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- Committer: Teddy Hogeborn
- Date: 2009-09-08 04:41:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908044137-4cxubotvn4etoxxl
* plugins.d/mandos-client.c (main): Bug fix: Check result of setgid().
Bug fix: If taking down network
interface, do not drop privileges
completely; save them and reassert
privileges when needed.
Bug fix: If taking down network
interface, do not drop privileges
completely; save them and reassert
privileges when needed.
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
47
srand(), strtof() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
65
#include <errno.h> /* perror(), errno */
62
66
#include <time.h> /* nanosleep(), time() */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
71
75
setgid() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
78
86
#ifdef __linux__
79
87
#include <sys/klog.h> /* klogctl() */
80
#endif
88
#endif /* __linux__ */
81
89
82
90
/* Avahi */
83
91
/* All Avahi types, constants and functions
129
137
gpgme_ctx_t ctx;
130
138
} mandos_context;
131
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
132
145
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
135
148
* "buffer_length" is how much is already used.
136
149
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
138
151
size_t buffer_capacity){
139
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
149
162
/*
150
163
* Initialize GPGME.
151
164
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
153
166
const char *pubkey, const char *tempdir){
154
int ret;
155
167
gpgme_error_t rc;
156
168
gpgme_engine_info_t engine_info;
157
169
160
172
* Helper function to insert pub and seckey to the engine keyring.
161
173
*/
162
174
bool import_key(const char *filename){
175
int ret;
163
176
int fd;
164
177
gpgme_data_t pgp_data;
165
178
176
189
return false;
177
190
}
178
191
179
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
180
193
if(rc != GPG_ERR_NO_ERROR){
181
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
195
gpgme_strsource(rc), gpgme_strerror(rc));
192
205
}
193
206
194
207
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
208
fprintf(stderr, "Initializing GPGME\n");
196
209
}
197
210
198
211
/* Init GPGME */
225
238
}
226
239
227
240
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
229
242
if(rc != GPG_ERR_NO_ERROR){
230
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
244
gpgme_strsource(rc), gpgme_strerror(rc));
236
249
return false;
237
250
}
238
251
239
return true;
252
return true;
240
253
}
241
254
242
255
/*
243
256
* Decrypt OpenPGP data.
244
257
* Returns -1 on error
245
258
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
260
size_t crypto_size,
249
261
char **plaintext){
250
262
gpgme_data_t dh_crypto, dh_plain;
277
289
278
290
/* Decrypt data from the cryptotext data buffer to the plaintext
279
291
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
293
if(rc != GPG_ERR_NO_ERROR){
282
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
295
gpgme_strsource(rc), gpgme_strerror(rc));
284
296
plaintext_length = -1;
285
297
if(debug){
286
298
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
288
300
if(result == NULL){
289
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
302
} else {
297
309
}
298
310
gpgme_recipient_t recipient;
299
311
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
310
320
}
311
321
}
312
322
}
326
336
327
337
*plaintext = NULL;
328
338
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
330
340
(size_t)plaintext_length,
331
341
plaintext_capacity);
332
342
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
343
perror("incbuffer");
334
344
plaintext_length = -1;
335
345
goto decrypt_end;
336
346
}
382
392
fprintf(stderr, "GnuTLS: %s", string);
383
393
}
384
394
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
387
396
const char *seckeyfilename){
388
397
int ret;
389
398
407
416
}
408
417
409
418
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
411
420
if(ret != GNUTLS_E_SUCCESS){
412
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
422
from
425
434
}
426
435
427
436
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
429
438
GNUTLS_OPENPGP_FMT_BASE64);
430
439
if(ret != GNUTLS_E_SUCCESS){
431
440
fprintf(stderr,
437
446
}
438
447
439
448
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
441
450
if(ret != GNUTLS_E_SUCCESS){
442
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
452
" %s\n", safer_gnutls_strerror(ret));
444
453
goto globalfail;
445
454
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
456
if(ret != GNUTLS_E_SUCCESS){
448
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
458
safer_gnutls_strerror(ret));
450
459
goto globalfail;
451
460
}
452
461
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
463
455
464
return 0;
456
465
457
466
globalfail:
458
467
459
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
460
469
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
462
471
return -1;
463
472
}
464
473
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
467
475
int ret;
468
476
/* GnuTLS session creation */
469
477
ret = gnutls_init(session, GNUTLS_SERVER);
474
482
475
483
{
476
484
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
478
486
if(ret != GNUTLS_E_SUCCESS){
479
487
fprintf(stderr, "Syntax error at: %s\n", err);
480
488
fprintf(stderr, "GnuTLS error: %s\n",
485
493
}
486
494
487
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
496
mc.cred);
489
497
if(ret != GNUTLS_E_SUCCESS){
490
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
499
safer_gnutls_strerror(ret));
497
505
gnutls_certificate_server_set_request(*session,
498
506
GNUTLS_CERT_IGNORE);
499
507
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
509
502
510
return 0;
503
511
}
506
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
507
515
__attribute__((unused)) const char *txt){}
508
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
509
520
/* Called when a Mandos server is found */
510
521
static int start_mandos_communication(const char *ip, uint16_t port,
511
522
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
523
int af){
524
int ret, tcp_sd = -1;
514
525
ssize_t sret;
515
526
union {
516
527
struct sockaddr_in in;
520
531
char *decrypted_buffer;
521
532
size_t buffer_length = 0;
522
533
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
524
534
size_t written;
525
535
int retval = 0;
526
536
gnutls_session_t session;
527
537
int pf; /* Protocol family */
528
538
539
if(quit_now){
540
return -1;
541
}
542
529
543
switch(af){
530
544
case AF_INET6:
531
545
pf = PF_INET6;
538
552
return -1;
539
553
}
540
554
541
ret = init_gnutls_session(mc, &session);
555
ret = init_gnutls_session(&session);
542
556
if(ret != 0){
543
557
return -1;
544
558
}
551
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
566
if(tcp_sd < 0){
553
567
perror("socket");
554
return -1;
568
retval = -1;
569
goto mandos_end;
570
}
571
572
if(quit_now){
573
goto mandos_end;
555
574
}
556
575
557
576
memset(&to, 0, sizeof(to));
558
577
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
578
to.in6.sin6_family = (sa_family_t)af;
560
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
580
} else { /* IPv4 */
562
581
to.in.sin_family = (sa_family_t)af;
564
583
}
565
584
if(ret < 0 ){
566
585
perror("inet_pton");
567
return -1;
586
retval = -1;
587
goto mandos_end;
568
588
}
569
589
if(ret == 0){
570
590
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
591
retval = -1;
592
goto mandos_end;
572
593
}
573
594
if(af == AF_INET6){
574
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
602
if(if_index == AVAHI_IF_UNSPEC){
582
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
604
" without a network interface\n");
584
return -1;
605
retval = -1;
606
goto mandos_end;
585
607
}
586
608
/* Set the network interface number as scope */
587
609
to.in6.sin6_scope_id = (uint32_t)if_index;
592
614
-Wunreachable-code */
593
615
}
594
616
617
if(quit_now){
618
goto mandos_end;
619
}
620
595
621
if(debug){
596
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
623
char interface[IF_NAMESIZE];
624
650
}
625
651
}
626
652
653
if(quit_now){
654
goto mandos_end;
655
}
656
627
657
if(af == AF_INET6){
628
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
659
} else {
631
661
}
632
662
if(ret < 0){
633
663
perror("connect");
634
return -1;
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
635
670
}
636
671
637
672
const char *out = mandos_protocol_version;
656
691
break;
657
692
}
658
693
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
659
698
}
660
699
661
700
if(debug){
662
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
702
}
664
703
704
if(quit_now){
705
goto mandos_end;
706
}
707
665
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
709
667
do{
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
668
715
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
669
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
720
671
721
if(ret != GNUTLS_E_SUCCESS){
685
735
}
686
736
687
737
while(true){
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
689
744
buffer_capacity);
690
745
if(buffer_capacity == 0){
691
perror("adjustbuffer");
746
perror("incbuffer");
692
747
retval = -1;
693
748
goto mandos_end;
694
749
}
695
750
751
if(quit_now){
752
goto mandos_end;
753
}
754
696
755
sret = gnutls_record_recv(session, buffer+buffer_length,
697
756
BUFFER_SIZE);
698
757
if(sret == 0){
704
763
case GNUTLS_E_AGAIN:
705
764
break;
706
765
case GNUTLS_E_REHANDSHAKE:
707
do{
766
do {
708
767
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
709
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
773
if(ret < 0){
711
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
730
793
fprintf(stderr, "Closing TLS session\n");
731
794
}
732
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
733
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
734
801
802
if(quit_now){
803
goto mandos_end;
804
}
805
735
806
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
807
ssize_t decrypted_buffer_size;
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
809
buffer_length,
738
810
&decrypted_buffer);
739
811
if(decrypted_buffer_size >= 0){
812
740
813
written = 0;
741
814
while(written < (size_t) decrypted_buffer_size){
815
if(quit_now){
816
goto mandos_end;
817
}
818
742
819
ret = (int)fwrite(decrypted_buffer + written, 1,
743
820
(size_t)decrypted_buffer_size - written,
744
821
stdout);
764
841
765
842
mandos_end:
766
843
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
768
847
if(ret == -1){
769
848
perror("close");
770
849
}
771
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
772
854
return retval;
773
855
}
774
856
785
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
869
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
870
AVAHI_GCC_UNUSED void* userdata){
790
871
assert(r);
791
872
792
873
/* Called whenever a service has been resolved successfully or
793
874
timed out */
794
875
876
if(quit_now){
877
return;
878
}
879
795
880
switch(event){
796
881
default:
797
882
case AVAHI_RESOLVER_FAILURE:
798
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
885
avahi_strerror(avahi_server_errno(mc.server)));
801
886
break;
802
887
803
888
case AVAHI_RESOLVER_FOUND:
809
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
895
ip, (intmax_t)interface, port);
811
896
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
897
int ret = start_mandos_communication(ip, port, interface,
813
898
avahi_proto_to_af(proto));
814
899
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
900
avahi_simple_poll_quit(mc.simple_poll);
816
901
}
817
902
}
818
903
}
828
913
const char *domain,
829
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
915
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
916
AVAHI_GCC_UNUSED void* userdata){
833
917
assert(b);
834
918
835
919
/* Called whenever a new services becomes available on the LAN or
836
920
is removed from the LAN */
837
921
922
if(quit_now){
923
return;
924
}
925
838
926
switch(event){
839
927
default:
840
928
case AVAHI_BROWSER_FAILURE:
841
929
842
930
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
845
933
return;
846
934
847
935
case AVAHI_BROWSER_NEW:
850
938
the callback function is called the Avahi server will free the
851
939
resolver for us. */
852
940
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
857
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
945
name, avahi_strerror(avahi_server_errno(mc.server)));
859
946
break;
860
947
861
948
case AVAHI_BROWSER_REMOVE:
870
957
}
871
958
}
872
959
960
/* stop main loop after sigterm has been called */
961
static void handle_sigterm(int sig){
962
if(quit_now){
963
return;
964
}
965
quit_now = 1;
966
signal_received = sig;
967
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
972
}
973
873
974
int main(int argc, char *argv[]){
874
975
AvahiSServiceBrowser *sb = NULL;
875
976
int error;
876
977
int ret;
877
978
intmax_t tmpmax;
878
int numchars;
979
char *tmp;
879
980
int exitcode = EXIT_SUCCESS;
880
981
const char *interface = "eth0";
881
982
struct ifreq network;
882
int sd;
983
int sd = -1;
984
bool take_down_interface = false;
883
985
uid_t uid;
884
986
gid_t gid;
885
987
char *connect_to = NULL;
889
991
const char *seckey = PATHDIR "/" SECKEY;
890
992
const char *pubkey = PATHDIR "/" PUBKEY;
891
993
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
994
bool gnutls_initialized = false;
896
995
bool gpgme_initialized = false;
897
double delay = 2.5;
996
float delay = 2.5f;
997
998
struct sigaction old_sigterm_action;
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
898
1000
899
1001
{
900
1002
struct argp_option options[] = {
952
1054
pubkey = arg;
953
1055
break;
954
1056
case 129: /* --dh-bits */
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
1057
errno = 0;
1058
tmpmax = strtoimax(arg, &tmp, 10);
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
958
1061
fprintf(stderr, "Bad number of DH bits\n");
959
1062
exit(EXIT_FAILURE);
960
1063
}
964
1067
mc.priority = arg;
965
1068
break;
966
1069
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
1070
errno = 0;
1071
delay = strtof(arg, &tmp);
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
969
1073
fprintf(stderr, "Bad delay\n");
970
1074
exit(EXIT_FAILURE);
971
1075
}
992
1096
}
993
1097
}
994
1098
1099
if(not debug){
1100
avahi_set_log_function(empty_log);
1101
}
1102
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
from the signal handler */
1105
/* Initialize the pseudo-RNG for Avahi */
1106
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
}
1113
1114
sigemptyset(&sigterm_action.sa_mask);
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1131
goto end;
1132
}
1133
/* Need to check if the handler is SIG_IGN before handling:
1134
| [[info:libc:Initial Signal Actions]] |
1135
| [[info:libc:Basic Signal Handling]] |
1136
*/
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1141
}
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1154
}
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1160
goto end;
1161
}
1162
}
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
995
1177
/* If the interface is down, bring it up */
996
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1180
if(if_index == 0){
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
997
1190
#ifdef __linux__
998
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
1192
messages to mess up the prompt */
1003
1196
restore_loglevel = false;
1004
1197
perror("klogctl");
1005
1198
}
1006
#endif
1199
#endif /* __linux__ */
1007
1200
1008
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
1202
if(sd < 0){
1016
1209
perror("klogctl");
1017
1210
}
1018
1211
}
1019
#endif
1212
#endif /* __linux__ */
1020
1213
goto end;
1021
1214
}
1022
1215
strcpy(network.ifr_name, interface);
1030
1223
perror("klogctl");
1031
1224
}
1032
1225
}
1033
#endif
1226
#endif /* __linux__ */
1034
1227
exitcode = EXIT_FAILURE;
1035
1228
goto end;
1036
1229
}
1037
1230
if((network.ifr_flags & IFF_UP) == 0){
1038
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1039
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
1234
if(ret == -1){
1235
take_down_interface = false;
1041
1236
perror("ioctl SIOCSIFFLAGS");
1042
1237
exitcode = EXIT_FAILURE;
1043
1238
#ifdef __linux__
1047
1242
perror("klogctl");
1048
1243
}
1049
1244
}
1050
#endif
1245
#endif /* __linux__ */
1051
1246
goto end;
1052
1247
}
1053
1248
}
1065
1260
perror("nanosleep");
1066
1261
}
1067
1262
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1071
1269
}
1072
1270
#ifdef __linux__
1073
1271
if(restore_loglevel){
1077
1275
perror("klogctl");
1078
1276
}
1079
1277
}
1080
#endif
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1081
1283
}
1082
1284
1083
1285
uid = getuid();
1084
1286
gid = getgid();
1085
1287
1288
/* Drop any group privileges we might have, just to be safe */
1086
1289
errno = 0;
1087
setgid(gid);
1290
ret = setgid(gid);
1088
1291
if(ret == -1){
1089
1292
perror("setgid");
1090
1293
}
1091
1294
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
1300
ret = seteuid(uid);
1301
if(ret == -1){
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
1309
}
1310
}
1311
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
ret = init_gnutls_global(pubkey, seckey);
1098
1317
if(ret == -1){
1099
1318
fprintf(stderr, "init_gnutls_global failed\n");
1100
1319
exitcode = EXIT_FAILURE;
1103
1322
gnutls_initialized = true;
1104
1323
}
1105
1324
1325
if(quit_now){
1326
goto end;
1327
}
1328
1329
tempdir_created = true;
1106
1330
if(mkdtemp(tempdir) == NULL){
1331
tempdir_created = false;
1107
1332
perror("mkdtemp");
1108
1333
goto end;
1109
1334
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1335
1336
if(quit_now){
1337
goto end;
1338
}
1339
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
1113
1341
fprintf(stderr, "init_gpgme failed\n");
1114
1342
exitcode = EXIT_FAILURE;
1115
1343
goto end;
1117
1345
gpgme_initialized = true;
1118
1346
}
1119
1347
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1348
if(quit_now){
1349
goto end;
1127
1350
}
1128
1351
1129
1352
if(connect_to != NULL){
1135
1358
exitcode = EXIT_FAILURE;
1136
1359
goto end;
1137
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1138
1366
uint16_t port;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1367
errno = 0;
1368
tmpmax = strtoimax(address+1, &tmp, 10);
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1370
or tmpmax != (uint16_t)tmpmax){
1142
1371
fprintf(stderr, "Bad port number\n");
1143
1372
exitcode = EXIT_FAILURE;
1144
1373
goto end;
1145
1374
}
1375
1376
if(quit_now){
1377
goto end;
1378
}
1379
1146
1380
port = (uint16_t)tmpmax;
1147
1381
*address = '\0';
1148
1382
address = connect_to;
1153
1387
} else {
1154
1388
af = AF_INET;
1155
1389
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1390
1391
if(quit_now){
1392
goto end;
1393
}
1394
1395
ret = start_mandos_communication(address, port, if_index, af);
1158
1396
if(ret < 0){
1159
1397
exitcode = EXIT_FAILURE;
1160
1398
} else {
1163
1401
goto end;
1164
1402
}
1165
1403
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
1404
if(quit_now){
1178
1405
goto end;
1179
1406
}
1180
1407
1204
1431
goto end;
1205
1432
}
1206
1433
1434
if(quit_now){
1435
goto end;
1436
}
1437
1207
1438
/* Create the Avahi service browser */
1208
1439
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1441
NULL, 0, browse_callback, NULL);
1211
1442
if(sb == NULL){
1212
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1213
1444
avahi_strerror(avahi_server_errno(mc.server)));
1215
1446
goto end;
1216
1447
}
1217
1448
1449
if(quit_now){
1450
goto end;
1451
}
1452
1218
1453
/* Run the main loop */
1219
1454
1220
1455
if(debug){
1249
1484
gpgme_release(mc.ctx);
1250
1485
}
1251
1486
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
1494
}
1495
if(geteuid() == 0){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1502
if(ret == -1){
1503
perror("ioctl SIOCSIFFLAGS");
1504
}
1505
}
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1507
if(ret == -1){
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
1515
}
1516
}
1517
}
1518
1252
1519
/* Removes the temp directory used by GPGME */
1253
1520
if(tempdir_created){
1254
1521
DIR *d;
1293
1560
}
1294
1561
}
1295
1562
1563
if(quit_now){
1564
sigemptyset(&old_sigterm_action.sa_mask);
1565
old_sigterm_action.sa_handler = SIG_DFL;
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1567
if(ret == -1){
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
1571
}
1572
1296
1573
return exitcode;
1297
1574
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0