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- Committer: teddy at recompile
- Date: 2020-04-05 21:30:59 UTC
- Revision ID: teddy@recompile.se-20200405213059-fb2a61ckqynrmatk
Fix file descriptor leak in mandos-client
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2019 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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
stdout, ferror() */
44
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
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#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
65
72
program_invocation_short_name */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
91
99
argz_delete(), argz_append(),
92
100
argz_stringify(), argz_add(),
93
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
94
104
95
105
#ifdef __linux__
96
106
#include <sys/klog.h> /* klogctl() */
113
123
gnutls_*
114
124
init_gnutls_session(),
115
125
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
116
127
#include <gnutls/openpgp.h>
117
128
/* gnutls_certificate_set_openpgp_key_file(),
118
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
119
135
120
136
/* GPGME */
121
137
#include <gpgme.h> /* All GPGME types, constants and
129
145
#define PATHDIR "/conf/conf.d/mandos"
130
146
#define SECKEY "seckey.txt"
131
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
132
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
151
134
152
bool debug = false;
138
156
static const char sys_class_net[] = "/sys/class/net";
139
157
char *connect_to = NULL;
140
158
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
141
160
uid_t uid = 65534;
142
161
gid_t gid = 65534;
143
162
161
180
const char *priority;
162
181
gpgme_ctx_t ctx;
163
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
164
185
} mandos_context;
165
186
166
187
/* global so signal handler can reach it*/
178
199
perror(print_text);
179
200
}
180
201
181
__attribute__((format (gnu_printf, 2, 3)))
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
203
int fprintf_plus(FILE *stream, const char *format, ...){
183
204
va_list ap;
184
205
va_start (ap, format);
185
206
186
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
208
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
210
}
190
211
191
212
/*
193
214
* bytes. "buffer_capacity" is how much is currently allocated,
194
215
* "buffer_length" is how much is already used.
195
216
*/
217
__attribute__((nonnull, warn_unused_result))
196
218
size_t incbuffer(char **buffer, size_t buffer_length,
197
219
size_t buffer_capacity){
198
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
201
227
return 0;
202
228
}
229
*buffer = new_buf;
203
230
buffer_capacity += BUFFER_SIZE;
204
231
}
205
232
return buffer_capacity;
206
233
}
207
234
208
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
209
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
238
int af, server **current_server){
211
239
int ret;
220
248
.af = af };
221
249
if(new_server->ip == NULL){
222
250
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
223
266
return false;
224
267
}
225
268
/* Special case of first server */
227
270
new_server->next = new_server;
228
271
new_server->prev = new_server;
229
272
*current_server = new_server;
230
/* Place the new server last in the list */
231
273
} else {
274
/* Place the new server last in the list */
232
275
new_server->next = *current_server;
233
276
new_server->prev = (*current_server)->prev;
234
277
new_server->prev->next = new_server;
235
278
(*current_server)->prev = new_server;
236
279
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
280
return true;
243
281
}
244
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
245
335
/*
246
336
* Initialize GPGME.
247
337
*/
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
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
343
gpgme_error_t rc;
251
344
gpgme_engine_info_t engine_info;
252
345
253
346
/*
254
347
* Helper function to insert pub and seckey to the engine keyring.
255
348
*/
256
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
257
350
int ret;
258
351
int fd;
259
352
gpgme_data_t pgp_data;
264
357
return false;
265
358
}
266
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
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
267
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
411
if(rc != GPG_ERR_NO_ERROR){
269
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
420
gpgme_strsource(rc), gpgme_strerror(rc));
278
421
return false;
279
422
}
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
}
280
498
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
282
500
if(ret == -1){
283
501
perror_plus("close");
284
502
}
323
541
/* Create new GPGME "context" */
324
542
rc = gpgme_new(&(mc->ctx));
325
543
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));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
329
546
return false;
330
547
}
331
548
340
557
* Decrypt OpenPGP data.
341
558
* Returns -1 on error
342
559
*/
560
__attribute__((nonnull, warn_unused_result))
343
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
562
size_t crypto_size,
345
563
char **plaintext,
366
584
/* Create new empty GPGME data buffer for the plaintext */
367
585
rc = gpgme_data_new(&dh_plain);
368
586
if(rc != GPG_ERR_NO_ERROR){
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
371
588
gpgme_strsource(rc), gpgme_strerror(rc));
372
589
gpgme_data_release(dh_crypto);
373
590
return -1;
386
603
if(result == NULL){
387
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
388
605
} else {
389
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
390
result->unsupported_algorithm);
391
fprintf_plus(stderr, "Wrong key usage: %u\n",
392
result->wrong_key_usage);
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");
393
612
if(result->file_name != NULL){
394
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
395
614
}
396
gpgme_recipient_t recipient;
397
recipient = result->recipients;
398
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
399
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name
401
(recipient->pubkey_algo));
402
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
403
621
fprintf_plus(stderr, "Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
406
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
407
623
}
408
624
}
409
625
}
465
681
return plaintext_length;
466
682
}
467
683
468
static const char * safer_gnutls_strerror(int value){
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){
469
693
const char *ret = gnutls_strerror(value);
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
694
return safe_string(ret);
473
695
}
474
696
475
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
476
699
static void debuggnutls(__attribute__((unused)) int level,
477
700
const char* string){
478
701
fprintf_plus(stderr, "GnuTLS: %s", string);
479
702
}
480
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
705
static int init_gnutls_global(const char *pubkeyfilename,
482
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
483
708
mandos_context *mc){
484
709
int ret;
485
710
487
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
488
713
}
489
714
490
ret = gnutls_global_init();
491
if(ret != GNUTLS_E_SUCCESS){
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
494
return -1;
495
}
496
497
715
if(debug){
498
716
/* "Use a log level over 10 to enable all debugging options."
499
717
* - GnuTLS manual
507
725
if(ret != GNUTLS_E_SUCCESS){
508
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
727
safer_gnutls_strerror(ret));
510
gnutls_global_deinit();
511
728
return -1;
512
729
}
513
730
514
731
if(debug){
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" secret key %s as GnuTLS credentials\n",
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
517
734
pubkeyfilename,
518
735
seckeyfilename);
519
736
}
520
737
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
521
751
ret = gnutls_certificate_set_openpgp_key_file
522
752
(mc->cred, pubkeyfilename, seckeyfilename,
523
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
524
757
if(ret != GNUTLS_E_SUCCESS){
525
758
fprintf_plus(stderr,
526
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
527
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
528
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
529
762
safer_gnutls_strerror(ret));
538
771
safer_gnutls_strerror(ret));
539
772
goto globalfail;
540
773
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
545
goto globalfail;
546
}
547
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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
}
549
956
550
957
return 0;
551
958
552
959
globalfail:
553
960
554
961
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_global_deinit();
556
962
gnutls_dh_params_deinit(mc->dh_params);
557
963
return -1;
558
964
}
559
965
966
__attribute__((nonnull, warn_unused_result))
560
967
static int init_gnutls_session(gnutls_session_t *session,
561
968
mandos_context *mc){
562
969
int ret;
563
970
/* GnuTLS session creation */
564
971
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
566
980
if(quit_now){
567
981
return -1;
568
982
}
609
1023
/* ignore client certificate if any. */
610
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
1025
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
613
614
1026
return 0;
615
1027
}
616
1028
618
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
619
1031
__attribute__((unused)) const char *txt){}
620
1032
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
close(devnull);
1078
_exit(EX_NOPERM);
1079
}
1080
/* Reset supplementary groups */
1081
errno = 0;
1082
ret = setgroups(0, NULL);
1083
if(ret == -1){
1084
perror_plus("setgroups");
1085
close(devnull);
1086
_exit(EX_NOPERM);
1087
}
1088
}
1089
ret = dup2(devnull, STDIN_FILENO);
1090
if(ret == -1){
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1092
close(devnull);
1093
_exit(EX_OSERR);
1094
}
1095
ret = close(devnull);
1096
if(ret == -1){
1097
perror_plus("close");
1098
}
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1100
if(ret == -1){
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1102
_exit(EX_OSERR);
1103
}
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1105
O_RDONLY
1106
| O_DIRECTORY
1107
| O_PATH
1108
| O_CLOEXEC));
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1112
}
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1114
helper, O_RDONLY));
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1119
}
1120
close(helperdir_fd);
1121
#ifdef __GNUC__
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1124
#endif
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1128
environ) == -1){
1129
#ifdef __GNUC__
1130
#pragma GCC diagnostic pop
1131
#endif
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1134
}
1135
}
1136
if(pid == -1){
1137
perror_plus("fork");
1138
close(devnull);
1139
return false;
1140
}
1141
ret = close(devnull);
1142
if(ret == -1){
1143
perror_plus("close");
1144
}
1145
int status;
1146
pid_t pret = -1;
1147
errno = 0;
1148
do {
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1156
}
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1159
}
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1162
" helper program");
1163
}
1164
return false;
1165
}
1166
} while(pret == -1 and errno == EINTR);
1167
if(pret == -1){
1168
perror_plus("waitpid");
1169
return false;
1170
}
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1175
return false;
1176
}
1177
return true;
1178
}
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1182
return false;
1183
}
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1185
return false;
1186
}
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1191
if(debug){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1193
}
1194
return add_delete_local_route(true, address, if_index);
1195
}
1196
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1200
if(debug){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1202
}
1203
return add_delete_local_route(false, address, if_index);
1204
}
1205
621
1206
/* Called when a Mandos server is found */
1207
__attribute__((nonnull, warn_unused_result))
622
1208
static int start_mandos_communication(const char *ip, in_port_t port,
623
1209
AvahiIfIndex if_index,
624
1210
int af, mandos_context *mc){
625
1211
int ret, tcp_sd = -1;
626
1212
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1213
struct sockaddr_storage to;
631
1214
char *buffer = NULL;
632
1215
char *decrypted_buffer = NULL;
633
1216
size_t buffer_length = 0;
636
1219
int retval = -1;
637
1220
gnutls_session_t session;
638
1221
int pf; /* Protocol family */
1222
bool route_added = false;
639
1223
640
1224
errno = 0;
641
1225
657
1241
return -1;
658
1242
}
659
1243
1244
/* If the interface is specified and we have a list of interfaces */
1245
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1246
/* Check if the interface is one of the interfaces we are using */
1247
bool match = false;
1248
{
1249
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1252
interface))){
1253
if(if_nametoindex(interface) == (unsigned int)if_index){
1254
match = true;
1255
break;
1256
}
1257
}
1258
}
1259
if(not match){
1260
/* This interface does not match any in the list, so we don't
1261
connect to the server */
1262
if(debug){
1263
char interface[IF_NAMESIZE];
1264
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1265
perror_plus("if_indextoname");
1266
} else {
1267
fprintf_plus(stderr, "Skipping server on non-used interface"
1268
" \"%s\"\n",
1269
if_indextoname((unsigned int)if_index,
1270
interface));
1271
}
1272
}
1273
return -1;
1274
}
1275
}
1276
660
1277
ret = init_gnutls_session(&session, mc);
661
1278
if(ret != 0){
662
1279
return -1;
667
1284
PRIuMAX "\n", ip, (uintmax_t)port);
668
1285
}
669
1286
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
671
1288
if(tcp_sd < 0){
672
1289
int e = errno;
673
1290
perror_plus("socket");
680
1297
goto mandos_end;
681
1298
}
682
1299
683
memset(&to, 0, sizeof(to));
684
1300
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
687
1304
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
690
1308
}
691
1309
if(ret < 0 ){
692
1310
int e = errno;
701
1319
goto mandos_end;
702
1320
}
703
1321
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
1325
if(if_index == AVAHI_IF_UNSPEC){
709
1326
fprintf_plus(stderr, "An IPv6 link-local address is"
710
1327
" incomplete without a network interface\n");
712
1329
goto mandos_end;
713
1330
}
714
1331
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
1333
}
717
1334
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
1336
}
722
1337
723
1338
if(quit_now){
740
1355
}
741
1356
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
1357
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
747
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
750
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
757
}
758
}
759
760
if(quit_now){
761
errno = EINTR;
762
goto mandos_end;
763
}
764
765
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
767
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
}
770
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
776
goto mandos_end;
777
}
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
1358
if(af == AF_INET6){
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
1361
addrstr, sizeof(addrstr), NULL, 0,
1362
NI_NUMERICHOST);
1363
} else {
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
1366
addrstr, sizeof(addrstr), NULL, 0,
1367
NI_NUMERICHOST);
1368
}
1369
if(ret == EAI_SYSTEM){
1370
perror_plus("getnameinfo");
1371
} else if(ret != 0) {
1372
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1373
} else if(strcmp(addrstr, ip) != 0){
1374
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1375
}
1376
}
1377
1378
if(quit_now){
1379
errno = EINTR;
1380
goto mandos_end;
1381
}
1382
1383
while(true){
1384
if(af == AF_INET6){
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1387
} else {
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1390
}
1391
if(ret < 0){
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1398
&to)->sin6_addr)))
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1409
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1413
*/
1414
if(debug){
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1416
" direct route\n");
1417
}
1418
int e = errno;
1419
route_added = add_local_route(ip, if_index);
1420
if(route_added){
1421
continue;
1422
}
1423
errno = e;
1424
}
1425
if(errno != ECONNREFUSED or debug){
1426
int e = errno;
1427
perror_plus("connect");
1428
errno = e;
1429
}
1430
goto mandos_end;
1431
}
1432
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
break;
782
1438
}
783
1439
784
1440
const char *out = mandos_protocol_version;
938
1594
&decrypted_buffer, mc);
939
1595
if(decrypted_buffer_size >= 0){
940
1596
1597
clearerr(stdout);
941
1598
written = 0;
942
1599
while(written < (size_t) decrypted_buffer_size){
943
1600
if(quit_now){
959
1616
}
960
1617
written += (size_t)ret;
961
1618
}
1619
ret = fflush(stdout);
1620
if(ret != 0){
1621
int e = errno;
1622
if(debug){
1623
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1624
strerror(errno));
1625
}
1626
errno = e;
1627
goto mandos_end;
1628
}
962
1629
retval = 0;
963
1630
}
964
1631
}
967
1634
968
1635
mandos_end:
969
1636
{
1637
if(route_added){
1638
if(not delete_local_route(ip, if_index)){
1639
fprintf_plus(stderr, "Failed to delete local route to %s on"
1640
" interface %d", ip, if_index);
1641
}
1642
}
970
1643
int e = errno;
971
1644
free(decrypted_buffer);
972
1645
free(buffer);
973
1646
if(tcp_sd >= 0){
974
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
ret = close(tcp_sd);
975
1648
}
976
1649
if(ret == -1){
977
1650
if(e == 0){
1002
1675
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1676
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1677
flags,
1005
void* mc){
1678
void *mc){
1006
1679
if(r == NULL){
1007
1680
return;
1008
1681
}
1011
1684
timed out */
1012
1685
1013
1686
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1014
1688
return;
1015
1689
}
1016
1690
1061
1735
const char *domain,
1062
1736
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1737
flags,
1064
void* mc){
1738
void *mc){
1065
1739
if(b == NULL){
1066
1740
return;
1067
1741
}
1127
1801
errno = old_errno;
1128
1802
}
1129
1803
1804
__attribute__((nonnull, warn_unused_result))
1130
1805
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
1806
int ret;
1132
error_t ret_errno;
1807
int old_errno;
1133
1808
1134
1809
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
1810
if(s < 0){
1136
ret_errno = errno;
1811
old_errno = errno;
1137
1812
perror_plus("socket");
1138
errno = ret_errno;
1813
errno = old_errno;
1139
1814
return false;
1140
1815
}
1141
strcpy(ifr->ifr_name, ifname);
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1142
1818
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
1819
if(ret == -1){
1144
1820
if(debug){
1145
ret_errno = errno;
1821
old_errno = errno;
1146
1822
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1823
errno = old_errno;
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1148
1829
}
1149
1830
return false;
1150
1831
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1151
1837
return true;
1152
1838
}
1153
1839
1840
__attribute__((nonnull, warn_unused_result))
1154
1841
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1842
1156
1843
/* Reject the loopback device */
1198
1885
* corresponds to an acceptable network device.
1199
1886
* (This function is passed to scandir(3) as a filter function.)
1200
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1201
1889
int good_interface(const struct dirent *if_entry){
1202
1890
if(if_entry->d_name[0] == '.'){
1203
1891
return 0;
1221
1909
/*
1222
1910
* This function determines if a network interface is up.
1223
1911
*/
1912
__attribute__((nonnull, warn_unused_result))
1224
1913
bool interface_is_up(const char *interface){
1225
1914
struct ifreq ifr;
1226
1915
if(not get_flags(interface, &ifr)){
1237
1926
/*
1238
1927
* This function determines if a network interface is running
1239
1928
*/
1929
__attribute__((nonnull, warn_unused_result))
1240
1930
bool interface_is_running(const char *interface){
1241
1931
struct ifreq ifr;
1242
1932
if(not get_flags(interface, &ifr)){
1250
1940
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
1941
}
1252
1942
1943
__attribute__((nonnull, pure, warn_unused_result))
1253
1944
int notdotentries(const struct dirent *direntry){
1254
1945
/* Skip "." and ".." */
1255
1946
if(direntry->d_name[0] == '.'
1262
1953
}
1263
1954
1264
1955
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1265
1957
int runnable_hook(const struct dirent *direntry){
1266
1958
int ret;
1267
1959
size_t sret;
1275
1967
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
1968
"abcdefghijklmnopqrstuvwxyz"
1277
1969
"0123456789"
1278
"_-");
1970
"_.-");
1279
1971
if((direntry->d_name)[sret] != '\0'){
1280
1972
/* Contains non-allowed characters */
1281
1973
if(debug){
1285
1977
return 0;
1286
1978
}
1287
1979
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1296
1981
if(ret == -1){
1297
1982
if(debug){
1298
1983
perror_plus("Could not stat hook");
1322
2007
return 1;
1323
2008
}
1324
2009
2010
__attribute__((nonnull, warn_unused_result))
1325
2011
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
2012
mandos_context *mc){
1327
2013
int ret;
1331
2017
1332
2018
while(true){
1333
2019
if(mc->current_server == NULL){
1334
if (debug){
2020
if(debug){
1335
2021
fprintf_plus(stderr, "Wait until first server is found."
1336
2022
" No timeout!\n");
1337
2023
}
1338
2024
ret = avahi_simple_poll_iterate(s, -1);
1339
2025
} else {
1340
if (debug){
2026
if(debug){
1341
2027
fprintf_plus(stderr, "Check current_server if we should run"
1342
2028
" it, or wait\n");
1343
2029
}
1360
2046
- ((intmax_t)waited_time.tv_sec * 1000))
1361
2047
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
2048
1363
if (debug){
2049
if(debug){
1364
2050
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
2051
block_time);
1366
2052
}
1388
2074
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
2075
}
1390
2076
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
2077
if(ret > 0 or errno != EINTR){
1392
2078
return (ret != 1) ? ret : 0;
1393
2079
}
1394
2080
}
1395
2081
}
1396
2082
}
1397
2083
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
1451
2086
const float delay){
1452
struct dirent **direntries;
2087
struct dirent **direntries = NULL;
2088
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2090
| O_CLOEXEC);
2091
if(hookdir_fd == -1){
2092
if(errno == ENOENT){
2093
if(debug){
2094
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2095
" found\n", hookdir);
2096
}
2097
} else {
2098
perror_plus("open");
2099
}
2100
return;
2101
}
2102
}
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
if(devnull == -1){
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2106
return;
2107
}
2108
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
runnable_hook, alphasort);
2110
if(numhooks == -1){
2111
perror_plus("scandir");
2112
close(devnull);
2113
return;
2114
}
1453
2115
struct dirent *direntry;
1454
2116
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
2117
for(int i = 0; i < numhooks; i++){
2118
direntry = direntries[i];
2119
if(debug){
2120
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2121
direntry->d_name);
1465
2122
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
2123
pid_t hook_pid = fork();
2124
if(hook_pid == 0){
2125
/* Child */
2126
/* Raise privileges */
2127
errno = raise_privileges_permanently();
2128
if(errno != 0){
2129
perror_plus("Failed to raise privileges");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Set group */
2133
errno = 0;
2134
ret = setgid(0);
2135
if(ret == -1){
2136
perror_plus("setgid");
2137
_exit(EX_NOPERM);
2138
}
2139
/* Reset supplementary groups */
2140
errno = 0;
2141
ret = setgroups(0, NULL);
2142
if(ret == -1){
2143
perror_plus("setgroups");
2144
_exit(EX_NOPERM);
2145
}
2146
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2147
if(ret == -1){
2148
perror_plus("setenv");
2149
_exit(EX_OSERR);
2150
}
2151
ret = setenv("DEVICE", interface, 1);
2152
if(ret == -1){
2153
perror_plus("setenv");
2154
_exit(EX_OSERR);
2155
}
2156
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2157
if(ret == -1){
2158
perror_plus("setenv");
2159
_exit(EX_OSERR);
2160
}
2161
ret = setenv("MODE", mode, 1);
2162
if(ret == -1){
2163
perror_plus("setenv");
2164
_exit(EX_OSERR);
2165
}
2166
char *delaystring;
2167
ret = asprintf(&delaystring, "%f", (double)delay);
2168
if(ret == -1){
1473
2169
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
2170
_exit(EX_OSERR);
2171
}
2172
ret = setenv("DELAY", delaystring, 1);
2173
if(ret == -1){
1532
2174
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
free(delaystring);
2179
if(connect_to != NULL){
2180
ret = setenv("CONNECT", connect_to, 1);
2181
if(ret == -1){
2182
perror_plus("setenv");
2183
_exit(EX_OSERR);
2184
}
2185
}
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2187
direntry->d_name,
2188
O_RDONLY));
2189
if(hook_fd == -1){
2190
perror_plus("openat");
2191
_exit(EXIT_FAILURE);
2192
}
2193
if(close(hookdir_fd) == -1){
2194
perror_plus("close");
2195
_exit(EXIT_FAILURE);
2196
}
2197
ret = dup2(devnull, STDIN_FILENO);
2198
if(ret == -1){
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2200
_exit(EX_OSERR);
2201
}
2202
ret = close(devnull);
2203
if(ret == -1){
2204
perror_plus("close");
2205
_exit(EX_OSERR);
2206
}
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2208
if(ret == -1){
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2210
_exit(EX_OSERR);
2211
}
2212
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2213
environ) == -1){
2214
perror_plus("fexecve");
2215
_exit(EXIT_FAILURE);
2216
}
2217
} else {
2218
if(hook_pid == -1){
2219
perror_plus("fork");
2220
free(direntry);
2221
continue;
2222
}
2223
int status;
2224
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
perror_plus("waitpid");
2226
free(direntry);
2227
continue;
2228
}
2229
if(WIFEXITED(status)){
2230
if(WEXITSTATUS(status) != 0){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
" with status %d\n", direntry->d_name,
2233
WEXITSTATUS(status));
2234
free(direntry);
2235
continue;
2236
}
2237
} else if(WIFSIGNALED(status)){
2238
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
" signal %d\n", direntry->d_name,
2240
WTERMSIG(status));
2241
free(direntry);
2242
continue;
1544
2243
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
2244
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
" crashed\n", direntry->d_name);
2246
free(direntry);
2247
continue;
2248
}
2249
}
2250
if(debug){
2251
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2252
direntry->d_name);
2253
}
2254
free(direntry);
2255
}
2256
free(direntries);
2257
if(close(hookdir_fd) == -1){
2258
perror_plus("close");
2259
} else {
2260
hookdir_fd = -1;
2261
}
2262
close(devnull);
1581
2263
}
1582
2264
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
2265
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2267
const float delay){
2268
int old_errno = errno;
2269
int ret;
1589
2270
struct ifreq network;
1590
2271
unsigned int if_index = if_nametoindex(interface);
1591
2272
if(if_index == 0){
1600
2281
}
1601
2282
1602
2283
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
2284
int ret_errno = 0;
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
1604
2287
ret_errno = errno;
1605
2288
fprintf_plus(stderr, "Failed to get flags for interface "
1606
2289
"\"%s\"\n", interface);
2290
errno = old_errno;
1607
2291
return ret_errno;
1608
2292
}
1609
network.ifr_flags |= IFF_UP;
2293
network.ifr_flags |= IFF_UP; /* set flag */
1610
2294
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2296
if(sd == -1){
1613
2297
ret_errno = errno;
1614
2298
perror_plus("socket");
1615
2299
errno = old_errno;
1616
2300
return ret_errno;
1617
2301
}
1618
2302
1619
2303
if(quit_now){
1620
close(sd);
2304
ret = close(sd);
2305
if(ret == -1){
2306
perror_plus("close");
2307
}
1621
2308
errno = old_errno;
1622
2309
return EINTR;
1623
2310
}
1627
2314
interface);
1628
2315
}
1629
2316
1630
/* Raise priviliges */
1631
raise_privileges();
2317
/* Raise privileges */
2318
ret_errno = raise_privileges();
2319
if(ret_errno != 0){
2320
errno = ret_errno;
2321
perror_plus("Failed to raise privileges");
2322
}
1632
2323
1633
2324
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
2325
int ret_linux;
2326
bool restore_loglevel = false;
2327
if(ret_errno == 0){
2328
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2329
messages about the network interface to mess up the prompt */
2330
ret_linux = klogctl(8, NULL, 5);
2331
if(ret_linux == -1){
2332
perror_plus("klogctl");
2333
} else {
2334
restore_loglevel = true;
2335
}
1641
2336
}
1642
2337
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
1645
2340
#ifdef __linux__
1646
2341
if(restore_loglevel){
1647
2342
ret_linux = klogctl(7, NULL, 0);
1651
2346
}
1652
2347
#endif /* __linux__ */
1653
2348
1654
/* Lower privileges */
1655
lower_privileges();
2349
/* If raise_privileges() succeeded above */
2350
if(ret_errno == 0){
2351
/* Lower privileges */
2352
ret_errno = lower_privileges();
2353
if(ret_errno != 0){
2354
errno = ret_errno;
2355
perror_plus("Failed to lower privileges");
2356
}
2357
}
1656
2358
1657
2359
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2360
ret = close(sd);
1659
2361
if(ret == -1){
1660
2362
perror_plus("close");
1661
2363
}
1662
2364
1663
2365
if(ret_setflags == -1){
1664
errno = ret_errno;
2366
errno = ioctl_errno;
1665
2367
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
2368
errno = old_errno;
1667
return ret_errno;
2369
return ioctl_errno;
1668
2370
}
1669
2371
} else if(debug){
1670
2372
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
2375
1674
2376
/* Sleep checking until interface is running.
1675
2377
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
2378
for(int i = 0; i < delay * 4; i++){
1677
2379
if(interface_is_running(interface)){
1678
2380
break;
1679
2381
}
1688
2390
return 0;
1689
2391
}
1690
2392
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
1696
2396
struct ifreq network;
1697
2397
unsigned int if_index = if_nametoindex(interface);
1698
2398
if(if_index == 0){
1701
2401
return ENXIO;
1702
2402
}
1703
2403
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
1704
2406
if(not get_flags(interface, &network) and debug){
1705
2407
ret_errno = errno;
1706
2408
fprintf_plus(stderr, "Failed to get flags for interface "
1707
2409
"\"%s\"\n", interface);
2410
errno = old_errno;
1708
2411
return ret_errno;
1709
2412
}
1710
2413
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
2414
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2416
if(sd == -1){
1714
2417
ret_errno = errno;
1715
2418
perror_plus("socket");
1716
2419
errno = old_errno;
1722
2425
interface);
1723
2426
}
1724
2427
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
2428
/* Raise privileges */
2429
ret_errno = raise_privileges();
2430
if(ret_errno != 0){
2431
errno = ret_errno;
2432
perror_plus("Failed to raise privileges");
2433
}
2434
2435
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
2437
2438
/* If raise_privileges() succeeded above */
2439
if(ret_errno == 0){
2440
/* Lower privileges */
2441
ret_errno = lower_privileges();
2442
if(ret_errno != 0){
2443
errno = ret_errno;
2444
perror_plus("Failed to lower privileges");
2445
}
2446
}
1733
2447
1734
2448
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2449
int ret = close(sd);
1736
2450
if(ret == -1){
1737
2451
perror_plus("close");
1738
2452
}
1739
2453
1740
2454
if(ret_setflags == -1){
1741
errno = ret_errno;
2455
errno = ioctl_errno;
1742
2456
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
2457
errno = old_errno;
1744
return ret_errno;
2458
return ioctl_errno;
1745
2459
}
1746
2460
} else if(debug){
1747
2461
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1753
2467
}
1754
2468
1755
2469
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
":%PROFILE_ULTRA",
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#else
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
#endif
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
1759
2483
AvahiSServiceBrowser *sb = NULL;
1760
2484
error_t ret_errno;
1761
2485
int ret;
1762
2486
intmax_t tmpmax;
1763
2487
char *tmp;
1764
2488
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
2489
char *interfaces_to_take_down = NULL;
1768
2490
size_t interfaces_to_take_down_size = 0;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
1771
2494
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
2495
const char *seckey = PATHDIR "/" SECKEY;
1773
2496
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2500
#endif
2501
const char *dh_params_file = NULL;
1774
2502
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
2503
1777
2504
bool gnutls_initialized = false;
1778
2505
bool gpgme_initialized = false;
1824
2551
{ .name = "pubkey", .key = 'p',
1825
2552
.arg = "FILE",
1826
2553
.doc = "OpenPGP public key file base name",
1827
.group = 2 },
2554
.group = 1 },
2555
{ .name = "tls-privkey", .key = 't',
2556
.arg = "FILE",
2557
#if GNUTLS_VERSION_NUMBER >= 0x030606
2558
.doc = "TLS private key file base name",
2559
#else
2560
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2561
#endif
2562
.group = 1 },
2563
{ .name = "tls-pubkey", .key = 'T',
2564
.arg = "FILE",
2565
#if GNUTLS_VERSION_NUMBER >= 0x030606
2566
.doc = "TLS public key file base name",
2567
#else
2568
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2569
#endif
2570
.group = 1 },
1828
2571
{ .name = "dh-bits", .key = 129,
1829
2572
.arg = "BITS",
1830
2573
.doc = "Bit length of the prime number used in the"
1831
2574
" Diffie-Hellman key exchange",
1832
2575
.group = 2 },
2576
{ .name = "dh-params", .key = 134,
2577
.arg = "FILE",
2578
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2579
" for the Diffie-Hellman key exchange",
2580
.group = 2 },
1833
2581
{ .name = "priority", .key = 130,
1834
2582
.arg = "STRING",
1835
2583
.doc = "GnuTLS priority string for the TLS handshake",
1869
2617
connect_to = arg;
1870
2618
break;
1871
2619
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
2620
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2621
arg, (int)',');
1874
2622
if(ret_errno != 0){
1875
2623
argp_error(state, "%s", strerror(ret_errno));
1876
2624
}
1881
2629
case 'p': /* --pubkey */
1882
2630
pubkey = arg;
1883
2631
break;
2632
case 't': /* --tls-privkey */
2633
#if GNUTLS_VERSION_NUMBER >= 0x030606
2634
tls_privkey = arg;
2635
#endif
2636
break;
2637
case 'T': /* --tls-pubkey */
2638
#if GNUTLS_VERSION_NUMBER >= 0x030606
2639
tls_pubkey = arg;
2640
#endif
2641
break;
1884
2642
case 129: /* --dh-bits */
1885
2643
errno = 0;
1886
2644
tmpmax = strtoimax(arg, &tmp, 10);
1890
2648
}
1891
2649
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1892
2650
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
1893
2654
case 130: /* --priority */
1894
2655
mc.priority = arg;
1895
2656
break;
1918
2679
argp_state_help(state, state->out_stream,
1919
2680
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1920
2681
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
1921
2683
case -3: /* --usage */
1922
2684
argp_state_help(state, state->out_stream,
1923
2685
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
1924
2687
case 'V': /* --version */
1925
2688
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1926
2689
exit(argp_err_exit_status);
1935
2698
.args_doc = "",
1936
2699
.doc = "Mandos client -- Get and decrypt"
1937
2700
" passwords from a Mandos server" };
1938
ret = argp_parse(&argp, argc, argv,
1939
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1940
switch(ret){
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2703
switch(ret_errno){
1941
2704
case 0:
1942
2705
break;
1943
2706
case ENOMEM:
1944
2707
default:
1945
errno = ret;
2708
errno = ret_errno;
1946
2709
perror_plus("argp_parse");
1947
2710
exitcode = EX_OSERR;
1948
2711
goto end;
1951
2714
goto end;
1952
2715
}
1953
2716
}
1954
2717
1955
2718
{
1956
2719
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
2720
<https://bugs.debian.org/633582> */
1958
2721
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2724
if(ret != 0){
2725
errno = ret;
2726
perror_plus("Failed to raise privileges");
2727
} else {
1961
2728
struct stat st;
1962
2729
1963
2730
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1977
2744
}
1978
2745
}
1979
2746
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
close(seckey_fd);
1981
2748
}
1982
2749
}
1983
2750
1984
2751
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
2752
int pubkey_fd = open(pubkey, O_RDONLY);
1986
2753
if(pubkey_fd == -1){
1998
2765
}
1999
2766
}
2000
2767
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2768
close(pubkey_fd);
2769
}
2770
}
2771
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2777
} else {
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2779
if(ret == -1){
2780
perror_plus("fstat");
2781
} else {
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2785
if(ret == -1){
2786
perror_plus("fchown");
2787
}
2788
}
2789
}
2790
close(dhparams_fd);
2791
}
2792
}
2793
2005
2794
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2798
perror_plus("Failed to lower privileges");
2010
2799
}
2011
2800
}
2012
2801
}
2013
2802
2014
/* Remove empty interface names */
2803
/* Remove invalid interface names (except "none") */
2015
2804
{
2016
2805
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2806
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2018
2807
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2808
if(strcmp(interface, "none") != 0
2809
and if_nametoindex(interface) == 0){
2810
if(interface[0] != '\0'){
2021
2811
fprintf_plus(stderr, "Not using nonexisting interface"
2022
2812
" \"%s\"\n", interface);
2023
2813
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2814
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2025
2815
interface = NULL;
2026
2816
}
2027
2817
}
2029
2819
2030
2820
/* Run network hooks */
2031
2821
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2822
if(mc.interfaces != NULL){
2823
interfaces_hooks = malloc(mc.interfaces_size);
2035
2824
if(interfaces_hooks == NULL){
2036
2825
perror_plus("malloc");
2037
2826
goto end;
2038
2827
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2828
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2829
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2830
}
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
2048
2833
}
2049
2834
2050
2835
if(not debug){
2127
2912
}
2128
2913
2129
2914
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2915
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2132
2917
/* Look for any good interfaces */
2133
2918
ret = scandir(sys_class_net, &direntries, good_interface,
2134
2919
alphasort);
2135
2920
if(ret >= 1){
2136
2921
/* Add all found interfaces to interfaces list */
2137
2922
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2923
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2139
2924
direntries[i]->d_name);
2140
2925
if(ret_errno != 0){
2926
errno = ret_errno;
2141
2927
perror_plus("argz_add");
2928
free(direntries[i]);
2142
2929
continue;
2143
2930
}
2144
2931
if(debug){
2145
2932
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
2933
direntries[i]->d_name);
2147
2934
}
2935
free(direntries[i]);
2148
2936
}
2149
2937
free(direntries);
2150
2938
} else {
2151
free(direntries);
2939
if(ret == 0){
2940
free(direntries);
2941
}
2152
2942
fprintf_plus(stderr, "Could not find a network interface\n");
2153
2943
exitcode = EXIT_FAILURE;
2154
2944
goto end;
2155
2945
}
2156
2946
}
2157
2947
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2948
/* Bring up interfaces which are down, and remove any "none"s */
2949
{
2170
2950
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2951
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2172
2952
interface))){
2953
/* If interface name is "none", stop bringing up interfaces.
2954
Also remove all instances of "none" from the list */
2955
if(strcmp(interface, "none") == 0){
2956
argz_delete(&mc.interfaces, &mc.interfaces_size,
2957
interface);
2958
interface = NULL;
2959
while((interface = argz_next(mc.interfaces,
2960
mc.interfaces_size, interface))){
2961
if(strcmp(interface, "none") == 0){
2962
argz_delete(&mc.interfaces, &mc.interfaces_size,
2963
interface);
2964
interface = NULL;
2965
}
2966
}
2967
break;
2968
}
2173
2969
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2970
errno = bring_up_interface(interface, delay);
2175
2971
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2972
if(errno != 0){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2179
2975
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2978
interface);
2979
if(errno != 0){
2980
perror_plus("argz_add");
2981
}
2183
2982
}
2184
2983
}
2185
2984
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
2985
if(debug and (interfaces_to_take_down == NULL)){
2190
2986
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
2987
}
2192
2988
}
2193
2989
2990
/* If we only got one interface, explicitly use only that one */
2991
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2992
if(debug){
2993
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2994
mc.interfaces);
2995
}
2996
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2997
}
2998
2194
2999
if(quit_now){
2195
3000
goto end;
2196
3001
}
2197
3002
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3007
#else
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3009
#endif
2199
3010
if(ret == -1){
2200
3011
fprintf_plus(stderr, "init_gnutls_global failed\n");
2201
3012
exitcode = EX_UNAVAILABLE;
2208
3019
goto end;
2209
3020
}
2210
3021
2211
if(mkdtemp(tempdir) == NULL){
3022
/* Try /run/tmp before /tmp */
3023
tempdir = mkdtemp(run_tempdir);
3024
if(tempdir == NULL and errno == ENOENT){
3025
if(debug){
3026
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3027
run_tempdir, old_tempdir);
3028
}
3029
tempdir = mkdtemp(old_tempdir);
3030
}
3031
if(tempdir == NULL){
2212
3032
perror_plus("mkdtemp");
2213
3033
goto end;
2214
3034
}
2215
tempdir_created = true;
2216
3035
2217
3036
if(quit_now){
2218
3037
goto end;
2254
3073
exitcode = EX_USAGE;
2255
3074
goto end;
2256
3075
}
2257
3076
2258
3077
if(quit_now){
2259
3078
goto end;
2260
3079
}
2290
3109
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
3110
(int)retry_interval);
2292
3111
}
2293
sleep((int)retry_interval);
3112
sleep((unsigned int)retry_interval);
2294
3113
}
2295
3114
2296
if (not quit_now){
3115
if(not quit_now){
2297
3116
exitcode = EXIT_SUCCESS;
2298
3117
}
2299
3118
2315
3134
2316
3135
/* Allocate a new server */
2317
3136
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
3137
&config, NULL, NULL, &ret);
2319
3138
2320
3139
/* Free the Avahi configuration data */
2321
3140
avahi_server_config_free(&config);
2324
3143
/* Check if creating the Avahi server object succeeded */
2325
3144
if(mc.server == NULL){
2326
3145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
3146
avahi_strerror(ret));
2328
3147
exitcode = EX_UNAVAILABLE;
2329
3148
goto end;
2330
3149
}
2354
3173
if(debug){
2355
3174
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
3175
}
2357
3176
2358
3177
ret = avahi_loop_with_timeout(simple_poll,
2359
3178
(int)(retry_interval * 1000), &mc);
2360
3179
if(debug){
2365
3184
end:
2366
3185
2367
3186
if(debug){
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
if(signal_received){
3188
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3189
argv[0], signal_received,
3190
strsignal(signal_received));
3191
} else {
3192
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
}
2369
3194
}
2370
3195
2371
3196
/* Cleanup things */
3197
free(mc.interfaces);
3198
2372
3199
if(sb != NULL)
2373
3200
avahi_s_service_browser_free(sb);
2374
3201
2380
3207
2381
3208
if(gnutls_initialized){
2382
3209
gnutls_certificate_free_credentials(mc.cred);
2383
gnutls_global_deinit();
2384
3210
gnutls_dh_params_deinit(mc.dh_params);
2385
3211
}
2386
3212
2394
3220
mc.current_server->prev->next = NULL;
2395
3221
while(mc.current_server != NULL){
2396
3222
server *next = mc.current_server->next;
3223
#ifdef __GNUC__
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3226
#endif
3227
free((char *)(mc.current_server->ip));
3228
#ifdef __GNUC__
3229
#pragma GCC diagnostic pop
3230
#endif
2397
3231
free(mc.current_server);
2398
3232
mc.current_server = next;
2399
3233
}
2400
3234
}
2401
3235
2402
/* Re-raise priviliges */
3236
/* Re-raise privileges */
2403
3237
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
2420
}
2421
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
2425
}
2426
}
2427
2428
lower_privileges_permanently();
3238
ret = raise_privileges();
3239
if(ret != 0){
3240
errno = ret;
3241
perror_plus("Failed to raise privileges");
3242
} else {
3243
3244
/* Run network hooks */
3245
run_network_hooks("stop", interfaces_hooks != NULL ?
3246
interfaces_hooks : "", delay);
3247
3248
/* Take down the network interfaces which were brought up */
3249
{
3250
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3253
interface))){
3254
ret = take_down_interface(interface);
3255
if(ret != 0){
3256
errno = ret;
3257
perror_plus("Failed to take down interface");
3258
}
3259
}
3260
if(debug and (interfaces_to_take_down == NULL)){
3261
fprintf_plus(stderr, "No interfaces needed to be taken"
3262
" down\n");
3263
}
3264
}
3265
}
3266
3267
ret = lower_privileges_permanently();
3268
if(ret != 0){
3269
errno = ret;
3270
perror_plus("Failed to lower privileges permanently");
3271
}
2429
3272
}
2430
3273
2431
3274
free(interfaces_to_take_down);
2432
3275
free(interfaces_hooks);
2433
3276
3277
void clean_dir_at(int base, const char * const dirname,
3278
uintmax_t level){
3279
struct dirent **direntries = NULL;
3280
int dret;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3282
O_RDONLY
3283
| O_NOFOLLOW
3284
| O_DIRECTORY
3285
| O_PATH));
3286
if(dir_fd == -1){
3287
perror_plus("open");
3288
return;
3289
}
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
3293
for(int i = 0; i < numentries; i++){
3294
if(debug){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3297
}
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3299
if(dret == -1){
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3302
AT_REMOVEDIR);
3303
}
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3309
dret = 0;
3310
}
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3314
}
3315
}
3316
free(direntries[i]);
3317
}
3318
3319
/* need to clean even if 0 because man page doesn't specify */
3320
free(direntries);
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3324
}
3325
} else {
3326
perror_plus("scandirat");
3327
}
3328
close(dir_fd);
3329
}
3330
2434
3331
/* Removes the GPGME temp directory and all files inside */
2435
if(tempdir_created){
2436
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2445
direntry->d_name);
2446
if(ret < 0){
2447
perror_plus("asprintf");
2448
continue;
2449
}
2450
ret = remove(fullname);
2451
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
2454
}
2455
free(fullname);
2456
}
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
2463
}
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
2467
}
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
2468
3334
}
2469
3335
2470
3336
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0