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- Committer: Teddy Hogeborn
- Date: 2010-09-12 03:22:48 UTC
- Revision ID: teddy@fukt.bsnet.se-20100912032248-6cizkymqivr5uzwm
* Makefile (run-server): Remove warning about now-eliminated error.
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
49
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
53
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
54
56
#include <sys/stat.h> /* open() */
55
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
57
connect() */
58
inet_pton(), connect() */
58
59
#include <fcntl.h> /* open() */
59
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
61
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
62
64
#include <assert.h> /* assert() */
63
65
#include <errno.h> /* perror(), errno */
64
66
#include <time.h> /* nanosleep(), time() */
65
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
68
SIOCSIFFLAGS, if_indextoname(),
67
69
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
75
79
argp_state, struct argp,
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
78
88
#ifdef __linux__
79
89
#include <sys/klog.h> /* klogctl() */
80
#endif
90
#endif /* __linux__ */
81
91
82
92
/* Avahi */
83
93
/* All Avahi types, constants and functions
117
127
static const char mandos_protocol_version[] = "1";
118
128
const char *argp_program_version = "mandos-client " VERSION;
119
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
120
132
121
133
/* Used for passing in values through the Avahi callback functions */
122
134
typedef struct {
129
141
gpgme_ctx_t ctx;
130
142
} mandos_context;
131
143
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
132
152
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
135
155
* "buffer_length" is how much is already used.
136
156
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
157
size_t incbuffer(char **buffer, size_t buffer_length,
138
158
size_t buffer_capacity){
139
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
149
169
/*
150
170
* Initialize GPGME.
151
171
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
172
static bool init_gpgme(const char *seckey,
153
173
const char *pubkey, const char *tempdir){
154
int ret;
155
174
gpgme_error_t rc;
156
175
gpgme_engine_info_t engine_info;
157
176
160
179
* Helper function to insert pub and seckey to the engine keyring.
161
180
*/
162
181
bool import_key(const char *filename){
182
int ret;
163
183
int fd;
164
184
gpgme_data_t pgp_data;
165
185
176
196
return false;
177
197
}
178
198
179
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
180
200
if(rc != GPG_ERR_NO_ERROR){
181
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
202
gpgme_strsource(rc), gpgme_strerror(rc));
192
212
}
193
213
194
214
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
215
fprintf(stderr, "Initializing GPGME\n");
196
216
}
197
217
198
218
/* Init GPGME */
225
245
}
226
246
227
247
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
229
249
if(rc != GPG_ERR_NO_ERROR){
230
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
251
gpgme_strsource(rc), gpgme_strerror(rc));
236
256
return false;
237
257
}
238
258
239
return true;
259
return true;
240
260
}
241
261
242
262
/*
243
263
* Decrypt OpenPGP data.
244
264
* Returns -1 on error
245
265
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
267
size_t crypto_size,
249
268
char **plaintext){
250
269
gpgme_data_t dh_crypto, dh_plain;
277
296
278
297
/* Decrypt data from the cryptotext data buffer to the plaintext
279
298
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
300
if(rc != GPG_ERR_NO_ERROR){
282
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
302
gpgme_strsource(rc), gpgme_strerror(rc));
284
303
plaintext_length = -1;
285
304
if(debug){
286
305
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
288
307
if(result == NULL){
289
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
309
} else {
297
316
}
298
317
gpgme_recipient_t recipient;
299
318
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
326
recipient = recipient->next;
310
327
}
311
328
}
312
329
}
326
343
327
344
*plaintext = NULL;
328
345
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
346
plaintext_capacity = incbuffer(plaintext,
330
347
(size_t)plaintext_length,
331
348
plaintext_capacity);
332
349
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
350
perror("incbuffer");
334
351
plaintext_length = -1;
335
352
goto decrypt_end;
336
353
}
382
399
fprintf(stderr, "GnuTLS: %s", string);
383
400
}
384
401
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
402
static int init_gnutls_global(const char *pubkeyfilename,
387
403
const char *seckeyfilename){
388
404
int ret;
389
405
407
423
}
408
424
409
425
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
411
427
if(ret != GNUTLS_E_SUCCESS){
412
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
429
from
430
-Wunreachable-code
431
*/
416
432
safer_gnutls_strerror(ret));
417
433
gnutls_global_deinit();
418
434
return -1;
425
441
}
426
442
427
443
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
429
445
GNUTLS_OPENPGP_FMT_BASE64);
430
446
if(ret != GNUTLS_E_SUCCESS){
431
447
fprintf(stderr,
437
453
}
438
454
439
455
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
441
457
if(ret != GNUTLS_E_SUCCESS){
442
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
459
" %s\n", safer_gnutls_strerror(ret));
444
460
goto globalfail;
445
461
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
463
if(ret != GNUTLS_E_SUCCESS){
448
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
465
safer_gnutls_strerror(ret));
450
466
goto globalfail;
451
467
}
452
468
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
470
455
471
return 0;
456
472
457
473
globalfail:
458
474
459
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
460
476
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
462
478
return -1;
463
479
}
464
480
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
467
482
int ret;
468
483
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
490
if(ret != GNUTLS_E_SUCCESS){
471
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
492
safer_gnutls_strerror(ret));
474
494
475
495
{
476
496
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
504
if(ret != GNUTLS_E_SUCCESS){
479
505
fprintf(stderr, "Syntax error at: %s\n", err);
480
506
fprintf(stderr, "GnuTLS error: %s\n",
484
510
}
485
511
}
486
512
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
521
if(ret != GNUTLS_E_SUCCESS){
490
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
523
safer_gnutls_strerror(ret));
494
526
}
495
527
496
528
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
530
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
532
502
533
return 0;
503
534
}
509
540
/* Called when a Mandos server is found */
510
541
static int start_mandos_communication(const char *ip, uint16_t port,
511
542
AvahiIfIndex if_index,
512
mandos_context *mc){
513
int ret, tcp_sd;
543
int af){
544
int ret, tcp_sd = -1;
514
545
ssize_t sret;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
516
550
char *buffer = NULL;
517
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
518
552
size_t buffer_length = 0;
519
553
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
521
554
size_t written;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
555
int retval = -1;
524
556
gnutls_session_t session;
525
526
ret = init_gnutls_session(mc, &session);
557
int pf; /* Protocol family */
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
switch(af){
567
case AF_INET6:
568
pf = PF_INET6;
569
break;
570
case AF_INET:
571
pf = PF_INET;
572
break;
573
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
return -1;
577
}
578
579
ret = init_gnutls_session(&session);
527
580
if(ret != 0){
528
581
return -1;
529
582
}
530
583
531
584
if(debug){
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
533
586
"\n", ip, port);
534
587
}
535
588
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
537
590
if(tcp_sd < 0){
591
int e = errno;
538
592
perror("socket");
539
return -1;
593
errno = e;
594
goto mandos_end;
540
595
}
541
596
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);
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
548
600
}
549
601
550
602
memset(&to, 0, sizeof(to));
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);
603
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
609
}
555
610
if(ret < 0 ){
611
int e = errno;
556
612
perror("inet_pton");
557
return -1;
613
errno = e;
614
goto mandos_end;
558
615
}
559
616
if(ret == 0){
617
int e = errno;
560
618
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
619
errno = e;
620
goto mandos_end;
562
621
}
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
635
}
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
638
}
639
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
564
641
-Wconversion and
565
642
-Wunreachable-code */
643
}
566
644
567
to.in6.sin6_scope_id = (uint32_t)if_index;
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
568
649
569
650
if(debug){
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){
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
655
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
658
}
659
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
662
}
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
575
674
perror("inet_ntop");
576
675
} else {
577
676
if(strcmp(addrstr, ip) != 0){
580
679
}
581
680
}
582
681
583
ret = connect(tcp_sd, &to.in, sizeof(to));
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
584
692
if(ret < 0){
693
int e = errno;
585
694
perror("connect");
586
return -1;
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
587
702
}
588
703
589
704
const char *out = mandos_protocol_version;
593
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
594
709
out_size - written));
595
710
if(ret == -1){
711
int e = errno;
596
712
perror("write");
597
retval = -1;
713
errno = e;
598
714
goto mandos_end;
599
715
}
600
716
written += (size_t)ret;
608
724
break;
609
725
}
610
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
611
732
}
612
733
613
734
if(debug){
614
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
736
}
616
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
617
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
744
619
do{
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
620
751
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
621
756
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
622
757
623
758
if(ret != GNUTLS_E_SUCCESS){
625
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
626
761
gnutls_perror(ret);
627
762
}
628
retval = -1;
763
errno = EPROTO;
629
764
goto mandos_end;
630
765
}
631
766
632
767
/* Read OpenPGP packet that contains the wanted password */
633
768
634
769
if(debug){
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
636
771
ip);
637
772
}
638
773
639
774
while(true){
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
buffer_capacity = incbuffer(&buffer, buffer_length,
641
782
buffer_capacity);
642
783
if(buffer_capacity == 0){
643
perror("adjustbuffer");
644
retval = -1;
784
int e = errno;
785
perror("incbuffer");
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
645
792
goto mandos_end;
646
793
}
647
794
656
803
case GNUTLS_E_AGAIN:
657
804
break;
658
805
case GNUTLS_E_REHANDSHAKE:
659
do{
806
do {
660
807
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
661
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
662
814
if(ret < 0){
663
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
664
816
gnutls_perror(ret);
665
retval = -1;
817
errno = EPROTO;
666
818
goto mandos_end;
667
819
}
668
820
break;
669
821
default:
670
822
fprintf(stderr, "Unknown error while reading data from"
671
823
" encrypted session with Mandos server\n");
672
retval = -1;
673
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
674
826
goto mandos_end;
675
827
}
676
828
} else {
682
834
fprintf(stderr, "Closing TLS session\n");
683
835
}
684
836
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
837
if(quit_now){
838
errno = EINTR;
839
goto mandos_end;
840
}
841
842
do {
843
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
686
849
687
850
if(buffer_length > 0){
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
851
ssize_t decrypted_buffer_size;
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
689
853
buffer_length,
690
854
&decrypted_buffer);
691
855
if(decrypted_buffer_size >= 0){
856
692
857
written = 0;
693
858
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
694
864
ret = (int)fwrite(decrypted_buffer + written, 1,
695
865
(size_t)decrypted_buffer_size - written,
696
866
stdout);
697
867
if(ret == 0 and ferror(stdout)){
868
int e = errno;
698
869
if(debug){
699
870
fprintf(stderr, "Error writing encrypted data: %s\n",
700
871
strerror(errno));
701
872
}
702
retval = -1;
703
break;
873
errno = e;
874
goto mandos_end;
704
875
}
705
876
written += (size_t)ret;
706
877
}
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
878
retval = 0;
710
879
}
711
} else {
712
retval = -1;
713
880
}
714
881
715
882
/* Shutdown procedure */
716
883
717
884
mandos_end:
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
885
{
886
int e = errno;
887
free(decrypted_buffer);
888
free(buffer);
889
if(tcp_sd >= 0){
890
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
891
}
892
if(ret == -1){
893
if(e == 0){
894
e = errno;
895
}
896
perror("close");
897
}
898
gnutls_deinit(session);
899
if(quit_now){
900
e = EINTR;
901
retval = -1;
902
}
903
errno = e;
722
904
}
723
gnutls_deinit(session);
724
905
return retval;
725
906
}
726
907
727
908
static void resolve_callback(AvahiSServiceResolver *r,
728
909
AvahiIfIndex interface,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
910
AvahiProtocol proto,
730
911
AvahiResolverEvent event,
731
912
const char *name,
732
913
const char *type,
737
918
AVAHI_GCC_UNUSED AvahiStringList *txt,
738
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
920
flags,
740
void* userdata){
741
mandos_context *mc = userdata;
921
AVAHI_GCC_UNUSED void* userdata){
742
922
assert(r);
743
923
744
924
/* Called whenever a service has been resolved successfully or
745
925
timed out */
746
926
927
if(quit_now){
928
return;
929
}
930
747
931
switch(event){
748
932
default:
749
933
case AVAHI_RESOLVER_FAILURE:
750
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
936
avahi_strerror(avahi_server_errno(mc.server)));
753
937
break;
754
938
755
939
case AVAHI_RESOLVER_FOUND:
761
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
946
ip, (intmax_t)interface, port);
763
947
}
764
int ret = start_mandos_communication(ip, port, interface, mc);
948
int ret = start_mandos_communication(ip, port, interface,
949
avahi_proto_to_af(proto));
765
950
if(ret == 0){
766
avahi_simple_poll_quit(mc->simple_poll);
951
avahi_simple_poll_quit(mc.simple_poll);
767
952
}
768
953
}
769
954
}
779
964
const char *domain,
780
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
966
flags,
782
void* userdata){
783
mandos_context *mc = userdata;
967
AVAHI_GCC_UNUSED void* userdata){
784
968
assert(b);
785
969
786
970
/* Called whenever a new services becomes available on the LAN or
787
971
is removed from the LAN */
788
972
973
if(quit_now){
974
return;
975
}
976
789
977
switch(event){
790
978
default:
791
979
case AVAHI_BROWSER_FAILURE:
792
980
793
981
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
796
984
return;
797
985
798
986
case AVAHI_BROWSER_NEW:
801
989
the callback function is called the Avahi server will free the
802
990
resolver for us. */
803
991
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
808
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
996
name, avahi_strerror(avahi_server_errno(mc.server)));
810
997
break;
811
998
812
999
case AVAHI_BROWSER_REMOVE:
821
1008
}
822
1009
}
823
1010
1011
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
1013
if(quit_now){
1014
return;
1015
}
1016
quit_now = 1;
1017
signal_received = sig;
1018
int old_errno = errno;
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1021
}
1022
errno = old_errno;
1023
}
1024
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1118
}
1119
824
1120
int main(int argc, char *argv[]){
825
1121
AvahiSServiceBrowser *sb = NULL;
826
1122
int error;
827
1123
int ret;
828
1124
intmax_t tmpmax;
829
int numchars;
1125
char *tmp;
830
1126
int exitcode = EXIT_SUCCESS;
831
const char *interface = "eth0";
1127
const char *interface = "";
832
1128
struct ifreq network;
833
int sd;
1129
int sd = -1;
1130
bool take_down_interface = false;
834
1131
uid_t uid;
835
1132
gid_t gid;
836
char *connect_to = NULL;
837
1133
char tempdir[] = "/tmp/mandosXXXXXX";
838
1134
bool tempdir_created = false;
839
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
840
1136
const char *seckey = PATHDIR "/" SECKEY;
841
1137
const char *pubkey = PATHDIR "/" PUBKEY;
842
1138
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
846
1139
bool gnutls_initialized = false;
847
1140
bool gpgme_initialized = false;
848
double delay = 2.5;
1141
float delay = 2.5f;
1142
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1145
1146
uid = getuid();
1147
gid = getgid();
1148
1149
/* Lower any group privileges we might have, just to be safe */
1150
errno = 0;
1151
ret = setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
/* Lower user privileges (temporarily) */
1157
errno = 0;
1158
ret = seteuid(uid);
1159
if(ret == -1){
1160
perror("seteuid");
1161
}
1162
1163
if(quit_now){
1164
goto end;
1165
}
849
1166
850
1167
{
851
1168
struct argp_option options[] = {
857
1174
.group = 1 },
858
1175
{ .name = "interface", .key = 'i',
859
1176
.arg = "NAME",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1177
.doc = "Network interface that will be used to search for"
1178
" Mandos servers",
862
1179
.group = 1 },
863
1180
{ .name = "seckey", .key = 's',
864
1181
.arg = "FILE",
881
1198
.arg = "SECONDS",
882
1199
.doc = "Maximum delay to wait for interface startup",
883
1200
.group = 2 },
1201
/*
1202
* These reproduce what we would get without ARGP_NO_HELP
1203
*/
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
884
1210
{ .name = NULL }
885
1211
};
886
1212
887
1213
error_t parse_opt(int key, char *arg,
888
1214
struct argp_state *state){
1215
errno = 0;
889
1216
switch(key){
890
1217
case 128: /* --debug */
891
1218
debug = true;
903
1230
pubkey = arg;
904
1231
break;
905
1232
case 129: /* --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);
1233
errno = 0;
1234
tmpmax = strtoimax(arg, &tmp, 10);
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
911
1238
}
912
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
913
1240
break;
915
1242
mc.priority = arg;
916
1243
break;
917
1244
case 131: /* --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);
1245
errno = 0;
1246
delay = strtof(arg, &tmp);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
922
1249
}
923
1250
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1251
/*
1252
* These reproduce what we would get without ARGP_NO_HELP
1253
*/
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
927
1264
break;
928
1265
default:
929
1266
return ARGP_ERR_UNKNOWN;
930
1267
}
931
return 0;
1268
return errno;
932
1269
}
933
1270
934
1271
struct argp argp = { .options = options, .parser = parse_opt,
935
1272
.args_doc = "",
936
1273
.doc = "Mandos client -- Get and decrypt"
937
1274
" passwords from a Mandos server" };
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");
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1277
switch(ret){
1278
case 0:
1279
break;
1280
case ENOMEM:
1281
default:
1282
errno = ret;
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1285
goto end;
1286
case EINVAL:
1287
exitcode = EX_USAGE;
1288
goto end;
1289
}
1290
}
1291
1292
if(not debug){
1293
avahi_set_log_function(empty_log);
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
941
1316
exitcode = EXIT_FAILURE;
942
1317
goto end;
943
1318
}
944
1319
}
945
1320
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
from the signal handler */
1323
/* Initialize the pseudo-RNG for Avahi */
1324
srand((unsigned int) time(NULL));
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1328
exitcode = EX_UNAVAILABLE;
1329
goto end;
1330
}
1331
1332
sigemptyset(&sigterm_action.sa_mask);
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
if(ret == -1){
1335
perror("sigaddset");
1336
exitcode = EX_OSERR;
1337
goto end;
1338
}
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
if(ret == -1){
1341
perror("sigaddset");
1342
exitcode = EX_OSERR;
1343
goto end;
1344
}
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
if(ret == -1){
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1354
*/
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
if(ret == -1){
1357
perror("sigaction");
1358
return EX_OSERR;
1359
}
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
if(ret == -1){
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1365
goto end;
1366
}
1367
}
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
if(ret == -1){
1370
perror("sigaction");
1371
return EX_OSERR;
1372
}
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
if(ret == -1){
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1378
goto end;
1379
}
1380
}
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
if(ret == -1){
1383
perror("sigaction");
1384
return EX_OSERR;
1385
}
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
if(ret == -1){
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1391
goto end;
1392
}
1393
}
1394
946
1395
/* If the interface is down, bring it up */
947
{
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
948
1415
#ifdef __linux__
949
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
1417
messages about the network interface to mess up the prompt */
951
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
952
1420
if(ret == -1){
1421
restore_loglevel = false;
953
1422
perror("klogctl");
954
1423
}
955
#endif
1424
#endif /* __linux__ */
956
1425
957
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
958
1427
if(sd < 0){
959
1428
perror("socket");
960
exitcode = EXIT_FAILURE;
1429
exitcode = EX_OSERR;
961
1430
#ifdef __linux__
962
ret = klogctl(7, NULL, 0);
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
963
1441
if(ret == -1){
964
perror("klogctl");
1442
perror("seteuid");
965
1443
}
966
#endif
967
1444
goto end;
968
1445
}
969
1446
strcpy(network.ifr_name, interface);
971
1448
if(ret == -1){
972
1449
perror("ioctl SIOCGIFFLAGS");
973
1450
#ifdef __linux__
974
ret = klogctl(7, NULL, 0);
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
975
1462
if(ret == -1){
976
perror("klogctl");
1463
perror("seteuid");
977
1464
}
978
#endif
979
exitcode = EXIT_FAILURE;
980
1465
goto end;
981
1466
}
982
1467
if((network.ifr_flags & IFF_UP) == 0){
983
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
984
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
985
1471
if(ret == -1){
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
988
1475
#ifdef __linux__
989
ret = klogctl(7, NULL, 0);
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
990
1486
if(ret == -1){
991
perror("klogctl");
1487
perror("seteuid");
992
1488
}
993
#endif
994
1489
goto end;
995
1490
}
996
1491
}
1008
1503
perror("nanosleep");
1009
1504
}
1010
1505
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1014
1512
}
1015
1513
#ifdef __linux__
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);
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
1537
}
1538
1539
if(quit_now){
1540
goto end;
1541
}
1542
1543
ret = init_gnutls_global(pubkey, seckey);
1038
1544
if(ret == -1){
1039
1545
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
1546
exitcode = EX_UNAVAILABLE;
1041
1547
goto end;
1042
1548
} else {
1043
1549
gnutls_initialized = true;
1044
1550
}
1045
1551
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1046
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1047
1559
perror("mkdtemp");
1048
1560
goto end;
1049
1561
}
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1562
1563
if(quit_now){
1564
goto end;
1565
}
1566
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1053
1568
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
1569
exitcode = EX_UNAVAILABLE;
1055
1570
goto end;
1056
1571
} else {
1057
1572
gpgme_initialized = true;
1058
1573
}
1059
1574
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;
1575
if(quit_now){
1064
1576
goto end;
1065
1577
}
1066
1578
1070
1582
char *address = strrchr(connect_to, ':');
1071
1583
if(address == NULL){
1072
1584
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1076
1593
uint16_t port;
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1594
errno = 0;
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
or tmpmax != (uint16_t)tmpmax){
1080
1598
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1084
1607
port = (uint16_t)tmpmax;
1085
1608
*address = '\0';
1086
1609
address = connect_to;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1610
/* Colon in address indicates IPv6 */
1611
int af;
1612
if(strchr(address, ':') != NULL){
1613
af = AF_INET6;
1614
} else {
1615
af = AF_INET;
1616
}
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1622
ret = start_mandos_communication(address, port, if_index, af);
1088
1623
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1090
1643
} else {
1091
1644
exitcode = EXIT_SUCCESS;
1092
1645
}
1093
1646
goto end;
1094
1647
}
1095
1648
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;
1649
if(quit_now){
1108
1650
goto end;
1109
1651
}
1110
1652
1130
1672
if(mc.server == NULL){
1131
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
1674
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1134
1680
goto end;
1135
1681
}
1136
1682
1137
1683
/* Create the Avahi service browser */
1138
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1141
1687
if(sb == NULL){
1142
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1143
1689
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1145
1695
goto end;
1146
1696
}
1147
1697
1179
1729
gpgme_release(mc.ctx);
1180
1730
}
1181
1731
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1182
1764
/* Removes the temp directory used by GPGME */
1183
1765
if(tempdir_created){
1184
1766
DIR *d;
1223
1805
}
1224
1806
}
1225
1807
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1226
1827
return exitcode;
1227
1828
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0