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- Committer: Teddy Hogeborn
- Date: 2009-02-05 02:33:05 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205023305-o7rkhr55e7w4pe1m
* plugins.d/password-prompt.c (quit_now): Changed type to "volatile
sig_atomic_t". All uses changed.
sig_atomic_t". All uses changed.
- files removed:
- 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
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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
78
#ifdef __linux__
89
79
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
80
#endif
91
81
92
82
/* Avahi */
93
83
/* All Avahi types, constants and functions
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
from
428
-Wunreachable-code
429
*/
413
* from
414
* -Wunreachable-code
415
*/
430
416
safer_gnutls_strerror(ret));
431
417
gnutls_global_deinit();
432
418
return -1;
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){
513
int ret, tcp_sd;
543
514
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
548
516
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
550
518
size_t buffer_length = 0;
551
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
552
521
size_t written;
553
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
554
524
gnutls_session_t session;
555
int pf; /* Protocol family */
556
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
564
switch(af){
565
case AF_INET6:
566
pf = PF_INET6;
567
break;
568
case AF_INET:
569
pf = PF_INET;
570
break;
571
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
574
return -1;
575
}
576
577
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
578
527
if(ret != 0){
579
528
return -1;
580
529
}
581
530
582
531
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
584
533
"\n", ip, port);
585
534
}
586
535
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
588
537
if(tcp_sd < 0){
589
int e = errno;
590
538
perror("socket");
591
errno = e;
592
goto mandos_end;
539
return -1;
593
540
}
594
541
595
if(quit_now){
596
errno = EINTR;
597
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);
598
548
}
599
549
600
550
memset(&to, 0, sizeof(to));
601
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
604
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
607
}
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);
608
555
if(ret < 0 ){
609
int e = errno;
610
556
perror("inet_pton");
611
errno = e;
612
goto mandos_end;
557
return -1;
613
558
}
614
559
if(ret == 0){
615
int e = errno;
616
560
fprintf(stderr, "Bad address: %s\n", ip);
617
errno = e;
618
goto mandos_end;
561
return -1;
619
562
}
620
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
628
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
631
errno = EINVAL;
632
goto mandos_end;
633
}
634
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
636
}
637
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
639
564
-Wconversion and
640
565
-Wunreachable-code */
641
}
642
566
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
647
568
648
569
if(debug){
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
char interface[IF_NAMESIZE];
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
653
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
656
}
657
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
660
}
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
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){
672
575
perror("inet_ntop");
673
576
} else {
674
577
if(strcmp(addrstr, ip) != 0){
677
580
}
678
581
}
679
582
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
690
584
if(ret < 0){
691
int e = errno;
692
585
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
586
return -1;
700
587
}
701
588
702
589
const char *out = mandos_protocol_version;
706
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
594
out_size - written));
708
595
if(ret == -1){
709
int e = errno;
710
596
perror("write");
711
errno = e;
597
retval = -1;
712
598
goto mandos_end;
713
599
}
714
600
written += (size_t)ret;
722
608
break;
723
609
}
724
610
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
611
}
731
612
732
613
if(debug){
733
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
734
615
}
735
616
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
618
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
619
do{
749
620
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
754
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
755
622
756
623
if(ret != GNUTLS_E_SUCCESS){
758
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
759
626
gnutls_perror(ret);
760
627
}
761
errno = EPROTO;
628
retval = -1;
762
629
goto mandos_end;
763
630
}
764
631
765
632
/* Read OpenPGP packet that contains the wanted password */
766
633
767
634
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
769
636
ip);
770
637
}
771
638
772
639
while(true){
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
780
641
buffer_capacity);
781
642
if(buffer_capacity == 0){
782
int e = errno;
783
perror("incbuffer");
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
790
645
goto mandos_end;
791
646
}
792
647
801
656
case GNUTLS_E_AGAIN:
802
657
break;
803
658
case GNUTLS_E_REHANDSHAKE:
804
do {
659
do{
805
660
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
811
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
662
if(ret < 0){
813
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
814
664
gnutls_perror(ret);
815
errno = EPROTO;
665
retval = -1;
816
666
goto mandos_end;
817
667
}
818
668
break;
819
669
default:
820
670
fprintf(stderr, "Unknown error while reading data from"
821
671
" encrypted session with Mandos server\n");
672
retval = -1;
822
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
824
674
goto mandos_end;
825
675
}
826
676
} else {
832
682
fprintf(stderr, "Closing TLS session\n");
833
683
}
834
684
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
847
686
848
687
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
851
689
buffer_length,
852
690
&decrypted_buffer);
853
691
if(decrypted_buffer_size >= 0){
854
855
692
written = 0;
856
693
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
862
694
ret = (int)fwrite(decrypted_buffer + written, 1,
863
695
(size_t)decrypted_buffer_size - written,
864
696
stdout);
865
697
if(ret == 0 and ferror(stdout)){
866
int e = errno;
867
698
if(debug){
868
699
fprintf(stderr, "Error writing encrypted data: %s\n",
869
700
strerror(errno));
870
701
}
871
errno = e;
872
goto mandos_end;
702
retval = -1;
703
break;
873
704
}
874
705
written += (size_t)ret;
875
706
}
876
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
877
710
}
711
} else {
712
retval = -1;
878
713
}
879
714
880
715
/* Shutdown procedure */
881
716
882
717
mandos_end:
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
902
722
}
723
gnutls_deinit(session);
903
724
return retval;
904
725
}
905
726
906
727
static void resolve_callback(AvahiSServiceResolver *r,
907
728
AvahiIfIndex interface,
908
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
909
730
AvahiResolverEvent event,
910
731
const char *name,
911
732
const char *type,
916
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
739
flags,
919
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
920
742
assert(r);
921
743
922
744
/* Called whenever a service has been resolved successfully or
923
745
timed out */
924
746
925
if(quit_now){
926
return;
927
}
928
929
747
switch(event){
930
748
default:
931
749
case AVAHI_RESOLVER_FAILURE:
932
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
935
753
break;
936
754
937
755
case AVAHI_RESOLVER_FOUND:
943
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
762
ip, (intmax_t)interface, port);
945
763
}
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
948
765
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
766
avahi_simple_poll_quit(mc->simple_poll);
950
767
}
951
768
}
952
769
}
962
779
const char *domain,
963
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
781
flags,
965
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
966
784
assert(b);
967
785
968
786
/* Called whenever a new services becomes available on the LAN or
969
787
is removed from the LAN */
970
788
971
if(quit_now){
972
return;
973
}
974
975
789
switch(event){
976
790
default:
977
791
case AVAHI_BROWSER_FAILURE:
978
792
979
793
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
982
796
return;
983
797
984
798
case AVAHI_BROWSER_NEW:
987
801
the callback function is called the Avahi server will free the
988
802
resolver for us. */
989
803
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
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)))
993
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
995
810
break;
996
811
997
812
case AVAHI_BROWSER_REMOVE:
1006
821
}
1007
822
}
1008
823
1009
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1011
if(quit_now){
1012
return;
1013
}
1014
quit_now = 1;
1015
signal_received = sig;
1016
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1021
}
1022
1023
824
int main(int argc, char *argv[]){
1024
825
AvahiSServiceBrowser *sb = NULL;
1025
826
int error;
1026
827
int ret;
1027
828
intmax_t tmpmax;
1028
char *tmp;
829
int numchars;
1029
830
int exitcode = EXIT_SUCCESS;
1030
831
const char *interface = "eth0";
1031
832
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
833
int sd;
1034
834
uid_t uid;
1035
835
gid_t gid;
1036
836
char *connect_to = NULL;
1040
840
const char *seckey = PATHDIR "/" SECKEY;
1041
841
const char *pubkey = PATHDIR "/" PUBKEY;
1042
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1043
846
bool gnutls_initialized = false;
1044
847
bool gpgme_initialized = false;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
848
double delay = 2.5;
1070
849
1071
850
{
1072
851
struct argp_option options[] = {
1078
857
.group = 1 },
1079
858
{ .name = "interface", .key = 'i',
1080
859
.arg = "NAME",
1081
.doc = "Network interface that will be used to search for"
1082
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1083
862
.group = 1 },
1084
863
{ .name = "seckey", .key = 's',
1085
864
.arg = "FILE",
1102
881
.arg = "SECONDS",
1103
882
.doc = "Maximum delay to wait for interface startup",
1104
883
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
1114
884
{ .name = NULL }
1115
885
};
1116
886
1117
887
error_t parse_opt(int key, char *arg,
1118
888
struct argp_state *state){
1119
errno = 0;
1120
889
switch(key){
1121
890
case 128: /* --debug */
1122
891
debug = true;
1134
903
pubkey = arg;
1135
904
break;
1136
905
case 129: /* --dh-bits */
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1142
911
}
1143
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
913
break;
1146
915
mc.priority = arg;
1147
916
break;
1148
917
case 131: /* --delay */
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
1153
922
}
1154
923
break;
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1168
927
break;
1169
928
default:
1170
929
return ARGP_ERR_UNKNOWN;
1171
930
}
1172
return errno;
931
return 0;
1173
932
}
1174
933
1175
934
struct argp argp = { .options = options, .parser = parse_opt,
1176
935
.args_doc = "",
1177
936
.doc = "Mandos client -- Get and decrypt"
1178
937
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
exitcode = EX_USAGE;
1192
goto end;
1193
}
1194
}
1195
1196
if(not debug){
1197
avahi_set_log_function(empty_log);
1198
}
1199
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
from the signal handler */
1202
/* Initialize the pseudo-RNG for Avahi */
1203
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1208
goto end;
1209
}
1210
1211
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
if(ret == -1){
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1216
goto end;
1217
}
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
if(ret == -1){
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1222
goto end;
1223
}
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
if(ret == -1){
1226
perror("sigaddset");
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
941
exitcode = EXIT_FAILURE;
1270
942
goto end;
1271
943
}
1272
944
}
1273
945
1274
946
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
947
{
1294
948
#ifdef __linux__
1295
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1297
951
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
952
if(ret == -1){
1300
restore_loglevel = false;
1301
953
perror("klogctl");
1302
954
}
1303
#endif /* __linux__ */
955
#endif
1304
956
1305
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
958
if(sd < 0){
1307
959
perror("socket");
1308
exitcode = EX_OSERR;
960
exitcode = EXIT_FAILURE;
1309
961
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1320
963
if(ret == -1){
1321
perror("seteuid");
964
perror("klogctl");
1322
965
}
966
#endif
1323
967
goto end;
1324
968
}
1325
969
strcpy(network.ifr_name, interface);
1327
971
if(ret == -1){
1328
972
perror("ioctl SIOCGIFFLAGS");
1329
973
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1341
975
if(ret == -1){
1342
perror("seteuid");
976
perror("klogctl");
1343
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1344
980
goto end;
1345
981
}
1346
982
if((network.ifr_flags & IFF_UP) == 0){
1347
983
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
985
if(ret == -1){
1351
take_down_interface = false;
1352
986
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
987
exitcode = EXIT_FAILURE;
1354
988
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1365
990
if(ret == -1){
1366
perror("seteuid");
991
perror("klogctl");
1367
992
}
993
#endif
1368
994
goto end;
1369
995
}
1370
996
}
1382
1008
perror("nanosleep");
1383
1009
}
1384
1010
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1391
1014
}
1392
1015
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
goto end;
1420
}
1421
1422
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);
1423
1038
if(ret == -1){
1424
1039
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1040
exitcode = EXIT_FAILURE;
1426
1041
goto end;
1427
1042
} else {
1428
1043
gnutls_initialized = true;
1429
1044
}
1430
1045
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1436
1046
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
1047
perror("mkdtemp");
1439
1048
goto end;
1440
1049
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1447
1053
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1054
exitcode = EXIT_FAILURE;
1449
1055
goto end;
1450
1056
} else {
1451
1057
gpgme_initialized = true;
1452
1058
}
1453
1059
1454
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;
1455
1064
goto end;
1456
1065
}
1457
1066
1461
1070
char *address = strrchr(connect_to, ':');
1462
1071
if(address == NULL){
1463
1072
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1472
1076
uint16_t port;
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
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'){
1477
1080
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1486
1084
port = (uint16_t)tmpmax;
1487
1085
*address = '\0';
1488
1086
address = connect_to;
1489
/* Colon in address indicates IPv6 */
1490
int af;
1491
if(strchr(address, ':') != NULL){
1492
af = AF_INET6;
1493
} else {
1494
af = AF_INET;
1495
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1502
1088
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1089
exitcode = EXIT_FAILURE;
1522
1090
} else {
1523
1091
exitcode = EXIT_SUCCESS;
1524
1092
}
1525
1093
goto end;
1526
1094
}
1527
1095
1528
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;
1529
1108
goto end;
1530
1109
}
1531
1110
1551
1130
if(mc.server == NULL){
1552
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
1132
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1133
exitcode = EXIT_FAILURE;
1559
1134
goto end;
1560
1135
}
1561
1136
1562
1137
/* Create the Avahi service browser */
1563
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1566
1141
if(sb == NULL){
1567
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1568
1143
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1144
exitcode = EXIT_FAILURE;
1574
1145
goto end;
1575
1146
}
1576
1147
1608
1179
gpgme_release(mc.ctx);
1609
1180
}
1610
1181
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
1182
/* Removes the temp directory used by GPGME */
1644
1183
if(tempdir_created){
1645
1184
DIR *d;
1684
1223
}
1685
1224
}
1686
1225
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1706
1226
return exitcode;
1707
1227
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0