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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(),
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
129
145
/*
130
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
131
* "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,
132
148
* "buffer_length" is how much is already used.
133
149
*/
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
135
151
size_t buffer_capacity){
136
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
137
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
146
162
/*
147
163
* Initialize GPGME.
148
164
*/
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
150
166
const char *pubkey, const char *tempdir){
151
int ret;
152
167
gpgme_error_t rc;
153
168
gpgme_engine_info_t engine_info;
154
169
155
170
156
171
/*
157
* Helper function to insert pub and seckey to the enigne keyring.
172
* Helper function to insert pub and seckey to the engine keyring.
158
173
*/
159
174
bool import_key(const char *filename){
175
int ret;
160
176
int fd;
161
177
gpgme_data_t pgp_data;
162
178
173
189
return false;
174
190
}
175
191
176
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
177
193
if(rc != GPG_ERR_NO_ERROR){
178
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
195
gpgme_strsource(rc), gpgme_strerror(rc));
189
205
}
190
206
191
207
if(debug){
192
fprintf(stderr, "Initialize gpgme\n");
208
fprintf(stderr, "Initializing GPGME\n");
193
209
}
194
210
195
211
/* Init GPGME */
222
238
}
223
239
224
240
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
226
242
if(rc != GPG_ERR_NO_ERROR){
227
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
244
gpgme_strsource(rc), gpgme_strerror(rc));
233
249
return false;
234
250
}
235
251
236
return true;
252
return true;
237
253
}
238
254
239
255
/*
240
256
* Decrypt OpenPGP data.
241
257
* Returns -1 on error
242
258
*/
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
245
260
size_t crypto_size,
246
261
char **plaintext){
247
262
gpgme_data_t dh_crypto, dh_plain;
274
289
275
290
/* Decrypt data from the cryptotext data buffer to the plaintext
276
291
data buffer */
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
278
293
if(rc != GPG_ERR_NO_ERROR){
279
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
295
gpgme_strsource(rc), gpgme_strerror(rc));
281
296
plaintext_length = -1;
282
297
if(debug){
283
298
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
285
300
if(result == NULL){
286
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
302
} else {
294
309
}
295
310
gpgme_recipient_t recipient;
296
311
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
}
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;
307
320
}
308
321
}
309
322
}
323
336
324
337
*plaintext = NULL;
325
338
while(true){
326
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
327
340
(size_t)plaintext_length,
328
341
plaintext_capacity);
329
342
if(plaintext_capacity == 0){
330
perror("adjustbuffer");
343
perror("incbuffer");
331
344
plaintext_length = -1;
332
345
goto decrypt_end;
333
346
}
365
378
return plaintext_length;
366
379
}
367
380
368
static const char * safer_gnutls_strerror(int value) {
381
static const char * safer_gnutls_strerror(int value){
369
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
383
-Wunreachable-code */
371
384
if(ret == NULL)
379
392
fprintf(stderr, "GnuTLS: %s", string);
380
393
}
381
394
382
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
384
396
const char *seckeyfilename){
385
397
int ret;
386
398
389
401
}
390
402
391
403
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
404
if(ret != GNUTLS_E_SUCCESS){
393
405
fprintf(stderr, "GnuTLS global_init: %s\n",
394
406
safer_gnutls_strerror(ret));
395
407
return -1;
404
416
}
405
417
406
418
/* OpenPGP credentials */
407
gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
408
420
if(ret != GNUTLS_E_SUCCESS){
409
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
410
* from
411
* -Wunreachable-code
412
*/
422
from
423
-Wunreachable-code
424
*/
413
425
safer_gnutls_strerror(ret));
414
426
gnutls_global_deinit();
415
427
return -1;
422
434
}
423
435
424
436
ret = gnutls_certificate_set_openpgp_key_file
425
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
426
438
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
428
440
fprintf(stderr,
429
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
446
}
435
447
436
448
/* GnuTLS server initialization */
437
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
439
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
452
" %s\n", safer_gnutls_strerror(ret));
441
453
goto globalfail;
442
454
}
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
445
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
458
safer_gnutls_strerror(ret));
447
459
goto globalfail;
448
460
}
449
461
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
451
463
452
464
return 0;
453
465
454
466
globalfail:
455
467
456
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
457
469
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
459
471
return -1;
460
472
}
461
473
462
static int init_gnutls_session(mandos_context *mc,
463
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
464
475
int ret;
465
476
/* GnuTLS session creation */
466
477
ret = gnutls_init(session, GNUTLS_SERVER);
471
482
472
483
{
473
484
const char *err;
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
476
487
fprintf(stderr, "Syntax error at: %s\n", err);
477
488
fprintf(stderr, "GnuTLS error: %s\n",
478
489
safer_gnutls_strerror(ret));
482
493
}
483
494
484
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
487
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
499
safer_gnutls_strerror(ret));
489
500
gnutls_deinit(*session);
494
505
gnutls_certificate_server_set_request(*session,
495
506
GNUTLS_CERT_IGNORE);
496
507
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
498
509
499
510
return 0;
500
511
}
503
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
504
515
__attribute__((unused)) const char *txt){}
505
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
506
520
/* Called when a Mandos server is found */
507
521
static int start_mandos_communication(const char *ip, uint16_t port,
508
522
AvahiIfIndex if_index,
509
mandos_context *mc){
510
int ret, tcp_sd;
523
int af){
524
int ret, tcp_sd = -1;
511
525
ssize_t sret;
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
513
530
char *buffer = NULL;
514
531
char *decrypted_buffer;
515
532
size_t buffer_length = 0;
516
533
size_t buffer_capacity = 0;
517
ssize_t decrypted_buffer_size;
518
534
size_t written;
519
535
int retval = 0;
520
char interface[IF_NAMESIZE];
521
536
gnutls_session_t session;
522
523
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);
524
556
if(ret != 0){
525
557
return -1;
526
558
}
527
559
528
560
if(debug){
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
530
562
"\n", ip, port);
531
563
}
532
564
533
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(tcp_sd < 0) {
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
if(tcp_sd < 0){
535
567
perror("socket");
536
return -1;
568
retval = -1;
569
goto mandos_end;
537
570
}
538
571
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);
572
if(quit_now){
573
goto mandos_end;
545
574
}
546
575
547
576
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);
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
}
552
584
if(ret < 0 ){
553
585
perror("inet_pton");
554
return -1;
586
retval = -1;
587
goto mandos_end;
555
588
}
556
589
if(ret == 0){
557
590
fprintf(stderr, "Bad address: %s\n", ip);
558
return -1;
591
retval = -1;
592
goto mandos_end;
559
593
}
560
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
561
613
-Wconversion and
562
614
-Wunreachable-code */
615
}
563
616
564
to.in6.sin6_scope_id = (uint32_t)if_index;
617
if(quit_now){
618
goto mandos_end;
619
}
565
620
566
621
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){
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){
572
645
perror("inet_ntop");
573
646
} else {
574
647
if(strcmp(addrstr, ip) != 0){
577
650
}
578
651
}
579
652
580
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
}
581
662
if(ret < 0){
582
663
perror("connect");
583
return -1;
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
584
670
}
585
671
586
672
const char *out = mandos_protocol_version;
605
691
break;
606
692
}
607
693
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
608
698
}
609
699
610
700
if(debug){
611
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
702
}
613
703
704
if(quit_now){
705
goto mandos_end;
706
}
707
614
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
709
616
do{
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
617
715
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
618
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
619
720
620
721
if(ret != GNUTLS_E_SUCCESS){
629
730
/* Read OpenPGP packet that contains the wanted password */
630
731
631
732
if(debug){
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
633
734
ip);
634
735
}
635
736
636
737
while(true){
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
638
744
buffer_capacity);
639
745
if(buffer_capacity == 0){
640
perror("adjustbuffer");
746
perror("incbuffer");
641
747
retval = -1;
642
748
goto mandos_end;
643
749
}
644
750
751
if(quit_now){
752
goto mandos_end;
753
}
754
645
755
sret = gnutls_record_recv(session, buffer+buffer_length,
646
756
BUFFER_SIZE);
647
757
if(sret == 0){
653
763
case GNUTLS_E_AGAIN:
654
764
break;
655
765
case GNUTLS_E_REHANDSHAKE:
656
do{
766
do {
657
767
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
658
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
659
773
if(ret < 0){
660
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
679
793
fprintf(stderr, "Closing TLS session\n");
680
794
}
681
795
796
if(quit_now){
797
goto mandos_end;
798
}
799
682
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
683
801
802
if(quit_now){
803
goto mandos_end;
804
}
805
684
806
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
807
ssize_t decrypted_buffer_size;
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
809
buffer_length,
687
810
&decrypted_buffer);
688
811
if(decrypted_buffer_size >= 0){
812
689
813
written = 0;
690
814
while(written < (size_t) decrypted_buffer_size){
815
if(quit_now){
816
goto mandos_end;
817
}
818
691
819
ret = (int)fwrite(decrypted_buffer + written, 1,
692
820
(size_t)decrypted_buffer_size - written,
693
821
stdout);
713
841
714
842
mandos_end:
715
843
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
717
847
if(ret == -1){
718
848
perror("close");
719
849
}
720
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
721
854
return retval;
722
855
}
723
856
724
857
static void resolve_callback(AvahiSServiceResolver *r,
725
858
AvahiIfIndex interface,
726
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
AvahiProtocol proto,
727
860
AvahiResolverEvent event,
728
861
const char *name,
729
862
const char *type,
734
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
735
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
736
869
flags,
737
void* userdata) {
738
mandos_context *mc = userdata;
870
AVAHI_GCC_UNUSED void* userdata){
739
871
assert(r);
740
872
741
873
/* Called whenever a service has been resolved successfully or
742
874
timed out */
743
875
744
switch(event) {
876
if(quit_now){
877
return;
878
}
879
880
switch(event){
745
881
default:
746
882
case AVAHI_RESOLVER_FAILURE:
747
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
748
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
749
avahi_strerror(avahi_server_errno(mc->server)));
885
avahi_strerror(avahi_server_errno(mc.server)));
750
886
break;
751
887
752
888
case AVAHI_RESOLVER_FOUND:
758
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
895
ip, (intmax_t)interface, port);
760
896
}
761
int ret = start_mandos_communication(ip, port, interface, mc);
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
762
899
if(ret == 0){
763
avahi_simple_poll_quit(mc->simple_poll);
900
avahi_simple_poll_quit(mc.simple_poll);
764
901
}
765
902
}
766
903
}
767
904
avahi_s_service_resolver_free(r);
768
905
}
769
906
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;
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){
781
917
assert(b);
782
918
783
919
/* Called whenever a new services becomes available on the LAN or
784
920
is removed from the LAN */
785
921
786
switch(event) {
922
if(quit_now){
923
return;
924
}
925
926
switch(event){
787
927
default:
788
928
case AVAHI_BROWSER_FAILURE:
789
929
790
930
fprintf(stderr, "(Avahi browser) %s\n",
791
avahi_strerror(avahi_server_errno(mc->server)));
792
avahi_simple_poll_quit(mc->simple_poll);
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
793
933
return;
794
934
795
935
case AVAHI_BROWSER_NEW:
798
938
the callback function is called the Avahi server will free the
799
939
resolver for us. */
800
940
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
802
protocol, name, type, domain,
803
AVAHI_PROTO_INET6, 0,
804
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)
805
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
806
name, avahi_strerror(avahi_server_errno(mc->server)));
945
name, avahi_strerror(avahi_server_errno(mc.server)));
807
946
break;
808
947
809
948
case AVAHI_BROWSER_REMOVE:
818
957
}
819
958
}
820
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
821
974
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
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'){
996
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
997
1180
if(if_index == 0){
998
1181
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
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
1093
1461
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;
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;
1164
1574
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0