface(interface);
3248
if(ret != 0){
3249
errno = ret;
3250
perror_plus("Failed to take down interface");
3251
}
3252
}
3253
if(debug and (interfaces_to_take_down == NULL)){
3254
fprintf_plus(stderr, "No interfaces needed to be taken"
3255
" down\n");
3256
}
3257
}
3258
}
3259
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
3263
perror_plus("Failed to lower privileges permanently");
3264
}
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2463
}
2464
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2468
}
2469
}
2470
2471
lower_privileges_permanently();
3265
2472
}
3266
2473
3267
2474
free(interfaces_to_take_down);
3268
2475
free(interfaces_hooks);
3269
2476
3270
void clean_dir_at(int base, const char * const dirname,
3271
uintmax_t level){
2477
/* Removes the GPGME temp directory and all files inside */
2478
if(tempdir_created){
3272
2479
struct dirent **direntries = NULL;
3273
int dret;
3274
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3275
O_RDONLY
3276
| O_NOFOLLOW
3277
| O_DIRECTORY
3278
| O_PATH));
3279
if(dir_fd == -1){
3280
perror_plus("open");
3281
return;
3282
}
3283
int numentries = scandirat(dir_fd, ".", &direntries,
3284
notdotentries, alphasort);
3285
if(numentries >= 0){
2480
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
3286
2484
for(int i = 0; i < numentries; i++){
3287
if(debug){
3288
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3289
dirname, direntries[i]->d_name);
3290
}
3291
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3292
if(dret == -1){
3293
if(errno == EISDIR){
3294
dret = unlinkat(dir_fd, direntries[i]->d_name,
3295
AT_REMOVEDIR);
3296
}
3297
if((dret == -1) and (errno == ENOTEMPTY)
3298
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3299
== 0) and (level == 0)){
3300
/* Recurse only in this special case */
3301
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3302
dret = 0;
3303
}
3304
if((dret == -1) and (errno != ENOENT)){
3305
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3306
direntries[i]->d_name, strerror(errno));
3307
}
3308
}
3309
free(direntries[i]);
3310
}
3311
3312
/* need to clean even if 0 because man page doesn't specify */
3313
free(direntries);
3314
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3315
if(dret == -1 and errno != ENOENT){
3316
perror_plus("rmdir");
3317
}
3318
} else {
3319
perror_plus("scandirat");
3320
}
3321
close(dir_fd);
3322
}
3323
3324
/* Removes the GPGME temp directory and all files inside */
3325
if(tempdir != NULL){
3326
clean_dir_at(-1, tempdir, 0);
2485
direntry = direntries[i];
2486
char *fullname = NULL;
2487
ret = asprintf(&fullname, "%s/%s", tempdir,
2488
direntry->d_name);
2489
if(ret < 0){
2490
perror_plus("asprintf");
2491
continue;
2492
}
2493
ret = remove(fullname);
2494
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2497
}
2498
free(fullname);
2499
}
2500
}
2501
2502
/* need to clean even if 0 because man page doesn't specify */
2503
free(direntries);
2504
if (numentries == -1){
2505
perror_plus("scandir");
2506
}
2507
ret = rmdir(tempdir);
2508
if(ret == -1 and errno != ENOENT){
2509
perror_plus("rmdir");
2510
}
3327
2511
}
3328
2512
3329
2513
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0