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- Committer: Teddy Hogeborn
- Date: 2009-09-17 01:21:27 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917012127-4kwzquwuvudwucuv
* debian/control (Standards-Version): Updated to "2.8.3".
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
* mandos-client.conf.xml (OPTIONS/timeout): Add that a successful
client request will also
reset the timeout.
* mandos.xml (CHECKING): - '' -
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2020 Teddy Hogeborn
13
* Copyright © 2008-2020 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
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,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
68
SIOCSIFFLAGS, if_indextoname(),
76
69
if_nametoindex(), IF_NAMESIZE */
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat(), lstat(), symlink() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
90
82
#include <signal.h> /* sigemptyset(), sigaddset(),
91
83
sigaction(), SIGTERM, sig_atomic_t,
92
84
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
85
105
86
#ifdef __linux__
106
87
#include <sys/klog.h> /* klogctl() */
123
104
gnutls_*
124
105
init_gnutls_session(),
125
106
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
107
#include <gnutls/openpgp.h>
128
/* gnutls_certificate_set_openpgp_key_file(),
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
135
110
136
111
/* GPGME */
137
112
#include <gpgme.h> /* All GPGME types, constants and
145
120
#define PATHDIR "/conf/conf.d/mandos"
146
121
#define SECKEY "seckey.txt"
147
122
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
123
152
124
bool debug = false;
153
125
static const char mandos_protocol_version[] = "1";
154
126
const char *argp_program_version = "mandos-client " VERSION;
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
156
static const char sys_class_net[] = "/sys/class/net";
157
char *connect_to = NULL;
158
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
uid_t uid = 65534;
161
gid_t gid = 65534;
162
163
/* Doubly linked list that need to be circularly linked when used */
164
typedef struct server{
165
const char *ip;
166
in_port_t port;
167
AvahiIfIndex if_index;
168
int af;
169
struct timespec last_seen;
170
struct server *next;
171
struct server *prev;
172
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
173
128
174
129
/* Used for passing in values through the Avahi callback functions */
175
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
176
132
AvahiServer *server;
177
133
gnutls_certificate_credentials_t cred;
178
134
unsigned int dh_bits;
179
135
gnutls_dh_params_t dh_params;
180
136
const char *priority;
181
137
gpgme_ctx_t ctx;
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
185
138
} mandos_context;
186
139
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
189
190
sig_atomic_t quit_now = 0;
191
int signal_received = 0;
192
193
/* Function to use when printing errors */
194
void perror_plus(const char *print_text){
195
int e = errno;
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
198
errno = e;
199
perror(print_text);
200
}
201
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
203
int fprintf_plus(FILE *stream, const char *format, ...){
204
va_list ap;
205
va_start (ap, format);
206
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
211
144
212
145
/*
213
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
214
147
* bytes. "buffer_capacity" is how much is currently allocated,
215
148
* "buffer_length" is how much is already used.
216
149
*/
217
__attribute__((nonnull, warn_unused_result))
218
150
size_t incbuffer(char **buffer, size_t buffer_length,
219
size_t buffer_capacity){
151
size_t buffer_capacity){
220
152
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;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
227
155
return 0;
228
156
}
229
*buffer = new_buf;
230
157
buffer_capacity += BUFFER_SIZE;
231
158
}
232
159
return buffer_capacity;
233
160
}
234
161
235
/* 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){
239
int ret;
240
server *new_server = malloc(sizeof(server));
241
if(new_server == NULL){
242
perror_plus("malloc");
243
return false;
244
}
245
*new_server = (server){ .ip = strdup(ip),
246
.port = port,
247
.if_index = if_index,
248
.af = af };
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
266
return false;
267
}
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
273
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
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;
333
}
334
335
162
/*
336
163
* Initialize GPGME.
337
164
*/
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){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
343
167
gpgme_error_t rc;
344
168
gpgme_engine_info_t engine_info;
345
169
170
346
171
/*
347
172
* Helper function to insert pub and seckey to the engine keyring.
348
173
*/
349
bool import_key(const char * const filename){
174
bool import_key(const char *filename){
350
175
int ret;
351
176
int fd;
352
177
gpgme_data_t pgp_data;
353
178
354
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
355
180
if(fd == -1){
356
perror_plus("open");
181
perror("open");
357
182
return false;
358
183
}
359
184
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
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
410
186
if(rc != GPG_ERR_NO_ERROR){
411
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
413
189
return false;
414
190
}
415
191
416
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
417
193
if(rc != GPG_ERR_NO_ERROR){
418
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
419
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
420
196
return false;
421
197
}
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
198
498
ret = close(fd);
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
499
200
if(ret == -1){
500
perror_plus("close");
201
perror("close");
501
202
}
502
203
gpgme_data_release(pgp_data);
503
204
return true;
504
205
}
505
206
506
207
if(debug){
507
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
508
209
}
509
210
510
211
/* Init GPGME */
511
212
gpgme_check_version(NULL);
512
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
513
214
if(rc != GPG_ERR_NO_ERROR){
514
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
515
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
516
217
return false;
517
218
}
518
219
519
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
520
221
rc = gpgme_get_engine_info(&engine_info);
521
222
if(rc != GPG_ERR_NO_ERROR){
522
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
523
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
524
225
return false;
525
226
}
526
227
while(engine_info != NULL){
532
233
engine_info = engine_info->next;
533
234
}
534
235
if(engine_info == NULL){
535
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
536
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
537
237
return false;
538
238
}
539
239
540
240
/* Create new GPGME "context" */
541
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
542
242
if(rc != GPG_ERR_NO_ERROR){
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
545
245
return false;
546
246
}
547
247
556
256
* Decrypt OpenPGP data.
557
257
* Returns -1 on error
558
258
*/
559
__attribute__((nonnull, warn_unused_result))
560
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
561
260
size_t crypto_size,
562
char **plaintext,
563
mandos_context *mc){
261
char **plaintext){
564
262
gpgme_data_t dh_crypto, dh_plain;
565
263
gpgme_error_t rc;
566
264
ssize_t ret;
568
266
ssize_t plaintext_length = 0;
569
267
570
268
if(debug){
571
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
572
270
}
573
271
574
272
/* Create new GPGME data buffer from memory cryptotext */
575
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
576
274
0);
577
275
if(rc != GPG_ERR_NO_ERROR){
578
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
579
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
580
278
return -1;
581
279
}
582
280
583
281
/* Create new empty GPGME data buffer for the plaintext */
584
282
rc = gpgme_data_new(&dh_plain);
585
283
if(rc != GPG_ERR_NO_ERROR){
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
587
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
588
286
gpgme_data_release(dh_crypto);
589
287
return -1;
590
288
}
591
289
592
290
/* Decrypt data from the cryptotext data buffer to the plaintext
593
291
data buffer */
594
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
595
293
if(rc != GPG_ERR_NO_ERROR){
596
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
597
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
598
296
plaintext_length = -1;
599
297
if(debug){
600
298
gpgme_decrypt_result_t result;
601
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
602
300
if(result == NULL){
603
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
604
302
} 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");
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
611
307
if(result->file_name != NULL){
612
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
613
309
}
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
617
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);
620
fprintf_plus(stderr, "Secret key available: %s\n",
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
622
320
}
623
321
}
624
322
}
626
324
}
627
325
628
326
if(debug){
629
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
630
328
}
631
329
632
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
633
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
634
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
635
333
plaintext_length = -1;
636
334
goto decrypt_end;
637
335
}
639
337
*plaintext = NULL;
640
338
while(true){
641
339
plaintext_capacity = incbuffer(plaintext,
642
(size_t)plaintext_length,
643
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
644
342
if(plaintext_capacity == 0){
645
perror_plus("incbuffer");
646
plaintext_length = -1;
647
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
648
346
}
649
347
650
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
655
353
break;
656
354
}
657
355
if(ret < 0){
658
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
659
357
plaintext_length = -1;
660
358
goto decrypt_end;
661
359
}
663
361
}
664
362
665
363
if(debug){
666
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
667
365
for(ssize_t i = 0; i < plaintext_length; i++){
668
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
669
367
}
680
378
return plaintext_length;
681
379
}
682
380
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);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
385
ret = "(unknown)";
386
return ret;
694
387
}
695
388
696
389
/* GnuTLS log function callback */
697
__attribute__((nonnull))
698
390
static void debuggnutls(__attribute__((unused)) int level,
699
391
const char* string){
700
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
701
393
}
702
394
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
704
395
static int init_gnutls_global(const char *pubkeyfilename,
705
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
mandos_context *mc){
396
const char *seckeyfilename){
708
397
int ret;
709
398
710
399
if(debug){
711
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
401
}
402
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
407
return -1;
712
408
}
713
409
714
410
if(debug){
720
416
}
721
417
722
418
/* OpenPGP credentials */
723
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
724
420
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
727
427
return -1;
728
428
}
729
429
730
430
if(debug){
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
733
pubkeyfilename,
734
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
735
434
}
736
435
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
436
ret = gnutls_certificate_set_openpgp_key_file
751
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
752
438
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
756
439
if(ret != GNUTLS_E_SUCCESS){
757
fprintf_plus(stderr,
758
"Error[%d] while reading the key pair ('%s',"
759
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
762
445
goto globalfail;
763
446
}
764
447
765
448
/* GnuTLS server initialization */
766
ret = gnutls_dh_params_init(&mc->dh_params);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
769
" initialization: %s\n",
770
safer_gnutls_strerror(ret));
771
goto globalfail;
772
}
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
}
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
955
463
956
464
return 0;
957
465
958
466
globalfail:
959
467
960
gnutls_certificate_free_credentials(mc->cred);
961
gnutls_dh_params_deinit(mc->dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
962
471
return -1;
963
472
}
964
473
965
__attribute__((nonnull, warn_unused_result))
966
static int init_gnutls_session(gnutls_session_t *session,
967
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
968
475
int ret;
969
476
/* GnuTLS session creation */
970
477
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
));
979
if(quit_now){
980
return -1;
981
}
478
ret = gnutls_init(session, GNUTLS_SERVER);
982
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
983
480
if(ret != GNUTLS_E_SUCCESS){
984
fprintf_plus(stderr,
985
"Error in GnuTLS session initialization: %s\n",
986
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
987
483
}
988
484
989
485
{
990
486
const char *err;
991
487
do {
992
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
993
if(quit_now){
994
gnutls_deinit(*session);
995
return -1;
996
}
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
997
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
998
490
if(ret != GNUTLS_E_SUCCESS){
999
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1000
fprintf_plus(stderr, "GnuTLS error: %s\n",
1001
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
1002
494
gnutls_deinit(*session);
1003
495
return -1;
1004
496
}
1006
498
1007
499
do {
1008
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1009
mc->cred);
1010
if(quit_now){
1011
gnutls_deinit(*session);
1012
return -1;
1013
}
501
mc.cred);
1014
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
1015
503
if(ret != GNUTLS_E_SUCCESS){
1016
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1017
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
1018
506
gnutls_deinit(*session);
1019
507
return -1;
1020
508
}
1022
510
/* ignore client certificate if any. */
1023
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1024
512
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
514
1025
515
return 0;
1026
516
}
1027
517
1029
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1030
520
__attribute__((unused)) const char *txt){}
1031
521
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
}
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
1204
524
1205
525
/* 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,
526
static int start_mandos_communication(const char *ip, uint16_t port,
1208
527
AvahiIfIndex if_index,
1209
int af, mandos_context *mc){
528
int af){
1210
529
int ret, tcp_sd = -1;
1211
530
ssize_t sret;
1212
struct sockaddr_storage to;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
1213
535
char *buffer = NULL;
1214
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
1215
537
size_t buffer_length = 0;
1216
538
size_t buffer_capacity = 0;
1217
539
size_t written;
1218
int retval = -1;
540
int retval = 0;
1219
541
gnutls_session_t session;
1220
542
int pf; /* Protocol family */
1221
bool route_added = false;
1222
1223
errno = 0;
1224
543
1225
544
if(quit_now){
1226
errno = EINTR;
1227
545
return -1;
1228
546
}
1229
547
1235
553
pf = PF_INET;
1236
554
break;
1237
555
default:
1238
fprintf_plus(stderr, "Bad address family: %d\n", af);
1239
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
1240
557
return -1;
1241
558
}
1242
559
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);
560
ret = init_gnutls_session(&session);
1277
561
if(ret != 0){
1278
562
return -1;
1279
563
}
1280
564
1281
565
if(debug){
1282
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1283
PRIuMAX "\n", ip, (uintmax_t)port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
1284
568
}
1285
569
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
1287
571
if(tcp_sd < 0){
1288
int e = errno;
1289
perror_plus("socket");
1290
errno = e;
572
perror("socket");
573
retval = -1;
1291
574
goto mandos_end;
1292
575
}
1293
576
1294
577
if(quit_now){
1295
errno = EINTR;
1296
578
goto mandos_end;
1297
579
}
1298
580
581
memset(&to, 0, sizeof(to));
1299
582
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);
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1303
585
} 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);
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
1307
588
}
1308
589
if(ret < 0 ){
1309
int e = errno;
1310
perror_plus("inet_pton");
1311
errno = e;
590
perror("inet_pton");
591
retval = -1;
1312
592
goto mandos_end;
1313
593
}
1314
594
if(ret == 0){
1315
int e = errno;
1316
fprintf_plus(stderr, "Bad address: %s\n", ip);
1317
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
1318
597
goto mandos_end;
1319
598
}
1320
599
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)){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
1324
607
if(if_index == AVAHI_IF_UNSPEC){
1325
fprintf_plus(stderr, "An IPv6 link-local address is"
1326
" incomplete without a network interface\n");
1327
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
1328
611
goto mandos_end;
1329
612
}
1330
613
/* Set the network interface number as scope */
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
614
to.in6.sin6_scope_id = (uint32_t)if_index;
1332
615
}
1333
616
} else {
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
1335
620
}
1336
621
1337
622
if(quit_now){
1338
errno = EINTR;
1339
623
goto mandos_end;
1340
624
}
1341
625
1343
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1344
628
char interface[IF_NAMESIZE];
1345
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1346
perror_plus("if_indextoname");
630
perror("if_indextoname");
1347
631
} else {
1348
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1349
"\n", ip, interface, (uintmax_t)port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
1350
634
}
1351
635
} else {
1352
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1353
ip, (uintmax_t)port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
1354
638
}
1355
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1356
640
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;
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
650
perror("inet_ntop");
651
} else {
652
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
654
}
655
}
656
}
657
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
667
if(ret < 0){
668
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
1437
675
}
1438
676
1439
677
const char *out = mandos_protocol_version;
1441
679
while(true){
1442
680
size_t out_size = strlen(out);
1443
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1444
out_size - written));
682
out_size - written));
1445
683
if(ret == -1){
1446
int e = errno;
1447
perror_plus("write");
1448
errno = e;
684
perror("write");
685
retval = -1;
1449
686
goto mandos_end;
1450
687
}
1451
688
written += (size_t)ret;
1461
698
}
1462
699
1463
700
if(quit_now){
1464
errno = EINTR;
1465
701
goto mandos_end;
1466
702
}
1467
703
}
1468
704
1469
705
if(debug){
1470
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1471
707
}
1472
708
1473
709
if(quit_now){
1474
errno = EINTR;
1475
710
goto mandos_end;
1476
711
}
1477
712
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);
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1483
714
1484
715
if(quit_now){
1485
errno = EINTR;
1486
716
goto mandos_end;
1487
717
}
1488
718
1489
719
do {
1490
720
ret = gnutls_handshake(session);
1491
721
if(quit_now){
1492
errno = EINTR;
1493
722
goto mandos_end;
1494
723
}
1495
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1496
725
1497
726
if(ret != GNUTLS_E_SUCCESS){
1498
727
if(debug){
1499
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1500
729
gnutls_perror(ret);
1501
730
}
1502
errno = EPROTO;
731
retval = -1;
1503
732
goto mandos_end;
1504
733
}
1505
734
1506
735
/* Read OpenPGP packet that contains the wanted password */
1507
736
1508
737
if(debug){
1509
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1510
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
1511
740
}
1512
741
1513
742
while(true){
1514
743
1515
744
if(quit_now){
1516
errno = EINTR;
1517
745
goto mandos_end;
1518
746
}
1519
747
1520
748
buffer_capacity = incbuffer(&buffer, buffer_length,
1521
buffer_capacity);
749
buffer_capacity);
1522
750
if(buffer_capacity == 0){
1523
int e = errno;
1524
perror_plus("incbuffer");
1525
errno = e;
751
perror("incbuffer");
752
retval = -1;
1526
753
goto mandos_end;
1527
754
}
1528
755
1529
756
if(quit_now){
1530
errno = EINTR;
1531
757
goto mandos_end;
1532
758
}
1533
759
1546
772
ret = gnutls_handshake(session);
1547
773
1548
774
if(quit_now){
1549
errno = EINTR;
1550
775
goto mandos_end;
1551
776
}
1552
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1553
778
if(ret < 0){
1554
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1555
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1556
780
gnutls_perror(ret);
1557
errno = EPROTO;
781
retval = -1;
1558
782
goto mandos_end;
1559
783
}
1560
784
break;
1561
785
default:
1562
fprintf_plus(stderr, "Unknown error while reading data from"
1563
" encrypted session with Mandos server\n");
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
1564
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1565
errno = EIO;
1566
790
goto mandos_end;
1567
791
}
1568
792
} else {
1571
795
}
1572
796
1573
797
if(debug){
1574
fprintf_plus(stderr, "Closing TLS session\n");
1575
}
1576
1577
if(quit_now){
1578
errno = EINTR;
1579
goto mandos_end;
1580
}
1581
1582
do {
1583
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1584
if(quit_now){
1585
errno = EINTR;
1586
goto mandos_end;
1587
}
1588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
1589
810
1590
811
if(buffer_length > 0){
1591
812
ssize_t decrypted_buffer_size;
1592
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1593
&decrypted_buffer, mc);
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
1594
816
if(decrypted_buffer_size >= 0){
1595
817
1596
clearerr(stdout);
1597
818
written = 0;
1598
819
while(written < (size_t) decrypted_buffer_size){
1599
820
if(quit_now){
1600
errno = EINTR;
1601
821
goto mandos_end;
1602
822
}
1603
823
1605
825
(size_t)decrypted_buffer_size - written,
1606
826
stdout);
1607
827
if(ret == 0 and ferror(stdout)){
1608
int e = errno;
1609
828
if(debug){
1610
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1611
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
1612
831
}
1613
errno = e;
1614
goto mandos_end;
832
retval = -1;
833
break;
1615
834
}
1616
835
written += (size_t)ret;
1617
836
}
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
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1629
840
}
841
} else {
842
retval = -1;
1630
843
}
1631
844
1632
845
/* Shutdown procedure */
1633
846
1634
847
mandos_end:
1635
{
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
int e = errno;
1643
free(decrypted_buffer);
1644
free(buffer);
1645
if(tcp_sd >= 0){
1646
ret = close(tcp_sd);
1647
}
1648
if(ret == -1){
1649
if(e == 0){
1650
e = errno;
1651
}
1652
perror_plus("close");
1653
}
1654
gnutls_deinit(session);
1655
errno = e;
1656
if(quit_now){
1657
errno = EINTR;
1658
retval = -1;
1659
}
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1660
858
}
1661
859
return retval;
1662
860
}
1674
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
1675
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1676
874
flags,
1677
void *mc){
1678
if(r == NULL){
1679
return;
1680
}
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1681
877
1682
878
/* Called whenever a service has been resolved successfully or
1683
879
timed out */
1684
880
1685
881
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1687
882
return;
1688
883
}
1689
884
1690
885
switch(event){
1691
886
default:
1692
887
case AVAHI_RESOLVER_FAILURE:
1693
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1694
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1695
domain,
1696
avahi_strerror(avahi_server_errno
1697
(((mandos_context*)mc)->server)));
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1698
891
break;
1699
892
1700
893
case AVAHI_RESOLVER_FOUND:
1702
895
char ip[AVAHI_ADDRESS_STR_MAX];
1703
896
avahi_address_snprint(ip, sizeof(ip), address);
1704
897
if(debug){
1705
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1706
PRIdMAX ") on port %" PRIu16 "\n", name,
1707
host_name, ip, (intmax_t)interface, port);
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1708
901
}
1709
int ret = start_mandos_communication(ip, (in_port_t)port,
1710
interface,
1711
avahi_proto_to_af(proto),
1712
mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1713
904
if(ret == 0){
1714
avahi_simple_poll_quit(simple_poll);
1715
} 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
}
905
avahi_simple_poll_quit(mc.simple_poll);
1722
906
}
1723
907
}
1724
908
}
1734
918
const char *domain,
1735
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1736
920
flags,
1737
void *mc){
1738
if(b == NULL){
1739
return;
1740
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1741
923
1742
924
/* Called whenever a new services becomes available on the LAN or
1743
925
is removed from the LAN */
1750
932
default:
1751
933
case AVAHI_BROWSER_FAILURE:
1752
934
1753
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);
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1757
938
return;
1758
939
1759
940
case AVAHI_BROWSER_NEW:
1762
943
the callback function is called the Avahi server will free the
1763
944
resolver for us. */
1764
945
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)
1769
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1770
" %s\n", name,
1771
avahi_strerror(avahi_server_errno
1772
(((mandos_context*)mc)->server)));
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1773
951
break;
1774
952
1775
953
case AVAHI_BROWSER_REMOVE:
1778
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1779
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1780
958
if(debug){
1781
fprintf_plus(stderr, "No Mandos server found, still"
1782
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1783
960
}
1784
961
break;
1785
962
}
1786
963
}
1787
964
1788
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1789
966
static void handle_sigterm(int sig){
1790
967
if(quit_now){
1791
968
return;
1793
970
quit_now = 1;
1794
971
signal_received = sig;
1795
972
int old_errno = errno;
1796
/* set main loop to exit */
1797
if(simple_poll != NULL){
1798
avahi_simple_poll_quit(simple_poll);
1799
}
1800
errno = old_errno;
1801
}
1802
1803
__attribute__((nonnull, warn_unused_result))
1804
bool get_flags(const char *ifname, struct ifreq *ifr){
1805
int ret;
1806
int old_errno;
1807
1808
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1809
if(s < 0){
1810
old_errno = errno;
1811
perror_plus("socket");
1812
errno = old_errno;
1813
return false;
1814
}
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1817
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1818
if(ret == -1){
1819
if(debug){
1820
old_errno = errno;
1821
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
}
1829
return false;
1830
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1836
return true;
1837
}
1838
1839
__attribute__((nonnull, warn_unused_result))
1840
bool good_flags(const char *ifname, const struct ifreq *ifr){
1841
1842
/* Reject the loopback device */
1843
if(ifr->ifr_flags & IFF_LOOPBACK){
1844
if(debug){
1845
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1846
ifname);
1847
}
1848
return false;
1849
}
1850
/* Accept point-to-point devices only if connect_to is specified */
1851
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1852
if(debug){
1853
fprintf_plus(stderr, "Accepting point-to-point interface"
1854
" \"%s\"\n", ifname);
1855
}
1856
return true;
1857
}
1858
/* Otherwise, reject non-broadcast-capable devices */
1859
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1860
if(debug){
1861
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1862
" \"%s\"\n", ifname);
1863
}
1864
return false;
1865
}
1866
/* Reject non-ARP interfaces (including dummy interfaces) */
1867
if(ifr->ifr_flags & IFF_NOARP){
1868
if(debug){
1869
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1870
ifname);
1871
}
1872
return false;
1873
}
1874
1875
/* Accept this device */
1876
if(debug){
1877
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1878
}
1879
return true;
1880
}
1881
1882
/*
1883
* This function determines if a directory entry in /sys/class/net
1884
* corresponds to an acceptable network device.
1885
* (This function is passed to scandir(3) as a filter function.)
1886
*/
1887
__attribute__((nonnull, warn_unused_result))
1888
int good_interface(const struct dirent *if_entry){
1889
if(if_entry->d_name[0] == '.'){
1890
return 0;
1891
}
1892
1893
struct ifreq ifr;
1894
if(not get_flags(if_entry->d_name, &ifr)){
1895
if(debug){
1896
fprintf_plus(stderr, "Failed to get flags for interface "
1897
"\"%s\"\n", if_entry->d_name);
1898
}
1899
return 0;
1900
}
1901
1902
if(not good_flags(if_entry->d_name, &ifr)){
1903
return 0;
1904
}
1905
return 1;
1906
}
1907
1908
/*
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))
1943
int notdotentries(const struct dirent *direntry){
1944
/* Skip "." and ".." */
1945
if(direntry->d_name[0] == '.'
1946
and (direntry->d_name[1] == '\0'
1947
or (direntry->d_name[1] == '.'
1948
and direntry->d_name[2] == '\0'))){
1949
return 0;
1950
}
1951
return 1;
1952
}
1953
1954
/* Is this directory entry a runnable program? */
1955
__attribute__((nonnull, warn_unused_result))
1956
int runnable_hook(const struct dirent *direntry){
1957
int ret;
1958
size_t sret;
1959
struct stat st;
1960
1961
if((direntry->d_name)[0] == '\0'){
1962
/* Empty name? */
1963
return 0;
1964
}
1965
1966
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1967
"abcdefghijklmnopqrstuvwxyz"
1968
"0123456789"
1969
"_.-");
1970
if((direntry->d_name)[sret] != '\0'){
1971
/* Contains non-allowed characters */
1972
if(debug){
1973
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1974
direntry->d_name);
1975
}
1976
return 0;
1977
}
1978
1979
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1980
if(ret == -1){
1981
if(debug){
1982
perror_plus("Could not stat hook");
1983
}
1984
return 0;
1985
}
1986
if(not (S_ISREG(st.st_mode))){
1987
/* Not a regular file */
1988
if(debug){
1989
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1990
direntry->d_name);
1991
}
1992
return 0;
1993
}
1994
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1995
/* Not executable */
1996
if(debug){
1997
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1998
direntry->d_name);
1999
}
2000
return 0;
2001
}
2002
if(debug){
2003
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2004
direntry->d_name);
2005
}
2006
return 1;
2007
}
2008
2009
__attribute__((nonnull, warn_unused_result))
2010
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2011
mandos_context *mc){
2012
int ret;
2013
struct timespec now;
2014
struct timespec waited_time;
2015
intmax_t block_time;
2016
2017
while(true){
2018
if(mc->current_server == NULL){
2019
if(debug){
2020
fprintf_plus(stderr, "Wait until first server is found."
2021
" No timeout!\n");
2022
}
2023
ret = avahi_simple_poll_iterate(s, -1);
2024
} else {
2025
if(debug){
2026
fprintf_plus(stderr, "Check current_server if we should run"
2027
" it, or wait\n");
2028
}
2029
/* the current time */
2030
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2031
if(ret == -1){
2032
perror_plus("clock_gettime");
2033
return -1;
2034
}
2035
/* Calculating in ms how long time between now and server
2036
who we visted longest time ago. Now - last seen. */
2037
waited_time.tv_sec = (now.tv_sec
2038
- mc->current_server->last_seen.tv_sec);
2039
waited_time.tv_nsec = (now.tv_nsec
2040
- mc->current_server->last_seen.tv_nsec);
2041
/* total time is 10s/10,000ms.
2042
Converting to s from ms by dividing by 1,000,
2043
and ns to ms by dividing by 1,000,000. */
2044
block_time = ((retry_interval
2045
- ((intmax_t)waited_time.tv_sec * 1000))
2046
- ((intmax_t)waited_time.tv_nsec / 1000000));
2047
2048
if(debug){
2049
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2050
block_time);
2051
}
2052
2053
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);
2058
if(ret == 0){
2059
avahi_simple_poll_quit(s);
2060
return 0;
2061
}
2062
ret = clock_gettime(CLOCK_MONOTONIC,
2063
&mc->current_server->last_seen);
2064
if(ret == -1){
2065
perror_plus("clock_gettime");
2066
return -1;
2067
}
2068
mc->current_server = mc->current_server->next;
2069
block_time = 0; /* Call avahi to find new Mandos
2070
servers, but don't block */
2071
}
2072
2073
ret = avahi_simple_poll_iterate(s, (int)block_time);
2074
}
2075
if(ret != 0){
2076
if(ret > 0 or errno != EINTR){
2077
return (ret != 1) ? ret : 0;
2078
}
2079
}
2080
}
2081
}
2082
2083
__attribute__((nonnull))
2084
void run_network_hooks(const char *mode, const char *interface,
2085
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);
2109
if(numhooks == -1){
2110
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){
2168
perror_plus("asprintf");
2169
_exit(EX_OSERR);
2170
}
2171
ret = setenv("DELAY", delaystring, 1);
2172
if(ret == -1){
2173
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;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
2466
977
}
2467
978
2468
979
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
980
AvahiSServiceBrowser *sb = NULL;
2483
error_t ret_errno;
981
int error;
2484
982
int ret;
2485
983
intmax_t tmpmax;
2486
984
char *tmp;
2487
985
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;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
2493
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
996
const char *seckey = PATHDIR "/" SECKEY;
2495
997
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
998
2503
999
bool gnutls_initialized = false;
2504
1000
bool gpgme_initialized = false;
2505
1001
float delay = 2.5f;
2506
double retry_interval = 10; /* 10s between trying a server and
2507
retrying the same server again */
2508
1002
2509
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2510
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2516
1010
errno = 0;
2517
1011
ret = setgid(gid);
2518
1012
if(ret == -1){
2519
perror_plus("setgid");
1013
perror("setgid");
2520
1014
}
2521
1015
2522
1016
/* Lower user privileges (temporarily) */
2523
1017
errno = 0;
2524
1018
ret = seteuid(uid);
2525
1019
if(ret == -1){
2526
perror_plus("seteuid");
1020
perror("seteuid");
2527
1021
}
2528
1022
2529
1023
if(quit_now){
2550
1044
{ .name = "pubkey", .key = 'p',
2551
1045
.arg = "FILE",
2552
1046
.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 },
1047
.group = 2 },
2570
1048
{ .name = "dh-bits", .key = 129,
2571
1049
.arg = "BITS",
2572
1050
.doc = "Bit length of the prime number used in the"
2573
1051
" Diffie-Hellman key exchange",
2574
1052
.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
1053
{ .name = "priority", .key = 130,
2581
1054
.arg = "STRING",
2582
1055
.doc = "GnuTLS priority string for the TLS handshake",
2585
1058
.arg = "SECONDS",
2586
1059
.doc = "Maximum delay to wait for interface startup",
2587
1060
.group = 2 },
2588
{ .name = "retry", .key = 132,
2589
.arg = "SECONDS",
2590
.doc = "Retry interval used when denied by the Mandos server",
2591
.group = 2 },
2592
{ .name = "network-hook-dir", .key = 133,
2593
.arg = "DIR",
2594
.doc = "Directory where network hooks are located",
2595
.group = 2 },
2596
/*
2597
* These reproduce what we would get without ARGP_NO_HELP
2598
*/
2599
{ .name = "help", .key = '?',
2600
.doc = "Give this help list", .group = -1 },
2601
{ .name = "usage", .key = -3,
2602
.doc = "Give a short usage message", .group = -1 },
2603
{ .name = "version", .key = 'V',
2604
.doc = "Print program version", .group = -1 },
2605
1061
{ .name = NULL }
2606
1062
};
2607
1063
2608
1064
error_t parse_opt(int key, char *arg,
2609
1065
struct argp_state *state){
2610
errno = 0;
2611
1066
switch(key){
2612
1067
case 128: /* --debug */
2613
1068
debug = true;
2616
1071
connect_to = arg;
2617
1072
break;
2618
1073
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
}
1074
interface = arg;
2624
1075
break;
2625
1076
case 's': /* --seckey */
2626
1077
seckey = arg;
2628
1079
case 'p': /* --pubkey */
2629
1080
pubkey = arg;
2630
1081
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
1082
case 129: /* --dh-bits */
2642
1083
errno = 0;
2643
1084
tmpmax = strtoimax(arg, &tmp, 10);
2644
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
2645
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2646
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
2647
1089
}
2648
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2649
1091
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
2653
1092
case 130: /* --priority */
2654
1093
mc.priority = arg;
2655
1094
break;
2657
1096
errno = 0;
2658
1097
delay = strtof(arg, &tmp);
2659
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
2660
argp_error(state, "Bad delay");
2661
}
2662
case 132: /* --retry */
2663
errno = 0;
2664
retry_interval = strtod(arg, &tmp);
2665
if(errno != 0 or tmp == arg or *tmp != '\0'
2666
or (retry_interval * 1000) > INT_MAX
2667
or retry_interval < 0){
2668
argp_error(state, "Bad retry interval");
2669
}
2670
break;
2671
case 133: /* --network-hook-dir */
2672
hookdir = arg;
2673
break;
2674
/*
2675
* These reproduce what we would get without ARGP_NO_HELP
2676
*/
2677
case '?': /* --help */
2678
argp_state_help(state, state->out_stream,
2679
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
case -3: /* --usage */
2683
argp_state_help(state, state->out_stream,
2684
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
case 'V': /* --version */
2687
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
exit(argp_err_exit_status);
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
2689
1106
break;
2690
1107
default:
2691
1108
return ARGP_ERR_UNKNOWN;
2692
1109
}
2693
return errno;
1110
return 0;
2694
1111
}
2695
1112
2696
1113
struct argp argp = { .options = options, .parser = parse_opt,
2697
1114
.args_doc = "",
2698
1115
.doc = "Mandos client -- Get and decrypt"
2699
1116
" 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){
2703
case 0:
2704
break;
2705
case ENOMEM:
2706
default:
2707
errno = ret_errno;
2708
perror_plus("argp_parse");
2709
exitcode = EX_OSERR;
2710
goto end;
2711
case EINVAL:
2712
exitcode = EX_USAGE;
2713
goto end;
2714
}
2715
}
2716
2717
{
2718
/* Re-raise privileges */
2719
ret = raise_privileges();
2720
if(ret != 0){
2721
errno = ret;
2722
perror_plus("Failed to raise privileges");
2723
} else {
2724
struct stat st;
2725
2726
/* Work around Debian bug #633582:
2727
<https://bugs.debian.org/633582> */
2728
2729
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2730
int seckey_fd = open(seckey, O_RDONLY);
2731
if(seckey_fd == -1){
2732
perror_plus("open");
2733
} else {
2734
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2735
if(ret == -1){
2736
perror_plus("fstat");
2737
} else {
2738
if(S_ISREG(st.st_mode)
2739
and st.st_uid == 0 and st.st_gid == 0){
2740
ret = fchown(seckey_fd, uid, gid);
2741
if(ret == -1){
2742
perror_plus("fchown");
2743
}
2744
}
2745
}
2746
close(seckey_fd);
2747
}
2748
}
2749
2750
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2751
int pubkey_fd = open(pubkey, O_RDONLY);
2752
if(pubkey_fd == -1){
2753
perror_plus("open");
2754
} else {
2755
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2756
if(ret == -1){
2757
perror_plus("fstat");
2758
} else {
2759
if(S_ISREG(st.st_mode)
2760
and st.st_uid == 0 and st.st_gid == 0){
2761
ret = fchown(pubkey_fd, uid, gid);
2762
if(ret == -1){
2763
perror_plus("fchown");
2764
}
2765
}
2766
}
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
2793
/* Work around Debian bug #981302
2794
<https://bugs.debian.org/981302> */
2795
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2796
ret = symlink("/proc/self/fd", "/dev/fd");
2797
if(ret == -1){
2798
perror_plus("Failed to create /dev/fd symlink");
2799
}
2800
}
2801
2802
/* Lower privileges */
2803
ret = lower_privileges();
2804
if(ret != 0){
2805
errno = ret;
2806
perror_plus("Failed to lower privileges");
2807
}
2808
}
2809
}
2810
2811
/* Remove invalid interface names (except "none") */
2812
{
2813
char *interface = NULL;
2814
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2815
interface))){
2816
if(strcmp(interface, "none") != 0
2817
and if_nametoindex(interface) == 0){
2818
if(interface[0] != '\0'){
2819
fprintf_plus(stderr, "Not using nonexisting interface"
2820
" \"%s\"\n", interface);
2821
}
2822
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2823
interface = NULL;
2824
}
2825
}
2826
}
2827
2828
/* Run network hooks */
2829
{
2830
if(mc.interfaces != NULL){
2831
interfaces_hooks = malloc(mc.interfaces_size);
2832
if(interfaces_hooks == NULL){
2833
perror_plus("malloc");
2834
goto end;
2835
}
2836
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2837
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2838
}
2839
run_network_hooks("start", interfaces_hooks != NULL ?
2840
interfaces_hooks : "", delay);
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
2841
1123
}
2842
1124
2843
1125
if(not debug){
2848
1130
from the signal handler */
2849
1131
/* Initialize the pseudo-RNG for Avahi */
2850
1132
srand((unsigned int) time(NULL));
2851
simple_poll = avahi_simple_poll_new();
2852
if(simple_poll == NULL){
2853
fprintf_plus(stderr,
2854
"Avahi: Failed to create simple poll object.\n");
2855
exitcode = EX_UNAVAILABLE;
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
2856
1137
goto end;
2857
1138
}
2858
1139
2859
1140
sigemptyset(&sigterm_action.sa_mask);
2860
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2861
1142
if(ret == -1){
2862
perror_plus("sigaddset");
2863
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2864
1145
goto end;
2865
1146
}
2866
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2867
1148
if(ret == -1){
2868
perror_plus("sigaddset");
2869
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2870
1151
goto end;
2871
1152
}
2872
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2873
1154
if(ret == -1){
2874
perror_plus("sigaddset");
2875
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2876
1157
goto end;
2877
1158
}
2878
1159
/* Need to check if the handler is SIG_IGN before handling:
2881
1162
*/
2882
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2883
1164
if(ret == -1){
2884
perror_plus("sigaction");
2885
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2886
1167
}
2887
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2888
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
2889
1170
if(ret == -1){
2890
perror_plus("sigaction");
2891
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2892
1173
goto end;
2893
1174
}
2894
1175
}
2895
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2896
1177
if(ret == -1){
2897
perror_plus("sigaction");
2898
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2899
1180
}
2900
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
2901
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2902
1183
if(ret == -1){
2903
perror_plus("sigaction");
2904
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2905
1186
goto end;
2906
1187
}
2907
1188
}
2908
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2909
1190
if(ret == -1){
2910
perror_plus("sigaction");
2911
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2912
1193
}
2913
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2914
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2915
1196
if(ret == -1){
2916
perror_plus("sigaction");
2917
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2918
1199
goto end;
2919
1200
}
2920
1201
}
2921
1202
2922
/* If no interfaces were specified, make a list */
2923
if(mc.interfaces == NULL){
2924
struct dirent **direntries = NULL;
2925
/* Look for any good interfaces */
2926
ret = scandir(sys_class_net, &direntries, good_interface,
2927
alphasort);
2928
if(ret >= 1){
2929
/* Add all found interfaces to interfaces list */
2930
for(int i = 0; i < ret; ++i){
2931
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2932
direntries[i]->d_name);
2933
if(ret_errno != 0){
2934
errno = ret_errno;
2935
perror_plus("argz_add");
2936
free(direntries[i]);
2937
continue;
2938
}
2939
if(debug){
2940
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2941
direntries[i]->d_name);
2942
}
2943
free(direntries[i]);
2944
}
2945
free(direntries);
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
2946
1338
} else {
2947
if(ret == 0){
2948
free(direntries);
2949
}
2950
fprintf_plus(stderr, "Could not find a network interface\n");
2951
exitcode = EXIT_FAILURE;
2952
goto end;
2953
}
2954
}
2955
2956
/* Bring up interfaces which are down, and remove any "none"s */
2957
{
2958
char *interface = NULL;
2959
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2960
interface))){
2961
/* If interface name is "none", stop bringing up interfaces.
2962
Also remove all instances of "none" from the list */
2963
if(strcmp(interface, "none") == 0){
2964
argz_delete(&mc.interfaces, &mc.interfaces_size,
2965
interface);
2966
interface = NULL;
2967
while((interface = argz_next(mc.interfaces,
2968
mc.interfaces_size, interface))){
2969
if(strcmp(interface, "none") == 0){
2970
argz_delete(&mc.interfaces, &mc.interfaces_size,
2971
interface);
2972
interface = NULL;
2973
}
2974
}
2975
break;
2976
}
2977
bool interface_was_up = interface_is_up(interface);
2978
errno = bring_up_interface(interface, delay);
2979
if(not interface_was_up){
2980
if(errno != 0){
2981
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2982
" %s\n", interface, strerror(errno));
2983
} else {
2984
errno = argz_add(&interfaces_to_take_down,
2985
&interfaces_to_take_down_size,
2986
interface);
2987
if(errno != 0){
2988
perror_plus("argz_add");
2989
}
2990
}
2991
}
2992
}
2993
if(debug and (interfaces_to_take_down == NULL)){
2994
fprintf_plus(stderr, "No interfaces were brought up\n");
2995
}
2996
}
2997
2998
/* If we only got one interface, explicitly use only that one */
2999
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
3000
if(debug){
3001
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3002
mc.interfaces);
3003
}
3004
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
3005
1345
}
3006
1346
3007
1347
if(quit_now){
3008
1348
goto end;
3009
1349
}
3010
1350
3011
#if GNUTLS_VERSION_NUMBER >= 0x030606
3012
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3013
#elif GNUTLS_VERSION_NUMBER < 0x030600
3014
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3015
#else
3016
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3017
#endif
1351
ret = init_gnutls_global(pubkey, seckey);
3018
1352
if(ret == -1){
3019
fprintf_plus(stderr, "init_gnutls_global failed\n");
3020
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
3021
1355
goto end;
3022
1356
} else {
3023
1357
gnutls_initialized = true;
3027
1361
goto end;
3028
1362
}
3029
1363
3030
/* Try /run/tmp before /tmp */
3031
tempdir = mkdtemp(run_tempdir);
3032
if(tempdir == NULL and errno == ENOENT){
3033
if(debug){
3034
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3035
run_tempdir, old_tempdir);
3036
}
3037
tempdir = mkdtemp(old_tempdir);
3038
}
3039
if(tempdir == NULL){
3040
perror_plus("mkdtemp");
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
3041
1368
goto end;
3042
1369
}
3043
1370
3045
1372
goto end;
3046
1373
}
3047
1374
3048
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3049
fprintf_plus(stderr, "init_gpgme failed\n");
3050
exitcode = EX_UNAVAILABLE;
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
3051
1378
goto end;
3052
1379
} else {
3053
1380
gpgme_initialized = true;
3061
1388
/* Connect directly, do not use Zeroconf */
3062
1389
/* (Mainly meant for debugging) */
3063
1390
char *address = strrchr(connect_to, ':');
3064
3065
1391
if(address == NULL){
3066
fprintf_plus(stderr, "No colon in address\n");
3067
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
3068
1394
goto end;
3069
1395
}
3070
1396
3072
1398
goto end;
3073
1399
}
3074
1400
3075
in_port_t port;
1401
uint16_t port;
3076
1402
errno = 0;
3077
1403
tmpmax = strtoimax(address+1, &tmp, 10);
3078
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3079
or tmpmax != (in_port_t)tmpmax){
3080
fprintf_plus(stderr, "Bad port number\n");
3081
exitcode = EX_USAGE;
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
3082
1408
goto end;
3083
1409
}
3084
1410
3085
1411
if(quit_now){
3086
1412
goto end;
3087
1413
}
3088
1414
3089
port = (in_port_t)tmpmax;
1415
port = (uint16_t)tmpmax;
3090
1416
*address = '\0';
1417
address = connect_to;
3091
1418
/* Colon in address indicates IPv6 */
3092
1419
int af;
3093
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
3094
1421
af = AF_INET6;
3095
/* Accept [] around IPv6 address - see RFC 5952 */
3096
if(connect_to[0] == '[' and address[-1] == ']')
3097
{
3098
connect_to++;
3099
address[-1] = '\0';
3100
}
3101
1422
} else {
3102
1423
af = AF_INET;
3103
1424
}
3104
address = connect_to;
3105
1425
3106
1426
if(quit_now){
3107
1427
goto end;
3108
1428
}
3109
1429
3110
while(not quit_now){
3111
ret = start_mandos_communication(address, port, if_index, af,
3112
&mc);
3113
if(quit_now or ret == 0){
3114
break;
3115
}
3116
if(debug){
3117
fprintf_plus(stderr, "Retrying in %d seconds\n",
3118
(int)retry_interval);
3119
}
3120
sleep((unsigned int)retry_interval);
3121
}
3122
3123
if(not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
3124
1434
exitcode = EXIT_SUCCESS;
3125
1435
}
3126
3127
1436
goto end;
3128
1437
}
3129
1438
3141
1450
config.publish_domain = 0;
3142
1451
3143
1452
/* Allocate a new server */
3144
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3145
&config, NULL, NULL, &ret);
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
3146
1456
3147
1457
/* Free the Avahi configuration data */
3148
1458
avahi_server_config_free(&config);
3150
1460
3151
1461
/* Check if creating the Avahi server object succeeded */
3152
1462
if(mc.server == NULL){
3153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3154
avahi_strerror(ret));
3155
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
3156
1466
goto end;
3157
1467
}
3158
1468
3163
1473
/* Create the Avahi service browser */
3164
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
3165
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3166
NULL, 0, browse_callback,
3167
(void *)&mc);
1476
NULL, 0, browse_callback, NULL);
3168
1477
if(sb == NULL){
3169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3170
avahi_strerror(avahi_server_errno(mc.server)));
3171
exitcode = EX_UNAVAILABLE;
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
3172
1481
goto end;
3173
1482
}
3174
1483
3179
1488
/* Run the main loop */
3180
1489
3181
1490
if(debug){
3182
fprintf_plus(stderr, "Starting Avahi loop search\n");
1491
fprintf(stderr, "Starting Avahi loop search\n");
3183
1492
}
3184
1493
3185
ret = avahi_loop_with_timeout(simple_poll,
3186
(int)(retry_interval * 1000), &mc);
3187
if(debug){
3188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3189
(ret == 0) ? "successfully" : "with error");
3190
}
1494
avahi_simple_poll_loop(mc.simple_poll);
3191
1495
3192
1496
end:
3193
1497
3194
1498
if(debug){
3195
if(signal_received){
3196
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3197
argv[0], signal_received,
3198
strsignal(signal_received));
3199
} else {
3200
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3201
}
1499
fprintf(stderr, "%s exiting\n", argv[0]);
3202
1500
}
3203
1501
3204
1502
/* Cleanup things */
3205
free(mc.interfaces);
3206
3207
1503
if(sb != NULL)
3208
1504
avahi_s_service_browser_free(sb);
3209
1505
3210
1506
if(mc.server != NULL)
3211
1507
avahi_server_free(mc.server);
3212
1508
3213
if(simple_poll != NULL)
3214
avahi_simple_poll_free(simple_poll);
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
3215
1511
3216
1512
if(gnutls_initialized){
3217
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
3218
1515
gnutls_dh_params_deinit(mc.dh_params);
3219
1516
}
3220
1517
3222
1519
gpgme_release(mc.ctx);
3223
1520
}
3224
1521
3225
/* Cleans up the circular linked list of Mandos servers the client
3226
has seen */
3227
if(mc.current_server != NULL){
3228
mc.current_server->prev->next = NULL;
3229
while(mc.current_server != NULL){
3230
server *next = mc.current_server->next;
3231
#ifdef __GNUC__
3232
#pragma GCC diagnostic push
3233
#pragma GCC diagnostic ignored "-Wcast-qual"
3234
#endif
3235
free((char *)(mc.current_server->ip));
3236
#ifdef __GNUC__
3237
#pragma GCC diagnostic pop
3238
#endif
3239
free(mc.current_server);
3240
mc.current_server = next;
3241
}
3242
}
3243
3244
/* Re-raise privileges */
3245
{
3246
ret = raise_privileges();
3247
if(ret != 0){
3248
errno = ret;
3249
perror_plus("Failed to raise privileges");
3250
} else {
3251
3252
/* Run network hooks */
3253
run_network_hooks("stop", interfaces_hooks != NULL ?
3254
interfaces_hooks : "", delay);
3255
3256
/* Take down the network interfaces which were brought up */
3257
{
3258
char *interface = NULL;
3259
while((interface = argz_next(interfaces_to_take_down,
3260
interfaces_to_take_down_size,
3261
interface))){
3262
ret = take_down_interface(interface);
3263
if(ret != 0){
3264
errno = ret;
3265
perror_plus("Failed to take down interface");
3266
}
3267
}
3268
if(debug and (interfaces_to_take_down == NULL)){
3269
fprintf_plus(stderr, "No interfaces needed to be taken"
3270
" down\n");
3271
}
3272
}
3273
}
3274
3275
ret = lower_privileges_permanently();
3276
if(ret != 0){
3277
errno = ret;
3278
perror_plus("Failed to lower privileges permanently");
3279
}
3280
}
3281
3282
free(interfaces_to_take_down);
3283
free(interfaces_hooks);
3284
3285
void clean_dir_at(int base, const char * const dirname,
3286
uintmax_t level){
3287
struct dirent **direntries = NULL;
3288
int dret;
3289
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3290
O_RDONLY
3291
| O_NOFOLLOW
3292
| O_DIRECTORY
3293
| O_PATH));
3294
if(dir_fd == -1){
3295
perror_plus("open");
3296
return;
3297
}
3298
int numentries = scandirat(dir_fd, ".", &direntries,
3299
notdotentries, alphasort);
3300
if(numentries >= 0){
3301
for(int i = 0; i < numentries; i++){
3302
if(debug){
3303
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3304
dirname, direntries[i]->d_name);
3305
}
3306
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3307
if(dret == -1){
3308
if(errno == EISDIR){
3309
dret = unlinkat(dir_fd, direntries[i]->d_name,
3310
AT_REMOVEDIR);
3311
}
3312
if((dret == -1) and (errno == ENOTEMPTY)
3313
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3314
== 0) and (level == 0)){
3315
/* Recurse only in this special case */
3316
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3317
dret = 0;
3318
}
3319
if((dret == -1) and (errno != ENOENT)){
3320
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3321
direntries[i]->d_name, strerror(errno));
3322
}
3323
}
3324
free(direntries[i]);
3325
}
3326
3327
/* need to clean even if 0 because man page doesn't specify */
3328
free(direntries);
3329
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3330
if(dret == -1 and errno != ENOENT){
3331
perror_plus("rmdir");
3332
}
3333
} else {
3334
perror_plus("scandirat");
3335
}
3336
close(dir_fd);
3337
}
3338
3339
/* Removes the GPGME temp directory and all files inside */
3340
if(tempdir != NULL){
3341
clean_dir_at(-1, tempdir, 0);
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
3342
1596
}
3343
1597
3344
1598
if(quit_now){
3345
1599
sigemptyset(&old_sigterm_action.sa_mask);
3346
1600
old_sigterm_action.sa_handler = SIG_DFL;
3347
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3348
&old_sigterm_action,
3349
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
3350
1602
if(ret == -1){
3351
perror_plus("sigaction");
3352
}
3353
do {
3354
ret = raise(signal_received);
3355
} while(ret != 0 and errno == EINTR);
3356
if(ret != 0){
3357
perror_plus("raise");
3358
abort();
3359
}
3360
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
3361
1606
}
3362
1607
3363
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0