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- Committer: Teddy Hogeborn
- Date: 2011-12-31 20:07:11 UTC
- mfrom: (535.1.9 wireless-network-hook)
- Revision ID: teddy@recompile.se-20111231200711-6dli3r8drftem57r
Merge new wireless network hook. Fix bridge network hook to use
hardware addresses instead of interface names. Implement and document
new "CONNECT" environment variable for network hooks.
hardware addresses instead of interface names. Implement and document
new "CONNECT" environment variable for network hooks.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
72
66
program_invocation_short_name */
73
67
#include <time.h> /* nanosleep(), time(), sleep() */
74
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
75
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
85
78
#include <iso646.h> /* not, or, and */
86
79
#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
95
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
89
WEXITSTATUS(), WTERMSIG() */
97
90
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
91
105
92
#ifdef __linux__
106
93
#include <sys/klog.h> /* klogctl() */
123
110
gnutls_*
124
111
init_gnutls_session(),
125
112
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
113
#include <gnutls/openpgp.h>
128
114
/* gnutls_certificate_set_openpgp_key_file(),
129
115
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
135
116
136
117
/* GPGME */
137
118
#include <gpgme.h> /* All GPGME types, constants and
145
126
#define PATHDIR "/conf/conf.d/mandos"
146
127
#define SECKEY "seckey.txt"
147
128
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
130
152
131
bool debug = false;
156
135
static const char sys_class_net[] = "/sys/class/net";
157
136
char *connect_to = NULL;
158
137
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
uid_t uid = 65534;
161
gid_t gid = 65534;
162
138
163
139
/* Doubly linked list that need to be circularly linked when used */
164
140
typedef struct server{
165
141
const char *ip;
166
in_port_t port;
142
uint16_t port;
167
143
AvahiIfIndex if_index;
168
144
int af;
169
145
struct timespec last_seen;
173
149
174
150
/* Used for passing in values through the Avahi callback functions */
175
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
176
153
AvahiServer *server;
177
154
gnutls_certificate_credentials_t cred;
178
155
unsigned int dh_bits;
180
157
const char *priority;
181
158
gpgme_ctx_t ctx;
182
159
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
185
160
} mandos_context;
186
161
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
189
167
190
168
sig_atomic_t quit_now = 0;
191
169
int signal_received = 0;
199
177
perror(print_text);
200
178
}
201
179
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
180
__attribute__((format (gnu_printf, 2, 3)))
203
181
int fprintf_plus(FILE *stream, const char *format, ...){
204
182
va_list ap;
205
183
va_start (ap, format);
206
184
207
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
186
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
188
}
211
189
212
190
/*
214
192
* bytes. "buffer_capacity" is how much is currently allocated,
215
193
* "buffer_length" is how much is already used.
216
194
*/
217
__attribute__((nonnull, warn_unused_result))
218
195
size_t incbuffer(char **buffer, size_t buffer_length,
219
196
size_t buffer_capacity){
220
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
227
200
return 0;
228
201
}
229
*buffer = new_buf;
230
202
buffer_capacity += BUFFER_SIZE;
231
203
}
232
204
return buffer_capacity;
233
205
}
234
206
235
207
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
int af, server **current_server){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
239
210
int ret;
240
211
server *new_server = malloc(sizeof(server));
241
212
if(new_server == NULL){
248
219
.af = af };
249
220
if(new_server->ip == NULL){
250
221
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
266
222
return false;
267
223
}
268
224
/* Special case of first server */
269
if(*current_server == NULL){
225
if (mc.current_server == NULL){
270
226
new_server->next = new_server;
271
227
new_server->prev = new_server;
272
*current_server = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
273
230
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
277
233
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
279
240
}
280
241
return true;
281
242
}
282
243
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
335
244
/*
336
245
* Initialize GPGME.
337
246
*/
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){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
343
249
gpgme_error_t rc;
344
250
gpgme_engine_info_t engine_info;
345
251
252
346
253
/*
347
254
* Helper function to insert pub and seckey to the engine keyring.
348
255
*/
349
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
350
257
int ret;
351
258
int fd;
352
259
gpgme_data_t pgp_data;
357
264
return false;
358
265
}
359
266
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
410
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
268
if(rc != GPG_ERR_NO_ERROR){
412
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
414
271
return false;
415
272
}
416
273
417
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
418
275
if(rc != GPG_ERR_NO_ERROR){
419
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
420
277
gpgme_strsource(rc), gpgme_strerror(rc));
421
278
return false;
422
279
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
498
280
499
ret = close(fd);
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
282
if(ret == -1){
501
283
perror_plus("close");
502
284
}
539
321
}
540
322
541
323
/* Create new GPGME "context" */
542
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
543
325
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
546
329
return false;
547
330
}
548
331
557
340
* Decrypt OpenPGP data.
558
341
* Returns -1 on error
559
342
*/
560
__attribute__((nonnull, warn_unused_result))
561
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
562
344
size_t crypto_size,
563
char **plaintext,
564
mandos_context *mc){
345
char **plaintext){
565
346
gpgme_data_t dh_crypto, dh_plain;
566
347
gpgme_error_t rc;
567
348
ssize_t ret;
584
365
/* Create new empty GPGME data buffer for the plaintext */
585
366
rc = gpgme_data_new(&dh_plain);
586
367
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
588
370
gpgme_strsource(rc), gpgme_strerror(rc));
589
371
gpgme_data_release(dh_crypto);
590
372
return -1;
592
374
593
375
/* Decrypt data from the cryptotext data buffer to the plaintext
594
376
data buffer */
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
596
378
if(rc != GPG_ERR_NO_ERROR){
597
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
598
380
gpgme_strsource(rc), gpgme_strerror(rc));
599
381
plaintext_length = -1;
600
382
if(debug){
601
383
gpgme_decrypt_result_t result;
602
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
603
385
if(result == NULL){
604
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
387
} else {
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
612
392
if(result->file_name != NULL){
613
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
394
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
395
gpgme_recipient_t recipient;
396
recipient = result->recipients;
397
while(recipient != NULL){
618
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
402
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
623
406
}
624
407
}
625
408
}
681
464
return plaintext_length;
682
465
}
683
466
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){
693
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
695
473
}
696
474
697
475
/* GnuTLS log function callback */
698
__attribute__((nonnull))
699
476
static void debuggnutls(__attribute__((unused)) int level,
700
477
const char* string){
701
478
fprintf_plus(stderr, "GnuTLS: %s", string);
702
479
}
703
480
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
705
481
static int init_gnutls_global(const char *pubkeyfilename,
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
mandos_context *mc){
482
const char *seckeyfilename){
709
483
int ret;
710
484
711
485
if(debug){
712
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
487
}
714
488
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
493
return -1;
494
}
495
715
496
if(debug){
716
497
/* "Use a log level over 10 to enable all debugging options."
717
498
* - GnuTLS manual
721
502
}
722
503
723
504
/* OpenPGP credentials */
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
725
506
if(ret != GNUTLS_E_SUCCESS){
726
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
508
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
728
510
return -1;
729
511
}
730
512
731
513
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
734
516
pubkeyfilename,
735
517
seckeyfilename);
736
518
}
737
519
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
751
520
ret = gnutls_certificate_set_openpgp_key_file
752
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
753
522
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
523
if(ret != GNUTLS_E_SUCCESS){
758
524
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
528
safer_gnutls_strerror(ret));
764
530
}
765
531
766
532
/* GnuTLS server initialization */
767
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
768
534
if(ret != GNUTLS_E_SUCCESS){
769
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
770
536
" initialization: %s\n",
771
537
safer_gnutls_strerror(ret));
772
538
goto globalfail;
773
539
}
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
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
956
548
957
549
return 0;
958
550
959
551
globalfail:
960
552
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
963
556
return -1;
964
557
}
965
558
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
968
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
969
560
int ret;
970
561
/* GnuTLS session creation */
971
562
do {
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
563
ret = gnutls_init(session, GNUTLS_SERVER);
980
564
if(quit_now){
981
565
return -1;
982
566
}
990
574
{
991
575
const char *err;
992
576
do {
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
994
578
if(quit_now){
995
579
gnutls_deinit(*session);
996
580
return -1;
1007
591
1008
592
do {
1009
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1010
mc->cred);
594
mc.cred);
1011
595
if(quit_now){
1012
596
gnutls_deinit(*session);
1013
597
return -1;
1023
607
/* ignore client certificate if any. */
1024
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
609
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
1026
612
return 0;
1027
613
}
1028
614
1030
616
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
617
__attribute__((unused)) const char *txt){}
1032
618
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
_exit(EX_NOPERM);
1085
}
1086
}
1087
ret = dup2(devnull, STDIN_FILENO);
1088
if(ret == -1){
1089
perror_plus("dup2(devnull, STDIN_FILENO)");
1090
_exit(EX_OSERR);
1091
}
1092
ret = close(devnull);
1093
if(ret == -1){
1094
perror_plus("close");
1095
_exit(EX_OSERR);
1096
}
1097
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1098
if(ret == -1){
1099
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1100
_exit(EX_OSERR);
1101
}
1102
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1103
O_RDONLY
1104
| O_DIRECTORY
1105
| O_PATH
1106
| O_CLOEXEC));
1107
if(helperdir_fd == -1){
1108
perror_plus("open");
1109
_exit(EX_UNAVAILABLE);
1110
}
1111
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1112
helper, O_RDONLY));
1113
if(helper_fd == -1){
1114
perror_plus("openat");
1115
close(helperdir_fd);
1116
_exit(EX_UNAVAILABLE);
1117
}
1118
close(helperdir_fd);
1119
#ifdef __GNUC__
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wcast-qual"
1122
#endif
1123
if(fexecve(helper_fd, (char *const [])
1124
{ helper, add ? add_arg : delete_arg, (char *)address,
1125
interface, debug ? debug_flag : NULL, NULL },
1126
environ) == -1){
1127
#ifdef __GNUC__
1128
#pragma GCC diagnostic pop
1129
#endif
1130
perror_plus("fexecve");
1131
_exit(EXIT_FAILURE);
1132
}
1133
}
1134
if(pid == -1){
1135
perror_plus("fork");
1136
return false;
1137
}
1138
int status;
1139
pid_t pret = -1;
1140
errno = 0;
1141
do {
1142
pret = waitpid(pid, &status, 0);
1143
if(pret == -1 and errno == EINTR and quit_now){
1144
int errno_raising = 0;
1145
if((errno = raise_privileges()) != 0){
1146
errno_raising = errno;
1147
perror_plus("Failed to raise privileges in order to"
1148
" kill helper program");
1149
}
1150
if(kill(pid, SIGTERM) == -1){
1151
perror_plus("kill");
1152
}
1153
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1154
perror_plus("Failed to lower privileges after killing"
1155
" helper program");
1156
}
1157
return false;
1158
}
1159
} while(pret == -1 and errno == EINTR);
1160
if(pret == -1){
1161
perror_plus("waitpid");
1162
return false;
1163
}
1164
if(WIFEXITED(status)){
1165
if(WEXITSTATUS(status) != 0){
1166
fprintf_plus(stderr, "Error: iprouteadddel exited"
1167
" with status %d\n", WEXITSTATUS(status));
1168
return false;
1169
}
1170
return true;
1171
}
1172
if(WIFSIGNALED(status)){
1173
fprintf_plus(stderr, "Error: iprouteadddel died by"
1174
" signal %d\n", WTERMSIG(status));
1175
return false;
1176
}
1177
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1178
return false;
1179
}
1180
1181
__attribute__((nonnull, warn_unused_result))
1182
static bool add_local_route(const char *address,
1183
AvahiIfIndex if_index){
1184
if(debug){
1185
fprintf_plus(stderr, "Adding route to %s\n", address);
1186
}
1187
return add_delete_local_route(true, address, if_index);
1188
}
1189
1190
__attribute__((nonnull, warn_unused_result))
1191
static bool delete_local_route(const char *address,
1192
AvahiIfIndex if_index){
1193
if(debug){
1194
fprintf_plus(stderr, "Removing route to %s\n", address);
1195
}
1196
return add_delete_local_route(false, address, if_index);
1197
}
1198
1199
619
/* Called when a Mandos server is found */
1200
__attribute__((nonnull, warn_unused_result))
1201
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
1202
621
AvahiIfIndex if_index,
1203
int af, mandos_context *mc){
622
int af){
1204
623
int ret, tcp_sd = -1;
1205
624
ssize_t sret;
1206
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1207
629
char *buffer = NULL;
1208
630
char *decrypted_buffer = NULL;
1209
631
size_t buffer_length = 0;
1212
634
int retval = -1;
1213
635
gnutls_session_t session;
1214
636
int pf; /* Protocol family */
1215
bool route_added = false;
1216
637
1217
638
errno = 0;
1218
639
1234
655
return -1;
1235
656
}
1236
657
1237
/* If the interface is specified and we have a list of interfaces */
1238
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1239
/* Check if the interface is one of the interfaces we are using */
1240
bool match = false;
1241
{
1242
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1245
interface))){
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
1247
match = true;
1248
break;
1249
}
1250
}
1251
}
1252
if(not match){
1253
/* This interface does not match any in the list, so we don't
1254
connect to the server */
1255
if(debug){
1256
char interface[IF_NAMESIZE];
1257
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1258
perror_plus("if_indextoname");
1259
} else {
1260
fprintf_plus(stderr, "Skipping server on non-used interface"
1261
" \"%s\"\n",
1262
if_indextoname((unsigned int)if_index,
1263
interface));
1264
}
1265
}
1266
return -1;
1267
}
1268
}
1269
1270
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
1271
659
if(ret != 0){
1272
660
return -1;
1273
661
}
1274
662
1275
663
if(debug){
1276
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1277
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
1278
666
}
1279
667
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1281
669
if(tcp_sd < 0){
1282
670
int e = errno;
1283
671
perror_plus("socket");
1290
678
goto mandos_end;
1291
679
}
1292
680
681
memset(&to, 0, sizeof(to));
1293
682
if(af == AF_INET6){
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1297
685
} else { /* IPv4 */
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1301
688
}
1302
689
if(ret < 0 ){
1303
690
int e = errno;
1312
699
goto mandos_end;
1313
700
}
1314
701
if(af == AF_INET6){
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1316
if(IN6_IS_ADDR_LINKLOCAL
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1318
709
if(if_index == AVAHI_IF_UNSPEC){
1319
710
fprintf_plus(stderr, "An IPv6 link-local address is"
1320
711
" incomplete without a network interface\n");
1322
713
goto mandos_end;
1323
714
}
1324
715
/* Set the network interface number as scope */
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1326
717
}
1327
718
} else {
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1329
722
}
1330
723
1331
724
if(quit_now){
1339
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1340
733
perror_plus("if_indextoname");
1341
734
} else {
1342
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1343
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1344
737
}
1345
738
} else {
1346
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1347
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1348
741
}
1349
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1350
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1351
if(af == AF_INET6){
1352
ret = getnameinfo((struct sockaddr *)&to,
1353
sizeof(struct sockaddr_in6),
1354
addrstr, sizeof(addrstr), NULL, 0,
1355
NI_NUMERICHOST);
1356
} else {
1357
ret = getnameinfo((struct sockaddr *)&to,
1358
sizeof(struct sockaddr_in),
1359
addrstr, sizeof(addrstr), NULL, 0,
1360
NI_NUMERICHOST);
1361
}
1362
if(ret == EAI_SYSTEM){
1363
perror_plus("getnameinfo");
1364
} else if(ret != 0) {
1365
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1366
} else if(strcmp(addrstr, ip) != 0){
1367
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1368
}
1369
}
1370
1371
if(quit_now){
1372
errno = EINTR;
1373
goto mandos_end;
1374
}
1375
1376
while(true){
1377
if(af == AF_INET6){
1378
ret = connect(tcp_sd, (struct sockaddr *)&to,
1379
sizeof(struct sockaddr_in6));
1380
} else {
1381
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1382
sizeof(struct sockaddr_in));
1383
}
1384
if(ret < 0){
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1386
and if_index != AVAHI_IF_UNSPEC
1387
and connect_to == NULL
1388
and not route_added and
1389
((af == AF_INET6 and not
1390
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1391
&to)->sin6_addr)))
1392
or (af == AF_INET and
1393
/* Not a a IPv4LL address */
1394
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1395
& 0xFFFF0000L) != 0xA9FE0000L))){
1396
/* Work around Avahi bug - Avahi does not announce link-local
1397
addresses if it has a global address, so local hosts with
1398
*only* a link-local address (e.g. Mandos clients) cannot
1399
connect to a Mandos server announced by Avahi on a server
1400
host with a global address. Work around this by retrying
1401
with an explicit route added with the server's address.
1402
1403
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
https://bugs.debian.org/587961
1406
*/
1407
if(debug){
1408
fprintf_plus(stderr, "Mandos server unreachable, trying"
1409
" direct route\n");
1410
}
1411
int e = errno;
1412
route_added = add_local_route(ip, if_index);
1413
if(route_added){
1414
continue;
1415
}
1416
errno = e;
1417
}
1418
if(errno != ECONNREFUSED or debug){
1419
int e = errno;
1420
perror_plus("connect");
1421
errno = e;
1422
}
1423
goto mandos_end;
1424
}
1425
1426
if(quit_now){
1427
errno = EINTR;
1428
goto mandos_end;
1429
}
1430
break;
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
1431
783
}
1432
784
1433
785
const char *out = mandos_protocol_version;
1469
821
goto mandos_end;
1470
822
}
1471
823
1472
/* This casting via intptr_t is to eliminate warning about casting
1473
an int to a pointer type. This is exactly how the GnuTLS Guile
1474
function "set-session-transport-fd!" does it. */
1475
gnutls_transport_set_ptr(session,
1476
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1477
826
1478
827
if(quit_now){
1479
828
errno = EINTR;
1584
933
if(buffer_length > 0){
1585
934
ssize_t decrypted_buffer_size;
1586
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1587
&decrypted_buffer, mc);
936
&decrypted_buffer);
1588
937
if(decrypted_buffer_size >= 0){
1589
938
1590
clearerr(stdout);
1591
939
written = 0;
1592
940
while(written < (size_t) decrypted_buffer_size){
1593
941
if(quit_now){
1609
957
}
1610
958
written += (size_t)ret;
1611
959
}
1612
ret = fflush(stdout);
1613
if(ret != 0){
1614
int e = errno;
1615
if(debug){
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1617
strerror(errno));
1618
}
1619
errno = e;
1620
goto mandos_end;
1621
}
1622
960
retval = 0;
1623
961
}
1624
962
}
1627
965
1628
966
mandos_end:
1629
967
{
1630
if(route_added){
1631
if(not delete_local_route(ip, if_index)){
1632
fprintf_plus(stderr, "Failed to delete local route to %s on"
1633
" interface %d", ip, if_index);
1634
}
1635
}
1636
968
int e = errno;
1637
969
free(decrypted_buffer);
1638
970
free(buffer);
1639
971
if(tcp_sd >= 0){
1640
ret = close(tcp_sd);
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1641
973
}
1642
974
if(ret == -1){
1643
975
if(e == 0){
1668
1000
AVAHI_GCC_UNUSED AvahiStringList *txt,
1669
1001
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1670
1002
flags,
1671
void *mc){
1672
if(r == NULL){
1673
return;
1674
}
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1675
1005
1676
1006
/* Called whenever a service has been resolved successfully or
1677
1007
timed out */
1678
1008
1679
1009
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1681
1010
return;
1682
1011
}
1683
1012
1687
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1688
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1689
1018
domain,
1690
avahi_strerror(avahi_server_errno
1691
(((mandos_context*)mc)->server)));
1019
avahi_strerror(avahi_server_errno(mc.server)));
1692
1020
break;
1693
1021
1694
1022
case AVAHI_RESOLVER_FOUND:
1700
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1701
1029
host_name, ip, (intmax_t)interface, port);
1702
1030
}
1703
int ret = start_mandos_communication(ip, (in_port_t)port,
1704
interface,
1705
avahi_proto_to_af(proto),
1706
mc);
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1707
1033
if(ret == 0){
1708
avahi_simple_poll_quit(simple_poll);
1034
avahi_simple_poll_quit(mc.simple_poll);
1709
1035
} else {
1710
if(not add_server(ip, (in_port_t)port, interface,
1711
avahi_proto_to_af(proto),
1712
&((mandos_context*)mc)->current_server)){
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1713
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1714
1039
" list\n", name);
1715
1040
}
1728
1053
const char *domain,
1729
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1730
1055
flags,
1731
void *mc){
1732
if(b == NULL){
1733
return;
1734
}
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1735
1058
1736
1059
/* Called whenever a new services becomes available on the LAN or
1737
1060
is removed from the LAN */
1745
1068
case AVAHI_BROWSER_FAILURE:
1746
1069
1747
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1748
avahi_strerror(avahi_server_errno
1749
(((mandos_context*)mc)->server)));
1750
avahi_simple_poll_quit(simple_poll);
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1751
1073
return;
1752
1074
1753
1075
case AVAHI_BROWSER_NEW:
1756
1078
the callback function is called the Avahi server will free the
1757
1079
resolver for us. */
1758
1080
1759
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1760
interface, protocol, name, type,
1761
domain, protocol, 0,
1762
resolve_callback, mc) == NULL)
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1763
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1764
1085
" %s\n", name,
1765
avahi_strerror(avahi_server_errno
1766
(((mandos_context*)mc)->server)));
1086
avahi_strerror(avahi_server_errno(mc.server)));
1767
1087
break;
1768
1088
1769
1089
case AVAHI_BROWSER_REMOVE:
1788
1108
signal_received = sig;
1789
1109
int old_errno = errno;
1790
1110
/* set main loop to exit */
1791
if(simple_poll != NULL){
1792
avahi_simple_poll_quit(simple_poll);
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1793
1113
}
1794
1114
errno = old_errno;
1795
1115
}
1796
1116
1797
__attribute__((nonnull, warn_unused_result))
1798
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
1118
int ret;
1800
int old_errno;
1801
1119
1802
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
1121
if(s < 0){
1804
old_errno = errno;
1805
1122
perror_plus("socket");
1806
errno = old_errno;
1807
1123
return false;
1808
1124
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1125
strcpy(ifr->ifr_name, ifname);
1811
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
1127
if(ret == -1){
1813
1128
if(debug){
1814
old_errno = errno;
1815
1129
perror_plus("ioctl SIOCGIFFLAGS");
1816
errno = old_errno;
1817
}
1818
if((close(s) == -1) and debug){
1819
old_errno = errno;
1820
perror_plus("close");
1821
errno = old_errno;
1822
1130
}
1823
1131
return false;
1824
1132
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
1133
return true;
1831
1134
}
1832
1135
1833
__attribute__((nonnull, warn_unused_result))
1834
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1835
1137
1836
1138
/* Reject the loopback device */
1878
1180
* corresponds to an acceptable network device.
1879
1181
* (This function is passed to scandir(3) as a filter function.)
1880
1182
*/
1881
__attribute__((nonnull, warn_unused_result))
1882
1183
int good_interface(const struct dirent *if_entry){
1883
1184
if(if_entry->d_name[0] == '.'){
1884
1185
return 0;
1900
1201
}
1901
1202
1902
1203
/*
1903
* This function determines if a network interface is up.
1904
*/
1905
__attribute__((nonnull, warn_unused_result))
1906
bool interface_is_up(const char *interface){
1907
struct ifreq ifr;
1908
if(not get_flags(interface, &ifr)){
1909
if(debug){
1910
fprintf_plus(stderr, "Failed to get flags for interface "
1911
"\"%s\"\n", interface);
1912
}
1913
return false;
1914
}
1915
1916
return (bool)(ifr.ifr_flags & IFF_UP);
1917
}
1918
1919
/*
1920
* This function determines if a network interface is running
1921
*/
1922
__attribute__((nonnull, warn_unused_result))
1923
bool interface_is_running(const char *interface){
1924
struct ifreq ifr;
1925
if(not get_flags(interface, &ifr)){
1926
if(debug){
1927
fprintf_plus(stderr, "Failed to get flags for interface "
1928
"\"%s\"\n", interface);
1929
}
1930
return false;
1931
}
1932
1933
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1934
}
1935
1936
__attribute__((nonnull, pure, warn_unused_result))
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1937
1246
int notdotentries(const struct dirent *direntry){
1938
1247
/* Skip "." and ".." */
1939
1248
if(direntry->d_name[0] == '.'
1946
1255
}
1947
1256
1948
1257
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1950
1258
int runnable_hook(const struct dirent *direntry){
1951
1259
int ret;
1952
1260
size_t sret;
1960
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1961
1269
"abcdefghijklmnopqrstuvwxyz"
1962
1270
"0123456789"
1963
"_.-");
1271
"_-");
1964
1272
if((direntry->d_name)[sret] != '\0'){
1965
1273
/* Contains non-allowed characters */
1966
1274
if(debug){
1970
1278
return 0;
1971
1279
}
1972
1280
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1974
1289
if(ret == -1){
1975
1290
if(debug){
1976
1291
perror_plus("Could not stat hook");
2000
1315
return 1;
2001
1316
}
2002
1317
2003
__attribute__((nonnull, warn_unused_result))
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2005
mandos_context *mc){
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2006
1319
int ret;
2007
1320
struct timespec now;
2008
1321
struct timespec waited_time;
2009
1322
intmax_t block_time;
2010
1323
2011
1324
while(true){
2012
if(mc->current_server == NULL){
2013
if(debug){
1325
if(mc.current_server == NULL){
1326
if (debug){
2014
1327
fprintf_plus(stderr, "Wait until first server is found."
2015
1328
" No timeout!\n");
2016
1329
}
2017
1330
ret = avahi_simple_poll_iterate(s, -1);
2018
1331
} else {
2019
if(debug){
1332
if (debug){
2020
1333
fprintf_plus(stderr, "Check current_server if we should run"
2021
1334
" it, or wait\n");
2022
1335
}
2029
1342
/* Calculating in ms how long time between now and server
2030
1343
who we visted longest time ago. Now - last seen. */
2031
1344
waited_time.tv_sec = (now.tv_sec
2032
- mc->current_server->last_seen.tv_sec);
1345
- mc.current_server->last_seen.tv_sec);
2033
1346
waited_time.tv_nsec = (now.tv_nsec
2034
- mc->current_server->last_seen.tv_nsec);
1347
- mc.current_server->last_seen.tv_nsec);
2035
1348
/* total time is 10s/10,000ms.
2036
1349
Converting to s from ms by dividing by 1,000,
2037
1350
and ns to ms by dividing by 1,000,000. */
2039
1352
- ((intmax_t)waited_time.tv_sec * 1000))
2040
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
2041
1354
2042
if(debug){
1355
if (debug){
2043
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2044
1357
block_time);
2045
1358
}
2046
1359
2047
1360
if(block_time <= 0){
2048
ret = start_mandos_communication(mc->current_server->ip,
2049
mc->current_server->port,
2050
mc->current_server->if_index,
2051
mc->current_server->af, mc);
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
2052
1365
if(ret == 0){
2053
avahi_simple_poll_quit(s);
1366
avahi_simple_poll_quit(mc.simple_poll);
2054
1367
return 0;
2055
1368
}
2056
1369
ret = clock_gettime(CLOCK_MONOTONIC,
2057
&mc->current_server->last_seen);
1370
&mc.current_server->last_seen);
2058
1371
if(ret == -1){
2059
1372
perror_plus("clock_gettime");
2060
1373
return -1;
2061
1374
}
2062
mc->current_server = mc->current_server->next;
1375
mc.current_server = mc.current_server->next;
2063
1376
block_time = 0; /* Call avahi to find new Mandos
2064
1377
servers, but don't block */
2065
1378
}
2067
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
2068
1381
}
2069
1382
if(ret != 0){
2070
if(ret > 0 or errno != EINTR){
1383
if (ret > 0 or errno != EINTR){
2071
1384
return (ret != 1) ? ret : 0;
2072
1385
}
2073
1386
}
2074
1387
}
2075
1388
}
2076
1389
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
1390
bool run_network_hooks(const char *mode, const char *interface,
2079
1391
const float delay){
2080
struct dirent **direntries = NULL;
2081
if(hookdir_fd == -1){
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2083
| O_CLOEXEC);
2084
if(hookdir_fd == -1){
2085
if(errno == ENOENT){
2086
if(debug){
2087
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2088
" found\n", hookdir);
2089
}
2090
} else {
2091
perror_plus("open");
2092
}
2093
return;
2094
}
2095
}
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2097
if(devnull == -1){
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2099
return;
2100
}
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
runnable_hook, alphasort);
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
2103
1397
if(numhooks == -1){
2104
1398
perror_plus("scandir");
2105
close(devnull);
2106
return;
2107
}
2108
struct dirent *direntry;
2109
int ret;
2110
for(int i = 0; i < numhooks; i++){
2111
direntry = direntries[i];
2112
if(debug){
2113
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2114
direntry->d_name);
2115
}
2116
pid_t hook_pid = fork();
2117
if(hook_pid == 0){
2118
/* Child */
2119
/* Raise privileges */
2120
errno = raise_privileges_permanently();
2121
if(errno != 0){
2122
perror_plus("Failed to raise privileges");
2123
_exit(EX_NOPERM);
2124
}
2125
/* Set group */
2126
errno = 0;
2127
ret = setgid(0);
2128
if(ret == -1){
2129
perror_plus("setgid");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Reset supplementary groups */
2133
errno = 0;
2134
ret = setgroups(0, NULL);
2135
if(ret == -1){
2136
perror_plus("setgroups");
2137
_exit(EX_NOPERM);
2138
}
2139
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
ret = setenv("DEVICE", interface, 1);
2145
if(ret == -1){
2146
perror_plus("setenv");
2147
_exit(EX_OSERR);
2148
}
2149
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2150
if(ret == -1){
2151
perror_plus("setenv");
2152
_exit(EX_OSERR);
2153
}
2154
ret = setenv("MODE", mode, 1);
2155
if(ret == -1){
2156
perror_plus("setenv");
2157
_exit(EX_OSERR);
2158
}
2159
char *delaystring;
2160
ret = asprintf(&delaystring, "%f", (double)delay);
2161
if(ret == -1){
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
2162
1406
perror_plus("asprintf");
2163
_exit(EX_OSERR);
2164
}
2165
ret = setenv("DELAY", delaystring, 1);
2166
if(ret == -1){
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
2167
1475
free(delaystring);
2168
perror_plus("setenv");
2169
_exit(EX_OSERR);
2170
}
2171
free(delaystring);
2172
if(connect_to != NULL){
2173
ret = setenv("CONNECT", connect_to, 1);
2174
if(ret == -1){
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
}
2179
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2180
direntry->d_name,
2181
O_RDONLY));
2182
if(hook_fd == -1){
2183
perror_plus("openat");
2184
_exit(EXIT_FAILURE);
2185
}
2186
if(close(hookdir_fd) == -1){
2187
perror_plus("close");
2188
_exit(EXIT_FAILURE);
2189
}
2190
ret = dup2(devnull, STDIN_FILENO);
2191
if(ret == -1){
2192
perror_plus("dup2(devnull, STDIN_FILENO)");
2193
_exit(EX_OSERR);
2194
}
2195
ret = close(devnull);
2196
if(ret == -1){
2197
perror_plus("close");
2198
_exit(EX_OSERR);
2199
}
2200
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2201
if(ret == -1){
2202
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2203
_exit(EX_OSERR);
2204
}
2205
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2206
environ) == -1){
2207
perror_plus("fexecve");
2208
_exit(EXIT_FAILURE);
2209
}
2210
} else {
2211
if(hook_pid == -1){
2212
perror_plus("fork");
2213
free(direntry);
2214
continue;
2215
}
2216
int status;
2217
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2218
perror_plus("waitpid");
2219
free(direntry);
2220
continue;
2221
}
2222
if(WIFEXITED(status)){
2223
if(WEXITSTATUS(status) != 0){
2224
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2225
" with status %d\n", direntry->d_name,
2226
WEXITSTATUS(status));
2227
free(direntry);
2228
continue;
2229
}
2230
} else if(WIFSIGNALED(status)){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2232
" signal %d\n", direntry->d_name,
2233
WTERMSIG(status));
2234
free(direntry);
2235
continue;
2236
} else {
2237
fprintf_plus(stderr, "Warning: network hook \"%s\""
2238
" crashed\n", direntry->d_name);
2239
free(direntry);
2240
continue;
2241
}
2242
}
2243
if(debug){
2244
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2245
direntry->d_name);
2246
}
2247
free(direntry);
2248
}
2249
free(direntries);
2250
if(close(hookdir_fd) == -1){
2251
perror_plus("close");
2252
} else {
2253
hookdir_fd = -1;
2254
}
2255
close(devnull);
2256
}
2257
2258
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2260
const float delay){
2261
int old_errno = errno;
2262
int ret;
2263
struct ifreq network;
2264
unsigned int if_index = if_nametoindex(interface);
2265
if(if_index == 0){
2266
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2267
errno = old_errno;
2268
return ENXIO;
2269
}
2270
2271
if(quit_now){
2272
errno = old_errno;
2273
return EINTR;
2274
}
2275
2276
if(not interface_is_up(interface)){
2277
int ret_errno = 0;
2278
int ioctl_errno = 0;
2279
if(not get_flags(interface, &network)){
2280
ret_errno = errno;
2281
fprintf_plus(stderr, "Failed to get flags for interface "
2282
"\"%s\"\n", interface);
2283
errno = old_errno;
2284
return ret_errno;
2285
}
2286
network.ifr_flags |= IFF_UP; /* set flag */
2287
2288
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2289
if(sd == -1){
2290
ret_errno = errno;
2291
perror_plus("socket");
2292
errno = old_errno;
2293
return ret_errno;
2294
}
2295
2296
if(quit_now){
2297
ret = close(sd);
2298
if(ret == -1){
2299
perror_plus("close");
2300
}
2301
errno = old_errno;
2302
return EINTR;
2303
}
2304
2305
if(debug){
2306
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2307
interface);
2308
}
2309
2310
/* Raise privileges */
2311
ret_errno = raise_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to raise privileges");
2315
}
2316
2317
#ifdef __linux__
2318
int ret_linux;
2319
bool restore_loglevel = false;
2320
if(ret_errno == 0){
2321
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2322
messages about the network interface to mess up the prompt */
2323
ret_linux = klogctl(8, NULL, 5);
2324
if(ret_linux == -1){
2325
perror_plus("klogctl");
2326
} else {
2327
restore_loglevel = true;
2328
}
2329
}
2330
#endif /* __linux__ */
2331
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2332
ioctl_errno = errno;
2333
#ifdef __linux__
2334
if(restore_loglevel){
2335
ret_linux = klogctl(7, NULL, 0);
2336
if(ret_linux == -1){
2337
perror_plus("klogctl");
2338
}
2339
}
2340
#endif /* __linux__ */
2341
2342
/* If raise_privileges() succeeded above */
2343
if(ret_errno == 0){
2344
/* Lower privileges */
2345
ret_errno = lower_privileges();
2346
if(ret_errno != 0){
2347
errno = ret_errno;
2348
perror_plus("Failed to lower privileges");
2349
}
2350
}
2351
2352
/* Close the socket */
2353
ret = close(sd);
2354
if(ret == -1){
2355
perror_plus("close");
2356
}
2357
2358
if(ret_setflags == -1){
2359
errno = ioctl_errno;
2360
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2361
errno = old_errno;
2362
return ioctl_errno;
2363
}
2364
} else if(debug){
2365
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2366
interface);
2367
}
2368
2369
/* Sleep checking until interface is running.
2370
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
2372
if(interface_is_running(interface)){
2373
break;
2374
}
2375
struct timespec sleeptime = { .tv_nsec = 250000000 };
2376
ret = nanosleep(&sleeptime, NULL);
2377
if(ret == -1 and errno != EINTR){
2378
perror_plus("nanosleep");
2379
}
2380
}
2381
2382
errno = old_errno;
2383
return 0;
2384
}
2385
2386
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
2389
struct ifreq network;
2390
unsigned int if_index = if_nametoindex(interface);
2391
if(if_index == 0){
2392
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2393
errno = old_errno;
2394
return ENXIO;
2395
}
2396
if(interface_is_up(interface)){
2397
int ret_errno = 0;
2398
int ioctl_errno = 0;
2399
if(not get_flags(interface, &network) and debug){
2400
ret_errno = errno;
2401
fprintf_plus(stderr, "Failed to get flags for interface "
2402
"\"%s\"\n", interface);
2403
errno = old_errno;
2404
return ret_errno;
2405
}
2406
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2407
2408
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2409
if(sd == -1){
2410
ret_errno = errno;
2411
perror_plus("socket");
2412
errno = old_errno;
2413
return ret_errno;
2414
}
2415
2416
if(debug){
2417
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2418
interface);
2419
}
2420
2421
/* Raise privileges */
2422
ret_errno = raise_privileges();
2423
if(ret_errno != 0){
2424
errno = ret_errno;
2425
perror_plus("Failed to raise privileges");
2426
}
2427
2428
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2429
ioctl_errno = errno;
2430
2431
/* If raise_privileges() succeeded above */
2432
if(ret_errno == 0){
2433
/* Lower privileges */
2434
ret_errno = lower_privileges();
2435
if(ret_errno != 0){
2436
errno = ret_errno;
2437
perror_plus("Failed to lower privileges");
2438
}
2439
}
2440
2441
/* Close the socket */
2442
int ret = close(sd);
2443
if(ret == -1){
2444
perror_plus("close");
2445
}
2446
2447
if(ret_setflags == -1){
2448
errno = ioctl_errno;
2449
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2450
errno = old_errno;
2451
return ioctl_errno;
2452
}
2453
} else if(debug){
2454
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2455
interface);
2456
}
2457
2458
errno = old_errno;
2459
return 0;
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
2460
1524
}
2461
1525
2462
1526
int main(int argc, char *argv[]){
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2467
":%PROFILE_ULTRA",
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2471
#else
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2473
#endif
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
2476
1527
AvahiSServiceBrowser *sb = NULL;
2477
error_t ret_errno;
1528
int error;
2478
1529
int ret;
2479
1530
intmax_t tmpmax;
2480
1531
char *tmp;
2481
1532
int exitcode = EXIT_SUCCESS;
2482
char *interfaces_to_take_down = NULL;
2483
size_t interfaces_to_take_down_size = 0;
2484
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2485
char old_tempdir[] = "/tmp/mandosXXXXXX";
2486
char *tempdir = NULL;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2487
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
1542
const char *seckey = PATHDIR "/" SECKEY;
2489
1543
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2493
#endif
2494
const char *dh_params_file = NULL;
2495
char *interfaces_hooks = NULL;
2496
1544
2497
1545
bool gnutls_initialized = false;
2498
1546
bool gpgme_initialized = false;
2544
1592
{ .name = "pubkey", .key = 'p',
2545
1593
.arg = "FILE",
2546
1594
.doc = "OpenPGP public key file base name",
2547
.group = 1 },
2548
{ .name = "tls-privkey", .key = 't',
2549
.arg = "FILE",
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2552
#else
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2554
#endif
2555
.group = 1 },
2556
{ .name = "tls-pubkey", .key = 'T',
2557
.arg = "FILE",
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2560
#else
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
#endif
2563
.group = 1 },
1595
.group = 2 },
2564
1596
{ .name = "dh-bits", .key = 129,
2565
1597
.arg = "BITS",
2566
1598
.doc = "Bit length of the prime number used in the"
2567
1599
" Diffie-Hellman key exchange",
2568
1600
.group = 2 },
2569
{ .name = "dh-params", .key = 134,
2570
.arg = "FILE",
2571
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2572
" for the Diffie-Hellman key exchange",
2573
.group = 2 },
2574
1601
{ .name = "priority", .key = 130,
2575
1602
.arg = "STRING",
2576
1603
.doc = "GnuTLS priority string for the TLS handshake",
2610
1637
connect_to = arg;
2611
1638
break;
2612
1639
case 'i': /* --interface */
2613
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2614
arg, (int)',');
2615
if(ret_errno != 0){
2616
argp_error(state, "%s", strerror(ret_errno));
2617
}
1640
interface = arg;
2618
1641
break;
2619
1642
case 's': /* --seckey */
2620
1643
seckey = arg;
2622
1645
case 'p': /* --pubkey */
2623
1646
pubkey = arg;
2624
1647
break;
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2627
tls_privkey = arg;
2628
#endif
2629
break;
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2632
tls_pubkey = arg;
2633
#endif
2634
break;
2635
1648
case 129: /* --dh-bits */
2636
1649
errno = 0;
2637
1650
tmpmax = strtoimax(arg, &tmp, 10);
2641
1654
}
2642
1655
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2643
1656
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2647
1657
case 130: /* --priority */
2648
1658
mc.priority = arg;
2649
1659
break;
2672
1682
argp_state_help(state, state->out_stream,
2673
1683
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
1684
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2676
1685
case -3: /* --usage */
2677
1686
argp_state_help(state, state->out_stream,
2678
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2680
1688
case 'V': /* --version */
2681
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2682
1690
exit(argp_err_exit_status);
2691
1699
.args_doc = "",
2692
1700
.doc = "Mandos client -- Get and decrypt"
2693
1701
" passwords from a Mandos server" };
2694
ret_errno = argp_parse(&argp, argc, argv,
2695
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2696
switch(ret_errno){
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
2697
1705
case 0:
2698
1706
break;
2699
1707
case ENOMEM:
2700
1708
default:
2701
errno = ret_errno;
1709
errno = ret;
2702
1710
perror_plus("argp_parse");
2703
1711
exitcode = EX_OSERR;
2704
1712
goto end;
2707
1715
goto end;
2708
1716
}
2709
1717
}
2710
1718
2711
1719
{
2712
1720
/* Work around Debian bug #633582:
2713
<https://bugs.debian.org/633582> */
1721
<http://bugs.debian.org/633582> */
2714
1722
2715
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2719
perror_plus("Failed to raise privileges");
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2720
1728
} else {
2721
1729
struct stat st;
2722
1730
2737
1745
}
2738
1746
}
2739
1747
}
2740
close(seckey_fd);
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
2741
1749
}
2742
1750
}
2743
1751
2744
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2745
1753
int pubkey_fd = open(pubkey, O_RDONLY);
2746
1754
if(pubkey_fd == -1){
2758
1766
}
2759
1767
}
2760
1768
}
2761
close(pubkey_fd);
2762
}
2763
}
2764
2765
if(dh_params_file != NULL
2766
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2767
int dhparams_fd = open(dh_params_file, O_RDONLY);
2768
if(dhparams_fd == -1){
2769
perror_plus("open");
2770
} else {
2771
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2772
if(ret == -1){
2773
perror_plus("fstat");
2774
} else {
2775
if(S_ISREG(st.st_mode)
2776
and st.st_uid == 0 and st.st_gid == 0){
2777
ret = fchown(dhparams_fd, uid, gid);
2778
if(ret == -1){
2779
perror_plus("fchown");
2780
}
2781
}
2782
}
2783
close(dhparams_fd);
2784
}
2785
}
2786
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
2787
1773
/* Lower privileges */
2788
ret = lower_privileges();
2789
if(ret != 0){
2790
errno = ret;
2791
perror_plus("Failed to lower privileges");
2792
}
2793
}
2794
}
2795
2796
/* Remove invalid interface names (except "none") */
2797
{
2798
char *interface = NULL;
2799
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2800
interface))){
2801
if(strcmp(interface, "none") != 0
2802
and if_nametoindex(interface) == 0){
2803
if(interface[0] != '\0'){
2804
fprintf_plus(stderr, "Not using nonexisting interface"
2805
" \"%s\"\n", interface);
2806
}
2807
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2808
interface = NULL;
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2809
1778
}
2810
1779
}
2811
1780
}
2812
1781
2813
1782
/* Run network hooks */
2814
{
2815
if(mc.interfaces != NULL){
2816
interfaces_hooks = malloc(mc.interfaces_size);
2817
if(interfaces_hooks == NULL){
2818
perror_plus("malloc");
2819
goto end;
2820
}
2821
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2822
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2823
}
2824
run_network_hooks("start", interfaces_hooks != NULL ?
2825
interfaces_hooks : "", delay);
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2826
1785
}
2827
1786
2828
1787
if(not debug){
2829
1788
avahi_set_log_function(empty_log);
2830
1789
}
2831
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
2832
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2833
1824
from the signal handler */
2834
1825
/* Initialize the pseudo-RNG for Avahi */
2835
1826
srand((unsigned int) time(NULL));
2836
simple_poll = avahi_simple_poll_new();
2837
if(simple_poll == NULL){
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2838
1829
fprintf_plus(stderr,
2839
1830
"Avahi: Failed to create simple poll object.\n");
2840
1831
exitcode = EX_UNAVAILABLE;
2904
1895
}
2905
1896
}
2906
1897
2907
/* If no interfaces were specified, make a list */
2908
if(mc.interfaces == NULL){
2909
struct dirent **direntries = NULL;
2910
/* Look for any good interfaces */
2911
ret = scandir(sys_class_net, &direntries, good_interface,
2912
alphasort);
2913
if(ret >= 1){
2914
/* Add all found interfaces to interfaces list */
2915
for(int i = 0; i < ret; ++i){
2916
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2917
direntries[i]->d_name);
2918
if(ret_errno != 0){
2919
errno = ret_errno;
2920
perror_plus("argz_add");
2921
free(direntries[i]);
2922
continue;
2923
}
2924
if(debug){
2925
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2926
direntries[i]->d_name);
2927
}
2928
free(direntries[i]);
2929
}
2930
free(direntries);
2931
} else {
2932
if(ret == 0){
2933
free(direntries);
2934
}
2935
fprintf_plus(stderr, "Could not find a network interface\n");
2936
exitcode = EXIT_FAILURE;
2937
goto end;
2938
}
2939
}
2940
2941
/* Bring up interfaces which are down, and remove any "none"s */
2942
{
2943
char *interface = NULL;
2944
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2945
interface))){
2946
/* If interface name is "none", stop bringing up interfaces.
2947
Also remove all instances of "none" from the list */
2948
if(strcmp(interface, "none") == 0){
2949
argz_delete(&mc.interfaces, &mc.interfaces_size,
2950
interface);
2951
interface = NULL;
2952
while((interface = argz_next(mc.interfaces,
2953
mc.interfaces_size, interface))){
2954
if(strcmp(interface, "none") == 0){
2955
argz_delete(&mc.interfaces, &mc.interfaces_size,
2956
interface);
2957
interface = NULL;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2958
1983
}
2959
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2960
2002
break;
2961
2003
}
2962
bool interface_was_up = interface_is_up(interface);
2963
errno = bring_up_interface(interface, delay);
2964
if(not interface_was_up){
2965
if(errno != 0){
2966
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2967
" %s\n", interface, strerror(errno));
2968
} else {
2969
errno = argz_add(&interfaces_to_take_down,
2970
&interfaces_to_take_down_size,
2971
interface);
2972
if(errno != 0){
2973
perror_plus("argz_add");
2974
}
2975
}
2976
}
2977
}
2978
if(debug and (interfaces_to_take_down == NULL)){
2979
fprintf_plus(stderr, "No interfaces were brought up\n");
2980
}
2981
}
2982
2983
/* If we only got one interface, explicitly use only that one */
2984
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2985
if(debug){
2986
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2987
mc.interfaces);
2988
}
2989
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2990
2033
}
2991
2034
2992
2035
if(quit_now){
2993
2036
goto end;
2994
2037
}
2995
2038
2996
#if GNUTLS_VERSION_NUMBER >= 0x030606
2997
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2998
#elif GNUTLS_VERSION_NUMBER < 0x030600
2999
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3000
#else
3001
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3002
#endif
2039
ret = init_gnutls_global(pubkey, seckey);
3003
2040
if(ret == -1){
3004
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
3005
2042
exitcode = EX_UNAVAILABLE;
3012
2049
goto end;
3013
2050
}
3014
2051
3015
/* Try /run/tmp before /tmp */
3016
tempdir = mkdtemp(run_tempdir);
3017
if(tempdir == NULL and errno == ENOENT){
3018
if(debug){
3019
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3020
run_tempdir, old_tempdir);
3021
}
3022
tempdir = mkdtemp(old_tempdir);
3023
}
3024
if(tempdir == NULL){
2052
if(mkdtemp(tempdir) == NULL){
3025
2053
perror_plus("mkdtemp");
3026
2054
goto end;
3027
2055
}
2056
tempdir_created = true;
3028
2057
3029
2058
if(quit_now){
3030
2059
goto end;
3031
2060
}
3032
2061
3033
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
3034
2063
fprintf_plus(stderr, "init_gpgme failed\n");
3035
2064
exitcode = EX_UNAVAILABLE;
3036
2065
goto end;
3046
2075
/* Connect directly, do not use Zeroconf */
3047
2076
/* (Mainly meant for debugging) */
3048
2077
char *address = strrchr(connect_to, ':');
3049
3050
2078
if(address == NULL){
3051
2079
fprintf_plus(stderr, "No colon in address\n");
3052
2080
exitcode = EX_USAGE;
3057
2085
goto end;
3058
2086
}
3059
2087
3060
in_port_t port;
2088
uint16_t port;
3061
2089
errno = 0;
3062
2090
tmpmax = strtoimax(address+1, &tmp, 10);
3063
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3064
or tmpmax != (in_port_t)tmpmax){
2092
or tmpmax != (uint16_t)tmpmax){
3065
2093
fprintf_plus(stderr, "Bad port number\n");
3066
2094
exitcode = EX_USAGE;
3067
2095
goto end;
3068
2096
}
3069
2097
3070
2098
if(quit_now){
3071
2099
goto end;
3072
2100
}
3073
2101
3074
port = (in_port_t)tmpmax;
2102
port = (uint16_t)tmpmax;
3075
2103
*address = '\0';
3076
2104
/* Colon in address indicates IPv6 */
3077
2105
int af;
3093
2121
}
3094
2122
3095
2123
while(not quit_now){
3096
ret = start_mandos_communication(address, port, if_index, af,
3097
&mc);
2124
ret = start_mandos_communication(address, port, if_index, af);
3098
2125
if(quit_now or ret == 0){
3099
2126
break;
3100
2127
}
3102
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
3103
2130
(int)retry_interval);
3104
2131
}
3105
sleep((unsigned int)retry_interval);
2132
sleep((int)retry_interval);
3106
2133
}
3107
2134
3108
if(not quit_now){
2135
if (not quit_now){
3109
2136
exitcode = EXIT_SUCCESS;
3110
2137
}
3111
2138
3126
2153
config.publish_domain = 0;
3127
2154
3128
2155
/* Allocate a new server */
3129
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3130
&config, NULL, NULL, &ret);
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
3131
2159
3132
2160
/* Free the Avahi configuration data */
3133
2161
avahi_server_config_free(&config);
3136
2164
/* Check if creating the Avahi server object succeeded */
3137
2165
if(mc.server == NULL){
3138
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3139
avahi_strerror(ret));
2167
avahi_strerror(error));
3140
2168
exitcode = EX_UNAVAILABLE;
3141
2169
goto end;
3142
2170
}
3148
2176
/* Create the Avahi service browser */
3149
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
3150
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3151
NULL, 0, browse_callback,
3152
(void *)&mc);
2179
NULL, 0, browse_callback, NULL);
3153
2180
if(sb == NULL){
3154
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3155
2182
avahi_strerror(avahi_server_errno(mc.server)));
3166
2193
if(debug){
3167
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
3168
2195
}
3169
3170
ret = avahi_loop_with_timeout(simple_poll,
3171
(int)(retry_interval * 1000), &mc);
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
3172
2199
if(debug){
3173
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3174
2201
(ret == 0) ? "successfully" : "with error");
3177
2204
end:
3178
2205
3179
2206
if(debug){
3180
if(signal_received){
3181
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3182
argv[0], signal_received,
3183
strsignal(signal_received));
3184
} else {
3185
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3186
}
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
2208
}
3188
2209
3189
2210
/* Cleanup things */
3190
free(mc.interfaces);
3191
3192
2211
if(sb != NULL)
3193
2212
avahi_s_service_browser_free(sb);
3194
2213
3195
2214
if(mc.server != NULL)
3196
2215
avahi_server_free(mc.server);
3197
2216
3198
if(simple_poll != NULL)
3199
avahi_simple_poll_free(simple_poll);
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
3200
2219
3201
2220
if(gnutls_initialized){
3202
2221
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
3203
2223
gnutls_dh_params_deinit(mc.dh_params);
3204
2224
}
3205
2225
3213
2233
mc.current_server->prev->next = NULL;
3214
2234
while(mc.current_server != NULL){
3215
2235
server *next = mc.current_server->next;
3216
#ifdef __GNUC__
3217
#pragma GCC diagnostic push
3218
#pragma GCC diagnostic ignored "-Wcast-qual"
3219
#endif
3220
free((char *)(mc.current_server->ip));
3221
#ifdef __GNUC__
3222
#pragma GCC diagnostic pop
3223
#endif
3224
2236
free(mc.current_server);
3225
2237
mc.current_server = next;
3226
2238
}
3227
2239
}
3228
2240
3229
/* Re-raise privileges */
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
3230
2245
{
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
3234
perror_plus("Failed to raise privileges");
3235
} else {
3236
3237
/* Run network hooks */
3238
run_network_hooks("stop", interfaces_hooks != NULL ?
3239
interfaces_hooks : "", delay);
3240
3241
/* Take down the network interfaces which were brought up */
3242
{
3243
char *interface = NULL;
3244
while((interface = argz_next(interfaces_to_take_down,
3245
interfaces_to_take_down_size,
3246
interface))){
3247
ret = take_down_interface(interface);
3248
if(ret != 0){
3249
errno = ret;
3250
perror_plus("Failed to take down interface");
3251
}
3252
}
3253
if(debug and (interfaces_to_take_down == NULL)){
3254
fprintf_plus(stderr, "No interfaces needed to be taken"
3255
" down\n");
3256
}
3257
}
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
3258
2250
}
3259
2251
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
3263
perror_plus("Failed to lower privileges permanently");
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
3264
2268
}
3265
2269
}
3266
3267
free(interfaces_to_take_down);
3268
free(interfaces_hooks);
3269
3270
void clean_dir_at(int base, const char * const dirname,
3271
uintmax_t level){
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
2277
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
3272
2279
struct dirent **direntries = NULL;
3273
int dret;
3274
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3275
O_RDONLY
3276
| O_NOFOLLOW
3277
| O_DIRECTORY
3278
| O_PATH));
3279
if(dir_fd == -1){
3280
perror_plus("open");
3281
return;
3282
}
3283
int numentries = scandirat(dir_fd, ".", &direntries,
3284
notdotentries, alphasort);
3285
if(numentries >= 0){
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
3286
2284
for(int i = 0; i < numentries; i++){
3287
if(debug){
3288
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3289
dirname, direntries[i]->d_name);
3290
}
3291
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3292
if(dret == -1){
3293
if(errno == EISDIR){
3294
dret = unlinkat(dir_fd, direntries[i]->d_name,
3295
AT_REMOVEDIR);
3296
}
3297
if((dret == -1) and (errno == ENOTEMPTY)
3298
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3299
== 0) and (level == 0)){
3300
/* Recurse only in this special case */
3301
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3302
dret = 0;
3303
}
3304
if((dret == -1) and (errno != ENOENT)){
3305
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3306
direntries[i]->d_name, strerror(errno));
3307
}
3308
}
3309
free(direntries[i]);
3310
}
3311
3312
/* need to clean even if 0 because man page doesn't specify */
3313
free(direntries);
3314
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3315
if(dret == -1 and errno != ENOENT){
3316
perror_plus("rmdir");
3317
}
3318
} else {
3319
perror_plus("scandirat");
3320
}
3321
close(dir_fd);
3322
}
3323
3324
/* Removes the GPGME temp directory and all files inside */
3325
if(tempdir != NULL){
3326
clean_dir_at(-1, tempdir, 0);
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2299
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2310
}
3327
2311
}
3328
2312
3329
2313
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0