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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
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 <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
154
173
155
174
/* Used for passing in values through the Avahi callback functions */
156
175
typedef struct {
157
AvahiSimplePoll *simple_poll;
158
176
AvahiServer *server;
159
177
gnutls_certificate_credentials_t cred;
160
178
unsigned int dh_bits;
162
180
const char *priority;
163
181
gpgme_ctx_t ctx;
164
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
165
185
} mandos_context;
166
186
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
172
189
173
190
sig_atomic_t quit_now = 0;
174
191
int signal_received = 0;
182
199
perror(print_text);
183
200
}
184
201
185
__attribute__((format (gnu_printf, 2, 3)))
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
203
int fprintf_plus(FILE *stream, const char *format, ...){
187
204
va_list ap;
188
205
va_start (ap, format);
189
206
190
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
208
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
210
}
194
211
195
212
/*
197
214
* bytes. "buffer_capacity" is how much is currently allocated,
198
215
* "buffer_length" is how much is already used.
199
216
*/
217
__attribute__((nonnull, warn_unused_result))
200
218
size_t incbuffer(char **buffer, size_t buffer_length,
201
219
size_t buffer_capacity){
202
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
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;
205
227
return 0;
206
228
}
229
*buffer = new_buf;
207
230
buffer_capacity += BUFFER_SIZE;
208
231
}
209
232
return buffer_capacity;
210
233
}
211
234
212
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
213
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
238
int af, server **current_server){
215
239
int ret;
216
240
server *new_server = malloc(sizeof(server));
217
241
if(new_server == NULL){
224
248
.af = af };
225
249
if(new_server->ip == NULL){
226
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);
227
266
return false;
228
267
}
229
268
/* Special case of first server */
230
if (mc.current_server == NULL){
269
if(*current_server == NULL){
231
270
new_server->next = new_server;
232
271
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
272
*current_server = new_server;
235
273
} else {
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
238
277
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
278
(*current_server)->prev = new_server;
245
279
}
246
280
return true;
247
281
}
248
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
249
335
/*
250
336
* Initialize GPGME.
251
337
*/
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
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){
254
343
gpgme_error_t rc;
255
344
gpgme_engine_info_t engine_info;
256
345
257
258
346
/*
259
347
* Helper function to insert pub and seckey to the engine keyring.
260
348
*/
261
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
262
350
int ret;
263
351
int fd;
264
352
gpgme_data_t pgp_data;
269
357
return false;
270
358
}
271
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
272
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
273
411
if(rc != GPG_ERR_NO_ERROR){
274
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
414
return false;
277
415
}
278
416
279
rc = gpgme_op_import(mc.ctx, pgp_data);
417
rc = gpgme_op_import(mc->ctx, pgp_data);
280
418
if(rc != GPG_ERR_NO_ERROR){
281
419
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
420
gpgme_strsource(rc), gpgme_strerror(rc));
283
421
return false;
284
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
}
285
498
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
ret = close(fd);
287
500
if(ret == -1){
288
501
perror_plus("close");
289
502
}
326
539
}
327
540
328
541
/* Create new GPGME "context" */
329
rc = gpgme_new(&(mc.ctx));
542
rc = gpgme_new(&(mc->ctx));
330
543
if(rc != GPG_ERR_NO_ERROR){
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
334
546
return false;
335
547
}
336
548
345
557
* Decrypt OpenPGP data.
346
558
* Returns -1 on error
347
559
*/
560
__attribute__((nonnull, warn_unused_result))
348
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
349
562
size_t crypto_size,
350
char **plaintext){
563
char **plaintext,
564
mandos_context *mc){
351
565
gpgme_data_t dh_crypto, dh_plain;
352
566
gpgme_error_t rc;
353
567
ssize_t ret;
370
584
/* Create new empty GPGME data buffer for the plaintext */
371
585
rc = gpgme_data_new(&dh_plain);
372
586
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
375
588
gpgme_strsource(rc), gpgme_strerror(rc));
376
589
gpgme_data_release(dh_crypto);
377
590
return -1;
379
592
380
593
/* Decrypt data from the cryptotext data buffer to the plaintext
381
594
data buffer */
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
383
596
if(rc != GPG_ERR_NO_ERROR){
384
597
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
598
gpgme_strsource(rc), gpgme_strerror(rc));
386
599
plaintext_length = -1;
387
600
if(debug){
388
601
gpgme_decrypt_result_t result;
389
result = gpgme_op_decrypt_result(mc.ctx);
602
result = gpgme_op_decrypt_result(mc->ctx);
390
603
if(result == NULL){
391
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
392
605
} else {
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
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");
397
612
if(result->file_name != NULL){
398
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
399
614
}
400
gpgme_recipient_t recipient;
401
recipient = result->recipients;
402
while(recipient != NULL){
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
403
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
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);
407
621
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
410
recipient = recipient->next;
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
411
623
}
412
624
}
413
625
}
469
681
return plaintext_length;
470
682
}
471
683
472
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){
473
693
const char *ret = gnutls_strerror(value);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
694
return safe_string(ret);
477
695
}
478
696
479
697
/* GnuTLS log function callback */
698
__attribute__((nonnull))
480
699
static void debuggnutls(__attribute__((unused)) int level,
481
700
const char* string){
482
701
fprintf_plus(stderr, "GnuTLS: %s", string);
483
702
}
484
703
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
485
705
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
mandos_context *mc){
487
709
int ret;
488
710
489
711
if(debug){
490
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
713
}
492
714
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
497
return -1;
498
}
499
500
715
if(debug){
501
716
/* "Use a log level over 10 to enable all debugging options."
502
717
* - GnuTLS manual
506
721
}
507
722
508
723
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
725
if(ret != GNUTLS_E_SUCCESS){
511
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
727
safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
514
728
return -1;
515
729
}
516
730
517
731
if(debug){
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" 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",
520
734
pubkeyfilename,
521
735
seckeyfilename);
522
736
}
523
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
524
751
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
752
(mc->cred, pubkeyfilename, seckeyfilename,
526
753
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
527
757
if(ret != GNUTLS_E_SUCCESS){
528
758
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
"Error[%d] while reading the key pair ('%s',"
530
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
762
safer_gnutls_strerror(ret));
534
764
}
535
765
536
766
/* GnuTLS server initialization */
537
ret = gnutls_dh_params_init(&mc.dh_params);
767
ret = gnutls_dh_params_init(&mc->dh_params);
538
768
if(ret != GNUTLS_E_SUCCESS){
539
769
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
770
" initialization: %s\n",
541
771
safer_gnutls_strerror(ret));
542
772
goto globalfail;
543
773
}
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
548
goto globalfail;
549
}
550
551
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
}
552
956
553
957
return 0;
554
958
555
959
globalfail:
556
960
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
560
963
return -1;
561
964
}
562
965
563
static int init_gnutls_session(gnutls_session_t *session){
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
968
mandos_context *mc){
564
969
int ret;
565
970
/* GnuTLS session creation */
566
971
do {
567
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
));
568
980
if(quit_now){
569
981
return -1;
570
982
}
578
990
{
579
991
const char *err;
580
992
do {
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
994
if(quit_now){
583
995
gnutls_deinit(*session);
584
996
return -1;
595
1007
596
1008
do {
597
1009
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc.cred);
1010
mc->cred);
599
1011
if(quit_now){
600
1012
gnutls_deinit(*session);
601
1013
return -1;
611
1023
/* ignore client certificate if any. */
612
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
1025
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
616
1026
return 0;
617
1027
}
618
1028
620
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
1031
__attribute__((unused)) const char *txt){}
622
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
623
1206
/* Called when a Mandos server is found */
1207
__attribute__((nonnull, warn_unused_result))
624
1208
static int start_mandos_communication(const char *ip, in_port_t port,
625
1209
AvahiIfIndex if_index,
626
int af){
1210
int af, mandos_context *mc){
627
1211
int ret, tcp_sd = -1;
628
1212
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1213
struct sockaddr_storage to;
633
1214
char *buffer = NULL;
634
1215
char *decrypted_buffer = NULL;
635
1216
size_t buffer_length = 0;
638
1219
int retval = -1;
639
1220
gnutls_session_t session;
640
1221
int pf; /* Protocol family */
1222
bool route_added = false;
641
1223
642
1224
errno = 0;
643
1225
659
1241
return -1;
660
1242
}
661
1243
662
ret = init_gnutls_session(&session);
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
1277
ret = init_gnutls_session(&session, mc);
663
1278
if(ret != 0){
664
1279
return -1;
665
1280
}
669
1284
PRIuMAX "\n", ip, (uintmax_t)port);
670
1285
}
671
1286
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
673
1288
if(tcp_sd < 0){
674
1289
int e = errno;
675
1290
perror_plus("socket");
682
1297
goto mandos_end;
683
1298
}
684
1299
685
memset(&to, 0, sizeof(to));
686
1300
if(af == AF_INET6){
687
to.in6.sin6_family = (sa_family_t)af;
688
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);
689
1304
} else { /* IPv4 */
690
to.in.sin_family = (sa_family_t)af;
691
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);
692
1308
}
693
1309
if(ret < 0 ){
694
1310
int e = errno;
703
1319
goto mandos_end;
704
1320
}
705
1321
if(af == AF_INET6){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
710
1325
if(if_index == AVAHI_IF_UNSPEC){
711
1326
fprintf_plus(stderr, "An IPv6 link-local address is"
712
1327
" incomplete without a network interface\n");
714
1329
goto mandos_end;
715
1330
}
716
1331
/* Set the network interface number as scope */
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
1333
}
719
1334
} else {
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
723
1336
}
724
1337
725
1338
if(quit_now){
742
1355
}
743
1356
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
1357
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
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;
784
1438
}
785
1439
786
1440
const char *out = mandos_protocol_version;
937
1591
if(buffer_length > 0){
938
1592
ssize_t decrypted_buffer_size;
939
1593
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
940
&decrypted_buffer);
1594
&decrypted_buffer, mc);
941
1595
if(decrypted_buffer_size >= 0){
942
1596
1597
clearerr(stdout);
943
1598
written = 0;
944
1599
while(written < (size_t) decrypted_buffer_size){
945
1600
if(quit_now){
961
1616
}
962
1617
written += (size_t)ret;
963
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
}
964
1629
retval = 0;
965
1630
}
966
1631
}
969
1634
970
1635
mandos_end:
971
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
}
972
1643
int e = errno;
973
1644
free(decrypted_buffer);
974
1645
free(buffer);
975
1646
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
ret = close(tcp_sd);
977
1648
}
978
1649
if(ret == -1){
979
1650
if(e == 0){
1004
1675
AVAHI_GCC_UNUSED AvahiStringList *txt,
1005
1676
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1006
1677
flags,
1007
AVAHI_GCC_UNUSED void* userdata){
1678
void *mc){
1008
1679
if(r == NULL){
1009
1680
return;
1010
1681
}
1013
1684
timed out */
1014
1685
1015
1686
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1016
1688
return;
1017
1689
}
1018
1690
1022
1694
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
1695
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
1696
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
1697
avahi_strerror(avahi_server_errno
1698
(((mandos_context*)mc)->server)));
1026
1699
break;
1027
1700
1028
1701
case AVAHI_RESOLVER_FOUND:
1036
1709
}
1037
1710
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
1711
interface,
1039
avahi_proto_to_af(proto));
1712
avahi_proto_to_af(proto),
1713
mc);
1040
1714
if(ret == 0){
1041
avahi_simple_poll_quit(mc.simple_poll);
1715
avahi_simple_poll_quit(simple_poll);
1042
1716
} else {
1043
1717
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1718
avahi_proto_to_af(proto),
1719
&((mandos_context*)mc)->current_server)){
1045
1720
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
1721
" list\n", name);
1047
1722
}
1060
1735
const char *domain,
1061
1736
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
1737
flags,
1063
AVAHI_GCC_UNUSED void* userdata){
1738
void *mc){
1064
1739
if(b == NULL){
1065
1740
return;
1066
1741
}
1077
1752
case AVAHI_BROWSER_FAILURE:
1078
1753
1079
1754
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1755
avahi_strerror(avahi_server_errno
1756
(((mandos_context*)mc)->server)));
1757
avahi_simple_poll_quit(simple_poll);
1082
1758
return;
1083
1759
1084
1760
case AVAHI_BROWSER_NEW:
1087
1763
the callback function is called the Avahi server will free the
1088
1764
resolver for us. */
1089
1765
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1766
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1767
interface, protocol, name, type,
1768
domain, protocol, 0,
1769
resolve_callback, mc) == NULL)
1093
1770
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1771
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1772
avahi_strerror(avahi_server_errno
1773
(((mandos_context*)mc)->server)));
1096
1774
break;
1097
1775
1098
1776
case AVAHI_BROWSER_REMOVE:
1117
1795
signal_received = sig;
1118
1796
int old_errno = errno;
1119
1797
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1798
if(simple_poll != NULL){
1799
avahi_simple_poll_quit(simple_poll);
1122
1800
}
1123
1801
errno = old_errno;
1124
1802
}
1125
1803
1804
__attribute__((nonnull, warn_unused_result))
1126
1805
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1806
int ret;
1128
error_t ret_errno;
1807
int old_errno;
1129
1808
1130
1809
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
1810
if(s < 0){
1132
ret_errno = errno;
1811
old_errno = errno;
1133
1812
perror_plus("socket");
1134
errno = ret_errno;
1813
errno = old_errno;
1135
1814
return false;
1136
1815
}
1137
strcpy(ifr->ifr_name, ifname);
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1138
1818
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
1819
if(ret == -1){
1140
1820
if(debug){
1141
ret_errno = errno;
1821
old_errno = errno;
1142
1822
perror_plus("ioctl SIOCGIFFLAGS");
1143
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;
1144
1829
}
1145
1830
return false;
1146
1831
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1147
1837
return true;
1148
1838
}
1149
1839
1840
__attribute__((nonnull, warn_unused_result))
1150
1841
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1842
1152
1843
/* Reject the loopback device */
1194
1885
* corresponds to an acceptable network device.
1195
1886
* (This function is passed to scandir(3) as a filter function.)
1196
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1197
1889
int good_interface(const struct dirent *if_entry){
1198
1890
if(if_entry->d_name[0] == '.'){
1199
1891
return 0;
1217
1909
/*
1218
1910
* This function determines if a network interface is up.
1219
1911
*/
1912
__attribute__((nonnull, warn_unused_result))
1220
1913
bool interface_is_up(const char *interface){
1221
1914
struct ifreq ifr;
1222
1915
if(not get_flags(interface, &ifr)){
1233
1926
/*
1234
1927
* This function determines if a network interface is running
1235
1928
*/
1929
__attribute__((nonnull, warn_unused_result))
1236
1930
bool interface_is_running(const char *interface){
1237
1931
struct ifreq ifr;
1238
1932
if(not get_flags(interface, &ifr)){
1246
1940
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1941
}
1248
1942
1943
__attribute__((nonnull, pure, warn_unused_result))
1249
1944
int notdotentries(const struct dirent *direntry){
1250
1945
/* Skip "." and ".." */
1251
1946
if(direntry->d_name[0] == '.'
1258
1953
}
1259
1954
1260
1955
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1261
1957
int runnable_hook(const struct dirent *direntry){
1262
1958
int ret;
1263
1959
size_t sret;
1271
1967
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1968
"abcdefghijklmnopqrstuvwxyz"
1273
1969
"0123456789"
1274
"_-");
1970
"_.-");
1275
1971
if((direntry->d_name)[sret] != '\0'){
1276
1972
/* Contains non-allowed characters */
1277
1973
if(debug){
1281
1977
return 0;
1282
1978
}
1283
1979
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1981
if(ret == -1){
1293
1982
if(debug){
1294
1983
perror_plus("Could not stat hook");
1318
2007
return 1;
1319
2008
}
1320
2009
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2010
__attribute__((nonnull, warn_unused_result))
2011
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2012
mandos_context *mc){
1322
2013
int ret;
1323
2014
struct timespec now;
1324
2015
struct timespec waited_time;
1325
2016
intmax_t block_time;
1326
2017
1327
2018
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
2019
if(mc->current_server == NULL){
2020
if(debug){
1330
2021
fprintf_plus(stderr, "Wait until first server is found."
1331
2022
" No timeout!\n");
1332
2023
}
1333
2024
ret = avahi_simple_poll_iterate(s, -1);
1334
2025
} else {
1335
if (debug){
2026
if(debug){
1336
2027
fprintf_plus(stderr, "Check current_server if we should run"
1337
2028
" it, or wait\n");
1338
2029
}
1345
2036
/* Calculating in ms how long time between now and server
1346
2037
who we visted longest time ago. Now - last seen. */
1347
2038
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
2039
- mc->current_server->last_seen.tv_sec);
1349
2040
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
2041
- mc->current_server->last_seen.tv_nsec);
1351
2042
/* total time is 10s/10,000ms.
1352
2043
Converting to s from ms by dividing by 1,000,
1353
2044
and ns to ms by dividing by 1,000,000. */
1355
2046
- ((intmax_t)waited_time.tv_sec * 1000))
1356
2047
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
2048
1358
if (debug){
2049
if(debug){
1359
2050
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
2051
block_time);
1361
2052
}
1362
2053
1363
2054
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
2055
ret = start_mandos_communication(mc->current_server->ip,
2056
mc->current_server->port,
2057
mc->current_server->if_index,
2058
mc->current_server->af, mc);
1368
2059
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
2060
avahi_simple_poll_quit(s);
1370
2061
return 0;
1371
2062
}
1372
2063
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
2064
&mc->current_server->last_seen);
1374
2065
if(ret == -1){
1375
2066
perror_plus("clock_gettime");
1376
2067
return -1;
1377
2068
}
1378
mc.current_server = mc.current_server->next;
2069
mc->current_server = mc->current_server->next;
1379
2070
block_time = 0; /* Call avahi to find new Mandos
1380
2071
servers, but don't block */
1381
2072
}
1383
2074
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
2075
}
1385
2076
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
2077
if(ret > 0 or errno != EINTR){
1387
2078
return (ret != 1) ? ret : 0;
1388
2079
}
1389
2080
}
1390
2081
}
1391
2082
}
1392
2083
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
1446
2086
const float delay){
1447
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
}
1448
2115
struct dirent *direntry;
1449
2116
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
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);
1460
2122
}
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
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){
1468
2169
perror_plus("asprintf");
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
2170
_exit(EX_OSERR);
2171
}
2172
ret = setenv("DELAY", delaystring, 1);
2173
if(ret == -1){
1527
2174
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
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;
1539
2243
} else {
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
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);
1576
2263
}
1577
2264
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
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;
1584
2270
struct ifreq network;
1585
2271
unsigned int if_index = if_nametoindex(interface);
1586
2272
if(if_index == 0){
1595
2281
}
1596
2282
1597
2283
if(not interface_is_up(interface)){
1598
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)){
1599
2287
ret_errno = errno;
1600
2288
fprintf_plus(stderr, "Failed to get flags for interface "
1601
2289
"\"%s\"\n", interface);
2290
errno = old_errno;
1602
2291
return ret_errno;
1603
2292
}
1604
network.ifr_flags |= IFF_UP;
2293
network.ifr_flags |= IFF_UP; /* set flag */
1605
2294
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2296
if(sd == -1){
1608
2297
ret_errno = errno;
1609
2298
perror_plus("socket");
1610
2299
errno = old_errno;
1611
2300
return ret_errno;
1612
2301
}
1613
2302
1614
2303
if(quit_now){
1615
close(sd);
2304
ret = close(sd);
2305
if(ret == -1){
2306
perror_plus("close");
2307
}
1616
2308
errno = old_errno;
1617
2309
return EINTR;
1618
2310
}
1622
2314
interface);
1623
2315
}
1624
2316
1625
/* Raise priviliges */
1626
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
}
1627
2323
1628
2324
#ifdef __linux__
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
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
}
1636
2336
}
1637
2337
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
1640
2340
#ifdef __linux__
1641
2341
if(restore_loglevel){
1642
2342
ret_linux = klogctl(7, NULL, 0);
1646
2346
}
1647
2347
#endif /* __linux__ */
1648
2348
1649
/* Lower privileges */
1650
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
}
1651
2358
1652
2359
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2360
ret = close(sd);
1654
2361
if(ret == -1){
1655
2362
perror_plus("close");
1656
2363
}
1657
2364
1658
2365
if(ret_setflags == -1){
1659
errno = ret_errno;
2366
errno = ioctl_errno;
1660
2367
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
2368
errno = old_errno;
1662
return ret_errno;
2369
return ioctl_errno;
1663
2370
}
1664
2371
} else if(debug){
1665
2372
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1668
2375
1669
2376
/* Sleep checking until interface is running.
1670
2377
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
2378
for(int i = 0; i < delay * 4; i++){
1672
2379
if(interface_is_running(interface)){
1673
2380
break;
1674
2381
}
1683
2390
return 0;
1684
2391
}
1685
2392
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
1691
2396
struct ifreq network;
1692
2397
unsigned int if_index = if_nametoindex(interface);
1693
2398
if(if_index == 0){
1696
2401
return ENXIO;
1697
2402
}
1698
2403
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
1699
2406
if(not get_flags(interface, &network) and debug){
1700
2407
ret_errno = errno;
1701
2408
fprintf_plus(stderr, "Failed to get flags for interface "
1702
2409
"\"%s\"\n", interface);
2410
errno = old_errno;
1703
2411
return ret_errno;
1704
2412
}
1705
2413
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
2414
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2416
if(sd == -1){
1709
2417
ret_errno = errno;
1710
2418
perror_plus("socket");
1711
2419
errno = old_errno;
1717
2425
interface);
1718
2426
}
1719
2427
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
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
}
1728
2447
1729
2448
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2449
int ret = close(sd);
1731
2450
if(ret == -1){
1732
2451
perror_plus("close");
1733
2452
}
1734
2453
1735
2454
if(ret_setflags == -1){
1736
errno = ret_errno;
2455
errno = ioctl_errno;
1737
2456
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
2457
errno = old_errno;
1739
return ret_errno;
2458
return ioctl_errno;
1740
2459
}
1741
2460
} else if(debug){
1742
2461
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
2467
}
1749
2468
1750
2469
int main(int argc, char *argv[]){
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
":%PROFILE_ULTRA",
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#else
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
#endif
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
1751
2483
AvahiSServiceBrowser *sb = NULL;
1752
2484
error_t ret_errno;
1753
2485
int ret;
1754
2486
intmax_t tmpmax;
1755
2487
char *tmp;
1756
2488
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
2489
char *interfaces_to_take_down = NULL;
1760
2490
size_t interfaces_to_take_down_size = 0;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
1763
2494
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1764
2495
const char *seckey = PATHDIR "/" SECKEY;
1765
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;
1766
2502
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1768
2503
1769
2504
bool gnutls_initialized = false;
1770
2505
bool gpgme_initialized = false;
1816
2551
{ .name = "pubkey", .key = 'p',
1817
2552
.arg = "FILE",
1818
2553
.doc = "OpenPGP public key file base name",
1819
.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 },
1820
2571
{ .name = "dh-bits", .key = 129,
1821
2572
.arg = "BITS",
1822
2573
.doc = "Bit length of the prime number used in the"
1823
2574
" Diffie-Hellman key exchange",
1824
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 },
1825
2581
{ .name = "priority", .key = 130,
1826
2582
.arg = "STRING",
1827
2583
.doc = "GnuTLS priority string for the TLS handshake",
1861
2617
connect_to = arg;
1862
2618
break;
1863
2619
case 'i': /* --interface */
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2620
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2621
arg, (int)',');
1866
2622
if(ret_errno != 0){
1867
2623
argp_error(state, "%s", strerror(ret_errno));
1868
2624
}
1873
2629
case 'p': /* --pubkey */
1874
2630
pubkey = arg;
1875
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;
1876
2642
case 129: /* --dh-bits */
1877
2643
errno = 0;
1878
2644
tmpmax = strtoimax(arg, &tmp, 10);
1882
2648
}
1883
2649
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1884
2650
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
1885
2654
case 130: /* --priority */
1886
2655
mc.priority = arg;
1887
2656
break;
1910
2679
argp_state_help(state, state->out_stream,
1911
2680
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1912
2681
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
1913
2683
case -3: /* --usage */
1914
2684
argp_state_help(state, state->out_stream,
1915
2685
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
1916
2687
case 'V': /* --version */
1917
2688
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1918
2689
exit(argp_err_exit_status);
1927
2698
.args_doc = "",
1928
2699
.doc = "Mandos client -- Get and decrypt"
1929
2700
" passwords from a Mandos server" };
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2703
switch(ret_errno){
1933
2704
case 0:
1934
2705
break;
1935
2706
case ENOMEM:
1936
2707
default:
1937
errno = ret;
2708
errno = ret_errno;
1938
2709
perror_plus("argp_parse");
1939
2710
exitcode = EX_OSERR;
1940
2711
goto end;
1943
2714
goto end;
1944
2715
}
1945
2716
}
1946
2717
1947
2718
{
1948
2719
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
2720
<https://bugs.debian.org/633582> */
1950
2721
1951
/* Re-raise priviliges */
1952
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 {
1953
2728
struct stat st;
1954
2729
1955
2730
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1969
2744
}
1970
2745
}
1971
2746
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
close(seckey_fd);
1973
2748
}
1974
2749
}
1975
2750
1976
2751
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
2752
int pubkey_fd = open(pubkey, O_RDONLY);
1978
2753
if(pubkey_fd == -1){
1990
2765
}
1991
2766
}
1992
2767
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
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
1997
2794
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2798
perror_plus("Failed to lower privileges");
2002
2799
}
2003
2800
}
2004
2801
}
2005
2802
2006
/* Remove empty interface names */
2803
/* Remove invalid interface names (except "none") */
2007
2804
{
2008
2805
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2806
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2010
2807
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
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'){
2013
2811
fprintf_plus(stderr, "Not using nonexisting interface"
2014
2812
" \"%s\"\n", interface);
2015
2813
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2814
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2017
2815
interface = NULL;
2018
2816
}
2019
2817
}
2021
2819
2022
2820
/* Run network hooks */
2023
2821
{
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2822
if(mc.interfaces != NULL){
2823
interfaces_hooks = malloc(mc.interfaces_size);
2027
2824
if(interfaces_hooks == NULL){
2028
2825
perror_plus("malloc");
2029
2826
goto end;
2030
2827
}
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
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);
2040
2833
}
2041
2834
2042
2835
if(not debug){
2047
2840
from the signal handler */
2048
2841
/* Initialize the pseudo-RNG for Avahi */
2049
2842
srand((unsigned int) time(NULL));
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2843
simple_poll = avahi_simple_poll_new();
2844
if(simple_poll == NULL){
2052
2845
fprintf_plus(stderr,
2053
2846
"Avahi: Failed to create simple poll object.\n");
2054
2847
exitcode = EX_UNAVAILABLE;
2119
2912
}
2120
2913
2121
2914
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2915
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2124
2917
/* Look for any good interfaces */
2125
2918
ret = scandir(sys_class_net, &direntries, good_interface,
2126
2919
alphasort);
2127
2920
if(ret >= 1){
2128
2921
/* Add all found interfaces to interfaces list */
2129
2922
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2923
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2131
2924
direntries[i]->d_name);
2132
2925
if(ret_errno != 0){
2926
errno = ret_errno;
2133
2927
perror_plus("argz_add");
2928
free(direntries[i]);
2134
2929
continue;
2135
2930
}
2136
2931
if(debug){
2137
2932
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
2933
direntries[i]->d_name);
2139
2934
}
2935
free(direntries[i]);
2140
2936
}
2141
2937
free(direntries);
2142
2938
} else {
2143
free(direntries);
2939
if(ret == 0){
2940
free(direntries);
2941
}
2144
2942
fprintf_plus(stderr, "Could not find a network interface\n");
2145
2943
exitcode = EXIT_FAILURE;
2146
2944
goto end;
2147
2945
}
2148
2946
}
2149
2947
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2948
/* Bring up interfaces which are down, and remove any "none"s */
2949
{
2162
2950
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2951
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2164
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
}
2165
2969
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
2970
errno = bring_up_interface(interface, delay);
2167
2971
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
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));
2171
2975
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
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
}
2175
2982
}
2176
2983
}
2177
2984
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
2985
if(debug and (interfaces_to_take_down == NULL)){
2182
2986
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
2987
}
2184
2988
}
2185
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
2186
2999
if(quit_now){
2187
3000
goto end;
2188
3001
}
2189
3002
2190
ret = init_gnutls_global(pubkey, seckey);
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
2191
3010
if(ret == -1){
2192
3011
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
3012
exitcode = EX_UNAVAILABLE;
2200
3019
goto end;
2201
3020
}
2202
3021
2203
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){
2204
3032
perror_plus("mkdtemp");
2205
3033
goto end;
2206
3034
}
2207
tempdir_created = true;
2208
3035
2209
3036
if(quit_now){
2210
3037
goto end;
2211
3038
}
2212
3039
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
3040
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2214
3041
fprintf_plus(stderr, "init_gpgme failed\n");
2215
3042
exitcode = EX_UNAVAILABLE;
2216
3043
goto end;
2246
3073
exitcode = EX_USAGE;
2247
3074
goto end;
2248
3075
}
2249
3076
2250
3077
if(quit_now){
2251
3078
goto end;
2252
3079
}
2273
3100
}
2274
3101
2275
3102
while(not quit_now){
2276
ret = start_mandos_communication(address, port, if_index, af);
3103
ret = start_mandos_communication(address, port, if_index, af,
3104
&mc);
2277
3105
if(quit_now or ret == 0){
2278
3106
break;
2279
3107
}
2281
3109
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
3110
(int)retry_interval);
2283
3111
}
2284
sleep((int)retry_interval);
3112
sleep((unsigned int)retry_interval);
2285
3113
}
2286
3114
2287
if (not quit_now){
3115
if(not quit_now){
2288
3116
exitcode = EXIT_SUCCESS;
2289
3117
}
2290
3118
2305
3133
config.publish_domain = 0;
2306
3134
2307
3135
/* Allocate a new server */
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
3136
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3137
&config, NULL, NULL, &ret);
2311
3138
2312
3139
/* Free the Avahi configuration data */
2313
3140
avahi_server_config_free(&config);
2316
3143
/* Check if creating the Avahi server object succeeded */
2317
3144
if(mc.server == NULL){
2318
3145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
3146
avahi_strerror(ret));
2320
3147
exitcode = EX_UNAVAILABLE;
2321
3148
goto end;
2322
3149
}
2328
3155
/* Create the Avahi service browser */
2329
3156
sb = avahi_s_service_browser_new(mc.server, if_index,
2330
3157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2331
NULL, 0, browse_callback, NULL);
3158
NULL, 0, browse_callback,
3159
(void *)&mc);
2332
3160
if(sb == NULL){
2333
3161
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
3162
avahi_strerror(avahi_server_errno(mc.server)));
2345
3173
if(debug){
2346
3174
fprintf_plus(stderr, "Starting Avahi loop search\n");
2347
3175
}
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
3176
3177
ret = avahi_loop_with_timeout(simple_poll,
3178
(int)(retry_interval * 1000), &mc);
2351
3179
if(debug){
2352
3180
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
3181
(ret == 0) ? "successfully" : "with error");
2356
3184
end:
2357
3185
2358
3186
if(debug){
2359
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
}
2360
3194
}
2361
3195
2362
3196
/* Cleanup things */
3197
free(mc.interfaces);
3198
2363
3199
if(sb != NULL)
2364
3200
avahi_s_service_browser_free(sb);
2365
3201
2366
3202
if(mc.server != NULL)
2367
3203
avahi_server_free(mc.server);
2368
3204
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
3205
if(simple_poll != NULL)
3206
avahi_simple_poll_free(simple_poll);
2371
3207
2372
3208
if(gnutls_initialized){
2373
3209
gnutls_certificate_free_credentials(mc.cred);
2374
gnutls_global_deinit();
2375
3210
gnutls_dh_params_deinit(mc.dh_params);
2376
3211
}
2377
3212
2385
3220
mc.current_server->prev->next = NULL;
2386
3221
while(mc.current_server != NULL){
2387
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
2388
3231
free(mc.current_server);
2389
3232
mc.current_server = next;
2390
3233
}
2391
3234
}
2392
3235
2393
/* Re-raise priviliges */
3236
/* Re-raise privileges */
2394
3237
{
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
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
}
2420
3272
}
2421
3273
2422
3274
free(interfaces_to_take_down);
2423
3275
free(interfaces_hooks);
2424
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
2425
3331
/* Removes the GPGME temp directory and all files inside */
2426
if(tempdir_created){
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
direntry->d_name);
2437
if(ret < 0){
2438
perror_plus("asprintf");
2439
continue;
2440
}
2441
ret = remove(fullname);
2442
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2445
}
2446
free(fullname);
2447
}
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
2454
}
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
2458
}
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
2459
3334
}
2460
3335
2461
3336
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0