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237.7.499
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2018-08-15 09:26:02 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 368.
- Revision ID: teddy@recompile.se-20180815092602-xoyb5s6gf8376i7u
mandos-client: Set system clock if necessary
* plugins.d/mandos-client.c (init_gpgme/import_key): If the system
clock is not set, or set to january 1970, set the system clock to
the more plausible value that is the mtime of the key file. This is
required by GnuPG to be able to import the keys. (We can't pass the
--ignore-time-conflict or the --ignore-valid-from options though
GPGME.)
* plugins.d/mandos-client.c (init_gpgme/import_key): If the system
clock is not set, or set to january 1970, set the system clock to
the more plausible value that is the mtime of the key file. This is
required by GnuPG to be able to import the keys. (We can't pass the
--ignore-time-conflict or the --ignore-valid-from options though
GPGME.)
- 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
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
31
32
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
54
56
SOCK_STREAM, uid_t, gid_t, open(),
55
57
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
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*/
62
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
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EHOSTUNREACH, ECONNREFUSED, EPROTO,
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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
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program_invocation_short_name */
67
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#include <time.h> /* nanosleep(), time(), sleep() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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*/
74
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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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() */
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#include <iso646.h> /* not, or, and */
79
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
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raise() */
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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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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(),
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argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
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EAI_SYSTEM, gai_strerror() */
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#ifdef __linux__
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#include <sys/klog.h> /* klogctl() */
108
124
init_gnutls_session(),
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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
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/* GPGME */
115
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#include <gpgme.h> /* All GPGME types, constants and
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139
#define PATHDIR "/conf/conf.d/mandos"
124
140
#define SECKEY "seckey.txt"
125
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
143
127
144
bool debug = false;
128
145
static const char mandos_protocol_version[] = "1";
129
146
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
148
static const char sys_class_net[] = "/sys/class/net";
132
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;
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/* Doubly linked list that need to be circularly linked when used */
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typedef struct server{
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const char *ip;
137
uint16_t port;
158
in_port_t port;
138
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AvahiIfIndex if_index;
139
160
int af;
140
161
struct timespec last_seen;
144
165
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/* Used for passing in values through the Avahi callback functions */
146
167
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
168
AvahiServer *server;
149
169
gnutls_certificate_credentials_t cred;
150
170
unsigned int dh_bits;
152
172
const char *priority;
153
173
gpgme_ctx_t ctx;
154
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
155
177
} mandos_context;
156
178
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
162
181
163
182
sig_atomic_t quit_now = 0;
164
183
int signal_received = 0;
165
184
166
185
/* Function to use when printing errors */
167
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void perror_plus(const char *print_text){
187
int e = errno;
168
188
fprintf(stderr, "Mandos plugin %s: ",
169
189
program_invocation_short_name);
190
errno = e;
170
191
perror(print_text);
171
192
}
172
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
173
204
/*
174
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
206
* bytes. "buffer_capacity" is how much is currently allocated,
176
207
* "buffer_length" is how much is already used.
177
208
*/
209
__attribute__((nonnull, warn_unused_result))
178
210
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
211
size_t buffer_capacity){
180
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
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;
183
219
return 0;
184
220
}
221
*buffer = new_buf;
185
222
buffer_capacity += BUFFER_SIZE;
186
223
}
187
224
return buffer_capacity;
188
225
}
189
226
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
227
/* Add server to set of servers to retry periodically */
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){
193
231
int ret;
194
232
server *new_server = malloc(sizeof(server));
195
233
if(new_server == NULL){
196
234
perror_plus("malloc");
197
return -1;
235
return false;
198
236
}
199
237
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
238
.port = port,
239
.if_index = if_index,
240
.af = af };
203
241
if(new_server->ip == NULL){
204
242
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
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;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
209
262
new_server->next = new_server;
210
263
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
264
*current_server = new_server;
213
265
} else {
214
new_server->next = mc.current_server;
215
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;
216
269
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
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;
225
325
}
226
326
227
327
/*
228
328
* Initialize GPGME.
229
329
*/
230
static bool init_gpgme(const char *seckey,
231
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){
232
335
gpgme_error_t rc;
233
336
gpgme_engine_info_t engine_info;
234
337
235
236
338
/*
237
339
* Helper function to insert pub and seckey to the engine keyring.
238
340
*/
239
bool import_key(const char *filename){
341
bool import_key(const char * const filename){
240
342
int ret;
241
343
int fd;
242
344
gpgme_data_t pgp_data;
247
349
return false;
248
350
}
249
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
250
402
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
403
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
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));
254
406
return false;
255
407
}
256
408
257
rc = gpgme_op_import(mc.ctx, pgp_data);
409
rc = gpgme_op_import(mc->ctx, pgp_data);
258
410
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
411
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
261
413
return false;
262
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
}
263
490
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
491
ret = close(fd);
265
492
if(ret == -1){
266
493
perror_plus("close");
267
494
}
270
497
}
271
498
272
499
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
500
fprintf_plus(stderr, "Initializing GPGME\n");
274
501
}
275
502
276
503
/* Init GPGME */
277
504
gpgme_check_version(NULL);
278
505
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
506
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
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));
282
509
return false;
283
510
}
284
511
285
/* Set GPGME home directory for the OpenPGP engine only */
512
/* Set GPGME home directory for the OpenPGP engine only */
286
513
rc = gpgme_get_engine_info(&engine_info);
287
514
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
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));
290
517
return false;
291
518
}
292
519
while(engine_info != NULL){
298
525
engine_info = engine_info->next;
299
526
}
300
527
if(engine_info == NULL){
301
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);
302
530
return false;
303
531
}
304
532
305
533
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
534
rc = gpgme_new(&(mc->ctx));
307
535
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
310
538
return false;
311
539
}
312
540
321
549
* Decrypt OpenPGP data.
322
550
* Returns -1 on error
323
551
*/
552
__attribute__((nonnull, warn_unused_result))
324
553
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
554
size_t crypto_size,
326
char **plaintext){
555
char **plaintext,
556
mandos_context *mc){
327
557
gpgme_data_t dh_crypto, dh_plain;
328
558
gpgme_error_t rc;
329
559
ssize_t ret;
331
561
ssize_t plaintext_length = 0;
332
562
333
563
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
564
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
565
}
336
566
337
567
/* Create new GPGME data buffer from memory cryptotext */
338
568
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
569
0);
340
570
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
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));
343
573
return -1;
344
574
}
345
575
346
576
/* Create new empty GPGME data buffer for the plaintext */
347
577
rc = gpgme_data_new(&dh_plain);
348
578
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
351
581
gpgme_data_release(dh_crypto);
352
582
return -1;
353
583
}
354
584
355
585
/* Decrypt data from the cryptotext data buffer to the plaintext
356
586
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
587
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
588
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
589
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
590
gpgme_strsource(rc), gpgme_strerror(rc));
361
591
plaintext_length = -1;
362
592
if(debug){
363
593
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
594
result = gpgme_op_decrypt_result(mc->ctx);
365
595
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
596
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
597
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
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");
372
604
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
605
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
606
}
375
gpgme_recipient_t recipient;
376
recipient = result->recipients;
377
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
384
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");
385
615
}
386
616
}
387
617
}
389
619
}
390
620
391
621
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
622
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
623
}
394
624
395
625
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
632
*plaintext = NULL;
403
633
while(true){
404
634
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
635
(size_t)plaintext_length,
636
plaintext_capacity);
407
637
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
638
perror_plus("incbuffer");
639
plaintext_length = -1;
640
goto decrypt_end;
411
641
}
412
642
413
643
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
656
}
427
657
428
658
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
659
fprintf_plus(stderr, "Decrypted password is: ");
430
660
for(ssize_t i = 0; i < plaintext_length; i++){
431
661
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
662
}
443
673
return plaintext_length;
444
674
}
445
675
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
449
if(ret == NULL)
450
ret = "(unknown)";
451
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);
452
687
}
453
688
454
689
/* GnuTLS log function callback */
690
__attribute__((nonnull))
455
691
static void debuggnutls(__attribute__((unused)) int level,
456
692
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
693
fprintf_plus(stderr, "GnuTLS: %s", string);
458
694
}
459
695
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
460
697
static int init_gnutls_global(const char *pubkeyfilename,
461
const char *seckeyfilename){
698
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
mandos_context *mc){
462
701
int ret;
702
unsigned int uret;
463
703
464
704
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
466
}
467
468
ret = gnutls_global_init();
469
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
472
return -1;
705
fprintf_plus(stderr, "Initializing GnuTLS\n");
473
706
}
474
707
475
708
if(debug){
481
714
}
482
715
483
716
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
717
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
718
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
719
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
safer_gnutls_strerror(ret));
489
721
return -1;
490
722
}
491
723
492
724
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
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);
496
729
}
497
730
498
731
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
732
(mc->cred, pubkeyfilename, seckeyfilename,
500
733
GNUTLS_OPENPGP_FMT_BASE64);
501
734
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
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));
507
740
goto globalfail;
508
741
}
509
742
510
743
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
515
goto globalfail;
516
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
521
goto globalfail;
522
}
523
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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);
525
929
526
930
return 0;
527
931
528
932
globalfail:
529
933
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
934
gnutls_certificate_free_credentials(mc->cred);
935
gnutls_dh_params_deinit(mc->dh_params);
533
936
return -1;
534
937
}
535
938
536
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){
537
942
int ret;
538
943
/* GnuTLS session creation */
539
944
do {
543
948
}
544
949
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
950
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
951
fprintf_plus(stderr,
952
"Error in GnuTLS session initialization: %s\n",
953
safer_gnutls_strerror(ret));
548
954
}
549
955
550
956
{
551
957
const char *err;
552
958
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
959
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
960
if(quit_now){
555
961
gnutls_deinit(*session);
556
962
return -1;
557
963
}
558
964
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
965
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
966
fprintf_plus(stderr, "Syntax error at: %s\n", err);
967
fprintf_plus(stderr, "GnuTLS error: %s\n",
968
safer_gnutls_strerror(ret));
563
969
gnutls_deinit(*session);
564
970
return -1;
565
971
}
567
973
568
974
do {
569
975
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
976
mc->cred);
571
977
if(quit_now){
572
978
gnutls_deinit(*session);
573
979
return -1;
574
980
}
575
981
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
982
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
983
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
984
safer_gnutls_strerror(ret));
579
985
gnutls_deinit(*session);
580
986
return -1;
581
987
}
583
989
/* ignore client certificate if any. */
584
990
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
991
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
587
588
992
return 0;
589
993
}
590
994
592
996
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
593
997
__attribute__((unused)) const char *txt){}
594
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
595
1165
/* Called when a Mandos server is found */
596
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,
597
1168
AvahiIfIndex if_index,
598
int af){
1169
int af, mandos_context *mc){
599
1170
int ret, tcp_sd = -1;
600
1171
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
1172
struct sockaddr_storage to;
605
1173
char *buffer = NULL;
606
1174
char *decrypted_buffer = NULL;
607
1175
size_t buffer_length = 0;
610
1178
int retval = -1;
611
1179
gnutls_session_t session;
612
1180
int pf; /* Protocol family */
1181
bool route_added = false;
613
1182
614
1183
errno = 0;
615
1184
626
1195
pf = PF_INET;
627
1196
break;
628
1197
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
1198
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
1199
errno = EINVAL;
631
1200
return -1;
632
1201
}
633
1202
634
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);
635
1237
if(ret != 0){
636
1238
return -1;
637
1239
}
638
1240
639
1241
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
1242
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1243
PRIuMAX "\n", ip, (uintmax_t)port);
642
1244
}
643
1245
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
645
1247
if(tcp_sd < 0){
646
1248
int e = errno;
647
1249
perror_plus("socket");
654
1256
goto mandos_end;
655
1257
}
656
1258
657
memset(&to, 0, sizeof(to));
658
1259
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
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);
661
1263
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
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);
664
1267
}
665
1268
if(ret < 0 ){
666
1269
int e = errno;
670
1273
}
671
1274
if(ret == 0){
672
1275
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
1276
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
1277
errno = e;
675
1278
goto mandos_end;
676
1279
}
677
1280
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
1281
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1282
if(IN6_IS_ADDR_LINKLOCAL
1283
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
685
1284
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
1285
fprintf_plus(stderr, "An IPv6 link-local address is"
1286
" incomplete without a network interface\n");
688
1287
errno = EINVAL;
689
1288
goto mandos_end;
690
1289
}
691
1290
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
1291
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
1292
}
694
1293
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
1294
((struct sockaddr_in *)&to)->sin_port = htons(port);
698
1295
}
699
1296
700
1297
if(quit_now){
708
1305
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
1306
perror_plus("if_indextoname");
710
1307
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1308
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1309
"\n", ip, interface, (uintmax_t)port);
713
1310
}
714
1311
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
1312
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1313
ip, (uintmax_t)port);
717
1314
}
718
1315
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
1316
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
734
}
735
}
736
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
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;
759
1397
}
760
1398
761
1399
const char *out = mandos_protocol_version;
763
1401
while(true){
764
1402
size_t out_size = strlen(out);
765
1403
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
1404
out_size - written));
767
1405
if(ret == -1){
768
1406
int e = errno;
769
1407
perror_plus("write");
789
1427
}
790
1428
791
1429
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1430
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
1431
}
794
1432
795
1433
if(quit_now){
797
1435
goto mandos_end;
798
1436
}
799
1437
800
/* Spurious warning from -Wint-to-pointer-cast */
801
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);
802
1443
803
1444
if(quit_now){
804
1445
errno = EINTR;
815
1456
816
1457
if(ret != GNUTLS_E_SUCCESS){
817
1458
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1459
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
1460
gnutls_perror(ret);
820
1461
}
821
1462
errno = EPROTO;
825
1466
/* Read OpenPGP packet that contains the wanted password */
826
1467
827
1468
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
1469
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1470
" %s\n", ip);
830
1471
}
831
1472
832
1473
while(true){
837
1478
}
838
1479
839
1480
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
1481
buffer_capacity);
841
1482
if(buffer_capacity == 0){
842
1483
int e = errno;
843
1484
perror_plus("incbuffer");
870
1511
}
871
1512
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
1513
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1514
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1515
"***\n");
874
1516
gnutls_perror(ret);
875
1517
errno = EPROTO;
876
1518
goto mandos_end;
877
1519
}
878
1520
break;
879
1521
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
1522
fprintf_plus(stderr, "Unknown error while reading data from"
1523
" encrypted session with Mandos server\n");
882
1524
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
1525
errno = EIO;
884
1526
goto mandos_end;
889
1531
}
890
1532
891
1533
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
1534
fprintf_plus(stderr, "Closing TLS session\n");
893
1535
}
894
1536
895
1537
if(quit_now){
907
1549
908
1550
if(buffer_length > 0){
909
1551
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
1552
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1553
&decrypted_buffer, mc);
913
1554
if(decrypted_buffer_size >= 0){
914
1555
1556
clearerr(stdout);
915
1557
written = 0;
916
1558
while(written < (size_t) decrypted_buffer_size){
917
1559
if(quit_now){
925
1567
if(ret == 0 and ferror(stdout)){
926
1568
int e = errno;
927
1569
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1570
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1571
strerror(errno));
930
1572
}
931
1573
errno = e;
932
1574
goto mandos_end;
933
1575
}
934
1576
written += (size_t)ret;
935
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
}
936
1588
retval = 0;
937
1589
}
938
1590
}
941
1593
942
1594
mandos_end:
943
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
}
944
1602
int e = errno;
945
1603
free(decrypted_buffer);
946
1604
free(buffer);
947
1605
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1606
ret = close(tcp_sd);
949
1607
}
950
1608
if(ret == -1){
951
1609
if(e == 0){
976
1634
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1635
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1636
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1637
void *mc){
1638
if(r == NULL){
1639
return;
1640
}
981
1641
982
1642
/* Called whenever a service has been resolved successfully or
983
1643
timed out */
984
1644
985
1645
if(quit_now){
1646
avahi_s_service_resolver_free(r);
986
1647
return;
987
1648
}
988
1649
989
1650
switch(event){
990
1651
default:
991
1652
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
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)));
995
1658
break;
996
1659
997
1660
case AVAHI_RESOLVER_FOUND:
999
1662
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1663
avahi_address_snprint(ip, sizeof(ip), address);
1001
1664
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
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);
1005
1668
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
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);
1008
1673
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1674
avahi_simple_poll_quit(simple_poll);
1010
1675
} else {
1011
ret = add_server(ip, port, interface,
1012
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
}
1013
1682
}
1014
1683
}
1015
1684
}
1025
1694
const char *domain,
1026
1695
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1696
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1697
void *mc){
1698
if(b == NULL){
1699
return;
1700
}
1030
1701
1031
1702
/* Called whenever a new services becomes available on the LAN or
1032
1703
is removed from the LAN */
1039
1710
default:
1040
1711
case AVAHI_BROWSER_FAILURE:
1041
1712
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
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);
1045
1717
return;
1046
1718
1047
1719
case AVAHI_BROWSER_NEW:
1050
1722
the callback function is called the Avahi server will free the
1051
1723
resolver for us. */
1052
1724
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
1058
1733
break;
1059
1734
1060
1735
case AVAHI_BROWSER_REMOVE:
1063
1738
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1739
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1740
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1741
fprintf_plus(stderr, "No Mandos server found, still"
1742
" searching...\n");
1067
1743
}
1068
1744
break;
1069
1745
}
1078
1754
signal_received = sig;
1079
1755
int old_errno = errno;
1080
1756
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1757
if(simple_poll != NULL){
1758
avahi_simple_poll_quit(simple_poll);
1083
1759
}
1084
1760
errno = old_errno;
1085
1761
}
1086
1762
1763
__attribute__((nonnull, warn_unused_result))
1764
bool get_flags(const char *ifname, struct ifreq *ifr){
1765
int ret;
1766
int old_errno;
1767
1768
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1769
if(s < 0){
1770
old_errno = errno;
1771
perror_plus("socket");
1772
errno = old_errno;
1773
return false;
1774
}
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1777
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1778
if(ret == -1){
1779
if(debug){
1780
old_errno = errno;
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;
1788
}
1789
return false;
1790
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1796
return true;
1797
}
1798
1799
__attribute__((nonnull, warn_unused_result))
1800
bool good_flags(const char *ifname, const struct ifreq *ifr){
1801
1802
/* Reject the loopback device */
1803
if(ifr->ifr_flags & IFF_LOOPBACK){
1804
if(debug){
1805
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1806
ifname);
1807
}
1808
return false;
1809
}
1810
/* Accept point-to-point devices only if connect_to is specified */
1811
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1812
if(debug){
1813
fprintf_plus(stderr, "Accepting point-to-point interface"
1814
" \"%s\"\n", ifname);
1815
}
1816
return true;
1817
}
1818
/* Otherwise, reject non-broadcast-capable devices */
1819
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1820
if(debug){
1821
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1822
" \"%s\"\n", ifname);
1823
}
1824
return false;
1825
}
1826
/* Reject non-ARP interfaces (including dummy interfaces) */
1827
if(ifr->ifr_flags & IFF_NOARP){
1828
if(debug){
1829
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1830
ifname);
1831
}
1832
return false;
1833
}
1834
1835
/* Accept this device */
1836
if(debug){
1837
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1838
}
1839
return true;
1840
}
1841
1087
1842
/*
1088
1843
* This function determines if a directory entry in /sys/class/net
1089
1844
* corresponds to an acceptable network device.
1090
1845
* (This function is passed to scandir(3) as a filter function.)
1091
1846
*/
1847
__attribute__((nonnull, warn_unused_result))
1092
1848
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1849
if(if_entry->d_name[0] == '.'){
1096
1850
return 0;
1097
1851
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1852
1853
struct ifreq ifr;
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
}
1859
return 0;
1860
}
1861
1862
if(not good_flags(if_entry->d_name, &ifr)){
1863
return 0;
1188
1864
}
1189
1865
return 1;
1190
1866
}
1191
1867
1868
/*
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))
1192
1903
int notdotentries(const struct dirent *direntry){
1193
1904
/* Skip "." and ".." */
1194
1905
if(direntry->d_name[0] == '.'
1200
1911
return 1;
1201
1912
}
1202
1913
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1914
/* Is this directory entry a runnable program? */
1915
__attribute__((nonnull, warn_unused_result))
1916
int runnable_hook(const struct dirent *direntry){
1917
int ret;
1918
size_t sret;
1919
struct stat st;
1920
1921
if((direntry->d_name)[0] == '\0'){
1922
/* Empty name? */
1923
return 0;
1924
}
1925
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);
1940
if(ret == -1){
1941
if(debug){
1942
perror_plus("Could not stat hook");
1943
}
1944
return 0;
1945
}
1946
if(not (S_ISREG(st.st_mode))){
1947
/* Not a regular file */
1948
if(debug){
1949
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1950
direntry->d_name);
1951
}
1952
return 0;
1953
}
1954
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1955
/* Not executable */
1956
if(debug){
1957
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1958
direntry->d_name);
1959
}
1960
return 0;
1961
}
1962
if(debug){
1963
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1964
direntry->d_name);
1965
}
1966
return 1;
1967
}
1968
1969
__attribute__((nonnull, warn_unused_result))
1970
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
mandos_context *mc){
1204
1972
int ret;
1205
1973
struct timespec now;
1206
1974
struct timespec waited_time;
1207
1975
intmax_t block_time;
1208
1976
1209
1977
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"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");
1214
1982
}
1215
1983
ret = avahi_simple_poll_iterate(s, -1);
1216
1984
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1985
if(debug){
1986
fprintf_plus(stderr, "Check current_server if we should run"
1987
" it, or wait\n");
1220
1988
}
1221
1989
/* the current time */
1222
1990
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1995
/* Calculating in ms how long time between now and server
1228
1996
who we visted longest time ago. Now - last seen. */
1229
1997
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1998
- mc->current_server->last_seen.tv_sec);
1231
1999
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
2000
- mc->current_server->last_seen.tv_nsec);
1233
2001
/* total time is 10s/10,000ms.
1234
2002
Converting to s from ms by dividing by 1,000,
1235
2003
and ns to ms by dividing by 1,000,000. */
1236
2004
block_time = ((retry_interval
1237
2005
- ((intmax_t)waited_time.tv_sec * 1000))
1238
2006
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
2007
2008
if(debug){
2009
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2010
block_time);
1242
2011
}
1243
2012
1244
2013
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
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);
1249
2018
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
2019
avahi_simple_poll_quit(s);
1251
2020
return 0;
1252
2021
}
1253
2022
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
2023
&mc->current_server->last_seen);
1255
2024
if(ret == -1){
1256
2025
perror_plus("clock_gettime");
1257
2026
return -1;
1258
2027
}
1259
mc.current_server = mc.current_server->next;
2028
mc->current_server = mc->current_server->next;
1260
2029
block_time = 0; /* Call avahi to find new Mandos
1261
2030
servers, but don't block */
1262
2031
}
1264
2033
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
2034
}
1266
2035
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
2036
if(ret > 0 or errno != EINTR){
1268
2037
return (ret != 1) ? ret : 0;
1269
2038
}
1270
2039
}
1271
2040
}
1272
2041
}
1273
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
1274
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 };
1275
2434
AvahiSServiceBrowser *sb = NULL;
1276
int error;
2435
error_t ret_errno;
1277
2436
int ret;
1278
2437
intmax_t tmpmax;
1279
2438
char *tmp;
1280
2439
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
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;
1289
2445
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
2446
const char *seckey = PATHDIR "/" SECKEY;
1291
2447
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
char *interfaces_hooks = NULL;
1292
2450
1293
2451
bool gnutls_initialized = false;
1294
2452
bool gpgme_initialized = false;
1346
2504
.doc = "Bit length of the prime number used in the"
1347
2505
" Diffie-Hellman key exchange",
1348
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 },
1349
2512
{ .name = "priority", .key = 130,
1350
2513
.arg = "STRING",
1351
2514
.doc = "GnuTLS priority string for the TLS handshake",
1356
2519
.group = 2 },
1357
2520
{ .name = "retry", .key = 132,
1358
2521
.arg = "SECONDS",
1359
.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",
1360
2527
.group = 2 },
1361
2528
/*
1362
2529
* These reproduce what we would get without ARGP_NO_HELP
1381
2548
connect_to = arg;
1382
2549
break;
1383
2550
case 'i': /* --interface */
1384
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
}
1385
2556
break;
1386
2557
case 's': /* --seckey */
1387
2558
seckey = arg;
1398
2569
}
1399
2570
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1400
2571
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
1401
2575
case 130: /* --priority */
1402
2576
mc.priority = arg;
1403
2577
break;
1411
2585
errno = 0;
1412
2586
retry_interval = strtod(arg, &tmp);
1413
2587
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
2588
or (retry_interval * 1000) > INT_MAX
2589
or retry_interval < 0){
1415
2590
argp_error(state, "Bad retry interval");
1416
2591
}
1417
2592
break;
2593
case 133: /* --network-hook-dir */
2594
hookdir = arg;
2595
break;
1418
2596
/*
1419
2597
* These reproduce what we would get without ARGP_NO_HELP
1420
2598
*/
1426
2604
argp_state_help(state, state->out_stream,
1427
2605
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
2606
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2607
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
2608
exit(argp_err_exit_status);
1431
2609
break;
1432
2610
default:
1439
2617
.args_doc = "",
1440
2618
.doc = "Mandos client -- Get and decrypt"
1441
2619
" passwords from a Mandos server" };
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
1445
2623
case 0:
1446
2624
break;
1447
2625
case ENOMEM:
1448
2626
default:
1449
errno = ret;
2627
errno = ret_errno;
1450
2628
perror_plus("argp_parse");
1451
2629
exitcode = EX_OSERR;
1452
2630
goto end;
1455
2633
goto end;
1456
2634
}
1457
2635
}
1458
2636
1459
2637
{
1460
2638
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
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");
2745
goto end;
2746
}
2747
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2749
}
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
1513
2752
}
1514
2753
1515
2754
if(not debug){
1516
2755
avahi_set_log_function(empty_log);
1517
2756
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
1543
2757
1544
2758
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
2759
from the signal handler */
1546
2760
/* Initialize the pseudo-RNG for Avahi */
1547
2761
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
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");
1551
2766
exitcode = EX_UNAVAILABLE;
1552
2767
goto end;
1553
2768
}
1615
2830
}
1616
2831
}
1617
2832
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
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;
1703
2884
}
1704
2885
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
2886
break;
1723
2887
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
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);
1761
2916
}
1762
2917
1763
2918
if(quit_now){
1764
2919
goto end;
1765
2920
}
1766
2921
1767
ret = init_gnutls_global(pubkey, seckey);
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1768
2923
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2924
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2925
exitcode = EX_UNAVAILABLE;
1771
2926
goto end;
1772
2927
} else {
1777
2932
goto end;
1778
2933
}
1779
2934
1780
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){
1781
2945
perror_plus("mkdtemp");
1782
2946
goto end;
1783
2947
}
1784
tempdir_created = true;
1785
2948
1786
2949
if(quit_now){
1787
2950
goto end;
1788
2951
}
1789
2952
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2953
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2954
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2955
exitcode = EX_UNAVAILABLE;
1793
2956
goto end;
1794
2957
} else {
1803
2966
/* Connect directly, do not use Zeroconf */
1804
2967
/* (Mainly meant for debugging) */
1805
2968
char *address = strrchr(connect_to, ':');
2969
1806
2970
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2971
fprintf_plus(stderr, "No colon in address\n");
1808
2972
exitcode = EX_USAGE;
1809
2973
goto end;
1810
2974
}
1813
2977
goto end;
1814
2978
}
1815
2979
1816
uint16_t port;
2980
in_port_t port;
1817
2981
errno = 0;
1818
2982
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2983
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2984
or tmpmax != (in_port_t)tmpmax){
2985
fprintf_plus(stderr, "Bad port number\n");
1822
2986
exitcode = EX_USAGE;
1823
2987
goto end;
1824
2988
}
1825
2989
1826
2990
if(quit_now){
1827
2991
goto end;
1828
2992
}
1829
2993
1830
port = (uint16_t)tmpmax;
2994
port = (in_port_t)tmpmax;
1831
2995
*address = '\0';
1832
address = connect_to;
1833
2996
/* Colon in address indicates IPv6 */
1834
2997
int af;
1835
if(strchr(address, ':') != NULL){
2998
if(strchr(connect_to, ':') != NULL){
1836
2999
af = AF_INET6;
3000
/* Accept [] around IPv6 address - see RFC 5952 */
3001
if(connect_to[0] == '[' and address[-1] == ']')
3002
{
3003
connect_to++;
3004
address[-1] = '\0';
3005
}
1837
3006
} else {
1838
3007
af = AF_INET;
1839
3008
}
3009
address = connect_to;
1840
3010
1841
3011
if(quit_now){
1842
3012
goto end;
1843
3013
}
1844
3014
1845
3015
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
3016
ret = start_mandos_communication(address, port, if_index, af,
3017
&mc);
1847
3018
if(quit_now or ret == 0){
1848
3019
break;
1849
3020
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
3021
if(debug){
3022
fprintf_plus(stderr, "Retrying in %d seconds\n",
3023
(int)retry_interval);
3024
}
3025
sleep((unsigned int)retry_interval);
3026
}
3027
3028
if(not quit_now){
1854
3029
exitcode = EXIT_SUCCESS;
1855
3030
}
1856
3031
1857
3032
goto end;
1858
3033
}
1859
3034
1871
3046
config.publish_domain = 0;
1872
3047
1873
3048
/* Allocate a new server */
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
3049
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
1877
3051
1878
3052
/* Free the Avahi configuration data */
1879
3053
avahi_server_config_free(&config);
1881
3055
1882
3056
/* Check if creating the Avahi server object succeeded */
1883
3057
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
3058
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
1886
3060
exitcode = EX_UNAVAILABLE;
1887
3061
goto end;
1888
3062
}
1894
3068
/* Create the Avahi service browser */
1895
3069
sb = avahi_s_service_browser_new(mc.server, if_index,
1896
3070
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
3071
NULL, 0, browse_callback,
3072
(void *)&mc);
1898
3073
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
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)));
1901
3076
exitcode = EX_UNAVAILABLE;
1902
3077
goto end;
1903
3078
}
1909
3084
/* Run the main loop */
1910
3085
1911
3086
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
3087
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
3088
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
3089
3090
ret = avahi_loop_with_timeout(simple_poll,
3091
(int)(retry_interval * 1000), &mc);
1917
3092
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
3093
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3094
(ret == 0) ? "successfully" : "with error");
1920
3095
}
1921
3096
1922
3097
end:
1923
3098
1924
3099
if(debug){
1925
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
}
1926
3107
}
1927
3108
1928
3109
/* Cleanup things */
3110
free(mc.interfaces);
3111
1929
3112
if(sb != NULL)
1930
3113
avahi_s_service_browser_free(sb);
1931
3114
1932
3115
if(mc.server != NULL)
1933
3116
avahi_server_free(mc.server);
1934
3117
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
3118
if(simple_poll != NULL)
3119
avahi_simple_poll_free(simple_poll);
1937
3120
1938
3121
if(gnutls_initialized){
1939
3122
gnutls_certificate_free_credentials(mc.cred);
1940
gnutls_global_deinit();
1941
3123
gnutls_dh_params_deinit(mc.dh_params);
1942
3124
}
1943
3125
1944
3126
if(gpgme_initialized){
1945
3127
gpgme_release(mc.ctx);
1946
3128
}
1947
3129
1948
3130
/* Cleans up the circular linked list of Mandos servers the client
1949
3131
has seen */
1950
3132
if(mc.current_server != NULL){
1951
3133
mc.current_server->prev->next = NULL;
1952
3134
while(mc.current_server != NULL){
1953
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
1954
3144
free(mc.current_server);
1955
3145
mc.current_server = next;
1956
3146
}
1957
3147
}
1958
3148
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
}
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);
1989
3242
}
1990
3243
1991
3244
/* Removes the GPGME temp directory and all files inside */
1992
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
direntry->d_name);
2002
if(ret < 0){
2003
perror_plus("asprintf");
2004
continue;
2005
}
2006
ret = remove(fullname);
2007
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2010
}
2011
free(fullname);
2012
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
2020
}
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2024
}
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
2025
3247
}
2026
3248
2027
3249
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0