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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:01:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209020113-726hq380zvp8zt97
Four new interrelated features:
1. Support using a different network interface via both initramfs.conf
(the DEVICE setting) and the kernel command line (sixth field of
the "ip=" option as in Linux' Documentation/nfsroot.txt).
2. Support connecting to a specified Mandos server directly using a
kernel command line option ("mandos=connect:<ADDRESS>:<PORT>").
3. Support connecting directly to an IPv4 address (and port) using the
"--connect" option of mandos-client.
4. Support an empty string to the --interface option to mandos-client.
* Makefile (WARN): Increase strictness by changing to
"-Wstrict-aliasing=1".
* debian/mandos-client.README.Debian (Use the Correct Network
Interface): Changed to refer to initramfs.conf and nfsroot.txt.
(Test the Server): Improve wording.
(Non-local Connection): New section.
* initramfs-tools-script: Obey DEVICE environment variable and setting
from "/conf/initramfs.conf". Also let any
"ip=" kernel command line option override
it. Support new "mandos=connect" option.
Call "configure_networking" to set up IP
address on interface if necessary.
* plugin-runner.conf: Change example.
* plugins.d/mandos-client.c: Some whitespace and comment changes.
(start_mandos_communication): Take an additional argument for
address family, all callers changed.
Connect to an IPv4 address if address
family is AF_INET. Only set IPv6
scope_id for link-local addresses.
(main): Accept empty interface name; this will not bring up any
interface and leave the interface as unspecified. Also do
not restore kernel log level if lowering it failed.
* plugins.d/mandos-client.xml (OPTIONS): Document that the
"--interface" option accepts
an empty string.
(EXAMPLE): Change example IPv6 address to a link-local address.
1. Support using a different network interface via both initramfs.conf
(the DEVICE setting) and the kernel command line (sixth field of
the "ip=" option as in Linux' Documentation/nfsroot.txt).
2. Support connecting to a specified Mandos server directly using a
kernel command line option ("mandos=connect:<ADDRESS>:<PORT>").
3. Support connecting directly to an IPv4 address (and port) using the
"--connect" option of mandos-client.
4. Support an empty string to the --interface option to mandos-client.
* Makefile (WARN): Increase strictness by changing to
"-Wstrict-aliasing=1".
* debian/mandos-client.README.Debian (Use the Correct Network
Interface): Changed to refer to initramfs.conf and nfsroot.txt.
(Test the Server): Improve wording.
(Non-local Connection): New section.
* initramfs-tools-script: Obey DEVICE environment variable and setting
from "/conf/initramfs.conf". Also let any
"ip=" kernel command line option override
it. Support new "mandos=connect" option.
Call "configure_networking" to set up IP
address on interface if necessary.
* plugin-runner.conf: Change example.
* plugins.d/mandos-client.c: Some whitespace and comment changes.
(start_mandos_communication): Take an additional argument for
address family, all callers changed.
Connect to an IPv4 address if address
family is AF_INET. Only set IPv6
scope_id for link-local addresses.
(main): Accept empty interface name; this will not bring up any
interface and leave the interface as unspecified. Also do
not restore kernel log level if lowering it failed.
* plugins.d/mandos-client.xml (OPTIONS): Document that the
"--interface" option accepts
an empty string.
(EXAMPLE): Change example IPv6 address to a link-local address.
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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
61
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time(), sleep() */
62
#include <time.h> /* nanosleep(), time() */
67
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
64
SIOCSIFFLAGS, if_indextoname(),
69
65
if_nametoindex(), IF_NAMESIZE */
71
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
68
*/
73
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
70
getuid(), getgid(), setuid(),
71
setgid() */
76
72
#include <arpa/inet.h> /* inet_pton(), htons */
77
73
#include <iso646.h> /* not, or, and */
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
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
78
#ifdef __linux__
89
79
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
80
#endif
91
81
92
82
/* Avahi */
93
83
/* All Avahi types, constants and functions
127
117
static const char mandos_protocol_version[] = "1";
128
118
const char *argp_program_version = "mandos-client " VERSION;
129
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
120
133
121
/* Used for passing in values through the Avahi callback functions */
134
122
typedef struct {
141
129
gpgme_ctx_t ctx;
142
130
} mandos_context;
143
131
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
132
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* 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,
155
135
* "buffer_length" is how much is already used.
156
136
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
138
size_t buffer_capacity){
159
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
169
149
/*
170
150
* Initialize GPGME.
171
151
*/
172
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
173
153
const char *pubkey, const char *tempdir){
154
int ret;
174
155
gpgme_error_t rc;
175
156
gpgme_engine_info_t engine_info;
176
157
179
160
* Helper function to insert pub and seckey to the engine keyring.
180
161
*/
181
162
bool import_key(const char *filename){
182
int ret;
183
163
int fd;
184
164
gpgme_data_t pgp_data;
185
165
196
176
return false;
197
177
}
198
178
199
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
200
180
if(rc != GPG_ERR_NO_ERROR){
201
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
182
gpgme_strsource(rc), gpgme_strerror(rc));
212
192
}
213
193
214
194
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
216
196
}
217
197
218
198
/* Init GPGME */
245
225
}
246
226
247
227
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
249
229
if(rc != GPG_ERR_NO_ERROR){
250
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
231
gpgme_strsource(rc), gpgme_strerror(rc));
256
236
return false;
257
237
}
258
238
259
return true;
239
return true;
260
240
}
261
241
262
242
/*
263
243
* Decrypt OpenPGP data.
264
244
* Returns -1 on error
265
245
*/
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
267
248
size_t crypto_size,
268
249
char **plaintext){
269
250
gpgme_data_t dh_crypto, dh_plain;
296
277
297
278
/* Decrypt data from the cryptotext data buffer to the plaintext
298
279
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
281
if(rc != GPG_ERR_NO_ERROR){
301
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
283
gpgme_strsource(rc), gpgme_strerror(rc));
303
284
plaintext_length = -1;
304
285
if(debug){
305
286
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
307
288
if(result == NULL){
308
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
309
290
} else {
316
297
}
317
298
gpgme_recipient_t recipient;
318
299
recipient = result->recipients;
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
326
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
}
327
310
}
328
311
}
329
312
}
343
326
344
327
*plaintext = NULL;
345
328
while(true){
346
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
347
330
(size_t)plaintext_length,
348
331
plaintext_capacity);
349
332
if(plaintext_capacity == 0){
350
perror("incbuffer");
333
perror("adjustbuffer");
351
334
plaintext_length = -1;
352
335
goto decrypt_end;
353
336
}
399
382
fprintf(stderr, "GnuTLS: %s", string);
400
383
}
401
384
402
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
403
387
const char *seckeyfilename){
404
388
int ret;
405
389
423
407
}
424
408
425
409
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
427
411
if(ret != GNUTLS_E_SUCCESS){
428
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
413
from
441
425
}
442
426
443
427
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
445
429
GNUTLS_OPENPGP_FMT_BASE64);
446
430
if(ret != GNUTLS_E_SUCCESS){
447
431
fprintf(stderr,
453
437
}
454
438
455
439
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
457
441
if(ret != GNUTLS_E_SUCCESS){
458
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
443
" %s\n", safer_gnutls_strerror(ret));
460
444
goto globalfail;
461
445
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
463
447
if(ret != GNUTLS_E_SUCCESS){
464
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
449
safer_gnutls_strerror(ret));
466
450
goto globalfail;
467
451
}
468
452
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
454
471
455
return 0;
472
456
473
457
globalfail:
474
458
475
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
476
460
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
478
462
return -1;
479
463
}
480
464
481
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
482
467
int ret;
483
468
/* GnuTLS session creation */
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
490
470
if(ret != GNUTLS_E_SUCCESS){
491
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
472
safer_gnutls_strerror(ret));
494
474
495
475
{
496
476
const char *err;
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
504
478
if(ret != GNUTLS_E_SUCCESS){
505
479
fprintf(stderr, "Syntax error at: %s\n", err);
506
480
fprintf(stderr, "GnuTLS error: %s\n",
510
484
}
511
485
}
512
486
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
521
489
if(ret != GNUTLS_E_SUCCESS){
522
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
491
safer_gnutls_strerror(ret));
526
494
}
527
495
528
496
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
530
499
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
501
533
502
return 0;
534
503
}
540
509
/* Called when a Mandos server is found */
541
510
static int start_mandos_communication(const char *ip, uint16_t port,
542
511
AvahiIfIndex if_index,
543
int af){
544
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
545
514
ssize_t sret;
546
515
union {
547
516
struct sockaddr_in in;
548
517
struct sockaddr_in6 in6;
549
518
} to;
550
519
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
552
521
size_t buffer_length = 0;
553
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
554
524
size_t written;
555
int retval = -1;
525
int retval = 0;
556
526
gnutls_session_t session;
557
527
int pf; /* Protocol family */
558
528
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
529
switch(af){
567
530
case AF_INET6:
568
531
pf = PF_INET6;
572
535
break;
573
536
default:
574
537
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
538
return -1;
577
539
}
578
540
579
ret = init_gnutls_session(&session);
541
ret = init_gnutls_session(mc, &session);
580
542
if(ret != 0){
581
543
return -1;
582
544
}
588
550
589
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
552
if(tcp_sd < 0){
591
int e = errno;
592
553
perror("socket");
593
errno = e;
594
goto mandos_end;
595
}
596
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
554
return -1;
600
555
}
601
556
602
557
memset(&to, 0, sizeof(to));
603
558
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
559
to.in6.sin6_family = (uint16_t)af;
605
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
561
} else { /* IPv4 */
607
562
to.in.sin_family = (sa_family_t)af;
608
563
ret = inet_pton(af, ip, &to.in.sin_addr);
609
564
}
610
565
if(ret < 0 ){
611
int e = errno;
612
566
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
567
return -1;
615
568
}
616
569
if(ret == 0){
617
int e = errno;
618
570
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
571
return -1;
621
572
}
622
573
if(af == AF_INET6){
623
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
630
581
if(if_index == AVAHI_IF_UNSPEC){
631
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
583
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
584
return -1;
635
585
}
636
586
/* Set the network interface number as scope */
637
587
to.in6.sin6_scope_id = (uint32_t)if_index;
642
592
-Wunreachable-code */
643
593
}
644
594
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
649
650
595
if(debug){
651
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
597
char interface[IF_NAMESIZE];
679
624
}
680
625
}
681
626
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
627
if(af == AF_INET6){
688
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
629
} else {
690
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
631
}
692
632
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
633
perror("connect");
634
return -1;
704
635
}
705
636
706
637
const char *out = mandos_protocol_version;
710
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
642
out_size - written));
712
643
if(ret == -1){
713
int e = errno;
714
644
perror("write");
715
errno = e;
645
retval = -1;
716
646
goto mandos_end;
717
647
}
718
648
written += (size_t)ret;
726
656
break;
727
657
}
728
658
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
659
}
735
660
736
661
if(debug){
737
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
663
}
739
664
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
666
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
667
do{
753
668
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
758
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
670
760
671
if(ret != GNUTLS_E_SUCCESS){
762
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
674
gnutls_perror(ret);
764
675
}
765
errno = EPROTO;
676
retval = -1;
766
677
goto mandos_end;
767
678
}
768
679
774
685
}
775
686
776
687
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
784
689
buffer_capacity);
785
690
if(buffer_capacity == 0){
786
int e = errno;
787
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
691
perror("adjustbuffer");
692
retval = -1;
794
693
goto mandos_end;
795
694
}
796
695
805
704
case GNUTLS_E_AGAIN:
806
705
break;
807
706
case GNUTLS_E_REHANDSHAKE:
808
do {
707
do{
809
708
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
710
if(ret < 0){
817
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
712
gnutls_perror(ret);
819
errno = EPROTO;
713
retval = -1;
820
714
goto mandos_end;
821
715
}
822
716
break;
823
717
default:
824
718
fprintf(stderr, "Unknown error while reading data from"
825
719
" encrypted session with Mandos server\n");
720
retval = -1;
826
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
828
722
goto mandos_end;
829
723
}
830
724
} else {
836
730
fprintf(stderr, "Closing TLS session\n");
837
731
}
838
732
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
851
734
852
735
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
855
737
buffer_length,
856
738
&decrypted_buffer);
857
739
if(decrypted_buffer_size >= 0){
858
859
740
written = 0;
860
741
while(written < (size_t) decrypted_buffer_size){
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
742
ret = (int)fwrite(decrypted_buffer + written, 1,
867
743
(size_t)decrypted_buffer_size - written,
868
744
stdout);
869
745
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
746
if(debug){
872
747
fprintf(stderr, "Error writing encrypted data: %s\n",
873
748
strerror(errno));
874
749
}
875
errno = e;
876
goto mandos_end;
750
retval = -1;
751
break;
877
752
}
878
753
written += (size_t)ret;
879
754
}
880
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
881
758
}
759
} else {
760
retval = -1;
882
761
}
883
762
884
763
/* Shutdown procedure */
885
764
886
765
mandos_end:
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
903
retval = -1;
904
}
905
errno = e;
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
906
770
}
771
gnutls_deinit(session);
907
772
return retval;
908
773
}
909
774
920
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
787
flags,
923
AVAHI_GCC_UNUSED void* userdata){
788
void* userdata){
789
mandos_context *mc = userdata;
924
790
assert(r);
925
791
926
792
/* Called whenever a service has been resolved successfully or
927
793
timed out */
928
794
929
if(quit_now){
930
return;
931
}
932
933
795
switch(event){
934
796
default:
935
797
case AVAHI_RESOLVER_FAILURE:
936
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
800
avahi_strerror(avahi_server_errno(mc->server)));
939
801
break;
940
802
941
803
case AVAHI_RESOLVER_FOUND:
947
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
810
ip, (intmax_t)interface, port);
949
811
}
950
int ret = start_mandos_communication(ip, port, interface,
812
int ret = start_mandos_communication(ip, port, interface, mc,
951
813
avahi_proto_to_af(proto));
952
814
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
815
avahi_simple_poll_quit(mc->simple_poll);
954
816
}
955
817
}
956
818
}
966
828
const char *domain,
967
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
830
flags,
969
AVAHI_GCC_UNUSED void* userdata){
831
void* userdata){
832
mandos_context *mc = userdata;
970
833
assert(b);
971
834
972
835
/* Called whenever a new services becomes available on the LAN or
973
836
is removed from the LAN */
974
837
975
if(quit_now){
976
return;
977
}
978
979
838
switch(event){
980
839
default:
981
840
case AVAHI_BROWSER_FAILURE:
982
841
983
842
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
986
845
return;
987
846
988
847
case AVAHI_BROWSER_NEW:
991
850
the callback function is called the Avahi server will free the
992
851
resolver for us. */
993
852
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
997
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
858
name, avahi_strerror(avahi_server_errno(mc->server)));
999
859
break;
1000
860
1001
861
case AVAHI_BROWSER_REMOVE:
1010
870
}
1011
871
}
1012
872
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
1020
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
1024
errno = old_errno;
1025
}
1026
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1120
}
1121
1122
873
int main(int argc, char *argv[]){
1123
874
AvahiSServiceBrowser *sb = NULL;
1124
875
int error;
1125
876
int ret;
1126
877
intmax_t tmpmax;
1127
char *tmp;
878
int numchars;
1128
879
int exitcode = EXIT_SUCCESS;
1129
const char *interface = "";
880
const char *interface = "eth0";
1130
881
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
882
int sd;
1133
883
uid_t uid;
1134
884
gid_t gid;
885
char *connect_to = NULL;
1135
886
char tempdir[] = "/tmp/mandosXXXXXX";
1136
887
bool tempdir_created = false;
1137
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
889
const char *seckey = PATHDIR "/" SECKEY;
1139
890
const char *pubkey = PATHDIR "/" PUBKEY;
1140
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1141
895
bool gnutls_initialized = false;
1142
896
bool gpgme_initialized = false;
1143
float delay = 2.5f;
1144
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
/* Lower any group privileges we might have, just to be safe */
1152
errno = 0;
1153
ret = setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
/* Lower user privileges (temporarily) */
1159
errno = 0;
1160
ret = seteuid(uid);
1161
if(ret == -1){
1162
perror("seteuid");
1163
}
1164
1165
if(quit_now){
1166
goto end;
1167
}
897
double delay = 2.5;
1168
898
1169
899
{
1170
900
struct argp_option options[] = {
1200
930
.arg = "SECONDS",
1201
931
.doc = "Maximum delay to wait for interface startup",
1202
932
.group = 2 },
1203
/*
1204
* These reproduce what we would get without ARGP_NO_HELP
1205
*/
1206
{ .name = "help", .key = '?',
1207
.doc = "Give this help list", .group = -1 },
1208
{ .name = "usage", .key = -3,
1209
.doc = "Give a short usage message", .group = -1 },
1210
{ .name = "version", .key = 'V',
1211
.doc = "Print program version", .group = -1 },
1212
933
{ .name = NULL }
1213
934
};
1214
935
1215
936
error_t parse_opt(int key, char *arg,
1216
937
struct argp_state *state){
1217
errno = 0;
1218
938
switch(key){
1219
939
case 128: /* --debug */
1220
940
debug = true;
1232
952
pubkey = arg;
1233
953
break;
1234
954
case 129: /* --dh-bits */
1235
errno = 0;
1236
tmpmax = strtoimax(arg, &tmp, 10);
1237
if(errno != 0 or tmp == arg or *tmp != '\0'
1238
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1239
argp_error(state, "Bad number of DH bits");
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1240
960
}
1241
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1242
962
break;
1244
964
mc.priority = arg;
1245
965
break;
1246
966
case 131: /* --delay */
1247
errno = 0;
1248
delay = strtof(arg, &tmp);
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
argp_error(state, "Bad delay");
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
1251
971
}
1252
972
break;
1253
/*
1254
* These reproduce what we would get without ARGP_NO_HELP
1255
*/
1256
case '?': /* --help */
1257
argp_state_help(state, state->out_stream,
1258
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1259
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1260
case -3: /* --usage */
1261
argp_state_help(state, state->out_stream,
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1265
exit(argp_err_exit_status);
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1266
976
break;
1267
977
default:
1268
978
return ARGP_ERR_UNKNOWN;
1269
979
}
1270
return errno;
980
return 0;
1271
981
}
1272
982
1273
983
struct argp argp = { .options = options, .parser = parse_opt,
1274
984
.args_doc = "",
1275
985
.doc = "Mandos client -- Get and decrypt"
1276
986
" passwords from a Mandos server" };
1277
ret = argp_parse(&argp, argc, argv,
1278
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1279
switch(ret){
1280
case 0:
1281
break;
1282
case ENOMEM:
1283
default:
1284
errno = ret;
1285
perror("argp_parse");
1286
exitcode = EX_OSERR;
1287
goto end;
1288
case EINVAL:
1289
exitcode = EX_USAGE;
1290
goto end;
1291
}
1292
}
1293
1294
if(not debug){
1295
avahi_set_log_function(empty_log);
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
1318
990
exitcode = EXIT_FAILURE;
1319
991
goto end;
1320
992
}
1321
993
}
1322
994
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
from the signal handler */
1325
/* Initialize the pseudo-RNG for Avahi */
1326
srand((unsigned int) time(NULL));
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1330
exitcode = EX_UNAVAILABLE;
1331
goto end;
1332
}
1333
1334
sigemptyset(&sigterm_action.sa_mask);
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
if(ret == -1){
1337
perror("sigaddset");
1338
exitcode = EX_OSERR;
1339
goto end;
1340
}
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
if(ret == -1){
1343
perror("sigaddset");
1344
exitcode = EX_OSERR;
1345
goto end;
1346
}
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
if(ret == -1){
1349
perror("sigaddset");
1350
exitcode = EX_OSERR;
1351
goto end;
1352
}
1353
/* Need to check if the handler is SIG_IGN before handling:
1354
| [[info:libc:Initial Signal Actions]] |
1355
| [[info:libc:Basic Signal Handling]] |
1356
*/
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
if(ret == -1){
1359
perror("sigaction");
1360
return EX_OSERR;
1361
}
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
if(ret == -1){
1365
perror("sigaction");
1366
exitcode = EX_OSERR;
1367
goto end;
1368
}
1369
}
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
if(ret == -1){
1372
perror("sigaction");
1373
return EX_OSERR;
1374
}
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
if(ret == -1){
1378
perror("sigaction");
1379
exitcode = EX_OSERR;
1380
goto end;
1381
}
1382
}
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
if(ret == -1){
1385
perror("sigaction");
1386
return EX_OSERR;
1387
}
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
if(ret == -1){
1391
perror("sigaction");
1392
exitcode = EX_OSERR;
1393
goto end;
1394
}
1395
}
1396
1397
995
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
996
if(interface[0] != '\0'){
1417
997
#ifdef __linux__
1418
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1420
1000
ret = klogctl(8, NULL, 5);
1421
1001
bool restore_loglevel = true;
1422
1002
if(ret == -1){
1423
1003
restore_loglevel = false;
1424
1004
perror("klogctl");
1425
1005
}
1426
#endif /* __linux__ */
1006
#endif
1427
1007
1428
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
1009
if(sd < 0){
1430
1010
perror("socket");
1431
exitcode = EX_OSERR;
1011
exitcode = EXIT_FAILURE;
1432
1012
#ifdef __linux__
1433
1013
if(restore_loglevel){
1434
1014
ret = klogctl(7, NULL, 0);
1436
1016
perror("klogctl");
1437
1017
}
1438
1018
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1019
#endif
1446
1020
goto end;
1447
1021
}
1448
1022
strcpy(network.ifr_name, interface);
1456
1030
perror("klogctl");
1457
1031
}
1458
1032
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1467
1035
goto end;
1468
1036
}
1469
1037
if((network.ifr_flags & IFF_UP) == 0){
1470
1038
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
1040
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1477
1043
#ifdef __linux__
1478
1044
if(restore_loglevel){
1479
1045
ret = klogctl(7, NULL, 0);
1481
1047
perror("klogctl");
1482
1048
}
1483
1049
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1050
#endif
1491
1051
goto end;
1492
1052
}
1493
1053
}
1505
1065
perror("nanosleep");
1506
1066
}
1507
1067
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1514
1071
}
1515
1072
#ifdef __linux__
1516
1073
if(restore_loglevel){
1520
1077
perror("klogctl");
1521
1078
}
1522
1079
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
1532
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
1539
}
1540
1541
if(quit_now){
1542
goto end;
1543
}
1544
1545
ret = init_gnutls_global(pubkey, seckey);
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1546
1098
if(ret == -1){
1547
1099
fprintf(stderr, "init_gnutls_global failed\n");
1548
exitcode = EX_UNAVAILABLE;
1100
exitcode = EXIT_FAILURE;
1549
1101
goto end;
1550
1102
} else {
1551
1103
gnutls_initialized = true;
1552
1104
}
1553
1105
1554
if(quit_now){
1555
goto end;
1556
}
1557
1558
tempdir_created = true;
1559
1106
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
1107
perror("mkdtemp");
1562
1108
goto end;
1563
1109
}
1564
1565
if(quit_now){
1566
goto end;
1567
}
1568
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1570
1113
fprintf(stderr, "init_gpgme failed\n");
1571
exitcode = EX_UNAVAILABLE;
1114
exitcode = EXIT_FAILURE;
1572
1115
goto end;
1573
1116
} else {
1574
1117
gpgme_initialized = true;
1575
1118
}
1576
1119
1577
if(quit_now){
1578
goto end;
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1579
1127
}
1580
1128
1581
1129
if(connect_to != NULL){
1584
1132
char *address = strrchr(connect_to, ':');
1585
1133
if(address == NULL){
1586
1134
fprintf(stderr, "No colon in address\n");
1587
exitcode = EX_USAGE;
1588
goto end;
1589
}
1590
1591
if(quit_now){
1592
goto end;
1593
}
1594
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1595
1138
uint16_t port;
1596
errno = 0;
1597
tmpmax = strtoimax(address+1, &tmp, 10);
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1600
1142
fprintf(stderr, "Bad port number\n");
1601
exitcode = EX_USAGE;
1602
goto end;
1603
}
1604
1605
if(quit_now){
1606
goto end;
1607
}
1608
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1609
1146
port = (uint16_t)tmpmax;
1610
1147
*address = '\0';
1611
1148
address = connect_to;
1616
1153
} else {
1617
1154
af = AF_INET;
1618
1155
}
1619
1620
if(quit_now){
1621
goto end;
1622
}
1623
1624
while(not quit_now){
1625
ret = start_mandos_communication(address, port, if_index, af);
1626
if(quit_now or ret == 0){
1627
break;
1628
}
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
1633
1161
exitcode = EXIT_SUCCESS;
1634
1162
}
1635
1636
1163
goto end;
1637
1164
}
1638
1165
1639
if(quit_now){
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
1640
1178
goto end;
1641
1179
}
1642
1180
1662
1200
if(mc.server == NULL){
1663
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
1202
avahi_strerror(error));
1665
exitcode = EX_UNAVAILABLE;
1666
goto end;
1667
}
1668
1669
if(quit_now){
1203
exitcode = EXIT_FAILURE;
1670
1204
goto end;
1671
1205
}
1672
1206
1673
1207
/* Create the Avahi service browser */
1674
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1677
1211
if(sb == NULL){
1678
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1679
1213
avahi_strerror(avahi_server_errno(mc.server)));
1680
exitcode = EX_UNAVAILABLE;
1681
goto end;
1682
}
1683
1684
if(quit_now){
1214
exitcode = EXIT_FAILURE;
1685
1215
goto end;
1686
1216
}
1687
1217
1719
1249
gpgme_release(mc.ctx);
1720
1250
}
1721
1251
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
1252
/* Removes the temp directory used by GPGME */
1755
1253
if(tempdir_created){
1756
1254
DIR *d;
1795
1293
}
1796
1294
}
1797
1295
1798
if(quit_now){
1799
sigemptyset(&old_sigterm_action.sa_mask);
1800
old_sigterm_action.sa_handler = SIG_DFL;
1801
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1802
&old_sigterm_action,
1803
NULL));
1804
if(ret == -1){
1805
perror("sigaction");
1806
}
1807
do {
1808
ret = raise(signal_received);
1809
} while(ret != 0 and errno == EINTR);
1810
if(ret != 0){
1811
perror("raise");
1812
abort();
1813
}
1814
TEMP_FAILURE_RETRY(pause());
1815
}
1816
1817
1296
return exitcode;
1818
1297
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0