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- Committer: teddy at bsnet
- Date: 2010-09-09 18:28:57 UTC
- mfrom: (237.3.1 mandos-makefile-warning)
- Revision ID: teddy@fukt.bsnet.se-20100909182857-fuq4l9zetww2fyxw
* Makefile: Merge branch adding warning messages to "run-*" targets.
- files added:
- dbus-mandos.conf
- 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
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(),
71
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
78
88
#ifdef __linux__
79
89
#include <sys/klog.h> /* klogctl() */
80
#endif
90
#endif /* __linux__ */
81
91
82
92
/* Avahi */
83
93
/* All Avahi types, constants and functions
117
127
static const char mandos_protocol_version[] = "1";
118
128
const char *argp_program_version = "mandos-client " VERSION;
119
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
120
132
121
133
/* Used for passing in values through the Avahi callback functions */
122
134
typedef struct {
129
141
gpgme_ctx_t ctx;
130
142
} mandos_context;
131
143
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
132
152
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
135
155
* "buffer_length" is how much is already used.
136
156
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
157
size_t incbuffer(char **buffer, size_t buffer_length,
138
158
size_t buffer_capacity){
139
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
149
169
/*
150
170
* Initialize GPGME.
151
171
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
172
static bool init_gpgme(const char *seckey,
153
173
const char *pubkey, const char *tempdir){
154
int ret;
155
174
gpgme_error_t rc;
156
175
gpgme_engine_info_t engine_info;
157
176
160
179
* Helper function to insert pub and seckey to the engine keyring.
161
180
*/
162
181
bool import_key(const char *filename){
182
int ret;
163
183
int fd;
164
184
gpgme_data_t pgp_data;
165
185
176
196
return false;
177
197
}
178
198
179
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
180
200
if(rc != GPG_ERR_NO_ERROR){
181
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
202
gpgme_strsource(rc), gpgme_strerror(rc));
192
212
}
193
213
194
214
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
215
fprintf(stderr, "Initializing GPGME\n");
196
216
}
197
217
198
218
/* Init GPGME */
225
245
}
226
246
227
247
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
229
249
if(rc != GPG_ERR_NO_ERROR){
230
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
251
gpgme_strsource(rc), gpgme_strerror(rc));
236
256
return false;
237
257
}
238
258
239
return true;
259
return true;
240
260
}
241
261
242
262
/*
243
263
* Decrypt OpenPGP data.
244
264
* Returns -1 on error
245
265
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
267
size_t crypto_size,
249
268
char **plaintext){
250
269
gpgme_data_t dh_crypto, dh_plain;
277
296
278
297
/* Decrypt data from the cryptotext data buffer to the plaintext
279
298
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
300
if(rc != GPG_ERR_NO_ERROR){
282
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
302
gpgme_strsource(rc), gpgme_strerror(rc));
284
303
plaintext_length = -1;
285
304
if(debug){
286
305
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
288
307
if(result == NULL){
289
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
309
} else {
297
316
}
298
317
gpgme_recipient_t recipient;
299
318
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
}
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
326
recipient = recipient->next;
310
327
}
311
328
}
312
329
}
326
343
327
344
*plaintext = NULL;
328
345
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
346
plaintext_capacity = incbuffer(plaintext,
330
347
(size_t)plaintext_length,
331
348
plaintext_capacity);
332
349
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
350
perror("incbuffer");
334
351
plaintext_length = -1;
335
352
goto decrypt_end;
336
353
}
382
399
fprintf(stderr, "GnuTLS: %s", string);
383
400
}
384
401
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
402
static int init_gnutls_global(const char *pubkeyfilename,
387
403
const char *seckeyfilename){
388
404
int ret;
389
405
407
423
}
408
424
409
425
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
411
427
if(ret != GNUTLS_E_SUCCESS){
412
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
429
from
425
441
}
426
442
427
443
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
429
445
GNUTLS_OPENPGP_FMT_BASE64);
430
446
if(ret != GNUTLS_E_SUCCESS){
431
447
fprintf(stderr,
437
453
}
438
454
439
455
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
441
457
if(ret != GNUTLS_E_SUCCESS){
442
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
459
" %s\n", safer_gnutls_strerror(ret));
444
460
goto globalfail;
445
461
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
463
if(ret != GNUTLS_E_SUCCESS){
448
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
465
safer_gnutls_strerror(ret));
450
466
goto globalfail;
451
467
}
452
468
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
470
455
471
return 0;
456
472
457
473
globalfail:
458
474
459
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
460
476
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
462
478
return -1;
463
479
}
464
480
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
467
482
int ret;
468
483
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
490
if(ret != GNUTLS_E_SUCCESS){
471
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
492
safer_gnutls_strerror(ret));
474
494
475
495
{
476
496
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
504
if(ret != GNUTLS_E_SUCCESS){
479
505
fprintf(stderr, "Syntax error at: %s\n", err);
480
506
fprintf(stderr, "GnuTLS error: %s\n",
484
510
}
485
511
}
486
512
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
521
if(ret != GNUTLS_E_SUCCESS){
490
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
523
safer_gnutls_strerror(ret));
494
526
}
495
527
496
528
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
530
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
532
502
533
return 0;
503
534
}
509
540
/* Called when a Mandos server is found */
510
541
static int start_mandos_communication(const char *ip, uint16_t port,
511
542
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
543
int af){
544
int ret, tcp_sd = -1;
514
545
ssize_t sret;
515
546
union {
516
547
struct sockaddr_in in;
517
548
struct sockaddr_in6 in6;
518
549
} to;
519
550
char *buffer = NULL;
520
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
521
552
size_t buffer_length = 0;
522
553
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
524
554
size_t written;
525
int retval = 0;
555
int retval = -1;
526
556
gnutls_session_t session;
527
557
int pf; /* Protocol family */
528
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
529
566
switch(af){
530
567
case AF_INET6:
531
568
pf = PF_INET6;
535
572
break;
536
573
default:
537
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
538
576
return -1;
539
577
}
540
578
541
ret = init_gnutls_session(mc, &session);
579
ret = init_gnutls_session(&session);
542
580
if(ret != 0){
543
581
return -1;
544
582
}
550
588
551
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
590
if(tcp_sd < 0){
591
int e = errno;
553
592
perror("socket");
554
return -1;
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
555
600
}
556
601
557
602
memset(&to, 0, sizeof(to));
558
603
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
604
to.in6.sin6_family = (sa_family_t)af;
560
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
606
} else { /* IPv4 */
562
607
to.in.sin_family = (sa_family_t)af;
563
608
ret = inet_pton(af, ip, &to.in.sin_addr);
564
609
}
565
610
if(ret < 0 ){
611
int e = errno;
566
612
perror("inet_pton");
567
return -1;
613
errno = e;
614
goto mandos_end;
568
615
}
569
616
if(ret == 0){
617
int e = errno;
570
618
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
619
errno = e;
620
goto mandos_end;
572
621
}
573
622
if(af == AF_INET6){
574
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
630
if(if_index == AVAHI_IF_UNSPEC){
582
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
632
" without a network interface\n");
584
return -1;
633
errno = EINVAL;
634
goto mandos_end;
585
635
}
586
636
/* Set the network interface number as scope */
587
637
to.in6.sin6_scope_id = (uint32_t)if_index;
592
642
-Wunreachable-code */
593
643
}
594
644
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
595
650
if(debug){
596
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
652
char interface[IF_NAMESIZE];
624
679
}
625
680
}
626
681
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
627
687
if(af == AF_INET6){
628
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
689
} else {
630
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
691
}
632
692
if(ret < 0){
693
int e = errno;
633
694
perror("connect");
634
return -1;
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
635
702
}
636
703
637
704
const char *out = mandos_protocol_version;
641
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
642
709
out_size - written));
643
710
if(ret == -1){
711
int e = errno;
644
712
perror("write");
645
retval = -1;
713
errno = e;
646
714
goto mandos_end;
647
715
}
648
716
written += (size_t)ret;
656
724
break;
657
725
}
658
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
659
732
}
660
733
661
734
if(debug){
662
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
736
}
664
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
665
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
744
667
do{
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
668
751
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
669
756
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
757
671
758
if(ret != GNUTLS_E_SUCCESS){
673
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
674
761
gnutls_perror(ret);
675
762
}
676
retval = -1;
763
errno = EPROTO;
677
764
goto mandos_end;
678
765
}
679
766
685
772
}
686
773
687
774
while(true){
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
buffer_capacity = incbuffer(&buffer, buffer_length,
689
782
buffer_capacity);
690
783
if(buffer_capacity == 0){
691
perror("adjustbuffer");
692
retval = -1;
784
int e = errno;
785
perror("incbuffer");
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
693
792
goto mandos_end;
694
793
}
695
794
704
803
case GNUTLS_E_AGAIN:
705
804
break;
706
805
case GNUTLS_E_REHANDSHAKE:
707
do{
806
do {
708
807
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
709
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
814
if(ret < 0){
711
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
712
816
gnutls_perror(ret);
713
retval = -1;
817
errno = EPROTO;
714
818
goto mandos_end;
715
819
}
716
820
break;
717
821
default:
718
822
fprintf(stderr, "Unknown error while reading data from"
719
823
" encrypted session with Mandos server\n");
720
retval = -1;
721
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
722
826
goto mandos_end;
723
827
}
724
828
} else {
730
834
fprintf(stderr, "Closing TLS session\n");
731
835
}
732
836
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
837
if(quit_now){
838
errno = EINTR;
839
goto mandos_end;
840
}
841
842
do {
843
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
849
735
850
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
851
ssize_t decrypted_buffer_size;
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
853
buffer_length,
738
854
&decrypted_buffer);
739
855
if(decrypted_buffer_size >= 0){
856
740
857
written = 0;
741
858
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
742
864
ret = (int)fwrite(decrypted_buffer + written, 1,
743
865
(size_t)decrypted_buffer_size - written,
744
866
stdout);
745
867
if(ret == 0 and ferror(stdout)){
868
int e = errno;
746
869
if(debug){
747
870
fprintf(stderr, "Error writing encrypted data: %s\n",
748
871
strerror(errno));
749
872
}
750
retval = -1;
751
break;
873
errno = e;
874
goto mandos_end;
752
875
}
753
876
written += (size_t)ret;
754
877
}
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
878
retval = 0;
758
879
}
759
} else {
760
retval = -1;
761
880
}
762
881
763
882
/* Shutdown procedure */
764
883
765
884
mandos_end:
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
885
{
886
int e = errno;
887
free(decrypted_buffer);
888
free(buffer);
889
if(tcp_sd >= 0){
890
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
891
}
892
if(ret == -1){
893
if(e == 0){
894
e = errno;
895
}
896
perror("close");
897
}
898
gnutls_deinit(session);
899
if(quit_now){
900
e = EINTR;
901
retval = -1;
902
}
903
errno = e;
770
904
}
771
gnutls_deinit(session);
772
905
return retval;
773
906
}
774
907
785
918
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
920
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
921
AVAHI_GCC_UNUSED void* userdata){
790
922
assert(r);
791
923
792
924
/* Called whenever a service has been resolved successfully or
793
925
timed out */
794
926
927
if(quit_now){
928
return;
929
}
930
795
931
switch(event){
796
932
default:
797
933
case AVAHI_RESOLVER_FAILURE:
798
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
936
avahi_strerror(avahi_server_errno(mc.server)));
801
937
break;
802
938
803
939
case AVAHI_RESOLVER_FOUND:
809
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
946
ip, (intmax_t)interface, port);
811
947
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
948
int ret = start_mandos_communication(ip, port, interface,
813
949
avahi_proto_to_af(proto));
814
950
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
951
avahi_simple_poll_quit(mc.simple_poll);
816
952
}
817
953
}
818
954
}
828
964
const char *domain,
829
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
966
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
967
AVAHI_GCC_UNUSED void* userdata){
833
968
assert(b);
834
969
835
970
/* Called whenever a new services becomes available on the LAN or
836
971
is removed from the LAN */
837
972
973
if(quit_now){
974
return;
975
}
976
838
977
switch(event){
839
978
default:
840
979
case AVAHI_BROWSER_FAILURE:
841
980
842
981
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
845
984
return;
846
985
847
986
case AVAHI_BROWSER_NEW:
850
989
the callback function is called the Avahi server will free the
851
990
resolver for us. */
852
991
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
857
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
996
name, avahi_strerror(avahi_server_errno(mc.server)));
859
997
break;
860
998
861
999
case AVAHI_BROWSER_REMOVE:
870
1008
}
871
1009
}
872
1010
1011
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
1013
if(quit_now){
1014
return;
1015
}
1016
quit_now = 1;
1017
signal_received = sig;
1018
int old_errno = errno;
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1021
}
1022
errno = old_errno;
1023
}
1024
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1118
}
1119
873
1120
int main(int argc, char *argv[]){
874
1121
AvahiSServiceBrowser *sb = NULL;
875
1122
int error;
876
1123
int ret;
877
1124
intmax_t tmpmax;
878
int numchars;
1125
char *tmp;
879
1126
int exitcode = EXIT_SUCCESS;
880
const char *interface = "eth0";
1127
const char *interface = "";
881
1128
struct ifreq network;
882
int sd;
1129
int sd = -1;
1130
bool take_down_interface = false;
883
1131
uid_t uid;
884
1132
gid_t gid;
885
char *connect_to = NULL;
886
1133
char tempdir[] = "/tmp/mandosXXXXXX";
887
1134
bool tempdir_created = false;
888
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
889
1136
const char *seckey = PATHDIR "/" SECKEY;
890
1137
const char *pubkey = PATHDIR "/" PUBKEY;
891
1138
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
1139
bool gnutls_initialized = false;
896
1140
bool gpgme_initialized = false;
897
double delay = 2.5;
1141
float delay = 2.5f;
1142
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1145
1146
uid = getuid();
1147
gid = getgid();
1148
1149
/* Lower any group privileges we might have, just to be safe */
1150
errno = 0;
1151
ret = setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
/* Lower user privileges (temporarily) */
1157
errno = 0;
1158
ret = seteuid(uid);
1159
if(ret == -1){
1160
perror("seteuid");
1161
}
1162
1163
if(quit_now){
1164
goto end;
1165
}
898
1166
899
1167
{
900
1168
struct argp_option options[] = {
930
1198
.arg = "SECONDS",
931
1199
.doc = "Maximum delay to wait for interface startup",
932
1200
.group = 2 },
1201
/*
1202
* These reproduce what we would get without ARGP_NO_HELP
1203
*/
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
933
1210
{ .name = NULL }
934
1211
};
935
1212
936
1213
error_t parse_opt(int key, char *arg,
937
1214
struct argp_state *state){
1215
errno = 0;
938
1216
switch(key){
939
1217
case 128: /* --debug */
940
1218
debug = true;
952
1230
pubkey = arg;
953
1231
break;
954
1232
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'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1233
errno = 0;
1234
tmpmax = strtoimax(arg, &tmp, 10);
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
960
1238
}
961
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
962
1240
break;
964
1242
mc.priority = arg;
965
1243
break;
966
1244
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
1245
errno = 0;
1246
delay = strtof(arg, &tmp);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
971
1249
}
972
1250
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1251
/*
1252
* These reproduce what we would get without ARGP_NO_HELP
1253
*/
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
976
1264
break;
977
1265
default:
978
1266
return ARGP_ERR_UNKNOWN;
979
1267
}
980
return 0;
1268
return errno;
981
1269
}
982
1270
983
1271
struct argp argp = { .options = options, .parser = parse_opt,
984
1272
.args_doc = "",
985
1273
.doc = "Mandos client -- Get and decrypt"
986
1274
" passwords from a Mandos server" };
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1277
switch(ret){
1278
case 0:
1279
break;
1280
case ENOMEM:
1281
default:
1282
errno = ret;
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1285
goto end;
1286
case EINVAL:
1287
exitcode = EX_USAGE;
1288
goto end;
1289
}
1290
}
1291
1292
if(not debug){
1293
avahi_set_log_function(empty_log);
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
990
1316
exitcode = EXIT_FAILURE;
991
1317
goto end;
992
1318
}
993
1319
}
994
1320
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
from the signal handler */
1323
/* Initialize the pseudo-RNG for Avahi */
1324
srand((unsigned int) time(NULL));
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1328
exitcode = EX_UNAVAILABLE;
1329
goto end;
1330
}
1331
1332
sigemptyset(&sigterm_action.sa_mask);
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
if(ret == -1){
1335
perror("sigaddset");
1336
exitcode = EX_OSERR;
1337
goto end;
1338
}
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
if(ret == -1){
1341
perror("sigaddset");
1342
exitcode = EX_OSERR;
1343
goto end;
1344
}
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
if(ret == -1){
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1354
*/
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
if(ret == -1){
1357
perror("sigaction");
1358
return EX_OSERR;
1359
}
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
if(ret == -1){
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1365
goto end;
1366
}
1367
}
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
if(ret == -1){
1370
perror("sigaction");
1371
return EX_OSERR;
1372
}
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
if(ret == -1){
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1378
goto end;
1379
}
1380
}
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
if(ret == -1){
1383
perror("sigaction");
1384
return EX_OSERR;
1385
}
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
if(ret == -1){
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1391
goto end;
1392
}
1393
}
1394
995
1395
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
997
1415
#ifdef __linux__
998
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1417
messages about the network interface to mess up the prompt */
1000
1418
ret = klogctl(8, NULL, 5);
1001
1419
bool restore_loglevel = true;
1002
1420
if(ret == -1){
1003
1421
restore_loglevel = false;
1004
1422
perror("klogctl");
1005
1423
}
1006
#endif
1424
#endif /* __linux__ */
1007
1425
1008
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
1427
if(sd < 0){
1010
1428
perror("socket");
1011
exitcode = EXIT_FAILURE;
1429
exitcode = EX_OSERR;
1012
1430
#ifdef __linux__
1013
1431
if(restore_loglevel){
1014
1432
ret = klogctl(7, NULL, 0);
1016
1434
perror("klogctl");
1017
1435
}
1018
1436
}
1019
#endif
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1020
1444
goto end;
1021
1445
}
1022
1446
strcpy(network.ifr_name, interface);
1030
1454
perror("klogctl");
1031
1455
}
1032
1456
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1035
1465
goto end;
1036
1466
}
1037
1467
if((network.ifr_flags & IFF_UP) == 0){
1038
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1039
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
1471
if(ret == -1){
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1043
1475
#ifdef __linux__
1044
1476
if(restore_loglevel){
1045
1477
ret = klogctl(7, NULL, 0);
1047
1479
perror("klogctl");
1048
1480
}
1049
1481
}
1050
#endif
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1051
1489
goto end;
1052
1490
}
1053
1491
}
1065
1503
perror("nanosleep");
1066
1504
}
1067
1505
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1071
1512
}
1072
1513
#ifdef __linux__
1073
1514
if(restore_loglevel){
1077
1518
perror("klogctl");
1078
1519
}
1079
1520
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
1537
}
1538
1539
if(quit_now){
1540
goto end;
1541
}
1542
1543
ret = init_gnutls_global(pubkey, seckey);
1098
1544
if(ret == -1){
1099
1545
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1546
exitcode = EX_UNAVAILABLE;
1101
1547
goto end;
1102
1548
} else {
1103
1549
gnutls_initialized = true;
1104
1550
}
1105
1551
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1106
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1107
1559
perror("mkdtemp");
1108
1560
goto end;
1109
1561
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1562
1563
if(quit_now){
1564
goto end;
1565
}
1566
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1113
1568
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
1569
exitcode = EX_UNAVAILABLE;
1115
1570
goto end;
1116
1571
} else {
1117
1572
gpgme_initialized = true;
1118
1573
}
1119
1574
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
}
1575
if(quit_now){
1576
goto end;
1127
1577
}
1128
1578
1129
1579
if(connect_to != NULL){
1132
1582
char *address = strrchr(connect_to, ':');
1133
1583
if(address == NULL){
1134
1584
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1138
1593
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'){
1594
errno = 0;
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
or tmpmax != (uint16_t)tmpmax){
1142
1598
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1146
1607
port = (uint16_t)tmpmax;
1147
1608
*address = '\0';
1148
1609
address = connect_to;
1153
1614
} else {
1154
1615
af = AF_INET;
1155
1616
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1622
ret = start_mandos_communication(address, port, if_index, af);
1158
1623
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1160
1643
} else {
1161
1644
exitcode = EXIT_SUCCESS;
1162
1645
}
1163
1646
goto end;
1164
1647
}
1165
1648
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;
1649
if(quit_now){
1178
1650
goto end;
1179
1651
}
1180
1652
1200
1672
if(mc.server == NULL){
1201
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
1674
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1204
1680
goto end;
1205
1681
}
1206
1682
1207
1683
/* Create the Avahi service browser */
1208
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1211
1687
if(sb == NULL){
1212
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1213
1689
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1215
1695
goto end;
1216
1696
}
1217
1697
1249
1729
gpgme_release(mc.ctx);
1250
1730
}
1251
1731
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1252
1764
/* Removes the temp directory used by GPGME */
1253
1765
if(tempdir_created){
1254
1766
DIR *d;
1293
1805
}
1294
1806
}
1295
1807
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1296
1827
return exitcode;
1297
1828
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0