(root)/mandos/release
» Revision
24.1.165
(compared to revision 237.7.143)
: plugins.d/mandos-client.c
To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 24.1.165
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.165
- Committer: Björn Påhlsson
- Date: 2010-09-13 18:22:25 UTC
- mfrom: (237.2.192 mandos-local)
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 272.
- Revision ID: belorn@fukt.bsnet.se-20100913182225-vj9osnmstlefo1or
merge
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
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
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 */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
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
}
771
692
if(ret < 0){
772
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
694
int e = errno;
774
perror_plus("connect");
695
perror("connect");
775
696
errno = e;
776
697
}
777
698
goto mandos_end;
787
708
while(true){
788
709
size_t out_size = strlen(out);
789
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
711
out_size - written));
791
712
if(ret == -1){
792
713
int e = errno;
793
perror_plus("write");
714
perror("write");
794
715
errno = e;
795
716
goto mandos_end;
796
717
}
813
734
}
814
735
815
736
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
817
738
}
818
739
819
740
if(quit_now){
821
742
goto mandos_end;
822
743
}
823
744
824
/* This casting via intptr_t is to eliminate warning about casting
825
an int to a pointer type. This is exactly how the GnuTLS Guile
826
function "set-session-transport-fd!" does it. */
827
gnutls_transport_set_ptr(session,
828
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
829
746
830
747
if(quit_now){
831
748
errno = EINTR;
842
759
843
760
if(ret != GNUTLS_E_SUCCESS){
844
761
if(debug){
845
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
763
gnutls_perror(ret);
847
764
}
848
765
errno = EPROTO;
852
769
/* Read OpenPGP packet that contains the wanted password */
853
770
854
771
if(debug){
855
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
856
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
857
774
}
858
775
859
776
while(true){
864
781
}
865
782
866
783
buffer_capacity = incbuffer(&buffer, buffer_length,
867
buffer_capacity);
784
buffer_capacity);
868
785
if(buffer_capacity == 0){
869
786
int e = errno;
870
perror_plus("incbuffer");
787
perror("incbuffer");
871
788
errno = e;
872
789
goto mandos_end;
873
790
}
897
814
}
898
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
899
816
if(ret < 0){
900
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
901
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
818
gnutls_perror(ret);
903
819
errno = EPROTO;
904
820
goto mandos_end;
905
821
}
906
822
break;
907
823
default:
908
fprintf_plus(stderr, "Unknown error while reading data from"
909
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
910
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
911
827
errno = EIO;
912
828
goto mandos_end;
917
833
}
918
834
919
835
if(debug){
920
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
921
837
}
922
838
923
839
if(quit_now){
935
851
936
852
if(buffer_length > 0){
937
853
ssize_t decrypted_buffer_size;
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
939
856
&decrypted_buffer);
940
857
if(decrypted_buffer_size >= 0){
941
858
952
869
if(ret == 0 and ferror(stdout)){
953
870
int e = errno;
954
871
if(debug){
955
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
956
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
957
874
}
958
875
errno = e;
959
876
goto mandos_end;
978
895
if(e == 0){
979
896
e = errno;
980
897
}
981
perror_plus("close");
898
perror("close");
982
899
}
983
900
gnutls_deinit(session);
984
errno = e;
985
901
if(quit_now){
986
errno = EINTR;
902
e = EINTR;
987
903
retval = -1;
988
904
}
905
errno = e;
989
906
}
990
907
return retval;
991
908
}
1016
933
switch(event){
1017
934
default:
1018
935
case AVAHI_RESOLVER_FAILURE:
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1023
939
break;
1024
940
1025
941
case AVAHI_RESOLVER_FOUND:
1027
943
char ip[AVAHI_ADDRESS_STR_MAX];
1028
944
avahi_address_snprint(ip, sizeof(ip), address);
1029
945
if(debug){
1030
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1033
949
}
1034
950
int ret = start_mandos_communication(ip, port, interface,
1035
951
avahi_proto_to_af(proto));
1036
952
if(ret == 0){
1037
953
avahi_simple_poll_quit(mc.simple_poll);
1038
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
" list\n", name);
1043
}
1044
954
}
1045
955
}
1046
956
}
1070
980
default:
1071
981
case AVAHI_BROWSER_FAILURE:
1072
982
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1075
985
avahi_simple_poll_quit(mc.simple_poll);
1076
986
return;
1077
987
1084
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
995
name, type, domain, protocol, 0,
1086
996
resolve_callback, NULL) == NULL)
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1090
999
break;
1091
1000
1092
1001
case AVAHI_BROWSER_REMOVE:
1095
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1096
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1097
1006
if(debug){
1098
fprintf_plus(stderr, "No Mandos server found, still"
1099
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
1008
}
1101
1009
break;
1102
1010
}
1103
1011
}
1104
1012
1105
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1106
1014
static void handle_sigterm(int sig){
1107
1015
if(quit_now){
1108
1016
return;
1110
1018
quit_now = 1;
1111
1019
signal_received = sig;
1112
1020
int old_errno = errno;
1113
/* set main loop to exit */
1114
1021
if(mc.simple_poll != NULL){
1115
1022
avahi_simple_poll_quit(mc.simple_poll);
1116
1023
}
1117
1024
errno = old_errno;
1118
1025
}
1119
1026
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
int ret;
1122
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
if(s < 0){
1125
perror_plus("socket");
1126
return false;
1127
}
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
if(ret == -1){
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1131
1081
if(debug){
1132
perror_plus("ioctl SIOCGIFFLAGS");
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1133
1084
}
1134
return false;
1085
free(flagstring);
1086
return 0;
1135
1087
}
1136
return true;
1137
}
1138
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1141
1090
/* Reject the loopback device */
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1091
if(flags & IFF_LOOPBACK){
1143
1092
if(debug){
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1145
ifname);
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1146
1095
}
1147
return false;
1096
return 0;
1148
1097
}
1149
1098
/* Accept point-to-point devices only if connect_to is specified */
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1151
1100
if(debug){
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1154
1103
}
1155
return true;
1104
return 1;
1156
1105
}
1157
1106
/* Otherwise, reject non-broadcast-capable devices */
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1159
if(debug){
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1166
if(ifr->ifr_flags & IFF_NOARP){
1167
if(debug){
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
ifname);
1170
}
1171
return false;
1172
}
1173
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1174
1114
/* Accept this device */
1175
1115
if(debug){
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
}
1178
return true;
1179
}
1180
1181
/*
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1185
*/
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
1191
struct ifreq ifr;
1192
if(not get_flags(if_entry->d_name, &ifr)){
1193
if(debug){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1196
}
1197
return 0;
1198
}
1199
1200
if(not good_flags(if_entry->d_name, &ifr)){
1201
return 0;
1202
}
1203
return 1;
1204
}
1205
1206
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
bool run_network_hooks(const char *mode, const char *interface,
1394
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1400
if(numhooks == -1){
1401
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1409
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1478
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1527
1120
}
1528
1121
1529
1122
int main(int argc, char *argv[]){
1548
1141
bool gnutls_initialized = false;
1549
1142
bool gpgme_initialized = false;
1550
1143
float delay = 2.5f;
1551
double retry_interval = 10; /* 10s between trying a server and
1552
retrying the same server again */
1553
1144
1554
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1555
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1561
1152
errno = 0;
1562
1153
ret = setgid(gid);
1563
1154
if(ret == -1){
1564
perror_plus("setgid");
1155
perror("setgid");
1565
1156
}
1566
1157
1567
1158
/* Lower user privileges (temporarily) */
1568
1159
errno = 0;
1569
1160
ret = seteuid(uid);
1570
1161
if(ret == -1){
1571
perror_plus("seteuid");
1162
perror("seteuid");
1572
1163
}
1573
1164
1574
1165
if(quit_now){
1609
1200
.arg = "SECONDS",
1610
1201
.doc = "Maximum delay to wait for interface startup",
1611
1202
.group = 2 },
1612
{ .name = "retry", .key = 132,
1613
.arg = "SECONDS",
1614
.doc = "Retry interval used when denied by the Mandos server",
1615
.group = 2 },
1616
{ .name = "network-hook-dir", .key = 133,
1617
.arg = "DIR",
1618
.doc = "Directory where network hooks are located",
1619
.group = 2 },
1620
1203
/*
1621
1204
* These reproduce what we would get without ARGP_NO_HELP
1622
1205
*/
1666
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1667
1250
argp_error(state, "Bad delay");
1668
1251
}
1669
case 132: /* --retry */
1670
errno = 0;
1671
retry_interval = strtod(arg, &tmp);
1672
if(errno != 0 or tmp == arg or *tmp != '\0'
1673
or (retry_interval * 1000) > INT_MAX
1674
or retry_interval < 0){
1675
argp_error(state, "Bad retry interval");
1676
}
1677
break;
1678
case 133: /* --network-hook-dir */
1679
hookdir = arg;
1680
1252
break;
1681
1253
/*
1682
1254
* These reproduce what we would get without ARGP_NO_HELP
1689
1261
argp_state_help(state, state->out_stream,
1690
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1691
1263
case 'V': /* --version */
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1693
1265
exit(argp_err_exit_status);
1694
1266
break;
1695
1267
default:
1710
1282
case ENOMEM:
1711
1283
default:
1712
1284
errno = ret;
1713
perror_plus("argp_parse");
1285
perror("argp_parse");
1714
1286
exitcode = EX_OSERR;
1715
1287
goto end;
1716
1288
case EINVAL:
1718
1290
goto end;
1719
1291
}
1720
1292
}
1721
1722
{
1723
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
1725
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1732
struct stat st;
1733
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1738
} else {
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1740
if(ret == -1){
1741
perror_plus("fstat");
1742
} else {
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1746
if(ret == -1){
1747
perror_plus("fchown");
1748
}
1749
}
1750
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
}
1753
}
1754
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1759
} else {
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1761
if(ret == -1){
1762
perror_plus("fstat");
1763
} else {
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1767
if(ret == -1){
1768
perror_plus("fchown");
1769
}
1770
}
1771
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
1776
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
1781
}
1782
}
1783
}
1784
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
1788
}
1789
1293
1790
1294
if(not debug){
1791
1295
avahi_set_log_function(empty_log);
1792
1296
}
1793
1297
1794
1298
if(interface[0] == '\0'){
1795
1299
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1798
1301
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
1302
if(ret >= 1){
1806
/* Pick the first interface returned */
1303
/* Pick the first good interface */
1807
1304
interface = strdup(direntries[0]->d_name);
1808
1305
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1810
1307
}
1811
1308
if(interface == NULL){
1812
perror_plus("malloc");
1309
perror("malloc");
1813
1310
free(direntries);
1814
1311
exitcode = EXIT_FAILURE;
1815
1312
goto end;
1817
1314
free(direntries);
1818
1315
} else {
1819
1316
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1317
fprintf(stderr, "Could not find a network interface\n");
1821
1318
exitcode = EXIT_FAILURE;
1822
1319
goto end;
1823
1320
}
1829
1326
srand((unsigned int) time(NULL));
1830
1327
mc.simple_poll = avahi_simple_poll_new();
1831
1328
if(mc.simple_poll == NULL){
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1834
1330
exitcode = EX_UNAVAILABLE;
1835
1331
goto end;
1836
1332
}
1838
1334
sigemptyset(&sigterm_action.sa_mask);
1839
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1840
1336
if(ret == -1){
1841
perror_plus("sigaddset");
1337
perror("sigaddset");
1842
1338
exitcode = EX_OSERR;
1843
1339
goto end;
1844
1340
}
1845
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1846
1342
if(ret == -1){
1847
perror_plus("sigaddset");
1343
perror("sigaddset");
1848
1344
exitcode = EX_OSERR;
1849
1345
goto end;
1850
1346
}
1851
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1852
1348
if(ret == -1){
1853
perror_plus("sigaddset");
1349
perror("sigaddset");
1854
1350
exitcode = EX_OSERR;
1855
1351
goto end;
1856
1352
}
1860
1356
*/
1861
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1862
1358
if(ret == -1){
1863
perror_plus("sigaction");
1359
perror("sigaction");
1864
1360
return EX_OSERR;
1865
1361
}
1866
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1867
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1868
1364
if(ret == -1){
1869
perror_plus("sigaction");
1365
perror("sigaction");
1870
1366
exitcode = EX_OSERR;
1871
1367
goto end;
1872
1368
}
1873
1369
}
1874
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1875
1371
if(ret == -1){
1876
perror_plus("sigaction");
1372
perror("sigaction");
1877
1373
return EX_OSERR;
1878
1374
}
1879
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1880
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1881
1377
if(ret == -1){
1882
perror_plus("sigaction");
1378
perror("sigaction");
1883
1379
exitcode = EX_OSERR;
1884
1380
goto end;
1885
1381
}
1886
1382
}
1887
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1888
1384
if(ret == -1){
1889
perror_plus("sigaction");
1385
perror("sigaction");
1890
1386
return EX_OSERR;
1891
1387
}
1892
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1893
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1894
1390
if(ret == -1){
1895
perror_plus("sigaction");
1391
perror("sigaction");
1896
1392
exitcode = EX_OSERR;
1897
1393
goto end;
1898
1394
}
1902
1398
if(strcmp(interface, "none") != 0){
1903
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
1400
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1906
1402
exitcode = EX_UNAVAILABLE;
1907
1403
goto end;
1908
1404
}
1915
1411
errno = 0;
1916
1412
ret = seteuid(0);
1917
1413
if(ret == -1){
1918
perror_plus("seteuid");
1414
perror("seteuid");
1919
1415
}
1920
1416
1921
1417
#ifdef __linux__
1925
1421
bool restore_loglevel = true;
1926
1422
if(ret == -1){
1927
1423
restore_loglevel = false;
1928
perror_plus("klogctl");
1424
perror("klogctl");
1929
1425
}
1930
1426
#endif /* __linux__ */
1931
1427
1932
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
1429
if(sd < 0){
1934
perror_plus("socket");
1430
perror("socket");
1935
1431
exitcode = EX_OSERR;
1936
1432
#ifdef __linux__
1937
1433
if(restore_loglevel){
1938
1434
ret = klogctl(7, NULL, 0);
1939
1435
if(ret == -1){
1940
perror_plus("klogctl");
1436
perror("klogctl");
1941
1437
}
1942
1438
}
1943
1439
#endif /* __linux__ */
1945
1441
errno = 0;
1946
1442
ret = seteuid(uid);
1947
1443
if(ret == -1){
1948
perror_plus("seteuid");
1444
perror("seteuid");
1949
1445
}
1950
1446
goto end;
1951
1447
}
1952
1448
strcpy(network.ifr_name, interface);
1953
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
1450
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1956
1452
#ifdef __linux__
1957
1453
if(restore_loglevel){
1958
1454
ret = klogctl(7, NULL, 0);
1959
1455
if(ret == -1){
1960
perror_plus("klogctl");
1456
perror("klogctl");
1961
1457
}
1962
1458
}
1963
1459
#endif /* __linux__ */
1966
1462
errno = 0;
1967
1463
ret = seteuid(uid);
1968
1464
if(ret == -1){
1969
perror_plus("seteuid");
1465
perror("seteuid");
1970
1466
}
1971
1467
goto end;
1972
1468
}
1976
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
1473
if(ret == -1){
1978
1474
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1980
1476
exitcode = EX_OSERR;
1981
1477
#ifdef __linux__
1982
1478
if(restore_loglevel){
1983
1479
ret = klogctl(7, NULL, 0);
1984
1480
if(ret == -1){
1985
perror_plus("klogctl");
1481
perror("klogctl");
1986
1482
}
1987
1483
}
1988
1484
#endif /* __linux__ */
1990
1486
errno = 0;
1991
1487
ret = seteuid(uid);
1992
1488
if(ret == -1){
1993
perror_plus("seteuid");
1489
perror("seteuid");
1994
1490
}
1995
1491
goto end;
1996
1492
}
1997
1493
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
2000
1495
for(int i=0; i < delay * 4; i++){
2001
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
1497
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
2004
1499
} else if(network.ifr_flags & IFF_RUNNING){
2005
1500
break;
2006
1501
}
2007
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
1503
ret = nanosleep(&sleeptime, NULL);
2009
1504
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
1505
perror("nanosleep");
2011
1506
}
2012
1507
}
2013
1508
if(not take_down_interface){
2014
1509
/* We won't need the socket anymore */
2015
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
1511
if(ret == -1){
2017
perror_plus("close");
1512
perror("close");
2018
1513
}
2019
1514
}
2020
1515
#ifdef __linux__
2022
1517
/* Restores kernel loglevel to default */
2023
1518
ret = klogctl(7, NULL, 0);
2024
1519
if(ret == -1){
2025
perror_plus("klogctl");
1520
perror("klogctl");
2026
1521
}
2027
1522
}
2028
1523
#endif /* __linux__ */
2029
1524
/* Lower privileges */
2030
1525
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
2035
1538
}
2036
1539
}
2037
1540
2041
1544
2042
1545
ret = init_gnutls_global(pubkey, seckey);
2043
1546
if(ret == -1){
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2045
1548
exitcode = EX_UNAVAILABLE;
2046
1549
goto end;
2047
1550
} else {
2052
1555
goto end;
2053
1556
}
2054
1557
1558
tempdir_created = true;
2055
1559
if(mkdtemp(tempdir) == NULL){
2056
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2057
1562
goto end;
2058
1563
}
2059
tempdir_created = true;
2060
1564
2061
1565
if(quit_now){
2062
1566
goto end;
2063
1567
}
2064
1568
2065
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2066
fprintf_plus(stderr, "init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2067
1571
exitcode = EX_UNAVAILABLE;
2068
1572
goto end;
2069
1573
} else {
2079
1583
/* (Mainly meant for debugging) */
2080
1584
char *address = strrchr(connect_to, ':');
2081
1585
if(address == NULL){
2082
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2083
1587
exitcode = EX_USAGE;
2084
1588
goto end;
2085
1589
}
2093
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2094
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
1599
or tmpmax != (uint16_t)tmpmax){
2096
fprintf_plus(stderr, "Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2097
1601
exitcode = EX_USAGE;
2098
1602
goto end;
2099
1603
}
2104
1608
2105
1609
port = (uint16_t)tmpmax;
2106
1610
*address = '\0';
1611
address = connect_to;
2107
1612
/* Colon in address indicates IPv6 */
2108
1613
int af;
2109
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2110
1615
af = AF_INET6;
2111
/* Accept [] around IPv6 address - see RFC 5952 */
2112
if(connect_to[0] == '[' and address[-1] == ']')
2113
{
2114
connect_to++;
2115
address[-1] = '\0';
2116
}
2117
1616
} else {
2118
1617
af = AF_INET;
2119
1618
}
2120
address = connect_to;
2121
1619
2122
1620
if(quit_now){
2123
1621
goto end;
2124
1622
}
2125
1623
2126
1624
while(not quit_now){
2127
1625
ret = start_mandos_communication(address, port, if_index, af);
2128
1626
if(quit_now or ret == 0){
2129
1627
break;
2130
1628
}
2131
if(debug){
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
2134
}
2135
sleep((int)retry_interval);
2136
}
2137
1629
sleep(15);
1630
};
1631
2138
1632
if (not quit_now){
2139
1633
exitcode = EXIT_SUCCESS;
2140
1634
}
2141
1635
2142
1636
goto end;
2143
1637
}
2144
1638
2166
1660
2167
1661
/* Check if creating the Avahi server object succeeded */
2168
1662
if(mc.server == NULL){
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2171
1665
exitcode = EX_UNAVAILABLE;
2172
1666
goto end;
2173
1667
}
2181
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
1676
NULL, 0, browse_callback, NULL);
2183
1677
if(sb == NULL){
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2186
1680
exitcode = EX_UNAVAILABLE;
2187
1681
goto end;
2188
1682
}
2194
1688
/* Run the main loop */
2195
1689
2196
1690
if(debug){
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2202
if(debug){
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
(ret == 0) ? "successfully" : "with error");
2205
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2206
1695
2207
1696
end:
2208
1697
2209
1698
if(debug){
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2211
1700
}
2212
1701
2213
1702
/* Cleanup things */
2230
1719
gpgme_release(mc.ctx);
2231
1720
}
2232
1721
2233
/* Cleans up the circular linked list of Mandos servers the client
2234
has seen */
2235
if(mc.current_server != NULL){
2236
mc.current_server->prev->next = NULL;
2237
while(mc.current_server != NULL){
2238
server *next = mc.current_server->next;
2239
free(mc.current_server);
2240
mc.current_server = next;
2241
}
2242
}
2243
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2248
{
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
2249
1725
errno = 0;
2250
1726
ret = seteuid(0);
2251
1727
if(ret == -1){
2252
perror_plus("seteuid");
1728
perror("seteuid");
2253
1729
}
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
1730
if(geteuid() == 0){
2257
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
1732
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2261
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
1737
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2265
1739
}
2266
1740
}
2267
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
1742
if(ret == -1){
2269
perror_plus("close");
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2270
1750
}
2271
1751
}
2272
1752
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2279
1753
2280
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2281
1755
if(tempdir_created){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2289
1776
char *fullname = NULL;
2290
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
1778
direntry->d_name);
2292
1779
if(ret < 0){
2293
perror_plus("asprintf");
1780
perror("asprintf");
2294
1781
continue;
2295
1782
}
2296
1783
ret = remove(fullname);
2297
1784
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2300
1787
}
2301
1788
free(fullname);
2302
1789
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
1790
closedir(d);
2309
1791
}
2310
1792
ret = rmdir(tempdir);
2311
1793
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
1794
perror("rmdir");
2313
1795
}
2314
1796
}
2315
1797
2320
1802
&old_sigterm_action,
2321
1803
NULL));
2322
1804
if(ret == -1){
2323
perror_plus("sigaction");
1805
perror("sigaction");
2324
1806
}
2325
1807
do {
2326
1808
ret = raise(signal_received);
2327
1809
} while(ret != 0 and errno == EINTR);
2328
1810
if(ret != 0){
2329
perror_plus("raise");
1811
perror("raise");
2330
1812
abort();
2331
1813
}
2332
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0