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» Revision
269.1.2
(compared to revision 237.2.39)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2010-08-11 20:06:18 UTC
- mto: (237.2.182 mandos-local)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100811200618-1uuv7p6cmrb2cmxu
* plugins.d/mandos-client.c: Added debug output.
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
47
srand(), strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
53
56
#include <sys/stat.h> /* open() */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
58
inet_pton(), connect() */
57
59
#include <fcntl.h> /* open() */
58
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
61
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
64
#include <assert.h> /* assert() */
62
65
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
64
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
68
SIOCSIFFLAGS, if_indextoname(),
66
69
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
68
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
getuid(), getgid(), setuid(),
70
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
71
76
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
77
#include <iso646.h> /* not, or, and */
73
78
#include <argp.h> /* struct argp_option, error_t, struct
74
79
argp_state, struct argp,
75
80
argp_parse(), ARGP_KEY_ARG,
76
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
77
89
78
90
/* Avahi */
79
91
/* All Avahi types, constants and functions
113
125
static const char mandos_protocol_version[] = "1";
114
126
const char *argp_program_version = "mandos-client " VERSION;
115
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
static const char sys_class_net[] = "/sys/class/net";
129
char *connect_to = NULL;
116
130
117
131
/* Used for passing in values through the Avahi callback functions */
118
132
typedef struct {
125
139
gpgme_ctx_t ctx;
126
140
} mandos_context;
127
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
128
150
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "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,
131
153
* "buffer_length" is how much is already used.
132
154
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t incbuffer(char **buffer, size_t buffer_length,
134
156
size_t buffer_capacity){
135
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
167
/*
146
168
* Initialize GPGME.
147
169
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
170
static bool init_gpgme(const char *seckey,
149
171
const char *pubkey, const char *tempdir){
150
int ret;
151
172
gpgme_error_t rc;
152
173
gpgme_engine_info_t engine_info;
153
174
154
175
155
176
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
177
* Helper function to insert pub and seckey to the engine keyring.
157
178
*/
158
179
bool import_key(const char *filename){
180
int ret;
159
181
int fd;
160
182
gpgme_data_t pgp_data;
161
183
172
194
return false;
173
195
}
174
196
175
rc = gpgme_op_import(mc->ctx, pgp_data);
197
rc = gpgme_op_import(mc.ctx, pgp_data);
176
198
if(rc != GPG_ERR_NO_ERROR){
177
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
200
gpgme_strsource(rc), gpgme_strerror(rc));
188
210
}
189
211
190
212
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
213
fprintf(stderr, "Initializing GPGME\n");
192
214
}
193
215
194
216
/* Init GPGME */
221
243
}
222
244
223
245
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
246
rc = gpgme_new(&(mc.ctx));
225
247
if(rc != GPG_ERR_NO_ERROR){
226
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
249
gpgme_strsource(rc), gpgme_strerror(rc));
232
254
return false;
233
255
}
234
256
235
return true;
257
return true;
236
258
}
237
259
238
260
/*
239
261
* Decrypt OpenPGP data.
240
262
* Returns -1 on error
241
263
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
265
size_t crypto_size,
245
266
char **plaintext){
246
267
gpgme_data_t dh_crypto, dh_plain;
273
294
274
295
/* Decrypt data from the cryptotext data buffer to the plaintext
275
296
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
277
298
if(rc != GPG_ERR_NO_ERROR){
278
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
300
gpgme_strsource(rc), gpgme_strerror(rc));
280
301
plaintext_length = -1;
281
302
if(debug){
282
303
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
304
result = gpgme_op_decrypt_result(mc.ctx);
284
305
if(result == NULL){
285
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
307
} else {
293
314
}
294
315
gpgme_recipient_t recipient;
295
316
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
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;
306
325
}
307
326
}
308
327
}
322
341
323
342
*plaintext = NULL;
324
343
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
344
plaintext_capacity = incbuffer(plaintext,
326
345
(size_t)plaintext_length,
327
346
plaintext_capacity);
328
347
if(plaintext_capacity == 0){
329
perror("adjustbuffer");
348
perror("incbuffer");
330
349
plaintext_length = -1;
331
350
goto decrypt_end;
332
351
}
364
383
return plaintext_length;
365
384
}
366
385
367
static const char * safer_gnutls_strerror(int value) {
386
static const char * safer_gnutls_strerror(int value){
368
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
388
-Wunreachable-code */
370
389
if(ret == NULL)
378
397
fprintf(stderr, "GnuTLS: %s", string);
379
398
}
380
399
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
400
static int init_gnutls_global(const char *pubkeyfilename,
383
401
const char *seckeyfilename){
384
402
int ret;
385
403
388
406
}
389
407
390
408
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
409
if(ret != GNUTLS_E_SUCCESS){
392
410
fprintf(stderr, "GnuTLS global_init: %s\n",
393
411
safer_gnutls_strerror(ret));
394
412
return -1;
403
421
}
404
422
405
423
/* OpenPGP credentials */
406
gnutls_certificate_allocate_credentials(&mc->cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
407
425
if(ret != GNUTLS_E_SUCCESS){
408
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
427
from
428
-Wunreachable-code
429
*/
412
430
safer_gnutls_strerror(ret));
413
431
gnutls_global_deinit();
414
432
return -1;
421
439
}
422
440
423
441
ret = gnutls_certificate_set_openpgp_key_file
424
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
425
443
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
444
if(ret != GNUTLS_E_SUCCESS){
427
445
fprintf(stderr,
428
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
433
451
}
434
452
435
453
/* GnuTLS server initialization */
436
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
438
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
457
" %s\n", safer_gnutls_strerror(ret));
440
458
goto globalfail;
441
459
}
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
444
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
463
safer_gnutls_strerror(ret));
446
464
goto globalfail;
447
465
}
448
466
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
450
468
451
469
return 0;
452
470
453
471
globalfail:
454
472
455
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
456
474
gnutls_global_deinit();
457
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_dh_params_deinit(mc.dh_params);
458
476
return -1;
459
477
}
460
478
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
463
480
int ret;
464
481
/* GnuTLS session creation */
465
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);
466
488
if(ret != GNUTLS_E_SUCCESS){
467
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
490
safer_gnutls_strerror(ret));
470
492
471
493
{
472
494
const char *err;
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
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){
475
503
fprintf(stderr, "Syntax error at: %s\n", err);
476
504
fprintf(stderr, "GnuTLS error: %s\n",
477
505
safer_gnutls_strerror(ret));
480
508
}
481
509
}
482
510
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
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){
486
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
521
safer_gnutls_strerror(ret));
488
522
gnutls_deinit(*session);
490
524
}
491
525
492
526
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
495
528
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
497
530
498
531
return 0;
499
532
}
505
538
/* Called when a Mandos server is found */
506
539
static int start_mandos_communication(const char *ip, uint16_t port,
507
540
AvahiIfIndex if_index,
508
mandos_context *mc){
509
int ret, tcp_sd;
541
int af){
542
int ret, tcp_sd = -1;
510
543
ssize_t sret;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
512
548
char *buffer = NULL;
513
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
514
550
size_t buffer_length = 0;
515
551
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
517
552
size_t written;
518
int retval = 0;
519
char interface[IF_NAMESIZE];
553
int retval = -1;
520
554
gnutls_session_t session;
521
522
ret = init_gnutls_session(mc, &session);
555
int pf; /* Protocol family */
556
557
if(quit_now){
558
return -1;
559
}
560
561
switch(af){
562
case AF_INET6:
563
pf = PF_INET6;
564
break;
565
case AF_INET:
566
pf = PF_INET;
567
break;
568
default:
569
fprintf(stderr, "Bad address family: %d\n", af);
570
return -1;
571
}
572
573
ret = init_gnutls_session(&session);
523
574
if(ret != 0){
524
575
return -1;
525
576
}
526
577
527
578
if(debug){
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
529
580
"\n", ip, port);
530
581
}
531
582
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
584
if(tcp_sd < 0){
534
585
perror("socket");
535
return -1;
586
goto mandos_end;
536
587
}
537
588
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
589
if(quit_now){
590
goto mandos_end;
544
591
}
545
592
546
593
memset(&to, 0, sizeof(to));
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
594
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
600
}
551
601
if(ret < 0 ){
552
602
perror("inet_pton");
553
return -1;
603
goto mandos_end;
554
604
}
555
605
if(ret == 0){
556
606
fprintf(stderr, "Bad address: %s\n", ip);
557
return -1;
607
goto mandos_end;
558
608
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
if(af == AF_INET6){
610
to.in6.sin6_port = htons(port); /* Spurious warnings from
611
-Wconversion and
612
-Wunreachable-code */
613
614
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
615
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
616
-Wunreachable-code*/
617
if(if_index == AVAHI_IF_UNSPEC){
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
" without a network interface\n");
620
goto mandos_end;
621
}
622
/* Set the network interface number as scope */
623
to.in6.sin6_scope_id = (uint32_t)if_index;
624
}
625
} else {
626
to.in.sin_port = htons(port); /* Spurious warnings from
560
627
-Wconversion and
561
628
-Wunreachable-code */
629
}
562
630
563
to.in6.sin6_scope_id = (uint32_t)if_index;
631
if(quit_now){
632
goto mandos_end;
633
}
564
634
565
635
if(debug){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
636
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
char interface[IF_NAMESIZE];
638
if(if_indextoname((unsigned int)if_index, interface) == NULL){
639
perror("if_indextoname");
640
} else {
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
642
ip, interface, port);
643
}
644
} else {
645
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
646
port);
647
}
648
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
649
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
650
const char *pcret;
651
if(af == AF_INET6){
652
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
653
sizeof(addrstr));
654
} else {
655
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
656
sizeof(addrstr));
657
}
658
if(pcret == NULL){
571
659
perror("inet_ntop");
572
660
} else {
573
661
if(strcmp(addrstr, ip) != 0){
576
664
}
577
665
}
578
666
579
ret = connect(tcp_sd, &to.in, sizeof(to));
667
if(quit_now){
668
goto mandos_end;
669
}
670
671
if(af == AF_INET6){
672
ret = connect(tcp_sd, &to.in6, sizeof(to));
673
} else {
674
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
675
}
580
676
if(ret < 0){
581
677
perror("connect");
582
return -1;
678
goto mandos_end;
679
}
680
681
if(quit_now){
682
goto mandos_end;
583
683
}
584
684
585
685
const char *out = mandos_protocol_version;
590
690
out_size - written));
591
691
if(ret == -1){
592
692
perror("write");
593
retval = -1;
594
693
goto mandos_end;
595
694
}
596
695
written += (size_t)ret;
604
703
break;
605
704
}
606
705
}
706
707
if(quit_now){
708
goto mandos_end;
709
}
607
710
}
608
711
609
712
if(debug){
610
713
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
714
}
612
715
716
if(quit_now){
717
goto mandos_end;
718
}
719
613
720
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
721
615
do{
722
if(quit_now){
723
goto mandos_end;
724
}
725
726
do {
616
727
ret = gnutls_handshake(session);
728
if(quit_now){
729
goto mandos_end;
730
}
617
731
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
732
619
733
if(ret != GNUTLS_E_SUCCESS){
621
735
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
622
736
gnutls_perror(ret);
623
737
}
624
retval = -1;
625
738
goto mandos_end;
626
739
}
627
740
628
741
/* Read OpenPGP packet that contains the wanted password */
629
742
630
743
if(debug){
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
744
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
632
745
ip);
633
746
}
634
747
635
748
while(true){
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
750
if(quit_now){
751
goto mandos_end;
752
}
753
754
buffer_capacity = incbuffer(&buffer, buffer_length,
637
755
buffer_capacity);
638
756
if(buffer_capacity == 0){
639
perror("adjustbuffer");
640
retval = -1;
757
perror("incbuffer");
758
goto mandos_end;
759
}
760
761
if(quit_now){
641
762
goto mandos_end;
642
763
}
643
764
652
773
case GNUTLS_E_AGAIN:
653
774
break;
654
775
case GNUTLS_E_REHANDSHAKE:
655
do{
776
do {
656
777
ret = gnutls_handshake(session);
778
779
if(quit_now){
780
goto mandos_end;
781
}
657
782
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
783
if(ret < 0){
659
784
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
660
785
gnutls_perror(ret);
661
retval = -1;
662
786
goto mandos_end;
663
787
}
664
788
break;
665
789
default:
666
790
fprintf(stderr, "Unknown error while reading data from"
667
791
" encrypted session with Mandos server\n");
668
retval = -1;
669
792
gnutls_bye(session, GNUTLS_SHUT_RDWR);
670
793
goto mandos_end;
671
794
}
678
801
fprintf(stderr, "Closing TLS session\n");
679
802
}
680
803
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
804
if(quit_now){
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
810
if(quit_now){
811
goto mandos_end;
812
}
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
814
683
815
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
816
ssize_t decrypted_buffer_size;
817
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
818
buffer_length,
686
819
&decrypted_buffer);
687
820
if(decrypted_buffer_size >= 0){
821
688
822
written = 0;
689
823
while(written < (size_t) decrypted_buffer_size){
824
if(quit_now){
825
goto mandos_end;
826
}
827
690
828
ret = (int)fwrite(decrypted_buffer + written, 1,
691
829
(size_t)decrypted_buffer_size - written,
692
830
stdout);
695
833
fprintf(stderr, "Error writing encrypted data: %s\n",
696
834
strerror(errno));
697
835
}
698
retval = -1;
699
break;
836
goto mandos_end;
700
837
}
701
838
written += (size_t)ret;
702
839
}
703
free(decrypted_buffer);
704
} else {
705
retval = -1;
840
retval = 0;
706
841
}
707
} else {
708
retval = -1;
709
842
}
710
843
711
844
/* Shutdown procedure */
712
845
713
846
mandos_end:
847
free(decrypted_buffer);
714
848
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
716
852
if(ret == -1){
717
853
perror("close");
718
854
}
719
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
720
859
return retval;
721
860
}
722
861
723
862
static void resolve_callback(AvahiSServiceResolver *r,
724
863
AvahiIfIndex interface,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
864
AvahiProtocol proto,
726
865
AvahiResolverEvent event,
727
866
const char *name,
728
867
const char *type,
733
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
734
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
735
874
flags,
736
void* userdata) {
737
mandos_context *mc = userdata;
875
AVAHI_GCC_UNUSED void* userdata){
738
876
assert(r);
739
877
740
878
/* Called whenever a service has been resolved successfully or
741
879
timed out */
742
880
743
switch(event) {
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
744
886
default:
745
887
case AVAHI_RESOLVER_FAILURE:
746
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
748
avahi_strerror(avahi_server_errno(mc->server)));
890
avahi_strerror(avahi_server_errno(mc.server)));
749
891
break;
750
892
751
893
case AVAHI_RESOLVER_FOUND:
757
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
900
ip, (intmax_t)interface, port);
759
901
}
760
int ret = start_mandos_communication(ip, port, interface, mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
761
904
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
905
avahi_simple_poll_quit(mc.simple_poll);
763
906
}
764
907
}
765
908
}
766
909
avahi_s_service_resolver_free(r);
767
910
}
768
911
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
912
static void browse_callback(AvahiSServiceBrowser *b,
913
AvahiIfIndex interface,
914
AvahiProtocol protocol,
915
AvahiBrowserEvent event,
916
const char *name,
917
const char *type,
918
const char *domain,
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
flags,
921
AVAHI_GCC_UNUSED void* userdata){
780
922
assert(b);
781
923
782
924
/* Called whenever a new services becomes available on the LAN or
783
925
is removed from the LAN */
784
926
785
switch(event) {
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
786
932
default:
787
933
case AVAHI_BROWSER_FAILURE:
788
934
789
935
fprintf(stderr, "(Avahi browser) %s\n",
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
792
938
return;
793
939
794
940
case AVAHI_BROWSER_NEW:
797
943
the callback function is called the Avahi server will free the
798
944
resolver for us. */
799
945
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
804
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
805
name, avahi_strerror(avahi_server_errno(mc->server)));
950
name, avahi_strerror(avahi_server_errno(mc.server)));
806
951
break;
807
952
808
953
case AVAHI_BROWSER_REMOVE:
817
962
}
818
963
}
819
964
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
977
}
978
979
/*
980
* This function determines if a directory entry in /sys/class/net
981
* corresponds to an acceptable network device.
982
* (This function is passed to scandir(3) as a filter function.)
983
*/
984
int good_interface(const struct dirent *if_entry){
985
ssize_t ssret;
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
988
if_entry->d_name);
989
if(ret < 0){
990
perror("asprintf");
991
return 0;
992
}
993
if(if_entry->d_name[0] == '.'){
994
return 0;
995
}
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
997
if(flags_fd == -1){
998
perror("open");
999
return 0;
1000
}
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1007
perror("malloc");
1008
close(flags_fd);
1009
return 0;
1010
}
1011
while(to_read > 0){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1013
(size_t)to_read));
1014
if(ssret == -1){
1015
perror("read");
1016
free(flagstring);
1017
close(flags_fd);
1018
return 0;
1019
}
1020
to_read -= ssret;
1021
if(ssret == 0){
1022
break;
1023
}
1024
}
1025
close(flags_fd);
1026
intmax_t tmpmax;
1027
char *tmp;
1028
errno = 0;
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1033
if(debug){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1036
}
1037
free(flagstring);
1038
return 0;
1039
}
1040
free(flagstring);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1044
if(debug){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1046
if_entry->d_name);
1047
}
1048
return 0;
1049
}
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1052
if(debug){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1054
if_entry->d_name);
1055
}
1056
return 1;
1057
}
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1060
if(debug){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1062
if_entry->d_name);
1063
}
1064
return 0;
1065
}
1066
/* Accept this device */
1067
if(debug){
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1069
if_entry->d_name);
1070
}
1071
return 1;
1072
}
1073
820
1074
int main(int argc, char *argv[]){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
829
int sd;
830
uid_t uid;
831
gid_t gid;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
844
{
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
851
.group = 1 },
852
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
856
.group = 1 },
857
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
860
.group = 1 },
861
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
864
.group = 2 },
865
{ .name = "dh-bits", .key = 129,
866
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
869
.group = 2 },
870
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
874
{ .name = NULL }
875
};
876
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
881
debug = true;
882
break;
883
case 'c': /* --connect */
884
connect_to = arg;
885
break;
886
case 'i': /* --interface */
887
interface = arg;
888
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
900
exit(EXIT_FAILURE);
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
break;
904
case 130: /* --priority */
905
mc.priority = arg;
906
break;
907
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
910
break;
911
default:
912
return ARGP_ERR_UNKNOWN;
913
}
914
return 0;
915
}
916
917
struct argp argp = { .options = options, .parser = parse_opt,
918
.args_doc = "",
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
959
uid = getuid();
960
gid = getgid();
961
962
ret = setuid(uid);
963
if(ret == -1){
964
perror("setuid");
965
}
966
967
setgid(gid);
968
if(ret == -1){
969
perror("setgid");
970
}
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
1075
AvahiSServiceBrowser *sb = NULL;
1076
int error;
1077
int ret;
1078
intmax_t tmpmax;
1079
char *tmp;
1080
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
1082
struct ifreq network;
1083
int sd = -1;
1084
bool take_down_interface = false;
1085
uid_t uid;
1086
gid_t gid;
1087
char tempdir[] = "/tmp/mandosXXXXXX";
1088
bool tempdir_created = false;
1089
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
const char *seckey = PATHDIR "/" SECKEY;
1091
const char *pubkey = PATHDIR "/" PUBKEY;
1092
1093
bool gnutls_initialized = false;
1094
bool gpgme_initialized = false;
1095
float delay = 2.5f;
1096
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1098
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1099
1100
uid = getuid();
1101
gid = getgid();
1102
1103
/* Lower any group privileges we might have, just to be safe */
1104
errno = 0;
1105
ret = setgid(gid);
1106
if(ret == -1){
1107
perror("setgid");
1108
}
1109
1110
/* Lower user privileges (temporarily) */
1111
errno = 0;
1112
ret = seteuid(uid);
1113
if(ret == -1){
1114
perror("seteuid");
1115
}
1116
1117
if(quit_now){
1118
goto end;
1119
}
1120
1121
{
1122
struct argp_option options[] = {
1123
{ .name = "debug", .key = 128,
1124
.doc = "Debug mode", .group = 3 },
1125
{ .name = "connect", .key = 'c',
1126
.arg = "ADDRESS:PORT",
1127
.doc = "Connect directly to a specific Mandos server",
1128
.group = 1 },
1129
{ .name = "interface", .key = 'i',
1130
.arg = "NAME",
1131
.doc = "Network interface that will be used to search for"
1132
" Mandos servers",
1133
.group = 1 },
1134
{ .name = "seckey", .key = 's',
1135
.arg = "FILE",
1136
.doc = "OpenPGP secret key file base name",
1137
.group = 1 },
1138
{ .name = "pubkey", .key = 'p',
1139
.arg = "FILE",
1140
.doc = "OpenPGP public key file base name",
1141
.group = 2 },
1142
{ .name = "dh-bits", .key = 129,
1143
.arg = "BITS",
1144
.doc = "Bit length of the prime number used in the"
1145
" Diffie-Hellman key exchange",
1146
.group = 2 },
1147
{ .name = "priority", .key = 130,
1148
.arg = "STRING",
1149
.doc = "GnuTLS priority string for the TLS handshake",
1150
.group = 1 },
1151
{ .name = "delay", .key = 131,
1152
.arg = "SECONDS",
1153
.doc = "Maximum delay to wait for interface startup",
1154
.group = 2 },
1155
{ .name = NULL }
1156
};
1157
1158
error_t parse_opt(int key, char *arg,
1159
struct argp_state *state){
1160
switch(key){
1161
case 128: /* --debug */
1162
debug = true;
1163
break;
1164
case 'c': /* --connect */
1165
connect_to = arg;
1166
break;
1167
case 'i': /* --interface */
1168
interface = arg;
1169
break;
1170
case 's': /* --seckey */
1171
seckey = arg;
1172
break;
1173
case 'p': /* --pubkey */
1174
pubkey = arg;
1175
break;
1176
case 129: /* --dh-bits */
1177
errno = 0;
1178
tmpmax = strtoimax(arg, &tmp, 10);
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1181
fprintf(stderr, "Bad number of DH bits\n");
1182
exit(EXIT_FAILURE);
1183
}
1184
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1185
break;
1186
case 130: /* --priority */
1187
mc.priority = arg;
1188
break;
1189
case 131: /* --delay */
1190
errno = 0;
1191
delay = strtof(arg, &tmp);
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
1193
fprintf(stderr, "Bad delay\n");
1194
exit(EXIT_FAILURE);
1195
}
1196
break;
1197
case ARGP_KEY_ARG:
1198
argp_usage(state);
1199
case ARGP_KEY_END:
1200
break;
1201
default:
1202
return ARGP_ERR_UNKNOWN;
1203
}
1204
return 0;
1205
}
1206
1207
struct argp argp = { .options = options, .parser = parse_opt,
1208
.args_doc = "",
1209
.doc = "Mandos client -- Get and decrypt"
1210
" passwords from a Mandos server" };
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1215
goto end;
1216
}
1217
}
1218
1219
if(not debug){
1220
avahi_set_log_function(empty_log);
1221
}
1222
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1226
alphasort);
1227
if(ret >= 1){
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1230
if(debug){
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1232
}
1233
if(interface == NULL){
1234
perror("malloc");
1235
free(direntries);
1236
exitcode = EXIT_FAILURE;
1237
goto end;
1238
}
1239
free(direntries);
1240
} else {
1241
free(direntries);
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1244
goto end;
1245
}
1246
}
1247
1248
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
from the signal handler */
1250
/* Initialize the pseudo-RNG for Avahi */
1251
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
sigemptyset(&sigterm_action.sa_mask);
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1261
if(ret == -1){
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1264
goto end;
1265
}
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1267
if(ret == -1){
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1270
goto end;
1271
}
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1273
if(ret == -1){
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1276
goto end;
1277
}
1278
/* Need to check if the handler is SIG_IGN before handling:
1279
| [[info:libc:Initial Signal Actions]] |
1280
| [[info:libc:Basic Signal Handling]] |
1281
*/
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1283
if(ret == -1){
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1286
}
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1289
if(ret == -1){
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1292
goto end;
1293
}
1294
}
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1296
if(ret == -1){
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1299
}
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1302
if(ret == -1){
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1305
goto end;
1306
}
1307
}
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1309
if(ret == -1){
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1312
}
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1315
if(ret == -1){
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
}
1321
1322
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
995
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
1325
if(if_index == 0){
997
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
exit(EXIT_FAILURE);
999
}
1000
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
port = (uint16_t)tmpmax;
1019
*address = '\0';
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1022
if(ret < 0){
1023
exitcode = EXIT_FAILURE;
1024
} else {
1025
exitcode = EXIT_SUCCESS;
1026
}
1027
goto end;
1028
}
1029
1030
if(not debug){
1031
avahi_set_log_function(empty_log);
1032
}
1033
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1036
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
" object.\n");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
1046
{
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1054
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1058
NULL, &error);
1059
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1062
}
1063
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1074
AVAHI_PROTO_INET6,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1077
if(sb == NULL) {
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1081
goto end;
1082
}
1083
1084
/* Run the main loop */
1085
1086
if(debug){
1087
fprintf(stderr, "Starting Avahi loop search\n");
1088
}
1089
1090
avahi_simple_poll_loop(mc.simple_poll);
1091
1327
exitcode = EXIT_FAILURE;
1328
goto end;
1329
}
1330
1331
if(quit_now){
1332
goto end;
1333
}
1334
1335
/* Re-raise priviliges */
1336
errno = 0;
1337
ret = seteuid(0);
1338
if(ret == -1){
1339
perror("seteuid");
1340
}
1341
1342
#ifdef __linux__
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
messages to mess up the prompt */
1345
ret = klogctl(8, NULL, 5);
1346
bool restore_loglevel = true;
1347
if(ret == -1){
1348
restore_loglevel = false;
1349
perror("klogctl");
1350
}
1351
#endif /* __linux__ */
1352
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1354
if(sd < 0){
1355
perror("socket");
1356
exitcode = EXIT_FAILURE;
1357
#ifdef __linux__
1358
if(restore_loglevel){
1359
ret = klogctl(7, NULL, 0);
1360
if(ret == -1){
1361
perror("klogctl");
1362
}
1363
}
1364
#endif /* __linux__ */
1365
/* Lower privileges */
1366
errno = 0;
1367
ret = seteuid(uid);
1368
if(ret == -1){
1369
perror("seteuid");
1370
}
1371
goto end;
1372
}
1373
strcpy(network.ifr_name, interface);
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
if(ret == -1){
1376
perror("ioctl SIOCGIFFLAGS");
1377
#ifdef __linux__
1378
if(restore_loglevel){
1379
ret = klogctl(7, NULL, 0);
1380
if(ret == -1){
1381
perror("klogctl");
1382
}
1383
}
1384
#endif /* __linux__ */
1385
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1387
errno = 0;
1388
ret = seteuid(uid);
1389
if(ret == -1){
1390
perror("seteuid");
1391
}
1392
goto end;
1393
}
1394
if((network.ifr_flags & IFF_UP) == 0){
1395
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1398
if(ret == -1){
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1402
#ifdef __linux__
1403
if(restore_loglevel){
1404
ret = klogctl(7, NULL, 0);
1405
if(ret == -1){
1406
perror("klogctl");
1407
}
1408
}
1409
#endif /* __linux__ */
1410
/* Lower privileges */
1411
errno = 0;
1412
ret = seteuid(uid);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
goto end;
1417
}
1418
}
1419
/* sleep checking until interface is running */
1420
for(int i=0; i < delay * 4; i++){
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1422
if(ret == -1){
1423
perror("ioctl SIOCGIFFLAGS");
1424
} else if(network.ifr_flags & IFF_RUNNING){
1425
break;
1426
}
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1428
ret = nanosleep(&sleeptime, NULL);
1429
if(ret == -1 and errno != EINTR){
1430
perror("nanosleep");
1431
}
1432
}
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1436
if(ret == -1){
1437
perror("close");
1438
}
1439
}
1440
#ifdef __linux__
1441
if(restore_loglevel){
1442
/* Restores kernel loglevel to default */
1443
ret = klogctl(7, NULL, 0);
1444
if(ret == -1){
1445
perror("klogctl");
1446
}
1447
}
1448
#endif /* __linux__ */
1449
/* Lower privileges */
1450
errno = 0;
1451
if(take_down_interface){
1452
/* Lower privileges */
1453
ret = seteuid(uid);
1454
if(ret == -1){
1455
perror("seteuid");
1456
}
1457
} else {
1458
/* Lower privileges permanently */
1459
ret = setuid(uid);
1460
if(ret == -1){
1461
perror("setuid");
1462
}
1463
}
1464
}
1465
1466
if(quit_now){
1467
goto end;
1468
}
1469
1470
ret = init_gnutls_global(pubkey, seckey);
1471
if(ret == -1){
1472
fprintf(stderr, "init_gnutls_global failed\n");
1473
exitcode = EXIT_FAILURE;
1474
goto end;
1475
} else {
1476
gnutls_initialized = true;
1477
}
1478
1479
if(quit_now){
1480
goto end;
1481
}
1482
1483
tempdir_created = true;
1484
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1486
perror("mkdtemp");
1487
goto end;
1488
}
1489
1490
if(quit_now){
1491
goto end;
1492
}
1493
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
fprintf(stderr, "init_gpgme failed\n");
1496
exitcode = EXIT_FAILURE;
1497
goto end;
1498
} else {
1499
gpgme_initialized = true;
1500
}
1501
1502
if(quit_now){
1503
goto end;
1504
}
1505
1506
if(connect_to != NULL){
1507
/* Connect directly, do not use Zeroconf */
1508
/* (Mainly meant for debugging) */
1509
char *address = strrchr(connect_to, ':');
1510
if(address == NULL){
1511
fprintf(stderr, "No colon in address\n");
1512
exitcode = EXIT_FAILURE;
1513
goto end;
1514
}
1515
1516
if(quit_now){
1517
goto end;
1518
}
1519
1520
uint16_t port;
1521
errno = 0;
1522
tmpmax = strtoimax(address+1, &tmp, 10);
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1525
fprintf(stderr, "Bad port number\n");
1526
exitcode = EXIT_FAILURE;
1527
goto end;
1528
}
1529
1530
if(quit_now){
1531
goto end;
1532
}
1533
1534
port = (uint16_t)tmpmax;
1535
*address = '\0';
1536
address = connect_to;
1537
/* Colon in address indicates IPv6 */
1538
int af;
1539
if(strchr(address, ':') != NULL){
1540
af = AF_INET6;
1541
} else {
1542
af = AF_INET;
1543
}
1544
1545
if(quit_now){
1546
goto end;
1547
}
1548
1549
ret = start_mandos_communication(address, port, if_index, af);
1550
if(ret < 0){
1551
exitcode = EXIT_FAILURE;
1552
} else {
1553
exitcode = EXIT_SUCCESS;
1554
}
1555
goto end;
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
{
1563
AvahiServerConfig config;
1564
/* Do not publish any local Zeroconf records */
1565
avahi_server_config_init(&config);
1566
config.publish_hinfo = 0;
1567
config.publish_addresses = 0;
1568
config.publish_workstation = 0;
1569
config.publish_domain = 0;
1570
1571
/* Allocate a new server */
1572
mc.server = avahi_server_new(avahi_simple_poll_get
1573
(mc.simple_poll), &config, NULL,
1574
NULL, &error);
1575
1576
/* Free the Avahi configuration data */
1577
avahi_server_config_free(&config);
1578
}
1579
1580
/* Check if creating the Avahi server object succeeded */
1581
if(mc.server == NULL){
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1583
avahi_strerror(error));
1584
exitcode = EXIT_FAILURE;
1585
goto end;
1586
}
1587
1588
if(quit_now){
1589
goto end;
1590
}
1591
1592
/* Create the Avahi service browser */
1593
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1595
NULL, 0, browse_callback, NULL);
1596
if(sb == NULL){
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1598
avahi_strerror(avahi_server_errno(mc.server)));
1599
exitcode = EXIT_FAILURE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1607
/* Run the main loop */
1608
1609
if(debug){
1610
fprintf(stderr, "Starting Avahi loop search\n");
1611
}
1612
1613
avahi_simple_poll_loop(mc.simple_poll);
1614
1092
1615
end:
1093
1094
if(debug){
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1096
}
1097
1098
/* Cleanup things */
1099
if(sb != NULL)
1100
avahi_s_service_browser_free(sb);
1101
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1157
return exitcode;
1616
1617
if(debug){
1618
fprintf(stderr, "%s exiting\n", argv[0]);
1619
}
1620
1621
/* Cleanup things */
1622
if(sb != NULL)
1623
avahi_s_service_browser_free(sb);
1624
1625
if(mc.server != NULL)
1626
avahi_server_free(mc.server);
1627
1628
if(mc.simple_poll != NULL)
1629
avahi_simple_poll_free(mc.simple_poll);
1630
1631
if(gnutls_initialized){
1632
gnutls_certificate_free_credentials(mc.cred);
1633
gnutls_global_deinit();
1634
gnutls_dh_params_deinit(mc.dh_params);
1635
}
1636
1637
if(gpgme_initialized){
1638
gpgme_release(mc.ctx);
1639
}
1640
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1644
errno = 0;
1645
ret = seteuid(0);
1646
if(ret == -1){
1647
perror("seteuid");
1648
}
1649
if(geteuid() == 0){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1656
if(ret == -1){
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1658
}
1659
}
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror("close");
1663
}
1664
/* Lower privileges permanently */
1665
errno = 0;
1666
ret = setuid(uid);
1667
if(ret == -1){
1668
perror("setuid");
1669
}
1670
}
1671
}
1672
1673
/* Removes the temp directory used by GPGME */
1674
if(tempdir_created){
1675
DIR *d;
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1678
if(d == NULL){
1679
if(errno != ENOENT){
1680
perror("opendir");
1681
}
1682
} else {
1683
while(true){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1686
break;
1687
}
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1693
continue;
1694
}
1695
char *fullname = NULL;
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
1697
direntry->d_name);
1698
if(ret < 0){
1699
perror("asprintf");
1700
continue;
1701
}
1702
ret = remove(fullname);
1703
if(ret == -1){
1704
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1705
strerror(errno));
1706
}
1707
free(fullname);
1708
}
1709
closedir(d);
1710
}
1711
ret = rmdir(tempdir);
1712
if(ret == -1 and errno != ENOENT){
1713
perror("rmdir");
1714
}
1715
}
1716
1717
if(quit_now){
1718
sigemptyset(&old_sigterm_action.sa_mask);
1719
old_sigterm_action.sa_handler = SIG_DFL;
1720
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1721
&old_sigterm_action,
1722
NULL));
1723
if(ret == -1){
1724
perror("sigaction");
1725
}
1726
do {
1727
ret = raise(signal_received);
1728
} while(ret != 0 and errno == EINTR);
1729
if(ret != 0){
1730
perror("raise");
1731
abort();
1732
}
1733
TEMP_FAILURE_RETRY(pause());
1734
}
1735
1736
return exitcode;
1158
1737
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0