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- Committer: Teddy Hogeborn
- Date: 2018-02-22 09:20:19 UTC
- Revision ID: teddy@recompile.se-20180222092019-ehyz79hzti9dnk2g
Client bug fix: Don't use leak sanitizer with leaking libraries
* Makefile (plugin-helpers/mandos-client): Remove "-fsanitize=leak"
from CFLAGS.
* Makefile (plugin-helpers/mandos-client): Remove "-fsanitize=leak"
from CFLAGS.
- files added:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
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* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
*
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
19
*
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
24
26
*
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
28
29
*
29
30
* Contact the authors at <mandos@recompile.se>.
30
31
*/
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
35
#endif
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
38
#endif
39
#endif /* not _FILE_OFFSET_BITS */
39
40
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
stdout, ferror() */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
52
*/
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
55
57
opendir(), DIR */
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
61
getnameinfo() */
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
64
*/
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
66
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
ENOTEMPTY,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
79
*/
74
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
81
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
82
setgid(), pause(), _exit(),
83
unlinkat() */
84
#include <arpa/inet.h> /* inet_pton(), htons() */
78
85
#include <iso646.h> /* not, or, and */
79
86
#include <argp.h> /* struct argp_option, error_t, struct
80
87
argp_state, struct argp,
87
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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() */
90
104
91
105
#ifdef __linux__
92
106
#include <sys/klog.h> /* klogctl() */
110
124
init_gnutls_session(),
111
125
GNUTLS_* */
112
126
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
115
129
116
130
/* GPGME */
117
131
#include <gpgme.h> /* All GPGME types, constants and
134
148
static const char sys_class_net[] = "/sys/class/net";
135
149
char *connect_to = NULL;
136
150
const char *hookdir = HOOKDIR;
151
int hookdir_fd = -1;
152
uid_t uid = 65534;
153
gid_t gid = 65534;
137
154
138
155
/* Doubly linked list that need to be circularly linked when used */
139
156
typedef struct server{
140
157
const char *ip;
141
uint16_t port;
158
in_port_t port;
142
159
AvahiIfIndex if_index;
143
160
int af;
144
161
struct timespec last_seen;
148
165
149
166
/* Used for passing in values through the Avahi callback functions */
150
167
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
168
AvahiServer *server;
153
169
gnutls_certificate_credentials_t cred;
154
170
unsigned int dh_bits;
156
172
const char *priority;
157
173
gpgme_ctx_t ctx;
158
174
server *current_server;
175
char *interfaces;
176
size_t interfaces_size;
159
177
} mandos_context;
160
178
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
166
181
167
182
sig_atomic_t quit_now = 0;
168
183
int signal_received = 0;
169
184
170
185
/* Function to use when printing errors */
171
186
void perror_plus(const char *print_text){
187
int e = errno;
172
188
fprintf(stderr, "Mandos plugin %s: ",
173
189
program_invocation_short_name);
190
errno = e;
174
191
perror(print_text);
175
192
}
176
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
}
203
177
204
/*
178
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
206
* bytes. "buffer_capacity" is how much is currently allocated,
180
207
* "buffer_length" is how much is already used.
181
208
*/
209
__attribute__((nonnull, warn_unused_result))
182
210
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
211
size_t buffer_capacity){
184
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
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;
187
219
return 0;
188
220
}
221
*buffer = new_buf;
189
222
buffer_capacity += BUFFER_SIZE;
190
223
}
191
224
return buffer_capacity;
192
225
}
193
226
194
227
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
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){
198
231
int ret;
199
232
server *new_server = malloc(sizeof(server));
200
233
if(new_server == NULL){
201
234
perror_plus("malloc");
202
return -1;
235
return false;
203
236
}
204
237
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
238
.port = port,
239
.if_index = if_index,
240
.af = af };
208
241
if(new_server->ip == NULL){
209
242
perror_plus("strdup");
210
return -1;
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;
211
259
}
212
260
/* Special case of first server */
213
if (mc.current_server == NULL){
261
if(*current_server == NULL){
214
262
new_server->next = new_server;
215
263
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
264
*current_server = new_server;
218
265
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
221
269
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
270
(*current_server)->prev = new_server;
271
}
272
return true;
230
273
}
231
274
232
275
/*
233
276
* Initialize GPGME.
234
277
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
282
mandos_context *mc){
237
283
gpgme_error_t rc;
238
284
gpgme_engine_info_t engine_info;
239
285
240
241
286
/*
242
287
* Helper function to insert pub and seckey to the engine keyring.
243
288
*/
244
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
245
290
int ret;
246
291
int fd;
247
292
gpgme_data_t pgp_data;
254
299
255
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
301
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
260
304
return false;
261
305
}
262
306
263
rc = gpgme_op_import(mc.ctx, pgp_data);
307
rc = gpgme_op_import(mc->ctx, pgp_data);
264
308
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
268
311
return false;
269
312
}
270
313
271
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
ret = close(fd);
272
315
if(ret == -1){
273
316
perror_plus("close");
274
317
}
277
320
}
278
321
279
322
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
323
fprintf_plus(stderr, "Initializing GPGME\n");
282
324
}
283
325
284
326
/* Init GPGME */
285
327
gpgme_check_version(NULL);
286
328
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
329
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
291
332
return false;
292
333
}
293
334
294
335
/* Set GPGME home directory for the OpenPGP engine only */
295
336
rc = gpgme_get_engine_info(&engine_info);
296
337
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
300
340
return false;
301
341
}
302
342
while(engine_info != NULL){
308
348
engine_info = engine_info->next;
309
349
}
310
350
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
352
tempdir);
313
353
return false;
314
354
}
315
355
316
356
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
357
rc = gpgme_new(&(mc->ctx));
318
358
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
361
gpgme_strerror(rc));
322
362
return false;
323
363
}
324
364
333
373
* Decrypt OpenPGP data.
334
374
* Returns -1 on error
335
375
*/
376
__attribute__((nonnull, warn_unused_result))
336
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
378
size_t crypto_size,
338
char **plaintext){
379
char **plaintext,
380
mandos_context *mc){
339
381
gpgme_data_t dh_crypto, dh_plain;
340
382
gpgme_error_t rc;
341
383
ssize_t ret;
343
385
ssize_t plaintext_length = 0;
344
386
345
387
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
348
389
}
349
390
350
391
/* Create new GPGME data buffer from memory cryptotext */
351
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
393
0);
353
394
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
357
397
return -1;
358
398
}
359
399
360
400
/* Create new empty GPGME data buffer for the plaintext */
361
401
rc = gpgme_data_new(&dh_plain);
362
402
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
366
406
gpgme_data_release(dh_crypto);
367
407
return -1;
368
408
}
369
409
370
410
/* Decrypt data from the cryptotext data buffer to the plaintext
371
411
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
413
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
377
416
plaintext_length = -1;
378
417
if(debug){
379
418
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
381
420
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
422
} else {
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
391
427
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
429
}
395
430
gpgme_recipient_t recipient;
396
431
recipient = result->recipients;
397
432
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
439
? "No" : "Yes");
407
440
recipient = recipient->next;
408
441
}
409
442
}
412
445
}
413
446
414
447
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
448
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
449
}
418
450
419
451
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
458
*plaintext = NULL;
427
459
while(true){
428
460
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
461
(size_t)plaintext_length,
462
plaintext_capacity);
431
463
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
464
perror_plus("incbuffer");
465
plaintext_length = -1;
466
goto decrypt_end;
435
467
}
436
468
437
469
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
482
}
451
483
452
484
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
485
fprintf_plus(stderr, "Decrypted password is: ");
455
486
for(ssize_t i = 0; i < plaintext_length; i++){
456
487
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
488
}
468
499
return plaintext_length;
469
500
}
470
501
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
504
if(str == NULL)
505
return "(unknown)";
506
return str;
507
}
508
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
477
513
}
478
514
479
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
480
517
static void debuggnutls(__attribute__((unused)) int level,
481
518
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
519
fprintf_plus(stderr, "GnuTLS: %s", string);
483
520
}
484
521
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
485
523
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
526
mandos_context *mc){
487
527
int ret;
528
unsigned int uret;
488
529
489
530
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
492
}
493
494
ret = gnutls_global_init();
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
498
return -1;
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
499
532
}
500
533
501
534
if(debug){
507
540
}
508
541
509
542
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
544
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
514
gnutls_global_deinit();
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
515
547
return -1;
516
548
}
517
549
518
550
if(debug){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
seckeyfilename);
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
553
pubkeyfilename,
554
seckeyfilename);
523
555
}
524
556
525
557
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
527
559
GNUTLS_OPENPGP_FMT_BASE64);
528
560
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
561
fprintf_plus(stderr,
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
535
566
goto globalfail;
536
567
}
537
568
538
569
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
540
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
551
goto globalfail;
552
}
553
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
575
goto globalfail;
576
}
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
do {
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
if(dhpfile == -1){
583
perror_plus("open");
584
dhparamsfilename = NULL;
585
break;
586
}
587
size_t params_capacity = 0;
588
while(true){
589
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params.size,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
594
free(params.data);
595
params.data = NULL;
596
dhparamsfilename = NULL;
597
break;
598
}
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
601
BUFFER_SIZE);
602
/* EOF */
603
if(bytes_read == 0){
604
break;
605
}
606
/* check bytes_read for failure */
607
if(bytes_read < 0){
608
perror_plus("read");
609
free(params.data);
610
params.data = NULL;
611
dhparamsfilename = NULL;
612
break;
613
}
614
params.size += (unsigned int)bytes_read;
615
}
616
close(dhpfile);
617
if(params.data == NULL){
618
dhparamsfilename = NULL;
619
}
620
if(dhparamsfilename == NULL){
621
break;
622
}
623
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
624
GNUTLS_X509_FMT_PEM);
625
if(ret != GNUTLS_E_SUCCESS){
626
fprintf_plus(stderr, "Failed to parse DH parameters in file"
627
" \"%s\": %s\n", dhparamsfilename,
628
safer_gnutls_strerror(ret));
629
dhparamsfilename = NULL;
630
}
631
free(params.data);
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
555
752
556
753
return 0;
557
754
558
755
globalfail:
559
756
560
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
757
gnutls_certificate_free_credentials(mc->cred);
758
gnutls_dh_params_deinit(mc->dh_params);
563
759
return -1;
564
760
}
565
761
566
static int init_gnutls_session(gnutls_session_t *session){
762
__attribute__((nonnull, warn_unused_result))
763
static int init_gnutls_session(gnutls_session_t *session,
764
mandos_context *mc){
567
765
int ret;
568
766
/* GnuTLS session creation */
569
767
do {
573
771
}
574
772
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
773
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
578
safer_gnutls_strerror(ret));
774
fprintf_plus(stderr,
775
"Error in GnuTLS session initialization: %s\n",
776
safer_gnutls_strerror(ret));
579
777
}
580
778
581
779
{
582
780
const char *err;
583
781
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
782
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
585
783
if(quit_now){
586
784
gnutls_deinit(*session);
587
785
return -1;
588
786
}
589
787
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
788
if(ret != GNUTLS_E_SUCCESS){
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
789
fprintf_plus(stderr, "Syntax error at: %s\n", err);
790
fprintf_plus(stderr, "GnuTLS error: %s\n",
791
safer_gnutls_strerror(ret));
595
792
gnutls_deinit(*session);
596
793
return -1;
597
794
}
599
796
600
797
do {
601
798
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
799
mc->cred);
603
800
if(quit_now){
604
801
gnutls_deinit(*session);
605
802
return -1;
606
803
}
607
804
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
805
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
806
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
807
safer_gnutls_strerror(ret));
612
808
gnutls_deinit(*session);
613
809
return -1;
614
810
}
616
812
/* ignore client certificate if any. */
617
813
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
814
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
621
815
return 0;
622
816
}
623
817
625
819
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
626
820
__attribute__((unused)) const char *txt){}
627
821
822
/* Set effective uid to 0, return errno */
823
__attribute__((warn_unused_result))
824
int raise_privileges(void){
825
int old_errno = errno;
826
int ret = 0;
827
if(seteuid(0) == -1){
828
ret = errno;
829
}
830
errno = old_errno;
831
return ret;
832
}
833
834
/* Set effective and real user ID to 0. Return errno. */
835
__attribute__((warn_unused_result))
836
int raise_privileges_permanently(void){
837
int old_errno = errno;
838
int ret = raise_privileges();
839
if(ret != 0){
840
errno = old_errno;
841
return ret;
842
}
843
if(setuid(0) == -1){
844
ret = errno;
845
}
846
errno = old_errno;
847
return ret;
848
}
849
850
/* Set effective user ID to unprivileged saved user ID */
851
__attribute__((warn_unused_result))
852
int lower_privileges(void){
853
int old_errno = errno;
854
int ret = 0;
855
if(seteuid(uid) == -1){
856
ret = errno;
857
}
858
errno = old_errno;
859
return ret;
860
}
861
862
/* Lower privileges permanently */
863
__attribute__((warn_unused_result))
864
int lower_privileges_permanently(void){
865
int old_errno = errno;
866
int ret = 0;
867
if(setuid(uid) == -1){
868
ret = errno;
869
}
870
errno = old_errno;
871
return ret;
872
}
873
874
/* Helper function to add_local_route() and delete_local_route() */
875
__attribute__((nonnull, warn_unused_result))
876
static bool add_delete_local_route(const bool add,
877
const char *address,
878
AvahiIfIndex if_index){
879
int ret;
880
char helper[] = "mandos-client-iprouteadddel";
881
char add_arg[] = "add";
882
char delete_arg[] = "delete";
883
char debug_flag[] = "--debug";
884
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
885
if(pluginhelperdir == NULL){
886
if(debug){
887
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
888
" variable not set; cannot run helper\n");
889
}
890
return false;
891
}
892
893
char interface[IF_NAMESIZE];
894
if(if_indextoname((unsigned int)if_index, interface) == NULL){
895
perror_plus("if_indextoname");
896
return false;
897
}
898
899
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
if(devnull == -1){
901
perror_plus("open(\"/dev/null\", O_RDONLY)");
902
return false;
903
}
904
pid_t pid = fork();
905
if(pid == 0){
906
/* Child */
907
/* Raise privileges */
908
errno = raise_privileges_permanently();
909
if(errno != 0){
910
perror_plus("Failed to raise privileges");
911
/* _exit(EX_NOPERM); */
912
} else {
913
/* Set group */
914
errno = 0;
915
ret = setgid(0);
916
if(ret == -1){
917
perror_plus("setgid");
918
_exit(EX_NOPERM);
919
}
920
/* Reset supplementary groups */
921
errno = 0;
922
ret = setgroups(0, NULL);
923
if(ret == -1){
924
perror_plus("setgroups");
925
_exit(EX_NOPERM);
926
}
927
}
928
ret = dup2(devnull, STDIN_FILENO);
929
if(ret == -1){
930
perror_plus("dup2(devnull, STDIN_FILENO)");
931
_exit(EX_OSERR);
932
}
933
ret = close(devnull);
934
if(ret == -1){
935
perror_plus("close");
936
_exit(EX_OSERR);
937
}
938
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
if(ret == -1){
940
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
_exit(EX_OSERR);
942
}
943
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
O_RDONLY
945
| O_DIRECTORY
946
| O_PATH
947
| O_CLOEXEC));
948
if(helperdir_fd == -1){
949
perror_plus("open");
950
_exit(EX_UNAVAILABLE);
951
}
952
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
helper, O_RDONLY));
954
if(helper_fd == -1){
955
perror_plus("openat");
956
close(helperdir_fd);
957
_exit(EX_UNAVAILABLE);
958
}
959
close(helperdir_fd);
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
628
1040
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
630
1043
AvahiIfIndex if_index,
631
int af){
1044
int af, mandos_context *mc){
632
1045
int ret, tcp_sd = -1;
633
1046
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
1047
struct sockaddr_storage to;
638
1048
char *buffer = NULL;
639
1049
char *decrypted_buffer = NULL;
640
1050
size_t buffer_length = 0;
643
1053
int retval = -1;
644
1054
gnutls_session_t session;
645
1055
int pf; /* Protocol family */
1056
bool route_added = false;
646
1057
647
1058
errno = 0;
648
1059
659
1070
pf = PF_INET;
660
1071
break;
661
1072
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
664
1074
errno = EINVAL;
665
1075
return -1;
666
1076
}
667
1077
668
ret = init_gnutls_session(&session);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface = argz_next(mc->interfaces,
1085
mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
669
1112
if(ret != 0){
670
1113
return -1;
671
1114
}
672
1115
673
1116
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
677
1119
}
678
1120
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
680
1122
if(tcp_sd < 0){
681
1123
int e = errno;
682
1124
perror_plus("socket");
689
1131
goto mandos_end;
690
1132
}
691
1133
692
memset(&to, 0, sizeof(to));
693
1134
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
696
1138
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
699
1142
}
700
1143
if(ret < 0 ){
701
1144
int e = errno;
705
1148
}
706
1149
if(ret == 0){
707
1150
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
710
1152
errno = e;
711
1153
goto mandos_end;
712
1154
}
713
1155
if(af == AF_INET6){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
718
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
721
1159
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
725
1162
errno = EINVAL;
726
1163
goto mandos_end;
727
1164
}
728
1165
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
730
1167
}
731
1168
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
735
1170
}
736
1171
737
1172
if(quit_now){
745
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
1181
perror_plus("if_indextoname");
747
1182
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
751
1185
}
752
1186
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
755
1189
}
756
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
762
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
765
}
766
if(pcret == NULL){
767
perror_plus("inet_ntop");
768
} else {
769
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
772
}
773
}
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
}
786
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
798
1272
}
799
1273
800
1274
const char *out = mandos_protocol_version;
802
1276
while(true){
803
1277
size_t out_size = strlen(out);
804
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
out_size - written));
1279
out_size - written));
806
1280
if(ret == -1){
807
1281
int e = errno;
808
1282
perror_plus("write");
828
1302
}
829
1303
830
1304
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
833
1306
}
834
1307
835
1308
if(quit_now){
837
1310
goto mandos_end;
838
1311
}
839
1312
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
842
1318
843
1319
if(quit_now){
844
1320
errno = EINTR;
855
1331
856
1332
if(ret != GNUTLS_E_SUCCESS){
857
1333
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
860
1335
gnutls_perror(ret);
861
1336
}
862
1337
errno = EPROTO;
866
1341
/* Read OpenPGP packet that contains the wanted password */
867
1342
868
1343
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
871
1346
}
872
1347
873
1348
while(true){
878
1353
}
879
1354
880
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
881
buffer_capacity);
1356
buffer_capacity);
882
1357
if(buffer_capacity == 0){
883
1358
int e = errno;
884
1359
perror_plus("incbuffer");
911
1386
}
912
1387
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
1388
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
916
1391
gnutls_perror(ret);
917
1392
errno = EPROTO;
918
1393
goto mandos_end;
919
1394
}
920
1395
break;
921
1396
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
925
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
1400
errno = EIO;
927
1401
goto mandos_end;
932
1406
}
933
1407
934
1408
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
1409
fprintf_plus(stderr, "Closing TLS session\n");
937
1410
}
938
1411
939
1412
if(quit_now){
951
1424
952
1425
if(buffer_length > 0){
953
1426
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
956
&decrypted_buffer);
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
957
1429
if(decrypted_buffer_size >= 0){
958
1430
1431
clearerr(stdout);
959
1432
written = 0;
960
1433
while(written < (size_t) decrypted_buffer_size){
961
1434
if(quit_now){
969
1442
if(ret == 0 and ferror(stdout)){
970
1443
int e = errno;
971
1444
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
1445
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1446
strerror(errno));
975
1447
}
976
1448
errno = e;
977
1449
goto mandos_end;
978
1450
}
979
1451
written += (size_t)ret;
980
1452
}
1453
ret = fflush(stdout);
1454
if(ret != 0){
1455
int e = errno;
1456
if(debug){
1457
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1458
strerror(errno));
1459
}
1460
errno = e;
1461
goto mandos_end;
1462
}
981
1463
retval = 0;
982
1464
}
983
1465
}
986
1468
987
1469
mandos_end:
988
1470
{
1471
if(route_added){
1472
if(not delete_local_route(ip, if_index)){
1473
fprintf_plus(stderr, "Failed to delete local route to %s on"
1474
" interface %d", ip, if_index);
1475
}
1476
}
989
1477
int e = errno;
990
1478
free(decrypted_buffer);
991
1479
free(buffer);
992
1480
if(tcp_sd >= 0){
993
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1481
ret = close(tcp_sd);
994
1482
}
995
1483
if(ret == -1){
996
1484
if(e == 0){
1021
1509
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
1510
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
1511
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
1025
assert(r);
1512
void *mc){
1513
if(r == NULL){
1514
return;
1515
}
1026
1516
1027
1517
/* Called whenever a service has been resolved successfully or
1028
1518
timed out */
1029
1519
1030
1520
if(quit_now){
1521
avahi_s_service_resolver_free(r);
1031
1522
return;
1032
1523
}
1033
1524
1034
1525
switch(event){
1035
1526
default:
1036
1527
case AVAHI_RESOLVER_FAILURE:
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
1528
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1529
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1530
domain,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
1041
1533
break;
1042
1534
1043
1535
case AVAHI_RESOLVER_FOUND:
1045
1537
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1538
avahi_address_snprint(ip, sizeof(ip), address);
1047
1539
if(debug){
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1540
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1541
PRIdMAX ") on port %" PRIu16 "\n", name,
1542
host_name, ip, (intmax_t)interface, port);
1052
1543
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1544
int ret = start_mandos_communication(ip, (in_port_t)port,
1545
interface,
1546
avahi_proto_to_af(proto),
1547
mc);
1055
1548
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1549
avahi_simple_poll_quit(simple_poll);
1057
1550
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1551
if(not add_server(ip, (in_port_t)port, interface,
1552
avahi_proto_to_af(proto),
1553
&((mandos_context*)mc)->current_server)){
1554
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1555
" list\n", name);
1556
}
1060
1557
}
1061
1558
}
1062
1559
}
1072
1569
const char *domain,
1073
1570
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
1571
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
1076
assert(b);
1572
void *mc){
1573
if(b == NULL){
1574
return;
1575
}
1077
1576
1078
1577
/* Called whenever a new services becomes available on the LAN or
1079
1578
is removed from the LAN */
1086
1585
default:
1087
1586
case AVAHI_BROWSER_FAILURE:
1088
1587
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
avahi_simple_poll_quit(mc.simple_poll);
1588
fprintf_plus(stderr, "(Avahi browser) %s\n",
1589
avahi_strerror(avahi_server_errno
1590
(((mandos_context*)mc)->server)));
1591
avahi_simple_poll_quit(simple_poll);
1093
1592
return;
1094
1593
1095
1594
case AVAHI_BROWSER_NEW:
1098
1597
the callback function is called the Avahi server will free the
1099
1598
resolver for us. */
1100
1599
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
1600
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1601
interface, protocol, name, type,
1602
domain, protocol, 0,
1603
resolve_callback, mc) == NULL)
1604
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1605
" %s\n", name,
1606
avahi_strerror(avahi_server_errno
1607
(((mandos_context*)mc)->server)));
1107
1608
break;
1108
1609
1109
1610
case AVAHI_BROWSER_REMOVE:
1112
1613
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1614
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1615
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1616
fprintf_plus(stderr, "No Mandos server found, still"
1617
" searching...\n");
1117
1618
}
1118
1619
break;
1119
1620
}
1128
1629
signal_received = sig;
1129
1630
int old_errno = errno;
1130
1631
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1632
if(simple_poll != NULL){
1633
avahi_simple_poll_quit(simple_poll);
1133
1634
}
1134
1635
errno = old_errno;
1135
1636
}
1136
1637
1638
__attribute__((nonnull, warn_unused_result))
1137
1639
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1640
int ret;
1641
int old_errno;
1139
1642
1140
1643
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
1644
if(s < 0){
1645
old_errno = errno;
1142
1646
perror_plus("socket");
1647
errno = old_errno;
1143
1648
return false;
1144
1649
}
1145
strcpy(ifr->ifr_name, ifname);
1650
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1651
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1146
1652
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1653
if(ret == -1){
1148
1654
if(debug){
1655
old_errno = errno;
1149
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
errno = old_errno;
1150
1658
}
1659
close(s);
1151
1660
return false;
1152
1661
}
1662
close(s);
1153
1663
return true;
1154
1664
}
1155
1665
1666
__attribute__((nonnull, warn_unused_result))
1156
1667
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1668
1158
1669
/* Reject the loopback device */
1159
1670
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
1671
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1672
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1673
ifname);
1163
1674
}
1164
1675
return false;
1165
1676
}
1166
1677
/* Accept point-to-point devices only if connect_to is specified */
1167
1678
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
1679
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1680
fprintf_plus(stderr, "Accepting point-to-point interface"
1681
" \"%s\"\n", ifname);
1171
1682
}
1172
1683
return true;
1173
1684
}
1174
1685
/* Otherwise, reject non-broadcast-capable devices */
1175
1686
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
1687
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1688
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1689
" \"%s\"\n", ifname);
1179
1690
}
1180
1691
return false;
1181
1692
}
1182
1693
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1694
if(ifr->ifr_flags & IFF_NOARP){
1184
1695
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1696
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1697
ifname);
1187
1698
}
1188
1699
return false;
1189
1700
}
1190
1701
1191
1702
/* Accept this device */
1192
1703
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1704
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1195
1705
}
1196
1706
return true;
1197
1707
}
1201
1711
* corresponds to an acceptable network device.
1202
1712
* (This function is passed to scandir(3) as a filter function.)
1203
1713
*/
1714
__attribute__((nonnull, warn_unused_result))
1204
1715
int good_interface(const struct dirent *if_entry){
1205
1716
if(if_entry->d_name[0] == '.'){
1206
1717
return 0;
1209
1720
struct ifreq ifr;
1210
1721
if(not get_flags(if_entry->d_name, &ifr)){
1211
1722
if(debug){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1723
fprintf_plus(stderr, "Failed to get flags for interface "
1724
"\"%s\"\n", if_entry->d_name);
1725
}
1726
return 0;
1727
}
1728
1729
if(not good_flags(if_entry->d_name, &ifr)){
1730
return 0;
1731
}
1732
return 1;
1733
}
1734
1735
/*
1736
* This function determines if a network interface is up.
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_up(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_UP);
1750
}
1751
1752
/*
1753
* This function determines if a network interface is running
1754
*/
1755
__attribute__((nonnull, warn_unused_result))
1756
bool interface_is_running(const char *interface){
1757
struct ifreq ifr;
1758
if(not get_flags(interface, &ifr)){
1759
if(debug){
1760
fprintf_plus(stderr, "Failed to get flags for interface "
1761
"\"%s\"\n", interface);
1762
}
1763
return false;
1764
}
1765
1766
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1767
}
1768
1769
__attribute__((nonnull, pure, warn_unused_result))
1271
1770
int notdotentries(const struct dirent *direntry){
1272
1771
/* Skip "." and ".." */
1273
1772
if(direntry->d_name[0] == '.'
1280
1779
}
1281
1780
1282
1781
/* Is this directory entry a runnable program? */
1782
__attribute__((nonnull, warn_unused_result))
1283
1783
int runnable_hook(const struct dirent *direntry){
1284
1784
int ret;
1785
size_t sret;
1285
1786
struct stat st;
1286
1787
1287
1788
if((direntry->d_name)[0] == '\0'){
1289
1790
return 0;
1290
1791
}
1291
1792
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1793
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1794
"abcdefghijklmnopqrstuvwxyz"
1795
"0123456789"
1796
"_.-");
1797
if((direntry->d_name)[sret] != '\0'){
1798
/* Contains non-allowed characters */
1799
if(debug){
1800
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1801
direntry->d_name);
1802
}
1803
return 0;
1804
}
1805
1806
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1317
1807
if(ret == -1){
1318
1808
if(debug){
1319
perror_plus("Could not stat plugin");
1809
perror_plus("Could not stat hook");
1320
1810
}
1321
1811
return 0;
1322
1812
}
1323
1813
if(not (S_ISREG(st.st_mode))){
1324
1814
/* Not a regular file */
1815
if(debug){
1816
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1817
direntry->d_name);
1818
}
1325
1819
return 0;
1326
1820
}
1327
1821
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1822
/* Not executable */
1823
if(debug){
1824
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1825
direntry->d_name);
1826
}
1329
1827
return 0;
1330
1828
}
1829
if(debug){
1830
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1831
direntry->d_name);
1832
}
1331
1833
return 1;
1332
1834
}
1333
1835
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1836
__attribute__((nonnull, warn_unused_result))
1837
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1838
mandos_context *mc){
1335
1839
int ret;
1336
1840
struct timespec now;
1337
1841
struct timespec waited_time;
1338
1842
intmax_t block_time;
1339
1843
1340
1844
while(true){
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1845
if(mc->current_server == NULL){
1846
if(debug){
1847
fprintf_plus(stderr, "Wait until first server is found."
1848
" No timeout!\n");
1345
1849
}
1346
1850
ret = avahi_simple_poll_iterate(s, -1);
1347
1851
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1852
if(debug){
1853
fprintf_plus(stderr, "Check current_server if we should run"
1854
" it, or wait\n");
1352
1855
}
1353
1856
/* the current time */
1354
1857
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1359
1862
/* Calculating in ms how long time between now and server
1360
1863
who we visted longest time ago. Now - last seen. */
1361
1864
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1865
- mc->current_server->last_seen.tv_sec);
1363
1866
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1867
- mc->current_server->last_seen.tv_nsec);
1365
1868
/* total time is 10s/10,000ms.
1366
1869
Converting to s from ms by dividing by 1,000,
1367
1870
and ns to ms by dividing by 1,000,000. */
1369
1872
- ((intmax_t)waited_time.tv_sec * 1000))
1370
1873
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1874
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1875
if(debug){
1876
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
block_time);
1375
1878
}
1376
1879
1377
1880
if(block_time <= 0){
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1881
ret = start_mandos_communication(mc->current_server->ip,
1882
mc->current_server->port,
1883
mc->current_server->if_index,
1884
mc->current_server->af, mc);
1382
1885
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1886
avahi_simple_poll_quit(s);
1384
1887
return 0;
1385
1888
}
1386
1889
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1890
&mc->current_server->last_seen);
1388
1891
if(ret == -1){
1389
1892
perror_plus("clock_gettime");
1390
1893
return -1;
1391
1894
}
1392
mc.current_server = mc.current_server->next;
1895
mc->current_server = mc->current_server->next;
1393
1896
block_time = 0; /* Call avahi to find new Mandos
1394
1897
servers, but don't block */
1395
1898
}
1397
1900
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
1901
}
1399
1902
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1903
if(ret > 0 or errno != EINTR){
1401
1904
return (ret != 1) ? ret : 0;
1402
1905
}
1403
1906
}
1404
1907
}
1405
1908
}
1406
1909
1910
__attribute__((nonnull))
1911
void run_network_hooks(const char *mode, const char *interface,
1912
const float delay){
1913
struct dirent **direntries = NULL;
1914
if(hookdir_fd == -1){
1915
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1916
| O_CLOEXEC);
1917
if(hookdir_fd == -1){
1918
if(errno == ENOENT){
1919
if(debug){
1920
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1921
" found\n", hookdir);
1922
}
1923
} else {
1924
perror_plus("open");
1925
}
1926
return;
1927
}
1928
}
1929
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1930
if(devnull == -1){
1931
perror_plus("open(\"/dev/null\", O_RDONLY)");
1932
return;
1933
}
1934
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1935
runnable_hook, alphasort);
1936
if(numhooks == -1){
1937
perror_plus("scandir");
1938
close(devnull);
1939
return;
1940
}
1941
struct dirent *direntry;
1942
int ret;
1943
for(int i = 0; i < numhooks; i++){
1944
direntry = direntries[i];
1945
if(debug){
1946
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1947
direntry->d_name);
1948
}
1949
pid_t hook_pid = fork();
1950
if(hook_pid == 0){
1951
/* Child */
1952
/* Raise privileges */
1953
errno = raise_privileges_permanently();
1954
if(errno != 0){
1955
perror_plus("Failed to raise privileges");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Set group */
1959
errno = 0;
1960
ret = setgid(0);
1961
if(ret == -1){
1962
perror_plus("setgid");
1963
_exit(EX_NOPERM);
1964
}
1965
/* Reset supplementary groups */
1966
errno = 0;
1967
ret = setgroups(0, NULL);
1968
if(ret == -1){
1969
perror_plus("setgroups");
1970
_exit(EX_NOPERM);
1971
}
1972
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("DEVICE", interface, 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
ret = setenv("MODE", mode, 1);
1988
if(ret == -1){
1989
perror_plus("setenv");
1990
_exit(EX_OSERR);
1991
}
1992
char *delaystring;
1993
ret = asprintf(&delaystring, "%f", (double)delay);
1994
if(ret == -1){
1995
perror_plus("asprintf");
1996
_exit(EX_OSERR);
1997
}
1998
ret = setenv("DELAY", delaystring, 1);
1999
if(ret == -1){
2000
free(delaystring);
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
free(delaystring);
2005
if(connect_to != NULL){
2006
ret = setenv("CONNECT", connect_to, 1);
2007
if(ret == -1){
2008
perror_plus("setenv");
2009
_exit(EX_OSERR);
2010
}
2011
}
2012
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
direntry->d_name,
2014
O_RDONLY));
2015
if(hook_fd == -1){
2016
perror_plus("openat");
2017
_exit(EXIT_FAILURE);
2018
}
2019
if(close(hookdir_fd) == -1){
2020
perror_plus("close");
2021
_exit(EXIT_FAILURE);
2022
}
2023
ret = dup2(devnull, STDIN_FILENO);
2024
if(ret == -1){
2025
perror_plus("dup2(devnull, STDIN_FILENO)");
2026
_exit(EX_OSERR);
2027
}
2028
ret = close(devnull);
2029
if(ret == -1){
2030
perror_plus("close");
2031
_exit(EX_OSERR);
2032
}
2033
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2034
if(ret == -1){
2035
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2036
_exit(EX_OSERR);
2037
}
2038
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2039
environ) == -1){
2040
perror_plus("fexecve");
2041
_exit(EXIT_FAILURE);
2042
}
2043
} else {
2044
if(hook_pid == -1){
2045
perror_plus("fork");
2046
free(direntry);
2047
continue;
2048
}
2049
int status;
2050
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2051
perror_plus("waitpid");
2052
free(direntry);
2053
continue;
2054
}
2055
if(WIFEXITED(status)){
2056
if(WEXITSTATUS(status) != 0){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2058
" with status %d\n", direntry->d_name,
2059
WEXITSTATUS(status));
2060
free(direntry);
2061
continue;
2062
}
2063
} else if(WIFSIGNALED(status)){
2064
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2065
" signal %d\n", direntry->d_name,
2066
WTERMSIG(status));
2067
free(direntry);
2068
continue;
2069
} else {
2070
fprintf_plus(stderr, "Warning: network hook \"%s\""
2071
" crashed\n", direntry->d_name);
2072
free(direntry);
2073
continue;
2074
}
2075
}
2076
if(debug){
2077
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
direntry->d_name);
2079
}
2080
free(direntry);
2081
}
2082
free(direntries);
2083
if(close(hookdir_fd) == -1){
2084
perror_plus("close");
2085
} else {
2086
hookdir_fd = -1;
2087
}
2088
close(devnull);
2089
}
2090
2091
__attribute__((nonnull, warn_unused_result))
2092
int bring_up_interface(const char *const interface,
2093
const float delay){
2094
int old_errno = errno;
2095
int ret;
2096
struct ifreq network;
2097
unsigned int if_index = if_nametoindex(interface);
2098
if(if_index == 0){
2099
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2100
errno = old_errno;
2101
return ENXIO;
2102
}
2103
2104
if(quit_now){
2105
errno = old_errno;
2106
return EINTR;
2107
}
2108
2109
if(not interface_is_up(interface)){
2110
int ret_errno = 0;
2111
int ioctl_errno = 0;
2112
if(not get_flags(interface, &network)){
2113
ret_errno = errno;
2114
fprintf_plus(stderr, "Failed to get flags for interface "
2115
"\"%s\"\n", interface);
2116
errno = old_errno;
2117
return ret_errno;
2118
}
2119
network.ifr_flags |= IFF_UP; /* set flag */
2120
2121
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2122
if(sd == -1){
2123
ret_errno = errno;
2124
perror_plus("socket");
2125
errno = old_errno;
2126
return ret_errno;
2127
}
2128
2129
if(quit_now){
2130
ret = close(sd);
2131
if(ret == -1){
2132
perror_plus("close");
2133
}
2134
errno = old_errno;
2135
return EINTR;
2136
}
2137
2138
if(debug){
2139
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2140
interface);
2141
}
2142
2143
/* Raise privileges */
2144
ret_errno = raise_privileges();
2145
if(ret_errno != 0){
2146
errno = ret_errno;
2147
perror_plus("Failed to raise privileges");
2148
}
2149
2150
#ifdef __linux__
2151
int ret_linux;
2152
bool restore_loglevel = false;
2153
if(ret_errno == 0){
2154
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2155
messages about the network interface to mess up the prompt */
2156
ret_linux = klogctl(8, NULL, 5);
2157
if(ret_linux == -1){
2158
perror_plus("klogctl");
2159
} else {
2160
restore_loglevel = true;
2161
}
2162
}
2163
#endif /* __linux__ */
2164
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2165
ioctl_errno = errno;
2166
#ifdef __linux__
2167
if(restore_loglevel){
2168
ret_linux = klogctl(7, NULL, 0);
2169
if(ret_linux == -1){
2170
perror_plus("klogctl");
2171
}
2172
}
2173
#endif /* __linux__ */
2174
2175
/* If raise_privileges() succeeded above */
2176
if(ret_errno == 0){
2177
/* Lower privileges */
2178
ret_errno = lower_privileges();
2179
if(ret_errno != 0){
2180
errno = ret_errno;
2181
perror_plus("Failed to lower privileges");
2182
}
2183
}
2184
2185
/* Close the socket */
2186
ret = close(sd);
2187
if(ret == -1){
2188
perror_plus("close");
2189
}
2190
2191
if(ret_setflags == -1){
2192
errno = ioctl_errno;
2193
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
errno = old_errno;
2195
return ioctl_errno;
2196
}
2197
} else if(debug){
2198
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2199
interface);
2200
}
2201
2202
/* Sleep checking until interface is running.
2203
Check every 0.25s, up to total time of delay */
2204
for(int i = 0; i < delay * 4; i++){
2205
if(interface_is_running(interface)){
2206
break;
2207
}
2208
struct timespec sleeptime = { .tv_nsec = 250000000 };
2209
ret = nanosleep(&sleeptime, NULL);
2210
if(ret == -1 and errno != EINTR){
2211
perror_plus("nanosleep");
2212
}
2213
}
2214
2215
errno = old_errno;
2216
return 0;
2217
}
2218
2219
__attribute__((nonnull, warn_unused_result))
2220
int take_down_interface(const char *const interface){
2221
int old_errno = errno;
2222
struct ifreq network;
2223
unsigned int if_index = if_nametoindex(interface);
2224
if(if_index == 0){
2225
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2226
errno = old_errno;
2227
return ENXIO;
2228
}
2229
if(interface_is_up(interface)){
2230
int ret_errno = 0;
2231
int ioctl_errno = 0;
2232
if(not get_flags(interface, &network) and debug){
2233
ret_errno = errno;
2234
fprintf_plus(stderr, "Failed to get flags for interface "
2235
"\"%s\"\n", interface);
2236
errno = old_errno;
2237
return ret_errno;
2238
}
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
2241
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2242
if(sd == -1){
2243
ret_errno = errno;
2244
perror_plus("socket");
2245
errno = old_errno;
2246
return ret_errno;
2247
}
2248
2249
if(debug){
2250
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2251
interface);
2252
}
2253
2254
/* Raise privileges */
2255
ret_errno = raise_privileges();
2256
if(ret_errno != 0){
2257
errno = ret_errno;
2258
perror_plus("Failed to raise privileges");
2259
}
2260
2261
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2262
ioctl_errno = errno;
2263
2264
/* If raise_privileges() succeeded above */
2265
if(ret_errno == 0){
2266
/* Lower privileges */
2267
ret_errno = lower_privileges();
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("Failed to lower privileges");
2271
}
2272
}
2273
2274
/* Close the socket */
2275
int ret = close(sd);
2276
if(ret == -1){
2277
perror_plus("close");
2278
}
2279
2280
if(ret_setflags == -1){
2281
errno = ioctl_errno;
2282
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
errno = old_errno;
2284
return ioctl_errno;
2285
}
2286
} else if(debug){
2287
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
interface);
2289
}
2290
2291
errno = old_errno;
2292
return 0;
2293
}
2294
1407
2295
int main(int argc, char *argv[]){
2296
mandos_context mc = { .server = NULL, .dh_bits = 0,
2297
.priority = "SECURE256:!CTYPE-X.509"
2298
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2299
.current_server = NULL, .interfaces = NULL,
2300
.interfaces_size = 0 };
1408
2301
AvahiSServiceBrowser *sb = NULL;
1409
int error;
2302
error_t ret_errno;
1410
2303
int ret;
1411
2304
intmax_t tmpmax;
1412
2305
char *tmp;
1413
2306
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
2307
char *interfaces_to_take_down = NULL;
2308
size_t interfaces_to_take_down_size = 0;
2309
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2310
char old_tempdir[] = "/tmp/mandosXXXXXX";
2311
char *tempdir = NULL;
1422
2312
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
2313
const char *seckey = PATHDIR "/" SECKEY;
1424
2314
const char *pubkey = PATHDIR "/" PUBKEY;
2315
const char *dh_params_file = NULL;
2316
char *interfaces_hooks = NULL;
1425
2317
1426
2318
bool gnutls_initialized = false;
1427
2319
bool gpgme_initialized = false;
1479
2371
.doc = "Bit length of the prime number used in the"
1480
2372
" Diffie-Hellman key exchange",
1481
2373
.group = 2 },
2374
{ .name = "dh-params", .key = 134,
2375
.arg = "FILE",
2376
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2377
" for the Diffie-Hellman key exchange",
2378
.group = 2 },
1482
2379
{ .name = "priority", .key = 130,
1483
2380
.arg = "STRING",
1484
2381
.doc = "GnuTLS priority string for the TLS handshake",
1489
2386
.group = 2 },
1490
2387
{ .name = "retry", .key = 132,
1491
2388
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
2389
.doc = "Retry interval used when denied by the Mandos server",
1493
2390
.group = 2 },
1494
2391
{ .name = "network-hook-dir", .key = 133,
1495
2392
.arg = "DIR",
1518
2415
connect_to = arg;
1519
2416
break;
1520
2417
case 'i': /* --interface */
1521
interface = arg;
2418
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2419
arg, (int)',');
2420
if(ret_errno != 0){
2421
argp_error(state, "%s", strerror(ret_errno));
2422
}
1522
2423
break;
1523
2424
case 's': /* --seckey */
1524
2425
seckey = arg;
1535
2436
}
1536
2437
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
2438
break;
2439
case 134: /* --dh-params */
2440
dh_params_file = arg;
2441
break;
1538
2442
case 130: /* --priority */
1539
2443
mc.priority = arg;
1540
2444
break;
1567
2471
argp_state_help(state, state->out_stream,
1568
2472
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
2473
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
2474
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
2475
exit(argp_err_exit_status);
1573
2476
break;
1574
2477
default:
1581
2484
.args_doc = "",
1582
2485
.doc = "Mandos client -- Get and decrypt"
1583
2486
" passwords from a Mandos server" };
1584
ret = argp_parse(&argp, argc, argv,
1585
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1586
switch(ret){
2487
ret_errno = argp_parse(&argp, argc, argv,
2488
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
switch(ret_errno){
1587
2490
case 0:
1588
2491
break;
1589
2492
case ENOMEM:
1590
2493
default:
1591
errno = ret;
2494
errno = ret_errno;
1592
2495
perror_plus("argp_parse");
1593
2496
exitcode = EX_OSERR;
1594
2497
goto end;
1597
2500
goto end;
1598
2501
}
1599
2502
}
1600
2503
1601
2504
{
1602
2505
/* Work around Debian bug #633582:
1603
<http://bugs.debian.org/633582> */
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
2506
<https://bugs.debian.org/633582> */
2507
2508
/* Re-raise privileges */
2509
ret = raise_privileges();
2510
if(ret != 0){
2511
errno = ret;
2512
perror_plus("Failed to raise privileges");
1669
2513
} else {
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
2514
struct stat st;
2515
2516
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2517
int seckey_fd = open(seckey, O_RDONLY);
2518
if(seckey_fd == -1){
2519
perror_plus("open");
2520
} else {
2521
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2522
if(ret == -1){
2523
perror_plus("fstat");
2524
} else {
2525
if(S_ISREG(st.st_mode)
2526
and st.st_uid == 0 and st.st_gid == 0){
2527
ret = fchown(seckey_fd, uid, gid);
2528
if(ret == -1){
2529
perror_plus("fchown");
2530
}
2531
}
2532
}
2533
close(seckey_fd);
2534
}
2535
}
2536
2537
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2538
int pubkey_fd = open(pubkey, O_RDONLY);
2539
if(pubkey_fd == -1){
2540
perror_plus("open");
2541
} else {
2542
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2543
if(ret == -1){
2544
perror_plus("fstat");
2545
} else {
2546
if(S_ISREG(st.st_mode)
2547
and st.st_uid == 0 and st.st_gid == 0){
2548
ret = fchown(pubkey_fd, uid, gid);
2549
if(ret == -1){
2550
perror_plus("fchown");
2551
}
2552
}
2553
}
2554
close(pubkey_fd);
2555
}
2556
}
2557
2558
if(dh_params_file != NULL
2559
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2560
int dhparams_fd = open(dh_params_file, O_RDONLY);
2561
if(dhparams_fd == -1){
2562
perror_plus("open");
2563
} else {
2564
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2565
if(ret == -1){
2566
perror_plus("fstat");
2567
} else {
2568
if(S_ISREG(st.st_mode)
2569
and st.st_uid == 0 and st.st_gid == 0){
2570
ret = fchown(dhparams_fd, uid, gid);
2571
if(ret == -1){
2572
perror_plus("fchown");
2573
}
2574
}
2575
}
2576
close(dhparams_fd);
2577
}
2578
}
2579
2580
/* Lower privileges */
2581
ret = lower_privileges();
2582
if(ret != 0){
2583
errno = ret;
2584
perror_plus("Failed to lower privileges");
2585
}
2586
}
2587
}
2588
2589
/* Remove invalid interface names (except "none") */
2590
{
2591
char *interface = NULL;
2592
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2593
interface))){
2594
if(strcmp(interface, "none") != 0
2595
and if_nametoindex(interface) == 0){
2596
if(interface[0] != '\0'){
2597
fprintf_plus(stderr, "Not using nonexisting interface"
2598
" \"%s\"\n", interface);
2599
}
2600
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2601
interface = NULL;
2602
}
2603
}
2604
}
2605
2606
/* Run network hooks */
2607
{
2608
if(mc.interfaces != NULL){
2609
interfaces_hooks = malloc(mc.interfaces_size);
2610
if(interfaces_hooks == NULL){
2611
perror_plus("malloc");
2612
goto end;
2613
}
2614
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2615
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2616
}
2617
run_network_hooks("start", interfaces_hooks != NULL ?
2618
interfaces_hooks : "", delay);
1753
2619
}
1754
2620
1755
2621
if(not debug){
1756
2622
avahi_set_log_function(empty_log);
1757
2623
}
1758
2624
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
1793
2625
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2626
from the signal handler */
1795
2627
/* Initialize the pseudo-RNG for Avahi */
1796
2628
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
2629
simple_poll = avahi_simple_poll_new();
2630
if(simple_poll == NULL){
2631
fprintf_plus(stderr,
2632
"Avahi: Failed to create simple poll object.\n");
1801
2633
exitcode = EX_UNAVAILABLE;
1802
2634
goto end;
1803
2635
}
1865
2697
}
1866
2698
}
1867
2699
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
2700
/* If no interfaces were specified, make a list */
2701
if(mc.interfaces == NULL){
2702
struct dirent **direntries = NULL;
2703
/* Look for any good interfaces */
2704
ret = scandir(sys_class_net, &direntries, good_interface,
2705
alphasort);
2706
if(ret >= 1){
2707
/* Add all found interfaces to interfaces list */
2708
for(int i = 0; i < ret; ++i){
2709
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2710
direntries[i]->d_name);
2711
if(ret_errno != 0){
2712
errno = ret_errno;
2713
perror_plus("argz_add");
2714
free(direntries[i]);
2715
continue;
2716
}
2717
if(debug){
2718
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2719
direntries[i]->d_name);
2720
}
2721
free(direntries[i]);
2722
}
2723
free(direntries);
2724
} else {
2725
if(ret == 0){
2726
free(direntries);
2727
}
2728
fprintf_plus(stderr, "Could not find a network interface\n");
2729
exitcode = EXIT_FAILURE;
2730
goto end;
2731
}
2732
}
2733
2734
/* Bring up interfaces which are down, and remove any "none"s */
2735
{
2736
char *interface = NULL;
2737
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2738
interface))){
2739
/* If interface name is "none", stop bringing up interfaces.
2740
Also remove all instances of "none" from the list */
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
while((interface = argz_next(mc.interfaces,
2746
mc.interfaces_size, interface))){
2747
if(strcmp(interface, "none") == 0){
2748
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
interface);
2750
interface = NULL;
1954
2751
}
1955
2752
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
2753
break;
1974
2754
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2755
bool interface_was_up = interface_is_up(interface);
2756
errno = bring_up_interface(interface, delay);
2757
if(not interface_was_up){
2758
if(errno != 0){
2759
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2760
" %s\n", interface, strerror(errno));
2761
} else {
2762
errno = argz_add(&interfaces_to_take_down,
2763
&interfaces_to_take_down_size,
2764
interface);
2765
if(errno != 0){
2766
perror_plus("argz_add");
2767
}
2768
}
2769
}
2770
}
2771
if(debug and (interfaces_to_take_down == NULL)){
2772
fprintf_plus(stderr, "No interfaces were brought up\n");
2773
}
2774
}
2775
2776
/* If we only got one interface, explicitly use only that one */
2777
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2778
if(debug){
2779
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2780
mc.interfaces);
2781
}
2782
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2783
}
2013
2784
2014
2785
if(quit_now){
2015
2786
goto end;
2016
2787
}
2017
2788
2018
ret = init_gnutls_global(pubkey, seckey);
2789
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2019
2790
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2791
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2792
exitcode = EX_UNAVAILABLE;
2023
2793
goto end;
2024
2794
} else {
2029
2799
goto end;
2030
2800
}
2031
2801
2032
if(mkdtemp(tempdir) == NULL){
2802
/* Try /run/tmp before /tmp */
2803
tempdir = mkdtemp(run_tempdir);
2804
if(tempdir == NULL and errno == ENOENT){
2805
if(debug){
2806
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2807
run_tempdir, old_tempdir);
2808
}
2809
tempdir = mkdtemp(old_tempdir);
2810
}
2811
if(tempdir == NULL){
2033
2812
perror_plus("mkdtemp");
2034
2813
goto end;
2035
2814
}
2036
tempdir_created = true;
2037
2815
2038
2816
if(quit_now){
2039
2817
goto end;
2040
2818
}
2041
2819
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2820
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2821
fprintf_plus(stderr, "init_gpgme failed\n");
2045
2822
exitcode = EX_UNAVAILABLE;
2046
2823
goto end;
2047
2824
} else {
2056
2833
/* Connect directly, do not use Zeroconf */
2057
2834
/* (Mainly meant for debugging) */
2058
2835
char *address = strrchr(connect_to, ':');
2836
2059
2837
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2838
fprintf_plus(stderr, "No colon in address\n");
2062
2839
exitcode = EX_USAGE;
2063
2840
goto end;
2064
2841
}
2067
2844
goto end;
2068
2845
}
2069
2846
2070
uint16_t port;
2847
in_port_t port;
2071
2848
errno = 0;
2072
2849
tmpmax = strtoimax(address+1, &tmp, 10);
2073
2850
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2851
or tmpmax != (in_port_t)tmpmax){
2852
fprintf_plus(stderr, "Bad port number\n");
2077
2853
exitcode = EX_USAGE;
2078
2854
goto end;
2079
2855
}
2080
2856
2081
2857
if(quit_now){
2082
2858
goto end;
2083
2859
}
2084
2860
2085
port = (uint16_t)tmpmax;
2861
port = (in_port_t)tmpmax;
2086
2862
*address = '\0';
2087
2863
/* Colon in address indicates IPv6 */
2088
2864
int af;
2104
2880
}
2105
2881
2106
2882
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2883
ret = start_mandos_communication(address, port, if_index, af,
2884
&mc);
2108
2885
if(quit_now or ret == 0){
2109
2886
break;
2110
2887
}
2111
2888
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2889
fprintf_plus(stderr, "Retrying in %d seconds\n",
2890
(int)retry_interval);
2114
2891
}
2115
sleep((int)retry_interval);
2892
sleep((unsigned int)retry_interval);
2116
2893
}
2117
2894
2118
if (not quit_now){
2895
if(not quit_now){
2119
2896
exitcode = EXIT_SUCCESS;
2120
2897
}
2121
2898
2136
2913
config.publish_domain = 0;
2137
2914
2138
2915
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2916
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2917
&config, NULL, NULL, &ret);
2142
2918
2143
2919
/* Free the Avahi configuration data */
2144
2920
avahi_server_config_free(&config);
2146
2922
2147
2923
/* Check if creating the Avahi server object succeeded */
2148
2924
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2925
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2926
avahi_strerror(ret));
2152
2927
exitcode = EX_UNAVAILABLE;
2153
2928
goto end;
2154
2929
}
2160
2935
/* Create the Avahi service browser */
2161
2936
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
2937
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2938
NULL, 0, browse_callback,
2939
(void *)&mc);
2164
2940
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2941
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2942
avahi_strerror(avahi_server_errno(mc.server)));
2168
2943
exitcode = EX_UNAVAILABLE;
2169
2944
goto end;
2170
2945
}
2176
2951
/* Run the main loop */
2177
2952
2178
2953
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2954
fprintf_plus(stderr, "Starting Avahi loop search\n");
2181
2955
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2956
2957
ret = avahi_loop_with_timeout(simple_poll,
2958
(int)(retry_interval * 1000), &mc);
2185
2959
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2960
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2961
(ret == 0) ? "successfully" : "with error");
2189
2962
}
2190
2963
2191
2964
end:
2192
2965
2193
2966
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2967
if(signal_received){
2968
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2969
argv[0], signal_received,
2970
strsignal(signal_received));
2971
} else {
2972
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2973
}
2196
2974
}
2197
2975
2198
2976
/* Cleanup things */
2977
free(mc.interfaces);
2978
2199
2979
if(sb != NULL)
2200
2980
avahi_s_service_browser_free(sb);
2201
2981
2202
2982
if(mc.server != NULL)
2203
2983
avahi_server_free(mc.server);
2204
2984
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2985
if(simple_poll != NULL)
2986
avahi_simple_poll_free(simple_poll);
2207
2987
2208
2988
if(gnutls_initialized){
2209
2989
gnutls_certificate_free_credentials(mc.cred);
2210
gnutls_global_deinit();
2211
2990
gnutls_dh_params_deinit(mc.dh_params);
2212
2991
}
2213
2992
2214
2993
if(gpgme_initialized){
2215
2994
gpgme_release(mc.ctx);
2216
2995
}
2217
2996
2218
2997
/* Cleans up the circular linked list of Mandos servers the client
2219
2998
has seen */
2220
2999
if(mc.current_server != NULL){
2221
3000
mc.current_server->prev->next = NULL;
2222
3001
while(mc.current_server != NULL){
2223
3002
server *next = mc.current_server->next;
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic push
3005
#pragma GCC diagnostic ignored "-Wcast-qual"
3006
#endif
3007
free((char *)(mc.current_server->ip));
3008
#ifdef __GNUC__
3009
#pragma GCC diagnostic pop
3010
#endif
2224
3011
free(mc.current_server);
2225
3012
mc.current_server = next;
2226
3013
}
2227
3014
}
2228
3015
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2260
}
3016
/* Re-raise privileges */
3017
{
3018
ret = raise_privileges();
3019
if(ret != 0){
3020
errno = ret;
3021
perror_plus("Failed to raise privileges");
3022
} else {
3023
3024
/* Run network hooks */
3025
run_network_hooks("stop", interfaces_hooks != NULL ?
3026
interfaces_hooks : "", delay);
3027
3028
/* Take down the network interfaces which were brought up */
3029
{
3030
char *interface = NULL;
3031
while((interface = argz_next(interfaces_to_take_down,
3032
interfaces_to_take_down_size,
3033
interface))){
3034
ret = take_down_interface(interface);
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to take down interface");
3038
}
3039
}
3040
if(debug and (interfaces_to_take_down == NULL)){
3041
fprintf_plus(stderr, "No interfaces needed to be taken"
3042
" down\n");
3043
}
3044
}
3045
}
3046
3047
ret = lower_privileges_permanently();
3048
if(ret != 0){
3049
errno = ret;
3050
perror_plus("Failed to lower privileges permanently");
3051
}
3052
}
3053
3054
free(interfaces_to_take_down);
3055
free(interfaces_hooks);
3056
3057
void clean_dir_at(int base, const char * const dirname,
3058
uintmax_t level){
3059
struct dirent **direntries = NULL;
3060
int dret;
3061
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
O_RDONLY
3063
| O_NOFOLLOW
3064
| O_DIRECTORY
3065
| O_PATH));
3066
if(dir_fd == -1){
3067
perror_plus("open");
3068
return;
3069
}
3070
int numentries = scandirat(dir_fd, ".", &direntries,
3071
notdotentries, alphasort);
3072
if(numentries >= 0){
3073
for(int i = 0; i < numentries; i++){
3074
if(debug){
3075
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3076
dirname, direntries[i]->d_name);
3077
}
3078
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3079
if(dret == -1){
3080
if(errno == EISDIR){
3081
dret = unlinkat(dir_fd, direntries[i]->d_name,
3082
AT_REMOVEDIR);
3083
}
3084
if((dret == -1) and (errno == ENOTEMPTY)
3085
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3086
== 0) and (level == 0)){
3087
/* Recurse only in this special case */
3088
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3089
dret = 0;
3090
}
3091
if((dret == -1) and (errno != ENOENT)){
3092
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3093
direntries[i]->d_name, strerror(errno));
3094
}
3095
}
3096
free(direntries[i]);
3097
}
3098
3099
/* need to clean even if 0 because man page doesn't specify */
3100
free(direntries);
3101
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3102
if(dret == -1 and errno != ENOENT){
3103
perror_plus("rmdir");
3104
}
3105
} else {
3106
perror_plus("scandirat");
3107
}
3108
close(dir_fd);
2261
3109
}
2262
3110
2263
3111
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2265
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
2272
char *fullname = NULL;
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
direntry->d_name);
2275
if(ret < 0){
2276
perror_plus("asprintf");
2277
continue;
2278
}
2279
ret = remove(fullname);
2280
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2283
}
2284
free(fullname);
2285
}
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
2292
}
2293
ret = rmdir(tempdir);
2294
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2296
}
3112
if(tempdir != NULL){
3113
clean_dir_at(-1, tempdir, 0);
2297
3114
}
2298
3115
2299
3116
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0