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- Committer: Teddy Hogeborn
- Date: 2009-09-08 04:41:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908044137-4cxubotvn4etoxxl
* plugins.d/mandos-client.c (main): Bug fix: Check result of setgid().
Bug fix: If taking down network
interface, do not drop privileges
completely; save them and reassert
privileges when needed.
Bug fix: If taking down network
interface, do not drop privileges
completely; save them and reassert
privileges when needed.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2019 Teddy Hogeborn
13
* Copyright © 2008-2019 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
68
SIOCSIFFLAGS, if_indextoname(),
76
69
if_nametoindex(), IF_NAMESIZE */
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
90
82
#include <signal.h> /* sigemptyset(), sigaddset(),
91
83
sigaction(), SIGTERM, sig_atomic_t,
92
84
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
85
105
86
#ifdef __linux__
106
87
#include <sys/klog.h> /* klogctl() */
123
104
gnutls_*
124
105
init_gnutls_session(),
125
106
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
107
#include <gnutls/openpgp.h>
128
/* gnutls_certificate_set_openpgp_key_file(),
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
135
110
136
111
/* GPGME */
137
112
#include <gpgme.h> /* All GPGME types, constants and
145
120
#define PATHDIR "/conf/conf.d/mandos"
146
121
#define SECKEY "seckey.txt"
147
122
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
151
123
152
124
bool debug = false;
153
125
static const char mandos_protocol_version[] = "1";
154
126
const char *argp_program_version = "mandos-client " VERSION;
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
156
static const char sys_class_net[] = "/sys/class/net";
157
char *connect_to = NULL;
158
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
uid_t uid = 65534;
161
gid_t gid = 65534;
162
163
/* Doubly linked list that need to be circularly linked when used */
164
typedef struct server{
165
const char *ip;
166
in_port_t port;
167
AvahiIfIndex if_index;
168
int af;
169
struct timespec last_seen;
170
struct server *next;
171
struct server *prev;
172
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
173
128
174
129
/* Used for passing in values through the Avahi callback functions */
175
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
176
132
AvahiServer *server;
177
133
gnutls_certificate_credentials_t cred;
178
134
unsigned int dh_bits;
179
135
gnutls_dh_params_t dh_params;
180
136
const char *priority;
181
137
gpgme_ctx_t ctx;
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
185
138
} mandos_context;
186
139
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
189
190
sig_atomic_t quit_now = 0;
191
int signal_received = 0;
192
193
/* Function to use when printing errors */
194
void perror_plus(const char *print_text){
195
int e = errno;
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
198
errno = e;
199
perror(print_text);
200
}
201
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
203
int fprintf_plus(FILE *stream, const char *format, ...){
204
va_list ap;
205
va_start (ap, format);
206
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
211
144
212
145
/*
213
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
214
147
* bytes. "buffer_capacity" is how much is currently allocated,
215
148
* "buffer_length" is how much is already used.
216
149
*/
217
__attribute__((nonnull, warn_unused_result))
218
150
size_t incbuffer(char **buffer, size_t buffer_length,
219
size_t buffer_capacity){
151
size_t buffer_capacity){
220
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
227
155
return 0;
228
156
}
229
*buffer = new_buf;
230
157
buffer_capacity += BUFFER_SIZE;
231
158
}
232
159
return buffer_capacity;
233
160
}
234
161
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
int af, server **current_server){
239
int ret;
240
server *new_server = malloc(sizeof(server));
241
if(new_server == NULL){
242
perror_plus("malloc");
243
return false;
244
}
245
*new_server = (server){ .ip = strdup(ip),
246
.port = port,
247
.if_index = if_index,
248
.af = af };
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
266
return false;
267
}
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
273
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
279
}
280
return true;
281
}
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
335
162
/*
336
163
* Initialize GPGME.
337
164
*/
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
343
167
gpgme_error_t rc;
344
168
gpgme_engine_info_t engine_info;
345
169
170
346
171
/*
347
172
* Helper function to insert pub and seckey to the engine keyring.
348
173
*/
349
bool import_key(const char * const filename){
174
bool import_key(const char *filename){
350
175
int ret;
351
176
int fd;
352
177
gpgme_data_t pgp_data;
353
178
354
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
355
180
if(fd == -1){
356
perror_plus("open");
181
perror("open");
357
182
return false;
358
183
}
359
184
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
402
}
403
ret = lower_privileges();
404
if(ret != 0){
405
errno = ret;
406
perror_plus("Failed to lower privileges");
407
}
408
} while(false);
409
410
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
186
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
414
189
return false;
415
190
}
416
191
417
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
418
193
if(rc != GPG_ERR_NO_ERROR){
419
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
420
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
421
196
return false;
422
197
}
423
{
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
fprintf_plus(stderr,
431
"The total number of considered keys: %d\n",
432
import_result->considered);
433
fprintf_plus(stderr,
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
436
fprintf_plus(stderr,
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
451
fprintf_plus(stderr,
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
454
fprintf_plus(stderr,
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
457
fprintf_plus(stderr,
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
467
import_status->fpr);
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
472
}
473
fprintf_plus(stderr, "Key status:\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
486
fprintf_plus(stderr,
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
490
fprintf_plus(stderr,
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
494
}
495
return false;
496
}
497
}
498
198
499
ret = close(fd);
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
200
if(ret == -1){
501
perror_plus("close");
201
perror("close");
502
202
}
503
203
gpgme_data_release(pgp_data);
504
204
return true;
505
205
}
506
206
507
207
if(debug){
508
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
509
209
}
510
210
511
211
/* Init GPGME */
512
212
gpgme_check_version(NULL);
513
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
514
214
if(rc != GPG_ERR_NO_ERROR){
515
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
516
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
517
217
return false;
518
218
}
519
219
520
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
521
221
rc = gpgme_get_engine_info(&engine_info);
522
222
if(rc != GPG_ERR_NO_ERROR){
523
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
524
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
525
225
return false;
526
226
}
527
227
while(engine_info != NULL){
533
233
engine_info = engine_info->next;
534
234
}
535
235
if(engine_info == NULL){
536
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
537
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
538
237
return false;
539
238
}
540
239
541
240
/* Create new GPGME "context" */
542
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
543
242
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
546
245
return false;
547
246
}
548
247
557
256
* Decrypt OpenPGP data.
558
257
* Returns -1 on error
559
258
*/
560
__attribute__((nonnull, warn_unused_result))
561
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
562
260
size_t crypto_size,
563
char **plaintext,
564
mandos_context *mc){
261
char **plaintext){
565
262
gpgme_data_t dh_crypto, dh_plain;
566
263
gpgme_error_t rc;
567
264
ssize_t ret;
569
266
ssize_t plaintext_length = 0;
570
267
571
268
if(debug){
572
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
573
270
}
574
271
575
272
/* Create new GPGME data buffer from memory cryptotext */
576
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
577
274
0);
578
275
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
581
278
return -1;
582
279
}
583
280
584
281
/* Create new empty GPGME data buffer for the plaintext */
585
282
rc = gpgme_data_new(&dh_plain);
586
283
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
588
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
589
286
gpgme_data_release(dh_crypto);
590
287
return -1;
591
288
}
592
289
593
290
/* Decrypt data from the cryptotext data buffer to the plaintext
594
291
data buffer */
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
596
293
if(rc != GPG_ERR_NO_ERROR){
597
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
598
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
599
296
plaintext_length = -1;
600
297
if(debug){
601
298
gpgme_decrypt_result_t result;
602
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
603
300
if(result == NULL){
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
605
302
} else {
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
609
}
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
612
307
if(result->file_name != NULL){
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
614
309
}
615
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
617
r = r->next){
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
621
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
623
320
}
624
321
}
625
322
}
627
324
}
628
325
629
326
if(debug){
630
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
631
328
}
632
329
633
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
634
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
635
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
636
333
plaintext_length = -1;
637
334
goto decrypt_end;
638
335
}
640
337
*plaintext = NULL;
641
338
while(true){
642
339
plaintext_capacity = incbuffer(plaintext,
643
(size_t)plaintext_length,
644
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
645
342
if(plaintext_capacity == 0){
646
perror_plus("incbuffer");
647
plaintext_length = -1;
648
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
649
346
}
650
347
651
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
656
353
break;
657
354
}
658
355
if(ret < 0){
659
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
660
357
plaintext_length = -1;
661
358
goto decrypt_end;
662
359
}
664
361
}
665
362
666
363
if(debug){
667
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
668
365
for(ssize_t i = 0; i < plaintext_length; i++){
669
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
670
367
}
681
378
return plaintext_length;
682
379
}
683
380
684
__attribute__((warn_unused_result, const))
685
static const char *safe_string(const char *str){
686
if(str == NULL)
687
return "(unknown)";
688
return str;
689
}
690
691
__attribute__((warn_unused_result))
692
static const char *safer_gnutls_strerror(int value){
693
const char *ret = gnutls_strerror(value);
694
return safe_string(ret);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
385
ret = "(unknown)";
386
return ret;
695
387
}
696
388
697
389
/* GnuTLS log function callback */
698
__attribute__((nonnull))
699
390
static void debuggnutls(__attribute__((unused)) int level,
700
391
const char* string){
701
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
702
393
}
703
394
704
__attribute__((nonnull(1, 2, 4), warn_unused_result))
705
395
static int init_gnutls_global(const char *pubkeyfilename,
706
const char *seckeyfilename,
707
const char *dhparamsfilename,
708
mandos_context *mc){
396
const char *seckeyfilename){
709
397
int ret;
710
398
711
399
if(debug){
712
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
401
}
402
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
407
return -1;
713
408
}
714
409
715
410
if(debug){
721
416
}
722
417
723
418
/* OpenPGP credentials */
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
725
420
if(ret != GNUTLS_E_SUCCESS){
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
728
427
return -1;
729
428
}
730
429
731
430
if(debug){
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
734
pubkeyfilename,
735
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
736
434
}
737
435
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
742
NULL, /* pass */
743
/* key_usage */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
NULL, /* names */
746
0, /* names_length */
747
/* privkey_flags */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
751
436
ret = gnutls_certificate_set_openpgp_key_file
752
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
753
438
GNUTLS_OPENPGP_FMT_BASE64);
754
#else
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
#endif
757
439
if(ret != GNUTLS_E_SUCCESS){
758
fprintf_plus(stderr,
759
"Error[%d] while reading the key pair ('%s',"
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
763
445
goto globalfail;
764
446
}
765
447
766
448
/* GnuTLS server initialization */
767
ret = gnutls_dh_params_init(&mc->dh_params);
768
if(ret != GNUTLS_E_SUCCESS){
769
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
770
" initialization: %s\n",
771
safer_gnutls_strerror(ret));
772
goto globalfail;
773
}
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
do {
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
779
if(dhpfile == -1){
780
perror_plus("open");
781
dhparamsfilename = NULL;
782
break;
783
}
784
size_t params_capacity = 0;
785
while(true){
786
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params.size,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
791
free(params.data);
792
params.data = NULL;
793
dhparamsfilename = NULL;
794
break;
795
}
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
798
BUFFER_SIZE);
799
/* EOF */
800
if(bytes_read == 0){
801
break;
802
}
803
/* check bytes_read for failure */
804
if(bytes_read < 0){
805
perror_plus("read");
806
free(params.data);
807
params.data = NULL;
808
dhparamsfilename = NULL;
809
break;
810
}
811
params.size += (unsigned int)bytes_read;
812
}
813
ret = close(dhpfile);
814
if(ret == -1){
815
perror_plus("close");
816
}
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
819
}
820
if(dhparamsfilename == NULL){
821
break;
822
}
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
830
}
831
free(params.data);
832
} while(false);
833
}
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
do {
841
int secfile = open(seckeyfilename, O_RDONLY);
842
if(secfile == -1){
843
perror_plus("open");
844
break;
845
}
846
size_t buffer_capacity = 0;
847
while(true){
848
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer.size,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
853
free(buffer.data);
854
buffer.data = NULL;
855
break;
856
}
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
859
BUFFER_SIZE);
860
/* EOF */
861
if(bytes_read == 0){
862
break;
863
}
864
/* check bytes_read for failure */
865
if(bytes_read < 0){
866
perror_plus("read");
867
free(buffer.data);
868
buffer.data = NULL;
869
break;
870
}
871
buffer.size += (unsigned int)bytes_read;
872
}
873
close(secfile);
874
} while(false);
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
878
{
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
" structure: %s",
884
safer_gnutls_strerror(ret));
885
free(buffer.data);
886
buffer.data = NULL;
887
} else {
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
893
privkey = NULL;
894
}
895
free(buffer.data);
896
buffer.data = NULL;
897
if(privkey != NULL){
898
/* Use private key to suggest an appropriate
899
sec_param */
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
902
if(debug){
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
906
(sec_param)));
907
}
908
}
909
}
910
}
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
if(debug){
915
fprintf_plus(stderr, "Falling back to security parameter"
916
" \"%s\"\n",
917
safe_string(gnutls_sec_param_get_name
918
(sec_param)));
919
}
920
}
921
}
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
923
if(uret != 0){
924
mc->dh_bits = uret;
925
if(debug){
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
929
(sec_param)),
930
mc->dh_bits);
931
}
932
} else {
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
936
(sec_param)),
937
safer_gnutls_strerror(ret));
938
goto globalfail;
939
}
940
#endif
941
} else { /* dh_bits != 0 */
942
if(debug){
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
944
mc->dh_bits);
945
}
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
951
goto globalfail;
952
}
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
954
}
955
}
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
956
463
957
464
return 0;
958
465
959
466
globalfail:
960
467
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
963
471
return -1;
964
472
}
965
473
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
968
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
969
475
int ret;
970
476
/* GnuTLS session creation */
971
do {
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
974
| GNUTLS_NO_TICKETS
975
#endif
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
978
#endif
979
));
980
if(quit_now){
981
return -1;
982
}
983
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
984
478
if(ret != GNUTLS_E_SUCCESS){
985
fprintf_plus(stderr,
986
"Error in GnuTLS session initialization: %s\n",
987
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
988
481
}
989
482
990
483
{
991
484
const char *err;
992
do {
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
994
if(quit_now){
995
gnutls_deinit(*session);
996
return -1;
997
}
998
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
999
486
if(ret != GNUTLS_E_SUCCESS){
1000
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1001
fprintf_plus(stderr, "GnuTLS error: %s\n",
1002
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
1003
490
gnutls_deinit(*session);
1004
491
return -1;
1005
492
}
1006
493
}
1007
494
1008
do {
1009
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1010
mc->cred);
1011
if(quit_now){
1012
gnutls_deinit(*session);
1013
return -1;
1014
}
1015
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
1016
497
if(ret != GNUTLS_E_SUCCESS){
1017
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1018
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
1019
500
gnutls_deinit(*session);
1020
501
return -1;
1021
502
}
1022
503
1023
504
/* ignore client certificate if any. */
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
507
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
1025
509
1026
510
return 0;
1027
511
}
1030
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
515
__attribute__((unused)) const char *txt){}
1032
516
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1038
int ret;
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1045
if(debug){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1048
}
1049
return false;
1050
}
1051
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1055
return false;
1056
}
1057
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
if(devnull == -1){
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1061
return false;
1062
}
1063
pid_t pid = fork();
1064
if(pid == 0){
1065
/* Child */
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1068
if(errno != 0){
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1071
} else {
1072
/* Set group */
1073
errno = 0;
1074
ret = setgid(0);
1075
if(ret == -1){
1076
perror_plus("setgid");
1077
close(devnull);
1078
_exit(EX_NOPERM);
1079
}
1080
/* Reset supplementary groups */
1081
errno = 0;
1082
ret = setgroups(0, NULL);
1083
if(ret == -1){
1084
perror_plus("setgroups");
1085
close(devnull);
1086
_exit(EX_NOPERM);
1087
}
1088
}
1089
ret = dup2(devnull, STDIN_FILENO);
1090
if(ret == -1){
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1092
close(devnull);
1093
_exit(EX_OSERR);
1094
}
1095
ret = close(devnull);
1096
if(ret == -1){
1097
perror_plus("close");
1098
}
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1100
if(ret == -1){
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1102
_exit(EX_OSERR);
1103
}
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1105
O_RDONLY
1106
| O_DIRECTORY
1107
| O_PATH
1108
| O_CLOEXEC));
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1112
}
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1114
helper, O_RDONLY));
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1119
}
1120
close(helperdir_fd);
1121
#ifdef __GNUC__
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1124
#endif
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1128
environ) == -1){
1129
#ifdef __GNUC__
1130
#pragma GCC diagnostic pop
1131
#endif
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1134
}
1135
}
1136
if(pid == -1){
1137
perror_plus("fork");
1138
close(devnull);
1139
return false;
1140
}
1141
ret = close(devnull);
1142
if(ret == -1){
1143
perror_plus("close");
1144
}
1145
int status;
1146
pid_t pret = -1;
1147
errno = 0;
1148
do {
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1156
}
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1159
}
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1162
" helper program");
1163
}
1164
return false;
1165
}
1166
} while(pret == -1 and errno == EINTR);
1167
if(pret == -1){
1168
perror_plus("waitpid");
1169
return false;
1170
}
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1175
return false;
1176
}
1177
return true;
1178
}
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1182
return false;
1183
}
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1185
return false;
1186
}
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1191
if(debug){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1193
}
1194
return add_delete_local_route(true, address, if_index);
1195
}
1196
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1200
if(debug){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1202
}
1203
return add_delete_local_route(false, address, if_index);
1204
}
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
1205
519
1206
520
/* Called when a Mandos server is found */
1207
__attribute__((nonnull, warn_unused_result))
1208
static int start_mandos_communication(const char *ip, in_port_t port,
521
static int start_mandos_communication(const char *ip, uint16_t port,
1209
522
AvahiIfIndex if_index,
1210
int af, mandos_context *mc){
523
int af){
1211
524
int ret, tcp_sd = -1;
1212
525
ssize_t sret;
1213
struct sockaddr_storage to;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
1214
530
char *buffer = NULL;
1215
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
1216
532
size_t buffer_length = 0;
1217
533
size_t buffer_capacity = 0;
1218
534
size_t written;
1219
int retval = -1;
535
int retval = 0;
1220
536
gnutls_session_t session;
1221
537
int pf; /* Protocol family */
1222
bool route_added = false;
1223
1224
errno = 0;
1225
538
1226
539
if(quit_now){
1227
errno = EINTR;
1228
540
return -1;
1229
541
}
1230
542
1236
548
pf = PF_INET;
1237
549
break;
1238
550
default:
1239
fprintf_plus(stderr, "Bad address family: %d\n", af);
1240
errno = EINVAL;
551
fprintf(stderr, "Bad address family: %d\n", af);
1241
552
return -1;
1242
553
}
1243
554
1244
/* If the interface is specified and we have a list of interfaces */
1245
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1246
/* Check if the interface is one of the interfaces we are using */
1247
bool match = false;
1248
{
1249
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1252
interface))){
1253
if(if_nametoindex(interface) == (unsigned int)if_index){
1254
match = true;
1255
break;
1256
}
1257
}
1258
}
1259
if(not match){
1260
/* This interface does not match any in the list, so we don't
1261
connect to the server */
1262
if(debug){
1263
char interface[IF_NAMESIZE];
1264
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1265
perror_plus("if_indextoname");
1266
} else {
1267
fprintf_plus(stderr, "Skipping server on non-used interface"
1268
" \"%s\"\n",
1269
if_indextoname((unsigned int)if_index,
1270
interface));
1271
}
1272
}
1273
return -1;
1274
}
1275
}
1276
1277
ret = init_gnutls_session(&session, mc);
555
ret = init_gnutls_session(&session);
1278
556
if(ret != 0){
1279
557
return -1;
1280
558
}
1281
559
1282
560
if(debug){
1283
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1284
PRIuMAX "\n", ip, (uintmax_t)port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
562
"\n", ip, port);
1285
563
}
1286
564
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
1288
566
if(tcp_sd < 0){
1289
int e = errno;
1290
perror_plus("socket");
1291
errno = e;
567
perror("socket");
568
retval = -1;
1292
569
goto mandos_end;
1293
570
}
1294
571
1295
572
if(quit_now){
1296
errno = EINTR;
1297
573
goto mandos_end;
1298
574
}
1299
575
576
memset(&to, 0, sizeof(to));
1300
577
if(af == AF_INET6){
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1304
580
} else { /* IPv4 */
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
1308
583
}
1309
584
if(ret < 0 ){
1310
int e = errno;
1311
perror_plus("inet_pton");
1312
errno = e;
585
perror("inet_pton");
586
retval = -1;
1313
587
goto mandos_end;
1314
588
}
1315
589
if(ret == 0){
1316
int e = errno;
1317
fprintf_plus(stderr, "Bad address: %s\n", ip);
1318
errno = e;
590
fprintf(stderr, "Bad address: %s\n", ip);
591
retval = -1;
1319
592
goto mandos_end;
1320
593
}
1321
594
if(af == AF_INET6){
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
1325
602
if(if_index == AVAHI_IF_UNSPEC){
1326
fprintf_plus(stderr, "An IPv6 link-local address is"
1327
" incomplete without a network interface\n");
1328
errno = EINVAL;
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
1329
606
goto mandos_end;
1330
607
}
1331
608
/* Set the network interface number as scope */
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
609
to.in6.sin6_scope_id = (uint32_t)if_index;
1333
610
}
1334
611
} else {
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
612
to.in.sin_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
1336
615
}
1337
616
1338
617
if(quit_now){
1339
errno = EINTR;
1340
618
goto mandos_end;
1341
619
}
1342
620
1344
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1345
623
char interface[IF_NAMESIZE];
1346
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1347
perror_plus("if_indextoname");
625
perror("if_indextoname");
1348
626
} else {
1349
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1350
"\n", ip, interface, (uintmax_t)port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
1351
629
}
1352
630
} else {
1353
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1354
ip, (uintmax_t)port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
1355
633
}
1356
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1357
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1358
if(af == AF_INET6){
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
1361
addrstr, sizeof(addrstr), NULL, 0,
1362
NI_NUMERICHOST);
1363
} else {
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
1366
addrstr, sizeof(addrstr), NULL, 0,
1367
NI_NUMERICHOST);
1368
}
1369
if(ret == EAI_SYSTEM){
1370
perror_plus("getnameinfo");
1371
} else if(ret != 0) {
1372
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1373
} else if(strcmp(addrstr, ip) != 0){
1374
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1375
}
1376
}
1377
1378
if(quit_now){
1379
errno = EINTR;
1380
goto mandos_end;
1381
}
1382
1383
while(true){
1384
if(af == AF_INET6){
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1387
} else {
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1390
}
1391
if(ret < 0){
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1398
&to)->sin6_addr)))
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1409
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1413
*/
1414
if(debug){
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1416
" direct route\n");
1417
}
1418
int e = errno;
1419
route_added = add_local_route(ip, if_index);
1420
if(route_added){
1421
continue;
1422
}
1423
errno = e;
1424
}
1425
if(errno != ECONNREFUSED or debug){
1426
int e = errno;
1427
perror_plus("connect");
1428
errno = e;
1429
}
1430
goto mandos_end;
1431
}
1432
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
break;
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
if(pcret == NULL){
645
perror("inet_ntop");
646
} else {
647
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
649
}
650
}
651
}
652
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
662
if(ret < 0){
663
perror("connect");
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
1438
670
}
1439
671
1440
672
const char *out = mandos_protocol_version;
1442
674
while(true){
1443
675
size_t out_size = strlen(out);
1444
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1445
out_size - written));
677
out_size - written));
1446
678
if(ret == -1){
1447
int e = errno;
1448
perror_plus("write");
1449
errno = e;
679
perror("write");
680
retval = -1;
1450
681
goto mandos_end;
1451
682
}
1452
683
written += (size_t)ret;
1462
693
}
1463
694
1464
695
if(quit_now){
1465
errno = EINTR;
1466
696
goto mandos_end;
1467
697
}
1468
698
}
1469
699
1470
700
if(debug){
1471
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1472
702
}
1473
703
1474
704
if(quit_now){
1475
errno = EINTR;
1476
705
goto mandos_end;
1477
706
}
1478
707
1479
/* This casting via intptr_t is to eliminate warning about casting
1480
an int to a pointer type. This is exactly how the GnuTLS Guile
1481
function "set-session-transport-fd!" does it. */
1482
gnutls_transport_set_ptr(session,
1483
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1484
709
1485
710
if(quit_now){
1486
errno = EINTR;
1487
711
goto mandos_end;
1488
712
}
1489
713
1490
714
do {
1491
715
ret = gnutls_handshake(session);
1492
716
if(quit_now){
1493
errno = EINTR;
1494
717
goto mandos_end;
1495
718
}
1496
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1497
720
1498
721
if(ret != GNUTLS_E_SUCCESS){
1499
722
if(debug){
1500
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1501
724
gnutls_perror(ret);
1502
725
}
1503
errno = EPROTO;
726
retval = -1;
1504
727
goto mandos_end;
1505
728
}
1506
729
1507
730
/* Read OpenPGP packet that contains the wanted password */
1508
731
1509
732
if(debug){
1510
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1511
" %s\n", ip);
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
734
ip);
1512
735
}
1513
736
1514
737
while(true){
1515
738
1516
739
if(quit_now){
1517
errno = EINTR;
1518
740
goto mandos_end;
1519
741
}
1520
742
1521
743
buffer_capacity = incbuffer(&buffer, buffer_length,
1522
buffer_capacity);
744
buffer_capacity);
1523
745
if(buffer_capacity == 0){
1524
int e = errno;
1525
perror_plus("incbuffer");
1526
errno = e;
746
perror("incbuffer");
747
retval = -1;
1527
748
goto mandos_end;
1528
749
}
1529
750
1530
751
if(quit_now){
1531
errno = EINTR;
1532
752
goto mandos_end;
1533
753
}
1534
754
1547
767
ret = gnutls_handshake(session);
1548
768
1549
769
if(quit_now){
1550
errno = EINTR;
1551
770
goto mandos_end;
1552
771
}
1553
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1554
773
if(ret < 0){
1555
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1556
"***\n");
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1557
775
gnutls_perror(ret);
1558
errno = EPROTO;
776
retval = -1;
1559
777
goto mandos_end;
1560
778
}
1561
779
break;
1562
780
default:
1563
fprintf_plus(stderr, "Unknown error while reading data from"
1564
" encrypted session with Mandos server\n");
781
fprintf(stderr, "Unknown error while reading data from"
782
" encrypted session with Mandos server\n");
783
retval = -1;
1565
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1566
errno = EIO;
1567
785
goto mandos_end;
1568
786
}
1569
787
} else {
1572
790
}
1573
791
1574
792
if(debug){
1575
fprintf_plus(stderr, "Closing TLS session\n");
1576
}
1577
1578
if(quit_now){
1579
errno = EINTR;
1580
goto mandos_end;
1581
}
1582
1583
do {
1584
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1585
if(quit_now){
1586
errno = EINTR;
1587
goto mandos_end;
1588
}
1589
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
793
fprintf(stderr, "Closing TLS session\n");
794
}
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
1590
805
1591
806
if(buffer_length > 0){
1592
807
ssize_t decrypted_buffer_size;
1593
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1594
&decrypted_buffer, mc);
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
buffer_length,
810
&decrypted_buffer);
1595
811
if(decrypted_buffer_size >= 0){
1596
812
1597
clearerr(stdout);
1598
813
written = 0;
1599
814
while(written < (size_t) decrypted_buffer_size){
1600
815
if(quit_now){
1601
errno = EINTR;
1602
816
goto mandos_end;
1603
817
}
1604
818
1606
820
(size_t)decrypted_buffer_size - written,
1607
821
stdout);
1608
822
if(ret == 0 and ferror(stdout)){
1609
int e = errno;
1610
823
if(debug){
1611
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1612
strerror(errno));
824
fprintf(stderr, "Error writing encrypted data: %s\n",
825
strerror(errno));
1613
826
}
1614
errno = e;
1615
goto mandos_end;
827
retval = -1;
828
break;
1616
829
}
1617
830
written += (size_t)ret;
1618
831
}
1619
ret = fflush(stdout);
1620
if(ret != 0){
1621
int e = errno;
1622
if(debug){
1623
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1624
strerror(errno));
1625
}
1626
errno = e;
1627
goto mandos_end;
1628
}
1629
retval = 0;
832
free(decrypted_buffer);
833
} else {
834
retval = -1;
1630
835
}
836
} else {
837
retval = -1;
1631
838
}
1632
839
1633
840
/* Shutdown procedure */
1634
841
1635
842
mandos_end:
1636
{
1637
if(route_added){
1638
if(not delete_local_route(ip, if_index)){
1639
fprintf_plus(stderr, "Failed to delete local route to %s on"
1640
" interface %d", ip, if_index);
1641
}
1642
}
1643
int e = errno;
1644
free(decrypted_buffer);
1645
free(buffer);
1646
if(tcp_sd >= 0){
1647
ret = close(tcp_sd);
1648
}
1649
if(ret == -1){
1650
if(e == 0){
1651
e = errno;
1652
}
1653
perror_plus("close");
1654
}
1655
gnutls_deinit(session);
1656
errno = e;
1657
if(quit_now){
1658
errno = EINTR;
1659
retval = -1;
1660
}
843
free(buffer);
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
847
if(ret == -1){
848
perror("close");
849
}
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
1661
853
}
1662
854
return retval;
1663
855
}
1675
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
1676
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1677
869
flags,
1678
void *mc){
1679
if(r == NULL){
1680
return;
1681
}
870
AVAHI_GCC_UNUSED void* userdata){
871
assert(r);
1682
872
1683
873
/* Called whenever a service has been resolved successfully or
1684
874
timed out */
1685
875
1686
876
if(quit_now){
1687
avahi_s_service_resolver_free(r);
1688
877
return;
1689
878
}
1690
879
1691
880
switch(event){
1692
881
default:
1693
882
case AVAHI_RESOLVER_FAILURE:
1694
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1695
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1696
domain,
1697
avahi_strerror(avahi_server_errno
1698
(((mandos_context*)mc)->server)));
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
885
avahi_strerror(avahi_server_errno(mc.server)));
1699
886
break;
1700
887
1701
888
case AVAHI_RESOLVER_FOUND:
1703
890
char ip[AVAHI_ADDRESS_STR_MAX];
1704
891
avahi_address_snprint(ip, sizeof(ip), address);
1705
892
if(debug){
1706
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1707
PRIdMAX ") on port %" PRIu16 "\n", name,
1708
host_name, ip, (intmax_t)interface, port);
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
1709
896
}
1710
int ret = start_mandos_communication(ip, (in_port_t)port,
1711
interface,
1712
avahi_proto_to_af(proto),
1713
mc);
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
1714
899
if(ret == 0){
1715
avahi_simple_poll_quit(simple_poll);
1716
} else {
1717
if(not add_server(ip, (in_port_t)port, interface,
1718
avahi_proto_to_af(proto),
1719
&((mandos_context*)mc)->current_server)){
1720
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1721
" list\n", name);
1722
}
900
avahi_simple_poll_quit(mc.simple_poll);
1723
901
}
1724
902
}
1725
903
}
1735
913
const char *domain,
1736
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1737
915
flags,
1738
void *mc){
1739
if(b == NULL){
1740
return;
1741
}
916
AVAHI_GCC_UNUSED void* userdata){
917
assert(b);
1742
918
1743
919
/* Called whenever a new services becomes available on the LAN or
1744
920
is removed from the LAN */
1751
927
default:
1752
928
case AVAHI_BROWSER_FAILURE:
1753
929
1754
fprintf_plus(stderr, "(Avahi browser) %s\n",
1755
avahi_strerror(avahi_server_errno
1756
(((mandos_context*)mc)->server)));
1757
avahi_simple_poll_quit(simple_poll);
930
fprintf(stderr, "(Avahi browser) %s\n",
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
1758
933
return;
1759
934
1760
935
case AVAHI_BROWSER_NEW:
1763
938
the callback function is called the Avahi server will free the
1764
939
resolver for us. */
1765
940
1766
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1767
interface, protocol, name, type,
1768
domain, protocol, 0,
1769
resolve_callback, mc) == NULL)
1770
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1771
" %s\n", name,
1772
avahi_strerror(avahi_server_errno
1773
(((mandos_context*)mc)->server)));
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
945
name, avahi_strerror(avahi_server_errno(mc.server)));
1774
946
break;
1775
947
1776
948
case AVAHI_BROWSER_REMOVE:
1779
951
case AVAHI_BROWSER_ALL_FOR_NOW:
1780
952
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1781
953
if(debug){
1782
fprintf_plus(stderr, "No Mandos server found, still"
1783
" searching...\n");
954
fprintf(stderr, "No Mandos server found, still searching...\n");
1784
955
}
1785
956
break;
1786
957
}
1787
958
}
1788
959
1789
/* Signal handler that stops main loop after SIGTERM */
960
/* stop main loop after sigterm has been called */
1790
961
static void handle_sigterm(int sig){
1791
962
if(quit_now){
1792
963
return;
1794
965
quit_now = 1;
1795
966
signal_received = sig;
1796
967
int old_errno = errno;
1797
/* set main loop to exit */
1798
if(simple_poll != NULL){
1799
avahi_simple_poll_quit(simple_poll);
1800
}
1801
errno = old_errno;
1802
}
1803
1804
__attribute__((nonnull, warn_unused_result))
1805
bool get_flags(const char *ifname, struct ifreq *ifr){
1806
int ret;
1807
int old_errno;
1808
1809
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(s < 0){
1811
old_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return false;
1815
}
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1818
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1819
if(ret == -1){
1820
if(debug){
1821
old_errno = errno;
1822
perror_plus("ioctl SIOCGIFFLAGS");
1823
errno = old_errno;
1824
}
1825
if((close(s) == -1) and debug){
1826
old_errno = errno;
1827
perror_plus("close");
1828
errno = old_errno;
1829
}
1830
return false;
1831
}
1832
if((close(s) == -1) and debug){
1833
old_errno = errno;
1834
perror_plus("close");
1835
errno = old_errno;
1836
}
1837
return true;
1838
}
1839
1840
__attribute__((nonnull, warn_unused_result))
1841
bool good_flags(const char *ifname, const struct ifreq *ifr){
1842
1843
/* Reject the loopback device */
1844
if(ifr->ifr_flags & IFF_LOOPBACK){
1845
if(debug){
1846
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1847
ifname);
1848
}
1849
return false;
1850
}
1851
/* Accept point-to-point devices only if connect_to is specified */
1852
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1853
if(debug){
1854
fprintf_plus(stderr, "Accepting point-to-point interface"
1855
" \"%s\"\n", ifname);
1856
}
1857
return true;
1858
}
1859
/* Otherwise, reject non-broadcast-capable devices */
1860
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1861
if(debug){
1862
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1863
" \"%s\"\n", ifname);
1864
}
1865
return false;
1866
}
1867
/* Reject non-ARP interfaces (including dummy interfaces) */
1868
if(ifr->ifr_flags & IFF_NOARP){
1869
if(debug){
1870
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1871
ifname);
1872
}
1873
return false;
1874
}
1875
1876
/* Accept this device */
1877
if(debug){
1878
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1879
}
1880
return true;
1881
}
1882
1883
/*
1884
* This function determines if a directory entry in /sys/class/net
1885
* corresponds to an acceptable network device.
1886
* (This function is passed to scandir(3) as a filter function.)
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
int good_interface(const struct dirent *if_entry){
1890
if(if_entry->d_name[0] == '.'){
1891
return 0;
1892
}
1893
1894
struct ifreq ifr;
1895
if(not get_flags(if_entry->d_name, &ifr)){
1896
if(debug){
1897
fprintf_plus(stderr, "Failed to get flags for interface "
1898
"\"%s\"\n", if_entry->d_name);
1899
}
1900
return 0;
1901
}
1902
1903
if(not good_flags(if_entry->d_name, &ifr)){
1904
return 0;
1905
}
1906
return 1;
1907
}
1908
1909
/*
1910
* This function determines if a network interface is up.
1911
*/
1912
__attribute__((nonnull, warn_unused_result))
1913
bool interface_is_up(const char *interface){
1914
struct ifreq ifr;
1915
if(not get_flags(interface, &ifr)){
1916
if(debug){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1919
}
1920
return false;
1921
}
1922
1923
return (bool)(ifr.ifr_flags & IFF_UP);
1924
}
1925
1926
/*
1927
* This function determines if a network interface is running
1928
*/
1929
__attribute__((nonnull, warn_unused_result))
1930
bool interface_is_running(const char *interface){
1931
struct ifreq ifr;
1932
if(not get_flags(interface, &ifr)){
1933
if(debug){
1934
fprintf_plus(stderr, "Failed to get flags for interface "
1935
"\"%s\"\n", interface);
1936
}
1937
return false;
1938
}
1939
1940
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1941
}
1942
1943
__attribute__((nonnull, pure, warn_unused_result))
1944
int notdotentries(const struct dirent *direntry){
1945
/* Skip "." and ".." */
1946
if(direntry->d_name[0] == '.'
1947
and (direntry->d_name[1] == '\0'
1948
or (direntry->d_name[1] == '.'
1949
and direntry->d_name[2] == '\0'))){
1950
return 0;
1951
}
1952
return 1;
1953
}
1954
1955
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1957
int runnable_hook(const struct dirent *direntry){
1958
int ret;
1959
size_t sret;
1960
struct stat st;
1961
1962
if((direntry->d_name)[0] == '\0'){
1963
/* Empty name? */
1964
return 0;
1965
}
1966
1967
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1968
"abcdefghijklmnopqrstuvwxyz"
1969
"0123456789"
1970
"_.-");
1971
if((direntry->d_name)[sret] != '\0'){
1972
/* Contains non-allowed characters */
1973
if(debug){
1974
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1975
direntry->d_name);
1976
}
1977
return 0;
1978
}
1979
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1981
if(ret == -1){
1982
if(debug){
1983
perror_plus("Could not stat hook");
1984
}
1985
return 0;
1986
}
1987
if(not (S_ISREG(st.st_mode))){
1988
/* Not a regular file */
1989
if(debug){
1990
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1991
direntry->d_name);
1992
}
1993
return 0;
1994
}
1995
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1996
/* Not executable */
1997
if(debug){
1998
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1999
direntry->d_name);
2000
}
2001
return 0;
2002
}
2003
if(debug){
2004
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2005
direntry->d_name);
2006
}
2007
return 1;
2008
}
2009
2010
__attribute__((nonnull, warn_unused_result))
2011
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2012
mandos_context *mc){
2013
int ret;
2014
struct timespec now;
2015
struct timespec waited_time;
2016
intmax_t block_time;
2017
2018
while(true){
2019
if(mc->current_server == NULL){
2020
if(debug){
2021
fprintf_plus(stderr, "Wait until first server is found."
2022
" No timeout!\n");
2023
}
2024
ret = avahi_simple_poll_iterate(s, -1);
2025
} else {
2026
if(debug){
2027
fprintf_plus(stderr, "Check current_server if we should run"
2028
" it, or wait\n");
2029
}
2030
/* the current time */
2031
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2032
if(ret == -1){
2033
perror_plus("clock_gettime");
2034
return -1;
2035
}
2036
/* Calculating in ms how long time between now and server
2037
who we visted longest time ago. Now - last seen. */
2038
waited_time.tv_sec = (now.tv_sec
2039
- mc->current_server->last_seen.tv_sec);
2040
waited_time.tv_nsec = (now.tv_nsec
2041
- mc->current_server->last_seen.tv_nsec);
2042
/* total time is 10s/10,000ms.
2043
Converting to s from ms by dividing by 1,000,
2044
and ns to ms by dividing by 1,000,000. */
2045
block_time = ((retry_interval
2046
- ((intmax_t)waited_time.tv_sec * 1000))
2047
- ((intmax_t)waited_time.tv_nsec / 1000000));
2048
2049
if(debug){
2050
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2051
block_time);
2052
}
2053
2054
if(block_time <= 0){
2055
ret = start_mandos_communication(mc->current_server->ip,
2056
mc->current_server->port,
2057
mc->current_server->if_index,
2058
mc->current_server->af, mc);
2059
if(ret == 0){
2060
avahi_simple_poll_quit(s);
2061
return 0;
2062
}
2063
ret = clock_gettime(CLOCK_MONOTONIC,
2064
&mc->current_server->last_seen);
2065
if(ret == -1){
2066
perror_plus("clock_gettime");
2067
return -1;
2068
}
2069
mc->current_server = mc->current_server->next;
2070
block_time = 0; /* Call avahi to find new Mandos
2071
servers, but don't block */
2072
}
2073
2074
ret = avahi_simple_poll_iterate(s, (int)block_time);
2075
}
2076
if(ret != 0){
2077
if(ret > 0 or errno != EINTR){
2078
return (ret != 1) ? ret : 0;
2079
}
2080
}
2081
}
2082
}
2083
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
2086
const float delay){
2087
struct dirent **direntries = NULL;
2088
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2090
| O_CLOEXEC);
2091
if(hookdir_fd == -1){
2092
if(errno == ENOENT){
2093
if(debug){
2094
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2095
" found\n", hookdir);
2096
}
2097
} else {
2098
perror_plus("open");
2099
}
2100
return;
2101
}
2102
}
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
if(devnull == -1){
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2106
return;
2107
}
2108
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
runnable_hook, alphasort);
2110
if(numhooks == -1){
2111
perror_plus("scandir");
2112
close(devnull);
2113
return;
2114
}
2115
struct dirent *direntry;
2116
int ret;
2117
for(int i = 0; i < numhooks; i++){
2118
direntry = direntries[i];
2119
if(debug){
2120
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2121
direntry->d_name);
2122
}
2123
pid_t hook_pid = fork();
2124
if(hook_pid == 0){
2125
/* Child */
2126
/* Raise privileges */
2127
errno = raise_privileges_permanently();
2128
if(errno != 0){
2129
perror_plus("Failed to raise privileges");
2130
_exit(EX_NOPERM);
2131
}
2132
/* Set group */
2133
errno = 0;
2134
ret = setgid(0);
2135
if(ret == -1){
2136
perror_plus("setgid");
2137
_exit(EX_NOPERM);
2138
}
2139
/* Reset supplementary groups */
2140
errno = 0;
2141
ret = setgroups(0, NULL);
2142
if(ret == -1){
2143
perror_plus("setgroups");
2144
_exit(EX_NOPERM);
2145
}
2146
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2147
if(ret == -1){
2148
perror_plus("setenv");
2149
_exit(EX_OSERR);
2150
}
2151
ret = setenv("DEVICE", interface, 1);
2152
if(ret == -1){
2153
perror_plus("setenv");
2154
_exit(EX_OSERR);
2155
}
2156
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2157
if(ret == -1){
2158
perror_plus("setenv");
2159
_exit(EX_OSERR);
2160
}
2161
ret = setenv("MODE", mode, 1);
2162
if(ret == -1){
2163
perror_plus("setenv");
2164
_exit(EX_OSERR);
2165
}
2166
char *delaystring;
2167
ret = asprintf(&delaystring, "%f", (double)delay);
2168
if(ret == -1){
2169
perror_plus("asprintf");
2170
_exit(EX_OSERR);
2171
}
2172
ret = setenv("DELAY", delaystring, 1);
2173
if(ret == -1){
2174
free(delaystring);
2175
perror_plus("setenv");
2176
_exit(EX_OSERR);
2177
}
2178
free(delaystring);
2179
if(connect_to != NULL){
2180
ret = setenv("CONNECT", connect_to, 1);
2181
if(ret == -1){
2182
perror_plus("setenv");
2183
_exit(EX_OSERR);
2184
}
2185
}
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2187
direntry->d_name,
2188
O_RDONLY));
2189
if(hook_fd == -1){
2190
perror_plus("openat");
2191
_exit(EXIT_FAILURE);
2192
}
2193
if(close(hookdir_fd) == -1){
2194
perror_plus("close");
2195
_exit(EXIT_FAILURE);
2196
}
2197
ret = dup2(devnull, STDIN_FILENO);
2198
if(ret == -1){
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2200
_exit(EX_OSERR);
2201
}
2202
ret = close(devnull);
2203
if(ret == -1){
2204
perror_plus("close");
2205
_exit(EX_OSERR);
2206
}
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2208
if(ret == -1){
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2210
_exit(EX_OSERR);
2211
}
2212
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2213
environ) == -1){
2214
perror_plus("fexecve");
2215
_exit(EXIT_FAILURE);
2216
}
2217
} else {
2218
if(hook_pid == -1){
2219
perror_plus("fork");
2220
free(direntry);
2221
continue;
2222
}
2223
int status;
2224
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
perror_plus("waitpid");
2226
free(direntry);
2227
continue;
2228
}
2229
if(WIFEXITED(status)){
2230
if(WEXITSTATUS(status) != 0){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
" with status %d\n", direntry->d_name,
2233
WEXITSTATUS(status));
2234
free(direntry);
2235
continue;
2236
}
2237
} else if(WIFSIGNALED(status)){
2238
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
" signal %d\n", direntry->d_name,
2240
WTERMSIG(status));
2241
free(direntry);
2242
continue;
2243
} else {
2244
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
" crashed\n", direntry->d_name);
2246
free(direntry);
2247
continue;
2248
}
2249
}
2250
if(debug){
2251
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2252
direntry->d_name);
2253
}
2254
free(direntry);
2255
}
2256
free(direntries);
2257
if(close(hookdir_fd) == -1){
2258
perror_plus("close");
2259
} else {
2260
hookdir_fd = -1;
2261
}
2262
close(devnull);
2263
}
2264
2265
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2267
const float delay){
2268
int old_errno = errno;
2269
int ret;
2270
struct ifreq network;
2271
unsigned int if_index = if_nametoindex(interface);
2272
if(if_index == 0){
2273
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2274
errno = old_errno;
2275
return ENXIO;
2276
}
2277
2278
if(quit_now){
2279
errno = old_errno;
2280
return EINTR;
2281
}
2282
2283
if(not interface_is_up(interface)){
2284
int ret_errno = 0;
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
2287
ret_errno = errno;
2288
fprintf_plus(stderr, "Failed to get flags for interface "
2289
"\"%s\"\n", interface);
2290
errno = old_errno;
2291
return ret_errno;
2292
}
2293
network.ifr_flags |= IFF_UP; /* set flag */
2294
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2296
if(sd == -1){
2297
ret_errno = errno;
2298
perror_plus("socket");
2299
errno = old_errno;
2300
return ret_errno;
2301
}
2302
2303
if(quit_now){
2304
ret = close(sd);
2305
if(ret == -1){
2306
perror_plus("close");
2307
}
2308
errno = old_errno;
2309
return EINTR;
2310
}
2311
2312
if(debug){
2313
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2314
interface);
2315
}
2316
2317
/* Raise privileges */
2318
ret_errno = raise_privileges();
2319
if(ret_errno != 0){
2320
errno = ret_errno;
2321
perror_plus("Failed to raise privileges");
2322
}
2323
2324
#ifdef __linux__
2325
int ret_linux;
2326
bool restore_loglevel = false;
2327
if(ret_errno == 0){
2328
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2329
messages about the network interface to mess up the prompt */
2330
ret_linux = klogctl(8, NULL, 5);
2331
if(ret_linux == -1){
2332
perror_plus("klogctl");
2333
} else {
2334
restore_loglevel = true;
2335
}
2336
}
2337
#endif /* __linux__ */
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
2340
#ifdef __linux__
2341
if(restore_loglevel){
2342
ret_linux = klogctl(7, NULL, 0);
2343
if(ret_linux == -1){
2344
perror_plus("klogctl");
2345
}
2346
}
2347
#endif /* __linux__ */
2348
2349
/* If raise_privileges() succeeded above */
2350
if(ret_errno == 0){
2351
/* Lower privileges */
2352
ret_errno = lower_privileges();
2353
if(ret_errno != 0){
2354
errno = ret_errno;
2355
perror_plus("Failed to lower privileges");
2356
}
2357
}
2358
2359
/* Close the socket */
2360
ret = close(sd);
2361
if(ret == -1){
2362
perror_plus("close");
2363
}
2364
2365
if(ret_setflags == -1){
2366
errno = ioctl_errno;
2367
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2368
errno = old_errno;
2369
return ioctl_errno;
2370
}
2371
} else if(debug){
2372
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2373
interface);
2374
}
2375
2376
/* Sleep checking until interface is running.
2377
Check every 0.25s, up to total time of delay */
2378
for(int i = 0; i < delay * 4; i++){
2379
if(interface_is_running(interface)){
2380
break;
2381
}
2382
struct timespec sleeptime = { .tv_nsec = 250000000 };
2383
ret = nanosleep(&sleeptime, NULL);
2384
if(ret == -1 and errno != EINTR){
2385
perror_plus("nanosleep");
2386
}
2387
}
2388
2389
errno = old_errno;
2390
return 0;
2391
}
2392
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
2396
struct ifreq network;
2397
unsigned int if_index = if_nametoindex(interface);
2398
if(if_index == 0){
2399
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2400
errno = old_errno;
2401
return ENXIO;
2402
}
2403
if(interface_is_up(interface)){
2404
int ret_errno = 0;
2405
int ioctl_errno = 0;
2406
if(not get_flags(interface, &network) and debug){
2407
ret_errno = errno;
2408
fprintf_plus(stderr, "Failed to get flags for interface "
2409
"\"%s\"\n", interface);
2410
errno = old_errno;
2411
return ret_errno;
2412
}
2413
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2414
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2416
if(sd == -1){
2417
ret_errno = errno;
2418
perror_plus("socket");
2419
errno = old_errno;
2420
return ret_errno;
2421
}
2422
2423
if(debug){
2424
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2425
interface);
2426
}
2427
2428
/* Raise privileges */
2429
ret_errno = raise_privileges();
2430
if(ret_errno != 0){
2431
errno = ret_errno;
2432
perror_plus("Failed to raise privileges");
2433
}
2434
2435
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
2437
2438
/* If raise_privileges() succeeded above */
2439
if(ret_errno == 0){
2440
/* Lower privileges */
2441
ret_errno = lower_privileges();
2442
if(ret_errno != 0){
2443
errno = ret_errno;
2444
perror_plus("Failed to lower privileges");
2445
}
2446
}
2447
2448
/* Close the socket */
2449
int ret = close(sd);
2450
if(ret == -1){
2451
perror_plus("close");
2452
}
2453
2454
if(ret_setflags == -1){
2455
errno = ioctl_errno;
2456
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2457
errno = old_errno;
2458
return ioctl_errno;
2459
}
2460
} else if(debug){
2461
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2462
interface);
2463
}
2464
2465
errno = old_errno;
2466
return 0;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
2467
972
}
2468
973
2469
974
int main(int argc, char *argv[]){
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
":%PROFILE_ULTRA",
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#else
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
#endif
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
2483
975
AvahiSServiceBrowser *sb = NULL;
2484
error_t ret_errno;
976
int error;
2485
977
int ret;
2486
978
intmax_t tmpmax;
2487
979
char *tmp;
2488
980
int exitcode = EXIT_SUCCESS;
2489
char *interfaces_to_take_down = NULL;
2490
size_t interfaces_to_take_down_size = 0;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
2494
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2495
991
const char *seckey = PATHDIR "/" SECKEY;
2496
992
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2500
#endif
2501
const char *dh_params_file = NULL;
2502
char *interfaces_hooks = NULL;
2503
993
2504
994
bool gnutls_initialized = false;
2505
995
bool gpgme_initialized = false;
2506
996
float delay = 2.5f;
2507
double retry_interval = 10; /* 10s between trying a server and
2508
retrying the same server again */
2509
997
2510
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
2511
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2512
1000
2513
uid = getuid();
2514
gid = getgid();
2515
2516
/* Lower any group privileges we might have, just to be safe */
2517
errno = 0;
2518
ret = setgid(gid);
2519
if(ret == -1){
2520
perror_plus("setgid");
2521
}
2522
2523
/* Lower user privileges (temporarily) */
2524
errno = 0;
2525
ret = seteuid(uid);
2526
if(ret == -1){
2527
perror_plus("seteuid");
2528
}
2529
2530
if(quit_now){
2531
goto end;
2532
}
2533
2534
1001
{
2535
1002
struct argp_option options[] = {
2536
1003
{ .name = "debug", .key = 128,
2551
1018
{ .name = "pubkey", .key = 'p',
2552
1019
.arg = "FILE",
2553
1020
.doc = "OpenPGP public key file base name",
2554
.group = 1 },
2555
{ .name = "tls-privkey", .key = 't',
2556
.arg = "FILE",
2557
#if GNUTLS_VERSION_NUMBER >= 0x030606
2558
.doc = "TLS private key file base name",
2559
#else
2560
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2561
#endif
2562
.group = 1 },
2563
{ .name = "tls-pubkey", .key = 'T',
2564
.arg = "FILE",
2565
#if GNUTLS_VERSION_NUMBER >= 0x030606
2566
.doc = "TLS public key file base name",
2567
#else
2568
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2569
#endif
2570
.group = 1 },
1021
.group = 2 },
2571
1022
{ .name = "dh-bits", .key = 129,
2572
1023
.arg = "BITS",
2573
1024
.doc = "Bit length of the prime number used in the"
2574
1025
" Diffie-Hellman key exchange",
2575
1026
.group = 2 },
2576
{ .name = "dh-params", .key = 134,
2577
.arg = "FILE",
2578
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2579
" for the Diffie-Hellman key exchange",
2580
.group = 2 },
2581
1027
{ .name = "priority", .key = 130,
2582
1028
.arg = "STRING",
2583
1029
.doc = "GnuTLS priority string for the TLS handshake",
2586
1032
.arg = "SECONDS",
2587
1033
.doc = "Maximum delay to wait for interface startup",
2588
1034
.group = 2 },
2589
{ .name = "retry", .key = 132,
2590
.arg = "SECONDS",
2591
.doc = "Retry interval used when denied by the Mandos server",
2592
.group = 2 },
2593
{ .name = "network-hook-dir", .key = 133,
2594
.arg = "DIR",
2595
.doc = "Directory where network hooks are located",
2596
.group = 2 },
2597
/*
2598
* These reproduce what we would get without ARGP_NO_HELP
2599
*/
2600
{ .name = "help", .key = '?',
2601
.doc = "Give this help list", .group = -1 },
2602
{ .name = "usage", .key = -3,
2603
.doc = "Give a short usage message", .group = -1 },
2604
{ .name = "version", .key = 'V',
2605
.doc = "Print program version", .group = -1 },
2606
1035
{ .name = NULL }
2607
1036
};
2608
1037
2609
1038
error_t parse_opt(int key, char *arg,
2610
1039
struct argp_state *state){
2611
errno = 0;
2612
1040
switch(key){
2613
1041
case 128: /* --debug */
2614
1042
debug = true;
2617
1045
connect_to = arg;
2618
1046
break;
2619
1047
case 'i': /* --interface */
2620
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2621
arg, (int)',');
2622
if(ret_errno != 0){
2623
argp_error(state, "%s", strerror(ret_errno));
2624
}
1048
interface = arg;
2625
1049
break;
2626
1050
case 's': /* --seckey */
2627
1051
seckey = arg;
2629
1053
case 'p': /* --pubkey */
2630
1054
pubkey = arg;
2631
1055
break;
2632
case 't': /* --tls-privkey */
2633
#if GNUTLS_VERSION_NUMBER >= 0x030606
2634
tls_privkey = arg;
2635
#endif
2636
break;
2637
case 'T': /* --tls-pubkey */
2638
#if GNUTLS_VERSION_NUMBER >= 0x030606
2639
tls_pubkey = arg;
2640
#endif
2641
break;
2642
1056
case 129: /* --dh-bits */
2643
1057
errno = 0;
2644
1058
tmpmax = strtoimax(arg, &tmp, 10);
2645
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
2646
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2647
argp_error(state, "Bad number of DH bits");
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
2648
1063
}
2649
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2650
1065
break;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2653
break;
2654
1066
case 130: /* --priority */
2655
1067
mc.priority = arg;
2656
1068
break;
2658
1070
errno = 0;
2659
1071
delay = strtof(arg, &tmp);
2660
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
2661
argp_error(state, "Bad delay");
2662
}
2663
case 132: /* --retry */
2664
errno = 0;
2665
retry_interval = strtod(arg, &tmp);
2666
if(errno != 0 or tmp == arg or *tmp != '\0'
2667
or (retry_interval * 1000) > INT_MAX
2668
or retry_interval < 0){
2669
argp_error(state, "Bad retry interval");
2670
}
2671
break;
2672
case 133: /* --network-hook-dir */
2673
hookdir = arg;
2674
break;
2675
/*
2676
* These reproduce what we would get without ARGP_NO_HELP
2677
*/
2678
case '?': /* --help */
2679
argp_state_help(state, state->out_stream,
2680
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2681
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
2683
case -3: /* --usage */
2684
argp_state_help(state, state->out_stream,
2685
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
2687
case 'V': /* --version */
2688
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2689
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
2690
1080
break;
2691
1081
default:
2692
1082
return ARGP_ERR_UNKNOWN;
2693
1083
}
2694
return errno;
1084
return 0;
2695
1085
}
2696
1086
2697
1087
struct argp argp = { .options = options, .parser = parse_opt,
2698
1088
.args_doc = "",
2699
1089
.doc = "Mandos client -- Get and decrypt"
2700
1090
" passwords from a Mandos server" };
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2703
switch(ret_errno){
2704
case 0:
2705
break;
2706
case ENOMEM:
2707
default:
2708
errno = ret_errno;
2709
perror_plus("argp_parse");
2710
exitcode = EX_OSERR;
2711
goto end;
2712
case EINVAL:
2713
exitcode = EX_USAGE;
2714
goto end;
2715
}
2716
}
2717
2718
{
2719
/* Work around Debian bug #633582:
2720
<https://bugs.debian.org/633582> */
2721
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2724
if(ret != 0){
2725
errno = ret;
2726
perror_plus("Failed to raise privileges");
2727
} else {
2728
struct stat st;
2729
2730
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2731
int seckey_fd = open(seckey, O_RDONLY);
2732
if(seckey_fd == -1){
2733
perror_plus("open");
2734
} else {
2735
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2736
if(ret == -1){
2737
perror_plus("fstat");
2738
} else {
2739
if(S_ISREG(st.st_mode)
2740
and st.st_uid == 0 and st.st_gid == 0){
2741
ret = fchown(seckey_fd, uid, gid);
2742
if(ret == -1){
2743
perror_plus("fchown");
2744
}
2745
}
2746
}
2747
close(seckey_fd);
2748
}
2749
}
2750
2751
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2752
int pubkey_fd = open(pubkey, O_RDONLY);
2753
if(pubkey_fd == -1){
2754
perror_plus("open");
2755
} else {
2756
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2757
if(ret == -1){
2758
perror_plus("fstat");
2759
} else {
2760
if(S_ISREG(st.st_mode)
2761
and st.st_uid == 0 and st.st_gid == 0){
2762
ret = fchown(pubkey_fd, uid, gid);
2763
if(ret == -1){
2764
perror_plus("fchown");
2765
}
2766
}
2767
}
2768
close(pubkey_fd);
2769
}
2770
}
2771
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2777
} else {
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2779
if(ret == -1){
2780
perror_plus("fstat");
2781
} else {
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2785
if(ret == -1){
2786
perror_plus("fchown");
2787
}
2788
}
2789
}
2790
close(dhparams_fd);
2791
}
2792
}
2793
2794
/* Lower privileges */
2795
ret = lower_privileges();
2796
if(ret != 0){
2797
errno = ret;
2798
perror_plus("Failed to lower privileges");
2799
}
2800
}
2801
}
2802
2803
/* Remove invalid interface names (except "none") */
2804
{
2805
char *interface = NULL;
2806
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2807
interface))){
2808
if(strcmp(interface, "none") != 0
2809
and if_nametoindex(interface) == 0){
2810
if(interface[0] != '\0'){
2811
fprintf_plus(stderr, "Not using nonexisting interface"
2812
" \"%s\"\n", interface);
2813
}
2814
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2815
interface = NULL;
2816
}
2817
}
2818
}
2819
2820
/* Run network hooks */
2821
{
2822
if(mc.interfaces != NULL){
2823
interfaces_hooks = malloc(mc.interfaces_size);
2824
if(interfaces_hooks == NULL){
2825
perror_plus("malloc");
2826
goto end;
2827
}
2828
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2829
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2830
}
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
2833
1097
}
2834
1098
2835
1099
if(not debug){
2840
1104
from the signal handler */
2841
1105
/* Initialize the pseudo-RNG for Avahi */
2842
1106
srand((unsigned int) time(NULL));
2843
simple_poll = avahi_simple_poll_new();
2844
if(simple_poll == NULL){
2845
fprintf_plus(stderr,
2846
"Avahi: Failed to create simple poll object.\n");
2847
exitcode = EX_UNAVAILABLE;
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
2848
1111
goto end;
2849
1112
}
2850
1113
2851
1114
sigemptyset(&sigterm_action.sa_mask);
2852
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2853
1116
if(ret == -1){
2854
perror_plus("sigaddset");
2855
exitcode = EX_OSERR;
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
2856
1119
goto end;
2857
1120
}
2858
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2859
1122
if(ret == -1){
2860
perror_plus("sigaddset");
2861
exitcode = EX_OSERR;
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
2862
1125
goto end;
2863
1126
}
2864
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2865
1128
if(ret == -1){
2866
perror_plus("sigaddset");
2867
exitcode = EX_OSERR;
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
2868
1131
goto end;
2869
1132
}
2870
1133
/* Need to check if the handler is SIG_IGN before handling:
2873
1136
*/
2874
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2875
1138
if(ret == -1){
2876
perror_plus("sigaction");
2877
return EX_OSERR;
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2878
1141
}
2879
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
2880
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
2881
1144
if(ret == -1){
2882
perror_plus("sigaction");
2883
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2884
1147
goto end;
2885
1148
}
2886
1149
}
2887
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2888
1151
if(ret == -1){
2889
perror_plus("sigaction");
2890
return EX_OSERR;
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2891
1154
}
2892
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
2893
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2894
1157
if(ret == -1){
2895
perror_plus("sigaction");
2896
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2897
1160
goto end;
2898
1161
}
2899
1162
}
2900
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2901
1164
if(ret == -1){
2902
perror_plus("sigaction");
2903
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2904
1167
}
2905
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2906
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2907
1170
if(ret == -1){
2908
perror_plus("sigaction");
2909
exitcode = EX_OSERR;
2910
goto end;
2911
}
2912
}
2913
2914
/* If no interfaces were specified, make a list */
2915
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2917
/* Look for any good interfaces */
2918
ret = scandir(sys_class_net, &direntries, good_interface,
2919
alphasort);
2920
if(ret >= 1){
2921
/* Add all found interfaces to interfaces list */
2922
for(int i = 0; i < ret; ++i){
2923
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2924
direntries[i]->d_name);
2925
if(ret_errno != 0){
2926
errno = ret_errno;
2927
perror_plus("argz_add");
2928
free(direntries[i]);
2929
continue;
2930
}
2931
if(debug){
2932
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2933
direntries[i]->d_name);
2934
}
2935
free(direntries[i]);
2936
}
2937
free(direntries);
2938
} else {
2939
if(ret == 0){
2940
free(direntries);
2941
}
2942
fprintf_plus(stderr, "Could not find a network interface\n");
2943
exitcode = EXIT_FAILURE;
2944
goto end;
2945
}
2946
}
2947
2948
/* Bring up interfaces which are down, and remove any "none"s */
2949
{
2950
char *interface = NULL;
2951
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2952
interface))){
2953
/* If interface name is "none", stop bringing up interfaces.
2954
Also remove all instances of "none" from the list */
2955
if(strcmp(interface, "none") == 0){
2956
argz_delete(&mc.interfaces, &mc.interfaces_size,
2957
interface);
2958
interface = NULL;
2959
while((interface = argz_next(mc.interfaces,
2960
mc.interfaces_size, interface))){
2961
if(strcmp(interface, "none") == 0){
2962
argz_delete(&mc.interfaces, &mc.interfaces_size,
2963
interface);
2964
interface = NULL;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
2965
1243
}
2966
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
2967
1255
break;
2968
1256
}
2969
bool interface_was_up = interface_is_up(interface);
2970
errno = bring_up_interface(interface, delay);
2971
if(not interface_was_up){
2972
if(errno != 0){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2975
} else {
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2978
interface);
2979
if(errno != 0){
2980
perror_plus("argz_add");
2981
}
2982
}
2983
}
2984
}
2985
if(debug and (interfaces_to_take_down == NULL)){
2986
fprintf_plus(stderr, "No interfaces were brought up\n");
2987
}
2988
}
2989
2990
/* If we only got one interface, explicitly use only that one */
2991
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2992
if(debug){
2993
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2994
mc.interfaces);
2995
}
2996
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2997
}
2998
2999
if(quit_now){
3000
goto end;
3001
}
3002
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3007
#else
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3009
#endif
3010
if(ret == -1){
3011
fprintf_plus(stderr, "init_gnutls_global failed\n");
3012
exitcode = EX_UNAVAILABLE;
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
1300
ret = seteuid(uid);
1301
if(ret == -1){
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
1309
}
1310
}
1311
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
ret = init_gnutls_global(pubkey, seckey);
1317
if(ret == -1){
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
3013
1320
goto end;
3014
1321
} else {
3015
1322
gnutls_initialized = true;
3019
1326
goto end;
3020
1327
}
3021
1328
3022
/* Try /run/tmp before /tmp */
3023
tempdir = mkdtemp(run_tempdir);
3024
if(tempdir == NULL and errno == ENOENT){
3025
if(debug){
3026
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3027
run_tempdir, old_tempdir);
3028
}
3029
tempdir = mkdtemp(old_tempdir);
3030
}
3031
if(tempdir == NULL){
3032
perror_plus("mkdtemp");
1329
tempdir_created = true;
1330
if(mkdtemp(tempdir) == NULL){
1331
tempdir_created = false;
1332
perror("mkdtemp");
3033
1333
goto end;
3034
1334
}
3035
1335
3037
1337
goto end;
3038
1338
}
3039
1339
3040
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3041
fprintf_plus(stderr, "init_gpgme failed\n");
3042
exitcode = EX_UNAVAILABLE;
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
3043
1343
goto end;
3044
1344
} else {
3045
1345
gpgme_initialized = true;
3053
1353
/* Connect directly, do not use Zeroconf */
3054
1354
/* (Mainly meant for debugging) */
3055
1355
char *address = strrchr(connect_to, ':');
3056
3057
1356
if(address == NULL){
3058
fprintf_plus(stderr, "No colon in address\n");
3059
exitcode = EX_USAGE;
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
3060
1359
goto end;
3061
1360
}
3062
1361
3064
1363
goto end;
3065
1364
}
3066
1365
3067
in_port_t port;
1366
uint16_t port;
3068
1367
errno = 0;
3069
1368
tmpmax = strtoimax(address+1, &tmp, 10);
3070
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3071
or tmpmax != (in_port_t)tmpmax){
3072
fprintf_plus(stderr, "Bad port number\n");
3073
exitcode = EX_USAGE;
1370
or tmpmax != (uint16_t)tmpmax){
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
3074
1373
goto end;
3075
1374
}
3076
1375
3077
1376
if(quit_now){
3078
1377
goto end;
3079
1378
}
3080
1379
3081
port = (in_port_t)tmpmax;
1380
port = (uint16_t)tmpmax;
3082
1381
*address = '\0';
1382
address = connect_to;
3083
1383
/* Colon in address indicates IPv6 */
3084
1384
int af;
3085
if(strchr(connect_to, ':') != NULL){
1385
if(strchr(address, ':') != NULL){
3086
1386
af = AF_INET6;
3087
/* Accept [] around IPv6 address - see RFC 5952 */
3088
if(connect_to[0] == '[' and address[-1] == ']')
3089
{
3090
connect_to++;
3091
address[-1] = '\0';
3092
}
3093
1387
} else {
3094
1388
af = AF_INET;
3095
1389
}
3096
address = connect_to;
3097
1390
3098
1391
if(quit_now){
3099
1392
goto end;
3100
1393
}
3101
1394
3102
while(not quit_now){
3103
ret = start_mandos_communication(address, port, if_index, af,
3104
&mc);
3105
if(quit_now or ret == 0){
3106
break;
3107
}
3108
if(debug){
3109
fprintf_plus(stderr, "Retrying in %d seconds\n",
3110
(int)retry_interval);
3111
}
3112
sleep((unsigned int)retry_interval);
3113
}
3114
3115
if(not quit_now){
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
3116
1399
exitcode = EXIT_SUCCESS;
3117
1400
}
3118
3119
1401
goto end;
3120
1402
}
3121
1403
3133
1415
config.publish_domain = 0;
3134
1416
3135
1417
/* Allocate a new server */
3136
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3137
&config, NULL, NULL, &ret);
1418
mc.server = avahi_server_new(avahi_simple_poll_get
1419
(mc.simple_poll), &config, NULL,
1420
NULL, &error);
3138
1421
3139
1422
/* Free the Avahi configuration data */
3140
1423
avahi_server_config_free(&config);
3142
1425
3143
1426
/* Check if creating the Avahi server object succeeded */
3144
1427
if(mc.server == NULL){
3145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3146
avahi_strerror(ret));
3147
exitcode = EX_UNAVAILABLE;
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
3148
1431
goto end;
3149
1432
}
3150
1433
3155
1438
/* Create the Avahi service browser */
3156
1439
sb = avahi_s_service_browser_new(mc.server, if_index,
3157
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3158
NULL, 0, browse_callback,
3159
(void *)&mc);
1441
NULL, 0, browse_callback, NULL);
3160
1442
if(sb == NULL){
3161
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3162
avahi_strerror(avahi_server_errno(mc.server)));
3163
exitcode = EX_UNAVAILABLE;
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
3164
1446
goto end;
3165
1447
}
3166
1448
3171
1453
/* Run the main loop */
3172
1454
3173
1455
if(debug){
3174
fprintf_plus(stderr, "Starting Avahi loop search\n");
1456
fprintf(stderr, "Starting Avahi loop search\n");
3175
1457
}
3176
1458
3177
ret = avahi_loop_with_timeout(simple_poll,
3178
(int)(retry_interval * 1000), &mc);
3179
if(debug){
3180
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3181
(ret == 0) ? "successfully" : "with error");
3182
}
1459
avahi_simple_poll_loop(mc.simple_poll);
3183
1460
3184
1461
end:
3185
1462
3186
1463
if(debug){
3187
if(signal_received){
3188
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3189
argv[0], signal_received,
3190
strsignal(signal_received));
3191
} else {
3192
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3193
}
1464
fprintf(stderr, "%s exiting\n", argv[0]);
3194
1465
}
3195
1466
3196
1467
/* Cleanup things */
3197
free(mc.interfaces);
3198
3199
1468
if(sb != NULL)
3200
1469
avahi_s_service_browser_free(sb);
3201
1470
3202
1471
if(mc.server != NULL)
3203
1472
avahi_server_free(mc.server);
3204
1473
3205
if(simple_poll != NULL)
3206
avahi_simple_poll_free(simple_poll);
1474
if(mc.simple_poll != NULL)
1475
avahi_simple_poll_free(mc.simple_poll);
3207
1476
3208
1477
if(gnutls_initialized){
3209
1478
gnutls_certificate_free_credentials(mc.cred);
1479
gnutls_global_deinit();
3210
1480
gnutls_dh_params_deinit(mc.dh_params);
3211
1481
}
3212
1482
3214
1484
gpgme_release(mc.ctx);
3215
1485
}
3216
1486
3217
/* Cleans up the circular linked list of Mandos servers the client
3218
has seen */
3219
if(mc.current_server != NULL){
3220
mc.current_server->prev->next = NULL;
3221
while(mc.current_server != NULL){
3222
server *next = mc.current_server->next;
3223
#ifdef __GNUC__
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3226
#endif
3227
free((char *)(mc.current_server->ip));
3228
#ifdef __GNUC__
3229
#pragma GCC diagnostic pop
3230
#endif
3231
free(mc.current_server);
3232
mc.current_server = next;
3233
}
3234
}
3235
3236
/* Re-raise privileges */
3237
{
3238
ret = raise_privileges();
3239
if(ret != 0){
3240
errno = ret;
3241
perror_plus("Failed to raise privileges");
3242
} else {
3243
3244
/* Run network hooks */
3245
run_network_hooks("stop", interfaces_hooks != NULL ?
3246
interfaces_hooks : "", delay);
3247
3248
/* Take down the network interfaces which were brought up */
3249
{
3250
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3253
interface))){
3254
ret = take_down_interface(interface);
3255
if(ret != 0){
3256
errno = ret;
3257
perror_plus("Failed to take down interface");
3258
}
3259
}
3260
if(debug and (interfaces_to_take_down == NULL)){
3261
fprintf_plus(stderr, "No interfaces needed to be taken"
3262
" down\n");
3263
}
3264
}
3265
}
3266
3267
ret = lower_privileges_permanently();
3268
if(ret != 0){
3269
errno = ret;
3270
perror_plus("Failed to lower privileges permanently");
3271
}
3272
}
3273
3274
free(interfaces_to_take_down);
3275
free(interfaces_hooks);
3276
3277
void clean_dir_at(int base, const char * const dirname,
3278
uintmax_t level){
3279
struct dirent **direntries = NULL;
3280
int dret;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3282
O_RDONLY
3283
| O_NOFOLLOW
3284
| O_DIRECTORY
3285
| O_PATH));
3286
if(dir_fd == -1){
3287
perror_plus("open");
3288
return;
3289
}
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
3293
for(int i = 0; i < numentries; i++){
3294
if(debug){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3297
}
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3299
if(dret == -1){
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3302
AT_REMOVEDIR);
3303
}
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3309
dret = 0;
3310
}
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3314
}
3315
}
3316
free(direntries[i]);
3317
}
3318
3319
/* need to clean even if 0 because man page doesn't specify */
3320
free(direntries);
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3324
}
3325
} else {
3326
perror_plus("scandirat");
3327
}
3328
close(dir_fd);
3329
}
3330
3331
/* Removes the GPGME temp directory and all files inside */
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
1494
}
1495
if(geteuid() == 0){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1502
if(ret == -1){
1503
perror("ioctl SIOCSIFFLAGS");
1504
}
1505
}
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1507
if(ret == -1){
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
1515
}
1516
}
1517
}
1518
1519
/* Removes the temp directory used by GPGME */
1520
if(tempdir_created){
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1526
perror("opendir");
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
1541
char *fullname = NULL;
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
1543
direntry->d_name);
1544
if(ret < 0){
1545
perror("asprintf");
1546
continue;
1547
}
1548
ret = remove(fullname);
1549
if(ret == -1){
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
1552
}
1553
free(fullname);
1554
}
1555
closedir(d);
1556
}
1557
ret = rmdir(tempdir);
1558
if(ret == -1 and errno != ENOENT){
1559
perror("rmdir");
1560
}
3334
1561
}
3335
1562
3336
1563
if(quit_now){
3337
1564
sigemptyset(&old_sigterm_action.sa_mask);
3338
1565
old_sigterm_action.sa_handler = SIG_DFL;
3339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3340
&old_sigterm_action,
3341
NULL));
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
3342
1567
if(ret == -1){
3343
perror_plus("sigaction");
3344
}
3345
do {
3346
ret = raise(signal_received);
3347
} while(ret != 0 and errno == EINTR);
3348
if(ret != 0){
3349
perror_plus("raise");
3350
abort();
3351
}
3352
TEMP_FAILURE_RETRY(pause());
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
3353
1571
}
3354
1572
3355
1573
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0