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237.7.780
(compared to revision 237.2.55)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2021-02-01 19:30:45 UTC
- mto: This revision was merged to the branch mainline in revision 404.
- Revision ID: teddy@recompile.se-20210201193045-lpg6aprpc4srem6k
Fix issue with french translation
Initial white space was missing in both msgid and msgstr of the french
translation, leading to checking tools reporing an incomplete
translation. The string is a raw command line command, and therefore
did not need translation, so this was never a user-visible issue.
* debian/po/fr.po: Add missing whitespace to the id and translation
for msgid " mandos-keygen -F/dev/null|grep ^key_id".
Initial white space was missing in both msgid and msgstr of the french
translation, leading to checking tools reporing an incomplete
translation. The string is a raw command line command, and therefore
did not need translation, so this was never a user-visible issue.
* debian/po/fr.po: Add missing whitespace to the id and translation
for msgid " mandos-keygen -F/dev/null|grep ^key_id".
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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 © 2008-2020 Teddy Hogeborn
13
* Copyright © 2008-2020 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
31
32
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
34
#ifndef _LARGEFILE_SOURCE
33
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
#ifndef _FILE_OFFSET_BITS
34
38
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
35
40
36
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
42
38
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
42
46
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
49
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
53
#include <sys/ioctl.h> /* ioctl */
49
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
55
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
56
SOCK_STREAM, uid_t, gid_t, open(),
57
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
55
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
59
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
64
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
strtoimax() */
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
65
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
75
SIOCSIFFLAGS, if_indextoname(),
67
76
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
77
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
*/
69
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat(), lstat(), symlink() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
85
#include <iso646.h> /* not, or, and */
74
86
#include <argp.h> /* struct argp_option, error_t, struct
75
87
argp_state, struct argp,
76
88
argp_parse(), ARGP_KEY_ARG,
77
89
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
#include <signal.h> /* sigemptyset(), sigaddset(),
91
sigaction(), SIGTERM, sig_atomic_t,
92
raise() */
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
101
argz_count() */
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
104
105
#ifdef __linux__
78
106
#include <sys/klog.h> /* klogctl() */
107
#endif /* __linux__ */
79
108
80
109
/* Avahi */
81
110
/* All Avahi types, constants and functions
94
123
gnutls_*
95
124
init_gnutls_session(),
96
125
GNUTLS_* */
126
#if GNUTLS_VERSION_NUMBER < 0x030600
97
127
#include <gnutls/openpgp.h>
98
/* gnutls_certificate_set_openpgp_key_file(),
99
GNUTLS_OPENPGP_FMT_BASE64 */
128
/* gnutls_certificate_set_openpgp_key_file(),
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
132
GNUTLS_PKCS_PLAIN,
133
GNUTLS_PKCS_NULL_PASSWORD */
134
#endif
100
135
101
136
/* GPGME */
102
137
#include <gpgme.h> /* All GPGME types, constants and
110
145
#define PATHDIR "/conf/conf.d/mandos"
111
146
#define SECKEY "seckey.txt"
112
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
113
151
114
152
bool debug = false;
115
153
static const char mandos_protocol_version[] = "1";
116
154
const char *argp_program_version = "mandos-client " VERSION;
117
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
156
static const char sys_class_net[] = "/sys/class/net";
157
char *connect_to = NULL;
158
const char *hookdir = HOOKDIR;
159
int hookdir_fd = -1;
160
uid_t uid = 65534;
161
gid_t gid = 65534;
162
163
/* Doubly linked list that need to be circularly linked when used */
164
typedef struct server{
165
const char *ip;
166
in_port_t port;
167
AvahiIfIndex if_index;
168
int af;
169
struct timespec last_seen;
170
struct server *next;
171
struct server *prev;
172
} server;
118
173
119
174
/* Used for passing in values through the Avahi callback functions */
120
175
typedef struct {
121
AvahiSimplePoll *simple_poll;
122
176
AvahiServer *server;
123
177
gnutls_certificate_credentials_t cred;
124
178
unsigned int dh_bits;
125
179
gnutls_dh_params_t dh_params;
126
180
const char *priority;
127
181
gpgme_ctx_t ctx;
182
server *current_server;
183
char *interfaces;
184
size_t interfaces_size;
128
185
} mandos_context;
129
186
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
189
190
sig_atomic_t quit_now = 0;
191
int signal_received = 0;
192
193
/* Function to use when printing errors */
194
void perror_plus(const char *print_text){
195
int e = errno;
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
198
errno = e;
199
perror(print_text);
200
}
201
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
203
int fprintf_plus(FILE *stream, const char *format, ...){
204
va_list ap;
205
va_start (ap, format);
206
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
}
211
130
212
/*
131
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
132
* "buffer_capacity" is how much is currently allocated,
213
* Make additional room in "buffer" for at least BUFFER_SIZE more
214
* bytes. "buffer_capacity" is how much is currently allocated,
133
215
* "buffer_length" is how much is already used.
134
216
*/
135
size_t adjustbuffer(char **buffer, size_t buffer_length,
136
size_t buffer_capacity){
217
__attribute__((nonnull, warn_unused_result))
218
size_t incbuffer(char **buffer, size_t buffer_length,
219
size_t buffer_capacity){
137
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
138
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
139
if(buffer == NULL){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
if(new_buf == NULL){
223
int old_errno = errno;
224
free(*buffer);
225
errno = old_errno;
226
*buffer = NULL;
140
227
return 0;
141
228
}
229
*buffer = new_buf;
142
230
buffer_capacity += BUFFER_SIZE;
143
231
}
144
232
return buffer_capacity;
145
233
}
146
234
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
int af, server **current_server){
239
int ret;
240
server *new_server = malloc(sizeof(server));
241
if(new_server == NULL){
242
perror_plus("malloc");
243
return false;
244
}
245
*new_server = (server){ .ip = strdup(ip),
246
.port = port,
247
.if_index = if_index,
248
.af = af };
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
251
free(new_server);
252
return false;
253
}
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
255
if(ret == -1){
256
perror_plus("clock_gettime");
257
#ifdef __GNUC__
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
260
#endif
261
free((char *)(new_server->ip));
262
#ifdef __GNUC__
263
#pragma GCC diagnostic pop
264
#endif
265
free(new_server);
266
return false;
267
}
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
273
} else {
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
279
}
280
return true;
281
}
282
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
287
int ret = 0;
288
if(seteuid(0) == -1){
289
ret = errno;
290
}
291
errno = old_errno;
292
return ret;
293
}
294
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
300
if(ret != 0){
301
errno = old_errno;
302
return ret;
303
}
304
if(setuid(0) == -1){
305
ret = errno;
306
}
307
errno = old_errno;
308
return ret;
309
}
310
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
315
int ret = 0;
316
if(seteuid(uid) == -1){
317
ret = errno;
318
}
319
errno = old_errno;
320
return ret;
321
}
322
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
327
int ret = 0;
328
if(setuid(uid) == -1){
329
ret = errno;
330
}
331
errno = old_errno;
332
return ret;
333
}
334
147
335
/*
148
336
* Initialize GPGME.
149
337
*/
150
static bool init_gpgme(mandos_context *mc, const char *seckey,
151
const char *pubkey, const char *tempdir){
152
int ret;
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
342
mandos_context *mc){
153
343
gpgme_error_t rc;
154
344
gpgme_engine_info_t engine_info;
155
345
156
157
346
/*
158
347
* Helper function to insert pub and seckey to the engine keyring.
159
348
*/
160
bool import_key(const char *filename){
349
bool import_key(const char * const filename){
350
int ret;
161
351
int fd;
162
352
gpgme_data_t pgp_data;
163
353
164
354
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
165
355
if(fd == -1){
166
perror("open");
356
perror_plus("open");
167
357
return false;
168
358
}
169
359
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
362
do {
363
{
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
366
struct tm tm;
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
369
break;
370
}
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
372
break;
373
}
374
if(debug){
375
fprintf_plus(stderr, "System clock is January 1970");
376
}
377
} else {
378
if(debug){
379
fprintf_plus(stderr, "System clock is invalid");
380
}
381
}
382
}
383
struct stat keystat;
384
ret = fstat(fd, &keystat);
385
if(ret != 0){
386
perror_plus("fstat");
387
break;
388
}
389
ret = raise_privileges();
390
if(ret != 0){
391
errno = ret;
392
perror_plus("Failed to raise privileges");
393
break;
394
}
395
if(debug){
396
fprintf_plus(stderr,
397
"Setting system clock to key file mtime");
398
}
399
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
401
}
402
ret = lower_privileges();
403
if(ret != 0){
404
errno = ret;
405
perror_plus("Failed to lower privileges");
406
}
407
} while(false);
408
170
409
rc = gpgme_data_new_from_fd(&pgp_data, fd);
171
410
if(rc != GPG_ERR_NO_ERROR){
172
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
173
gpgme_strsource(rc), gpgme_strerror(rc));
411
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
174
413
return false;
175
414
}
176
415
177
416
rc = gpgme_op_import(mc->ctx, pgp_data);
178
417
if(rc != GPG_ERR_NO_ERROR){
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
180
gpgme_strsource(rc), gpgme_strerror(rc));
418
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
419
gpgme_strsource(rc), gpgme_strerror(rc));
181
420
return false;
182
421
}
422
{
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
429
fprintf_plus(stderr,
430
"The total number of considered keys: %d\n",
431
import_result->considered);
432
fprintf_plus(stderr,
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
435
fprintf_plus(stderr,
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
450
fprintf_plus(stderr,
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
453
fprintf_plus(stderr,
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
456
fprintf_plus(stderr,
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
466
import_status->fpr);
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
471
}
472
fprintf_plus(stderr, "Key status:\n");
473
fprintf_plus(stderr,
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
477
fprintf_plus(stderr,
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
481
fprintf_plus(stderr,
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
485
fprintf_plus(stderr,
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
489
fprintf_plus(stderr,
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
493
}
494
return false;
495
}
496
}
183
497
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
498
ret = close(fd);
185
499
if(ret == -1){
186
perror("close");
500
perror_plus("close");
187
501
}
188
502
gpgme_data_release(pgp_data);
189
503
return true;
190
504
}
191
505
192
506
if(debug){
193
fprintf(stderr, "Initialize gpgme\n");
507
fprintf_plus(stderr, "Initializing GPGME\n");
194
508
}
195
509
196
510
/* Init GPGME */
197
511
gpgme_check_version(NULL);
198
512
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
199
513
if(rc != GPG_ERR_NO_ERROR){
200
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
201
gpgme_strsource(rc), gpgme_strerror(rc));
514
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
515
gpgme_strsource(rc), gpgme_strerror(rc));
202
516
return false;
203
517
}
204
518
205
/* Set GPGME home directory for the OpenPGP engine only */
519
/* Set GPGME home directory for the OpenPGP engine only */
206
520
rc = gpgme_get_engine_info(&engine_info);
207
521
if(rc != GPG_ERR_NO_ERROR){
208
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
209
gpgme_strsource(rc), gpgme_strerror(rc));
522
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
523
gpgme_strsource(rc), gpgme_strerror(rc));
210
524
return false;
211
525
}
212
526
while(engine_info != NULL){
218
532
engine_info = engine_info->next;
219
533
}
220
534
if(engine_info == NULL){
221
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
535
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
536
tempdir);
222
537
return false;
223
538
}
224
539
225
540
/* Create new GPGME "context" */
226
541
rc = gpgme_new(&(mc->ctx));
227
542
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
543
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
544
gpgme_strsource(rc), gpgme_strerror(rc));
230
545
return false;
231
546
}
232
547
234
549
return false;
235
550
}
236
551
237
return true;
552
return true;
238
553
}
239
554
240
555
/*
241
556
* Decrypt OpenPGP data.
242
557
* Returns -1 on error
243
558
*/
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
559
__attribute__((nonnull, warn_unused_result))
560
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
561
size_t crypto_size,
247
char **plaintext){
562
char **plaintext,
563
mandos_context *mc){
248
564
gpgme_data_t dh_crypto, dh_plain;
249
565
gpgme_error_t rc;
250
566
ssize_t ret;
252
568
ssize_t plaintext_length = 0;
253
569
254
570
if(debug){
255
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
571
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
256
572
}
257
573
258
574
/* Create new GPGME data buffer from memory cryptotext */
259
575
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
260
576
0);
261
577
if(rc != GPG_ERR_NO_ERROR){
262
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
578
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
579
gpgme_strsource(rc), gpgme_strerror(rc));
264
580
return -1;
265
581
}
266
582
267
583
/* Create new empty GPGME data buffer for the plaintext */
268
584
rc = gpgme_data_new(&dh_plain);
269
585
if(rc != GPG_ERR_NO_ERROR){
270
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
271
gpgme_strsource(rc), gpgme_strerror(rc));
586
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
587
gpgme_strsource(rc), gpgme_strerror(rc));
272
588
gpgme_data_release(dh_crypto);
273
589
return -1;
274
590
}
277
593
data buffer */
278
594
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
279
595
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
596
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
597
gpgme_strsource(rc), gpgme_strerror(rc));
282
598
plaintext_length = -1;
283
599
if(debug){
284
600
gpgme_decrypt_result_t result;
285
601
result = gpgme_op_decrypt_result(mc->ctx);
286
602
if(result == NULL){
287
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
603
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
288
604
} else {
289
fprintf(stderr, "Unsupported algorithm: %s\n",
290
result->unsupported_algorithm);
291
fprintf(stderr, "Wrong key usage: %u\n",
292
result->wrong_key_usage);
605
if(result->unsupported_algorithm != NULL) {
606
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
607
result->unsupported_algorithm);
608
}
609
fprintf_plus(stderr, "Wrong key usage: %s\n",
610
result->wrong_key_usage ? "Yes" : "No");
293
611
if(result->file_name != NULL){
294
fprintf(stderr, "File name: %s\n", result->file_name);
612
fprintf_plus(stderr, "File name: %s\n", result->file_name);
295
613
}
296
gpgme_recipient_t recipient;
297
recipient = result->recipients;
298
if(recipient){
299
while(recipient != NULL){
300
fprintf(stderr, "Public key algorithm: %s\n",
301
gpgme_pubkey_algo_name(recipient->pubkey_algo));
302
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
303
fprintf(stderr, "Secret key available: %s\n",
304
recipient->status == GPG_ERR_NO_SECKEY
305
? "No" : "Yes");
306
recipient = recipient->next;
307
}
614
615
for(gpgme_recipient_t r = result->recipients; r != NULL;
616
r = r->next){
617
fprintf_plus(stderr, "Public key algorithm: %s\n",
618
gpgme_pubkey_algo_name(r->pubkey_algo));
619
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
620
fprintf_plus(stderr, "Secret key available: %s\n",
621
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
308
622
}
309
623
}
310
624
}
312
626
}
313
627
314
628
if(debug){
315
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
629
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
316
630
}
317
631
318
632
/* Seek back to the beginning of the GPGME plaintext data buffer */
319
633
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
320
perror("gpgme_data_seek");
634
perror_plus("gpgme_data_seek");
321
635
plaintext_length = -1;
322
636
goto decrypt_end;
323
637
}
324
638
325
639
*plaintext = NULL;
326
640
while(true){
327
plaintext_capacity = adjustbuffer(plaintext,
328
(size_t)plaintext_length,
329
plaintext_capacity);
641
plaintext_capacity = incbuffer(plaintext,
642
(size_t)plaintext_length,
643
plaintext_capacity);
330
644
if(plaintext_capacity == 0){
331
perror("adjustbuffer");
332
plaintext_length = -1;
333
goto decrypt_end;
645
perror_plus("incbuffer");
646
plaintext_length = -1;
647
goto decrypt_end;
334
648
}
335
649
336
650
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
341
655
break;
342
656
}
343
657
if(ret < 0){
344
perror("gpgme_data_read");
658
perror_plus("gpgme_data_read");
345
659
plaintext_length = -1;
346
660
goto decrypt_end;
347
661
}
349
663
}
350
664
351
665
if(debug){
352
fprintf(stderr, "Decrypted password is: ");
666
fprintf_plus(stderr, "Decrypted password is: ");
353
667
for(ssize_t i = 0; i < plaintext_length; i++){
354
668
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
355
669
}
366
680
return plaintext_length;
367
681
}
368
682
369
static const char * safer_gnutls_strerror(int value) {
370
const char *ret = gnutls_strerror(value); /* Spurious warning from
371
-Wunreachable-code */
372
if(ret == NULL)
373
ret = "(unknown)";
374
return ret;
683
__attribute__((warn_unused_result, const))
684
static const char *safe_string(const char *str){
685
if(str == NULL)
686
return "(unknown)";
687
return str;
688
}
689
690
__attribute__((warn_unused_result))
691
static const char *safer_gnutls_strerror(int value){
692
const char *ret = gnutls_strerror(value);
693
return safe_string(ret);
375
694
}
376
695
377
696
/* GnuTLS log function callback */
697
__attribute__((nonnull))
378
698
static void debuggnutls(__attribute__((unused)) int level,
379
699
const char* string){
380
fprintf(stderr, "GnuTLS: %s", string);
700
fprintf_plus(stderr, "GnuTLS: %s", string);
381
701
}
382
702
383
static int init_gnutls_global(mandos_context *mc,
384
const char *pubkeyfilename,
385
const char *seckeyfilename){
703
__attribute__((nonnull(1, 2, 4), warn_unused_result))
704
static int init_gnutls_global(const char *pubkeyfilename,
705
const char *seckeyfilename,
706
const char *dhparamsfilename,
707
mandos_context *mc){
386
708
int ret;
387
709
388
710
if(debug){
389
fprintf(stderr, "Initializing GnuTLS\n");
390
}
391
392
ret = gnutls_global_init();
393
if(ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "GnuTLS global_init: %s\n",
395
safer_gnutls_strerror(ret));
396
return -1;
711
fprintf_plus(stderr, "Initializing GnuTLS\n");
397
712
}
398
713
399
714
if(debug){
405
720
}
406
721
407
722
/* OpenPGP credentials */
408
gnutls_certificate_allocate_credentials(&mc->cred);
723
ret = gnutls_certificate_allocate_credentials(&mc->cred);
409
724
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
411
* from
412
* -Wunreachable-code
413
*/
414
safer_gnutls_strerror(ret));
415
gnutls_global_deinit();
725
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
safer_gnutls_strerror(ret));
416
727
return -1;
417
728
}
418
729
419
730
if(debug){
420
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
421
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
422
seckeyfilename);
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
733
pubkeyfilename,
734
seckeyfilename);
423
735
}
424
736
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
741
NULL, /* pass */
742
/* key_usage */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
744
NULL, /* names */
745
0, /* names_length */
746
/* privkey_flags */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
425
750
ret = gnutls_certificate_set_openpgp_key_file
426
751
(mc->cred, pubkeyfilename, seckeyfilename,
427
752
GNUTLS_OPENPGP_FMT_BASE64);
428
if(ret != GNUTLS_E_SUCCESS) {
429
fprintf(stderr,
430
"Error[%d] while reading the OpenPGP key pair ('%s',"
431
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
432
fprintf(stderr, "The GnuTLS error is: %s\n",
433
safer_gnutls_strerror(ret));
753
#else
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
755
#endif
756
if(ret != GNUTLS_E_SUCCESS){
757
fprintf_plus(stderr,
758
"Error[%d] while reading the key pair ('%s',"
759
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
safer_gnutls_strerror(ret));
434
762
goto globalfail;
435
763
}
436
764
437
765
/* GnuTLS server initialization */
438
766
ret = gnutls_dh_params_init(&mc->dh_params);
439
if(ret != GNUTLS_E_SUCCESS) {
440
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
441
" %s\n", safer_gnutls_strerror(ret));
442
goto globalfail;
443
}
444
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
445
if(ret != GNUTLS_E_SUCCESS) {
446
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
447
safer_gnutls_strerror(ret));
448
goto globalfail;
449
}
450
451
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
769
" initialization: %s\n",
770
safer_gnutls_strerror(ret));
771
goto globalfail;
772
}
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
776
do {
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
778
if(dhpfile == -1){
779
perror_plus("open");
780
dhparamsfilename = NULL;
781
break;
782
}
783
size_t params_capacity = 0;
784
while(true){
785
params_capacity = incbuffer((char **)¶ms.data,
786
(size_t)params.size,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
790
free(params.data);
791
params.data = NULL;
792
dhparamsfilename = NULL;
793
break;
794
}
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
797
BUFFER_SIZE);
798
/* EOF */
799
if(bytes_read == 0){
800
break;
801
}
802
/* check bytes_read for failure */
803
if(bytes_read < 0){
804
perror_plus("read");
805
free(params.data);
806
params.data = NULL;
807
dhparamsfilename = NULL;
808
break;
809
}
810
params.size += (unsigned int)bytes_read;
811
}
812
ret = close(dhpfile);
813
if(ret == -1){
814
perror_plus("close");
815
}
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
818
}
819
if(dhparamsfilename == NULL){
820
break;
821
}
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
829
}
830
free(params.data);
831
} while(false);
832
}
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
839
do {
840
int secfile = open(seckeyfilename, O_RDONLY);
841
if(secfile == -1){
842
perror_plus("open");
843
break;
844
}
845
size_t buffer_capacity = 0;
846
while(true){
847
buffer_capacity = incbuffer((char **)&buffer.data,
848
(size_t)buffer.size,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
852
free(buffer.data);
853
buffer.data = NULL;
854
break;
855
}
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
858
BUFFER_SIZE);
859
/* EOF */
860
if(bytes_read == 0){
861
break;
862
}
863
/* check bytes_read for failure */
864
if(bytes_read < 0){
865
perror_plus("read");
866
free(buffer.data);
867
buffer.data = NULL;
868
break;
869
}
870
buffer.size += (unsigned int)bytes_read;
871
}
872
close(secfile);
873
} while(false);
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
877
{
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
882
" structure: %s",
883
safer_gnutls_strerror(ret));
884
free(buffer.data);
885
buffer.data = NULL;
886
} else {
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
892
privkey = NULL;
893
}
894
free(buffer.data);
895
buffer.data = NULL;
896
if(privkey != NULL){
897
/* Use private key to suggest an appropriate
898
sec_param */
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
901
if(debug){
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)));
906
}
907
}
908
}
909
}
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
913
if(debug){
914
fprintf_plus(stderr, "Falling back to security parameter"
915
" \"%s\"\n",
916
safe_string(gnutls_sec_param_get_name
917
(sec_param)));
918
}
919
}
920
}
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
922
if(uret != 0){
923
mc->dh_bits = uret;
924
if(debug){
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
928
(sec_param)),
929
mc->dh_bits);
930
}
931
} else {
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
935
(sec_param)),
936
safer_gnutls_strerror(ret));
937
goto globalfail;
938
}
939
#endif
940
} else { /* dh_bits != 0 */
941
if(debug){
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
943
mc->dh_bits);
944
}
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
950
goto globalfail;
951
}
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
953
}
954
}
452
955
453
956
return 0;
454
957
455
958
globalfail:
456
959
457
960
gnutls_certificate_free_credentials(mc->cred);
458
gnutls_global_deinit();
459
961
gnutls_dh_params_deinit(mc->dh_params);
460
962
return -1;
461
963
}
462
964
463
static int init_gnutls_session(mandos_context *mc,
464
gnutls_session_t *session){
965
__attribute__((nonnull, warn_unused_result))
966
static int init_gnutls_session(gnutls_session_t *session,
967
mandos_context *mc){
465
968
int ret;
466
969
/* GnuTLS session creation */
467
ret = gnutls_init(session, GNUTLS_SERVER);
970
do {
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
973
| GNUTLS_NO_TICKETS
974
#endif
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
977
#endif
978
));
979
if(quit_now){
980
return -1;
981
}
982
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
468
983
if(ret != GNUTLS_E_SUCCESS){
469
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
470
safer_gnutls_strerror(ret));
984
fprintf_plus(stderr,
985
"Error in GnuTLS session initialization: %s\n",
986
safer_gnutls_strerror(ret));
471
987
}
472
988
473
989
{
474
990
const char *err;
475
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
476
if(ret != GNUTLS_E_SUCCESS) {
477
fprintf(stderr, "Syntax error at: %s\n", err);
478
fprintf(stderr, "GnuTLS error: %s\n",
479
safer_gnutls_strerror(ret));
991
do {
992
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
993
if(quit_now){
994
gnutls_deinit(*session);
995
return -1;
996
}
997
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
998
if(ret != GNUTLS_E_SUCCESS){
999
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1000
fprintf_plus(stderr, "GnuTLS error: %s\n",
1001
safer_gnutls_strerror(ret));
480
1002
gnutls_deinit(*session);
481
1003
return -1;
482
1004
}
483
1005
}
484
1006
485
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
486
mc->cred);
487
if(ret != GNUTLS_E_SUCCESS) {
488
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
489
safer_gnutls_strerror(ret));
1007
do {
1008
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1009
mc->cred);
1010
if(quit_now){
1011
gnutls_deinit(*session);
1012
return -1;
1013
}
1014
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
1015
if(ret != GNUTLS_E_SUCCESS){
1016
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1017
safer_gnutls_strerror(ret));
490
1018
gnutls_deinit(*session);
491
1019
return -1;
492
1020
}
493
1021
494
1022
/* ignore client certificate if any. */
495
gnutls_certificate_server_set_request(*session,
496
GNUTLS_CERT_IGNORE);
497
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
1023
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
1024
500
1025
return 0;
501
1026
}
504
1029
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
505
1030
__attribute__((unused)) const char *txt){}
506
1031
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1037
int ret;
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1044
if(debug){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1047
}
1048
return false;
1049
}
1050
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1054
return false;
1055
}
1056
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1058
if(devnull == -1){
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1060
return false;
1061
}
1062
pid_t pid = fork();
1063
if(pid == 0){
1064
/* Child */
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1067
if(errno != 0){
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1070
} else {
1071
/* Set group */
1072
errno = 0;
1073
ret = setgid(0);
1074
if(ret == -1){
1075
perror_plus("setgid");
1076
close(devnull);
1077
_exit(EX_NOPERM);
1078
}
1079
/* Reset supplementary groups */
1080
errno = 0;
1081
ret = setgroups(0, NULL);
1082
if(ret == -1){
1083
perror_plus("setgroups");
1084
close(devnull);
1085
_exit(EX_NOPERM);
1086
}
1087
}
1088
ret = dup2(devnull, STDIN_FILENO);
1089
if(ret == -1){
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1091
close(devnull);
1092
_exit(EX_OSERR);
1093
}
1094
ret = close(devnull);
1095
if(ret == -1){
1096
perror_plus("close");
1097
}
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
if(ret == -1){
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1101
_exit(EX_OSERR);
1102
}
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1104
O_RDONLY
1105
| O_DIRECTORY
1106
| O_PATH
1107
| O_CLOEXEC));
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1111
}
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
helper, O_RDONLY));
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1118
}
1119
close(helperdir_fd);
1120
#ifdef __GNUC__
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
#endif
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1127
environ) == -1){
1128
#ifdef __GNUC__
1129
#pragma GCC diagnostic pop
1130
#endif
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1133
}
1134
}
1135
if(pid == -1){
1136
perror_plus("fork");
1137
close(devnull);
1138
return false;
1139
}
1140
ret = close(devnull);
1141
if(ret == -1){
1142
perror_plus("close");
1143
}
1144
int status;
1145
pid_t pret = -1;
1146
errno = 0;
1147
do {
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1155
}
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1158
}
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1161
" helper program");
1162
}
1163
return false;
1164
}
1165
} while(pret == -1 and errno == EINTR);
1166
if(pret == -1){
1167
perror_plus("waitpid");
1168
return false;
1169
}
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1174
return false;
1175
}
1176
return true;
1177
}
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1181
return false;
1182
}
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1184
return false;
1185
}
1186
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1190
if(debug){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1192
}
1193
return add_delete_local_route(true, address, if_index);
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1199
if(debug){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1201
}
1202
return add_delete_local_route(false, address, if_index);
1203
}
1204
507
1205
/* Called when a Mandos server is found */
508
static int start_mandos_communication(const char *ip, uint16_t port,
1206
__attribute__((nonnull, warn_unused_result))
1207
static int start_mandos_communication(const char *ip, in_port_t port,
509
1208
AvahiIfIndex if_index,
510
mandos_context *mc){
511
int ret, tcp_sd;
1209
int af, mandos_context *mc){
1210
int ret, tcp_sd = -1;
512
1211
ssize_t sret;
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1212
struct sockaddr_storage to;
514
1213
char *buffer = NULL;
515
char *decrypted_buffer;
1214
char *decrypted_buffer = NULL;
516
1215
size_t buffer_length = 0;
517
1216
size_t buffer_capacity = 0;
518
ssize_t decrypted_buffer_size;
519
1217
size_t written;
520
int retval = 0;
521
char interface[IF_NAMESIZE];
1218
int retval = -1;
522
1219
gnutls_session_t session;
523
524
ret = init_gnutls_session(mc, &session);
1220
int pf; /* Protocol family */
1221
bool route_added = false;
1222
1223
errno = 0;
1224
1225
if(quit_now){
1226
errno = EINTR;
1227
return -1;
1228
}
1229
1230
switch(af){
1231
case AF_INET6:
1232
pf = PF_INET6;
1233
break;
1234
case AF_INET:
1235
pf = PF_INET;
1236
break;
1237
default:
1238
fprintf_plus(stderr, "Bad address family: %d\n", af);
1239
errno = EINVAL;
1240
return -1;
1241
}
1242
1243
/* If the interface is specified and we have a list of interfaces */
1244
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1245
/* Check if the interface is one of the interfaces we are using */
1246
bool match = false;
1247
{
1248
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1251
interface))){
1252
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
match = true;
1254
break;
1255
}
1256
}
1257
}
1258
if(not match){
1259
/* This interface does not match any in the list, so we don't
1260
connect to the server */
1261
if(debug){
1262
char interface[IF_NAMESIZE];
1263
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1264
perror_plus("if_indextoname");
1265
} else {
1266
fprintf_plus(stderr, "Skipping server on non-used interface"
1267
" \"%s\"\n",
1268
if_indextoname((unsigned int)if_index,
1269
interface));
1270
}
1271
}
1272
return -1;
1273
}
1274
}
1275
1276
ret = init_gnutls_session(&session, mc);
525
1277
if(ret != 0){
526
1278
return -1;
527
1279
}
528
1280
529
1281
if(debug){
530
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
531
"\n", ip, port);
532
}
533
534
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
535
if(tcp_sd < 0) {
536
perror("socket");
537
return -1;
538
}
539
540
if(debug){
541
if(if_indextoname((unsigned int)if_index, interface) == NULL){
542
perror("if_indextoname");
543
return -1;
544
}
545
fprintf(stderr, "Binding to interface %s\n", interface);
546
}
547
548
memset(&to, 0, sizeof(to));
549
to.in6.sin6_family = AF_INET6;
550
/* It would be nice to have a way to detect if we were passed an
551
IPv4 address here. Now we assume an IPv6 address. */
552
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1282
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1283
PRIuMAX "\n", ip, (uintmax_t)port);
1284
}
1285
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1287
if(tcp_sd < 0){
1288
int e = errno;
1289
perror_plus("socket");
1290
errno = e;
1291
goto mandos_end;
1292
}
1293
1294
if(quit_now){
1295
errno = EINTR;
1296
goto mandos_end;
1297
}
1298
1299
if(af == AF_INET6){
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
1303
} else { /* IPv4 */
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
1307
}
553
1308
if(ret < 0 ){
554
perror("inet_pton");
555
return -1;
1309
int e = errno;
1310
perror_plus("inet_pton");
1311
errno = e;
1312
goto mandos_end;
556
1313
}
557
1314
if(ret == 0){
558
fprintf(stderr, "Bad address: %s\n", ip);
559
return -1;
560
}
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wconversion and
563
-Wunreachable-code */
1315
int e = errno;
1316
fprintf_plus(stderr, "Bad address: %s\n", ip);
1317
errno = e;
1318
goto mandos_end;
1319
}
1320
if(af == AF_INET6){
1321
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1322
if(IN6_IS_ADDR_LINKLOCAL
1323
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1324
if(if_index == AVAHI_IF_UNSPEC){
1325
fprintf_plus(stderr, "An IPv6 link-local address is"
1326
" incomplete without a network interface\n");
1327
errno = EINVAL;
1328
goto mandos_end;
1329
}
1330
/* Set the network interface number as scope */
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1332
}
1333
} else {
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
1335
}
564
1336
565
to.in6.sin6_scope_id = (uint32_t)if_index;
1337
if(quit_now){
1338
errno = EINTR;
1339
goto mandos_end;
1340
}
566
1341
567
1342
if(debug){
568
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
569
port);
570
char addrstr[INET6_ADDRSTRLEN] = "";
571
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
572
sizeof(addrstr)) == NULL){
573
perror("inet_ntop");
574
} else {
575
if(strcmp(addrstr, ip) != 0){
576
fprintf(stderr, "Canonical address form: %s\n", addrstr);
577
}
578
}
579
}
580
581
ret = connect(tcp_sd, &to.in, sizeof(to));
582
if(ret < 0){
583
perror("connect");
584
return -1;
1343
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1344
char interface[IF_NAMESIZE];
1345
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1346
perror_plus("if_indextoname");
1347
} else {
1348
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1349
"\n", ip, interface, (uintmax_t)port);
1350
}
1351
} else {
1352
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1353
ip, (uintmax_t)port);
1354
}
1355
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1356
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1357
if(af == AF_INET6){
1358
ret = getnameinfo((struct sockaddr *)&to,
1359
sizeof(struct sockaddr_in6),
1360
addrstr, sizeof(addrstr), NULL, 0,
1361
NI_NUMERICHOST);
1362
} else {
1363
ret = getnameinfo((struct sockaddr *)&to,
1364
sizeof(struct sockaddr_in),
1365
addrstr, sizeof(addrstr), NULL, 0,
1366
NI_NUMERICHOST);
1367
}
1368
if(ret == EAI_SYSTEM){
1369
perror_plus("getnameinfo");
1370
} else if(ret != 0) {
1371
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1372
} else if(strcmp(addrstr, ip) != 0){
1373
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1374
}
1375
}
1376
1377
if(quit_now){
1378
errno = EINTR;
1379
goto mandos_end;
1380
}
1381
1382
while(true){
1383
if(af == AF_INET6){
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1386
} else {
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1389
}
1390
if(ret < 0){
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1397
&to)->sin6_addr)))
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1408
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1412
*/
1413
if(debug){
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1415
" direct route\n");
1416
}
1417
int e = errno;
1418
route_added = add_local_route(ip, if_index);
1419
if(route_added){
1420
continue;
1421
}
1422
errno = e;
1423
}
1424
if(errno != ECONNREFUSED or debug){
1425
int e = errno;
1426
perror_plus("connect");
1427
errno = e;
1428
}
1429
goto mandos_end;
1430
}
1431
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
break;
585
1437
}
586
1438
587
1439
const char *out = mandos_protocol_version;
589
1441
while(true){
590
1442
size_t out_size = strlen(out);
591
1443
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
592
out_size - written));
1444
out_size - written));
593
1445
if(ret == -1){
594
perror("write");
595
retval = -1;
1446
int e = errno;
1447
perror_plus("write");
1448
errno = e;
596
1449
goto mandos_end;
597
1450
}
598
1451
written += (size_t)ret;
606
1459
break;
607
1460
}
608
1461
}
1462
1463
if(quit_now){
1464
errno = EINTR;
1465
goto mandos_end;
1466
}
609
1467
}
610
1468
611
1469
if(debug){
612
fprintf(stderr, "Establishing TLS session with %s\n", ip);
613
}
614
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
616
617
do{
1470
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1471
}
1472
1473
if(quit_now){
1474
errno = EINTR;
1475
goto mandos_end;
1476
}
1477
1478
/* This casting via intptr_t is to eliminate warning about casting
1479
an int to a pointer type. This is exactly how the GnuTLS Guile
1480
function "set-session-transport-fd!" does it. */
1481
gnutls_transport_set_ptr(session,
1482
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1483
1484
if(quit_now){
1485
errno = EINTR;
1486
goto mandos_end;
1487
}
1488
1489
do {
618
1490
ret = gnutls_handshake(session);
1491
if(quit_now){
1492
errno = EINTR;
1493
goto mandos_end;
1494
}
619
1495
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
620
1496
621
1497
if(ret != GNUTLS_E_SUCCESS){
622
1498
if(debug){
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1499
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
624
1500
gnutls_perror(ret);
625
1501
}
626
retval = -1;
1502
errno = EPROTO;
627
1503
goto mandos_end;
628
1504
}
629
1505
630
1506
/* Read OpenPGP packet that contains the wanted password */
631
1507
632
1508
if(debug){
633
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
634
ip);
1509
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1510
" %s\n", ip);
635
1511
}
636
1512
637
1513
while(true){
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
639
buffer_capacity);
1514
1515
if(quit_now){
1516
errno = EINTR;
1517
goto mandos_end;
1518
}
1519
1520
buffer_capacity = incbuffer(&buffer, buffer_length,
1521
buffer_capacity);
640
1522
if(buffer_capacity == 0){
641
perror("adjustbuffer");
642
retval = -1;
1523
int e = errno;
1524
perror_plus("incbuffer");
1525
errno = e;
1526
goto mandos_end;
1527
}
1528
1529
if(quit_now){
1530
errno = EINTR;
643
1531
goto mandos_end;
644
1532
}
645
1533
654
1542
case GNUTLS_E_AGAIN:
655
1543
break;
656
1544
case GNUTLS_E_REHANDSHAKE:
657
do{
1545
do {
658
1546
ret = gnutls_handshake(session);
1547
1548
if(quit_now){
1549
errno = EINTR;
1550
goto mandos_end;
1551
}
659
1552
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
660
1553
if(ret < 0){
661
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1554
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1555
"***\n");
662
1556
gnutls_perror(ret);
663
retval = -1;
1557
errno = EPROTO;
664
1558
goto mandos_end;
665
1559
}
666
1560
break;
667
1561
default:
668
fprintf(stderr, "Unknown error while reading data from"
669
" encrypted session with Mandos server\n");
670
retval = -1;
1562
fprintf_plus(stderr, "Unknown error while reading data from"
1563
" encrypted session with Mandos server\n");
671
1564
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1565
errno = EIO;
672
1566
goto mandos_end;
673
1567
}
674
1568
} else {
677
1571
}
678
1572
679
1573
if(debug){
680
fprintf(stderr, "Closing TLS session\n");
681
}
682
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1574
fprintf_plus(stderr, "Closing TLS session\n");
1575
}
1576
1577
if(quit_now){
1578
errno = EINTR;
1579
goto mandos_end;
1580
}
1581
1582
do {
1583
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1584
if(quit_now){
1585
errno = EINTR;
1586
goto mandos_end;
1587
}
1588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
684
1589
685
1590
if(buffer_length > 0){
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
687
buffer_length,
688
&decrypted_buffer);
1591
ssize_t decrypted_buffer_size;
1592
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1593
&decrypted_buffer, mc);
689
1594
if(decrypted_buffer_size >= 0){
1595
1596
clearerr(stdout);
690
1597
written = 0;
691
1598
while(written < (size_t) decrypted_buffer_size){
1599
if(quit_now){
1600
errno = EINTR;
1601
goto mandos_end;
1602
}
1603
692
1604
ret = (int)fwrite(decrypted_buffer + written, 1,
693
1605
(size_t)decrypted_buffer_size - written,
694
1606
stdout);
695
1607
if(ret == 0 and ferror(stdout)){
1608
int e = errno;
696
1609
if(debug){
697
fprintf(stderr, "Error writing encrypted data: %s\n",
698
strerror(errno));
1610
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1611
strerror(errno));
699
1612
}
700
retval = -1;
701
break;
1613
errno = e;
1614
goto mandos_end;
702
1615
}
703
1616
written += (size_t)ret;
704
1617
}
705
free(decrypted_buffer);
706
} else {
707
retval = -1;
1618
ret = fflush(stdout);
1619
if(ret != 0){
1620
int e = errno;
1621
if(debug){
1622
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1623
strerror(errno));
1624
}
1625
errno = e;
1626
goto mandos_end;
1627
}
1628
retval = 0;
708
1629
}
709
} else {
710
retval = -1;
711
1630
}
712
1631
713
1632
/* Shutdown procedure */
714
1633
715
1634
mandos_end:
716
free(buffer);
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
718
if(ret == -1){
719
perror("close");
1635
{
1636
if(route_added){
1637
if(not delete_local_route(ip, if_index)){
1638
fprintf_plus(stderr, "Failed to delete local route to %s on"
1639
" interface %d", ip, if_index);
1640
}
1641
}
1642
int e = errno;
1643
free(decrypted_buffer);
1644
free(buffer);
1645
if(tcp_sd >= 0){
1646
ret = close(tcp_sd);
1647
}
1648
if(ret == -1){
1649
if(e == 0){
1650
e = errno;
1651
}
1652
perror_plus("close");
1653
}
1654
gnutls_deinit(session);
1655
errno = e;
1656
if(quit_now){
1657
errno = EINTR;
1658
retval = -1;
1659
}
720
1660
}
721
gnutls_deinit(session);
722
1661
return retval;
723
1662
}
724
1663
725
1664
static void resolve_callback(AvahiSServiceResolver *r,
726
1665
AvahiIfIndex interface,
727
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1666
AvahiProtocol proto,
728
1667
AvahiResolverEvent event,
729
1668
const char *name,
730
1669
const char *type,
735
1674
AVAHI_GCC_UNUSED AvahiStringList *txt,
736
1675
AVAHI_GCC_UNUSED AvahiLookupResultFlags
737
1676
flags,
738
void* userdata) {
739
mandos_context *mc = userdata;
740
assert(r);
1677
void *mc){
1678
if(r == NULL){
1679
return;
1680
}
741
1681
742
1682
/* Called whenever a service has been resolved successfully or
743
1683
timed out */
744
1684
745
switch(event) {
1685
if(quit_now){
1686
avahi_s_service_resolver_free(r);
1687
return;
1688
}
1689
1690
switch(event){
746
1691
default:
747
1692
case AVAHI_RESOLVER_FAILURE:
748
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
749
" of type '%s' in domain '%s': %s\n", name, type, domain,
750
avahi_strerror(avahi_server_errno(mc->server)));
1693
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1694
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1695
domain,
1696
avahi_strerror(avahi_server_errno
1697
(((mandos_context*)mc)->server)));
751
1698
break;
752
1699
753
1700
case AVAHI_RESOLVER_FOUND:
755
1702
char ip[AVAHI_ADDRESS_STR_MAX];
756
1703
avahi_address_snprint(ip, sizeof(ip), address);
757
1704
if(debug){
758
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
760
ip, (intmax_t)interface, port);
1705
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1706
PRIdMAX ") on port %" PRIu16 "\n", name,
1707
host_name, ip, (intmax_t)interface, port);
761
1708
}
762
int ret = start_mandos_communication(ip, port, interface, mc);
1709
int ret = start_mandos_communication(ip, (in_port_t)port,
1710
interface,
1711
avahi_proto_to_af(proto),
1712
mc);
763
1713
if(ret == 0){
764
avahi_simple_poll_quit(mc->simple_poll);
1714
avahi_simple_poll_quit(simple_poll);
1715
} else {
1716
if(not add_server(ip, (in_port_t)port, interface,
1717
avahi_proto_to_af(proto),
1718
&((mandos_context*)mc)->current_server)){
1719
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1720
" list\n", name);
1721
}
765
1722
}
766
1723
}
767
1724
}
768
1725
avahi_s_service_resolver_free(r);
769
1726
}
770
1727
771
static void browse_callback( AvahiSServiceBrowser *b,
772
AvahiIfIndex interface,
773
AvahiProtocol protocol,
774
AvahiBrowserEvent event,
775
const char *name,
776
const char *type,
777
const char *domain,
778
AVAHI_GCC_UNUSED AvahiLookupResultFlags
779
flags,
780
void* userdata) {
781
mandos_context *mc = userdata;
782
assert(b);
1728
static void browse_callback(AvahiSServiceBrowser *b,
1729
AvahiIfIndex interface,
1730
AvahiProtocol protocol,
1731
AvahiBrowserEvent event,
1732
const char *name,
1733
const char *type,
1734
const char *domain,
1735
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1736
flags,
1737
void *mc){
1738
if(b == NULL){
1739
return;
1740
}
783
1741
784
1742
/* Called whenever a new services becomes available on the LAN or
785
1743
is removed from the LAN */
786
1744
787
switch(event) {
1745
if(quit_now){
1746
return;
1747
}
1748
1749
switch(event){
788
1750
default:
789
1751
case AVAHI_BROWSER_FAILURE:
790
1752
791
fprintf(stderr, "(Avahi browser) %s\n",
792
avahi_strerror(avahi_server_errno(mc->server)));
793
avahi_simple_poll_quit(mc->simple_poll);
1753
fprintf_plus(stderr, "(Avahi browser) %s\n",
1754
avahi_strerror(avahi_server_errno
1755
(((mandos_context*)mc)->server)));
1756
avahi_simple_poll_quit(simple_poll);
794
1757
return;
795
1758
796
1759
case AVAHI_BROWSER_NEW:
799
1762
the callback function is called the Avahi server will free the
800
1763
resolver for us. */
801
1764
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
803
protocol, name, type, domain,
804
AVAHI_PROTO_INET6, 0,
805
resolve_callback, mc)))
806
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
807
name, avahi_strerror(avahi_server_errno(mc->server)));
1765
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1766
interface, protocol, name, type,
1767
domain, protocol, 0,
1768
resolve_callback, mc) == NULL)
1769
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1770
" %s\n", name,
1771
avahi_strerror(avahi_server_errno
1772
(((mandos_context*)mc)->server)));
808
1773
break;
809
1774
810
1775
case AVAHI_BROWSER_REMOVE:
813
1778
case AVAHI_BROWSER_ALL_FOR_NOW:
814
1779
case AVAHI_BROWSER_CACHE_EXHAUSTED:
815
1780
if(debug){
816
fprintf(stderr, "No Mandos server found, still searching...\n");
1781
fprintf_plus(stderr, "No Mandos server found, still"
1782
" searching...\n");
817
1783
}
818
1784
break;
819
1785
}
820
1786
}
821
1787
1788
/* Signal handler that stops main loop after SIGTERM */
1789
static void handle_sigterm(int sig){
1790
if(quit_now){
1791
return;
1792
}
1793
quit_now = 1;
1794
signal_received = sig;
1795
int old_errno = errno;
1796
/* set main loop to exit */
1797
if(simple_poll != NULL){
1798
avahi_simple_poll_quit(simple_poll);
1799
}
1800
errno = old_errno;
1801
}
1802
1803
__attribute__((nonnull, warn_unused_result))
1804
bool get_flags(const char *ifname, struct ifreq *ifr){
1805
int ret;
1806
int old_errno;
1807
1808
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1809
if(s < 0){
1810
old_errno = errno;
1811
perror_plus("socket");
1812
errno = old_errno;
1813
return false;
1814
}
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1817
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1818
if(ret == -1){
1819
if(debug){
1820
old_errno = errno;
1821
perror_plus("ioctl SIOCGIFFLAGS");
1822
errno = old_errno;
1823
}
1824
if((close(s) == -1) and debug){
1825
old_errno = errno;
1826
perror_plus("close");
1827
errno = old_errno;
1828
}
1829
return false;
1830
}
1831
if((close(s) == -1) and debug){
1832
old_errno = errno;
1833
perror_plus("close");
1834
errno = old_errno;
1835
}
1836
return true;
1837
}
1838
1839
__attribute__((nonnull, warn_unused_result))
1840
bool good_flags(const char *ifname, const struct ifreq *ifr){
1841
1842
/* Reject the loopback device */
1843
if(ifr->ifr_flags & IFF_LOOPBACK){
1844
if(debug){
1845
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1846
ifname);
1847
}
1848
return false;
1849
}
1850
/* Accept point-to-point devices only if connect_to is specified */
1851
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1852
if(debug){
1853
fprintf_plus(stderr, "Accepting point-to-point interface"
1854
" \"%s\"\n", ifname);
1855
}
1856
return true;
1857
}
1858
/* Otherwise, reject non-broadcast-capable devices */
1859
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1860
if(debug){
1861
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1862
" \"%s\"\n", ifname);
1863
}
1864
return false;
1865
}
1866
/* Reject non-ARP interfaces (including dummy interfaces) */
1867
if(ifr->ifr_flags & IFF_NOARP){
1868
if(debug){
1869
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1870
ifname);
1871
}
1872
return false;
1873
}
1874
1875
/* Accept this device */
1876
if(debug){
1877
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1878
}
1879
return true;
1880
}
1881
1882
/*
1883
* This function determines if a directory entry in /sys/class/net
1884
* corresponds to an acceptable network device.
1885
* (This function is passed to scandir(3) as a filter function.)
1886
*/
1887
__attribute__((nonnull, warn_unused_result))
1888
int good_interface(const struct dirent *if_entry){
1889
if(if_entry->d_name[0] == '.'){
1890
return 0;
1891
}
1892
1893
struct ifreq ifr;
1894
if(not get_flags(if_entry->d_name, &ifr)){
1895
if(debug){
1896
fprintf_plus(stderr, "Failed to get flags for interface "
1897
"\"%s\"\n", if_entry->d_name);
1898
}
1899
return 0;
1900
}
1901
1902
if(not good_flags(if_entry->d_name, &ifr)){
1903
return 0;
1904
}
1905
return 1;
1906
}
1907
1908
/*
1909
* This function determines if a network interface is up.
1910
*/
1911
__attribute__((nonnull, warn_unused_result))
1912
bool interface_is_up(const char *interface){
1913
struct ifreq ifr;
1914
if(not get_flags(interface, &ifr)){
1915
if(debug){
1916
fprintf_plus(stderr, "Failed to get flags for interface "
1917
"\"%s\"\n", interface);
1918
}
1919
return false;
1920
}
1921
1922
return (bool)(ifr.ifr_flags & IFF_UP);
1923
}
1924
1925
/*
1926
* This function determines if a network interface is running
1927
*/
1928
__attribute__((nonnull, warn_unused_result))
1929
bool interface_is_running(const char *interface){
1930
struct ifreq ifr;
1931
if(not get_flags(interface, &ifr)){
1932
if(debug){
1933
fprintf_plus(stderr, "Failed to get flags for interface "
1934
"\"%s\"\n", interface);
1935
}
1936
return false;
1937
}
1938
1939
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1940
}
1941
1942
__attribute__((nonnull, pure, warn_unused_result))
1943
int notdotentries(const struct dirent *direntry){
1944
/* Skip "." and ".." */
1945
if(direntry->d_name[0] == '.'
1946
and (direntry->d_name[1] == '\0'
1947
or (direntry->d_name[1] == '.'
1948
and direntry->d_name[2] == '\0'))){
1949
return 0;
1950
}
1951
return 1;
1952
}
1953
1954
/* Is this directory entry a runnable program? */
1955
__attribute__((nonnull, warn_unused_result))
1956
int runnable_hook(const struct dirent *direntry){
1957
int ret;
1958
size_t sret;
1959
struct stat st;
1960
1961
if((direntry->d_name)[0] == '\0'){
1962
/* Empty name? */
1963
return 0;
1964
}
1965
1966
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1967
"abcdefghijklmnopqrstuvwxyz"
1968
"0123456789"
1969
"_.-");
1970
if((direntry->d_name)[sret] != '\0'){
1971
/* Contains non-allowed characters */
1972
if(debug){
1973
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1974
direntry->d_name);
1975
}
1976
return 0;
1977
}
1978
1979
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1980
if(ret == -1){
1981
if(debug){
1982
perror_plus("Could not stat hook");
1983
}
1984
return 0;
1985
}
1986
if(not (S_ISREG(st.st_mode))){
1987
/* Not a regular file */
1988
if(debug){
1989
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1990
direntry->d_name);
1991
}
1992
return 0;
1993
}
1994
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1995
/* Not executable */
1996
if(debug){
1997
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1998
direntry->d_name);
1999
}
2000
return 0;
2001
}
2002
if(debug){
2003
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2004
direntry->d_name);
2005
}
2006
return 1;
2007
}
2008
2009
__attribute__((nonnull, warn_unused_result))
2010
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2011
mandos_context *mc){
2012
int ret;
2013
struct timespec now;
2014
struct timespec waited_time;
2015
intmax_t block_time;
2016
2017
while(true){
2018
if(mc->current_server == NULL){
2019
if(debug){
2020
fprintf_plus(stderr, "Wait until first server is found."
2021
" No timeout!\n");
2022
}
2023
ret = avahi_simple_poll_iterate(s, -1);
2024
} else {
2025
if(debug){
2026
fprintf_plus(stderr, "Check current_server if we should run"
2027
" it, or wait\n");
2028
}
2029
/* the current time */
2030
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2031
if(ret == -1){
2032
perror_plus("clock_gettime");
2033
return -1;
2034
}
2035
/* Calculating in ms how long time between now and server
2036
who we visted longest time ago. Now - last seen. */
2037
waited_time.tv_sec = (now.tv_sec
2038
- mc->current_server->last_seen.tv_sec);
2039
waited_time.tv_nsec = (now.tv_nsec
2040
- mc->current_server->last_seen.tv_nsec);
2041
/* total time is 10s/10,000ms.
2042
Converting to s from ms by dividing by 1,000,
2043
and ns to ms by dividing by 1,000,000. */
2044
block_time = ((retry_interval
2045
- ((intmax_t)waited_time.tv_sec * 1000))
2046
- ((intmax_t)waited_time.tv_nsec / 1000000));
2047
2048
if(debug){
2049
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2050
block_time);
2051
}
2052
2053
if(block_time <= 0){
2054
ret = start_mandos_communication(mc->current_server->ip,
2055
mc->current_server->port,
2056
mc->current_server->if_index,
2057
mc->current_server->af, mc);
2058
if(ret == 0){
2059
avahi_simple_poll_quit(s);
2060
return 0;
2061
}
2062
ret = clock_gettime(CLOCK_MONOTONIC,
2063
&mc->current_server->last_seen);
2064
if(ret == -1){
2065
perror_plus("clock_gettime");
2066
return -1;
2067
}
2068
mc->current_server = mc->current_server->next;
2069
block_time = 0; /* Call avahi to find new Mandos
2070
servers, but don't block */
2071
}
2072
2073
ret = avahi_simple_poll_iterate(s, (int)block_time);
2074
}
2075
if(ret != 0){
2076
if(ret > 0 or errno != EINTR){
2077
return (ret != 1) ? ret : 0;
2078
}
2079
}
2080
}
2081
}
2082
2083
__attribute__((nonnull))
2084
void run_network_hooks(const char *mode, const char *interface,
2085
const float delay){
2086
struct dirent **direntries = NULL;
2087
if(hookdir_fd == -1){
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2089
| O_CLOEXEC);
2090
if(hookdir_fd == -1){
2091
if(errno == ENOENT){
2092
if(debug){
2093
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2094
" found\n", hookdir);
2095
}
2096
} else {
2097
perror_plus("open");
2098
}
2099
return;
2100
}
2101
}
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2103
if(devnull == -1){
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2105
return;
2106
}
2107
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
runnable_hook, alphasort);
2109
if(numhooks == -1){
2110
perror_plus("scandir");
2111
close(devnull);
2112
return;
2113
}
2114
struct dirent *direntry;
2115
int ret;
2116
for(int i = 0; i < numhooks; i++){
2117
direntry = direntries[i];
2118
if(debug){
2119
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2120
direntry->d_name);
2121
}
2122
pid_t hook_pid = fork();
2123
if(hook_pid == 0){
2124
/* Child */
2125
/* Raise privileges */
2126
errno = raise_privileges_permanently();
2127
if(errno != 0){
2128
perror_plus("Failed to raise privileges");
2129
_exit(EX_NOPERM);
2130
}
2131
/* Set group */
2132
errno = 0;
2133
ret = setgid(0);
2134
if(ret == -1){
2135
perror_plus("setgid");
2136
_exit(EX_NOPERM);
2137
}
2138
/* Reset supplementary groups */
2139
errno = 0;
2140
ret = setgroups(0, NULL);
2141
if(ret == -1){
2142
perror_plus("setgroups");
2143
_exit(EX_NOPERM);
2144
}
2145
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2146
if(ret == -1){
2147
perror_plus("setenv");
2148
_exit(EX_OSERR);
2149
}
2150
ret = setenv("DEVICE", interface, 1);
2151
if(ret == -1){
2152
perror_plus("setenv");
2153
_exit(EX_OSERR);
2154
}
2155
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2156
if(ret == -1){
2157
perror_plus("setenv");
2158
_exit(EX_OSERR);
2159
}
2160
ret = setenv("MODE", mode, 1);
2161
if(ret == -1){
2162
perror_plus("setenv");
2163
_exit(EX_OSERR);
2164
}
2165
char *delaystring;
2166
ret = asprintf(&delaystring, "%f", (double)delay);
2167
if(ret == -1){
2168
perror_plus("asprintf");
2169
_exit(EX_OSERR);
2170
}
2171
ret = setenv("DELAY", delaystring, 1);
2172
if(ret == -1){
2173
free(delaystring);
2174
perror_plus("setenv");
2175
_exit(EX_OSERR);
2176
}
2177
free(delaystring);
2178
if(connect_to != NULL){
2179
ret = setenv("CONNECT", connect_to, 1);
2180
if(ret == -1){
2181
perror_plus("setenv");
2182
_exit(EX_OSERR);
2183
}
2184
}
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2186
direntry->d_name,
2187
O_RDONLY));
2188
if(hook_fd == -1){
2189
perror_plus("openat");
2190
_exit(EXIT_FAILURE);
2191
}
2192
if(close(hookdir_fd) == -1){
2193
perror_plus("close");
2194
_exit(EXIT_FAILURE);
2195
}
2196
ret = dup2(devnull, STDIN_FILENO);
2197
if(ret == -1){
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2199
_exit(EX_OSERR);
2200
}
2201
ret = close(devnull);
2202
if(ret == -1){
2203
perror_plus("close");
2204
_exit(EX_OSERR);
2205
}
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2207
if(ret == -1){
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2209
_exit(EX_OSERR);
2210
}
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2212
environ) == -1){
2213
perror_plus("fexecve");
2214
_exit(EXIT_FAILURE);
2215
}
2216
} else {
2217
if(hook_pid == -1){
2218
perror_plus("fork");
2219
free(direntry);
2220
continue;
2221
}
2222
int status;
2223
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2224
perror_plus("waitpid");
2225
free(direntry);
2226
continue;
2227
}
2228
if(WIFEXITED(status)){
2229
if(WEXITSTATUS(status) != 0){
2230
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2231
" with status %d\n", direntry->d_name,
2232
WEXITSTATUS(status));
2233
free(direntry);
2234
continue;
2235
}
2236
} else if(WIFSIGNALED(status)){
2237
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2238
" signal %d\n", direntry->d_name,
2239
WTERMSIG(status));
2240
free(direntry);
2241
continue;
2242
} else {
2243
fprintf_plus(stderr, "Warning: network hook \"%s\""
2244
" crashed\n", direntry->d_name);
2245
free(direntry);
2246
continue;
2247
}
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2251
direntry->d_name);
2252
}
2253
free(direntry);
2254
}
2255
free(direntries);
2256
if(close(hookdir_fd) == -1){
2257
perror_plus("close");
2258
} else {
2259
hookdir_fd = -1;
2260
}
2261
close(devnull);
2262
}
2263
2264
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2266
const float delay){
2267
int old_errno = errno;
2268
int ret;
2269
struct ifreq network;
2270
unsigned int if_index = if_nametoindex(interface);
2271
if(if_index == 0){
2272
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2273
errno = old_errno;
2274
return ENXIO;
2275
}
2276
2277
if(quit_now){
2278
errno = old_errno;
2279
return EINTR;
2280
}
2281
2282
if(not interface_is_up(interface)){
2283
int ret_errno = 0;
2284
int ioctl_errno = 0;
2285
if(not get_flags(interface, &network)){
2286
ret_errno = errno;
2287
fprintf_plus(stderr, "Failed to get flags for interface "
2288
"\"%s\"\n", interface);
2289
errno = old_errno;
2290
return ret_errno;
2291
}
2292
network.ifr_flags |= IFF_UP; /* set flag */
2293
2294
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2295
if(sd == -1){
2296
ret_errno = errno;
2297
perror_plus("socket");
2298
errno = old_errno;
2299
return ret_errno;
2300
}
2301
2302
if(quit_now){
2303
ret = close(sd);
2304
if(ret == -1){
2305
perror_plus("close");
2306
}
2307
errno = old_errno;
2308
return EINTR;
2309
}
2310
2311
if(debug){
2312
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2313
interface);
2314
}
2315
2316
/* Raise privileges */
2317
ret_errno = raise_privileges();
2318
if(ret_errno != 0){
2319
errno = ret_errno;
2320
perror_plus("Failed to raise privileges");
2321
}
2322
2323
#ifdef __linux__
2324
int ret_linux;
2325
bool restore_loglevel = false;
2326
if(ret_errno == 0){
2327
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2328
messages about the network interface to mess up the prompt */
2329
ret_linux = klogctl(8, NULL, 5);
2330
if(ret_linux == -1){
2331
perror_plus("klogctl");
2332
} else {
2333
restore_loglevel = true;
2334
}
2335
}
2336
#endif /* __linux__ */
2337
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2338
ioctl_errno = errno;
2339
#ifdef __linux__
2340
if(restore_loglevel){
2341
ret_linux = klogctl(7, NULL, 0);
2342
if(ret_linux == -1){
2343
perror_plus("klogctl");
2344
}
2345
}
2346
#endif /* __linux__ */
2347
2348
/* If raise_privileges() succeeded above */
2349
if(ret_errno == 0){
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2352
if(ret_errno != 0){
2353
errno = ret_errno;
2354
perror_plus("Failed to lower privileges");
2355
}
2356
}
2357
2358
/* Close the socket */
2359
ret = close(sd);
2360
if(ret == -1){
2361
perror_plus("close");
2362
}
2363
2364
if(ret_setflags == -1){
2365
errno = ioctl_errno;
2366
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2367
errno = old_errno;
2368
return ioctl_errno;
2369
}
2370
} else if(debug){
2371
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2372
interface);
2373
}
2374
2375
/* Sleep checking until interface is running.
2376
Check every 0.25s, up to total time of delay */
2377
for(int i = 0; i < delay * 4; i++){
2378
if(interface_is_running(interface)){
2379
break;
2380
}
2381
struct timespec sleeptime = { .tv_nsec = 250000000 };
2382
ret = nanosleep(&sleeptime, NULL);
2383
if(ret == -1 and errno != EINTR){
2384
perror_plus("nanosleep");
2385
}
2386
}
2387
2388
errno = old_errno;
2389
return 0;
2390
}
2391
2392
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
2395
struct ifreq network;
2396
unsigned int if_index = if_nametoindex(interface);
2397
if(if_index == 0){
2398
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2399
errno = old_errno;
2400
return ENXIO;
2401
}
2402
if(interface_is_up(interface)){
2403
int ret_errno = 0;
2404
int ioctl_errno = 0;
2405
if(not get_flags(interface, &network) and debug){
2406
ret_errno = errno;
2407
fprintf_plus(stderr, "Failed to get flags for interface "
2408
"\"%s\"\n", interface);
2409
errno = old_errno;
2410
return ret_errno;
2411
}
2412
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2413
2414
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2415
if(sd == -1){
2416
ret_errno = errno;
2417
perror_plus("socket");
2418
errno = old_errno;
2419
return ret_errno;
2420
}
2421
2422
if(debug){
2423
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2424
interface);
2425
}
2426
2427
/* Raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
}
2433
2434
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2435
ioctl_errno = errno;
2436
2437
/* If raise_privileges() succeeded above */
2438
if(ret_errno == 0){
2439
/* Lower privileges */
2440
ret_errno = lower_privileges();
2441
if(ret_errno != 0){
2442
errno = ret_errno;
2443
perror_plus("Failed to lower privileges");
2444
}
2445
}
2446
2447
/* Close the socket */
2448
int ret = close(sd);
2449
if(ret == -1){
2450
perror_plus("close");
2451
}
2452
2453
if(ret_setflags == -1){
2454
errno = ioctl_errno;
2455
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2456
errno = old_errno;
2457
return ioctl_errno;
2458
}
2459
} else if(debug){
2460
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2461
interface);
2462
}
2463
2464
errno = old_errno;
2465
return 0;
2466
}
2467
822
2468
int main(int argc, char *argv[]){
823
AvahiSServiceBrowser *sb = NULL;
824
int error;
825
int ret;
826
intmax_t tmpmax;
827
int numchars;
828
int exitcode = EXIT_SUCCESS;
829
const char *interface = "eth0";
830
struct ifreq network;
831
int sd;
832
uid_t uid;
833
gid_t gid;
834
char *connect_to = NULL;
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
837
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
838
const char *seckey = PATHDIR "/" SECKEY;
839
const char *pubkey = PATHDIR "/" PUBKEY;
840
841
mandos_context mc = { .simple_poll = NULL, .server = NULL,
842
.dh_bits = 1024, .priority = "SECURE256"
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
846
double delay = 2.5;
847
848
{
849
struct argp_option options[] = {
850
{ .name = "debug", .key = 128,
851
.doc = "Debug mode", .group = 3 },
852
{ .name = "connect", .key = 'c',
853
.arg = "ADDRESS:PORT",
854
.doc = "Connect directly to a specific Mandos server",
855
.group = 1 },
856
{ .name = "interface", .key = 'i',
857
.arg = "NAME",
858
.doc = "Interface that will be used to search for Mandos"
859
" servers",
860
.group = 1 },
861
{ .name = "seckey", .key = 's',
862
.arg = "FILE",
863
.doc = "OpenPGP secret key file base name",
864
.group = 1 },
865
{ .name = "pubkey", .key = 'p',
866
.arg = "FILE",
867
.doc = "OpenPGP public key file base name",
868
.group = 2 },
869
{ .name = "dh-bits", .key = 129,
870
.arg = "BITS",
871
.doc = "Bit length of the prime number used in the"
872
" Diffie-Hellman key exchange",
873
.group = 2 },
874
{ .name = "priority", .key = 130,
875
.arg = "STRING",
876
.doc = "GnuTLS priority string for the TLS handshake",
877
.group = 1 },
878
{ .name = "delay", .key = 131,
879
.arg = "SECONDS",
880
.doc = "Maximum delay to wait for interface startup",
881
.group = 2 },
882
{ .name = NULL }
883
};
884
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
887
switch(key) {
888
case 128: /* --debug */
889
debug = true;
890
break;
891
case 'c': /* --connect */
892
connect_to = arg;
893
break;
894
case 'i': /* --interface */
895
interface = arg;
896
break;
897
case 's': /* --seckey */
898
seckey = arg;
899
break;
900
case 'p': /* --pubkey */
901
pubkey = arg;
902
break;
903
case 129: /* --dh-bits */
904
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
905
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
906
or arg[numchars] != '\0'){
907
fprintf(stderr, "Bad number of DH bits\n");
908
exit(EXIT_FAILURE);
909
}
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
911
break;
912
case 130: /* --priority */
913
mc.priority = arg;
914
break;
915
case 131: /* --delay */
916
ret = sscanf(arg, "%lf%n", &delay, &numchars);
917
if(ret < 1 or arg[numchars] != '\0'){
918
fprintf(stderr, "Bad delay\n");
919
exit(EXIT_FAILURE);
920
}
921
break;
922
case ARGP_KEY_ARG:
923
argp_usage(state);
924
case ARGP_KEY_END:
925
break;
926
default:
927
return ARGP_ERR_UNKNOWN;
928
}
929
return 0;
930
}
931
932
struct argp argp = { .options = options, .parser = parse_opt,
933
.args_doc = "",
934
.doc = "Mandos client -- Get and decrypt"
935
" passwords from a Mandos server" };
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
938
fprintf(stderr, "Unknown error while parsing arguments\n");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
947
messages to mess up the prompt */
948
ret = klogctl(8, NULL, 5);
949
if(ret == -1){
950
perror("klogctl");
951
}
952
953
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
954
if(sd < 0) {
955
perror("socket");
956
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
958
if(ret == -1){
959
perror("klogctl");
960
}
961
goto end;
962
}
963
strcpy(network.ifr_name, interface);
964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
965
if(ret == -1){
966
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
968
if(ret == -1){
969
perror("klogctl");
970
}
971
exitcode = EXIT_FAILURE;
972
goto end;
973
}
974
if((network.ifr_flags & IFF_UP) == 0){
975
network.ifr_flags |= IFF_UP;
976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
977
if(ret == -1){
978
perror("ioctl SIOCSIFFLAGS");
979
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
981
if(ret == -1){
982
perror("klogctl");
983
}
984
goto end;
985
}
986
}
987
/* sleep checking until interface is running */
988
for(int i=0; i < delay * 4; i++){
989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
990
if(ret == -1){
991
perror("ioctl SIOCGIFFLAGS");
992
} else if(network.ifr_flags & IFF_RUNNING){
993
break;
994
}
995
struct timespec sleeptime = { .tv_nsec = 250000000 };
996
nanosleep(&sleeptime, NULL);
997
}
998
ret = (int)TEMP_FAILURE_RETRY(close(sd));
999
if(ret == -1){
1000
perror("close");
1001
}
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1004
if(ret == -1){
1005
perror("klogctl");
1006
}
1007
}
1008
1009
uid = getuid();
1010
gid = getgid();
1011
1012
setgid(gid);
1013
if(ret == -1){
1014
perror("setgid");
1015
}
1016
1017
ret = setuid(uid);
1018
if(ret == -1){
1019
perror("setuid");
1020
}
1021
1022
ret = init_gnutls_global(&mc, pubkey, seckey);
1023
if(ret == -1){
1024
fprintf(stderr, "init_gnutls_global failed\n");
1025
exitcode = EXIT_FAILURE;
1026
goto end;
1027
} else {
1028
gnutls_initialized = true;
1029
}
1030
1031
if(mkdtemp(tempdir) == NULL){
1032
perror("mkdtemp");
1033
goto end;
1034
}
1035
tempdir_created = true;
1036
1037
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1038
fprintf(stderr, "init_gpgme failed\n");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
} else {
1042
gpgme_initialized = true;
1043
}
1044
1045
if_index = (AvahiIfIndex) if_nametoindex(interface);
1046
if(if_index == 0){
1047
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1048
exitcode = EXIT_FAILURE;
1049
goto end;
1050
}
1051
1052
if(connect_to != NULL){
1053
/* Connect directly, do not use Zeroconf */
1054
/* (Mainly meant for debugging) */
1055
char *address = strrchr(connect_to, ':');
1056
if(address == NULL){
1057
fprintf(stderr, "No colon in address\n");
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
uint16_t port;
1062
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1063
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1064
or address[numchars+1] != '\0'){
1065
fprintf(stderr, "Bad port number\n");
1066
exitcode = EXIT_FAILURE;
1067
goto end;
1068
}
1069
port = (uint16_t)tmpmax;
1070
*address = '\0';
1071
address = connect_to;
1072
ret = start_mandos_communication(address, port, if_index, &mc);
1073
if(ret < 0){
1074
exitcode = EXIT_FAILURE;
1075
} else {
1076
exitcode = EXIT_SUCCESS;
1077
}
1078
goto end;
1079
}
1080
1081
if(not debug){
1082
avahi_set_log_function(empty_log);
1083
}
1084
1085
/* Initialize the pseudo-RNG for Avahi */
1086
srand((unsigned int) time(NULL));
1087
1088
/* Allocate main Avahi loop object */
1089
mc.simple_poll = avahi_simple_poll_new();
1090
if(mc.simple_poll == NULL) {
1091
fprintf(stderr, "Avahi: Failed to create simple poll"
1092
" object.\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1095
}
1096
1097
{
1098
AvahiServerConfig config;
1099
/* Do not publish any local Zeroconf records */
1100
avahi_server_config_init(&config);
1101
config.publish_hinfo = 0;
1102
config.publish_addresses = 0;
1103
config.publish_workstation = 0;
1104
config.publish_domain = 0;
1105
1106
/* Allocate a new server */
1107
mc.server = avahi_server_new(avahi_simple_poll_get
1108
(mc.simple_poll), &config, NULL,
1109
NULL, &error);
1110
1111
/* Free the Avahi configuration data */
1112
avahi_server_config_free(&config);
1113
}
1114
1115
/* Check if creating the Avahi server object succeeded */
1116
if(mc.server == NULL) {
1117
fprintf(stderr, "Failed to create Avahi server: %s\n",
1118
avahi_strerror(error));
1119
exitcode = EXIT_FAILURE;
1120
goto end;
1121
}
1122
1123
/* Create the Avahi service browser */
1124
sb = avahi_s_service_browser_new(mc.server, if_index,
1125
AVAHI_PROTO_INET6,
1126
"_mandos._tcp", NULL, 0,
1127
browse_callback, &mc);
1128
if(sb == NULL) {
1129
fprintf(stderr, "Failed to create service browser: %s\n",
1130
avahi_strerror(avahi_server_errno(mc.server)));
1131
exitcode = EXIT_FAILURE;
1132
goto end;
1133
}
1134
1135
/* Run the main loop */
1136
2469
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2473
":%PROFILE_ULTRA",
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2477
#else
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2479
#endif
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
2482
AvahiSServiceBrowser *sb = NULL;
2483
error_t ret_errno;
2484
int ret;
2485
intmax_t tmpmax;
2486
char *tmp;
2487
int exitcode = EXIT_SUCCESS;
2488
char *interfaces_to_take_down = NULL;
2489
size_t interfaces_to_take_down_size = 0;
2490
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2491
char old_tempdir[] = "/tmp/mandosXXXXXX";
2492
char *tempdir = NULL;
2493
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
const char *seckey = PATHDIR "/" SECKEY;
2495
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2499
#endif
2500
const char *dh_params_file = NULL;
2501
char *interfaces_hooks = NULL;
2502
2503
bool gnutls_initialized = false;
2504
bool gpgme_initialized = false;
2505
float delay = 2.5f;
2506
double retry_interval = 10; /* 10s between trying a server and
2507
retrying the same server again */
2508
2509
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2510
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2511
2512
uid = getuid();
2513
gid = getgid();
2514
2515
/* Lower any group privileges we might have, just to be safe */
2516
errno = 0;
2517
ret = setgid(gid);
2518
if(ret == -1){
2519
perror_plus("setgid");
2520
}
2521
2522
/* Lower user privileges (temporarily) */
2523
errno = 0;
2524
ret = seteuid(uid);
2525
if(ret == -1){
2526
perror_plus("seteuid");
2527
}
2528
2529
if(quit_now){
2530
goto end;
2531
}
2532
2533
{
2534
struct argp_option options[] = {
2535
{ .name = "debug", .key = 128,
2536
.doc = "Debug mode", .group = 3 },
2537
{ .name = "connect", .key = 'c',
2538
.arg = "ADDRESS:PORT",
2539
.doc = "Connect directly to a specific Mandos server",
2540
.group = 1 },
2541
{ .name = "interface", .key = 'i',
2542
.arg = "NAME",
2543
.doc = "Network interface that will be used to search for"
2544
" Mandos servers",
2545
.group = 1 },
2546
{ .name = "seckey", .key = 's',
2547
.arg = "FILE",
2548
.doc = "OpenPGP secret key file base name",
2549
.group = 1 },
2550
{ .name = "pubkey", .key = 'p',
2551
.arg = "FILE",
2552
.doc = "OpenPGP public key file base name",
2553
.group = 1 },
2554
{ .name = "tls-privkey", .key = 't',
2555
.arg = "FILE",
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2558
#else
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2560
#endif
2561
.group = 1 },
2562
{ .name = "tls-pubkey", .key = 'T',
2563
.arg = "FILE",
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2566
#else
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2568
#endif
2569
.group = 1 },
2570
{ .name = "dh-bits", .key = 129,
2571
.arg = "BITS",
2572
.doc = "Bit length of the prime number used in the"
2573
" Diffie-Hellman key exchange",
2574
.group = 2 },
2575
{ .name = "dh-params", .key = 134,
2576
.arg = "FILE",
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2579
.group = 2 },
2580
{ .name = "priority", .key = 130,
2581
.arg = "STRING",
2582
.doc = "GnuTLS priority string for the TLS handshake",
2583
.group = 1 },
2584
{ .name = "delay", .key = 131,
2585
.arg = "SECONDS",
2586
.doc = "Maximum delay to wait for interface startup",
2587
.group = 2 },
2588
{ .name = "retry", .key = 132,
2589
.arg = "SECONDS",
2590
.doc = "Retry interval used when denied by the Mandos server",
2591
.group = 2 },
2592
{ .name = "network-hook-dir", .key = 133,
2593
.arg = "DIR",
2594
.doc = "Directory where network hooks are located",
2595
.group = 2 },
2596
/*
2597
* These reproduce what we would get without ARGP_NO_HELP
2598
*/
2599
{ .name = "help", .key = '?',
2600
.doc = "Give this help list", .group = -1 },
2601
{ .name = "usage", .key = -3,
2602
.doc = "Give a short usage message", .group = -1 },
2603
{ .name = "version", .key = 'V',
2604
.doc = "Print program version", .group = -1 },
2605
{ .name = NULL }
2606
};
2607
2608
error_t parse_opt(int key, char *arg,
2609
struct argp_state *state){
2610
errno = 0;
2611
switch(key){
2612
case 128: /* --debug */
2613
debug = true;
2614
break;
2615
case 'c': /* --connect */
2616
connect_to = arg;
2617
break;
2618
case 'i': /* --interface */
2619
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2620
arg, (int)',');
2621
if(ret_errno != 0){
2622
argp_error(state, "%s", strerror(ret_errno));
2623
}
2624
break;
2625
case 's': /* --seckey */
2626
seckey = arg;
2627
break;
2628
case 'p': /* --pubkey */
2629
pubkey = arg;
2630
break;
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2633
tls_privkey = arg;
2634
#endif
2635
break;
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2638
tls_pubkey = arg;
2639
#endif
2640
break;
2641
case 129: /* --dh-bits */
2642
errno = 0;
2643
tmpmax = strtoimax(arg, &tmp, 10);
2644
if(errno != 0 or tmp == arg or *tmp != '\0'
2645
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2646
argp_error(state, "Bad number of DH bits");
2647
}
2648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2649
break;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2652
break;
2653
case 130: /* --priority */
2654
mc.priority = arg;
2655
break;
2656
case 131: /* --delay */
2657
errno = 0;
2658
delay = strtof(arg, &tmp);
2659
if(errno != 0 or tmp == arg or *tmp != '\0'){
2660
argp_error(state, "Bad delay");
2661
}
2662
case 132: /* --retry */
2663
errno = 0;
2664
retry_interval = strtod(arg, &tmp);
2665
if(errno != 0 or tmp == arg or *tmp != '\0'
2666
or (retry_interval * 1000) > INT_MAX
2667
or retry_interval < 0){
2668
argp_error(state, "Bad retry interval");
2669
}
2670
break;
2671
case 133: /* --network-hook-dir */
2672
hookdir = arg;
2673
break;
2674
/*
2675
* These reproduce what we would get without ARGP_NO_HELP
2676
*/
2677
case '?': /* --help */
2678
argp_state_help(state, state->out_stream,
2679
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
case -3: /* --usage */
2683
argp_state_help(state, state->out_stream,
2684
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
case 'V': /* --version */
2687
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
exit(argp_err_exit_status);
2689
break;
2690
default:
2691
return ARGP_ERR_UNKNOWN;
2692
}
2693
return errno;
2694
}
2695
2696
struct argp argp = { .options = options, .parser = parse_opt,
2697
.args_doc = "",
2698
.doc = "Mandos client -- Get and decrypt"
2699
" passwords from a Mandos server" };
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2702
switch(ret_errno){
2703
case 0:
2704
break;
2705
case ENOMEM:
2706
default:
2707
errno = ret_errno;
2708
perror_plus("argp_parse");
2709
exitcode = EX_OSERR;
2710
goto end;
2711
case EINVAL:
2712
exitcode = EX_USAGE;
2713
goto end;
2714
}
2715
}
2716
2717
{
2718
/* Re-raise privileges */
2719
ret = raise_privileges();
2720
if(ret != 0){
2721
errno = ret;
2722
perror_plus("Failed to raise privileges");
2723
} else {
2724
struct stat st;
2725
2726
/* Work around Debian bug #633582:
2727
<https://bugs.debian.org/633582> */
2728
2729
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2730
int seckey_fd = open(seckey, O_RDONLY);
2731
if(seckey_fd == -1){
2732
perror_plus("open");
2733
} else {
2734
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2735
if(ret == -1){
2736
perror_plus("fstat");
2737
} else {
2738
if(S_ISREG(st.st_mode)
2739
and st.st_uid == 0 and st.st_gid == 0){
2740
ret = fchown(seckey_fd, uid, gid);
2741
if(ret == -1){
2742
perror_plus("fchown");
2743
}
2744
}
2745
}
2746
close(seckey_fd);
2747
}
2748
}
2749
2750
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2751
int pubkey_fd = open(pubkey, O_RDONLY);
2752
if(pubkey_fd == -1){
2753
perror_plus("open");
2754
} else {
2755
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2756
if(ret == -1){
2757
perror_plus("fstat");
2758
} else {
2759
if(S_ISREG(st.st_mode)
2760
and st.st_uid == 0 and st.st_gid == 0){
2761
ret = fchown(pubkey_fd, uid, gid);
2762
if(ret == -1){
2763
perror_plus("fchown");
2764
}
2765
}
2766
}
2767
close(pubkey_fd);
2768
}
2769
}
2770
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2776
} else {
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2778
if(ret == -1){
2779
perror_plus("fstat");
2780
} else {
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2784
if(ret == -1){
2785
perror_plus("fchown");
2786
}
2787
}
2788
}
2789
close(dhparams_fd);
2790
}
2791
}
2792
2793
/* Work around Debian bug #981302
2794
<https://bugs.debian.org/981302> */
2795
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2796
ret = symlink("/proc/self/fd", "/dev/fd");
2797
if(ret == -1){
2798
perror_plus("Failed to create /dev/fd symlink");
2799
}
2800
}
2801
2802
/* Lower privileges */
2803
ret = lower_privileges();
2804
if(ret != 0){
2805
errno = ret;
2806
perror_plus("Failed to lower privileges");
2807
}
2808
}
2809
}
2810
2811
/* Remove invalid interface names (except "none") */
2812
{
2813
char *interface = NULL;
2814
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2815
interface))){
2816
if(strcmp(interface, "none") != 0
2817
and if_nametoindex(interface) == 0){
2818
if(interface[0] != '\0'){
2819
fprintf_plus(stderr, "Not using nonexisting interface"
2820
" \"%s\"\n", interface);
2821
}
2822
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2823
interface = NULL;
2824
}
2825
}
2826
}
2827
2828
/* Run network hooks */
2829
{
2830
if(mc.interfaces != NULL){
2831
interfaces_hooks = malloc(mc.interfaces_size);
2832
if(interfaces_hooks == NULL){
2833
perror_plus("malloc");
2834
goto end;
2835
}
2836
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2837
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2838
}
2839
run_network_hooks("start", interfaces_hooks != NULL ?
2840
interfaces_hooks : "", delay);
2841
}
2842
2843
if(not debug){
2844
avahi_set_log_function(empty_log);
2845
}
2846
2847
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2848
from the signal handler */
2849
/* Initialize the pseudo-RNG for Avahi */
2850
srand((unsigned int) time(NULL));
2851
simple_poll = avahi_simple_poll_new();
2852
if(simple_poll == NULL){
2853
fprintf_plus(stderr,
2854
"Avahi: Failed to create simple poll object.\n");
2855
exitcode = EX_UNAVAILABLE;
2856
goto end;
2857
}
2858
2859
sigemptyset(&sigterm_action.sa_mask);
2860
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2861
if(ret == -1){
2862
perror_plus("sigaddset");
2863
exitcode = EX_OSERR;
2864
goto end;
2865
}
2866
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2867
if(ret == -1){
2868
perror_plus("sigaddset");
2869
exitcode = EX_OSERR;
2870
goto end;
2871
}
2872
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2873
if(ret == -1){
2874
perror_plus("sigaddset");
2875
exitcode = EX_OSERR;
2876
goto end;
2877
}
2878
/* Need to check if the handler is SIG_IGN before handling:
2879
| [[info:libc:Initial Signal Actions]] |
2880
| [[info:libc:Basic Signal Handling]] |
2881
*/
2882
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2883
if(ret == -1){
2884
perror_plus("sigaction");
2885
return EX_OSERR;
2886
}
2887
if(old_sigterm_action.sa_handler != SIG_IGN){
2888
ret = sigaction(SIGINT, &sigterm_action, NULL);
2889
if(ret == -1){
2890
perror_plus("sigaction");
2891
exitcode = EX_OSERR;
2892
goto end;
2893
}
2894
}
2895
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2896
if(ret == -1){
2897
perror_plus("sigaction");
2898
return EX_OSERR;
2899
}
2900
if(old_sigterm_action.sa_handler != SIG_IGN){
2901
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2902
if(ret == -1){
2903
perror_plus("sigaction");
2904
exitcode = EX_OSERR;
2905
goto end;
2906
}
2907
}
2908
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2909
if(ret == -1){
2910
perror_plus("sigaction");
2911
return EX_OSERR;
2912
}
2913
if(old_sigterm_action.sa_handler != SIG_IGN){
2914
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2915
if(ret == -1){
2916
perror_plus("sigaction");
2917
exitcode = EX_OSERR;
2918
goto end;
2919
}
2920
}
2921
2922
/* If no interfaces were specified, make a list */
2923
if(mc.interfaces == NULL){
2924
struct dirent **direntries = NULL;
2925
/* Look for any good interfaces */
2926
ret = scandir(sys_class_net, &direntries, good_interface,
2927
alphasort);
2928
if(ret >= 1){
2929
/* Add all found interfaces to interfaces list */
2930
for(int i = 0; i < ret; ++i){
2931
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2932
direntries[i]->d_name);
2933
if(ret_errno != 0){
2934
errno = ret_errno;
2935
perror_plus("argz_add");
2936
free(direntries[i]);
2937
continue;
2938
}
2939
if(debug){
2940
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2941
direntries[i]->d_name);
2942
}
2943
free(direntries[i]);
2944
}
2945
free(direntries);
2946
} else {
2947
if(ret == 0){
2948
free(direntries);
2949
}
2950
fprintf_plus(stderr, "Could not find a network interface\n");
2951
exitcode = EXIT_FAILURE;
2952
goto end;
2953
}
2954
}
2955
2956
/* Bring up interfaces which are down, and remove any "none"s */
2957
{
2958
char *interface = NULL;
2959
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2960
interface))){
2961
/* If interface name is "none", stop bringing up interfaces.
2962
Also remove all instances of "none" from the list */
2963
if(strcmp(interface, "none") == 0){
2964
argz_delete(&mc.interfaces, &mc.interfaces_size,
2965
interface);
2966
interface = NULL;
2967
while((interface = argz_next(mc.interfaces,
2968
mc.interfaces_size, interface))){
2969
if(strcmp(interface, "none") == 0){
2970
argz_delete(&mc.interfaces, &mc.interfaces_size,
2971
interface);
2972
interface = NULL;
2973
}
2974
}
2975
break;
2976
}
2977
bool interface_was_up = interface_is_up(interface);
2978
errno = bring_up_interface(interface, delay);
2979
if(not interface_was_up){
2980
if(errno != 0){
2981
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2982
" %s\n", interface, strerror(errno));
2983
} else {
2984
errno = argz_add(&interfaces_to_take_down,
2985
&interfaces_to_take_down_size,
2986
interface);
2987
if(errno != 0){
2988
perror_plus("argz_add");
2989
}
2990
}
2991
}
2992
}
2993
if(debug and (interfaces_to_take_down == NULL)){
2994
fprintf_plus(stderr, "No interfaces were brought up\n");
2995
}
2996
}
2997
2998
/* If we only got one interface, explicitly use only that one */
2999
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
1137
3000
if(debug){
1138
fprintf(stderr, "Starting Avahi loop search\n");
1139
}
1140
1141
avahi_simple_poll_loop(mc.simple_poll);
1142
3001
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3002
mc.interfaces);
3003
}
3004
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3005
}
3006
3007
if(quit_now){
3008
goto end;
3009
}
3010
3011
#if GNUTLS_VERSION_NUMBER >= 0x030606
3012
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3013
#elif GNUTLS_VERSION_NUMBER < 0x030600
3014
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3015
#else
3016
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3017
#endif
3018
if(ret == -1){
3019
fprintf_plus(stderr, "init_gnutls_global failed\n");
3020
exitcode = EX_UNAVAILABLE;
3021
goto end;
3022
} else {
3023
gnutls_initialized = true;
3024
}
3025
3026
if(quit_now){
3027
goto end;
3028
}
3029
3030
/* Try /run/tmp before /tmp */
3031
tempdir = mkdtemp(run_tempdir);
3032
if(tempdir == NULL and errno == ENOENT){
3033
if(debug){
3034
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3035
run_tempdir, old_tempdir);
3036
}
3037
tempdir = mkdtemp(old_tempdir);
3038
}
3039
if(tempdir == NULL){
3040
perror_plus("mkdtemp");
3041
goto end;
3042
}
3043
3044
if(quit_now){
3045
goto end;
3046
}
3047
3048
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3049
fprintf_plus(stderr, "init_gpgme failed\n");
3050
exitcode = EX_UNAVAILABLE;
3051
goto end;
3052
} else {
3053
gpgme_initialized = true;
3054
}
3055
3056
if(quit_now){
3057
goto end;
3058
}
3059
3060
if(connect_to != NULL){
3061
/* Connect directly, do not use Zeroconf */
3062
/* (Mainly meant for debugging) */
3063
char *address = strrchr(connect_to, ':');
3064
3065
if(address == NULL){
3066
fprintf_plus(stderr, "No colon in address\n");
3067
exitcode = EX_USAGE;
3068
goto end;
3069
}
3070
3071
if(quit_now){
3072
goto end;
3073
}
3074
3075
in_port_t port;
3076
errno = 0;
3077
tmpmax = strtoimax(address+1, &tmp, 10);
3078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3079
or tmpmax != (in_port_t)tmpmax){
3080
fprintf_plus(stderr, "Bad port number\n");
3081
exitcode = EX_USAGE;
3082
goto end;
3083
}
3084
3085
if(quit_now){
3086
goto end;
3087
}
3088
3089
port = (in_port_t)tmpmax;
3090
*address = '\0';
3091
/* Colon in address indicates IPv6 */
3092
int af;
3093
if(strchr(connect_to, ':') != NULL){
3094
af = AF_INET6;
3095
/* Accept [] around IPv6 address - see RFC 5952 */
3096
if(connect_to[0] == '[' and address[-1] == ']')
3097
{
3098
connect_to++;
3099
address[-1] = '\0';
3100
}
3101
} else {
3102
af = AF_INET;
3103
}
3104
address = connect_to;
3105
3106
if(quit_now){
3107
goto end;
3108
}
3109
3110
while(not quit_now){
3111
ret = start_mandos_communication(address, port, if_index, af,
3112
&mc);
3113
if(quit_now or ret == 0){
3114
break;
3115
}
3116
if(debug){
3117
fprintf_plus(stderr, "Retrying in %d seconds\n",
3118
(int)retry_interval);
3119
}
3120
sleep((unsigned int)retry_interval);
3121
}
3122
3123
if(not quit_now){
3124
exitcode = EXIT_SUCCESS;
3125
}
3126
3127
goto end;
3128
}
3129
3130
if(quit_now){
3131
goto end;
3132
}
3133
3134
{
3135
AvahiServerConfig config;
3136
/* Do not publish any local Zeroconf records */
3137
avahi_server_config_init(&config);
3138
config.publish_hinfo = 0;
3139
config.publish_addresses = 0;
3140
config.publish_workstation = 0;
3141
config.publish_domain = 0;
3142
3143
/* Allocate a new server */
3144
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3145
&config, NULL, NULL, &ret);
3146
3147
/* Free the Avahi configuration data */
3148
avahi_server_config_free(&config);
3149
}
3150
3151
/* Check if creating the Avahi server object succeeded */
3152
if(mc.server == NULL){
3153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3154
avahi_strerror(ret));
3155
exitcode = EX_UNAVAILABLE;
3156
goto end;
3157
}
3158
3159
if(quit_now){
3160
goto end;
3161
}
3162
3163
/* Create the Avahi service browser */
3164
sb = avahi_s_service_browser_new(mc.server, if_index,
3165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3166
NULL, 0, browse_callback,
3167
(void *)&mc);
3168
if(sb == NULL){
3169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3170
avahi_strerror(avahi_server_errno(mc.server)));
3171
exitcode = EX_UNAVAILABLE;
3172
goto end;
3173
}
3174
3175
if(quit_now){
3176
goto end;
3177
}
3178
3179
/* Run the main loop */
3180
3181
if(debug){
3182
fprintf_plus(stderr, "Starting Avahi loop search\n");
3183
}
3184
3185
ret = avahi_loop_with_timeout(simple_poll,
3186
(int)(retry_interval * 1000), &mc);
3187
if(debug){
3188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3189
(ret == 0) ? "successfully" : "with error");
3190
}
3191
1143
3192
end:
1144
1145
if(debug){
1146
fprintf(stderr, "%s exiting\n", argv[0]);
1147
}
1148
1149
/* Cleanup things */
1150
if(sb != NULL)
1151
avahi_s_service_browser_free(sb);
1152
1153
if(mc.server != NULL)
1154
avahi_server_free(mc.server);
1155
1156
if(mc.simple_poll != NULL)
1157
avahi_simple_poll_free(mc.simple_poll);
1158
1159
if(gnutls_initialized){
1160
gnutls_certificate_free_credentials(mc.cred);
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1163
}
1164
1165
if(gpgme_initialized){
1166
gpgme_release(mc.ctx);
1167
}
1168
1169
/* Removes the temp directory used by GPGME */
1170
if(tempdir_created){
1171
DIR *d;
1172
struct dirent *direntry;
1173
d = opendir(tempdir);
1174
if(d == NULL){
1175
if(errno != ENOENT){
1176
perror("opendir");
1177
}
1178
} else {
1179
while(true){
1180
direntry = readdir(d);
1181
if(direntry == NULL){
1182
break;
1183
}
1184
/* Skip "." and ".." */
1185
if(direntry->d_name[0] == '.'
1186
and (direntry->d_name[1] == '\0'
1187
or (direntry->d_name[1] == '.'
1188
and direntry->d_name[2] == '\0'))){
1189
continue;
1190
}
1191
char *fullname = NULL;
1192
ret = asprintf(&fullname, "%s/%s", tempdir,
1193
direntry->d_name);
1194
if(ret < 0){
1195
perror("asprintf");
1196
continue;
1197
}
1198
ret = remove(fullname);
1199
if(ret == -1){
1200
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1201
strerror(errno));
1202
}
1203
free(fullname);
1204
}
1205
closedir(d);
1206
}
1207
ret = rmdir(tempdir);
1208
if(ret == -1 and errno != ENOENT){
1209
perror("rmdir");
1210
}
1211
}
1212
1213
return exitcode;
3193
3194
if(debug){
3195
if(signal_received){
3196
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3197
argv[0], signal_received,
3198
strsignal(signal_received));
3199
} else {
3200
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3201
}
3202
}
3203
3204
/* Cleanup things */
3205
free(mc.interfaces);
3206
3207
if(sb != NULL)
3208
avahi_s_service_browser_free(sb);
3209
3210
if(mc.server != NULL)
3211
avahi_server_free(mc.server);
3212
3213
if(simple_poll != NULL)
3214
avahi_simple_poll_free(simple_poll);
3215
3216
if(gnutls_initialized){
3217
gnutls_certificate_free_credentials(mc.cred);
3218
gnutls_dh_params_deinit(mc.dh_params);
3219
}
3220
3221
if(gpgme_initialized){
3222
gpgme_release(mc.ctx);
3223
}
3224
3225
/* Cleans up the circular linked list of Mandos servers the client
3226
has seen */
3227
if(mc.current_server != NULL){
3228
mc.current_server->prev->next = NULL;
3229
while(mc.current_server != NULL){
3230
server *next = mc.current_server->next;
3231
#ifdef __GNUC__
3232
#pragma GCC diagnostic push
3233
#pragma GCC diagnostic ignored "-Wcast-qual"
3234
#endif
3235
free((char *)(mc.current_server->ip));
3236
#ifdef __GNUC__
3237
#pragma GCC diagnostic pop
3238
#endif
3239
free(mc.current_server);
3240
mc.current_server = next;
3241
}
3242
}
3243
3244
/* Re-raise privileges */
3245
{
3246
ret = raise_privileges();
3247
if(ret != 0){
3248
errno = ret;
3249
perror_plus("Failed to raise privileges");
3250
} else {
3251
3252
/* Run network hooks */
3253
run_network_hooks("stop", interfaces_hooks != NULL ?
3254
interfaces_hooks : "", delay);
3255
3256
/* Take down the network interfaces which were brought up */
3257
{
3258
char *interface = NULL;
3259
while((interface = argz_next(interfaces_to_take_down,
3260
interfaces_to_take_down_size,
3261
interface))){
3262
ret = take_down_interface(interface);
3263
if(ret != 0){
3264
errno = ret;
3265
perror_plus("Failed to take down interface");
3266
}
3267
}
3268
if(debug and (interfaces_to_take_down == NULL)){
3269
fprintf_plus(stderr, "No interfaces needed to be taken"
3270
" down\n");
3271
}
3272
}
3273
}
3274
3275
ret = lower_privileges_permanently();
3276
if(ret != 0){
3277
errno = ret;
3278
perror_plus("Failed to lower privileges permanently");
3279
}
3280
}
3281
3282
free(interfaces_to_take_down);
3283
free(interfaces_hooks);
3284
3285
void clean_dir_at(int base, const char * const dirname,
3286
uintmax_t level){
3287
struct dirent **direntries = NULL;
3288
int dret;
3289
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3290
O_RDONLY
3291
| O_NOFOLLOW
3292
| O_DIRECTORY
3293
| O_PATH));
3294
if(dir_fd == -1){
3295
perror_plus("open");
3296
return;
3297
}
3298
int numentries = scandirat(dir_fd, ".", &direntries,
3299
notdotentries, alphasort);
3300
if(numentries >= 0){
3301
for(int i = 0; i < numentries; i++){
3302
if(debug){
3303
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3304
dirname, direntries[i]->d_name);
3305
}
3306
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3307
if(dret == -1){
3308
if(errno == EISDIR){
3309
dret = unlinkat(dir_fd, direntries[i]->d_name,
3310
AT_REMOVEDIR);
3311
}
3312
if((dret == -1) and (errno == ENOTEMPTY)
3313
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3314
== 0) and (level == 0)){
3315
/* Recurse only in this special case */
3316
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3317
dret = 0;
3318
}
3319
if((dret == -1) and (errno != ENOENT)){
3320
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3321
direntries[i]->d_name, strerror(errno));
3322
}
3323
}
3324
free(direntries[i]);
3325
}
3326
3327
/* need to clean even if 0 because man page doesn't specify */
3328
free(direntries);
3329
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3330
if(dret == -1 and errno != ENOENT){
3331
perror_plus("rmdir");
3332
}
3333
} else {
3334
perror_plus("scandirat");
3335
}
3336
close(dir_fd);
3337
}
3338
3339
/* Removes the GPGME temp directory and all files inside */
3340
if(tempdir != NULL){
3341
clean_dir_at(-1, tempdir, 0);
3342
}
3343
3344
if(quit_now){
3345
sigemptyset(&old_sigterm_action.sa_mask);
3346
old_sigterm_action.sa_handler = SIG_DFL;
3347
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3348
&old_sigterm_action,
3349
NULL));
3350
if(ret == -1){
3351
perror_plus("sigaction");
3352
}
3353
do {
3354
ret = raise(signal_received);
3355
} while(ret != 0 and errno == EINTR);
3356
if(ret != 0){
3357
perror_plus("raise");
3358
abort();
3359
}
3360
TEMP_FAILURE_RETRY(pause());
3361
}
3362
3363
return exitcode;
1214
3364
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0