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 592
- compare with another revision
- download diff
- download tarball
- view history from revision 592
- Committer: Teddy Hogeborn
- Date: 2012-05-27 07:30:49 UTC
- Revision ID: teddy@recompile.se-20120527073049-f153zv8otgosqonh
* plugins.d/mandos-client.xml (EXAMPLE): Doc fix: Network interface is
now automatically determined,
not always "eth0".
now automatically determined,
not always "eth0".
- files added:
- 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 © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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 */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
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 */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
87
91
88
92
#ifdef __linux__
89
93
#include <sys/klog.h> /* klogctl() */
107
111
init_gnutls_session(),
108
112
GNUTLS_* */
109
113
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
112
116
113
117
/* GPGME */
114
118
#include <gpgme.h> /* All GPGME types, constants and
122
126
#define PATHDIR "/conf/conf.d/mandos"
123
127
#define SECKEY "seckey.txt"
124
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
130
126
131
bool debug = false;
127
132
static const char mandos_protocol_version[] = "1";
128
133
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
135
static const char sys_class_net[] = "/sys/class/net";
131
136
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;
132
149
133
150
/* Used for passing in values through the Avahi callback functions */
134
151
typedef struct {
139
156
gnutls_dh_params_t dh_params;
140
157
const char *priority;
141
158
gpgme_ctx_t ctx;
159
server *current_server;
142
160
} mandos_context;
143
161
144
162
/* global context so signal handler can reach it*/
145
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
164
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
148
167
149
168
sig_atomic_t quit_now = 0;
150
169
int signal_received = 0;
151
170
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
152
190
/*
153
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
192
* bytes. "buffer_capacity" is how much is currently allocated,
155
193
* "buffer_length" is how much is already used.
156
194
*/
157
195
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
196
size_t buffer_capacity){
159
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
199
if(buffer == NULL){
166
204
return buffer_capacity;
167
205
}
168
206
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
169
244
/*
170
245
* Initialize GPGME.
171
246
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
174
249
gpgme_error_t rc;
175
250
gpgme_engine_info_t engine_info;
176
251
185
260
186
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
262
if(fd == -1){
188
perror("open");
263
perror_plus("open");
189
264
return false;
190
265
}
191
266
192
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
268
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
196
271
return false;
197
272
}
198
273
199
274
rc = gpgme_op_import(mc.ctx, pgp_data);
200
275
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
203
278
return false;
204
279
}
205
280
206
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
282
if(ret == -1){
208
perror("close");
283
perror_plus("close");
209
284
}
210
285
gpgme_data_release(pgp_data);
211
286
return true;
212
287
}
213
288
214
289
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
216
291
}
217
292
218
293
/* Init GPGME */
219
294
gpgme_check_version(NULL);
220
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
296
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
224
299
return false;
225
300
}
226
301
227
/* Set GPGME home directory for the OpenPGP engine only */
302
/* Set GPGME home directory for the OpenPGP engine only */
228
303
rc = gpgme_get_engine_info(&engine_info);
229
304
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
232
307
return false;
233
308
}
234
309
while(engine_info != NULL){
240
315
engine_info = engine_info->next;
241
316
}
242
317
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
244
320
return false;
245
321
}
246
322
247
323
/* Create new GPGME "context" */
248
324
rc = gpgme_new(&(mc.ctx));
249
325
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
252
329
return false;
253
330
}
254
331
273
350
ssize_t plaintext_length = 0;
274
351
275
352
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
354
}
278
355
279
356
/* Create new GPGME data buffer from memory cryptotext */
280
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
358
0);
282
359
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
285
362
return -1;
286
363
}
287
364
288
365
/* Create new empty GPGME data buffer for the plaintext */
289
366
rc = gpgme_data_new(&dh_plain);
290
367
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
293
371
gpgme_data_release(dh_crypto);
294
372
return -1;
295
373
}
298
376
data buffer */
299
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
378
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
303
381
plaintext_length = -1;
304
382
if(debug){
305
383
gpgme_decrypt_result_t result;
306
384
result = gpgme_op_decrypt_result(mc.ctx);
307
385
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
387
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
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);
314
392
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
394
}
317
395
gpgme_recipient_t recipient;
318
396
recipient = result->recipients;
319
397
while(recipient != NULL){
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");
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");
326
405
recipient = recipient->next;
327
406
}
328
407
}
331
410
}
332
411
333
412
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
414
}
336
415
337
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
418
perror_plus("gpgme_data_seek");
340
419
plaintext_length = -1;
341
420
goto decrypt_end;
342
421
}
344
423
*plaintext = NULL;
345
424
while(true){
346
425
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
349
428
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
353
432
}
354
433
355
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
439
break;
361
440
}
362
441
if(ret < 0){
363
perror("gpgme_data_read");
442
perror_plus("gpgme_data_read");
364
443
plaintext_length = -1;
365
444
goto decrypt_end;
366
445
}
368
447
}
369
448
370
449
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
372
451
for(ssize_t i = 0; i < plaintext_length; i++){
373
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
453
}
396
475
/* GnuTLS log function callback */
397
476
static void debuggnutls(__attribute__((unused)) int level,
398
477
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
400
479
}
401
480
402
481
static int init_gnutls_global(const char *pubkeyfilename,
404
483
int ret;
405
484
406
485
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
487
}
409
488
410
489
ret = gnutls_global_init();
411
490
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
414
493
return -1;
415
494
}
416
495
423
502
}
424
503
425
504
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
506
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
433
509
gnutls_global_deinit();
434
510
return -1;
435
511
}
436
512
437
513
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
441
518
}
442
519
443
520
ret = gnutls_certificate_set_openpgp_key_file
444
521
(mc.cred, pubkeyfilename, seckeyfilename,
445
522
GNUTLS_OPENPGP_FMT_BASE64);
446
523
if(ret != GNUTLS_E_SUCCESS){
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));
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));
452
529
goto globalfail;
453
530
}
454
531
455
532
/* GnuTLS server initialization */
456
533
ret = gnutls_dh_params_init(&mc.dh_params);
457
534
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
460
538
goto globalfail;
461
539
}
462
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
541
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
466
544
goto globalfail;
467
545
}
468
546
488
566
}
489
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
568
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
493
572
}
494
573
495
574
{
502
581
}
503
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
583
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
508
587
gnutls_deinit(*session);
509
588
return -1;
510
589
}
519
598
}
520
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
600
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
524
603
gnutls_deinit(*session);
525
604
return -1;
526
605
}
571
650
pf = PF_INET;
572
651
break;
573
652
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
654
errno = EINVAL;
576
655
return -1;
577
656
}
582
661
}
583
662
584
663
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
587
666
}
588
667
589
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
669
if(tcp_sd < 0){
591
670
int e = errno;
592
perror("socket");
671
perror_plus("socket");
593
672
errno = e;
594
673
goto mandos_end;
595
674
}
609
688
}
610
689
if(ret < 0 ){
611
690
int e = errno;
612
perror("inet_pton");
691
perror_plus("inet_pton");
613
692
errno = e;
614
693
goto mandos_end;
615
694
}
616
695
if(ret == 0){
617
696
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
698
errno = e;
620
699
goto mandos_end;
621
700
}
626
705
627
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
708
-Wunreachable-code*/
630
709
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
633
712
errno = EINVAL;
634
713
goto mandos_end;
635
714
}
651
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
731
char interface[IF_NAMESIZE];
653
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
733
perror_plus("if_indextoname");
655
734
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
658
737
}
659
738
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
662
741
}
663
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
750
sizeof(addrstr));
672
751
}
673
752
if(pcret == NULL){
674
perror("inet_ntop");
753
perror_plus("inet_ntop");
675
754
} else {
676
755
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
757
}
679
758
}
680
759
}
692
771
if(ret < 0){
693
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
773
int e = errno;
695
perror("connect");
774
perror_plus("connect");
696
775
errno = e;
697
776
}
698
777
goto mandos_end;
708
787
while(true){
709
788
size_t out_size = strlen(out);
710
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
790
out_size - written));
712
791
if(ret == -1){
713
792
int e = errno;
714
perror("write");
793
perror_plus("write");
715
794
errno = e;
716
795
goto mandos_end;
717
796
}
734
813
}
735
814
736
815
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
817
}
739
818
740
819
if(quit_now){
742
821
goto mandos_end;
743
822
}
744
823
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
746
829
747
830
if(quit_now){
748
831
errno = EINTR;
759
842
760
843
if(ret != GNUTLS_E_SUCCESS){
761
844
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
846
gnutls_perror(ret);
764
847
}
765
848
errno = EPROTO;
769
852
/* Read OpenPGP packet that contains the wanted password */
770
853
771
854
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
855
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
856
" %s\n", ip);
774
857
}
775
858
776
859
while(true){
781
864
}
782
865
783
866
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
867
buffer_capacity);
785
868
if(buffer_capacity == 0){
786
869
int e = errno;
787
perror("incbuffer");
870
perror_plus("incbuffer");
788
871
errno = e;
789
872
goto mandos_end;
790
873
}
814
897
}
815
898
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
899
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
900
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
901
"***\n");
818
902
gnutls_perror(ret);
819
903
errno = EPROTO;
820
904
goto mandos_end;
821
905
}
822
906
break;
823
907
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
908
fprintf_plus(stderr, "Unknown error while reading data from"
909
" encrypted session with Mandos server\n");
826
910
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
911
errno = EIO;
828
912
goto mandos_end;
833
917
}
834
918
835
919
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
920
fprintf_plus(stderr, "Closing TLS session\n");
837
921
}
838
922
839
923
if(quit_now){
851
935
852
936
if(buffer_length > 0){
853
937
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
856
939
&decrypted_buffer);
857
940
if(decrypted_buffer_size >= 0){
858
941
869
952
if(ret == 0 and ferror(stdout)){
870
953
int e = errno;
871
954
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
955
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
956
strerror(errno));
874
957
}
875
958
errno = e;
876
959
goto mandos_end;
895
978
if(e == 0){
896
979
e = errno;
897
980
}
898
perror("close");
981
perror_plus("close");
899
982
}
900
983
gnutls_deinit(session);
984
errno = e;
901
985
if(quit_now){
902
e = EINTR;
986
errno = EINTR;
903
987
retval = -1;
904
988
}
905
errno = e;
906
989
}
907
990
return retval;
908
991
}
933
1016
switch(event){
934
1017
default:
935
1018
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
939
1023
break;
940
1024
941
1025
case AVAHI_RESOLVER_FOUND:
943
1027
char ip[AVAHI_ADDRESS_STR_MAX];
944
1028
avahi_address_snprint(ip, sizeof(ip), address);
945
1029
if(debug){
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);
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);
949
1033
}
950
1034
int ret = start_mandos_communication(ip, port, interface,
951
1035
avahi_proto_to_af(proto));
952
1036
if(ret == 0){
953
1037
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
}
954
1044
}
955
1045
}
956
1046
}
980
1070
default:
981
1071
case AVAHI_BROWSER_FAILURE:
982
1072
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
985
1075
avahi_simple_poll_quit(mc.simple_poll);
986
1076
return;
987
1077
994
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
1085
name, type, domain, protocol, 0,
996
1086
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
999
1090
break;
1000
1091
1001
1092
case AVAHI_BROWSER_REMOVE:
1004
1095
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1096
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1097
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1098
fprintf_plus(stderr, "No Mandos server found, still"
1099
" searching...\n");
1008
1100
}
1009
1101
break;
1010
1102
}
1011
1103
}
1012
1104
1013
/* stop main loop after sigterm has been called */
1105
/* Signal handler that stops main loop after SIGTERM */
1014
1106
static void handle_sigterm(int sig){
1015
1107
if(quit_now){
1016
1108
return;
1018
1110
quit_now = 1;
1019
1111
signal_received = sig;
1020
1112
int old_errno = errno;
1113
/* set main loop to exit */
1021
1114
if(mc.simple_poll != NULL){
1022
1115
avahi_simple_poll_quit(mc.simple_poll);
1023
1116
}
1024
1117
errno = old_errno;
1025
1118
}
1026
1119
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){
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){
1081
1131
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1132
perror_plus("ioctl SIOCGIFFLAGS");
1084
1133
}
1085
free(flagstring);
1086
return 0;
1134
return false;
1087
1135
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1136
return true;
1137
}
1138
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1090
1141
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1092
1143
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1145
ifname);
1095
1146
}
1096
return 0;
1147
return false;
1097
1148
}
1098
1149
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1100
1151
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1103
1154
}
1104
return 1;
1155
return true;
1105
1156
}
1106
1157
/* Otherwise, reject non-broadcast-capable devices */
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
}
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
1114
1174
/* Accept this device */
1115
1175
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
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;
1120
1527
}
1121
1528
1122
1529
int main(int argc, char *argv[]){
1141
1548
bool gnutls_initialized = false;
1142
1549
bool gpgme_initialized = false;
1143
1550
float delay = 2.5f;
1551
double retry_interval = 10; /* 10s between trying a server and
1552
retrying the same server again */
1144
1553
1145
1554
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1555
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1561
errno = 0;
1153
1562
ret = setgid(gid);
1154
1563
if(ret == -1){
1155
perror("setgid");
1564
perror_plus("setgid");
1156
1565
}
1157
1566
1158
1567
/* Lower user privileges (temporarily) */
1159
1568
errno = 0;
1160
1569
ret = seteuid(uid);
1161
1570
if(ret == -1){
1162
perror("seteuid");
1571
perror_plus("seteuid");
1163
1572
}
1164
1573
1165
1574
if(quit_now){
1200
1609
.arg = "SECONDS",
1201
1610
.doc = "Maximum delay to wait for interface startup",
1202
1611
.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 },
1203
1620
/*
1204
1621
* These reproduce what we would get without ARGP_NO_HELP
1205
1622
*/
1249
1666
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1667
argp_error(state, "Bad delay");
1251
1668
}
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;
1252
1680
break;
1253
1681
/*
1254
1682
* These reproduce what we would get without ARGP_NO_HELP
1261
1689
argp_state_help(state, state->out_stream,
1262
1690
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
1691
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
1693
exit(argp_err_exit_status);
1266
1694
break;
1267
1695
default:
1282
1710
case ENOMEM:
1283
1711
default:
1284
1712
errno = ret;
1285
perror("argp_parse");
1713
perror_plus("argp_parse");
1286
1714
exitcode = EX_OSERR;
1287
1715
goto end;
1288
1716
case EINVAL:
1290
1718
goto end;
1291
1719
}
1292
1720
}
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
}
1293
1789
1294
1790
if(not debug){
1295
1791
avahi_set_log_function(empty_log);
1296
1792
}
1297
1793
1298
1794
if(interface[0] == '\0'){
1299
1795
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1301
1798
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
}
1302
1805
if(ret >= 1){
1303
/* Pick the first good interface */
1806
/* Pick the first interface returned */
1304
1807
interface = strdup(direntries[0]->d_name);
1305
1808
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1307
1810
}
1308
1811
if(interface == NULL){
1309
perror("malloc");
1812
perror_plus("malloc");
1310
1813
free(direntries);
1311
1814
exitcode = EXIT_FAILURE;
1312
1815
goto end;
1314
1817
free(direntries);
1315
1818
} else {
1316
1819
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1318
1821
exitcode = EXIT_FAILURE;
1319
1822
goto end;
1320
1823
}
1326
1829
srand((unsigned int) time(NULL));
1327
1830
mc.simple_poll = avahi_simple_poll_new();
1328
1831
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1330
1834
exitcode = EX_UNAVAILABLE;
1331
1835
goto end;
1332
1836
}
1334
1838
sigemptyset(&sigterm_action.sa_mask);
1335
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
1840
if(ret == -1){
1337
perror("sigaddset");
1841
perror_plus("sigaddset");
1338
1842
exitcode = EX_OSERR;
1339
1843
goto end;
1340
1844
}
1341
1845
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
1846
if(ret == -1){
1343
perror("sigaddset");
1847
perror_plus("sigaddset");
1344
1848
exitcode = EX_OSERR;
1345
1849
goto end;
1346
1850
}
1347
1851
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
1852
if(ret == -1){
1349
perror("sigaddset");
1853
perror_plus("sigaddset");
1350
1854
exitcode = EX_OSERR;
1351
1855
goto end;
1352
1856
}
1356
1860
*/
1357
1861
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
1862
if(ret == -1){
1359
perror("sigaction");
1863
perror_plus("sigaction");
1360
1864
return EX_OSERR;
1361
1865
}
1362
1866
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
1867
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
1868
if(ret == -1){
1365
perror("sigaction");
1869
perror_plus("sigaction");
1366
1870
exitcode = EX_OSERR;
1367
1871
goto end;
1368
1872
}
1369
1873
}
1370
1874
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
1875
if(ret == -1){
1372
perror("sigaction");
1876
perror_plus("sigaction");
1373
1877
return EX_OSERR;
1374
1878
}
1375
1879
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
1880
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
1881
if(ret == -1){
1378
perror("sigaction");
1882
perror_plus("sigaction");
1379
1883
exitcode = EX_OSERR;
1380
1884
goto end;
1381
1885
}
1382
1886
}
1383
1887
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
1888
if(ret == -1){
1385
perror("sigaction");
1889
perror_plus("sigaction");
1386
1890
return EX_OSERR;
1387
1891
}
1388
1892
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
1893
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
1894
if(ret == -1){
1391
perror("sigaction");
1895
perror_plus("sigaction");
1392
1896
exitcode = EX_OSERR;
1393
1897
goto end;
1394
1898
}
1398
1902
if(strcmp(interface, "none") != 0){
1399
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
1904
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1402
1906
exitcode = EX_UNAVAILABLE;
1403
1907
goto end;
1404
1908
}
1411
1915
errno = 0;
1412
1916
ret = seteuid(0);
1413
1917
if(ret == -1){
1414
perror("seteuid");
1918
perror_plus("seteuid");
1415
1919
}
1416
1920
1417
1921
#ifdef __linux__
1421
1925
bool restore_loglevel = true;
1422
1926
if(ret == -1){
1423
1927
restore_loglevel = false;
1424
perror("klogctl");
1928
perror_plus("klogctl");
1425
1929
}
1426
1930
#endif /* __linux__ */
1427
1931
1428
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1933
if(sd < 0){
1430
perror("socket");
1934
perror_plus("socket");
1431
1935
exitcode = EX_OSERR;
1432
1936
#ifdef __linux__
1433
1937
if(restore_loglevel){
1434
1938
ret = klogctl(7, NULL, 0);
1435
1939
if(ret == -1){
1436
perror("klogctl");
1940
perror_plus("klogctl");
1437
1941
}
1438
1942
}
1439
1943
#endif /* __linux__ */
1441
1945
errno = 0;
1442
1946
ret = seteuid(uid);
1443
1947
if(ret == -1){
1444
perror("seteuid");
1948
perror_plus("seteuid");
1445
1949
}
1446
1950
goto end;
1447
1951
}
1448
1952
strcpy(network.ifr_name, interface);
1449
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
1954
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1955
perror_plus("ioctl SIOCGIFFLAGS");
1452
1956
#ifdef __linux__
1453
1957
if(restore_loglevel){
1454
1958
ret = klogctl(7, NULL, 0);
1455
1959
if(ret == -1){
1456
perror("klogctl");
1960
perror_plus("klogctl");
1457
1961
}
1458
1962
}
1459
1963
#endif /* __linux__ */
1462
1966
errno = 0;
1463
1967
ret = seteuid(uid);
1464
1968
if(ret == -1){
1465
perror("seteuid");
1969
perror_plus("seteuid");
1466
1970
}
1467
1971
goto end;
1468
1972
}
1472
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1977
if(ret == -1){
1474
1978
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1476
1980
exitcode = EX_OSERR;
1477
1981
#ifdef __linux__
1478
1982
if(restore_loglevel){
1479
1983
ret = klogctl(7, NULL, 0);
1480
1984
if(ret == -1){
1481
perror("klogctl");
1985
perror_plus("klogctl");
1482
1986
}
1483
1987
}
1484
1988
#endif /* __linux__ */
1486
1990
errno = 0;
1487
1991
ret = seteuid(uid);
1488
1992
if(ret == -1){
1489
perror("seteuid");
1993
perror_plus("seteuid");
1490
1994
}
1491
1995
goto end;
1492
1996
}
1493
1997
}
1494
/* sleep checking until interface is running */
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1495
2000
for(int i=0; i < delay * 4; i++){
1496
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
2002
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
2003
perror_plus("ioctl SIOCGIFFLAGS");
1499
2004
} else if(network.ifr_flags & IFF_RUNNING){
1500
2005
break;
1501
2006
}
1502
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
2008
ret = nanosleep(&sleeptime, NULL);
1504
2009
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
2010
perror_plus("nanosleep");
1506
2011
}
1507
2012
}
1508
2013
if(not take_down_interface){
1509
2014
/* We won't need the socket anymore */
1510
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
2016
if(ret == -1){
1512
perror("close");
2017
perror_plus("close");
1513
2018
}
1514
2019
}
1515
2020
#ifdef __linux__
1517
2022
/* Restores kernel loglevel to default */
1518
2023
ret = klogctl(7, NULL, 0);
1519
2024
if(ret == -1){
1520
perror("klogctl");
2025
perror_plus("klogctl");
1521
2026
}
1522
2027
}
1523
2028
#endif /* __linux__ */
1524
2029
/* Lower privileges */
1525
2030
errno = 0;
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
}
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
1538
2035
}
1539
2036
}
1540
2037
1544
2041
1545
2042
ret = init_gnutls_global(pubkey, seckey);
1546
2043
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2045
exitcode = EX_UNAVAILABLE;
1549
2046
goto end;
1550
2047
} else {
1555
2052
goto end;
1556
2053
}
1557
2054
2055
if(mkdtemp(tempdir) == NULL){
2056
perror_plus("mkdtemp");
2057
goto end;
2058
}
1558
2059
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2060
1565
2061
if(quit_now){
1566
2062
goto end;
1567
2063
}
1568
2064
1569
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2066
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2067
exitcode = EX_UNAVAILABLE;
1572
2068
goto end;
1573
2069
} else {
1583
2079
/* (Mainly meant for debugging) */
1584
2080
char *address = strrchr(connect_to, ':');
1585
2081
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2082
fprintf_plus(stderr, "No colon in address\n");
1587
2083
exitcode = EX_USAGE;
1588
2084
goto end;
1589
2085
}
1597
2093
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
2095
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2096
fprintf_plus(stderr, "Bad port number\n");
1601
2097
exitcode = EX_USAGE;
1602
2098
goto end;
1603
2099
}
1608
2104
1609
2105
port = (uint16_t)tmpmax;
1610
2106
*address = '\0';
1611
address = connect_to;
1612
2107
/* Colon in address indicates IPv6 */
1613
2108
int af;
1614
if(strchr(address, ':') != NULL){
2109
if(strchr(connect_to, ':') != NULL){
1615
2110
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
}
1616
2117
} else {
1617
2118
af = AF_INET;
1618
2119
}
2120
address = connect_to;
1619
2121
1620
2122
if(quit_now){
1621
2123
goto end;
1622
2124
}
1623
2125
1624
2126
while(not quit_now){
1625
2127
ret = start_mandos_communication(address, port, if_index, af);
1626
2128
if(quit_now or ret == 0){
1627
2129
break;
1628
2130
}
1629
sleep(15);
1630
};
1631
2131
if(debug){
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
2134
}
2135
sleep((int)retry_interval);
2136
}
2137
1632
2138
if (not quit_now){
1633
2139
exitcode = EXIT_SUCCESS;
1634
2140
}
1635
2141
1636
2142
goto end;
1637
2143
}
1638
2144
1660
2166
1661
2167
/* Check if creating the Avahi server object succeeded */
1662
2168
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
1665
2171
exitcode = EX_UNAVAILABLE;
1666
2172
goto end;
1667
2173
}
1675
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
2182
NULL, 0, browse_callback, NULL);
1677
2183
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
1680
2186
exitcode = EX_UNAVAILABLE;
1681
2187
goto end;
1682
2188
}
1688
2194
/* Run the main loop */
1689
2195
1690
2196
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
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
}
1695
2206
1696
2207
end:
1697
2208
1698
2209
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2211
}
1701
2212
1702
2213
/* Cleanup things */
1719
2230
gpgme_release(mc.ctx);
1720
2231
}
1721
2232
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
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
{
1725
2249
errno = 0;
1726
2250
ret = seteuid(0);
1727
2251
if(ret == -1){
1728
perror("seteuid");
2252
perror_plus("seteuid");
1729
2253
}
1730
if(geteuid() == 0){
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
1731
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
2258
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
1735
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
2263
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1739
2265
}
1740
2266
}
1741
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
2268
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2269
perror_plus("close");
1750
2270
}
1751
2271
}
1752
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
1753
2279
1754
/* Removes the temp directory used by GPGME */
2280
/* Removes the GPGME temp directory and all files inside */
1755
2281
if(tempdir_created){
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
}
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];
1776
2289
char *fullname = NULL;
1777
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2291
direntry->d_name);
1779
2292
if(ret < 0){
1780
perror("asprintf");
2293
perror_plus("asprintf");
1781
2294
continue;
1782
2295
}
1783
2296
ret = remove(fullname);
1784
2297
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
1787
2300
}
1788
2301
free(fullname);
1789
2302
}
1790
closedir(d);
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");
1791
2309
}
1792
2310
ret = rmdir(tempdir);
1793
2311
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2312
perror_plus("rmdir");
1795
2313
}
1796
2314
}
1797
2315
1802
2320
&old_sigterm_action,
1803
2321
NULL));
1804
2322
if(ret == -1){
1805
perror("sigaction");
2323
perror_plus("sigaction");
1806
2324
}
1807
2325
do {
1808
2326
ret = raise(signal_received);
1809
2327
} while(ret != 0 and errno == EINTR);
1810
2328
if(ret != 0){
1811
perror("raise");
2329
perror_plus("raise");
1812
2330
abort();
1813
2331
}
1814
2332
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0