To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 426
- compare with another revision
- download diff
- download tarball
- view history from revision 426
- Committer: Teddy Hogeborn
- Date: 2010-09-12 03:22:48 UTC
- Revision ID: teddy@fukt.bsnet.se-20100912032248-6cizkymqivr5uzwm
* Makefile (run-server): Remove warning about now-eliminated error.
- files removed:
- debian/source
- network-hooks.d
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
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
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
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
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
87
92
88
#ifdef __linux__
93
89
#include <sys/klog.h> /* klogctl() */
111
107
init_gnutls_session(),
112
108
GNUTLS_* */
113
109
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
116
112
117
113
/* GPGME */
118
114
#include <gpgme.h> /* All GPGME types, constants and
126
122
#define PATHDIR "/conf/conf.d/mandos"
127
123
#define SECKEY "seckey.txt"
128
124
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
125
131
126
bool debug = false;
132
127
static const char mandos_protocol_version[] = "1";
133
128
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
130
static const char sys_class_net[] = "/sys/class/net";
136
131
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
149
132
150
133
/* Used for passing in values through the Avahi callback functions */
151
134
typedef struct {
156
139
gnutls_dh_params_t dh_params;
157
140
const char *priority;
158
141
gpgme_ctx_t ctx;
159
server *current_server;
160
142
} mandos_context;
161
143
162
144
/* global context so signal handler can reach it*/
163
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
146
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
167
148
168
149
sig_atomic_t quit_now = 0;
169
150
int signal_received = 0;
170
151
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
152
/*
191
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
154
* bytes. "buffer_capacity" is how much is currently allocated,
193
155
* "buffer_length" is how much is already used.
194
156
*/
195
157
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
158
size_t buffer_capacity){
197
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
161
if(buffer == NULL){
204
166
return buffer_capacity;
205
167
}
206
168
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
244
169
/*
245
170
* Initialize GPGME.
246
171
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
249
174
gpgme_error_t rc;
250
175
gpgme_engine_info_t engine_info;
251
176
260
185
261
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
187
if(fd == -1){
263
perror_plus("open");
188
perror("open");
264
189
return false;
265
190
}
266
191
267
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
193
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
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));
271
196
return false;
272
197
}
273
198
274
199
rc = gpgme_op_import(mc.ctx, pgp_data);
275
200
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
278
203
return false;
279
204
}
280
205
281
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
207
if(ret == -1){
283
perror_plus("close");
208
perror("close");
284
209
}
285
210
gpgme_data_release(pgp_data);
286
211
return true;
287
212
}
288
213
289
214
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
291
216
}
292
217
293
218
/* Init GPGME */
294
219
gpgme_check_version(NULL);
295
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
221
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
299
224
return false;
300
225
}
301
226
302
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
303
228
rc = gpgme_get_engine_info(&engine_info);
304
229
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
307
232
return false;
308
233
}
309
234
while(engine_info != NULL){
315
240
engine_info = engine_info->next;
316
241
}
317
242
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
244
return false;
321
245
}
322
246
323
247
/* Create new GPGME "context" */
324
248
rc = gpgme_new(&(mc.ctx));
325
249
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
329
252
return false;
330
253
}
331
254
350
273
ssize_t plaintext_length = 0;
351
274
352
275
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
277
}
355
278
356
279
/* Create new GPGME data buffer from memory cryptotext */
357
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
281
0);
359
282
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
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));
362
285
return -1;
363
286
}
364
287
365
288
/* Create new empty GPGME data buffer for the plaintext */
366
289
rc = gpgme_data_new(&dh_plain);
367
290
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
371
293
gpgme_data_release(dh_crypto);
372
294
return -1;
373
295
}
376
298
data buffer */
377
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
300
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
381
303
plaintext_length = -1;
382
304
if(debug){
383
305
gpgme_decrypt_result_t result;
384
306
result = gpgme_op_decrypt_result(mc.ctx);
385
307
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
309
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
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);
392
314
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
394
316
}
395
317
gpgme_recipient_t recipient;
396
318
recipient = result->recipients;
397
319
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "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");
405
326
recipient = recipient->next;
406
327
}
407
328
}
410
331
}
411
332
412
333
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
335
}
415
336
416
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
417
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
419
340
plaintext_length = -1;
420
341
goto decrypt_end;
421
342
}
423
344
*plaintext = NULL;
424
345
while(true){
425
346
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
428
349
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
432
353
}
433
354
434
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
439
360
break;
440
361
}
441
362
if(ret < 0){
442
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
443
364
plaintext_length = -1;
444
365
goto decrypt_end;
445
366
}
447
368
}
448
369
449
370
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
451
372
for(ssize_t i = 0; i < plaintext_length; i++){
452
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
374
}
475
396
/* GnuTLS log function callback */
476
397
static void debuggnutls(__attribute__((unused)) int level,
477
398
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
479
400
}
480
401
481
402
static int init_gnutls_global(const char *pubkeyfilename,
483
404
int ret;
484
405
485
406
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
487
408
}
488
409
489
410
ret = gnutls_global_init();
490
411
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
493
414
return -1;
494
415
}
495
416
502
423
}
503
424
504
425
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
506
427
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
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));
509
433
gnutls_global_deinit();
510
434
return -1;
511
435
}
512
436
513
437
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
518
441
}
519
442
520
443
ret = gnutls_certificate_set_openpgp_key_file
521
444
(mc.cred, pubkeyfilename, seckeyfilename,
522
445
GNUTLS_OPENPGP_FMT_BASE64);
523
446
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
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));
529
452
goto globalfail;
530
453
}
531
454
532
455
/* GnuTLS server initialization */
533
456
ret = gnutls_dh_params_init(&mc.dh_params);
534
457
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
538
460
goto globalfail;
539
461
}
540
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
463
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
544
466
goto globalfail;
545
467
}
546
468
566
488
}
567
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
490
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
572
493
}
573
494
574
495
{
581
502
}
582
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
504
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
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));
587
508
gnutls_deinit(*session);
588
509
return -1;
589
510
}
598
519
}
599
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
521
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
603
524
gnutls_deinit(*session);
604
525
return -1;
605
526
}
650
571
pf = PF_INET;
651
572
break;
652
573
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
654
575
errno = EINVAL;
655
576
return -1;
656
577
}
661
582
}
662
583
663
584
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
666
587
}
667
588
668
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
590
if(tcp_sd < 0){
670
591
int e = errno;
671
perror_plus("socket");
592
perror("socket");
672
593
errno = e;
673
594
goto mandos_end;
674
595
}
688
609
}
689
610
if(ret < 0 ){
690
611
int e = errno;
691
perror_plus("inet_pton");
612
perror("inet_pton");
692
613
errno = e;
693
614
goto mandos_end;
694
615
}
695
616
if(ret == 0){
696
617
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
698
619
errno = e;
699
620
goto mandos_end;
700
621
}
705
626
706
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
629
-Wunreachable-code*/
709
630
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
712
633
errno = EINVAL;
713
634
goto mandos_end;
714
635
}
730
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
652
char interface[IF_NAMESIZE];
732
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
654
perror("if_indextoname");
734
655
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
737
658
}
738
659
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
741
662
}
742
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
671
sizeof(addrstr));
751
672
}
752
673
if(pcret == NULL){
753
perror_plus("inet_ntop");
674
perror("inet_ntop");
754
675
} else {
755
676
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
678
}
758
679
}
759
680
}
769
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
691
}
771
692
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
693
int e = errno;
694
perror("connect");
695
errno = e;
777
696
goto mandos_end;
778
697
}
779
698
787
706
while(true){
788
707
size_t out_size = strlen(out);
789
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
709
out_size - written));
791
710
if(ret == -1){
792
711
int e = errno;
793
perror_plus("write");
712
perror("write");
794
713
errno = e;
795
714
goto mandos_end;
796
715
}
813
732
}
814
733
815
734
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
736
}
818
737
819
738
if(quit_now){
821
740
goto mandos_end;
822
741
}
823
742
824
/* Spurious warning from -Wint-to-pointer-cast */
825
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
744
827
745
if(quit_now){
839
757
840
758
if(ret != GNUTLS_E_SUCCESS){
841
759
if(debug){
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
843
761
gnutls_perror(ret);
844
762
}
845
763
errno = EPROTO;
849
767
/* Read OpenPGP packet that contains the wanted password */
850
768
851
769
if(debug){
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
771
ip);
854
772
}
855
773
856
774
while(true){
861
779
}
862
780
863
781
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
782
buffer_capacity);
865
783
if(buffer_capacity == 0){
866
784
int e = errno;
867
perror_plus("incbuffer");
785
perror("incbuffer");
868
786
errno = e;
869
787
goto mandos_end;
870
788
}
894
812
}
895
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
814
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
816
gnutls_perror(ret);
900
817
errno = EPROTO;
901
818
goto mandos_end;
902
819
}
903
820
break;
904
821
default:
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
822
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
907
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
825
errno = EIO;
909
826
goto mandos_end;
914
831
}
915
832
916
833
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
834
fprintf(stderr, "Closing TLS session\n");
918
835
}
919
836
920
837
if(quit_now){
932
849
933
850
if(buffer_length > 0){
934
851
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
buffer_length,
936
854
&decrypted_buffer);
937
855
if(decrypted_buffer_size >= 0){
938
856
949
867
if(ret == 0 and ferror(stdout)){
950
868
int e = errno;
951
869
if(debug){
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
870
fprintf(stderr, "Error writing encrypted data: %s\n",
871
strerror(errno));
954
872
}
955
873
errno = e;
956
874
goto mandos_end;
975
893
if(e == 0){
976
894
e = errno;
977
895
}
978
perror_plus("close");
896
perror("close");
979
897
}
980
898
gnutls_deinit(session);
981
errno = e;
982
899
if(quit_now){
983
errno = EINTR;
900
e = EINTR;
984
901
retval = -1;
985
902
}
903
errno = e;
986
904
}
987
905
return retval;
988
906
}
1013
931
switch(event){
1014
932
default:
1015
933
case AVAHI_RESOLVER_FAILURE:
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(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)));
1020
937
break;
1021
938
1022
939
case AVAHI_RESOLVER_FOUND:
1024
941
char ip[AVAHI_ADDRESS_STR_MAX];
1025
942
avahi_address_snprint(ip, sizeof(ip), address);
1026
943
if(debug){
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
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);
1030
947
}
1031
948
int ret = start_mandos_communication(ip, port, interface,
1032
949
avahi_proto_to_af(proto));
1033
950
if(ret == 0){
1034
951
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
1041
952
}
1042
953
}
1043
954
}
1067
978
default:
1068
979
case AVAHI_BROWSER_FAILURE:
1069
980
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
1072
983
avahi_simple_poll_quit(mc.simple_poll);
1073
984
return;
1074
985
1081
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
993
name, type, domain, protocol, 0,
1083
994
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
997
break;
1088
998
1089
999
case AVAHI_BROWSER_REMOVE:
1092
1002
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
1003
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
1004
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1097
1006
}
1098
1007
break;
1099
1008
}
1100
1009
}
1101
1010
1102
/* Signal handler that stops main loop after SIGTERM */
1011
/* stop main loop after sigterm has been called */
1103
1012
static void handle_sigterm(int sig){
1104
1013
if(quit_now){
1105
1014
return;
1107
1016
quit_now = 1;
1108
1017
signal_received = sig;
1109
1018
int old_errno = errno;
1110
/* set main loop to exit */
1111
1019
if(mc.simple_poll != NULL){
1112
1020
avahi_simple_poll_quit(mc.simple_poll);
1113
1021
}
1114
1022
errno = old_errno;
1115
1023
}
1116
1024
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
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
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
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){
1128
1079
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1130
1082
}
1131
return false;
1083
free(flagstring);
1084
return 0;
1132
1085
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1138
1088
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1089
if(flags & IFF_LOOPBACK){
1140
1090
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1143
1093
}
1144
return false;
1094
return 0;
1145
1095
}
1146
1096
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1148
1098
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1151
1101
}
1152
return true;
1102
return 1;
1153
1103
}
1154
1104
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
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
}
1171
1112
/* Accept this device */
1172
1113
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1524
1118
}
1525
1119
1526
1120
int main(int argc, char *argv[]){
1545
1139
bool gnutls_initialized = false;
1546
1140
bool gpgme_initialized = false;
1547
1141
float delay = 2.5f;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1550
1142
1551
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1552
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1558
1150
errno = 0;
1559
1151
ret = setgid(gid);
1560
1152
if(ret == -1){
1561
perror_plus("setgid");
1153
perror("setgid");
1562
1154
}
1563
1155
1564
1156
/* Lower user privileges (temporarily) */
1565
1157
errno = 0;
1566
1158
ret = seteuid(uid);
1567
1159
if(ret == -1){
1568
perror_plus("seteuid");
1160
perror("seteuid");
1569
1161
}
1570
1162
1571
1163
if(quit_now){
1606
1198
.arg = "SECONDS",
1607
1199
.doc = "Maximum delay to wait for interface startup",
1608
1200
.group = 2 },
1609
{ .name = "retry", .key = 132,
1610
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1616
.group = 2 },
1617
1201
/*
1618
1202
* These reproduce what we would get without ARGP_NO_HELP
1619
1203
*/
1663
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1664
1248
argp_error(state, "Bad delay");
1665
1249
}
1666
case 132: /* --retry */
1667
errno = 0;
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1673
}
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
1250
break;
1678
1251
/*
1679
1252
* These reproduce what we would get without ARGP_NO_HELP
1686
1259
argp_state_help(state, state->out_stream,
1687
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
1261
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1690
1263
exit(argp_err_exit_status);
1691
1264
break;
1692
1265
default:
1707
1280
case ENOMEM:
1708
1281
default:
1709
1282
errno = ret;
1710
perror_plus("argp_parse");
1283
perror("argp_parse");
1711
1284
exitcode = EX_OSERR;
1712
1285
goto end;
1713
1286
case EINVAL:
1715
1288
goto end;
1716
1289
}
1717
1290
}
1718
1719
{
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1722
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1785
}
1786
1291
1787
1292
if(not debug){
1788
1293
avahi_set_log_function(empty_log);
1789
1294
}
1790
1295
1791
1296
if(interface[0] == '\0'){
1792
1297
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1795
1299
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
1300
if(ret >= 1){
1803
/* Pick the first interface returned */
1301
/* Pick the first good interface */
1804
1302
interface = strdup(direntries[0]->d_name);
1805
1303
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1807
1305
}
1808
1306
if(interface == NULL){
1809
perror_plus("malloc");
1307
perror("malloc");
1810
1308
free(direntries);
1811
1309
exitcode = EXIT_FAILURE;
1812
1310
goto end;
1814
1312
free(direntries);
1815
1313
} else {
1816
1314
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1315
fprintf(stderr, "Could not find a network interface\n");
1818
1316
exitcode = EXIT_FAILURE;
1819
1317
goto end;
1820
1318
}
1826
1324
srand((unsigned int) time(NULL));
1827
1325
mc.simple_poll = avahi_simple_poll_new();
1828
1326
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1831
1328
exitcode = EX_UNAVAILABLE;
1832
1329
goto end;
1833
1330
}
1835
1332
sigemptyset(&sigterm_action.sa_mask);
1836
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1837
1334
if(ret == -1){
1838
perror_plus("sigaddset");
1335
perror("sigaddset");
1839
1336
exitcode = EX_OSERR;
1840
1337
goto end;
1841
1338
}
1842
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1843
1340
if(ret == -1){
1844
perror_plus("sigaddset");
1341
perror("sigaddset");
1845
1342
exitcode = EX_OSERR;
1846
1343
goto end;
1847
1344
}
1848
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1849
1346
if(ret == -1){
1850
perror_plus("sigaddset");
1347
perror("sigaddset");
1851
1348
exitcode = EX_OSERR;
1852
1349
goto end;
1853
1350
}
1857
1354
*/
1858
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1859
1356
if(ret == -1){
1860
perror_plus("sigaction");
1357
perror("sigaction");
1861
1358
return EX_OSERR;
1862
1359
}
1863
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1865
1362
if(ret == -1){
1866
perror_plus("sigaction");
1363
perror("sigaction");
1867
1364
exitcode = EX_OSERR;
1868
1365
goto end;
1869
1366
}
1870
1367
}
1871
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1872
1369
if(ret == -1){
1873
perror_plus("sigaction");
1370
perror("sigaction");
1874
1371
return EX_OSERR;
1875
1372
}
1876
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1878
1375
if(ret == -1){
1879
perror_plus("sigaction");
1376
perror("sigaction");
1880
1377
exitcode = EX_OSERR;
1881
1378
goto end;
1882
1379
}
1883
1380
}
1884
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1885
1382
if(ret == -1){
1886
perror_plus("sigaction");
1383
perror("sigaction");
1887
1384
return EX_OSERR;
1888
1385
}
1889
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1890
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1891
1388
if(ret == -1){
1892
perror_plus("sigaction");
1389
perror("sigaction");
1893
1390
exitcode = EX_OSERR;
1894
1391
goto end;
1895
1392
}
1899
1396
if(strcmp(interface, "none") != 0){
1900
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
1398
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1903
1400
exitcode = EX_UNAVAILABLE;
1904
1401
goto end;
1905
1402
}
1912
1409
errno = 0;
1913
1410
ret = seteuid(0);
1914
1411
if(ret == -1){
1915
perror_plus("seteuid");
1412
perror("seteuid");
1916
1413
}
1917
1414
1918
1415
#ifdef __linux__
1922
1419
bool restore_loglevel = true;
1923
1420
if(ret == -1){
1924
1421
restore_loglevel = false;
1925
perror_plus("klogctl");
1422
perror("klogctl");
1926
1423
}
1927
1424
#endif /* __linux__ */
1928
1425
1929
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
1427
if(sd < 0){
1931
perror_plus("socket");
1428
perror("socket");
1932
1429
exitcode = EX_OSERR;
1933
1430
#ifdef __linux__
1934
1431
if(restore_loglevel){
1935
1432
ret = klogctl(7, NULL, 0);
1936
1433
if(ret == -1){
1937
perror_plus("klogctl");
1434
perror("klogctl");
1938
1435
}
1939
1436
}
1940
1437
#endif /* __linux__ */
1942
1439
errno = 0;
1943
1440
ret = seteuid(uid);
1944
1441
if(ret == -1){
1945
perror_plus("seteuid");
1442
perror("seteuid");
1946
1443
}
1947
1444
goto end;
1948
1445
}
1949
1446
strcpy(network.ifr_name, interface);
1950
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
1448
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1449
perror("ioctl SIOCGIFFLAGS");
1953
1450
#ifdef __linux__
1954
1451
if(restore_loglevel){
1955
1452
ret = klogctl(7, NULL, 0);
1956
1453
if(ret == -1){
1957
perror_plus("klogctl");
1454
perror("klogctl");
1958
1455
}
1959
1456
}
1960
1457
#endif /* __linux__ */
1963
1460
errno = 0;
1964
1461
ret = seteuid(uid);
1965
1462
if(ret == -1){
1966
perror_plus("seteuid");
1463
perror("seteuid");
1967
1464
}
1968
1465
goto end;
1969
1466
}
1973
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
1471
if(ret == -1){
1975
1472
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1977
1474
exitcode = EX_OSERR;
1978
1475
#ifdef __linux__
1979
1476
if(restore_loglevel){
1980
1477
ret = klogctl(7, NULL, 0);
1981
1478
if(ret == -1){
1982
perror_plus("klogctl");
1479
perror("klogctl");
1983
1480
}
1984
1481
}
1985
1482
#endif /* __linux__ */
1987
1484
errno = 0;
1988
1485
ret = seteuid(uid);
1989
1486
if(ret == -1){
1990
perror_plus("seteuid");
1487
perror("seteuid");
1991
1488
}
1992
1489
goto end;
1993
1490
}
1994
1491
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1492
/* sleep checking until interface is running */
1997
1493
for(int i=0; i < delay * 4; i++){
1998
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
1495
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
1496
perror("ioctl SIOCGIFFLAGS");
2001
1497
} else if(network.ifr_flags & IFF_RUNNING){
2002
1498
break;
2003
1499
}
2004
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
1501
ret = nanosleep(&sleeptime, NULL);
2006
1502
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
1503
perror("nanosleep");
2008
1504
}
2009
1505
}
2010
1506
if(not take_down_interface){
2011
1507
/* We won't need the socket anymore */
2012
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
1509
if(ret == -1){
2014
perror_plus("close");
1510
perror("close");
2015
1511
}
2016
1512
}
2017
1513
#ifdef __linux__
2019
1515
/* Restores kernel loglevel to default */
2020
1516
ret = klogctl(7, NULL, 0);
2021
1517
if(ret == -1){
2022
perror_plus("klogctl");
1518
perror("klogctl");
2023
1519
}
2024
1520
}
2025
1521
#endif /* __linux__ */
2026
1522
/* Lower privileges */
2027
1523
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
2032
1536
}
2033
1537
}
2034
1538
2038
1542
2039
1543
ret = init_gnutls_global(pubkey, seckey);
2040
1544
if(ret == -1){
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
1545
fprintf(stderr, "init_gnutls_global failed\n");
2042
1546
exitcode = EX_UNAVAILABLE;
2043
1547
goto end;
2044
1548
} else {
2049
1553
goto end;
2050
1554
}
2051
1555
1556
tempdir_created = true;
2052
1557
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
1558
tempdir_created = false;
1559
perror("mkdtemp");
2054
1560
goto end;
2055
1561
}
2056
tempdir_created = true;
2057
1562
2058
1563
if(quit_now){
2059
1564
goto end;
2060
1565
}
2061
1566
2062
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "init_gpgme failed\n");
1568
fprintf(stderr, "init_gpgme failed\n");
2064
1569
exitcode = EX_UNAVAILABLE;
2065
1570
goto end;
2066
1571
} else {
2076
1581
/* (Mainly meant for debugging) */
2077
1582
char *address = strrchr(connect_to, ':');
2078
1583
if(address == NULL){
2079
fprintf_plus(stderr, "No colon in address\n");
1584
fprintf(stderr, "No colon in address\n");
2080
1585
exitcode = EX_USAGE;
2081
1586
goto end;
2082
1587
}
2090
1595
tmpmax = strtoimax(address+1, &tmp, 10);
2091
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
1597
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
1598
fprintf(stderr, "Bad port number\n");
2094
1599
exitcode = EX_USAGE;
2095
1600
goto end;
2096
1601
}
2101
1606
2102
1607
port = (uint16_t)tmpmax;
2103
1608
*address = '\0';
1609
address = connect_to;
2104
1610
/* Colon in address indicates IPv6 */
2105
1611
int af;
2106
if(strchr(connect_to, ':') != NULL){
1612
if(strchr(address, ':') != NULL){
2107
1613
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
2114
1614
} else {
2115
1615
af = AF_INET;
2116
1616
}
2117
address = connect_to;
2118
1617
2119
1618
if(quit_now){
2120
1619
goto end;
2121
1620
}
2122
1621
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2126
break;
2127
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
2135
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 {
2136
1644
exitcode = EXIT_SUCCESS;
2137
1645
}
2138
2139
1646
goto end;
2140
1647
}
2141
1648
2163
1670
2164
1671
/* Check if creating the Avahi server object succeeded */
2165
1672
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2168
1675
exitcode = EX_UNAVAILABLE;
2169
1676
goto end;
2170
1677
}
2178
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
1686
NULL, 0, browse_callback, NULL);
2180
1687
if(sb == NULL){
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
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)));
2183
1690
exitcode = EX_UNAVAILABLE;
2184
1691
goto end;
2185
1692
}
2191
1698
/* Run the main loop */
2192
1699
2193
1700
if(debug){
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2199
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2202
}
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
2203
1705
2204
1706
end:
2205
1707
2206
1708
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2208
1710
}
2209
1711
2210
1712
/* Cleanup things */
2227
1729
gpgme_release(mc.ctx);
2228
1730
}
2229
1731
2230
/* Cleans up the circular linked list of Mandos servers the client
2231
has seen */
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2238
}
2239
}
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
2246
1735
errno = 0;
2247
1736
ret = seteuid(0);
2248
1737
if(ret == -1){
2249
perror_plus("seteuid");
1738
perror("seteuid");
2250
1739
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
1740
if(geteuid() == 0){
2254
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
1742
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
2258
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
1747
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2262
1749
}
2263
1750
}
2264
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
1752
if(ret == -1){
2266
perror_plus("close");
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
2267
1760
}
2268
1761
}
2269
1762
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
1763
2277
/* Removes the GPGME temp directory and all files inside */
1764
/* Removes the temp directory used by GPGME */
2278
1765
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
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
}
2286
1786
char *fullname = NULL;
2287
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
1788
direntry->d_name);
2289
1789
if(ret < 0){
2290
perror_plus("asprintf");
1790
perror("asprintf");
2291
1791
continue;
2292
1792
}
2293
1793
ret = remove(fullname);
2294
1794
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
2297
1797
}
2298
1798
free(fullname);
2299
1799
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
1800
closedir(d);
2306
1801
}
2307
1802
ret = rmdir(tempdir);
2308
1803
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
1804
perror("rmdir");
2310
1805
}
2311
1806
}
2312
1807
2317
1812
&old_sigterm_action,
2318
1813
NULL));
2319
1814
if(ret == -1){
2320
perror_plus("sigaction");
1815
perror("sigaction");
2321
1816
}
2322
1817
do {
2323
1818
ret = raise(signal_received);
2324
1819
} while(ret != 0 and errno == EINTR);
2325
1820
if(ret != 0){
2326
perror_plus("raise");
1821
perror("raise");
2327
1822
abort();
2328
1823
}
2329
1824
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0