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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- 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 © 2008-2022 Teddy Hogeborn
13
* Copyright © 2008-2022 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
29
* Contact the authors at <mandos@recompile.se>.
31
30
*/
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
47
struct argp_option,
48
struct argp_state, argp_error(),
49
argp_state_help,
50
ARGP_HELP_STD_HELP,
51
ARGP_HELP_EXIT_ERR,
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
53
argp_err_exit_status,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
56
ARGP_NO_HELP */
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
82
EIO, ENOENT, ENXIO, error_t,
83
ENOMEM, EISDIR, ENOTEMPTY */
84
#include <stdio.h> /* fprintf(), stderr, perror(), FILE,
85
vfprintf(), off_t, SEEK_SET,
86
stdout, fwrite(), ferror(),
87
fflush(), asprintf() */
88
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
89
#include <stdlib.h> /* realloc(), free(), malloc(),
90
getenv(), EXIT_FAILURE, setenv(),
91
EXIT_SUCCESS, strtof(), strtod(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
memcpy(), strrchr(), strchr(),
96
strsignal() */
97
#include <fcntl.h> /* open(), O_RDONLY, O_DIRECTORY,
98
O_PATH, O_CLOEXEC, openat(),
99
O_NOFOLLOW, AT_REMOVEDIR */
100
#include <iso646.h> /* or, and, not */
101
#include <sys/stat.h> /* struct stat, fstat(), fstatat(),
102
S_ISREG(), S_IXUSR, S_IXGRP,
103
S_IXOTH, lstat() */
104
#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),
105
if_nametoindex(), SIOCGIFFLAGS,
106
IFF_LOOPBACK, IFF_POINTOPOINT,
107
IFF_BROADCAST, IFF_NOARP, IFF_UP,
108
IFF_RUNNING, SIOCSIFFLAGS */
109
#include <sysexits.h> /* EX_NOPERM, EX_OSERR,
110
EX_UNAVAILABLE, EX_USAGE */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
111
89
#include <grp.h> /* setgroups() */
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
113
WEXITSTATUS(), WIFSIGNALED(),
114
WTERMSIG() */
115
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
116
SIG_DFL, sigemptyset(),
117
sigaddset(), SIGINT, SIGHUP,
118
SIG_IGN, raise() */
119
#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,
120
PF_INET6, AF_INET, PF_INET,
121
socket(), SOCK_STREAM,
122
SOCK_CLOEXEC, struct sockaddr,
123
connect(), SOCK_DGRAM */
124
#include <argz.h> /* argz_next(), argz_add_sep(),
125
argz_delete(), argz_stringify(),
126
argz_add(), argz_count() */
127
#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,
128
PRIdMAX, PRIu16, intmax_t,
129
strtoimax() */
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
132
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
EAI_SYSTEM, gai_strerror() */
134
#include <sys/ioctl.h> /* ioctl() */
135
#include <dirent.h> /* struct dirent, scandirat(),
136
alphasort(), scandir() */
137
#include <limits.h> /* INT_MAX */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
138
94
139
95
#ifdef __linux__
140
96
#include <sys/klog.h> /* klogctl() */
153
109
154
110
/* GnuTLS */
155
111
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
112
functions:
113
gnutls_*
114
init_gnutls_session(),
115
GNUTLS_* */
158
116
#include <gnutls/openpgp.h>
159
117
/* gnutls_certificate_set_openpgp_key_file(),
160
118
GNUTLS_OPENPGP_FMT_BASE64 */
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
162
#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
163
GNUTLS_PKCS_NULL_PASSWORD */
164
#endif
165
119
166
120
/* GPGME */
167
121
#include <gpgme.h> /* All GPGME types, constants and
168
122
functions:
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
123
gpgme_*
124
GPGME_PROTOCOL_OpenPGP,
125
GPG_ERR_NO_* */
172
126
173
127
#define BUFFER_SIZE 256
174
128
175
129
#define PATHDIR "/conf/conf.d/mandos"
176
130
#define SECKEY "seckey.txt"
177
131
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
181
133
182
134
bool debug = false;
186
138
static const char sys_class_net[] = "/sys/class/net";
187
139
char *connect_to = NULL;
188
140
const char *hookdir = HOOKDIR;
189
int hookdir_fd = -1;
190
141
uid_t uid = 65534;
191
142
gid_t gid = 65534;
192
143
229
180
perror(print_text);
230
181
}
231
182
232
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
233
184
int fprintf_plus(FILE *stream, const char *format, ...){
234
185
va_list ap;
235
186
va_start (ap, format);
236
187
237
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
238
189
program_invocation_short_name));
239
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
240
191
}
241
192
242
193
/*
244
195
* bytes. "buffer_capacity" is how much is currently allocated,
245
196
* "buffer_length" is how much is already used.
246
197
*/
247
__attribute__((nonnull, warn_unused_result))
248
198
size_t incbuffer(char **buffer, size_t buffer_length,
249
199
size_t buffer_capacity){
250
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
251
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
252
if(new_buf == NULL){
253
int old_errno = errno;
254
free(*buffer);
255
errno = old_errno;
256
*buffer = NULL;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(buffer == NULL){
257
203
return 0;
258
204
}
259
*buffer = new_buf;
260
205
buffer_capacity += BUFFER_SIZE;
261
206
}
262
207
return buffer_capacity;
263
208
}
264
209
265
210
/* Add server to set of servers to retry periodically */
266
__attribute__((nonnull, warn_unused_result))
267
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
268
212
int af, server **current_server){
269
213
int ret;
278
222
.af = af };
279
223
if(new_server->ip == NULL){
280
224
perror_plus("strdup");
281
free(new_server);
282
return false;
283
}
284
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
285
if(ret == -1){
286
perror_plus("clock_gettime");
287
#ifdef __GNUC__
288
#pragma GCC diagnostic push
289
#pragma GCC diagnostic ignored "-Wcast-qual"
290
#endif
291
free((char *)(new_server->ip));
292
#ifdef __GNUC__
293
#pragma GCC diagnostic pop
294
#endif
295
free(new_server);
296
225
return false;
297
226
}
298
227
/* Special case of first server */
300
229
new_server->next = new_server;
301
230
new_server->prev = new_server;
302
231
*current_server = new_server;
232
/* Place the new server last in the list */
303
233
} else {
304
/* Place the new server last in the list */
305
234
new_server->next = *current_server;
306
235
new_server->prev = (*current_server)->prev;
307
236
new_server->prev->next = new_server;
308
237
(*current_server)->prev = new_server;
309
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
310
244
return true;
311
245
}
312
246
313
/* Set effective uid to 0, return errno */
314
__attribute__((warn_unused_result))
315
int raise_privileges(void){
316
int old_errno = errno;
317
int ret = 0;
318
if(seteuid(0) == -1){
319
ret = errno;
320
}
321
errno = old_errno;
322
return ret;
323
}
324
325
/* Set effective and real user ID to 0. Return errno. */
326
__attribute__((warn_unused_result))
327
int raise_privileges_permanently(void){
328
int old_errno = errno;
329
int ret = raise_privileges();
330
if(ret != 0){
331
errno = old_errno;
332
return ret;
333
}
334
if(setuid(0) == -1){
335
ret = errno;
336
}
337
errno = old_errno;
338
return ret;
339
}
340
341
/* Set effective user ID to unprivileged saved user ID */
342
__attribute__((warn_unused_result))
343
int lower_privileges(void){
344
int old_errno = errno;
345
int ret = 0;
346
if(seteuid(uid) == -1){
347
ret = errno;
348
}
349
errno = old_errno;
350
return ret;
351
}
352
353
/* Lower privileges permanently */
354
__attribute__((warn_unused_result))
355
int lower_privileges_permanently(void){
356
int old_errno = errno;
357
int ret = 0;
358
if(setuid(uid) == -1){
359
ret = errno;
360
}
361
errno = old_errno;
362
return ret;
363
}
364
365
247
/*
366
248
* Initialize GPGME.
367
249
*/
368
__attribute__((nonnull, warn_unused_result))
369
static bool init_gpgme(const char * const seckey,
370
const char * const pubkey,
371
const char * const tempdir,
372
mandos_context *mc){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
373
252
gpgme_error_t rc;
374
253
gpgme_engine_info_t engine_info;
375
254
376
255
/*
377
256
* Helper function to insert pub and seckey to the engine keyring.
378
257
*/
379
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
380
259
int ret;
381
260
int fd;
382
261
gpgme_data_t pgp_data;
387
266
return false;
388
267
}
389
268
390
/* Workaround for systems without a real-time clock; see also
391
Debian bug #894495: <https://bugs.debian.org/894495> */
392
do {
393
{
394
time_t currtime = time(NULL);
395
if(currtime != (time_t)-1){
396
struct tm tm;
397
if(gmtime_r(&currtime, &tm) == NULL) {
398
perror_plus("gmtime_r");
399
break;
400
}
401
if(tm.tm_year != 70 or tm.tm_mon != 0){
402
break;
403
}
404
if(debug){
405
fprintf_plus(stderr, "System clock is January 1970");
406
}
407
} else {
408
if(debug){
409
fprintf_plus(stderr, "System clock is invalid");
410
}
411
}
412
}
413
struct stat keystat;
414
ret = fstat(fd, &keystat);
415
if(ret != 0){
416
perror_plus("fstat");
417
break;
418
}
419
ret = raise_privileges();
420
if(ret != 0){
421
errno = ret;
422
perror_plus("Failed to raise privileges");
423
break;
424
}
425
if(debug){
426
fprintf_plus(stderr,
427
"Setting system clock to key file mtime");
428
}
429
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
430
perror_plus("clock_settime");
431
}
432
ret = lower_privileges();
433
if(ret != 0){
434
errno = ret;
435
perror_plus("Failed to lower privileges");
436
}
437
} while(false);
438
439
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
270
if(rc != GPG_ERR_NO_ERROR){
441
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
449
279
gpgme_strsource(rc), gpgme_strerror(rc));
450
280
return false;
451
281
}
452
{
453
gpgme_import_result_t import_result
454
= gpgme_op_import_result(mc->ctx);
455
if((import_result->imported < 1
456
or import_result->not_imported > 0)
457
and import_result->unchanged == 0){
458
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
459
fprintf_plus(stderr,
460
"The total number of considered keys: %d\n",
461
import_result->considered);
462
fprintf_plus(stderr,
463
"The number of keys without user ID: %d\n",
464
import_result->no_user_id);
465
fprintf_plus(stderr,
466
"The total number of imported keys: %d\n",
467
import_result->imported);
468
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
469
import_result->imported_rsa);
470
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
471
import_result->unchanged);
472
fprintf_plus(stderr, "The number of new user IDs: %d\n",
473
import_result->new_user_ids);
474
fprintf_plus(stderr, "The number of new sub keys: %d\n",
475
import_result->new_sub_keys);
476
fprintf_plus(stderr, "The number of new signatures: %d\n",
477
import_result->new_signatures);
478
fprintf_plus(stderr, "The number of new revocations: %d\n",
479
import_result->new_revocations);
480
fprintf_plus(stderr,
481
"The total number of secret keys read: %d\n",
482
import_result->secret_read);
483
fprintf_plus(stderr,
484
"The number of imported secret keys: %d\n",
485
import_result->secret_imported);
486
fprintf_plus(stderr,
487
"The number of unchanged secret keys: %d\n",
488
import_result->secret_unchanged);
489
fprintf_plus(stderr, "The number of keys not imported: %d\n",
490
import_result->not_imported);
491
for(gpgme_import_status_t import_status
492
= import_result->imports;
493
import_status != NULL;
494
import_status = import_status->next){
495
fprintf_plus(stderr, "Import status for key: %s\n",
496
import_status->fpr);
497
if(import_status->result != GPG_ERR_NO_ERROR){
498
fprintf_plus(stderr, "Import result: %s: %s\n",
499
gpgme_strsource(import_status->result),
500
gpgme_strerror(import_status->result));
501
}
502
fprintf_plus(stderr, "Key status:\n");
503
fprintf_plus(stderr,
504
import_status->status & GPGME_IMPORT_NEW
505
? "The key was new.\n"
506
: "The key was not new.\n");
507
fprintf_plus(stderr,
508
import_status->status & GPGME_IMPORT_UID
509
? "The key contained new user IDs.\n"
510
: "The key did not contain new user IDs.\n");
511
fprintf_plus(stderr,
512
import_status->status & GPGME_IMPORT_SIG
513
? "The key contained new signatures.\n"
514
: "The key did not contain new signatures.\n");
515
fprintf_plus(stderr,
516
import_status->status & GPGME_IMPORT_SUBKEY
517
? "The key contained new sub keys.\n"
518
: "The key did not contain new sub keys.\n");
519
fprintf_plus(stderr,
520
import_status->status & GPGME_IMPORT_SECRET
521
? "The key contained a secret key.\n"
522
: "The key did not contain a secret key.\n");
523
}
524
return false;
525
}
526
}
527
282
528
ret = close(fd);
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
529
284
if(ret == -1){
530
285
perror_plus("close");
531
286
}
570
325
/* Create new GPGME "context" */
571
326
rc = gpgme_new(&(mc->ctx));
572
327
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
575
331
return false;
576
332
}
577
333
586
342
* Decrypt OpenPGP data.
587
343
* Returns -1 on error
588
344
*/
589
__attribute__((nonnull, warn_unused_result))
590
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
591
346
size_t crypto_size,
592
347
char **plaintext,
613
368
/* Create new empty GPGME data buffer for the plaintext */
614
369
rc = gpgme_data_new(&dh_plain);
615
370
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
617
373
gpgme_strsource(rc), gpgme_strerror(rc));
618
374
gpgme_data_release(dh_crypto);
619
375
return -1;
632
388
if(result == NULL){
633
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
390
} else {
635
if(result->unsupported_algorithm != NULL) {
636
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
637
result->unsupported_algorithm);
638
}
639
fprintf_plus(stderr, "Wrong key usage: %s\n",
640
result->wrong_key_usage ? "Yes" : "No");
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
641
395
if(result->file_name != NULL){
642
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
397
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
398
gpgme_recipient_t recipient;
399
recipient = result->recipients;
400
while(recipient != NULL){
647
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
405
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
408
recipient = recipient->next;
652
409
}
653
410
}
654
411
}
710
467
return plaintext_length;
711
468
}
712
469
713
__attribute__((warn_unused_result, const))
714
static const char *safe_string(const char *str){
715
if(str == NULL)
716
return "(unknown)";
717
return str;
718
}
719
720
__attribute__((warn_unused_result))
721
static const char *safer_gnutls_strerror(int value){
470
static const char * safer_gnutls_strerror(int value){
722
471
const char *ret = gnutls_strerror(value);
723
return safe_string(ret);
472
if(ret == NULL)
473
ret = "(unknown)";
474
return ret;
724
475
}
725
476
726
477
/* GnuTLS log function callback */
727
__attribute__((nonnull))
728
478
static void debuggnutls(__attribute__((unused)) int level,
729
479
const char* string){
730
480
fprintf_plus(stderr, "GnuTLS: %s", string);
731
481
}
732
482
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
734
483
static int init_gnutls_global(const char *pubkeyfilename,
735
484
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
485
mandos_context *mc){
738
486
int ret;
739
487
741
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
742
490
}
743
491
492
ret = gnutls_global_init();
493
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
496
return -1;
497
}
498
744
499
if(debug){
745
500
/* "Use a log level over 10 to enable all debugging options."
746
501
* - GnuTLS manual
754
509
if(ret != GNUTLS_E_SUCCESS){
755
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
511
safer_gnutls_strerror(ret));
512
gnutls_global_deinit();
757
513
return -1;
758
514
}
759
515
760
516
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
763
519
pubkeyfilename,
764
520
seckeyfilename);
765
521
}
766
522
767
#if GNUTLS_VERSION_NUMBER >= 0x030606
768
ret = gnutls_certificate_set_rawpk_key_file
769
(mc->cred, pubkeyfilename, seckeyfilename,
770
GNUTLS_X509_FMT_PEM, /* format */
771
NULL, /* pass */
772
/* key_usage */
773
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
774
NULL, /* names */
775
0, /* names_length */
776
/* privkey_flags */
777
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
778
0); /* pkcs11_flags */
779
#elif GNUTLS_VERSION_NUMBER < 0x030600
780
523
ret = gnutls_certificate_set_openpgp_key_file
781
524
(mc->cred, pubkeyfilename, seckeyfilename,
782
525
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
526
if(ret != GNUTLS_E_SUCCESS){
787
527
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
531
safer_gnutls_strerror(ret));
800
540
safer_gnutls_strerror(ret));
801
541
goto globalfail;
802
542
}
803
/* If a Diffie-Hellman parameters file was given, try to use it */
804
if(dhparamsfilename != NULL){
805
gnutls_datum_t params = { .data = NULL, .size = 0 };
806
do {
807
int dhpfile = open(dhparamsfilename, O_RDONLY);
808
if(dhpfile == -1){
809
perror_plus("open");
810
dhparamsfilename = NULL;
811
break;
812
}
813
size_t params_capacity = 0;
814
while(true){
815
params_capacity = incbuffer((char **)¶ms.data,
816
(size_t)params.size,
817
(size_t)params_capacity);
818
if(params_capacity == 0){
819
perror_plus("incbuffer");
820
free(params.data);
821
params.data = NULL;
822
dhparamsfilename = NULL;
823
break;
824
}
825
ssize_t bytes_read = read(dhpfile,
826
params.data + params.size,
827
BUFFER_SIZE);
828
/* EOF */
829
if(bytes_read == 0){
830
break;
831
}
832
/* check bytes_read for failure */
833
if(bytes_read < 0){
834
perror_plus("read");
835
free(params.data);
836
params.data = NULL;
837
dhparamsfilename = NULL;
838
break;
839
}
840
params.size += (unsigned int)bytes_read;
841
}
842
ret = close(dhpfile);
843
if(ret == -1){
844
perror_plus("close");
845
}
846
if(params.data == NULL){
847
dhparamsfilename = NULL;
848
}
849
if(dhparamsfilename == NULL){
850
break;
851
}
852
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
853
GNUTLS_X509_FMT_PEM);
854
if(ret != GNUTLS_E_SUCCESS){
855
fprintf_plus(stderr, "Failed to parse DH parameters in file"
856
" \"%s\": %s\n", dhparamsfilename,
857
safer_gnutls_strerror(ret));
858
dhparamsfilename = NULL;
859
}
860
free(params.data);
861
} while(false);
862
}
863
if(dhparamsfilename == NULL){
864
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
/* Find out the optimal number of DH bits */
867
/* Try to read the private key file */
868
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
869
do {
870
int secfile = open(seckeyfilename, O_RDONLY);
871
if(secfile == -1){
872
perror_plus("open");
873
break;
874
}
875
size_t buffer_capacity = 0;
876
while(true){
877
buffer_capacity = incbuffer((char **)&buffer.data,
878
(size_t)buffer.size,
879
(size_t)buffer_capacity);
880
if(buffer_capacity == 0){
881
perror_plus("incbuffer");
882
free(buffer.data);
883
buffer.data = NULL;
884
break;
885
}
886
ssize_t bytes_read = read(secfile,
887
buffer.data + buffer.size,
888
BUFFER_SIZE);
889
/* EOF */
890
if(bytes_read == 0){
891
break;
892
}
893
/* check bytes_read for failure */
894
if(bytes_read < 0){
895
perror_plus("read");
896
free(buffer.data);
897
buffer.data = NULL;
898
break;
899
}
900
buffer.size += (unsigned int)bytes_read;
901
}
902
close(secfile);
903
} while(false);
904
/* If successful, use buffer to parse private key */
905
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
906
if(buffer.data != NULL){
907
{
908
gnutls_openpgp_privkey_t privkey = NULL;
909
ret = gnutls_openpgp_privkey_init(&privkey);
910
if(ret != GNUTLS_E_SUCCESS){
911
fprintf_plus(stderr, "Error initializing OpenPGP key"
912
" structure: %s",
913
safer_gnutls_strerror(ret));
914
free(buffer.data);
915
buffer.data = NULL;
916
} else {
917
ret = gnutls_openpgp_privkey_import
918
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
919
if(ret != GNUTLS_E_SUCCESS){
920
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
921
safer_gnutls_strerror(ret));
922
privkey = NULL;
923
}
924
free(buffer.data);
925
buffer.data = NULL;
926
if(privkey != NULL){
927
/* Use private key to suggest an appropriate
928
sec_param */
929
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
930
gnutls_openpgp_privkey_deinit(privkey);
931
if(debug){
932
fprintf_plus(stderr, "This OpenPGP key implies using"
933
" a GnuTLS security parameter \"%s\".\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)));
936
}
937
}
938
}
939
}
940
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
941
/* Err on the side of caution */
942
sec_param = GNUTLS_SEC_PARAM_ULTRA;
943
if(debug){
944
fprintf_plus(stderr, "Falling back to security parameter"
945
" \"%s\"\n",
946
safe_string(gnutls_sec_param_get_name
947
(sec_param)));
948
}
949
}
950
}
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
952
if(uret != 0){
953
mc->dh_bits = uret;
954
if(debug){
955
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
956
" implies %u DH bits; using that.\n",
957
safe_string(gnutls_sec_param_get_name
958
(sec_param)),
959
mc->dh_bits);
960
}
961
} else {
962
fprintf_plus(stderr, "Failed to get implied number of DH"
963
" bits for security parameter \"%s\"): %s\n",
964
safe_string(gnutls_sec_param_get_name
965
(sec_param)),
966
safer_gnutls_strerror(ret));
967
goto globalfail;
968
}
969
#endif
970
} else { /* dh_bits != 0 */
971
if(debug){
972
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
973
mc->dh_bits);
974
}
975
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
976
if(ret != GNUTLS_E_SUCCESS){
977
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
978
" bits): %s\n", mc->dh_bits,
979
safer_gnutls_strerror(ret));
980
goto globalfail;
981
}
982
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
983
}
984
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
goto globalfail;
548
}
549
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
985
551
986
552
return 0;
987
553
988
554
globalfail:
989
555
990
556
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_global_deinit();
991
558
gnutls_dh_params_deinit(mc->dh_params);
992
559
return -1;
993
560
}
994
561
995
__attribute__((nonnull, warn_unused_result))
996
562
static int init_gnutls_session(gnutls_session_t *session,
997
563
mandos_context *mc){
998
564
int ret;
999
565
/* GnuTLS session creation */
1000
566
do {
1001
ret = gnutls_init(session, (GNUTLS_SERVER
1002
#if GNUTLS_VERSION_NUMBER >= 0x030506
1003
| GNUTLS_NO_TICKETS
1004
#endif
1005
#if GNUTLS_VERSION_NUMBER >= 0x030606
1006
| GNUTLS_ENABLE_RAWPK
1007
#endif
1008
));
567
ret = gnutls_init(session, GNUTLS_SERVER);
1009
568
if(quit_now){
1010
569
return -1;
1011
570
}
1052
611
/* ignore client certificate if any. */
1053
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
1054
613
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
615
1055
616
return 0;
1056
617
}
1057
618
1059
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1060
621
__attribute__((unused)) const char *txt){}
1061
622
1062
/* Helper function to add_local_route() and delete_local_route() */
1063
__attribute__((nonnull, warn_unused_result))
1064
static bool add_delete_local_route(const bool add,
1065
const char *address,
1066
AvahiIfIndex if_index){
1067
int ret;
1068
char helper[] = "mandos-client-iprouteadddel";
1069
char add_arg[] = "add";
1070
char delete_arg[] = "delete";
1071
char debug_flag[] = "--debug";
1072
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1073
if(pluginhelperdir == NULL){
1074
if(debug){
1075
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1076
" variable not set; cannot run helper\n");
1077
}
1078
return false;
1079
}
1080
1081
char interface[IF_NAMESIZE];
1082
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1083
perror_plus("if_indextoname");
1084
return false;
1085
}
1086
1087
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1088
if(devnull == -1){
1089
perror_plus("open(\"/dev/null\", O_RDONLY)");
1090
return false;
1091
}
1092
pid_t pid = fork();
1093
if(pid == 0){
1094
/* Child */
1095
/* Raise privileges */
1096
errno = raise_privileges_permanently();
1097
if(errno != 0){
1098
perror_plus("Failed to raise privileges");
1099
/* _exit(EX_NOPERM); */
1100
} else {
1101
/* Set group */
1102
errno = 0;
1103
ret = setgid(0);
1104
if(ret == -1){
1105
perror_plus("setgid");
1106
close(devnull);
1107
_exit(EX_NOPERM);
1108
}
1109
/* Reset supplementary groups */
1110
errno = 0;
1111
ret = setgroups(0, NULL);
1112
if(ret == -1){
1113
perror_plus("setgroups");
1114
close(devnull);
1115
_exit(EX_NOPERM);
1116
}
1117
}
1118
ret = dup2(devnull, STDIN_FILENO);
1119
if(ret == -1){
1120
perror_plus("dup2(devnull, STDIN_FILENO)");
1121
close(devnull);
1122
_exit(EX_OSERR);
1123
}
1124
ret = close(devnull);
1125
if(ret == -1){
1126
perror_plus("close");
1127
}
1128
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1129
if(ret == -1){
1130
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1131
_exit(EX_OSERR);
1132
}
1133
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1134
O_RDONLY
1135
| O_DIRECTORY
1136
| O_PATH
1137
| O_CLOEXEC));
1138
if(helperdir_fd == -1){
1139
perror_plus("open");
1140
_exit(EX_UNAVAILABLE);
1141
}
1142
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1143
helper, O_RDONLY));
1144
if(helper_fd == -1){
1145
perror_plus("openat");
1146
close(helperdir_fd);
1147
_exit(EX_UNAVAILABLE);
1148
}
1149
close(helperdir_fd);
1150
#ifdef __GNUC__
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wcast-qual"
1153
#endif
1154
if(fexecve(helper_fd, (char *const [])
1155
{ helper, add ? add_arg : delete_arg, (char *)address,
1156
interface, debug ? debug_flag : NULL, NULL },
1157
environ) == -1){
1158
#ifdef __GNUC__
1159
#pragma GCC diagnostic pop
1160
#endif
1161
perror_plus("fexecve");
1162
_exit(EXIT_FAILURE);
1163
}
1164
}
1165
if(pid == -1){
1166
perror_plus("fork");
1167
close(devnull);
1168
return false;
1169
}
1170
ret = close(devnull);
1171
if(ret == -1){
1172
perror_plus("close");
1173
}
1174
int status;
1175
pid_t pret = -1;
1176
errno = 0;
1177
do {
1178
pret = waitpid(pid, &status, 0);
1179
if(pret == -1 and errno == EINTR and quit_now){
1180
int errno_raising = 0;
1181
if((errno = raise_privileges()) != 0){
1182
errno_raising = errno;
1183
perror_plus("Failed to raise privileges in order to"
1184
" kill helper program");
1185
}
1186
if(kill(pid, SIGTERM) == -1){
1187
perror_plus("kill");
1188
}
1189
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1190
perror_plus("Failed to lower privileges after killing"
1191
" helper program");
1192
}
1193
return false;
1194
}
1195
} while(pret == -1 and errno == EINTR);
1196
if(pret == -1){
1197
perror_plus("waitpid");
1198
return false;
1199
}
1200
if(WIFEXITED(status)){
1201
if(WEXITSTATUS(status) != 0){
1202
fprintf_plus(stderr, "Error: iprouteadddel exited"
1203
" with status %d\n", WEXITSTATUS(status));
1204
return false;
1205
}
1206
return true;
1207
}
1208
if(WIFSIGNALED(status)){
1209
fprintf_plus(stderr, "Error: iprouteadddel died by"
1210
" signal %d\n", WTERMSIG(status));
1211
return false;
1212
}
1213
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1214
return false;
1215
}
1216
1217
__attribute__((nonnull, warn_unused_result))
1218
static bool add_local_route(const char *address,
1219
AvahiIfIndex if_index){
1220
if(debug){
1221
fprintf_plus(stderr, "Adding route to %s\n", address);
1222
}
1223
return add_delete_local_route(true, address, if_index);
1224
}
1225
1226
__attribute__((nonnull, warn_unused_result))
1227
static bool delete_local_route(const char *address,
1228
AvahiIfIndex if_index){
1229
if(debug){
1230
fprintf_plus(stderr, "Removing route to %s\n", address);
1231
}
1232
return add_delete_local_route(false, address, if_index);
1233
}
1234
1235
623
/* Called when a Mandos server is found */
1236
__attribute__((nonnull, warn_unused_result))
1237
624
static int start_mandos_communication(const char *ip, in_port_t port,
1238
625
AvahiIfIndex if_index,
1239
626
int af, mandos_context *mc){
1240
627
int ret, tcp_sd = -1;
1241
628
ssize_t sret;
1242
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1243
633
char *buffer = NULL;
1244
634
char *decrypted_buffer = NULL;
1245
635
size_t buffer_length = 0;
1248
638
int retval = -1;
1249
639
gnutls_session_t session;
1250
640
int pf; /* Protocol family */
1251
bool route_added = false;
1252
641
1253
642
errno = 0;
1254
643
1270
659
return -1;
1271
660
}
1272
661
1273
/* If the interface is specified and we have a list of interfaces */
1274
662
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1275
663
/* Check if the interface is one of the interfaces we are using */
1276
664
bool match = false;
1277
665
{
1278
666
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
1282
669
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
670
match = true;
1284
671
break;
1286
673
}
1287
674
}
1288
675
if(not match){
1289
/* This interface does not match any in the list, so we don't
1290
connect to the server */
1291
676
if(debug){
1292
677
char interface[IF_NAMESIZE];
1293
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1313
698
PRIuMAX "\n", ip, (uintmax_t)port);
1314
699
}
1315
700
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
1317
702
if(tcp_sd < 0){
1318
703
int e = errno;
1319
704
perror_plus("socket");
1326
711
goto mandos_end;
1327
712
}
1328
713
714
memset(&to, 0, sizeof(to));
1329
715
if(af == AF_INET6){
1330
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1331
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1332
ret = inet_pton(af, ip, &to6->sin6_addr);
716
to.in6.sin6_family = (sa_family_t)af;
717
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1333
718
} else { /* IPv4 */
1334
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1335
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1336
ret = inet_pton(af, ip, &to4->sin_addr);
719
to.in.sin_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in.sin_addr);
1337
721
}
1338
722
if(ret < 0 ){
1339
723
int e = errno;
1348
732
goto mandos_end;
1349
733
}
1350
734
if(af == AF_INET6){
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
735
to.in6.sin6_port = htons(port);
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
738
-Wunreachable-code*/
1354
739
if(if_index == AVAHI_IF_UNSPEC){
1355
740
fprintf_plus(stderr, "An IPv6 link-local address is"
1356
741
" incomplete without a network interface\n");
1358
743
goto mandos_end;
1359
744
}
1360
745
/* Set the network interface number as scope */
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
746
to.in6.sin6_scope_id = (uint32_t)if_index;
1362
747
}
1363
748
} else {
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
749
to.in.sin_port = htons(port); /* Spurious warnings from
750
-Wconversion and
751
-Wunreachable-code */
1365
752
}
1366
753
1367
754
if(quit_now){
1384
771
}
1385
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1386
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1387
if(af == AF_INET6){
1388
ret = getnameinfo((struct sockaddr *)&to,
1389
sizeof(struct sockaddr_in6),
1390
addrstr, sizeof(addrstr), NULL, 0,
1391
NI_NUMERICHOST);
1392
} else {
1393
ret = getnameinfo((struct sockaddr *)&to,
1394
sizeof(struct sockaddr_in),
1395
addrstr, sizeof(addrstr), NULL, 0,
1396
NI_NUMERICHOST);
1397
}
1398
if(ret == EAI_SYSTEM){
1399
perror_plus("getnameinfo");
1400
} else if(ret != 0) {
1401
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1402
} else if(strcmp(addrstr, ip) != 0){
1403
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1404
}
1405
}
1406
1407
if(quit_now){
1408
errno = EINTR;
1409
goto mandos_end;
1410
}
1411
1412
while(true){
1413
if(af == AF_INET6){
1414
ret = connect(tcp_sd, (struct sockaddr *)&to,
1415
sizeof(struct sockaddr_in6));
1416
} else {
1417
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1418
sizeof(struct sockaddr_in));
1419
}
1420
if(ret < 0){
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1422
and if_index != AVAHI_IF_UNSPEC
1423
and connect_to == NULL
1424
and not route_added and
1425
((af == AF_INET6 and not
1426
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1427
&to)->sin6_addr)))
1428
or (af == AF_INET and
1429
/* Not a a IPv4LL address */
1430
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1431
& 0xFFFF0000L) != 0xA9FE0000L))){
1432
/* Work around Avahi bug - Avahi does not announce link-local
1433
addresses if it has a global address, so local hosts with
1434
*only* a link-local address (e.g. Mandos clients) cannot
1435
connect to a Mandos server announced by Avahi on a server
1436
host with a global address. Work around this by retrying
1437
with an explicit route added with the server's address.
1438
1439
Avahi bug reference:
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1441
https://bugs.debian.org/587961
1442
*/
1443
if(debug){
1444
fprintf_plus(stderr, "Mandos server unreachable, trying"
1445
" direct route\n");
1446
}
1447
int e = errno;
1448
route_added = add_local_route(ip, if_index);
1449
if(route_added){
1450
continue;
1451
}
1452
errno = e;
1453
}
1454
if(errno != ECONNREFUSED or debug){
1455
int e = errno;
1456
perror_plus("connect");
1457
errno = e;
1458
}
1459
goto mandos_end;
1460
}
1461
1462
if(quit_now){
1463
errno = EINTR;
1464
goto mandos_end;
1465
}
1466
break;
774
const char *pcret;
775
if(af == AF_INET6){
776
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
777
sizeof(addrstr));
778
} else {
779
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
780
sizeof(addrstr));
781
}
782
if(pcret == NULL){
783
perror_plus("inet_ntop");
784
} else {
785
if(strcmp(addrstr, ip) != 0){
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
787
}
788
}
789
}
790
791
if(quit_now){
792
errno = EINTR;
793
goto mandos_end;
794
}
795
796
if(af == AF_INET6){
797
ret = connect(tcp_sd, &to.in6, sizeof(to));
798
} else {
799
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
800
}
801
if(ret < 0){
802
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
803
int e = errno;
804
perror_plus("connect");
805
errno = e;
806
}
807
goto mandos_end;
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
1467
813
}
1468
814
1469
815
const char *out = mandos_protocol_version;
1623
969
&decrypted_buffer, mc);
1624
970
if(decrypted_buffer_size >= 0){
1625
971
1626
clearerr(stdout);
1627
972
written = 0;
1628
973
while(written < (size_t) decrypted_buffer_size){
1629
974
if(quit_now){
1645
990
}
1646
991
written += (size_t)ret;
1647
992
}
1648
ret = fflush(stdout);
1649
if(ret != 0){
1650
int e = errno;
1651
if(debug){
1652
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1653
strerror(errno));
1654
}
1655
errno = e;
1656
goto mandos_end;
1657
}
1658
993
retval = 0;
1659
994
}
1660
995
}
1663
998
1664
999
mandos_end:
1665
1000
{
1666
if(route_added){
1667
if(not delete_local_route(ip, if_index)){
1668
fprintf_plus(stderr, "Failed to delete local route to %s on"
1669
" interface %d", ip, if_index);
1670
}
1671
}
1672
1001
int e = errno;
1673
1002
free(decrypted_buffer);
1674
1003
free(buffer);
1675
1004
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
1005
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1677
1006
}
1678
1007
if(ret == -1){
1679
1008
if(e == 0){
1704
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
1705
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1706
1035
flags,
1707
void *mc){
1036
void* mc){
1708
1037
if(r == NULL){
1709
1038
return;
1710
1039
}
1713
1042
timed out */
1714
1043
1715
1044
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1717
1045
return;
1718
1046
}
1719
1047
1764
1092
const char *domain,
1765
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1766
1094
flags,
1767
void *mc){
1095
void* mc){
1768
1096
if(b == NULL){
1769
1097
return;
1770
1098
}
1830
1158
errno = old_errno;
1831
1159
}
1832
1160
1833
__attribute__((nonnull, warn_unused_result))
1834
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
1162
int ret;
1836
int old_errno;
1163
error_t ret_errno;
1837
1164
1838
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
1166
if(s < 0){
1840
old_errno = errno;
1167
ret_errno = errno;
1841
1168
perror_plus("socket");
1842
errno = old_errno;
1169
errno = ret_errno;
1843
1170
return false;
1844
1171
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1172
strcpy(ifr->ifr_name, ifname);
1847
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
1174
if(ret == -1){
1849
1175
if(debug){
1850
old_errno = errno;
1176
ret_errno = errno;
1851
1177
perror_plus("ioctl SIOCGIFFLAGS");
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1178
errno = ret_errno;
1858
1179
}
1859
1180
return false;
1860
1181
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1182
return true;
1867
1183
}
1868
1184
1869
__attribute__((nonnull, warn_unused_result))
1870
1185
bool good_flags(const char *ifname, const struct ifreq *ifr){
1871
1186
1872
1187
/* Reject the loopback device */
1914
1229
* corresponds to an acceptable network device.
1915
1230
* (This function is passed to scandir(3) as a filter function.)
1916
1231
*/
1917
__attribute__((nonnull, warn_unused_result))
1918
1232
int good_interface(const struct dirent *if_entry){
1919
1233
if(if_entry->d_name[0] == '.'){
1920
1234
return 0;
1938
1252
/*
1939
1253
* This function determines if a network interface is up.
1940
1254
*/
1941
__attribute__((nonnull, warn_unused_result))
1942
1255
bool interface_is_up(const char *interface){
1943
1256
struct ifreq ifr;
1944
1257
if(not get_flags(interface, &ifr)){
1955
1268
/*
1956
1269
* This function determines if a network interface is running
1957
1270
*/
1958
__attribute__((nonnull, warn_unused_result))
1959
1271
bool interface_is_running(const char *interface){
1960
1272
struct ifreq ifr;
1961
1273
if(not get_flags(interface, &ifr)){
1969
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1970
1282
}
1971
1283
1972
__attribute__((nonnull, pure, warn_unused_result))
1973
1284
int notdotentries(const struct dirent *direntry){
1974
1285
/* Skip "." and ".." */
1975
1286
if(direntry->d_name[0] == '.'
1982
1293
}
1983
1294
1984
1295
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1986
1296
int runnable_hook(const struct dirent *direntry){
1987
1297
int ret;
1988
1298
size_t sret;
1996
1306
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1997
1307
"abcdefghijklmnopqrstuvwxyz"
1998
1308
"0123456789"
1999
"_.-");
1309
"_-");
2000
1310
if((direntry->d_name)[sret] != '\0'){
2001
1311
/* Contains non-allowed characters */
2002
1312
if(debug){
2006
1316
return 0;
2007
1317
}
2008
1318
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1321
if(ret < 0){
1322
perror_plus("asprintf");
1323
return 0;
1324
}
1325
1326
ret = stat(fullname, &st);
2010
1327
if(ret == -1){
2011
1328
if(debug){
2012
1329
perror_plus("Could not stat hook");
2036
1353
return 1;
2037
1354
}
2038
1355
2039
__attribute__((nonnull, warn_unused_result))
2040
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2041
1357
mandos_context *mc){
2042
1358
int ret;
2046
1362
2047
1363
while(true){
2048
1364
if(mc->current_server == NULL){
2049
if(debug){
1365
if (debug){
2050
1366
fprintf_plus(stderr, "Wait until first server is found."
2051
1367
" No timeout!\n");
2052
1368
}
2053
1369
ret = avahi_simple_poll_iterate(s, -1);
2054
1370
} else {
2055
if(debug){
1371
if (debug){
2056
1372
fprintf_plus(stderr, "Check current_server if we should run"
2057
1373
" it, or wait\n");
2058
1374
}
2075
1391
- ((intmax_t)waited_time.tv_sec * 1000))
2076
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
2077
1393
2078
if(debug){
1394
if (debug){
2079
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2080
1396
block_time);
2081
1397
}
2103
1419
ret = avahi_simple_poll_iterate(s, (int)block_time);
2104
1420
}
2105
1421
if(ret != 0){
2106
if(ret > 0 or errno != EINTR){
1422
if (ret > 0 or errno != EINTR){
2107
1423
return (ret != 1) ? ret : 0;
2108
1424
}
2109
1425
}
2110
1426
}
2111
1427
}
2112
1428
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
bool run_network_hooks(const char *mode, const char *interface,
2115
1482
const float delay){
2116
struct dirent **direntries = NULL;
2117
if(hookdir_fd == -1){
2118
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2119
| O_CLOEXEC);
2120
if(hookdir_fd == -1){
2121
if(errno == ENOENT){
2122
if(debug){
2123
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2124
" found\n", hookdir);
2125
}
2126
} else {
2127
perror_plus("open");
2128
}
2129
return;
2130
}
2131
}
2132
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2133
if(devnull == -1){
2134
perror_plus("open(\"/dev/null\", O_RDONLY)");
2135
return;
2136
}
2137
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
runnable_hook, alphasort);
1483
struct dirent **direntries;
1484
struct dirent *direntry;
1485
int ret;
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1487
alphasort);
2139
1488
if(numhooks == -1){
2140
perror_plus("scandir");
2141
close(devnull);
2142
return;
2143
}
2144
struct dirent *direntry;
2145
int ret;
2146
for(int i = 0; i < numhooks; i++){
2147
direntry = direntries[i];
2148
if(debug){
2149
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2150
direntry->d_name);
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
2151
1496
}
2152
pid_t hook_pid = fork();
2153
if(hook_pid == 0){
2154
/* Child */
2155
/* Raise privileges */
2156
errno = raise_privileges_permanently();
2157
if(errno != 0){
2158
perror_plus("Failed to raise privileges");
2159
_exit(EX_NOPERM);
2160
}
2161
/* Set group */
2162
errno = 0;
2163
ret = setgid(0);
2164
if(ret == -1){
2165
perror_plus("setgid");
2166
_exit(EX_NOPERM);
2167
}
2168
/* Reset supplementary groups */
2169
errno = 0;
2170
ret = setgroups(0, NULL);
2171
if(ret == -1){
2172
perror_plus("setgroups");
2173
_exit(EX_NOPERM);
2174
}
2175
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2176
if(ret == -1){
2177
perror_plus("setenv");
2178
_exit(EX_OSERR);
2179
}
2180
ret = setenv("DEVICE", interface, 1);
2181
if(ret == -1){
2182
perror_plus("setenv");
2183
_exit(EX_OSERR);
2184
}
2185
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2186
if(ret == -1){
2187
perror_plus("setenv");
2188
_exit(EX_OSERR);
2189
}
2190
ret = setenv("MODE", mode, 1);
2191
if(ret == -1){
2192
perror_plus("setenv");
2193
_exit(EX_OSERR);
2194
}
2195
char *delaystring;
2196
ret = asprintf(&delaystring, "%f", (double)delay);
2197
if(ret == -1){
1497
} else {
1498
int devnull = open("/dev/null", O_RDONLY);
1499
for(int i = 0; i < numhooks; i++){
1500
direntry = direntries[i];
1501
char *fullname = NULL;
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1503
if(ret < 0){
2198
1504
perror_plus("asprintf");
2199
_exit(EX_OSERR);
2200
}
2201
ret = setenv("DELAY", delaystring, 1);
2202
if(ret == -1){
1505
continue;
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1511
pid_t hook_pid = fork();
1512
if(hook_pid == 0){
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1528
dup2(devnull, STDIN_FILENO);
1529
close(devnull);
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1532
if(ret == -1){
1533
perror_plus("setenv");
1534
_exit(EX_OSERR);
1535
}
1536
ret = setenv("DEVICE", interface, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1542
if(ret == -1){
1543
perror_plus("setenv");
1544
_exit(EX_OSERR);
1545
}
1546
ret = setenv("MODE", mode, 1);
1547
if(ret == -1){
1548
perror_plus("setenv");
1549
_exit(EX_OSERR);
1550
}
1551
char *delaystring;
1552
ret = asprintf(&delaystring, "%f", delay);
1553
if(ret == -1){
1554
perror_plus("asprintf");
1555
_exit(EX_OSERR);
1556
}
1557
ret = setenv("DELAY", delaystring, 1);
1558
if(ret == -1){
1559
free(delaystring);
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
2203
1563
free(delaystring);
2204
perror_plus("setenv");
2205
_exit(EX_OSERR);
2206
}
2207
free(delaystring);
2208
if(connect_to != NULL){
2209
ret = setenv("CONNECT", connect_to, 1);
2210
if(ret == -1){
2211
perror_plus("setenv");
2212
_exit(EX_OSERR);
2213
}
2214
}
2215
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2216
direntry->d_name,
2217
O_RDONLY));
2218
if(hook_fd == -1){
2219
perror_plus("openat");
2220
_exit(EXIT_FAILURE);
2221
}
2222
if(close(hookdir_fd) == -1){
2223
perror_plus("close");
2224
_exit(EXIT_FAILURE);
2225
}
2226
ret = dup2(devnull, STDIN_FILENO);
2227
if(ret == -1){
2228
perror_plus("dup2(devnull, STDIN_FILENO)");
2229
_exit(EX_OSERR);
2230
}
2231
ret = close(devnull);
2232
if(ret == -1){
2233
perror_plus("close");
2234
_exit(EX_OSERR);
2235
}
2236
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2237
if(ret == -1){
2238
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2239
_exit(EX_OSERR);
2240
}
2241
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2242
environ) == -1){
2243
perror_plus("fexecve");
2244
_exit(EXIT_FAILURE);
2245
}
2246
} else {
2247
if(hook_pid == -1){
2248
perror_plus("fork");
2249
free(direntry);
2250
continue;
2251
}
2252
int status;
2253
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2254
perror_plus("waitpid");
2255
free(direntry);
2256
continue;
2257
}
2258
if(WIFEXITED(status)){
2259
if(WEXITSTATUS(status) != 0){
2260
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2261
" with status %d\n", direntry->d_name,
2262
WEXITSTATUS(status));
2263
free(direntry);
2264
continue;
2265
}
2266
} else if(WIFSIGNALED(status)){
2267
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2268
" signal %d\n", direntry->d_name,
2269
WTERMSIG(status));
2270
free(direntry);
2271
continue;
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
2272
1575
} else {
2273
fprintf_plus(stderr, "Warning: network hook \"%s\""
2274
" crashed\n", direntry->d_name);
2275
free(direntry);
2276
continue;
2277
}
2278
}
2279
if(debug){
2280
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2281
direntry->d_name);
2282
}
2283
free(direntry);
2284
}
2285
free(direntries);
2286
if(close(hookdir_fd) == -1){
2287
perror_plus("close");
2288
} else {
2289
hookdir_fd = -1;
2290
}
2291
close(devnull);
1576
int status;
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1578
perror_plus("waitpid");
1579
free(fullname);
1580
continue;
1581
}
1582
if(WIFEXITED(status)){
1583
if(WEXITSTATUS(status) != 0){
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1587
free(fullname);
1588
continue;
1589
}
1590
} else if(WIFSIGNALED(status)){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1594
free(fullname);
1595
continue;
1596
} else {
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1599
free(fullname);
1600
continue;
1601
}
1602
}
1603
free(fullname);
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1607
}
1608
}
1609
close(devnull);
1610
}
1611
return true;
2292
1612
}
2293
1613
2294
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2296
const float delay){
2297
int old_errno = errno;
2298
int ret;
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
2299
1620
struct ifreq network;
2300
1621
unsigned int if_index = if_nametoindex(interface);
2301
1622
if(if_index == 0){
2310
1631
}
2311
1632
2312
1633
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network)){
1634
if(not get_flags(interface, &network) and debug){
2316
1635
ret_errno = errno;
2317
1636
fprintf_plus(stderr, "Failed to get flags for interface "
2318
1637
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
1638
return ret_errno;
2321
1639
}
2322
network.ifr_flags |= IFF_UP; /* set flag */
1640
network.ifr_flags |= IFF_UP;
2323
1641
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
2326
1644
ret_errno = errno;
2327
1645
perror_plus("socket");
2328
1646
errno = old_errno;
2329
1647
return ret_errno;
2330
1648
}
2331
1649
2332
1650
if(quit_now){
2333
ret = close(sd);
2334
if(ret == -1){
2335
perror_plus("close");
2336
}
1651
close(sd);
2337
1652
errno = old_errno;
2338
1653
return EINTR;
2339
1654
}
2343
1658
interface);
2344
1659
}
2345
1660
2346
/* Raise privileges */
2347
ret_errno = raise_privileges();
2348
if(ret_errno != 0){
2349
errno = ret_errno;
2350
perror_plus("Failed to raise privileges");
2351
}
1661
/* Raise priviliges */
1662
raise_privileges();
2352
1663
2353
1664
#ifdef __linux__
2354
int ret_linux;
2355
bool restore_loglevel = false;
2356
if(ret_errno == 0){
2357
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2358
messages about the network interface to mess up the prompt */
2359
ret_linux = klogctl(8, NULL, 5);
2360
if(ret_linux == -1){
2361
perror_plus("klogctl");
2362
} else {
2363
restore_loglevel = true;
2364
}
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
2365
1672
}
2366
1673
#endif /* __linux__ */
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
2369
1676
#ifdef __linux__
2370
1677
if(restore_loglevel){
2371
1678
ret_linux = klogctl(7, NULL, 0);
2375
1682
}
2376
1683
#endif /* __linux__ */
2377
1684
2378
/* If raise_privileges() succeeded above */
2379
if(ret_errno == 0){
2380
/* Lower privileges */
2381
ret_errno = lower_privileges();
2382
if(ret_errno != 0){
2383
errno = ret_errno;
2384
perror_plus("Failed to lower privileges");
2385
}
2386
}
1685
/* Lower privileges */
1686
lower_privileges();
2387
1687
2388
1688
/* Close the socket */
2389
ret = close(sd);
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2390
1690
if(ret == -1){
2391
1691
perror_plus("close");
2392
1692
}
2393
1693
2394
1694
if(ret_setflags == -1){
2395
errno = ioctl_errno;
1695
errno = ret_errno;
2396
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2397
1697
errno = old_errno;
2398
return ioctl_errno;
1698
return ret_errno;
2399
1699
}
2400
1700
} else if(debug){
2401
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2404
1704
2405
1705
/* Sleep checking until interface is running.
2406
1706
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
1707
for(int i=0; i < delay * 4; i++){
2408
1708
if(interface_is_running(interface)){
2409
1709
break;
2410
1710
}
2419
1719
return 0;
2420
1720
}
2421
1721
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
2425
1727
struct ifreq network;
2426
1728
unsigned int if_index = if_nametoindex(interface);
2427
1729
if(if_index == 0){
2430
1732
return ENXIO;
2431
1733
}
2432
1734
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
2435
1735
if(not get_flags(interface, &network) and debug){
2436
1736
ret_errno = errno;
2437
1737
fprintf_plus(stderr, "Failed to get flags for interface "
2438
1738
"\"%s\"\n", interface);
2439
errno = old_errno;
2440
1739
return ret_errno;
2441
1740
}
2442
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2443
1742
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2445
if(sd == -1){
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
2446
1745
ret_errno = errno;
2447
1746
perror_plus("socket");
2448
1747
errno = old_errno;
2454
1753
interface);
2455
1754
}
2456
1755
2457
/* Raise privileges */
2458
ret_errno = raise_privileges();
2459
if(ret_errno != 0){
2460
errno = ret_errno;
2461
perror_plus("Failed to raise privileges");
2462
}
2463
2464
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2465
ioctl_errno = errno;
2466
2467
/* If raise_privileges() succeeded above */
2468
if(ret_errno == 0){
2469
/* Lower privileges */
2470
ret_errno = lower_privileges();
2471
if(ret_errno != 0){
2472
errno = ret_errno;
2473
perror_plus("Failed to lower privileges");
2474
}
2475
}
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
2476
1764
2477
1765
/* Close the socket */
2478
int ret = close(sd);
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2479
1767
if(ret == -1){
2480
1768
perror_plus("close");
2481
1769
}
2482
1770
2483
1771
if(ret_setflags == -1){
2484
errno = ioctl_errno;
1772
errno = ret_errno;
2485
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2486
1774
errno = old_errno;
2487
return ioctl_errno;
1775
return ret_errno;
2488
1776
}
2489
1777
} else if(debug){
2490
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2496
1784
}
2497
1785
2498
1786
int main(int argc, char *argv[]){
2499
mandos_context mc = { .server = NULL, .dh_bits = 0,
2500
#if GNUTLS_VERSION_NUMBER >= 0x030606
2501
.priority = "SECURE128:!CTYPE-X.509"
2502
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2503
":%PROFILE_ULTRA",
2504
#elif GNUTLS_VERSION_NUMBER < 0x030600
2505
.priority = "SECURE256:!CTYPE-X.509"
2506
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2507
#else
2508
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2509
#endif
2510
.current_server = NULL, .interfaces = NULL,
2511
.interfaces_size = 0 };
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
2512
1791
AvahiSServiceBrowser *sb = NULL;
2513
1792
error_t ret_errno;
2514
1793
int ret;
2517
1796
int exitcode = EXIT_SUCCESS;
2518
1797
char *interfaces_to_take_down = NULL;
2519
1798
size_t interfaces_to_take_down_size = 0;
2520
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2521
char old_tempdir[] = "/tmp/mandosXXXXXX";
2522
char *tempdir = NULL;
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1800
bool tempdir_created = false;
2523
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
1802
const char *seckey = PATHDIR "/" SECKEY;
2525
1803
const char *pubkey = PATHDIR "/" PUBKEY;
2526
#if GNUTLS_VERSION_NUMBER >= 0x030606
2527
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2528
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2529
#endif
2530
const char *dh_params_file = NULL;
2531
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
2532
1806
2533
1807
bool gnutls_initialized = false;
2534
1808
bool gpgme_initialized = false;
2580
1854
{ .name = "pubkey", .key = 'p',
2581
1855
.arg = "FILE",
2582
1856
.doc = "OpenPGP public key file base name",
2583
.group = 1 },
2584
{ .name = "tls-privkey", .key = 't',
2585
.arg = "FILE",
2586
#if GNUTLS_VERSION_NUMBER >= 0x030606
2587
.doc = "TLS private key file base name",
2588
#else
2589
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2590
#endif
2591
.group = 1 },
2592
{ .name = "tls-pubkey", .key = 'T',
2593
.arg = "FILE",
2594
#if GNUTLS_VERSION_NUMBER >= 0x030606
2595
.doc = "TLS public key file base name",
2596
#else
2597
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2598
#endif
2599
.group = 1 },
1857
.group = 2 },
2600
1858
{ .name = "dh-bits", .key = 129,
2601
1859
.arg = "BITS",
2602
1860
.doc = "Bit length of the prime number used in the"
2603
1861
" Diffie-Hellman key exchange",
2604
1862
.group = 2 },
2605
{ .name = "dh-params", .key = 134,
2606
.arg = "FILE",
2607
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2608
" for the Diffie-Hellman key exchange",
2609
.group = 2 },
2610
1863
{ .name = "priority", .key = 130,
2611
1864
.arg = "STRING",
2612
1865
.doc = "GnuTLS priority string for the TLS handshake",
2658
1911
case 'p': /* --pubkey */
2659
1912
pubkey = arg;
2660
1913
break;
2661
case 't': /* --tls-privkey */
2662
#if GNUTLS_VERSION_NUMBER >= 0x030606
2663
tls_privkey = arg;
2664
#endif
2665
break;
2666
case 'T': /* --tls-pubkey */
2667
#if GNUTLS_VERSION_NUMBER >= 0x030606
2668
tls_pubkey = arg;
2669
#endif
2670
break;
2671
1914
case 129: /* --dh-bits */
2672
1915
errno = 0;
2673
1916
tmpmax = strtoimax(arg, &tmp, 10);
2677
1920
}
2678
1921
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2679
1922
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
2683
1923
case 130: /* --priority */
2684
1924
mc.priority = arg;
2685
1925
break;
2708
1948
argp_state_help(state, state->out_stream,
2709
1949
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
1950
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
1951
case -3: /* --usage */
2713
1952
argp_state_help(state, state->out_stream,
2714
1953
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
1954
case 'V': /* --version */
2717
1955
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
1956
exit(argp_err_exit_status);
2727
1965
.args_doc = "",
2728
1966
.doc = "Mandos client -- Get and decrypt"
2729
1967
" passwords from a Mandos server" };
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
1968
ret = argp_parse(&argp, argc, argv,
1969
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1970
switch(ret){
2733
1971
case 0:
2734
1972
break;
2735
1973
case ENOMEM:
2736
1974
default:
2737
errno = ret_errno;
1975
errno = ret;
2738
1976
perror_plus("argp_parse");
2739
1977
exitcode = EX_OSERR;
2740
1978
goto end;
2743
1981
goto end;
2744
1982
}
2745
1983
}
2746
1984
2747
1985
{
2748
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2752
perror_plus("Failed to raise privileges");
2753
} else {
1986
/* Work around Debian bug #633582:
1987
<http://bugs.debian.org/633582> */
1988
1989
/* Re-raise priviliges */
1990
if(raise_privileges() == 0){
2754
1991
struct stat st;
2755
1992
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
1994
int seckey_fd = open(seckey, O_RDONLY);
2761
1995
if(seckey_fd == -1){
2773
2007
}
2774
2008
}
2775
2009
}
2776
close(seckey_fd);
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2777
2011
}
2778
2012
}
2779
2013
2780
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2781
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2782
2016
if(pubkey_fd == -1){
2794
2028
}
2795
2029
}
2796
2030
}
2797
close(pubkey_fd);
2798
}
2799
}
2800
2801
if(dh_params_file != NULL
2802
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2803
int dhparams_fd = open(dh_params_file, O_RDONLY);
2804
if(dhparams_fd == -1){
2805
perror_plus("open");
2806
} else {
2807
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2808
if(ret == -1){
2809
perror_plus("fstat");
2810
} else {
2811
if(S_ISREG(st.st_mode)
2812
and st.st_uid == 0 and st.st_gid == 0){
2813
ret = fchown(dhparams_fd, uid, gid);
2814
if(ret == -1){
2815
perror_plus("fchown");
2816
}
2817
}
2818
}
2819
close(dhparams_fd);
2820
}
2821
}
2822
2823
/* Work around Debian bug #981302
2824
<https://bugs.debian.org/981302> */
2825
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2826
ret = symlink("/proc/self/fd", "/dev/fd");
2827
if(ret == -1){
2828
perror_plus("Failed to create /dev/fd symlink");
2829
}
2830
}
2831
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2832
2035
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2836
perror_plus("Failed to lower privileges");
2837
}
2036
lower_privileges();
2838
2037
}
2839
2038
}
2840
2039
2864
2063
goto end;
2865
2064
}
2866
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2867
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2868
}
2869
run_network_hooks("start", interfaces_hooks != NULL ?
2870
interfaces_hooks : "", delay);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
2069
}
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
2072
goto end;
2073
}
2871
2074
}
2872
2075
2873
2076
if(not debug){
2951
2154
2952
2155
/* If no interfaces were specified, make a list */
2953
2156
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2157
struct dirent **direntries;
2955
2158
/* Look for any good interfaces */
2956
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2957
2160
alphasort);
2961
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2962
2165
direntries[i]->d_name);
2963
2166
if(ret_errno != 0){
2964
errno = ret_errno;
2965
2167
perror_plus("argz_add");
2966
free(direntries[i]);
2967
2168
continue;
2968
2169
}
2969
2170
if(debug){
2970
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2971
2172
direntries[i]->d_name);
2972
2173
}
2973
free(direntries[i]);
2974
2174
}
2975
2175
free(direntries);
2976
2176
} else {
2977
if(ret == 0){
2978
free(direntries);
2979
}
2177
free(direntries);
2980
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2981
2179
exitcode = EXIT_FAILURE;
2982
2180
goto end;
2983
2181
}
2984
2182
}
2985
2183
2986
/* Bring up interfaces which are down, and remove any "none"s */
2184
/* Bring up interfaces which are down */
2987
2185
{
2988
2186
char *interface = NULL;
2989
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
3005
2203
break;
3006
2204
}
3007
2205
bool interface_was_up = interface_is_up(interface);
3008
errno = bring_up_interface(interface, delay);
2206
ret = bring_up_interface(interface, delay);
3009
2207
if(not interface_was_up){
3010
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
3013
2211
} else {
3014
errno = argz_add(&interfaces_to_take_down,
3015
&interfaces_to_take_down_size,
3016
interface);
3017
if(errno != 0){
3018
perror_plus("argz_add");
3019
}
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
3020
2215
}
3021
2216
}
3022
2217
}
3038
2233
goto end;
3039
2234
}
3040
2235
3041
#if GNUTLS_VERSION_NUMBER >= 0x030606
3042
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3043
#elif GNUTLS_VERSION_NUMBER < 0x030600
3044
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3045
#else
3046
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3047
#endif
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
3048
2237
if(ret == -1){
3049
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2239
exitcode = EX_UNAVAILABLE;
3057
2246
goto end;
3058
2247
}
3059
2248
3060
/* Try /run/tmp before /tmp */
3061
tempdir = mkdtemp(run_tempdir);
3062
if(tempdir == NULL and errno == ENOENT){
3063
if(debug){
3064
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3065
run_tempdir, old_tempdir);
3066
}
3067
tempdir = mkdtemp(old_tempdir);
3068
}
3069
if(tempdir == NULL){
2249
if(mkdtemp(tempdir) == NULL){
3070
2250
perror_plus("mkdtemp");
3071
2251
goto end;
3072
2252
}
2253
tempdir_created = true;
3073
2254
3074
2255
if(quit_now){
3075
2256
goto end;
3147
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
3148
2329
(int)retry_interval);
3149
2330
}
3150
sleep((unsigned int)retry_interval);
2331
sleep((int)retry_interval);
3151
2332
}
3152
2333
3153
if(not quit_now){
2334
if (not quit_now){
3154
2335
exitcode = EXIT_SUCCESS;
3155
2336
}
3156
2337
3172
2353
3173
2354
/* Allocate a new server */
3174
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2356
&config, NULL, NULL, &ret_errno);
3176
2357
3177
2358
/* Free the Avahi configuration data */
3178
2359
avahi_server_config_free(&config);
3181
2362
/* Check if creating the Avahi server object succeeded */
3182
2363
if(mc.server == NULL){
3183
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
2365
avahi_strerror(ret_errno));
3185
2366
exitcode = EX_UNAVAILABLE;
3186
2367
goto end;
3187
2368
}
3211
2392
if(debug){
3212
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
3213
2394
}
3214
2395
3215
2396
ret = avahi_loop_with_timeout(simple_poll,
3216
2397
(int)(retry_interval * 1000), &mc);
3217
2398
if(debug){
3222
2403
end:
3223
2404
3224
2405
if(debug){
3225
if(signal_received){
3226
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3227
argv[0], signal_received,
3228
strsignal(signal_received));
3229
} else {
3230
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3231
}
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3232
2407
}
3233
2408
3234
2409
/* Cleanup things */
3245
2420
3246
2421
if(gnutls_initialized){
3247
2422
gnutls_certificate_free_credentials(mc.cred);
2423
gnutls_global_deinit();
3248
2424
gnutls_dh_params_deinit(mc.dh_params);
3249
2425
}
3250
2426
3258
2434
mc.current_server->prev->next = NULL;
3259
2435
while(mc.current_server != NULL){
3260
2436
server *next = mc.current_server->next;
3261
#ifdef __GNUC__
3262
#pragma GCC diagnostic push
3263
#pragma GCC diagnostic ignored "-Wcast-qual"
3264
#endif
3265
free((char *)(mc.current_server->ip));
3266
#ifdef __GNUC__
3267
#pragma GCC diagnostic pop
3268
#endif
3269
2437
free(mc.current_server);
3270
2438
mc.current_server = next;
3271
2439
}
3272
2440
}
3273
2441
3274
/* Re-raise privileges */
2442
/* Re-raise priviliges */
3275
2443
{
3276
ret = raise_privileges();
3277
if(ret != 0){
3278
errno = ret;
3279
perror_plus("Failed to raise privileges");
3280
} else {
3281
3282
/* Run network hooks */
3283
run_network_hooks("stop", interfaces_hooks != NULL ?
3284
interfaces_hooks : "", delay);
3285
3286
/* Take down the network interfaces which were brought up */
3287
{
3288
char *interface = NULL;
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3291
interface))){
3292
ret = take_down_interface(interface);
3293
if(ret != 0){
3294
errno = ret;
3295
perror_plus("Failed to take down interface");
3296
}
3297
}
3298
if(debug and (interfaces_to_take_down == NULL)){
3299
fprintf_plus(stderr, "No interfaces needed to be taken"
3300
" down\n");
3301
}
3302
}
3303
}
3304
3305
ret = lower_privileges_permanently();
3306
if(ret != 0){
3307
errno = ret;
3308
perror_plus("Failed to lower privileges permanently");
3309
}
2444
raise_privileges();
2445
2446
/* Run network hooks */
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2449
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2460
}
2461
}
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2465
}
2466
}
2467
2468
lower_privileges_permanently();
3310
2469
}
3311
2470
3312
2471
free(interfaces_to_take_down);
3313
2472
free(interfaces_hooks);
3314
2473
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
2474
/* Removes the GPGME temp directory and all files inside */
2475
if(tempdir_created){
3317
2476
struct dirent **direntries = NULL;
3318
int dret;
3319
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3320
O_RDONLY
3321
| O_NOFOLLOW
3322
| O_DIRECTORY
3323
| O_PATH));
3324
if(dir_fd == -1){
3325
perror_plus("open");
3326
return;
3327
}
3328
int numentries = scandirat(dir_fd, ".", &direntries,
3329
notdotentries, alphasort);
3330
if(numentries >= 0){
2477
struct dirent *direntry = NULL;
2478
int numentries = scandir(tempdir, &direntries, notdotentries,
2479
alphasort);
2480
if (numentries > 0){
3331
2481
for(int i = 0; i < numentries; i++){
3332
if(debug){
3333
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3334
dirname, direntries[i]->d_name);
3335
}
3336
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3337
if(dret == -1){
3338
if(errno == EISDIR){
3339
dret = unlinkat(dir_fd, direntries[i]->d_name,
3340
AT_REMOVEDIR);
3341
}
3342
if((dret == -1) and (errno == ENOTEMPTY)
3343
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3344
== 0) and (level == 0)){
3345
/* Recurse only in this special case */
3346
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3347
dret = 0;
3348
}
3349
if((dret == -1) and (errno != ENOENT)){
3350
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3351
direntries[i]->d_name, strerror(errno));
3352
}
3353
}
3354
free(direntries[i]);
3355
}
3356
3357
/* need to clean even if 0 because man page doesn't specify */
3358
free(direntries);
3359
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3360
if(dret == -1 and errno != ENOENT){
3361
perror_plus("rmdir");
3362
}
3363
} else {
3364
perror_plus("scandirat");
3365
}
3366
close(dir_fd);
3367
}
3368
3369
/* Removes the GPGME temp directory and all files inside */
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2482
direntry = direntries[i];
2483
char *fullname = NULL;
2484
ret = asprintf(&fullname, "%s/%s", tempdir,
2485
direntry->d_name);
2486
if(ret < 0){
2487
perror_plus("asprintf");
2488
continue;
2489
}
2490
ret = remove(fullname);
2491
if(ret == -1){
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2494
}
2495
free(fullname);
2496
}
2497
}
2498
2499
/* need to clean even if 0 because man page doesn't specify */
2500
free(direntries);
2501
if (numentries == -1){
2502
perror_plus("scandir");
2503
}
2504
ret = rmdir(tempdir);
2505
if(ret == -1 and errno != ENOENT){
2506
perror_plus("rmdir");
2507
}
3372
2508
}
3373
2509
3374
2510
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0