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- Committer: Teddy Hogeborn
- Date: 2009-09-22 20:18:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20090922201843-cd5uqnthf3eegg4l
* mandos (Client.start_checker): Bug fix: Fix race condition with
short intervals.
short intervals.
- 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(), abort() */
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(),
70
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
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
145
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
147
128
148
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
131
151
* "buffer_length" is how much is already used.
132
152
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
153
size_t incbuffer(char **buffer, size_t buffer_length,
134
154
size_t buffer_capacity){
135
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
165
/*
146
166
* Initialize GPGME.
147
167
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
168
static bool init_gpgme(const char *seckey,
149
169
const char *pubkey, const char *tempdir){
150
int ret;
151
170
gpgme_error_t rc;
152
171
gpgme_engine_info_t engine_info;
153
172
154
173
155
174
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
175
* Helper function to insert pub and seckey to the engine keyring.
157
176
*/
158
177
bool import_key(const char *filename){
178
int ret;
159
179
int fd;
160
180
gpgme_data_t pgp_data;
161
181
172
192
return false;
173
193
}
174
194
175
rc = gpgme_op_import(mc->ctx, pgp_data);
195
rc = gpgme_op_import(mc.ctx, pgp_data);
176
196
if(rc != GPG_ERR_NO_ERROR){
177
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
198
gpgme_strsource(rc), gpgme_strerror(rc));
188
208
}
189
209
190
210
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
211
fprintf(stderr, "Initializing GPGME\n");
192
212
}
193
213
194
214
/* Init GPGME */
221
241
}
222
242
223
243
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
244
rc = gpgme_new(&(mc.ctx));
225
245
if(rc != GPG_ERR_NO_ERROR){
226
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
247
gpgme_strsource(rc), gpgme_strerror(rc));
232
252
return false;
233
253
}
234
254
235
return true;
255
return true;
236
256
}
237
257
238
258
/*
239
259
* Decrypt OpenPGP data.
240
260
* Returns -1 on error
241
261
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
263
size_t crypto_size,
245
264
char **plaintext){
246
265
gpgme_data_t dh_crypto, dh_plain;
273
292
274
293
/* Decrypt data from the cryptotext data buffer to the plaintext
275
294
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
277
296
if(rc != GPG_ERR_NO_ERROR){
278
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
298
gpgme_strsource(rc), gpgme_strerror(rc));
280
299
plaintext_length = -1;
281
300
if(debug){
282
301
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
302
result = gpgme_op_decrypt_result(mc.ctx);
284
303
if(result == NULL){
285
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
305
} else {
293
312
}
294
313
gpgme_recipient_t recipient;
295
314
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
}
315
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
322
recipient = recipient->next;
306
323
}
307
324
}
308
325
}
322
339
323
340
*plaintext = NULL;
324
341
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
342
plaintext_capacity = incbuffer(plaintext,
326
343
(size_t)plaintext_length,
327
344
plaintext_capacity);
328
345
if(plaintext_capacity == 0){
329
perror("adjustbuffer");
346
perror("incbuffer");
330
347
plaintext_length = -1;
331
348
goto decrypt_end;
332
349
}
364
381
return plaintext_length;
365
382
}
366
383
367
static const char * safer_gnutls_strerror(int value) {
384
static const char * safer_gnutls_strerror(int value){
368
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
386
-Wunreachable-code */
370
387
if(ret == NULL)
378
395
fprintf(stderr, "GnuTLS: %s", string);
379
396
}
380
397
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
398
static int init_gnutls_global(const char *pubkeyfilename,
383
399
const char *seckeyfilename){
384
400
int ret;
385
401
388
404
}
389
405
390
406
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
407
if(ret != GNUTLS_E_SUCCESS){
392
408
fprintf(stderr, "GnuTLS global_init: %s\n",
393
409
safer_gnutls_strerror(ret));
394
410
return -1;
403
419
}
404
420
405
421
/* OpenPGP credentials */
406
gnutls_certificate_allocate_credentials(&mc->cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
407
423
if(ret != GNUTLS_E_SUCCESS){
408
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
425
from
426
-Wunreachable-code
427
*/
412
428
safer_gnutls_strerror(ret));
413
429
gnutls_global_deinit();
414
430
return -1;
421
437
}
422
438
423
439
ret = gnutls_certificate_set_openpgp_key_file
424
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
425
441
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
442
if(ret != GNUTLS_E_SUCCESS){
427
443
fprintf(stderr,
428
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
433
449
}
434
450
435
451
/* GnuTLS server initialization */
436
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
438
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
455
" %s\n", safer_gnutls_strerror(ret));
440
456
goto globalfail;
441
457
}
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
444
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
461
safer_gnutls_strerror(ret));
446
462
goto globalfail;
447
463
}
448
464
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
450
466
451
467
return 0;
452
468
453
469
globalfail:
454
470
455
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
456
472
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
458
474
return -1;
459
475
}
460
476
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
477
static int init_gnutls_session(gnutls_session_t *session){
463
478
int ret;
464
479
/* GnuTLS session creation */
465
ret = gnutls_init(session, GNUTLS_SERVER);
480
do {
481
ret = gnutls_init(session, GNUTLS_SERVER);
482
if(quit_now){
483
return -1;
484
}
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
466
486
if(ret != GNUTLS_E_SUCCESS){
467
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
488
safer_gnutls_strerror(ret));
470
490
471
491
{
472
492
const char *err;
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
493
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
495
if(quit_now){
496
gnutls_deinit(*session);
497
return -1;
498
}
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
if(ret != GNUTLS_E_SUCCESS){
475
501
fprintf(stderr, "Syntax error at: %s\n", err);
476
502
fprintf(stderr, "GnuTLS error: %s\n",
477
503
safer_gnutls_strerror(ret));
480
506
}
481
507
}
482
508
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
509
do {
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
512
if(quit_now){
513
gnutls_deinit(*session);
514
return -1;
515
}
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
if(ret != GNUTLS_E_SUCCESS){
486
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
519
safer_gnutls_strerror(ret));
488
520
gnutls_deinit(*session);
490
522
}
491
523
492
524
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
495
526
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
497
528
498
529
return 0;
499
530
}
505
536
/* Called when a Mandos server is found */
506
537
static int start_mandos_communication(const char *ip, uint16_t port,
507
538
AvahiIfIndex if_index,
508
mandos_context *mc){
509
int ret, tcp_sd;
539
int af){
540
int ret, tcp_sd = -1;
510
541
ssize_t sret;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
512
546
char *buffer = NULL;
513
char *decrypted_buffer;
547
char *decrypted_buffer = NULL;
514
548
size_t buffer_length = 0;
515
549
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
517
550
size_t written;
518
int retval = 0;
519
char interface[IF_NAMESIZE];
551
int retval = -1;
520
552
gnutls_session_t session;
521
522
ret = init_gnutls_session(mc, &session);
553
int pf; /* Protocol family */
554
555
if(quit_now){
556
return -1;
557
}
558
559
switch(af){
560
case AF_INET6:
561
pf = PF_INET6;
562
break;
563
case AF_INET:
564
pf = PF_INET;
565
break;
566
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
568
return -1;
569
}
570
571
ret = init_gnutls_session(&session);
523
572
if(ret != 0){
524
573
return -1;
525
574
}
526
575
527
576
if(debug){
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
529
578
"\n", ip, port);
530
579
}
531
580
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
if(tcp_sd < 0){
534
583
perror("socket");
535
return -1;
584
goto mandos_end;
536
585
}
537
586
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);
587
if(quit_now){
588
goto mandos_end;
544
589
}
545
590
546
591
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);
592
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
595
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
598
}
551
599
if(ret < 0 ){
552
600
perror("inet_pton");
553
return -1;
601
goto mandos_end;
554
602
}
555
603
if(ret == 0){
556
604
fprintf(stderr, "Bad address: %s\n", ip);
557
return -1;
605
goto mandos_end;
558
606
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
607
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
615
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
618
goto mandos_end;
619
}
620
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
622
}
623
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
560
625
-Wconversion and
561
626
-Wunreachable-code */
627
}
562
628
563
to.in6.sin6_scope_id = (uint32_t)if_index;
629
if(quit_now){
630
goto mandos_end;
631
}
564
632
565
633
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){
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
char interface[IF_NAMESIZE];
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
638
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
641
}
642
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
645
}
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
571
657
perror("inet_ntop");
572
658
} else {
573
659
if(strcmp(addrstr, ip) != 0){
576
662
}
577
663
}
578
664
579
ret = connect(tcp_sd, &to.in, sizeof(to));
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
580
674
if(ret < 0){
581
675
perror("connect");
582
return -1;
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
583
681
}
584
682
585
683
const char *out = mandos_protocol_version;
590
688
out_size - written));
591
689
if(ret == -1){
592
690
perror("write");
593
retval = -1;
594
691
goto mandos_end;
595
692
}
596
693
written += (size_t)ret;
604
701
break;
605
702
}
606
703
}
704
705
if(quit_now){
706
goto mandos_end;
707
}
607
708
}
608
709
609
710
if(debug){
610
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
712
}
612
713
714
if(quit_now){
715
goto mandos_end;
716
}
717
613
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
719
615
do{
720
if(quit_now){
721
goto mandos_end;
722
}
723
724
do {
616
725
ret = gnutls_handshake(session);
726
if(quit_now){
727
goto mandos_end;
728
}
617
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
730
619
731
if(ret != GNUTLS_E_SUCCESS){
621
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
734
gnutls_perror(ret);
623
735
}
624
retval = -1;
625
736
goto mandos_end;
626
737
}
627
738
628
739
/* Read OpenPGP packet that contains the wanted password */
629
740
630
741
if(debug){
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
632
743
ip);
633
744
}
634
745
635
746
while(true){
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
747
748
if(quit_now){
749
goto mandos_end;
750
}
751
752
buffer_capacity = incbuffer(&buffer, buffer_length,
637
753
buffer_capacity);
638
754
if(buffer_capacity == 0){
639
perror("adjustbuffer");
640
retval = -1;
755
perror("incbuffer");
756
goto mandos_end;
757
}
758
759
if(quit_now){
641
760
goto mandos_end;
642
761
}
643
762
652
771
case GNUTLS_E_AGAIN:
653
772
break;
654
773
case GNUTLS_E_REHANDSHAKE:
655
do{
774
do {
656
775
ret = gnutls_handshake(session);
776
777
if(quit_now){
778
goto mandos_end;
779
}
657
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
781
if(ret < 0){
659
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
783
gnutls_perror(ret);
661
retval = -1;
662
784
goto mandos_end;
663
785
}
664
786
break;
665
787
default:
666
788
fprintf(stderr, "Unknown error while reading data from"
667
789
" encrypted session with Mandos server\n");
668
retval = -1;
669
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
670
791
goto mandos_end;
671
792
}
678
799
fprintf(stderr, "Closing TLS session\n");
679
800
}
680
801
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
do {
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
if(quit_now){
809
goto mandos_end;
810
}
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
812
683
813
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
814
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
816
buffer_length,
686
817
&decrypted_buffer);
687
818
if(decrypted_buffer_size >= 0){
819
688
820
written = 0;
689
821
while(written < (size_t) decrypted_buffer_size){
822
if(quit_now){
823
goto mandos_end;
824
}
825
690
826
ret = (int)fwrite(decrypted_buffer + written, 1,
691
827
(size_t)decrypted_buffer_size - written,
692
828
stdout);
695
831
fprintf(stderr, "Error writing encrypted data: %s\n",
696
832
strerror(errno));
697
833
}
698
retval = -1;
699
break;
834
goto mandos_end;
700
835
}
701
836
written += (size_t)ret;
702
837
}
703
free(decrypted_buffer);
704
} else {
705
retval = -1;
838
retval = 0;
706
839
}
707
} else {
708
retval = -1;
709
840
}
710
841
711
842
/* Shutdown procedure */
712
843
713
844
mandos_end:
845
free(decrypted_buffer);
714
846
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
716
850
if(ret == -1){
717
851
perror("close");
718
852
}
719
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
856
}
720
857
return retval;
721
858
}
722
859
723
860
static void resolve_callback(AvahiSServiceResolver *r,
724
861
AvahiIfIndex interface,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
862
AvahiProtocol proto,
726
863
AvahiResolverEvent event,
727
864
const char *name,
728
865
const char *type,
733
870
AVAHI_GCC_UNUSED AvahiStringList *txt,
734
871
AVAHI_GCC_UNUSED AvahiLookupResultFlags
735
872
flags,
736
void* userdata) {
737
mandos_context *mc = userdata;
873
AVAHI_GCC_UNUSED void* userdata){
738
874
assert(r);
739
875
740
876
/* Called whenever a service has been resolved successfully or
741
877
timed out */
742
878
743
switch(event) {
879
if(quit_now){
880
return;
881
}
882
883
switch(event){
744
884
default:
745
885
case AVAHI_RESOLVER_FAILURE:
746
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
748
avahi_strerror(avahi_server_errno(mc->server)));
888
avahi_strerror(avahi_server_errno(mc.server)));
749
889
break;
750
890
751
891
case AVAHI_RESOLVER_FOUND:
757
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
898
ip, (intmax_t)interface, port);
759
899
}
760
int ret = start_mandos_communication(ip, port, interface, mc);
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
761
902
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
903
avahi_simple_poll_quit(mc.simple_poll);
763
904
}
764
905
}
765
906
}
766
907
avahi_s_service_resolver_free(r);
767
908
}
768
909
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;
910
static void browse_callback(AvahiSServiceBrowser *b,
911
AvahiIfIndex interface,
912
AvahiProtocol protocol,
913
AvahiBrowserEvent event,
914
const char *name,
915
const char *type,
916
const char *domain,
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
flags,
919
AVAHI_GCC_UNUSED void* userdata){
780
920
assert(b);
781
921
782
922
/* Called whenever a new services becomes available on the LAN or
783
923
is removed from the LAN */
784
924
785
switch(event) {
925
if(quit_now){
926
return;
927
}
928
929
switch(event){
786
930
default:
787
931
case AVAHI_BROWSER_FAILURE:
788
932
789
933
fprintf(stderr, "(Avahi browser) %s\n",
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
792
936
return;
793
937
794
938
case AVAHI_BROWSER_NEW:
797
941
the callback function is called the Avahi server will free the
798
942
resolver for us. */
799
943
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
804
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
805
name, avahi_strerror(avahi_server_errno(mc->server)));
948
name, avahi_strerror(avahi_server_errno(mc.server)));
806
949
break;
807
950
808
951
case AVAHI_BROWSER_REMOVE:
817
960
}
818
961
}
819
962
963
/* stop main loop after sigterm has been called */
964
static void handle_sigterm(int sig){
965
if(quit_now){
966
return;
967
}
968
quit_now = 1;
969
signal_received = sig;
970
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
975
}
976
820
977
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
978
AvahiSServiceBrowser *sb = NULL;
979
int error;
980
int ret;
981
intmax_t tmpmax;
982
char *tmp;
983
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
const char *seckey = PATHDIR "/" SECKEY;
995
const char *pubkey = PATHDIR "/" PUBKEY;
996
997
bool gnutls_initialized = false;
998
bool gpgme_initialized = false;
999
float delay = 2.5f;
1000
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1003
1004
uid = getuid();
1005
gid = getgid();
1006
1007
/* Lower any group privileges we might have, just to be safe */
1008
errno = 0;
1009
ret = setgid(gid);
1010
if(ret == -1){
1011
perror("setgid");
1012
}
1013
1014
/* Lower user privileges (temporarily) */
1015
errno = 0;
1016
ret = seteuid(uid);
1017
if(ret == -1){
1018
perror("seteuid");
1019
}
1020
1021
if(quit_now){
1022
goto end;
1023
}
1024
1025
{
1026
struct argp_option options[] = {
1027
{ .name = "debug", .key = 128,
1028
.doc = "Debug mode", .group = 3 },
1029
{ .name = "connect", .key = 'c',
1030
.arg = "ADDRESS:PORT",
1031
.doc = "Connect directly to a specific Mandos server",
1032
.group = 1 },
1033
{ .name = "interface", .key = 'i',
1034
.arg = "NAME",
1035
.doc = "Network interface that will be used to search for"
1036
" Mandos servers",
1037
.group = 1 },
1038
{ .name = "seckey", .key = 's',
1039
.arg = "FILE",
1040
.doc = "OpenPGP secret key file base name",
1041
.group = 1 },
1042
{ .name = "pubkey", .key = 'p',
1043
.arg = "FILE",
1044
.doc = "OpenPGP public key file base name",
1045
.group = 2 },
1046
{ .name = "dh-bits", .key = 129,
1047
.arg = "BITS",
1048
.doc = "Bit length of the prime number used in the"
1049
" Diffie-Hellman key exchange",
1050
.group = 2 },
1051
{ .name = "priority", .key = 130,
1052
.arg = "STRING",
1053
.doc = "GnuTLS priority string for the TLS handshake",
1054
.group = 1 },
1055
{ .name = "delay", .key = 131,
1056
.arg = "SECONDS",
1057
.doc = "Maximum delay to wait for interface startup",
1058
.group = 2 },
1059
{ .name = NULL }
1060
};
1061
1062
error_t parse_opt(int key, char *arg,
1063
struct argp_state *state){
1064
switch(key){
1065
case 128: /* --debug */
1066
debug = true;
1067
break;
1068
case 'c': /* --connect */
1069
connect_to = arg;
1070
break;
1071
case 'i': /* --interface */
1072
interface = arg;
1073
break;
1074
case 's': /* --seckey */
1075
seckey = arg;
1076
break;
1077
case 'p': /* --pubkey */
1078
pubkey = arg;
1079
break;
1080
case 129: /* --dh-bits */
1081
errno = 0;
1082
tmpmax = strtoimax(arg, &tmp, 10);
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1087
}
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
break;
1090
case 130: /* --priority */
1091
mc.priority = arg;
1092
break;
1093
case 131: /* --delay */
1094
errno = 0;
1095
delay = strtof(arg, &tmp);
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
1104
break;
1105
default:
1106
return ARGP_ERR_UNKNOWN;
1107
}
1108
return 0;
1109
}
1110
1111
struct argp argp = { .options = options, .parser = parse_opt,
1112
.args_doc = "",
1113
.doc = "Mandos client -- Get and decrypt"
1114
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
}
1122
1123
if(not debug){
1124
avahi_set_log_function(empty_log);
1125
}
1126
1127
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1128
from the signal handler */
1129
/* Initialize the pseudo-RNG for Avahi */
1130
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1137
1138
sigemptyset(&sigterm_action.sa_mask);
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
1143
goto end;
1144
}
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
1149
goto end;
1150
}
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
/* Need to check if the handler is SIG_IGN before handling:
1158
| [[info:libc:Initial Signal Actions]] |
1159
| [[info:libc:Basic Signal Handling]] |
1160
*/
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
1165
}
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
}
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
1178
}
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
1184
goto end;
1185
}
1186
}
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
1191
}
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
995
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
1204
if(if_index == 0){
997
1205
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
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
1343
}
1344
1345
if(quit_now){
1346
goto end;
1347
}
1348
1349
ret = init_gnutls_global(pubkey, seckey);
1350
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
1353
goto end;
1354
} else {
1355
gnutls_initialized = true;
1356
}
1357
1358
if(quit_now){
1359
goto end;
1360
}
1361
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
1366
goto end;
1367
}
1368
1369
if(quit_now){
1370
goto end;
1371
}
1372
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
1376
goto end;
1377
} else {
1378
gpgme_initialized = true;
1379
}
1380
1381
if(quit_now){
1382
goto end;
1383
}
1384
1385
if(connect_to != NULL){
1386
/* Connect directly, do not use Zeroconf */
1387
/* (Mainly meant for debugging) */
1388
char *address = strrchr(connect_to, ':');
1389
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
1392
goto end;
1393
}
1394
1395
if(quit_now){
1396
goto end;
1397
}
1398
1399
uint16_t port;
1400
errno = 0;
1401
tmpmax = strtoimax(address+1, &tmp, 10);
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
1406
goto end;
1407
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1413
port = (uint16_t)tmpmax;
1414
*address = '\0';
1415
address = connect_to;
1416
/* Colon in address indicates IPv6 */
1417
int af;
1418
if(strchr(address, ':') != NULL){
1419
af = AF_INET6;
1420
} else {
1421
af = AF_INET;
1422
}
1423
1424
if(quit_now){
1425
goto end;
1426
}
1427
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
1432
exitcode = EXIT_SUCCESS;
1433
}
1434
goto end;
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1441
{
1442
AvahiServerConfig config;
1443
/* Do not publish any local Zeroconf records */
1444
avahi_server_config_init(&config);
1445
config.publish_hinfo = 0;
1446
config.publish_addresses = 0;
1447
config.publish_workstation = 0;
1448
config.publish_domain = 0;
1449
1450
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
1454
1455
/* Free the Avahi configuration data */
1456
avahi_server_config_free(&config);
1457
}
1458
1459
/* Check if creating the Avahi server object succeeded */
1460
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
1464
goto end;
1465
}
1466
1467
if(quit_now){
1468
goto end;
1469
}
1470
1471
/* Create the Avahi service browser */
1472
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
1475
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1486
/* Run the main loop */
1487
1488
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
1493
1092
1494
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;
1495
1496
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
1498
}
1499
1500
/* Cleanup things */
1501
if(sb != NULL)
1502
avahi_s_service_browser_free(sb);
1503
1504
if(mc.server != NULL)
1505
avahi_server_free(mc.server);
1506
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
1509
1510
if(gnutls_initialized){
1511
gnutls_certificate_free_credentials(mc.cred);
1512
gnutls_global_deinit();
1513
gnutls_dh_params_deinit(mc.dh_params);
1514
}
1515
1516
if(gpgme_initialized){
1517
gpgme_release(mc.ctx);
1518
}
1519
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
1593
}
1594
}
1595
1596
if(quit_now){
1597
sigemptyset(&old_sigterm_action.sa_mask);
1598
old_sigterm_action.sa_handler = SIG_DFL;
1599
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1600
&old_sigterm_action,
1601
NULL));
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
do {
1606
ret = raise(signal_received);
1607
} while(ret != 0 and errno == EINTR);
1608
if(ret != 0){
1609
perror("raise");
1610
abort();
1611
}
1612
TEMP_FAILURE_RETRY(pause());
1613
}
1614
1615
return exitcode;
1158
1616
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0