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- Committer: Teddy Hogeborn
- Date: 2009-09-16 23:28:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090916232839-3o7i8qmcdcz5j1ya
* init.d-mandos (Required-Start, Required-Stop): Bug fix: Added
"$syslog", thanks to Petter Reinholdtsen
<pere@hungry.com> (Debian bug #546928).
* initramfs-tools-script: Removed erroneous comment.
* plugins.d/askpass-fifo.c: Removed TEMP_FAILURE_RETRY since it is
not needed.
* plugins.d/mandos-client.c (main): Bug fix: Initialize
"old_sigterm_action".
* plugins.d/splashy.c (main): Bug fix: really check return value from
"sigaddset". Fix some warnings on
64-bit systems.
* plugins.d/usplash.c (termination_handler, main): Save received
signal and
re-raise it on
exit.
(usplash_write): Do not close FIFO, instead, take an additional file
descriptor pointer to it and open only when needed
(all callers changed). Abort immediately on EINTR.
Bug fix: Add NUL byte on single-word commands.
Ignore "interrupted_by_signal".
(makeprompt, find_usplash): New; broken out from "main()".
(find_usplash): Bug fix: close /proc/<pid>/cmdline FD on error.
(main): Reorganized to jump to a new "failure" label on any error.
Bug fix: check return values from sigaddset.
New variable "usplash_accessed" to flag if usplash(8) needs
to be killed and restarted. Removed the "an_error_occured"
variable.
"$syslog", thanks to Petter Reinholdtsen
<pere@hungry.com> (Debian bug #546928).
* initramfs-tools-script: Removed erroneous comment.
* plugins.d/askpass-fifo.c: Removed TEMP_FAILURE_RETRY since it is
not needed.
* plugins.d/mandos-client.c (main): Bug fix: Initialize
"old_sigterm_action".
* plugins.d/splashy.c (main): Bug fix: really check return value from
"sigaddset". Fix some warnings on
64-bit systems.
* plugins.d/usplash.c (termination_handler, main): Save received
signal and
re-raise it on
exit.
(usplash_write): Do not close FIFO, instead, take an additional file
descriptor pointer to it and open only when needed
(all callers changed). Abort immediately on EINTR.
Bug fix: Add NUL byte on single-word commands.
Ignore "interrupted_by_signal".
(makeprompt, find_usplash): New; broken out from "main()".
(find_usplash): Bug fix: close /proc/<pid>/cmdline FD on error.
(main): Reorganized to jump to a new "failure" label on any error.
Bug fix: check return values from sigaddset.
New variable "usplash_accessed" to flag if usplash(8) needs
to be killed and restarted. Removed the "an_error_occured"
variable.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
14
*
15
* This file is part of Mandos.
16
*
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
21
*
22
* Mandos is distributed in the hope that it will be useful, but
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
23
21
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
22
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
23
* General Public License for more details.
26
24
*
27
25
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
29
28
*
30
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
31
30
*/
32
31
33
32
/* Needed by GPGME, specifically gpgme_data_seek() */
34
33
#ifndef _LARGEFILE_SOURCE
35
34
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
35
#endif
37
36
#ifndef _FILE_OFFSET_BITS
38
37
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
38
#endif
40
39
41
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
41
43
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
46
45
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
49
48
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
53
51
#include <sys/ioctl.h> /* ioctl */
54
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
53
sockaddr_in6, PF_INET6,
56
54
SOCK_STREAM, uid_t, gid_t, open(),
57
55
opendir(), DIR */
58
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
59
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
63
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
61
*/
65
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
63
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() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
74
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
68
SIOCSIFFLAGS, if_indextoname(),
76
69
if_nametoindex(), IF_NAMESIZE */
79
72
*/
80
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
74
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
85
77
#include <iso646.h> /* not, or, and */
86
78
#include <argp.h> /* struct argp_option, error_t, struct
87
79
argp_state, struct argp,
90
82
#include <signal.h> /* sigemptyset(), sigaddset(),
91
83
sigaction(), SIGTERM, sig_atomic_t,
92
84
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
85
105
86
#ifdef __linux__
106
87
#include <sys/klog.h> /* klogctl() */
124
105
init_gnutls_session(),
125
106
GNUTLS_* */
126
107
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
129
110
130
111
/* GPGME */
131
112
#include <gpgme.h> /* All GPGME types, constants and
139
120
#define PATHDIR "/conf/conf.d/mandos"
140
121
#define SECKEY "seckey.txt"
141
122
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
123
144
124
bool debug = false;
145
125
static const char mandos_protocol_version[] = "1";
146
126
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
154
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
157
const char *ip;
158
in_port_t port;
159
AvahiIfIndex if_index;
160
int af;
161
struct timespec last_seen;
162
struct server *next;
163
struct server *prev;
164
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
165
128
166
129
/* Used for passing in values through the Avahi callback functions */
167
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
168
132
AvahiServer *server;
169
133
gnutls_certificate_credentials_t cred;
170
134
unsigned int dh_bits;
171
135
gnutls_dh_params_t dh_params;
172
136
const char *priority;
173
137
gpgme_ctx_t ctx;
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
177
138
} mandos_context;
178
139
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
181
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
184
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
187
int e = errno;
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
190
errno = e;
191
perror(print_text);
192
}
193
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_list ap;
197
va_start (ap, format);
198
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
202
}
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
203
144
204
145
/*
205
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
147
* bytes. "buffer_capacity" is how much is currently allocated,
207
148
* "buffer_length" is how much is already used.
208
149
*/
209
__attribute__((nonnull, warn_unused_result))
210
150
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
151
size_t buffer_capacity){
212
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
if(new_buf == NULL){
215
int old_errno = errno;
216
free(*buffer);
217
errno = old_errno;
218
*buffer = NULL;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
219
155
return 0;
220
156
}
221
*buffer = new_buf;
222
157
buffer_capacity += BUFFER_SIZE;
223
158
}
224
159
return buffer_capacity;
225
160
}
226
161
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
231
int ret;
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
235
return false;
236
}
237
*new_server = (server){ .ip = strdup(ip),
238
.port = port,
239
.if_index = if_index,
240
.af = af };
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
243
free(new_server);
244
return false;
245
}
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
if(ret == -1){
248
perror_plus("clock_gettime");
249
#ifdef __GNUC__
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
252
#endif
253
free((char *)(new_server->ip));
254
#ifdef __GNUC__
255
#pragma GCC diagnostic pop
256
#endif
257
free(new_server);
258
return false;
259
}
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
265
} else {
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
271
}
272
return true;
273
}
274
275
/* Set effective uid to 0, return errno */
276
__attribute__((warn_unused_result))
277
int raise_privileges(void){
278
int old_errno = errno;
279
int ret = 0;
280
if(seteuid(0) == -1){
281
ret = errno;
282
}
283
errno = old_errno;
284
return ret;
285
}
286
287
/* Set effective and real user ID to 0. Return errno. */
288
__attribute__((warn_unused_result))
289
int raise_privileges_permanently(void){
290
int old_errno = errno;
291
int ret = raise_privileges();
292
if(ret != 0){
293
errno = old_errno;
294
return ret;
295
}
296
if(setuid(0) == -1){
297
ret = errno;
298
}
299
errno = old_errno;
300
return ret;
301
}
302
303
/* Set effective user ID to unprivileged saved user ID */
304
__attribute__((warn_unused_result))
305
int lower_privileges(void){
306
int old_errno = errno;
307
int ret = 0;
308
if(seteuid(uid) == -1){
309
ret = errno;
310
}
311
errno = old_errno;
312
return ret;
313
}
314
315
/* Lower privileges permanently */
316
__attribute__((warn_unused_result))
317
int lower_privileges_permanently(void){
318
int old_errno = errno;
319
int ret = 0;
320
if(setuid(uid) == -1){
321
ret = errno;
322
}
323
errno = old_errno;
324
return ret;
325
}
326
327
162
/*
328
163
* Initialize GPGME.
329
164
*/
330
__attribute__((nonnull, warn_unused_result))
331
static bool init_gpgme(const char * const seckey,
332
const char * const pubkey,
333
const char * const tempdir,
334
mandos_context *mc){
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
335
167
gpgme_error_t rc;
336
168
gpgme_engine_info_t engine_info;
337
169
170
338
171
/*
339
172
* Helper function to insert pub and seckey to the engine keyring.
340
173
*/
341
bool import_key(const char * const filename){
174
bool import_key(const char *filename){
342
175
int ret;
343
176
int fd;
344
177
gpgme_data_t pgp_data;
345
178
346
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
347
180
if(fd == -1){
348
perror_plus("open");
181
perror("open");
349
182
return false;
350
183
}
351
184
352
/* Workaround for systems without a real-time clock; see also
353
Debian bug #894495: <https://bugs.debian.org/894495> */
354
do {
355
{
356
time_t currtime = time(NULL);
357
if(currtime != (time_t)-1){
358
struct tm tm;
359
if(gmtime_r(&currtime, &tm) == NULL) {
360
perror_plus("gmtime_r");
361
break;
362
}
363
if(tm.tm_year != 70 or tm.tm_mon != 0){
364
break;
365
}
366
if(debug){
367
fprintf_plus(stderr, "System clock is January 1970");
368
}
369
} else {
370
if(debug){
371
fprintf_plus(stderr, "System clock is invalid");
372
}
373
}
374
}
375
struct stat keystat;
376
ret = fstat(fd, &keystat);
377
if(ret != 0){
378
perror_plus("fstat");
379
break;
380
}
381
ret = raise_privileges();
382
if(ret != 0){
383
errno = ret;
384
perror_plus("Failed to raise privileges");
385
break;
386
}
387
if(debug){
388
fprintf_plus(stderr,
389
"Setting system clock to key file mtime");
390
}
391
time_t keytime = keystat.st_mtim.tv_sec;
392
if(stime(&keytime) != 0){
393
perror_plus("stime");
394
}
395
ret = lower_privileges();
396
if(ret != 0){
397
errno = ret;
398
perror_plus("Failed to lower privileges");
399
}
400
} while(false);
401
402
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
403
186
if(rc != GPG_ERR_NO_ERROR){
404
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
406
189
return false;
407
190
}
408
191
409
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
410
193
if(rc != GPG_ERR_NO_ERROR){
411
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
413
196
return false;
414
197
}
415
{
416
gpgme_import_result_t import_result
417
= gpgme_op_import_result(mc->ctx);
418
if((import_result->imported < 1
419
or import_result->not_imported > 0)
420
and import_result->unchanged == 0){
421
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
422
fprintf_plus(stderr,
423
"The total number of considered keys: %d\n",
424
import_result->considered);
425
fprintf_plus(stderr,
426
"The number of keys without user ID: %d\n",
427
import_result->no_user_id);
428
fprintf_plus(stderr,
429
"The total number of imported keys: %d\n",
430
import_result->imported);
431
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
432
import_result->imported_rsa);
433
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
434
import_result->unchanged);
435
fprintf_plus(stderr, "The number of new user IDs: %d\n",
436
import_result->new_user_ids);
437
fprintf_plus(stderr, "The number of new sub keys: %d\n",
438
import_result->new_sub_keys);
439
fprintf_plus(stderr, "The number of new signatures: %d\n",
440
import_result->new_signatures);
441
fprintf_plus(stderr, "The number of new revocations: %d\n",
442
import_result->new_revocations);
443
fprintf_plus(stderr,
444
"The total number of secret keys read: %d\n",
445
import_result->secret_read);
446
fprintf_plus(stderr,
447
"The number of imported secret keys: %d\n",
448
import_result->secret_imported);
449
fprintf_plus(stderr,
450
"The number of unchanged secret keys: %d\n",
451
import_result->secret_unchanged);
452
fprintf_plus(stderr, "The number of keys not imported: %d\n",
453
import_result->not_imported);
454
for(gpgme_import_status_t import_status
455
= import_result->imports;
456
import_status != NULL;
457
import_status = import_status->next){
458
fprintf_plus(stderr, "Import status for key: %s\n",
459
import_status->fpr);
460
if(import_status->result != GPG_ERR_NO_ERROR){
461
fprintf_plus(stderr, "Import result: %s: %s\n",
462
gpgme_strsource(import_status->result),
463
gpgme_strerror(import_status->result));
464
}
465
fprintf_plus(stderr, "Key status:\n");
466
fprintf_plus(stderr,
467
import_status->status & GPGME_IMPORT_NEW
468
? "The key was new.\n"
469
: "The key was not new.\n");
470
fprintf_plus(stderr,
471
import_status->status & GPGME_IMPORT_UID
472
? "The key contained new user IDs.\n"
473
: "The key did not contain new user IDs.\n");
474
fprintf_plus(stderr,
475
import_status->status & GPGME_IMPORT_SIG
476
? "The key contained new signatures.\n"
477
: "The key did not contain new signatures.\n");
478
fprintf_plus(stderr,
479
import_status->status & GPGME_IMPORT_SUBKEY
480
? "The key contained new sub keys.\n"
481
: "The key did not contain new sub keys.\n");
482
fprintf_plus(stderr,
483
import_status->status & GPGME_IMPORT_SECRET
484
? "The key contained a secret key.\n"
485
: "The key did not contain a secret key.\n");
486
}
487
return false;
488
}
489
}
490
198
491
ret = close(fd);
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
492
200
if(ret == -1){
493
perror_plus("close");
201
perror("close");
494
202
}
495
203
gpgme_data_release(pgp_data);
496
204
return true;
497
205
}
498
206
499
207
if(debug){
500
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
501
209
}
502
210
503
211
/* Init GPGME */
504
212
gpgme_check_version(NULL);
505
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
506
214
if(rc != GPG_ERR_NO_ERROR){
507
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
508
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
509
217
return false;
510
218
}
511
219
512
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
513
221
rc = gpgme_get_engine_info(&engine_info);
514
222
if(rc != GPG_ERR_NO_ERROR){
515
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
516
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
517
225
return false;
518
226
}
519
227
while(engine_info != NULL){
525
233
engine_info = engine_info->next;
526
234
}
527
235
if(engine_info == NULL){
528
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
529
tempdir);
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
530
237
return false;
531
238
}
532
239
533
240
/* Create new GPGME "context" */
534
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
535
242
if(rc != GPG_ERR_NO_ERROR){
536
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
537
gpgme_strsource(rc), gpgme_strerror(rc));
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
538
245
return false;
539
246
}
540
247
549
256
* Decrypt OpenPGP data.
550
257
* Returns -1 on error
551
258
*/
552
__attribute__((nonnull, warn_unused_result))
553
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
554
260
size_t crypto_size,
555
char **plaintext,
556
mandos_context *mc){
261
char **plaintext){
557
262
gpgme_data_t dh_crypto, dh_plain;
558
263
gpgme_error_t rc;
559
264
ssize_t ret;
561
266
ssize_t plaintext_length = 0;
562
267
563
268
if(debug){
564
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
565
270
}
566
271
567
272
/* Create new GPGME data buffer from memory cryptotext */
568
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
569
274
0);
570
275
if(rc != GPG_ERR_NO_ERROR){
571
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
572
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
573
278
return -1;
574
279
}
575
280
576
281
/* Create new empty GPGME data buffer for the plaintext */
577
282
rc = gpgme_data_new(&dh_plain);
578
283
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
581
286
gpgme_data_release(dh_crypto);
582
287
return -1;
583
288
}
584
289
585
290
/* Decrypt data from the cryptotext data buffer to the plaintext
586
291
data buffer */
587
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
588
293
if(rc != GPG_ERR_NO_ERROR){
589
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
590
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
591
296
plaintext_length = -1;
592
297
if(debug){
593
298
gpgme_decrypt_result_t result;
594
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
595
300
if(result == NULL){
596
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
597
302
} else {
598
if(result->unsupported_algorithm != NULL) {
599
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
600
result->unsupported_algorithm);
601
}
602
fprintf_plus(stderr, "Wrong key usage: %s\n",
603
result->wrong_key_usage ? "Yes" : "No");
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
604
307
if(result->file_name != NULL){
605
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
606
309
}
607
608
for(gpgme_recipient_t r = result->recipients; r != NULL;
609
r = r->next){
610
fprintf_plus(stderr, "Public key algorithm: %s\n",
611
gpgme_pubkey_algo_name(r->pubkey_algo));
612
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
613
fprintf_plus(stderr, "Secret key available: %s\n",
614
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
615
320
}
616
321
}
617
322
}
619
324
}
620
325
621
326
if(debug){
622
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
623
328
}
624
329
625
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
626
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
627
perror_plus("gpgme_data_seek");
332
perror("gpgme_data_seek");
628
333
plaintext_length = -1;
629
334
goto decrypt_end;
630
335
}
632
337
*plaintext = NULL;
633
338
while(true){
634
339
plaintext_capacity = incbuffer(plaintext,
635
(size_t)plaintext_length,
636
plaintext_capacity);
340
(size_t)plaintext_length,
341
plaintext_capacity);
637
342
if(plaintext_capacity == 0){
638
perror_plus("incbuffer");
639
plaintext_length = -1;
640
goto decrypt_end;
343
perror("incbuffer");
344
plaintext_length = -1;
345
goto decrypt_end;
641
346
}
642
347
643
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
648
353
break;
649
354
}
650
355
if(ret < 0){
651
perror_plus("gpgme_data_read");
356
perror("gpgme_data_read");
652
357
plaintext_length = -1;
653
358
goto decrypt_end;
654
359
}
656
361
}
657
362
658
363
if(debug){
659
fprintf_plus(stderr, "Decrypted password is: ");
364
fprintf(stderr, "Decrypted password is: ");
660
365
for(ssize_t i = 0; i < plaintext_length; i++){
661
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
662
367
}
673
378
return plaintext_length;
674
379
}
675
380
676
__attribute__((warn_unused_result, const))
677
static const char *safe_string(const char *str){
678
if(str == NULL)
679
return "(unknown)";
680
return str;
681
}
682
683
__attribute__((warn_unused_result))
684
static const char *safer_gnutls_strerror(int value){
685
const char *ret = gnutls_strerror(value);
686
return safe_string(ret);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
385
ret = "(unknown)";
386
return ret;
687
387
}
688
388
689
389
/* GnuTLS log function callback */
690
__attribute__((nonnull))
691
390
static void debuggnutls(__attribute__((unused)) int level,
692
391
const char* string){
693
fprintf_plus(stderr, "GnuTLS: %s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
694
393
}
695
394
696
__attribute__((nonnull(1, 2, 4), warn_unused_result))
697
395
static int init_gnutls_global(const char *pubkeyfilename,
698
const char *seckeyfilename,
699
const char *dhparamsfilename,
700
mandos_context *mc){
396
const char *seckeyfilename){
701
397
int ret;
702
unsigned int uret;
703
398
704
399
if(debug){
705
fprintf_plus(stderr, "Initializing GnuTLS\n");
400
fprintf(stderr, "Initializing GnuTLS\n");
401
}
402
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
407
return -1;
706
408
}
707
409
708
410
if(debug){
714
416
}
715
417
716
418
/* OpenPGP credentials */
717
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
718
420
if(ret != GNUTLS_E_SUCCESS){
719
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
720
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
721
427
return -1;
722
428
}
723
429
724
430
if(debug){
725
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
726
" secret key %s as GnuTLS credentials\n",
727
pubkeyfilename,
728
seckeyfilename);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
729
434
}
730
435
731
436
ret = gnutls_certificate_set_openpgp_key_file
732
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
733
438
GNUTLS_OPENPGP_FMT_BASE64);
734
439
if(ret != GNUTLS_E_SUCCESS){
735
fprintf_plus(stderr,
736
"Error[%d] while reading the OpenPGP key pair ('%s',"
737
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
738
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
739
safer_gnutls_strerror(ret));
440
fprintf(stderr,
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
740
445
goto globalfail;
741
446
}
742
447
743
448
/* GnuTLS server initialization */
744
ret = gnutls_dh_params_init(&mc->dh_params);
745
if(ret != GNUTLS_E_SUCCESS){
746
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
747
" initialization: %s\n",
748
safer_gnutls_strerror(ret));
749
goto globalfail;
750
}
751
/* If a Diffie-Hellman parameters file was given, try to use it */
752
if(dhparamsfilename != NULL){
753
gnutls_datum_t params = { .data = NULL, .size = 0 };
754
do {
755
int dhpfile = open(dhparamsfilename, O_RDONLY);
756
if(dhpfile == -1){
757
perror_plus("open");
758
dhparamsfilename = NULL;
759
break;
760
}
761
size_t params_capacity = 0;
762
while(true){
763
params_capacity = incbuffer((char **)¶ms.data,
764
(size_t)params.size,
765
(size_t)params_capacity);
766
if(params_capacity == 0){
767
perror_plus("incbuffer");
768
free(params.data);
769
params.data = NULL;
770
dhparamsfilename = NULL;
771
break;
772
}
773
ssize_t bytes_read = read(dhpfile,
774
params.data + params.size,
775
BUFFER_SIZE);
776
/* EOF */
777
if(bytes_read == 0){
778
break;
779
}
780
/* check bytes_read for failure */
781
if(bytes_read < 0){
782
perror_plus("read");
783
free(params.data);
784
params.data = NULL;
785
dhparamsfilename = NULL;
786
break;
787
}
788
params.size += (unsigned int)bytes_read;
789
}
790
ret = close(dhpfile);
791
if(ret == -1){
792
perror_plus("close");
793
}
794
if(params.data == NULL){
795
dhparamsfilename = NULL;
796
}
797
if(dhparamsfilename == NULL){
798
break;
799
}
800
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
801
GNUTLS_X509_FMT_PEM);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Failed to parse DH parameters in file"
804
" \"%s\": %s\n", dhparamsfilename,
805
safer_gnutls_strerror(ret));
806
dhparamsfilename = NULL;
807
}
808
free(params.data);
809
} while(false);
810
}
811
if(dhparamsfilename == NULL){
812
if(mc->dh_bits == 0){
813
/* Find out the optimal number of DH bits */
814
/* Try to read the private key file */
815
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
816
do {
817
int secfile = open(seckeyfilename, O_RDONLY);
818
if(secfile == -1){
819
perror_plus("open");
820
break;
821
}
822
size_t buffer_capacity = 0;
823
while(true){
824
buffer_capacity = incbuffer((char **)&buffer.data,
825
(size_t)buffer.size,
826
(size_t)buffer_capacity);
827
if(buffer_capacity == 0){
828
perror_plus("incbuffer");
829
free(buffer.data);
830
buffer.data = NULL;
831
break;
832
}
833
ssize_t bytes_read = read(secfile,
834
buffer.data + buffer.size,
835
BUFFER_SIZE);
836
/* EOF */
837
if(bytes_read == 0){
838
break;
839
}
840
/* check bytes_read for failure */
841
if(bytes_read < 0){
842
perror_plus("read");
843
free(buffer.data);
844
buffer.data = NULL;
845
break;
846
}
847
buffer.size += (unsigned int)bytes_read;
848
}
849
close(secfile);
850
} while(false);
851
/* If successful, use buffer to parse private key */
852
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
853
if(buffer.data != NULL){
854
{
855
gnutls_openpgp_privkey_t privkey = NULL;
856
ret = gnutls_openpgp_privkey_init(&privkey);
857
if(ret != GNUTLS_E_SUCCESS){
858
fprintf_plus(stderr, "Error initializing OpenPGP key"
859
" structure: %s",
860
safer_gnutls_strerror(ret));
861
free(buffer.data);
862
buffer.data = NULL;
863
} else {
864
ret = gnutls_openpgp_privkey_import
865
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
866
if(ret != GNUTLS_E_SUCCESS){
867
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
868
safer_gnutls_strerror(ret));
869
privkey = NULL;
870
}
871
free(buffer.data);
872
buffer.data = NULL;
873
if(privkey != NULL){
874
/* Use private key to suggest an appropriate
875
sec_param */
876
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
877
gnutls_openpgp_privkey_deinit(privkey);
878
if(debug){
879
fprintf_plus(stderr, "This OpenPGP key implies using"
880
" a GnuTLS security parameter \"%s\".\n",
881
safe_string(gnutls_sec_param_get_name
882
(sec_param)));
883
}
884
}
885
}
886
}
887
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
888
/* Err on the side of caution */
889
sec_param = GNUTLS_SEC_PARAM_ULTRA;
890
if(debug){
891
fprintf_plus(stderr, "Falling back to security parameter"
892
" \"%s\"\n",
893
safe_string(gnutls_sec_param_get_name
894
(sec_param)));
895
}
896
}
897
}
898
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
899
if(uret != 0){
900
mc->dh_bits = uret;
901
if(debug){
902
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
903
" implies %u DH bits; using that.\n",
904
safe_string(gnutls_sec_param_get_name
905
(sec_param)),
906
mc->dh_bits);
907
}
908
} else {
909
fprintf_plus(stderr, "Failed to get implied number of DH"
910
" bits for security parameter \"%s\"): %s\n",
911
safe_string(gnutls_sec_param_get_name
912
(sec_param)),
913
safer_gnutls_strerror(ret));
914
goto globalfail;
915
}
916
} else if(debug){
917
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
918
mc->dh_bits);
919
}
920
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
921
if(ret != GNUTLS_E_SUCCESS){
922
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
923
" bits): %s\n", mc->dh_bits,
924
safer_gnutls_strerror(ret));
925
goto globalfail;
926
}
927
}
928
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
929
463
930
464
return 0;
931
465
932
466
globalfail:
933
467
934
gnutls_certificate_free_credentials(mc->cred);
935
gnutls_dh_params_deinit(mc->dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
936
471
return -1;
937
472
}
938
473
939
__attribute__((nonnull, warn_unused_result))
940
static int init_gnutls_session(gnutls_session_t *session,
941
mandos_context *mc){
474
static int init_gnutls_session(gnutls_session_t *session){
942
475
int ret;
943
476
/* GnuTLS session creation */
944
477
do {
945
478
ret = gnutls_init(session, GNUTLS_SERVER);
946
if(quit_now){
947
return -1;
948
}
949
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
950
480
if(ret != GNUTLS_E_SUCCESS){
951
fprintf_plus(stderr,
952
"Error in GnuTLS session initialization: %s\n",
953
safer_gnutls_strerror(ret));
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
954
483
}
955
484
956
485
{
957
486
const char *err;
958
487
do {
959
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
960
if(quit_now){
961
gnutls_deinit(*session);
962
return -1;
963
}
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
964
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
965
490
if(ret != GNUTLS_E_SUCCESS){
966
fprintf_plus(stderr, "Syntax error at: %s\n", err);
967
fprintf_plus(stderr, "GnuTLS error: %s\n",
968
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
969
494
gnutls_deinit(*session);
970
495
return -1;
971
496
}
973
498
974
499
do {
975
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
976
mc->cred);
977
if(quit_now){
978
gnutls_deinit(*session);
979
return -1;
980
}
501
mc.cred);
981
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
982
503
if(ret != GNUTLS_E_SUCCESS){
983
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
984
safer_gnutls_strerror(ret));
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
safer_gnutls_strerror(ret));
985
506
gnutls_deinit(*session);
986
507
return -1;
987
508
}
989
510
/* ignore client certificate if any. */
990
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
991
512
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
514
992
515
return 0;
993
516
}
994
517
996
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
997
520
__attribute__((unused)) const char *txt){}
998
521
999
/* Helper function to add_local_route() and delete_local_route() */
1000
__attribute__((nonnull, warn_unused_result))
1001
static bool add_delete_local_route(const bool add,
1002
const char *address,
1003
AvahiIfIndex if_index){
1004
int ret;
1005
char helper[] = "mandos-client-iprouteadddel";
1006
char add_arg[] = "add";
1007
char delete_arg[] = "delete";
1008
char debug_flag[] = "--debug";
1009
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1010
if(pluginhelperdir == NULL){
1011
if(debug){
1012
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1013
" variable not set; cannot run helper\n");
1014
}
1015
return false;
1016
}
1017
1018
char interface[IF_NAMESIZE];
1019
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1020
perror_plus("if_indextoname");
1021
return false;
1022
}
1023
1024
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1025
if(devnull == -1){
1026
perror_plus("open(\"/dev/null\", O_RDONLY)");
1027
return false;
1028
}
1029
pid_t pid = fork();
1030
if(pid == 0){
1031
/* Child */
1032
/* Raise privileges */
1033
errno = raise_privileges_permanently();
1034
if(errno != 0){
1035
perror_plus("Failed to raise privileges");
1036
/* _exit(EX_NOPERM); */
1037
} else {
1038
/* Set group */
1039
errno = 0;
1040
ret = setgid(0);
1041
if(ret == -1){
1042
perror_plus("setgid");
1043
_exit(EX_NOPERM);
1044
}
1045
/* Reset supplementary groups */
1046
errno = 0;
1047
ret = setgroups(0, NULL);
1048
if(ret == -1){
1049
perror_plus("setgroups");
1050
_exit(EX_NOPERM);
1051
}
1052
}
1053
ret = dup2(devnull, STDIN_FILENO);
1054
if(ret == -1){
1055
perror_plus("dup2(devnull, STDIN_FILENO)");
1056
_exit(EX_OSERR);
1057
}
1058
ret = close(devnull);
1059
if(ret == -1){
1060
perror_plus("close");
1061
_exit(EX_OSERR);
1062
}
1063
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1064
if(ret == -1){
1065
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1066
_exit(EX_OSERR);
1067
}
1068
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1069
O_RDONLY
1070
| O_DIRECTORY
1071
| O_PATH
1072
| O_CLOEXEC));
1073
if(helperdir_fd == -1){
1074
perror_plus("open");
1075
_exit(EX_UNAVAILABLE);
1076
}
1077
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1078
helper, O_RDONLY));
1079
if(helper_fd == -1){
1080
perror_plus("openat");
1081
close(helperdir_fd);
1082
_exit(EX_UNAVAILABLE);
1083
}
1084
close(helperdir_fd);
1085
#ifdef __GNUC__
1086
#pragma GCC diagnostic push
1087
#pragma GCC diagnostic ignored "-Wcast-qual"
1088
#endif
1089
if(fexecve(helper_fd, (char *const [])
1090
{ helper, add ? add_arg : delete_arg, (char *)address,
1091
interface, debug ? debug_flag : NULL, NULL },
1092
environ) == -1){
1093
#ifdef __GNUC__
1094
#pragma GCC diagnostic pop
1095
#endif
1096
perror_plus("fexecve");
1097
_exit(EXIT_FAILURE);
1098
}
1099
}
1100
if(pid == -1){
1101
perror_plus("fork");
1102
return false;
1103
}
1104
int status;
1105
pid_t pret = -1;
1106
errno = 0;
1107
do {
1108
pret = waitpid(pid, &status, 0);
1109
if(pret == -1 and errno == EINTR and quit_now){
1110
int errno_raising = 0;
1111
if((errno = raise_privileges()) != 0){
1112
errno_raising = errno;
1113
perror_plus("Failed to raise privileges in order to"
1114
" kill helper program");
1115
}
1116
if(kill(pid, SIGTERM) == -1){
1117
perror_plus("kill");
1118
}
1119
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1120
perror_plus("Failed to lower privileges after killing"
1121
" helper program");
1122
}
1123
return false;
1124
}
1125
} while(pret == -1 and errno == EINTR);
1126
if(pret == -1){
1127
perror_plus("waitpid");
1128
return false;
1129
}
1130
if(WIFEXITED(status)){
1131
if(WEXITSTATUS(status) != 0){
1132
fprintf_plus(stderr, "Error: iprouteadddel exited"
1133
" with status %d\n", WEXITSTATUS(status));
1134
return false;
1135
}
1136
return true;
1137
}
1138
if(WIFSIGNALED(status)){
1139
fprintf_plus(stderr, "Error: iprouteadddel died by"
1140
" signal %d\n", WTERMSIG(status));
1141
return false;
1142
}
1143
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1144
return false;
1145
}
1146
1147
__attribute__((nonnull, warn_unused_result))
1148
static bool add_local_route(const char *address,
1149
AvahiIfIndex if_index){
1150
if(debug){
1151
fprintf_plus(stderr, "Adding route to %s\n", address);
1152
}
1153
return add_delete_local_route(true, address, if_index);
1154
}
1155
1156
__attribute__((nonnull, warn_unused_result))
1157
static bool delete_local_route(const char *address,
1158
AvahiIfIndex if_index){
1159
if(debug){
1160
fprintf_plus(stderr, "Removing route to %s\n", address);
1161
}
1162
return add_delete_local_route(false, address, if_index);
1163
}
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
1164
524
1165
525
/* Called when a Mandos server is found */
1166
__attribute__((nonnull, warn_unused_result))
1167
static int start_mandos_communication(const char *ip, in_port_t port,
526
static int start_mandos_communication(const char *ip, uint16_t port,
1168
527
AvahiIfIndex if_index,
1169
int af, mandos_context *mc){
528
int af){
1170
529
int ret, tcp_sd = -1;
1171
530
ssize_t sret;
1172
struct sockaddr_storage to;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
1173
535
char *buffer = NULL;
1174
char *decrypted_buffer = NULL;
536
char *decrypted_buffer;
1175
537
size_t buffer_length = 0;
1176
538
size_t buffer_capacity = 0;
1177
539
size_t written;
1178
int retval = -1;
540
int retval = 0;
1179
541
gnutls_session_t session;
1180
542
int pf; /* Protocol family */
1181
bool route_added = false;
1182
1183
errno = 0;
1184
543
1185
544
if(quit_now){
1186
errno = EINTR;
1187
545
return -1;
1188
546
}
1189
547
1195
553
pf = PF_INET;
1196
554
break;
1197
555
default:
1198
fprintf_plus(stderr, "Bad address family: %d\n", af);
1199
errno = EINVAL;
556
fprintf(stderr, "Bad address family: %d\n", af);
1200
557
return -1;
1201
558
}
1202
559
1203
/* If the interface is specified and we have a list of interfaces */
1204
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1205
/* Check if the interface is one of the interfaces we are using */
1206
bool match = false;
1207
{
1208
char *interface = NULL;
1209
while((interface = argz_next(mc->interfaces,
1210
mc->interfaces_size,
1211
interface))){
1212
if(if_nametoindex(interface) == (unsigned int)if_index){
1213
match = true;
1214
break;
1215
}
1216
}
1217
}
1218
if(not match){
1219
/* This interface does not match any in the list, so we don't
1220
connect to the server */
1221
if(debug){
1222
char interface[IF_NAMESIZE];
1223
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1224
perror_plus("if_indextoname");
1225
} else {
1226
fprintf_plus(stderr, "Skipping server on non-used interface"
1227
" \"%s\"\n",
1228
if_indextoname((unsigned int)if_index,
1229
interface));
1230
}
1231
}
1232
return -1;
1233
}
1234
}
1235
1236
ret = init_gnutls_session(&session, mc);
560
ret = init_gnutls_session(&session);
1237
561
if(ret != 0){
1238
562
return -1;
1239
563
}
1240
564
1241
565
if(debug){
1242
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1243
PRIuMAX "\n", ip, (uintmax_t)port);
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
567
"\n", ip, port);
1244
568
}
1245
569
1246
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
1247
571
if(tcp_sd < 0){
1248
int e = errno;
1249
perror_plus("socket");
1250
errno = e;
572
perror("socket");
573
retval = -1;
1251
574
goto mandos_end;
1252
575
}
1253
576
1254
577
if(quit_now){
1255
errno = EINTR;
1256
578
goto mandos_end;
1257
579
}
1258
580
581
memset(&to, 0, sizeof(to));
1259
582
if(af == AF_INET6){
1260
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1261
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1262
ret = inet_pton(af, ip, &to6->sin6_addr);
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1263
585
} else { /* IPv4 */
1264
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1265
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1266
ret = inet_pton(af, ip, &to4->sin_addr);
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
1267
588
}
1268
589
if(ret < 0 ){
1269
int e = errno;
1270
perror_plus("inet_pton");
1271
errno = e;
590
perror("inet_pton");
591
retval = -1;
1272
592
goto mandos_end;
1273
593
}
1274
594
if(ret == 0){
1275
int e = errno;
1276
fprintf_plus(stderr, "Bad address: %s\n", ip);
1277
errno = e;
595
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
1278
597
goto mandos_end;
1279
598
}
1280
599
if(af == AF_INET6){
1281
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1282
if(IN6_IS_ADDR_LINKLOCAL
1283
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
1284
607
if(if_index == AVAHI_IF_UNSPEC){
1285
fprintf_plus(stderr, "An IPv6 link-local address is"
1286
" incomplete without a network interface\n");
1287
errno = EINVAL;
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
1288
611
goto mandos_end;
1289
612
}
1290
613
/* Set the network interface number as scope */
1291
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
614
to.in6.sin6_scope_id = (uint32_t)if_index;
1292
615
}
1293
616
} else {
1294
((struct sockaddr_in *)&to)->sin_port = htons(port);
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
1295
620
}
1296
621
1297
622
if(quit_now){
1298
errno = EINTR;
1299
623
goto mandos_end;
1300
624
}
1301
625
1303
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1304
628
char interface[IF_NAMESIZE];
1305
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1306
perror_plus("if_indextoname");
630
perror("if_indextoname");
1307
631
} else {
1308
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1309
"\n", ip, interface, (uintmax_t)port);
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
1310
634
}
1311
635
} else {
1312
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1313
ip, (uintmax_t)port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
1314
638
}
1315
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1316
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1317
if(af == AF_INET6){
1318
ret = getnameinfo((struct sockaddr *)&to,
1319
sizeof(struct sockaddr_in6),
1320
addrstr, sizeof(addrstr), NULL, 0,
1321
NI_NUMERICHOST);
1322
} else {
1323
ret = getnameinfo((struct sockaddr *)&to,
1324
sizeof(struct sockaddr_in),
1325
addrstr, sizeof(addrstr), NULL, 0,
1326
NI_NUMERICHOST);
1327
}
1328
if(ret == EAI_SYSTEM){
1329
perror_plus("getnameinfo");
1330
} else if(ret != 0) {
1331
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1332
} else if(strcmp(addrstr, ip) != 0){
1333
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1334
}
1335
}
1336
1337
if(quit_now){
1338
errno = EINTR;
1339
goto mandos_end;
1340
}
1341
1342
while(true){
1343
if(af == AF_INET6){
1344
ret = connect(tcp_sd, (struct sockaddr *)&to,
1345
sizeof(struct sockaddr_in6));
1346
} else {
1347
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1348
sizeof(struct sockaddr_in));
1349
}
1350
if(ret < 0){
1351
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1352
and if_index != AVAHI_IF_UNSPEC
1353
and connect_to == NULL
1354
and not route_added and
1355
((af == AF_INET6 and not
1356
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1357
&to)->sin6_addr)))
1358
or (af == AF_INET and
1359
/* Not a a IPv4LL address */
1360
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1361
& 0xFFFF0000L) != 0xA9FE0000L))){
1362
/* Work around Avahi bug - Avahi does not announce link-local
1363
addresses if it has a global address, so local hosts with
1364
*only* a link-local address (e.g. Mandos clients) cannot
1365
connect to a Mandos server announced by Avahi on a server
1366
host with a global address. Work around this by retrying
1367
with an explicit route added with the server's address.
1368
1369
Avahi bug reference:
1370
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1371
https://bugs.debian.org/587961
1372
*/
1373
if(debug){
1374
fprintf_plus(stderr, "Mandos server unreachable, trying"
1375
" direct route\n");
1376
}
1377
int e = errno;
1378
route_added = add_local_route(ip, if_index);
1379
if(route_added){
1380
continue;
1381
}
1382
errno = e;
1383
}
1384
if(errno != ECONNREFUSED or debug){
1385
int e = errno;
1386
perror_plus("connect");
1387
errno = e;
1388
}
1389
goto mandos_end;
1390
}
1391
1392
if(quit_now){
1393
errno = EINTR;
1394
goto mandos_end;
1395
}
1396
break;
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
650
perror("inet_ntop");
651
} else {
652
if(strcmp(addrstr, ip) != 0){
653
fprintf(stderr, "Canonical address form: %s\n", addrstr);
654
}
655
}
656
}
657
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
667
if(ret < 0){
668
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
1397
675
}
1398
676
1399
677
const char *out = mandos_protocol_version;
1401
679
while(true){
1402
680
size_t out_size = strlen(out);
1403
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1404
out_size - written));
682
out_size - written));
1405
683
if(ret == -1){
1406
int e = errno;
1407
perror_plus("write");
1408
errno = e;
684
perror("write");
685
retval = -1;
1409
686
goto mandos_end;
1410
687
}
1411
688
written += (size_t)ret;
1421
698
}
1422
699
1423
700
if(quit_now){
1424
errno = EINTR;
1425
701
goto mandos_end;
1426
702
}
1427
703
}
1428
704
1429
705
if(debug){
1430
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1431
707
}
1432
708
1433
709
if(quit_now){
1434
errno = EINTR;
1435
710
goto mandos_end;
1436
711
}
1437
712
1438
/* This casting via intptr_t is to eliminate warning about casting
1439
an int to a pointer type. This is exactly how the GnuTLS Guile
1440
function "set-session-transport-fd!" does it. */
1441
gnutls_transport_set_ptr(session,
1442
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1443
714
1444
715
if(quit_now){
1445
errno = EINTR;
1446
716
goto mandos_end;
1447
717
}
1448
718
1449
719
do {
1450
720
ret = gnutls_handshake(session);
1451
721
if(quit_now){
1452
errno = EINTR;
1453
722
goto mandos_end;
1454
723
}
1455
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1456
725
1457
726
if(ret != GNUTLS_E_SUCCESS){
1458
727
if(debug){
1459
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1460
729
gnutls_perror(ret);
1461
730
}
1462
errno = EPROTO;
731
retval = -1;
1463
732
goto mandos_end;
1464
733
}
1465
734
1466
735
/* Read OpenPGP packet that contains the wanted password */
1467
736
1468
737
if(debug){
1469
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1470
" %s\n", ip);
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
739
ip);
1471
740
}
1472
741
1473
742
while(true){
1474
743
1475
744
if(quit_now){
1476
errno = EINTR;
1477
745
goto mandos_end;
1478
746
}
1479
747
1480
748
buffer_capacity = incbuffer(&buffer, buffer_length,
1481
buffer_capacity);
749
buffer_capacity);
1482
750
if(buffer_capacity == 0){
1483
int e = errno;
1484
perror_plus("incbuffer");
1485
errno = e;
751
perror("incbuffer");
752
retval = -1;
1486
753
goto mandos_end;
1487
754
}
1488
755
1489
756
if(quit_now){
1490
errno = EINTR;
1491
757
goto mandos_end;
1492
758
}
1493
759
1506
772
ret = gnutls_handshake(session);
1507
773
1508
774
if(quit_now){
1509
errno = EINTR;
1510
775
goto mandos_end;
1511
776
}
1512
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1513
778
if(ret < 0){
1514
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1515
"***\n");
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1516
780
gnutls_perror(ret);
1517
errno = EPROTO;
781
retval = -1;
1518
782
goto mandos_end;
1519
783
}
1520
784
break;
1521
785
default:
1522
fprintf_plus(stderr, "Unknown error while reading data from"
1523
" encrypted session with Mandos server\n");
786
fprintf(stderr, "Unknown error while reading data from"
787
" encrypted session with Mandos server\n");
788
retval = -1;
1524
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1525
errno = EIO;
1526
790
goto mandos_end;
1527
791
}
1528
792
} else {
1531
795
}
1532
796
1533
797
if(debug){
1534
fprintf_plus(stderr, "Closing TLS session\n");
1535
}
1536
1537
if(quit_now){
1538
errno = EINTR;
1539
goto mandos_end;
1540
}
1541
1542
do {
1543
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1544
if(quit_now){
1545
errno = EINTR;
1546
goto mandos_end;
1547
}
1548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
798
fprintf(stderr, "Closing TLS session\n");
799
}
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
1549
810
1550
811
if(buffer_length > 0){
1551
812
ssize_t decrypted_buffer_size;
1552
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1553
&decrypted_buffer, mc);
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
buffer_length,
815
&decrypted_buffer);
1554
816
if(decrypted_buffer_size >= 0){
1555
817
1556
clearerr(stdout);
1557
818
written = 0;
1558
819
while(written < (size_t) decrypted_buffer_size){
1559
820
if(quit_now){
1560
errno = EINTR;
1561
821
goto mandos_end;
1562
822
}
1563
823
1565
825
(size_t)decrypted_buffer_size - written,
1566
826
stdout);
1567
827
if(ret == 0 and ferror(stdout)){
1568
int e = errno;
1569
828
if(debug){
1570
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1571
strerror(errno));
829
fprintf(stderr, "Error writing encrypted data: %s\n",
830
strerror(errno));
1572
831
}
1573
errno = e;
1574
goto mandos_end;
832
retval = -1;
833
break;
1575
834
}
1576
835
written += (size_t)ret;
1577
836
}
1578
ret = fflush(stdout);
1579
if(ret != 0){
1580
int e = errno;
1581
if(debug){
1582
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1583
strerror(errno));
1584
}
1585
errno = e;
1586
goto mandos_end;
1587
}
1588
retval = 0;
837
free(decrypted_buffer);
838
} else {
839
retval = -1;
1589
840
}
841
} else {
842
retval = -1;
1590
843
}
1591
844
1592
845
/* Shutdown procedure */
1593
846
1594
847
mandos_end:
1595
{
1596
if(route_added){
1597
if(not delete_local_route(ip, if_index)){
1598
fprintf_plus(stderr, "Failed to delete local route to %s on"
1599
" interface %d", ip, if_index);
1600
}
1601
}
1602
int e = errno;
1603
free(decrypted_buffer);
1604
free(buffer);
1605
if(tcp_sd >= 0){
1606
ret = close(tcp_sd);
1607
}
1608
if(ret == -1){
1609
if(e == 0){
1610
e = errno;
1611
}
1612
perror_plus("close");
1613
}
1614
gnutls_deinit(session);
1615
errno = e;
1616
if(quit_now){
1617
errno = EINTR;
1618
retval = -1;
1619
}
848
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
1620
858
}
1621
859
return retval;
1622
860
}
1634
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
1635
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1636
874
flags,
1637
void *mc){
1638
if(r == NULL){
1639
return;
1640
}
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
1641
877
1642
878
/* Called whenever a service has been resolved successfully or
1643
879
timed out */
1644
880
1645
881
if(quit_now){
1646
avahi_s_service_resolver_free(r);
1647
882
return;
1648
883
}
1649
884
1650
885
switch(event){
1651
886
default:
1652
887
case AVAHI_RESOLVER_FAILURE:
1653
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1654
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1655
domain,
1656
avahi_strerror(avahi_server_errno
1657
(((mandos_context*)mc)->server)));
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
1658
891
break;
1659
892
1660
893
case AVAHI_RESOLVER_FOUND:
1662
895
char ip[AVAHI_ADDRESS_STR_MAX];
1663
896
avahi_address_snprint(ip, sizeof(ip), address);
1664
897
if(debug){
1665
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1666
PRIdMAX ") on port %" PRIu16 "\n", name,
1667
host_name, ip, (intmax_t)interface, port);
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
1668
901
}
1669
int ret = start_mandos_communication(ip, (in_port_t)port,
1670
interface,
1671
avahi_proto_to_af(proto),
1672
mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
1673
904
if(ret == 0){
1674
avahi_simple_poll_quit(simple_poll);
1675
} else {
1676
if(not add_server(ip, (in_port_t)port, interface,
1677
avahi_proto_to_af(proto),
1678
&((mandos_context*)mc)->current_server)){
1679
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1680
" list\n", name);
1681
}
905
avahi_simple_poll_quit(mc.simple_poll);
1682
906
}
1683
907
}
1684
908
}
1694
918
const char *domain,
1695
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1696
920
flags,
1697
void *mc){
1698
if(b == NULL){
1699
return;
1700
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
1701
923
1702
924
/* Called whenever a new services becomes available on the LAN or
1703
925
is removed from the LAN */
1710
932
default:
1711
933
case AVAHI_BROWSER_FAILURE:
1712
934
1713
fprintf_plus(stderr, "(Avahi browser) %s\n",
1714
avahi_strerror(avahi_server_errno
1715
(((mandos_context*)mc)->server)));
1716
avahi_simple_poll_quit(simple_poll);
935
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
1717
938
return;
1718
939
1719
940
case AVAHI_BROWSER_NEW:
1722
943
the callback function is called the Avahi server will free the
1723
944
resolver for us. */
1724
945
1725
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1726
interface, protocol, name, type,
1727
domain, protocol, 0,
1728
resolve_callback, mc) == NULL)
1729
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1730
" %s\n", name,
1731
avahi_strerror(avahi_server_errno
1732
(((mandos_context*)mc)->server)));
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
1733
951
break;
1734
952
1735
953
case AVAHI_BROWSER_REMOVE:
1738
956
case AVAHI_BROWSER_ALL_FOR_NOW:
1739
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1740
958
if(debug){
1741
fprintf_plus(stderr, "No Mandos server found, still"
1742
" searching...\n");
959
fprintf(stderr, "No Mandos server found, still searching...\n");
1743
960
}
1744
961
break;
1745
962
}
1746
963
}
1747
964
1748
/* Signal handler that stops main loop after SIGTERM */
965
/* stop main loop after sigterm has been called */
1749
966
static void handle_sigterm(int sig){
1750
967
if(quit_now){
1751
968
return;
1753
970
quit_now = 1;
1754
971
signal_received = sig;
1755
972
int old_errno = errno;
1756
/* set main loop to exit */
1757
if(simple_poll != NULL){
1758
avahi_simple_poll_quit(simple_poll);
1759
}
1760
errno = old_errno;
1761
}
1762
1763
__attribute__((nonnull, warn_unused_result))
1764
bool get_flags(const char *ifname, struct ifreq *ifr){
1765
int ret;
1766
int old_errno;
1767
1768
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1769
if(s < 0){
1770
old_errno = errno;
1771
perror_plus("socket");
1772
errno = old_errno;
1773
return false;
1774
}
1775
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1776
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1777
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1778
if(ret == -1){
1779
if(debug){
1780
old_errno = errno;
1781
perror_plus("ioctl SIOCGIFFLAGS");
1782
errno = old_errno;
1783
}
1784
if((close(s) == -1) and debug){
1785
old_errno = errno;
1786
perror_plus("close");
1787
errno = old_errno;
1788
}
1789
return false;
1790
}
1791
if((close(s) == -1) and debug){
1792
old_errno = errno;
1793
perror_plus("close");
1794
errno = old_errno;
1795
}
1796
return true;
1797
}
1798
1799
__attribute__((nonnull, warn_unused_result))
1800
bool good_flags(const char *ifname, const struct ifreq *ifr){
1801
1802
/* Reject the loopback device */
1803
if(ifr->ifr_flags & IFF_LOOPBACK){
1804
if(debug){
1805
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1806
ifname);
1807
}
1808
return false;
1809
}
1810
/* Accept point-to-point devices only if connect_to is specified */
1811
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1812
if(debug){
1813
fprintf_plus(stderr, "Accepting point-to-point interface"
1814
" \"%s\"\n", ifname);
1815
}
1816
return true;
1817
}
1818
/* Otherwise, reject non-broadcast-capable devices */
1819
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1820
if(debug){
1821
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1822
" \"%s\"\n", ifname);
1823
}
1824
return false;
1825
}
1826
/* Reject non-ARP interfaces (including dummy interfaces) */
1827
if(ifr->ifr_flags & IFF_NOARP){
1828
if(debug){
1829
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1830
ifname);
1831
}
1832
return false;
1833
}
1834
1835
/* Accept this device */
1836
if(debug){
1837
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1838
}
1839
return true;
1840
}
1841
1842
/*
1843
* This function determines if a directory entry in /sys/class/net
1844
* corresponds to an acceptable network device.
1845
* (This function is passed to scandir(3) as a filter function.)
1846
*/
1847
__attribute__((nonnull, warn_unused_result))
1848
int good_interface(const struct dirent *if_entry){
1849
if(if_entry->d_name[0] == '.'){
1850
return 0;
1851
}
1852
1853
struct ifreq ifr;
1854
if(not get_flags(if_entry->d_name, &ifr)){
1855
if(debug){
1856
fprintf_plus(stderr, "Failed to get flags for interface "
1857
"\"%s\"\n", if_entry->d_name);
1858
}
1859
return 0;
1860
}
1861
1862
if(not good_flags(if_entry->d_name, &ifr)){
1863
return 0;
1864
}
1865
return 1;
1866
}
1867
1868
/*
1869
* This function determines if a network interface is up.
1870
*/
1871
__attribute__((nonnull, warn_unused_result))
1872
bool interface_is_up(const char *interface){
1873
struct ifreq ifr;
1874
if(not get_flags(interface, &ifr)){
1875
if(debug){
1876
fprintf_plus(stderr, "Failed to get flags for interface "
1877
"\"%s\"\n", interface);
1878
}
1879
return false;
1880
}
1881
1882
return (bool)(ifr.ifr_flags & IFF_UP);
1883
}
1884
1885
/*
1886
* This function determines if a network interface is running
1887
*/
1888
__attribute__((nonnull, warn_unused_result))
1889
bool interface_is_running(const char *interface){
1890
struct ifreq ifr;
1891
if(not get_flags(interface, &ifr)){
1892
if(debug){
1893
fprintf_plus(stderr, "Failed to get flags for interface "
1894
"\"%s\"\n", interface);
1895
}
1896
return false;
1897
}
1898
1899
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1900
}
1901
1902
__attribute__((nonnull, pure, warn_unused_result))
1903
int notdotentries(const struct dirent *direntry){
1904
/* Skip "." and ".." */
1905
if(direntry->d_name[0] == '.'
1906
and (direntry->d_name[1] == '\0'
1907
or (direntry->d_name[1] == '.'
1908
and direntry->d_name[2] == '\0'))){
1909
return 0;
1910
}
1911
return 1;
1912
}
1913
1914
/* Is this directory entry a runnable program? */
1915
__attribute__((nonnull, warn_unused_result))
1916
int runnable_hook(const struct dirent *direntry){
1917
int ret;
1918
size_t sret;
1919
struct stat st;
1920
1921
if((direntry->d_name)[0] == '\0'){
1922
/* Empty name? */
1923
return 0;
1924
}
1925
1926
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1927
"abcdefghijklmnopqrstuvwxyz"
1928
"0123456789"
1929
"_.-");
1930
if((direntry->d_name)[sret] != '\0'){
1931
/* Contains non-allowed characters */
1932
if(debug){
1933
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1934
direntry->d_name);
1935
}
1936
return 0;
1937
}
1938
1939
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1940
if(ret == -1){
1941
if(debug){
1942
perror_plus("Could not stat hook");
1943
}
1944
return 0;
1945
}
1946
if(not (S_ISREG(st.st_mode))){
1947
/* Not a regular file */
1948
if(debug){
1949
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1950
direntry->d_name);
1951
}
1952
return 0;
1953
}
1954
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1955
/* Not executable */
1956
if(debug){
1957
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1958
direntry->d_name);
1959
}
1960
return 0;
1961
}
1962
if(debug){
1963
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1964
direntry->d_name);
1965
}
1966
return 1;
1967
}
1968
1969
__attribute__((nonnull, warn_unused_result))
1970
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1971
mandos_context *mc){
1972
int ret;
1973
struct timespec now;
1974
struct timespec waited_time;
1975
intmax_t block_time;
1976
1977
while(true){
1978
if(mc->current_server == NULL){
1979
if(debug){
1980
fprintf_plus(stderr, "Wait until first server is found."
1981
" No timeout!\n");
1982
}
1983
ret = avahi_simple_poll_iterate(s, -1);
1984
} else {
1985
if(debug){
1986
fprintf_plus(stderr, "Check current_server if we should run"
1987
" it, or wait\n");
1988
}
1989
/* the current time */
1990
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1991
if(ret == -1){
1992
perror_plus("clock_gettime");
1993
return -1;
1994
}
1995
/* Calculating in ms how long time between now and server
1996
who we visted longest time ago. Now - last seen. */
1997
waited_time.tv_sec = (now.tv_sec
1998
- mc->current_server->last_seen.tv_sec);
1999
waited_time.tv_nsec = (now.tv_nsec
2000
- mc->current_server->last_seen.tv_nsec);
2001
/* total time is 10s/10,000ms.
2002
Converting to s from ms by dividing by 1,000,
2003
and ns to ms by dividing by 1,000,000. */
2004
block_time = ((retry_interval
2005
- ((intmax_t)waited_time.tv_sec * 1000))
2006
- ((intmax_t)waited_time.tv_nsec / 1000000));
2007
2008
if(debug){
2009
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2010
block_time);
2011
}
2012
2013
if(block_time <= 0){
2014
ret = start_mandos_communication(mc->current_server->ip,
2015
mc->current_server->port,
2016
mc->current_server->if_index,
2017
mc->current_server->af, mc);
2018
if(ret == 0){
2019
avahi_simple_poll_quit(s);
2020
return 0;
2021
}
2022
ret = clock_gettime(CLOCK_MONOTONIC,
2023
&mc->current_server->last_seen);
2024
if(ret == -1){
2025
perror_plus("clock_gettime");
2026
return -1;
2027
}
2028
mc->current_server = mc->current_server->next;
2029
block_time = 0; /* Call avahi to find new Mandos
2030
servers, but don't block */
2031
}
2032
2033
ret = avahi_simple_poll_iterate(s, (int)block_time);
2034
}
2035
if(ret != 0){
2036
if(ret > 0 or errno != EINTR){
2037
return (ret != 1) ? ret : 0;
2038
}
2039
}
2040
}
2041
}
2042
2043
__attribute__((nonnull))
2044
void run_network_hooks(const char *mode, const char *interface,
2045
const float delay){
2046
struct dirent **direntries = NULL;
2047
if(hookdir_fd == -1){
2048
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2049
| O_CLOEXEC);
2050
if(hookdir_fd == -1){
2051
if(errno == ENOENT){
2052
if(debug){
2053
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2054
" found\n", hookdir);
2055
}
2056
} else {
2057
perror_plus("open");
2058
}
2059
return;
2060
}
2061
}
2062
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2063
if(devnull == -1){
2064
perror_plus("open(\"/dev/null\", O_RDONLY)");
2065
return;
2066
}
2067
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2068
runnable_hook, alphasort);
2069
if(numhooks == -1){
2070
perror_plus("scandir");
2071
close(devnull);
2072
return;
2073
}
2074
struct dirent *direntry;
2075
int ret;
2076
for(int i = 0; i < numhooks; i++){
2077
direntry = direntries[i];
2078
if(debug){
2079
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2080
direntry->d_name);
2081
}
2082
pid_t hook_pid = fork();
2083
if(hook_pid == 0){
2084
/* Child */
2085
/* Raise privileges */
2086
errno = raise_privileges_permanently();
2087
if(errno != 0){
2088
perror_plus("Failed to raise privileges");
2089
_exit(EX_NOPERM);
2090
}
2091
/* Set group */
2092
errno = 0;
2093
ret = setgid(0);
2094
if(ret == -1){
2095
perror_plus("setgid");
2096
_exit(EX_NOPERM);
2097
}
2098
/* Reset supplementary groups */
2099
errno = 0;
2100
ret = setgroups(0, NULL);
2101
if(ret == -1){
2102
perror_plus("setgroups");
2103
_exit(EX_NOPERM);
2104
}
2105
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2106
if(ret == -1){
2107
perror_plus("setenv");
2108
_exit(EX_OSERR);
2109
}
2110
ret = setenv("DEVICE", interface, 1);
2111
if(ret == -1){
2112
perror_plus("setenv");
2113
_exit(EX_OSERR);
2114
}
2115
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2116
if(ret == -1){
2117
perror_plus("setenv");
2118
_exit(EX_OSERR);
2119
}
2120
ret = setenv("MODE", mode, 1);
2121
if(ret == -1){
2122
perror_plus("setenv");
2123
_exit(EX_OSERR);
2124
}
2125
char *delaystring;
2126
ret = asprintf(&delaystring, "%f", (double)delay);
2127
if(ret == -1){
2128
perror_plus("asprintf");
2129
_exit(EX_OSERR);
2130
}
2131
ret = setenv("DELAY", delaystring, 1);
2132
if(ret == -1){
2133
free(delaystring);
2134
perror_plus("setenv");
2135
_exit(EX_OSERR);
2136
}
2137
free(delaystring);
2138
if(connect_to != NULL){
2139
ret = setenv("CONNECT", connect_to, 1);
2140
if(ret == -1){
2141
perror_plus("setenv");
2142
_exit(EX_OSERR);
2143
}
2144
}
2145
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2146
direntry->d_name,
2147
O_RDONLY));
2148
if(hook_fd == -1){
2149
perror_plus("openat");
2150
_exit(EXIT_FAILURE);
2151
}
2152
if(close(hookdir_fd) == -1){
2153
perror_plus("close");
2154
_exit(EXIT_FAILURE);
2155
}
2156
ret = dup2(devnull, STDIN_FILENO);
2157
if(ret == -1){
2158
perror_plus("dup2(devnull, STDIN_FILENO)");
2159
_exit(EX_OSERR);
2160
}
2161
ret = close(devnull);
2162
if(ret == -1){
2163
perror_plus("close");
2164
_exit(EX_OSERR);
2165
}
2166
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2167
if(ret == -1){
2168
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2169
_exit(EX_OSERR);
2170
}
2171
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2172
environ) == -1){
2173
perror_plus("fexecve");
2174
_exit(EXIT_FAILURE);
2175
}
2176
} else {
2177
if(hook_pid == -1){
2178
perror_plus("fork");
2179
free(direntry);
2180
continue;
2181
}
2182
int status;
2183
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2184
perror_plus("waitpid");
2185
free(direntry);
2186
continue;
2187
}
2188
if(WIFEXITED(status)){
2189
if(WEXITSTATUS(status) != 0){
2190
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2191
" with status %d\n", direntry->d_name,
2192
WEXITSTATUS(status));
2193
free(direntry);
2194
continue;
2195
}
2196
} else if(WIFSIGNALED(status)){
2197
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2198
" signal %d\n", direntry->d_name,
2199
WTERMSIG(status));
2200
free(direntry);
2201
continue;
2202
} else {
2203
fprintf_plus(stderr, "Warning: network hook \"%s\""
2204
" crashed\n", direntry->d_name);
2205
free(direntry);
2206
continue;
2207
}
2208
}
2209
if(debug){
2210
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2211
direntry->d_name);
2212
}
2213
free(direntry);
2214
}
2215
free(direntries);
2216
if(close(hookdir_fd) == -1){
2217
perror_plus("close");
2218
} else {
2219
hookdir_fd = -1;
2220
}
2221
close(devnull);
2222
}
2223
2224
__attribute__((nonnull, warn_unused_result))
2225
int bring_up_interface(const char *const interface,
2226
const float delay){
2227
int old_errno = errno;
2228
int ret;
2229
struct ifreq network;
2230
unsigned int if_index = if_nametoindex(interface);
2231
if(if_index == 0){
2232
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2233
errno = old_errno;
2234
return ENXIO;
2235
}
2236
2237
if(quit_now){
2238
errno = old_errno;
2239
return EINTR;
2240
}
2241
2242
if(not interface_is_up(interface)){
2243
int ret_errno = 0;
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network)){
2246
ret_errno = errno;
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2249
errno = old_errno;
2250
return ret_errno;
2251
}
2252
network.ifr_flags |= IFF_UP; /* set flag */
2253
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2255
if(sd == -1){
2256
ret_errno = errno;
2257
perror_plus("socket");
2258
errno = old_errno;
2259
return ret_errno;
2260
}
2261
2262
if(quit_now){
2263
ret = close(sd);
2264
if(ret == -1){
2265
perror_plus("close");
2266
}
2267
errno = old_errno;
2268
return EINTR;
2269
}
2270
2271
if(debug){
2272
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2273
interface);
2274
}
2275
2276
/* Raise privileges */
2277
ret_errno = raise_privileges();
2278
if(ret_errno != 0){
2279
errno = ret_errno;
2280
perror_plus("Failed to raise privileges");
2281
}
2282
2283
#ifdef __linux__
2284
int ret_linux;
2285
bool restore_loglevel = false;
2286
if(ret_errno == 0){
2287
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2288
messages about the network interface to mess up the prompt */
2289
ret_linux = klogctl(8, NULL, 5);
2290
if(ret_linux == -1){
2291
perror_plus("klogctl");
2292
} else {
2293
restore_loglevel = true;
2294
}
2295
}
2296
#endif /* __linux__ */
2297
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2298
ioctl_errno = errno;
2299
#ifdef __linux__
2300
if(restore_loglevel){
2301
ret_linux = klogctl(7, NULL, 0);
2302
if(ret_linux == -1){
2303
perror_plus("klogctl");
2304
}
2305
}
2306
#endif /* __linux__ */
2307
2308
/* If raise_privileges() succeeded above */
2309
if(ret_errno == 0){
2310
/* Lower privileges */
2311
ret_errno = lower_privileges();
2312
if(ret_errno != 0){
2313
errno = ret_errno;
2314
perror_plus("Failed to lower privileges");
2315
}
2316
}
2317
2318
/* Close the socket */
2319
ret = close(sd);
2320
if(ret == -1){
2321
perror_plus("close");
2322
}
2323
2324
if(ret_setflags == -1){
2325
errno = ioctl_errno;
2326
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2327
errno = old_errno;
2328
return ioctl_errno;
2329
}
2330
} else if(debug){
2331
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2332
interface);
2333
}
2334
2335
/* Sleep checking until interface is running.
2336
Check every 0.25s, up to total time of delay */
2337
for(int i = 0; i < delay * 4; i++){
2338
if(interface_is_running(interface)){
2339
break;
2340
}
2341
struct timespec sleeptime = { .tv_nsec = 250000000 };
2342
ret = nanosleep(&sleeptime, NULL);
2343
if(ret == -1 and errno != EINTR){
2344
perror_plus("nanosleep");
2345
}
2346
}
2347
2348
errno = old_errno;
2349
return 0;
2350
}
2351
2352
__attribute__((nonnull, warn_unused_result))
2353
int take_down_interface(const char *const interface){
2354
int old_errno = errno;
2355
struct ifreq network;
2356
unsigned int if_index = if_nametoindex(interface);
2357
if(if_index == 0){
2358
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2359
errno = old_errno;
2360
return ENXIO;
2361
}
2362
if(interface_is_up(interface)){
2363
int ret_errno = 0;
2364
int ioctl_errno = 0;
2365
if(not get_flags(interface, &network) and debug){
2366
ret_errno = errno;
2367
fprintf_plus(stderr, "Failed to get flags for interface "
2368
"\"%s\"\n", interface);
2369
errno = old_errno;
2370
return ret_errno;
2371
}
2372
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2373
2374
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2375
if(sd == -1){
2376
ret_errno = errno;
2377
perror_plus("socket");
2378
errno = old_errno;
2379
return ret_errno;
2380
}
2381
2382
if(debug){
2383
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2384
interface);
2385
}
2386
2387
/* Raise privileges */
2388
ret_errno = raise_privileges();
2389
if(ret_errno != 0){
2390
errno = ret_errno;
2391
perror_plus("Failed to raise privileges");
2392
}
2393
2394
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2395
ioctl_errno = errno;
2396
2397
/* If raise_privileges() succeeded above */
2398
if(ret_errno == 0){
2399
/* Lower privileges */
2400
ret_errno = lower_privileges();
2401
if(ret_errno != 0){
2402
errno = ret_errno;
2403
perror_plus("Failed to lower privileges");
2404
}
2405
}
2406
2407
/* Close the socket */
2408
int ret = close(sd);
2409
if(ret == -1){
2410
perror_plus("close");
2411
}
2412
2413
if(ret_setflags == -1){
2414
errno = ioctl_errno;
2415
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2416
errno = old_errno;
2417
return ioctl_errno;
2418
}
2419
} else if(debug){
2420
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2421
interface);
2422
}
2423
2424
errno = old_errno;
2425
return 0;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
2426
977
}
2427
978
2428
979
int main(int argc, char *argv[]){
2429
mandos_context mc = { .server = NULL, .dh_bits = 0,
2430
.priority = "SECURE256:!CTYPE-X.509"
2431
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2432
.current_server = NULL, .interfaces = NULL,
2433
.interfaces_size = 0 };
2434
980
AvahiSServiceBrowser *sb = NULL;
2435
error_t ret_errno;
981
int error;
2436
982
int ret;
2437
983
intmax_t tmpmax;
2438
984
char *tmp;
2439
985
int exitcode = EXIT_SUCCESS;
2440
char *interfaces_to_take_down = NULL;
2441
size_t interfaces_to_take_down_size = 0;
2442
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2443
char old_tempdir[] = "/tmp/mandosXXXXXX";
2444
char *tempdir = NULL;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
2445
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2446
996
const char *seckey = PATHDIR "/" SECKEY;
2447
997
const char *pubkey = PATHDIR "/" PUBKEY;
2448
const char *dh_params_file = NULL;
2449
char *interfaces_hooks = NULL;
2450
998
2451
999
bool gnutls_initialized = false;
2452
1000
bool gpgme_initialized = false;
2453
1001
float delay = 2.5f;
2454
double retry_interval = 10; /* 10s between trying a server and
2455
retrying the same server again */
2456
1002
2457
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2458
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2464
1010
errno = 0;
2465
1011
ret = setgid(gid);
2466
1012
if(ret == -1){
2467
perror_plus("setgid");
1013
perror("setgid");
2468
1014
}
2469
1015
2470
1016
/* Lower user privileges (temporarily) */
2471
1017
errno = 0;
2472
1018
ret = seteuid(uid);
2473
1019
if(ret == -1){
2474
perror_plus("seteuid");
1020
perror("seteuid");
2475
1021
}
2476
1022
2477
1023
if(quit_now){
2504
1050
.doc = "Bit length of the prime number used in the"
2505
1051
" Diffie-Hellman key exchange",
2506
1052
.group = 2 },
2507
{ .name = "dh-params", .key = 134,
2508
.arg = "FILE",
2509
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2510
" for the Diffie-Hellman key exchange",
2511
.group = 2 },
2512
1053
{ .name = "priority", .key = 130,
2513
1054
.arg = "STRING",
2514
1055
.doc = "GnuTLS priority string for the TLS handshake",
2517
1058
.arg = "SECONDS",
2518
1059
.doc = "Maximum delay to wait for interface startup",
2519
1060
.group = 2 },
2520
{ .name = "retry", .key = 132,
2521
.arg = "SECONDS",
2522
.doc = "Retry interval used when denied by the Mandos server",
2523
.group = 2 },
2524
{ .name = "network-hook-dir", .key = 133,
2525
.arg = "DIR",
2526
.doc = "Directory where network hooks are located",
2527
.group = 2 },
2528
/*
2529
* These reproduce what we would get without ARGP_NO_HELP
2530
*/
2531
{ .name = "help", .key = '?',
2532
.doc = "Give this help list", .group = -1 },
2533
{ .name = "usage", .key = -3,
2534
.doc = "Give a short usage message", .group = -1 },
2535
{ .name = "version", .key = 'V',
2536
.doc = "Print program version", .group = -1 },
2537
1061
{ .name = NULL }
2538
1062
};
2539
1063
2540
1064
error_t parse_opt(int key, char *arg,
2541
1065
struct argp_state *state){
2542
errno = 0;
2543
1066
switch(key){
2544
1067
case 128: /* --debug */
2545
1068
debug = true;
2548
1071
connect_to = arg;
2549
1072
break;
2550
1073
case 'i': /* --interface */
2551
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2552
arg, (int)',');
2553
if(ret_errno != 0){
2554
argp_error(state, "%s", strerror(ret_errno));
2555
}
1074
interface = arg;
2556
1075
break;
2557
1076
case 's': /* --seckey */
2558
1077
seckey = arg;
2565
1084
tmpmax = strtoimax(arg, &tmp, 10);
2566
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
2567
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2568
argp_error(state, "Bad number of DH bits");
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
2569
1089
}
2570
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2571
1091
break;
2572
case 134: /* --dh-params */
2573
dh_params_file = arg;
2574
break;
2575
1092
case 130: /* --priority */
2576
1093
mc.priority = arg;
2577
1094
break;
2579
1096
errno = 0;
2580
1097
delay = strtof(arg, &tmp);
2581
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
2582
argp_error(state, "Bad delay");
2583
}
2584
case 132: /* --retry */
2585
errno = 0;
2586
retry_interval = strtod(arg, &tmp);
2587
if(errno != 0 or tmp == arg or *tmp != '\0'
2588
or (retry_interval * 1000) > INT_MAX
2589
or retry_interval < 0){
2590
argp_error(state, "Bad retry interval");
2591
}
2592
break;
2593
case 133: /* --network-hook-dir */
2594
hookdir = arg;
2595
break;
2596
/*
2597
* These reproduce what we would get without ARGP_NO_HELP
2598
*/
2599
case '?': /* --help */
2600
argp_state_help(state, state->out_stream,
2601
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2602
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2603
case -3: /* --usage */
2604
argp_state_help(state, state->out_stream,
2605
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2606
case 'V': /* --version */
2607
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2608
exit(argp_err_exit_status);
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
2609
1106
break;
2610
1107
default:
2611
1108
return ARGP_ERR_UNKNOWN;
2612
1109
}
2613
return errno;
1110
return 0;
2614
1111
}
2615
1112
2616
1113
struct argp argp = { .options = options, .parser = parse_opt,
2617
1114
.args_doc = "",
2618
1115
.doc = "Mandos client -- Get and decrypt"
2619
1116
" passwords from a Mandos server" };
2620
ret_errno = argp_parse(&argp, argc, argv,
2621
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2622
switch(ret_errno){
2623
case 0:
2624
break;
2625
case ENOMEM:
2626
default:
2627
errno = ret_errno;
2628
perror_plus("argp_parse");
2629
exitcode = EX_OSERR;
2630
goto end;
2631
case EINVAL:
2632
exitcode = EX_USAGE;
2633
goto end;
2634
}
2635
}
2636
2637
{
2638
/* Work around Debian bug #633582:
2639
<https://bugs.debian.org/633582> */
2640
2641
/* Re-raise privileges */
2642
ret = raise_privileges();
2643
if(ret != 0){
2644
errno = ret;
2645
perror_plus("Failed to raise privileges");
2646
} else {
2647
struct stat st;
2648
2649
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2650
int seckey_fd = open(seckey, O_RDONLY);
2651
if(seckey_fd == -1){
2652
perror_plus("open");
2653
} else {
2654
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2655
if(ret == -1){
2656
perror_plus("fstat");
2657
} else {
2658
if(S_ISREG(st.st_mode)
2659
and st.st_uid == 0 and st.st_gid == 0){
2660
ret = fchown(seckey_fd, uid, gid);
2661
if(ret == -1){
2662
perror_plus("fchown");
2663
}
2664
}
2665
}
2666
close(seckey_fd);
2667
}
2668
}
2669
2670
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2671
int pubkey_fd = open(pubkey, O_RDONLY);
2672
if(pubkey_fd == -1){
2673
perror_plus("open");
2674
} else {
2675
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2676
if(ret == -1){
2677
perror_plus("fstat");
2678
} else {
2679
if(S_ISREG(st.st_mode)
2680
and st.st_uid == 0 and st.st_gid == 0){
2681
ret = fchown(pubkey_fd, uid, gid);
2682
if(ret == -1){
2683
perror_plus("fchown");
2684
}
2685
}
2686
}
2687
close(pubkey_fd);
2688
}
2689
}
2690
2691
if(dh_params_file != NULL
2692
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2693
int dhparams_fd = open(dh_params_file, O_RDONLY);
2694
if(dhparams_fd == -1){
2695
perror_plus("open");
2696
} else {
2697
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2698
if(ret == -1){
2699
perror_plus("fstat");
2700
} else {
2701
if(S_ISREG(st.st_mode)
2702
and st.st_uid == 0 and st.st_gid == 0){
2703
ret = fchown(dhparams_fd, uid, gid);
2704
if(ret == -1){
2705
perror_plus("fchown");
2706
}
2707
}
2708
}
2709
close(dhparams_fd);
2710
}
2711
}
2712
2713
/* Lower privileges */
2714
ret = lower_privileges();
2715
if(ret != 0){
2716
errno = ret;
2717
perror_plus("Failed to lower privileges");
2718
}
2719
}
2720
}
2721
2722
/* Remove invalid interface names (except "none") */
2723
{
2724
char *interface = NULL;
2725
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2726
interface))){
2727
if(strcmp(interface, "none") != 0
2728
and if_nametoindex(interface) == 0){
2729
if(interface[0] != '\0'){
2730
fprintf_plus(stderr, "Not using nonexisting interface"
2731
" \"%s\"\n", interface);
2732
}
2733
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2734
interface = NULL;
2735
}
2736
}
2737
}
2738
2739
/* Run network hooks */
2740
{
2741
if(mc.interfaces != NULL){
2742
interfaces_hooks = malloc(mc.interfaces_size);
2743
if(interfaces_hooks == NULL){
2744
perror_plus("malloc");
2745
goto end;
2746
}
2747
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2748
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2749
}
2750
run_network_hooks("start", interfaces_hooks != NULL ?
2751
interfaces_hooks : "", delay);
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
2752
1123
}
2753
1124
2754
1125
if(not debug){
2759
1130
from the signal handler */
2760
1131
/* Initialize the pseudo-RNG for Avahi */
2761
1132
srand((unsigned int) time(NULL));
2762
simple_poll = avahi_simple_poll_new();
2763
if(simple_poll == NULL){
2764
fprintf_plus(stderr,
2765
"Avahi: Failed to create simple poll object.\n");
2766
exitcode = EX_UNAVAILABLE;
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
2767
1137
goto end;
2768
1138
}
2769
1139
2770
1140
sigemptyset(&sigterm_action.sa_mask);
2771
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2772
1142
if(ret == -1){
2773
perror_plus("sigaddset");
2774
exitcode = EX_OSERR;
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
2775
1145
goto end;
2776
1146
}
2777
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2778
1148
if(ret == -1){
2779
perror_plus("sigaddset");
2780
exitcode = EX_OSERR;
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
2781
1151
goto end;
2782
1152
}
2783
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2784
1154
if(ret == -1){
2785
perror_plus("sigaddset");
2786
exitcode = EX_OSERR;
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
2787
1157
goto end;
2788
1158
}
2789
1159
/* Need to check if the handler is SIG_IGN before handling:
2792
1162
*/
2793
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2794
1164
if(ret == -1){
2795
perror_plus("sigaction");
2796
return EX_OSERR;
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2797
1167
}
2798
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2799
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
2800
1170
if(ret == -1){
2801
perror_plus("sigaction");
2802
exitcode = EX_OSERR;
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
2803
1173
goto end;
2804
1174
}
2805
1175
}
2806
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2807
1177
if(ret == -1){
2808
perror_plus("sigaction");
2809
return EX_OSERR;
1178
perror("sigaction");
1179
return EXIT_FAILURE;
2810
1180
}
2811
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
2812
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2813
1183
if(ret == -1){
2814
perror_plus("sigaction");
2815
exitcode = EX_OSERR;
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
2816
1186
goto end;
2817
1187
}
2818
1188
}
2819
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2820
1190
if(ret == -1){
2821
perror_plus("sigaction");
2822
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2823
1193
}
2824
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2825
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2826
1196
if(ret == -1){
2827
perror_plus("sigaction");
2828
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2829
1199
goto end;
2830
1200
}
2831
1201
}
2832
1202
2833
/* If no interfaces were specified, make a list */
2834
if(mc.interfaces == NULL){
2835
struct dirent **direntries = NULL;
2836
/* Look for any good interfaces */
2837
ret = scandir(sys_class_net, &direntries, good_interface,
2838
alphasort);
2839
if(ret >= 1){
2840
/* Add all found interfaces to interfaces list */
2841
for(int i = 0; i < ret; ++i){
2842
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2843
direntries[i]->d_name);
2844
if(ret_errno != 0){
2845
errno = ret_errno;
2846
perror_plus("argz_add");
2847
free(direntries[i]);
2848
continue;
2849
}
2850
if(debug){
2851
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2852
direntries[i]->d_name);
2853
}
2854
free(direntries[i]);
2855
}
2856
free(direntries);
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
2857
1338
} else {
2858
if(ret == 0){
2859
free(direntries);
2860
}
2861
fprintf_plus(stderr, "Could not find a network interface\n");
2862
exitcode = EXIT_FAILURE;
2863
goto end;
2864
}
2865
}
2866
2867
/* Bring up interfaces which are down, and remove any "none"s */
2868
{
2869
char *interface = NULL;
2870
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2871
interface))){
2872
/* If interface name is "none", stop bringing up interfaces.
2873
Also remove all instances of "none" from the list */
2874
if(strcmp(interface, "none") == 0){
2875
argz_delete(&mc.interfaces, &mc.interfaces_size,
2876
interface);
2877
interface = NULL;
2878
while((interface = argz_next(mc.interfaces,
2879
mc.interfaces_size, interface))){
2880
if(strcmp(interface, "none") == 0){
2881
argz_delete(&mc.interfaces, &mc.interfaces_size,
2882
interface);
2883
interface = NULL;
2884
}
2885
}
2886
break;
2887
}
2888
bool interface_was_up = interface_is_up(interface);
2889
errno = bring_up_interface(interface, delay);
2890
if(not interface_was_up){
2891
if(errno != 0){
2892
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2893
" %s\n", interface, strerror(errno));
2894
} else {
2895
errno = argz_add(&interfaces_to_take_down,
2896
&interfaces_to_take_down_size,
2897
interface);
2898
if(errno != 0){
2899
perror_plus("argz_add");
2900
}
2901
}
2902
}
2903
}
2904
if(debug and (interfaces_to_take_down == NULL)){
2905
fprintf_plus(stderr, "No interfaces were brought up\n");
2906
}
2907
}
2908
2909
/* If we only got one interface, explicitly use only that one */
2910
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2911
if(debug){
2912
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2913
mc.interfaces);
2914
}
2915
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
2916
1345
}
2917
1346
2918
1347
if(quit_now){
2919
1348
goto end;
2920
1349
}
2921
1350
2922
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1351
ret = init_gnutls_global(pubkey, seckey);
2923
1352
if(ret == -1){
2924
fprintf_plus(stderr, "init_gnutls_global failed\n");
2925
exitcode = EX_UNAVAILABLE;
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
2926
1355
goto end;
2927
1356
} else {
2928
1357
gnutls_initialized = true;
2932
1361
goto end;
2933
1362
}
2934
1363
2935
/* Try /run/tmp before /tmp */
2936
tempdir = mkdtemp(run_tempdir);
2937
if(tempdir == NULL and errno == ENOENT){
2938
if(debug){
2939
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2940
run_tempdir, old_tempdir);
2941
}
2942
tempdir = mkdtemp(old_tempdir);
2943
}
2944
if(tempdir == NULL){
2945
perror_plus("mkdtemp");
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
2946
1368
goto end;
2947
1369
}
2948
1370
2950
1372
goto end;
2951
1373
}
2952
1374
2953
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2954
fprintf_plus(stderr, "init_gpgme failed\n");
2955
exitcode = EX_UNAVAILABLE;
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
2956
1378
goto end;
2957
1379
} else {
2958
1380
gpgme_initialized = true;
2966
1388
/* Connect directly, do not use Zeroconf */
2967
1389
/* (Mainly meant for debugging) */
2968
1390
char *address = strrchr(connect_to, ':');
2969
2970
1391
if(address == NULL){
2971
fprintf_plus(stderr, "No colon in address\n");
2972
exitcode = EX_USAGE;
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
2973
1394
goto end;
2974
1395
}
2975
1396
2977
1398
goto end;
2978
1399
}
2979
1400
2980
in_port_t port;
1401
uint16_t port;
2981
1402
errno = 0;
2982
1403
tmpmax = strtoimax(address+1, &tmp, 10);
2983
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2984
or tmpmax != (in_port_t)tmpmax){
2985
fprintf_plus(stderr, "Bad port number\n");
2986
exitcode = EX_USAGE;
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
2987
1408
goto end;
2988
1409
}
2989
1410
2990
1411
if(quit_now){
2991
1412
goto end;
2992
1413
}
2993
1414
2994
port = (in_port_t)tmpmax;
1415
port = (uint16_t)tmpmax;
2995
1416
*address = '\0';
1417
address = connect_to;
2996
1418
/* Colon in address indicates IPv6 */
2997
1419
int af;
2998
if(strchr(connect_to, ':') != NULL){
1420
if(strchr(address, ':') != NULL){
2999
1421
af = AF_INET6;
3000
/* Accept [] around IPv6 address - see RFC 5952 */
3001
if(connect_to[0] == '[' and address[-1] == ']')
3002
{
3003
connect_to++;
3004
address[-1] = '\0';
3005
}
3006
1422
} else {
3007
1423
af = AF_INET;
3008
1424
}
3009
address = connect_to;
3010
1425
3011
1426
if(quit_now){
3012
1427
goto end;
3013
1428
}
3014
1429
3015
while(not quit_now){
3016
ret = start_mandos_communication(address, port, if_index, af,
3017
&mc);
3018
if(quit_now or ret == 0){
3019
break;
3020
}
3021
if(debug){
3022
fprintf_plus(stderr, "Retrying in %d seconds\n",
3023
(int)retry_interval);
3024
}
3025
sleep((unsigned int)retry_interval);
3026
}
3027
3028
if(not quit_now){
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
3029
1434
exitcode = EXIT_SUCCESS;
3030
1435
}
3031
3032
1436
goto end;
3033
1437
}
3034
1438
3046
1450
config.publish_domain = 0;
3047
1451
3048
1452
/* Allocate a new server */
3049
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3050
&config, NULL, NULL, &ret);
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
3051
1456
3052
1457
/* Free the Avahi configuration data */
3053
1458
avahi_server_config_free(&config);
3055
1460
3056
1461
/* Check if creating the Avahi server object succeeded */
3057
1462
if(mc.server == NULL){
3058
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3059
avahi_strerror(ret));
3060
exitcode = EX_UNAVAILABLE;
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
3061
1466
goto end;
3062
1467
}
3063
1468
3068
1473
/* Create the Avahi service browser */
3069
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
3070
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3071
NULL, 0, browse_callback,
3072
(void *)&mc);
1476
NULL, 0, browse_callback, NULL);
3073
1477
if(sb == NULL){
3074
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3075
avahi_strerror(avahi_server_errno(mc.server)));
3076
exitcode = EX_UNAVAILABLE;
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
3077
1481
goto end;
3078
1482
}
3079
1483
3084
1488
/* Run the main loop */
3085
1489
3086
1490
if(debug){
3087
fprintf_plus(stderr, "Starting Avahi loop search\n");
1491
fprintf(stderr, "Starting Avahi loop search\n");
3088
1492
}
3089
1493
3090
ret = avahi_loop_with_timeout(simple_poll,
3091
(int)(retry_interval * 1000), &mc);
3092
if(debug){
3093
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3094
(ret == 0) ? "successfully" : "with error");
3095
}
1494
avahi_simple_poll_loop(mc.simple_poll);
3096
1495
3097
1496
end:
3098
1497
3099
1498
if(debug){
3100
if(signal_received){
3101
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3102
argv[0], signal_received,
3103
strsignal(signal_received));
3104
} else {
3105
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3106
}
1499
fprintf(stderr, "%s exiting\n", argv[0]);
3107
1500
}
3108
1501
3109
1502
/* Cleanup things */
3110
free(mc.interfaces);
3111
3112
1503
if(sb != NULL)
3113
1504
avahi_s_service_browser_free(sb);
3114
1505
3115
1506
if(mc.server != NULL)
3116
1507
avahi_server_free(mc.server);
3117
1508
3118
if(simple_poll != NULL)
3119
avahi_simple_poll_free(simple_poll);
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
3120
1511
3121
1512
if(gnutls_initialized){
3122
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
3123
1515
gnutls_dh_params_deinit(mc.dh_params);
3124
1516
}
3125
1517
3127
1519
gpgme_release(mc.ctx);
3128
1520
}
3129
1521
3130
/* Cleans up the circular linked list of Mandos servers the client
3131
has seen */
3132
if(mc.current_server != NULL){
3133
mc.current_server->prev->next = NULL;
3134
while(mc.current_server != NULL){
3135
server *next = mc.current_server->next;
3136
#ifdef __GNUC__
3137
#pragma GCC diagnostic push
3138
#pragma GCC diagnostic ignored "-Wcast-qual"
3139
#endif
3140
free((char *)(mc.current_server->ip));
3141
#ifdef __GNUC__
3142
#pragma GCC diagnostic pop
3143
#endif
3144
free(mc.current_server);
3145
mc.current_server = next;
3146
}
3147
}
3148
3149
/* Re-raise privileges */
3150
{
3151
ret = raise_privileges();
3152
if(ret != 0){
3153
errno = ret;
3154
perror_plus("Failed to raise privileges");
3155
} else {
3156
3157
/* Run network hooks */
3158
run_network_hooks("stop", interfaces_hooks != NULL ?
3159
interfaces_hooks : "", delay);
3160
3161
/* Take down the network interfaces which were brought up */
3162
{
3163
char *interface = NULL;
3164
while((interface = argz_next(interfaces_to_take_down,
3165
interfaces_to_take_down_size,
3166
interface))){
3167
ret = take_down_interface(interface);
3168
if(ret != 0){
3169
errno = ret;
3170
perror_plus("Failed to take down interface");
3171
}
3172
}
3173
if(debug and (interfaces_to_take_down == NULL)){
3174
fprintf_plus(stderr, "No interfaces needed to be taken"
3175
" down\n");
3176
}
3177
}
3178
}
3179
3180
ret = lower_privileges_permanently();
3181
if(ret != 0){
3182
errno = ret;
3183
perror_plus("Failed to lower privileges permanently");
3184
}
3185
}
3186
3187
free(interfaces_to_take_down);
3188
free(interfaces_hooks);
3189
3190
void clean_dir_at(int base, const char * const dirname,
3191
uintmax_t level){
3192
struct dirent **direntries = NULL;
3193
int dret;
3194
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3195
O_RDONLY
3196
| O_NOFOLLOW
3197
| O_DIRECTORY
3198
| O_PATH));
3199
if(dir_fd == -1){
3200
perror_plus("open");
3201
return;
3202
}
3203
int numentries = scandirat(dir_fd, ".", &direntries,
3204
notdotentries, alphasort);
3205
if(numentries >= 0){
3206
for(int i = 0; i < numentries; i++){
3207
if(debug){
3208
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3209
dirname, direntries[i]->d_name);
3210
}
3211
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3212
if(dret == -1){
3213
if(errno == EISDIR){
3214
dret = unlinkat(dir_fd, direntries[i]->d_name,
3215
AT_REMOVEDIR);
3216
}
3217
if((dret == -1) and (errno == ENOTEMPTY)
3218
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3219
== 0) and (level == 0)){
3220
/* Recurse only in this special case */
3221
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3222
dret = 0;
3223
}
3224
if((dret == -1) and (errno != ENOENT)){
3225
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3226
direntries[i]->d_name, strerror(errno));
3227
}
3228
}
3229
free(direntries[i]);
3230
}
3231
3232
/* need to clean even if 0 because man page doesn't specify */
3233
free(direntries);
3234
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3235
if(dret == -1 and errno != ENOENT){
3236
perror_plus("rmdir");
3237
}
3238
} else {
3239
perror_plus("scandirat");
3240
}
3241
close(dir_fd);
3242
}
3243
3244
/* Removes the GPGME temp directory and all files inside */
3245
if(tempdir != NULL){
3246
clean_dir_at(-1, tempdir, 0);
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
3247
1596
}
3248
1597
3249
1598
if(quit_now){
3250
1599
sigemptyset(&old_sigterm_action.sa_mask);
3251
1600
old_sigterm_action.sa_handler = SIG_DFL;
3252
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3253
&old_sigterm_action,
3254
NULL));
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
3255
1602
if(ret == -1){
3256
perror_plus("sigaction");
3257
}
3258
do {
3259
ret = raise(signal_received);
3260
} while(ret != 0 and errno == EINTR);
3261
if(ret != 0){
3262
perror_plus("raise");
3263
abort();
3264
}
3265
TEMP_FAILURE_RETRY(pause());
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
3266
1606
}
3267
1607
3268
1608
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0