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- Committer: teddy at recompile
- Date: 2020-07-04 11:58:52 UTC
- Revision ID: teddy@recompile.se-20200704115852-oquhnmng3zom4ldl
Update copyright year
* DBUS-API: Update copyright year to 2020
* debian/copyright: - '' -
* dracut-module/ask-password-mandos.service: - '' -
* dracut-module/password-agent.c: - '' -
* mandos: - '' -
* mandos-ctl: - '' -
* plugin-runner.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/plymouth.c: - '' -
* mandos-to-cryptroot-unlock: Update copyright year to 2019.
* DBUS-API: Update copyright year to 2020
* debian/copyright: - '' -
* dracut-module/ask-password-mandos.service: - '' -
* dracut-module/password-agent.c: - '' -
* mandos: - '' -
* mandos-ctl: - '' -
* plugin-runner.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/plymouth.c: - '' -
* mandos-to-cryptroot-unlock: Update copyright year to 2019.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
31
32
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
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 */
66
73
#include <time.h> /* nanosleep(), time(), sleep() */
67
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
75
SIOCSIFFLAGS, if_indextoname(),
72
79
*/
73
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
81
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
77
85
#include <iso646.h> /* not, or, and */
78
86
#include <argp.h> /* struct argp_option, error_t, struct
79
87
argp_state, struct argp,
84
92
raise() */
85
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
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() */
87
104
88
105
#ifdef __linux__
89
106
#include <sys/klog.h> /* klogctl() */
106
123
gnutls_*
107
124
init_gnutls_session(),
108
125
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
109
127
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
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
112
135
113
136
/* GPGME */
114
137
#include <gpgme.h> /* All GPGME types, constants and
122
145
#define PATHDIR "/conf/conf.d/mandos"
123
146
#define SECKEY "seckey.txt"
124
147
#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"
125
151
126
152
bool debug = false;
127
153
static const char mandos_protocol_version[] = "1";
128
154
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
156
static const char sys_class_net[] = "/sys/class/net";
131
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;
132
162
133
/* Doubly linked list that need to be circular linked when ever used */
163
/* Doubly linked list that need to be circularly linked when used */
134
164
typedef struct server{
135
165
const char *ip;
136
uint16_t port;
166
in_port_t port;
137
167
AvahiIfIndex if_index;
138
168
int af;
139
169
struct timespec last_seen;
143
173
144
174
/* Used for passing in values through the Avahi callback functions */
145
175
typedef struct {
146
AvahiSimplePoll *simple_poll;
147
176
AvahiServer *server;
148
177
gnutls_certificate_credentials_t cred;
149
178
unsigned int dh_bits;
151
180
const char *priority;
152
181
gpgme_ctx_t ctx;
153
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
154
185
} mandos_context;
155
186
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
160
189
161
190
sig_atomic_t quit_now = 0;
162
191
int signal_received = 0;
163
192
164
193
/* Function to use when printing errors */
165
194
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
195
int e = errno;
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
198
errno = e;
167
199
perror(print_text);
168
200
}
169
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
}
211
170
212
/*
171
213
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
214
* bytes. "buffer_capacity" is how much is currently allocated,
173
215
* "buffer_length" is how much is already used.
174
216
*/
217
__attribute__((nonnull, warn_unused_result))
175
218
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
219
size_t buffer_capacity){
177
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
179
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
180
227
return 0;
181
228
}
229
*buffer = new_buf;
182
230
buffer_capacity += BUFFER_SIZE;
183
231
}
184
232
return buffer_capacity;
185
233
}
186
234
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
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){
190
239
int ret;
191
240
server *new_server = malloc(sizeof(server));
192
241
if(new_server == NULL){
193
242
perror_plus("malloc");
194
return -1;
243
return false;
195
244
}
196
245
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
246
.port = port,
247
.if_index = if_index,
248
.af = af };
200
249
if(new_server->ip == NULL){
201
250
perror_plus("strdup");
202
return -1;
203
}
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
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){
206
270
new_server->next = new_server;
207
271
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
272
*current_server = new_server;
210
273
} else {
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
213
277
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
215
}
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
if(ret == -1){
218
perror_plus("clock_gettime");
219
return -1;
220
}
221
return 0;
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;
222
333
}
223
334
224
335
/*
225
336
* Initialize GPGME.
226
337
*/
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
229
343
gpgme_error_t rc;
230
344
gpgme_engine_info_t engine_info;
231
345
232
233
346
/*
234
347
* Helper function to insert pub and seckey to the engine keyring.
235
348
*/
236
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
237
350
int ret;
238
351
int fd;
239
352
gpgme_data_t pgp_data;
244
357
return false;
245
358
}
246
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
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
247
409
rc = gpgme_data_new_from_fd(&pgp_data, fd);
248
410
if(rc != GPG_ERR_NO_ERROR){
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
gpgme_strsource(rc), gpgme_strerror(rc));
411
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
251
413
return false;
252
414
}
253
415
254
rc = gpgme_op_import(mc.ctx, pgp_data);
416
rc = gpgme_op_import(mc->ctx, pgp_data);
255
417
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
418
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
419
gpgme_strsource(rc), gpgme_strerror(rc));
258
420
return false;
259
421
}
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
}
260
497
261
ret = (int)TEMP_FAILURE_RETRY(close(fd));
498
ret = close(fd);
262
499
if(ret == -1){
263
500
perror_plus("close");
264
501
}
267
504
}
268
505
269
506
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
507
fprintf_plus(stderr, "Initializing GPGME\n");
271
508
}
272
509
273
510
/* Init GPGME */
274
511
gpgme_check_version(NULL);
275
512
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
276
513
if(rc != GPG_ERR_NO_ERROR){
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
514
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
515
gpgme_strsource(rc), gpgme_strerror(rc));
279
516
return false;
280
517
}
281
518
282
/* Set GPGME home directory for the OpenPGP engine only */
519
/* Set GPGME home directory for the OpenPGP engine only */
283
520
rc = gpgme_get_engine_info(&engine_info);
284
521
if(rc != GPG_ERR_NO_ERROR){
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
522
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
523
gpgme_strsource(rc), gpgme_strerror(rc));
287
524
return false;
288
525
}
289
526
while(engine_info != NULL){
295
532
engine_info = engine_info->next;
296
533
}
297
534
if(engine_info == NULL){
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
535
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
536
tempdir);
299
537
return false;
300
538
}
301
539
302
540
/* Create new GPGME "context" */
303
rc = gpgme_new(&(mc.ctx));
541
rc = gpgme_new(&(mc->ctx));
304
542
if(rc != GPG_ERR_NO_ERROR){
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
307
545
return false;
308
546
}
309
547
318
556
* Decrypt OpenPGP data.
319
557
* Returns -1 on error
320
558
*/
559
__attribute__((nonnull, warn_unused_result))
321
560
static ssize_t pgp_packet_decrypt(const char *cryptotext,
322
561
size_t crypto_size,
323
char **plaintext){
562
char **plaintext,
563
mandos_context *mc){
324
564
gpgme_data_t dh_crypto, dh_plain;
325
565
gpgme_error_t rc;
326
566
ssize_t ret;
328
568
ssize_t plaintext_length = 0;
329
569
330
570
if(debug){
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
571
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
332
572
}
333
573
334
574
/* Create new GPGME data buffer from memory cryptotext */
335
575
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
336
576
0);
337
577
if(rc != GPG_ERR_NO_ERROR){
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
578
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
579
gpgme_strsource(rc), gpgme_strerror(rc));
340
580
return -1;
341
581
}
342
582
343
583
/* Create new empty GPGME data buffer for the plaintext */
344
584
rc = gpgme_data_new(&dh_plain);
345
585
if(rc != GPG_ERR_NO_ERROR){
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
587
gpgme_strsource(rc), gpgme_strerror(rc));
348
588
gpgme_data_release(dh_crypto);
349
589
return -1;
350
590
}
351
591
352
592
/* Decrypt data from the cryptotext data buffer to the plaintext
353
593
data buffer */
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
594
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
355
595
if(rc != GPG_ERR_NO_ERROR){
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
596
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
597
gpgme_strsource(rc), gpgme_strerror(rc));
358
598
plaintext_length = -1;
359
599
if(debug){
360
600
gpgme_decrypt_result_t result;
361
result = gpgme_op_decrypt_result(mc.ctx);
601
result = gpgme_op_decrypt_result(mc->ctx);
362
602
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
603
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
364
604
} else {
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
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");
369
611
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
612
fprintf_plus(stderr, "File name: %s\n", result->file_name);
371
613
}
372
gpgme_recipient_t recipient;
373
recipient = result->recipients;
374
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "No" : "Yes");
381
recipient = recipient->next;
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");
382
622
}
383
623
}
384
624
}
386
626
}
387
627
388
628
if(debug){
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
629
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
390
630
}
391
631
392
632
/* Seek back to the beginning of the GPGME plaintext data buffer */
399
639
*plaintext = NULL;
400
640
while(true){
401
641
plaintext_capacity = incbuffer(plaintext,
402
(size_t)plaintext_length,
403
plaintext_capacity);
642
(size_t)plaintext_length,
643
plaintext_capacity);
404
644
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
645
perror_plus("incbuffer");
646
plaintext_length = -1;
647
goto decrypt_end;
408
648
}
409
649
410
650
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
423
663
}
424
664
425
665
if(debug){
426
fprintf(stderr, "Decrypted password is: ");
666
fprintf_plus(stderr, "Decrypted password is: ");
427
667
for(ssize_t i = 0; i < plaintext_length; i++){
428
668
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
429
669
}
440
680
return plaintext_length;
441
681
}
442
682
443
static const char * safer_gnutls_strerror(int value){
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
446
if(ret == NULL)
447
ret = "(unknown)";
448
return ret;
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);
449
694
}
450
695
451
696
/* GnuTLS log function callback */
697
__attribute__((nonnull))
452
698
static void debuggnutls(__attribute__((unused)) int level,
453
699
const char* string){
454
fprintf(stderr, "GnuTLS: %s", string);
700
fprintf_plus(stderr, "GnuTLS: %s", string);
455
701
}
456
702
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
457
704
static int init_gnutls_global(const char *pubkeyfilename,
458
const char *seckeyfilename){
705
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
mandos_context *mc){
459
708
int ret;
460
709
461
710
if(debug){
462
fprintf(stderr, "Initializing GnuTLS\n");
463
}
464
465
ret = gnutls_global_init();
466
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
469
return -1;
711
fprintf_plus(stderr, "Initializing GnuTLS\n");
470
712
}
471
713
472
714
if(debug){
478
720
}
479
721
480
722
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
723
ret = gnutls_certificate_allocate_credentials(&mc->cred);
482
724
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
725
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
safer_gnutls_strerror(ret));
489
727
return -1;
490
728
}
491
729
492
730
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
733
pubkeyfilename,
734
seckeyfilename);
496
735
}
497
736
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
498
750
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
751
(mc->cred, pubkeyfilename, seckeyfilename,
500
752
GNUTLS_OPENPGP_FMT_BASE64);
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
501
756
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
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));
507
762
goto globalfail;
508
763
}
509
764
510
765
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
515
goto globalfail;
516
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
521
goto globalfail;
522
}
523
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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
}
525
955
526
956
return 0;
527
957
528
958
globalfail:
529
959
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
960
gnutls_certificate_free_credentials(mc->cred);
961
gnutls_dh_params_deinit(mc->dh_params);
533
962
return -1;
534
963
}
535
964
536
static int init_gnutls_session(gnutls_session_t *session){
965
__attribute__((nonnull, warn_unused_result))
966
static int init_gnutls_session(gnutls_session_t *session,
967
mandos_context *mc){
537
968
int ret;
538
969
/* GnuTLS session creation */
539
970
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
541
979
if(quit_now){
542
980
return -1;
543
981
}
544
982
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
983
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
984
fprintf_plus(stderr,
985
"Error in GnuTLS session initialization: %s\n",
986
safer_gnutls_strerror(ret));
548
987
}
549
988
550
989
{
551
990
const char *err;
552
991
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
992
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
993
if(quit_now){
555
994
gnutls_deinit(*session);
556
995
return -1;
557
996
}
558
997
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
998
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
999
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1000
fprintf_plus(stderr, "GnuTLS error: %s\n",
1001
safer_gnutls_strerror(ret));
563
1002
gnutls_deinit(*session);
564
1003
return -1;
565
1004
}
567
1006
568
1007
do {
569
1008
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
1009
mc->cred);
571
1010
if(quit_now){
572
1011
gnutls_deinit(*session);
573
1012
return -1;
574
1013
}
575
1014
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
1015
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
1016
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1017
safer_gnutls_strerror(ret));
579
1018
gnutls_deinit(*session);
580
1019
return -1;
581
1020
}
583
1022
/* ignore client certificate if any. */
584
1023
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
1024
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
587
588
1025
return 0;
589
1026
}
590
1027
592
1029
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
593
1030
__attribute__((unused)) const char *txt){}
594
1031
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
595
1205
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
1206
__attribute__((nonnull, warn_unused_result))
1207
static int start_mandos_communication(const char *ip, in_port_t port,
597
1208
AvahiIfIndex if_index,
598
int af){
1209
int af, mandos_context *mc){
599
1210
int ret, tcp_sd = -1;
600
1211
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
1212
struct sockaddr_storage to;
605
1213
char *buffer = NULL;
606
1214
char *decrypted_buffer = NULL;
607
1215
size_t buffer_length = 0;
610
1218
int retval = -1;
611
1219
gnutls_session_t session;
612
1220
int pf; /* Protocol family */
1221
bool route_added = false;
613
1222
614
1223
errno = 0;
615
1224
626
1235
pf = PF_INET;
627
1236
break;
628
1237
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
1238
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
1239
errno = EINVAL;
631
1240
return -1;
632
1241
}
633
1242
634
ret = init_gnutls_session(&session);
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);
635
1277
if(ret != 0){
636
1278
return -1;
637
1279
}
638
1280
639
1281
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
1282
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1283
PRIuMAX "\n", ip, (uintmax_t)port);
642
1284
}
643
1285
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
645
1287
if(tcp_sd < 0){
646
1288
int e = errno;
647
1289
perror_plus("socket");
654
1296
goto mandos_end;
655
1297
}
656
1298
657
memset(&to, 0, sizeof(to));
658
1299
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
661
1303
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
664
1307
}
665
1308
if(ret < 0 ){
666
1309
int e = errno;
670
1313
}
671
1314
if(ret == 0){
672
1315
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
1316
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
1317
errno = e;
675
1318
goto mandos_end;
676
1319
}
677
1320
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
1321
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1322
if(IN6_IS_ADDR_LINKLOCAL
1323
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
685
1324
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
1325
fprintf_plus(stderr, "An IPv6 link-local address is"
1326
" incomplete without a network interface\n");
688
1327
errno = EINVAL;
689
1328
goto mandos_end;
690
1329
}
691
1330
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
1332
}
694
1333
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
698
1335
}
699
1336
700
1337
if(quit_now){
708
1345
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
1346
perror_plus("if_indextoname");
710
1347
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1348
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1349
"\n", ip, interface, (uintmax_t)port);
713
1350
}
714
1351
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
1352
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1353
ip, (uintmax_t)port);
717
1354
}
718
1355
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
1356
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
734
}
735
}
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
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;
759
1437
}
760
1438
761
1439
const char *out = mandos_protocol_version;
763
1441
while(true){
764
1442
size_t out_size = strlen(out);
765
1443
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
1444
out_size - written));
767
1445
if(ret == -1){
768
1446
int e = errno;
769
1447
perror_plus("write");
789
1467
}
790
1468
791
1469
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1470
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
1471
}
794
1472
795
1473
if(quit_now){
796
1474
errno = EINTR;
797
1475
goto mandos_end;
798
1476
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1477
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);
802
1483
803
1484
if(quit_now){
804
1485
errno = EINTR;
815
1496
816
1497
if(ret != GNUTLS_E_SUCCESS){
817
1498
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1499
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
1500
gnutls_perror(ret);
820
1501
}
821
1502
errno = EPROTO;
825
1506
/* Read OpenPGP packet that contains the wanted password */
826
1507
827
1508
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
1509
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1510
" %s\n", ip);
830
1511
}
831
1512
832
1513
while(true){
837
1518
}
838
1519
839
1520
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
1521
buffer_capacity);
841
1522
if(buffer_capacity == 0){
842
1523
int e = errno;
843
1524
perror_plus("incbuffer");
870
1551
}
871
1552
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
1553
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1554
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1555
"***\n");
874
1556
gnutls_perror(ret);
875
1557
errno = EPROTO;
876
1558
goto mandos_end;
877
1559
}
878
1560
break;
879
1561
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
1562
fprintf_plus(stderr, "Unknown error while reading data from"
1563
" encrypted session with Mandos server\n");
882
1564
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
1565
errno = EIO;
884
1566
goto mandos_end;
889
1571
}
890
1572
891
1573
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
1574
fprintf_plus(stderr, "Closing TLS session\n");
893
1575
}
894
1576
895
1577
if(quit_now){
907
1589
908
1590
if(buffer_length > 0){
909
1591
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
1592
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1593
&decrypted_buffer, mc);
913
1594
if(decrypted_buffer_size >= 0){
914
1595
1596
clearerr(stdout);
915
1597
written = 0;
916
1598
while(written < (size_t) decrypted_buffer_size){
917
1599
if(quit_now){
925
1607
if(ret == 0 and ferror(stdout)){
926
1608
int e = errno;
927
1609
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1610
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1611
strerror(errno));
930
1612
}
931
1613
errno = e;
932
1614
goto mandos_end;
933
1615
}
934
1616
written += (size_t)ret;
935
1617
}
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
}
936
1628
retval = 0;
937
1629
}
938
1630
}
941
1633
942
1634
mandos_end:
943
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
}
944
1642
int e = errno;
945
1643
free(decrypted_buffer);
946
1644
free(buffer);
947
1645
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1646
ret = close(tcp_sd);
949
1647
}
950
1648
if(ret == -1){
951
1649
if(e == 0){
976
1674
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1675
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1676
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1677
void *mc){
1678
if(r == NULL){
1679
return;
1680
}
981
1681
982
1682
/* Called whenever a service has been resolved successfully or
983
1683
timed out */
984
1684
985
1685
if(quit_now){
1686
avahi_s_service_resolver_free(r);
986
1687
return;
987
1688
}
988
1689
989
1690
switch(event){
990
1691
default:
991
1692
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
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)));
995
1698
break;
996
1699
997
1700
case AVAHI_RESOLVER_FOUND:
999
1702
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1703
avahi_address_snprint(ip, sizeof(ip), address);
1001
1704
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
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);
1005
1708
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1709
int ret = start_mandos_communication(ip, (in_port_t)port,
1710
interface,
1711
avahi_proto_to_af(proto),
1712
mc);
1008
1713
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1714
avahi_simple_poll_quit(simple_poll);
1010
1715
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
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
}
1013
1722
}
1014
1723
}
1015
1724
}
1025
1734
const char *domain,
1026
1735
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1736
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1737
void *mc){
1738
if(b == NULL){
1739
return;
1740
}
1030
1741
1031
1742
/* Called whenever a new services becomes available on the LAN or
1032
1743
is removed from the LAN */
1039
1750
default:
1040
1751
case AVAHI_BROWSER_FAILURE:
1041
1752
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
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);
1045
1757
return;
1046
1758
1047
1759
case AVAHI_BROWSER_NEW:
1050
1762
the callback function is called the Avahi server will free the
1051
1763
resolver for us. */
1052
1764
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
1058
1773
break;
1059
1774
1060
1775
case AVAHI_BROWSER_REMOVE:
1063
1778
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1779
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1780
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1781
fprintf_plus(stderr, "No Mandos server found, still"
1782
" searching...\n");
1067
1783
}
1068
1784
break;
1069
1785
}
1070
1786
}
1071
1787
1072
/* Signal handler that stops main loop after sigterm has been called */
1788
/* Signal handler that stops main loop after SIGTERM */
1073
1789
static void handle_sigterm(int sig){
1074
1790
if(quit_now){
1075
1791
return;
1078
1794
signal_received = sig;
1079
1795
int old_errno = errno;
1080
1796
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1797
if(simple_poll != NULL){
1798
avahi_simple_poll_quit(simple_poll);
1083
1799
}
1084
1800
errno = old_errno;
1085
1801
}
1086
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
1087
1882
/*
1088
1883
* This function determines if a directory entry in /sys/class/net
1089
1884
* corresponds to an acceptable network device.
1090
1885
* (This function is passed to scandir(3) as a filter function.)
1091
1886
*/
1887
__attribute__((nonnull, warn_unused_result))
1092
1888
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1889
if(if_entry->d_name[0] == '.'){
1096
1890
return 0;
1097
1891
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
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;
1188
1904
}
1189
1905
return 1;
1190
1906
}
1191
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))
1192
1943
int notdotentries(const struct dirent *direntry){
1193
1944
/* Skip "." and ".." */
1194
1945
if(direntry->d_name[0] == '.'
1200
1951
return 1;
1201
1952
}
1202
1953
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
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){
1204
2012
int ret;
1205
2013
struct timespec now;
1206
2014
struct timespec waited_time;
1207
2015
intmax_t block_time;
1208
2016
1209
2017
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
2018
if(mc->current_server == NULL){
2019
if(debug){
2020
fprintf_plus(stderr, "Wait until first server is found."
2021
" No timeout!\n");
1213
2022
}
1214
2023
ret = avahi_simple_poll_iterate(s, -1);
1215
2024
} else {
1216
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
2025
if(debug){
2026
fprintf_plus(stderr, "Check current_server if we should run"
2027
" it, or wait\n");
1218
2028
}
1219
2029
/* the current time */
1220
2030
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
2034
}
1225
2035
/* Calculating in ms how long time between now and server
1226
2036
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1232
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
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);
1234
2051
}
1235
2052
1236
2053
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
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);
1241
2058
if(ret == 0){
1242
avahi_simple_poll_quit(mc.simple_poll);
2059
avahi_simple_poll_quit(s);
1243
2060
return 0;
1244
2061
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
2062
ret = clock_gettime(CLOCK_MONOTONIC,
2063
&mc->current_server->last_seen);
1246
2064
if(ret == -1){
1247
2065
perror_plus("clock_gettime");
1248
2066
return -1;
1249
2067
}
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
2068
mc->current_server = mc->current_server->next;
2069
block_time = 0; /* Call avahi to find new Mandos
2070
servers, but don't block */
1252
2071
}
1253
2072
1254
2073
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
2074
}
1256
2075
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
2076
if(ret > 0 or errno != EINTR){
1258
2077
return (ret != 1) ? ret : 0;
1259
2078
}
1260
2079
}
1261
2080
}
1262
2081
}
1263
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;
2466
}
2467
1264
2468
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 };
1265
2482
AvahiSServiceBrowser *sb = NULL;
1266
int error;
2483
error_t ret_errno;
1267
2484
int ret;
1268
2485
intmax_t tmpmax;
1269
2486
char *tmp;
1270
2487
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
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;
1279
2493
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
2494
const char *seckey = PATHDIR "/" SECKEY;
1281
2495
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;
1282
2502
1283
2503
bool gnutls_initialized = false;
1284
2504
bool gpgme_initialized = false;
1285
2505
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
2506
double retry_interval = 10; /* 10s between trying a server and
2507
retrying the same server again */
1287
2508
1288
2509
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
2510
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1329
2550
{ .name = "pubkey", .key = 'p',
1330
2551
.arg = "FILE",
1331
2552
.doc = "OpenPGP public key file base name",
1332
.group = 2 },
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 },
1333
2570
{ .name = "dh-bits", .key = 129,
1334
2571
.arg = "BITS",
1335
2572
.doc = "Bit length of the prime number used in the"
1336
2573
" Diffie-Hellman key exchange",
1337
2574
.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 },
1338
2580
{ .name = "priority", .key = 130,
1339
2581
.arg = "STRING",
1340
2582
.doc = "GnuTLS priority string for the TLS handshake",
1345
2587
.group = 2 },
1346
2588
{ .name = "retry", .key = 132,
1347
2589
.arg = "SECONDS",
1348
.doc = "Retry interval used when denied by the mandos server",
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",
1349
2595
.group = 2 },
1350
2596
/*
1351
2597
* These reproduce what we would get without ARGP_NO_HELP
1370
2616
connect_to = arg;
1371
2617
break;
1372
2618
case 'i': /* --interface */
1373
interface = arg;
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
}
1374
2624
break;
1375
2625
case 's': /* --seckey */
1376
2626
seckey = arg;
1378
2628
case 'p': /* --pubkey */
1379
2629
pubkey = arg;
1380
2630
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;
1381
2641
case 129: /* --dh-bits */
1382
2642
errno = 0;
1383
2643
tmpmax = strtoimax(arg, &tmp, 10);
1387
2647
}
1388
2648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1389
2649
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
1390
2653
case 130: /* --priority */
1391
2654
mc.priority = arg;
1392
2655
break;
1400
2663
errno = 0;
1401
2664
retry_interval = strtod(arg, &tmp);
1402
2665
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
2666
or (retry_interval * 1000) > INT_MAX
2667
or retry_interval < 0){
1404
2668
argp_error(state, "Bad retry interval");
1405
2669
}
1406
2670
break;
2671
case 133: /* --network-hook-dir */
2672
hookdir = arg;
2673
break;
1407
2674
/*
1408
2675
* These reproduce what we would get without ARGP_NO_HELP
1409
2676
*/
1411
2678
argp_state_help(state, state->out_stream,
1412
2679
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1413
2680
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
1414
2682
case -3: /* --usage */
1415
2683
argp_state_help(state, state->out_stream,
1416
2684
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
1417
2686
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
2687
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1419
2688
exit(argp_err_exit_status);
1420
2689
break;
1421
2690
default:
1428
2697
.args_doc = "",
1429
2698
.doc = "Mandos client -- Get and decrypt"
1430
2699
" passwords from a Mandos server" };
1431
ret = argp_parse(&argp, argc, argv,
1432
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1433
switch(ret){
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
1434
2703
case 0:
1435
2704
break;
1436
2705
case ENOMEM:
1437
2706
default:
1438
errno = ret;
2707
errno = ret_errno;
1439
2708
perror_plus("argp_parse");
1440
2709
exitcode = EX_OSERR;
1441
2710
goto end;
1445
2714
}
1446
2715
}
1447
2716
2717
{
2718
/* Work around Debian bug #633582:
2719
<https://bugs.debian.org/633582> */
2720
2721
/* Re-raise privileges */
2722
ret = raise_privileges();
2723
if(ret != 0){
2724
errno = ret;
2725
perror_plus("Failed to raise privileges");
2726
} else {
2727
struct stat st;
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
/* Lower privileges */
2794
ret = lower_privileges();
2795
if(ret != 0){
2796
errno = ret;
2797
perror_plus("Failed to lower privileges");
2798
}
2799
}
2800
}
2801
2802
/* Remove invalid interface names (except "none") */
2803
{
2804
char *interface = NULL;
2805
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2806
interface))){
2807
if(strcmp(interface, "none") != 0
2808
and if_nametoindex(interface) == 0){
2809
if(interface[0] != '\0'){
2810
fprintf_plus(stderr, "Not using nonexisting interface"
2811
" \"%s\"\n", interface);
2812
}
2813
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2814
interface = NULL;
2815
}
2816
}
2817
}
2818
2819
/* Run network hooks */
2820
{
2821
if(mc.interfaces != NULL){
2822
interfaces_hooks = malloc(mc.interfaces_size);
2823
if(interfaces_hooks == NULL){
2824
perror_plus("malloc");
2825
goto end;
2826
}
2827
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2828
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2829
}
2830
run_network_hooks("start", interfaces_hooks != NULL ?
2831
interfaces_hooks : "", delay);
2832
}
2833
1448
2834
if(not debug){
1449
2835
avahi_set_log_function(empty_log);
1450
2836
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
1476
2837
1477
2838
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
2839
from the signal handler */
1479
2840
/* Initialize the pseudo-RNG for Avahi */
1480
2841
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2842
simple_poll = avahi_simple_poll_new();
2843
if(simple_poll == NULL){
2844
fprintf_plus(stderr,
2845
"Avahi: Failed to create simple poll object.\n");
1484
2846
exitcode = EX_UNAVAILABLE;
1485
2847
goto end;
1486
2848
}
1548
2910
}
1549
2911
}
1550
2912
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
1581
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
1601
}
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1604
if(ret == -1){
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
1622
}
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
2913
/* If no interfaces were specified, make a list */
2914
if(mc.interfaces == NULL){
2915
struct dirent **direntries = NULL;
2916
/* Look for any good interfaces */
2917
ret = scandir(sys_class_net, &direntries, good_interface,
2918
alphasort);
2919
if(ret >= 1){
2920
/* Add all found interfaces to interfaces list */
2921
for(int i = 0; i < ret; ++i){
2922
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2923
direntries[i]->d_name);
2924
if(ret_errno != 0){
2925
errno = ret_errno;
2926
perror_plus("argz_add");
2927
free(direntries[i]);
2928
continue;
2929
}
2930
if(debug){
2931
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2932
direntries[i]->d_name);
2933
}
2934
free(direntries[i]);
2935
}
2936
free(direntries);
2937
} else {
2938
if(ret == 0){
2939
free(direntries);
2940
}
2941
fprintf_plus(stderr, "Could not find a network interface\n");
2942
exitcode = EXIT_FAILURE;
2943
goto end;
2944
}
2945
}
2946
2947
/* Bring up interfaces which are down, and remove any "none"s */
2948
{
2949
char *interface = NULL;
2950
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2951
interface))){
2952
/* If interface name is "none", stop bringing up interfaces.
2953
Also remove all instances of "none" from the list */
2954
if(strcmp(interface, "none") == 0){
2955
argz_delete(&mc.interfaces, &mc.interfaces_size,
2956
interface);
2957
interface = NULL;
2958
while((interface = argz_next(mc.interfaces,
2959
mc.interfaces_size, interface))){
2960
if(strcmp(interface, "none") == 0){
2961
argz_delete(&mc.interfaces, &mc.interfaces_size,
2962
interface);
2963
interface = NULL;
1636
2964
}
1637
2965
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1654
2966
break;
1655
2967
}
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
2968
bool interface_was_up = interface_is_up(interface);
2969
errno = bring_up_interface(interface, delay);
2970
if(not interface_was_up){
2971
if(errno != 0){
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2974
} else {
2975
errno = argz_add(&interfaces_to_take_down,
2976
&interfaces_to_take_down_size,
2977
interface);
2978
if(errno != 0){
2979
perror_plus("argz_add");
2980
}
2981
}
2982
}
2983
}
2984
if(debug and (interfaces_to_take_down == NULL)){
2985
fprintf_plus(stderr, "No interfaces were brought up\n");
2986
}
2987
}
2988
2989
/* If we only got one interface, explicitly use only that one */
2990
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2991
if(debug){
2992
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2993
mc.interfaces);
2994
}
2995
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1693
2996
}
1694
2997
1695
2998
if(quit_now){
1696
2999
goto end;
1697
3000
}
1698
3001
1699
ret = init_gnutls_global(pubkey, seckey);
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3006
#else
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3008
#endif
1700
3009
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
3010
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
3011
exitcode = EX_UNAVAILABLE;
1703
3012
goto end;
1704
3013
} else {
1709
3018
goto end;
1710
3019
}
1711
3020
1712
if(mkdtemp(tempdir) == NULL){
3021
/* Try /run/tmp before /tmp */
3022
tempdir = mkdtemp(run_tempdir);
3023
if(tempdir == NULL and errno == ENOENT){
3024
if(debug){
3025
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3026
run_tempdir, old_tempdir);
3027
}
3028
tempdir = mkdtemp(old_tempdir);
3029
}
3030
if(tempdir == NULL){
1713
3031
perror_plus("mkdtemp");
1714
3032
goto end;
1715
3033
}
1716
tempdir_created = true;
1717
3034
1718
3035
if(quit_now){
1719
3036
goto end;
1720
3037
}
1721
3038
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
3039
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3040
fprintf_plus(stderr, "init_gpgme failed\n");
1724
3041
exitcode = EX_UNAVAILABLE;
1725
3042
goto end;
1726
3043
} else {
1735
3052
/* Connect directly, do not use Zeroconf */
1736
3053
/* (Mainly meant for debugging) */
1737
3054
char *address = strrchr(connect_to, ':');
3055
1738
3056
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
3057
fprintf_plus(stderr, "No colon in address\n");
1740
3058
exitcode = EX_USAGE;
1741
3059
goto end;
1742
3060
}
1745
3063
goto end;
1746
3064
}
1747
3065
1748
uint16_t port;
3066
in_port_t port;
1749
3067
errno = 0;
1750
3068
tmpmax = strtoimax(address+1, &tmp, 10);
1751
3069
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
3070
or tmpmax != (in_port_t)tmpmax){
3071
fprintf_plus(stderr, "Bad port number\n");
1754
3072
exitcode = EX_USAGE;
1755
3073
goto end;
1756
3074
}
1757
3075
1758
3076
if(quit_now){
1759
3077
goto end;
1760
3078
}
1761
3079
1762
port = (uint16_t)tmpmax;
3080
port = (in_port_t)tmpmax;
1763
3081
*address = '\0';
1764
address = connect_to;
1765
3082
/* Colon in address indicates IPv6 */
1766
3083
int af;
1767
if(strchr(address, ':') != NULL){
3084
if(strchr(connect_to, ':') != NULL){
1768
3085
af = AF_INET6;
3086
/* Accept [] around IPv6 address - see RFC 5952 */
3087
if(connect_to[0] == '[' and address[-1] == ']')
3088
{
3089
connect_to++;
3090
address[-1] = '\0';
3091
}
1769
3092
} else {
1770
3093
af = AF_INET;
1771
3094
}
3095
address = connect_to;
1772
3096
1773
3097
if(quit_now){
1774
3098
goto end;
1775
3099
}
1776
3100
1777
3101
while(not quit_now){
1778
ret = start_mandos_communication(address, port, if_index, af);
3102
ret = start_mandos_communication(address, port, if_index, af,
3103
&mc);
1779
3104
if(quit_now or ret == 0){
1780
3105
break;
1781
3106
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
1785
if (not quit_now){
3107
if(debug){
3108
fprintf_plus(stderr, "Retrying in %d seconds\n",
3109
(int)retry_interval);
3110
}
3111
sleep((unsigned int)retry_interval);
3112
}
3113
3114
if(not quit_now){
1786
3115
exitcode = EXIT_SUCCESS;
1787
3116
}
1788
3117
1789
3118
goto end;
1790
3119
}
1791
3120
1803
3132
config.publish_domain = 0;
1804
3133
1805
3134
/* Allocate a new server */
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
3135
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3136
&config, NULL, NULL, &ret);
1809
3137
1810
3138
/* Free the Avahi configuration data */
1811
3139
avahi_server_config_free(&config);
1813
3141
1814
3142
/* Check if creating the Avahi server object succeeded */
1815
3143
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
3144
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3145
avahi_strerror(ret));
1818
3146
exitcode = EX_UNAVAILABLE;
1819
3147
goto end;
1820
3148
}
1826
3154
/* Create the Avahi service browser */
1827
3155
sb = avahi_s_service_browser_new(mc.server, if_index,
1828
3156
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
NULL, 0, browse_callback, NULL);
3157
NULL, 0, browse_callback,
3158
(void *)&mc);
1830
3159
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
3160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3161
avahi_strerror(avahi_server_errno(mc.server)));
1833
3162
exitcode = EX_UNAVAILABLE;
1834
3163
goto end;
1835
3164
}
1841
3170
/* Run the main loop */
1842
3171
1843
3172
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
3173
fprintf_plus(stderr, "Starting Avahi loop search\n");
1845
3174
}
1846
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
3175
3176
ret = avahi_loop_with_timeout(simple_poll,
3177
(int)(retry_interval * 1000), &mc);
1848
3178
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
3179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3180
(ret == 0) ? "successfully" : "with error");
1851
3181
}
1852
3182
1853
3183
end:
1854
3184
1855
3185
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3190
} else {
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3192
}
1857
3193
}
1858
3194
1859
3195
/* Cleanup things */
3196
free(mc.interfaces);
3197
1860
3198
if(sb != NULL)
1861
3199
avahi_s_service_browser_free(sb);
1862
3200
1863
3201
if(mc.server != NULL)
1864
3202
avahi_server_free(mc.server);
1865
3203
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
3204
if(simple_poll != NULL)
3205
avahi_simple_poll_free(simple_poll);
1868
3206
1869
3207
if(gnutls_initialized){
1870
3208
gnutls_certificate_free_credentials(mc.cred);
1871
gnutls_global_deinit();
1872
3209
gnutls_dh_params_deinit(mc.dh_params);
1873
3210
}
1874
3211
1875
3212
if(gpgme_initialized){
1876
3213
gpgme_release(mc.ctx);
1877
3214
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
3215
3216
/* Cleans up the circular linked list of Mandos servers the client
3217
has seen */
1880
3218
if(mc.current_server != NULL){
1881
3219
mc.current_server->prev->next = NULL;
1882
3220
while(mc.current_server != NULL){
1883
3221
server *next = mc.current_server->next;
3222
#ifdef __GNUC__
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3225
#endif
3226
free((char *)(mc.current_server->ip));
3227
#ifdef __GNUC__
3228
#pragma GCC diagnostic pop
3229
#endif
1884
3230
free(mc.current_server);
1885
3231
mc.current_server = next;
1886
3232
}
1887
3233
}
1888
3234
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
1896
}
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1906
}
1907
}
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
1918
}
3235
/* Re-raise privileges */
3236
{
3237
ret = raise_privileges();
3238
if(ret != 0){
3239
errno = ret;
3240
perror_plus("Failed to raise privileges");
3241
} else {
3242
3243
/* Run network hooks */
3244
run_network_hooks("stop", interfaces_hooks != NULL ?
3245
interfaces_hooks : "", delay);
3246
3247
/* Take down the network interfaces which were brought up */
3248
{
3249
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3252
interface))){
3253
ret = take_down_interface(interface);
3254
if(ret != 0){
3255
errno = ret;
3256
perror_plus("Failed to take down interface");
3257
}
3258
}
3259
if(debug and (interfaces_to_take_down == NULL)){
3260
fprintf_plus(stderr, "No interfaces needed to be taken"
3261
" down\n");
3262
}
3263
}
3264
}
3265
3266
ret = lower_privileges_permanently();
3267
if(ret != 0){
3268
errno = ret;
3269
perror_plus("Failed to lower privileges permanently");
3270
}
3271
}
3272
3273
free(interfaces_to_take_down);
3274
free(interfaces_hooks);
3275
3276
void clean_dir_at(int base, const char * const dirname,
3277
uintmax_t level){
3278
struct dirent **direntries = NULL;
3279
int dret;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3281
O_RDONLY
3282
| O_NOFOLLOW
3283
| O_DIRECTORY
3284
| O_PATH));
3285
if(dir_fd == -1){
3286
perror_plus("open");
3287
return;
3288
}
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
3292
for(int i = 0; i < numentries; i++){
3293
if(debug){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3296
}
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3298
if(dret == -1){
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3301
AT_REMOVEDIR);
3302
}
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3308
dret = 0;
3309
}
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3313
}
3314
}
3315
free(direntries[i]);
3316
}
3317
3318
/* need to clean even if 0 because man page doesn't specify */
3319
free(direntries);
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3323
}
3324
} else {
3325
perror_plus("scandirat");
3326
}
3327
close(dir_fd);
1919
3328
}
1920
3329
1921
3330
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
1923
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1931
direntry->d_name);
1932
if(ret < 0){
1933
perror_plus("asprintf");
1934
continue;
1935
}
1936
ret = remove(fullname);
1937
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
1940
}
1941
free(fullname);
1942
}
1943
}
1944
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1946
free(direntries);
1947
if (ret == -1){
1948
perror_plus("scandir");
1949
}
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");
1953
}
3331
if(tempdir != NULL){
3332
clean_dir_at(-1, tempdir, 0);
1954
3333
}
1955
3334
1956
3335
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0