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- Committer: Teddy Hogeborn
- Date: 2009-11-03 00:12:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20091103001235-op9jfvtx6xvxch3h
* README (FAQ): Fix typo.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
- 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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(), nanosleep() */
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
77
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
78
91
79
92
/* Avahi */
80
93
/* All Avahi types, constants and functions
126
139
gpgme_ctx_t ctx;
127
140
} mandos_context;
128
141
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
129
150
/*
130
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
131
* "buffer_capacity" is how much is currently allocated,
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
132
153
* "buffer_length" is how much is already used.
133
154
*/
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t incbuffer(char **buffer, size_t buffer_length,
135
156
size_t buffer_capacity){
136
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
137
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
146
167
/*
147
168
* Initialize GPGME.
148
169
*/
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
170
static bool init_gpgme(const char *seckey,
150
171
const char *pubkey, const char *tempdir){
151
int ret;
152
172
gpgme_error_t rc;
153
173
gpgme_engine_info_t engine_info;
154
174
155
175
156
176
/*
157
* Helper function to insert pub and seckey to the enigne keyring.
177
* Helper function to insert pub and seckey to the engine keyring.
158
178
*/
159
179
bool import_key(const char *filename){
180
int ret;
160
181
int fd;
161
182
gpgme_data_t pgp_data;
162
183
173
194
return false;
174
195
}
175
196
176
rc = gpgme_op_import(mc->ctx, pgp_data);
197
rc = gpgme_op_import(mc.ctx, pgp_data);
177
198
if(rc != GPG_ERR_NO_ERROR){
178
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
200
gpgme_strsource(rc), gpgme_strerror(rc));
189
210
}
190
211
191
212
if(debug){
192
fprintf(stderr, "Initialize gpgme\n");
213
fprintf(stderr, "Initializing GPGME\n");
193
214
}
194
215
195
216
/* Init GPGME */
222
243
}
223
244
224
245
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
246
rc = gpgme_new(&(mc.ctx));
226
247
if(rc != GPG_ERR_NO_ERROR){
227
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
249
gpgme_strsource(rc), gpgme_strerror(rc));
233
254
return false;
234
255
}
235
256
236
return true;
257
return true;
237
258
}
238
259
239
260
/*
240
261
* Decrypt OpenPGP data.
241
262
* Returns -1 on error
242
263
*/
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
245
265
size_t crypto_size,
246
266
char **plaintext){
247
267
gpgme_data_t dh_crypto, dh_plain;
274
294
275
295
/* Decrypt data from the cryptotext data buffer to the plaintext
276
296
data buffer */
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
278
298
if(rc != GPG_ERR_NO_ERROR){
279
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
300
gpgme_strsource(rc), gpgme_strerror(rc));
281
301
plaintext_length = -1;
282
302
if(debug){
283
303
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
304
result = gpgme_op_decrypt_result(mc.ctx);
285
305
if(result == NULL){
286
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
307
} else {
294
314
}
295
315
gpgme_recipient_t recipient;
296
316
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
}
317
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
324
recipient = recipient->next;
307
325
}
308
326
}
309
327
}
323
341
324
342
*plaintext = NULL;
325
343
while(true){
326
plaintext_capacity = adjustbuffer(plaintext,
344
plaintext_capacity = incbuffer(plaintext,
327
345
(size_t)plaintext_length,
328
346
plaintext_capacity);
329
347
if(plaintext_capacity == 0){
330
perror("adjustbuffer");
348
perror("incbuffer");
331
349
plaintext_length = -1;
332
350
goto decrypt_end;
333
351
}
365
383
return plaintext_length;
366
384
}
367
385
368
static const char * safer_gnutls_strerror(int value) {
386
static const char * safer_gnutls_strerror(int value){
369
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
388
-Wunreachable-code */
371
389
if(ret == NULL)
379
397
fprintf(stderr, "GnuTLS: %s", string);
380
398
}
381
399
382
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
400
static int init_gnutls_global(const char *pubkeyfilename,
384
401
const char *seckeyfilename){
385
402
int ret;
386
403
389
406
}
390
407
391
408
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
409
if(ret != GNUTLS_E_SUCCESS){
393
410
fprintf(stderr, "GnuTLS global_init: %s\n",
394
411
safer_gnutls_strerror(ret));
395
412
return -1;
404
421
}
405
422
406
423
/* OpenPGP credentials */
407
gnutls_certificate_allocate_credentials(&mc->cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
408
425
if(ret != GNUTLS_E_SUCCESS){
409
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
410
* from
411
* -Wunreachable-code
412
*/
427
from
428
-Wunreachable-code
429
*/
413
430
safer_gnutls_strerror(ret));
414
431
gnutls_global_deinit();
415
432
return -1;
422
439
}
423
440
424
441
ret = gnutls_certificate_set_openpgp_key_file
425
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
426
443
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
444
if(ret != GNUTLS_E_SUCCESS){
428
445
fprintf(stderr,
429
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
451
}
435
452
436
453
/* GnuTLS server initialization */
437
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
439
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
457
" %s\n", safer_gnutls_strerror(ret));
441
458
goto globalfail;
442
459
}
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
445
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
463
safer_gnutls_strerror(ret));
447
464
goto globalfail;
448
465
}
449
466
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
451
468
452
469
return 0;
453
470
454
471
globalfail:
455
472
456
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
457
474
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_dh_params_deinit(mc.dh_params);
459
476
return -1;
460
477
}
461
478
462
static int init_gnutls_session(mandos_context *mc,
463
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
464
480
int ret;
465
481
/* GnuTLS session creation */
466
ret = gnutls_init(session, GNUTLS_SERVER);
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
467
488
if(ret != GNUTLS_E_SUCCESS){
468
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
490
safer_gnutls_strerror(ret));
471
492
472
493
{
473
494
const char *err;
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
if(ret != GNUTLS_E_SUCCESS){
476
503
fprintf(stderr, "Syntax error at: %s\n", err);
477
504
fprintf(stderr, "GnuTLS error: %s\n",
478
505
safer_gnutls_strerror(ret));
481
508
}
482
509
}
483
510
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
if(ret != GNUTLS_E_SUCCESS){
487
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
521
safer_gnutls_strerror(ret));
489
522
gnutls_deinit(*session);
491
524
}
492
525
493
526
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
496
528
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
498
530
499
531
return 0;
500
532
}
506
538
/* Called when a Mandos server is found */
507
539
static int start_mandos_communication(const char *ip, uint16_t port,
508
540
AvahiIfIndex if_index,
509
mandos_context *mc){
510
int ret, tcp_sd;
541
int af){
542
int ret, tcp_sd = -1;
511
543
ssize_t sret;
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
513
548
char *buffer = NULL;
514
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
515
550
size_t buffer_length = 0;
516
551
size_t buffer_capacity = 0;
517
ssize_t decrypted_buffer_size;
518
552
size_t written;
519
int retval = 0;
520
char interface[IF_NAMESIZE];
553
int retval = -1;
521
554
gnutls_session_t session;
522
523
ret = init_gnutls_session(mc, &session);
555
int pf; /* Protocol family */
556
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
564
switch(af){
565
case AF_INET6:
566
pf = PF_INET6;
567
break;
568
case AF_INET:
569
pf = PF_INET;
570
break;
571
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
574
return -1;
575
}
576
577
ret = init_gnutls_session(&session);
524
578
if(ret != 0){
525
579
return -1;
526
580
}
527
581
528
582
if(debug){
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
530
584
"\n", ip, port);
531
585
}
532
586
533
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(tcp_sd < 0) {
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
if(tcp_sd < 0){
589
int e = errno;
535
590
perror("socket");
536
return -1;
591
errno = e;
592
goto mandos_end;
537
593
}
538
594
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);
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
545
598
}
546
599
547
600
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);
601
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
604
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
607
}
552
608
if(ret < 0 ){
609
int e = errno;
553
610
perror("inet_pton");
554
return -1;
611
errno = e;
612
goto mandos_end;
555
613
}
556
614
if(ret == 0){
615
int e = errno;
557
616
fprintf(stderr, "Bad address: %s\n", ip);
558
return -1;
617
errno = e;
618
goto mandos_end;
559
619
}
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
620
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
628
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
631
errno = EINVAL;
632
goto mandos_end;
633
}
634
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
636
}
637
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
561
639
-Wconversion and
562
640
-Wunreachable-code */
641
}
563
642
564
to.in6.sin6_scope_id = (uint32_t)if_index;
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
565
647
566
648
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){
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
char interface[IF_NAMESIZE];
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
653
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
656
}
657
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
660
}
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
if(pcret == NULL){
572
672
perror("inet_ntop");
573
673
} else {
574
674
if(strcmp(addrstr, ip) != 0){
577
677
}
578
678
}
579
679
580
ret = connect(tcp_sd, &to.in, sizeof(to));
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
581
690
if(ret < 0){
691
int e = errno;
582
692
perror("connect");
583
return -1;
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
584
700
}
585
701
586
702
const char *out = mandos_protocol_version;
590
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
707
out_size - written));
592
708
if(ret == -1){
709
int e = errno;
593
710
perror("write");
594
retval = -1;
711
errno = e;
595
712
goto mandos_end;
596
713
}
597
714
written += (size_t)ret;
605
722
break;
606
723
}
607
724
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
608
730
}
609
731
610
732
if(debug){
611
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
612
734
}
613
735
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
614
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
742
616
do{
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
617
749
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
618
754
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
619
755
620
756
if(ret != GNUTLS_E_SUCCESS){
622
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
623
759
gnutls_perror(ret);
624
760
}
625
retval = -1;
761
errno = EPROTO;
626
762
goto mandos_end;
627
763
}
628
764
629
765
/* Read OpenPGP packet that contains the wanted password */
630
766
631
767
if(debug){
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
633
769
ip);
634
770
}
635
771
636
772
while(true){
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
buffer_capacity = incbuffer(&buffer, buffer_length,
638
780
buffer_capacity);
639
781
if(buffer_capacity == 0){
640
perror("adjustbuffer");
641
retval = -1;
782
int e = errno;
783
perror("incbuffer");
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
642
790
goto mandos_end;
643
791
}
644
792
653
801
case GNUTLS_E_AGAIN:
654
802
break;
655
803
case GNUTLS_E_REHANDSHAKE:
656
do{
804
do {
657
805
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
658
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
659
812
if(ret < 0){
660
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
661
814
gnutls_perror(ret);
662
retval = -1;
815
errno = EPROTO;
663
816
goto mandos_end;
664
817
}
665
818
break;
666
819
default:
667
820
fprintf(stderr, "Unknown error while reading data from"
668
821
" encrypted session with Mandos server\n");
669
retval = -1;
670
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
671
824
goto mandos_end;
672
825
}
673
826
} else {
679
832
fprintf(stderr, "Closing TLS session\n");
680
833
}
681
834
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
683
847
684
848
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
849
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
686
851
buffer_length,
687
852
&decrypted_buffer);
688
853
if(decrypted_buffer_size >= 0){
854
689
855
written = 0;
690
856
while(written < (size_t) decrypted_buffer_size){
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
691
862
ret = (int)fwrite(decrypted_buffer + written, 1,
692
863
(size_t)decrypted_buffer_size - written,
693
864
stdout);
694
865
if(ret == 0 and ferror(stdout)){
866
int e = errno;
695
867
if(debug){
696
868
fprintf(stderr, "Error writing encrypted data: %s\n",
697
869
strerror(errno));
698
870
}
699
retval = -1;
700
break;
871
errno = e;
872
goto mandos_end;
701
873
}
702
874
written += (size_t)ret;
703
875
}
704
free(decrypted_buffer);
705
} else {
706
retval = -1;
876
retval = 0;
707
877
}
708
} else {
709
retval = -1;
710
878
}
711
879
712
880
/* Shutdown procedure */
713
881
714
882
mandos_end:
715
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
719
902
}
720
gnutls_deinit(session);
721
903
return retval;
722
904
}
723
905
724
906
static void resolve_callback(AvahiSServiceResolver *r,
725
907
AvahiIfIndex interface,
726
AVAHI_GCC_UNUSED AvahiProtocol protocol,
908
AvahiProtocol proto,
727
909
AvahiResolverEvent event,
728
910
const char *name,
729
911
const char *type,
734
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
735
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
736
918
flags,
737
void* userdata) {
738
mandos_context *mc = userdata;
919
AVAHI_GCC_UNUSED void* userdata){
739
920
assert(r);
740
921
741
922
/* Called whenever a service has been resolved successfully or
742
923
timed out */
743
924
744
switch(event) {
925
if(quit_now){
926
return;
927
}
928
929
switch(event){
745
930
default:
746
931
case AVAHI_RESOLVER_FAILURE:
747
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
748
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
749
avahi_strerror(avahi_server_errno(mc->server)));
934
avahi_strerror(avahi_server_errno(mc.server)));
750
935
break;
751
936
752
937
case AVAHI_RESOLVER_FOUND:
758
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
944
ip, (intmax_t)interface, port);
760
945
}
761
int ret = start_mandos_communication(ip, port, interface, mc);
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
762
948
if(ret == 0){
763
avahi_simple_poll_quit(mc->simple_poll);
949
avahi_simple_poll_quit(mc.simple_poll);
764
950
}
765
951
}
766
952
}
767
953
avahi_s_service_resolver_free(r);
768
954
}
769
955
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;
956
static void browse_callback(AvahiSServiceBrowser *b,
957
AvahiIfIndex interface,
958
AvahiProtocol protocol,
959
AvahiBrowserEvent event,
960
const char *name,
961
const char *type,
962
const char *domain,
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
flags,
965
AVAHI_GCC_UNUSED void* userdata){
781
966
assert(b);
782
967
783
968
/* Called whenever a new services becomes available on the LAN or
784
969
is removed from the LAN */
785
970
786
switch(event) {
971
if(quit_now){
972
return;
973
}
974
975
switch(event){
787
976
default:
788
977
case AVAHI_BROWSER_FAILURE:
789
978
790
979
fprintf(stderr, "(Avahi browser) %s\n",
791
avahi_strerror(avahi_server_errno(mc->server)));
792
avahi_simple_poll_quit(mc->simple_poll);
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
793
982
return;
794
983
795
984
case AVAHI_BROWSER_NEW:
798
987
the callback function is called the Avahi server will free the
799
988
resolver for us. */
800
989
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
802
protocol, name, type, domain,
803
AVAHI_PROTO_INET6, 0,
804
resolve_callback, mc)))
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
805
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
806
name, avahi_strerror(avahi_server_errno(mc->server)));
994
name, avahi_strerror(avahi_server_errno(mc.server)));
807
995
break;
808
996
809
997
case AVAHI_BROWSER_REMOVE:
818
1006
}
819
1007
}
820
1008
1009
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1011
if(quit_now){
1012
return;
1013
}
1014
quit_now = 1;
1015
signal_received = sig;
1016
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1021
}
1022
821
1023
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_initalized = false;
843
bool gpgme_initalized = false;
844
double delay = 2.5;
845
846
{
847
struct argp_option options[] = {
848
{ .name = "debug", .key = 128,
849
.doc = "Debug mode", .group = 3 },
850
{ .name = "connect", .key = 'c',
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
853
.group = 1 },
854
{ .name = "interface", .key = 'i',
855
.arg = "NAME",
856
.doc = "Interface that will be used to search for Mandos"
857
" servers",
858
.group = 1 },
859
{ .name = "seckey", .key = 's',
860
.arg = "FILE",
861
.doc = "OpenPGP secret key file base name",
862
.group = 1 },
863
{ .name = "pubkey", .key = 'p',
864
.arg = "FILE",
865
.doc = "OpenPGP public key file base name",
866
.group = 2 },
867
{ .name = "dh-bits", .key = 129,
868
.arg = "BITS",
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
871
.group = 2 },
872
{ .name = "priority", .key = 130,
873
.arg = "STRING",
874
.doc = "GnuTLS priority string for the TLS handshake",
875
.group = 1 },
876
{ .name = "delay", .key = 131,
877
.arg = "SECONDS",
878
.doc = "Maximum delay to wait for interface startup",
879
.group = 2 },
880
{ .name = NULL }
881
};
882
883
error_t parse_opt(int key, char *arg,
884
struct argp_state *state) {
885
switch(key) {
886
case 128: /* --debug */
887
debug = true;
888
break;
889
case 'c': /* --connect */
890
connect_to = arg;
891
break;
892
case 'i': /* --interface */
893
interface = arg;
894
break;
895
case 's': /* --seckey */
896
seckey = arg;
897
break;
898
case 'p': /* --pubkey */
899
pubkey = arg;
900
break;
901
case 129: /* --dh-bits */
902
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
903
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
904
or arg[numchars] != '\0'){
905
fprintf(stderr, "Bad number of DH bits\n");
906
exit(EXIT_FAILURE);
907
}
908
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
909
break;
910
case 130: /* --priority */
911
mc.priority = arg;
912
break;
913
case 131: /* --delay */
914
ret = sscanf(arg, "%lf%n", &delay, &numchars);
915
if(ret < 1 or arg[numchars] != '\0'){
916
fprintf(stderr, "Bad delay\n");
917
exit(EXIT_FAILURE);
918
}
919
break;
920
case ARGP_KEY_ARG:
921
argp_usage(state);
922
case ARGP_KEY_END:
923
break;
924
default:
925
return ARGP_ERR_UNKNOWN;
926
}
927
return 0;
928
}
929
930
struct argp argp = { .options = options, .parser = parse_opt,
931
.args_doc = "",
932
.doc = "Mandos client -- Get and decrypt"
933
" passwords from a Mandos server" };
934
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
935
if(ret == ARGP_ERR_UNKNOWN){
936
fprintf(stderr, "Unknown error while parsing arguments\n");
937
exitcode = EXIT_FAILURE;
938
goto end;
939
}
940
}
941
942
/* If the interface is down, bring it up */
943
{
944
// Lower kernel loglevel to KERN_NOTICE to avoid
945
// KERN_INFO messages to mess up the prompt
946
ret = klogctl(8, NULL, 5);
947
if(ret == -1){
948
perror("klogctl");
949
}
950
951
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
952
if(sd < 0) {
953
perror("socket");
954
exitcode = EXIT_FAILURE;
955
ret = klogctl(7, NULL, 0);
956
if(ret == -1){
957
perror("klogctl");
958
}
959
goto end;
960
}
961
strcpy(network.ifr_name, interface);
962
ret = ioctl(sd, SIOCGIFFLAGS, &network);
963
if(ret == -1){
964
perror("ioctl SIOCGIFFLAGS");
965
ret = klogctl(7, NULL, 0);
966
if(ret == -1){
967
perror("klogctl");
968
}
969
exitcode = EXIT_FAILURE;
970
goto end;
971
}
972
if((network.ifr_flags & IFF_UP) == 0){
973
network.ifr_flags |= IFF_UP;
974
ret = ioctl(sd, SIOCSIFFLAGS, &network);
975
if(ret == -1){
976
perror("ioctl SIOCSIFFLAGS");
977
exitcode = EXIT_FAILURE;
1024
AvahiSServiceBrowser *sb = NULL;
1025
int error;
1026
int ret;
1027
intmax_t tmpmax;
1028
char *tmp;
1029
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
bool tempdir_created = false;
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
const char *seckey = PATHDIR "/" SECKEY;
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1042
1043
bool gnutls_initialized = false;
1044
bool gpgme_initialized = false;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
1070
1071
{
1072
struct argp_option options[] = {
1073
{ .name = "debug", .key = 128,
1074
.doc = "Debug mode", .group = 3 },
1075
{ .name = "connect", .key = 'c',
1076
.arg = "ADDRESS:PORT",
1077
.doc = "Connect directly to a specific Mandos server",
1078
.group = 1 },
1079
{ .name = "interface", .key = 'i',
1080
.arg = "NAME",
1081
.doc = "Network interface that will be used to search for"
1082
" Mandos servers",
1083
.group = 1 },
1084
{ .name = "seckey", .key = 's',
1085
.arg = "FILE",
1086
.doc = "OpenPGP secret key file base name",
1087
.group = 1 },
1088
{ .name = "pubkey", .key = 'p',
1089
.arg = "FILE",
1090
.doc = "OpenPGP public key file base name",
1091
.group = 2 },
1092
{ .name = "dh-bits", .key = 129,
1093
.arg = "BITS",
1094
.doc = "Bit length of the prime number used in the"
1095
" Diffie-Hellman key exchange",
1096
.group = 2 },
1097
{ .name = "priority", .key = 130,
1098
.arg = "STRING",
1099
.doc = "GnuTLS priority string for the TLS handshake",
1100
.group = 1 },
1101
{ .name = "delay", .key = 131,
1102
.arg = "SECONDS",
1103
.doc = "Maximum delay to wait for interface startup",
1104
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
1114
{ .name = NULL }
1115
};
1116
1117
error_t parse_opt(int key, char *arg,
1118
struct argp_state *state){
1119
errno = 0;
1120
switch(key){
1121
case 128: /* --debug */
1122
debug = true;
1123
break;
1124
case 'c': /* --connect */
1125
connect_to = arg;
1126
break;
1127
case 'i': /* --interface */
1128
interface = arg;
1129
break;
1130
case 's': /* --seckey */
1131
seckey = arg;
1132
break;
1133
case 'p': /* --pubkey */
1134
pubkey = arg;
1135
break;
1136
case 129: /* --dh-bits */
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
1142
}
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
break;
1145
case 130: /* --priority */
1146
mc.priority = arg;
1147
break;
1148
case 131: /* --delay */
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
1153
}
1154
break;
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
1168
break;
1169
default:
1170
return ARGP_ERR_UNKNOWN;
1171
}
1172
return errno;
1173
}
1174
1175
struct argp argp = { .options = options, .parser = parse_opt,
1176
.args_doc = "",
1177
.doc = "Mandos client -- Get and decrypt"
1178
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
exitcode = EX_USAGE;
1192
goto end;
1193
}
1194
}
1195
1196
if(not debug){
1197
avahi_set_log_function(empty_log);
1198
}
1199
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
from the signal handler */
1202
/* Initialize the pseudo-RNG for Avahi */
1203
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1208
goto end;
1209
}
1210
1211
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
if(ret == -1){
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1216
goto end;
1217
}
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
if(ret == -1){
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1222
goto end;
1223
}
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
if(ret == -1){
1226
perror("sigaddset");
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
978
1356
ret = klogctl(7, NULL, 0);
979
1357
if(ret == -1){
980
1358
perror("klogctl");
981
1359
}
982
goto end;
983
1360
}
984
}
985
// sleep checking until interface is running
986
for(int i=0; i < delay * 4; i++){
987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
988
1365
if(ret == -1){
989
perror("ioctl SIOCGIFFLAGS");
990
} else if(network.ifr_flags & IFF_RUNNING){
991
break;
1366
perror("seteuid");
992
1367
}
993
struct timespec sleeptime = { .tv_nsec = 250000000 };
994
nanosleep(&sleeptime, NULL);
995
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
996
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
997
1388
if(ret == -1){
998
1389
perror("close");
999
1390
}
1000
// Restores kernel loglevel to default
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1001
1395
ret = klogctl(7, NULL, 0);
1002
1396
if(ret == -1){
1003
1397
perror("klogctl");
1004
1398
}
1005
1399
}
1006
1007
uid = getuid();
1008
gid = getgid();
1009
1010
ret = setuid(uid);
1011
if(ret == -1){
1012
perror("setuid");
1013
}
1014
1015
setgid(gid);
1016
if(ret == -1){
1017
perror("setgid");
1018
}
1019
1020
ret = init_gnutls_global(&mc, pubkey, seckey);
1021
if(ret == -1){
1022
fprintf(stderr, "init_gnutls_global failed\n");
1023
exitcode = EXIT_FAILURE;
1024
goto end;
1025
} else {
1026
gnutls_initalized = true;
1027
}
1028
1029
if(mkdtemp(tempdir) == NULL){
1030
perror("mkdtemp");
1031
tempdir[0] = '\0';
1032
goto end;
1033
}
1034
1035
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1036
fprintf(stderr, "gpgme_initalized failed\n");
1037
exitcode = EXIT_FAILURE;
1038
goto end;
1039
} else {
1040
gpgme_initalized = true;
1041
}
1042
1043
if_index = (AvahiIfIndex) if_nametoindex(interface);
1044
if(if_index == 0){
1045
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1046
exit(EXIT_FAILURE);
1047
}
1048
1049
if(connect_to != NULL){
1050
/* Connect directly, do not use Zeroconf */
1051
/* (Mainly meant for debugging) */
1052
char *address = strrchr(connect_to, ':');
1053
if(address == NULL){
1054
fprintf(stderr, "No colon in address\n");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
uint16_t port;
1059
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1060
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1061
or address[numchars+1] != '\0'){
1062
fprintf(stderr, "Bad port number\n");
1063
exitcode = EXIT_FAILURE;
1064
goto end;
1065
}
1066
port = (uint16_t)tmpmax;
1067
*address = '\0';
1068
address = connect_to;
1069
ret = start_mandos_communication(address, port, if_index, &mc);
1070
if(ret < 0){
1071
exitcode = EXIT_FAILURE;
1072
} else {
1073
exitcode = EXIT_SUCCESS;
1074
}
1075
goto end;
1076
}
1077
1078
if(not debug){
1079
avahi_set_log_function(empty_log);
1080
}
1081
1082
/* Initialize the pseudo-RNG for Avahi */
1083
srand((unsigned int) time(NULL));
1084
1085
/* Allocate main Avahi loop object */
1086
mc.simple_poll = avahi_simple_poll_new();
1087
if(mc.simple_poll == NULL) {
1088
fprintf(stderr, "Avahi: Failed to create simple poll"
1089
" object.\n");
1090
exitcode = EXIT_FAILURE;
1091
goto end;
1092
}
1093
1094
{
1095
AvahiServerConfig config;
1096
/* Do not publish any local Zeroconf records */
1097
avahi_server_config_init(&config);
1098
config.publish_hinfo = 0;
1099
config.publish_addresses = 0;
1100
config.publish_workstation = 0;
1101
config.publish_domain = 0;
1102
1103
/* Allocate a new server */
1104
mc.server = avahi_server_new(avahi_simple_poll_get
1105
(mc.simple_poll), &config, NULL,
1106
NULL, &error);
1107
1108
/* Free the Avahi configuration data */
1109
avahi_server_config_free(&config);
1110
}
1111
1112
/* Check if creating the Avahi server object succeeded */
1113
if(mc.server == NULL) {
1114
fprintf(stderr, "Failed to create Avahi server: %s\n",
1115
avahi_strerror(error));
1116
exitcode = EXIT_FAILURE;
1117
goto end;
1118
}
1119
1120
/* Create the Avahi service browser */
1121
sb = avahi_s_service_browser_new(mc.server, if_index,
1122
AVAHI_PROTO_INET6,
1123
"_mandos._tcp", NULL, 0,
1124
browse_callback, &mc);
1125
if(sb == NULL) {
1126
fprintf(stderr, "Failed to create service browser: %s\n",
1127
avahi_strerror(avahi_server_errno(mc.server)));
1128
exitcode = EXIT_FAILURE;
1129
goto end;
1130
}
1131
1132
/* Run the main loop */
1133
1134
if(debug){
1135
fprintf(stderr, "Starting Avahi loop search\n");
1136
}
1137
1138
avahi_simple_poll_loop(mc.simple_poll);
1139
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
goto end;
1420
}
1421
1422
ret = init_gnutls_global(pubkey, seckey);
1423
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1426
goto end;
1427
} else {
1428
gnutls_initialized = true;
1429
}
1430
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1449
goto end;
1450
} else {
1451
gpgme_initialized = true;
1452
}
1453
1454
if(quit_now){
1455
goto end;
1456
}
1457
1458
if(connect_to != NULL){
1459
/* Connect directly, do not use Zeroconf */
1460
/* (Mainly meant for debugging) */
1461
char *address = strrchr(connect_to, ':');
1462
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1472
uint16_t port;
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1486
port = (uint16_t)tmpmax;
1487
*address = '\0';
1488
address = connect_to;
1489
/* Colon in address indicates IPv6 */
1490
int af;
1491
if(strchr(address, ':') != NULL){
1492
af = AF_INET6;
1493
} else {
1494
af = AF_INET;
1495
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
1523
exitcode = EXIT_SUCCESS;
1524
}
1525
goto end;
1526
}
1527
1528
if(quit_now){
1529
goto end;
1530
}
1531
1532
{
1533
AvahiServerConfig config;
1534
/* Do not publish any local Zeroconf records */
1535
avahi_server_config_init(&config);
1536
config.publish_hinfo = 0;
1537
config.publish_addresses = 0;
1538
config.publish_workstation = 0;
1539
config.publish_domain = 0;
1540
1541
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
1545
1546
/* Free the Avahi configuration data */
1547
avahi_server_config_free(&config);
1548
}
1549
1550
/* Check if creating the Avahi server object succeeded */
1551
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
/* Create the Avahi service browser */
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1566
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1574
goto end;
1575
}
1576
1577
/* Run the main loop */
1578
1579
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
1584
1140
1585
end:
1141
1142
if(debug){
1143
fprintf(stderr, "%s exiting\n", argv[0]);
1144
}
1145
1146
/* Cleanup things */
1147
if(sb != NULL)
1148
avahi_s_service_browser_free(sb);
1149
1150
if(mc.server != NULL)
1151
avahi_server_free(mc.server);
1152
1153
if(mc.simple_poll != NULL)
1154
avahi_simple_poll_free(mc.simple_poll);
1155
1156
if(gnutls_initalized){
1157
gnutls_certificate_free_credentials(mc.cred);
1158
gnutls_global_deinit();
1159
gnutls_dh_params_deinit(mc.dh_params);
1160
}
1161
1162
if(gpgme_initalized){
1163
gpgme_release(mc.ctx);
1164
}
1165
1166
/* Removes the temp directory used by GPGME */
1167
if(tempdir[0] != '\0'){
1168
DIR *d;
1169
struct dirent *direntry;
1170
d = opendir(tempdir);
1171
if(d == NULL){
1172
if(errno != ENOENT){
1173
perror("opendir");
1174
}
1175
} else {
1176
while(true){
1177
direntry = readdir(d);
1178
if(direntry == NULL){
1179
break;
1180
}
1181
if(direntry->d_type == DT_REG){
1182
char *fullname = NULL;
1183
ret = asprintf(&fullname, "%s/%s", tempdir,
1184
direntry->d_name);
1185
if(ret < 0){
1186
perror("asprintf");
1187
continue;
1188
}
1189
ret = unlink(fullname);
1190
if(ret == -1){
1191
fprintf(stderr, "unlink(\"%s\"): %s",
1192
fullname, strerror(errno));
1193
}
1194
free(fullname);
1195
}
1196
}
1197
closedir(d);
1198
}
1199
ret = rmdir(tempdir);
1200
if(ret == -1 and errno != ENOENT){
1201
perror("rmdir");
1202
}
1203
}
1204
1205
return exitcode;
1586
1587
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
1589
}
1590
1591
/* Cleanup things */
1592
if(sb != NULL)
1593
avahi_s_service_browser_free(sb);
1594
1595
if(mc.server != NULL)
1596
avahi_server_free(mc.server);
1597
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
1600
1601
if(gnutls_initialized){
1602
gnutls_certificate_free_credentials(mc.cred);
1603
gnutls_global_deinit();
1604
gnutls_dh_params_deinit(mc.dh_params);
1605
}
1606
1607
if(gpgme_initialized){
1608
gpgme_release(mc.ctx);
1609
}
1610
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
1684
}
1685
}
1686
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1706
return exitcode;
1206
1707
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0