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- Committer: teddy at bsnet
- Date: 2011-11-28 00:27:49 UTC
- mto: (237.15.12 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111128002749-hr0te9hsoqfzvu01
* network-hooks.d/bridge: Use "/usr/sbin/brctl" explicitly.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
* plugins.d/mandos-client.c (run_network_hooks): Raise priviliges in
child process.
(main): Do not use getuid() to check if running setuid root. Do not
raise privileges for run_network_hooks.
- files added:
- debian/source/local-options
- network-hooks.d
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
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() */
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() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
76
setgid(), pause(), _exit() */
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() */
88
91
89
92
#ifdef __linux__
90
93
#include <sys/klog.h> /* klogctl() */
108
111
init_gnutls_session(),
109
112
GNUTLS_* */
110
113
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
113
116
114
117
/* GPGME */
115
118
#include <gpgme.h> /* All GPGME types, constants and
123
126
#define PATHDIR "/conf/conf.d/mandos"
124
127
#define SECKEY "seckey.txt"
125
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
130
127
131
bool debug = false;
128
132
static const char mandos_protocol_version[] = "1";
129
133
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
135
static const char sys_class_net[] = "/sys/class/net";
132
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
133
138
134
139
/* Doubly linked list that need to be circularly linked when used */
135
140
typedef struct server{
170
175
perror(print_text);
171
176
}
172
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
173
187
/*
174
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
189
* bytes. "buffer_capacity" is how much is currently allocated,
176
190
* "buffer_length" is how much is already used.
177
191
*/
178
192
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
193
size_t buffer_capacity){
180
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
196
if(buffer == NULL){
187
201
return buffer_capacity;
188
202
}
189
203
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
193
207
int ret;
194
208
server *new_server = malloc(sizeof(server));
195
209
if(new_server == NULL){
197
211
return -1;
198
212
}
199
213
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
214
.port = port,
215
.if_index = if_index,
216
.af = af };
203
217
if(new_server->ip == NULL){
204
218
perror_plus("strdup");
205
219
return -1;
206
220
}
207
/* unique case of first server */
221
/* Special case of first server */
208
222
if (mc.current_server == NULL){
209
223
new_server->next = new_server;
210
224
new_server->prev = new_server;
211
225
mc.current_server = new_server;
212
/* Placing the new server last in the list */
226
/* Place the new server last in the list */
213
227
} else {
214
228
new_server->next = mc.current_server;
215
229
new_server->prev = mc.current_server->prev;
227
241
/*
228
242
* Initialize GPGME.
229
243
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
232
246
gpgme_error_t rc;
233
247
gpgme_engine_info_t engine_info;
234
248
249
263
250
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
265
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
254
268
return false;
255
269
}
256
270
257
271
rc = gpgme_op_import(mc.ctx, pgp_data);
258
272
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
261
275
return false;
262
276
}
263
277
270
284
}
271
285
272
286
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
287
fprintf_plus(stderr, "Initializing GPGME\n");
274
288
}
275
289
276
290
/* Init GPGME */
277
291
gpgme_check_version(NULL);
278
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
293
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
282
296
return false;
283
297
}
284
298
285
/* Set GPGME home directory for the OpenPGP engine only */
299
/* Set GPGME home directory for the OpenPGP engine only */
286
300
rc = gpgme_get_engine_info(&engine_info);
287
301
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
290
304
return false;
291
305
}
292
306
while(engine_info != NULL){
298
312
engine_info = engine_info->next;
299
313
}
300
314
if(engine_info == NULL){
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
302
317
return false;
303
318
}
304
319
305
320
/* Create new GPGME "context" */
306
321
rc = gpgme_new(&(mc.ctx));
307
322
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
310
326
return false;
311
327
}
312
328
331
347
ssize_t plaintext_length = 0;
332
348
333
349
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
351
}
336
352
337
353
/* Create new GPGME data buffer from memory cryptotext */
338
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
355
0);
340
356
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
343
359
return -1;
344
360
}
345
361
346
362
/* Create new empty GPGME data buffer for the plaintext */
347
363
rc = gpgme_data_new(&dh_plain);
348
364
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
351
368
gpgme_data_release(dh_crypto);
352
369
return -1;
353
370
}
356
373
data buffer */
357
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
358
375
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
361
378
plaintext_length = -1;
362
379
if(debug){
363
380
gpgme_decrypt_result_t result;
364
381
result = gpgme_op_decrypt_result(mc.ctx);
365
382
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
384
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
372
389
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
391
}
375
392
gpgme_recipient_t recipient;
376
393
recipient = result->recipients;
377
394
while(recipient != NULL){
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");
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
384
402
recipient = recipient->next;
385
403
}
386
404
}
389
407
}
390
408
391
409
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
411
}
394
412
395
413
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
420
*plaintext = NULL;
403
421
while(true){
404
422
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
423
(size_t)plaintext_length,
424
plaintext_capacity);
407
425
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
411
429
}
412
430
413
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
444
}
427
445
428
446
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
447
fprintf_plus(stderr, "Decrypted password is: ");
430
448
for(ssize_t i = 0; i < plaintext_length; i++){
431
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
450
}
454
472
/* GnuTLS log function callback */
455
473
static void debuggnutls(__attribute__((unused)) int level,
456
474
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
475
fprintf_plus(stderr, "GnuTLS: %s", string);
458
476
}
459
477
460
478
static int init_gnutls_global(const char *pubkeyfilename,
462
480
int ret;
463
481
464
482
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
484
}
467
485
468
486
ret = gnutls_global_init();
469
487
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
472
490
return -1;
473
491
}
474
492
483
501
/* OpenPGP credentials */
484
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
485
503
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
488
506
gnutls_global_deinit();
489
507
return -1;
490
508
}
491
509
492
510
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
496
515
}
497
516
498
517
ret = gnutls_certificate_set_openpgp_key_file
499
518
(mc.cred, pubkeyfilename, seckeyfilename,
500
519
GNUTLS_OPENPGP_FMT_BASE64);
501
520
if(ret != GNUTLS_E_SUCCESS){
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));
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
507
526
goto globalfail;
508
527
}
509
528
510
529
/* GnuTLS server initialization */
511
530
ret = gnutls_dh_params_init(&mc.dh_params);
512
531
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
515
535
goto globalfail;
516
536
}
517
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
538
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
521
541
goto globalfail;
522
542
}
523
543
543
563
}
544
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
565
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
548
569
}
549
570
550
571
{
557
578
}
558
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
580
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
563
584
gnutls_deinit(*session);
564
585
return -1;
565
586
}
574
595
}
575
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
597
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
579
600
gnutls_deinit(*session);
580
601
return -1;
581
602
}
626
647
pf = PF_INET;
627
648
break;
628
649
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
651
errno = EINVAL;
631
652
return -1;
632
653
}
637
658
}
638
659
639
660
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
642
663
}
643
664
644
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
691
}
671
692
if(ret == 0){
672
693
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
695
errno = e;
675
696
goto mandos_end;
676
697
}
681
702
682
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
705
-Wunreachable-code*/
685
706
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
688
709
errno = EINVAL;
689
710
goto mandos_end;
690
711
}
708
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
730
perror_plus("if_indextoname");
710
731
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
713
734
}
714
735
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
717
738
}
718
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
750
perror_plus("inet_ntop");
730
751
} else {
731
752
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
754
}
734
755
}
735
756
}
763
784
while(true){
764
785
size_t out_size = strlen(out);
765
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
787
out_size - written));
767
788
if(ret == -1){
768
789
int e = errno;
769
790
perror_plus("write");
789
810
}
790
811
791
812
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
814
}
794
815
795
816
if(quit_now){
815
836
816
837
if(ret != GNUTLS_E_SUCCESS){
817
838
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
840
gnutls_perror(ret);
820
841
}
821
842
errno = EPROTO;
825
846
/* Read OpenPGP packet that contains the wanted password */
826
847
827
848
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
830
851
}
831
852
832
853
while(true){
837
858
}
838
859
839
860
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
861
buffer_capacity);
841
862
if(buffer_capacity == 0){
842
863
int e = errno;
843
864
perror_plus("incbuffer");
870
891
}
871
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
893
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
874
896
gnutls_perror(ret);
875
897
errno = EPROTO;
876
898
goto mandos_end;
877
899
}
878
900
break;
879
901
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
882
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
905
errno = EIO;
884
906
goto mandos_end;
889
911
}
890
912
891
913
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
914
fprintf_plus(stderr, "Closing TLS session\n");
893
915
}
894
916
895
917
if(quit_now){
907
929
908
930
if(buffer_length > 0){
909
931
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
912
933
&decrypted_buffer);
913
934
if(decrypted_buffer_size >= 0){
914
935
925
946
if(ret == 0 and ferror(stdout)){
926
947
int e = errno;
927
948
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
930
951
}
931
952
errno = e;
932
953
goto mandos_end;
989
1010
switch(event){
990
1011
default:
991
1012
case AVAHI_RESOLVER_FAILURE:
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)));
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
995
1017
break;
996
1018
997
1019
case AVAHI_RESOLVER_FOUND:
999
1021
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1022
avahi_address_snprint(ip, sizeof(ip), address);
1001
1023
if(debug){
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);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
1005
1027
}
1006
1028
int ret = start_mandos_communication(ip, port, interface,
1007
1029
avahi_proto_to_af(proto));
1039
1061
default:
1040
1062
case AVAHI_BROWSER_FAILURE:
1041
1063
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1044
1066
avahi_simple_poll_quit(mc.simple_poll);
1045
1067
return;
1046
1068
1053
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
1076
name, type, domain, protocol, 0,
1055
1077
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1058
1081
break;
1059
1082
1060
1083
case AVAHI_BROWSER_REMOVE:
1063
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1088
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1089
fprintf_plus(stderr, "No Mandos server found, still"
1090
" searching...\n");
1067
1091
}
1068
1092
break;
1069
1093
}
1084
1108
errno = old_errno;
1085
1109
}
1086
1110
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){
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
int ret;
1113
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
if(s < 0){
1116
perror_plus("socket");
1117
return false;
1118
}
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
if(ret == -1){
1143
1122
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1146
1124
}
1147
free(flagstring);
1148
return 0;
1125
return false;
1149
1126
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1127
return true;
1128
}
1129
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1152
1132
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
1134
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1136
ifname);
1157
1137
}
1158
return 0;
1138
return false;
1159
1139
}
1160
1140
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
1142
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1165
1145
}
1166
return 1;
1146
return true;
1167
1147
}
1168
1148
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
1150
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1173
1153
}
1174
return 0;
1154
return false;
1175
1155
}
1176
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1157
if(ifr->ifr_flags & IFF_NOARP){
1178
1158
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1160
ifname);
1181
1161
}
1182
return 0;
1162
return false;
1183
1163
}
1164
1184
1165
/* Accept this device */
1185
1166
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1168
}
1169
return true;
1170
}
1171
1172
/*
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1176
*/
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1179
return 0;
1180
}
1181
1182
struct ifreq ifr;
1183
if(not get_flags(if_entry->d_name, &ifr)){
1184
if(debug){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1187
}
1188
return 0;
1189
}
1190
1191
if(not good_flags(if_entry->d_name, &ifr)){
1192
return 0;
1193
}
1194
return 1;
1195
}
1196
1197
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1188
1236
}
1189
1237
return 1;
1190
1238
}
1200
1248
return 1;
1201
1249
}
1202
1250
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1253
int ret;
1254
size_t sret;
1255
struct stat st;
1256
1257
if((direntry->d_name)[0] == '\0'){
1258
/* Empty name? */
1259
return 0;
1260
}
1261
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1264
"0123456789"
1265
"_-");
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1268
if(debug){
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1270
direntry->d_name);
1271
}
1272
return 0;
1273
}
1274
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1283
if(ret == -1){
1284
if(debug){
1285
perror_plus("Could not stat hook");
1286
}
1287
return 0;
1288
}
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1291
if(debug){
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1293
direntry->d_name);
1294
}
1295
return 0;
1296
}
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1299
if(debug){
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1301
direntry->d_name);
1302
}
1303
return 0;
1304
}
1305
if(debug){
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1307
direntry->d_name);
1308
}
1309
return 1;
1310
}
1311
1203
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
1313
int ret;
1205
1314
struct timespec now;
1206
1315
struct timespec waited_time;
1207
1316
intmax_t block_time;
1208
1317
1209
1318
while(true){
1210
1319
if(mc.current_server == NULL){
1211
1320
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1321
fprintf_plus(stderr, "Wait until first server is found."
1322
" No timeout!\n");
1214
1323
}
1215
1324
ret = avahi_simple_poll_iterate(s, -1);
1216
1325
} else {
1217
1326
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1327
fprintf_plus(stderr, "Check current_server if we should run"
1328
" it, or wait\n");
1220
1329
}
1221
1330
/* the current time */
1222
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1236
1345
block_time = ((retry_interval
1237
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1348
1240
1349
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
block_time);
1242
1352
}
1243
1353
1244
1354
if(block_time <= 0){
1245
1355
ret = start_mandos_communication(mc.current_server->ip,
1246
1356
mc.current_server->port,
1264
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1375
}
1266
1376
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1377
if (ret > 0 or errno != EINTR){
1268
1378
return (ret != 1) ? ret : 0;
1269
1379
}
1270
1380
}
1271
1381
}
1272
1382
}
1273
1383
1384
bool run_network_hooks(const char *mode, const char *interface,
1385
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1391
if(numhooks == -1){
1392
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1400
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1437
close(devnull);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1440
if(ret == -1){
1441
perror_plus("setenv");
1442
_exit(EX_OSERR);
1443
}
1444
ret = setenv("DEVICE", interface, 1);
1445
if(ret == -1){
1446
perror_plus("setenv");
1447
_exit(EX_OSERR);
1448
}
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1450
if(ret == -1){
1451
perror_plus("setenv");
1452
_exit(EX_OSERR);
1453
}
1454
ret = setenv("MODE", mode, 1);
1455
if(ret == -1){
1456
perror_plus("setenv");
1457
_exit(EX_OSERR);
1458
}
1459
char *delaystring;
1460
ret = asprintf(&delaystring, "%f", delay);
1461
if(ret == -1){
1462
perror_plus("asprintf");
1463
_exit(EX_OSERR);
1464
}
1465
ret = setenv("DELAY", delaystring, 1);
1466
if(ret == -1){
1467
free(delaystring);
1468
perror_plus("setenv");
1469
_exit(EX_OSERR);
1470
}
1471
free(delaystring);
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1474
} else {
1475
int status;
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1478
free(fullname);
1479
continue;
1480
}
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1486
free(fullname);
1487
continue;
1488
}
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1492
WTERMSIG(status));
1493
free(fullname);
1494
continue;
1495
} else {
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1498
free(fullname);
1499
continue;
1500
}
1501
}
1502
free(fullname);
1503
if(debug){
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1505
direntry->d_name);
1506
}
1507
}
1508
close(devnull);
1509
}
1510
return true;
1511
}
1512
1274
1513
int main(int argc, char *argv[]){
1275
1514
AvahiSServiceBrowser *sb = NULL;
1276
1515
int error;
1358
1597
.arg = "SECONDS",
1359
1598
.doc = "Retry interval used when denied by the mandos server",
1360
1599
.group = 2 },
1600
{ .name = "network-hook-dir", .key = 133,
1601
.arg = "DIR",
1602
.doc = "Directory where network hooks are located",
1603
.group = 2 },
1361
1604
/*
1362
1605
* These reproduce what we would get without ARGP_NO_HELP
1363
1606
*/
1411
1654
errno = 0;
1412
1655
retry_interval = strtod(arg, &tmp);
1413
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1415
1659
argp_error(state, "Bad retry interval");
1416
1660
}
1417
1661
break;
1662
case 133: /* --network-hook-dir */
1663
hookdir = arg;
1664
break;
1418
1665
/*
1419
1666
* These reproduce what we would get without ARGP_NO_HELP
1420
1667
*/
1426
1673
argp_state_help(state, state->out_stream,
1427
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
1675
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
1679
exit(argp_err_exit_status);
1431
1680
break;
1432
1681
default:
1459
1708
{
1460
1709
/* Work around Debian bug #633582:
1461
1710
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1711
1464
1712
/* Re-raise priviliges */
1465
1713
errno = 0;
1466
1714
ret = seteuid(0);
1467
1715
if(ret == -1){
1468
1716
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
1717
} else {
1718
struct stat st;
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1732
if(ret == -1){
1733
perror_plus("fchown");
1734
}
1735
}
1736
}
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1738
}
1739
}
1740
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1745
} else {
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1747
if(ret == -1){
1748
perror_plus("fstat");
1749
} else {
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1753
if(ret == -1){
1754
perror_plus("fchown");
1755
}
1756
}
1757
}
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1759
}
1760
}
1761
1762
/* Lower privileges */
1763
errno = 0;
1764
ret = seteuid(uid);
1765
if(ret == -1){
1766
perror_plus("seteuid");
1767
}
1768
}
1769
}
1770
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1773
goto end;
1513
1774
}
1514
1775
1515
1776
if(not debug){
1516
1777
avahi_set_log_function(empty_log);
1517
1778
}
1518
1779
1519
1780
if(interface[0] == '\0'){
1520
1781
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1522
1784
alphasort);
1785
if(ret == 0){
1786
/* No up interfaces, look for any good interfaces */
1787
free(direntries);
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1789
alphasort);
1790
}
1523
1791
if(ret >= 1){
1524
/* Pick the first good interface */
1792
/* Pick the first interface returned */
1525
1793
interface = strdup(direntries[0]->d_name);
1526
1794
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1528
1796
}
1529
1797
if(interface == NULL){
1530
1798
perror_plus("malloc");
1535
1803
free(direntries);
1536
1804
} else {
1537
1805
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1539
1807
exitcode = EXIT_FAILURE;
1540
1808
goto end;
1541
1809
}
1547
1815
srand((unsigned int) time(NULL));
1548
1816
mc.simple_poll = avahi_simple_poll_new();
1549
1817
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1551
1820
exitcode = EX_UNAVAILABLE;
1552
1821
goto end;
1553
1822
}
1619
1888
if(strcmp(interface, "none") != 0){
1620
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
1890
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1623
1892
exitcode = EX_UNAVAILABLE;
1624
1893
goto end;
1625
1894
}
1745
2014
#endif /* __linux__ */
1746
2015
/* Lower privileges */
1747
2016
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
2017
/* Lower privileges */
2018
ret = seteuid(uid);
2019
if(ret == -1){
2020
perror_plus("seteuid");
1760
2021
}
1761
2022
}
1762
2023
1766
2027
1767
2028
ret = init_gnutls_global(pubkey, seckey);
1768
2029
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2031
exitcode = EX_UNAVAILABLE;
1771
2032
goto end;
1772
2033
} else {
1788
2049
}
1789
2050
1790
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2052
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2053
exitcode = EX_UNAVAILABLE;
1793
2054
goto end;
1794
2055
} else {
1804
2065
/* (Mainly meant for debugging) */
1805
2066
char *address = strrchr(connect_to, ':');
1806
2067
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2068
fprintf_plus(stderr, "No colon in address\n");
1808
2069
exitcode = EX_USAGE;
1809
2070
goto end;
1810
2071
}
1818
2079
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
2081
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2082
fprintf_plus(stderr, "Bad port number\n");
1822
2083
exitcode = EX_USAGE;
1823
2084
goto end;
1824
2085
}
1829
2090
1830
2091
port = (uint16_t)tmpmax;
1831
2092
*address = '\0';
1832
address = connect_to;
1833
2093
/* Colon in address indicates IPv6 */
1834
2094
int af;
1835
if(strchr(address, ':') != NULL){
2095
if(strchr(connect_to, ':') != NULL){
1836
2096
af = AF_INET6;
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2099
{
2100
connect_to++;
2101
address[-1] = '\0';
2102
}
1837
2103
} else {
1838
2104
af = AF_INET;
1839
2105
}
2106
address = connect_to;
1840
2107
1841
2108
if(quit_now){
1842
2109
goto end;
1843
2110
}
1844
2111
1845
2112
while(not quit_now){
1846
2113
ret = start_mandos_communication(address, port, if_index, af);
1847
2114
if(quit_now or ret == 0){
1848
2115
break;
1849
2116
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
2117
if(debug){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2120
}
2121
sleep((int)retry_interval);
2122
}
2123
1853
2124
if (not quit_now){
1854
2125
exitcode = EXIT_SUCCESS;
1855
2126
}
1856
2127
1857
2128
goto end;
1858
2129
}
1859
2130
1881
2152
1882
2153
/* Check if creating the Avahi server object succeeded */
1883
2154
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
1886
2157
exitcode = EX_UNAVAILABLE;
1887
2158
goto end;
1888
2159
}
1896
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
2168
NULL, 0, browse_callback, NULL);
1898
2169
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
1901
2172
exitcode = EX_UNAVAILABLE;
1902
2173
goto end;
1903
2174
}
1909
2180
/* Run the main loop */
1910
2181
1911
2182
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2184
}
1914
2185
1915
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
2187
(int)(retry_interval * 1000));
1917
2188
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
1920
2191
}
1921
2192
1922
2193
end:
1923
2194
1924
2195
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2197
}
1927
2198
1928
2199
/* Cleanup things */
1944
2215
if(gpgme_initialized){
1945
2216
gpgme_release(mc.ctx);
1946
2217
}
1947
2218
1948
2219
/* Cleans up the circular linked list of Mandos servers the client
1949
2220
has seen */
1950
2221
if(mc.current_server != NULL){
1956
2227
}
1957
2228
}
1958
2229
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Re-raise priviliges */
2234
{
1962
2235
errno = 0;
1963
2236
ret = seteuid(0);
1964
2237
if(ret == -1){
1965
2238
perror_plus("seteuid");
1966
2239
}
1967
if(geteuid() == 0){
2240
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
1968
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
2244
if(ret == -1){
1970
2245
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
2246
} else if(network.ifr_flags & IFF_UP){
1972
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
2249
if(ret == -1){
1979
2254
if(ret == -1){
1980
2255
perror_plus("close");
1981
2256
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
2257
}
1989
2258
}
2259
/* Lower privileges permanently */
2260
errno = 0;
2261
ret = setuid(uid);
2262
if(ret == -1){
2263
perror_plus("setuid");
2264
}
1990
2265
1991
2266
/* Removes the GPGME temp directory and all files inside */
1992
2267
if(tempdir_created){
1993
2268
struct dirent **direntries = NULL;
1994
2269
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2271
alphasort);
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
1998
2274
direntry = direntries[i];
1999
2275
char *fullname = NULL;
2000
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2005
2281
}
2006
2282
ret = remove(fullname);
2007
2283
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
strerror(errno));
2010
2286
}
2011
2287
free(fullname);
2012
2288
}
2013
2289
}
2014
2290
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2291
/* need to clean even if 0 because man page doesn't specify */
2017
2292
free(direntries);
2018
if (ret == -1){
2293
if (numentries == -1){
2019
2294
perror_plus("scandir");
2020
2295
}
2021
2296
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0