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24.1.124
(compared to revision 237.7.28)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2009-01-17 12:12:26 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: belorn@braxen-20090117121226-vphf231hvqq6zcgg
Added lower kernel loglevel to reduce clutter on system console.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
56
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
55
struct in6_addr, inet_pton(),
56
connect() */
59
57
#include <fcntl.h> /* open() */
60
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
59
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
61
#include <assert.h> /* assert() */
65
62
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <time.h> /* time(), nanosleep() */
67
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
65
SIOCSIFFLAGS, if_indextoname(),
69
66
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
67
#include <netinet/in.h>
73
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
69
getuid(), getgid(), setuid(),
70
setgid() */
76
71
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
72
#include <iso646.h> /* not, and, or */
78
73
#include <argp.h> /* struct argp_option, error_t, struct
79
74
argp_state, struct argp,
80
75
argp_parse(), ARGP_KEY_ARG,
81
76
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
77
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
91
78
92
79
/* Avahi */
93
80
/* All Avahi types, constants and functions
127
114
static const char mandos_protocol_version[] = "1";
128
115
const char *argp_program_version = "mandos-client " VERSION;
129
116
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
117
133
118
/* Used for passing in values through the Avahi callback functions */
134
119
typedef struct {
141
126
gpgme_ctx_t ctx;
142
127
} mandos_context;
143
128
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
152
129
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
130
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
131
* "buffer_capacity" is how much is currently allocated,
155
132
* "buffer_length" is how much is already used.
156
133
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
135
size_t buffer_capacity){
159
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
137
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
169
146
/*
170
147
* Initialize GPGME.
171
148
*/
172
static bool init_gpgme(const char *seckey,
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
173
150
const char *pubkey, const char *tempdir){
151
int ret;
174
152
gpgme_error_t rc;
175
153
gpgme_engine_info_t engine_info;
176
154
177
155
178
156
/*
179
* Helper function to insert pub and seckey to the engine keyring.
157
* Helper function to insert pub and seckey to the enigne keyring.
180
158
*/
181
159
bool import_key(const char *filename){
182
int ret;
183
160
int fd;
184
161
gpgme_data_t pgp_data;
185
162
196
173
return false;
197
174
}
198
175
199
rc = gpgme_op_import(mc.ctx, pgp_data);
176
rc = gpgme_op_import(mc->ctx, pgp_data);
200
177
if(rc != GPG_ERR_NO_ERROR){
201
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
179
gpgme_strsource(rc), gpgme_strerror(rc));
212
189
}
213
190
214
191
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
192
fprintf(stderr, "Initialize gpgme\n");
216
193
}
217
194
218
195
/* Init GPGME */
245
222
}
246
223
247
224
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
225
rc = gpgme_new(&(mc->ctx));
249
226
if(rc != GPG_ERR_NO_ERROR){
250
227
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
228
gpgme_strsource(rc), gpgme_strerror(rc));
256
233
return false;
257
234
}
258
235
259
return true;
236
return true;
260
237
}
261
238
262
239
/*
263
240
* Decrypt OpenPGP data.
264
241
* Returns -1 on error
265
242
*/
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
267
245
size_t crypto_size,
268
246
char **plaintext){
269
247
gpgme_data_t dh_crypto, dh_plain;
296
274
297
275
/* Decrypt data from the cryptotext data buffer to the plaintext
298
276
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
278
if(rc != GPG_ERR_NO_ERROR){
301
279
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
280
gpgme_strsource(rc), gpgme_strerror(rc));
303
281
plaintext_length = -1;
304
282
if(debug){
305
283
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
284
result = gpgme_op_decrypt_result(mc->ctx);
307
285
if(result == NULL){
308
286
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
309
287
} else {
316
294
}
317
295
gpgme_recipient_t recipient;
318
296
recipient = result->recipients;
319
while(recipient != NULL){
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
326
recipient = recipient->next;
297
if(recipient){
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
304
? "No" : "Yes");
305
recipient = recipient->next;
306
}
327
307
}
328
308
}
329
309
}
343
323
344
324
*plaintext = NULL;
345
325
while(true){
346
plaintext_capacity = incbuffer(plaintext,
326
plaintext_capacity = adjustbuffer(plaintext,
347
327
(size_t)plaintext_length,
348
328
plaintext_capacity);
349
329
if(plaintext_capacity == 0){
350
perror("incbuffer");
330
perror("adjustbuffer");
351
331
plaintext_length = -1;
352
332
goto decrypt_end;
353
333
}
385
365
return plaintext_length;
386
366
}
387
367
388
static const char * safer_gnutls_strerror(int value){
368
static const char * safer_gnutls_strerror(int value) {
389
369
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
370
-Wunreachable-code */
391
371
if(ret == NULL)
399
379
fprintf(stderr, "GnuTLS: %s", string);
400
380
}
401
381
402
static int init_gnutls_global(const char *pubkeyfilename,
382
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
403
384
const char *seckeyfilename){
404
385
int ret;
405
386
408
389
}
409
390
410
391
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
392
if(ret != GNUTLS_E_SUCCESS) {
412
393
fprintf(stderr, "GnuTLS global_init: %s\n",
413
394
safer_gnutls_strerror(ret));
414
395
return -1;
423
404
}
424
405
425
406
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
407
gnutls_certificate_allocate_credentials(&mc->cred);
427
408
if(ret != GNUTLS_E_SUCCESS){
428
409
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
410
* from
411
* -Wunreachable-code
412
*/
432
413
safer_gnutls_strerror(ret));
433
414
gnutls_global_deinit();
434
415
return -1;
441
422
}
442
423
443
424
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
425
(mc->cred, pubkeyfilename, seckeyfilename,
445
426
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
427
if(ret != GNUTLS_E_SUCCESS) {
447
428
fprintf(stderr,
448
429
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
453
434
}
454
435
455
436
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
437
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
458
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
440
" %s\n", safer_gnutls_strerror(ret));
460
441
goto globalfail;
461
442
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
464
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
446
safer_gnutls_strerror(ret));
466
447
goto globalfail;
467
448
}
468
449
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
451
471
452
return 0;
472
453
473
454
globalfail:
474
455
475
gnutls_certificate_free_credentials(mc.cred);
456
gnutls_certificate_free_credentials(mc->cred);
476
457
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
458
gnutls_dh_params_deinit(mc->dh_params);
478
459
return -1;
479
460
}
480
461
481
static int init_gnutls_session(gnutls_session_t *session){
462
static int init_gnutls_session(mandos_context *mc,
463
gnutls_session_t *session){
482
464
int ret;
483
465
/* GnuTLS session creation */
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
466
ret = gnutls_init(session, GNUTLS_SERVER);
490
467
if(ret != GNUTLS_E_SUCCESS){
491
468
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
469
safer_gnutls_strerror(ret));
494
471
495
472
{
496
473
const char *err;
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
505
476
fprintf(stderr, "Syntax error at: %s\n", err);
506
477
fprintf(stderr, "GnuTLS error: %s\n",
507
478
safer_gnutls_strerror(ret));
510
481
}
511
482
}
512
483
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
mc->cred);
486
if(ret != GNUTLS_E_SUCCESS) {
522
487
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
488
safer_gnutls_strerror(ret));
524
489
gnutls_deinit(*session);
526
491
}
527
492
528
493
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
530
496
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
498
533
499
return 0;
534
500
}
540
506
/* Called when a Mandos server is found */
541
507
static int start_mandos_communication(const char *ip, uint16_t port,
542
508
AvahiIfIndex if_index,
543
int af){
544
int ret, tcp_sd = -1;
509
mandos_context *mc){
510
int ret, tcp_sd;
545
511
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
550
513
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
514
char *decrypted_buffer;
552
515
size_t buffer_length = 0;
553
516
size_t buffer_capacity = 0;
517
ssize_t decrypted_buffer_size;
554
518
size_t written;
555
int retval = -1;
519
int retval = 0;
520
char interface[IF_NAMESIZE];
556
521
gnutls_session_t session;
557
int pf; /* Protocol family */
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
switch(af){
567
case AF_INET6:
568
pf = PF_INET6;
569
break;
570
case AF_INET:
571
pf = PF_INET;
572
break;
573
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
return -1;
577
}
578
579
ret = init_gnutls_session(&session);
522
523
ret = init_gnutls_session(mc, &session);
580
524
if(ret != 0){
581
525
return -1;
582
526
}
583
527
584
528
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
586
530
"\n", ip, port);
587
531
}
588
532
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
533
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
534
if(tcp_sd < 0) {
592
535
perror("socket");
593
errno = e;
594
goto mandos_end;
536
return -1;
595
537
}
596
538
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
539
if(debug){
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
perror("if_indextoname");
542
return -1;
543
}
544
fprintf(stderr, "Binding to interface %s\n", interface);
600
545
}
601
546
602
547
memset(&to, 0, sizeof(to));
603
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
609
}
548
to.in6.sin6_family = AF_INET6;
549
/* It would be nice to have a way to detect if we were passed an
550
IPv4 address here. Now we assume an IPv6 address. */
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
610
552
if(ret < 0 ){
611
int e = errno;
612
553
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
554
return -1;
615
555
}
616
556
if(ret == 0){
617
int e = errno;
618
557
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
558
return -1;
621
559
}
622
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
635
}
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
638
}
639
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
641
561
-Wconversion and
642
562
-Wunreachable-code */
643
}
644
563
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
564
to.in6.sin6_scope_id = (uint32_t)if_index;
649
565
650
566
if(debug){
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
655
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
658
}
659
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
662
}
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
567
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
568
port);
569
char addrstr[INET6_ADDRSTRLEN] = "";
570
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
571
sizeof(addrstr)) == NULL){
674
572
perror("inet_ntop");
675
573
} else {
676
574
if(strcmp(addrstr, ip) != 0){
679
577
}
680
578
}
681
579
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
580
ret = connect(tcp_sd, &to.in, sizeof(to));
692
581
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
582
perror("connect");
583
return -1;
704
584
}
705
585
706
586
const char *out = mandos_protocol_version;
710
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
591
out_size - written));
712
592
if(ret == -1){
713
int e = errno;
714
593
perror("write");
715
errno = e;
594
retval = -1;
716
595
goto mandos_end;
717
596
}
718
597
written += (size_t)ret;
726
605
break;
727
606
}
728
607
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
608
}
735
609
736
610
if(debug){
737
611
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
612
}
739
613
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
615
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
616
do{
753
617
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
758
618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
619
760
620
if(ret != GNUTLS_E_SUCCESS){
762
622
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
623
gnutls_perror(ret);
764
624
}
765
errno = EPROTO;
625
retval = -1;
766
626
goto mandos_end;
767
627
}
768
628
769
629
/* Read OpenPGP packet that contains the wanted password */
770
630
771
631
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
773
633
ip);
774
634
}
775
635
776
636
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
784
638
buffer_capacity);
785
639
if(buffer_capacity == 0){
786
int e = errno;
787
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
640
perror("adjustbuffer");
641
retval = -1;
794
642
goto mandos_end;
795
643
}
796
644
805
653
case GNUTLS_E_AGAIN:
806
654
break;
807
655
case GNUTLS_E_REHANDSHAKE:
808
do {
656
do{
809
657
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
815
658
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
659
if(ret < 0){
817
660
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
661
gnutls_perror(ret);
819
errno = EPROTO;
662
retval = -1;
820
663
goto mandos_end;
821
664
}
822
665
break;
823
666
default:
824
667
fprintf(stderr, "Unknown error while reading data from"
825
668
" encrypted session with Mandos server\n");
669
retval = -1;
826
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
828
671
goto mandos_end;
829
672
}
830
673
} else {
836
679
fprintf(stderr, "Closing TLS session\n");
837
680
}
838
681
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
851
683
852
684
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
855
686
buffer_length,
856
687
&decrypted_buffer);
857
688
if(decrypted_buffer_size >= 0){
858
859
689
written = 0;
860
690
while(written < (size_t) decrypted_buffer_size){
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
691
ret = (int)fwrite(decrypted_buffer + written, 1,
867
692
(size_t)decrypted_buffer_size - written,
868
693
stdout);
869
694
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
695
if(debug){
872
696
fprintf(stderr, "Error writing encrypted data: %s\n",
873
697
strerror(errno));
874
698
}
875
errno = e;
876
goto mandos_end;
699
retval = -1;
700
break;
877
701
}
878
702
written += (size_t)ret;
879
703
}
880
retval = 0;
704
free(decrypted_buffer);
705
} else {
706
retval = -1;
881
707
}
708
} else {
709
retval = -1;
882
710
}
883
711
884
712
/* Shutdown procedure */
885
713
886
714
mandos_end:
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
903
retval = -1;
904
}
905
errno = e;
715
free(buffer);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
906
719
}
720
gnutls_deinit(session);
907
721
return retval;
908
722
}
909
723
910
724
static void resolve_callback(AvahiSServiceResolver *r,
911
725
AvahiIfIndex interface,
912
AvahiProtocol proto,
726
AVAHI_GCC_UNUSED AvahiProtocol protocol,
913
727
AvahiResolverEvent event,
914
728
const char *name,
915
729
const char *type,
920
734
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
735
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
736
flags,
923
AVAHI_GCC_UNUSED void* userdata){
737
void* userdata) {
738
mandos_context *mc = userdata;
924
739
assert(r);
925
740
926
741
/* Called whenever a service has been resolved successfully or
927
742
timed out */
928
743
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
744
switch(event) {
934
745
default:
935
746
case AVAHI_RESOLVER_FAILURE:
936
747
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
748
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
749
avahi_strerror(avahi_server_errno(mc->server)));
939
750
break;
940
751
941
752
case AVAHI_RESOLVER_FOUND:
947
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
759
ip, (intmax_t)interface, port);
949
760
}
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
761
int ret = start_mandos_communication(ip, port, interface, mc);
952
762
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
763
avahi_simple_poll_quit(mc->simple_poll);
954
764
}
955
765
}
956
766
}
957
767
avahi_s_service_resolver_free(r);
958
768
}
959
769
960
static void browse_callback(AvahiSServiceBrowser *b,
961
AvahiIfIndex interface,
962
AvahiProtocol protocol,
963
AvahiBrowserEvent event,
964
const char *name,
965
const char *type,
966
const char *domain,
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
flags,
969
AVAHI_GCC_UNUSED void* userdata){
770
static void browse_callback( AvahiSServiceBrowser *b,
771
AvahiIfIndex interface,
772
AvahiProtocol protocol,
773
AvahiBrowserEvent event,
774
const char *name,
775
const char *type,
776
const char *domain,
777
AVAHI_GCC_UNUSED AvahiLookupResultFlags
778
flags,
779
void* userdata) {
780
mandos_context *mc = userdata;
970
781
assert(b);
971
782
972
783
/* Called whenever a new services becomes available on the LAN or
973
784
is removed from the LAN */
974
785
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
786
switch(event) {
980
787
default:
981
788
case AVAHI_BROWSER_FAILURE:
982
789
983
790
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
791
avahi_strerror(avahi_server_errno(mc->server)));
792
avahi_simple_poll_quit(mc->simple_poll);
986
793
return;
987
794
988
795
case AVAHI_BROWSER_NEW:
991
798
the callback function is called the Avahi server will free the
992
799
resolver for us. */
993
800
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
802
protocol, name, type, domain,
803
AVAHI_PROTO_INET6, 0,
804
resolve_callback, mc)))
997
805
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
806
name, avahi_strerror(avahi_server_errno(mc->server)));
999
807
break;
1000
808
1001
809
case AVAHI_BROWSER_REMOVE:
1010
818
}
1011
819
}
1012
820
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
1020
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
1024
errno = old_errno;
1025
}
1026
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
if(if_entry->d_name[0] == '.'){
1036
return 0;
1037
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1072
break;
1073
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1083
if(debug){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1086
}
1087
free(flagstring);
1088
return 0;
1089
}
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1094
if(debug){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1097
}
1098
return 0;
1099
}
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1102
if(debug){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1105
}
1106
return 1;
1107
}
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1110
if(debug){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1113
}
1114
return 0;
1115
}
1116
/* Accept this device */
1117
if(debug){
1118
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1119
if_entry->d_name);
1120
}
1121
return 1;
1122
}
1123
1124
821
int main(int argc, char *argv[]){
1125
AvahiSServiceBrowser *sb = NULL;
1126
int error;
1127
int ret;
1128
intmax_t tmpmax;
1129
char *tmp;
1130
int exitcode = EXIT_SUCCESS;
1131
const char *interface = "";
1132
struct ifreq network;
1133
int sd = -1;
1134
bool take_down_interface = false;
1135
uid_t uid;
1136
gid_t gid;
1137
char tempdir[] = "/tmp/mandosXXXXXX";
1138
bool tempdir_created = false;
1139
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
const char *seckey = PATHDIR "/" SECKEY;
1141
const char *pubkey = PATHDIR "/" PUBKEY;
1142
1143
bool gnutls_initialized = false;
1144
bool gpgme_initialized = false;
1145
float delay = 2.5f;
1146
1147
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1148
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
/* Lower any group privileges we might have, just to be safe */
1154
errno = 0;
1155
ret = setgid(gid);
1156
if(ret == -1){
1157
perror("setgid");
1158
}
1159
1160
/* Lower user privileges (temporarily) */
1161
errno = 0;
1162
ret = seteuid(uid);
1163
if(ret == -1){
1164
perror("seteuid");
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
{
1172
struct argp_option options[] = {
1173
{ .name = "debug", .key = 128,
1174
.doc = "Debug mode", .group = 3 },
1175
{ .name = "connect", .key = 'c',
1176
.arg = "ADDRESS:PORT",
1177
.doc = "Connect directly to a specific Mandos server",
1178
.group = 1 },
1179
{ .name = "interface", .key = 'i',
1180
.arg = "NAME",
1181
.doc = "Network interface that will be used to search for"
1182
" Mandos servers",
1183
.group = 1 },
1184
{ .name = "seckey", .key = 's',
1185
.arg = "FILE",
1186
.doc = "OpenPGP secret key file base name",
1187
.group = 1 },
1188
{ .name = "pubkey", .key = 'p',
1189
.arg = "FILE",
1190
.doc = "OpenPGP public key file base name",
1191
.group = 2 },
1192
{ .name = "dh-bits", .key = 129,
1193
.arg = "BITS",
1194
.doc = "Bit length of the prime number used in the"
1195
" Diffie-Hellman key exchange",
1196
.group = 2 },
1197
{ .name = "priority", .key = 130,
1198
.arg = "STRING",
1199
.doc = "GnuTLS priority string for the TLS handshake",
1200
.group = 1 },
1201
{ .name = "delay", .key = 131,
1202
.arg = "SECONDS",
1203
.doc = "Maximum delay to wait for interface startup",
1204
.group = 2 },
1205
/*
1206
* These reproduce what we would get without ARGP_NO_HELP
1207
*/
1208
{ .name = "help", .key = '?',
1209
.doc = "Give this help list", .group = -1 },
1210
{ .name = "usage", .key = -3,
1211
.doc = "Give a short usage message", .group = -1 },
1212
{ .name = "version", .key = 'V',
1213
.doc = "Print program version", .group = -1 },
1214
{ .name = NULL }
1215
};
1216
1217
error_t parse_opt(int key, char *arg,
1218
struct argp_state *state){
1219
errno = 0;
1220
switch(key){
1221
case 128: /* --debug */
1222
debug = true;
1223
break;
1224
case 'c': /* --connect */
1225
connect_to = arg;
1226
break;
1227
case 'i': /* --interface */
1228
interface = arg;
1229
break;
1230
case 's': /* --seckey */
1231
seckey = arg;
1232
break;
1233
case 'p': /* --pubkey */
1234
pubkey = arg;
1235
break;
1236
case 129: /* --dh-bits */
1237
errno = 0;
1238
tmpmax = strtoimax(arg, &tmp, 10);
1239
if(errno != 0 or tmp == arg or *tmp != '\0'
1240
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1241
argp_error(state, "Bad number of DH bits");
1242
}
1243
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1244
break;
1245
case 130: /* --priority */
1246
mc.priority = arg;
1247
break;
1248
case 131: /* --delay */
1249
errno = 0;
1250
delay = strtof(arg, &tmp);
1251
if(errno != 0 or tmp == arg or *tmp != '\0'){
1252
argp_error(state, "Bad delay");
1253
}
1254
break;
1255
/*
1256
* These reproduce what we would get without ARGP_NO_HELP
1257
*/
1258
case '?': /* --help */
1259
argp_state_help(state, state->out_stream,
1260
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1261
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1262
case -3: /* --usage */
1263
argp_state_help(state, state->out_stream,
1264
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1265
case 'V': /* --version */
1266
fprintf(state->out_stream, "%s\n", argp_program_version);
1267
exit(argp_err_exit_status);
1268
break;
1269
default:
1270
return ARGP_ERR_UNKNOWN;
1271
}
1272
return errno;
1273
}
1274
1275
struct argp argp = { .options = options, .parser = parse_opt,
1276
.args_doc = "",
1277
.doc = "Mandos client -- Get and decrypt"
1278
" passwords from a Mandos server" };
1279
ret = argp_parse(&argp, argc, argv,
1280
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1281
switch(ret){
1282
case 0:
1283
break;
1284
case ENOMEM:
1285
default:
1286
errno = ret;
1287
perror("argp_parse");
1288
exitcode = EX_OSERR;
1289
goto end;
1290
case EINVAL:
1291
exitcode = EX_USAGE;
1292
goto end;
1293
}
1294
}
1295
1296
if(not debug){
1297
avahi_set_log_function(empty_log);
1298
}
822
AvahiSServiceBrowser *sb = NULL;
823
int error;
824
int ret;
825
intmax_t tmpmax;
826
int numchars;
827
int exitcode = EXIT_SUCCESS;
828
const char *interface = "eth0";
829
struct ifreq network;
830
int sd;
831
uid_t uid;
832
gid_t gid;
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
838
839
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initalized = false;
843
bool gpgme_initalized = false;
844
double delay = 2.5;
845
846
{
847
struct argp_option options[] = {
848
{ .name = "debug", .key = 128,
849
.doc = "Debug mode", .group = 3 },
850
{ .name = "connect", .key = 'c',
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
853
.group = 1 },
854
{ .name = "interface", .key = 'i',
855
.arg = "NAME",
856
.doc = "Interface that will be used to search for Mandos"
857
" servers",
858
.group = 1 },
859
{ .name = "seckey", .key = 's',
860
.arg = "FILE",
861
.doc = "OpenPGP secret key file base name",
862
.group = 1 },
863
{ .name = "pubkey", .key = 'p',
864
.arg = "FILE",
865
.doc = "OpenPGP public key file base name",
866
.group = 2 },
867
{ .name = "dh-bits", .key = 129,
868
.arg = "BITS",
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
871
.group = 2 },
872
{ .name = "priority", .key = 130,
873
.arg = "STRING",
874
.doc = "GnuTLS priority string for the TLS handshake",
875
.group = 1 },
876
{ .name = "delay", .key = 131,
877
.arg = "SECONDS",
878
.doc = "Maximum delay to wait for interface startup",
879
.group = 2 },
880
{ .name = NULL }
881
};
882
883
error_t parse_opt(int key, char *arg,
884
struct argp_state *state) {
885
switch(key) {
886
case 128: /* --debug */
887
debug = true;
888
break;
889
case 'c': /* --connect */
890
connect_to = arg;
891
break;
892
case 'i': /* --interface */
893
interface = arg;
894
break;
895
case 's': /* --seckey */
896
seckey = arg;
897
break;
898
case 'p': /* --pubkey */
899
pubkey = arg;
900
break;
901
case 129: /* --dh-bits */
902
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
903
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
904
or arg[numchars] != '\0'){
905
fprintf(stderr, "Bad number of DH bits\n");
906
exit(EXIT_FAILURE);
907
}
908
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
909
break;
910
case 130: /* --priority */
911
mc.priority = arg;
912
break;
913
case 131: /* --delay */
914
ret = sscanf(arg, "%lf%n", &delay, &numchars);
915
if(ret < 1 or arg[numchars] != '\0'){
916
fprintf(stderr, "Bad delay\n");
917
exit(EXIT_FAILURE);
918
}
919
break;
920
case ARGP_KEY_ARG:
921
argp_usage(state);
922
case ARGP_KEY_END:
923
break;
924
default:
925
return ARGP_ERR_UNKNOWN;
926
}
927
return 0;
928
}
929
930
struct argp argp = { .options = options, .parser = parse_opt,
931
.args_doc = "",
932
.doc = "Mandos client -- Get and decrypt"
933
" passwords from a Mandos server" };
934
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
935
if(ret == ARGP_ERR_UNKNOWN){
936
fprintf(stderr, "Unknown error while parsing arguments\n");
937
exitcode = EXIT_FAILURE;
938
goto end;
939
}
940
}
941
942
/* If the interface is down, bring it up */
943
{
944
// Lower kernel loglevel to KERN_NOTICE to avoid
945
// KERN_INFO messages to mess up the prompt
946
ret = klogctl(8, NULL, 5);
947
if(ret == -1){
948
perror("klogctl");
949
}
1299
950
1300
if(interface[0] == '\0'){
1301
struct dirent **direntries;
1302
ret = scandir(sys_class_net, &direntries, good_interface,
1303
alphasort);
1304
if(ret >= 1){
1305
/* Pick the first good interface */
1306
interface = strdup(direntries[0]->d_name);
1307
if(debug){
1308
fprintf(stderr, "Using interface \"%s\"\n", interface);
1309
}
1310
if(interface == NULL){
1311
perror("malloc");
1312
free(direntries);
1313
exitcode = EXIT_FAILURE;
1314
goto end;
1315
}
1316
free(direntries);
1317
} else {
1318
free(direntries);
1319
fprintf(stderr, "Could not find a network interface\n");
1320
exitcode = EXIT_FAILURE;
1321
goto end;
1322
}
1323
}
1324
1325
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1326
from the signal handler */
1327
/* Initialize the pseudo-RNG for Avahi */
1328
srand((unsigned int) time(NULL));
1329
mc.simple_poll = avahi_simple_poll_new();
1330
if(mc.simple_poll == NULL){
1331
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1332
exitcode = EX_UNAVAILABLE;
1333
goto end;
1334
}
1335
1336
sigemptyset(&sigterm_action.sa_mask);
1337
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1338
if(ret == -1){
1339
perror("sigaddset");
1340
exitcode = EX_OSERR;
1341
goto end;
1342
}
1343
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1344
if(ret == -1){
1345
perror("sigaddset");
1346
exitcode = EX_OSERR;
1347
goto end;
1348
}
1349
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1350
if(ret == -1){
1351
perror("sigaddset");
1352
exitcode = EX_OSERR;
1353
goto end;
1354
}
1355
/* Need to check if the handler is SIG_IGN before handling:
1356
| [[info:libc:Initial Signal Actions]] |
1357
| [[info:libc:Basic Signal Handling]] |
1358
*/
1359
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1360
if(ret == -1){
1361
perror("sigaction");
1362
return EX_OSERR;
1363
}
1364
if(old_sigterm_action.sa_handler != SIG_IGN){
1365
ret = sigaction(SIGINT, &sigterm_action, NULL);
1366
if(ret == -1){
1367
perror("sigaction");
1368
exitcode = EX_OSERR;
1369
goto end;
1370
}
1371
}
1372
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1373
if(ret == -1){
1374
perror("sigaction");
1375
return EX_OSERR;
1376
}
1377
if(old_sigterm_action.sa_handler != SIG_IGN){
1378
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1379
if(ret == -1){
1380
perror("sigaction");
1381
exitcode = EX_OSERR;
1382
goto end;
1383
}
1384
}
1385
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1386
if(ret == -1){
1387
perror("sigaction");
1388
return EX_OSERR;
1389
}
1390
if(old_sigterm_action.sa_handler != SIG_IGN){
1391
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1392
if(ret == -1){
1393
perror("sigaction");
1394
exitcode = EX_OSERR;
1395
goto end;
1396
}
1397
}
1398
1399
/* If the interface is down, bring it up */
1400
if(strcmp(interface, "none") != 0){
1401
if_index = (AvahiIfIndex) if_nametoindex(interface);
1402
if(if_index == 0){
1403
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1404
exitcode = EX_UNAVAILABLE;
1405
goto end;
1406
}
1407
1408
if(quit_now){
1409
goto end;
1410
}
1411
1412
/* Re-raise priviliges */
1413
errno = 0;
1414
ret = seteuid(0);
1415
if(ret == -1){
1416
perror("seteuid");
1417
}
1418
1419
#ifdef __linux__
1420
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1421
messages about the network interface to mess up the prompt */
1422
ret = klogctl(8, NULL, 5);
1423
bool restore_loglevel = true;
1424
if(ret == -1){
1425
restore_loglevel = false;
1426
perror("klogctl");
1427
}
1428
#endif /* __linux__ */
1429
1430
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1431
if(sd < 0){
1432
perror("socket");
1433
exitcode = EX_OSERR;
1434
#ifdef __linux__
1435
if(restore_loglevel){
1436
ret = klogctl(7, NULL, 0);
1437
if(ret == -1){
1438
perror("klogctl");
1439
}
1440
}
1441
#endif /* __linux__ */
1442
/* Lower privileges */
1443
errno = 0;
1444
ret = seteuid(uid);
1445
if(ret == -1){
1446
perror("seteuid");
1447
}
1448
goto end;
1449
}
1450
strcpy(network.ifr_name, interface);
1451
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1452
if(ret == -1){
1453
perror("ioctl SIOCGIFFLAGS");
1454
#ifdef __linux__
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1457
if(ret == -1){
1458
perror("klogctl");
1459
}
1460
}
1461
#endif /* __linux__ */
1462
exitcode = EX_OSERR;
1463
/* Lower privileges */
1464
errno = 0;
1465
ret = seteuid(uid);
1466
if(ret == -1){
1467
perror("seteuid");
1468
}
1469
goto end;
1470
}
1471
if((network.ifr_flags & IFF_UP) == 0){
1472
network.ifr_flags |= IFF_UP;
1473
take_down_interface = true;
1474
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1475
if(ret == -1){
1476
take_down_interface = false;
1477
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1478
exitcode = EX_OSERR;
1479
#ifdef __linux__
1480
if(restore_loglevel){
951
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
952
if(sd < 0) {
953
perror("socket");
954
exitcode = EXIT_FAILURE;
955
ret = klogctl(7, NULL, 0);
956
if(ret == -1){
957
perror("klogctl");
958
}
959
goto end;
960
}
961
strcpy(network.ifr_name, interface);
962
ret = ioctl(sd, SIOCGIFFLAGS, &network);
963
if(ret == -1){
964
perror("ioctl SIOCGIFFLAGS");
965
ret = klogctl(7, NULL, 0);
966
if(ret == -1){
967
perror("klogctl");
968
}
969
exitcode = EXIT_FAILURE;
970
goto end;
971
}
972
if((network.ifr_flags & IFF_UP) == 0){
973
network.ifr_flags |= IFF_UP;
974
ret = ioctl(sd, SIOCSIFFLAGS, &network);
975
if(ret == -1){
976
perror("ioctl SIOCSIFFLAGS");
977
exitcode = EXIT_FAILURE;
1481
978
ret = klogctl(7, NULL, 0);
1482
979
if(ret == -1){
1483
980
perror("klogctl");
1484
981
}
982
goto end;
1485
983
}
1486
#endif /* __linux__ */
1487
/* Lower privileges */
1488
errno = 0;
1489
ret = seteuid(uid);
984
}
985
// sleep checking until interface is running
986
for(int i=0; i < delay * 4; i++){
987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1490
988
if(ret == -1){
1491
perror("seteuid");
989
perror("ioctl SIOCGIFFLAGS");
990
} else if(network.ifr_flags & IFF_RUNNING){
991
break;
1492
992
}
1493
goto end;
1494
}
1495
}
1496
/* sleep checking until interface is running */
1497
for(int i=0; i < delay * 4; i++){
1498
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1499
if(ret == -1){
1500
perror("ioctl SIOCGIFFLAGS");
1501
} else if(network.ifr_flags & IFF_RUNNING){
1502
break;
1503
}
1504
struct timespec sleeptime = { .tv_nsec = 250000000 };
1505
ret = nanosleep(&sleeptime, NULL);
1506
if(ret == -1 and errno != EINTR){
1507
perror("nanosleep");
1508
}
1509
}
1510
if(not take_down_interface){
1511
/* We won't need the socket anymore */
993
struct timespec sleeptime = { .tv_nsec = 250000000 };
994
nanosleep(&sleeptime, NULL);
995
}
1512
996
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1513
997
if(ret == -1){
1514
998
perror("close");
1515
999
}
1516
}
1517
#ifdef __linux__
1518
if(restore_loglevel){
1519
/* Restores kernel loglevel to default */
1000
// Restores kernel loglevel to default
1520
1001
ret = klogctl(7, NULL, 0);
1521
1002
if(ret == -1){
1522
1003
perror("klogctl");
1523
1004
}
1524
1005
}
1525
#endif /* __linux__ */
1526
/* Lower privileges */
1527
errno = 0;
1528
if(take_down_interface){
1529
/* Lower privileges */
1530
ret = seteuid(uid);
1531
if(ret == -1){
1532
perror("seteuid");
1533
}
1534
} else {
1535
/* Lower privileges permanently */
1536
ret = setuid(uid);
1537
if(ret == -1){
1538
perror("setuid");
1539
}
1540
}
1541
}
1542
1543
if(quit_now){
1544
goto end;
1545
}
1546
1547
ret = init_gnutls_global(pubkey, seckey);
1548
if(ret == -1){
1549
fprintf(stderr, "init_gnutls_global failed\n");
1550
exitcode = EX_UNAVAILABLE;
1551
goto end;
1552
} else {
1553
gnutls_initialized = true;
1554
}
1555
1556
if(quit_now){
1557
goto end;
1558
}
1559
1560
tempdir_created = true;
1561
if(mkdtemp(tempdir) == NULL){
1562
tempdir_created = false;
1563
perror("mkdtemp");
1564
goto end;
1565
}
1566
1567
if(quit_now){
1568
goto end;
1569
}
1570
1571
if(not init_gpgme(pubkey, seckey, tempdir)){
1572
fprintf(stderr, "init_gpgme failed\n");
1573
exitcode = EX_UNAVAILABLE;
1574
goto end;
1575
} else {
1576
gpgme_initialized = true;
1577
}
1578
1579
if(quit_now){
1580
goto end;
1581
}
1582
1583
if(connect_to != NULL){
1584
/* Connect directly, do not use Zeroconf */
1585
/* (Mainly meant for debugging) */
1586
char *address = strrchr(connect_to, ':');
1587
if(address == NULL){
1588
fprintf(stderr, "No colon in address\n");
1589
exitcode = EX_USAGE;
1590
goto end;
1591
}
1592
1593
if(quit_now){
1594
goto end;
1595
}
1596
1597
uint16_t port;
1598
errno = 0;
1599
tmpmax = strtoimax(address+1, &tmp, 10);
1600
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1601
or tmpmax != (uint16_t)tmpmax){
1602
fprintf(stderr, "Bad port number\n");
1603
exitcode = EX_USAGE;
1604
goto end;
1605
}
1606
1607
if(quit_now){
1608
goto end;
1609
}
1610
1611
port = (uint16_t)tmpmax;
1612
*address = '\0';
1613
address = connect_to;
1614
/* Colon in address indicates IPv6 */
1615
int af;
1616
if(strchr(address, ':') != NULL){
1617
af = AF_INET6;
1618
} else {
1619
af = AF_INET;
1620
}
1621
1622
if(quit_now){
1623
goto end;
1624
}
1625
1626
while(not quit_now){
1627
ret = start_mandos_communication(address, port, if_index, af);
1628
if(quit_now or ret == 0){
1629
break;
1630
}
1631
sleep(15);
1632
};
1633
1634
if (not quit_now){
1635
exitcode = EXIT_SUCCESS;
1636
}
1637
1638
goto end;
1639
}
1640
1641
if(quit_now){
1642
goto end;
1643
}
1644
1645
{
1646
AvahiServerConfig config;
1647
/* Do not publish any local Zeroconf records */
1648
avahi_server_config_init(&config);
1649
config.publish_hinfo = 0;
1650
config.publish_addresses = 0;
1651
config.publish_workstation = 0;
1652
config.publish_domain = 0;
1653
1654
/* Allocate a new server */
1655
mc.server = avahi_server_new(avahi_simple_poll_get
1656
(mc.simple_poll), &config, NULL,
1657
NULL, &error);
1658
1659
/* Free the Avahi configuration data */
1660
avahi_server_config_free(&config);
1661
}
1662
1663
/* Check if creating the Avahi server object succeeded */
1664
if(mc.server == NULL){
1665
fprintf(stderr, "Failed to create Avahi server: %s\n",
1666
avahi_strerror(error));
1667
exitcode = EX_UNAVAILABLE;
1668
goto end;
1669
}
1670
1671
if(quit_now){
1672
goto end;
1673
}
1674
1675
/* Create the Avahi service browser */
1676
sb = avahi_s_service_browser_new(mc.server, if_index,
1677
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1678
NULL, 0, browse_callback, NULL);
1679
if(sb == NULL){
1680
fprintf(stderr, "Failed to create service browser: %s\n",
1681
avahi_strerror(avahi_server_errno(mc.server)));
1682
exitcode = EX_UNAVAILABLE;
1683
goto end;
1684
}
1685
1686
if(quit_now){
1687
goto end;
1688
}
1689
1690
/* Run the main loop */
1691
1692
if(debug){
1693
fprintf(stderr, "Starting Avahi loop search\n");
1694
}
1695
1696
avahi_simple_poll_loop(mc.simple_poll);
1697
1006
1007
uid = getuid();
1008
gid = getgid();
1009
1010
ret = setuid(uid);
1011
if(ret == -1){
1012
perror("setuid");
1013
}
1014
1015
setgid(gid);
1016
if(ret == -1){
1017
perror("setgid");
1018
}
1019
1020
ret = init_gnutls_global(&mc, pubkey, seckey);
1021
if(ret == -1){
1022
fprintf(stderr, "init_gnutls_global failed\n");
1023
exitcode = EXIT_FAILURE;
1024
goto end;
1025
} else {
1026
gnutls_initalized = true;
1027
}
1028
1029
if(mkdtemp(tempdir) == NULL){
1030
perror("mkdtemp");
1031
tempdir[0] = '\0';
1032
goto end;
1033
}
1034
1035
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1036
fprintf(stderr, "gpgme_initalized failed\n");
1037
exitcode = EXIT_FAILURE;
1038
goto end;
1039
} else {
1040
gpgme_initalized = true;
1041
}
1042
1043
if_index = (AvahiIfIndex) if_nametoindex(interface);
1044
if(if_index == 0){
1045
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1046
exit(EXIT_FAILURE);
1047
}
1048
1049
if(connect_to != NULL){
1050
/* Connect directly, do not use Zeroconf */
1051
/* (Mainly meant for debugging) */
1052
char *address = strrchr(connect_to, ':');
1053
if(address == NULL){
1054
fprintf(stderr, "No colon in address\n");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
uint16_t port;
1059
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1060
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1061
or address[numchars+1] != '\0'){
1062
fprintf(stderr, "Bad port number\n");
1063
exitcode = EXIT_FAILURE;
1064
goto end;
1065
}
1066
port = (uint16_t)tmpmax;
1067
*address = '\0';
1068
address = connect_to;
1069
ret = start_mandos_communication(address, port, if_index, &mc);
1070
if(ret < 0){
1071
exitcode = EXIT_FAILURE;
1072
} else {
1073
exitcode = EXIT_SUCCESS;
1074
}
1075
goto end;
1076
}
1077
1078
if(not debug){
1079
avahi_set_log_function(empty_log);
1080
}
1081
1082
/* Initialize the pseudo-RNG for Avahi */
1083
srand((unsigned int) time(NULL));
1084
1085
/* Allocate main Avahi loop object */
1086
mc.simple_poll = avahi_simple_poll_new();
1087
if(mc.simple_poll == NULL) {
1088
fprintf(stderr, "Avahi: Failed to create simple poll"
1089
" object.\n");
1090
exitcode = EXIT_FAILURE;
1091
goto end;
1092
}
1093
1094
{
1095
AvahiServerConfig config;
1096
/* Do not publish any local Zeroconf records */
1097
avahi_server_config_init(&config);
1098
config.publish_hinfo = 0;
1099
config.publish_addresses = 0;
1100
config.publish_workstation = 0;
1101
config.publish_domain = 0;
1102
1103
/* Allocate a new server */
1104
mc.server = avahi_server_new(avahi_simple_poll_get
1105
(mc.simple_poll), &config, NULL,
1106
NULL, &error);
1107
1108
/* Free the Avahi configuration data */
1109
avahi_server_config_free(&config);
1110
}
1111
1112
/* Check if creating the Avahi server object succeeded */
1113
if(mc.server == NULL) {
1114
fprintf(stderr, "Failed to create Avahi server: %s\n",
1115
avahi_strerror(error));
1116
exitcode = EXIT_FAILURE;
1117
goto end;
1118
}
1119
1120
/* Create the Avahi service browser */
1121
sb = avahi_s_service_browser_new(mc.server, if_index,
1122
AVAHI_PROTO_INET6,
1123
"_mandos._tcp", NULL, 0,
1124
browse_callback, &mc);
1125
if(sb == NULL) {
1126
fprintf(stderr, "Failed to create service browser: %s\n",
1127
avahi_strerror(avahi_server_errno(mc.server)));
1128
exitcode = EXIT_FAILURE;
1129
goto end;
1130
}
1131
1132
/* Run the main loop */
1133
1134
if(debug){
1135
fprintf(stderr, "Starting Avahi loop search\n");
1136
}
1137
1138
avahi_simple_poll_loop(mc.simple_poll);
1139
1698
1140
end:
1699
1700
if(debug){
1701
fprintf(stderr, "%s exiting\n", argv[0]);
1702
}
1703
1704
/* Cleanup things */
1705
if(sb != NULL)
1706
avahi_s_service_browser_free(sb);
1707
1708
if(mc.server != NULL)
1709
avahi_server_free(mc.server);
1710
1711
if(mc.simple_poll != NULL)
1712
avahi_simple_poll_free(mc.simple_poll);
1713
1714
if(gnutls_initialized){
1715
gnutls_certificate_free_credentials(mc.cred);
1716
gnutls_global_deinit();
1717
gnutls_dh_params_deinit(mc.dh_params);
1718
}
1719
1720
if(gpgme_initialized){
1721
gpgme_release(mc.ctx);
1722
}
1723
1724
/* Take down the network interface */
1725
if(take_down_interface){
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror("seteuid");
1731
}
1732
if(geteuid() == 0){
1733
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1734
if(ret == -1){
1735
perror("ioctl SIOCGIFFLAGS");
1736
} else if(network.ifr_flags & IFF_UP) {
1737
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1738
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1739
if(ret == -1){
1740
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1741
}
1742
}
1743
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1744
if(ret == -1){
1745
perror("close");
1746
}
1747
/* Lower privileges permanently */
1748
errno = 0;
1749
ret = setuid(uid);
1750
if(ret == -1){
1751
perror("setuid");
1752
}
1753
}
1754
}
1755
1756
/* Removes the temp directory used by GPGME */
1757
if(tempdir_created){
1758
DIR *d;
1759
struct dirent *direntry;
1760
d = opendir(tempdir);
1761
if(d == NULL){
1762
if(errno != ENOENT){
1763
perror("opendir");
1764
}
1765
} else {
1766
while(true){
1767
direntry = readdir(d);
1768
if(direntry == NULL){
1769
break;
1770
}
1771
/* Skip "." and ".." */
1772
if(direntry->d_name[0] == '.'
1773
and (direntry->d_name[1] == '\0'
1774
or (direntry->d_name[1] == '.'
1775
and direntry->d_name[2] == '\0'))){
1776
continue;
1777
}
1778
char *fullname = NULL;
1779
ret = asprintf(&fullname, "%s/%s", tempdir,
1780
direntry->d_name);
1781
if(ret < 0){
1782
perror("asprintf");
1783
continue;
1784
}
1785
ret = remove(fullname);
1786
if(ret == -1){
1787
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1788
strerror(errno));
1789
}
1790
free(fullname);
1791
}
1792
closedir(d);
1793
}
1794
ret = rmdir(tempdir);
1795
if(ret == -1 and errno != ENOENT){
1796
perror("rmdir");
1797
}
1798
}
1799
1800
if(quit_now){
1801
sigemptyset(&old_sigterm_action.sa_mask);
1802
old_sigterm_action.sa_handler = SIG_DFL;
1803
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1804
&old_sigterm_action,
1805
NULL));
1806
if(ret == -1){
1807
perror("sigaction");
1808
}
1809
do {
1810
ret = raise(signal_received);
1811
} while(ret != 0 and errno == EINTR);
1812
if(ret != 0){
1813
perror("raise");
1814
abort();
1815
}
1816
TEMP_FAILURE_RETRY(pause());
1817
}
1818
1819
return exitcode;
1141
1142
if(debug){
1143
fprintf(stderr, "%s exiting\n", argv[0]);
1144
}
1145
1146
/* Cleanup things */
1147
if(sb != NULL)
1148
avahi_s_service_browser_free(sb);
1149
1150
if(mc.server != NULL)
1151
avahi_server_free(mc.server);
1152
1153
if(mc.simple_poll != NULL)
1154
avahi_simple_poll_free(mc.simple_poll);
1155
1156
if(gnutls_initalized){
1157
gnutls_certificate_free_credentials(mc.cred);
1158
gnutls_global_deinit();
1159
gnutls_dh_params_deinit(mc.dh_params);
1160
}
1161
1162
if(gpgme_initalized){
1163
gpgme_release(mc.ctx);
1164
}
1165
1166
/* Removes the temp directory used by GPGME */
1167
if(tempdir[0] != '\0'){
1168
DIR *d;
1169
struct dirent *direntry;
1170
d = opendir(tempdir);
1171
if(d == NULL){
1172
if(errno != ENOENT){
1173
perror("opendir");
1174
}
1175
} else {
1176
while(true){
1177
direntry = readdir(d);
1178
if(direntry == NULL){
1179
break;
1180
}
1181
if(direntry->d_type == DT_REG){
1182
char *fullname = NULL;
1183
ret = asprintf(&fullname, "%s/%s", tempdir,
1184
direntry->d_name);
1185
if(ret < 0){
1186
perror("asprintf");
1187
continue;
1188
}
1189
ret = unlink(fullname);
1190
if(ret == -1){
1191
fprintf(stderr, "unlink(\"%s\"): %s",
1192
fullname, strerror(errno));
1193
}
1194
free(fullname);
1195
}
1196
}
1197
closedir(d);
1198
}
1199
ret = rmdir(tempdir);
1200
if(ret == -1 and errno != ENOENT){
1201
perror("rmdir");
1202
}
1203
}
1204
1205
return exitcode;
1820
1206
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0