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- Committer: Teddy Hogeborn
- Date: 2018-08-19 01:35:11 UTC
- Revision ID: teddy@recompile.se-20180819013511-cku25q9yeub3dnr0
Adapt to changes in cryptsetup; use "cryptroot-unlock" program
* Makefile (install-client-nokey): Also install new script files
"mandos-to-cryptroot-unlock" and "initramfs-tools-script-stop".
* debian/mandos-client.dirs: Add
"usr/share/initramfs-tools/scripts/local-premount".
* initramfs-tools-hook: Also copy "mandos-to-cryptroot-unlock".
* initramfs-tools-script: Only modify keyscript setting in cryptroot
file if the file exists, otherwise start
"mandos-to-cryptroot-unlock" in background.
* initramfs-tools-script-stop: New script to make sure plugin-runner
has stopped before continuing.
* mandos-to-cryptroot-unlock: New script to run plugin-runner and feed
any password it gets into the "cryptroot-unlock" program.
* Makefile (install-client-nokey): Also install new script files
"mandos-to-cryptroot-unlock" and "initramfs-tools-script-stop".
* debian/mandos-client.dirs: Add
"usr/share/initramfs-tools/scripts/local-premount".
* initramfs-tools-hook: Also copy "mandos-to-cryptroot-unlock".
* initramfs-tools-script: Only modify keyscript setting in cryptroot
file if the file exists, otherwise start
"mandos-to-cryptroot-unlock" in background.
* initramfs-tools-script-stop: New script to make sure plugin-runner
has stopped before continuing.
* mandos-to-cryptroot-unlock: New script to run plugin-runner and feed
any password it gets into the "cryptroot-unlock" program.
- files added:
- bugs.xml
- debian/upstream
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
85
92
raise() */
86
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
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() */
88
104
89
105
#ifdef __linux__
90
106
#include <sys/klog.h> /* klogctl() */
108
124
init_gnutls_session(),
109
125
GNUTLS_* */
110
126
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
113
129
114
130
/* GPGME */
115
131
#include <gpgme.h> /* All GPGME types, constants and
131
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
148
static const char sys_class_net[] = "/sys/class/net";
133
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
134
154
135
155
/* Doubly linked list that need to be circularly linked when used */
136
156
typedef struct server{
137
157
const char *ip;
138
uint16_t port;
158
in_port_t port;
139
159
AvahiIfIndex if_index;
140
160
int af;
141
161
struct timespec last_seen;
145
165
146
166
/* Used for passing in values through the Avahi callback functions */
147
167
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
168
AvahiServer *server;
150
169
gnutls_certificate_credentials_t cred;
151
170
unsigned int dh_bits;
153
172
const char *priority;
154
173
gpgme_ctx_t ctx;
155
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
156
177
} mandos_context;
157
178
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
163
181
164
182
sig_atomic_t quit_now = 0;
165
183
int signal_received = 0;
166
184
167
185
/* Function to use when printing errors */
168
186
void perror_plus(const char *print_text){
187
int e = errno;
169
188
fprintf(stderr, "Mandos plugin %s: ",
170
189
program_invocation_short_name);
190
errno = e;
171
191
perror(print_text);
172
192
}
173
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
203
174
204
/*
175
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
206
* bytes. "buffer_capacity" is how much is currently allocated,
177
207
* "buffer_length" is how much is already used.
178
208
*/
209
__attribute__((nonnull, warn_unused_result))
179
210
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
211
size_t buffer_capacity){
181
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
184
219
return 0;
185
220
}
221
*buffer = new_buf;
186
222
buffer_capacity += BUFFER_SIZE;
187
223
}
188
224
return buffer_capacity;
189
225
}
190
226
191
227
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
195
231
int ret;
196
232
server *new_server = malloc(sizeof(server));
197
233
if(new_server == NULL){
198
234
perror_plus("malloc");
199
return -1;
235
return false;
200
236
}
201
237
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
238
.port = port,
239
.if_index = if_index,
240
.af = af };
205
241
if(new_server->ip == NULL){
206
242
perror_plus("strdup");
207
return -1;
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
208
259
}
209
260
/* Special case of first server */
210
if (mc.current_server == NULL){
261
if(*current_server == NULL){
211
262
new_server->next = new_server;
212
263
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
264
*current_server = new_server;
215
265
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
218
269
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
279
int ret = 0;
280
if(seteuid(0) == -1){
281
ret = errno;
282
}
283
errno = old_errno;
284
return ret;
285
}
286
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
292
if(ret != 0){
293
errno = old_errno;
294
return ret;
295
}
296
if(setuid(0) == -1){
297
ret = errno;
298
}
299
errno = old_errno;
300
return ret;
301
}
302
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
307
int ret = 0;
308
if(seteuid(uid) == -1){
309
ret = errno;
310
}
311
errno = old_errno;
312
return ret;
313
}
314
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
319
int ret = 0;
320
if(setuid(uid) == -1){
321
ret = errno;
322
}
323
errno = old_errno;
324
return ret;
227
325
}
228
326
229
327
/*
230
328
* Initialize GPGME.
231
329
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
330
__attribute__((nonnull, warn_unused_result))
331
static bool init_gpgme(const char * const seckey,
332
const char * const pubkey,
333
const char * const tempdir,
334
mandos_context *mc){
234
335
gpgme_error_t rc;
235
336
gpgme_engine_info_t engine_info;
236
337
237
238
338
/*
239
339
* Helper function to insert pub and seckey to the engine keyring.
240
340
*/
241
bool import_key(const char *filename){
341
bool import_key(const char * const filename){
242
342
int ret;
243
343
int fd;
244
344
gpgme_data_t pgp_data;
249
349
return false;
250
350
}
251
351
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
354
do {
355
{
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
358
struct tm tm;
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
361
break;
362
}
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
364
break;
365
}
366
if(debug){
367
fprintf_plus(stderr, "System clock is January 1970");
368
}
369
} else {
370
if(debug){
371
fprintf_plus(stderr, "System clock is invalid");
372
}
373
}
374
}
375
struct stat keystat;
376
ret = fstat(fd, &keystat);
377
if(ret != 0){
378
perror_plus("fstat");
379
break;
380
}
381
ret = raise_privileges();
382
if(ret != 0){
383
errno = ret;
384
perror_plus("Failed to raise privileges");
385
break;
386
}
387
if(debug){
388
fprintf_plus(stderr,
389
"Setting system clock to key file mtime");
390
}
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
394
}
395
ret = lower_privileges();
396
if(ret != 0){
397
errno = ret;
398
perror_plus("Failed to lower privileges");
399
}
400
} while(false);
401
252
402
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
403
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
404
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
256
406
return false;
257
407
}
258
408
259
rc = gpgme_op_import(mc.ctx, pgp_data);
409
rc = gpgme_op_import(mc->ctx, pgp_data);
260
410
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
411
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
263
413
return false;
264
414
}
415
{
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
422
fprintf_plus(stderr,
423
"The total number of considered keys: %d\n",
424
import_result->considered);
425
fprintf_plus(stderr,
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
428
fprintf_plus(stderr,
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
443
fprintf_plus(stderr,
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
446
fprintf_plus(stderr,
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
449
fprintf_plus(stderr,
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
459
import_status->fpr);
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
464
}
465
fprintf_plus(stderr, "Key status:\n");
466
fprintf_plus(stderr,
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
470
fprintf_plus(stderr,
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
486
}
487
return false;
488
}
489
}
265
490
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
491
ret = close(fd);
267
492
if(ret == -1){
268
493
perror_plus("close");
269
494
}
272
497
}
273
498
274
499
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
500
fprintf_plus(stderr, "Initializing GPGME\n");
276
501
}
277
502
278
503
/* Init GPGME */
279
504
gpgme_check_version(NULL);
280
505
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
506
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
507
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
508
gpgme_strsource(rc), gpgme_strerror(rc));
284
509
return false;
285
510
}
286
511
287
512
/* Set GPGME home directory for the OpenPGP engine only */
288
513
rc = gpgme_get_engine_info(&engine_info);
289
514
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
515
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
516
gpgme_strsource(rc), gpgme_strerror(rc));
292
517
return false;
293
518
}
294
519
while(engine_info != NULL){
300
525
engine_info = engine_info->next;
301
526
}
302
527
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
528
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
529
tempdir);
304
530
return false;
305
531
}
306
532
307
533
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
534
rc = gpgme_new(&(mc->ctx));
309
535
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
312
538
return false;
313
539
}
314
540
323
549
* Decrypt OpenPGP data.
324
550
* Returns -1 on error
325
551
*/
552
__attribute__((nonnull, warn_unused_result))
326
553
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
554
size_t crypto_size,
328
char **plaintext){
555
char **plaintext,
556
mandos_context *mc){
329
557
gpgme_data_t dh_crypto, dh_plain;
330
558
gpgme_error_t rc;
331
559
ssize_t ret;
333
561
ssize_t plaintext_length = 0;
334
562
335
563
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
564
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
565
}
338
566
339
567
/* Create new GPGME data buffer from memory cryptotext */
340
568
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
569
0);
342
570
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
571
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
572
gpgme_strsource(rc), gpgme_strerror(rc));
345
573
return -1;
346
574
}
347
575
348
576
/* Create new empty GPGME data buffer for the plaintext */
349
577
rc = gpgme_data_new(&dh_plain);
350
578
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
353
581
gpgme_data_release(dh_crypto);
354
582
return -1;
355
583
}
356
584
357
585
/* Decrypt data from the cryptotext data buffer to the plaintext
358
586
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
587
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
588
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
589
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
590
gpgme_strsource(rc), gpgme_strerror(rc));
363
591
plaintext_length = -1;
364
592
if(debug){
365
593
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
594
result = gpgme_op_decrypt_result(mc->ctx);
367
595
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
596
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
597
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
601
}
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
374
604
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
605
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
606
}
377
gpgme_recipient_t recipient;
378
recipient = result->recipients;
379
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
386
recipient = recipient->next;
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
610
fprintf_plus(stderr, "Public key algorithm: %s\n",
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
613
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
387
615
}
388
616
}
389
617
}
391
619
}
392
620
393
621
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
622
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
623
}
396
624
397
625
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
632
*plaintext = NULL;
405
633
while(true){
406
634
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
635
(size_t)plaintext_length,
636
plaintext_capacity);
409
637
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
638
perror_plus("incbuffer");
639
plaintext_length = -1;
640
goto decrypt_end;
413
641
}
414
642
415
643
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
656
}
429
657
430
658
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
659
fprintf_plus(stderr, "Decrypted password is: ");
432
660
for(ssize_t i = 0; i < plaintext_length; i++){
433
661
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
662
}
445
673
return plaintext_length;
446
674
}
447
675
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
452
ret = "(unknown)";
453
return ret;
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
678
if(str == NULL)
679
return "(unknown)";
680
return str;
681
}
682
683
__attribute__((warn_unused_result))
684
static const char *safer_gnutls_strerror(int value){
685
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
454
687
}
455
688
456
689
/* GnuTLS log function callback */
690
__attribute__((nonnull))
457
691
static void debuggnutls(__attribute__((unused)) int level,
458
692
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
693
fprintf_plus(stderr, "GnuTLS: %s", string);
460
694
}
461
695
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
462
697
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
698
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
mandos_context *mc){
464
701
int ret;
702
unsigned int uret;
465
703
466
704
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
468
}
469
470
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
474
return -1;
705
fprintf_plus(stderr, "Initializing GnuTLS\n");
475
706
}
476
707
477
708
if(debug){
483
714
}
484
715
485
716
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
717
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
718
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
719
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
safer_gnutls_strerror(ret));
491
721
return -1;
492
722
}
493
723
494
724
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
725
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
726
" secret key %s as GnuTLS credentials\n",
727
pubkeyfilename,
728
seckeyfilename);
498
729
}
499
730
500
731
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
732
(mc->cred, pubkeyfilename, seckeyfilename,
502
733
GNUTLS_OPENPGP_FMT_BASE64);
503
734
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
735
fprintf_plus(stderr,
736
"Error[%d] while reading the OpenPGP key pair ('%s',"
737
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
738
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
739
safer_gnutls_strerror(ret));
509
740
goto globalfail;
510
741
}
511
742
512
743
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
744
ret = gnutls_dh_params_init(&mc->dh_params);
745
if(ret != GNUTLS_E_SUCCESS){
746
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
747
" initialization: %s\n",
748
safer_gnutls_strerror(ret));
749
goto globalfail;
750
}
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
754
do {
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
756
if(dhpfile == -1){
757
perror_plus("open");
758
dhparamsfilename = NULL;
759
break;
760
}
761
size_t params_capacity = 0;
762
while(true){
763
params_capacity = incbuffer((char **)¶ms.data,
764
(size_t)params.size,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
768
free(params.data);
769
params.data = NULL;
770
dhparamsfilename = NULL;
771
break;
772
}
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
775
BUFFER_SIZE);
776
/* EOF */
777
if(bytes_read == 0){
778
break;
779
}
780
/* check bytes_read for failure */
781
if(bytes_read < 0){
782
perror_plus("read");
783
free(params.data);
784
params.data = NULL;
785
dhparamsfilename = NULL;
786
break;
787
}
788
params.size += (unsigned int)bytes_read;
789
}
790
ret = close(dhpfile);
791
if(ret == -1){
792
perror_plus("close");
793
}
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
796
}
797
if(dhparamsfilename == NULL){
798
break;
799
}
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
807
}
808
free(params.data);
809
} while(false);
810
}
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
816
do {
817
int secfile = open(seckeyfilename, O_RDONLY);
818
if(secfile == -1){
819
perror_plus("open");
820
break;
821
}
822
size_t buffer_capacity = 0;
823
while(true){
824
buffer_capacity = incbuffer((char **)&buffer.data,
825
(size_t)buffer.size,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
829
free(buffer.data);
830
buffer.data = NULL;
831
break;
832
}
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
835
BUFFER_SIZE);
836
/* EOF */
837
if(bytes_read == 0){
838
break;
839
}
840
/* check bytes_read for failure */
841
if(bytes_read < 0){
842
perror_plus("read");
843
free(buffer.data);
844
buffer.data = NULL;
845
break;
846
}
847
buffer.size += (unsigned int)bytes_read;
848
}
849
close(secfile);
850
} while(false);
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
854
{
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
859
" structure: %s",
860
safer_gnutls_strerror(ret));
861
free(buffer.data);
862
buffer.data = NULL;
863
} else {
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
869
privkey = NULL;
870
}
871
free(buffer.data);
872
buffer.data = NULL;
873
if(privkey != NULL){
874
/* Use private key to suggest an appropriate
875
sec_param */
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
878
if(debug){
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
882
(sec_param)));
883
}
884
}
885
}
886
}
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
890
if(debug){
891
fprintf_plus(stderr, "Falling back to security parameter"
892
" \"%s\"\n",
893
safe_string(gnutls_sec_param_get_name
894
(sec_param)));
895
}
896
}
897
}
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
if(uret != 0){
900
mc->dh_bits = uret;
901
if(debug){
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)),
906
mc->dh_bits);
907
}
908
} else {
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
912
(sec_param)),
913
safer_gnutls_strerror(ret));
914
goto globalfail;
915
}
916
} else if(debug){
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
mc->dh_bits);
919
}
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
925
goto globalfail;
926
}
927
}
928
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
929
528
930
return 0;
529
931
530
932
globalfail:
531
933
532
gnutls_certificate_free_credentials(mc.cred);
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
934
gnutls_certificate_free_credentials(mc->cred);
935
gnutls_dh_params_deinit(mc->dh_params);
535
936
return -1;
536
937
}
537
938
538
static int init_gnutls_session(gnutls_session_t *session){
939
__attribute__((nonnull, warn_unused_result))
940
static int init_gnutls_session(gnutls_session_t *session,
941
mandos_context *mc){
539
942
int ret;
540
943
/* GnuTLS session creation */
541
944
do {
545
948
}
546
949
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
950
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
951
fprintf_plus(stderr,
952
"Error in GnuTLS session initialization: %s\n",
953
safer_gnutls_strerror(ret));
550
954
}
551
955
552
956
{
553
957
const char *err;
554
958
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
959
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
960
if(quit_now){
557
961
gnutls_deinit(*session);
558
962
return -1;
559
963
}
560
964
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
965
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
966
fprintf_plus(stderr, "Syntax error at: %s\n", err);
967
fprintf_plus(stderr, "GnuTLS error: %s\n",
968
safer_gnutls_strerror(ret));
565
969
gnutls_deinit(*session);
566
970
return -1;
567
971
}
569
973
570
974
do {
571
975
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
976
mc->cred);
573
977
if(quit_now){
574
978
gnutls_deinit(*session);
575
979
return -1;
576
980
}
577
981
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
982
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
983
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
984
safer_gnutls_strerror(ret));
581
985
gnutls_deinit(*session);
582
986
return -1;
583
987
}
585
989
/* ignore client certificate if any. */
586
990
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
991
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
590
992
return 0;
591
993
}
592
994
594
996
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
595
997
__attribute__((unused)) const char *txt){}
596
998
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1004
int ret;
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1011
if(debug){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1014
}
1015
return false;
1016
}
1017
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1021
return false;
1022
}
1023
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1025
if(devnull == -1){
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1027
return false;
1028
}
1029
pid_t pid = fork();
1030
if(pid == 0){
1031
/* Child */
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1034
if(errno != 0){
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1037
} else {
1038
/* Set group */
1039
errno = 0;
1040
ret = setgid(0);
1041
if(ret == -1){
1042
perror_plus("setgid");
1043
_exit(EX_NOPERM);
1044
}
1045
/* Reset supplementary groups */
1046
errno = 0;
1047
ret = setgroups(0, NULL);
1048
if(ret == -1){
1049
perror_plus("setgroups");
1050
_exit(EX_NOPERM);
1051
}
1052
}
1053
ret = dup2(devnull, STDIN_FILENO);
1054
if(ret == -1){
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1056
_exit(EX_OSERR);
1057
}
1058
ret = close(devnull);
1059
if(ret == -1){
1060
perror_plus("close");
1061
_exit(EX_OSERR);
1062
}
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
if(ret == -1){
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1066
_exit(EX_OSERR);
1067
}
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1069
O_RDONLY
1070
| O_DIRECTORY
1071
| O_PATH
1072
| O_CLOEXEC));
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1076
}
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1078
helper, O_RDONLY));
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1083
}
1084
close(helperdir_fd);
1085
#ifdef __GNUC__
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1088
#endif
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1092
environ) == -1){
1093
#ifdef __GNUC__
1094
#pragma GCC diagnostic pop
1095
#endif
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1098
}
1099
}
1100
if(pid == -1){
1101
perror_plus("fork");
1102
return false;
1103
}
1104
int status;
1105
pid_t pret = -1;
1106
errno = 0;
1107
do {
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1115
}
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1118
}
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1121
" helper program");
1122
}
1123
return false;
1124
}
1125
} while(pret == -1 and errno == EINTR);
1126
if(pret == -1){
1127
perror_plus("waitpid");
1128
return false;
1129
}
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1134
return false;
1135
}
1136
return true;
1137
}
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1141
return false;
1142
}
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1144
return false;
1145
}
1146
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1150
if(debug){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1152
}
1153
return add_delete_local_route(true, address, if_index);
1154
}
1155
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1159
if(debug){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1161
}
1162
return add_delete_local_route(false, address, if_index);
1163
}
1164
597
1165
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
1166
__attribute__((nonnull, warn_unused_result))
1167
static int start_mandos_communication(const char *ip, in_port_t port,
599
1168
AvahiIfIndex if_index,
600
int af){
1169
int af, mandos_context *mc){
601
1170
int ret, tcp_sd = -1;
602
1171
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
1172
struct sockaddr_storage to;
607
1173
char *buffer = NULL;
608
1174
char *decrypted_buffer = NULL;
609
1175
size_t buffer_length = 0;
612
1178
int retval = -1;
613
1179
gnutls_session_t session;
614
1180
int pf; /* Protocol family */
1181
bool route_added = false;
615
1182
616
1183
errno = 0;
617
1184
628
1195
pf = PF_INET;
629
1196
break;
630
1197
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
1198
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
1199
errno = EINVAL;
633
1200
return -1;
634
1201
}
635
1202
636
ret = init_gnutls_session(&session);
1203
/* If the interface is specified and we have a list of interfaces */
1204
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1205
/* Check if the interface is one of the interfaces we are using */
1206
bool match = false;
1207
{
1208
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
1212
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
match = true;
1214
break;
1215
}
1216
}
1217
}
1218
if(not match){
1219
/* This interface does not match any in the list, so we don't
1220
connect to the server */
1221
if(debug){
1222
char interface[IF_NAMESIZE];
1223
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1224
perror_plus("if_indextoname");
1225
} else {
1226
fprintf_plus(stderr, "Skipping server on non-used interface"
1227
" \"%s\"\n",
1228
if_indextoname((unsigned int)if_index,
1229
interface));
1230
}
1231
}
1232
return -1;
1233
}
1234
}
1235
1236
ret = init_gnutls_session(&session, mc);
637
1237
if(ret != 0){
638
1238
return -1;
639
1239
}
640
1240
641
1241
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
1242
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1243
PRIuMAX "\n", ip, (uintmax_t)port);
644
1244
}
645
1245
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
647
1247
if(tcp_sd < 0){
648
1248
int e = errno;
649
1249
perror_plus("socket");
656
1256
goto mandos_end;
657
1257
}
658
1258
659
memset(&to, 0, sizeof(to));
660
1259
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1260
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1261
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1262
ret = inet_pton(af, ip, &to6->sin6_addr);
663
1263
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
1264
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1265
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1266
ret = inet_pton(af, ip, &to4->sin_addr);
666
1267
}
667
1268
if(ret < 0 ){
668
1269
int e = errno;
672
1273
}
673
1274
if(ret == 0){
674
1275
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
1276
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
1277
errno = e;
677
1278
goto mandos_end;
678
1279
}
679
1280
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
1281
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1282
if(IN6_IS_ADDR_LINKLOCAL
1283
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
1284
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
1285
fprintf_plus(stderr, "An IPv6 link-local address is"
1286
" incomplete without a network interface\n");
690
1287
errno = EINVAL;
691
1288
goto mandos_end;
692
1289
}
693
1290
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
1291
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
1292
}
696
1293
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
1294
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
1295
}
701
1296
702
1297
if(quit_now){
710
1305
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
1306
perror_plus("if_indextoname");
712
1307
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1308
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1309
"\n", ip, interface, (uintmax_t)port);
715
1310
}
716
1311
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1312
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1313
ip, (uintmax_t)port);
719
1314
}
720
1315
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
1316
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1317
if(af == AF_INET6){
1318
ret = getnameinfo((struct sockaddr *)&to,
1319
sizeof(struct sockaddr_in6),
1320
addrstr, sizeof(addrstr), NULL, 0,
1321
NI_NUMERICHOST);
1322
} else {
1323
ret = getnameinfo((struct sockaddr *)&to,
1324
sizeof(struct sockaddr_in),
1325
addrstr, sizeof(addrstr), NULL, 0,
1326
NI_NUMERICHOST);
1327
}
1328
if(ret == EAI_SYSTEM){
1329
perror_plus("getnameinfo");
1330
} else if(ret != 0) {
1331
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1332
} else if(strcmp(addrstr, ip) != 0){
1333
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1334
}
1335
}
1336
1337
if(quit_now){
1338
errno = EINTR;
1339
goto mandos_end;
1340
}
1341
1342
while(true){
1343
if(af == AF_INET6){
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1346
} else {
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1349
}
1350
if(ret < 0){
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1357
&to)->sin6_addr)))
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1368
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1372
*/
1373
if(debug){
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1375
" direct route\n");
1376
}
1377
int e = errno;
1378
route_added = add_local_route(ip, if_index);
1379
if(route_added){
1380
continue;
1381
}
1382
errno = e;
1383
}
1384
if(errno != ECONNREFUSED or debug){
1385
int e = errno;
1386
perror_plus("connect");
1387
errno = e;
1388
}
1389
goto mandos_end;
1390
}
1391
1392
if(quit_now){
1393
errno = EINTR;
1394
goto mandos_end;
1395
}
1396
break;
761
1397
}
762
1398
763
1399
const char *out = mandos_protocol_version;
765
1401
while(true){
766
1402
size_t out_size = strlen(out);
767
1403
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
1404
out_size - written));
769
1405
if(ret == -1){
770
1406
int e = errno;
771
1407
perror_plus("write");
791
1427
}
792
1428
793
1429
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1430
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
1431
}
796
1432
797
1433
if(quit_now){
799
1435
goto mandos_end;
800
1436
}
801
1437
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1438
/* This casting via intptr_t is to eliminate warning about casting
1439
an int to a pointer type. This is exactly how the GnuTLS Guile
1440
function "set-session-transport-fd!" does it. */
1441
gnutls_transport_set_ptr(session,
1442
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
1443
805
1444
if(quit_now){
806
1445
errno = EINTR;
817
1456
818
1457
if(ret != GNUTLS_E_SUCCESS){
819
1458
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1459
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
1460
gnutls_perror(ret);
822
1461
}
823
1462
errno = EPROTO;
827
1466
/* Read OpenPGP packet that contains the wanted password */
828
1467
829
1468
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1469
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1470
" %s\n", ip);
832
1471
}
833
1472
834
1473
while(true){
839
1478
}
840
1479
841
1480
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
1481
buffer_capacity);
843
1482
if(buffer_capacity == 0){
844
1483
int e = errno;
845
1484
perror_plus("incbuffer");
872
1511
}
873
1512
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
1513
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1514
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1515
"***\n");
876
1516
gnutls_perror(ret);
877
1517
errno = EPROTO;
878
1518
goto mandos_end;
879
1519
}
880
1520
break;
881
1521
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1522
fprintf_plus(stderr, "Unknown error while reading data from"
1523
" encrypted session with Mandos server\n");
884
1524
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
1525
errno = EIO;
886
1526
goto mandos_end;
891
1531
}
892
1532
893
1533
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
1534
fprintf_plus(stderr, "Closing TLS session\n");
895
1535
}
896
1536
897
1537
if(quit_now){
909
1549
910
1550
if(buffer_length > 0){
911
1551
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1552
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1553
&decrypted_buffer, mc);
915
1554
if(decrypted_buffer_size >= 0){
916
1555
1556
clearerr(stdout);
917
1557
written = 0;
918
1558
while(written < (size_t) decrypted_buffer_size){
919
1559
if(quit_now){
927
1567
if(ret == 0 and ferror(stdout)){
928
1568
int e = errno;
929
1569
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1570
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1571
strerror(errno));
932
1572
}
933
1573
errno = e;
934
1574
goto mandos_end;
935
1575
}
936
1576
written += (size_t)ret;
937
1577
}
1578
ret = fflush(stdout);
1579
if(ret != 0){
1580
int e = errno;
1581
if(debug){
1582
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1583
strerror(errno));
1584
}
1585
errno = e;
1586
goto mandos_end;
1587
}
938
1588
retval = 0;
939
1589
}
940
1590
}
943
1593
944
1594
mandos_end:
945
1595
{
1596
if(route_added){
1597
if(not delete_local_route(ip, if_index)){
1598
fprintf_plus(stderr, "Failed to delete local route to %s on"
1599
" interface %d", ip, if_index);
1600
}
1601
}
946
1602
int e = errno;
947
1603
free(decrypted_buffer);
948
1604
free(buffer);
949
1605
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1606
ret = close(tcp_sd);
951
1607
}
952
1608
if(ret == -1){
953
1609
if(e == 0){
978
1634
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1635
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1636
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1637
void *mc){
1638
if(r == NULL){
1639
return;
1640
}
983
1641
984
1642
/* Called whenever a service has been resolved successfully or
985
1643
timed out */
986
1644
987
1645
if(quit_now){
1646
avahi_s_service_resolver_free(r);
988
1647
return;
989
1648
}
990
1649
991
1650
switch(event){
992
1651
default:
993
1652
case AVAHI_RESOLVER_FAILURE:
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1653
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1654
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1655
domain,
1656
avahi_strerror(avahi_server_errno
1657
(((mandos_context*)mc)->server)));
997
1658
break;
998
1659
999
1660
case AVAHI_RESOLVER_FOUND:
1001
1662
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1663
avahi_address_snprint(ip, sizeof(ip), address);
1003
1664
if(debug){
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1665
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1666
PRIdMAX ") on port %" PRIu16 "\n", name,
1667
host_name, ip, (intmax_t)interface, port);
1007
1668
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1669
int ret = start_mandos_communication(ip, (in_port_t)port,
1670
interface,
1671
avahi_proto_to_af(proto),
1672
mc);
1010
1673
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1674
avahi_simple_poll_quit(simple_poll);
1012
1675
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1676
if(not add_server(ip, (in_port_t)port, interface,
1677
avahi_proto_to_af(proto),
1678
&((mandos_context*)mc)->current_server)){
1679
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1680
" list\n", name);
1681
}
1015
1682
}
1016
1683
}
1017
1684
}
1027
1694
const char *domain,
1028
1695
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1696
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1697
void *mc){
1698
if(b == NULL){
1699
return;
1700
}
1032
1701
1033
1702
/* Called whenever a new services becomes available on the LAN or
1034
1703
is removed from the LAN */
1041
1710
default:
1042
1711
case AVAHI_BROWSER_FAILURE:
1043
1712
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1713
fprintf_plus(stderr, "(Avahi browser) %s\n",
1714
avahi_strerror(avahi_server_errno
1715
(((mandos_context*)mc)->server)));
1716
avahi_simple_poll_quit(simple_poll);
1047
1717
return;
1048
1718
1049
1719
case AVAHI_BROWSER_NEW:
1052
1722
the callback function is called the Avahi server will free the
1053
1723
resolver for us. */
1054
1724
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1725
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1726
interface, protocol, name, type,
1727
domain, protocol, 0,
1728
resolve_callback, mc) == NULL)
1729
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1730
" %s\n", name,
1731
avahi_strerror(avahi_server_errno
1732
(((mandos_context*)mc)->server)));
1060
1733
break;
1061
1734
1062
1735
case AVAHI_BROWSER_REMOVE:
1065
1738
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1739
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1740
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1741
fprintf_plus(stderr, "No Mandos server found, still"
1742
" searching...\n");
1069
1743
}
1070
1744
break;
1071
1745
}
1080
1754
signal_received = sig;
1081
1755
int old_errno = errno;
1082
1756
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1757
if(simple_poll != NULL){
1758
avahi_simple_poll_quit(simple_poll);
1085
1759
}
1086
1760
errno = old_errno;
1087
1761
}
1088
1762
1763
__attribute__((nonnull, warn_unused_result))
1089
1764
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1765
int ret;
1766
int old_errno;
1091
1767
1092
1768
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1769
if(s < 0){
1770
old_errno = errno;
1094
1771
perror_plus("socket");
1772
errno = old_errno;
1095
1773
return false;
1096
1774
}
1097
strcpy(ifr->ifr_name, ifname);
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1098
1777
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1778
if(ret == -1){
1100
1779
if(debug){
1780
old_errno = errno;
1101
1781
perror_plus("ioctl SIOCGIFFLAGS");
1782
errno = old_errno;
1783
}
1784
if((close(s) == -1) and debug){
1785
old_errno = errno;
1786
perror_plus("close");
1787
errno = old_errno;
1102
1788
}
1103
1789
return false;
1104
1790
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1105
1796
return true;
1106
1797
}
1107
1798
1799
__attribute__((nonnull, warn_unused_result))
1108
1800
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1801
1110
1802
/* Reject the loopback device */
1111
1803
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1804
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1805
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1806
ifname);
1115
1807
}
1116
1808
return false;
1117
1809
}
1118
1810
/* Accept point-to-point devices only if connect_to is specified */
1119
1811
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1812
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1813
fprintf_plus(stderr, "Accepting point-to-point interface"
1814
" \"%s\"\n", ifname);
1123
1815
}
1124
1816
return true;
1125
1817
}
1126
1818
/* Otherwise, reject non-broadcast-capable devices */
1127
1819
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1820
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1821
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1822
" \"%s\"\n", ifname);
1131
1823
}
1132
1824
return false;
1133
1825
}
1134
1826
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1827
if(ifr->ifr_flags & IFF_NOARP){
1136
1828
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1829
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1830
ifname);
1138
1831
}
1139
1832
return false;
1140
1833
}
1141
1834
1142
1835
/* Accept this device */
1143
1836
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1837
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1838
}
1146
1839
return true;
1147
1840
}
1151
1844
* corresponds to an acceptable network device.
1152
1845
* (This function is passed to scandir(3) as a filter function.)
1153
1846
*/
1847
__attribute__((nonnull, warn_unused_result))
1154
1848
int good_interface(const struct dirent *if_entry){
1155
int ret;
1156
1849
if(if_entry->d_name[0] == '.'){
1157
1850
return 0;
1158
1851
}
1852
1159
1853
struct ifreq ifr;
1160
1161
1854
if(not get_flags(if_entry->d_name, &ifr)){
1855
if(debug){
1856
fprintf_plus(stderr, "Failed to get flags for interface "
1857
"\"%s\"\n", if_entry->d_name);
1858
}
1162
1859
return 0;
1163
1860
}
1164
1861
1169
1866
}
1170
1867
1171
1868
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1278
}
1279
return 1;
1280
}
1281
1869
* This function determines if a network interface is up.
1870
*/
1871
__attribute__((nonnull, warn_unused_result))
1872
bool interface_is_up(const char *interface){
1873
struct ifreq ifr;
1874
if(not get_flags(interface, &ifr)){
1875
if(debug){
1876
fprintf_plus(stderr, "Failed to get flags for interface "
1877
"\"%s\"\n", interface);
1878
}
1879
return false;
1880
}
1881
1882
return (bool)(ifr.ifr_flags & IFF_UP);
1883
}
1884
1885
/*
1886
* This function determines if a network interface is running
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
bool interface_is_running(const char *interface){
1890
struct ifreq ifr;
1891
if(not get_flags(interface, &ifr)){
1892
if(debug){
1893
fprintf_plus(stderr, "Failed to get flags for interface "
1894
"\"%s\"\n", interface);
1895
}
1896
return false;
1897
}
1898
1899
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1900
}
1901
1902
__attribute__((nonnull, pure, warn_unused_result))
1282
1903
int notdotentries(const struct dirent *direntry){
1283
1904
/* Skip "." and ".." */
1284
1905
if(direntry->d_name[0] == '.'
1291
1912
}
1292
1913
1293
1914
/* Is this directory entry a runnable program? */
1915
__attribute__((nonnull, warn_unused_result))
1294
1916
int runnable_hook(const struct dirent *direntry){
1295
1917
int ret;
1918
size_t sret;
1296
1919
struct stat st;
1297
1920
1298
1921
if((direntry->d_name)[0] == '\0'){
1300
1923
return 0;
1301
1924
}
1302
1925
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1926
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1927
"abcdefghijklmnopqrstuvwxyz"
1928
"0123456789"
1929
"_.-");
1930
if((direntry->d_name)[sret] != '\0'){
1931
/* Contains non-allowed characters */
1932
if(debug){
1933
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1934
direntry->d_name);
1935
}
1936
return 0;
1937
}
1938
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1320
1940
if(ret == -1){
1321
1941
if(debug){
1322
perror_plus("Could not stat plugin");
1942
perror_plus("Could not stat hook");
1323
1943
}
1324
1944
return 0;
1325
1945
}
1326
if(not (st.st_mode & S_ISREG)){
1946
if(not (S_ISREG(st.st_mode))){
1327
1947
/* Not a regular file */
1948
if(debug){
1949
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1950
direntry->d_name);
1951
}
1328
1952
return 0;
1329
1953
}
1330
1954
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
1955
/* Not executable */
1956
if(debug){
1957
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1958
direntry->d_name);
1959
}
1332
1960
return 0;
1333
1961
}
1962
if(debug){
1963
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1964
direntry->d_name);
1965
}
1334
1966
return 1;
1335
1967
}
1336
1968
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1969
__attribute__((nonnull, warn_unused_result))
1970
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
mandos_context *mc){
1338
1972
int ret;
1339
1973
struct timespec now;
1340
1974
struct timespec waited_time;
1341
1975
intmax_t block_time;
1342
1976
1343
1977
while(true){
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1978
if(mc->current_server == NULL){
1979
if(debug){
1980
fprintf_plus(stderr, "Wait until first server is found."
1981
" No timeout!\n");
1348
1982
}
1349
1983
ret = avahi_simple_poll_iterate(s, -1);
1350
1984
} else {
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1985
if(debug){
1986
fprintf_plus(stderr, "Check current_server if we should run"
1987
" it, or wait\n");
1354
1988
}
1355
1989
/* the current time */
1356
1990
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
1995
/* Calculating in ms how long time between now and server
1362
1996
who we visted longest time ago. Now - last seen. */
1363
1997
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1998
- mc->current_server->last_seen.tv_sec);
1365
1999
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
2000
- mc->current_server->last_seen.tv_nsec);
1367
2001
/* total time is 10s/10,000ms.
1368
2002
Converting to s from ms by dividing by 1,000,
1369
2003
and ns to ms by dividing by 1,000,000. */
1371
2005
- ((intmax_t)waited_time.tv_sec * 1000))
1372
2006
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
2007
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
2008
if(debug){
2009
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2010
block_time);
1376
2011
}
1377
2012
1378
2013
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
2014
ret = start_mandos_communication(mc->current_server->ip,
2015
mc->current_server->port,
2016
mc->current_server->if_index,
2017
mc->current_server->af, mc);
1383
2018
if(ret == 0){
1384
avahi_simple_poll_quit(mc.simple_poll);
2019
avahi_simple_poll_quit(s);
1385
2020
return 0;
1386
2021
}
1387
2022
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
2023
&mc->current_server->last_seen);
1389
2024
if(ret == -1){
1390
2025
perror_plus("clock_gettime");
1391
2026
return -1;
1392
2027
}
1393
mc.current_server = mc.current_server->next;
2028
mc->current_server = mc->current_server->next;
1394
2029
block_time = 0; /* Call avahi to find new Mandos
1395
2030
servers, but don't block */
1396
2031
}
1398
2033
ret = avahi_simple_poll_iterate(s, (int)block_time);
1399
2034
}
1400
2035
if(ret != 0){
1401
if (ret > 0 or errno != EINTR) {
2036
if(ret > 0 or errno != EINTR){
1402
2037
return (ret != 1) ? ret : 0;
1403
2038
}
1404
2039
}
1405
2040
}
1406
2041
}
1407
2042
2043
__attribute__((nonnull))
2044
void run_network_hooks(const char *mode, const char *interface,
2045
const float delay){
2046
struct dirent **direntries = NULL;
2047
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
2050
if(hookdir_fd == -1){
2051
if(errno == ENOENT){
2052
if(debug){
2053
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2054
" found\n", hookdir);
2055
}
2056
} else {
2057
perror_plus("open");
2058
}
2059
return;
2060
}
2061
}
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2063
if(devnull == -1){
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2065
return;
2066
}
2067
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
runnable_hook, alphasort);
2069
if(numhooks == -1){
2070
perror_plus("scandir");
2071
close(devnull);
2072
return;
2073
}
2074
struct dirent *direntry;
2075
int ret;
2076
for(int i = 0; i < numhooks; i++){
2077
direntry = direntries[i];
2078
if(debug){
2079
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2080
direntry->d_name);
2081
}
2082
pid_t hook_pid = fork();
2083
if(hook_pid == 0){
2084
/* Child */
2085
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2087
if(errno != 0){
2088
perror_plus("Failed to raise privileges");
2089
_exit(EX_NOPERM);
2090
}
2091
/* Set group */
2092
errno = 0;
2093
ret = setgid(0);
2094
if(ret == -1){
2095
perror_plus("setgid");
2096
_exit(EX_NOPERM);
2097
}
2098
/* Reset supplementary groups */
2099
errno = 0;
2100
ret = setgroups(0, NULL);
2101
if(ret == -1){
2102
perror_plus("setgroups");
2103
_exit(EX_NOPERM);
2104
}
2105
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
if(ret == -1){
2107
perror_plus("setenv");
2108
_exit(EX_OSERR);
2109
}
2110
ret = setenv("DEVICE", interface, 1);
2111
if(ret == -1){
2112
perror_plus("setenv");
2113
_exit(EX_OSERR);
2114
}
2115
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2116
if(ret == -1){
2117
perror_plus("setenv");
2118
_exit(EX_OSERR);
2119
}
2120
ret = setenv("MODE", mode, 1);
2121
if(ret == -1){
2122
perror_plus("setenv");
2123
_exit(EX_OSERR);
2124
}
2125
char *delaystring;
2126
ret = asprintf(&delaystring, "%f", (double)delay);
2127
if(ret == -1){
2128
perror_plus("asprintf");
2129
_exit(EX_OSERR);
2130
}
2131
ret = setenv("DELAY", delaystring, 1);
2132
if(ret == -1){
2133
free(delaystring);
2134
perror_plus("setenv");
2135
_exit(EX_OSERR);
2136
}
2137
free(delaystring);
2138
if(connect_to != NULL){
2139
ret = setenv("CONNECT", connect_to, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
}
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2146
direntry->d_name,
2147
O_RDONLY));
2148
if(hook_fd == -1){
2149
perror_plus("openat");
2150
_exit(EXIT_FAILURE);
2151
}
2152
if(close(hookdir_fd) == -1){
2153
perror_plus("close");
2154
_exit(EXIT_FAILURE);
2155
}
2156
ret = dup2(devnull, STDIN_FILENO);
2157
if(ret == -1){
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2159
_exit(EX_OSERR);
2160
}
2161
ret = close(devnull);
2162
if(ret == -1){
2163
perror_plus("close");
2164
_exit(EX_OSERR);
2165
}
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2167
if(ret == -1){
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2169
_exit(EX_OSERR);
2170
}
2171
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2172
environ) == -1){
2173
perror_plus("fexecve");
2174
_exit(EXIT_FAILURE);
2175
}
2176
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
int status;
2183
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
perror_plus("waitpid");
2185
free(direntry);
2186
continue;
2187
}
2188
if(WIFEXITED(status)){
2189
if(WEXITSTATUS(status) != 0){
2190
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
" with status %d\n", direntry->d_name,
2192
WEXITSTATUS(status));
2193
free(direntry);
2194
continue;
2195
}
2196
} else if(WIFSIGNALED(status)){
2197
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
" signal %d\n", direntry->d_name,
2199
WTERMSIG(status));
2200
free(direntry);
2201
continue;
2202
} else {
2203
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
continue;
2207
}
2208
}
2209
if(debug){
2210
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
direntry->d_name);
2212
}
2213
free(direntry);
2214
}
2215
free(direntries);
2216
if(close(hookdir_fd) == -1){
2217
perror_plus("close");
2218
} else {
2219
hookdir_fd = -1;
2220
}
2221
close(devnull);
2222
}
2223
2224
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
2228
int ret;
2229
struct ifreq network;
2230
unsigned int if_index = if_nametoindex(interface);
2231
if(if_index == 0){
2232
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2233
errno = old_errno;
2234
return ENXIO;
2235
}
2236
2237
if(quit_now){
2238
errno = old_errno;
2239
return EINTR;
2240
}
2241
2242
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network)){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags |= IFF_UP; /* set flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(quit_now){
2263
ret = close(sd);
2264
if(ret == -1){
2265
perror_plus("close");
2266
}
2267
errno = old_errno;
2268
return EINTR;
2269
}
2270
2271
if(debug){
2272
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2273
interface);
2274
}
2275
2276
/* Raise privileges */
2277
ret_errno = raise_privileges();
2278
if(ret_errno != 0){
2279
errno = ret_errno;
2280
perror_plus("Failed to raise privileges");
2281
}
2282
2283
#ifdef __linux__
2284
int ret_linux;
2285
bool restore_loglevel = false;
2286
if(ret_errno == 0){
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2288
messages about the network interface to mess up the prompt */
2289
ret_linux = klogctl(8, NULL, 5);
2290
if(ret_linux == -1){
2291
perror_plus("klogctl");
2292
} else {
2293
restore_loglevel = true;
2294
}
2295
}
2296
#endif /* __linux__ */
2297
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2298
ioctl_errno = errno;
2299
#ifdef __linux__
2300
if(restore_loglevel){
2301
ret_linux = klogctl(7, NULL, 0);
2302
if(ret_linux == -1){
2303
perror_plus("klogctl");
2304
}
2305
}
2306
#endif /* __linux__ */
2307
2308
/* If raise_privileges() succeeded above */
2309
if(ret_errno == 0){
2310
/* Lower privileges */
2311
ret_errno = lower_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to lower privileges");
2315
}
2316
}
2317
2318
/* Close the socket */
2319
ret = close(sd);
2320
if(ret == -1){
2321
perror_plus("close");
2322
}
2323
2324
if(ret_setflags == -1){
2325
errno = ioctl_errno;
2326
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2327
errno = old_errno;
2328
return ioctl_errno;
2329
}
2330
} else if(debug){
2331
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2332
interface);
2333
}
2334
2335
/* Sleep checking until interface is running.
2336
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
2338
if(interface_is_running(interface)){
2339
break;
2340
}
2341
struct timespec sleeptime = { .tv_nsec = 250000000 };
2342
ret = nanosleep(&sleeptime, NULL);
2343
if(ret == -1 and errno != EINTR){
2344
perror_plus("nanosleep");
2345
}
2346
}
2347
2348
errno = old_errno;
2349
return 0;
2350
}
2351
2352
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
2355
struct ifreq network;
2356
unsigned int if_index = if_nametoindex(interface);
2357
if(if_index == 0){
2358
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2359
errno = old_errno;
2360
return ENXIO;
2361
}
2362
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
2365
if(not get_flags(interface, &network) and debug){
2366
ret_errno = errno;
2367
fprintf_plus(stderr, "Failed to get flags for interface "
2368
"\"%s\"\n", interface);
2369
errno = old_errno;
2370
return ret_errno;
2371
}
2372
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2373
2374
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2375
if(sd == -1){
2376
ret_errno = errno;
2377
perror_plus("socket");
2378
errno = old_errno;
2379
return ret_errno;
2380
}
2381
2382
if(debug){
2383
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2384
interface);
2385
}
2386
2387
/* Raise privileges */
2388
ret_errno = raise_privileges();
2389
if(ret_errno != 0){
2390
errno = ret_errno;
2391
perror_plus("Failed to raise privileges");
2392
}
2393
2394
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2395
ioctl_errno = errno;
2396
2397
/* If raise_privileges() succeeded above */
2398
if(ret_errno == 0){
2399
/* Lower privileges */
2400
ret_errno = lower_privileges();
2401
if(ret_errno != 0){
2402
errno = ret_errno;
2403
perror_plus("Failed to lower privileges");
2404
}
2405
}
2406
2407
/* Close the socket */
2408
int ret = close(sd);
2409
if(ret == -1){
2410
perror_plus("close");
2411
}
2412
2413
if(ret_setflags == -1){
2414
errno = ioctl_errno;
2415
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2416
errno = old_errno;
2417
return ioctl_errno;
2418
}
2419
} else if(debug){
2420
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2421
interface);
2422
}
2423
2424
errno = old_errno;
2425
return 0;
2426
}
2427
1408
2428
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
1409
2434
AvahiSServiceBrowser *sb = NULL;
1410
int error;
2435
error_t ret_errno;
1411
2436
int ret;
1412
2437
intmax_t tmpmax;
1413
2438
char *tmp;
1414
2439
int exitcode = EXIT_SUCCESS;
1415
const char *interface = "";
1416
struct ifreq network;
1417
int sd = -1;
1418
bool take_down_interface = false;
1419
uid_t uid;
1420
gid_t gid;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
2440
char *interfaces_to_take_down = NULL;
2441
size_t interfaces_to_take_down_size = 0;
2442
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2443
char old_tempdir[] = "/tmp/mandosXXXXXX";
2444
char *tempdir = NULL;
1423
2445
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1424
2446
const char *seckey = PATHDIR "/" SECKEY;
1425
2447
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
char *interfaces_hooks = NULL;
1426
2450
1427
2451
bool gnutls_initialized = false;
1428
2452
bool gpgme_initialized = false;
1480
2504
.doc = "Bit length of the prime number used in the"
1481
2505
" Diffie-Hellman key exchange",
1482
2506
.group = 2 },
2507
{ .name = "dh-params", .key = 134,
2508
.arg = "FILE",
2509
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2510
" for the Diffie-Hellman key exchange",
2511
.group = 2 },
1483
2512
{ .name = "priority", .key = 130,
1484
2513
.arg = "STRING",
1485
2514
.doc = "GnuTLS priority string for the TLS handshake",
1490
2519
.group = 2 },
1491
2520
{ .name = "retry", .key = 132,
1492
2521
.arg = "SECONDS",
1493
.doc = "Retry interval used when denied by the mandos server",
2522
.doc = "Retry interval used when denied by the Mandos server",
2523
.group = 2 },
2524
{ .name = "network-hook-dir", .key = 133,
2525
.arg = "DIR",
2526
.doc = "Directory where network hooks are located",
1494
2527
.group = 2 },
1495
2528
/*
1496
2529
* These reproduce what we would get without ARGP_NO_HELP
1515
2548
connect_to = arg;
1516
2549
break;
1517
2550
case 'i': /* --interface */
1518
interface = arg;
2551
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2552
arg, (int)',');
2553
if(ret_errno != 0){
2554
argp_error(state, "%s", strerror(ret_errno));
2555
}
1519
2556
break;
1520
2557
case 's': /* --seckey */
1521
2558
seckey = arg;
1532
2569
}
1533
2570
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1534
2571
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
1535
2575
case 130: /* --priority */
1536
2576
mc.priority = arg;
1537
2577
break;
1550
2590
argp_error(state, "Bad retry interval");
1551
2591
}
1552
2592
break;
2593
case 133: /* --network-hook-dir */
2594
hookdir = arg;
2595
break;
1553
2596
/*
1554
2597
* These reproduce what we would get without ARGP_NO_HELP
1555
2598
*/
1561
2604
argp_state_help(state, state->out_stream,
1562
2605
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1563
2606
case 'V': /* --version */
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
2607
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1565
2608
exit(argp_err_exit_status);
1566
2609
break;
1567
2610
default:
1574
2617
.args_doc = "",
1575
2618
.doc = "Mandos client -- Get and decrypt"
1576
2619
" passwords from a Mandos server" };
1577
ret = argp_parse(&argp, argc, argv,
1578
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1579
switch(ret){
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
1580
2623
case 0:
1581
2624
break;
1582
2625
case ENOMEM:
1583
2626
default:
1584
errno = ret;
2627
errno = ret_errno;
1585
2628
perror_plus("argp_parse");
1586
2629
exitcode = EX_OSERR;
1587
2630
goto end;
1590
2633
goto end;
1591
2634
}
1592
2635
}
1593
2636
1594
2637
{
1595
2638
/* Work around Debian bug #633582:
1596
<http://bugs.debian.org/633582> */
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
2639
<https://bugs.debian.org/633582> */
2640
2641
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2645
perror_plus("Failed to raise privileges");
2646
} else {
2647
struct stat st;
2648
2649
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2650
int seckey_fd = open(seckey, O_RDONLY);
2651
if(seckey_fd == -1){
2652
perror_plus("open");
2653
} else {
2654
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2655
if(ret == -1){
2656
perror_plus("fstat");
2657
} else {
2658
if(S_ISREG(st.st_mode)
2659
and st.st_uid == 0 and st.st_gid == 0){
2660
ret = fchown(seckey_fd, uid, gid);
2661
if(ret == -1){
2662
perror_plus("fchown");
2663
}
2664
}
2665
}
2666
close(seckey_fd);
2667
}
2668
}
2669
2670
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
int pubkey_fd = open(pubkey, O_RDONLY);
2672
if(pubkey_fd == -1){
2673
perror_plus("open");
2674
} else {
2675
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2676
if(ret == -1){
2677
perror_plus("fstat");
2678
} else {
2679
if(S_ISREG(st.st_mode)
2680
and st.st_uid == 0 and st.st_gid == 0){
2681
ret = fchown(pubkey_fd, uid, gid);
2682
if(ret == -1){
2683
perror_plus("fchown");
2684
}
2685
}
2686
}
2687
close(pubkey_fd);
2688
}
2689
}
2690
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2696
} else {
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2698
if(ret == -1){
2699
perror_plus("fstat");
2700
} else {
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2704
if(ret == -1){
2705
perror_plus("fchown");
2706
}
2707
}
2708
}
2709
close(dhparams_fd);
2710
}
2711
}
2712
2713
/* Lower privileges */
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to lower privileges");
2718
}
2719
}
2720
}
2721
2722
/* Remove invalid interface names (except "none") */
2723
{
2724
char *interface = NULL;
2725
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2726
interface))){
2727
if(strcmp(interface, "none") != 0
2728
and if_nametoindex(interface) == 0){
2729
if(interface[0] != '\0'){
2730
fprintf_plus(stderr, "Not using nonexisting interface"
2731
" \"%s\"\n", interface);
2732
}
2733
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2734
interface = NULL;
2735
}
2736
}
2737
}
2738
2739
/* Run network hooks */
2740
{
2741
if(mc.interfaces != NULL){
2742
interfaces_hooks = malloc(mc.interfaces_size);
2743
if(interfaces_hooks == NULL){
2744
perror_plus("malloc");
1685
2745
goto end;
1686
2746
}
2747
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1687
2749
}
1688
close(devnull);
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
1689
2752
}
1690
2753
1691
2754
if(not debug){
1692
2755
avahi_set_log_function(empty_log);
1693
2756
}
1694
2757
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1698
alphasort);
1699
if(ret >= 1){
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1702
if(debug){
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
}
1705
if(interface == NULL){
1706
perror_plus("malloc");
1707
free(direntries);
1708
exitcode = EXIT_FAILURE;
1709
goto end;
1710
}
1711
free(direntries);
1712
} else {
1713
free(direntries);
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1716
goto end;
1717
}
1718
}
1719
1720
2758
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1721
2759
from the signal handler */
1722
2760
/* Initialize the pseudo-RNG for Avahi */
1723
2761
srand((unsigned int) time(NULL));
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2762
simple_poll = avahi_simple_poll_new();
2763
if(simple_poll == NULL){
2764
fprintf_plus(stderr,
2765
"Avahi: Failed to create simple poll object.\n");
1727
2766
exitcode = EX_UNAVAILABLE;
1728
2767
goto end;
1729
2768
}
1791
2830
}
1792
2831
}
1793
2832
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1799
exitcode = EX_UNAVAILABLE;
1800
goto end;
1801
}
1802
1803
if(quit_now){
1804
goto end;
1805
}
1806
1807
/* Re-raise priviliges */
1808
errno = 0;
1809
ret = seteuid(0);
1810
if(ret == -1){
1811
perror_plus("seteuid");
1812
}
1813
1814
#ifdef __linux__
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1819
if(ret == -1){
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1822
}
1823
#endif /* __linux__ */
1824
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1826
if(sd < 0){
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1829
#ifdef __linux__
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1832
if(ret == -1){
1833
perror_plus("klogctl");
1834
}
1835
}
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1838
errno = 0;
1839
ret = seteuid(uid);
1840
if(ret == -1){
1841
perror_plus("seteuid");
1842
}
1843
goto end;
1844
}
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1847
if(ret == -1){
1848
perror_plus("ioctl SIOCGIFFLAGS");
1849
#ifdef __linux__
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1852
if(ret == -1){
1853
perror_plus("klogctl");
1854
}
1855
}
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1859
errno = 0;
1860
ret = seteuid(uid);
1861
if(ret == -1){
1862
perror_plus("seteuid");
1863
}
1864
goto end;
1865
}
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1870
if(ret == -1){
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1874
#ifdef __linux__
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1877
if(ret == -1){
1878
perror_plus("klogctl");
2833
/* If no interfaces were specified, make a list */
2834
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2836
/* Look for any good interfaces */
2837
ret = scandir(sys_class_net, &direntries, good_interface,
2838
alphasort);
2839
if(ret >= 1){
2840
/* Add all found interfaces to interfaces list */
2841
for(int i = 0; i < ret; ++i){
2842
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2843
direntries[i]->d_name);
2844
if(ret_errno != 0){
2845
errno = ret_errno;
2846
perror_plus("argz_add");
2847
free(direntries[i]);
2848
continue;
2849
}
2850
if(debug){
2851
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
direntries[i]->d_name);
2853
}
2854
free(direntries[i]);
2855
}
2856
free(direntries);
2857
} else {
2858
if(ret == 0){
2859
free(direntries);
2860
}
2861
fprintf_plus(stderr, "Could not find a network interface\n");
2862
exitcode = EXIT_FAILURE;
2863
goto end;
2864
}
2865
}
2866
2867
/* Bring up interfaces which are down, and remove any "none"s */
2868
{
2869
char *interface = NULL;
2870
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2871
interface))){
2872
/* If interface name is "none", stop bringing up interfaces.
2873
Also remove all instances of "none" from the list */
2874
if(strcmp(interface, "none") == 0){
2875
argz_delete(&mc.interfaces, &mc.interfaces_size,
2876
interface);
2877
interface = NULL;
2878
while((interface = argz_next(mc.interfaces,
2879
mc.interfaces_size, interface))){
2880
if(strcmp(interface, "none") == 0){
2881
argz_delete(&mc.interfaces, &mc.interfaces_size,
2882
interface);
2883
interface = NULL;
1879
2884
}
1880
2885
}
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1883
errno = 0;
1884
ret = seteuid(uid);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
goto end;
1889
}
1890
}
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1895
if(ret == -1){
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1898
2886
break;
1899
2887
}
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1904
}
1905
}
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
}
1913
#ifdef __linux__
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1917
if(ret == -1){
1918
perror_plus("klogctl");
1919
}
1920
}
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1923
errno = 0;
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
} else {
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
1936
}
2888
bool interface_was_up = interface_is_up(interface);
2889
errno = bring_up_interface(interface, delay);
2890
if(not interface_was_up){
2891
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2894
} else {
2895
errno = argz_add(&interfaces_to_take_down,
2896
&interfaces_to_take_down_size,
2897
interface);
2898
if(errno != 0){
2899
perror_plus("argz_add");
2900
}
2901
}
2902
}
2903
}
2904
if(debug and (interfaces_to_take_down == NULL)){
2905
fprintf_plus(stderr, "No interfaces were brought up\n");
2906
}
2907
}
2908
2909
/* If we only got one interface, explicitly use only that one */
2910
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2911
if(debug){
2912
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2913
mc.interfaces);
2914
}
2915
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1937
2916
}
1938
2917
1939
2918
if(quit_now){
1940
2919
goto end;
1941
2920
}
1942
2921
1943
ret = init_gnutls_global(pubkey, seckey);
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1944
2923
if(ret == -1){
1945
fprintf(stderr, "init_gnutls_global failed\n");
2924
fprintf_plus(stderr, "init_gnutls_global failed\n");
1946
2925
exitcode = EX_UNAVAILABLE;
1947
2926
goto end;
1948
2927
} else {
1953
2932
goto end;
1954
2933
}
1955
2934
1956
if(mkdtemp(tempdir) == NULL){
2935
/* Try /run/tmp before /tmp */
2936
tempdir = mkdtemp(run_tempdir);
2937
if(tempdir == NULL and errno == ENOENT){
2938
if(debug){
2939
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2940
run_tempdir, old_tempdir);
2941
}
2942
tempdir = mkdtemp(old_tempdir);
2943
}
2944
if(tempdir == NULL){
1957
2945
perror_plus("mkdtemp");
1958
2946
goto end;
1959
2947
}
1960
tempdir_created = true;
1961
2948
1962
2949
if(quit_now){
1963
2950
goto end;
1964
2951
}
1965
2952
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1967
fprintf(stderr, "init_gpgme failed\n");
2953
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2954
fprintf_plus(stderr, "init_gpgme failed\n");
1968
2955
exitcode = EX_UNAVAILABLE;
1969
2956
goto end;
1970
2957
} else {
1979
2966
/* Connect directly, do not use Zeroconf */
1980
2967
/* (Mainly meant for debugging) */
1981
2968
char *address = strrchr(connect_to, ':');
2969
1982
2970
if(address == NULL){
1983
fprintf(stderr, "No colon in address\n");
2971
fprintf_plus(stderr, "No colon in address\n");
1984
2972
exitcode = EX_USAGE;
1985
2973
goto end;
1986
2974
}
1989
2977
goto end;
1990
2978
}
1991
2979
1992
uint16_t port;
2980
in_port_t port;
1993
2981
errno = 0;
1994
2982
tmpmax = strtoimax(address+1, &tmp, 10);
1995
2983
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1996
or tmpmax != (uint16_t)tmpmax){
1997
fprintf(stderr, "Bad port number\n");
2984
or tmpmax != (in_port_t)tmpmax){
2985
fprintf_plus(stderr, "Bad port number\n");
1998
2986
exitcode = EX_USAGE;
1999
2987
goto end;
2000
2988
}
2001
2989
2002
2990
if(quit_now){
2003
2991
goto end;
2004
2992
}
2005
2993
2006
port = (uint16_t)tmpmax;
2994
port = (in_port_t)tmpmax;
2007
2995
*address = '\0';
2008
2996
/* Colon in address indicates IPv6 */
2009
2997
int af;
2025
3013
}
2026
3014
2027
3015
while(not quit_now){
2028
ret = start_mandos_communication(address, port, if_index, af);
3016
ret = start_mandos_communication(address, port, if_index, af,
3017
&mc);
2029
3018
if(quit_now or ret == 0){
2030
3019
break;
2031
3020
}
2032
3021
if(debug){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
3022
fprintf_plus(stderr, "Retrying in %d seconds\n",
3023
(int)retry_interval);
2035
3024
}
2036
sleep((int)retry_interval);
3025
sleep((unsigned int)retry_interval);
2037
3026
}
2038
3027
2039
if (not quit_now){
3028
if(not quit_now){
2040
3029
exitcode = EXIT_SUCCESS;
2041
3030
}
2042
3031
2057
3046
config.publish_domain = 0;
2058
3047
2059
3048
/* Allocate a new server */
2060
mc.server = avahi_server_new(avahi_simple_poll_get
2061
(mc.simple_poll), &config, NULL,
2062
NULL, &error);
3049
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
2063
3051
2064
3052
/* Free the Avahi configuration data */
2065
3053
avahi_server_config_free(&config);
2067
3055
2068
3056
/* Check if creating the Avahi server object succeeded */
2069
3057
if(mc.server == NULL){
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
3058
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
2072
3060
exitcode = EX_UNAVAILABLE;
2073
3061
goto end;
2074
3062
}
2080
3068
/* Create the Avahi service browser */
2081
3069
sb = avahi_s_service_browser_new(mc.server, if_index,
2082
3070
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2083
NULL, 0, browse_callback, NULL);
3071
NULL, 0, browse_callback,
3072
(void *)&mc);
2084
3073
if(sb == NULL){
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
3074
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3075
avahi_strerror(avahi_server_errno(mc.server)));
2087
3076
exitcode = EX_UNAVAILABLE;
2088
3077
goto end;
2089
3078
}
2095
3084
/* Run the main loop */
2096
3085
2097
3086
if(debug){
2098
fprintf(stderr, "Starting Avahi loop search\n");
3087
fprintf_plus(stderr, "Starting Avahi loop search\n");
2099
3088
}
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
3089
3090
ret = avahi_loop_with_timeout(simple_poll,
3091
(int)(retry_interval * 1000), &mc);
2103
3092
if(debug){
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
3093
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3094
(ret == 0) ? "successfully" : "with error");
2106
3095
}
2107
3096
2108
3097
end:
2109
3098
2110
3099
if(debug){
2111
fprintf(stderr, "%s exiting\n", argv[0]);
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3104
} else {
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3106
}
2112
3107
}
2113
3108
2114
3109
/* Cleanup things */
3110
free(mc.interfaces);
3111
2115
3112
if(sb != NULL)
2116
3113
avahi_s_service_browser_free(sb);
2117
3114
2118
3115
if(mc.server != NULL)
2119
3116
avahi_server_free(mc.server);
2120
3117
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
3118
if(simple_poll != NULL)
3119
avahi_simple_poll_free(simple_poll);
2123
3120
2124
3121
if(gnutls_initialized){
2125
3122
gnutls_certificate_free_credentials(mc.cred);
2126
gnutls_global_deinit();
2127
3123
gnutls_dh_params_deinit(mc.dh_params);
2128
3124
}
2129
3125
2130
3126
if(gpgme_initialized){
2131
3127
gpgme_release(mc.ctx);
2132
3128
}
2133
3129
2134
3130
/* Cleans up the circular linked list of Mandos servers the client
2135
3131
has seen */
2136
3132
if(mc.current_server != NULL){
2137
3133
mc.current_server->prev->next = NULL;
2138
3134
while(mc.current_server != NULL){
2139
3135
server *next = mc.current_server->next;
3136
#ifdef __GNUC__
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3139
#endif
3140
free((char *)(mc.current_server->ip));
3141
#ifdef __GNUC__
3142
#pragma GCC diagnostic pop
3143
#endif
2140
3144
free(mc.current_server);
2141
3145
mc.current_server = next;
2142
3146
}
2143
3147
}
2144
3148
2145
/* XXX run network hooks "stop" here */
2146
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2150
errno = 0;
2151
ret = seteuid(0);
2152
if(ret == -1){
2153
perror_plus("seteuid");
2154
}
2155
if(geteuid() == 0){
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2164
}
2165
}
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
if(ret == -1){
2168
perror_plus("close");
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
2176
}
3149
/* Re-raise privileges */
3150
{
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
3154
perror_plus("Failed to raise privileges");
3155
} else {
3156
3157
/* Run network hooks */
3158
run_network_hooks("stop", interfaces_hooks != NULL ?
3159
interfaces_hooks : "", delay);
3160
3161
/* Take down the network interfaces which were brought up */
3162
{
3163
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3166
interface))){
3167
ret = take_down_interface(interface);
3168
if(ret != 0){
3169
errno = ret;
3170
perror_plus("Failed to take down interface");
3171
}
3172
}
3173
if(debug and (interfaces_to_take_down == NULL)){
3174
fprintf_plus(stderr, "No interfaces needed to be taken"
3175
" down\n");
3176
}
3177
}
3178
}
3179
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
3183
perror_plus("Failed to lower privileges permanently");
3184
}
3185
}
3186
3187
free(interfaces_to_take_down);
3188
free(interfaces_hooks);
3189
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
3192
struct dirent **direntries = NULL;
3193
int dret;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3195
O_RDONLY
3196
| O_NOFOLLOW
3197
| O_DIRECTORY
3198
| O_PATH));
3199
if(dir_fd == -1){
3200
perror_plus("open");
3201
return;
3202
}
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
3206
for(int i = 0; i < numentries; i++){
3207
if(debug){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3210
}
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3212
if(dret == -1){
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3215
AT_REMOVEDIR);
3216
}
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3222
dret = 0;
3223
}
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3227
}
3228
}
3229
free(direntries[i]);
3230
}
3231
3232
/* need to clean even if 0 because man page doesn't specify */
3233
free(direntries);
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3237
}
3238
} else {
3239
perror_plus("scandirat");
3240
}
3241
close(dir_fd);
2177
3242
}
2178
3243
2179
3244
/* Removes the GPGME temp directory and all files inside */
2180
if(tempdir_created){
2181
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
alphasort);
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
2188
char *fullname = NULL;
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
2190
direntry->d_name);
2191
if(ret < 0){
2192
perror_plus("asprintf");
2193
continue;
2194
}
2195
ret = remove(fullname);
2196
if(ret == -1){
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2198
strerror(errno));
2199
}
2200
free(fullname);
2201
}
2202
}
2203
2204
/* need to clean even if 0 because man page doesn't specify */
2205
free(direntries);
2206
if (numentries == -1){
2207
perror_plus("scandir");
2208
}
2209
ret = rmdir(tempdir);
2210
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
2212
}
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2213
3247
}
2214
3248
2215
3249
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0