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- Committer: Teddy Hogeborn
- Date: 2012-05-26 22:48:45 UTC
- Revision ID: teddy@recompile.se-20120526224845-imaxtrlh3j3yu1ga
* mandos: Change comment.
* mandos-clients.conf.xml (OPTIONS/checker): Rewrote without "you".
(SEE ALSO): Reference fping(8).
* mandos-clients.conf.xml (OPTIONS/checker): Rewrote without "you".
(SEE ALSO): Reference fping(8).
- files added:
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
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";
130
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{
165
170
166
171
/* Function to use when printing errors */
167
172
void perror_plus(const char *print_text){
173
int e = errno;
168
174
fprintf(stderr, "Mandos plugin %s: ",
169
175
program_invocation_short_name);
176
errno = e;
170
177
perror(print_text);
171
178
}
172
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
173
190
/*
174
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
192
* bytes. "buffer_capacity" is how much is currently allocated,
176
193
* "buffer_length" is how much is already used.
177
194
*/
178
195
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
196
size_t buffer_capacity){
180
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
199
if(buffer == NULL){
188
205
}
189
206
190
207
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
194
210
int ret;
195
211
server *new_server = malloc(sizeof(server));
196
212
if(new_server == NULL){
197
213
perror_plus("malloc");
198
return -1;
214
return false;
199
215
}
200
216
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
217
.port = port,
218
.if_index = if_index,
219
.af = af };
204
220
if(new_server->ip == NULL){
205
221
perror_plus("strdup");
206
return -1;
222
return false;
207
223
}
208
224
/* Special case of first server */
209
225
if (mc.current_server == NULL){
220
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
237
if(ret == -1){
222
238
perror_plus("clock_gettime");
223
return -1;
239
return false;
224
240
}
225
return 0;
241
return true;
226
242
}
227
243
228
244
/*
229
245
* Initialize GPGME.
230
246
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
233
249
gpgme_error_t rc;
234
250
gpgme_engine_info_t engine_info;
235
251
250
266
251
267
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
268
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
255
271
return false;
256
272
}
257
273
258
274
rc = gpgme_op_import(mc.ctx, pgp_data);
259
275
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
262
278
return false;
263
279
}
264
280
271
287
}
272
288
273
289
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
290
fprintf_plus(stderr, "Initializing GPGME\n");
275
291
}
276
292
277
293
/* Init GPGME */
278
294
gpgme_check_version(NULL);
279
295
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
296
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
283
299
return false;
284
300
}
285
301
286
302
/* Set GPGME home directory for the OpenPGP engine only */
287
303
rc = gpgme_get_engine_info(&engine_info);
288
304
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
291
307
return false;
292
308
}
293
309
while(engine_info != NULL){
299
315
engine_info = engine_info->next;
300
316
}
301
317
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
303
320
return false;
304
321
}
305
322
306
323
/* Create new GPGME "context" */
307
324
rc = gpgme_new(&(mc.ctx));
308
325
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
311
329
return false;
312
330
}
313
331
332
350
ssize_t plaintext_length = 0;
333
351
334
352
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
354
}
337
355
338
356
/* Create new GPGME data buffer from memory cryptotext */
339
357
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
358
0);
341
359
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
344
362
return -1;
345
363
}
346
364
347
365
/* Create new empty GPGME data buffer for the plaintext */
348
366
rc = gpgme_data_new(&dh_plain);
349
367
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
352
371
gpgme_data_release(dh_crypto);
353
372
return -1;
354
373
}
357
376
data buffer */
358
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
378
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
362
381
plaintext_length = -1;
363
382
if(debug){
364
383
gpgme_decrypt_result_t result;
365
384
result = gpgme_op_decrypt_result(mc.ctx);
366
385
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
387
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
373
392
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
394
}
376
395
gpgme_recipient_t recipient;
377
396
recipient = result->recipients;
378
397
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
385
405
recipient = recipient->next;
386
406
}
387
407
}
390
410
}
391
411
392
412
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
414
}
395
415
396
416
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
423
*plaintext = NULL;
404
424
while(true){
405
425
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
426
(size_t)plaintext_length,
427
plaintext_capacity);
408
428
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
412
432
}
413
433
414
434
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
447
}
428
448
429
449
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
450
fprintf_plus(stderr, "Decrypted password is: ");
431
451
for(ssize_t i = 0; i < plaintext_length; i++){
432
452
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
453
}
455
475
/* GnuTLS log function callback */
456
476
static void debuggnutls(__attribute__((unused)) int level,
457
477
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
478
fprintf_plus(stderr, "GnuTLS: %s", string);
459
479
}
460
480
461
481
static int init_gnutls_global(const char *pubkeyfilename,
463
483
int ret;
464
484
465
485
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
487
}
468
488
469
489
ret = gnutls_global_init();
470
490
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
473
493
return -1;
474
494
}
475
495
484
504
/* OpenPGP credentials */
485
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
506
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
489
509
gnutls_global_deinit();
490
510
return -1;
491
511
}
492
512
493
513
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
497
518
}
498
519
499
520
ret = gnutls_certificate_set_openpgp_key_file
500
521
(mc.cred, pubkeyfilename, seckeyfilename,
501
522
GNUTLS_OPENPGP_FMT_BASE64);
502
523
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
508
529
goto globalfail;
509
530
}
510
531
511
532
/* GnuTLS server initialization */
512
533
ret = gnutls_dh_params_init(&mc.dh_params);
513
534
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
516
538
goto globalfail;
517
539
}
518
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
541
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
522
544
goto globalfail;
523
545
}
524
546
544
566
}
545
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
568
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
549
572
}
550
573
551
574
{
558
581
}
559
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
583
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
564
587
gnutls_deinit(*session);
565
588
return -1;
566
589
}
575
598
}
576
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
600
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
580
603
gnutls_deinit(*session);
581
604
return -1;
582
605
}
627
650
pf = PF_INET;
628
651
break;
629
652
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
654
errno = EINVAL;
632
655
return -1;
633
656
}
638
661
}
639
662
640
663
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
643
666
}
644
667
645
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
694
}
672
695
if(ret == 0){
673
696
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
698
errno = e;
676
699
goto mandos_end;
677
700
}
682
705
683
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
708
-Wunreachable-code*/
686
709
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
689
712
errno = EINVAL;
690
713
goto mandos_end;
691
714
}
709
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
733
perror_plus("if_indextoname");
711
734
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
714
737
}
715
738
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
718
741
}
719
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
753
perror_plus("inet_ntop");
731
754
} else {
732
755
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
757
}
735
758
}
736
759
}
764
787
while(true){
765
788
size_t out_size = strlen(out);
766
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
790
out_size - written));
768
791
if(ret == -1){
769
792
int e = errno;
770
793
perror_plus("write");
790
813
}
791
814
792
815
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
817
}
795
818
796
819
if(quit_now){
798
821
goto mandos_end;
799
822
}
800
823
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
824
/* This casting via intptr_t is to eliminate warning about casting
825
an int to a pointer type. This is exactly how the GnuTLS Guile
826
function "set-session-transport-fd!" does it. */
827
gnutls_transport_set_ptr(session,
828
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
829
804
830
if(quit_now){
805
831
errno = EINTR;
816
842
817
843
if(ret != GNUTLS_E_SUCCESS){
818
844
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
846
gnutls_perror(ret);
821
847
}
822
848
errno = EPROTO;
826
852
/* Read OpenPGP packet that contains the wanted password */
827
853
828
854
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
855
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
856
" %s\n", ip);
831
857
}
832
858
833
859
while(true){
838
864
}
839
865
840
866
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
867
buffer_capacity);
842
868
if(buffer_capacity == 0){
843
869
int e = errno;
844
870
perror_plus("incbuffer");
871
897
}
872
898
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
899
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
900
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
901
"***\n");
875
902
gnutls_perror(ret);
876
903
errno = EPROTO;
877
904
goto mandos_end;
878
905
}
879
906
break;
880
907
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
908
fprintf_plus(stderr, "Unknown error while reading data from"
909
" encrypted session with Mandos server\n");
883
910
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
911
errno = EIO;
885
912
goto mandos_end;
890
917
}
891
918
892
919
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
920
fprintf_plus(stderr, "Closing TLS session\n");
894
921
}
895
922
896
923
if(quit_now){
908
935
909
936
if(buffer_length > 0){
910
937
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
913
939
&decrypted_buffer);
914
940
if(decrypted_buffer_size >= 0){
915
941
926
952
if(ret == 0 and ferror(stdout)){
927
953
int e = errno;
928
954
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
955
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
956
strerror(errno));
931
957
}
932
958
errno = e;
933
959
goto mandos_end;
990
1016
switch(event){
991
1017
default:
992
1018
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
996
1023
break;
997
1024
998
1025
case AVAHI_RESOLVER_FOUND:
1000
1027
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1028
avahi_address_snprint(ip, sizeof(ip), address);
1002
1029
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1030
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
host_name, ip, (intmax_t)interface, port);
1006
1033
}
1007
1034
int ret = start_mandos_communication(ip, port, interface,
1008
1035
avahi_proto_to_af(proto));
1009
1036
if(ret == 0){
1010
1037
avahi_simple_poll_quit(mc.simple_poll);
1011
1038
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
" list\n", name);
1043
}
1014
1044
}
1015
1045
}
1016
1046
}
1040
1070
default:
1041
1071
case AVAHI_BROWSER_FAILURE:
1042
1072
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1045
1075
avahi_simple_poll_quit(mc.simple_poll);
1046
1076
return;
1047
1077
1054
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
1085
name, type, domain, protocol, 0,
1056
1086
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1059
1090
break;
1060
1091
1061
1092
case AVAHI_BROWSER_REMOVE:
1064
1095
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1096
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1097
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1098
fprintf_plus(stderr, "No Mandos server found, still"
1099
" searching...\n");
1068
1100
}
1069
1101
break;
1070
1102
}
1085
1117
errno = old_errno;
1086
1118
}
1087
1119
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
int ret;
1122
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
if(s < 0){
1125
perror_plus("socket");
1126
return false;
1127
}
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
if(ret == -1){
1144
1131
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1132
perror_plus("ioctl SIOCGIFFLAGS");
1147
1133
}
1148
free(flagstring);
1149
return 0;
1134
return false;
1150
1135
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1136
return true;
1137
}
1138
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1153
1141
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1155
1143
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1145
ifname);
1158
1146
}
1159
return 0;
1147
return false;
1160
1148
}
1161
1149
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1163
1151
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1166
1154
}
1167
return 1;
1155
return true;
1168
1156
}
1169
1157
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1171
1159
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1174
1162
}
1175
return 0;
1163
return false;
1176
1164
}
1177
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1166
if(ifr->ifr_flags & IFF_NOARP){
1179
1167
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
ifname);
1182
1170
}
1183
return 0;
1171
return false;
1184
1172
}
1173
1185
1174
/* Accept this device */
1186
1175
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
}
1178
return true;
1179
}
1180
1181
/*
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1185
*/
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
1191
struct ifreq ifr;
1192
if(not get_flags(if_entry->d_name, &ifr)){
1193
if(debug){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1196
}
1197
return 0;
1198
}
1199
1200
if(not good_flags(if_entry->d_name, &ifr)){
1201
return 0;
1202
}
1203
return 1;
1204
}
1205
1206
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1189
1245
}
1190
1246
return 1;
1191
1247
}
1201
1257
return 1;
1202
1258
}
1203
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1204
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
1322
int ret;
1206
1323
struct timespec now;
1210
1327
while(true){
1211
1328
if(mc.current_server == NULL){
1212
1329
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1215
1332
}
1216
1333
ret = avahi_simple_poll_iterate(s, -1);
1217
1334
} else {
1218
1335
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1221
1338
}
1222
1339
/* the current time */
1223
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1239
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1357
1241
1358
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1243
1361
}
1244
1362
1245
1363
if(block_time <= 0){
1265
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1384
}
1267
1385
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1386
if (ret > 0 or errno != EINTR){
1269
1387
return (ret != 1) ? ret : 0;
1270
1388
}
1271
1389
}
1272
1390
}
1273
1391
}
1274
1392
1393
bool run_network_hooks(const char *mode, const char *interface,
1394
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1400
if(numhooks == -1){
1401
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1409
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1478
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1527
}
1528
1275
1529
int main(int argc, char *argv[]){
1276
1530
AvahiSServiceBrowser *sb = NULL;
1277
1531
int error;
1357
1611
.group = 2 },
1358
1612
{ .name = "retry", .key = 132,
1359
1613
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1614
.doc = "Retry interval used when denied by the Mandos server",
1615
.group = 2 },
1616
{ .name = "network-hook-dir", .key = 133,
1617
.arg = "DIR",
1618
.doc = "Directory where network hooks are located",
1361
1619
.group = 2 },
1362
1620
/*
1363
1621
* These reproduce what we would get without ARGP_NO_HELP
1417
1675
argp_error(state, "Bad retry interval");
1418
1676
}
1419
1677
break;
1678
case 133: /* --network-hook-dir */
1679
hookdir = arg;
1680
break;
1420
1681
/*
1421
1682
* These reproduce what we would get without ARGP_NO_HELP
1422
1683
*/
1428
1689
argp_state_help(state, state->out_stream,
1429
1690
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1691
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1693
exit(argp_err_exit_status);
1433
1694
break;
1434
1695
default:
1461
1722
{
1462
1723
/* Work around Debian bug #633582:
1463
1724
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1725
1466
1726
/* Re-raise priviliges */
1467
1727
errno = 0;
1468
1728
ret = seteuid(0);
1469
1729
if(ret == -1){
1470
1730
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1731
} else {
1732
struct stat st;
1733
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1738
} else {
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1740
if(ret == -1){
1741
perror_plus("fstat");
1742
} else {
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1746
if(ret == -1){
1747
perror_plus("fchown");
1748
}
1749
}
1750
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
}
1753
}
1754
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1759
} else {
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1761
if(ret == -1){
1762
perror_plus("fstat");
1763
} else {
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1767
if(ret == -1){
1768
perror_plus("fchown");
1769
}
1770
}
1771
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
1776
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
1781
}
1782
}
1783
}
1784
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
1519
1788
}
1520
1789
1521
1790
if(not debug){
1522
1791
avahi_set_log_function(empty_log);
1523
1792
}
1524
1793
1525
1794
if(interface[0] == '\0'){
1526
1795
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1528
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1529
1805
if(ret >= 1){
1530
/* Pick the first good interface */
1806
/* Pick the first interface returned */
1531
1807
interface = strdup(direntries[0]->d_name);
1532
1808
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1534
1810
}
1535
1811
if(interface == NULL){
1536
1812
perror_plus("malloc");
1541
1817
free(direntries);
1542
1818
} else {
1543
1819
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1545
1821
exitcode = EXIT_FAILURE;
1546
1822
goto end;
1547
1823
}
1553
1829
srand((unsigned int) time(NULL));
1554
1830
mc.simple_poll = avahi_simple_poll_new();
1555
1831
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1557
1834
exitcode = EX_UNAVAILABLE;
1558
1835
goto end;
1559
1836
}
1625
1902
if(strcmp(interface, "none") != 0){
1626
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
1904
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1629
1906
exitcode = EX_UNAVAILABLE;
1630
1907
goto end;
1631
1908
}
1751
2028
#endif /* __linux__ */
1752
2029
/* Lower privileges */
1753
2030
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
1766
2035
}
1767
2036
}
1768
2037
1772
2041
1773
2042
ret = init_gnutls_global(pubkey, seckey);
1774
2043
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2045
exitcode = EX_UNAVAILABLE;
1777
2046
goto end;
1778
2047
} else {
1794
2063
}
1795
2064
1796
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2066
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2067
exitcode = EX_UNAVAILABLE;
1799
2068
goto end;
1800
2069
} else {
1810
2079
/* (Mainly meant for debugging) */
1811
2080
char *address = strrchr(connect_to, ':');
1812
2081
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2082
fprintf_plus(stderr, "No colon in address\n");
1814
2083
exitcode = EX_USAGE;
1815
2084
goto end;
1816
2085
}
1824
2093
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
2095
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2096
fprintf_plus(stderr, "Bad port number\n");
1828
2097
exitcode = EX_USAGE;
1829
2098
goto end;
1830
2099
}
1860
2129
break;
1861
2130
}
1862
2131
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
1865
2134
}
1866
2135
sleep((int)retry_interval);
1867
2136
}
1869
2138
if (not quit_now){
1870
2139
exitcode = EXIT_SUCCESS;
1871
2140
}
1872
2141
1873
2142
goto end;
1874
2143
}
1875
2144
1897
2166
1898
2167
/* Check if creating the Avahi server object succeeded */
1899
2168
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
1902
2171
exitcode = EX_UNAVAILABLE;
1903
2172
goto end;
1904
2173
}
1912
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
2182
NULL, 0, browse_callback, NULL);
1914
2183
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
1917
2186
exitcode = EX_UNAVAILABLE;
1918
2187
goto end;
1919
2188
}
1925
2194
/* Run the main loop */
1926
2195
1927
2196
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2198
}
1930
2199
1931
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
2201
(int)(retry_interval * 1000));
1933
2202
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
(ret == 0) ? "successfully" : "with error");
1936
2205
}
1937
2206
1938
2207
end:
1939
2208
1940
2209
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2211
}
1943
2212
1944
2213
/* Cleanup things */
1960
2229
if(gpgme_initialized){
1961
2230
gpgme_release(mc.ctx);
1962
2231
}
1963
2232
1964
2233
/* Cleans up the circular linked list of Mandos servers the client
1965
2234
has seen */
1966
2235
if(mc.current_server != NULL){
1972
2241
}
1973
2242
}
1974
2243
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2248
{
1978
2249
errno = 0;
1979
2250
ret = seteuid(0);
1980
2251
if(ret == -1){
1981
2252
perror_plus("seteuid");
1982
2253
}
1983
if(geteuid() == 0){
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
1984
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
2258
if(ret == -1){
1986
2259
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
2260
} else if(network.ifr_flags & IFF_UP){
1988
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
2263
if(ret == -1){
1995
2268
if(ret == -1){
1996
2269
perror_plus("close");
1997
2270
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
2271
}
2005
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2006
2279
2007
2280
/* Removes the GPGME temp directory and all files inside */
2008
2281
if(tempdir_created){
2022
2295
}
2023
2296
ret = remove(fullname);
2024
2297
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2027
2300
}
2028
2301
free(fullname);
2029
2302
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0