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- Committer: Teddy Hogeborn
- Date: 2011-07-13 02:24:39 UTC
- mfrom: (24.1.174 mandos)
- Revision ID: teddy@fukt.bsnet.se-20110713022439-wbv6kghshdsc2x24
Merge from Björn.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
76
setgid(), pause() */
77
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
88
96
89
#ifdef __linux__
97
90
#include <sys/klog.h> /* klogctl() */
115
108
init_gnutls_session(),
116
109
GNUTLS_* */
117
110
#include <gnutls/openpgp.h>
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
120
113
121
114
/* GPGME */
122
115
#include <gpgme.h> /* All GPGME types, constants and
130
123
#define PATHDIR "/conf/conf.d/mandos"
131
124
#define SECKEY "seckey.txt"
132
125
#define PUBKEY "pubkey.txt"
133
#define HOOKDIR "/lib/mandos/network-hooks.d"
134
126
135
127
bool debug = false;
136
128
static const char mandos_protocol_version[] = "1";
137
129
const char *argp_program_version = "mandos-client " VERSION;
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
139
131
static const char sys_class_net[] = "/sys/class/net";
140
132
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
144
133
145
134
/* Doubly linked list that need to be circularly linked when used */
146
135
typedef struct server{
176
165
177
166
/* Function to use when printing errors */
178
167
void perror_plus(const char *print_text){
179
int e = errno;
180
168
fprintf(stderr, "Mandos plugin %s: ",
181
169
program_invocation_short_name);
182
errno = e;
183
170
perror(print_text);
184
171
}
185
172
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
173
/*
197
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
175
* bytes. "buffer_capacity" is how much is currently allocated,
199
176
* "buffer_length" is how much is already used.
200
177
*/
201
178
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
179
size_t buffer_capacity){
203
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
182
if(buffer == NULL){
210
187
return buffer_capacity;
211
188
}
212
189
213
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
216
193
int ret;
217
194
server *new_server = malloc(sizeof(server));
218
195
if(new_server == NULL){
219
196
perror_plus("malloc");
220
return false;
197
return -1;
221
198
}
222
199
*new_server = (server){ .ip = strdup(ip),
223
.port = port,
224
.if_index = if_index,
225
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
226
203
if(new_server->ip == NULL){
227
204
perror_plus("strdup");
228
return false;
205
return -1;
229
206
}
230
/* Special case of first server */
207
/* unique case of first server */
231
208
if (mc.current_server == NULL){
232
209
new_server->next = new_server;
233
210
new_server->prev = new_server;
234
211
mc.current_server = new_server;
235
/* Place the new server last in the list */
212
/* Placing the new server last in the list */
236
213
} else {
237
214
new_server->next = mc.current_server;
238
215
new_server->prev = mc.current_server->prev;
242
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
220
if(ret == -1){
244
221
perror_plus("clock_gettime");
245
return false;
222
return -1;
246
223
}
247
return true;
224
return 0;
248
225
}
249
226
250
227
/*
251
228
* Initialize GPGME.
252
229
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
255
232
gpgme_error_t rc;
256
233
gpgme_engine_info_t engine_info;
257
234
272
249
273
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
274
251
if(rc != GPG_ERR_NO_ERROR){
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
277
254
return false;
278
255
}
279
256
280
257
rc = gpgme_op_import(mc.ctx, pgp_data);
281
258
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
284
261
return false;
285
262
}
286
263
293
270
}
294
271
295
272
if(debug){
296
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
297
274
}
298
275
299
276
/* Init GPGME */
300
277
gpgme_check_version(NULL);
301
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
302
279
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
305
282
return false;
306
283
}
307
284
308
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
309
286
rc = gpgme_get_engine_info(&engine_info);
310
287
if(rc != GPG_ERR_NO_ERROR){
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
313
290
return false;
314
291
}
315
292
while(engine_info != NULL){
321
298
engine_info = engine_info->next;
322
299
}
323
300
if(engine_info == NULL){
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
326
302
return false;
327
303
}
328
304
329
305
/* Create new GPGME "context" */
330
306
rc = gpgme_new(&(mc.ctx));
331
307
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
335
310
return false;
336
311
}
337
312
356
331
ssize_t plaintext_length = 0;
357
332
358
333
if(debug){
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
360
335
}
361
336
362
337
/* Create new GPGME data buffer from memory cryptotext */
363
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
364
339
0);
365
340
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
368
343
return -1;
369
344
}
370
345
371
346
/* Create new empty GPGME data buffer for the plaintext */
372
347
rc = gpgme_data_new(&dh_plain);
373
348
if(rc != GPG_ERR_NO_ERROR){
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
377
351
gpgme_data_release(dh_crypto);
378
352
return -1;
379
353
}
382
356
data buffer */
383
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
384
358
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
387
361
plaintext_length = -1;
388
362
if(debug){
389
363
gpgme_decrypt_result_t result;
390
364
result = gpgme_op_decrypt_result(mc.ctx);
391
365
if(result == NULL){
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
393
367
} else {
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
398
372
if(result->file_name != NULL){
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
400
374
}
401
375
gpgme_recipient_t recipient;
402
376
recipient = result->recipients;
403
377
while(recipient != NULL){
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "No" : "Yes");
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
411
384
recipient = recipient->next;
412
385
}
413
386
}
416
389
}
417
390
418
391
if(debug){
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
420
393
}
421
394
422
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
429
402
*plaintext = NULL;
430
403
while(true){
431
404
plaintext_capacity = incbuffer(plaintext,
432
(size_t)plaintext_length,
433
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
434
407
if(plaintext_capacity == 0){
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
438
411
}
439
412
440
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
453
426
}
454
427
455
428
if(debug){
456
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
457
430
for(ssize_t i = 0; i < plaintext_length; i++){
458
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
459
432
}
481
454
/* GnuTLS log function callback */
482
455
static void debuggnutls(__attribute__((unused)) int level,
483
456
const char* string){
484
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
485
458
}
486
459
487
460
static int init_gnutls_global(const char *pubkeyfilename,
489
462
int ret;
490
463
491
464
if(debug){
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
493
466
}
494
467
495
468
ret = gnutls_global_init();
496
469
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
499
472
return -1;
500
473
}
501
474
510
483
/* OpenPGP credentials */
511
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
512
485
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
515
488
gnutls_global_deinit();
516
489
return -1;
517
490
}
518
491
519
492
if(debug){
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
524
496
}
525
497
526
498
ret = gnutls_certificate_set_openpgp_key_file
527
499
(mc.cred, pubkeyfilename, seckeyfilename,
528
500
GNUTLS_OPENPGP_FMT_BASE64);
529
501
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
safer_gnutls_strerror(ret));
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
535
507
goto globalfail;
536
508
}
537
509
538
510
/* GnuTLS server initialization */
539
511
ret = gnutls_dh_params_init(&mc.dh_params);
540
512
if(ret != GNUTLS_E_SUCCESS){
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
544
515
goto globalfail;
545
516
}
546
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
518
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
550
521
goto globalfail;
551
522
}
552
523
572
543
}
573
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
545
if(ret != GNUTLS_E_SUCCESS){
575
fprintf_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
578
548
}
579
549
580
550
{
587
557
}
588
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
559
if(ret != GNUTLS_E_SUCCESS){
590
fprintf_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
593
563
gnutls_deinit(*session);
594
564
return -1;
595
565
}
604
574
}
605
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
576
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
609
579
gnutls_deinit(*session);
610
580
return -1;
611
581
}
656
626
pf = PF_INET;
657
627
break;
658
628
default:
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
660
630
errno = EINVAL;
661
631
return -1;
662
632
}
667
637
}
668
638
669
639
if(debug){
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
672
642
}
673
643
674
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
700
670
}
701
671
if(ret == 0){
702
672
int e = errno;
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
704
674
errno = e;
705
675
goto mandos_end;
706
676
}
711
681
712
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
684
-Wunreachable-code*/
715
685
if(if_index == AVAHI_IF_UNSPEC){
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
718
688
errno = EINVAL;
719
689
goto mandos_end;
720
690
}
738
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
709
perror_plus("if_indextoname");
740
710
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
743
713
}
744
714
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
747
717
}
748
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
759
729
perror_plus("inet_ntop");
760
730
} else {
761
731
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
763
733
}
764
734
}
765
735
}
793
763
while(true){
794
764
size_t out_size = strlen(out);
795
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
796
out_size - written));
766
out_size - written));
797
767
if(ret == -1){
798
768
int e = errno;
799
769
perror_plus("write");
819
789
}
820
790
821
791
if(debug){
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
823
793
}
824
794
825
795
if(quit_now){
827
797
goto mandos_end;
828
798
}
829
799
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
835
802
836
803
if(quit_now){
837
804
errno = EINTR;
848
815
849
816
if(ret != GNUTLS_E_SUCCESS){
850
817
if(debug){
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
852
819
gnutls_perror(ret);
853
820
}
854
821
errno = EPROTO;
858
825
/* Read OpenPGP packet that contains the wanted password */
859
826
860
827
if(debug){
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
863
830
}
864
831
865
832
while(true){
870
837
}
871
838
872
839
buffer_capacity = incbuffer(&buffer, buffer_length,
873
buffer_capacity);
840
buffer_capacity);
874
841
if(buffer_capacity == 0){
875
842
int e = errno;
876
843
perror_plus("incbuffer");
903
870
}
904
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
872
if(ret < 0){
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
908
874
gnutls_perror(ret);
909
875
errno = EPROTO;
910
876
goto mandos_end;
911
877
}
912
878
break;
913
879
default:
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
916
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
883
errno = EIO;
918
884
goto mandos_end;
923
889
}
924
890
925
891
if(debug){
926
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
927
893
}
928
894
929
895
if(quit_now){
941
907
942
908
if(buffer_length > 0){
943
909
ssize_t decrypted_buffer_size;
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
945
912
&decrypted_buffer);
946
913
if(decrypted_buffer_size >= 0){
947
914
958
925
if(ret == 0 and ferror(stdout)){
959
926
int e = errno;
960
927
if(debug){
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
963
930
}
964
931
errno = e;
965
932
goto mandos_end;
1022
989
switch(event){
1023
990
default:
1024
991
case AVAHI_RESOLVER_FAILURE:
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1029
995
break;
1030
996
1031
997
case AVAHI_RESOLVER_FOUND:
1033
999
char ip[AVAHI_ADDRESS_STR_MAX];
1034
1000
avahi_address_snprint(ip, sizeof(ip), address);
1035
1001
if(debug){
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
host_name, ip, (intmax_t)interface, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1039
1005
}
1040
1006
int ret = start_mandos_communication(ip, port, interface,
1041
1007
avahi_proto_to_af(proto));
1042
1008
if(ret == 0){
1043
1009
avahi_simple_poll_quit(mc.simple_poll);
1044
1010
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1050
1013
}
1051
1014
}
1052
1015
}
1076
1039
default:
1077
1040
case AVAHI_BROWSER_FAILURE:
1078
1041
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1081
1044
avahi_simple_poll_quit(mc.simple_poll);
1082
1045
return;
1083
1046
1090
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
1054
name, type, domain, protocol, 0,
1092
1055
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1096
1058
break;
1097
1059
1098
1060
case AVAHI_BROWSER_REMOVE:
1101
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1102
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1103
1065
if(debug){
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1106
1067
}
1107
1068
break;
1108
1069
}
1123
1084
errno = old_errno;
1124
1085
}
1125
1086
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1140
1143
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1144
1146
}
1145
return false;
1147
free(flagstring);
1148
return 0;
1146
1149
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1154
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
1157
}
1158
return false;
1158
return 0;
1159
1159
}
1160
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
1165
}
1166
return true;
1166
return 1;
1167
1167
}
1168
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1170
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
1173
}
1174
return false;
1174
return 0;
1175
1175
}
1176
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1178
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
1181
}
1182
return false;
1182
return 0;
1183
1183
}
1184
1185
1184
/* Accept this device */
1186
1185
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1213
1188
}
1214
1189
return 1;
1215
1190
}
1216
1191
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
1192
int notdotentries(const struct dirent *direntry){
1250
1193
/* Skip "." and ".." */
1251
1194
if(direntry->d_name[0] == '.'
1257
1200
return 1;
1258
1201
}
1259
1202
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
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
1204
int ret;
1323
1205
struct timespec now;
1324
1206
struct timespec waited_time;
1325
1207
intmax_t block_time;
1326
1208
1327
1209
while(true){
1328
1210
if(mc.current_server == NULL){
1329
1211
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1332
1214
}
1333
1215
ret = avahi_simple_poll_iterate(s, -1);
1334
1216
} else {
1335
1217
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1338
1220
}
1339
1221
/* the current time */
1340
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1354
1236
block_time = ((retry_interval
1355
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1239
1358
1240
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1361
1242
}
1362
1243
1363
1244
if(block_time <= 0){
1364
1245
ret = start_mandos_communication(mc.current_server->ip,
1365
1246
mc.current_server->port,
1383
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1265
}
1385
1266
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1387
1268
return (ret != 1) ? ret : 0;
1388
1269
}
1389
1270
}
1390
1271
}
1391
1272
}
1392
1273
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
1743
1274
int main(int argc, char *argv[]){
1744
1275
AvahiSServiceBrowser *sb = NULL;
1745
error_t ret_errno;
1276
int error;
1746
1277
int ret;
1747
1278
intmax_t tmpmax;
1748
1279
char *tmp;
1749
1280
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1754
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1755
1288
bool tempdir_created = false;
1756
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
1290
const char *seckey = PATHDIR "/" SECKEY;
1758
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
1292
1762
1293
bool gnutls_initialized = false;
1763
1294
bool gpgme_initialized = false;
1825
1356
.group = 2 },
1826
1357
{ .name = "retry", .key = 132,
1827
1358
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
1833
1360
.group = 2 },
1834
1361
/*
1835
1362
* These reproduce what we would get without ARGP_NO_HELP
1854
1381
connect_to = arg;
1855
1382
break;
1856
1383
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1384
interface = arg;
1862
1385
break;
1863
1386
case 's': /* --seckey */
1864
1387
seckey = arg;
1888
1411
errno = 0;
1889
1412
retry_interval = strtod(arg, &tmp);
1890
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
1893
1415
argp_error(state, "Bad retry interval");
1894
1416
}
1895
1417
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
break;
1899
1418
/*
1900
1419
* These reproduce what we would get without ARGP_NO_HELP
1901
1420
*/
1907
1426
argp_state_help(state, state->out_stream,
1908
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
1428
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1911
1430
exit(argp_err_exit_status);
1912
1431
break;
1913
1432
default:
1936
1455
goto end;
1937
1456
}
1938
1457
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2028
}
2029
1458
2030
1459
if(not debug){
2031
1460
avahi_set_log_function(empty_log);
2032
1461
}
1462
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1466
alphasort);
1467
if(ret >= 1){
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1470
if(debug){
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1472
}
1473
if(interface == NULL){
1474
perror_plus("malloc");
1475
free(direntries);
1476
exitcode = EXIT_FAILURE;
1477
goto end;
1478
}
1479
free(direntries);
1480
} else {
1481
free(direntries);
1482
fprintf(stderr, "Could not find a network interface\n");
1483
exitcode = EXIT_FAILURE;
1484
goto end;
1485
}
1486
}
2033
1487
2034
1488
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2035
1489
from the signal handler */
2037
1491
srand((unsigned int) time(NULL));
2038
1492
mc.simple_poll = avahi_simple_poll_new();
2039
1493
if(mc.simple_poll == NULL){
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2042
1495
exitcode = EX_UNAVAILABLE;
2043
1496
goto end;
2044
1497
}
2106
1559
}
2107
1560
}
2108
1561
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
1562
/* If the interface is down, bring it up */
1563
if(strcmp(interface, "none") != 0){
1564
if_index = (AvahiIfIndex) if_nametoindex(interface);
1565
if(if_index == 0){
1566
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1568
goto end;
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
/* Re-raise priviliges */
1576
errno = 0;
1577
ret = seteuid(0);
1578
if(ret == -1){
1579
perror_plus("seteuid");
1580
}
1581
1582
#ifdef __linux__
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1584
messages about the network interface to mess up the prompt */
1585
ret = klogctl(8, NULL, 5);
1586
bool restore_loglevel = true;
1587
if(ret == -1){
1588
restore_loglevel = false;
1589
perror_plus("klogctl");
1590
}
1591
#endif /* __linux__ */
1592
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1594
if(sd < 0){
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1597
#ifdef __linux__
1598
if(restore_loglevel){
1599
ret = klogctl(7, NULL, 0);
1600
if(ret == -1){
1601
perror_plus("klogctl");
1602
}
1603
}
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1606
errno = 0;
1607
ret = seteuid(uid);
1608
if(ret == -1){
1609
perror_plus("seteuid");
1610
}
1611
goto end;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
perror_plus("ioctl SIOCGIFFLAGS");
1617
#ifdef __linux__
1618
if(restore_loglevel){
1619
ret = klogctl(7, NULL, 0);
1620
if(ret == -1){
1621
perror_plus("klogctl");
1622
}
1623
}
1624
#endif /* __linux__ */
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1627
errno = 0;
1628
ret = seteuid(uid);
1629
if(ret == -1){
1630
perror_plus("seteuid");
1631
}
1632
goto end;
1633
}
1634
if((network.ifr_flags & IFF_UP) == 0){
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1638
if(ret == -1){
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1642
#ifdef __linux__
1643
if(restore_loglevel){
1644
ret = klogctl(7, NULL, 0);
1645
if(ret == -1){
1646
perror_plus("klogctl");
1647
}
1648
}
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1651
errno = 0;
1652
ret = seteuid(uid);
1653
if(ret == -1){
1654
perror_plus("seteuid");
1655
}
1656
goto end;
1657
}
1658
}
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1661
for(int i=0; i < delay * 4; i++){
1662
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1663
if(ret == -1){
1664
perror_plus("ioctl SIOCGIFFLAGS");
1665
} else if(network.ifr_flags & IFF_RUNNING){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1677
if(ret == -1){
1678
perror_plus("close");
1679
}
1680
}
1681
#ifdef __linux__
1682
if(restore_loglevel){
1683
/* Restores kernel loglevel to default */
1684
ret = klogctl(7, NULL, 0);
1685
if(ret == -1){
1686
perror_plus("klogctl");
1687
}
1688
}
1689
#endif /* __linux__ */
1690
/* Lower privileges */
1691
errno = 0;
1692
if(take_down_interface){
1693
/* Lower privileges */
1694
ret = seteuid(uid);
1695
if(ret == -1){
1696
perror_plus("seteuid");
1697
}
2130
1698
} else {
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
1699
/* Lower privileges permanently */
1700
ret = setuid(uid);
1701
if(ret == -1){
1702
perror_plus("setuid");
2164
1703
}
2165
1704
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
2172
1705
}
2173
1706
2174
1707
if(quit_now){
2177
1710
2178
1711
ret = init_gnutls_global(pubkey, seckey);
2179
1712
if(ret == -1){
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
1713
fprintf(stderr, "init_gnutls_global failed\n");
2181
1714
exitcode = EX_UNAVAILABLE;
2182
1715
goto end;
2183
1716
} else {
2199
1732
}
2200
1733
2201
1734
if(not init_gpgme(pubkey, seckey, tempdir)){
2202
fprintf_plus(stderr, "init_gpgme failed\n");
1735
fprintf(stderr, "init_gpgme failed\n");
2203
1736
exitcode = EX_UNAVAILABLE;
2204
1737
goto end;
2205
1738
} else {
2214
1747
/* Connect directly, do not use Zeroconf */
2215
1748
/* (Mainly meant for debugging) */
2216
1749
char *address = strrchr(connect_to, ':');
2217
2218
1750
if(address == NULL){
2219
fprintf_plus(stderr, "No colon in address\n");
1751
fprintf(stderr, "No colon in address\n");
2220
1752
exitcode = EX_USAGE;
2221
1753
goto end;
2222
1754
}
2230
1762
tmpmax = strtoimax(address+1, &tmp, 10);
2231
1763
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
1764
or tmpmax != (uint16_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
1765
fprintf(stderr, "Bad port number\n");
2234
1766
exitcode = EX_USAGE;
2235
1767
goto end;
2236
1768
}
2241
1773
2242
1774
port = (uint16_t)tmpmax;
2243
1775
*address = '\0';
1776
address = connect_to;
2244
1777
/* Colon in address indicates IPv6 */
2245
1778
int af;
2246
if(strchr(connect_to, ':') != NULL){
1779
if(strchr(address, ':') != NULL){
2247
1780
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
2254
1781
} else {
2255
1782
af = AF_INET;
2256
1783
}
2257
address = connect_to;
2258
1784
2259
1785
if(quit_now){
2260
1786
goto end;
2261
1787
}
2262
1788
2263
1789
while(not quit_now){
2264
1790
ret = start_mandos_communication(address, port, if_index, af);
2265
1791
if(quit_now or ret == 0){
2266
1792
break;
2267
1793
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
1794
sleep((int)retry_interval or 1);
1795
};
1796
2275
1797
if (not quit_now){
2276
1798
exitcode = EXIT_SUCCESS;
2277
1799
}
2278
1800
2279
1801
goto end;
2280
1802
}
2281
1803
2295
1817
/* Allocate a new server */
2296
1818
mc.server = avahi_server_new(avahi_simple_poll_get
2297
1819
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
1820
NULL, &error);
2299
1821
2300
1822
/* Free the Avahi configuration data */
2301
1823
avahi_server_config_free(&config);
2303
1825
2304
1826
/* Check if creating the Avahi server object succeeded */
2305
1827
if(mc.server == NULL){
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
1828
fprintf(stderr, "Failed to create Avahi server: %s\n",
1829
avahi_strerror(error));
2308
1830
exitcode = EX_UNAVAILABLE;
2309
1831
goto end;
2310
1832
}
2318
1840
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
1841
NULL, 0, browse_callback, NULL);
2320
1842
if(sb == NULL){
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
1843
fprintf(stderr, "Failed to create service browser: %s\n",
1844
avahi_strerror(avahi_server_errno(mc.server)));
2323
1845
exitcode = EX_UNAVAILABLE;
2324
1846
goto end;
2325
1847
}
2331
1853
/* Run the main loop */
2332
1854
2333
1855
if(debug){
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
1856
fprintf(stderr, "Starting Avahi loop search\n");
2335
1857
}
2336
1858
2337
1859
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
1860
(int)(retry_interval * 1000));
2339
1861
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
1862
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1863
(ret == 0) ? "successfully" : "with error");
2342
1864
}
2343
1865
2344
1866
end:
2345
1867
2346
1868
if(debug){
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1869
fprintf(stderr, "%s exiting\n", argv[0]);
2348
1870
}
2349
1871
2350
1872
/* Cleanup things */
2366
1888
if(gpgme_initialized){
2367
1889
gpgme_release(mc.ctx);
2368
1890
}
2369
1891
2370
1892
/* Cleans up the circular linked list of Mandos servers the client
2371
1893
has seen */
2372
1894
if(mc.current_server != NULL){
2378
1900
}
2379
1901
}
2380
1902
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1906
errno = 0;
1907
ret = seteuid(0);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
if(geteuid() == 0){
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1913
if(ret == -1){
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2398
1920
}
2399
1921
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1923
if(ret == -1){
1924
perror_plus("close");
1925
}
1926
/* Lower privileges permanently */
1927
errno = 0;
1928
ret = setuid(uid);
1929
if(ret == -1){
1930
perror_plus("setuid");
2403
1931
}
2404
1932
}
2405
2406
lower_privileges_permanently();
2407
1933
}
2408
1934
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
1935
/* Removes the GPGME temp directory and all files inside */
2413
1936
if(tempdir_created){
2414
1937
struct dirent **direntries = NULL;
2415
1938
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1940
if (ret > 0){
1941
for(int i = 0; i < ret; i++){
2420
1942
direntry = direntries[i];
2421
1943
char *fullname = NULL;
2422
1944
ret = asprintf(&fullname, "%s/%s", tempdir,
2427
1949
}
2428
1950
ret = remove(fullname);
2429
1951
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1952
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1953
strerror(errno));
2432
1954
}
2433
1955
free(fullname);
2434
1956
}
2435
1957
}
2436
1958
2437
/* need to clean even if 0 because man page doesn't specify */
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1960
specify */
2438
1961
free(direntries);
2439
if (numentries == -1){
1962
if (ret == -1){
2440
1963
perror_plus("scandir");
2441
1964
}
2442
1965
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0