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- Committer: Teddy Hogeborn
- Date: 2009-09-17 02:42:49 UTC
- Revision ID: teddy@fukt.bsnet.se-20090917024249-y6j76xtzz3i2vptv
* plugins.d/mandos-client.c (init_gnutls_session): Always fail and
return immediately
if interrupted by
signal.
return immediately
if interrupted by
signal.
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
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
#include <time.h> /* time() */
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(),
74
getuid(), getgid(), seteuid(),
71
75
setgid() */
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
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
78
89
79
90
/* Avahi */
80
91
/* All Avahi types, constants and functions
126
137
gpgme_ctx_t ctx;
127
138
} mandos_context;
128
139
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
129
148
/*
130
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
131
* "buffer_capacity" is how much is currently allocated,
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
132
151
* "buffer_length" is how much is already used.
133
152
*/
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
153
size_t incbuffer(char **buffer, size_t buffer_length,
135
154
size_t buffer_capacity){
136
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
137
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
146
165
/*
147
166
* Initialize GPGME.
148
167
*/
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
168
static bool init_gpgme(const char *seckey,
150
169
const char *pubkey, const char *tempdir){
151
int ret;
152
170
gpgme_error_t rc;
153
171
gpgme_engine_info_t engine_info;
154
172
155
173
156
174
/*
157
* Helper function to insert pub and seckey to the enigne keyring.
175
* Helper function to insert pub and seckey to the engine keyring.
158
176
*/
159
177
bool import_key(const char *filename){
178
int ret;
160
179
int fd;
161
180
gpgme_data_t pgp_data;
162
181
173
192
return false;
174
193
}
175
194
176
rc = gpgme_op_import(mc->ctx, pgp_data);
195
rc = gpgme_op_import(mc.ctx, pgp_data);
177
196
if(rc != GPG_ERR_NO_ERROR){
178
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
198
gpgme_strsource(rc), gpgme_strerror(rc));
189
208
}
190
209
191
210
if(debug){
192
fprintf(stderr, "Initialize gpgme\n");
211
fprintf(stderr, "Initializing GPGME\n");
193
212
}
194
213
195
214
/* Init GPGME */
222
241
}
223
242
224
243
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
244
rc = gpgme_new(&(mc.ctx));
226
245
if(rc != GPG_ERR_NO_ERROR){
227
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
247
gpgme_strsource(rc), gpgme_strerror(rc));
233
252
return false;
234
253
}
235
254
236
return true;
255
return true;
237
256
}
238
257
239
258
/*
240
259
* Decrypt OpenPGP data.
241
260
* Returns -1 on error
242
261
*/
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
245
263
size_t crypto_size,
246
264
char **plaintext){
247
265
gpgme_data_t dh_crypto, dh_plain;
274
292
275
293
/* Decrypt data from the cryptotext data buffer to the plaintext
276
294
data buffer */
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
278
296
if(rc != GPG_ERR_NO_ERROR){
279
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
298
gpgme_strsource(rc), gpgme_strerror(rc));
281
299
plaintext_length = -1;
282
300
if(debug){
283
301
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
302
result = gpgme_op_decrypt_result(mc.ctx);
285
303
if(result == NULL){
286
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
305
} else {
294
312
}
295
313
gpgme_recipient_t recipient;
296
314
recipient = result->recipients;
297
if(recipient){
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
304
? "No" : "Yes");
305
recipient = recipient->next;
306
}
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;
307
323
}
308
324
}
309
325
}
323
339
324
340
*plaintext = NULL;
325
341
while(true){
326
plaintext_capacity = adjustbuffer(plaintext,
342
plaintext_capacity = incbuffer(plaintext,
327
343
(size_t)plaintext_length,
328
344
plaintext_capacity);
329
345
if(plaintext_capacity == 0){
330
perror("adjustbuffer");
346
perror("incbuffer");
331
347
plaintext_length = -1;
332
348
goto decrypt_end;
333
349
}
365
381
return plaintext_length;
366
382
}
367
383
368
static const char * safer_gnutls_strerror(int value) {
384
static const char * safer_gnutls_strerror(int value){
369
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
386
-Wunreachable-code */
371
387
if(ret == NULL)
379
395
fprintf(stderr, "GnuTLS: %s", string);
380
396
}
381
397
382
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
398
static int init_gnutls_global(const char *pubkeyfilename,
384
399
const char *seckeyfilename){
385
400
int ret;
386
401
389
404
}
390
405
391
406
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
407
if(ret != GNUTLS_E_SUCCESS){
393
408
fprintf(stderr, "GnuTLS global_init: %s\n",
394
409
safer_gnutls_strerror(ret));
395
410
return -1;
404
419
}
405
420
406
421
/* OpenPGP credentials */
407
gnutls_certificate_allocate_credentials(&mc->cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
408
423
if(ret != GNUTLS_E_SUCCESS){
409
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
410
* from
411
* -Wunreachable-code
412
*/
425
from
426
-Wunreachable-code
427
*/
413
428
safer_gnutls_strerror(ret));
414
429
gnutls_global_deinit();
415
430
return -1;
422
437
}
423
438
424
439
ret = gnutls_certificate_set_openpgp_key_file
425
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
426
441
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
442
if(ret != GNUTLS_E_SUCCESS){
428
443
fprintf(stderr,
429
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
449
}
435
450
436
451
/* GnuTLS server initialization */
437
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
439
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
455
" %s\n", safer_gnutls_strerror(ret));
441
456
goto globalfail;
442
457
}
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
445
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
461
safer_gnutls_strerror(ret));
447
462
goto globalfail;
448
463
}
449
464
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
451
466
452
467
return 0;
453
468
454
469
globalfail:
455
470
456
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
457
472
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
459
474
return -1;
460
475
}
461
476
462
static int init_gnutls_session(mandos_context *mc,
463
gnutls_session_t *session){
477
static int init_gnutls_session(gnutls_session_t *session){
464
478
int ret;
465
479
/* GnuTLS session creation */
466
ret = gnutls_init(session, GNUTLS_SERVER);
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);
467
486
if(ret != GNUTLS_E_SUCCESS){
468
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
488
safer_gnutls_strerror(ret));
471
490
472
491
{
473
492
const char *err;
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
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);
500
if(ret != GNUTLS_E_SUCCESS){
476
501
fprintf(stderr, "Syntax error at: %s\n", err);
477
502
fprintf(stderr, "GnuTLS error: %s\n",
478
503
safer_gnutls_strerror(ret));
481
506
}
482
507
}
483
508
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
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);
517
if(ret != GNUTLS_E_SUCCESS){
487
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
519
safer_gnutls_strerror(ret));
489
520
gnutls_deinit(*session);
491
522
}
492
523
493
524
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
496
526
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
498
528
499
529
return 0;
500
530
}
506
536
/* Called when a Mandos server is found */
507
537
static int start_mandos_communication(const char *ip, uint16_t port,
508
538
AvahiIfIndex if_index,
509
mandos_context *mc){
510
int ret, tcp_sd;
539
int af){
540
int ret, tcp_sd = -1;
511
541
ssize_t sret;
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
513
546
char *buffer = NULL;
514
547
char *decrypted_buffer;
515
548
size_t buffer_length = 0;
516
549
size_t buffer_capacity = 0;
517
ssize_t decrypted_buffer_size;
518
550
size_t written;
519
551
int retval = 0;
520
char interface[IF_NAMESIZE];
521
552
gnutls_session_t session;
522
523
ret = init_gnutls_session(mc, &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);
524
572
if(ret != 0){
525
573
return -1;
526
574
}
527
575
528
576
if(debug){
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
530
578
"\n", ip, port);
531
579
}
532
580
533
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(tcp_sd < 0) {
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
if(tcp_sd < 0){
535
583
perror("socket");
536
return -1;
584
retval = -1;
585
goto mandos_end;
537
586
}
538
587
539
if(debug){
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
perror("if_indextoname");
542
return -1;
543
}
544
fprintf(stderr, "Binding to interface %s\n", interface);
588
if(quit_now){
589
retval = -1;
590
goto mandos_end;
545
591
}
546
592
547
593
memset(&to, 0, sizeof(to));
548
to.in6.sin6_family = AF_INET6;
549
/* It would be nice to have a way to detect if we were passed an
550
IPv4 address here. Now we assume an IPv6 address. */
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
594
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
600
}
552
601
if(ret < 0 ){
553
602
perror("inet_pton");
554
return -1;
603
retval = -1;
604
goto mandos_end;
555
605
}
556
606
if(ret == 0){
557
607
fprintf(stderr, "Bad address: %s\n", ip);
558
return -1;
608
retval = -1;
609
goto mandos_end;
559
610
}
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
if(af == AF_INET6){
612
to.in6.sin6_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
615
616
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
617
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
618
-Wunreachable-code*/
619
if(if_index == AVAHI_IF_UNSPEC){
620
fprintf(stderr, "An IPv6 link-local address is incomplete"
621
" without a network interface\n");
622
retval = -1;
623
goto mandos_end;
624
}
625
/* Set the network interface number as scope */
626
to.in6.sin6_scope_id = (uint32_t)if_index;
627
}
628
} else {
629
to.in.sin_port = htons(port); /* Spurious warnings from
561
630
-Wconversion and
562
631
-Wunreachable-code */
632
}
563
633
564
to.in6.sin6_scope_id = (uint32_t)if_index;
634
if(quit_now){
635
retval = -1;
636
goto mandos_end;
637
}
565
638
566
639
if(debug){
567
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
568
port);
569
char addrstr[INET6_ADDRSTRLEN] = "";
570
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
571
sizeof(addrstr)) == NULL){
640
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
641
char interface[IF_NAMESIZE];
642
if(if_indextoname((unsigned int)if_index, interface) == NULL){
643
perror("if_indextoname");
644
} else {
645
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
646
ip, interface, port);
647
}
648
} else {
649
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
650
port);
651
}
652
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
653
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
654
const char *pcret;
655
if(af == AF_INET6){
656
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
657
sizeof(addrstr));
658
} else {
659
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
660
sizeof(addrstr));
661
}
662
if(pcret == NULL){
572
663
perror("inet_ntop");
573
664
} else {
574
665
if(strcmp(addrstr, ip) != 0){
577
668
}
578
669
}
579
670
580
ret = connect(tcp_sd, &to.in, sizeof(to));
671
if(quit_now){
672
retval = -1;
673
goto mandos_end;
674
}
675
676
if(af == AF_INET6){
677
ret = connect(tcp_sd, &to.in6, sizeof(to));
678
} else {
679
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
680
}
581
681
if(ret < 0){
582
682
perror("connect");
583
return -1;
683
retval = -1;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
retval = -1;
689
goto mandos_end;
584
690
}
585
691
586
692
const char *out = mandos_protocol_version;
605
711
break;
606
712
}
607
713
}
714
715
if(quit_now){
716
retval = -1;
717
goto mandos_end;
718
}
608
719
}
609
720
610
721
if(debug){
611
722
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
723
}
613
724
725
if(quit_now){
726
retval = -1;
727
goto mandos_end;
728
}
729
614
730
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
731
616
do{
732
if(quit_now){
733
retval = -1;
734
goto mandos_end;
735
}
736
737
do {
617
738
ret = gnutls_handshake(session);
739
if(quit_now){
740
retval = -1;
741
goto mandos_end;
742
}
618
743
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
619
744
620
745
if(ret != GNUTLS_E_SUCCESS){
629
754
/* Read OpenPGP packet that contains the wanted password */
630
755
631
756
if(debug){
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
757
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
633
758
ip);
634
759
}
635
760
636
761
while(true){
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
762
763
if(quit_now){
764
retval = -1;
765
goto mandos_end;
766
}
767
768
buffer_capacity = incbuffer(&buffer, buffer_length,
638
769
buffer_capacity);
639
770
if(buffer_capacity == 0){
640
perror("adjustbuffer");
771
perror("incbuffer");
772
retval = -1;
773
goto mandos_end;
774
}
775
776
if(quit_now){
641
777
retval = -1;
642
778
goto mandos_end;
643
779
}
653
789
case GNUTLS_E_AGAIN:
654
790
break;
655
791
case GNUTLS_E_REHANDSHAKE:
656
do{
792
do {
657
793
ret = gnutls_handshake(session);
794
795
if(quit_now){
796
retval = -1;
797
goto mandos_end;
798
}
658
799
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
659
800
if(ret < 0){
660
801
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
679
820
fprintf(stderr, "Closing TLS session\n");
680
821
}
681
822
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
if(quit_now){
824
retval = -1;
825
goto mandos_end;
826
}
827
828
do {
829
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
830
if(quit_now){
831
retval = -1;
832
goto mandos_end;
833
}
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
683
835
684
836
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
837
ssize_t decrypted_buffer_size;
838
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
839
buffer_length,
687
840
&decrypted_buffer);
688
841
if(decrypted_buffer_size >= 0){
842
689
843
written = 0;
690
844
while(written < (size_t) decrypted_buffer_size){
845
if(quit_now){
846
retval = -1;
847
goto mandos_end;
848
}
849
691
850
ret = (int)fwrite(decrypted_buffer + written, 1,
692
851
(size_t)decrypted_buffer_size - written,
693
852
stdout);
713
872
714
873
mandos_end:
715
874
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
875
if(tcp_sd >= 0){
876
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
877
}
717
878
if(ret == -1){
718
879
perror("close");
719
880
}
720
881
gnutls_deinit(session);
882
if(quit_now){
883
retval = -1;
884
}
721
885
return retval;
722
886
}
723
887
724
888
static void resolve_callback(AvahiSServiceResolver *r,
725
889
AvahiIfIndex interface,
726
AVAHI_GCC_UNUSED AvahiProtocol protocol,
890
AvahiProtocol proto,
727
891
AvahiResolverEvent event,
728
892
const char *name,
729
893
const char *type,
734
898
AVAHI_GCC_UNUSED AvahiStringList *txt,
735
899
AVAHI_GCC_UNUSED AvahiLookupResultFlags
736
900
flags,
737
void* userdata) {
738
mandos_context *mc = userdata;
901
AVAHI_GCC_UNUSED void* userdata){
739
902
assert(r);
740
903
741
904
/* Called whenever a service has been resolved successfully or
742
905
timed out */
743
906
744
switch(event) {
907
if(quit_now){
908
return;
909
}
910
911
switch(event){
745
912
default:
746
913
case AVAHI_RESOLVER_FAILURE:
747
914
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
748
915
" of type '%s' in domain '%s': %s\n", name, type, domain,
749
avahi_strerror(avahi_server_errno(mc->server)));
916
avahi_strerror(avahi_server_errno(mc.server)));
750
917
break;
751
918
752
919
case AVAHI_RESOLVER_FOUND:
758
925
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
926
ip, (intmax_t)interface, port);
760
927
}
761
int ret = start_mandos_communication(ip, port, interface, mc);
928
int ret = start_mandos_communication(ip, port, interface,
929
avahi_proto_to_af(proto));
762
930
if(ret == 0){
763
avahi_simple_poll_quit(mc->simple_poll);
931
avahi_simple_poll_quit(mc.simple_poll);
764
932
}
765
933
}
766
934
}
767
935
avahi_s_service_resolver_free(r);
768
936
}
769
937
770
static void browse_callback( AvahiSServiceBrowser *b,
771
AvahiIfIndex interface,
772
AvahiProtocol protocol,
773
AvahiBrowserEvent event,
774
const char *name,
775
const char *type,
776
const char *domain,
777
AVAHI_GCC_UNUSED AvahiLookupResultFlags
778
flags,
779
void* userdata) {
780
mandos_context *mc = userdata;
938
static void browse_callback(AvahiSServiceBrowser *b,
939
AvahiIfIndex interface,
940
AvahiProtocol protocol,
941
AvahiBrowserEvent event,
942
const char *name,
943
const char *type,
944
const char *domain,
945
AVAHI_GCC_UNUSED AvahiLookupResultFlags
946
flags,
947
AVAHI_GCC_UNUSED void* userdata){
781
948
assert(b);
782
949
783
950
/* Called whenever a new services becomes available on the LAN or
784
951
is removed from the LAN */
785
952
786
switch(event) {
953
if(quit_now){
954
return;
955
}
956
957
switch(event){
787
958
default:
788
959
case AVAHI_BROWSER_FAILURE:
789
960
790
961
fprintf(stderr, "(Avahi browser) %s\n",
791
avahi_strerror(avahi_server_errno(mc->server)));
792
avahi_simple_poll_quit(mc->simple_poll);
962
avahi_strerror(avahi_server_errno(mc.server)));
963
avahi_simple_poll_quit(mc.simple_poll);
793
964
return;
794
965
795
966
case AVAHI_BROWSER_NEW:
798
969
the callback function is called the Avahi server will free the
799
970
resolver for us. */
800
971
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
802
protocol, name, type, domain,
803
AVAHI_PROTO_INET6, 0,
804
resolve_callback, mc)))
972
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
973
name, type, domain, protocol, 0,
974
resolve_callback, NULL) == NULL)
805
975
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
806
name, avahi_strerror(avahi_server_errno(mc->server)));
976
name, avahi_strerror(avahi_server_errno(mc.server)));
807
977
break;
808
978
809
979
case AVAHI_BROWSER_REMOVE:
818
988
}
819
989
}
820
990
991
/* stop main loop after sigterm has been called */
992
static void handle_sigterm(int sig){
993
if(quit_now){
994
return;
995
}
996
quit_now = 1;
997
signal_received = sig;
998
int old_errno = errno;
999
if(mc.simple_poll != NULL){
1000
avahi_simple_poll_quit(mc.simple_poll);
1001
}
1002
errno = old_errno;
1003
}
1004
821
1005
int main(int argc, char *argv[]){
822
AvahiSServiceBrowser *sb = NULL;
823
int error;
824
int ret;
825
intmax_t tmpmax;
826
int numchars;
827
int exitcode = EXIT_SUCCESS;
828
const char *interface = "eth0";
829
struct ifreq network;
830
int sd;
831
uid_t uid;
832
gid_t gid;
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
839
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initialized = false;
843
bool gpgme_initialized = false;
844
845
{
846
struct argp_option options[] = {
847
{ .name = "debug", .key = 128,
848
.doc = "Debug mode", .group = 3 },
849
{ .name = "connect", .key = 'c',
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
852
.group = 1 },
853
{ .name = "interface", .key = 'i',
854
.arg = "NAME",
855
.doc = "Interface that will be used to search for Mandos"
856
" servers",
857
.group = 1 },
858
{ .name = "seckey", .key = 's',
859
.arg = "FILE",
860
.doc = "OpenPGP secret key file base name",
861
.group = 1 },
862
{ .name = "pubkey", .key = 'p',
863
.arg = "FILE",
864
.doc = "OpenPGP public key file base name",
865
.group = 2 },
866
{ .name = "dh-bits", .key = 129,
867
.arg = "BITS",
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
870
.group = 2 },
871
{ .name = "priority", .key = 130,
872
.arg = "STRING",
873
.doc = "GnuTLS priority string for the TLS handshake",
874
.group = 1 },
875
{ .name = NULL }
876
};
877
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
880
switch(key) {
881
case 128: /* --debug */
882
debug = true;
883
break;
884
case 'c': /* --connect */
885
connect_to = arg;
886
break;
887
case 'i': /* --interface */
888
interface = arg;
889
break;
890
case 's': /* --seckey */
891
seckey = arg;
892
break;
893
case 'p': /* --pubkey */
894
pubkey = arg;
895
break;
896
case 129: /* --dh-bits */
897
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
898
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
899
or arg[numchars] != '\0'){
900
fprintf(stderr, "Bad number of DH bits\n");
901
exit(EXIT_FAILURE);
902
}
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
904
break;
905
case 130: /* --priority */
906
mc.priority = arg;
907
break;
908
case ARGP_KEY_ARG:
909
argp_usage(state);
910
case ARGP_KEY_END:
911
break;
912
default:
913
return ARGP_ERR_UNKNOWN;
914
}
915
return 0;
916
}
917
918
struct argp argp = { .options = options, .parser = parse_opt,
919
.args_doc = "",
920
.doc = "Mandos client -- Get and decrypt"
921
" passwords from a Mandos server" };
922
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
923
if(ret == ARGP_ERR_UNKNOWN){
924
fprintf(stderr, "Unknown error while parsing arguments\n");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
}
929
930
/* If the interface is down, bring it up */
931
{
932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
933
if(sd < 0) {
934
perror("socket");
935
exitcode = EXIT_FAILURE;
936
goto end;
937
}
938
strcpy(network.ifr_name, interface);
939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCGIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
if((network.ifr_flags & IFF_UP) == 0){
946
network.ifr_flags |= IFF_UP;
947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
948
if(ret == -1){
949
perror("ioctl SIOCSIFFLAGS");
950
exitcode = EXIT_FAILURE;
951
goto end;
952
}
953
}
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
955
if(ret == -1){
956
perror("close");
957
}
958
}
959
960
uid = getuid();
961
gid = getgid();
962
963
ret = setuid(uid);
964
if(ret == -1){
965
perror("setuid");
966
}
967
968
setgid(gid);
969
if(ret == -1){
970
perror("setgid");
971
}
972
973
ret = init_gnutls_global(&mc, pubkey, seckey);
974
if(ret == -1){
975
fprintf(stderr, "init_gnutls_global failed\n");
976
exitcode = EXIT_FAILURE;
977
goto end;
978
} else {
979
gnutls_initialized = true;
980
}
981
982
if(mkdtemp(tempdir) == NULL){
983
perror("mkdtemp");
984
tempdir[0] = '\0';
985
goto end;
986
}
987
988
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
989
fprintf(stderr, "init_gpgme failed\n");
990
exitcode = EXIT_FAILURE;
991
goto end;
992
} else {
993
gpgme_initialized = true;
994
}
995
1006
AvahiSServiceBrowser *sb = NULL;
1007
int error;
1008
int ret;
1009
intmax_t tmpmax;
1010
char *tmp;
1011
int exitcode = EXIT_SUCCESS;
1012
const char *interface = "eth0";
1013
struct ifreq network;
1014
int sd = -1;
1015
bool take_down_interface = false;
1016
uid_t uid;
1017
gid_t gid;
1018
char *connect_to = NULL;
1019
char tempdir[] = "/tmp/mandosXXXXXX";
1020
bool tempdir_created = false;
1021
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1022
const char *seckey = PATHDIR "/" SECKEY;
1023
const char *pubkey = PATHDIR "/" PUBKEY;
1024
1025
bool gnutls_initialized = false;
1026
bool gpgme_initialized = false;
1027
float delay = 2.5f;
1028
1029
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1030
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1031
1032
uid = getuid();
1033
gid = getgid();
1034
1035
/* Lower any group privileges we might have, just to be safe */
1036
errno = 0;
1037
ret = setgid(gid);
1038
if(ret == -1){
1039
perror("setgid");
1040
}
1041
1042
/* Lower user privileges (temporarily) */
1043
errno = 0;
1044
ret = seteuid(uid);
1045
if(ret == -1){
1046
perror("seteuid");
1047
}
1048
1049
if(quit_now){
1050
goto end;
1051
}
1052
1053
{
1054
struct argp_option options[] = {
1055
{ .name = "debug", .key = 128,
1056
.doc = "Debug mode", .group = 3 },
1057
{ .name = "connect", .key = 'c',
1058
.arg = "ADDRESS:PORT",
1059
.doc = "Connect directly to a specific Mandos server",
1060
.group = 1 },
1061
{ .name = "interface", .key = 'i',
1062
.arg = "NAME",
1063
.doc = "Network interface that will be used to search for"
1064
" Mandos servers",
1065
.group = 1 },
1066
{ .name = "seckey", .key = 's',
1067
.arg = "FILE",
1068
.doc = "OpenPGP secret key file base name",
1069
.group = 1 },
1070
{ .name = "pubkey", .key = 'p',
1071
.arg = "FILE",
1072
.doc = "OpenPGP public key file base name",
1073
.group = 2 },
1074
{ .name = "dh-bits", .key = 129,
1075
.arg = "BITS",
1076
.doc = "Bit length of the prime number used in the"
1077
" Diffie-Hellman key exchange",
1078
.group = 2 },
1079
{ .name = "priority", .key = 130,
1080
.arg = "STRING",
1081
.doc = "GnuTLS priority string for the TLS handshake",
1082
.group = 1 },
1083
{ .name = "delay", .key = 131,
1084
.arg = "SECONDS",
1085
.doc = "Maximum delay to wait for interface startup",
1086
.group = 2 },
1087
{ .name = NULL }
1088
};
1089
1090
error_t parse_opt(int key, char *arg,
1091
struct argp_state *state){
1092
switch(key){
1093
case 128: /* --debug */
1094
debug = true;
1095
break;
1096
case 'c': /* --connect */
1097
connect_to = arg;
1098
break;
1099
case 'i': /* --interface */
1100
interface = arg;
1101
break;
1102
case 's': /* --seckey */
1103
seckey = arg;
1104
break;
1105
case 'p': /* --pubkey */
1106
pubkey = arg;
1107
break;
1108
case 129: /* --dh-bits */
1109
errno = 0;
1110
tmpmax = strtoimax(arg, &tmp, 10);
1111
if(errno != 0 or tmp == arg or *tmp != '\0'
1112
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1113
fprintf(stderr, "Bad number of DH bits\n");
1114
exit(EXIT_FAILURE);
1115
}
1116
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1117
break;
1118
case 130: /* --priority */
1119
mc.priority = arg;
1120
break;
1121
case 131: /* --delay */
1122
errno = 0;
1123
delay = strtof(arg, &tmp);
1124
if(errno != 0 or tmp == arg or *tmp != '\0'){
1125
fprintf(stderr, "Bad delay\n");
1126
exit(EXIT_FAILURE);
1127
}
1128
break;
1129
case ARGP_KEY_ARG:
1130
argp_usage(state);
1131
case ARGP_KEY_END:
1132
break;
1133
default:
1134
return ARGP_ERR_UNKNOWN;
1135
}
1136
return 0;
1137
}
1138
1139
struct argp argp = { .options = options, .parser = parse_opt,
1140
.args_doc = "",
1141
.doc = "Mandos client -- Get and decrypt"
1142
" passwords from a Mandos server" };
1143
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1144
if(ret == ARGP_ERR_UNKNOWN){
1145
fprintf(stderr, "Unknown error while parsing arguments\n");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
1151
if(not debug){
1152
avahi_set_log_function(empty_log);
1153
}
1154
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
from the signal handler */
1157
/* Initialize the pseudo-RNG for Avahi */
1158
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
1166
sigemptyset(&sigterm_action.sa_mask);
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1177
goto end;
1178
}
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
/* Need to check if the handler is SIG_IGN before handling:
1186
| [[info:libc:Initial Signal Actions]] |
1187
| [[info:libc:Basic Signal Handling]] |
1188
*/
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1206
}
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
}
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1219
}
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
}
1228
1229
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
996
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
997
1232
if(if_index == 0){
998
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
999
exit(EXIT_FAILURE);
1000
}
1001
1002
if(connect_to != NULL){
1003
/* Connect directly, do not use Zeroconf */
1004
/* (Mainly meant for debugging) */
1005
char *address = strrchr(connect_to, ':');
1006
if(address == NULL){
1007
fprintf(stderr, "No colon in address\n");
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
uint16_t port;
1012
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1013
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1014
or address[numchars+1] != '\0'){
1015
fprintf(stderr, "Bad port number\n");
1016
exitcode = EXIT_FAILURE;
1017
goto end;
1018
}
1019
port = (uint16_t)tmpmax;
1020
*address = '\0';
1021
address = connect_to;
1022
ret = start_mandos_communication(address, port, if_index, &mc);
1023
if(ret < 0){
1024
exitcode = EXIT_FAILURE;
1025
} else {
1026
exitcode = EXIT_SUCCESS;
1027
}
1028
goto end;
1029
}
1030
1031
if(not debug){
1032
avahi_set_log_function(empty_log);
1033
}
1034
1035
/* Initialize the pseudo-RNG for Avahi */
1036
srand((unsigned int) time(NULL));
1037
1038
/* Allocate main Avahi loop object */
1039
mc.simple_poll = avahi_simple_poll_new();
1040
if(mc.simple_poll == NULL) {
1041
fprintf(stderr, "Avahi: Failed to create simple poll"
1042
" object.\n");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
1047
{
1048
AvahiServerConfig config;
1049
/* Do not publish any local Zeroconf records */
1050
avahi_server_config_init(&config);
1051
config.publish_hinfo = 0;
1052
config.publish_addresses = 0;
1053
config.publish_workstation = 0;
1054
config.publish_domain = 0;
1055
1056
/* Allocate a new server */
1057
mc.server = avahi_server_new(avahi_simple_poll_get
1058
(mc.simple_poll), &config, NULL,
1059
NULL, &error);
1060
1061
/* Free the Avahi configuration data */
1062
avahi_server_config_free(&config);
1063
}
1064
1065
/* Check if creating the Avahi server object succeeded */
1066
if(mc.server == NULL) {
1067
fprintf(stderr, "Failed to create Avahi server: %s\n",
1068
avahi_strerror(error));
1069
exitcode = EXIT_FAILURE;
1070
goto end;
1071
}
1072
1073
/* Create the Avahi service browser */
1074
sb = avahi_s_service_browser_new(mc.server, if_index,
1075
AVAHI_PROTO_INET6,
1076
"_mandos._tcp", NULL, 0,
1077
browse_callback, &mc);
1078
if(sb == NULL) {
1079
fprintf(stderr, "Failed to create service browser: %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1084
1085
/* Run the main loop */
1086
1087
if(debug){
1088
fprintf(stderr, "Starting Avahi loop search\n");
1089
}
1090
1091
avahi_simple_poll_loop(mc.simple_poll);
1092
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1249
#ifdef __linux__
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
messages to mess up the prompt */
1252
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1254
if(ret == -1){
1255
restore_loglevel = false;
1256
perror("klogctl");
1257
}
1258
#endif /* __linux__ */
1259
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1264
#ifdef __linux__
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1267
if(ret == -1){
1268
perror("klogctl");
1269
}
1270
}
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1278
goto end;
1279
}
1280
strcpy(network.ifr_name, interface);
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1284
#ifdef __linux__
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1287
if(ret == -1){
1288
perror("klogctl");
1289
}
1290
}
1291
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1299
goto end;
1300
}
1301
if((network.ifr_flags & IFF_UP) == 0){
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
if(ret == -1){
1306
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1309
#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);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
}
1326
/* sleep checking until interface is running */
1327
for(int i=0; i < delay * 4; i++){
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1331
} else if(network.ifr_flags & IFF_RUNNING){
1332
break;
1333
}
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
ret = nanosleep(&sleeptime, NULL);
1336
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1338
}
1339
}
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1346
}
1347
#ifdef __linux__
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1351
if(ret == -1){
1352
perror("klogctl");
1353
}
1354
}
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
1371
}
1372
1373
if(quit_now){
1374
goto end;
1375
}
1376
1377
ret = init_gnutls_global(pubkey, seckey);
1378
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
1381
goto end;
1382
} else {
1383
gnutls_initialized = true;
1384
}
1385
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
1404
goto end;
1405
} else {
1406
gpgme_initialized = true;
1407
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1413
if(connect_to != NULL){
1414
/* Connect directly, do not use Zeroconf */
1415
/* (Mainly meant for debugging) */
1416
char *address = strrchr(connect_to, ':');
1417
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
1420
goto end;
1421
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1427
uint16_t port;
1428
errno = 0;
1429
tmpmax = strtoimax(address+1, &tmp, 10);
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
1434
goto end;
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1441
port = (uint16_t)tmpmax;
1442
*address = '\0';
1443
address = connect_to;
1444
/* Colon in address indicates IPv6 */
1445
int af;
1446
if(strchr(address, ':') != NULL){
1447
af = AF_INET6;
1448
} else {
1449
af = AF_INET;
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
1460
exitcode = EXIT_SUCCESS;
1461
}
1462
goto end;
1463
}
1464
1465
if(quit_now){
1466
goto end;
1467
}
1468
1469
{
1470
AvahiServerConfig config;
1471
/* Do not publish any local Zeroconf records */
1472
avahi_server_config_init(&config);
1473
config.publish_hinfo = 0;
1474
config.publish_addresses = 0;
1475
config.publish_workstation = 0;
1476
config.publish_domain = 0;
1477
1478
/* Allocate a new server */
1479
mc.server = avahi_server_new(avahi_simple_poll_get
1480
(mc.simple_poll), &config, NULL,
1481
NULL, &error);
1482
1483
/* Free the Avahi configuration data */
1484
avahi_server_config_free(&config);
1485
}
1486
1487
/* Check if creating the Avahi server object succeeded */
1488
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
1492
goto end;
1493
}
1494
1495
if(quit_now){
1496
goto end;
1497
}
1498
1499
/* Create the Avahi service browser */
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
NULL, 0, browse_callback, NULL);
1503
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
1507
goto end;
1508
}
1509
1510
if(quit_now){
1511
goto end;
1512
}
1513
1514
/* Run the main loop */
1515
1516
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
1521
1093
1522
end:
1094
1095
if(debug){
1096
fprintf(stderr, "%s exiting\n", argv[0]);
1097
}
1098
1099
/* Cleanup things */
1100
if(sb != NULL)
1101
avahi_s_service_browser_free(sb);
1102
1103
if(mc.server != NULL)
1104
avahi_server_free(mc.server);
1105
1106
if(mc.simple_poll != NULL)
1107
avahi_simple_poll_free(mc.simple_poll);
1108
1109
if(gnutls_initialized){
1110
gnutls_certificate_free_credentials(mc.cred);
1111
gnutls_global_deinit();
1112
gnutls_dh_params_deinit(mc.dh_params);
1113
}
1114
1115
if(gpgme_initialized){
1116
gpgme_release(mc.ctx);
1117
}
1118
1119
/* Removes the temp directory used by GPGME */
1120
if(tempdir[0] != '\0'){
1121
DIR *d;
1122
struct dirent *direntry;
1123
d = opendir(tempdir);
1124
if(d == NULL){
1125
if(errno != ENOENT){
1126
perror("opendir");
1127
}
1128
} else {
1129
while(true){
1130
direntry = readdir(d);
1131
if(direntry == NULL){
1132
break;
1133
}
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1139
continue;
1140
}
1141
char *fullname = NULL;
1142
ret = asprintf(&fullname, "%s/%s", tempdir,
1143
direntry->d_name);
1144
if(ret < 0){
1145
perror("asprintf");
1146
continue;
1147
}
1148
ret = remove(fullname);
1149
if(ret == -1){
1150
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1151
strerror(errno));
1152
}
1153
free(fullname);
1154
}
1155
closedir(d);
1156
}
1157
ret = rmdir(tempdir);
1158
if(ret == -1 and errno != ENOENT){
1159
perror("rmdir");
1160
}
1161
}
1162
1163
return exitcode;
1523
1524
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
1526
}
1527
1528
/* Cleanup things */
1529
if(sb != NULL)
1530
avahi_s_service_browser_free(sb);
1531
1532
if(mc.server != NULL)
1533
avahi_server_free(mc.server);
1534
1535
if(mc.simple_poll != NULL)
1536
avahi_simple_poll_free(mc.simple_poll);
1537
1538
if(gnutls_initialized){
1539
gnutls_certificate_free_credentials(mc.cred);
1540
gnutls_global_deinit();
1541
gnutls_dh_params_deinit(mc.dh_params);
1542
}
1543
1544
if(gpgme_initialized){
1545
gpgme_release(mc.ctx);
1546
}
1547
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1580
/* Removes the temp directory used by GPGME */
1581
if(tempdir_created){
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
1602
char *fullname = NULL;
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
direntry->d_name);
1605
if(ret < 0){
1606
perror("asprintf");
1607
continue;
1608
}
1609
ret = remove(fullname);
1610
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
1613
}
1614
free(fullname);
1615
}
1616
closedir(d);
1617
}
1618
ret = rmdir(tempdir);
1619
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
1621
}
1622
}
1623
1624
if(quit_now){
1625
sigemptyset(&old_sigterm_action.sa_mask);
1626
old_sigterm_action.sa_handler = SIG_DFL;
1627
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1628
if(ret == -1){
1629
perror("sigaction");
1630
}
1631
raise(signal_received);
1632
}
1633
1634
return exitcode;
1164
1635
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0