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- Committer: Teddy Hogeborn
- Date: 2009-02-07 05:05:03 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207050503-wi4qno0t5ua46vvx
* initramfs-tools-hook: Add extra newline to plugin-runner.conf to
guard against a possible comment character
without a newline.
guard against a possible comment character
without a newline.
- 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
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
56
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
63
#include <errno.h> /* perror(), errno */
66
64
#include <time.h> /* nanosleep(), time() */
67
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
66
SIOCSIFFLAGS, if_indextoname(),
69
67
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
68
#include <netinet/in.h>
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
70
getuid(), getgid(), setuid(),
75
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
73
#include <iso646.h> /* not, and, or */
78
74
#include <argp.h> /* struct argp_option, error_t, struct
79
75
argp_state, struct argp,
80
76
argp_parse(), ARGP_KEY_ARG,
81
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
78
#ifdef __linux__
87
79
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
80
#endif
89
81
90
82
/* Avahi */
91
83
/* All Avahi types, constants and functions
137
129
gpgme_ctx_t ctx;
138
130
} mandos_context;
139
131
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
132
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
148
135
* "buffer_length" is how much is already used.
149
136
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
138
size_t buffer_capacity){
152
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
162
149
/*
163
150
* Initialize GPGME.
164
151
*/
165
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
153
const char *pubkey, const char *tempdir){
154
int ret;
167
155
gpgme_error_t rc;
168
156
gpgme_engine_info_t engine_info;
169
157
172
160
* Helper function to insert pub and seckey to the engine keyring.
173
161
*/
174
162
bool import_key(const char *filename){
175
int ret;
176
163
int fd;
177
164
gpgme_data_t pgp_data;
178
165
189
176
return false;
190
177
}
191
178
192
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
193
180
if(rc != GPG_ERR_NO_ERROR){
194
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
182
gpgme_strsource(rc), gpgme_strerror(rc));
205
192
}
206
193
207
194
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
209
196
}
210
197
211
198
/* Init GPGME */
238
225
}
239
226
240
227
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
242
229
if(rc != GPG_ERR_NO_ERROR){
243
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
231
gpgme_strsource(rc), gpgme_strerror(rc));
249
236
return false;
250
237
}
251
238
252
return true;
239
return true;
253
240
}
254
241
255
242
/*
256
243
* Decrypt OpenPGP data.
257
244
* Returns -1 on error
258
245
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
260
248
size_t crypto_size,
261
249
char **plaintext){
262
250
gpgme_data_t dh_crypto, dh_plain;
289
277
290
278
/* Decrypt data from the cryptotext data buffer to the plaintext
291
279
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
281
if(rc != GPG_ERR_NO_ERROR){
294
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
283
gpgme_strsource(rc), gpgme_strerror(rc));
296
284
plaintext_length = -1;
297
285
if(debug){
298
286
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
300
288
if(result == NULL){
301
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
290
} else {
309
297
}
310
298
gpgme_recipient_t recipient;
311
299
recipient = result->recipients;
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;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
320
310
}
321
311
}
322
312
}
336
326
337
327
*plaintext = NULL;
338
328
while(true){
339
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
340
330
(size_t)plaintext_length,
341
331
plaintext_capacity);
342
332
if(plaintext_capacity == 0){
343
perror("incbuffer");
333
perror("adjustbuffer");
344
334
plaintext_length = -1;
345
335
goto decrypt_end;
346
336
}
392
382
fprintf(stderr, "GnuTLS: %s", string);
393
383
}
394
384
395
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
396
387
const char *seckeyfilename){
397
388
int ret;
398
389
416
407
}
417
408
418
409
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
420
411
if(ret != GNUTLS_E_SUCCESS){
421
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
413
* from
414
* -Wunreachable-code
415
*/
425
416
safer_gnutls_strerror(ret));
426
417
gnutls_global_deinit();
427
418
return -1;
434
425
}
435
426
436
427
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
438
429
GNUTLS_OPENPGP_FMT_BASE64);
439
430
if(ret != GNUTLS_E_SUCCESS){
440
431
fprintf(stderr,
446
437
}
447
438
448
439
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
450
441
if(ret != GNUTLS_E_SUCCESS){
451
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
443
" %s\n", safer_gnutls_strerror(ret));
453
444
goto globalfail;
454
445
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
447
if(ret != GNUTLS_E_SUCCESS){
457
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
449
safer_gnutls_strerror(ret));
459
450
goto globalfail;
460
451
}
461
452
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
454
464
455
return 0;
465
456
466
457
globalfail:
467
458
468
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
469
460
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
471
462
return -1;
472
463
}
473
464
474
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
475
467
int ret;
476
468
/* GnuTLS session creation */
477
do {
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
480
470
if(ret != GNUTLS_E_SUCCESS){
481
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
472
safer_gnutls_strerror(ret));
484
474
485
475
{
486
476
const char *err;
487
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
490
478
if(ret != GNUTLS_E_SUCCESS){
491
479
fprintf(stderr, "Syntax error at: %s\n", err);
492
480
fprintf(stderr, "GnuTLS error: %s\n",
496
484
}
497
485
}
498
486
499
do {
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
503
489
if(ret != GNUTLS_E_SUCCESS){
504
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
491
safer_gnutls_strerror(ret));
508
494
}
509
495
510
496
/* ignore client certificate if any. */
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
512
499
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
514
501
515
502
return 0;
516
503
}
519
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
507
__attribute__((unused)) const char *txt){}
521
508
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
509
/* Called when a Mandos server is found */
526
510
static int start_mandos_communication(const char *ip, uint16_t port,
527
511
AvahiIfIndex if_index,
528
int af){
529
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
530
514
ssize_t sret;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
535
516
char *buffer = NULL;
536
517
char *decrypted_buffer;
537
518
size_t buffer_length = 0;
538
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
539
521
size_t written;
540
522
int retval = 0;
523
char interface[IF_NAMESIZE];
541
524
gnutls_session_t session;
542
int pf; /* Protocol family */
543
544
if(quit_now){
545
return -1;
546
}
547
548
switch(af){
549
case AF_INET6:
550
pf = PF_INET6;
551
break;
552
case AF_INET:
553
pf = PF_INET;
554
break;
555
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
557
return -1;
558
}
559
560
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
561
527
if(ret != 0){
562
528
return -1;
563
529
}
564
530
565
531
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
567
533
"\n", ip, port);
568
534
}
569
535
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
571
537
if(tcp_sd < 0){
572
538
perror("socket");
573
retval = -1;
574
goto mandos_end;
539
return -1;
575
540
}
576
541
577
if(quit_now){
578
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
579
548
}
580
549
581
550
memset(&to, 0, sizeof(to));
582
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
585
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
588
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
589
555
if(ret < 0 ){
590
556
perror("inet_pton");
591
retval = -1;
592
goto mandos_end;
557
return -1;
593
558
}
594
559
if(ret == 0){
595
560
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
597
goto mandos_end;
561
return -1;
598
562
}
599
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
611
goto mandos_end;
612
}
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
615
}
616
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
618
564
-Wconversion and
619
565
-Wunreachable-code */
620
}
621
566
622
if(quit_now){
623
goto mandos_end;
624
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
625
568
626
569
if(debug){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
631
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
634
}
635
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
638
}
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
650
575
perror("inet_ntop");
651
576
} else {
652
577
if(strcmp(addrstr, ip) != 0){
655
580
}
656
581
}
657
582
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
667
584
if(ret < 0){
668
585
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
586
return -1;
675
587
}
676
588
677
589
const char *out = mandos_protocol_version;
696
608
break;
697
609
}
698
610
}
699
700
if(quit_now){
701
goto mandos_end;
702
}
703
611
}
704
612
705
613
if(debug){
706
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
707
615
}
708
616
709
if(quit_now){
710
goto mandos_end;
711
}
712
713
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
714
618
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
do {
619
do{
720
620
ret = gnutls_handshake(session);
721
if(quit_now){
722
goto mandos_end;
723
}
724
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
622
726
623
if(ret != GNUTLS_E_SUCCESS){
735
632
/* Read OpenPGP packet that contains the wanted password */
736
633
737
634
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
739
636
ip);
740
637
}
741
638
742
639
while(true){
743
744
if(quit_now){
745
goto mandos_end;
746
}
747
748
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
641
buffer_capacity);
750
642
if(buffer_capacity == 0){
751
perror("incbuffer");
643
perror("adjustbuffer");
752
644
retval = -1;
753
645
goto mandos_end;
754
646
}
755
647
756
if(quit_now){
757
goto mandos_end;
758
}
759
760
648
sret = gnutls_record_recv(session, buffer+buffer_length,
761
649
BUFFER_SIZE);
762
650
if(sret == 0){
768
656
case GNUTLS_E_AGAIN:
769
657
break;
770
658
case GNUTLS_E_REHANDSHAKE:
771
do {
659
do{
772
660
ret = gnutls_handshake(session);
773
774
if(quit_now){
775
goto mandos_end;
776
}
777
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
662
if(ret < 0){
779
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
798
682
fprintf(stderr, "Closing TLS session\n");
799
683
}
800
684
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
686
807
if(quit_now){
808
goto mandos_end;
809
}
810
811
687
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
814
689
buffer_length,
815
690
&decrypted_buffer);
816
691
if(decrypted_buffer_size >= 0){
817
818
692
written = 0;
819
693
while(written < (size_t) decrypted_buffer_size){
820
if(quit_now){
821
goto mandos_end;
822
}
823
824
694
ret = (int)fwrite(decrypted_buffer + written, 1,
825
695
(size_t)decrypted_buffer_size - written,
826
696
stdout);
846
716
847
717
mandos_end:
848
718
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
852
720
if(ret == -1){
853
721
perror("close");
854
722
}
855
723
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
859
724
return retval;
860
725
}
861
726
862
727
static void resolve_callback(AvahiSServiceResolver *r,
863
728
AvahiIfIndex interface,
864
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
865
730
AvahiResolverEvent event,
866
731
const char *name,
867
732
const char *type,
872
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
739
flags,
875
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
876
742
assert(r);
877
743
878
744
/* Called whenever a service has been resolved successfully or
879
745
timed out */
880
746
881
if(quit_now){
882
return;
883
}
884
885
747
switch(event){
886
748
default:
887
749
case AVAHI_RESOLVER_FAILURE:
888
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
891
753
break;
892
754
893
755
case AVAHI_RESOLVER_FOUND:
899
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
762
ip, (intmax_t)interface, port);
901
763
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
904
765
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
766
avahi_simple_poll_quit(mc->simple_poll);
906
767
}
907
768
}
908
769
}
918
779
const char *domain,
919
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
781
flags,
921
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
922
784
assert(b);
923
785
924
786
/* Called whenever a new services becomes available on the LAN or
925
787
is removed from the LAN */
926
788
927
if(quit_now){
928
return;
929
}
930
931
789
switch(event){
932
790
default:
933
791
case AVAHI_BROWSER_FAILURE:
934
792
935
793
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
938
796
return;
939
797
940
798
case AVAHI_BROWSER_NEW:
943
801
the callback function is called the Avahi server will free the
944
802
resolver for us. */
945
803
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
949
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
951
810
break;
952
811
953
812
case AVAHI_BROWSER_REMOVE:
962
821
}
963
822
}
964
823
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
977
}
978
979
824
int main(int argc, char *argv[]){
980
825
AvahiSServiceBrowser *sb = NULL;
981
826
int error;
982
827
int ret;
983
828
intmax_t tmpmax;
984
char *tmp;
829
int numchars;
985
830
int exitcode = EXIT_SUCCESS;
986
831
const char *interface = "eth0";
987
832
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
833
int sd;
990
834
uid_t uid;
991
835
gid_t gid;
992
836
char *connect_to = NULL;
996
840
const char *seckey = PATHDIR "/" SECKEY;
997
841
const char *pubkey = PATHDIR "/" PUBKEY;
998
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
999
846
bool gnutls_initialized = false;
1000
847
bool gpgme_initialized = false;
1001
float delay = 2.5f;
1002
1003
struct sigaction old_sigterm_action;
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1006
uid = getuid();
1007
gid = getgid();
1008
1009
/* Lower any group privileges we might have, just to be safe */
1010
errno = 0;
1011
ret = setgid(gid);
1012
if(ret == -1){
1013
perror("setgid");
1014
}
1015
1016
/* Lower user privileges (temporarily) */
1017
errno = 0;
1018
ret = seteuid(uid);
1019
if(ret == -1){
1020
perror("seteuid");
1021
}
1022
1023
if(quit_now){
1024
goto end;
1025
}
848
double delay = 2.5;
1026
849
1027
850
{
1028
851
struct argp_option options[] = {
1034
857
.group = 1 },
1035
858
{ .name = "interface", .key = 'i',
1036
859
.arg = "NAME",
1037
.doc = "Network interface that will be used to search for"
1038
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1039
862
.group = 1 },
1040
863
{ .name = "seckey", .key = 's',
1041
864
.arg = "FILE",
1080
903
pubkey = arg;
1081
904
break;
1082
905
case 129: /* --dh-bits */
1083
errno = 0;
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
1087
909
fprintf(stderr, "Bad number of DH bits\n");
1088
910
exit(EXIT_FAILURE);
1089
911
}
1093
915
mc.priority = arg;
1094
916
break;
1095
917
case 131: /* --delay */
1096
errno = 0;
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
1099
920
fprintf(stderr, "Bad delay\n");
1100
921
exit(EXIT_FAILURE);
1101
922
}
1122
943
}
1123
944
}
1124
945
1125
if(not debug){
1126
avahi_set_log_function(empty_log);
1127
}
1128
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1137
goto end;
1138
}
1139
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1151
goto end;
1152
}
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1157
goto end;
1158
}
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1162
*/
1163
ret = sigaction(SIGINT, 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(SIGINT, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1180
}
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
946
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
if(if_index == 0){
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
947
{
1223
948
#ifdef __linux__
1224
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
950
messages to mess up the prompt */
1226
951
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
952
if(ret == -1){
1229
restore_loglevel = false;
1230
953
perror("klogctl");
1231
954
}
1232
#endif /* __linux__ */
955
#endif
1233
956
1234
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
958
if(sd < 0){
1236
959
perror("socket");
1237
960
exitcode = EXIT_FAILURE;
1238
961
#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
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1249
963
if(ret == -1){
1250
perror("seteuid");
964
perror("klogctl");
1251
965
}
966
#endif
1252
967
goto end;
1253
968
}
1254
969
strcpy(network.ifr_name, interface);
1256
971
if(ret == -1){
1257
972
perror("ioctl SIOCGIFFLAGS");
1258
973
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
974
ret = klogctl(7, NULL, 0);
975
if(ret == -1){
976
perror("klogctl");
1264
977
}
1265
#endif /* __linux__ */
978
#endif
1266
979
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
980
goto end;
1274
981
}
1275
982
if((network.ifr_flags & IFF_UP) == 0){
1276
983
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
985
if(ret == -1){
1280
take_down_interface = false;
1281
986
perror("ioctl SIOCSIFFLAGS");
1282
987
exitcode = EXIT_FAILURE;
1283
988
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1294
990
if(ret == -1){
1295
perror("seteuid");
991
perror("klogctl");
1296
992
}
993
#endif
1297
994
goto end;
1298
995
}
1299
996
}
1311
1008
perror("nanosleep");
1312
1009
}
1313
1010
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1320
1014
}
1321
1015
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
1345
}
1346
1347
if(quit_now){
1348
goto end;
1349
}
1350
1351
ret = init_gnutls_global(pubkey, seckey);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1352
1038
if(ret == -1){
1353
1039
fprintf(stderr, "init_gnutls_global failed\n");
1354
1040
exitcode = EXIT_FAILURE;
1357
1043
gnutls_initialized = true;
1358
1044
}
1359
1045
1360
if(quit_now){
1361
goto end;
1362
}
1363
1364
tempdir_created = true;
1365
1046
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
1047
perror("mkdtemp");
1368
1048
goto end;
1369
1049
}
1370
1371
if(quit_now){
1372
goto end;
1373
}
1374
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1050
tempdir_created = true;
1051
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1376
1053
fprintf(stderr, "init_gpgme failed\n");
1377
1054
exitcode = EXIT_FAILURE;
1378
1055
goto end;
1380
1057
gpgme_initialized = true;
1381
1058
}
1382
1059
1383
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1384
1064
goto end;
1385
1065
}
1386
1066
1393
1073
exitcode = EXIT_FAILURE;
1394
1074
goto end;
1395
1075
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
1076
uint16_t port;
1402
errno = 0;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1406
1080
fprintf(stderr, "Bad port number\n");
1407
1081
exitcode = EXIT_FAILURE;
1408
1082
goto end;
1409
1083
}
1410
1411
if(quit_now){
1412
goto end;
1413
}
1414
1415
1084
port = (uint16_t)tmpmax;
1416
1085
*address = '\0';
1417
1086
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1419
int af;
1420
if(strchr(address, ':') != NULL){
1421
af = AF_INET6;
1422
} else {
1423
af = AF_INET;
1424
}
1425
1426
if(quit_now){
1427
goto end;
1428
}
1429
1430
ret = start_mandos_communication(address, port, if_index, af);
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1431
1088
if(ret < 0){
1432
1089
exitcode = EXIT_FAILURE;
1433
1090
} else {
1436
1093
goto end;
1437
1094
}
1438
1095
1439
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
1440
1108
goto end;
1441
1109
}
1442
1110
1466
1134
goto end;
1467
1135
}
1468
1136
1469
if(quit_now){
1470
goto end;
1471
}
1472
1473
1137
/* Create the Avahi service browser */
1474
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1477
1141
if(sb == NULL){
1478
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1479
1143
avahi_strerror(avahi_server_errno(mc.server)));
1481
1145
goto end;
1482
1146
}
1483
1147
1484
if(quit_now){
1485
goto end;
1486
}
1487
1488
1148
/* Run the main loop */
1489
1149
1490
1150
if(debug){
1519
1179
gpgme_release(mc.ctx);
1520
1180
}
1521
1181
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
1182
/* Removes the temp directory used by GPGME */
1555
1183
if(tempdir_created){
1556
1184
DIR *d;
1595
1223
}
1596
1224
}
1597
1225
1598
if(quit_now){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
1606
}
1607
1608
1226
return exitcode;
1609
1227
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0