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- Committer: Björn Påhlsson
- Date: 2009-02-08 01:50:24 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 306.
- Revision ID: belorn@braxen-20090208015024-jewaulcqtxvbopq6
Fixed a bug in fallback handling
- 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() */
48
#include <stdbool.h> /* bool, false, true */
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
56
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
63
#include <errno.h> /* perror(), errno */
66
64
#include <time.h> /* nanosleep(), time() */
67
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
66
SIOCSIFFLAGS, if_indextoname(),
69
67
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
68
#include <netinet/in.h>
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
#include <iso646.h> /* not, or, and */
73
#include <iso646.h> /* not, and, or */
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
137
129
gpgme_ctx_t ctx;
138
130
} mandos_context;
139
131
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
145
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
147
148
132
/*
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
151
* "buffer_length" is how much is already used.
133
* Make additional room in "buffer" for at least BUFFER_SIZE
134
* additional bytes. "buffer_capacity" is how much is currently
135
* allocated, "buffer_length" is how much is already used.
152
136
*/
153
137
size_t incbuffer(char **buffer, size_t buffer_length,
154
138
size_t buffer_capacity){
165
149
/*
166
150
* Initialize GPGME.
167
151
*/
168
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
169
153
const char *pubkey, const char *tempdir){
154
int ret;
170
155
gpgme_error_t rc;
171
156
gpgme_engine_info_t engine_info;
172
157
175
160
* Helper function to insert pub and seckey to the engine keyring.
176
161
*/
177
162
bool import_key(const char *filename){
178
int ret;
179
163
int fd;
180
164
gpgme_data_t pgp_data;
181
165
192
176
return false;
193
177
}
194
178
195
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
196
180
if(rc != GPG_ERR_NO_ERROR){
197
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
182
gpgme_strsource(rc), gpgme_strerror(rc));
208
192
}
209
193
210
194
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
212
196
}
213
197
214
198
/* Init GPGME */
241
225
}
242
226
243
227
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
245
229
if(rc != GPG_ERR_NO_ERROR){
246
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
231
gpgme_strsource(rc), gpgme_strerror(rc));
252
236
return false;
253
237
}
254
238
255
return true;
239
return true;
256
240
}
257
241
258
242
/*
259
243
* Decrypt OpenPGP data.
260
244
* Returns -1 on error
261
245
*/
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
263
248
size_t crypto_size,
264
249
char **plaintext){
265
250
gpgme_data_t dh_crypto, dh_plain;
292
277
293
278
/* Decrypt data from the cryptotext data buffer to the plaintext
294
279
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
281
if(rc != GPG_ERR_NO_ERROR){
297
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
283
gpgme_strsource(rc), gpgme_strerror(rc));
299
284
plaintext_length = -1;
300
285
if(debug){
301
286
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
303
288
if(result == NULL){
304
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
305
290
} else {
312
297
}
313
298
gpgme_recipient_t recipient;
314
299
recipient = result->recipients;
315
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
322
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
}
323
310
}
324
311
}
325
312
}
395
382
fprintf(stderr, "GnuTLS: %s", string);
396
383
}
397
384
398
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
399
387
const char *seckeyfilename){
400
388
int ret;
401
389
419
407
}
420
408
421
409
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
423
411
if(ret != GNUTLS_E_SUCCESS){
424
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
413
* from
414
* -Wunreachable-code
415
*/
428
416
safer_gnutls_strerror(ret));
429
417
gnutls_global_deinit();
430
418
return -1;
437
425
}
438
426
439
427
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
441
429
GNUTLS_OPENPGP_FMT_BASE64);
442
430
if(ret != GNUTLS_E_SUCCESS){
443
431
fprintf(stderr,
449
437
}
450
438
451
439
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
453
441
if(ret != GNUTLS_E_SUCCESS){
454
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
443
" %s\n", safer_gnutls_strerror(ret));
456
444
goto globalfail;
457
445
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
447
if(ret != GNUTLS_E_SUCCESS){
460
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
449
safer_gnutls_strerror(ret));
462
450
goto globalfail;
463
451
}
464
452
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
454
467
455
return 0;
468
456
469
457
globalfail:
470
458
471
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
472
460
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
474
462
return -1;
475
463
}
476
464
477
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
478
467
int ret;
479
468
/* GnuTLS session creation */
480
do {
481
ret = gnutls_init(session, GNUTLS_SERVER);
482
if(quit_now){
483
return -1;
484
}
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
486
470
if(ret != GNUTLS_E_SUCCESS){
487
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
472
safer_gnutls_strerror(ret));
490
474
491
475
{
492
476
const char *err;
493
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
495
if(quit_now){
496
gnutls_deinit(*session);
497
return -1;
498
}
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
500
478
if(ret != GNUTLS_E_SUCCESS){
501
479
fprintf(stderr, "Syntax error at: %s\n", err);
502
480
fprintf(stderr, "GnuTLS error: %s\n",
506
484
}
507
485
}
508
486
509
do {
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
512
if(quit_now){
513
gnutls_deinit(*session);
514
return -1;
515
}
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
517
489
if(ret != GNUTLS_E_SUCCESS){
518
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
491
safer_gnutls_strerror(ret));
522
494
}
523
495
524
496
/* ignore client certificate if any. */
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
526
499
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
528
501
529
502
return 0;
530
503
}
536
509
/* Called when a Mandos server is found */
537
510
static int start_mandos_communication(const char *ip, uint16_t port,
538
511
AvahiIfIndex if_index,
539
int af){
540
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
541
514
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
546
516
char *buffer = NULL;
547
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
548
518
size_t buffer_length = 0;
549
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
550
521
size_t written;
551
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
552
524
gnutls_session_t session;
553
int pf; /* Protocol family */
554
555
if(quit_now){
556
return -1;
557
}
558
559
switch(af){
560
case AF_INET6:
561
pf = PF_INET6;
562
break;
563
case AF_INET:
564
pf = PF_INET;
565
break;
566
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
568
return -1;
569
}
570
571
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
572
527
if(ret != 0){
573
528
return -1;
574
529
}
575
530
576
531
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
578
533
"\n", ip, port);
579
534
}
580
535
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
582
537
if(tcp_sd < 0){
583
538
perror("socket");
584
goto mandos_end;
539
return -1;
585
540
}
586
541
587
if(quit_now){
588
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
589
548
}
590
549
591
550
memset(&to, 0, sizeof(to));
592
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
595
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
598
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
599
555
if(ret < 0 ){
600
556
perror("inet_pton");
601
goto mandos_end;
557
return -1;
602
558
}
603
559
if(ret == 0){
604
560
fprintf(stderr, "Bad address: %s\n", ip);
605
goto mandos_end;
561
return -1;
606
562
}
607
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
615
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
618
goto mandos_end;
619
}
620
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
622
}
623
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
625
564
-Wconversion and
626
565
-Wunreachable-code */
627
}
628
566
629
if(quit_now){
630
goto mandos_end;
631
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
632
568
633
569
if(debug){
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
char interface[IF_NAMESIZE];
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
638
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
641
}
642
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
645
}
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
657
575
perror("inet_ntop");
658
576
} else {
659
577
if(strcmp(addrstr, ip) != 0){
662
580
}
663
581
}
664
582
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
674
584
if(ret < 0){
675
585
perror("connect");
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
586
return -1;
681
587
}
682
588
683
589
const char *out = mandos_protocol_version;
688
594
out_size - written));
689
595
if(ret == -1){
690
596
perror("write");
597
retval = -1;
691
598
goto mandos_end;
692
599
}
693
600
written += (size_t)ret;
701
608
break;
702
609
}
703
610
}
704
705
if(quit_now){
706
goto mandos_end;
707
}
708
611
}
709
612
710
613
if(debug){
711
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
712
615
}
713
616
714
if(quit_now){
715
goto mandos_end;
716
}
717
718
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
719
618
720
if(quit_now){
721
goto mandos_end;
722
}
723
724
do {
619
do{
725
620
ret = gnutls_handshake(session);
726
if(quit_now){
727
goto mandos_end;
728
}
729
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
622
731
623
if(ret != GNUTLS_E_SUCCESS){
733
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
734
626
gnutls_perror(ret);
735
627
}
628
retval = -1;
736
629
goto mandos_end;
737
630
}
738
631
739
632
/* Read OpenPGP packet that contains the wanted password */
740
633
741
634
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
743
636
ip);
744
637
}
745
638
746
639
while(true){
747
748
if(quit_now){
749
goto mandos_end;
750
}
751
752
640
buffer_capacity = incbuffer(&buffer, buffer_length,
753
641
buffer_capacity);
754
642
if(buffer_capacity == 0){
755
643
perror("incbuffer");
756
goto mandos_end;
757
}
758
759
if(quit_now){
644
retval = -1;
760
645
goto mandos_end;
761
646
}
762
647
771
656
case GNUTLS_E_AGAIN:
772
657
break;
773
658
case GNUTLS_E_REHANDSHAKE:
774
do {
659
do{
775
660
ret = gnutls_handshake(session);
776
777
if(quit_now){
778
goto mandos_end;
779
}
780
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
662
if(ret < 0){
782
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
783
664
gnutls_perror(ret);
665
retval = -1;
784
666
goto mandos_end;
785
667
}
786
668
break;
787
669
default:
788
670
fprintf(stderr, "Unknown error while reading data from"
789
671
" encrypted session with Mandos server\n");
672
retval = -1;
790
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
791
674
goto mandos_end;
792
675
}
799
682
fprintf(stderr, "Closing TLS session\n");
800
683
}
801
684
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
do {
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
if(quit_now){
809
goto mandos_end;
810
}
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
812
686
813
687
if(buffer_length > 0){
814
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
816
689
buffer_length,
817
690
&decrypted_buffer);
818
691
if(decrypted_buffer_size >= 0){
819
820
692
written = 0;
821
693
while(written < (size_t) decrypted_buffer_size){
822
if(quit_now){
823
goto mandos_end;
824
}
825
826
694
ret = (int)fwrite(decrypted_buffer + written, 1,
827
695
(size_t)decrypted_buffer_size - written,
828
696
stdout);
831
699
fprintf(stderr, "Error writing encrypted data: %s\n",
832
700
strerror(errno));
833
701
}
834
goto mandos_end;
702
retval = -1;
703
break;
835
704
}
836
705
written += (size_t)ret;
837
706
}
838
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
839
710
}
711
} else {
712
retval = -1;
840
713
}
841
714
842
715
/* Shutdown procedure */
843
716
844
717
mandos_end:
845
free(decrypted_buffer);
846
718
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
720
if(ret == -1){
851
721
perror("close");
852
722
}
853
723
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
856
}
857
724
return retval;
858
725
}
859
726
860
727
static void resolve_callback(AvahiSServiceResolver *r,
861
728
AvahiIfIndex interface,
862
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
863
730
AvahiResolverEvent event,
864
731
const char *name,
865
732
const char *type,
870
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
871
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
739
flags,
873
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
874
742
assert(r);
875
743
876
744
/* Called whenever a service has been resolved successfully or
877
745
timed out */
878
746
879
if(quit_now){
880
return;
881
}
882
883
747
switch(event){
884
748
default:
885
749
case AVAHI_RESOLVER_FAILURE:
886
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
889
753
break;
890
754
891
755
case AVAHI_RESOLVER_FOUND:
897
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
762
ip, (intmax_t)interface, port);
899
763
}
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
902
765
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
766
avahi_simple_poll_quit(mc->simple_poll);
904
767
}
905
768
}
906
769
}
916
779
const char *domain,
917
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
781
flags,
919
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
920
784
assert(b);
921
785
922
786
/* Called whenever a new services becomes available on the LAN or
923
787
is removed from the LAN */
924
788
925
if(quit_now){
926
return;
927
}
928
929
789
switch(event){
930
790
default:
931
791
case AVAHI_BROWSER_FAILURE:
932
792
933
793
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
936
796
return;
937
797
938
798
case AVAHI_BROWSER_NEW:
941
801
the callback function is called the Avahi server will free the
942
802
resolver for us. */
943
803
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
947
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
949
810
break;
950
811
951
812
case AVAHI_BROWSER_REMOVE:
960
821
}
961
822
}
962
823
963
/* stop main loop after sigterm has been called */
964
static void handle_sigterm(int sig){
965
if(quit_now){
966
return;
967
}
968
quit_now = 1;
969
signal_received = sig;
970
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
975
}
976
977
824
int main(int argc, char *argv[]){
978
825
AvahiSServiceBrowser *sb = NULL;
979
826
int error;
980
827
int ret;
981
828
intmax_t tmpmax;
982
char *tmp;
829
int numchars;
983
830
int exitcode = EXIT_SUCCESS;
984
831
const char *interface = "eth0";
985
832
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
833
int sd;
988
834
uid_t uid;
989
835
gid_t gid;
990
836
char *connect_to = NULL;
994
840
const char *seckey = PATHDIR "/" SECKEY;
995
841
const char *pubkey = PATHDIR "/" PUBKEY;
996
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
997
846
bool gnutls_initialized = false;
998
847
bool gpgme_initialized = false;
999
float delay = 2.5f;
1000
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1003
1004
uid = getuid();
1005
gid = getgid();
1006
1007
/* Lower any group privileges we might have, just to be safe */
1008
errno = 0;
1009
ret = setgid(gid);
1010
if(ret == -1){
1011
perror("setgid");
1012
}
1013
1014
/* Lower user privileges (temporarily) */
1015
errno = 0;
1016
ret = seteuid(uid);
1017
if(ret == -1){
1018
perror("seteuid");
1019
}
1020
1021
if(quit_now){
1022
goto end;
1023
}
848
double delay = 2.5;
1024
849
1025
850
{
1026
851
struct argp_option options[] = {
1032
857
.group = 1 },
1033
858
{ .name = "interface", .key = 'i',
1034
859
.arg = "NAME",
1035
.doc = "Network interface that will be used to search for"
1036
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1037
862
.group = 1 },
1038
863
{ .name = "seckey", .key = 's',
1039
864
.arg = "FILE",
1078
903
pubkey = arg;
1079
904
break;
1080
905
case 129: /* --dh-bits */
1081
errno = 0;
1082
tmpmax = strtoimax(arg, &tmp, 10);
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
1085
909
fprintf(stderr, "Bad number of DH bits\n");
1086
910
exit(EXIT_FAILURE);
1087
911
}
1091
915
mc.priority = arg;
1092
916
break;
1093
917
case 131: /* --delay */
1094
errno = 0;
1095
delay = strtof(arg, &tmp);
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
1097
920
fprintf(stderr, "Bad delay\n");
1098
921
exit(EXIT_FAILURE);
1099
922
}
1120
943
}
1121
944
}
1122
945
1123
if(not debug){
1124
avahi_set_log_function(empty_log);
1125
}
1126
1127
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1128
from the signal handler */
1129
/* Initialize the pseudo-RNG for Avahi */
1130
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1137
1138
sigemptyset(&sigterm_action.sa_mask);
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
1143
goto end;
1144
}
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
1149
goto end;
1150
}
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
/* Need to check if the handler is SIG_IGN before handling:
1158
| [[info:libc:Initial Signal Actions]] |
1159
| [[info:libc:Basic Signal Handling]] |
1160
*/
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
1165
}
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
}
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
1178
}
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
1184
goto end;
1185
}
1186
}
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
1191
}
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
946
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
947
{
1221
948
#ifdef __linux__
1222
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
950
messages to mess up the prompt */
1224
951
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
952
if(ret == -1){
1227
restore_loglevel = false;
1228
953
perror("klogctl");
1229
954
}
1230
#endif /* __linux__ */
955
#endif
1231
956
1232
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
958
if(sd < 0){
1234
959
perror("socket");
1235
960
exitcode = EXIT_FAILURE;
1236
961
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1247
963
if(ret == -1){
1248
perror("seteuid");
964
perror("klogctl");
1249
965
}
966
#endif
1250
967
goto end;
1251
968
}
1252
969
strcpy(network.ifr_name, interface);
1254
971
if(ret == -1){
1255
972
perror("ioctl SIOCGIFFLAGS");
1256
973
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
1262
977
}
1263
#endif /* __linux__ */
978
#endif
1264
979
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
980
goto end;
1272
981
}
1273
982
if((network.ifr_flags & IFF_UP) == 0){
1274
983
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
985
if(ret == -1){
1278
take_down_interface = false;
1279
986
perror("ioctl SIOCSIFFLAGS");
1280
987
exitcode = EXIT_FAILURE;
1281
988
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1292
990
if(ret == -1){
1293
perror("seteuid");
991
perror("klogctl");
1294
992
}
993
#endif
1295
994
goto end;
1296
995
}
1297
996
}
1309
1008
perror("nanosleep");
1310
1009
}
1311
1010
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1318
1014
}
1319
1015
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
1343
}
1344
1345
if(quit_now){
1346
goto end;
1347
}
1348
1349
ret = init_gnutls_global(pubkey, seckey);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1350
1038
if(ret == -1){
1351
1039
fprintf(stderr, "init_gnutls_global failed\n");
1352
1040
exitcode = EXIT_FAILURE;
1355
1043
gnutls_initialized = true;
1356
1044
}
1357
1045
1358
if(quit_now){
1359
goto end;
1360
}
1361
1362
tempdir_created = true;
1363
1046
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
1047
perror("mkdtemp");
1366
1048
goto end;
1367
1049
}
1368
1369
if(quit_now){
1370
goto end;
1371
}
1372
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1374
1053
fprintf(stderr, "init_gpgme failed\n");
1375
1054
exitcode = EXIT_FAILURE;
1376
1055
goto end;
1378
1057
gpgme_initialized = true;
1379
1058
}
1380
1059
1381
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1382
1064
goto end;
1383
1065
}
1384
1066
1391
1073
exitcode = EXIT_FAILURE;
1392
1074
goto end;
1393
1075
}
1394
1395
if(quit_now){
1396
goto end;
1397
}
1398
1399
1076
uint16_t port;
1400
errno = 0;
1401
tmpmax = strtoimax(address+1, &tmp, 10);
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1404
1080
fprintf(stderr, "Bad port number\n");
1405
1081
exitcode = EXIT_FAILURE;
1406
1082
goto end;
1407
1083
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1413
1084
port = (uint16_t)tmpmax;
1414
1085
*address = '\0';
1415
1086
address = connect_to;
1416
/* Colon in address indicates IPv6 */
1417
int af;
1418
if(strchr(address, ':') != NULL){
1419
af = AF_INET6;
1420
} else {
1421
af = AF_INET;
1422
}
1423
1424
if(quit_now){
1425
goto end;
1426
}
1427
1428
ret = start_mandos_communication(address, port, if_index, af);
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1429
1088
if(ret < 0){
1430
1089
exitcode = EXIT_FAILURE;
1431
1090
} else {
1434
1093
goto end;
1435
1094
}
1436
1095
1437
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
1438
1108
goto end;
1439
1109
}
1440
1110
1464
1134
goto end;
1465
1135
}
1466
1136
1467
if(quit_now){
1468
goto end;
1469
}
1470
1471
1137
/* Create the Avahi service browser */
1472
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1475
1141
if(sb == NULL){
1476
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1477
1143
avahi_strerror(avahi_server_errno(mc.server)));
1479
1145
goto end;
1480
1146
}
1481
1147
1482
if(quit_now){
1483
goto end;
1484
}
1485
1486
1148
/* Run the main loop */
1487
1149
1488
1150
if(debug){
1517
1179
gpgme_release(mc.ctx);
1518
1180
}
1519
1181
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
1182
/* Removes the temp directory used by GPGME */
1553
1183
if(tempdir_created){
1554
1184
DIR *d;
1593
1223
}
1594
1224
}
1595
1225
1596
if(quit_now){
1597
sigemptyset(&old_sigterm_action.sa_mask);
1598
old_sigterm_action.sa_handler = SIG_DFL;
1599
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1600
&old_sigterm_action,
1601
NULL));
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
do {
1606
ret = raise(signal_received);
1607
} while(ret != 0 and errno == EINTR);
1608
if(ret != 0){
1609
perror("raise");
1610
abort();
1611
}
1612
TEMP_FAILURE_RETRY(pause());
1613
}
1614
1615
1226
return exitcode;
1616
1227
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0