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- Committer: Teddy Hogeborn
- Date: 2018-08-19 14:06:55 UTC
- Revision ID: teddy@recompile.se-20180819140655-ghsl0d4jsx8xwg44
Move UMASK setting to more proper place
* Makefile (install-client-nokey): Also install new conf files
"initramfs-tools-conf".
* debian/mandos-client.dirs: Add "usr/share/initramfs-tools/conf.d".
* initramfs-tools-conf: New file which sets UMASK.
* initramfs-tools-hook: Change comment to correctly state new location
of UMASK setting.
* initramfs-tools-hook-conf: Remove UMASK setting.
* Makefile (install-client-nokey): Also install new conf files
"initramfs-tools-conf".
* debian/mandos-client.dirs: Add "usr/share/initramfs-tools/conf.d".
* initramfs-tools-conf: New file which sets UMASK.
* initramfs-tools-hook: Change comment to correctly state new location
of UMASK setting.
* initramfs-tools-hook-conf: Remove UMASK setting.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
88
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
96
WEXITSTATUS(), WTERMSIG() */
90
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
91
104
92
105
#ifdef __linux__
93
106
#include <sys/klog.h> /* klogctl() */
135
148
static const char sys_class_net[] = "/sys/class/net";
136
149
char *connect_to = NULL;
137
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
138
154
139
155
/* Doubly linked list that need to be circularly linked when used */
140
156
typedef struct server{
141
157
const char *ip;
142
uint16_t port;
158
in_port_t port;
143
159
AvahiIfIndex if_index;
144
160
int af;
145
161
struct timespec last_seen;
149
165
150
166
/* Used for passing in values through the Avahi callback functions */
151
167
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
168
AvahiServer *server;
154
169
gnutls_certificate_credentials_t cred;
155
170
unsigned int dh_bits;
157
172
const char *priority;
158
173
gpgme_ctx_t ctx;
159
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
160
177
} mandos_context;
161
178
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
167
181
168
182
sig_atomic_t quit_now = 0;
169
183
int signal_received = 0;
177
191
perror(print_text);
178
192
}
179
193
180
__attribute__((format (gnu_printf, 2, 3)))
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
195
int fprintf_plus(FILE *stream, const char *format, ...){
182
196
va_list ap;
183
197
va_start (ap, format);
184
198
185
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
200
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
202
}
189
203
190
204
/*
192
206
* bytes. "buffer_capacity" is how much is currently allocated,
193
207
* "buffer_length" is how much is already used.
194
208
*/
209
__attribute__((nonnull, warn_unused_result))
195
210
size_t incbuffer(char **buffer, size_t buffer_length,
196
211
size_t buffer_capacity){
197
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
200
219
return 0;
201
220
}
221
*buffer = new_buf;
202
222
buffer_capacity += BUFFER_SIZE;
203
223
}
204
224
return buffer_capacity;
205
225
}
206
226
207
227
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
210
231
int ret;
211
232
server *new_server = malloc(sizeof(server));
212
233
if(new_server == NULL){
219
240
.af = af };
220
241
if(new_server->ip == NULL){
221
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
222
258
return false;
223
259
}
224
260
/* Special case of first server */
225
if (mc.current_server == NULL){
261
if(*current_server == NULL){
226
262
new_server->next = new_server;
227
263
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
264
*current_server = new_server;
230
265
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
233
269
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
270
(*current_server)->prev = new_server;
240
271
}
241
272
return true;
242
273
}
243
274
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
279
int ret = 0;
280
if(seteuid(0) == -1){
281
ret = errno;
282
}
283
errno = old_errno;
284
return ret;
285
}
286
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
292
if(ret != 0){
293
errno = old_errno;
294
return ret;
295
}
296
if(setuid(0) == -1){
297
ret = errno;
298
}
299
errno = old_errno;
300
return ret;
301
}
302
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
307
int ret = 0;
308
if(seteuid(uid) == -1){
309
ret = errno;
310
}
311
errno = old_errno;
312
return ret;
313
}
314
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
319
int ret = 0;
320
if(setuid(uid) == -1){
321
ret = errno;
322
}
323
errno = old_errno;
324
return ret;
325
}
326
244
327
/*
245
328
* Initialize GPGME.
246
329
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
330
__attribute__((nonnull, warn_unused_result))
331
static bool init_gpgme(const char * const seckey,
332
const char * const pubkey,
333
const char * const tempdir,
334
mandos_context *mc){
249
335
gpgme_error_t rc;
250
336
gpgme_engine_info_t engine_info;
251
337
252
253
338
/*
254
339
* Helper function to insert pub and seckey to the engine keyring.
255
340
*/
256
bool import_key(const char *filename){
341
bool import_key(const char * const filename){
257
342
int ret;
258
343
int fd;
259
344
gpgme_data_t pgp_data;
264
349
return false;
265
350
}
266
351
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
354
do {
355
{
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
358
struct tm tm;
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
361
break;
362
}
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
364
break;
365
}
366
if(debug){
367
fprintf_plus(stderr, "System clock is January 1970");
368
}
369
} else {
370
if(debug){
371
fprintf_plus(stderr, "System clock is invalid");
372
}
373
}
374
}
375
struct stat keystat;
376
ret = fstat(fd, &keystat);
377
if(ret != 0){
378
perror_plus("fstat");
379
break;
380
}
381
ret = raise_privileges();
382
if(ret != 0){
383
errno = ret;
384
perror_plus("Failed to raise privileges");
385
break;
386
}
387
if(debug){
388
fprintf_plus(stderr,
389
"Setting system clock to key file mtime");
390
}
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
394
}
395
ret = lower_privileges();
396
if(ret != 0){
397
errno = ret;
398
perror_plus("Failed to lower privileges");
399
}
400
} while(false);
401
267
402
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
403
if(rc != GPG_ERR_NO_ERROR){
269
404
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
271
406
return false;
272
407
}
273
408
274
rc = gpgme_op_import(mc.ctx, pgp_data);
409
rc = gpgme_op_import(mc->ctx, pgp_data);
275
410
if(rc != GPG_ERR_NO_ERROR){
276
411
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
412
gpgme_strsource(rc), gpgme_strerror(rc));
278
413
return false;
279
414
}
415
{
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
422
fprintf_plus(stderr,
423
"The total number of considered keys: %d\n",
424
import_result->considered);
425
fprintf_plus(stderr,
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
428
fprintf_plus(stderr,
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
443
fprintf_plus(stderr,
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
446
fprintf_plus(stderr,
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
449
fprintf_plus(stderr,
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
459
import_status->fpr);
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
464
}
465
fprintf_plus(stderr, "Key status:\n");
466
fprintf_plus(stderr,
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
470
fprintf_plus(stderr,
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
486
}
487
return false;
488
}
489
}
280
490
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
491
ret = close(fd);
282
492
if(ret == -1){
283
493
perror_plus("close");
284
494
}
321
531
}
322
532
323
533
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
534
rc = gpgme_new(&(mc->ctx));
325
535
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
329
538
return false;
330
539
}
331
540
340
549
* Decrypt OpenPGP data.
341
550
* Returns -1 on error
342
551
*/
552
__attribute__((nonnull, warn_unused_result))
343
553
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
554
size_t crypto_size,
345
char **plaintext){
555
char **plaintext,
556
mandos_context *mc){
346
557
gpgme_data_t dh_crypto, dh_plain;
347
558
gpgme_error_t rc;
348
559
ssize_t ret;
365
576
/* Create new empty GPGME data buffer for the plaintext */
366
577
rc = gpgme_data_new(&dh_plain);
367
578
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
370
580
gpgme_strsource(rc), gpgme_strerror(rc));
371
581
gpgme_data_release(dh_crypto);
372
582
return -1;
374
584
375
585
/* Decrypt data from the cryptotext data buffer to the plaintext
376
586
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
587
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
588
if(rc != GPG_ERR_NO_ERROR){
379
589
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
590
gpgme_strsource(rc), gpgme_strerror(rc));
381
591
plaintext_length = -1;
382
592
if(debug){
383
593
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
594
result = gpgme_op_decrypt_result(mc->ctx);
385
595
if(result == NULL){
386
596
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
597
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
601
}
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
392
604
if(result->file_name != NULL){
393
605
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
606
}
395
gpgme_recipient_t recipient;
396
recipient = result->recipients;
397
while(recipient != NULL){
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
398
610
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
402
613
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
406
615
}
407
616
}
408
617
}
464
673
return plaintext_length;
465
674
}
466
675
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
678
if(str == NULL)
679
return "(unknown)";
680
return str;
681
}
682
683
__attribute__((warn_unused_result))
684
static const char *safer_gnutls_strerror(int value){
685
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
473
687
}
474
688
475
689
/* GnuTLS log function callback */
690
__attribute__((nonnull))
476
691
static void debuggnutls(__attribute__((unused)) int level,
477
692
const char* string){
478
693
fprintf_plus(stderr, "GnuTLS: %s", string);
479
694
}
480
695
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
697
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
698
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
mandos_context *mc){
483
701
int ret;
702
unsigned int uret;
484
703
485
704
if(debug){
486
705
fprintf_plus(stderr, "Initializing GnuTLS\n");
487
706
}
488
707
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
493
return -1;
494
}
495
496
708
if(debug){
497
709
/* "Use a log level over 10 to enable all debugging options."
498
710
* - GnuTLS manual
502
714
}
503
715
504
716
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
717
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
718
if(ret != GNUTLS_E_SUCCESS){
507
719
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
720
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
510
721
return -1;
511
722
}
512
723
518
729
}
519
730
520
731
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
732
(mc->cred, pubkeyfilename, seckeyfilename,
522
733
GNUTLS_OPENPGP_FMT_BASE64);
523
734
if(ret != GNUTLS_E_SUCCESS){
524
735
fprintf_plus(stderr,
530
741
}
531
742
532
743
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
744
ret = gnutls_dh_params_init(&mc->dh_params);
534
745
if(ret != GNUTLS_E_SUCCESS){
535
746
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
747
" initialization: %s\n",
537
748
safer_gnutls_strerror(ret));
538
749
goto globalfail;
539
750
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
754
do {
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
756
if(dhpfile == -1){
757
perror_plus("open");
758
dhparamsfilename = NULL;
759
break;
760
}
761
size_t params_capacity = 0;
762
while(true){
763
params_capacity = incbuffer((char **)¶ms.data,
764
(size_t)params.size,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
768
free(params.data);
769
params.data = NULL;
770
dhparamsfilename = NULL;
771
break;
772
}
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
775
BUFFER_SIZE);
776
/* EOF */
777
if(bytes_read == 0){
778
break;
779
}
780
/* check bytes_read for failure */
781
if(bytes_read < 0){
782
perror_plus("read");
783
free(params.data);
784
params.data = NULL;
785
dhparamsfilename = NULL;
786
break;
787
}
788
params.size += (unsigned int)bytes_read;
789
}
790
ret = close(dhpfile);
791
if(ret == -1){
792
perror_plus("close");
793
}
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
796
}
797
if(dhparamsfilename == NULL){
798
break;
799
}
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
807
}
808
free(params.data);
809
} while(false);
810
}
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
816
do {
817
int secfile = open(seckeyfilename, O_RDONLY);
818
if(secfile == -1){
819
perror_plus("open");
820
break;
821
}
822
size_t buffer_capacity = 0;
823
while(true){
824
buffer_capacity = incbuffer((char **)&buffer.data,
825
(size_t)buffer.size,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
829
free(buffer.data);
830
buffer.data = NULL;
831
break;
832
}
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
835
BUFFER_SIZE);
836
/* EOF */
837
if(bytes_read == 0){
838
break;
839
}
840
/* check bytes_read for failure */
841
if(bytes_read < 0){
842
perror_plus("read");
843
free(buffer.data);
844
buffer.data = NULL;
845
break;
846
}
847
buffer.size += (unsigned int)bytes_read;
848
}
849
close(secfile);
850
} while(false);
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
854
{
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
859
" structure: %s",
860
safer_gnutls_strerror(ret));
861
free(buffer.data);
862
buffer.data = NULL;
863
} else {
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
869
privkey = NULL;
870
}
871
free(buffer.data);
872
buffer.data = NULL;
873
if(privkey != NULL){
874
/* Use private key to suggest an appropriate
875
sec_param */
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
878
if(debug){
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
882
(sec_param)));
883
}
884
}
885
}
886
}
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
890
if(debug){
891
fprintf_plus(stderr, "Falling back to security parameter"
892
" \"%s\"\n",
893
safe_string(gnutls_sec_param_get_name
894
(sec_param)));
895
}
896
}
897
}
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
if(uret != 0){
900
mc->dh_bits = uret;
901
if(debug){
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)),
906
mc->dh_bits);
907
}
908
} else {
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
912
(sec_param)),
913
safer_gnutls_strerror(ret));
914
goto globalfail;
915
}
916
} else if(debug){
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
mc->dh_bits);
919
}
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
925
goto globalfail;
926
}
927
}
928
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
929
549
930
return 0;
550
931
551
932
globalfail:
552
933
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
934
gnutls_certificate_free_credentials(mc->cred);
935
gnutls_dh_params_deinit(mc->dh_params);
556
936
return -1;
557
937
}
558
938
559
static int init_gnutls_session(gnutls_session_t *session){
939
__attribute__((nonnull, warn_unused_result))
940
static int init_gnutls_session(gnutls_session_t *session,
941
mandos_context *mc){
560
942
int ret;
561
943
/* GnuTLS session creation */
562
944
do {
574
956
{
575
957
const char *err;
576
958
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
959
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
960
if(quit_now){
579
961
gnutls_deinit(*session);
580
962
return -1;
591
973
592
974
do {
593
975
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
976
mc->cred);
595
977
if(quit_now){
596
978
gnutls_deinit(*session);
597
979
return -1;
607
989
/* ignore client certificate if any. */
608
990
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
991
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
992
return 0;
613
993
}
614
994
616
996
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
997
__attribute__((unused)) const char *txt){}
618
998
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1004
int ret;
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1011
if(debug){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1014
}
1015
return false;
1016
}
1017
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1021
return false;
1022
}
1023
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1025
if(devnull == -1){
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1027
return false;
1028
}
1029
pid_t pid = fork();
1030
if(pid == 0){
1031
/* Child */
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1034
if(errno != 0){
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1037
} else {
1038
/* Set group */
1039
errno = 0;
1040
ret = setgid(0);
1041
if(ret == -1){
1042
perror_plus("setgid");
1043
_exit(EX_NOPERM);
1044
}
1045
/* Reset supplementary groups */
1046
errno = 0;
1047
ret = setgroups(0, NULL);
1048
if(ret == -1){
1049
perror_plus("setgroups");
1050
_exit(EX_NOPERM);
1051
}
1052
}
1053
ret = dup2(devnull, STDIN_FILENO);
1054
if(ret == -1){
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1056
_exit(EX_OSERR);
1057
}
1058
ret = close(devnull);
1059
if(ret == -1){
1060
perror_plus("close");
1061
_exit(EX_OSERR);
1062
}
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
if(ret == -1){
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1066
_exit(EX_OSERR);
1067
}
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1069
O_RDONLY
1070
| O_DIRECTORY
1071
| O_PATH
1072
| O_CLOEXEC));
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1076
}
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1078
helper, O_RDONLY));
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1083
}
1084
close(helperdir_fd);
1085
#ifdef __GNUC__
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1088
#endif
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1092
environ) == -1){
1093
#ifdef __GNUC__
1094
#pragma GCC diagnostic pop
1095
#endif
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1098
}
1099
}
1100
if(pid == -1){
1101
perror_plus("fork");
1102
return false;
1103
}
1104
int status;
1105
pid_t pret = -1;
1106
errno = 0;
1107
do {
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1115
}
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1118
}
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1121
" helper program");
1122
}
1123
return false;
1124
}
1125
} while(pret == -1 and errno == EINTR);
1126
if(pret == -1){
1127
perror_plus("waitpid");
1128
return false;
1129
}
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1134
return false;
1135
}
1136
return true;
1137
}
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1141
return false;
1142
}
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1144
return false;
1145
}
1146
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1150
if(debug){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1152
}
1153
return add_delete_local_route(true, address, if_index);
1154
}
1155
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1159
if(debug){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1161
}
1162
return add_delete_local_route(false, address, if_index);
1163
}
1164
619
1165
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1166
__attribute__((nonnull, warn_unused_result))
1167
static int start_mandos_communication(const char *ip, in_port_t port,
621
1168
AvahiIfIndex if_index,
622
int af){
1169
int af, mandos_context *mc){
623
1170
int ret, tcp_sd = -1;
624
1171
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1172
struct sockaddr_storage to;
629
1173
char *buffer = NULL;
630
1174
char *decrypted_buffer = NULL;
631
1175
size_t buffer_length = 0;
634
1178
int retval = -1;
635
1179
gnutls_session_t session;
636
1180
int pf; /* Protocol family */
1181
bool route_added = false;
637
1182
638
1183
errno = 0;
639
1184
655
1200
return -1;
656
1201
}
657
1202
658
ret = init_gnutls_session(&session);
1203
/* If the interface is specified and we have a list of interfaces */
1204
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1205
/* Check if the interface is one of the interfaces we are using */
1206
bool match = false;
1207
{
1208
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
1212
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
match = true;
1214
break;
1215
}
1216
}
1217
}
1218
if(not match){
1219
/* This interface does not match any in the list, so we don't
1220
connect to the server */
1221
if(debug){
1222
char interface[IF_NAMESIZE];
1223
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1224
perror_plus("if_indextoname");
1225
} else {
1226
fprintf_plus(stderr, "Skipping server on non-used interface"
1227
" \"%s\"\n",
1228
if_indextoname((unsigned int)if_index,
1229
interface));
1230
}
1231
}
1232
return -1;
1233
}
1234
}
1235
1236
ret = init_gnutls_session(&session, mc);
659
1237
if(ret != 0){
660
1238
return -1;
661
1239
}
662
1240
663
1241
if(debug){
664
1242
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1243
PRIuMAX "\n", ip, (uintmax_t)port);
666
1244
}
667
1245
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1247
if(tcp_sd < 0){
670
1248
int e = errno;
671
1249
perror_plus("socket");
678
1256
goto mandos_end;
679
1257
}
680
1258
681
memset(&to, 0, sizeof(to));
682
1259
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1260
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1261
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1262
ret = inet_pton(af, ip, &to6->sin6_addr);
685
1263
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1264
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1265
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1266
ret = inet_pton(af, ip, &to4->sin_addr);
688
1267
}
689
1268
if(ret < 0 ){
690
1269
int e = errno;
699
1278
goto mandos_end;
700
1279
}
701
1280
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1281
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1282
if(IN6_IS_ADDR_LINKLOCAL
1283
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1284
if(if_index == AVAHI_IF_UNSPEC){
710
1285
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1286
" incomplete without a network interface\n");
713
1288
goto mandos_end;
714
1289
}
715
1290
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1291
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1292
}
718
1293
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1294
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1295
}
723
1296
724
1297
if(quit_now){
732
1305
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1306
perror_plus("if_indextoname");
734
1307
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1308
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1309
"\n", ip, interface, (uintmax_t)port);
737
1310
}
738
1311
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1312
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1313
ip, (uintmax_t)port);
741
1314
}
742
1315
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1316
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
1317
if(af == AF_INET6){
1318
ret = getnameinfo((struct sockaddr *)&to,
1319
sizeof(struct sockaddr_in6),
1320
addrstr, sizeof(addrstr), NULL, 0,
1321
NI_NUMERICHOST);
1322
} else {
1323
ret = getnameinfo((struct sockaddr *)&to,
1324
sizeof(struct sockaddr_in),
1325
addrstr, sizeof(addrstr), NULL, 0,
1326
NI_NUMERICHOST);
1327
}
1328
if(ret == EAI_SYSTEM){
1329
perror_plus("getnameinfo");
1330
} else if(ret != 0) {
1331
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1332
} else if(strcmp(addrstr, ip) != 0){
1333
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1334
}
1335
}
1336
1337
if(quit_now){
1338
errno = EINTR;
1339
goto mandos_end;
1340
}
1341
1342
while(true){
1343
if(af == AF_INET6){
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1346
} else {
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1349
}
1350
if(ret < 0){
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1357
&to)->sin6_addr)))
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1368
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1372
*/
1373
if(debug){
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1375
" direct route\n");
1376
}
1377
int e = errno;
1378
route_added = add_local_route(ip, if_index);
1379
if(route_added){
1380
continue;
1381
}
1382
errno = e;
1383
}
1384
if(errno != ECONNREFUSED or debug){
1385
int e = errno;
1386
perror_plus("connect");
1387
errno = e;
1388
}
1389
goto mandos_end;
1390
}
1391
1392
if(quit_now){
1393
errno = EINTR;
1394
goto mandos_end;
1395
}
1396
break;
783
1397
}
784
1398
785
1399
const char *out = mandos_protocol_version;
821
1435
goto mandos_end;
822
1436
}
823
1437
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1438
/* This casting via intptr_t is to eliminate warning about casting
1439
an int to a pointer type. This is exactly how the GnuTLS Guile
1440
function "set-session-transport-fd!" does it. */
1441
gnutls_transport_set_ptr(session,
1442
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
1443
827
1444
if(quit_now){
828
1445
errno = EINTR;
933
1550
if(buffer_length > 0){
934
1551
ssize_t decrypted_buffer_size;
935
1552
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
1553
&decrypted_buffer, mc);
937
1554
if(decrypted_buffer_size >= 0){
938
1555
1556
clearerr(stdout);
939
1557
written = 0;
940
1558
while(written < (size_t) decrypted_buffer_size){
941
1559
if(quit_now){
957
1575
}
958
1576
written += (size_t)ret;
959
1577
}
1578
ret = fflush(stdout);
1579
if(ret != 0){
1580
int e = errno;
1581
if(debug){
1582
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1583
strerror(errno));
1584
}
1585
errno = e;
1586
goto mandos_end;
1587
}
960
1588
retval = 0;
961
1589
}
962
1590
}
965
1593
966
1594
mandos_end:
967
1595
{
1596
if(route_added){
1597
if(not delete_local_route(ip, if_index)){
1598
fprintf_plus(stderr, "Failed to delete local route to %s on"
1599
" interface %d", ip, if_index);
1600
}
1601
}
968
1602
int e = errno;
969
1603
free(decrypted_buffer);
970
1604
free(buffer);
971
1605
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1606
ret = close(tcp_sd);
973
1607
}
974
1608
if(ret == -1){
975
1609
if(e == 0){
1000
1634
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1635
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1636
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1637
void *mc){
1638
if(r == NULL){
1639
return;
1640
}
1005
1641
1006
1642
/* Called whenever a service has been resolved successfully or
1007
1643
timed out */
1008
1644
1009
1645
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1010
1647
return;
1011
1648
}
1012
1649
1016
1653
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1654
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1655
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1656
avahi_strerror(avahi_server_errno
1657
(((mandos_context*)mc)->server)));
1020
1658
break;
1021
1659
1022
1660
case AVAHI_RESOLVER_FOUND:
1028
1666
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1667
host_name, ip, (intmax_t)interface, port);
1030
1668
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1669
int ret = start_mandos_communication(ip, (in_port_t)port,
1670
interface,
1671
avahi_proto_to_af(proto),
1672
mc);
1033
1673
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1674
avahi_simple_poll_quit(simple_poll);
1035
1675
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1676
if(not add_server(ip, (in_port_t)port, interface,
1677
avahi_proto_to_af(proto),
1678
&((mandos_context*)mc)->current_server)){
1038
1679
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1680
" list\n", name);
1040
1681
}
1053
1694
const char *domain,
1054
1695
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1696
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1697
void *mc){
1698
if(b == NULL){
1699
return;
1700
}
1058
1701
1059
1702
/* Called whenever a new services becomes available on the LAN or
1060
1703
is removed from the LAN */
1068
1711
case AVAHI_BROWSER_FAILURE:
1069
1712
1070
1713
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1714
avahi_strerror(avahi_server_errno
1715
(((mandos_context*)mc)->server)));
1716
avahi_simple_poll_quit(simple_poll);
1073
1717
return;
1074
1718
1075
1719
case AVAHI_BROWSER_NEW:
1078
1722
the callback function is called the Avahi server will free the
1079
1723
resolver for us. */
1080
1724
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1725
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1726
interface, protocol, name, type,
1727
domain, protocol, 0,
1728
resolve_callback, mc) == NULL)
1084
1729
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1730
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1731
avahi_strerror(avahi_server_errno
1732
(((mandos_context*)mc)->server)));
1087
1733
break;
1088
1734
1089
1735
case AVAHI_BROWSER_REMOVE:
1108
1754
signal_received = sig;
1109
1755
int old_errno = errno;
1110
1756
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1757
if(simple_poll != NULL){
1758
avahi_simple_poll_quit(simple_poll);
1113
1759
}
1114
1760
errno = old_errno;
1115
1761
}
1116
1762
1763
__attribute__((nonnull, warn_unused_result))
1117
1764
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1765
int ret;
1766
int old_errno;
1119
1767
1120
1768
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1769
if(s < 0){
1770
old_errno = errno;
1122
1771
perror_plus("socket");
1772
errno = old_errno;
1123
1773
return false;
1124
1774
}
1125
strcpy(ifr->ifr_name, ifname);
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1126
1777
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1778
if(ret == -1){
1128
1779
if(debug){
1780
old_errno = errno;
1129
1781
perror_plus("ioctl SIOCGIFFLAGS");
1782
errno = old_errno;
1783
}
1784
if((close(s) == -1) and debug){
1785
old_errno = errno;
1786
perror_plus("close");
1787
errno = old_errno;
1130
1788
}
1131
1789
return false;
1132
1790
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1133
1796
return true;
1134
1797
}
1135
1798
1799
__attribute__((nonnull, warn_unused_result))
1136
1800
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1801
1138
1802
/* Reject the loopback device */
1180
1844
* corresponds to an acceptable network device.
1181
1845
* (This function is passed to scandir(3) as a filter function.)
1182
1846
*/
1847
__attribute__((nonnull, warn_unused_result))
1183
1848
int good_interface(const struct dirent *if_entry){
1184
1849
if(if_entry->d_name[0] == '.'){
1185
1850
return 0;
1201
1866
}
1202
1867
1203
1868
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1869
* This function determines if a network interface is up.
1870
*/
1871
__attribute__((nonnull, warn_unused_result))
1872
bool interface_is_up(const char *interface){
1873
struct ifreq ifr;
1874
if(not get_flags(interface, &ifr)){
1875
if(debug){
1876
fprintf_plus(stderr, "Failed to get flags for interface "
1877
"\"%s\"\n", interface);
1878
}
1879
return false;
1880
}
1881
1882
return (bool)(ifr.ifr_flags & IFF_UP);
1883
}
1884
1885
/*
1886
* This function determines if a network interface is running
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
bool interface_is_running(const char *interface){
1890
struct ifreq ifr;
1891
if(not get_flags(interface, &ifr)){
1892
if(debug){
1893
fprintf_plus(stderr, "Failed to get flags for interface "
1894
"\"%s\"\n", interface);
1895
}
1896
return false;
1897
}
1898
1899
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1900
}
1901
1902
__attribute__((nonnull, pure, warn_unused_result))
1246
1903
int notdotentries(const struct dirent *direntry){
1247
1904
/* Skip "." and ".." */
1248
1905
if(direntry->d_name[0] == '.'
1255
1912
}
1256
1913
1257
1914
/* Is this directory entry a runnable program? */
1915
__attribute__((nonnull, warn_unused_result))
1258
1916
int runnable_hook(const struct dirent *direntry){
1259
1917
int ret;
1260
1918
size_t sret;
1268
1926
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
1927
"abcdefghijklmnopqrstuvwxyz"
1270
1928
"0123456789"
1271
"_-");
1929
"_.-");
1272
1930
if((direntry->d_name)[sret] != '\0'){
1273
1931
/* Contains non-allowed characters */
1274
1932
if(debug){
1278
1936
return 0;
1279
1937
}
1280
1938
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1289
1940
if(ret == -1){
1290
1941
if(debug){
1291
1942
perror_plus("Could not stat hook");
1315
1966
return 1;
1316
1967
}
1317
1968
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1969
__attribute__((nonnull, warn_unused_result))
1970
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
mandos_context *mc){
1319
1972
int ret;
1320
1973
struct timespec now;
1321
1974
struct timespec waited_time;
1322
1975
intmax_t block_time;
1323
1976
1324
1977
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1978
if(mc->current_server == NULL){
1979
if(debug){
1327
1980
fprintf_plus(stderr, "Wait until first server is found."
1328
1981
" No timeout!\n");
1329
1982
}
1330
1983
ret = avahi_simple_poll_iterate(s, -1);
1331
1984
} else {
1332
if (debug){
1985
if(debug){
1333
1986
fprintf_plus(stderr, "Check current_server if we should run"
1334
1987
" it, or wait\n");
1335
1988
}
1342
1995
/* Calculating in ms how long time between now and server
1343
1996
who we visted longest time ago. Now - last seen. */
1344
1997
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1998
- mc->current_server->last_seen.tv_sec);
1346
1999
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
2000
- mc->current_server->last_seen.tv_nsec);
1348
2001
/* total time is 10s/10,000ms.
1349
2002
Converting to s from ms by dividing by 1,000,
1350
2003
and ns to ms by dividing by 1,000,000. */
1352
2005
- ((intmax_t)waited_time.tv_sec * 1000))
1353
2006
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
2007
1355
if (debug){
2008
if(debug){
1356
2009
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
2010
block_time);
1358
2011
}
1359
2012
1360
2013
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
2014
ret = start_mandos_communication(mc->current_server->ip,
2015
mc->current_server->port,
2016
mc->current_server->if_index,
2017
mc->current_server->af, mc);
1365
2018
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
2019
avahi_simple_poll_quit(s);
1367
2020
return 0;
1368
2021
}
1369
2022
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
2023
&mc->current_server->last_seen);
1371
2024
if(ret == -1){
1372
2025
perror_plus("clock_gettime");
1373
2026
return -1;
1374
2027
}
1375
mc.current_server = mc.current_server->next;
2028
mc->current_server = mc->current_server->next;
1376
2029
block_time = 0; /* Call avahi to find new Mandos
1377
2030
servers, but don't block */
1378
2031
}
1380
2033
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
2034
}
1382
2035
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
2036
if(ret > 0 or errno != EINTR){
1384
2037
return (ret != 1) ? ret : 0;
1385
2038
}
1386
2039
}
1387
2040
}
1388
2041
}
1389
2042
1390
bool run_network_hooks(const char *mode, const char *interface,
2043
__attribute__((nonnull))
2044
void run_network_hooks(const char *mode, const char *interface,
1391
2045
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
2046
struct dirent **direntries = NULL;
2047
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
2050
if(hookdir_fd == -1){
2051
if(errno == ENOENT){
2052
if(debug){
2053
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2054
" found\n", hookdir);
2055
}
2056
} else {
2057
perror_plus("open");
2058
}
2059
return;
2060
}
2061
}
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2063
if(devnull == -1){
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2065
return;
2066
}
2067
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
runnable_hook, alphasort);
1397
2069
if(numhooks == -1){
1398
2070
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
2071
close(devnull);
2072
return;
2073
}
2074
struct dirent *direntry;
2075
int ret;
2076
for(int i = 0; i < numhooks; i++){
2077
direntry = direntries[i];
2078
if(debug){
2079
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2080
direntry->d_name);
2081
}
2082
pid_t hook_pid = fork();
2083
if(hook_pid == 0){
2084
/* Child */
2085
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2087
if(errno != 0){
2088
perror_plus("Failed to raise privileges");
2089
_exit(EX_NOPERM);
2090
}
2091
/* Set group */
2092
errno = 0;
2093
ret = setgid(0);
2094
if(ret == -1){
2095
perror_plus("setgid");
2096
_exit(EX_NOPERM);
2097
}
2098
/* Reset supplementary groups */
2099
errno = 0;
2100
ret = setgroups(0, NULL);
2101
if(ret == -1){
2102
perror_plus("setgroups");
2103
_exit(EX_NOPERM);
2104
}
2105
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
if(ret == -1){
2107
perror_plus("setenv");
2108
_exit(EX_OSERR);
2109
}
2110
ret = setenv("DEVICE", interface, 1);
2111
if(ret == -1){
2112
perror_plus("setenv");
2113
_exit(EX_OSERR);
2114
}
2115
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2116
if(ret == -1){
2117
perror_plus("setenv");
2118
_exit(EX_OSERR);
2119
}
2120
ret = setenv("MODE", mode, 1);
2121
if(ret == -1){
2122
perror_plus("setenv");
2123
_exit(EX_OSERR);
2124
}
2125
char *delaystring;
2126
ret = asprintf(&delaystring, "%f", (double)delay);
2127
if(ret == -1){
1406
2128
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
2129
_exit(EX_OSERR);
2130
}
2131
ret = setenv("DELAY", delaystring, 1);
2132
if(ret == -1){
1475
2133
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
2134
perror_plus("setenv");
2135
_exit(EX_OSERR);
2136
}
2137
free(delaystring);
2138
if(connect_to != NULL){
2139
ret = setenv("CONNECT", connect_to, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
}
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2146
direntry->d_name,
2147
O_RDONLY));
2148
if(hook_fd == -1){
2149
perror_plus("openat");
2150
_exit(EXIT_FAILURE);
2151
}
2152
if(close(hookdir_fd) == -1){
2153
perror_plus("close");
2154
_exit(EXIT_FAILURE);
2155
}
2156
ret = dup2(devnull, STDIN_FILENO);
2157
if(ret == -1){
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2159
_exit(EX_OSERR);
2160
}
2161
ret = close(devnull);
2162
if(ret == -1){
2163
perror_plus("close");
2164
_exit(EX_OSERR);
2165
}
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2167
if(ret == -1){
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2169
_exit(EX_OSERR);
2170
}
2171
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2172
environ) == -1){
2173
perror_plus("fexecve");
2174
_exit(EXIT_FAILURE);
2175
}
2176
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
int status;
2183
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
perror_plus("waitpid");
2185
free(direntry);
2186
continue;
2187
}
2188
if(WIFEXITED(status)){
2189
if(WEXITSTATUS(status) != 0){
2190
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
" with status %d\n", direntry->d_name,
2192
WEXITSTATUS(status));
2193
free(direntry);
2194
continue;
2195
}
2196
} else if(WIFSIGNALED(status)){
2197
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
" signal %d\n", direntry->d_name,
2199
WTERMSIG(status));
2200
free(direntry);
2201
continue;
2202
} else {
2203
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
continue;
2207
}
2208
}
2209
if(debug){
2210
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
direntry->d_name);
2212
}
2213
free(direntry);
2214
}
2215
free(direntries);
2216
if(close(hookdir_fd) == -1){
2217
perror_plus("close");
2218
} else {
2219
hookdir_fd = -1;
2220
}
2221
close(devnull);
2222
}
2223
2224
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
2228
int ret;
2229
struct ifreq network;
2230
unsigned int if_index = if_nametoindex(interface);
2231
if(if_index == 0){
2232
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2233
errno = old_errno;
2234
return ENXIO;
2235
}
2236
2237
if(quit_now){
2238
errno = old_errno;
2239
return EINTR;
2240
}
2241
2242
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network)){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags |= IFF_UP; /* set flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(quit_now){
2263
ret = close(sd);
2264
if(ret == -1){
2265
perror_plus("close");
2266
}
2267
errno = old_errno;
2268
return EINTR;
2269
}
2270
2271
if(debug){
2272
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2273
interface);
2274
}
2275
2276
/* Raise privileges */
2277
ret_errno = raise_privileges();
2278
if(ret_errno != 0){
2279
errno = ret_errno;
2280
perror_plus("Failed to raise privileges");
2281
}
2282
2283
#ifdef __linux__
2284
int ret_linux;
2285
bool restore_loglevel = false;
2286
if(ret_errno == 0){
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2288
messages about the network interface to mess up the prompt */
2289
ret_linux = klogctl(8, NULL, 5);
2290
if(ret_linux == -1){
2291
perror_plus("klogctl");
2292
} else {
2293
restore_loglevel = true;
2294
}
2295
}
2296
#endif /* __linux__ */
2297
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2298
ioctl_errno = errno;
2299
#ifdef __linux__
2300
if(restore_loglevel){
2301
ret_linux = klogctl(7, NULL, 0);
2302
if(ret_linux == -1){
2303
perror_plus("klogctl");
2304
}
2305
}
2306
#endif /* __linux__ */
2307
2308
/* If raise_privileges() succeeded above */
2309
if(ret_errno == 0){
2310
/* Lower privileges */
2311
ret_errno = lower_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to lower privileges");
2315
}
2316
}
2317
2318
/* Close the socket */
2319
ret = close(sd);
2320
if(ret == -1){
2321
perror_plus("close");
2322
}
2323
2324
if(ret_setflags == -1){
2325
errno = ioctl_errno;
2326
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2327
errno = old_errno;
2328
return ioctl_errno;
2329
}
2330
} else if(debug){
2331
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2332
interface);
2333
}
2334
2335
/* Sleep checking until interface is running.
2336
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
2338
if(interface_is_running(interface)){
2339
break;
2340
}
2341
struct timespec sleeptime = { .tv_nsec = 250000000 };
2342
ret = nanosleep(&sleeptime, NULL);
2343
if(ret == -1 and errno != EINTR){
2344
perror_plus("nanosleep");
2345
}
2346
}
2347
2348
errno = old_errno;
2349
return 0;
2350
}
2351
2352
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
2355
struct ifreq network;
2356
unsigned int if_index = if_nametoindex(interface);
2357
if(if_index == 0){
2358
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2359
errno = old_errno;
2360
return ENXIO;
2361
}
2362
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
2365
if(not get_flags(interface, &network) and debug){
2366
ret_errno = errno;
2367
fprintf_plus(stderr, "Failed to get flags for interface "
2368
"\"%s\"\n", interface);
2369
errno = old_errno;
2370
return ret_errno;
2371
}
2372
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2373
2374
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2375
if(sd == -1){
2376
ret_errno = errno;
2377
perror_plus("socket");
2378
errno = old_errno;
2379
return ret_errno;
2380
}
2381
2382
if(debug){
2383
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2384
interface);
2385
}
2386
2387
/* Raise privileges */
2388
ret_errno = raise_privileges();
2389
if(ret_errno != 0){
2390
errno = ret_errno;
2391
perror_plus("Failed to raise privileges");
2392
}
2393
2394
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2395
ioctl_errno = errno;
2396
2397
/* If raise_privileges() succeeded above */
2398
if(ret_errno == 0){
2399
/* Lower privileges */
2400
ret_errno = lower_privileges();
2401
if(ret_errno != 0){
2402
errno = ret_errno;
2403
perror_plus("Failed to lower privileges");
2404
}
2405
}
2406
2407
/* Close the socket */
2408
int ret = close(sd);
2409
if(ret == -1){
2410
perror_plus("close");
2411
}
2412
2413
if(ret_setflags == -1){
2414
errno = ioctl_errno;
2415
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2416
errno = old_errno;
2417
return ioctl_errno;
2418
}
2419
} else if(debug){
2420
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2421
interface);
2422
}
2423
2424
errno = old_errno;
2425
return 0;
1524
2426
}
1525
2427
1526
2428
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
1527
2434
AvahiSServiceBrowser *sb = NULL;
1528
int error;
2435
error_t ret_errno;
1529
2436
int ret;
1530
2437
intmax_t tmpmax;
1531
2438
char *tmp;
1532
2439
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2440
char *interfaces_to_take_down = NULL;
2441
size_t interfaces_to_take_down_size = 0;
2442
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2443
char old_tempdir[] = "/tmp/mandosXXXXXX";
2444
char *tempdir = NULL;
1541
2445
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
2446
const char *seckey = PATHDIR "/" SECKEY;
1543
2447
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
char *interfaces_hooks = NULL;
1544
2450
1545
2451
bool gnutls_initialized = false;
1546
2452
bool gpgme_initialized = false;
1598
2504
.doc = "Bit length of the prime number used in the"
1599
2505
" Diffie-Hellman key exchange",
1600
2506
.group = 2 },
2507
{ .name = "dh-params", .key = 134,
2508
.arg = "FILE",
2509
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2510
" for the Diffie-Hellman key exchange",
2511
.group = 2 },
1601
2512
{ .name = "priority", .key = 130,
1602
2513
.arg = "STRING",
1603
2514
.doc = "GnuTLS priority string for the TLS handshake",
1637
2548
connect_to = arg;
1638
2549
break;
1639
2550
case 'i': /* --interface */
1640
interface = arg;
2551
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2552
arg, (int)',');
2553
if(ret_errno != 0){
2554
argp_error(state, "%s", strerror(ret_errno));
2555
}
1641
2556
break;
1642
2557
case 's': /* --seckey */
1643
2558
seckey = arg;
1654
2569
}
1655
2570
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1656
2571
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
1657
2575
case 130: /* --priority */
1658
2576
mc.priority = arg;
1659
2577
break;
1699
2617
.args_doc = "",
1700
2618
.doc = "Mandos client -- Get and decrypt"
1701
2619
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
1705
2623
case 0:
1706
2624
break;
1707
2625
case ENOMEM:
1708
2626
default:
1709
errno = ret;
2627
errno = ret_errno;
1710
2628
perror_plus("argp_parse");
1711
2629
exitcode = EX_OSERR;
1712
2630
goto end;
1715
2633
goto end;
1716
2634
}
1717
2635
}
1718
2636
1719
2637
{
1720
2638
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
2639
<https://bugs.debian.org/633582> */
1722
2640
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2641
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2645
perror_plus("Failed to raise privileges");
1728
2646
} else {
1729
2647
struct stat st;
1730
2648
1745
2663
}
1746
2664
}
1747
2665
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
2666
close(seckey_fd);
1749
2667
}
1750
2668
}
1751
2669
1752
2670
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
2671
int pubkey_fd = open(pubkey, O_RDONLY);
1754
2672
if(pubkey_fd == -1){
1766
2684
}
1767
2685
}
1768
2686
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
2687
close(pubkey_fd);
2688
}
2689
}
2690
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2696
} else {
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2698
if(ret == -1){
2699
perror_plus("fstat");
2700
} else {
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2704
if(ret == -1){
2705
perror_plus("fchown");
2706
}
2707
}
2708
}
2709
close(dhparams_fd);
2710
}
2711
}
2712
1773
2713
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to lower privileges");
2718
}
2719
}
2720
}
2721
2722
/* Remove invalid interface names (except "none") */
2723
{
2724
char *interface = NULL;
2725
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2726
interface))){
2727
if(strcmp(interface, "none") != 0
2728
and if_nametoindex(interface) == 0){
2729
if(interface[0] != '\0'){
2730
fprintf_plus(stderr, "Not using nonexisting interface"
2731
" \"%s\"\n", interface);
2732
}
2733
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2734
interface = NULL;
1778
2735
}
1779
2736
}
1780
2737
}
1781
2738
1782
2739
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2740
{
2741
if(mc.interfaces != NULL){
2742
interfaces_hooks = malloc(mc.interfaces_size);
2743
if(interfaces_hooks == NULL){
2744
perror_plus("malloc");
2745
goto end;
2746
}
2747
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2749
}
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
1785
2752
}
1786
2753
1787
2754
if(not debug){
1788
2755
avahi_set_log_function(empty_log);
1789
2756
}
1790
2757
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
2758
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2759
from the signal handler */
1825
2760
/* Initialize the pseudo-RNG for Avahi */
1826
2761
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2762
simple_poll = avahi_simple_poll_new();
2763
if(simple_poll == NULL){
1829
2764
fprintf_plus(stderr,
1830
2765
"Avahi: Failed to create simple poll object.\n");
1831
2766
exitcode = EX_UNAVAILABLE;
1895
2830
}
1896
2831
}
1897
2832
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2833
/* If no interfaces were specified, make a list */
2834
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2836
/* Look for any good interfaces */
2837
ret = scandir(sys_class_net, &direntries, good_interface,
2838
alphasort);
2839
if(ret >= 1){
2840
/* Add all found interfaces to interfaces list */
2841
for(int i = 0; i < ret; ++i){
2842
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2843
direntries[i]->d_name);
2844
if(ret_errno != 0){
2845
errno = ret_errno;
2846
perror_plus("argz_add");
2847
free(direntries[i]);
2848
continue;
2849
}
2850
if(debug){
2851
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
direntries[i]->d_name);
2853
}
2854
free(direntries[i]);
2855
}
2856
free(direntries);
2857
} else {
2858
if(ret == 0){
2859
free(direntries);
2860
}
2861
fprintf_plus(stderr, "Could not find a network interface\n");
2862
exitcode = EXIT_FAILURE;
2863
goto end;
2864
}
2865
}
2866
2867
/* Bring up interfaces which are down, and remove any "none"s */
2868
{
2869
char *interface = NULL;
2870
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2871
interface))){
2872
/* If interface name is "none", stop bringing up interfaces.
2873
Also remove all instances of "none" from the list */
2874
if(strcmp(interface, "none") == 0){
2875
argz_delete(&mc.interfaces, &mc.interfaces_size,
2876
interface);
2877
interface = NULL;
2878
while((interface = argz_next(mc.interfaces,
2879
mc.interfaces_size, interface))){
2880
if(strcmp(interface, "none") == 0){
2881
argz_delete(&mc.interfaces, &mc.interfaces_size,
2882
interface);
2883
interface = NULL;
1983
2884
}
1984
2885
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
2886
break;
2003
2887
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2888
bool interface_was_up = interface_is_up(interface);
2889
errno = bring_up_interface(interface, delay);
2890
if(not interface_was_up){
2891
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2894
} else {
2895
errno = argz_add(&interfaces_to_take_down,
2896
&interfaces_to_take_down_size,
2897
interface);
2898
if(errno != 0){
2899
perror_plus("argz_add");
2900
}
2901
}
2902
}
2903
}
2904
if(debug and (interfaces_to_take_down == NULL)){
2905
fprintf_plus(stderr, "No interfaces were brought up\n");
2906
}
2907
}
2908
2909
/* If we only got one interface, explicitly use only that one */
2910
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2911
if(debug){
2912
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2913
mc.interfaces);
2914
}
2915
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2033
2916
}
2034
2917
2035
2918
if(quit_now){
2036
2919
goto end;
2037
2920
}
2038
2921
2039
ret = init_gnutls_global(pubkey, seckey);
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2040
2923
if(ret == -1){
2041
2924
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2925
exitcode = EX_UNAVAILABLE;
2049
2932
goto end;
2050
2933
}
2051
2934
2052
if(mkdtemp(tempdir) == NULL){
2935
/* Try /run/tmp before /tmp */
2936
tempdir = mkdtemp(run_tempdir);
2937
if(tempdir == NULL and errno == ENOENT){
2938
if(debug){
2939
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2940
run_tempdir, old_tempdir);
2941
}
2942
tempdir = mkdtemp(old_tempdir);
2943
}
2944
if(tempdir == NULL){
2053
2945
perror_plus("mkdtemp");
2054
2946
goto end;
2055
2947
}
2056
tempdir_created = true;
2057
2948
2058
2949
if(quit_now){
2059
2950
goto end;
2060
2951
}
2061
2952
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2953
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2954
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2955
exitcode = EX_UNAVAILABLE;
2065
2956
goto end;
2075
2966
/* Connect directly, do not use Zeroconf */
2076
2967
/* (Mainly meant for debugging) */
2077
2968
char *address = strrchr(connect_to, ':');
2969
2078
2970
if(address == NULL){
2079
2971
fprintf_plus(stderr, "No colon in address\n");
2080
2972
exitcode = EX_USAGE;
2085
2977
goto end;
2086
2978
}
2087
2979
2088
uint16_t port;
2980
in_port_t port;
2089
2981
errno = 0;
2090
2982
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2983
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2984
or tmpmax != (in_port_t)tmpmax){
2093
2985
fprintf_plus(stderr, "Bad port number\n");
2094
2986
exitcode = EX_USAGE;
2095
2987
goto end;
2096
2988
}
2097
2989
2098
2990
if(quit_now){
2099
2991
goto end;
2100
2992
}
2101
2993
2102
port = (uint16_t)tmpmax;
2994
port = (in_port_t)tmpmax;
2103
2995
*address = '\0';
2104
2996
/* Colon in address indicates IPv6 */
2105
2997
int af;
2121
3013
}
2122
3014
2123
3015
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
3016
ret = start_mandos_communication(address, port, if_index, af,
3017
&mc);
2125
3018
if(quit_now or ret == 0){
2126
3019
break;
2127
3020
}
2129
3022
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
3023
(int)retry_interval);
2131
3024
}
2132
sleep((int)retry_interval);
3025
sleep((unsigned int)retry_interval);
2133
3026
}
2134
3027
2135
if (not quit_now){
3028
if(not quit_now){
2136
3029
exitcode = EXIT_SUCCESS;
2137
3030
}
2138
3031
2153
3046
config.publish_domain = 0;
2154
3047
2155
3048
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
3049
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
2159
3051
2160
3052
/* Free the Avahi configuration data */
2161
3053
avahi_server_config_free(&config);
2164
3056
/* Check if creating the Avahi server object succeeded */
2165
3057
if(mc.server == NULL){
2166
3058
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
3059
avahi_strerror(ret));
2168
3060
exitcode = EX_UNAVAILABLE;
2169
3061
goto end;
2170
3062
}
2176
3068
/* Create the Avahi service browser */
2177
3069
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
3070
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
3071
NULL, 0, browse_callback,
3072
(void *)&mc);
2180
3073
if(sb == NULL){
2181
3074
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
3075
avahi_strerror(avahi_server_errno(mc.server)));
2193
3086
if(debug){
2194
3087
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
3088
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
3089
3090
ret = avahi_loop_with_timeout(simple_poll,
3091
(int)(retry_interval * 1000), &mc);
2199
3092
if(debug){
2200
3093
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
3094
(ret == 0) ? "successfully" : "with error");
2204
3097
end:
2205
3098
2206
3099
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3104
} else {
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3106
}
2208
3107
}
2209
3108
2210
3109
/* Cleanup things */
3110
free(mc.interfaces);
3111
2211
3112
if(sb != NULL)
2212
3113
avahi_s_service_browser_free(sb);
2213
3114
2214
3115
if(mc.server != NULL)
2215
3116
avahi_server_free(mc.server);
2216
3117
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
3118
if(simple_poll != NULL)
3119
avahi_simple_poll_free(simple_poll);
2219
3120
2220
3121
if(gnutls_initialized){
2221
3122
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
2223
3123
gnutls_dh_params_deinit(mc.dh_params);
2224
3124
}
2225
3125
2233
3133
mc.current_server->prev->next = NULL;
2234
3134
while(mc.current_server != NULL){
2235
3135
server *next = mc.current_server->next;
3136
#ifdef __GNUC__
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3139
#endif
3140
free((char *)(mc.current_server->ip));
3141
#ifdef __GNUC__
3142
#pragma GCC diagnostic pop
3143
#endif
2236
3144
free(mc.current_server);
2237
3145
mc.current_server = next;
2238
3146
}
2239
3147
}
2240
3148
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
3149
/* Re-raise privileges */
2245
3150
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
3154
perror_plus("Failed to raise privileges");
3155
} else {
3156
3157
/* Run network hooks */
3158
run_network_hooks("stop", interfaces_hooks != NULL ?
3159
interfaces_hooks : "", delay);
3160
3161
/* Take down the network interfaces which were brought up */
3162
{
3163
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3166
interface))){
3167
ret = take_down_interface(interface);
3168
if(ret != 0){
3169
errno = ret;
3170
perror_plus("Failed to take down interface");
3171
}
3172
}
3173
if(debug and (interfaces_to_take_down == NULL)){
3174
fprintf_plus(stderr, "No interfaces needed to be taken"
3175
" down\n");
3176
}
3177
}
2250
3178
}
2251
3179
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
3183
perror_plus("Failed to lower privileges permanently");
2268
3184
}
2269
3185
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
3186
3187
free(interfaces_to_take_down);
3188
free(interfaces_hooks);
3189
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
3192
struct dirent **direntries = NULL;
3193
int dret;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3195
O_RDONLY
3196
| O_NOFOLLOW
3197
| O_DIRECTORY
3198
| O_PATH));
3199
if(dir_fd == -1){
3200
perror_plus("open");
3201
return;
3202
}
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
3206
for(int i = 0; i < numentries; i++){
3207
if(debug){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3210
}
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3212
if(dret == -1){
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3215
AT_REMOVEDIR);
3216
}
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3222
dret = 0;
3223
}
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3227
}
3228
}
3229
free(direntries[i]);
3230
}
3231
3232
/* need to clean even if 0 because man page doesn't specify */
3233
free(direntries);
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3237
}
3238
} else {
3239
perror_plus("scandirat");
3240
}
3241
close(dir_fd);
2275
3242
}
2276
3243
2277
3244
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2299
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2310
}
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2311
3247
}
2312
3248
2313
3249
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0