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- Committer: Teddy Hogeborn
- Date: 2012-06-09 23:41:07 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120609234107-vm6zilzz0y6aihsm
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
raise_privileges_permanently, lower_privileges): Return error_t and
save old errno
before calling any
other function.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
43
stdout, ferror(), remove() */
45
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
47
strtof(), abort() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
57
55
opendir(), DIR */
58
56
#include <sys/stat.h> /* open(), S_ISREG */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
64
#include <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
138
uid_t uid = 65534;
161
139
gid_t gid = 65534;
162
140
163
141
/* Doubly linked list that need to be circularly linked when used */
164
142
typedef struct server{
165
143
const char *ip;
166
in_port_t port;
144
uint16_t port;
167
145
AvahiIfIndex if_index;
168
146
int af;
169
147
struct timespec last_seen;
173
151
174
152
/* Used for passing in values through the Avahi callback functions */
175
153
typedef struct {
154
AvahiSimplePoll *simple_poll;
176
155
AvahiServer *server;
177
156
gnutls_certificate_credentials_t cred;
178
157
unsigned int dh_bits;
180
159
const char *priority;
181
160
gpgme_ctx_t ctx;
182
161
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
185
162
} mandos_context;
186
163
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
189
169
190
170
sig_atomic_t quit_now = 0;
191
171
int signal_received = 0;
199
179
perror(print_text);
200
180
}
201
181
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
__attribute__((format (gnu_printf, 2, 3)))
203
183
int fprintf_plus(FILE *stream, const char *format, ...){
204
184
va_list ap;
205
185
va_start (ap, format);
206
186
207
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
188
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
190
}
211
191
212
192
/*
214
194
* bytes. "buffer_capacity" is how much is currently allocated,
215
195
* "buffer_length" is how much is already used.
216
196
*/
217
__attribute__((nonnull, warn_unused_result))
218
197
size_t incbuffer(char **buffer, size_t buffer_length,
219
198
size_t buffer_capacity){
220
199
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;
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
201
if(buffer == NULL){
227
202
return 0;
228
203
}
229
*buffer = new_buf;
230
204
buffer_capacity += BUFFER_SIZE;
231
205
}
232
206
return buffer_capacity;
233
207
}
234
208
235
209
/* 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){
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
239
212
int ret;
240
213
server *new_server = malloc(sizeof(server));
241
214
if(new_server == NULL){
248
221
.af = af };
249
222
if(new_server->ip == NULL){
250
223
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
224
return false;
267
225
}
268
226
/* Special case of first server */
269
if(*current_server == NULL){
227
if (mc.current_server == NULL){
270
228
new_server->next = new_server;
271
229
new_server->prev = new_server;
272
*current_server = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
273
232
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
277
235
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
279
242
}
280
243
return true;
281
244
}
282
245
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
246
/*
336
247
* Initialize GPGME.
337
248
*/
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){
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
343
251
gpgme_error_t rc;
344
252
gpgme_engine_info_t engine_info;
345
253
254
346
255
/*
347
256
* Helper function to insert pub and seckey to the engine keyring.
348
257
*/
349
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
350
259
int ret;
351
260
int fd;
352
261
gpgme_data_t pgp_data;
357
266
return false;
358
267
}
359
268
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
410
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
270
if(rc != GPG_ERR_NO_ERROR){
412
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
414
273
return false;
415
274
}
416
275
417
rc = gpgme_op_import(mc->ctx, pgp_data);
276
rc = gpgme_op_import(mc.ctx, pgp_data);
418
277
if(rc != GPG_ERR_NO_ERROR){
419
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
420
279
gpgme_strsource(rc), gpgme_strerror(rc));
421
280
return false;
422
281
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
498
282
499
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
284
if(ret == -1){
501
285
perror_plus("close");
502
286
}
539
323
}
540
324
541
325
/* Create new GPGME "context" */
542
rc = gpgme_new(&(mc->ctx));
326
rc = gpgme_new(&(mc.ctx));
543
327
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
546
331
return false;
547
332
}
548
333
557
342
* Decrypt OpenPGP data.
558
343
* Returns -1 on error
559
344
*/
560
__attribute__((nonnull, warn_unused_result))
561
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
562
346
size_t crypto_size,
563
char **plaintext,
564
mandos_context *mc){
347
char **plaintext){
565
348
gpgme_data_t dh_crypto, dh_plain;
566
349
gpgme_error_t rc;
567
350
ssize_t ret;
584
367
/* Create new empty GPGME data buffer for the plaintext */
585
368
rc = gpgme_data_new(&dh_plain);
586
369
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
588
372
gpgme_strsource(rc), gpgme_strerror(rc));
589
373
gpgme_data_release(dh_crypto);
590
374
return -1;
592
376
593
377
/* Decrypt data from the cryptotext data buffer to the plaintext
594
378
data buffer */
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
596
380
if(rc != GPG_ERR_NO_ERROR){
597
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
598
382
gpgme_strsource(rc), gpgme_strerror(rc));
599
383
plaintext_length = -1;
600
384
if(debug){
601
385
gpgme_decrypt_result_t result;
602
result = gpgme_op_decrypt_result(mc->ctx);
386
result = gpgme_op_decrypt_result(mc.ctx);
603
387
if(result == NULL){
604
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
605
389
} 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");
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
612
394
if(result->file_name != NULL){
613
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
614
396
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
397
gpgme_recipient_t recipient;
398
recipient = result->recipients;
399
while(recipient != NULL){
618
400
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);
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
621
404
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
623
408
}
624
409
}
625
410
}
681
466
return plaintext_length;
682
467
}
683
468
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);
469
static const char * safer_gnutls_strerror(int value){
470
const char *ret = gnutls_strerror(value); /* Spurious warning from
471
-Wunreachable-code */
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
695
475
}
696
476
697
477
/* GnuTLS log function callback */
698
__attribute__((nonnull))
699
478
static void debuggnutls(__attribute__((unused)) int level,
700
479
const char* string){
701
480
fprintf_plus(stderr, "GnuTLS: %s", string);
702
481
}
703
482
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
705
483
static int init_gnutls_global(const char *pubkeyfilename,
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
mandos_context *mc){
484
const char *seckeyfilename){
709
485
int ret;
710
486
711
487
if(debug){
712
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
713
489
}
714
490
491
ret = gnutls_global_init();
492
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
495
return -1;
496
}
497
715
498
if(debug){
716
499
/* "Use a log level over 10 to enable all debugging options."
717
500
* - GnuTLS manual
721
504
}
722
505
723
506
/* OpenPGP credentials */
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
725
508
if(ret != GNUTLS_E_SUCCESS){
726
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
510
safer_gnutls_strerror(ret));
511
gnutls_global_deinit();
728
512
return -1;
729
513
}
730
514
731
515
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
734
518
pubkeyfilename,
735
519
seckeyfilename);
736
520
}
737
521
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
522
ret = gnutls_certificate_set_openpgp_key_file
752
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
753
524
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
525
if(ret != GNUTLS_E_SUCCESS){
758
526
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
760
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
530
safer_gnutls_strerror(ret));
764
532
}
765
533
766
534
/* GnuTLS server initialization */
767
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
768
536
if(ret != GNUTLS_E_SUCCESS){
769
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
770
538
" initialization: %s\n",
771
539
safer_gnutls_strerror(ret));
772
540
goto globalfail;
773
541
}
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
}
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
546
goto globalfail;
547
}
548
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
956
550
957
551
return 0;
958
552
959
553
globalfail:
960
554
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
555
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_global_deinit();
557
gnutls_dh_params_deinit(mc.dh_params);
963
558
return -1;
964
559
}
965
560
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
968
mandos_context *mc){
561
static int init_gnutls_session(gnutls_session_t *session){
969
562
int ret;
970
563
/* GnuTLS session creation */
971
564
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
));
565
ret = gnutls_init(session, GNUTLS_SERVER);
980
566
if(quit_now){
981
567
return -1;
982
568
}
990
576
{
991
577
const char *err;
992
578
do {
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
994
580
if(quit_now){
995
581
gnutls_deinit(*session);
996
582
return -1;
1007
593
1008
594
do {
1009
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1010
mc->cred);
596
mc.cred);
1011
597
if(quit_now){
1012
598
gnutls_deinit(*session);
1013
599
return -1;
1023
609
/* ignore client certificate if any. */
1024
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1025
611
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
1026
614
return 0;
1027
615
}
1028
616
1030
618
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
619
__attribute__((unused)) const char *txt){}
1032
620
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
621
/* 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,
622
static int start_mandos_communication(const char *ip, uint16_t port,
1202
623
AvahiIfIndex if_index,
1203
int af, mandos_context *mc){
624
int af){
1204
625
int ret, tcp_sd = -1;
1205
626
ssize_t sret;
1206
struct sockaddr_storage to;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
1207
631
char *buffer = NULL;
1208
632
char *decrypted_buffer = NULL;
1209
633
size_t buffer_length = 0;
1212
636
int retval = -1;
1213
637
gnutls_session_t session;
1214
638
int pf; /* Protocol family */
1215
bool route_added = false;
1216
639
1217
640
errno = 0;
1218
641
1234
657
return -1;
1235
658
}
1236
659
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);
660
ret = init_gnutls_session(&session);
1271
661
if(ret != 0){
1272
662
return -1;
1273
663
}
1274
664
1275
665
if(debug){
1276
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1277
PRIuMAX "\n", ip, (uintmax_t)port);
667
PRIu16 "\n", ip, port);
1278
668
}
1279
669
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
1281
671
if(tcp_sd < 0){
1282
672
int e = errno;
1283
673
perror_plus("socket");
1290
680
goto mandos_end;
1291
681
}
1292
682
683
memset(&to, 0, sizeof(to));
1293
684
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);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1297
687
} 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);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
1301
690
}
1302
691
if(ret < 0 ){
1303
692
int e = errno;
1312
701
goto mandos_end;
1313
702
}
1314
703
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)){
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
-Wconversion and
706
-Wunreachable-code */
707
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
710
-Wunreachable-code*/
1318
711
if(if_index == AVAHI_IF_UNSPEC){
1319
712
fprintf_plus(stderr, "An IPv6 link-local address is"
1320
713
" incomplete without a network interface\n");
1322
715
goto mandos_end;
1323
716
}
1324
717
/* Set the network interface number as scope */
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
to.in6.sin6_scope_id = (uint32_t)if_index;
1326
719
}
1327
720
} else {
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
to.in.sin_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
1329
724
}
1330
725
1331
726
if(quit_now){
1339
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1340
735
perror_plus("if_indextoname");
1341
736
} else {
1342
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1343
"\n", ip, interface, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
1344
739
}
1345
740
} else {
1346
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1347
ip, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
1348
743
}
1349
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1350
745
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;
746
const char *pcret;
747
if(af == AF_INET6){
748
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
sizeof(addrstr));
750
} else {
751
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
752
sizeof(addrstr));
753
}
754
if(pcret == NULL){
755
perror_plus("inet_ntop");
756
} else {
757
if(strcmp(addrstr, ip) != 0){
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
759
}
760
}
761
}
762
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
768
if(af == AF_INET6){
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
} else {
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
}
773
if(ret < 0){
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
1431
785
}
1432
786
1433
787
const char *out = mandos_protocol_version;
1584
938
if(buffer_length > 0){
1585
939
ssize_t decrypted_buffer_size;
1586
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1587
&decrypted_buffer, mc);
941
&decrypted_buffer);
1588
942
if(decrypted_buffer_size >= 0){
1589
943
1590
clearerr(stdout);
1591
944
written = 0;
1592
945
while(written < (size_t) decrypted_buffer_size){
1593
946
if(quit_now){
1609
962
}
1610
963
written += (size_t)ret;
1611
964
}
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
965
retval = 0;
1623
966
}
1624
967
}
1627
970
1628
971
mandos_end:
1629
972
{
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
973
int e = errno;
1637
974
free(decrypted_buffer);
1638
975
free(buffer);
1639
976
if(tcp_sd >= 0){
1640
ret = close(tcp_sd);
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1641
978
}
1642
979
if(ret == -1){
1643
980
if(e == 0){
1668
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
1669
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1670
1007
flags,
1671
void *mc){
1672
if(r == NULL){
1673
return;
1674
}
1008
AVAHI_GCC_UNUSED void* userdata){
1009
assert(r);
1675
1010
1676
1011
/* Called whenever a service has been resolved successfully or
1677
1012
timed out */
1678
1013
1679
1014
if(quit_now){
1680
avahi_s_service_resolver_free(r);
1681
1015
return;
1682
1016
}
1683
1017
1687
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1688
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1689
1023
domain,
1690
avahi_strerror(avahi_server_errno
1691
(((mandos_context*)mc)->server)));
1024
avahi_strerror(avahi_server_errno(mc.server)));
1692
1025
break;
1693
1026
1694
1027
case AVAHI_RESOLVER_FOUND:
1700
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1701
1034
host_name, ip, (intmax_t)interface, port);
1702
1035
}
1703
int ret = start_mandos_communication(ip, (in_port_t)port,
1704
interface,
1705
avahi_proto_to_af(proto),
1706
mc);
1036
int ret = start_mandos_communication(ip, port, interface,
1037
avahi_proto_to_af(proto));
1707
1038
if(ret == 0){
1708
avahi_simple_poll_quit(simple_poll);
1039
avahi_simple_poll_quit(mc.simple_poll);
1709
1040
} else {
1710
if(not add_server(ip, (in_port_t)port, interface,
1711
avahi_proto_to_af(proto),
1712
&((mandos_context*)mc)->current_server)){
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1713
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1714
1044
" list\n", name);
1715
1045
}
1728
1058
const char *domain,
1729
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1730
1060
flags,
1731
void *mc){
1732
if(b == NULL){
1733
return;
1734
}
1061
AVAHI_GCC_UNUSED void* userdata){
1062
assert(b);
1735
1063
1736
1064
/* Called whenever a new services becomes available on the LAN or
1737
1065
is removed from the LAN */
1745
1073
case AVAHI_BROWSER_FAILURE:
1746
1074
1747
1075
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);
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
1751
1078
return;
1752
1079
1753
1080
case AVAHI_BROWSER_NEW:
1756
1083
the callback function is called the Avahi server will free the
1757
1084
resolver for us. */
1758
1085
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)
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1763
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1764
1090
" %s\n", name,
1765
avahi_strerror(avahi_server_errno
1766
(((mandos_context*)mc)->server)));
1091
avahi_strerror(avahi_server_errno(mc.server)));
1767
1092
break;
1768
1093
1769
1094
case AVAHI_BROWSER_REMOVE:
1788
1113
signal_received = sig;
1789
1114
int old_errno = errno;
1790
1115
/* set main loop to exit */
1791
if(simple_poll != NULL){
1792
avahi_simple_poll_quit(simple_poll);
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1793
1118
}
1794
1119
errno = old_errno;
1795
1120
}
1796
1121
1797
__attribute__((nonnull, warn_unused_result))
1798
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1799
1123
int ret;
1800
int old_errno;
1801
1124
1802
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1803
1126
if(s < 0){
1804
old_errno = errno;
1805
1127
perror_plus("socket");
1806
errno = old_errno;
1807
1128
return false;
1808
1129
}
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1130
strcpy(ifr->ifr_name, ifname);
1811
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1812
1132
if(ret == -1){
1813
1133
if(debug){
1814
old_errno = errno;
1815
1134
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
1135
}
1823
1136
return false;
1824
1137
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
1138
return true;
1831
1139
}
1832
1140
1833
__attribute__((nonnull, warn_unused_result))
1834
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1835
1142
1836
1143
/* Reject the loopback device */
1878
1185
* corresponds to an acceptable network device.
1879
1186
* (This function is passed to scandir(3) as a filter function.)
1880
1187
*/
1881
__attribute__((nonnull, warn_unused_result))
1882
1188
int good_interface(const struct dirent *if_entry){
1883
1189
if(if_entry->d_name[0] == '.'){
1884
1190
return 0;
1900
1206
}
1901
1207
1902
1208
/*
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))
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1937
1251
int notdotentries(const struct dirent *direntry){
1938
1252
/* Skip "." and ".." */
1939
1253
if(direntry->d_name[0] == '.'
1946
1260
}
1947
1261
1948
1262
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1950
1263
int runnable_hook(const struct dirent *direntry){
1951
1264
int ret;
1952
1265
size_t sret;
1960
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1961
1274
"abcdefghijklmnopqrstuvwxyz"
1962
1275
"0123456789"
1963
"_.-");
1276
"_-");
1964
1277
if((direntry->d_name)[sret] != '\0'){
1965
1278
/* Contains non-allowed characters */
1966
1279
if(debug){
1970
1283
return 0;
1971
1284
}
1972
1285
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1974
1294
if(ret == -1){
1975
1295
if(debug){
1976
1296
perror_plus("Could not stat hook");
2000
1320
return 1;
2001
1321
}
2002
1322
2003
__attribute__((nonnull, warn_unused_result))
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2005
mandos_context *mc){
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2006
1324
int ret;
2007
1325
struct timespec now;
2008
1326
struct timespec waited_time;
2009
1327
intmax_t block_time;
2010
1328
2011
1329
while(true){
2012
if(mc->current_server == NULL){
2013
if(debug){
1330
if(mc.current_server == NULL){
1331
if (debug){
2014
1332
fprintf_plus(stderr, "Wait until first server is found."
2015
1333
" No timeout!\n");
2016
1334
}
2017
1335
ret = avahi_simple_poll_iterate(s, -1);
2018
1336
} else {
2019
if(debug){
1337
if (debug){
2020
1338
fprintf_plus(stderr, "Check current_server if we should run"
2021
1339
" it, or wait\n");
2022
1340
}
2029
1347
/* Calculating in ms how long time between now and server
2030
1348
who we visted longest time ago. Now - last seen. */
2031
1349
waited_time.tv_sec = (now.tv_sec
2032
- mc->current_server->last_seen.tv_sec);
1350
- mc.current_server->last_seen.tv_sec);
2033
1351
waited_time.tv_nsec = (now.tv_nsec
2034
- mc->current_server->last_seen.tv_nsec);
1352
- mc.current_server->last_seen.tv_nsec);
2035
1353
/* total time is 10s/10,000ms.
2036
1354
Converting to s from ms by dividing by 1,000,
2037
1355
and ns to ms by dividing by 1,000,000. */
2039
1357
- ((intmax_t)waited_time.tv_sec * 1000))
2040
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
2041
1359
2042
if(debug){
1360
if (debug){
2043
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2044
1362
block_time);
2045
1363
}
2046
1364
2047
1365
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);
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
2052
1370
if(ret == 0){
2053
avahi_simple_poll_quit(s);
1371
avahi_simple_poll_quit(mc.simple_poll);
2054
1372
return 0;
2055
1373
}
2056
1374
ret = clock_gettime(CLOCK_MONOTONIC,
2057
&mc->current_server->last_seen);
1375
&mc.current_server->last_seen);
2058
1376
if(ret == -1){
2059
1377
perror_plus("clock_gettime");
2060
1378
return -1;
2061
1379
}
2062
mc->current_server = mc->current_server->next;
1380
mc.current_server = mc.current_server->next;
2063
1381
block_time = 0; /* Call avahi to find new Mandos
2064
1382
servers, but don't block */
2065
1383
}
2067
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
2068
1386
}
2069
1387
if(ret != 0){
2070
if(ret > 0 or errno != EINTR){
1388
if (ret > 0 or errno != EINTR){
2071
1389
return (ret != 1) ? ret : 0;
2072
1390
}
2073
1391
}
2074
1392
}
2075
1393
}
2076
1394
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
1395
/* Set effective uid to 0, return errno */
1396
error_t raise_privileges(void){
1397
error_t old_errno = errno;
1398
error_t ret_errno = 0;
1399
if(seteuid(0) == -1){
1400
ret_errno = errno;
1401
perror_plus("seteuid");
1402
}
1403
errno = old_errno;
1404
return ret_errno;
1405
}
1406
1407
/* Set effective and real user ID to 0. Return errno. */
1408
error_t raise_privileges_permanently(void){
1409
error_t old_errno = errno;
1410
error_t ret_errno = raise_privileges();
1411
if(ret_errno != 0){
1412
errno = old_errno;
1413
return ret_errno;
1414
}
1415
if(setuid(0) == -1){
1416
ret_errno = errno;
1417
perror_plus("seteuid");
1418
}
1419
errno = old_errno;
1420
return ret_errno;
1421
}
1422
1423
/* Set effective user ID to unprivileged saved user ID */
1424
error_t lower_privileges(void){
1425
error_t old_errno = errno;
1426
error_t ret_errno = 0;
1427
if(seteuid(uid) == -1){
1428
ret_errno = errno;
1429
perror_plus("seteuid");
1430
}
1431
errno = old_errno;
1432
return ret_errno;
1433
}
1434
1435
bool run_network_hooks(const char *mode, const char *interface,
2079
1436
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);
1437
struct dirent **direntries;
1438
struct dirent *direntry;
1439
int ret;
1440
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1441
alphasort);
2103
1442
if(numhooks == -1){
2104
1443
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){
1444
} else {
1445
int devnull = open("/dev/null", O_RDONLY);
1446
for(int i = 0; i < numhooks; i++){
1447
direntry = direntries[i];
1448
char *fullname = NULL;
1449
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1450
if(ret < 0){
2162
1451
perror_plus("asprintf");
2163
_exit(EX_OSERR);
2164
}
2165
ret = setenv("DELAY", delaystring, 1);
2166
if(ret == -1){
1452
continue;
1453
}
1454
if(debug){
1455
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1456
direntry->d_name);
1457
}
1458
pid_t hook_pid = fork();
1459
if(hook_pid == 0){
1460
/* Child */
1461
/* Raise privileges */
1462
raise_privileges_permanently();
1463
/* Set group */
1464
errno = 0;
1465
ret = setgid(0);
1466
if(ret == -1){
1467
perror_plus("setgid");
1468
}
1469
/* Reset supplementary groups */
1470
errno = 0;
1471
ret = setgroups(0, NULL);
1472
if(ret == -1){
1473
perror_plus("setgroups");
1474
}
1475
dup2(devnull, STDIN_FILENO);
1476
close(devnull);
1477
dup2(STDERR_FILENO, STDOUT_FILENO);
1478
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1479
if(ret == -1){
1480
perror_plus("setenv");
1481
_exit(EX_OSERR);
1482
}
1483
ret = setenv("DEVICE", interface, 1);
1484
if(ret == -1){
1485
perror_plus("setenv");
1486
_exit(EX_OSERR);
1487
}
1488
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("MODE", mode, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
char *delaystring;
1499
ret = asprintf(&delaystring, "%f", delay);
1500
if(ret == -1){
1501
perror_plus("asprintf");
1502
_exit(EX_OSERR);
1503
}
1504
ret = setenv("DELAY", delaystring, 1);
1505
if(ret == -1){
1506
free(delaystring);
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
2167
1510
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;
1511
if(connect_to != NULL){
1512
ret = setenv("CONNECT", connect_to, 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
}
1518
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1519
perror_plus("execl");
1520
_exit(EXIT_FAILURE);
1521
}
2236
1522
} 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);
1523
int status;
1524
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1525
perror_plus("waitpid");
1526
free(fullname);
1527
continue;
1528
}
1529
if(WIFEXITED(status)){
1530
if(WEXITSTATUS(status) != 0){
1531
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1532
" with status %d\n", direntry->d_name,
1533
WEXITSTATUS(status));
1534
free(fullname);
1535
continue;
1536
}
1537
} else if(WIFSIGNALED(status)){
1538
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1539
" signal %d\n", direntry->d_name,
1540
WTERMSIG(status));
1541
free(fullname);
1542
continue;
1543
} else {
1544
fprintf_plus(stderr, "Warning: network hook \"%s\""
1545
" crashed\n", direntry->d_name);
1546
free(fullname);
1547
continue;
1548
}
1549
}
1550
free(fullname);
1551
if(debug){
1552
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1553
direntry->d_name);
1554
}
1555
}
1556
close(devnull);
1557
}
1558
return true;
2256
1559
}
2257
1560
2258
__attribute__((nonnull, warn_unused_result))
2259
1561
int bring_up_interface(const char *const interface,
2260
1562
const float delay){
1563
int sd = -1;
2261
1564
int old_errno = errno;
1565
int ret_errno = 0;
2262
1566
int ret;
2263
1567
struct ifreq network;
2264
unsigned int if_index = if_nametoindex(interface);
1568
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
2265
1569
if(if_index == 0){
2266
1570
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2267
1571
errno = old_errno;
2273
1577
return EINTR;
2274
1578
}
2275
1579
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);
1580
/* Re-raise priviliges */
1581
raise_privileges();
1582
1583
#ifdef __linux__
1584
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1585
messages about the network interface to mess up the prompt */
1586
ret = klogctl(8, NULL, 5);
1587
bool restore_loglevel = true;
1588
if(ret == -1){
1589
restore_loglevel = false;
1590
perror_plus("klogctl");
1591
}
1592
#endif /* __linux__ */
1593
1594
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
if(sd < 0){
1596
ret_errno = errno;
1597
perror_plus("socket");
1598
#ifdef __linux__
1599
if(restore_loglevel){
1600
ret = klogctl(7, NULL, 0);
1601
if(ret == -1){
1602
perror_plus("klogctl");
1603
}
1604
}
1605
#endif /* __linux__ */
1606
/* Lower privileges */
1607
lower_privileges();
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
strcpy(network.ifr_name, interface);
1612
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1613
if(ret == -1){
1614
ret_errno = errno;
1615
perror_plus("ioctl SIOCGIFFLAGS");
1616
#ifdef __linux__
1617
if(restore_loglevel){
1618
ret = klogctl(7, NULL, 0);
1619
if(ret == -1){
1620
perror_plus("klogctl");
1621
}
1622
}
1623
#endif /* __linux__ */
1624
/* Lower privileges */
1625
lower_privileges();
1626
errno = old_errno;
1627
return ret_errno;
1628
}
1629
if((network.ifr_flags & IFF_UP) == 0){
1630
network.ifr_flags |= IFF_UP;
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2354
1632
if(ret == -1){
2355
perror_plus("close");
2356
}
2357
2358
if(ret_setflags == -1){
2359
errno = ioctl_errno;
1633
ret_errno = errno;
2360
1634
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1635
#ifdef __linux__
1636
if(restore_loglevel){
1637
ret = klogctl(7, NULL, 0);
1638
if(ret == -1){
1639
perror_plus("klogctl");
1640
}
1641
}
1642
#endif /* __linux__ */
1643
/* Lower privileges */
1644
lower_privileges();
2361
1645
errno = old_errno;
2362
return ioctl_errno;
1646
return ret_errno;
2363
1647
}
2364
} else if(debug){
2365
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2366
interface);
2367
1648
}
2368
2369
1649
/* Sleep checking until interface is running.
2370
1650
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)){
1651
for(int i=0; i < delay * 4; i++){
1652
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1653
if(ret == -1){
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
} else if(network.ifr_flags & IFF_RUNNING){
2373
1656
break;
2374
1657
}
2375
1658
struct timespec sleeptime = { .tv_nsec = 250000000 };
2378
1661
perror_plus("nanosleep");
2379
1662
}
2380
1663
}
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;
1664
/* Close the socket */
1665
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
if(ret == -1){
1667
perror_plus("close");
2395
1668
}
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);
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
2443
1673
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);
1674
perror_plus("klogctl");
1675
}
2456
1676
}
2457
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
lower_privileges();
2458
1680
errno = old_errno;
2459
1681
return 0;
2460
1682
}
2461
1683
2462
1684
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
1685
AvahiSServiceBrowser *sb = NULL;
2477
error_t ret_errno;
1686
int error;
2478
1687
int ret;
2479
1688
intmax_t tmpmax;
2480
1689
char *tmp;
2481
1690
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;
1691
const char *interface = "";
1692
struct ifreq network;
1693
int sd = -1;
1694
bool take_down_interface = false;
1695
char tempdir[] = "/tmp/mandosXXXXXX";
1696
bool tempdir_created = false;
2487
1697
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
1698
const char *seckey = PATHDIR "/" SECKEY;
2489
1699
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
1700
2497
1701
bool gnutls_initialized = false;
2498
1702
bool gpgme_initialized = false;
2544
1748
{ .name = "pubkey", .key = 'p',
2545
1749
.arg = "FILE",
2546
1750
.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 },
1751
.group = 2 },
2564
1752
{ .name = "dh-bits", .key = 129,
2565
1753
.arg = "BITS",
2566
1754
.doc = "Bit length of the prime number used in the"
2567
1755
" Diffie-Hellman key exchange",
2568
1756
.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
1757
{ .name = "priority", .key = 130,
2575
1758
.arg = "STRING",
2576
1759
.doc = "GnuTLS priority string for the TLS handshake",
2610
1793
connect_to = arg;
2611
1794
break;
2612
1795
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
}
1796
interface = arg;
2618
1797
break;
2619
1798
case 's': /* --seckey */
2620
1799
seckey = arg;
2622
1801
case 'p': /* --pubkey */
2623
1802
pubkey = arg;
2624
1803
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
1804
case 129: /* --dh-bits */
2636
1805
errno = 0;
2637
1806
tmpmax = strtoimax(arg, &tmp, 10);
2641
1810
}
2642
1811
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2643
1812
break;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2646
break;
2647
1813
case 130: /* --priority */
2648
1814
mc.priority = arg;
2649
1815
break;
2672
1838
argp_state_help(state, state->out_stream,
2673
1839
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
1840
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
__builtin_unreachable();
2676
1841
case -3: /* --usage */
2677
1842
argp_state_help(state, state->out_stream,
2678
1843
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2679
__builtin_unreachable();
2680
1844
case 'V': /* --version */
2681
1845
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2682
1846
exit(argp_err_exit_status);
2691
1855
.args_doc = "",
2692
1856
.doc = "Mandos client -- Get and decrypt"
2693
1857
" 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){
1858
ret = argp_parse(&argp, argc, argv,
1859
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1860
switch(ret){
2697
1861
case 0:
2698
1862
break;
2699
1863
case ENOMEM:
2700
1864
default:
2701
errno = ret_errno;
1865
errno = ret;
2702
1866
perror_plus("argp_parse");
2703
1867
exitcode = EX_OSERR;
2704
1868
goto end;
2707
1871
goto end;
2708
1872
}
2709
1873
}
2710
1874
2711
1875
{
2712
1876
/* Work around Debian bug #633582:
2713
<https://bugs.debian.org/633582> */
1877
<http://bugs.debian.org/633582> */
2714
1878
2715
/* Re-raise privileges */
2716
ret = raise_privileges();
2717
if(ret != 0){
2718
errno = ret;
2719
perror_plus("Failed to raise privileges");
2720
} else {
1879
/* Re-raise priviliges */
1880
if(raise_privileges() == 0){
2721
1881
struct stat st;
2722
1882
2723
1883
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2737
1897
}
2738
1898
}
2739
1899
}
2740
close(seckey_fd);
1900
TEMP_FAILURE_RETRY(close(seckey_fd));
2741
1901
}
2742
1902
}
2743
1903
2744
1904
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2745
1905
int pubkey_fd = open(pubkey, O_RDONLY);
2746
1906
if(pubkey_fd == -1){
2758
1918
}
2759
1919
}
2760
1920
}
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
1921
TEMP_FAILURE_RETRY(close(pubkey_fd));
1922
}
1923
}
1924
2787
1925
/* 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;
1926
errno = 0;
1927
ret = seteuid(uid);
1928
if(ret == -1){
1929
perror_plus("seteuid");
2809
1930
}
2810
1931
}
2811
1932
}
2812
1933
2813
1934
/* Run network hooks */
2814
{
2815
if(mc.interfaces != NULL){
2816
interfaces_hooks = malloc(mc.interfaces_size);
2817
if(interfaces_hooks == NULL){
1935
if(not run_network_hooks("start", interface, delay)){
1936
goto end;
1937
}
1938
1939
if(not debug){
1940
avahi_set_log_function(empty_log);
1941
}
1942
1943
if(interface[0] == '\0'){
1944
struct dirent **direntries;
1945
/* First look for interfaces that are up */
1946
ret = scandir(sys_class_net, &direntries, up_interface,
1947
alphasort);
1948
if(ret == 0){
1949
/* No up interfaces, look for any good interfaces */
1950
free(direntries);
1951
ret = scandir(sys_class_net, &direntries, good_interface,
1952
alphasort);
1953
}
1954
if(ret >= 1){
1955
/* Pick the first interface returned */
1956
interface = strdup(direntries[0]->d_name);
1957
if(debug){
1958
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1959
}
1960
if(interface == NULL){
2818
1961
perror_plus("malloc");
1962
free(direntries);
1963
exitcode = EXIT_FAILURE;
2819
1964
goto end;
2820
1965
}
2821
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2822
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1966
free(direntries);
1967
} else {
1968
free(direntries);
1969
fprintf_plus(stderr, "Could not find a network interface\n");
1970
exitcode = EXIT_FAILURE;
1971
goto end;
2823
1972
}
2824
run_network_hooks("start", interfaces_hooks != NULL ?
2825
interfaces_hooks : "", delay);
2826
}
2827
2828
if(not debug){
2829
avahi_set_log_function(empty_log);
2830
1973
}
2831
1974
2832
1975
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2833
1976
from the signal handler */
2834
1977
/* Initialize the pseudo-RNG for Avahi */
2835
1978
srand((unsigned int) time(NULL));
2836
simple_poll = avahi_simple_poll_new();
2837
if(simple_poll == NULL){
1979
mc.simple_poll = avahi_simple_poll_new();
1980
if(mc.simple_poll == NULL){
2838
1981
fprintf_plus(stderr,
2839
1982
"Avahi: Failed to create simple poll object.\n");
2840
1983
exitcode = EX_UNAVAILABLE;
2904
2047
}
2905
2048
}
2906
2049
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;
2958
}
2959
}
2960
break;
2961
}
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);
2050
/* If the interface is down, bring it up */
2051
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2052
ret = bring_up_interface(interface, delay);
2053
if(ret != 0){
2054
errno = ret;
2055
perror_plus("Failed to bring up interface");
2056
}
2990
2057
}
2991
2058
2992
2059
if(quit_now){
2993
2060
goto end;
2994
2061
}
2995
2062
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
2063
ret = init_gnutls_global(pubkey, seckey);
3003
2064
if(ret == -1){
3004
2065
fprintf_plus(stderr, "init_gnutls_global failed\n");
3005
2066
exitcode = EX_UNAVAILABLE;
3012
2073
goto end;
3013
2074
}
3014
2075
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){
2076
if(mkdtemp(tempdir) == NULL){
3025
2077
perror_plus("mkdtemp");
3026
2078
goto end;
3027
2079
}
2080
tempdir_created = true;
3028
2081
3029
2082
if(quit_now){
3030
2083
goto end;
3031
2084
}
3032
2085
3033
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2086
if(not init_gpgme(pubkey, seckey, tempdir)){
3034
2087
fprintf_plus(stderr, "init_gpgme failed\n");
3035
2088
exitcode = EX_UNAVAILABLE;
3036
2089
goto end;
3057
2110
goto end;
3058
2111
}
3059
2112
3060
in_port_t port;
2113
uint16_t port;
3061
2114
errno = 0;
3062
2115
tmpmax = strtoimax(address+1, &tmp, 10);
3063
2116
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3064
or tmpmax != (in_port_t)tmpmax){
2117
or tmpmax != (uint16_t)tmpmax){
3065
2118
fprintf_plus(stderr, "Bad port number\n");
3066
2119
exitcode = EX_USAGE;
3067
2120
goto end;
3068
2121
}
3069
2122
3070
2123
if(quit_now){
3071
2124
goto end;
3072
2125
}
3073
2126
3074
port = (in_port_t)tmpmax;
2127
port = (uint16_t)tmpmax;
3075
2128
*address = '\0';
3076
2129
/* Colon in address indicates IPv6 */
3077
2130
int af;
3093
2146
}
3094
2147
3095
2148
while(not quit_now){
3096
ret = start_mandos_communication(address, port, if_index, af,
3097
&mc);
2149
ret = start_mandos_communication(address, port, if_index, af);
3098
2150
if(quit_now or ret == 0){
3099
2151
break;
3100
2152
}
3102
2154
fprintf_plus(stderr, "Retrying in %d seconds\n",
3103
2155
(int)retry_interval);
3104
2156
}
3105
sleep((unsigned int)retry_interval);
2157
sleep((int)retry_interval);
3106
2158
}
3107
2159
3108
if(not quit_now){
2160
if (not quit_now){
3109
2161
exitcode = EXIT_SUCCESS;
3110
2162
}
3111
2163
3126
2178
config.publish_domain = 0;
3127
2179
3128
2180
/* Allocate a new server */
3129
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3130
&config, NULL, NULL, &ret);
2181
mc.server = avahi_server_new(avahi_simple_poll_get
2182
(mc.simple_poll), &config, NULL,
2183
NULL, &error);
3131
2184
3132
2185
/* Free the Avahi configuration data */
3133
2186
avahi_server_config_free(&config);
3136
2189
/* Check if creating the Avahi server object succeeded */
3137
2190
if(mc.server == NULL){
3138
2191
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3139
avahi_strerror(ret));
2192
avahi_strerror(error));
3140
2193
exitcode = EX_UNAVAILABLE;
3141
2194
goto end;
3142
2195
}
3148
2201
/* Create the Avahi service browser */
3149
2202
sb = avahi_s_service_browser_new(mc.server, if_index,
3150
2203
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3151
NULL, 0, browse_callback,
3152
(void *)&mc);
2204
NULL, 0, browse_callback, NULL);
3153
2205
if(sb == NULL){
3154
2206
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3155
2207
avahi_strerror(avahi_server_errno(mc.server)));
3166
2218
if(debug){
3167
2219
fprintf_plus(stderr, "Starting Avahi loop search\n");
3168
2220
}
3169
3170
ret = avahi_loop_with_timeout(simple_poll,
3171
(int)(retry_interval * 1000), &mc);
2221
2222
ret = avahi_loop_with_timeout(mc.simple_poll,
2223
(int)(retry_interval * 1000));
3172
2224
if(debug){
3173
2225
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3174
2226
(ret == 0) ? "successfully" : "with error");
3177
2229
end:
3178
2230
3179
2231
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
}
2232
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
2233
}
3188
2234
3189
2235
/* Cleanup things */
3190
free(mc.interfaces);
3191
3192
2236
if(sb != NULL)
3193
2237
avahi_s_service_browser_free(sb);
3194
2238
3195
2239
if(mc.server != NULL)
3196
2240
avahi_server_free(mc.server);
3197
2241
3198
if(simple_poll != NULL)
3199
avahi_simple_poll_free(simple_poll);
2242
if(mc.simple_poll != NULL)
2243
avahi_simple_poll_free(mc.simple_poll);
3200
2244
3201
2245
if(gnutls_initialized){
3202
2246
gnutls_certificate_free_credentials(mc.cred);
2247
gnutls_global_deinit();
3203
2248
gnutls_dh_params_deinit(mc.dh_params);
3204
2249
}
3205
2250
3213
2258
mc.current_server->prev->next = NULL;
3214
2259
while(mc.current_server != NULL){
3215
2260
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
2261
free(mc.current_server);
3225
2262
mc.current_server = next;
3226
2263
}
3227
2264
}
3228
2265
3229
/* Re-raise privileges */
2266
/* Run network hooks */
2267
run_network_hooks("stop", interface, delay);
2268
2269
/* Re-raise priviliges */
3230
2270
{
3231
ret = raise_privileges();
3232
if(ret != 0){
3233
errno = ret;
3234
perror_plus("Failed to raise privileges");
3235
} else {
3236
3237
/* Run network hooks */
3238
run_network_hooks("stop", interfaces_hooks != NULL ?
3239
interfaces_hooks : "", delay);
3240
3241
/* Take down the network interfaces which were brought up */
3242
{
3243
char *interface = NULL;
3244
while((interface = argz_next(interfaces_to_take_down,
3245
interfaces_to_take_down_size,
3246
interface))){
3247
ret = take_down_interface(interface);
3248
if(ret != 0){
3249
errno = ret;
3250
perror_plus("Failed to take down interface");
3251
}
3252
}
3253
if(debug and (interfaces_to_take_down == NULL)){
3254
fprintf_plus(stderr, "No interfaces needed to be taken"
3255
" down\n");
3256
}
3257
}
3258
}
2271
raise_privileges();
3259
2272
3260
ret = lower_privileges_permanently();
3261
if(ret != 0){
3262
errno = ret;
3263
perror_plus("Failed to lower privileges permanently");
2273
/* Take down the network interface */
2274
if(take_down_interface and geteuid() == 0){
2275
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2276
if(ret == -1){
2277
perror_plus("ioctl SIOCGIFFLAGS");
2278
} else if(network.ifr_flags & IFF_UP){
2279
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2280
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2281
if(ret == -1){
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
}
2284
}
2285
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2286
if(ret == -1){
2287
perror_plus("close");
2288
}
3264
2289
}
3265
2290
}
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){
2291
/* Lower privileges permanently */
2292
errno = 0;
2293
ret = setuid(uid);
2294
if(ret == -1){
2295
perror_plus("setuid");
2296
}
2297
2298
/* Removes the GPGME temp directory and all files inside */
2299
if(tempdir_created){
3272
2300
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){
2301
struct dirent *direntry = NULL;
2302
int numentries = scandir(tempdir, &direntries, notdotentries,
2303
alphasort);
2304
if (numentries > 0){
3286
2305
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);
2306
direntry = direntries[i];
2307
char *fullname = NULL;
2308
ret = asprintf(&fullname, "%s/%s", tempdir,
2309
direntry->d_name);
2310
if(ret < 0){
2311
perror_plus("asprintf");
2312
continue;
2313
}
2314
ret = remove(fullname);
2315
if(ret == -1){
2316
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2317
strerror(errno));
2318
}
2319
free(fullname);
2320
}
2321
}
2322
2323
/* need to clean even if 0 because man page doesn't specify */
2324
free(direntries);
2325
if (numentries == -1){
2326
perror_plus("scandir");
2327
}
2328
ret = rmdir(tempdir);
2329
if(ret == -1 and errno != ENOENT){
2330
perror_plus("rmdir");
2331
}
3327
2332
}
3328
2333
3329
2334
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0