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237.2.131
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-10 17:21:36 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090910172136-plhvv6jjz8bjrhz4
* plugins.d/mandos-client.c (init_gnutls_session): Retry interrupted
GnuTLS functions.
(main): Drop privileges early, and raise them only where needed and
lower them whenever possible.
GnuTLS functions.
(main): Drop privileges early, and raise them only where needed and
lower them whenever possible.
- files added:
- debian/watch
- files renamed:
- mandos-list => mandos-ctl
- 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() */
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, SCNu16 */
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(),
74
getuid(), getgid(), seteuid(),
70
75
setgid() */
71
76
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
77
#include <iso646.h> /* not, or, and */
73
78
#include <argp.h> /* struct argp_option, error_t, struct
74
79
argp_state, struct argp,
75
80
argp_parse(), ARGP_KEY_ARG,
76
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
77
89
78
90
/* Avahi */
79
91
/* All Avahi types, constants and functions
125
137
gpgme_ctx_t ctx;
126
138
} mandos_context;
127
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
128
145
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
131
148
* "buffer_length" is how much is already used.
132
149
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
134
151
size_t buffer_capacity){
135
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
162
/*
146
163
* Initialize GPGME.
147
164
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
149
166
const char *pubkey, const char *tempdir){
150
int ret;
151
167
gpgme_error_t rc;
152
168
gpgme_engine_info_t engine_info;
153
169
154
170
155
171
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
172
* Helper function to insert pub and seckey to the engine keyring.
157
173
*/
158
174
bool import_key(const char *filename){
175
int ret;
159
176
int fd;
160
177
gpgme_data_t pgp_data;
161
178
172
189
return false;
173
190
}
174
191
175
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
176
193
if(rc != GPG_ERR_NO_ERROR){
177
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
195
gpgme_strsource(rc), gpgme_strerror(rc));
188
205
}
189
206
190
207
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
208
fprintf(stderr, "Initializing GPGME\n");
192
209
}
193
210
194
211
/* Init GPGME */
221
238
}
222
239
223
240
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
241
rc = gpgme_new(&(mc.ctx));
225
242
if(rc != GPG_ERR_NO_ERROR){
226
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
244
gpgme_strsource(rc), gpgme_strerror(rc));
232
249
return false;
233
250
}
234
251
235
return true;
252
return true;
236
253
}
237
254
238
255
/*
239
256
* Decrypt OpenPGP data.
240
257
* Returns -1 on error
241
258
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
260
size_t crypto_size,
245
261
char **plaintext){
246
262
gpgme_data_t dh_crypto, dh_plain;
273
289
274
290
/* Decrypt data from the cryptotext data buffer to the plaintext
275
291
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
277
293
if(rc != GPG_ERR_NO_ERROR){
278
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
295
gpgme_strsource(rc), gpgme_strerror(rc));
280
296
plaintext_length = -1;
281
297
if(debug){
282
298
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
284
300
if(result == NULL){
285
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
302
} else {
293
309
}
294
310
gpgme_recipient_t recipient;
295
311
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
}
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
306
320
}
307
321
}
308
322
}
322
336
323
337
*plaintext = NULL;
324
338
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
326
340
(size_t)plaintext_length,
327
341
plaintext_capacity);
328
342
if(plaintext_capacity == 0){
329
perror("adjustbuffer");
343
perror("incbuffer");
330
344
plaintext_length = -1;
331
345
goto decrypt_end;
332
346
}
364
378
return plaintext_length;
365
379
}
366
380
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning */
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
369
384
if(ret == NULL)
370
385
ret = "(unknown)";
371
386
return ret;
377
392
fprintf(stderr, "GnuTLS: %s", string);
378
393
}
379
394
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
382
396
const char *seckeyfilename){
383
397
int ret;
384
398
387
401
}
388
402
389
403
ret = gnutls_global_init();
390
if(ret != GNUTLS_E_SUCCESS) {
404
if(ret != GNUTLS_E_SUCCESS){
391
405
fprintf(stderr, "GnuTLS global_init: %s\n",
392
406
safer_gnutls_strerror(ret));
393
407
return -1;
402
416
}
403
417
404
418
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
406
420
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
409
425
safer_gnutls_strerror(ret));
410
426
gnutls_global_deinit();
411
427
return -1;
418
434
}
419
435
420
436
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
422
438
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
424
440
fprintf(stderr,
425
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
446
}
431
447
432
448
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if(ret != GNUTLS_E_SUCCESS) {
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
435
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
452
" %s\n", safer_gnutls_strerror(ret));
437
453
goto globalfail;
438
454
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if(ret != GNUTLS_E_SUCCESS) {
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
441
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
458
safer_gnutls_strerror(ret));
443
459
goto globalfail;
444
460
}
445
461
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
463
448
464
return 0;
449
465
450
466
globalfail:
451
467
452
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
453
469
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
455
471
return -1;
456
472
}
457
473
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
460
475
int ret;
461
476
/* GnuTLS session creation */
462
ret = gnutls_init(session, GNUTLS_SERVER);
477
do {
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
463
480
if(ret != GNUTLS_E_SUCCESS){
464
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
482
safer_gnutls_strerror(ret));
467
484
468
485
{
469
486
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if(ret != GNUTLS_E_SUCCESS) {
487
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
472
491
fprintf(stderr, "Syntax error at: %s\n", err);
473
492
fprintf(stderr, "GnuTLS error: %s\n",
474
493
safer_gnutls_strerror(ret));
477
496
}
478
497
}
479
498
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if(ret != GNUTLS_E_SUCCESS) {
499
do {
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
if(ret != GNUTLS_E_SUCCESS){
483
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
505
safer_gnutls_strerror(ret));
485
506
gnutls_deinit(*session);
487
508
}
488
509
489
510
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request(*session,
491
GNUTLS_CERT_IGNORE);
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
512
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
494
514
495
515
return 0;
496
516
}
499
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
500
520
__attribute__((unused)) const char *txt){}
501
521
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
502
525
/* Called when a Mandos server is found */
503
526
static int start_mandos_communication(const char *ip, uint16_t port,
504
527
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
528
int af){
529
int ret, tcp_sd = -1;
507
530
ssize_t sret;
508
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
509
535
char *buffer = NULL;
510
536
char *decrypted_buffer;
511
537
size_t buffer_length = 0;
512
538
size_t buffer_capacity = 0;
513
ssize_t decrypted_buffer_size;
514
539
size_t written;
515
540
int retval = 0;
516
char interface[IF_NAMESIZE];
517
541
gnutls_session_t session;
518
519
ret = init_gnutls_session(mc, &session);
542
int pf; /* Protocol family */
543
544
if(quit_now){
545
return -1;
546
}
547
548
switch(af){
549
case AF_INET6:
550
pf = PF_INET6;
551
break;
552
case AF_INET:
553
pf = PF_INET;
554
break;
555
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
557
return -1;
558
}
559
560
ret = init_gnutls_session(&session);
520
561
if(ret != 0){
521
562
return -1;
522
563
}
523
564
524
565
if(debug){
525
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
526
567
"\n", ip, port);
527
568
}
528
569
529
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
530
if(tcp_sd < 0) {
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
if(tcp_sd < 0){
531
572
perror("socket");
532
return -1;
573
retval = -1;
574
goto mandos_end;
533
575
}
534
576
535
if(debug){
536
if(if_indextoname((unsigned int)if_index, interface) == NULL){
537
perror("if_indextoname");
538
return -1;
539
}
540
fprintf(stderr, "Binding to interface %s\n", interface);
577
if(quit_now){
578
goto mandos_end;
541
579
}
542
580
543
581
memset(&to, 0, sizeof(to));
544
to.in6.sin6_family = AF_INET6;
545
/* It would be nice to have a way to detect if we were passed an
546
IPv4 address here. Now we assume an IPv6 address. */
547
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
582
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
585
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
588
}
548
589
if(ret < 0 ){
549
590
perror("inet_pton");
550
return -1;
591
retval = -1;
592
goto mandos_end;
551
593
}
552
594
if(ret == 0){
553
595
fprintf(stderr, "Bad address: %s\n", ip);
554
return -1;
555
}
556
to.in6.sin6_port = htons(port); /* Spurious warning */
596
retval = -1;
597
goto mandos_end;
598
}
599
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
611
goto mandos_end;
612
}
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
615
}
616
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
620
}
557
621
558
to.in6.sin6_scope_id = (uint32_t)if_index;
622
if(quit_now){
623
goto mandos_end;
624
}
559
625
560
626
if(debug){
561
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
562
port);
563
char addrstr[INET6_ADDRSTRLEN] = "";
564
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
565
sizeof(addrstr)) == NULL){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
631
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
634
}
635
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
638
}
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
566
650
perror("inet_ntop");
567
651
} else {
568
652
if(strcmp(addrstr, ip) != 0){
571
655
}
572
656
}
573
657
574
ret = connect(tcp_sd, &to.in, sizeof(to));
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
575
667
if(ret < 0){
576
668
perror("connect");
577
return -1;
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
578
675
}
579
676
580
677
const char *out = mandos_protocol_version;
599
696
break;
600
697
}
601
698
}
699
700
if(quit_now){
701
goto mandos_end;
702
}
602
703
}
603
704
604
705
if(debug){
605
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
606
707
}
607
708
709
if(quit_now){
710
goto mandos_end;
711
}
712
608
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
609
714
610
do{
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
do {
611
720
ret = gnutls_handshake(session);
721
if(quit_now){
722
goto mandos_end;
723
}
612
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
613
725
614
726
if(ret != GNUTLS_E_SUCCESS){
623
735
/* Read OpenPGP packet that contains the wanted password */
624
736
625
737
if(debug){
626
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
627
739
ip);
628
740
}
629
741
630
742
while(true){
631
buffer_capacity = adjustbuffer(&buffer, buffer_length,
743
744
if(quit_now){
745
goto mandos_end;
746
}
747
748
buffer_capacity = incbuffer(&buffer, buffer_length,
632
749
buffer_capacity);
633
750
if(buffer_capacity == 0){
634
perror("adjustbuffer");
751
perror("incbuffer");
635
752
retval = -1;
636
753
goto mandos_end;
637
754
}
638
755
756
if(quit_now){
757
goto mandos_end;
758
}
759
639
760
sret = gnutls_record_recv(session, buffer+buffer_length,
640
761
BUFFER_SIZE);
641
762
if(sret == 0){
647
768
case GNUTLS_E_AGAIN:
648
769
break;
649
770
case GNUTLS_E_REHANDSHAKE:
650
do{
771
do {
651
772
ret = gnutls_handshake(session);
773
774
if(quit_now){
775
goto mandos_end;
776
}
652
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
653
778
if(ret < 0){
654
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
673
798
fprintf(stderr, "Closing TLS session\n");
674
799
}
675
800
801
if(quit_now){
802
goto mandos_end;
803
}
804
676
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
677
806
807
if(quit_now){
808
goto mandos_end;
809
}
810
678
811
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
812
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
680
814
buffer_length,
681
815
&decrypted_buffer);
682
816
if(decrypted_buffer_size >= 0){
817
683
818
written = 0;
684
819
while(written < (size_t) decrypted_buffer_size){
820
if(quit_now){
821
goto mandos_end;
822
}
823
685
824
ret = (int)fwrite(decrypted_buffer + written, 1,
686
825
(size_t)decrypted_buffer_size - written,
687
826
stdout);
707
846
708
847
mandos_end:
709
848
free(buffer);
710
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
711
852
if(ret == -1){
712
853
perror("close");
713
854
}
714
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
715
859
return retval;
716
860
}
717
861
718
862
static void resolve_callback(AvahiSServiceResolver *r,
719
863
AvahiIfIndex interface,
720
AVAHI_GCC_UNUSED AvahiProtocol protocol,
864
AvahiProtocol proto,
721
865
AvahiResolverEvent event,
722
866
const char *name,
723
867
const char *type,
728
872
AVAHI_GCC_UNUSED AvahiStringList *txt,
729
873
AVAHI_GCC_UNUSED AvahiLookupResultFlags
730
874
flags,
731
void* userdata) {
732
mandos_context *mc = userdata;
875
AVAHI_GCC_UNUSED void* userdata){
733
876
assert(r);
734
877
735
878
/* Called whenever a service has been resolved successfully or
736
879
timed out */
737
880
738
switch(event) {
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
739
886
default:
740
887
case AVAHI_RESOLVER_FAILURE:
741
888
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
742
889
" of type '%s' in domain '%s': %s\n", name, type, domain,
743
avahi_strerror(avahi_server_errno(mc->server)));
890
avahi_strerror(avahi_server_errno(mc.server)));
744
891
break;
745
892
746
893
case AVAHI_RESOLVER_FOUND:
749
896
avahi_address_snprint(ip, sizeof(ip), address);
750
897
if(debug){
751
898
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
752
PRIu16 ") on port %d\n", name, host_name, ip,
753
interface, port);
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
754
901
}
755
int ret = start_mandos_communication(ip, port, interface, mc);
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
756
904
if(ret == 0){
757
avahi_simple_poll_quit(mc->simple_poll);
905
avahi_simple_poll_quit(mc.simple_poll);
758
906
}
759
907
}
760
908
}
761
909
avahi_s_service_resolver_free(r);
762
910
}
763
911
764
static void browse_callback( AvahiSServiceBrowser *b,
765
AvahiIfIndex interface,
766
AvahiProtocol protocol,
767
AvahiBrowserEvent event,
768
const char *name,
769
const char *type,
770
const char *domain,
771
AVAHI_GCC_UNUSED AvahiLookupResultFlags
772
flags,
773
void* userdata) {
774
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){
775
922
assert(b);
776
923
777
924
/* Called whenever a new services becomes available on the LAN or
778
925
is removed from the LAN */
779
926
780
switch(event) {
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
781
932
default:
782
933
case AVAHI_BROWSER_FAILURE:
783
934
784
935
fprintf(stderr, "(Avahi browser) %s\n",
785
avahi_strerror(avahi_server_errno(mc->server)));
786
avahi_simple_poll_quit(mc->simple_poll);
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
787
938
return;
788
939
789
940
case AVAHI_BROWSER_NEW:
792
943
the callback function is called the Avahi server will free the
793
944
resolver for us. */
794
945
795
if(!(avahi_s_service_resolver_new(mc->server, interface,
796
protocol, name, type, domain,
797
AVAHI_PROTO_INET6, 0,
798
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)
799
949
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
800
name, avahi_strerror(avahi_server_errno(mc->server)));
950
name, avahi_strerror(avahi_server_errno(mc.server)));
801
951
break;
802
952
803
953
case AVAHI_BROWSER_REMOVE:
812
962
}
813
963
}
814
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
815
979
int main(int argc, char *argv[]){
816
AvahiSServiceBrowser *sb = NULL;
817
int error;
818
int ret;
819
int exitcode = EXIT_SUCCESS;
820
const char *interface = "eth0";
821
struct ifreq network;
822
int sd;
823
uid_t uid;
824
gid_t gid;
825
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
827
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
830
831
mandos_context mc = { .simple_poll = NULL, .server = NULL,
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
834
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
836
837
{
838
struct argp_option options[] = {
839
{ .name = "debug", .key = 128,
840
.doc = "Debug mode", .group = 3 },
841
{ .name = "connect", .key = 'c',
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
844
.group = 1 },
845
{ .name = "interface", .key = 'i',
846
.arg = "NAME",
847
.doc = "Interface that will be used to search for Mandos"
848
" servers",
849
.group = 1 },
850
{ .name = "seckey", .key = 's',
851
.arg = "FILE",
852
.doc = "OpenPGP secret key file base name",
853
.group = 1 },
854
{ .name = "pubkey", .key = 'p',
855
.arg = "FILE",
856
.doc = "OpenPGP public key file base name",
857
.group = 2 },
858
{ .name = "dh-bits", .key = 129,
859
.arg = "BITS",
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
862
.group = 2 },
863
{ .name = "priority", .key = 130,
864
.arg = "STRING",
865
.doc = "GnuTLS priority string for the TLS handshake",
866
.group = 1 },
867
{ .name = NULL }
868
};
869
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
872
switch(key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
ret = sscanf(arg, "%u", &mc.dh_bits);
890
if(ret != 1){
891
fprintf(stderr, "Bad number of DH bits\n");
892
exit(EXIT_FAILURE);
893
}
894
break;
895
case 130: /* --priority */
896
mc.priority = arg;
897
break;
898
case ARGP_KEY_ARG:
899
argp_usage(state);
900
case ARGP_KEY_END:
901
break;
902
default:
903
return ARGP_ERR_UNKNOWN;
904
}
905
return 0;
906
}
907
908
struct argp argp = { .options = options, .parser = parse_opt,
909
.args_doc = "",
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
920
/* If the interface is down, bring it up */
921
{
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
if(sd < 0) {
924
perror("socket");
925
exitcode = EXIT_FAILURE;
926
goto end;
927
}
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
930
if(ret == -1){
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
933
goto end;
934
}
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
938
if(ret == -1){
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
941
goto end;
942
}
943
}
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
948
}
949
950
uid = getuid();
951
gid = getgid();
952
953
ret = setuid(uid);
954
if(ret == -1){
955
perror("setuid");
956
}
957
958
setgid(gid);
959
if(ret == -1){
960
perror("setgid");
961
}
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if(ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
980
AvahiSServiceBrowser *sb = NULL;
981
int error;
982
int ret;
983
intmax_t tmpmax;
984
char *tmp;
985
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
const char *seckey = PATHDIR "/" SECKEY;
997
const char *pubkey = PATHDIR "/" PUBKEY;
998
999
bool gnutls_initialized = false;
1000
bool gpgme_initialized = false;
1001
float delay = 2.5f;
1002
1003
struct sigaction old_sigterm_action;
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1006
uid = getuid();
1007
gid = getgid();
1008
1009
/* Lower any group privileges we might have, just to be safe */
1010
errno = 0;
1011
ret = setgid(gid);
1012
if(ret == -1){
1013
perror("setgid");
1014
}
1015
1016
/* Lower user privileges (temporarily) */
1017
errno = 0;
1018
ret = seteuid(uid);
1019
if(ret == -1){
1020
perror("seteuid");
1021
}
1022
1023
if(quit_now){
1024
goto end;
1025
}
1026
1027
{
1028
struct argp_option options[] = {
1029
{ .name = "debug", .key = 128,
1030
.doc = "Debug mode", .group = 3 },
1031
{ .name = "connect", .key = 'c',
1032
.arg = "ADDRESS:PORT",
1033
.doc = "Connect directly to a specific Mandos server",
1034
.group = 1 },
1035
{ .name = "interface", .key = 'i',
1036
.arg = "NAME",
1037
.doc = "Network interface that will be used to search for"
1038
" Mandos servers",
1039
.group = 1 },
1040
{ .name = "seckey", .key = 's',
1041
.arg = "FILE",
1042
.doc = "OpenPGP secret key file base name",
1043
.group = 1 },
1044
{ .name = "pubkey", .key = 'p',
1045
.arg = "FILE",
1046
.doc = "OpenPGP public key file base name",
1047
.group = 2 },
1048
{ .name = "dh-bits", .key = 129,
1049
.arg = "BITS",
1050
.doc = "Bit length of the prime number used in the"
1051
" Diffie-Hellman key exchange",
1052
.group = 2 },
1053
{ .name = "priority", .key = 130,
1054
.arg = "STRING",
1055
.doc = "GnuTLS priority string for the TLS handshake",
1056
.group = 1 },
1057
{ .name = "delay", .key = 131,
1058
.arg = "SECONDS",
1059
.doc = "Maximum delay to wait for interface startup",
1060
.group = 2 },
1061
{ .name = NULL }
1062
};
1063
1064
error_t parse_opt(int key, char *arg,
1065
struct argp_state *state){
1066
switch(key){
1067
case 128: /* --debug */
1068
debug = true;
1069
break;
1070
case 'c': /* --connect */
1071
connect_to = arg;
1072
break;
1073
case 'i': /* --interface */
1074
interface = arg;
1075
break;
1076
case 's': /* --seckey */
1077
seckey = arg;
1078
break;
1079
case 'p': /* --pubkey */
1080
pubkey = arg;
1081
break;
1082
case 129: /* --dh-bits */
1083
errno = 0;
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1089
}
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
break;
1092
case 130: /* --priority */
1093
mc.priority = arg;
1094
break;
1095
case 131: /* --delay */
1096
errno = 0;
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1106
break;
1107
default:
1108
return ARGP_ERR_UNKNOWN;
1109
}
1110
return 0;
1111
}
1112
1113
struct argp argp = { .options = options, .parser = parse_opt,
1114
.args_doc = "",
1115
.doc = "Mandos client -- Get and decrypt"
1116
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
1123
}
1124
1125
if(not debug){
1126
avahi_set_log_function(empty_log);
1127
}
1128
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1137
goto end;
1138
}
1139
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1151
goto end;
1152
}
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1157
goto end;
1158
}
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1162
*/
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1180
}
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
986
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
1206
if(if_index == 0){
988
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
989
exit(EXIT_FAILURE);
990
}
991
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
996
if(address == NULL){
997
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
1000
}
1001
uint16_t port;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1003
if(ret != 1){
1004
fprintf(stderr, "Bad port number\n");
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
*address = '\0';
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1011
if(ret < 0){
1012
exitcode = EXIT_FAILURE;
1013
} else {
1014
exitcode = EXIT_SUCCESS;
1015
}
1016
goto end;
1017
}
1018
1019
if(not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1025
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1030
" object.\n");
1031
exitcode = EXIT_FAILURE;
1032
goto end;
1033
}
1034
1035
{
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1043
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1047
NULL, &error);
1048
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1051
}
1052
1053
/* Check if creating the Avahi server object succeeded */
1054
if(mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
avahi_strerror(error));
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
1063
AVAHI_PROTO_INET6,
1064
"_mandos._tcp", NULL, 0,
1065
browse_callback, &mc);
1066
if(sb == NULL) {
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
1070
goto end;
1071
}
1072
1073
/* Run the main loop */
1074
1075
if(debug){
1076
fprintf(stderr, "Starting Avahi loop search\n");
1077
}
1078
1079
avahi_simple_poll_loop(mc.simple_poll);
1080
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
1345
}
1346
1347
if(quit_now){
1348
goto end;
1349
}
1350
1351
ret = init_gnutls_global(pubkey, seckey);
1352
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
1355
goto end;
1356
} else {
1357
gnutls_initialized = true;
1358
}
1359
1360
if(quit_now){
1361
goto end;
1362
}
1363
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
1371
if(quit_now){
1372
goto end;
1373
}
1374
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
1378
goto end;
1379
} else {
1380
gpgme_initialized = true;
1381
}
1382
1383
if(quit_now){
1384
goto end;
1385
}
1386
1387
if(connect_to != NULL){
1388
/* Connect directly, do not use Zeroconf */
1389
/* (Mainly meant for debugging) */
1390
char *address = strrchr(connect_to, ':');
1391
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
uint16_t port;
1402
errno = 0;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
1408
goto end;
1409
}
1410
1411
if(quit_now){
1412
goto end;
1413
}
1414
1415
port = (uint16_t)tmpmax;
1416
*address = '\0';
1417
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1419
int af;
1420
if(strchr(address, ':') != NULL){
1421
af = AF_INET6;
1422
} else {
1423
af = AF_INET;
1424
}
1425
1426
if(quit_now){
1427
goto end;
1428
}
1429
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
1434
exitcode = EXIT_SUCCESS;
1435
}
1436
goto end;
1437
}
1438
1439
if(quit_now){
1440
goto end;
1441
}
1442
1443
{
1444
AvahiServerConfig config;
1445
/* Do not publish any local Zeroconf records */
1446
avahi_server_config_init(&config);
1447
config.publish_hinfo = 0;
1448
config.publish_addresses = 0;
1449
config.publish_workstation = 0;
1450
config.publish_domain = 0;
1451
1452
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
1456
1457
/* Free the Avahi configuration data */
1458
avahi_server_config_free(&config);
1459
}
1460
1461
/* Check if creating the Avahi server object succeeded */
1462
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
1469
if(quit_now){
1470
goto end;
1471
}
1472
1473
/* Create the Avahi service browser */
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1477
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
1481
goto end;
1482
}
1483
1484
if(quit_now){
1485
goto end;
1486
}
1487
1488
/* Run the main loop */
1489
1490
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
1495
1081
1496
end:
1082
1083
if(debug){
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1085
}
1086
1087
/* Cleanup things */
1088
if(sb != NULL)
1089
avahi_s_service_browser_free(sb);
1090
1091
if(mc.server != NULL)
1092
avahi_server_free(mc.server);
1093
1094
if(mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1096
1097
if(gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
if(errno != ENOENT){
1114
perror("opendir");
1115
}
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if(direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1 and errno != ENOENT){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
1497
1498
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
1500
}
1501
1502
/* Cleanup things */
1503
if(sb != NULL)
1504
avahi_s_service_browser_free(sb);
1505
1506
if(mc.server != NULL)
1507
avahi_server_free(mc.server);
1508
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
1511
1512
if(gnutls_initialized){
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
1515
gnutls_dh_params_deinit(mc.dh_params);
1516
}
1517
1518
if(gpgme_initialized){
1519
gpgme_release(mc.ctx);
1520
}
1521
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
1596
}
1597
1598
if(quit_now){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
1606
}
1607
1608
return exitcode;
1147
1609
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0