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237.7.148
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
- 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 © 2008-2021 Teddy Hogeborn
13
* Copyright © 2008-2021 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
203
154
204
155
/* Used for passing in values through the Avahi callback functions */
205
156
typedef struct {
157
AvahiSimplePoll *simple_poll;
206
158
AvahiServer *server;
207
159
gnutls_certificate_credentials_t cred;
208
160
unsigned int dh_bits;
210
162
const char *priority;
211
163
gpgme_ctx_t ctx;
212
164
server *current_server;
213
char *interfaces;
214
size_t interfaces_size;
215
165
} mandos_context;
216
166
217
/* global so signal handler can reach it*/
218
AvahiSimplePoll *simple_poll;
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
219
172
220
173
sig_atomic_t quit_now = 0;
221
174
int signal_received = 0;
229
182
perror(print_text);
230
183
}
231
184
232
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
__attribute__((format (gnu_printf, 2, 3)))
233
186
int fprintf_plus(FILE *stream, const char *format, ...){
234
187
va_list ap;
235
188
va_start (ap, format);
236
189
237
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
238
191
program_invocation_short_name));
239
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
240
193
}
241
194
242
195
/*
244
197
* bytes. "buffer_capacity" is how much is currently allocated,
245
198
* "buffer_length" is how much is already used.
246
199
*/
247
__attribute__((nonnull, warn_unused_result))
248
200
size_t incbuffer(char **buffer, size_t buffer_length,
249
201
size_t buffer_capacity){
250
202
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;
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
257
205
return 0;
258
206
}
259
*buffer = new_buf;
260
207
buffer_capacity += BUFFER_SIZE;
261
208
}
262
209
return buffer_capacity;
263
210
}
264
211
265
212
/* Add server to set of servers to retry periodically */
266
__attribute__((nonnull, warn_unused_result))
267
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
268
int af, server **current_server){
214
int af){
269
215
int ret;
270
216
server *new_server = malloc(sizeof(server));
271
217
if(new_server == NULL){
278
224
.af = af };
279
225
if(new_server->ip == NULL){
280
226
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
227
return false;
297
228
}
298
229
/* Special case of first server */
299
if(*current_server == NULL){
230
if (mc.current_server == NULL){
300
231
new_server->next = new_server;
301
232
new_server->prev = new_server;
302
*current_server = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
303
235
} else {
304
/* Place the new server last in the list */
305
new_server->next = *current_server;
306
new_server->prev = (*current_server)->prev;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
307
238
new_server->prev->next = new_server;
308
(*current_server)->prev = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
309
245
}
310
246
return true;
311
247
}
312
248
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
249
/*
366
250
* Initialize GPGME.
367
251
*/
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){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
373
254
gpgme_error_t rc;
374
255
gpgme_engine_info_t engine_info;
375
256
257
376
258
/*
377
259
* Helper function to insert pub and seckey to the engine keyring.
378
260
*/
379
bool import_key(const char * const filename){
261
bool import_key(const char *filename){
380
262
int ret;
381
263
int fd;
382
264
gpgme_data_t pgp_data;
387
269
return false;
388
270
}
389
271
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
272
rc = gpgme_data_new_from_fd(&pgp_data, fd);
440
273
if(rc != GPG_ERR_NO_ERROR){
441
274
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
443
276
return false;
444
277
}
445
278
446
rc = gpgme_op_import(mc->ctx, pgp_data);
279
rc = gpgme_op_import(mc.ctx, pgp_data);
447
280
if(rc != GPG_ERR_NO_ERROR){
448
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
449
282
gpgme_strsource(rc), gpgme_strerror(rc));
450
283
return false;
451
284
}
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
285
528
ret = close(fd);
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
529
287
if(ret == -1){
530
288
perror_plus("close");
531
289
}
568
326
}
569
327
570
328
/* Create new GPGME "context" */
571
rc = gpgme_new(&(mc->ctx));
329
rc = gpgme_new(&(mc.ctx));
572
330
if(rc != GPG_ERR_NO_ERROR){
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
575
334
return false;
576
335
}
577
336
586
345
* Decrypt OpenPGP data.
587
346
* Returns -1 on error
588
347
*/
589
__attribute__((nonnull, warn_unused_result))
590
348
static ssize_t pgp_packet_decrypt(const char *cryptotext,
591
349
size_t crypto_size,
592
char **plaintext,
593
mandos_context *mc){
350
char **plaintext){
594
351
gpgme_data_t dh_crypto, dh_plain;
595
352
gpgme_error_t rc;
596
353
ssize_t ret;
613
370
/* Create new empty GPGME data buffer for the plaintext */
614
371
rc = gpgme_data_new(&dh_plain);
615
372
if(rc != GPG_ERR_NO_ERROR){
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
617
375
gpgme_strsource(rc), gpgme_strerror(rc));
618
376
gpgme_data_release(dh_crypto);
619
377
return -1;
621
379
622
380
/* Decrypt data from the cryptotext data buffer to the plaintext
623
381
data buffer */
624
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
625
383
if(rc != GPG_ERR_NO_ERROR){
626
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
627
385
gpgme_strsource(rc), gpgme_strerror(rc));
628
386
plaintext_length = -1;
629
387
if(debug){
630
388
gpgme_decrypt_result_t result;
631
result = gpgme_op_decrypt_result(mc->ctx);
389
result = gpgme_op_decrypt_result(mc.ctx);
632
390
if(result == NULL){
633
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
634
392
} 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");
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
641
397
if(result->file_name != NULL){
642
398
fprintf_plus(stderr, "File name: %s\n", result->file_name);
643
399
}
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
400
gpgme_recipient_t recipient;
401
recipient = result->recipients;
402
while(recipient != NULL){
647
403
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);
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
650
407
fprintf_plus(stderr, "Secret key available: %s\n",
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
410
recipient = recipient->next;
652
411
}
653
412
}
654
413
}
710
469
return plaintext_length;
711
470
}
712
471
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){
472
static const char * safer_gnutls_strerror(int value){
722
473
const char *ret = gnutls_strerror(value);
723
return safe_string(ret);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
724
477
}
725
478
726
479
/* GnuTLS log function callback */
727
__attribute__((nonnull))
728
480
static void debuggnutls(__attribute__((unused)) int level,
729
481
const char* string){
730
482
fprintf_plus(stderr, "GnuTLS: %s", string);
731
483
}
732
484
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
734
485
static int init_gnutls_global(const char *pubkeyfilename,
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
mandos_context *mc){
486
const char *seckeyfilename){
738
487
int ret;
739
488
740
489
if(debug){
741
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
742
491
}
743
492
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
497
return -1;
498
}
499
744
500
if(debug){
745
501
/* "Use a log level over 10 to enable all debugging options."
746
502
* - GnuTLS manual
750
506
}
751
507
752
508
/* OpenPGP credentials */
753
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
754
510
if(ret != GNUTLS_E_SUCCESS){
755
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
512
safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
757
514
return -1;
758
515
}
759
516
760
517
if(debug){
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
763
520
pubkeyfilename,
764
521
seckeyfilename);
765
522
}
766
523
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
524
ret = gnutls_certificate_set_openpgp_key_file
781
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
782
526
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
786
527
if(ret != GNUTLS_E_SUCCESS){
787
528
fprintf_plus(stderr,
788
"Error[%d] while reading the key pair ('%s',"
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
789
530
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
531
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
532
safer_gnutls_strerror(ret));
793
534
}
794
535
795
536
/* GnuTLS server initialization */
796
ret = gnutls_dh_params_init(&mc->dh_params);
537
ret = gnutls_dh_params_init(&mc.dh_params);
797
538
if(ret != GNUTLS_E_SUCCESS){
798
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
799
540
" initialization: %s\n",
800
541
safer_gnutls_strerror(ret));
801
542
goto globalfail;
802
543
}
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
}
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
548
goto globalfail;
549
}
550
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
985
552
986
553
return 0;
987
554
988
555
globalfail:
989
556
990
gnutls_certificate_free_credentials(mc->cred);
991
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
992
560
return -1;
993
561
}
994
562
995
__attribute__((nonnull, warn_unused_result))
996
static int init_gnutls_session(gnutls_session_t *session,
997
mandos_context *mc){
563
static int init_gnutls_session(gnutls_session_t *session){
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
}
1019
578
{
1020
579
const char *err;
1021
580
do {
1022
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
1023
582
if(quit_now){
1024
583
gnutls_deinit(*session);
1025
584
return -1;
1036
595
1037
596
do {
1038
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1039
mc->cred);
598
mc.cred);
1040
599
if(quit_now){
1041
600
gnutls_deinit(*session);
1042
601
return -1;
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
int af, mandos_context *mc){
626
int af){
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
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1275
/* Check if the interface is one of the interfaces we are using */
1276
bool match = false;
1277
{
1278
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1281
interface))){
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
1283
match = true;
1284
break;
1285
}
1286
}
1287
}
1288
if(not match){
1289
/* This interface does not match any in the list, so we don't
1290
connect to the server */
1291
if(debug){
1292
char interface[IF_NAMESIZE];
1293
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1294
perror_plus("if_indextoname");
1295
} else {
1296
fprintf_plus(stderr, "Skipping server on non-used interface"
1297
" \"%s\"\n",
1298
if_indextoname((unsigned int)if_index,
1299
interface));
1300
}
1301
}
1302
return -1;
1303
}
1304
}
1305
1306
ret = init_gnutls_session(&session, mc);
662
ret = init_gnutls_session(&session);
1307
663
if(ret != 0){
1308
664
return -1;
1309
665
}
1313
669
PRIuMAX "\n", ip, (uintmax_t)port);
1314
670
}
1315
671
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1317
673
if(tcp_sd < 0){
1318
674
int e = errno;
1319
675
perror_plus("socket");
1326
682
goto mandos_end;
1327
683
}
1328
684
685
memset(&to, 0, sizeof(to));
1329
686
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);
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1333
689
} 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);
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
1337
692
}
1338
693
if(ret < 0 ){
1339
694
int e = errno;
1348
703
goto mandos_end;
1349
704
}
1350
705
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)){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1354
710
if(if_index == AVAHI_IF_UNSPEC){
1355
711
fprintf_plus(stderr, "An IPv6 link-local address is"
1356
712
" incomplete without a network interface\n");
1358
714
goto mandos_end;
1359
715
}
1360
716
/* Set the network interface number as scope */
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1362
718
}
1363
719
} else {
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1365
723
}
1366
724
1367
725
if(quit_now){
1384
742
}
1385
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1386
744
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;
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
1467
784
}
1468
785
1469
786
const char *out = mandos_protocol_version;
1620
937
if(buffer_length > 0){
1621
938
ssize_t decrypted_buffer_size;
1622
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1623
&decrypted_buffer, mc);
940
&decrypted_buffer);
1624
941
if(decrypted_buffer_size >= 0){
1625
942
1626
clearerr(stdout);
1627
943
written = 0;
1628
944
while(written < (size_t) decrypted_buffer_size){
1629
945
if(quit_now){
1645
961
}
1646
962
written += (size_t)ret;
1647
963
}
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
964
retval = 0;
1659
965
}
1660
966
}
1663
969
1664
970
mandos_end:
1665
971
{
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
972
int e = errno;
1673
973
free(decrypted_buffer);
1674
974
free(buffer);
1675
975
if(tcp_sd >= 0){
1676
ret = close(tcp_sd);
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1677
977
}
1678
978
if(ret == -1){
1679
979
if(e == 0){
1704
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1705
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1706
1006
flags,
1707
void *mc){
1007
AVAHI_GCC_UNUSED void* userdata){
1708
1008
if(r == NULL){
1709
1009
return;
1710
1010
}
1713
1013
timed out */
1714
1014
1715
1015
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1717
1016
return;
1718
1017
}
1719
1018
1723
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1724
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1725
1024
domain,
1726
avahi_strerror(avahi_server_errno
1727
(((mandos_context*)mc)->server)));
1025
avahi_strerror(avahi_server_errno(mc.server)));
1728
1026
break;
1729
1027
1730
1028
case AVAHI_RESOLVER_FOUND:
1738
1036
}
1739
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1740
1038
interface,
1741
avahi_proto_to_af(proto),
1742
mc);
1039
avahi_proto_to_af(proto));
1743
1040
if(ret == 0){
1744
avahi_simple_poll_quit(simple_poll);
1041
avahi_simple_poll_quit(mc.simple_poll);
1745
1042
} else {
1746
1043
if(not add_server(ip, (in_port_t)port, interface,
1747
avahi_proto_to_af(proto),
1748
&((mandos_context*)mc)->current_server)){
1044
avahi_proto_to_af(proto))){
1749
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1750
1046
" list\n", name);
1751
1047
}
1764
1060
const char *domain,
1765
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1766
1062
flags,
1767
void *mc){
1063
AVAHI_GCC_UNUSED void* userdata){
1768
1064
if(b == NULL){
1769
1065
return;
1770
1066
}
1781
1077
case AVAHI_BROWSER_FAILURE:
1782
1078
1783
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1784
avahi_strerror(avahi_server_errno
1785
(((mandos_context*)mc)->server)));
1786
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1787
1082
return;
1788
1083
1789
1084
case AVAHI_BROWSER_NEW:
1792
1087
the callback function is called the Avahi server will free the
1793
1088
resolver for us. */
1794
1089
1795
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1796
interface, protocol, name, type,
1797
domain, protocol, 0,
1798
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1799
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1800
1094
" %s\n", name,
1801
avahi_strerror(avahi_server_errno
1802
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1803
1096
break;
1804
1097
1805
1098
case AVAHI_BROWSER_REMOVE:
1824
1117
signal_received = sig;
1825
1118
int old_errno = errno;
1826
1119
/* set main loop to exit */
1827
if(simple_poll != NULL){
1828
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1829
1122
}
1830
1123
errno = old_errno;
1831
1124
}
1832
1125
1833
__attribute__((nonnull, warn_unused_result))
1834
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1835
1127
int ret;
1836
int old_errno;
1128
error_t ret_errno;
1837
1129
1838
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1839
1131
if(s < 0){
1840
old_errno = errno;
1132
ret_errno = errno;
1841
1133
perror_plus("socket");
1842
errno = old_errno;
1134
errno = ret_errno;
1843
1135
return false;
1844
1136
}
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1137
strcpy(ifr->ifr_name, ifname);
1847
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1848
1139
if(ret == -1){
1849
1140
if(debug){
1850
old_errno = errno;
1141
ret_errno = errno;
1851
1142
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;
1143
errno = ret_errno;
1858
1144
}
1859
1145
return false;
1860
1146
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1866
1147
return true;
1867
1148
}
1868
1149
1869
__attribute__((nonnull, warn_unused_result))
1870
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1871
1151
1872
1152
/* Reject the loopback device */
1914
1194
* corresponds to an acceptable network device.
1915
1195
* (This function is passed to scandir(3) as a filter function.)
1916
1196
*/
1917
__attribute__((nonnull, warn_unused_result))
1918
1197
int good_interface(const struct dirent *if_entry){
1919
1198
if(if_entry->d_name[0] == '.'){
1920
1199
return 0;
1938
1217
/*
1939
1218
* This function determines if a network interface is up.
1940
1219
*/
1941
__attribute__((nonnull, warn_unused_result))
1942
1220
bool interface_is_up(const char *interface){
1943
1221
struct ifreq ifr;
1944
1222
if(not get_flags(interface, &ifr)){
1955
1233
/*
1956
1234
* This function determines if a network interface is running
1957
1235
*/
1958
__attribute__((nonnull, warn_unused_result))
1959
1236
bool interface_is_running(const char *interface){
1960
1237
struct ifreq ifr;
1961
1238
if(not get_flags(interface, &ifr)){
1969
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1970
1247
}
1971
1248
1972
__attribute__((nonnull, pure, warn_unused_result))
1973
1249
int notdotentries(const struct dirent *direntry){
1974
1250
/* Skip "." and ".." */
1975
1251
if(direntry->d_name[0] == '.'
1982
1258
}
1983
1259
1984
1260
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1986
1261
int runnable_hook(const struct dirent *direntry){
1987
1262
int ret;
1988
1263
size_t sret;
1996
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1997
1272
"abcdefghijklmnopqrstuvwxyz"
1998
1273
"0123456789"
1999
"_.-");
1274
"_-");
2000
1275
if((direntry->d_name)[sret] != '\0'){
2001
1276
/* Contains non-allowed characters */
2002
1277
if(debug){
2006
1281
return 0;
2007
1282
}
2008
1283
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
2010
1292
if(ret == -1){
2011
1293
if(debug){
2012
1294
perror_plus("Could not stat hook");
2036
1318
return 1;
2037
1319
}
2038
1320
2039
__attribute__((nonnull, warn_unused_result))
2040
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2041
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2042
1322
int ret;
2043
1323
struct timespec now;
2044
1324
struct timespec waited_time;
2045
1325
intmax_t block_time;
2046
1326
2047
1327
while(true){
2048
if(mc->current_server == NULL){
2049
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
2050
1330
fprintf_plus(stderr, "Wait until first server is found."
2051
1331
" No timeout!\n");
2052
1332
}
2053
1333
ret = avahi_simple_poll_iterate(s, -1);
2054
1334
} else {
2055
if(debug){
1335
if (debug){
2056
1336
fprintf_plus(stderr, "Check current_server if we should run"
2057
1337
" it, or wait\n");
2058
1338
}
2065
1345
/* Calculating in ms how long time between now and server
2066
1346
who we visted longest time ago. Now - last seen. */
2067
1347
waited_time.tv_sec = (now.tv_sec
2068
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
2069
1349
waited_time.tv_nsec = (now.tv_nsec
2070
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
2071
1351
/* total time is 10s/10,000ms.
2072
1352
Converting to s from ms by dividing by 1,000,
2073
1353
and ns to ms by dividing by 1,000,000. */
2075
1355
- ((intmax_t)waited_time.tv_sec * 1000))
2076
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
2077
1357
2078
if(debug){
1358
if (debug){
2079
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2080
1360
block_time);
2081
1361
}
2082
1362
2083
1363
if(block_time <= 0){
2084
ret = start_mandos_communication(mc->current_server->ip,
2085
mc->current_server->port,
2086
mc->current_server->if_index,
2087
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
2088
1368
if(ret == 0){
2089
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
2090
1370
return 0;
2091
1371
}
2092
1372
ret = clock_gettime(CLOCK_MONOTONIC,
2093
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
2094
1374
if(ret == -1){
2095
1375
perror_plus("clock_gettime");
2096
1376
return -1;
2097
1377
}
2098
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
2099
1379
block_time = 0; /* Call avahi to find new Mandos
2100
1380
servers, but don't block */
2101
1381
}
2103
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
2104
1384
}
2105
1385
if(ret != 0){
2106
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
2107
1387
return (ret != 1) ? ret : 0;
2108
1388
}
2109
1389
}
2110
1390
}
2111
1391
}
2112
1392
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
2115
1446
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);
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
2139
1452
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);
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
2151
1460
}
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){
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
2198
1468
perror_plus("asprintf");
2199
_exit(EX_OSERR);
2200
}
2201
ret = setenv("DELAY", delaystring, 1);
2202
if(ret == -1){
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
2203
1527
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;
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
2272
1539
} 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);
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
2292
1576
}
2293
1577
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;
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
2299
1584
struct ifreq network;
2300
1585
unsigned int if_index = if_nametoindex(interface);
2301
1586
if(if_index == 0){
2310
1595
}
2311
1596
2312
1597
if(not interface_is_up(interface)){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network)){
1598
if(not get_flags(interface, &network) and debug){
2316
1599
ret_errno = errno;
2317
1600
fprintf_plus(stderr, "Failed to get flags for interface "
2318
1601
"\"%s\"\n", interface);
2319
errno = old_errno;
2320
1602
return ret_errno;
2321
1603
}
2322
network.ifr_flags |= IFF_UP; /* set flag */
1604
network.ifr_flags |= IFF_UP;
2323
1605
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2326
1608
ret_errno = errno;
2327
1609
perror_plus("socket");
2328
1610
errno = old_errno;
2329
1611
return ret_errno;
2330
1612
}
2331
1613
2332
1614
if(quit_now){
2333
ret = close(sd);
2334
if(ret == -1){
2335
perror_plus("close");
2336
}
1615
close(sd);
2337
1616
errno = old_errno;
2338
1617
return EINTR;
2339
1618
}
2343
1622
interface);
2344
1623
}
2345
1624
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
}
1625
/* Raise priviliges */
1626
raise_privileges();
2352
1627
2353
1628
#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
}
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
2365
1636
}
2366
1637
#endif /* __linux__ */
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2369
1640
#ifdef __linux__
2370
1641
if(restore_loglevel){
2371
1642
ret_linux = klogctl(7, NULL, 0);
2375
1646
}
2376
1647
#endif /* __linux__ */
2377
1648
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
}
1649
/* Lower privileges */
1650
lower_privileges();
2387
1651
2388
1652
/* Close the socket */
2389
ret = close(sd);
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2390
1654
if(ret == -1){
2391
1655
perror_plus("close");
2392
1656
}
2393
1657
2394
1658
if(ret_setflags == -1){
2395
errno = ioctl_errno;
1659
errno = ret_errno;
2396
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2397
1661
errno = old_errno;
2398
return ioctl_errno;
1662
return ret_errno;
2399
1663
}
2400
1664
} else if(debug){
2401
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2404
1668
2405
1669
/* Sleep checking until interface is running.
2406
1670
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
1671
for(int i=0; i < delay * 4; i++){
2408
1672
if(interface_is_running(interface)){
2409
1673
break;
2410
1674
}
2419
1683
return 0;
2420
1684
}
2421
1685
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
2425
1691
struct ifreq network;
2426
1692
unsigned int if_index = if_nametoindex(interface);
2427
1693
if(if_index == 0){
2430
1696
return ENXIO;
2431
1697
}
2432
1698
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
2435
1699
if(not get_flags(interface, &network) and debug){
2436
1700
ret_errno = errno;
2437
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2438
1702
"\"%s\"\n", interface);
2439
errno = old_errno;
2440
1703
return ret_errno;
2441
1704
}
2442
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2443
1706
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2445
if(sd == -1){
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2446
1709
ret_errno = errno;
2447
1710
perror_plus("socket");
2448
1711
errno = old_errno;
2454
1717
interface);
2455
1718
}
2456
1719
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
}
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
2476
1728
2477
1729
/* Close the socket */
2478
int ret = close(sd);
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2479
1731
if(ret == -1){
2480
1732
perror_plus("close");
2481
1733
}
2482
1734
2483
1735
if(ret_setflags == -1){
2484
errno = ioctl_errno;
1736
errno = ret_errno;
2485
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2486
1738
errno = old_errno;
2487
return ioctl_errno;
1739
return ret_errno;
2488
1740
}
2489
1741
} else if(debug){
2490
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2496
1748
}
2497
1749
2498
1750
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 };
2512
1751
AvahiSServiceBrowser *sb = NULL;
2513
1752
error_t ret_errno;
2514
1753
int ret;
2515
1754
intmax_t tmpmax;
2516
1755
char *tmp;
2517
1756
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
2518
1759
char *interfaces_to_take_down = NULL;
2519
1760
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;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2523
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
1764
const char *seckey = PATHDIR "/" SECKEY;
2525
1765
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
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
2532
1768
2533
1769
bool gnutls_initialized = false;
2534
1770
bool gpgme_initialized = false;
2580
1816
{ .name = "pubkey", .key = 'p',
2581
1817
.arg = "FILE",
2582
1818
.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 },
1819
.group = 2 },
2600
1820
{ .name = "dh-bits", .key = 129,
2601
1821
.arg = "BITS",
2602
1822
.doc = "Bit length of the prime number used in the"
2603
1823
" Diffie-Hellman key exchange",
2604
1824
.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
1825
{ .name = "priority", .key = 130,
2611
1826
.arg = "STRING",
2612
1827
.doc = "GnuTLS priority string for the TLS handshake",
2646
1861
connect_to = arg;
2647
1862
break;
2648
1863
case 'i': /* --interface */
2649
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2650
arg, (int)',');
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2651
1866
if(ret_errno != 0){
2652
1867
argp_error(state, "%s", strerror(ret_errno));
2653
1868
}
2658
1873
case 'p': /* --pubkey */
2659
1874
pubkey = arg;
2660
1875
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
1876
case 129: /* --dh-bits */
2672
1877
errno = 0;
2673
1878
tmpmax = strtoimax(arg, &tmp, 10);
2677
1882
}
2678
1883
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2679
1884
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
2683
1885
case 130: /* --priority */
2684
1886
mc.priority = arg;
2685
1887
break;
2708
1910
argp_state_help(state, state->out_stream,
2709
1911
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
1912
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
1913
case -3: /* --usage */
2713
1914
argp_state_help(state, state->out_stream,
2714
1915
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
1916
case 'V': /* --version */
2717
1917
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
1918
exit(argp_err_exit_status);
2727
1927
.args_doc = "",
2728
1928
.doc = "Mandos client -- Get and decrypt"
2729
1929
" 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){
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
2733
1933
case 0:
2734
1934
break;
2735
1935
case ENOMEM:
2736
1936
default:
2737
errno = ret_errno;
1937
errno = ret;
2738
1938
perror_plus("argp_parse");
2739
1939
exitcode = EX_OSERR;
2740
1940
goto end;
2743
1943
goto end;
2744
1944
}
2745
1945
}
2746
1946
2747
1947
{
2748
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2752
perror_plus("Failed to raise privileges");
2753
} else {
1948
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
1950
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2754
1953
struct stat st;
2755
1954
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
2759
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
1956
int seckey_fd = open(seckey, O_RDONLY);
2761
1957
if(seckey_fd == -1){
2773
1969
}
2774
1970
}
2775
1971
}
2776
close(seckey_fd);
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2777
1973
}
2778
1974
}
2779
1975
2780
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2781
1977
int pubkey_fd = open(pubkey, O_RDONLY);
2782
1978
if(pubkey_fd == -1){
2794
1990
}
2795
1991
}
2796
1992
}
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
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
2832
1997
/* Lower privileges */
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2836
perror_plus("Failed to lower privileges");
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2837
2002
}
2838
2003
}
2839
2004
}
2840
2005
2841
/* Remove invalid interface names (except "none") */
2006
/* Remove empty interface names */
2842
2007
{
2843
2008
char *interface = NULL;
2844
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2009
while((interface = argz_next(interfaces, interfaces_size,
2845
2010
interface))){
2846
if(strcmp(interface, "none") != 0
2847
and if_nametoindex(interface) == 0){
2848
if(interface[0] != '\0'){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2849
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2850
2014
" \"%s\"\n", interface);
2851
2015
}
2852
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2016
argz_delete(&interfaces, &interfaces_size, interface);
2853
2017
interface = NULL;
2854
2018
}
2855
2019
}
2857
2021
2858
2022
/* Run network hooks */
2859
2023
{
2860
if(mc.interfaces != NULL){
2861
interfaces_hooks = malloc(mc.interfaces_size);
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2862
2027
if(interfaces_hooks == NULL){
2863
2028
perror_plus("malloc");
2864
2029
goto end;
2865
2030
}
2866
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);
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2871
2040
}
2872
2041
2873
2042
if(not debug){
2878
2047
from the signal handler */
2879
2048
/* Initialize the pseudo-RNG for Avahi */
2880
2049
srand((unsigned int) time(NULL));
2881
simple_poll = avahi_simple_poll_new();
2882
if(simple_poll == NULL){
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2883
2052
fprintf_plus(stderr,
2884
2053
"Avahi: Failed to create simple poll object.\n");
2885
2054
exitcode = EX_UNAVAILABLE;
2950
2119
}
2951
2120
2952
2121
/* If no interfaces were specified, make a list */
2953
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2955
2124
/* Look for any good interfaces */
2956
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2957
2126
alphasort);
2958
2127
if(ret >= 1){
2959
2128
/* Add all found interfaces to interfaces list */
2960
2129
for(int i = 0; i < ret; ++i){
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2962
2131
direntries[i]->d_name);
2963
2132
if(ret_errno != 0){
2964
errno = ret_errno;
2965
2133
perror_plus("argz_add");
2966
free(direntries[i]);
2967
2134
continue;
2968
2135
}
2969
2136
if(debug){
2970
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2971
2138
direntries[i]->d_name);
2972
2139
}
2973
free(direntries[i]);
2974
2140
}
2975
2141
free(direntries);
2976
2142
} else {
2977
if(ret == 0){
2978
free(direntries);
2979
}
2143
free(direntries);
2980
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2981
2145
exitcode = EXIT_FAILURE;
2982
2146
goto end;
2983
2147
}
2984
2148
}
2985
2149
2986
/* Bring up interfaces which are down, and remove any "none"s */
2987
{
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2988
2162
char *interface = NULL;
2989
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
while((interface = argz_next(interfaces, interfaces_size,
2990
2164
interface))){
2991
/* If interface name is "none", stop bringing up interfaces.
2992
Also remove all instances of "none" from the list */
2993
if(strcmp(interface, "none") == 0){
2994
argz_delete(&mc.interfaces, &mc.interfaces_size,
2995
interface);
2996
interface = NULL;
2997
while((interface = argz_next(mc.interfaces,
2998
mc.interfaces_size, interface))){
2999
if(strcmp(interface, "none") == 0){
3000
argz_delete(&mc.interfaces, &mc.interfaces_size,
3001
interface);
3002
interface = NULL;
3003
}
3004
}
3005
break;
3006
}
3007
2165
bool interface_was_up = interface_is_up(interface);
3008
errno = bring_up_interface(interface, delay);
2166
ret = bring_up_interface(interface, delay);
3009
2167
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));
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
3013
2171
} 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
}
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
3020
2175
}
3021
2176
}
3022
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
3023
2181
if(debug and (interfaces_to_take_down == NULL)){
3024
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
3025
2183
}
3026
2184
}
3027
2185
3028
/* If we only got one interface, explicitly use only that one */
3029
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
3030
if(debug){
3031
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3032
mc.interfaces);
3033
}
3034
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3035
}
3036
3037
2186
if(quit_now){
3038
2187
goto end;
3039
2188
}
3040
2189
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
2190
ret = init_gnutls_global(pubkey, seckey);
3048
2191
if(ret == -1){
3049
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
2193
exitcode = EX_UNAVAILABLE;
3057
2200
goto end;
3058
2201
}
3059
2202
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){
2203
if(mkdtemp(tempdir) == NULL){
3070
2204
perror_plus("mkdtemp");
3071
2205
goto end;
3072
2206
}
2207
tempdir_created = true;
3073
2208
3074
2209
if(quit_now){
3075
2210
goto end;
3076
2211
}
3077
2212
3078
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
3079
2214
fprintf_plus(stderr, "init_gpgme failed\n");
3080
2215
exitcode = EX_UNAVAILABLE;
3081
2216
goto end;
3111
2246
exitcode = EX_USAGE;
3112
2247
goto end;
3113
2248
}
3114
2249
3115
2250
if(quit_now){
3116
2251
goto end;
3117
2252
}
3138
2273
}
3139
2274
3140
2275
while(not quit_now){
3141
ret = start_mandos_communication(address, port, if_index, af,
3142
&mc);
2276
ret = start_mandos_communication(address, port, if_index, af);
3143
2277
if(quit_now or ret == 0){
3144
2278
break;
3145
2279
}
3147
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
3148
2282
(int)retry_interval);
3149
2283
}
3150
sleep((unsigned int)retry_interval);
2284
sleep((int)retry_interval);
3151
2285
}
3152
2286
3153
if(not quit_now){
2287
if (not quit_now){
3154
2288
exitcode = EXIT_SUCCESS;
3155
2289
}
3156
2290
3171
2305
config.publish_domain = 0;
3172
2306
3173
2307
/* Allocate a new server */
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
3176
2311
3177
2312
/* Free the Avahi configuration data */
3178
2313
avahi_server_config_free(&config);
3181
2316
/* Check if creating the Avahi server object succeeded */
3182
2317
if(mc.server == NULL){
3183
2318
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
2319
avahi_strerror(ret_errno));
3185
2320
exitcode = EX_UNAVAILABLE;
3186
2321
goto end;
3187
2322
}
3193
2328
/* Create the Avahi service browser */
3194
2329
sb = avahi_s_service_browser_new(mc.server, if_index,
3195
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3196
NULL, 0, browse_callback,
3197
(void *)&mc);
2331
NULL, 0, browse_callback, NULL);
3198
2332
if(sb == NULL){
3199
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3200
2334
avahi_strerror(avahi_server_errno(mc.server)));
3211
2345
if(debug){
3212
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
3213
2347
}
3214
3215
ret = avahi_loop_with_timeout(simple_poll,
3216
(int)(retry_interval * 1000), &mc);
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
3217
2351
if(debug){
3218
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3219
2353
(ret == 0) ? "successfully" : "with error");
3222
2356
end:
3223
2357
3224
2358
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
}
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3232
2360
}
3233
2361
3234
2362
/* Cleanup things */
3235
free(mc.interfaces);
3236
3237
2363
if(sb != NULL)
3238
2364
avahi_s_service_browser_free(sb);
3239
2365
3240
2366
if(mc.server != NULL)
3241
2367
avahi_server_free(mc.server);
3242
2368
3243
if(simple_poll != NULL)
3244
avahi_simple_poll_free(simple_poll);
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
3245
2371
3246
2372
if(gnutls_initialized){
3247
2373
gnutls_certificate_free_credentials(mc.cred);
2374
gnutls_global_deinit();
3248
2375
gnutls_dh_params_deinit(mc.dh_params);
3249
2376
}
3250
2377
3258
2385
mc.current_server->prev->next = NULL;
3259
2386
while(mc.current_server != NULL){
3260
2387
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
2388
free(mc.current_server);
3270
2389
mc.current_server = next;
3271
2390
}
3272
2391
}
3273
2392
3274
/* Re-raise privileges */
2393
/* Re-raise priviliges */
3275
2394
{
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
}
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
3310
2420
}
3311
2421
3312
2422
free(interfaces_to_take_down);
3313
2423
free(interfaces_hooks);
3314
2424
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
2425
/* Removes the GPGME temp directory and all files inside */
2426
if(tempdir_created){
3317
2427
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){
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
3331
2432
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);
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
direntry->d_name);
2437
if(ret < 0){
2438
perror_plus("asprintf");
2439
continue;
2440
}
2441
ret = remove(fullname);
2442
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2445
}
2446
free(fullname);
2447
}
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
2454
}
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
2458
}
3372
2459
}
3373
2460
3374
2461
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0