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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:13:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209021358-6nrlc91oi08hn5hb
* initramfs-tools-hook: Whitespace change only.
- 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
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
61
#include <errno.h> /* perror(), errno */
66
62
#include <time.h> /* nanosleep(), time() */
71
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
68
*/
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
70
getuid(), getgid(), setuid(),
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
73
#include <iso646.h> /* not, or, and */
78
74
#include <argp.h> /* struct argp_option, error_t, struct
79
75
argp_state, struct argp,
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
78
#ifdef __linux__
87
79
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
80
#endif
89
81
90
82
/* Avahi */
91
83
/* All Avahi types, constants and functions
125
117
static const char mandos_protocol_version[] = "1";
126
118
const char *argp_program_version = "mandos-client " VERSION;
127
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
static const char sys_class_net[] = "/sys/class/net";
129
char *connect_to = NULL;
130
120
131
121
/* Used for passing in values through the Avahi callback functions */
132
122
typedef struct {
139
129
gpgme_ctx_t ctx;
140
130
} mandos_context;
141
131
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
150
132
/*
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
153
135
* "buffer_length" is how much is already used.
154
136
*/
155
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
156
138
size_t buffer_capacity){
157
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
167
149
/*
168
150
* Initialize GPGME.
169
151
*/
170
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
171
153
const char *pubkey, const char *tempdir){
154
int ret;
172
155
gpgme_error_t rc;
173
156
gpgme_engine_info_t engine_info;
174
157
177
160
* Helper function to insert pub and seckey to the engine keyring.
178
161
*/
179
162
bool import_key(const char *filename){
180
int ret;
181
163
int fd;
182
164
gpgme_data_t pgp_data;
183
165
194
176
return false;
195
177
}
196
178
197
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
198
180
if(rc != GPG_ERR_NO_ERROR){
199
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
182
gpgme_strsource(rc), gpgme_strerror(rc));
210
192
}
211
193
212
194
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
214
196
}
215
197
216
198
/* Init GPGME */
243
225
}
244
226
245
227
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
247
229
if(rc != GPG_ERR_NO_ERROR){
248
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
231
gpgme_strsource(rc), gpgme_strerror(rc));
254
236
return false;
255
237
}
256
238
257
return true;
239
return true;
258
240
}
259
241
260
242
/*
261
243
* Decrypt OpenPGP data.
262
244
* Returns -1 on error
263
245
*/
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
265
248
size_t crypto_size,
266
249
char **plaintext){
267
250
gpgme_data_t dh_crypto, dh_plain;
294
277
295
278
/* Decrypt data from the cryptotext data buffer to the plaintext
296
279
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
281
if(rc != GPG_ERR_NO_ERROR){
299
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
283
gpgme_strsource(rc), gpgme_strerror(rc));
301
284
plaintext_length = -1;
302
285
if(debug){
303
286
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
305
288
if(result == NULL){
306
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
307
290
} else {
314
297
}
315
298
gpgme_recipient_t recipient;
316
299
recipient = result->recipients;
317
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
324
recipient = recipient->next;
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
}
325
310
}
326
311
}
327
312
}
341
326
342
327
*plaintext = NULL;
343
328
while(true){
344
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
345
330
(size_t)plaintext_length,
346
331
plaintext_capacity);
347
332
if(plaintext_capacity == 0){
348
perror("incbuffer");
333
perror("adjustbuffer");
349
334
plaintext_length = -1;
350
335
goto decrypt_end;
351
336
}
397
382
fprintf(stderr, "GnuTLS: %s", string);
398
383
}
399
384
400
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
401
387
const char *seckeyfilename){
402
388
int ret;
403
389
421
407
}
422
408
423
409
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
425
411
if(ret != GNUTLS_E_SUCCESS){
426
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
413
from
439
425
}
440
426
441
427
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
443
429
GNUTLS_OPENPGP_FMT_BASE64);
444
430
if(ret != GNUTLS_E_SUCCESS){
445
431
fprintf(stderr,
451
437
}
452
438
453
439
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
455
441
if(ret != GNUTLS_E_SUCCESS){
456
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
443
" %s\n", safer_gnutls_strerror(ret));
458
444
goto globalfail;
459
445
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
447
if(ret != GNUTLS_E_SUCCESS){
462
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
449
safer_gnutls_strerror(ret));
464
450
goto globalfail;
465
451
}
466
452
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
454
469
455
return 0;
470
456
471
457
globalfail:
472
458
473
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
474
460
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
476
462
return -1;
477
463
}
478
464
479
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
480
467
int ret;
481
468
/* GnuTLS session creation */
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
488
470
if(ret != GNUTLS_E_SUCCESS){
489
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
472
safer_gnutls_strerror(ret));
492
474
493
475
{
494
476
const char *err;
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
502
478
if(ret != GNUTLS_E_SUCCESS){
503
479
fprintf(stderr, "Syntax error at: %s\n", err);
504
480
fprintf(stderr, "GnuTLS error: %s\n",
508
484
}
509
485
}
510
486
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
519
489
if(ret != GNUTLS_E_SUCCESS){
520
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
491
safer_gnutls_strerror(ret));
524
494
}
525
495
526
496
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
528
499
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
501
531
502
return 0;
532
503
}
538
509
/* Called when a Mandos server is found */
539
510
static int start_mandos_communication(const char *ip, uint16_t port,
540
511
AvahiIfIndex if_index,
541
int af){
542
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
543
514
ssize_t sret;
544
515
union {
545
516
struct sockaddr_in in;
546
517
struct sockaddr_in6 in6;
547
518
} to;
548
519
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
550
521
size_t buffer_length = 0;
551
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
552
524
size_t written;
553
int retval = -1;
525
int retval = 0;
554
526
gnutls_session_t session;
555
527
int pf; /* Protocol family */
556
528
557
if(quit_now){
558
return -1;
559
}
560
561
529
switch(af){
562
530
case AF_INET6:
563
531
pf = PF_INET6;
570
538
return -1;
571
539
}
572
540
573
ret = init_gnutls_session(&session);
541
ret = init_gnutls_session(mc, &session);
574
542
if(ret != 0){
575
543
return -1;
576
544
}
583
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
552
if(tcp_sd < 0){
585
553
perror("socket");
586
goto mandos_end;
587
}
588
589
if(quit_now){
590
goto mandos_end;
554
return -1;
591
555
}
592
556
593
557
memset(&to, 0, sizeof(to));
594
558
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
559
to.in6.sin6_family = (uint16_t)af;
596
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
561
} else { /* IPv4 */
598
562
to.in.sin_family = (sa_family_t)af;
600
564
}
601
565
if(ret < 0 ){
602
566
perror("inet_pton");
603
goto mandos_end;
567
return -1;
604
568
}
605
569
if(ret == 0){
606
570
fprintf(stderr, "Bad address: %s\n", ip);
607
goto mandos_end;
571
return -1;
608
572
}
609
573
if(af == AF_INET6){
610
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
617
581
if(if_index == AVAHI_IF_UNSPEC){
618
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
583
" without a network interface\n");
620
goto mandos_end;
584
return -1;
621
585
}
622
586
/* Set the network interface number as scope */
623
587
to.in6.sin6_scope_id = (uint32_t)if_index;
628
592
-Wunreachable-code */
629
593
}
630
594
631
if(quit_now){
632
goto mandos_end;
633
}
634
635
595
if(debug){
636
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
597
char interface[IF_NAMESIZE];
664
624
}
665
625
}
666
626
667
if(quit_now){
668
goto mandos_end;
669
}
670
671
627
if(af == AF_INET6){
672
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
673
629
} else {
675
631
}
676
632
if(ret < 0){
677
633
perror("connect");
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
634
return -1;
683
635
}
684
636
685
637
const char *out = mandos_protocol_version;
690
642
out_size - written));
691
643
if(ret == -1){
692
644
perror("write");
645
retval = -1;
693
646
goto mandos_end;
694
647
}
695
648
written += (size_t)ret;
703
656
break;
704
657
}
705
658
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
710
659
}
711
660
712
661
if(debug){
713
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
714
663
}
715
664
716
if(quit_now){
717
goto mandos_end;
718
}
719
720
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
721
666
722
if(quit_now){
723
goto mandos_end;
724
}
725
726
do {
667
do{
727
668
ret = gnutls_handshake(session);
728
if(quit_now){
729
goto mandos_end;
730
}
731
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
732
670
733
671
if(ret != GNUTLS_E_SUCCESS){
735
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
736
674
gnutls_perror(ret);
737
675
}
676
retval = -1;
738
677
goto mandos_end;
739
678
}
740
679
746
685
}
747
686
748
687
while(true){
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
buffer_capacity = incbuffer(&buffer, buffer_length,
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
755
689
buffer_capacity);
756
690
if(buffer_capacity == 0){
757
perror("incbuffer");
758
goto mandos_end;
759
}
760
761
if(quit_now){
691
perror("adjustbuffer");
692
retval = -1;
762
693
goto mandos_end;
763
694
}
764
695
773
704
case GNUTLS_E_AGAIN:
774
705
break;
775
706
case GNUTLS_E_REHANDSHAKE:
776
do {
707
do{
777
708
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
782
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
783
710
if(ret < 0){
784
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
785
712
gnutls_perror(ret);
713
retval = -1;
786
714
goto mandos_end;
787
715
}
788
716
break;
789
717
default:
790
718
fprintf(stderr, "Unknown error while reading data from"
791
719
" encrypted session with Mandos server\n");
720
retval = -1;
792
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
793
722
goto mandos_end;
794
723
}
801
730
fprintf(stderr, "Closing TLS session\n");
802
731
}
803
732
804
if(quit_now){
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
if(quit_now){
811
goto mandos_end;
812
}
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
814
734
815
735
if(buffer_length > 0){
816
ssize_t decrypted_buffer_size;
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
818
737
buffer_length,
819
738
&decrypted_buffer);
820
739
if(decrypted_buffer_size >= 0){
821
822
740
written = 0;
823
741
while(written < (size_t) decrypted_buffer_size){
824
if(quit_now){
825
goto mandos_end;
826
}
827
828
742
ret = (int)fwrite(decrypted_buffer + written, 1,
829
743
(size_t)decrypted_buffer_size - written,
830
744
stdout);
833
747
fprintf(stderr, "Error writing encrypted data: %s\n",
834
748
strerror(errno));
835
749
}
836
goto mandos_end;
750
retval = -1;
751
break;
837
752
}
838
753
written += (size_t)ret;
839
754
}
840
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
841
758
}
759
} else {
760
retval = -1;
842
761
}
843
762
844
763
/* Shutdown procedure */
845
764
846
765
mandos_end:
847
free(decrypted_buffer);
848
766
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
852
768
if(ret == -1){
853
769
perror("close");
854
770
}
855
771
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
859
772
return retval;
860
773
}
861
774
872
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
787
flags,
875
AVAHI_GCC_UNUSED void* userdata){
788
void* userdata){
789
mandos_context *mc = userdata;
876
790
assert(r);
877
791
878
792
/* Called whenever a service has been resolved successfully or
879
793
timed out */
880
794
881
if(quit_now){
882
return;
883
}
884
885
795
switch(event){
886
796
default:
887
797
case AVAHI_RESOLVER_FAILURE:
888
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
800
avahi_strerror(avahi_server_errno(mc->server)));
891
801
break;
892
802
893
803
case AVAHI_RESOLVER_FOUND:
899
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
810
ip, (intmax_t)interface, port);
901
811
}
902
int ret = start_mandos_communication(ip, port, interface,
812
int ret = start_mandos_communication(ip, port, interface, mc,
903
813
avahi_proto_to_af(proto));
904
814
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
815
avahi_simple_poll_quit(mc->simple_poll);
906
816
}
907
817
}
908
818
}
918
828
const char *domain,
919
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
830
flags,
921
AVAHI_GCC_UNUSED void* userdata){
831
void* userdata){
832
mandos_context *mc = userdata;
922
833
assert(b);
923
834
924
835
/* Called whenever a new services becomes available on the LAN or
925
836
is removed from the LAN */
926
837
927
if(quit_now){
928
return;
929
}
930
931
838
switch(event){
932
839
default:
933
840
case AVAHI_BROWSER_FAILURE:
934
841
935
842
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
938
845
return;
939
846
940
847
case AVAHI_BROWSER_NEW:
943
850
the callback function is called the Avahi server will free the
944
851
resolver for us. */
945
852
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
949
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
858
name, avahi_strerror(avahi_server_errno(mc->server)));
951
859
break;
952
860
953
861
case AVAHI_BROWSER_REMOVE:
962
870
}
963
871
}
964
872
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
977
}
978
979
/*
980
* This function determines if a directory entry in /sys/class/net
981
* corresponds to an acceptable network device.
982
* (This function is passed to scandir(3) as a filter function.)
983
*/
984
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
994
return 0;
995
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read);
1005
if(flagstring == NULL){
1006
perror("malloc");
1007
close(flags_fd);
1008
return 0;
1009
}
1010
while(to_read > 0){
1011
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1012
(size_t)to_read));
1013
if(ssret == -1){
1014
perror("read");
1015
free(flagstring);
1016
close(flags_fd);
1017
return 0;
1018
}
1019
to_read -= ssret;
1020
if(ssret == 0){
1021
break;
1022
}
1023
}
1024
close(flags_fd);
1025
intmax_t tmpmax;
1026
char *tmp;
1027
errno = 0;
1028
tmpmax = strtoimax(flagstring, &tmp, 0);
1029
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1030
and not (isspace(*tmp)))
1031
or tmpmax != (ifreq_flags)tmpmax){
1032
free(flagstring);
1033
return 0;
1034
}
1035
free(flagstring);
1036
ifreq_flags flags = (ifreq_flags)tmpmax;
1037
/* Reject the loopback device */
1038
if(flags & IFF_LOOPBACK){
1039
return 0;
1040
}
1041
/* Accept point-to-point devices only if connect_to is specified */
1042
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1043
return 1;
1044
}
1045
/* Otherwise, reject non-broadcast-capable devices */
1046
if(not (flags & IFF_BROADCAST)){
1047
return 0;
1048
}
1049
/* Accept this device */
1050
return 1;
1051
}
1052
1053
873
int main(int argc, char *argv[]){
1054
874
AvahiSServiceBrowser *sb = NULL;
1055
875
int error;
1056
876
int ret;
1057
877
intmax_t tmpmax;
1058
char *tmp;
878
int numchars;
1059
879
int exitcode = EXIT_SUCCESS;
1060
const char *interface = "";
880
const char *interface = "eth0";
1061
881
struct ifreq network;
1062
int sd = -1;
1063
bool take_down_interface = false;
882
int sd;
1064
883
uid_t uid;
1065
884
gid_t gid;
885
char *connect_to = NULL;
1066
886
char tempdir[] = "/tmp/mandosXXXXXX";
1067
887
bool tempdir_created = false;
1068
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1069
889
const char *seckey = PATHDIR "/" SECKEY;
1070
890
const char *pubkey = PATHDIR "/" PUBKEY;
1071
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1072
895
bool gnutls_initialized = false;
1073
896
bool gpgme_initialized = false;
1074
float delay = 2.5f;
1075
1076
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1077
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1078
1079
uid = getuid();
1080
gid = getgid();
1081
1082
/* Lower any group privileges we might have, just to be safe */
1083
errno = 0;
1084
ret = setgid(gid);
1085
if(ret == -1){
1086
perror("setgid");
1087
}
1088
1089
/* Lower user privileges (temporarily) */
1090
errno = 0;
1091
ret = seteuid(uid);
1092
if(ret == -1){
1093
perror("seteuid");
1094
}
1095
1096
if(quit_now){
1097
goto end;
1098
}
897
double delay = 2.5;
1099
898
1100
899
{
1101
900
struct argp_option options[] = {
1153
952
pubkey = arg;
1154
953
break;
1155
954
case 129: /* --dh-bits */
1156
errno = 0;
1157
tmpmax = strtoimax(arg, &tmp, 10);
1158
if(errno != 0 or tmp == arg or *tmp != '\0'
1159
or tmpmax != (typeof(mc.dh_bits))tmpmax){
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
1160
958
fprintf(stderr, "Bad number of DH bits\n");
1161
959
exit(EXIT_FAILURE);
1162
960
}
1166
964
mc.priority = arg;
1167
965
break;
1168
966
case 131: /* --delay */
1169
errno = 0;
1170
delay = strtof(arg, &tmp);
1171
if(errno != 0 or tmp == arg or *tmp != '\0'){
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
1172
969
fprintf(stderr, "Bad delay\n");
1173
970
exit(EXIT_FAILURE);
1174
971
}
1195
992
}
1196
993
}
1197
994
1198
if(not debug){
1199
avahi_set_log_function(empty_log);
1200
}
1201
1202
if(interface[0] == '\0'){
1203
struct dirent **direntries;
1204
ret = scandir(sys_class_net, &direntries, good_interface,
1205
alphasort);
1206
if(ret >= 1){
1207
/* Pick the first good interface */
1208
interface = strdup(direntries[0]->d_name);
1209
if(interface == NULL){
1210
perror("malloc");
1211
free(direntries);
1212
exitcode = EXIT_FAILURE;
1213
goto end;
1214
}
1215
free(direntries);
1216
} else {
1217
free(direntries);
1218
fprintf(stderr, "Could not find a network interface\n");
1219
exitcode = EXIT_FAILURE;
1220
goto end;
1221
}
1222
}
1223
1224
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1225
from the signal handler */
1226
/* Initialize the pseudo-RNG for Avahi */
1227
srand((unsigned int) time(NULL));
1228
mc.simple_poll = avahi_simple_poll_new();
1229
if(mc.simple_poll == NULL){
1230
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1231
exitcode = EXIT_FAILURE;
1232
goto end;
1233
}
1234
1235
sigemptyset(&sigterm_action.sa_mask);
1236
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1237
if(ret == -1){
1238
perror("sigaddset");
1239
exitcode = EXIT_FAILURE;
1240
goto end;
1241
}
1242
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1243
if(ret == -1){
1244
perror("sigaddset");
1245
exitcode = EXIT_FAILURE;
1246
goto end;
1247
}
1248
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1249
if(ret == -1){
1250
perror("sigaddset");
1251
exitcode = EXIT_FAILURE;
1252
goto end;
1253
}
1254
/* Need to check if the handler is SIG_IGN before handling:
1255
| [[info:libc:Initial Signal Actions]] |
1256
| [[info:libc:Basic Signal Handling]] |
1257
*/
1258
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1259
if(ret == -1){
1260
perror("sigaction");
1261
return EXIT_FAILURE;
1262
}
1263
if(old_sigterm_action.sa_handler != SIG_IGN){
1264
ret = sigaction(SIGINT, &sigterm_action, NULL);
1265
if(ret == -1){
1266
perror("sigaction");
1267
exitcode = EXIT_FAILURE;
1268
goto end;
1269
}
1270
}
1271
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1272
if(ret == -1){
1273
perror("sigaction");
1274
return EXIT_FAILURE;
1275
}
1276
if(old_sigterm_action.sa_handler != SIG_IGN){
1277
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1278
if(ret == -1){
1279
perror("sigaction");
1280
exitcode = EXIT_FAILURE;
1281
goto end;
1282
}
1283
}
1284
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1285
if(ret == -1){
1286
perror("sigaction");
1287
return EXIT_FAILURE;
1288
}
1289
if(old_sigterm_action.sa_handler != SIG_IGN){
1290
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1291
if(ret == -1){
1292
perror("sigaction");
1293
exitcode = EXIT_FAILURE;
1294
goto end;
1295
}
1296
}
1297
1298
995
/* If the interface is down, bring it up */
1299
if(strcmp(interface, "none") != 0){
1300
if_index = (AvahiIfIndex) if_nametoindex(interface);
1301
if(if_index == 0){
1302
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Re-raise priviliges */
1312
errno = 0;
1313
ret = seteuid(0);
1314
if(ret == -1){
1315
perror("seteuid");
1316
}
1317
996
if(interface[0] != '\0'){
1318
997
#ifdef __linux__
1319
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1320
999
messages to mess up the prompt */
1324
1003
restore_loglevel = false;
1325
1004
perror("klogctl");
1326
1005
}
1327
#endif /* __linux__ */
1006
#endif
1328
1007
1329
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1330
1009
if(sd < 0){
1337
1016
perror("klogctl");
1338
1017
}
1339
1018
}
1340
#endif /* __linux__ */
1341
/* Lower privileges */
1342
errno = 0;
1343
ret = seteuid(uid);
1344
if(ret == -1){
1345
perror("seteuid");
1346
}
1019
#endif
1347
1020
goto end;
1348
1021
}
1349
1022
strcpy(network.ifr_name, interface);
1357
1030
perror("klogctl");
1358
1031
}
1359
1032
}
1360
#endif /* __linux__ */
1033
#endif
1361
1034
exitcode = EXIT_FAILURE;
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
1035
goto end;
1369
1036
}
1370
1037
if((network.ifr_flags & IFF_UP) == 0){
1371
1038
network.ifr_flags |= IFF_UP;
1372
take_down_interface = true;
1373
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1374
1040
if(ret == -1){
1375
take_down_interface = false;
1376
1041
perror("ioctl SIOCSIFFLAGS");
1377
1042
exitcode = EXIT_FAILURE;
1378
1043
#ifdef __linux__
1382
1047
perror("klogctl");
1383
1048
}
1384
1049
}
1385
#endif /* __linux__ */
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1050
#endif
1392
1051
goto end;
1393
1052
}
1394
1053
}
1406
1065
perror("nanosleep");
1407
1066
}
1408
1067
}
1409
if(not take_down_interface){
1410
/* We won't need the socket anymore */
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1412
if(ret == -1){
1413
perror("close");
1414
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1415
1071
}
1416
1072
#ifdef __linux__
1417
1073
if(restore_loglevel){
1421
1077
perror("klogctl");
1422
1078
}
1423
1079
}
1424
#endif /* __linux__ */
1425
/* Lower privileges */
1426
errno = 0;
1427
if(take_down_interface){
1428
/* Lower privileges */
1429
ret = seteuid(uid);
1430
if(ret == -1){
1431
perror("seteuid");
1432
}
1433
} else {
1434
/* Lower privileges permanently */
1435
ret = setuid(uid);
1436
if(ret == -1){
1437
perror("setuid");
1438
}
1439
}
1440
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
ret = init_gnutls_global(pubkey, seckey);
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);
1447
1098
if(ret == -1){
1448
1099
fprintf(stderr, "init_gnutls_global failed\n");
1449
1100
exitcode = EXIT_FAILURE;
1452
1103
gnutls_initialized = true;
1453
1104
}
1454
1105
1455
if(quit_now){
1456
goto end;
1457
}
1458
1459
tempdir_created = true;
1460
1106
if(mkdtemp(tempdir) == NULL){
1461
tempdir_created = false;
1462
1107
perror("mkdtemp");
1463
1108
goto end;
1464
1109
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
if(not init_gpgme(pubkey, seckey, tempdir)){
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1471
1113
fprintf(stderr, "init_gpgme failed\n");
1472
1114
exitcode = EXIT_FAILURE;
1473
1115
goto end;
1475
1117
gpgme_initialized = true;
1476
1118
}
1477
1119
1478
if(quit_now){
1479
goto end;
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
}
1480
1127
}
1481
1128
1482
1129
if(connect_to != NULL){
1488
1135
exitcode = EXIT_FAILURE;
1489
1136
goto end;
1490
1137
}
1491
1492
if(quit_now){
1493
goto end;
1494
}
1495
1496
1138
uint16_t port;
1497
errno = 0;
1498
tmpmax = strtoimax(address+1, &tmp, 10);
1499
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1500
or tmpmax != (uint16_t)tmpmax){
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1501
1142
fprintf(stderr, "Bad port number\n");
1502
1143
exitcode = EXIT_FAILURE;
1503
1144
goto end;
1504
1145
}
1505
1506
if(quit_now){
1507
goto end;
1508
}
1509
1510
1146
port = (uint16_t)tmpmax;
1511
1147
*address = '\0';
1512
1148
address = connect_to;
1517
1153
} else {
1518
1154
af = AF_INET;
1519
1155
}
1520
1521
if(quit_now){
1522
goto end;
1523
}
1524
1525
ret = start_mandos_communication(address, port, if_index, af);
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1526
1158
if(ret < 0){
1527
1159
exitcode = EXIT_FAILURE;
1528
1160
} else {
1531
1163
goto end;
1532
1164
}
1533
1165
1534
if(quit_now){
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;
1535
1178
goto end;
1536
1179
}
1537
1180
1561
1204
goto end;
1562
1205
}
1563
1206
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
1207
/* Create the Avahi service browser */
1569
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
1570
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1571
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1572
1211
if(sb == NULL){
1573
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1574
1213
avahi_strerror(avahi_server_errno(mc.server)));
1576
1215
goto end;
1577
1216
}
1578
1217
1579
if(quit_now){
1580
goto end;
1581
}
1582
1583
1218
/* Run the main loop */
1584
1219
1585
1220
if(debug){
1614
1249
gpgme_release(mc.ctx);
1615
1250
}
1616
1251
1617
/* Take down the network interface */
1618
if(take_down_interface){
1619
/* Re-raise priviliges */
1620
errno = 0;
1621
ret = seteuid(0);
1622
if(ret == -1){
1623
perror("seteuid");
1624
}
1625
if(geteuid() == 0){
1626
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1627
if(ret == -1){
1628
perror("ioctl SIOCGIFFLAGS");
1629
} else if(network.ifr_flags & IFF_UP) {
1630
network.ifr_flags &= ~IFF_UP; /* clear flag */
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1632
if(ret == -1){
1633
perror("ioctl SIOCSIFFLAGS");
1634
}
1635
}
1636
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1637
if(ret == -1){
1638
perror("close");
1639
}
1640
/* Lower privileges permanently */
1641
errno = 0;
1642
ret = setuid(uid);
1643
if(ret == -1){
1644
perror("setuid");
1645
}
1646
}
1647
}
1648
1649
1252
/* Removes the temp directory used by GPGME */
1650
1253
if(tempdir_created){
1651
1254
DIR *d;
1690
1293
}
1691
1294
}
1692
1295
1693
if(quit_now){
1694
sigemptyset(&old_sigterm_action.sa_mask);
1695
old_sigterm_action.sa_handler = SIG_DFL;
1696
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1697
&old_sigterm_action,
1698
NULL));
1699
if(ret == -1){
1700
perror("sigaction");
1701
}
1702
do {
1703
ret = raise(signal_received);
1704
} while(ret != 0 and errno == EINTR);
1705
if(ret != 0){
1706
perror("raise");
1707
abort();
1708
}
1709
TEMP_FAILURE_RETRY(pause());
1710
}
1711
1712
1296
return exitcode;
1713
1297
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0