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» Revision
237.7.824
(compared to revision 237.7.148)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2024-09-07 23:55:04 UTC
- mto: This revision was merged to the branch mainline in revision 410.
- Revision ID: teddy@recompile.se-20240907235504-1vbgry3s18ch1ux4
Improve formatting in mandos-ctl; no code changes
* mandos-ctl: Add empty lines, break long lines, remove superflous
empty lines, spaces and dead code.
* mandos-ctl: Add empty lines, break long lines, remove superflous
empty lines, spaces and dead code.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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 © 2008-2012 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
12
* Copyright © 2008-2022 Teddy Hogeborn
13
* Copyright © 2008-2022 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
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() */
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
48
44
#include <stdbool.h> /* bool, false, true */
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,
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 */
111
#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,
63
129
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() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
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 */
94
138
95
139
#ifdef __linux__
96
140
#include <sys/klog.h> /* klogctl() */
109
153
110
154
/* GnuTLS */
111
155
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
112
functions:
113
gnutls_*
114
init_gnutls_session(),
115
GNUTLS_* */
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
116
158
#include <gnutls/openpgp.h>
117
159
/* gnutls_certificate_set_openpgp_key_file(),
118
160
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
119
165
120
166
/* GPGME */
121
167
#include <gpgme.h> /* All GPGME types, constants and
122
168
functions:
123
gpgme_*
124
GPGME_PROTOCOL_OpenPGP,
125
GPG_ERR_NO_* */
169
gpgme_*, GPG_ERR_NO_*,
170
GPGME_IMPORT_*
171
GPGME_PROTOCOL_OpenPGP */
126
172
127
173
#define BUFFER_SIZE 256
128
174
129
175
#define PATHDIR "/conf/conf.d/mandos"
130
176
#define SECKEY "seckey.txt"
131
177
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
132
180
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
181
134
182
bool debug = false;
138
186
static const char sys_class_net[] = "/sys/class/net";
139
187
char *connect_to = NULL;
140
188
const char *hookdir = HOOKDIR;
189
int hookdir_fd = -1;
141
190
uid_t uid = 65534;
142
191
gid_t gid = 65534;
143
192
154
203
155
204
/* Used for passing in values through the Avahi callback functions */
156
205
typedef struct {
157
AvahiSimplePoll *simple_poll;
158
206
AvahiServer *server;
159
207
gnutls_certificate_credentials_t cred;
160
208
unsigned int dh_bits;
162
210
const char *priority;
163
211
gpgme_ctx_t ctx;
164
212
server *current_server;
213
char *interfaces;
214
size_t interfaces_size;
165
215
} mandos_context;
166
216
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 };
217
/* global so signal handler can reach it*/
218
AvahiSimplePoll *simple_poll;
172
219
173
220
sig_atomic_t quit_now = 0;
174
221
int signal_received = 0;
182
229
perror(print_text);
183
230
}
184
231
185
__attribute__((format (gnu_printf, 2, 3)))
232
__attribute__((format (gnu_printf, 2, 3), nonnull))
186
233
int fprintf_plus(FILE *stream, const char *format, ...){
187
234
va_list ap;
188
235
va_start (ap, format);
189
236
190
237
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
191
238
program_invocation_short_name));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
239
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
240
}
194
241
195
242
/*
197
244
* bytes. "buffer_capacity" is how much is currently allocated,
198
245
* "buffer_length" is how much is already used.
199
246
*/
247
__attribute__((nonnull, warn_unused_result))
200
248
size_t incbuffer(char **buffer, size_t buffer_length,
201
249
size_t buffer_capacity){
202
250
if(buffer_length + BUFFER_SIZE > buffer_capacity){
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
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;
205
257
return 0;
206
258
}
259
*buffer = new_buf;
207
260
buffer_capacity += BUFFER_SIZE;
208
261
}
209
262
return buffer_capacity;
210
263
}
211
264
212
265
/* Add server to set of servers to retry periodically */
266
__attribute__((nonnull, warn_unused_result))
213
267
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
214
int af){
268
int af, server **current_server){
215
269
int ret;
216
270
server *new_server = malloc(sizeof(server));
217
271
if(new_server == NULL){
224
278
.af = af };
225
279
if(new_server->ip == NULL){
226
280
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);
227
296
return false;
228
297
}
229
298
/* Special case of first server */
230
if (mc.current_server == NULL){
299
if(*current_server == NULL){
231
300
new_server->next = new_server;
232
301
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
302
*current_server = new_server;
235
303
} else {
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
304
/* Place the new server last in the list */
305
new_server->next = *current_server;
306
new_server->prev = (*current_server)->prev;
238
307
new_server->prev->next = 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;
308
(*current_server)->prev = new_server;
245
309
}
246
310
return true;
247
311
}
248
312
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
249
365
/*
250
366
* Initialize GPGME.
251
367
*/
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
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){
254
373
gpgme_error_t rc;
255
374
gpgme_engine_info_t engine_info;
256
375
257
258
376
/*
259
377
* Helper function to insert pub and seckey to the engine keyring.
260
378
*/
261
bool import_key(const char *filename){
379
bool import_key(const char * const filename){
262
380
int ret;
263
381
int fd;
264
382
gpgme_data_t pgp_data;
269
387
return false;
270
388
}
271
389
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
272
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
273
440
if(rc != GPG_ERR_NO_ERROR){
274
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
443
return false;
277
444
}
278
445
279
rc = gpgme_op_import(mc.ctx, pgp_data);
446
rc = gpgme_op_import(mc->ctx, pgp_data);
280
447
if(rc != GPG_ERR_NO_ERROR){
281
448
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
449
gpgme_strsource(rc), gpgme_strerror(rc));
283
450
return false;
284
451
}
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
}
285
527
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
528
ret = close(fd);
287
529
if(ret == -1){
288
530
perror_plus("close");
289
531
}
326
568
}
327
569
328
570
/* Create new GPGME "context" */
329
rc = gpgme_new(&(mc.ctx));
571
rc = gpgme_new(&(mc->ctx));
330
572
if(rc != GPG_ERR_NO_ERROR){
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
333
gpgme_strerror(rc));
573
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
574
gpgme_strsource(rc), gpgme_strerror(rc));
334
575
return false;
335
576
}
336
577
345
586
* Decrypt OpenPGP data.
346
587
* Returns -1 on error
347
588
*/
589
__attribute__((nonnull, warn_unused_result))
348
590
static ssize_t pgp_packet_decrypt(const char *cryptotext,
349
591
size_t crypto_size,
350
char **plaintext){
592
char **plaintext,
593
mandos_context *mc){
351
594
gpgme_data_t dh_crypto, dh_plain;
352
595
gpgme_error_t rc;
353
596
ssize_t ret;
370
613
/* Create new empty GPGME data buffer for the plaintext */
371
614
rc = gpgme_data_new(&dh_plain);
372
615
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_data_new: %s: %s\n",
616
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
375
617
gpgme_strsource(rc), gpgme_strerror(rc));
376
618
gpgme_data_release(dh_crypto);
377
619
return -1;
379
621
380
622
/* Decrypt data from the cryptotext data buffer to the plaintext
381
623
data buffer */
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
624
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
383
625
if(rc != GPG_ERR_NO_ERROR){
384
626
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
627
gpgme_strsource(rc), gpgme_strerror(rc));
386
628
plaintext_length = -1;
387
629
if(debug){
388
630
gpgme_decrypt_result_t result;
389
result = gpgme_op_decrypt_result(mc.ctx);
631
result = gpgme_op_decrypt_result(mc->ctx);
390
632
if(result == NULL){
391
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
392
634
} else {
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);
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");
397
641
if(result->file_name != NULL){
398
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
399
643
}
400
gpgme_recipient_t recipient;
401
recipient = result->recipients;
402
while(recipient != NULL){
644
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
646
r = r->next){
403
647
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
407
650
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
409
? "No" : "Yes");
410
recipient = recipient->next;
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
411
652
}
412
653
}
413
654
}
469
710
return plaintext_length;
470
711
}
471
712
472
static const char * safer_gnutls_strerror(int value){
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){
473
722
const char *ret = gnutls_strerror(value);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
723
return safe_string(ret);
477
724
}
478
725
479
726
/* GnuTLS log function callback */
727
__attribute__((nonnull))
480
728
static void debuggnutls(__attribute__((unused)) int level,
481
729
const char* string){
482
730
fprintf_plus(stderr, "GnuTLS: %s", string);
483
731
}
484
732
733
__attribute__((nonnull(1, 2, 4), warn_unused_result))
485
734
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
735
const char *seckeyfilename,
736
const char *dhparamsfilename,
737
mandos_context *mc){
487
738
int ret;
488
739
489
740
if(debug){
490
741
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
742
}
492
743
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
500
744
if(debug){
501
745
/* "Use a log level over 10 to enable all debugging options."
502
746
* - GnuTLS manual
506
750
}
507
751
508
752
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
753
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
754
if(ret != GNUTLS_E_SUCCESS){
511
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
512
756
safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
514
757
return -1;
515
758
}
516
759
517
760
if(debug){
518
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
519
" secret key %s as GnuTLS credentials\n",
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
520
763
pubkeyfilename,
521
764
seckeyfilename);
522
765
}
523
766
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
524
780
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
781
(mc->cred, pubkeyfilename, seckeyfilename,
526
782
GNUTLS_OPENPGP_FMT_BASE64);
783
#else
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
785
#endif
527
786
if(ret != GNUTLS_E_SUCCESS){
528
787
fprintf_plus(stderr,
529
"Error[%d] while reading the OpenPGP key pair ('%s',"
788
"Error[%d] while reading the key pair ('%s',"
530
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
531
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
532
791
safer_gnutls_strerror(ret));
534
793
}
535
794
536
795
/* GnuTLS server initialization */
537
ret = gnutls_dh_params_init(&mc.dh_params);
796
ret = gnutls_dh_params_init(&mc->dh_params);
538
797
if(ret != GNUTLS_E_SUCCESS){
539
798
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
799
" initialization: %s\n",
541
800
safer_gnutls_strerror(ret));
542
801
goto globalfail;
543
802
}
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);
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
}
552
985
553
986
return 0;
554
987
555
988
globalfail:
556
989
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
990
gnutls_certificate_free_credentials(mc->cred);
991
gnutls_dh_params_deinit(mc->dh_params);
560
992
return -1;
561
993
}
562
994
563
static int init_gnutls_session(gnutls_session_t *session){
995
__attribute__((nonnull, warn_unused_result))
996
static int init_gnutls_session(gnutls_session_t *session,
997
mandos_context *mc){
564
998
int ret;
565
999
/* GnuTLS session creation */
566
1000
do {
567
ret = gnutls_init(session, GNUTLS_SERVER);
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
));
568
1009
if(quit_now){
569
1010
return -1;
570
1011
}
578
1019
{
579
1020
const char *err;
580
1021
do {
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
1022
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
582
1023
if(quit_now){
583
1024
gnutls_deinit(*session);
584
1025
return -1;
595
1036
596
1037
do {
597
1038
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc.cred);
1039
mc->cred);
599
1040
if(quit_now){
600
1041
gnutls_deinit(*session);
601
1042
return -1;
611
1052
/* ignore client certificate if any. */
612
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
1054
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
616
1055
return 0;
617
1056
}
618
1057
620
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
1060
__attribute__((unused)) const char *txt){}
622
1061
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
623
1235
/* Called when a Mandos server is found */
1236
__attribute__((nonnull, warn_unused_result))
624
1237
static int start_mandos_communication(const char *ip, in_port_t port,
625
1238
AvahiIfIndex if_index,
626
int af){
1239
int af, mandos_context *mc){
627
1240
int ret, tcp_sd = -1;
628
1241
ssize_t sret;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1242
struct sockaddr_storage to;
633
1243
char *buffer = NULL;
634
1244
char *decrypted_buffer = NULL;
635
1245
size_t buffer_length = 0;
638
1248
int retval = -1;
639
1249
gnutls_session_t session;
640
1250
int pf; /* Protocol family */
1251
bool route_added = false;
641
1252
642
1253
errno = 0;
643
1254
659
1270
return -1;
660
1271
}
661
1272
662
ret = init_gnutls_session(&session);
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);
663
1307
if(ret != 0){
664
1308
return -1;
665
1309
}
669
1313
PRIuMAX "\n", ip, (uintmax_t)port);
670
1314
}
671
1315
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
673
1317
if(tcp_sd < 0){
674
1318
int e = errno;
675
1319
perror_plus("socket");
682
1326
goto mandos_end;
683
1327
}
684
1328
685
memset(&to, 0, sizeof(to));
686
1329
if(af == AF_INET6){
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
689
1333
} else { /* IPv4 */
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
692
1337
}
693
1338
if(ret < 0 ){
694
1339
int e = errno;
703
1348
goto mandos_end;
704
1349
}
705
1350
if(af == AF_INET6){
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*/
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
710
1354
if(if_index == AVAHI_IF_UNSPEC){
711
1355
fprintf_plus(stderr, "An IPv6 link-local address is"
712
1356
" incomplete without a network interface\n");
714
1358
goto mandos_end;
715
1359
}
716
1360
/* Set the network interface number as scope */
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
718
1362
}
719
1363
} else {
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
723
1365
}
724
1366
725
1367
if(quit_now){
742
1384
}
743
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
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;
784
1467
}
785
1468
786
1469
const char *out = mandos_protocol_version;
937
1620
if(buffer_length > 0){
938
1621
ssize_t decrypted_buffer_size;
939
1622
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
940
&decrypted_buffer);
1623
&decrypted_buffer, mc);
941
1624
if(decrypted_buffer_size >= 0){
942
1625
1626
clearerr(stdout);
943
1627
written = 0;
944
1628
while(written < (size_t) decrypted_buffer_size){
945
1629
if(quit_now){
961
1645
}
962
1646
written += (size_t)ret;
963
1647
}
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
}
964
1658
retval = 0;
965
1659
}
966
1660
}
969
1663
970
1664
mandos_end:
971
1665
{
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
}
972
1672
int e = errno;
973
1673
free(decrypted_buffer);
974
1674
free(buffer);
975
1675
if(tcp_sd >= 0){
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1676
ret = close(tcp_sd);
977
1677
}
978
1678
if(ret == -1){
979
1679
if(e == 0){
1004
1704
AVAHI_GCC_UNUSED AvahiStringList *txt,
1005
1705
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1006
1706
flags,
1007
AVAHI_GCC_UNUSED void* userdata){
1707
void *mc){
1008
1708
if(r == NULL){
1009
1709
return;
1010
1710
}
1013
1713
timed out */
1014
1714
1015
1715
if(quit_now){
1716
avahi_s_service_resolver_free(r);
1016
1717
return;
1017
1718
}
1018
1719
1022
1723
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
1724
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
1725
domain,
1025
avahi_strerror(avahi_server_errno(mc.server)));
1726
avahi_strerror(avahi_server_errno
1727
(((mandos_context*)mc)->server)));
1026
1728
break;
1027
1729
1028
1730
case AVAHI_RESOLVER_FOUND:
1036
1738
}
1037
1739
int ret = start_mandos_communication(ip, (in_port_t)port,
1038
1740
interface,
1039
avahi_proto_to_af(proto));
1741
avahi_proto_to_af(proto),
1742
mc);
1040
1743
if(ret == 0){
1041
avahi_simple_poll_quit(mc.simple_poll);
1744
avahi_simple_poll_quit(simple_poll);
1042
1745
} else {
1043
1746
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto))){
1747
avahi_proto_to_af(proto),
1748
&((mandos_context*)mc)->current_server)){
1045
1749
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1046
1750
" list\n", name);
1047
1751
}
1060
1764
const char *domain,
1061
1765
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
1766
flags,
1063
AVAHI_GCC_UNUSED void* userdata){
1767
void *mc){
1064
1768
if(b == NULL){
1065
1769
return;
1066
1770
}
1077
1781
case AVAHI_BROWSER_FAILURE:
1078
1782
1079
1783
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1784
avahi_strerror(avahi_server_errno
1785
(((mandos_context*)mc)->server)));
1786
avahi_simple_poll_quit(simple_poll);
1082
1787
return;
1083
1788
1084
1789
case AVAHI_BROWSER_NEW:
1087
1792
the callback function is called the Avahi server will free the
1088
1793
resolver for us. */
1089
1794
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
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)
1093
1799
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1800
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1801
avahi_strerror(avahi_server_errno
1802
(((mandos_context*)mc)->server)));
1096
1803
break;
1097
1804
1098
1805
case AVAHI_BROWSER_REMOVE:
1117
1824
signal_received = sig;
1118
1825
int old_errno = errno;
1119
1826
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1827
if(simple_poll != NULL){
1828
avahi_simple_poll_quit(simple_poll);
1122
1829
}
1123
1830
errno = old_errno;
1124
1831
}
1125
1832
1833
__attribute__((nonnull, warn_unused_result))
1126
1834
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1835
int ret;
1128
error_t ret_errno;
1836
int old_errno;
1129
1837
1130
1838
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
1839
if(s < 0){
1132
ret_errno = errno;
1840
old_errno = errno;
1133
1841
perror_plus("socket");
1134
errno = ret_errno;
1842
errno = old_errno;
1135
1843
return false;
1136
1844
}
1137
strcpy(ifr->ifr_name, ifname);
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1138
1847
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
1848
if(ret == -1){
1140
1849
if(debug){
1141
ret_errno = errno;
1850
old_errno = errno;
1142
1851
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1852
errno = old_errno;
1853
}
1854
if((close(s) == -1) and debug){
1855
old_errno = errno;
1856
perror_plus("close");
1857
errno = old_errno;
1144
1858
}
1145
1859
return false;
1146
1860
}
1861
if((close(s) == -1) and debug){
1862
old_errno = errno;
1863
perror_plus("close");
1864
errno = old_errno;
1865
}
1147
1866
return true;
1148
1867
}
1149
1868
1869
__attribute__((nonnull, warn_unused_result))
1150
1870
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1871
1152
1872
/* Reject the loopback device */
1194
1914
* corresponds to an acceptable network device.
1195
1915
* (This function is passed to scandir(3) as a filter function.)
1196
1916
*/
1917
__attribute__((nonnull, warn_unused_result))
1197
1918
int good_interface(const struct dirent *if_entry){
1198
1919
if(if_entry->d_name[0] == '.'){
1199
1920
return 0;
1217
1938
/*
1218
1939
* This function determines if a network interface is up.
1219
1940
*/
1941
__attribute__((nonnull, warn_unused_result))
1220
1942
bool interface_is_up(const char *interface){
1221
1943
struct ifreq ifr;
1222
1944
if(not get_flags(interface, &ifr)){
1233
1955
/*
1234
1956
* This function determines if a network interface is running
1235
1957
*/
1958
__attribute__((nonnull, warn_unused_result))
1236
1959
bool interface_is_running(const char *interface){
1237
1960
struct ifreq ifr;
1238
1961
if(not get_flags(interface, &ifr)){
1246
1969
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1970
}
1248
1971
1972
__attribute__((nonnull, pure, warn_unused_result))
1249
1973
int notdotentries(const struct dirent *direntry){
1250
1974
/* Skip "." and ".." */
1251
1975
if(direntry->d_name[0] == '.'
1258
1982
}
1259
1983
1260
1984
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1261
1986
int runnable_hook(const struct dirent *direntry){
1262
1987
int ret;
1263
1988
size_t sret;
1271
1996
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1997
"abcdefghijklmnopqrstuvwxyz"
1273
1998
"0123456789"
1274
"_-");
1999
"_.-");
1275
2000
if((direntry->d_name)[sret] != '\0'){
1276
2001
/* Contains non-allowed characters */
1277
2002
if(debug){
1281
2006
return 0;
1282
2007
}
1283
2008
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);
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
2010
if(ret == -1){
1293
2011
if(debug){
1294
2012
perror_plus("Could not stat hook");
1318
2036
return 1;
1319
2037
}
1320
2038
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
2039
__attribute__((nonnull, warn_unused_result))
2040
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2041
mandos_context *mc){
1322
2042
int ret;
1323
2043
struct timespec now;
1324
2044
struct timespec waited_time;
1325
2045
intmax_t block_time;
1326
2046
1327
2047
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
2048
if(mc->current_server == NULL){
2049
if(debug){
1330
2050
fprintf_plus(stderr, "Wait until first server is found."
1331
2051
" No timeout!\n");
1332
2052
}
1333
2053
ret = avahi_simple_poll_iterate(s, -1);
1334
2054
} else {
1335
if (debug){
2055
if(debug){
1336
2056
fprintf_plus(stderr, "Check current_server if we should run"
1337
2057
" it, or wait\n");
1338
2058
}
1345
2065
/* Calculating in ms how long time between now and server
1346
2066
who we visted longest time ago. Now - last seen. */
1347
2067
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
2068
- mc->current_server->last_seen.tv_sec);
1349
2069
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
2070
- mc->current_server->last_seen.tv_nsec);
1351
2071
/* total time is 10s/10,000ms.
1352
2072
Converting to s from ms by dividing by 1,000,
1353
2073
and ns to ms by dividing by 1,000,000. */
1355
2075
- ((intmax_t)waited_time.tv_sec * 1000))
1356
2076
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
2077
1358
if (debug){
2078
if(debug){
1359
2079
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
2080
block_time);
1361
2081
}
1362
2082
1363
2083
if(block_time <= 0){
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);
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);
1368
2088
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
2089
avahi_simple_poll_quit(s);
1370
2090
return 0;
1371
2091
}
1372
2092
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
2093
&mc->current_server->last_seen);
1374
2094
if(ret == -1){
1375
2095
perror_plus("clock_gettime");
1376
2096
return -1;
1377
2097
}
1378
mc.current_server = mc.current_server->next;
2098
mc->current_server = mc->current_server->next;
1379
2099
block_time = 0; /* Call avahi to find new Mandos
1380
2100
servers, but don't block */
1381
2101
}
1383
2103
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
2104
}
1385
2105
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
2106
if(ret > 0 or errno != EINTR){
1387
2107
return (ret != 1) ? ret : 0;
1388
2108
}
1389
2109
}
1390
2110
}
1391
2111
}
1392
2112
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,
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
1446
2115
const float delay){
1447
struct dirent **direntries;
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);
2139
if(numhooks == -1){
2140
perror_plus("scandir");
2141
close(devnull);
2142
return;
2143
}
1448
2144
struct dirent *direntry;
1449
2145
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
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");
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);
1460
2151
}
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){
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){
1468
2198
perror_plus("asprintf");
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
}
2199
_exit(EX_OSERR);
2200
}
2201
ret = setenv("DELAY", delaystring, 1);
2202
if(ret == -1){
1527
2203
free(delaystring);
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
}
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;
1539
2272
} else {
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;
2273
fprintf_plus(stderr, "Warning: network hook \"%s\""
2274
" crashed\n", direntry->d_name);
2275
free(direntry);
2276
continue;
2277
}
2278
}
2279
if(debug){
2280
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2281
direntry->d_name);
2282
}
2283
free(direntry);
2284
}
2285
free(direntries);
2286
if(close(hookdir_fd) == -1){
2287
perror_plus("close");
2288
} else {
2289
hookdir_fd = -1;
2290
}
2291
close(devnull);
1576
2292
}
1577
2293
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;
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;
1584
2299
struct ifreq network;
1585
2300
unsigned int if_index = if_nametoindex(interface);
1586
2301
if(if_index == 0){
1595
2310
}
1596
2311
1597
2312
if(not interface_is_up(interface)){
1598
if(not get_flags(interface, &network) and debug){
2313
int ret_errno = 0;
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network)){
1599
2316
ret_errno = errno;
1600
2317
fprintf_plus(stderr, "Failed to get flags for interface "
1601
2318
"\"%s\"\n", interface);
2319
errno = old_errno;
1602
2320
return ret_errno;
1603
2321
}
1604
network.ifr_flags |= IFF_UP;
2322
network.ifr_flags |= IFF_UP; /* set flag */
1605
2323
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2325
if(sd == -1){
1608
2326
ret_errno = errno;
1609
2327
perror_plus("socket");
1610
2328
errno = old_errno;
1611
2329
return ret_errno;
1612
2330
}
1613
2331
1614
2332
if(quit_now){
1615
close(sd);
2333
ret = close(sd);
2334
if(ret == -1){
2335
perror_plus("close");
2336
}
1616
2337
errno = old_errno;
1617
2338
return EINTR;
1618
2339
}
1622
2343
interface);
1623
2344
}
1624
2345
1625
/* Raise priviliges */
1626
raise_privileges();
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
}
1627
2352
1628
2353
#ifdef __linux__
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");
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
}
1636
2365
}
1637
2366
#endif /* __linux__ */
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
1640
2369
#ifdef __linux__
1641
2370
if(restore_loglevel){
1642
2371
ret_linux = klogctl(7, NULL, 0);
1646
2375
}
1647
2376
#endif /* __linux__ */
1648
2377
1649
/* Lower privileges */
1650
lower_privileges();
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
}
1651
2387
1652
2388
/* Close the socket */
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2389
ret = close(sd);
1654
2390
if(ret == -1){
1655
2391
perror_plus("close");
1656
2392
}
1657
2393
1658
2394
if(ret_setflags == -1){
1659
errno = ret_errno;
2395
errno = ioctl_errno;
1660
2396
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1661
2397
errno = old_errno;
1662
return ret_errno;
2398
return ioctl_errno;
1663
2399
}
1664
2400
} else if(debug){
1665
2401
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1668
2404
1669
2405
/* Sleep checking until interface is running.
1670
2406
Check every 0.25s, up to total time of delay */
1671
for(int i=0; i < delay * 4; i++){
2407
for(int i = 0; i < delay * 4; i++){
1672
2408
if(interface_is_running(interface)){
1673
2409
break;
1674
2410
}
1683
2419
return 0;
1684
2420
}
1685
2421
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;
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
1691
2425
struct ifreq network;
1692
2426
unsigned int if_index = if_nametoindex(interface);
1693
2427
if(if_index == 0){
1696
2430
return ENXIO;
1697
2431
}
1698
2432
if(interface_is_up(interface)){
2433
int ret_errno = 0;
2434
int ioctl_errno = 0;
1699
2435
if(not get_flags(interface, &network) and debug){
1700
2436
ret_errno = errno;
1701
2437
fprintf_plus(stderr, "Failed to get flags for interface "
1702
2438
"\"%s\"\n", interface);
2439
errno = old_errno;
1703
2440
return ret_errno;
1704
2441
}
1705
2442
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1706
2443
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2445
if(sd == -1){
1709
2446
ret_errno = errno;
1710
2447
perror_plus("socket");
1711
2448
errno = old_errno;
1717
2454
interface);
1718
2455
}
1719
2456
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();
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
}
1728
2476
1729
2477
/* Close the socket */
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2478
int ret = close(sd);
1731
2479
if(ret == -1){
1732
2480
perror_plus("close");
1733
2481
}
1734
2482
1735
2483
if(ret_setflags == -1){
1736
errno = ret_errno;
2484
errno = ioctl_errno;
1737
2485
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
2486
errno = old_errno;
1739
return ret_errno;
2487
return ioctl_errno;
1740
2488
}
1741
2489
} else if(debug){
1742
2490
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
2496
}
1749
2497
1750
2498
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 };
1751
2512
AvahiSServiceBrowser *sb = NULL;
1752
2513
error_t ret_errno;
1753
2514
int ret;
1754
2515
intmax_t tmpmax;
1755
2516
char *tmp;
1756
2517
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1759
2518
char *interfaces_to_take_down = NULL;
1760
2519
size_t interfaces_to_take_down_size = 0;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2520
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2521
char old_tempdir[] = "/tmp/mandosXXXXXX";
2522
char *tempdir = NULL;
1763
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1764
2524
const char *seckey = PATHDIR "/" SECKEY;
1765
2525
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;
1766
2531
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1768
2532
1769
2533
bool gnutls_initialized = false;
1770
2534
bool gpgme_initialized = false;
1816
2580
{ .name = "pubkey", .key = 'p',
1817
2581
.arg = "FILE",
1818
2582
.doc = "OpenPGP public key file base name",
1819
.group = 2 },
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 },
1820
2600
{ .name = "dh-bits", .key = 129,
1821
2601
.arg = "BITS",
1822
2602
.doc = "Bit length of the prime number used in the"
1823
2603
" Diffie-Hellman key exchange",
1824
2604
.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 },
1825
2610
{ .name = "priority", .key = 130,
1826
2611
.arg = "STRING",
1827
2612
.doc = "GnuTLS priority string for the TLS handshake",
1861
2646
connect_to = arg;
1862
2647
break;
1863
2648
case 'i': /* --interface */
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2649
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2650
arg, (int)',');
1866
2651
if(ret_errno != 0){
1867
2652
argp_error(state, "%s", strerror(ret_errno));
1868
2653
}
1873
2658
case 'p': /* --pubkey */
1874
2659
pubkey = arg;
1875
2660
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;
1876
2671
case 129: /* --dh-bits */
1877
2672
errno = 0;
1878
2673
tmpmax = strtoimax(arg, &tmp, 10);
1882
2677
}
1883
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1884
2679
break;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2682
break;
1885
2683
case 130: /* --priority */
1886
2684
mc.priority = arg;
1887
2685
break;
1910
2708
argp_state_help(state, state->out_stream,
1911
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1912
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
1913
2712
case -3: /* --usage */
1914
2713
argp_state_help(state, state->out_stream,
1915
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
1916
2716
case 'V': /* --version */
1917
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1918
2718
exit(argp_err_exit_status);
1927
2727
.args_doc = "",
1928
2728
.doc = "Mandos client -- Get and decrypt"
1929
2729
" passwords from a Mandos server" };
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2732
switch(ret_errno){
1933
2733
case 0:
1934
2734
break;
1935
2735
case ENOMEM:
1936
2736
default:
1937
errno = ret;
2737
errno = ret_errno;
1938
2738
perror_plus("argp_parse");
1939
2739
exitcode = EX_OSERR;
1940
2740
goto end;
1943
2743
goto end;
1944
2744
}
1945
2745
}
1946
2746
1947
2747
{
1948
/* Work around Debian bug #633582:
1949
<http://bugs.debian.org/633582> */
1950
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2748
/* Re-raise privileges */
2749
ret = raise_privileges();
2750
if(ret != 0){
2751
errno = ret;
2752
perror_plus("Failed to raise privileges");
2753
} else {
1953
2754
struct stat st;
1954
2755
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2758
1955
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1956
2760
int seckey_fd = open(seckey, O_RDONLY);
1957
2761
if(seckey_fd == -1){
1969
2773
}
1970
2774
}
1971
2775
}
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2776
close(seckey_fd);
1973
2777
}
1974
2778
}
1975
2779
1976
2780
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1977
2781
int pubkey_fd = open(pubkey, O_RDONLY);
1978
2782
if(pubkey_fd == -1){
1990
2794
}
1991
2795
}
1992
2796
}
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
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
1997
2832
/* Lower privileges */
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2833
ret = lower_privileges();
2834
if(ret != 0){
2835
errno = ret;
2836
perror_plus("Failed to lower privileges");
2002
2837
}
2003
2838
}
2004
2839
}
2005
2840
2006
/* Remove empty interface names */
2841
/* Remove invalid interface names (except "none") */
2007
2842
{
2008
2843
char *interface = NULL;
2009
while((interface = argz_next(interfaces, interfaces_size,
2844
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2010
2845
interface))){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2846
if(strcmp(interface, "none") != 0
2847
and if_nametoindex(interface) == 0){
2848
if(interface[0] != '\0'){
2013
2849
fprintf_plus(stderr, "Not using nonexisting interface"
2014
2850
" \"%s\"\n", interface);
2015
2851
}
2016
argz_delete(&interfaces, &interfaces_size, interface);
2852
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2017
2853
interface = NULL;
2018
2854
}
2019
2855
}
2021
2857
2022
2858
/* Run network hooks */
2023
2859
{
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2860
if(mc.interfaces != NULL){
2861
interfaces_hooks = malloc(mc.interfaces_size);
2027
2862
if(interfaces_hooks == NULL){
2028
2863
perror_plus("malloc");
2029
2864
goto end;
2030
2865
}
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
}
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);
2040
2871
}
2041
2872
2042
2873
if(not debug){
2047
2878
from the signal handler */
2048
2879
/* Initialize the pseudo-RNG for Avahi */
2049
2880
srand((unsigned int) time(NULL));
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2881
simple_poll = avahi_simple_poll_new();
2882
if(simple_poll == NULL){
2052
2883
fprintf_plus(stderr,
2053
2884
"Avahi: Failed to create simple poll object.\n");
2054
2885
exitcode = EX_UNAVAILABLE;
2119
2950
}
2120
2951
2121
2952
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2953
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2124
2955
/* Look for any good interfaces */
2125
2956
ret = scandir(sys_class_net, &direntries, good_interface,
2126
2957
alphasort);
2127
2958
if(ret >= 1){
2128
2959
/* Add all found interfaces to interfaces list */
2129
2960
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2131
2962
direntries[i]->d_name);
2132
2963
if(ret_errno != 0){
2964
errno = ret_errno;
2133
2965
perror_plus("argz_add");
2966
free(direntries[i]);
2134
2967
continue;
2135
2968
}
2136
2969
if(debug){
2137
2970
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
2971
direntries[i]->d_name);
2139
2972
}
2973
free(direntries[i]);
2140
2974
}
2141
2975
free(direntries);
2142
2976
} else {
2143
free(direntries);
2977
if(ret == 0){
2978
free(direntries);
2979
}
2144
2980
fprintf_plus(stderr, "Could not find a network interface\n");
2145
2981
exitcode = EXIT_FAILURE;
2146
2982
goto end;
2147
2983
}
2148
2984
}
2149
2985
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)){
2986
/* Bring up interfaces which are down, and remove any "none"s */
2987
{
2162
2988
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
2989
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2164
2990
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
}
2165
3007
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
3008
errno = bring_up_interface(interface, delay);
2167
3009
if(not interface_was_up){
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
3010
if(errno != 0){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2171
3013
} else {
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
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
}
2175
3020
}
2176
3021
}
2177
3022
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2181
3023
if(debug and (interfaces_to_take_down == NULL)){
2182
3024
fprintf_plus(stderr, "No interfaces were brought up\n");
2183
3025
}
2184
3026
}
2185
3027
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
2186
3037
if(quit_now){
2187
3038
goto end;
2188
3039
}
2189
3040
2190
ret = init_gnutls_global(pubkey, seckey);
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
2191
3048
if(ret == -1){
2192
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
3050
exitcode = EX_UNAVAILABLE;
2200
3057
goto end;
2201
3058
}
2202
3059
2203
if(mkdtemp(tempdir) == NULL){
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){
2204
3070
perror_plus("mkdtemp");
2205
3071
goto end;
2206
3072
}
2207
tempdir_created = true;
2208
3073
2209
3074
if(quit_now){
2210
3075
goto end;
2211
3076
}
2212
3077
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
3078
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2214
3079
fprintf_plus(stderr, "init_gpgme failed\n");
2215
3080
exitcode = EX_UNAVAILABLE;
2216
3081
goto end;
2246
3111
exitcode = EX_USAGE;
2247
3112
goto end;
2248
3113
}
2249
3114
2250
3115
if(quit_now){
2251
3116
goto end;
2252
3117
}
2273
3138
}
2274
3139
2275
3140
while(not quit_now){
2276
ret = start_mandos_communication(address, port, if_index, af);
3141
ret = start_mandos_communication(address, port, if_index, af,
3142
&mc);
2277
3143
if(quit_now or ret == 0){
2278
3144
break;
2279
3145
}
2281
3147
fprintf_plus(stderr, "Retrying in %d seconds\n",
2282
3148
(int)retry_interval);
2283
3149
}
2284
sleep((int)retry_interval);
3150
sleep((unsigned int)retry_interval);
2285
3151
}
2286
3152
2287
if (not quit_now){
3153
if(not quit_now){
2288
3154
exitcode = EXIT_SUCCESS;
2289
3155
}
2290
3156
2305
3171
config.publish_domain = 0;
2306
3172
2307
3173
/* Allocate a new server */
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
2311
3176
2312
3177
/* Free the Avahi configuration data */
2313
3178
avahi_server_config_free(&config);
2316
3181
/* Check if creating the Avahi server object succeeded */
2317
3182
if(mc.server == NULL){
2318
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2319
avahi_strerror(ret_errno));
3184
avahi_strerror(ret));
2320
3185
exitcode = EX_UNAVAILABLE;
2321
3186
goto end;
2322
3187
}
2328
3193
/* Create the Avahi service browser */
2329
3194
sb = avahi_s_service_browser_new(mc.server, if_index,
2330
3195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2331
NULL, 0, browse_callback, NULL);
3196
NULL, 0, browse_callback,
3197
(void *)&mc);
2332
3198
if(sb == NULL){
2333
3199
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2334
3200
avahi_strerror(avahi_server_errno(mc.server)));
2345
3211
if(debug){
2346
3212
fprintf_plus(stderr, "Starting Avahi loop search\n");
2347
3213
}
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
3214
3215
ret = avahi_loop_with_timeout(simple_poll,
3216
(int)(retry_interval * 1000), &mc);
2351
3217
if(debug){
2352
3218
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2353
3219
(ret == 0) ? "successfully" : "with error");
2356
3222
end:
2357
3223
2358
3224
if(debug){
2359
fprintf_plus(stderr, "%s exiting\n", argv[0]);
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
}
2360
3232
}
2361
3233
2362
3234
/* Cleanup things */
3235
free(mc.interfaces);
3236
2363
3237
if(sb != NULL)
2364
3238
avahi_s_service_browser_free(sb);
2365
3239
2366
3240
if(mc.server != NULL)
2367
3241
avahi_server_free(mc.server);
2368
3242
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
3243
if(simple_poll != NULL)
3244
avahi_simple_poll_free(simple_poll);
2371
3245
2372
3246
if(gnutls_initialized){
2373
3247
gnutls_certificate_free_credentials(mc.cred);
2374
gnutls_global_deinit();
2375
3248
gnutls_dh_params_deinit(mc.dh_params);
2376
3249
}
2377
3250
2385
3258
mc.current_server->prev->next = NULL;
2386
3259
while(mc.current_server != NULL){
2387
3260
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
2388
3269
free(mc.current_server);
2389
3270
mc.current_server = next;
2390
3271
}
2391
3272
}
2392
3273
2393
/* Re-raise priviliges */
3274
/* Re-raise privileges */
2394
3275
{
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();
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
}
2420
3310
}
2421
3311
2422
3312
free(interfaces_to_take_down);
2423
3313
free(interfaces_hooks);
2424
3314
3315
void clean_dir_at(int base, const char * const dirname,
3316
uintmax_t level){
3317
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){
3331
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
2425
3369
/* Removes the GPGME temp directory and all files inside */
2426
if(tempdir_created){
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
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
}
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
2459
3372
}
2460
3373
2461
3374
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0