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237.2.184
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2010-09-11 18:34:55 UTC
- mfrom: (24.1.162 mandos)
- mto: (24.1.164 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100911183455-kmzttvbywdbfbepm
Merge from Björn.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
86
84
raise() */
87
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
87
99
88
#ifdef __linux__
100
89
#include <sys/klog.h> /* klogctl() */
118
107
init_gnutls_session(),
119
108
GNUTLS_* */
120
109
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
123
112
124
113
/* GPGME */
125
114
#include <gpgme.h> /* All GPGME types, constants and
133
122
#define PATHDIR "/conf/conf.d/mandos"
134
123
#define SECKEY "seckey.txt"
135
124
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
125
138
126
bool debug = false;
139
127
static const char mandos_protocol_version[] = "1";
140
128
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
142
130
static const char sys_class_net[] = "/sys/class/net";
143
131
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
159
132
160
133
/* Used for passing in values through the Avahi callback functions */
161
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
162
136
AvahiServer *server;
163
137
gnutls_certificate_credentials_t cred;
164
138
unsigned int dh_bits;
165
139
gnutls_dh_params_t dh_params;
166
140
const char *priority;
167
141
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
142
} mandos_context;
172
143
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
175
148
176
149
sig_atomic_t quit_now = 0;
177
150
int signal_received = 0;
178
151
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
152
/*
199
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
154
* bytes. "buffer_capacity" is how much is currently allocated,
201
155
* "buffer_length" is how much is already used.
202
156
*/
203
__attribute__((nonnull, warn_unused_result))
204
157
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
158
size_t buffer_capacity){
206
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
213
162
return 0;
214
163
}
215
*buffer = new_buf;
216
164
buffer_capacity += BUFFER_SIZE;
217
165
}
218
166
return buffer_capacity;
219
167
}
220
168
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
169
/*
270
170
* Initialize GPGME.
271
171
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
277
174
gpgme_error_t rc;
278
175
gpgme_engine_info_t engine_info;
279
176
177
280
178
/*
281
179
* Helper function to insert pub and seckey to the engine keyring.
282
180
*/
283
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
284
182
int ret;
285
183
int fd;
286
184
gpgme_data_t pgp_data;
287
185
288
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
187
if(fd == -1){
290
perror_plus("open");
188
perror("open");
291
189
return false;
292
190
}
293
191
294
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
193
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
298
196
return false;
299
197
}
300
198
301
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
302
200
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
305
203
return false;
306
204
}
307
205
308
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
207
if(ret == -1){
310
perror_plus("close");
208
perror("close");
311
209
}
312
210
gpgme_data_release(pgp_data);
313
211
return true;
314
212
}
315
213
316
214
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
318
216
}
319
217
320
218
/* Init GPGME */
321
219
gpgme_check_version(NULL);
322
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
221
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
326
224
return false;
327
225
}
328
226
329
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
330
228
rc = gpgme_get_engine_info(&engine_info);
331
229
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
334
232
return false;
335
233
}
336
234
while(engine_info != NULL){
342
240
engine_info = engine_info->next;
343
241
}
344
242
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
244
return false;
348
245
}
349
246
350
247
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
352
249
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
356
252
return false;
357
253
}
358
254
367
263
* Decrypt OpenPGP data.
368
264
* Returns -1 on error
369
265
*/
370
__attribute__((nonnull, warn_unused_result))
371
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
267
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
268
char **plaintext){
375
269
gpgme_data_t dh_crypto, dh_plain;
376
270
gpgme_error_t rc;
377
271
ssize_t ret;
379
273
ssize_t plaintext_length = 0;
380
274
381
275
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
277
}
384
278
385
279
/* Create new GPGME data buffer from memory cryptotext */
386
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
281
0);
388
282
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
391
285
return -1;
392
286
}
393
287
394
288
/* Create new empty GPGME data buffer for the plaintext */
395
289
rc = gpgme_data_new(&dh_plain);
396
290
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
400
293
gpgme_data_release(dh_crypto);
401
294
return -1;
402
295
}
403
296
404
297
/* Decrypt data from the cryptotext data buffer to the plaintext
405
298
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
300
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
410
303
plaintext_length = -1;
411
304
if(debug){
412
305
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
414
307
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
309
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
421
314
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
423
316
}
424
317
gpgme_recipient_t recipient;
425
318
recipient = result->recipients;
426
319
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
434
326
recipient = recipient->next;
435
327
}
436
328
}
439
331
}
440
332
441
333
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
335
}
444
336
445
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
448
340
plaintext_length = -1;
449
341
goto decrypt_end;
450
342
}
452
344
*plaintext = NULL;
453
345
while(true){
454
346
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
457
349
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
461
353
}
462
354
463
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
360
break;
469
361
}
470
362
if(ret < 0){
471
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
472
364
plaintext_length = -1;
473
365
goto decrypt_end;
474
366
}
476
368
}
477
369
478
370
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
480
372
for(ssize_t i = 0; i < plaintext_length; i++){
481
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
374
}
493
385
return plaintext_length;
494
386
}
495
387
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
392
ret = "(unknown)";
393
return ret;
507
394
}
508
395
509
396
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
397
static void debuggnutls(__attribute__((unused)) int level,
512
398
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
514
400
}
515
401
516
__attribute__((nonnull, warn_unused_result))
517
402
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
403
const char *seckeyfilename){
520
404
int ret;
521
unsigned int uret;
522
405
523
406
if(debug){
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
525
408
}
526
409
527
410
ret = gnutls_global_init();
528
411
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
530
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
531
414
return -1;
532
415
}
533
416
540
423
}
541
424
542
425
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
544
427
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
547
433
gnutls_global_deinit();
548
434
return -1;
549
435
}
550
436
551
437
if(debug){
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
554
pubkeyfilename,
555
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
556
441
}
557
442
558
443
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
560
445
GNUTLS_OPENPGP_FMT_BASE64);
561
446
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr,
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
567
452
goto globalfail;
568
453
}
569
454
570
455
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
572
457
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
576
460
goto globalfail;
577
461
}
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
463
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
683
466
goto globalfail;
684
467
}
685
468
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
687
470
688
471
return 0;
689
472
690
473
globalfail:
691
474
692
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
693
476
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
695
478
return -1;
696
479
}
697
480
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
701
482
int ret;
702
483
/* GnuTLS session creation */
703
484
do {
707
488
}
708
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
709
490
if(ret != GNUTLS_E_SUCCESS){
710
fprintf_plus(stderr,
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
713
493
}
714
494
715
495
{
716
496
const char *err;
717
497
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
719
499
if(quit_now){
720
500
gnutls_deinit(*session);
721
501
return -1;
722
502
}
723
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
724
504
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
728
508
gnutls_deinit(*session);
729
509
return -1;
730
510
}
732
512
733
513
do {
734
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
515
mc.cred);
736
516
if(quit_now){
737
517
gnutls_deinit(*session);
738
518
return -1;
739
519
}
740
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
741
521
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
744
524
gnutls_deinit(*session);
745
525
return -1;
746
526
}
748
528
/* ignore client certificate if any. */
749
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
530
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
752
532
753
533
return 0;
754
534
}
757
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
538
__attribute__((unused)) const char *txt){}
759
539
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
766
ret_errno = errno;
767
}
768
errno = old_errno;
769
return ret_errno;
770
}
771
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
778
errno = old_errno;
779
return ret_errno;
780
}
781
if(setuid(0) == -1){
782
ret_errno = errno;
783
}
784
errno = old_errno;
785
return ret_errno;
786
}
787
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
794
ret_errno = errno;
795
}
796
errno = old_errno;
797
return ret_errno;
798
}
799
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
806
ret_errno = errno;
807
}
808
errno = old_errno;
809
return ret_errno;
810
}
811
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
815
const char *address,
816
AvahiIfIndex if_index){
817
int ret;
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
824
if(debug){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
827
}
828
return false;
829
}
830
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
834
return false;
835
}
836
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
838
if(devnull == -1){
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
840
return false;
841
}
842
pid_t pid = fork();
843
if(pid == 0){
844
/* Child */
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
847
if(errno != 0){
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
850
} else {
851
/* Set group */
852
errno = 0;
853
ret = setgid(0);
854
if(ret == -1){
855
perror_plus("setgid");
856
_exit(EX_NOPERM);
857
}
858
/* Reset supplementary groups */
859
errno = 0;
860
ret = setgroups(0, NULL);
861
if(ret == -1){
862
perror_plus("setgroups");
863
_exit(EX_NOPERM);
864
}
865
}
866
ret = dup2(devnull, STDIN_FILENO);
867
if(ret == -1){
868
perror_plus("dup2(devnull, STDIN_FILENO)");
869
_exit(EX_OSERR);
870
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
872
if(ret == -1){
873
perror_plus("close");
874
_exit(EX_OSERR);
875
}
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
877
if(ret == -1){
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
879
_exit(EX_OSERR);
880
}
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
882
O_RDONLY
883
| O_DIRECTORY
884
| O_PATH
885
| O_CLOEXEC));
886
if(helperdir_fd == -1){
887
perror_plus("open");
888
_exit(EX_UNAVAILABLE);
889
}
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
891
helper, O_RDONLY));
892
if(helper_fd == -1){
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
895
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
897
#ifdef __GNUC__
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
900
#endif
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
904
environ) == -1){
905
#ifdef __GNUC__
906
#pragma GCC diagnostic pop
907
#endif
908
perror_plus("fexecve");
909
_exit(EXIT_FAILURE);
910
}
911
}
912
if(pid == -1){
913
perror_plus("fork");
914
return false;
915
}
916
int status;
917
pid_t pret = -1;
918
errno = 0;
919
do {
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
927
}
928
if(kill(pid, SIGTERM) == -1){
929
perror_plus("kill");
930
}
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
933
" helper program");
934
}
935
return false;
936
}
937
} while(pret == -1 and errno == EINTR);
938
if(pret == -1){
939
perror_plus("waitpid");
940
return false;
941
}
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
946
return false;
947
}
948
return true;
949
}
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
953
return false;
954
}
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
956
return false;
957
}
958
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
962
if(debug){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
964
}
965
return add_delete_local_route(true, address, if_index);
966
}
967
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
971
if(debug){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
973
}
974
return add_delete_local_route(false, address, if_index);
975
}
976
977
540
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
980
542
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
543
int af){
982
544
int ret, tcp_sd = -1;
983
545
ssize_t sret;
984
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
985
550
char *buffer = NULL;
986
551
char *decrypted_buffer = NULL;
987
552
size_t buffer_length = 0;
990
555
int retval = -1;
991
556
gnutls_session_t session;
992
557
int pf; /* Protocol family */
993
bool route_added = false;
994
558
995
559
errno = 0;
996
560
1007
571
pf = PF_INET;
1008
572
break;
1009
573
default:
1010
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
1011
575
errno = EINVAL;
1012
576
return -1;
1013
577
}
1014
578
1015
/* If the interface is specified and we have a list of interfaces */
1016
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1017
/* Check if the interface is one of the interfaces we are using */
1018
bool match = false;
1019
{
1020
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
match = true;
1025
break;
1026
}
1027
}
1028
}
1029
if(not match){
1030
/* This interface does not match any in the list, so we don't
1031
connect to the server */
1032
if(debug){
1033
char interface[IF_NAMESIZE];
1034
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1035
perror_plus("if_indextoname");
1036
} else {
1037
fprintf_plus(stderr, "Skipping server on non-used interface"
1038
" \"%s\"\n",
1039
if_indextoname((unsigned int)if_index,
1040
interface));
1041
}
1042
}
1043
return -1;
1044
}
1045
}
1046
1047
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
1048
580
if(ret != 0){
1049
581
return -1;
1050
582
}
1051
583
1052
584
if(debug){
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
1055
587
}
1056
588
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
1058
590
if(tcp_sd < 0){
1059
591
int e = errno;
1060
perror_plus("socket");
592
perror("socket");
1061
593
errno = e;
1062
594
goto mandos_end;
1063
595
}
1069
601
1070
602
memset(&to, 0, sizeof(to));
1071
603
if(af == AF_INET6){
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1074
606
} else { /* IPv4 */
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
1077
609
}
1078
610
if(ret < 0 ){
1079
611
int e = errno;
1080
perror_plus("inet_pton");
612
perror("inet_pton");
1081
613
errno = e;
1082
614
goto mandos_end;
1083
615
}
1084
616
if(ret == 0){
1085
617
int e = errno;
1086
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
1087
619
errno = e;
1088
620
goto mandos_end;
1089
621
}
1090
622
if(af == AF_INET6){
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
1094
630
if(if_index == AVAHI_IF_UNSPEC){
1095
fprintf_plus(stderr, "An IPv6 link-local address is"
1096
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
1097
633
errno = EINVAL;
1098
634
goto mandos_end;
1099
635
}
1100
636
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
1102
638
}
1103
639
} else {
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
1105
643
}
1106
644
1107
645
if(quit_now){
1113
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1114
652
char interface[IF_NAMESIZE];
1115
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
perror_plus("if_indextoname");
654
perror("if_indextoname");
1117
655
} else {
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1120
658
}
1121
659
} else {
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
1124
662
}
1125
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1127
if(af == AF_INET6){
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1131
NI_NUMERICHOST);
1132
} else {
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1136
NI_NUMERICHOST);
1137
}
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1144
}
1145
}
1146
1147
if(quit_now){
1148
errno = EINTR;
1149
goto mandos_end;
1150
}
1151
1152
while(true){
1153
if(af == AF_INET6){
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1156
} else {
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1159
}
1160
if(ret < 0){
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1167
&to)->sin6_addr)))
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1178
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1182
*/
1183
if(debug){
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1185
" direct route\n");
1186
}
1187
int e = errno;
1188
route_added = add_local_route(ip, if_index);
1189
if(route_added){
1190
continue;
1191
}
1192
errno = e;
1193
}
1194
if(errno != ECONNREFUSED or debug){
1195
int e = errno;
1196
perror_plus("connect");
1197
errno = e;
1198
}
1199
goto mandos_end;
1200
}
1201
1202
if(quit_now){
1203
errno = EINTR;
1204
goto mandos_end;
1205
}
1206
break;
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
679
}
680
}
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
int e = errno;
694
perror("connect");
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
1207
702
}
1208
703
1209
704
const char *out = mandos_protocol_version;
1211
706
while(true){
1212
707
size_t out_size = strlen(out);
1213
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1214
out_size - written));
709
out_size - written));
1215
710
if(ret == -1){
1216
711
int e = errno;
1217
perror_plus("write");
712
perror("write");
1218
713
errno = e;
1219
714
goto mandos_end;
1220
715
}
1237
732
}
1238
733
1239
734
if(debug){
1240
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1241
736
}
1242
737
1243
738
if(quit_now){
1245
740
goto mandos_end;
1246
741
}
1247
742
1248
/* This casting via intptr_t is to eliminate warning about casting
1249
an int to a pointer type. This is exactly how the GnuTLS Guile
1250
function "set-session-transport-fd!" does it. */
1251
gnutls_transport_set_ptr(session,
1252
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1253
744
1254
745
if(quit_now){
1255
746
errno = EINTR;
1266
757
1267
758
if(ret != GNUTLS_E_SUCCESS){
1268
759
if(debug){
1269
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1270
761
gnutls_perror(ret);
1271
762
}
1272
763
errno = EPROTO;
1276
767
/* Read OpenPGP packet that contains the wanted password */
1277
768
1278
769
if(debug){
1279
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1280
" %s\n", ip);
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
771
ip);
1281
772
}
1282
773
1283
774
while(true){
1288
779
}
1289
780
1290
781
buffer_capacity = incbuffer(&buffer, buffer_length,
1291
buffer_capacity);
782
buffer_capacity);
1292
783
if(buffer_capacity == 0){
1293
784
int e = errno;
1294
perror_plus("incbuffer");
785
perror("incbuffer");
1295
786
errno = e;
1296
787
goto mandos_end;
1297
788
}
1321
812
}
1322
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1323
814
if(ret < 0){
1324
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1325
"***\n");
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1326
816
gnutls_perror(ret);
1327
817
errno = EPROTO;
1328
818
goto mandos_end;
1329
819
}
1330
820
break;
1331
821
default:
1332
fprintf_plus(stderr, "Unknown error while reading data from"
1333
" encrypted session with Mandos server\n");
822
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
1334
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1335
825
errno = EIO;
1336
826
goto mandos_end;
1341
831
}
1342
832
1343
833
if(debug){
1344
fprintf_plus(stderr, "Closing TLS session\n");
834
fprintf(stderr, "Closing TLS session\n");
1345
835
}
1346
836
1347
837
if(quit_now){
1359
849
1360
850
if(buffer_length > 0){
1361
851
ssize_t decrypted_buffer_size;
1362
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1363
&decrypted_buffer, mc);
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
buffer_length,
854
&decrypted_buffer);
1364
855
if(decrypted_buffer_size >= 0){
1365
856
1366
857
written = 0;
1376
867
if(ret == 0 and ferror(stdout)){
1377
868
int e = errno;
1378
869
if(debug){
1379
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1380
strerror(errno));
870
fprintf(stderr, "Error writing encrypted data: %s\n",
871
strerror(errno));
1381
872
}
1382
873
errno = e;
1383
874
goto mandos_end;
1392
883
1393
884
mandos_end:
1394
885
{
1395
if(route_added){
1396
if(not delete_local_route(ip, if_index)){
1397
fprintf_plus(stderr, "Failed to delete local route to %s on"
1398
" interface %d", ip, if_index);
1399
}
1400
}
1401
886
int e = errno;
1402
887
free(decrypted_buffer);
1403
888
free(buffer);
1408
893
if(e == 0){
1409
894
e = errno;
1410
895
}
1411
perror_plus("close");
896
perror("close");
1412
897
}
1413
898
gnutls_deinit(session);
1414
errno = e;
1415
899
if(quit_now){
1416
errno = EINTR;
900
e = EINTR;
1417
901
retval = -1;
1418
902
}
903
errno = e;
1419
904
}
1420
905
return retval;
1421
906
}
1422
907
1423
__attribute__((nonnull))
1424
908
static void resolve_callback(AvahiSServiceResolver *r,
1425
909
AvahiIfIndex interface,
1426
910
AvahiProtocol proto,
1434
918
AVAHI_GCC_UNUSED AvahiStringList *txt,
1435
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1436
920
flags,
1437
void *mc){
1438
if(r == NULL){
1439
return;
1440
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(r);
1441
923
1442
924
/* Called whenever a service has been resolved successfully or
1443
925
timed out */
1444
926
1445
927
if(quit_now){
1446
avahi_s_service_resolver_free(r);
1447
928
return;
1448
929
}
1449
930
1450
931
switch(event){
1451
932
default:
1452
933
case AVAHI_RESOLVER_FAILURE:
1453
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1454
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1455
domain,
1456
avahi_strerror(avahi_server_errno
1457
(((mandos_context*)mc)->server)));
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
1458
937
break;
1459
938
1460
939
case AVAHI_RESOLVER_FOUND:
1462
941
char ip[AVAHI_ADDRESS_STR_MAX];
1463
942
avahi_address_snprint(ip, sizeof(ip), address);
1464
943
if(debug){
1465
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1466
PRIdMAX ") on port %" PRIu16 "\n", name,
1467
host_name, ip, (intmax_t)interface, port);
944
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
ip, (intmax_t)interface, port);
1468
947
}
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1470
interface,
1471
avahi_proto_to_af(proto),
1472
mc);
948
int ret = start_mandos_communication(ip, port, interface,
949
avahi_proto_to_af(proto));
1473
950
if(ret == 0){
1474
avahi_simple_poll_quit(simple_poll);
1475
} else {
1476
if(not add_server(ip, (in_port_t)port, interface,
1477
avahi_proto_to_af(proto),
1478
&((mandos_context*)mc)->current_server)){
1479
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1480
" list\n", name);
1481
}
951
avahi_simple_poll_quit(mc.simple_poll);
1482
952
}
1483
953
}
1484
954
}
1494
964
const char *domain,
1495
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
966
flags,
1497
void *mc){
1498
if(b == NULL){
1499
return;
1500
}
967
AVAHI_GCC_UNUSED void* userdata){
968
assert(b);
1501
969
1502
970
/* Called whenever a new services becomes available on the LAN or
1503
971
is removed from the LAN */
1510
978
default:
1511
979
case AVAHI_BROWSER_FAILURE:
1512
980
1513
fprintf_plus(stderr, "(Avahi browser) %s\n",
1514
avahi_strerror(avahi_server_errno
1515
(((mandos_context*)mc)->server)));
1516
avahi_simple_poll_quit(simple_poll);
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
1517
984
return;
1518
985
1519
986
case AVAHI_BROWSER_NEW:
1522
989
the callback function is called the Avahi server will free the
1523
990
resolver for us. */
1524
991
1525
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1526
interface, protocol, name, type,
1527
domain, protocol, 0,
1528
resolve_callback, mc) == NULL)
1529
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1530
" %s\n", name,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
1533
997
break;
1534
998
1535
999
case AVAHI_BROWSER_REMOVE:
1538
1002
case AVAHI_BROWSER_ALL_FOR_NOW:
1539
1003
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1540
1004
if(debug){
1541
fprintf_plus(stderr, "No Mandos server found, still"
1542
" searching...\n");
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1543
1006
}
1544
1007
break;
1545
1008
}
1546
1009
}
1547
1010
1548
/* Signal handler that stops main loop after SIGTERM */
1011
/* stop main loop after sigterm has been called */
1549
1012
static void handle_sigterm(int sig){
1550
1013
if(quit_now){
1551
1014
return;
1553
1016
quit_now = 1;
1554
1017
signal_received = sig;
1555
1018
int old_errno = errno;
1556
/* set main loop to exit */
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1559
1021
}
1560
1022
errno = old_errno;
1561
1023
}
1562
1024
1563
__attribute__((nonnull, warn_unused_result))
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
int ret;
1566
error_t ret_errno;
1567
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
if(s < 0){
1570
ret_errno = errno;
1571
perror_plus("socket");
1572
errno = ret_errno;
1573
return false;
1574
}
1575
strcpy(ifr->ifr_name, ifname);
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
if(ret == -1){
1578
if(debug){
1579
ret_errno = errno;
1580
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1582
}
1583
return false;
1584
}
1585
return true;
1586
}
1587
1588
__attribute__((nonnull, warn_unused_result))
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1590
1591
/* Reject the loopback device */
1592
if(ifr->ifr_flags & IFF_LOOPBACK){
1593
if(debug){
1594
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1595
ifname);
1596
}
1597
return false;
1598
}
1599
/* Accept point-to-point devices only if connect_to is specified */
1600
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1601
if(debug){
1602
fprintf_plus(stderr, "Accepting point-to-point interface"
1603
" \"%s\"\n", ifname);
1604
}
1605
return true;
1606
}
1607
/* Otherwise, reject non-broadcast-capable devices */
1608
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1609
if(debug){
1610
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1611
" \"%s\"\n", ifname);
1612
}
1613
return false;
1614
}
1615
/* Reject non-ARP interfaces (including dummy interfaces) */
1616
if(ifr->ifr_flags & IFF_NOARP){
1617
if(debug){
1618
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1619
ifname);
1620
}
1621
return false;
1622
}
1623
1624
/* Accept this device */
1625
if(debug){
1626
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1627
}
1628
return true;
1629
}
1630
1631
1025
/*
1632
1026
* This function determines if a directory entry in /sys/class/net
1633
1027
* corresponds to an acceptable network device.
1634
1028
* (This function is passed to scandir(3) as a filter function.)
1635
1029
*/
1636
__attribute__((nonnull, warn_unused_result))
1637
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1638
1039
if(if_entry->d_name[0] == '.'){
1639
1040
return 0;
1640
1041
}
1641
1642
struct ifreq ifr;
1643
if(not get_flags(if_entry->d_name, &ifr)){
1644
if(debug){
1645
fprintf_plus(stderr, "Failed to get flags for interface "
1646
"\"%s\"\n", if_entry->d_name);
1647
}
1648
return 0;
1649
}
1650
1651
if(not good_flags(if_entry->d_name, &ifr)){
1652
return 0;
1653
}
1654
return 1;
1655
}
1656
1657
/*
1658
* This function determines if a network interface is up.
1659
*/
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1662
struct ifreq ifr;
1663
if(not get_flags(interface, &ifr)){
1664
if(debug){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1667
}
1668
return false;
1669
}
1670
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1672
}
1673
1674
/*
1675
* This function determines if a network interface is running
1676
*/
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1679
struct ifreq ifr;
1680
if(not get_flags(interface, &ifr)){
1681
if(debug){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1684
}
1685
return false;
1686
}
1687
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1689
}
1690
1691
__attribute__((nonnull, pure, warn_unused_result))
1692
int notdotentries(const struct dirent *direntry){
1693
/* Skip "." and ".." */
1694
if(direntry->d_name[0] == '.'
1695
and (direntry->d_name[1] == '\0'
1696
or (direntry->d_name[1] == '.'
1697
and direntry->d_name[2] == '\0'))){
1698
return 0;
1699
}
1700
return 1;
1701
}
1702
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
int runnable_hook(const struct dirent *direntry){
1706
int ret;
1707
size_t sret;
1708
struct stat st;
1709
1710
if((direntry->d_name)[0] == '\0'){
1711
/* Empty name? */
1712
return 0;
1713
}
1714
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
"abcdefghijklmnopqrstuvwxyz"
1717
"0123456789"
1718
"_.-");
1719
if((direntry->d_name)[sret] != '\0'){
1720
/* Contains non-allowed characters */
1721
if(debug){
1722
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1723
direntry->d_name);
1724
}
1725
return 0;
1726
}
1727
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1729
if(ret == -1){
1730
if(debug){
1731
perror_plus("Could not stat hook");
1732
}
1733
return 0;
1734
}
1735
if(not (S_ISREG(st.st_mode))){
1736
/* Not a regular file */
1737
if(debug){
1738
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1739
direntry->d_name);
1740
}
1741
return 0;
1742
}
1743
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1744
/* Not executable */
1745
if(debug){
1746
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1747
direntry->d_name);
1748
}
1749
return 0;
1750
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1751
1113
if(debug){
1752
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1753
direntry->d_name);
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1754
1116
}
1755
1117
return 1;
1756
1118
}
1757
1119
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1761
int ret;
1762
struct timespec now;
1763
struct timespec waited_time;
1764
intmax_t block_time;
1765
1766
while(true){
1767
if(mc->current_server == NULL){
1768
if(debug){
1769
fprintf_plus(stderr, "Wait until first server is found."
1770
" No timeout!\n");
1771
}
1772
ret = avahi_simple_poll_iterate(s, -1);
1773
} else {
1774
if(debug){
1775
fprintf_plus(stderr, "Check current_server if we should run"
1776
" it, or wait\n");
1777
}
1778
/* the current time */
1779
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1780
if(ret == -1){
1781
perror_plus("clock_gettime");
1782
return -1;
1783
}
1784
/* Calculating in ms how long time between now and server
1785
who we visted longest time ago. Now - last seen. */
1786
waited_time.tv_sec = (now.tv_sec
1787
- mc->current_server->last_seen.tv_sec);
1788
waited_time.tv_nsec = (now.tv_nsec
1789
- mc->current_server->last_seen.tv_nsec);
1790
/* total time is 10s/10,000ms.
1791
Converting to s from ms by dividing by 1,000,
1792
and ns to ms by dividing by 1,000,000. */
1793
block_time = ((retry_interval
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1796
1797
if(debug){
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1799
block_time);
1800
}
1801
1802
if(block_time <= 0){
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1807
if(ret == 0){
1808
avahi_simple_poll_quit(s);
1809
return 0;
1810
}
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1812
&mc->current_server->last_seen);
1813
if(ret == -1){
1814
perror_plus("clock_gettime");
1815
return -1;
1816
}
1817
mc->current_server = mc->current_server->next;
1818
block_time = 0; /* Call avahi to find new Mandos
1819
servers, but don't block */
1820
}
1821
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1823
}
1824
if(ret != 0){
1825
if(ret > 0 or errno != EINTR){
1826
return (ret != 1) ? ret : 0;
1827
}
1828
}
1829
}
1830
}
1831
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1834
const float delay){
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1838
| O_CLOEXEC);
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1841
if(debug){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1844
}
1845
} else {
1846
perror_plus("open");
1847
}
1848
return;
1849
}
1850
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
1863
if(numhooks == -1){
1864
perror_plus("scandir");
1865
return;
1866
}
1867
struct dirent *direntry;
1868
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1876
if(debug){
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1878
direntry->d_name);
1879
}
1880
pid_t hook_pid = fork();
1881
if(hook_pid == 0){
1882
/* Child */
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1885
if(errno != 0){
1886
perror_plus("Failed to raise privileges");
1887
_exit(EX_NOPERM);
1888
}
1889
/* Set group */
1890
errno = 0;
1891
ret = setgid(0);
1892
if(ret == -1){
1893
perror_plus("setgid");
1894
_exit(EX_NOPERM);
1895
}
1896
/* Reset supplementary groups */
1897
errno = 0;
1898
ret = setgroups(0, NULL);
1899
if(ret == -1){
1900
perror_plus("setgroups");
1901
_exit(EX_NOPERM);
1902
}
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1904
if(ret == -1){
1905
perror_plus("setenv");
1906
_exit(EX_OSERR);
1907
}
1908
ret = setenv("DEVICE", interface, 1);
1909
if(ret == -1){
1910
perror_plus("setenv");
1911
_exit(EX_OSERR);
1912
}
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1914
if(ret == -1){
1915
perror_plus("setenv");
1916
_exit(EX_OSERR);
1917
}
1918
ret = setenv("MODE", mode, 1);
1919
if(ret == -1){
1920
perror_plus("setenv");
1921
_exit(EX_OSERR);
1922
}
1923
char *delaystring;
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1925
if(ret == -1){
1926
perror_plus("asprintf");
1927
_exit(EX_OSERR);
1928
}
1929
ret = setenv("DELAY", delaystring, 1);
1930
if(ret == -1){
1931
free(delaystring);
1932
perror_plus("setenv");
1933
_exit(EX_OSERR);
1934
}
1935
free(delaystring);
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1938
if(ret == -1){
1939
perror_plus("setenv");
1940
_exit(EX_OSERR);
1941
}
1942
}
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1944
direntry->d_name,
1945
O_RDONLY));
1946
if(hook_fd == -1){
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1949
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1953
}
1954
ret = dup2(devnull, STDIN_FILENO);
1955
if(ret == -1){
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
_exit(EX_OSERR);
1958
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1960
if(ret == -1){
1961
perror_plus("close");
1962
_exit(EX_OSERR);
1963
}
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1965
if(ret == -1){
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1967
_exit(EX_OSERR);
1968
}
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1970
environ) == -1){
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1973
}
1974
} else {
1975
if(hook_pid == -1){
1976
perror_plus("fork");
1977
free(direntry);
1978
continue;
1979
}
1980
int status;
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1983
free(direntry);
1984
continue;
1985
}
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1991
free(direntry);
1992
continue;
1993
}
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
1997
WTERMSIG(status));
1998
free(direntry);
1999
continue;
2000
} else {
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2003
free(direntry);
2004
continue;
2005
}
2006
}
2007
if(debug){
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2009
direntry->d_name);
2010
}
2011
free(direntry);
2012
}
2013
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2016
} else {
2017
hookdir_fd = -1;
2018
}
2019
close(devnull);
2020
}
2021
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2026
int ret;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2029
if(if_index == 0){
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2031
errno = old_errno;
2032
return ENXIO;
2033
}
2034
2035
if(quit_now){
2036
errno = old_errno;
2037
return EINTR;
2038
}
2039
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags |= IFF_UP; /* set flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2061
if(ret == -1){
2062
perror_plus("close");
2063
}
2064
errno = old_errno;
2065
return EINTR;
2066
}
2067
2068
if(debug){
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2070
interface);
2071
}
2072
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2075
if(ret_errno != 0){
2076
errno = ret_errno;
2077
perror_plus("Failed to raise privileges");
2078
}
2079
2080
#ifdef __linux__
2081
int ret_linux;
2082
bool restore_loglevel = false;
2083
if(ret_errno == 0){
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2089
} else {
2090
restore_loglevel = true;
2091
}
2092
}
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2096
#ifdef __linux__
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2101
}
2102
}
2103
#endif /* __linux__ */
2104
2105
/* If raise_privileges() succeeded above */
2106
if(ret_errno == 0){
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2109
if(ret_errno != 0){
2110
errno = ret_errno;
2111
perror_plus("Failed to lower privileges");
2112
}
2113
}
2114
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2117
if(ret == -1){
2118
perror_plus("close");
2119
}
2120
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2124
errno = old_errno;
2125
return ioctl_errno;
2126
}
2127
} else if(debug){
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2129
interface);
2130
}
2131
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2136
break;
2137
}
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2142
}
2143
}
2144
2145
errno = old_errno;
2146
return 0;
2147
}
2148
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2154
if(if_index == 0){
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2156
errno = old_errno;
2157
return ENXIO;
2158
}
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2162
ret_errno = errno;
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2165
errno = old_errno;
2166
return ret_errno;
2167
}
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2171
if(sd == -1){
2172
ret_errno = errno;
2173
perror_plus("socket");
2174
errno = old_errno;
2175
return ret_errno;
2176
}
2177
2178
if(debug){
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2180
interface);
2181
}
2182
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2185
if(ret_errno != 0){
2186
errno = ret_errno;
2187
perror_plus("Failed to raise privileges");
2188
}
2189
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2192
2193
/* If raise_privileges() succeeded above */
2194
if(ret_errno == 0){
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2197
if(ret_errno != 0){
2198
errno = ret_errno;
2199
perror_plus("Failed to lower privileges");
2200
}
2201
}
2202
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2205
if(ret == -1){
2206
perror_plus("close");
2207
}
2208
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2212
errno = old_errno;
2213
return ioctl_errno;
2214
}
2215
} else if(debug){
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2217
interface);
2218
}
2219
2220
errno = old_errno;
2221
return 0;
2222
}
2223
2224
1120
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2229
1121
AvahiSServiceBrowser *sb = NULL;
2230
error_t ret_errno;
1122
int error;
2231
1123
int ret;
2232
1124
intmax_t tmpmax;
2233
1125
char *tmp;
2234
1126
int exitcode = EXIT_SUCCESS;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
1127
const char *interface = "";
1128
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
1131
uid_t uid;
1132
gid_t gid;
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1134
bool tempdir_created = false;
2240
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
1136
const char *seckey = PATHDIR "/" SECKEY;
2242
1137
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2244
1138
2245
1139
bool gnutls_initialized = false;
2246
1140
bool gpgme_initialized = false;
2247
1141
float delay = 2.5f;
2248
double retry_interval = 10; /* 10s between trying a server and
2249
retrying the same server again */
2250
1142
2251
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2252
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2258
1150
errno = 0;
2259
1151
ret = setgid(gid);
2260
1152
if(ret == -1){
2261
perror_plus("setgid");
1153
perror("setgid");
2262
1154
}
2263
1155
2264
1156
/* Lower user privileges (temporarily) */
2265
1157
errno = 0;
2266
1158
ret = seteuid(uid);
2267
1159
if(ret == -1){
2268
perror_plus("seteuid");
1160
perror("seteuid");
2269
1161
}
2270
1162
2271
1163
if(quit_now){
2306
1198
.arg = "SECONDS",
2307
1199
.doc = "Maximum delay to wait for interface startup",
2308
1200
.group = 2 },
2309
{ .name = "retry", .key = 132,
2310
.arg = "SECONDS",
2311
.doc = "Retry interval used when denied by the Mandos server",
2312
.group = 2 },
2313
{ .name = "network-hook-dir", .key = 133,
2314
.arg = "DIR",
2315
.doc = "Directory where network hooks are located",
2316
.group = 2 },
2317
1201
/*
2318
1202
* These reproduce what we would get without ARGP_NO_HELP
2319
1203
*/
2337
1221
connect_to = arg;
2338
1222
break;
2339
1223
case 'i': /* --interface */
2340
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2341
arg, (int)',');
2342
if(ret_errno != 0){
2343
argp_error(state, "%s", strerror(ret_errno));
2344
}
1224
interface = arg;
2345
1225
break;
2346
1226
case 's': /* --seckey */
2347
1227
seckey = arg;
2367
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
2368
1248
argp_error(state, "Bad delay");
2369
1249
}
2370
case 132: /* --retry */
2371
errno = 0;
2372
retry_interval = strtod(arg, &tmp);
2373
if(errno != 0 or tmp == arg or *tmp != '\0'
2374
or (retry_interval * 1000) > INT_MAX
2375
or retry_interval < 0){
2376
argp_error(state, "Bad retry interval");
2377
}
2378
break;
2379
case 133: /* --network-hook-dir */
2380
hookdir = arg;
2381
1250
break;
2382
1251
/*
2383
1252
* These reproduce what we would get without ARGP_NO_HELP
2390
1259
argp_state_help(state, state->out_stream,
2391
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2392
1261
case 'V': /* --version */
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
2394
1263
exit(argp_err_exit_status);
2395
1264
break;
2396
1265
default:
2411
1280
case ENOMEM:
2412
1281
default:
2413
1282
errno = ret;
2414
perror_plus("argp_parse");
1283
perror("argp_parse");
2415
1284
exitcode = EX_OSERR;
2416
1285
goto end;
2417
1286
case EINVAL:
2420
1289
}
2421
1290
}
2422
1291
2423
{
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2426
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
2432
} else {
2433
struct stat st;
2434
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2436
int seckey_fd = open(seckey, O_RDONLY);
2437
if(seckey_fd == -1){
2438
perror_plus("open");
2439
} else {
2440
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2441
if(ret == -1){
2442
perror_plus("fstat");
2443
} else {
2444
if(S_ISREG(st.st_mode)
2445
and st.st_uid == 0 and st.st_gid == 0){
2446
ret = fchown(seckey_fd, uid, gid);
2447
if(ret == -1){
2448
perror_plus("fchown");
2449
}
2450
}
2451
}
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2453
}
2454
}
2455
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
int pubkey_fd = open(pubkey, O_RDONLY);
2458
if(pubkey_fd == -1){
2459
perror_plus("open");
2460
} else {
2461
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2462
if(ret == -1){
2463
perror_plus("fstat");
2464
} else {
2465
if(S_ISREG(st.st_mode)
2466
and st.st_uid == 0 and st.st_gid == 0){
2467
ret = fchown(pubkey_fd, uid, gid);
2468
if(ret == -1){
2469
perror_plus("fchown");
2470
}
2471
}
2472
}
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2474
}
2475
}
2476
2477
/* Lower privileges */
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2481
perror_plus("Failed to lower privileges");
2482
}
2483
}
2484
}
2485
2486
/* Remove invalid interface names (except "none") */
2487
{
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2490
interface))){
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2496
}
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2498
interface = NULL;
2499
}
2500
}
2501
}
2502
2503
/* Run network hooks */
2504
{
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2509
goto end;
2510
}
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2513
}
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
2516
}
2517
2518
1292
if(not debug){
2519
1293
avahi_set_log_function(empty_log);
2520
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
2521
1320
2522
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2523
1322
from the signal handler */
2524
1323
/* Initialize the pseudo-RNG for Avahi */
2525
1324
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
2528
fprintf_plus(stderr,
2529
"Avahi: Failed to create simple poll object.\n");
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2530
1328
exitcode = EX_UNAVAILABLE;
2531
1329
goto end;
2532
1330
}
2534
1332
sigemptyset(&sigterm_action.sa_mask);
2535
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2536
1334
if(ret == -1){
2537
perror_plus("sigaddset");
1335
perror("sigaddset");
2538
1336
exitcode = EX_OSERR;
2539
1337
goto end;
2540
1338
}
2541
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2542
1340
if(ret == -1){
2543
perror_plus("sigaddset");
1341
perror("sigaddset");
2544
1342
exitcode = EX_OSERR;
2545
1343
goto end;
2546
1344
}
2547
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2548
1346
if(ret == -1){
2549
perror_plus("sigaddset");
1347
perror("sigaddset");
2550
1348
exitcode = EX_OSERR;
2551
1349
goto end;
2552
1350
}
2556
1354
*/
2557
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2558
1356
if(ret == -1){
2559
perror_plus("sigaction");
1357
perror("sigaction");
2560
1358
return EX_OSERR;
2561
1359
}
2562
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
2563
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
2564
1362
if(ret == -1){
2565
perror_plus("sigaction");
1363
perror("sigaction");
2566
1364
exitcode = EX_OSERR;
2567
1365
goto end;
2568
1366
}
2569
1367
}
2570
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2571
1369
if(ret == -1){
2572
perror_plus("sigaction");
1370
perror("sigaction");
2573
1371
return EX_OSERR;
2574
1372
}
2575
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
2576
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2577
1375
if(ret == -1){
2578
perror_plus("sigaction");
1376
perror("sigaction");
2579
1377
exitcode = EX_OSERR;
2580
1378
goto end;
2581
1379
}
2582
1380
}
2583
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2584
1382
if(ret == -1){
2585
perror_plus("sigaction");
1383
perror("sigaction");
2586
1384
return EX_OSERR;
2587
1385
}
2588
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
2589
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2590
1388
if(ret == -1){
2591
perror_plus("sigaction");
1389
perror("sigaction");
2592
1390
exitcode = EX_OSERR;
2593
1391
goto end;
2594
1392
}
2595
1393
}
2596
1394
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2602
alphasort);
2603
if(ret >= 1){
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2608
if(ret_errno != 0){
2609
errno = ret_errno;
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2612
continue;
2613
}
2614
if(debug){
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2617
}
2618
free(direntries[i]);
2619
}
2620
free(direntries);
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1415
#ifdef __linux__
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1420
if(ret == -1){
1421
restore_loglevel = false;
1422
perror("klogctl");
1423
}
1424
#endif /* __linux__ */
1425
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
1428
perror("socket");
1429
exitcode = EX_OSERR;
1430
#ifdef __linux__
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
goto end;
1445
}
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1450
#ifdef __linux__
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1465
goto end;
1466
}
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1475
#ifdef __linux__
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
}
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1498
break;
1499
}
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1504
}
1505
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1512
}
1513
#ifdef __linux__
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
2621
1530
} else {
2622
if(ret == 0){
2623
free(direntries);
2624
}
2625
fprintf_plus(stderr, "Could not find a network interface\n");
2626
exitcode = EXIT_FAILURE;
2627
goto end;
2628
}
2629
}
2630
2631
/* Bring up interfaces which are down, and remove any "none"s */
2632
{
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2635
interface))){
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2640
interface);
2641
interface = NULL;
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
2646
interface);
2647
interface = NULL;
2648
}
2649
}
2650
break;
2651
}
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2655
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2657
} else {
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2660
interface);
2661
if(errno != 0){
2662
perror_plus("argz_add");
2663
}
2664
}
2665
}
2666
}
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2669
}
2670
}
2671
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2674
if(debug){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2676
mc.interfaces);
2677
}
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
2679
1537
}
2680
1538
2681
1539
if(quit_now){
2682
1540
goto end;
2683
1541
}
2684
1542
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
1543
ret = init_gnutls_global(pubkey, seckey);
2686
1544
if(ret == -1){
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
1545
fprintf(stderr, "init_gnutls_global failed\n");
2688
1546
exitcode = EX_UNAVAILABLE;
2689
1547
goto end;
2690
1548
} else {
2695
1553
goto end;
2696
1554
}
2697
1555
2698
/* Try /run/tmp before /tmp */
2699
tempdir = mkdtemp(run_tempdir);
2700
if(tempdir == NULL and errno == ENOENT){
2701
if(debug){
2702
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2703
run_tempdir, old_tempdir);
2704
}
2705
tempdir = mkdtemp(old_tempdir);
2706
}
2707
if(tempdir == NULL){
2708
perror_plus("mkdtemp");
1556
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
2709
1560
goto end;
2710
1561
}
2711
1562
2713
1564
goto end;
2714
1565
}
2715
1566
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2717
fprintf_plus(stderr, "init_gpgme failed\n");
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
2718
1569
exitcode = EX_UNAVAILABLE;
2719
1570
goto end;
2720
1571
} else {
2729
1580
/* Connect directly, do not use Zeroconf */
2730
1581
/* (Mainly meant for debugging) */
2731
1582
char *address = strrchr(connect_to, ':');
2732
2733
1583
if(address == NULL){
2734
fprintf_plus(stderr, "No colon in address\n");
1584
fprintf(stderr, "No colon in address\n");
2735
1585
exitcode = EX_USAGE;
2736
1586
goto end;
2737
1587
}
2740
1590
goto end;
2741
1591
}
2742
1592
2743
in_port_t port;
1593
uint16_t port;
2744
1594
errno = 0;
2745
1595
tmpmax = strtoimax(address+1, &tmp, 10);
2746
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2747
or tmpmax != (in_port_t)tmpmax){
2748
fprintf_plus(stderr, "Bad port number\n");
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
2749
1599
exitcode = EX_USAGE;
2750
1600
goto end;
2751
1601
}
2752
1602
2753
1603
if(quit_now){
2754
1604
goto end;
2755
1605
}
2756
1606
2757
port = (in_port_t)tmpmax;
1607
port = (uint16_t)tmpmax;
2758
1608
*address = '\0';
1609
address = connect_to;
2759
1610
/* Colon in address indicates IPv6 */
2760
1611
int af;
2761
if(strchr(connect_to, ':') != NULL){
1612
if(strchr(address, ':') != NULL){
2762
1613
af = AF_INET6;
2763
/* Accept [] around IPv6 address - see RFC 5952 */
2764
if(connect_to[0] == '[' and address[-1] == ']')
2765
{
2766
connect_to++;
2767
address[-1] = '\0';
2768
}
2769
1614
} else {
2770
1615
af = AF_INET;
2771
1616
}
2772
address = connect_to;
2773
1617
2774
1618
if(quit_now){
2775
1619
goto end;
2776
1620
}
2777
1621
2778
while(not quit_now){
2779
ret = start_mandos_communication(address, port, if_index, af,
2780
&mc);
2781
if(quit_now or ret == 0){
2782
break;
2783
}
2784
if(debug){
2785
fprintf_plus(stderr, "Retrying in %d seconds\n",
2786
(int)retry_interval);
2787
}
2788
sleep((unsigned int)retry_interval);
2789
}
2790
2791
if(not quit_now){
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
2792
1644
exitcode = EXIT_SUCCESS;
2793
1645
}
2794
2795
1646
goto end;
2796
1647
}
2797
1648
2809
1660
config.publish_domain = 0;
2810
1661
2811
1662
/* Allocate a new server */
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
2814
1666
2815
1667
/* Free the Avahi configuration data */
2816
1668
avahi_server_config_free(&config);
2818
1670
2819
1671
/* Check if creating the Avahi server object succeeded */
2820
1672
if(mc.server == NULL){
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2823
1675
exitcode = EX_UNAVAILABLE;
2824
1676
goto end;
2825
1677
}
2831
1683
/* Create the Avahi service browser */
2832
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
2833
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2834
NULL, 0, browse_callback,
2835
(void *)&mc);
1686
NULL, 0, browse_callback, NULL);
2836
1687
if(sb == NULL){
2837
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2838
avahi_strerror(avahi_server_errno(mc.server)));
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2839
1690
exitcode = EX_UNAVAILABLE;
2840
1691
goto end;
2841
1692
}
2847
1698
/* Run the main loop */
2848
1699
2849
1700
if(debug){
2850
fprintf_plus(stderr, "Starting Avahi loop search\n");
1701
fprintf(stderr, "Starting Avahi loop search\n");
2851
1702
}
2852
1703
2853
ret = avahi_loop_with_timeout(simple_poll,
2854
(int)(retry_interval * 1000), &mc);
2855
if(debug){
2856
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2857
(ret == 0) ? "successfully" : "with error");
2858
}
1704
avahi_simple_poll_loop(mc.simple_poll);
2859
1705
2860
1706
end:
2861
1707
2862
1708
if(debug){
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2864
1710
}
2865
1711
2866
1712
/* Cleanup things */
2867
free(mc.interfaces);
2868
2869
1713
if(sb != NULL)
2870
1714
avahi_s_service_browser_free(sb);
2871
1715
2872
1716
if(mc.server != NULL)
2873
1717
avahi_server_free(mc.server);
2874
1718
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
2877
1721
2878
1722
if(gnutls_initialized){
2879
1723
gnutls_certificate_free_credentials(mc.cred);
2885
1729
gpgme_release(mc.ctx);
2886
1730
}
2887
1731
2888
/* Cleans up the circular linked list of Mandos servers the client
2889
has seen */
2890
if(mc.current_server != NULL){
2891
mc.current_server->prev->next = NULL;
2892
while(mc.current_server != NULL){
2893
server *next = mc.current_server->next;
2894
#ifdef __GNUC__
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2897
#endif
2898
free((char *)(mc.current_server->ip));
2899
#ifdef __GNUC__
2900
#pragma GCC diagnostic pop
2901
#endif
2902
free(mc.current_server);
2903
mc.current_server = next;
2904
}
2905
}
2906
2907
/* Re-raise privileges */
2908
{
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
2912
perror_plus("Failed to raise privileges");
2913
} else {
2914
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2918
2919
/* Take down the network interfaces which were brought up */
2920
{
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
2928
perror_plus("Failed to take down interface");
2929
}
2930
}
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2933
" down\n");
2934
}
2935
}
2936
}
2937
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
2941
perror_plus("Failed to lower privileges permanently");
2942
}
2943
}
2944
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2947
2948
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2990
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
2992
1805
}
2993
1806
}
2994
1807
2999
1812
&old_sigterm_action,
3000
1813
NULL));
3001
1814
if(ret == -1){
3002
perror_plus("sigaction");
1815
perror("sigaction");
3003
1816
}
3004
1817
do {
3005
1818
ret = raise(signal_received);
3006
1819
} while(ret != 0 and errno == EINTR);
3007
1820
if(ret != 0){
3008
perror_plus("raise");
1821
perror("raise");
3009
1822
abort();
3010
1823
}
3011
1824
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0