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- Committer: Teddy Hogeborn
- Date: 2009-09-08 06:28:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908062820-xgkdkrnvuze9vc72
* debian/mandos-client.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
- 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 */
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
53
56
#include <sys/stat.h> /* open() */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
58
inet_pton(), connect() */
57
59
#include <fcntl.h> /* open() */
58
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
61
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
64
#include <assert.h> /* assert() */
62
65
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
64
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
68
SIOCSIFFLAGS, if_indextoname(),
66
69
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
68
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
70
75
setgid() */
71
76
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
77
#include <iso646.h> /* not, or, and */
73
78
#include <argp.h> /* struct argp_option, error_t, struct
74
79
argp_state, struct argp,
75
80
argp_parse(), ARGP_KEY_ARG,
76
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__ */
77
89
78
90
/* Avahi */
79
91
/* All Avahi types, constants and functions
125
137
gpgme_ctx_t ctx;
126
138
} mandos_context;
127
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
128
145
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
131
148
* "buffer_length" is how much is already used.
132
149
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
134
151
size_t buffer_capacity){
135
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
162
/*
146
163
* Initialize GPGME.
147
164
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
149
166
const char *pubkey, const char *tempdir){
150
int ret;
151
167
gpgme_error_t rc;
152
168
gpgme_engine_info_t engine_info;
153
169
154
170
155
171
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
172
* Helper function to insert pub and seckey to the engine keyring.
157
173
*/
158
174
bool import_key(const char *filename){
175
int ret;
159
176
int fd;
160
177
gpgme_data_t pgp_data;
161
178
172
189
return false;
173
190
}
174
191
175
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
176
193
if(rc != GPG_ERR_NO_ERROR){
177
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
195
gpgme_strsource(rc), gpgme_strerror(rc));
188
205
}
189
206
190
207
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
208
fprintf(stderr, "Initializing GPGME\n");
192
209
}
193
210
194
211
/* Init GPGME */
221
238
}
222
239
223
240
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
225
242
if(rc != GPG_ERR_NO_ERROR){
226
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
244
gpgme_strsource(rc), gpgme_strerror(rc));
232
249
return false;
233
250
}
234
251
235
return true;
252
return true;
236
253
}
237
254
238
255
/*
239
256
* Decrypt OpenPGP data.
240
257
* Returns -1 on error
241
258
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
260
size_t crypto_size,
245
261
char **plaintext){
246
262
gpgme_data_t dh_crypto, dh_plain;
273
289
274
290
/* Decrypt data from the cryptotext data buffer to the plaintext
275
291
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
277
293
if(rc != GPG_ERR_NO_ERROR){
278
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
295
gpgme_strsource(rc), gpgme_strerror(rc));
280
296
plaintext_length = -1;
281
297
if(debug){
282
298
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
284
300
if(result == NULL){
285
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
302
} else {
293
309
}
294
310
gpgme_recipient_t recipient;
295
311
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
306
320
}
307
321
}
308
322
}
322
336
323
337
*plaintext = NULL;
324
338
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
326
340
(size_t)plaintext_length,
327
341
plaintext_capacity);
328
342
if(plaintext_capacity == 0){
329
perror("adjustbuffer");
343
perror("incbuffer");
330
344
plaintext_length = -1;
331
345
goto decrypt_end;
332
346
}
364
378
return plaintext_length;
365
379
}
366
380
367
static const char * safer_gnutls_strerror(int value) {
381
static const char * safer_gnutls_strerror(int value){
368
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
383
-Wunreachable-code */
370
384
if(ret == NULL)
378
392
fprintf(stderr, "GnuTLS: %s", string);
379
393
}
380
394
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
383
396
const char *seckeyfilename){
384
397
int ret;
385
398
388
401
}
389
402
390
403
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
404
if(ret != GNUTLS_E_SUCCESS){
392
405
fprintf(stderr, "GnuTLS global_init: %s\n",
393
406
safer_gnutls_strerror(ret));
394
407
return -1;
403
416
}
404
417
405
418
/* OpenPGP credentials */
406
gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
407
420
if(ret != GNUTLS_E_SUCCESS){
408
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
422
from
423
-Wunreachable-code
424
*/
412
425
safer_gnutls_strerror(ret));
413
426
gnutls_global_deinit();
414
427
return -1;
421
434
}
422
435
423
436
ret = gnutls_certificate_set_openpgp_key_file
424
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
425
438
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
427
440
fprintf(stderr,
428
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
433
446
}
434
447
435
448
/* GnuTLS server initialization */
436
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
438
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
452
" %s\n", safer_gnutls_strerror(ret));
440
453
goto globalfail;
441
454
}
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
444
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
458
safer_gnutls_strerror(ret));
446
459
goto globalfail;
447
460
}
448
461
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
450
463
451
464
return 0;
452
465
453
466
globalfail:
454
467
455
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
456
469
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
458
471
return -1;
459
472
}
460
473
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
463
475
int ret;
464
476
/* GnuTLS session creation */
465
477
ret = gnutls_init(session, GNUTLS_SERVER);
470
482
471
483
{
472
484
const char *err;
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
475
487
fprintf(stderr, "Syntax error at: %s\n", err);
476
488
fprintf(stderr, "GnuTLS error: %s\n",
477
489
safer_gnutls_strerror(ret));
481
493
}
482
494
483
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
486
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
499
safer_gnutls_strerror(ret));
488
500
gnutls_deinit(*session);
493
505
gnutls_certificate_server_set_request(*session,
494
506
GNUTLS_CERT_IGNORE);
495
507
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
497
509
498
510
return 0;
499
511
}
502
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
503
515
__attribute__((unused)) const char *txt){}
504
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
505
520
/* Called when a Mandos server is found */
506
521
static int start_mandos_communication(const char *ip, uint16_t port,
507
522
AvahiIfIndex if_index,
508
mandos_context *mc){
509
int ret, tcp_sd;
523
int af){
524
int ret, tcp_sd = -1;
510
525
ssize_t sret;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
512
530
char *buffer = NULL;
513
531
char *decrypted_buffer;
514
532
size_t buffer_length = 0;
515
533
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
517
534
size_t written;
518
535
int retval = 0;
519
char interface[IF_NAMESIZE];
520
536
gnutls_session_t session;
521
522
ret = init_gnutls_session(mc, &session);
537
int pf; /* Protocol family */
538
539
if(quit_now){
540
return -1;
541
}
542
543
switch(af){
544
case AF_INET6:
545
pf = PF_INET6;
546
break;
547
case AF_INET:
548
pf = PF_INET;
549
break;
550
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
552
return -1;
553
}
554
555
ret = init_gnutls_session(&session);
523
556
if(ret != 0){
524
557
return -1;
525
558
}
526
559
527
560
if(debug){
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
529
562
"\n", ip, port);
530
563
}
531
564
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
if(tcp_sd < 0){
534
567
perror("socket");
535
return -1;
568
retval = -1;
569
goto mandos_end;
536
570
}
537
571
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
572
if(quit_now){
573
goto mandos_end;
544
574
}
545
575
546
576
memset(&to, 0, sizeof(to));
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
577
if(af == AF_INET6){
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
580
} else { /* IPv4 */
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
583
}
551
584
if(ret < 0 ){
552
585
perror("inet_pton");
553
return -1;
586
retval = -1;
587
goto mandos_end;
554
588
}
555
589
if(ret == 0){
556
590
fprintf(stderr, "Bad address: %s\n", ip);
557
return -1;
591
retval = -1;
592
goto mandos_end;
558
593
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
594
if(af == AF_INET6){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
602
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
606
goto mandos_end;
607
}
608
/* Set the network interface number as scope */
609
to.in6.sin6_scope_id = (uint32_t)if_index;
610
}
611
} else {
612
to.in.sin_port = htons(port); /* Spurious warnings from
560
613
-Wconversion and
561
614
-Wunreachable-code */
615
}
562
616
563
to.in6.sin6_scope_id = (uint32_t)if_index;
617
if(quit_now){
618
goto mandos_end;
619
}
564
620
565
621
if(debug){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
char interface[IF_NAMESIZE];
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
626
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
629
}
630
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
633
}
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
if(pcret == NULL){
571
645
perror("inet_ntop");
572
646
} else {
573
647
if(strcmp(addrstr, ip) != 0){
576
650
}
577
651
}
578
652
579
ret = connect(tcp_sd, &to.in, sizeof(to));
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
580
662
if(ret < 0){
581
663
perror("connect");
582
return -1;
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
583
670
}
584
671
585
672
const char *out = mandos_protocol_version;
604
691
break;
605
692
}
606
693
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
607
698
}
608
699
609
700
if(debug){
610
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
702
}
612
703
704
if(quit_now){
705
goto mandos_end;
706
}
707
613
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
709
615
do{
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
616
715
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
617
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
720
619
721
if(ret != GNUTLS_E_SUCCESS){
628
730
/* Read OpenPGP packet that contains the wanted password */
629
731
630
732
if(debug){
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
632
734
ip);
633
735
}
634
736
635
737
while(true){
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
637
744
buffer_capacity);
638
745
if(buffer_capacity == 0){
639
perror("adjustbuffer");
746
perror("incbuffer");
640
747
retval = -1;
641
748
goto mandos_end;
642
749
}
643
750
751
if(quit_now){
752
goto mandos_end;
753
}
754
644
755
sret = gnutls_record_recv(session, buffer+buffer_length,
645
756
BUFFER_SIZE);
646
757
if(sret == 0){
652
763
case GNUTLS_E_AGAIN:
653
764
break;
654
765
case GNUTLS_E_REHANDSHAKE:
655
do{
766
do {
656
767
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
657
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
773
if(ret < 0){
659
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
678
793
fprintf(stderr, "Closing TLS session\n");
679
794
}
680
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
681
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
682
801
802
if(quit_now){
803
goto mandos_end;
804
}
805
683
806
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
807
ssize_t decrypted_buffer_size;
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
809
buffer_length,
686
810
&decrypted_buffer);
687
811
if(decrypted_buffer_size >= 0){
812
688
813
written = 0;
689
814
while(written < (size_t) decrypted_buffer_size){
815
if(quit_now){
816
goto mandos_end;
817
}
818
690
819
ret = (int)fwrite(decrypted_buffer + written, 1,
691
820
(size_t)decrypted_buffer_size - written,
692
821
stdout);
712
841
713
842
mandos_end:
714
843
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
716
847
if(ret == -1){
717
848
perror("close");
718
849
}
719
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
720
854
return retval;
721
855
}
722
856
723
857
static void resolve_callback(AvahiSServiceResolver *r,
724
858
AvahiIfIndex interface,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
AvahiProtocol proto,
726
860
AvahiResolverEvent event,
727
861
const char *name,
728
862
const char *type,
733
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
734
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
735
869
flags,
736
void* userdata) {
737
mandos_context *mc = userdata;
870
AVAHI_GCC_UNUSED void* userdata){
738
871
assert(r);
739
872
740
873
/* Called whenever a service has been resolved successfully or
741
874
timed out */
742
875
743
switch(event) {
876
if(quit_now){
877
return;
878
}
879
880
switch(event){
744
881
default:
745
882
case AVAHI_RESOLVER_FAILURE:
746
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
748
avahi_strerror(avahi_server_errno(mc->server)));
885
avahi_strerror(avahi_server_errno(mc.server)));
749
886
break;
750
887
751
888
case AVAHI_RESOLVER_FOUND:
757
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
895
ip, (intmax_t)interface, port);
759
896
}
760
int ret = start_mandos_communication(ip, port, interface, mc);
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
761
899
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
900
avahi_simple_poll_quit(mc.simple_poll);
763
901
}
764
902
}
765
903
}
766
904
avahi_s_service_resolver_free(r);
767
905
}
768
906
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
907
static void browse_callback(AvahiSServiceBrowser *b,
908
AvahiIfIndex interface,
909
AvahiProtocol protocol,
910
AvahiBrowserEvent event,
911
const char *name,
912
const char *type,
913
const char *domain,
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
915
flags,
916
AVAHI_GCC_UNUSED void* userdata){
780
917
assert(b);
781
918
782
919
/* Called whenever a new services becomes available on the LAN or
783
920
is removed from the LAN */
784
921
785
switch(event) {
922
if(quit_now){
923
return;
924
}
925
926
switch(event){
786
927
default:
787
928
case AVAHI_BROWSER_FAILURE:
788
929
789
930
fprintf(stderr, "(Avahi browser) %s\n",
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
792
933
return;
793
934
794
935
case AVAHI_BROWSER_NEW:
797
938
the callback function is called the Avahi server will free the
798
939
resolver for us. */
799
940
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
804
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
805
name, avahi_strerror(avahi_server_errno(mc->server)));
945
name, avahi_strerror(avahi_server_errno(mc.server)));
806
946
break;
807
947
808
948
case AVAHI_BROWSER_REMOVE:
817
957
}
818
958
}
819
959
960
/* stop main loop after sigterm has been called */
961
static void handle_sigterm(int sig){
962
if(quit_now){
963
return;
964
}
965
quit_now = 1;
966
signal_received = sig;
967
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
972
}
973
820
974
int main(int argc, char *argv[]){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
829
int sd;
830
uid_t uid;
831
gid_t gid;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
844
{
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
851
.group = 1 },
852
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
856
.group = 1 },
857
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
860
.group = 1 },
861
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
864
.group = 2 },
865
{ .name = "dh-bits", .key = 129,
866
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
869
.group = 2 },
870
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
874
{ .name = NULL }
875
};
876
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
881
debug = true;
882
break;
883
case 'c': /* --connect */
884
connect_to = arg;
885
break;
886
case 'i': /* --interface */
887
interface = arg;
888
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
900
exit(EXIT_FAILURE);
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
break;
904
case 130: /* --priority */
905
mc.priority = arg;
906
break;
907
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
910
break;
911
default:
912
return ARGP_ERR_UNKNOWN;
913
}
914
return 0;
915
}
916
917
struct argp argp = { .options = options, .parser = parse_opt,
918
.args_doc = "",
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
959
uid = getuid();
960
gid = getgid();
961
962
ret = setuid(uid);
963
if(ret == -1){
964
perror("setuid");
965
}
966
967
setgid(gid);
968
if(ret == -1){
969
perror("setgid");
970
}
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
975
AvahiSServiceBrowser *sb = NULL;
976
int error;
977
int ret;
978
intmax_t tmpmax;
979
char *tmp;
980
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
991
const char *seckey = PATHDIR "/" SECKEY;
992
const char *pubkey = PATHDIR "/" PUBKEY;
993
994
bool gnutls_initialized = false;
995
bool gpgme_initialized = false;
996
float delay = 2.5f;
997
998
struct sigaction old_sigterm_action;
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
1001
{
1002
struct argp_option options[] = {
1003
{ .name = "debug", .key = 128,
1004
.doc = "Debug mode", .group = 3 },
1005
{ .name = "connect", .key = 'c',
1006
.arg = "ADDRESS:PORT",
1007
.doc = "Connect directly to a specific Mandos server",
1008
.group = 1 },
1009
{ .name = "interface", .key = 'i',
1010
.arg = "NAME",
1011
.doc = "Network interface that will be used to search for"
1012
" Mandos servers",
1013
.group = 1 },
1014
{ .name = "seckey", .key = 's',
1015
.arg = "FILE",
1016
.doc = "OpenPGP secret key file base name",
1017
.group = 1 },
1018
{ .name = "pubkey", .key = 'p',
1019
.arg = "FILE",
1020
.doc = "OpenPGP public key file base name",
1021
.group = 2 },
1022
{ .name = "dh-bits", .key = 129,
1023
.arg = "BITS",
1024
.doc = "Bit length of the prime number used in the"
1025
" Diffie-Hellman key exchange",
1026
.group = 2 },
1027
{ .name = "priority", .key = 130,
1028
.arg = "STRING",
1029
.doc = "GnuTLS priority string for the TLS handshake",
1030
.group = 1 },
1031
{ .name = "delay", .key = 131,
1032
.arg = "SECONDS",
1033
.doc = "Maximum delay to wait for interface startup",
1034
.group = 2 },
1035
{ .name = NULL }
1036
};
1037
1038
error_t parse_opt(int key, char *arg,
1039
struct argp_state *state){
1040
switch(key){
1041
case 128: /* --debug */
1042
debug = true;
1043
break;
1044
case 'c': /* --connect */
1045
connect_to = arg;
1046
break;
1047
case 'i': /* --interface */
1048
interface = arg;
1049
break;
1050
case 's': /* --seckey */
1051
seckey = arg;
1052
break;
1053
case 'p': /* --pubkey */
1054
pubkey = arg;
1055
break;
1056
case 129: /* --dh-bits */
1057
errno = 0;
1058
tmpmax = strtoimax(arg, &tmp, 10);
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1063
}
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
break;
1066
case 130: /* --priority */
1067
mc.priority = arg;
1068
break;
1069
case 131: /* --delay */
1070
errno = 0;
1071
delay = strtof(arg, &tmp);
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1080
break;
1081
default:
1082
return ARGP_ERR_UNKNOWN;
1083
}
1084
return 0;
1085
}
1086
1087
struct argp argp = { .options = options, .parser = parse_opt,
1088
.args_doc = "",
1089
.doc = "Mandos client -- Get and decrypt"
1090
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
1097
}
1098
1099
if(not debug){
1100
avahi_set_log_function(empty_log);
1101
}
1102
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
from the signal handler */
1105
/* Initialize the pseudo-RNG for Avahi */
1106
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
}
1113
1114
sigemptyset(&sigterm_action.sa_mask);
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1131
goto end;
1132
}
1133
/* Need to check if the handler is SIG_IGN before handling:
1134
| [[info:libc:Initial Signal Actions]] |
1135
| [[info:libc:Basic Signal Handling]] |
1136
*/
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1141
}
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1154
}
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1160
goto end;
1161
}
1162
}
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
995
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
1180
if(if_index == 0){
997
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
exit(EXIT_FAILURE);
999
}
1000
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
port = (uint16_t)tmpmax;
1019
*address = '\0';
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1022
if(ret < 0){
1023
exitcode = EXIT_FAILURE;
1024
} else {
1025
exitcode = EXIT_SUCCESS;
1026
}
1027
goto end;
1028
}
1029
1030
if(not debug){
1031
avahi_set_log_function(empty_log);
1032
}
1033
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1036
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
" object.\n");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
1046
{
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1054
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1058
NULL, &error);
1059
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1062
}
1063
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1074
AVAHI_PROTO_INET6,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1077
if(sb == NULL) {
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1081
goto end;
1082
}
1083
1084
/* Run the main loop */
1085
1086
if(debug){
1087
fprintf(stderr, "Starting Avahi loop search\n");
1088
}
1089
1090
avahi_simple_poll_loop(mc.simple_poll);
1091
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
goto end;
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
break;
1256
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
1300
ret = seteuid(uid);
1301
if(ret == -1){
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
1309
}
1310
}
1311
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
ret = init_gnutls_global(pubkey, seckey);
1317
if(ret == -1){
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
1320
goto end;
1321
} else {
1322
gnutls_initialized = true;
1323
}
1324
1325
if(quit_now){
1326
goto end;
1327
}
1328
1329
tempdir_created = true;
1330
if(mkdtemp(tempdir) == NULL){
1331
tempdir_created = false;
1332
perror("mkdtemp");
1333
goto end;
1334
}
1335
1336
if(quit_now){
1337
goto end;
1338
}
1339
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
1343
goto end;
1344
} else {
1345
gpgme_initialized = true;
1346
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
if(connect_to != NULL){
1353
/* Connect directly, do not use Zeroconf */
1354
/* (Mainly meant for debugging) */
1355
char *address = strrchr(connect_to, ':');
1356
if(address == NULL){
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
1359
goto end;
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
uint16_t port;
1367
errno = 0;
1368
tmpmax = strtoimax(address+1, &tmp, 10);
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1370
or tmpmax != (uint16_t)tmpmax){
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
1373
goto end;
1374
}
1375
1376
if(quit_now){
1377
goto end;
1378
}
1379
1380
port = (uint16_t)tmpmax;
1381
*address = '\0';
1382
address = connect_to;
1383
/* Colon in address indicates IPv6 */
1384
int af;
1385
if(strchr(address, ':') != NULL){
1386
af = AF_INET6;
1387
} else {
1388
af = AF_INET;
1389
}
1390
1391
if(quit_now){
1392
goto end;
1393
}
1394
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
1399
exitcode = EXIT_SUCCESS;
1400
}
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
{
1409
AvahiServerConfig config;
1410
/* Do not publish any local Zeroconf records */
1411
avahi_server_config_init(&config);
1412
config.publish_hinfo = 0;
1413
config.publish_addresses = 0;
1414
config.publish_workstation = 0;
1415
config.publish_domain = 0;
1416
1417
/* Allocate a new server */
1418
mc.server = avahi_server_new(avahi_simple_poll_get
1419
(mc.simple_poll), &config, NULL,
1420
NULL, &error);
1421
1422
/* Free the Avahi configuration data */
1423
avahi_server_config_free(&config);
1424
}
1425
1426
/* Check if creating the Avahi server object succeeded */
1427
if(mc.server == NULL){
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
1431
goto end;
1432
}
1433
1434
if(quit_now){
1435
goto end;
1436
}
1437
1438
/* Create the Avahi service browser */
1439
sb = avahi_s_service_browser_new(mc.server, if_index,
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1441
NULL, 0, browse_callback, NULL);
1442
if(sb == NULL){
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
1446
goto end;
1447
}
1448
1449
if(quit_now){
1450
goto end;
1451
}
1452
1453
/* Run the main loop */
1454
1455
if(debug){
1456
fprintf(stderr, "Starting Avahi loop search\n");
1457
}
1458
1459
avahi_simple_poll_loop(mc.simple_poll);
1460
1092
1461
end:
1093
1094
if(debug){
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1096
}
1097
1098
/* Cleanup things */
1099
if(sb != NULL)
1100
avahi_s_service_browser_free(sb);
1101
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1157
return exitcode;
1462
1463
if(debug){
1464
fprintf(stderr, "%s exiting\n", argv[0]);
1465
}
1466
1467
/* Cleanup things */
1468
if(sb != NULL)
1469
avahi_s_service_browser_free(sb);
1470
1471
if(mc.server != NULL)
1472
avahi_server_free(mc.server);
1473
1474
if(mc.simple_poll != NULL)
1475
avahi_simple_poll_free(mc.simple_poll);
1476
1477
if(gnutls_initialized){
1478
gnutls_certificate_free_credentials(mc.cred);
1479
gnutls_global_deinit();
1480
gnutls_dh_params_deinit(mc.dh_params);
1481
}
1482
1483
if(gpgme_initialized){
1484
gpgme_release(mc.ctx);
1485
}
1486
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
1494
}
1495
if(geteuid() == 0){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1502
if(ret == -1){
1503
perror("ioctl SIOCSIFFLAGS");
1504
}
1505
}
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1507
if(ret == -1){
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1511
errno = 0;
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
1515
}
1516
}
1517
}
1518
1519
/* Removes the temp directory used by GPGME */
1520
if(tempdir_created){
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1526
perror("opendir");
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
1541
char *fullname = NULL;
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
1543
direntry->d_name);
1544
if(ret < 0){
1545
perror("asprintf");
1546
continue;
1547
}
1548
ret = remove(fullname);
1549
if(ret == -1){
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
1552
}
1553
free(fullname);
1554
}
1555
closedir(d);
1556
}
1557
ret = rmdir(tempdir);
1558
if(ret == -1 and errno != ENOENT){
1559
perror("rmdir");
1560
}
1561
}
1562
1563
if(quit_now){
1564
sigemptyset(&old_sigterm_action.sa_mask);
1565
old_sigterm_action.sa_handler = SIG_DFL;
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1567
if(ret == -1){
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
1571
}
1572
1573
return exitcode;
1158
1574
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0