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237.16.20
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2011-11-28 22:38:51 UTC
- mto: (237.15.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@recompile.se-20111128223851-1wt9rch9cuoypjpf
* network-hooks.d/bridge: Look for both /sbin/brctl and /usr/sbin/brctl.
- 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
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9
* "browse_callback", and parts of "main".
10
10
*
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11
* Everything else is
12
* Copyright © 2008-2020 Teddy Hogeborn
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* Copyright © 2008-2020 Björn Påhlsson
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*
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* This file is part of Mandos.
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*
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
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*
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
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#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
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#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() */
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68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
79
73
*/
80
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
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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
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#include <iso646.h> /* not, or, and */
86
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#include <argp.h> /* struct argp_option, error_t, struct
87
80
argp_state, struct argp,
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG() */
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#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
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argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
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EAI_SYSTEM, gai_strerror() */
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#ifdef __linux__
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#include <sys/klog.h> /* klogctl() */
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110
gnutls_*
124
111
init_gnutls_session(),
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GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
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113
#include <gnutls/openpgp.h>
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/* 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
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/* GPGME */
137
118
#include <gpgme.h> /* All GPGME types, constants and
145
126
#define PATHDIR "/conf/conf.d/mandos"
146
127
#define SECKEY "seckey.txt"
147
128
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
130
152
131
bool debug = false;
156
135
static const char sys_class_net[] = "/sys/class/net";
157
136
char *connect_to = NULL;
158
137
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
uid_t uid = 65534;
161
gid_t gid = 65534;
162
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/* Doubly linked list that need to be circularly linked when used */
164
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typedef struct server{
165
141
const char *ip;
166
in_port_t port;
142
uint16_t port;
167
143
AvahiIfIndex if_index;
168
144
int af;
169
145
struct timespec last_seen;
173
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/* Used for passing in values through the Avahi callback functions */
175
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typedef struct {
152
AvahiSimplePoll *simple_poll;
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153
AvahiServer *server;
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gnutls_certificate_credentials_t cred;
178
155
unsigned int dh_bits;
180
157
const char *priority;
181
158
gpgme_ctx_t ctx;
182
159
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
185
160
} mandos_context;
186
161
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/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
189
167
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sig_atomic_t quit_now = 0;
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169
int signal_received = 0;
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170
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/* Function to use when printing errors */
194
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void perror_plus(const char *print_text){
195
int e = errno;
196
173
fprintf(stderr, "Mandos plugin %s: ",
197
174
program_invocation_short_name);
198
errno = e;
199
175
perror(print_text);
200
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}
201
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__attribute__((format (gnu_printf, 2, 3), nonnull))
203
178
int fprintf_plus(FILE *stream, const char *format, ...){
204
179
va_list ap;
205
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va_start (ap, format);
206
181
207
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
183
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
185
}
211
186
212
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/*
214
189
* bytes. "buffer_capacity" is how much is currently allocated,
215
190
* "buffer_length" is how much is already used.
216
191
*/
217
__attribute__((nonnull, warn_unused_result))
218
192
size_t incbuffer(char **buffer, size_t buffer_length,
219
193
size_t buffer_capacity){
220
194
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;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
227
197
return 0;
228
198
}
229
*buffer = new_buf;
230
199
buffer_capacity += BUFFER_SIZE;
231
200
}
232
201
return buffer_capacity;
233
202
}
234
203
235
204
/* 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){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
239
207
int ret;
240
208
server *new_server = malloc(sizeof(server));
241
209
if(new_server == NULL){
242
210
perror_plus("malloc");
243
return false;
211
return -1;
244
212
}
245
213
*new_server = (server){ .ip = strdup(ip),
246
214
.port = port,
248
216
.af = af };
249
217
if(new_server->ip == NULL){
250
218
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
return false;
219
return -1;
267
220
}
268
221
/* Special case of first server */
269
if(*current_server == NULL){
222
if (mc.current_server == NULL){
270
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new_server->next = new_server;
271
224
new_server->prev = new_server;
272
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
273
227
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
277
230
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
279
}
280
return true;
281
}
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
333
239
}
334
240
335
241
/*
336
242
* Initialize GPGME.
337
243
*/
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){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
343
246
gpgme_error_t rc;
344
247
gpgme_engine_info_t engine_info;
345
248
249
346
250
/*
347
251
* Helper function to insert pub and seckey to the engine keyring.
348
252
*/
349
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
350
254
int ret;
351
255
int fd;
352
256
gpgme_data_t pgp_data;
357
261
return false;
358
262
}
359
263
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
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
401
}
402
ret = lower_privileges();
403
if(ret != 0){
404
errno = ret;
405
perror_plus("Failed to lower privileges");
406
}
407
} while(false);
408
409
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
410
265
if(rc != GPG_ERR_NO_ERROR){
411
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
413
268
return false;
414
269
}
415
270
416
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
417
272
if(rc != GPG_ERR_NO_ERROR){
418
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
419
274
gpgme_strsource(rc), gpgme_strerror(rc));
420
275
return false;
421
276
}
422
{
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
429
fprintf_plus(stderr,
430
"The total number of considered keys: %d\n",
431
import_result->considered);
432
fprintf_plus(stderr,
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
435
fprintf_plus(stderr,
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
450
fprintf_plus(stderr,
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
453
fprintf_plus(stderr,
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
456
fprintf_plus(stderr,
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
466
import_status->fpr);
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
471
}
472
fprintf_plus(stderr, "Key status:\n");
473
fprintf_plus(stderr,
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
477
fprintf_plus(stderr,
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
481
fprintf_plus(stderr,
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
485
fprintf_plus(stderr,
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
489
fprintf_plus(stderr,
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
493
}
494
return false;
495
}
496
}
497
277
498
ret = close(fd);
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
279
if(ret == -1){
500
280
perror_plus("close");
501
281
}
538
318
}
539
319
540
320
/* Create new GPGME "context" */
541
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
542
322
if(rc != GPG_ERR_NO_ERROR){
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
545
326
return false;
546
327
}
547
328
556
337
* Decrypt OpenPGP data.
557
338
* Returns -1 on error
558
339
*/
559
__attribute__((nonnull, warn_unused_result))
560
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
561
341
size_t crypto_size,
562
char **plaintext,
563
mandos_context *mc){
342
char **plaintext){
564
343
gpgme_data_t dh_crypto, dh_plain;
565
344
gpgme_error_t rc;
566
345
ssize_t ret;
583
362
/* Create new empty GPGME data buffer for the plaintext */
584
363
rc = gpgme_data_new(&dh_plain);
585
364
if(rc != GPG_ERR_NO_ERROR){
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
587
367
gpgme_strsource(rc), gpgme_strerror(rc));
588
368
gpgme_data_release(dh_crypto);
589
369
return -1;
591
371
592
372
/* Decrypt data from the cryptotext data buffer to the plaintext
593
373
data buffer */
594
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
595
375
if(rc != GPG_ERR_NO_ERROR){
596
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
597
377
gpgme_strsource(rc), gpgme_strerror(rc));
598
378
plaintext_length = -1;
599
379
if(debug){
600
380
gpgme_decrypt_result_t result;
601
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
602
382
if(result == NULL){
603
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
604
384
} else {
605
if(result->unsupported_algorithm != NULL) {
606
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
607
result->unsupported_algorithm);
608
}
609
fprintf_plus(stderr, "Wrong key usage: %s\n",
610
result->wrong_key_usage ? "Yes" : "No");
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
611
389
if(result->file_name != NULL){
612
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
613
391
}
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
392
gpgme_recipient_t recipient;
393
recipient = result->recipients;
394
while(recipient != NULL){
617
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
620
399
fprintf_plus(stderr, "Secret key available: %s\n",
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
402
recipient = recipient->next;
622
403
}
623
404
}
624
405
}
680
461
return plaintext_length;
681
462
}
682
463
683
__attribute__((warn_unused_result, const))
684
static const char *safe_string(const char *str){
685
if(str == NULL)
686
return "(unknown)";
687
return str;
688
}
689
690
__attribute__((warn_unused_result))
691
static const char *safer_gnutls_strerror(int value){
692
const char *ret = gnutls_strerror(value);
693
return safe_string(ret);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
return ret;
694
470
}
695
471
696
472
/* GnuTLS log function callback */
697
__attribute__((nonnull))
698
473
static void debuggnutls(__attribute__((unused)) int level,
699
474
const char* string){
700
475
fprintf_plus(stderr, "GnuTLS: %s", string);
701
476
}
702
477
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
704
478
static int init_gnutls_global(const char *pubkeyfilename,
705
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
mandos_context *mc){
479
const char *seckeyfilename){
708
480
int ret;
709
481
710
482
if(debug){
711
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
712
484
}
713
485
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
490
return -1;
491
}
492
714
493
if(debug){
715
494
/* "Use a log level over 10 to enable all debugging options."
716
495
* - GnuTLS manual
720
499
}
721
500
722
501
/* OpenPGP credentials */
723
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
724
503
if(ret != GNUTLS_E_SUCCESS){
725
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
505
safer_gnutls_strerror(ret));
506
gnutls_global_deinit();
727
507
return -1;
728
508
}
729
509
730
510
if(debug){
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
733
513
pubkeyfilename,
734
514
seckeyfilename);
735
515
}
736
516
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
741
NULL, /* pass */
742
/* key_usage */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
744
NULL, /* names */
745
0, /* names_length */
746
/* privkey_flags */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
750
517
ret = gnutls_certificate_set_openpgp_key_file
751
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
752
519
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
756
520
if(ret != GNUTLS_E_SUCCESS){
757
521
fprintf_plus(stderr,
758
"Error[%d] while reading the key pair ('%s',"
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
759
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
525
safer_gnutls_strerror(ret));
763
527
}
764
528
765
529
/* GnuTLS server initialization */
766
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
767
531
if(ret != GNUTLS_E_SUCCESS){
768
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
769
533
" initialization: %s\n",
770
534
safer_gnutls_strerror(ret));
771
535
goto globalfail;
772
536
}
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
776
do {
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
778
if(dhpfile == -1){
779
perror_plus("open");
780
dhparamsfilename = NULL;
781
break;
782
}
783
size_t params_capacity = 0;
784
while(true){
785
params_capacity = incbuffer((char **)¶ms.data,
786
(size_t)params.size,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
790
free(params.data);
791
params.data = NULL;
792
dhparamsfilename = NULL;
793
break;
794
}
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
797
BUFFER_SIZE);
798
/* EOF */
799
if(bytes_read == 0){
800
break;
801
}
802
/* check bytes_read for failure */
803
if(bytes_read < 0){
804
perror_plus("read");
805
free(params.data);
806
params.data = NULL;
807
dhparamsfilename = NULL;
808
break;
809
}
810
params.size += (unsigned int)bytes_read;
811
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
818
}
819
if(dhparamsfilename == NULL){
820
break;
821
}
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
829
}
830
free(params.data);
831
} while(false);
832
}
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
839
do {
840
int secfile = open(seckeyfilename, O_RDONLY);
841
if(secfile == -1){
842
perror_plus("open");
843
break;
844
}
845
size_t buffer_capacity = 0;
846
while(true){
847
buffer_capacity = incbuffer((char **)&buffer.data,
848
(size_t)buffer.size,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
852
free(buffer.data);
853
buffer.data = NULL;
854
break;
855
}
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
858
BUFFER_SIZE);
859
/* EOF */
860
if(bytes_read == 0){
861
break;
862
}
863
/* check bytes_read for failure */
864
if(bytes_read < 0){
865
perror_plus("read");
866
free(buffer.data);
867
buffer.data = NULL;
868
break;
869
}
870
buffer.size += (unsigned int)bytes_read;
871
}
872
close(secfile);
873
} while(false);
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
877
{
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
882
" structure: %s",
883
safer_gnutls_strerror(ret));
884
free(buffer.data);
885
buffer.data = NULL;
886
} else {
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
892
privkey = NULL;
893
}
894
free(buffer.data);
895
buffer.data = NULL;
896
if(privkey != NULL){
897
/* Use private key to suggest an appropriate
898
sec_param */
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
901
if(debug){
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)));
906
}
907
}
908
}
909
}
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
913
if(debug){
914
fprintf_plus(stderr, "Falling back to security parameter"
915
" \"%s\"\n",
916
safe_string(gnutls_sec_param_get_name
917
(sec_param)));
918
}
919
}
920
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
if(uret != 0){
923
mc->dh_bits = uret;
924
if(debug){
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
928
(sec_param)),
929
mc->dh_bits);
930
}
931
} else {
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)),
936
safer_gnutls_strerror(ret));
937
goto globalfail;
938
}
939
#endif
940
} else { /* dh_bits != 0 */
941
if(debug){
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
943
mc->dh_bits);
944
}
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
950
goto globalfail;
951
}
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
953
}
954
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
542
}
543
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
955
545
956
546
return 0;
957
547
958
548
globalfail:
959
549
960
gnutls_certificate_free_credentials(mc->cred);
961
gnutls_dh_params_deinit(mc->dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
962
553
return -1;
963
554
}
964
555
965
__attribute__((nonnull, warn_unused_result))
966
static int init_gnutls_session(gnutls_session_t *session,
967
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
968
557
int ret;
969
558
/* GnuTLS session creation */
970
559
do {
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
973
| GNUTLS_NO_TICKETS
974
#endif
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
977
#endif
978
));
560
ret = gnutls_init(session, GNUTLS_SERVER);
979
561
if(quit_now){
980
562
return -1;
981
563
}
989
571
{
990
572
const char *err;
991
573
do {
992
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
993
575
if(quit_now){
994
576
gnutls_deinit(*session);
995
577
return -1;
1006
588
1007
589
do {
1008
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1009
mc->cred);
591
mc.cred);
1010
592
if(quit_now){
1011
593
gnutls_deinit(*session);
1012
594
return -1;
1022
604
/* ignore client certificate if any. */
1023
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1024
606
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
1025
609
return 0;
1026
610
}
1027
611
1029
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1030
614
__attribute__((unused)) const char *txt){}
1031
615
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
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
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
1205
616
/* Called when a Mandos server is found */
1206
__attribute__((nonnull, warn_unused_result))
1207
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
1208
618
AvahiIfIndex if_index,
1209
int af, mandos_context *mc){
619
int af){
1210
620
int ret, tcp_sd = -1;
1211
621
ssize_t sret;
1212
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
1213
626
char *buffer = NULL;
1214
627
char *decrypted_buffer = NULL;
1215
628
size_t buffer_length = 0;
1218
631
int retval = -1;
1219
632
gnutls_session_t session;
1220
633
int pf; /* Protocol family */
1221
bool route_added = false;
1222
634
1223
635
errno = 0;
1224
636
1240
652
return -1;
1241
653
}
1242
654
1243
/* If the interface is specified and we have a list of interfaces */
1244
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1245
/* Check if the interface is one of the interfaces we are using */
1246
bool match = false;
1247
{
1248
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
1252
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
match = true;
1254
break;
1255
}
1256
}
1257
}
1258
if(not match){
1259
/* This interface does not match any in the list, so we don't
1260
connect to the server */
1261
if(debug){
1262
char interface[IF_NAMESIZE];
1263
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1264
perror_plus("if_indextoname");
1265
} else {
1266
fprintf_plus(stderr, "Skipping server on non-used interface"
1267
" \"%s\"\n",
1268
if_indextoname((unsigned int)if_index,
1269
interface));
1270
}
1271
}
1272
return -1;
1273
}
1274
}
1275
1276
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
1277
656
if(ret != 0){
1278
657
return -1;
1279
658
}
1280
659
1281
660
if(debug){
1282
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1283
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
1284
663
}
1285
664
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
666
if(tcp_sd < 0){
1288
667
int e = errno;
1289
668
perror_plus("socket");
1296
675
goto mandos_end;
1297
676
}
1298
677
678
memset(&to, 0, sizeof(to));
1299
679
if(af == AF_INET6){
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1303
682
} else { /* IPv4 */
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
1307
685
}
1308
686
if(ret < 0 ){
1309
687
int e = errno;
1318
696
goto mandos_end;
1319
697
}
1320
698
if(af == AF_INET6){
1321
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1322
if(IN6_IS_ADDR_LINKLOCAL
1323
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
1324
706
if(if_index == AVAHI_IF_UNSPEC){
1325
707
fprintf_plus(stderr, "An IPv6 link-local address is"
1326
708
" incomplete without a network interface\n");
1328
710
goto mandos_end;
1329
711
}
1330
712
/* Set the network interface number as scope */
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
714
}
1333
715
} else {
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
1335
719
}
1336
720
1337
721
if(quit_now){
1345
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1346
730
perror_plus("if_indextoname");
1347
731
} else {
1348
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1349
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1350
734
}
1351
735
} else {
1352
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1353
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1354
738
}
1355
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1356
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1357
if(af == AF_INET6){
1358
ret = getnameinfo((struct sockaddr *)&to,
1359
sizeof(struct sockaddr_in6),
1360
addrstr, sizeof(addrstr), NULL, 0,
1361
NI_NUMERICHOST);
1362
} else {
1363
ret = getnameinfo((struct sockaddr *)&to,
1364
sizeof(struct sockaddr_in),
1365
addrstr, sizeof(addrstr), NULL, 0,
1366
NI_NUMERICHOST);
1367
}
1368
if(ret == EAI_SYSTEM){
1369
perror_plus("getnameinfo");
1370
} else if(ret != 0) {
1371
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1372
} else if(strcmp(addrstr, ip) != 0){
1373
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1374
}
1375
}
1376
1377
if(quit_now){
1378
errno = EINTR;
1379
goto mandos_end;
1380
}
1381
1382
while(true){
1383
if(af == AF_INET6){
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1386
} else {
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1389
}
1390
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1397
&to)->sin6_addr)))
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1408
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1412
*/
1413
if(debug){
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1415
" direct route\n");
1416
}
1417
int e = errno;
1418
route_added = add_local_route(ip, if_index);
1419
if(route_added){
1420
continue;
1421
}
1422
errno = e;
1423
}
1424
if(errno != ECONNREFUSED or debug){
1425
int e = errno;
1426
perror_plus("connect");
1427
errno = e;
1428
}
1429
goto mandos_end;
1430
}
1431
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
break;
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
1437
780
}
1438
781
1439
782
const char *out = mandos_protocol_version;
1475
818
goto mandos_end;
1476
819
}
1477
820
1478
/* This casting via intptr_t is to eliminate warning about casting
1479
an int to a pointer type. This is exactly how the GnuTLS Guile
1480
function "set-session-transport-fd!" does it. */
1481
gnutls_transport_set_ptr(session,
1482
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1483
823
1484
824
if(quit_now){
1485
825
errno = EINTR;
1590
930
if(buffer_length > 0){
1591
931
ssize_t decrypted_buffer_size;
1592
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1593
&decrypted_buffer, mc);
933
&decrypted_buffer);
1594
934
if(decrypted_buffer_size >= 0){
1595
935
1596
clearerr(stdout);
1597
936
written = 0;
1598
937
while(written < (size_t) decrypted_buffer_size){
1599
938
if(quit_now){
1615
954
}
1616
955
written += (size_t)ret;
1617
956
}
1618
ret = fflush(stdout);
1619
if(ret != 0){
1620
int e = errno;
1621
if(debug){
1622
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1623
strerror(errno));
1624
}
1625
errno = e;
1626
goto mandos_end;
1627
}
1628
957
retval = 0;
1629
958
}
1630
959
}
1633
962
1634
963
mandos_end:
1635
964
{
1636
if(route_added){
1637
if(not delete_local_route(ip, if_index)){
1638
fprintf_plus(stderr, "Failed to delete local route to %s on"
1639
" interface %d", ip, if_index);
1640
}
1641
}
1642
965
int e = errno;
1643
966
free(decrypted_buffer);
1644
967
free(buffer);
1645
968
if(tcp_sd >= 0){
1646
ret = close(tcp_sd);
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1647
970
}
1648
971
if(ret == -1){
1649
972
if(e == 0){
1674
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1675
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1676
999
flags,
1677
void *mc){
1678
if(r == NULL){
1679
return;
1680
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1681
1002
1682
1003
/* Called whenever a service has been resolved successfully or
1683
1004
timed out */
1684
1005
1685
1006
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1687
1007
return;
1688
1008
}
1689
1009
1693
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1694
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1695
1015
domain,
1696
avahi_strerror(avahi_server_errno
1697
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1698
1017
break;
1699
1018
1700
1019
case AVAHI_RESOLVER_FOUND:
1706
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1707
1026
host_name, ip, (intmax_t)interface, port);
1708
1027
}
1709
int ret = start_mandos_communication(ip, (in_port_t)port,
1710
interface,
1711
avahi_proto_to_af(proto),
1712
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1713
1030
if(ret == 0){
1714
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1715
1032
} else {
1716
if(not add_server(ip, (in_port_t)port, interface,
1717
avahi_proto_to_af(proto),
1718
&((mandos_context*)mc)->current_server)){
1719
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1720
" list\n", name);
1721
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1722
1035
}
1723
1036
}
1724
1037
}
1734
1047
const char *domain,
1735
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1736
1049
flags,
1737
void *mc){
1738
if(b == NULL){
1739
return;
1740
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1741
1052
1742
1053
/* Called whenever a new services becomes available on the LAN or
1743
1054
is removed from the LAN */
1751
1062
case AVAHI_BROWSER_FAILURE:
1752
1063
1753
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1754
avahi_strerror(avahi_server_errno
1755
(((mandos_context*)mc)->server)));
1756
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1757
1067
return;
1758
1068
1759
1069
case AVAHI_BROWSER_NEW:
1762
1072
the callback function is called the Avahi server will free the
1763
1073
resolver for us. */
1764
1074
1765
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1766
interface, protocol, name, type,
1767
domain, protocol, 0,
1768
resolve_callback, mc) == NULL)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1769
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1770
1079
" %s\n", name,
1771
avahi_strerror(avahi_server_errno
1772
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1773
1081
break;
1774
1082
1775
1083
case AVAHI_BROWSER_REMOVE:
1794
1102
signal_received = sig;
1795
1103
int old_errno = errno;
1796
1104
/* set main loop to exit */
1797
if(simple_poll != NULL){
1798
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1799
1107
}
1800
1108
errno = old_errno;
1801
1109
}
1802
1110
1803
__attribute__((nonnull, warn_unused_result))
1804
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1805
1112
int ret;
1806
int old_errno;
1807
1113
1808
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1809
1115
if(s < 0){
1810
old_errno = errno;
1811
1116
perror_plus("socket");
1812
errno = old_errno;
1813
1117
return false;
1814
1118
}
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1119
strcpy(ifr->ifr_name, ifname);
1817
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1818
1121
if(ret == -1){
1819
1122
if(debug){
1820
old_errno = errno;
1821
1123
perror_plus("ioctl SIOCGIFFLAGS");
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1828
1124
}
1829
1125
return false;
1830
1126
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1836
1127
return true;
1837
1128
}
1838
1129
1839
__attribute__((nonnull, warn_unused_result))
1840
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1841
1131
1842
1132
/* Reject the loopback device */
1884
1174
* corresponds to an acceptable network device.
1885
1175
* (This function is passed to scandir(3) as a filter function.)
1886
1176
*/
1887
__attribute__((nonnull, warn_unused_result))
1888
1177
int good_interface(const struct dirent *if_entry){
1889
1178
if(if_entry->d_name[0] == '.'){
1890
1179
return 0;
1906
1195
}
1907
1196
1908
1197
/*
1909
* This function determines if a network interface is up.
1910
*/
1911
__attribute__((nonnull, warn_unused_result))
1912
bool interface_is_up(const char *interface){
1913
struct ifreq ifr;
1914
if(not get_flags(interface, &ifr)){
1915
if(debug){
1916
fprintf_plus(stderr, "Failed to get flags for interface "
1917
"\"%s\"\n", interface);
1918
}
1919
return false;
1920
}
1921
1922
return (bool)(ifr.ifr_flags & IFF_UP);
1923
}
1924
1925
/*
1926
* This function determines if a network interface is running
1927
*/
1928
__attribute__((nonnull, warn_unused_result))
1929
bool interface_is_running(const char *interface){
1930
struct ifreq ifr;
1931
if(not get_flags(interface, &ifr)){
1932
if(debug){
1933
fprintf_plus(stderr, "Failed to get flags for interface "
1934
"\"%s\"\n", interface);
1935
}
1936
return false;
1937
}
1938
1939
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1940
}
1941
1942
__attribute__((nonnull, pure, warn_unused_result))
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1943
1240
int notdotentries(const struct dirent *direntry){
1944
1241
/* Skip "." and ".." */
1945
1242
if(direntry->d_name[0] == '.'
1952
1249
}
1953
1250
1954
1251
/* Is this directory entry a runnable program? */
1955
__attribute__((nonnull, warn_unused_result))
1956
1252
int runnable_hook(const struct dirent *direntry){
1957
1253
int ret;
1958
1254
size_t sret;
1966
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1967
1263
"abcdefghijklmnopqrstuvwxyz"
1968
1264
"0123456789"
1969
"_.-");
1265
"_-");
1970
1266
if((direntry->d_name)[sret] != '\0'){
1971
1267
/* Contains non-allowed characters */
1972
1268
if(debug){
1976
1272
return 0;
1977
1273
}
1978
1274
1979
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1980
1283
if(ret == -1){
1981
1284
if(debug){
1982
1285
perror_plus("Could not stat hook");
2006
1309
return 1;
2007
1310
}
2008
1311
2009
__attribute__((nonnull, warn_unused_result))
2010
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2011
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2012
1313
int ret;
2013
1314
struct timespec now;
2014
1315
struct timespec waited_time;
2015
1316
intmax_t block_time;
2016
1317
2017
1318
while(true){
2018
if(mc->current_server == NULL){
2019
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
2020
1321
fprintf_plus(stderr, "Wait until first server is found."
2021
1322
" No timeout!\n");
2022
1323
}
2023
1324
ret = avahi_simple_poll_iterate(s, -1);
2024
1325
} else {
2025
if(debug){
1326
if (debug){
2026
1327
fprintf_plus(stderr, "Check current_server if we should run"
2027
1328
" it, or wait\n");
2028
1329
}
2035
1336
/* Calculating in ms how long time between now and server
2036
1337
who we visted longest time ago. Now - last seen. */
2037
1338
waited_time.tv_sec = (now.tv_sec
2038
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
2039
1340
waited_time.tv_nsec = (now.tv_nsec
2040
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
2041
1342
/* total time is 10s/10,000ms.
2042
1343
Converting to s from ms by dividing by 1,000,
2043
1344
and ns to ms by dividing by 1,000,000. */
2045
1346
- ((intmax_t)waited_time.tv_sec * 1000))
2046
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
2047
1348
2048
if(debug){
1349
if (debug){
2049
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2050
1351
block_time);
2051
1352
}
2052
1353
2053
1354
if(block_time <= 0){
2054
ret = start_mandos_communication(mc->current_server->ip,
2055
mc->current_server->port,
2056
mc->current_server->if_index,
2057
mc->current_server->af, mc);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
2058
1359
if(ret == 0){
2059
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
2060
1361
return 0;
2061
1362
}
2062
1363
ret = clock_gettime(CLOCK_MONOTONIC,
2063
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
2064
1365
if(ret == -1){
2065
1366
perror_plus("clock_gettime");
2066
1367
return -1;
2067
1368
}
2068
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
2069
1370
block_time = 0; /* Call avahi to find new Mandos
2070
1371
servers, but don't block */
2071
1372
}
2073
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
2074
1375
}
2075
1376
if(ret != 0){
2076
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
2077
1378
return (ret != 1) ? ret : 0;
2078
1379
}
2079
1380
}
2080
1381
}
2081
1382
}
2082
1383
2083
__attribute__((nonnull))
2084
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
2085
1385
const float delay){
2086
struct dirent **direntries = NULL;
2087
if(hookdir_fd == -1){
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2089
| O_CLOEXEC);
2090
if(hookdir_fd == -1){
2091
if(errno == ENOENT){
2092
if(debug){
2093
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2094
" found\n", hookdir);
2095
}
2096
} else {
2097
perror_plus("open");
2098
}
2099
return;
2100
}
2101
}
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2103
if(devnull == -1){
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2105
return;
2106
}
2107
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
runnable_hook, alphasort);
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
2109
1391
if(numhooks == -1){
2110
1392
perror_plus("scandir");
2111
close(devnull);
2112
return;
2113
}
2114
struct dirent *direntry;
2115
int ret;
2116
for(int i = 0; i < numhooks; i++){
2117
direntry = direntries[i];
2118
if(debug){
2119
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2120
direntry->d_name);
2121
}
2122
pid_t hook_pid = fork();
2123
if(hook_pid == 0){
2124
/* Child */
2125
/* Raise privileges */
2126
errno = raise_privileges_permanently();
2127
if(errno != 0){
2128
perror_plus("Failed to raise privileges");
2129
_exit(EX_NOPERM);
2130
}
2131
/* Set group */
2132
errno = 0;
2133
ret = setgid(0);
2134
if(ret == -1){
2135
perror_plus("setgid");
2136
_exit(EX_NOPERM);
2137
}
2138
/* Reset supplementary groups */
2139
errno = 0;
2140
ret = setgroups(0, NULL);
2141
if(ret == -1){
2142
perror_plus("setgroups");
2143
_exit(EX_NOPERM);
2144
}
2145
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2146
if(ret == -1){
2147
perror_plus("setenv");
2148
_exit(EX_OSERR);
2149
}
2150
ret = setenv("DEVICE", interface, 1);
2151
if(ret == -1){
2152
perror_plus("setenv");
2153
_exit(EX_OSERR);
2154
}
2155
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2156
if(ret == -1){
2157
perror_plus("setenv");
2158
_exit(EX_OSERR);
2159
}
2160
ret = setenv("MODE", mode, 1);
2161
if(ret == -1){
2162
perror_plus("setenv");
2163
_exit(EX_OSERR);
2164
}
2165
char *delaystring;
2166
ret = asprintf(&delaystring, "%f", (double)delay);
2167
if(ret == -1){
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
2168
1400
perror_plus("asprintf");
2169
_exit(EX_OSERR);
2170
}
2171
ret = setenv("DELAY", delaystring, 1);
2172
if(ret == -1){
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
2173
1469
free(delaystring);
2174
perror_plus("setenv");
2175
_exit(EX_OSERR);
2176
}
2177
free(delaystring);
2178
if(connect_to != NULL){
2179
ret = setenv("CONNECT", connect_to, 1);
2180
if(ret == -1){
2181
perror_plus("setenv");
2182
_exit(EX_OSERR);
2183
}
2184
}
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2186
direntry->d_name,
2187
O_RDONLY));
2188
if(hook_fd == -1){
2189
perror_plus("openat");
2190
_exit(EXIT_FAILURE);
2191
}
2192
if(close(hookdir_fd) == -1){
2193
perror_plus("close");
2194
_exit(EXIT_FAILURE);
2195
}
2196
ret = dup2(devnull, STDIN_FILENO);
2197
if(ret == -1){
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
_exit(EX_OSERR);
2200
}
2201
ret = close(devnull);
2202
if(ret == -1){
2203
perror_plus("close");
2204
_exit(EX_OSERR);
2205
}
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2207
if(ret == -1){
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2209
_exit(EX_OSERR);
2210
}
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2212
environ) == -1){
2213
perror_plus("fexecve");
2214
_exit(EXIT_FAILURE);
2215
}
2216
} else {
2217
if(hook_pid == -1){
2218
perror_plus("fork");
2219
free(direntry);
2220
continue;
2221
}
2222
int status;
2223
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2224
perror_plus("waitpid");
2225
free(direntry);
2226
continue;
2227
}
2228
if(WIFEXITED(status)){
2229
if(WEXITSTATUS(status) != 0){
2230
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2231
" with status %d\n", direntry->d_name,
2232
WEXITSTATUS(status));
2233
free(direntry);
2234
continue;
2235
}
2236
} else if(WIFSIGNALED(status)){
2237
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2238
" signal %d\n", direntry->d_name,
2239
WTERMSIG(status));
2240
free(direntry);
2241
continue;
2242
} else {
2243
fprintf_plus(stderr, "Warning: network hook \"%s\""
2244
" crashed\n", direntry->d_name);
2245
free(direntry);
2246
continue;
2247
}
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2251
direntry->d_name);
2252
}
2253
free(direntry);
2254
}
2255
free(direntries);
2256
if(close(hookdir_fd) == -1){
2257
perror_plus("close");
2258
} else {
2259
hookdir_fd = -1;
2260
}
2261
close(devnull);
2262
}
2263
2264
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
2268
int ret;
2269
struct ifreq network;
2270
unsigned int if_index = if_nametoindex(interface);
2271
if(if_index == 0){
2272
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2273
errno = old_errno;
2274
return ENXIO;
2275
}
2276
2277
if(quit_now){
2278
errno = old_errno;
2279
return EINTR;
2280
}
2281
2282
if(not interface_is_up(interface)){
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
2285
if(not get_flags(interface, &network)){
2286
ret_errno = errno;
2287
fprintf_plus(stderr, "Failed to get flags for interface "
2288
"\"%s\"\n", interface);
2289
errno = old_errno;
2290
return ret_errno;
2291
}
2292
network.ifr_flags |= IFF_UP; /* set flag */
2293
2294
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2295
if(sd == -1){
2296
ret_errno = errno;
2297
perror_plus("socket");
2298
errno = old_errno;
2299
return ret_errno;
2300
}
2301
2302
if(quit_now){
2303
ret = close(sd);
2304
if(ret == -1){
2305
perror_plus("close");
2306
}
2307
errno = old_errno;
2308
return EINTR;
2309
}
2310
2311
if(debug){
2312
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2313
interface);
2314
}
2315
2316
/* Raise privileges */
2317
ret_errno = raise_privileges();
2318
if(ret_errno != 0){
2319
errno = ret_errno;
2320
perror_plus("Failed to raise privileges");
2321
}
2322
2323
#ifdef __linux__
2324
int ret_linux;
2325
bool restore_loglevel = false;
2326
if(ret_errno == 0){
2327
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2328
messages about the network interface to mess up the prompt */
2329
ret_linux = klogctl(8, NULL, 5);
2330
if(ret_linux == -1){
2331
perror_plus("klogctl");
2332
} else {
2333
restore_loglevel = true;
2334
}
2335
}
2336
#endif /* __linux__ */
2337
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2338
ioctl_errno = errno;
2339
#ifdef __linux__
2340
if(restore_loglevel){
2341
ret_linux = klogctl(7, NULL, 0);
2342
if(ret_linux == -1){
2343
perror_plus("klogctl");
2344
}
2345
}
2346
#endif /* __linux__ */
2347
2348
/* If raise_privileges() succeeded above */
2349
if(ret_errno == 0){
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2352
if(ret_errno != 0){
2353
errno = ret_errno;
2354
perror_plus("Failed to lower privileges");
2355
}
2356
}
2357
2358
/* Close the socket */
2359
ret = close(sd);
2360
if(ret == -1){
2361
perror_plus("close");
2362
}
2363
2364
if(ret_setflags == -1){
2365
errno = ioctl_errno;
2366
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2367
errno = old_errno;
2368
return ioctl_errno;
2369
}
2370
} else if(debug){
2371
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2372
interface);
2373
}
2374
2375
/* Sleep checking until interface is running.
2376
Check every 0.25s, up to total time of delay */
2377
for(int i = 0; i < delay * 4; i++){
2378
if(interface_is_running(interface)){
2379
break;
2380
}
2381
struct timespec sleeptime = { .tv_nsec = 250000000 };
2382
ret = nanosleep(&sleeptime, NULL);
2383
if(ret == -1 and errno != EINTR){
2384
perror_plus("nanosleep");
2385
}
2386
}
2387
2388
errno = old_errno;
2389
return 0;
2390
}
2391
2392
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
2395
struct ifreq network;
2396
unsigned int if_index = if_nametoindex(interface);
2397
if(if_index == 0){
2398
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2399
errno = old_errno;
2400
return ENXIO;
2401
}
2402
if(interface_is_up(interface)){
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
2405
if(not get_flags(interface, &network) and debug){
2406
ret_errno = errno;
2407
fprintf_plus(stderr, "Failed to get flags for interface "
2408
"\"%s\"\n", interface);
2409
errno = old_errno;
2410
return ret_errno;
2411
}
2412
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2413
2414
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2415
if(sd == -1){
2416
ret_errno = errno;
2417
perror_plus("socket");
2418
errno = old_errno;
2419
return ret_errno;
2420
}
2421
2422
if(debug){
2423
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2424
interface);
2425
}
2426
2427
/* Raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
}
2433
2434
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2435
ioctl_errno = errno;
2436
2437
/* If raise_privileges() succeeded above */
2438
if(ret_errno == 0){
2439
/* Lower privileges */
2440
ret_errno = lower_privileges();
2441
if(ret_errno != 0){
2442
errno = ret_errno;
2443
perror_plus("Failed to lower privileges");
2444
}
2445
}
2446
2447
/* Close the socket */
2448
int ret = close(sd);
2449
if(ret == -1){
2450
perror_plus("close");
2451
}
2452
2453
if(ret_setflags == -1){
2454
errno = ioctl_errno;
2455
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2456
errno = old_errno;
2457
return ioctl_errno;
2458
}
2459
} else if(debug){
2460
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2461
interface);
2462
}
2463
2464
errno = old_errno;
2465
return 0;
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
2466
1509
}
2467
1510
2468
1511
int main(int argc, char *argv[]){
2469
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2473
":%PROFILE_ULTRA",
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
#else
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
#endif
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
2482
1512
AvahiSServiceBrowser *sb = NULL;
2483
error_t ret_errno;
1513
int error;
2484
1514
int ret;
2485
1515
intmax_t tmpmax;
2486
1516
char *tmp;
2487
1517
int exitcode = EXIT_SUCCESS;
2488
char *interfaces_to_take_down = NULL;
2489
size_t interfaces_to_take_down_size = 0;
2490
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2491
char old_tempdir[] = "/tmp/mandosXXXXXX";
2492
char *tempdir = NULL;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
2493
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
1527
const char *seckey = PATHDIR "/" SECKEY;
2495
1528
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2499
#endif
2500
const char *dh_params_file = NULL;
2501
char *interfaces_hooks = NULL;
2502
1529
2503
1530
bool gnutls_initialized = false;
2504
1531
bool gpgme_initialized = false;
2550
1577
{ .name = "pubkey", .key = 'p',
2551
1578
.arg = "FILE",
2552
1579
.doc = "OpenPGP public key file base name",
2553
.group = 1 },
2554
{ .name = "tls-privkey", .key = 't',
2555
.arg = "FILE",
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2558
#else
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2560
#endif
2561
.group = 1 },
2562
{ .name = "tls-pubkey", .key = 'T',
2563
.arg = "FILE",
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2566
#else
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2568
#endif
2569
.group = 1 },
1580
.group = 2 },
2570
1581
{ .name = "dh-bits", .key = 129,
2571
1582
.arg = "BITS",
2572
1583
.doc = "Bit length of the prime number used in the"
2573
1584
" Diffie-Hellman key exchange",
2574
1585
.group = 2 },
2575
{ .name = "dh-params", .key = 134,
2576
.arg = "FILE",
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2579
.group = 2 },
2580
1586
{ .name = "priority", .key = 130,
2581
1587
.arg = "STRING",
2582
1588
.doc = "GnuTLS priority string for the TLS handshake",
2587
1593
.group = 2 },
2588
1594
{ .name = "retry", .key = 132,
2589
1595
.arg = "SECONDS",
2590
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
2591
1597
.group = 2 },
2592
1598
{ .name = "network-hook-dir", .key = 133,
2593
1599
.arg = "DIR",
2616
1622
connect_to = arg;
2617
1623
break;
2618
1624
case 'i': /* --interface */
2619
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2620
arg, (int)',');
2621
if(ret_errno != 0){
2622
argp_error(state, "%s", strerror(ret_errno));
2623
}
1625
interface = arg;
2624
1626
break;
2625
1627
case 's': /* --seckey */
2626
1628
seckey = arg;
2628
1630
case 'p': /* --pubkey */
2629
1631
pubkey = arg;
2630
1632
break;
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2633
tls_privkey = arg;
2634
#endif
2635
break;
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2638
tls_pubkey = arg;
2639
#endif
2640
break;
2641
1633
case 129: /* --dh-bits */
2642
1634
errno = 0;
2643
1635
tmpmax = strtoimax(arg, &tmp, 10);
2647
1639
}
2648
1640
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2649
1641
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
2653
1642
case 130: /* --priority */
2654
1643
mc.priority = arg;
2655
1644
break;
2678
1667
argp_state_help(state, state->out_stream,
2679
1668
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
1669
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
1670
case -3: /* --usage */
2683
1671
argp_state_help(state, state->out_stream,
2684
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
2687
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
1677
exit(argp_err_exit_status);
2689
1678
break;
2697
1686
.args_doc = "",
2698
1687
.doc = "Mandos client -- Get and decrypt"
2699
1688
" passwords from a Mandos server" };
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
1689
ret = argp_parse(&argp, argc, argv,
1690
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1691
switch(ret){
2703
1692
case 0:
2704
1693
break;
2705
1694
case ENOMEM:
2706
1695
default:
2707
errno = ret_errno;
1696
errno = ret;
2708
1697
perror_plus("argp_parse");
2709
1698
exitcode = EX_OSERR;
2710
1699
goto end;
2713
1702
goto end;
2714
1703
}
2715
1704
}
2716
1705
2717
1706
{
2718
1707
/* Work around Debian bug #633582:
2719
<https://bugs.debian.org/633582> */
1708
<http://bugs.debian.org/633582> */
2720
1709
2721
/* Re-raise privileges */
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2725
perror_plus("Failed to raise privileges");
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2726
1715
} else {
2727
1716
struct stat st;
2728
1717
2743
1732
}
2744
1733
}
2745
1734
}
2746
close(seckey_fd);
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
2747
1736
}
2748
1737
}
2749
1738
2750
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2751
1740
int pubkey_fd = open(pubkey, O_RDONLY);
2752
1741
if(pubkey_fd == -1){
2764
1753
}
2765
1754
}
2766
1755
}
2767
close(pubkey_fd);
2768
}
2769
}
2770
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2776
} else {
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2778
if(ret == -1){
2779
perror_plus("fstat");
2780
} else {
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2784
if(ret == -1){
2785
perror_plus("fchown");
2786
}
2787
}
2788
}
2789
close(dhparams_fd);
2790
}
2791
}
2792
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
2793
1760
/* Lower privileges */
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2797
perror_plus("Failed to lower privileges");
2798
}
2799
}
2800
}
2801
2802
/* Remove invalid interface names (except "none") */
2803
{
2804
char *interface = NULL;
2805
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2806
interface))){
2807
if(strcmp(interface, "none") != 0
2808
and if_nametoindex(interface) == 0){
2809
if(interface[0] != '\0'){
2810
fprintf_plus(stderr, "Not using nonexisting interface"
2811
" \"%s\"\n", interface);
2812
}
2813
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2814
interface = NULL;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2815
1765
}
2816
1766
}
2817
1767
}
2818
1768
2819
1769
/* Run network hooks */
2820
{
2821
if(mc.interfaces != NULL){
2822
interfaces_hooks = malloc(mc.interfaces_size);
2823
if(interfaces_hooks == NULL){
2824
perror_plus("malloc");
2825
goto end;
2826
}
2827
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2828
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2829
}
2830
run_network_hooks("start", interfaces_hooks != NULL ?
2831
interfaces_hooks : "", delay);
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2832
1772
}
2833
1773
2834
1774
if(not debug){
2835
1775
avahi_set_log_function(empty_log);
2836
1776
}
2837
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
2838
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2839
1811
from the signal handler */
2840
1812
/* Initialize the pseudo-RNG for Avahi */
2841
1813
srand((unsigned int) time(NULL));
2842
simple_poll = avahi_simple_poll_new();
2843
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2844
1816
fprintf_plus(stderr,
2845
1817
"Avahi: Failed to create simple poll object.\n");
2846
1818
exitcode = EX_UNAVAILABLE;
2910
1882
}
2911
1883
}
2912
1884
2913
/* If no interfaces were specified, make a list */
2914
if(mc.interfaces == NULL){
2915
struct dirent **direntries = NULL;
2916
/* Look for any good interfaces */
2917
ret = scandir(sys_class_net, &direntries, good_interface,
2918
alphasort);
2919
if(ret >= 1){
2920
/* Add all found interfaces to interfaces list */
2921
for(int i = 0; i < ret; ++i){
2922
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2923
direntries[i]->d_name);
2924
if(ret_errno != 0){
2925
errno = ret_errno;
2926
perror_plus("argz_add");
2927
free(direntries[i]);
2928
continue;
2929
}
2930
if(debug){
2931
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2932
direntries[i]->d_name);
2933
}
2934
free(direntries[i]);
2935
}
2936
free(direntries);
2937
} else {
2938
if(ret == 0){
2939
free(direntries);
2940
}
2941
fprintf_plus(stderr, "Could not find a network interface\n");
2942
exitcode = EXIT_FAILURE;
2943
goto end;
2944
}
2945
}
2946
2947
/* Bring up interfaces which are down, and remove any "none"s */
2948
{
2949
char *interface = NULL;
2950
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2951
interface))){
2952
/* If interface name is "none", stop bringing up interfaces.
2953
Also remove all instances of "none" from the list */
2954
if(strcmp(interface, "none") == 0){
2955
argz_delete(&mc.interfaces, &mc.interfaces_size,
2956
interface);
2957
interface = NULL;
2958
while((interface = argz_next(mc.interfaces,
2959
mc.interfaces_size, interface))){
2960
if(strcmp(interface, "none") == 0){
2961
argz_delete(&mc.interfaces, &mc.interfaces_size,
2962
interface);
2963
interface = NULL;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2964
1970
}
2965
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2966
1989
break;
2967
1990
}
2968
bool interface_was_up = interface_is_up(interface);
2969
errno = bring_up_interface(interface, delay);
2970
if(not interface_was_up){
2971
if(errno != 0){
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2974
} else {
2975
errno = argz_add(&interfaces_to_take_down,
2976
&interfaces_to_take_down_size,
2977
interface);
2978
if(errno != 0){
2979
perror_plus("argz_add");
2980
}
2981
}
2982
}
2983
}
2984
if(debug and (interfaces_to_take_down == NULL)){
2985
fprintf_plus(stderr, "No interfaces were brought up\n");
2986
}
2987
}
2988
2989
/* If we only got one interface, explicitly use only that one */
2990
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2991
if(debug){
2992
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2993
mc.interfaces);
2994
}
2995
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2996
2020
}
2997
2021
2998
2022
if(quit_now){
2999
2023
goto end;
3000
2024
}
3001
2025
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3006
#else
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3008
#endif
2026
ret = init_gnutls_global(pubkey, seckey);
3009
2027
if(ret == -1){
3010
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
3011
2029
exitcode = EX_UNAVAILABLE;
3018
2036
goto end;
3019
2037
}
3020
2038
3021
/* Try /run/tmp before /tmp */
3022
tempdir = mkdtemp(run_tempdir);
3023
if(tempdir == NULL and errno == ENOENT){
3024
if(debug){
3025
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3026
run_tempdir, old_tempdir);
3027
}
3028
tempdir = mkdtemp(old_tempdir);
3029
}
3030
if(tempdir == NULL){
2039
if(mkdtemp(tempdir) == NULL){
3031
2040
perror_plus("mkdtemp");
3032
2041
goto end;
3033
2042
}
2043
tempdir_created = true;
3034
2044
3035
2045
if(quit_now){
3036
2046
goto end;
3037
2047
}
3038
2048
3039
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
3040
2050
fprintf_plus(stderr, "init_gpgme failed\n");
3041
2051
exitcode = EX_UNAVAILABLE;
3042
2052
goto end;
3052
2062
/* Connect directly, do not use Zeroconf */
3053
2063
/* (Mainly meant for debugging) */
3054
2064
char *address = strrchr(connect_to, ':');
3055
3056
2065
if(address == NULL){
3057
2066
fprintf_plus(stderr, "No colon in address\n");
3058
2067
exitcode = EX_USAGE;
3063
2072
goto end;
3064
2073
}
3065
2074
3066
in_port_t port;
2075
uint16_t port;
3067
2076
errno = 0;
3068
2077
tmpmax = strtoimax(address+1, &tmp, 10);
3069
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3070
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
3071
2080
fprintf_plus(stderr, "Bad port number\n");
3072
2081
exitcode = EX_USAGE;
3073
2082
goto end;
3074
2083
}
3075
2084
3076
2085
if(quit_now){
3077
2086
goto end;
3078
2087
}
3079
2088
3080
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
3081
2090
*address = '\0';
3082
2091
/* Colon in address indicates IPv6 */
3083
2092
int af;
3099
2108
}
3100
2109
3101
2110
while(not quit_now){
3102
ret = start_mandos_communication(address, port, if_index, af,
3103
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
3104
2112
if(quit_now or ret == 0){
3105
2113
break;
3106
2114
}
3108
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
3109
2117
(int)retry_interval);
3110
2118
}
3111
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
3112
2120
}
3113
2121
3114
if(not quit_now){
2122
if (not quit_now){
3115
2123
exitcode = EXIT_SUCCESS;
3116
2124
}
3117
2125
3132
2140
config.publish_domain = 0;
3133
2141
3134
2142
/* Allocate a new server */
3135
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3136
&config, NULL, NULL, &ret);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
3137
2146
3138
2147
/* Free the Avahi configuration data */
3139
2148
avahi_server_config_free(&config);
3142
2151
/* Check if creating the Avahi server object succeeded */
3143
2152
if(mc.server == NULL){
3144
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3145
avahi_strerror(ret));
2154
avahi_strerror(error));
3146
2155
exitcode = EX_UNAVAILABLE;
3147
2156
goto end;
3148
2157
}
3154
2163
/* Create the Avahi service browser */
3155
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
3156
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3157
NULL, 0, browse_callback,
3158
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
3159
2167
if(sb == NULL){
3160
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3161
2169
avahi_strerror(avahi_server_errno(mc.server)));
3172
2180
if(debug){
3173
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
3174
2182
}
3175
3176
ret = avahi_loop_with_timeout(simple_poll,
3177
(int)(retry_interval * 1000), &mc);
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
3178
2186
if(debug){
3179
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3180
2188
(ret == 0) ? "successfully" : "with error");
3183
2191
end:
3184
2192
3185
2193
if(debug){
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3190
} else {
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3192
}
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
2195
}
3194
2196
3195
2197
/* Cleanup things */
3196
free(mc.interfaces);
3197
3198
2198
if(sb != NULL)
3199
2199
avahi_s_service_browser_free(sb);
3200
2200
3201
2201
if(mc.server != NULL)
3202
2202
avahi_server_free(mc.server);
3203
2203
3204
if(simple_poll != NULL)
3205
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
3206
2206
3207
2207
if(gnutls_initialized){
3208
2208
gnutls_certificate_free_credentials(mc.cred);
2209
gnutls_global_deinit();
3209
2210
gnutls_dh_params_deinit(mc.dh_params);
3210
2211
}
3211
2212
3219
2220
mc.current_server->prev->next = NULL;
3220
2221
while(mc.current_server != NULL){
3221
2222
server *next = mc.current_server->next;
3222
#ifdef __GNUC__
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3225
#endif
3226
free((char *)(mc.current_server->ip));
3227
#ifdef __GNUC__
3228
#pragma GCC diagnostic pop
3229
#endif
3230
2223
free(mc.current_server);
3231
2224
mc.current_server = next;
3232
2225
}
3233
2226
}
3234
2227
3235
/* Re-raise privileges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
3236
2232
{
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
3240
perror_plus("Failed to raise privileges");
3241
} else {
3242
3243
/* Run network hooks */
3244
run_network_hooks("stop", interfaces_hooks != NULL ?
3245
interfaces_hooks : "", delay);
3246
3247
/* Take down the network interfaces which were brought up */
3248
{
3249
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3252
interface))){
3253
ret = take_down_interface(interface);
3254
if(ret != 0){
3255
errno = ret;
3256
perror_plus("Failed to take down interface");
3257
}
3258
}
3259
if(debug and (interfaces_to_take_down == NULL)){
3260
fprintf_plus(stderr, "No interfaces needed to be taken"
3261
" down\n");
3262
}
3263
}
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
3264
2237
}
3265
2238
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
3269
perror_plus("Failed to lower privileges permanently");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
3270
2255
}
3271
2256
}
3272
3273
free(interfaces_to_take_down);
3274
free(interfaces_hooks);
3275
3276
void clean_dir_at(int base, const char * const dirname,
3277
uintmax_t level){
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2263
2264
/* Removes the GPGME temp directory and all files inside */
2265
if(tempdir_created){
3278
2266
struct dirent **direntries = NULL;
3279
int dret;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3281
O_RDONLY
3282
| O_NOFOLLOW
3283
| O_DIRECTORY
3284
| O_PATH));
3285
if(dir_fd == -1){
3286
perror_plus("open");
3287
return;
3288
}
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
3292
2271
for(int i = 0; i < numentries; i++){
3293
if(debug){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3296
}
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3298
if(dret == -1){
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3301
AT_REMOVEDIR);
3302
}
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3308
dret = 0;
3309
}
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3313
}
3314
}
3315
free(direntries[i]);
3316
}
3317
3318
/* need to clean even if 0 because man page doesn't specify */
3319
free(direntries);
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3323
}
3324
} else {
3325
perror_plus("scandirat");
3326
}
3327
close(dir_fd);
3328
}
3329
3330
/* Removes the GPGME temp directory and all files inside */
3331
if(tempdir != NULL){
3332
clean_dir_at(-1, tempdir, 0);
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
direntry->d_name);
2276
if(ret < 0){
2277
perror_plus("asprintf");
2278
continue;
2279
}
2280
ret = remove(fullname);
2281
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2284
}
2285
free(fullname);
2286
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
2293
}
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2297
}
3333
2298
}
3334
2299
3335
2300
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0