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237.2.30
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:45:33 UTC
- mto: (24.1.123 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 245.
- Revision ID: teddy@fukt.bsnet.se-20090113044533-de691yv0fa5w6quw
* plugins.d/mandos-client.c: Only comment changes.
- files removed:
- DBUS-API
- files renamed:
- mandos-ctl => mandos-list
- 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
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, SCNu16 */
64
61
#include <assert.h> /* assert() */
65
62
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
63
#include <time.h> /* time() */
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
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
91
77
92
78
/* Avahi */
93
79
/* All Avahi types, constants and functions
127
113
static const char mandos_protocol_version[] = "1";
128
114
const char *argp_program_version = "mandos-client " VERSION;
129
115
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
116
133
117
/* Used for passing in values through the Avahi callback functions */
134
118
typedef struct {
141
125
gpgme_ctx_t ctx;
142
126
} mandos_context;
143
127
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
128
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
155
131
* "buffer_length" is how much is already used.
156
132
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
134
size_t buffer_capacity){
159
135
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
169
145
/*
170
146
* Initialize GPGME.
171
147
*/
172
static bool init_gpgme(const char *seckey,
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
173
149
const char *pubkey, const char *tempdir){
150
int ret;
174
151
gpgme_error_t rc;
175
152
gpgme_engine_info_t engine_info;
176
153
177
154
178
155
/*
179
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
180
157
*/
181
158
bool import_key(const char *filename){
182
int ret;
183
159
int fd;
184
160
gpgme_data_t pgp_data;
185
161
196
172
return false;
197
173
}
198
174
199
rc = gpgme_op_import(mc.ctx, pgp_data);
175
rc = gpgme_op_import(mc->ctx, pgp_data);
200
176
if(rc != GPG_ERR_NO_ERROR){
201
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
178
gpgme_strsource(rc), gpgme_strerror(rc));
212
188
}
213
189
214
190
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
191
fprintf(stderr, "Initialize gpgme\n");
216
192
}
217
193
218
194
/* Init GPGME */
245
221
}
246
222
247
223
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
224
rc = gpgme_new(&(mc->ctx));
249
225
if(rc != GPG_ERR_NO_ERROR){
250
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
227
gpgme_strsource(rc), gpgme_strerror(rc));
256
232
return false;
257
233
}
258
234
259
return true;
235
return true;
260
236
}
261
237
262
238
/*
263
239
* Decrypt OpenPGP data.
264
240
* Returns -1 on error
265
241
*/
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
267
244
size_t crypto_size,
268
245
char **plaintext){
269
246
gpgme_data_t dh_crypto, dh_plain;
296
273
297
274
/* Decrypt data from the cryptotext data buffer to the plaintext
298
275
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
300
277
if(rc != GPG_ERR_NO_ERROR){
301
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
279
gpgme_strsource(rc), gpgme_strerror(rc));
303
280
plaintext_length = -1;
304
281
if(debug){
305
282
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
283
result = gpgme_op_decrypt_result(mc->ctx);
307
284
if(result == NULL){
308
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
309
286
} else {
316
293
}
317
294
gpgme_recipient_t recipient;
318
295
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;
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
}
327
306
}
328
307
}
329
308
}
343
322
344
323
*plaintext = NULL;
345
324
while(true){
346
plaintext_capacity = incbuffer(plaintext,
325
plaintext_capacity = adjustbuffer(plaintext,
347
326
(size_t)plaintext_length,
348
327
plaintext_capacity);
349
328
if(plaintext_capacity == 0){
350
perror("incbuffer");
329
perror("adjustbuffer");
351
330
plaintext_length = -1;
352
331
goto decrypt_end;
353
332
}
385
364
return plaintext_length;
386
365
}
387
366
388
static const char * safer_gnutls_strerror(int value){
367
static const char * safer_gnutls_strerror(int value) {
389
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
369
-Wunreachable-code */
391
370
if(ret == NULL)
399
378
fprintf(stderr, "GnuTLS: %s", string);
400
379
}
401
380
402
static int init_gnutls_global(const char *pubkeyfilename,
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
403
383
const char *seckeyfilename){
404
384
int ret;
405
385
408
388
}
409
389
410
390
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
391
if(ret != GNUTLS_E_SUCCESS) {
412
392
fprintf(stderr, "GnuTLS global_init: %s\n",
413
393
safer_gnutls_strerror(ret));
414
394
return -1;
423
403
}
424
404
425
405
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
406
gnutls_certificate_allocate_credentials(&mc->cred);
427
407
if(ret != GNUTLS_E_SUCCESS){
428
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
409
* from
410
* -Wunreachable-code
411
*/
432
412
safer_gnutls_strerror(ret));
433
413
gnutls_global_deinit();
434
414
return -1;
441
421
}
442
422
443
423
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
424
(mc->cred, pubkeyfilename, seckeyfilename,
445
425
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
426
if(ret != GNUTLS_E_SUCCESS) {
447
427
fprintf(stderr,
448
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
453
433
}
454
434
455
435
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
436
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
458
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
439
" %s\n", safer_gnutls_strerror(ret));
460
440
goto globalfail;
461
441
}
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
464
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
445
safer_gnutls_strerror(ret));
466
446
goto globalfail;
467
447
}
468
448
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
450
471
451
return 0;
472
452
473
453
globalfail:
474
454
475
gnutls_certificate_free_credentials(mc.cred);
455
gnutls_certificate_free_credentials(mc->cred);
476
456
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
457
gnutls_dh_params_deinit(mc->dh_params);
478
458
return -1;
479
459
}
480
460
481
static int init_gnutls_session(gnutls_session_t *session){
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
482
463
int ret;
483
464
/* 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);
465
ret = gnutls_init(session, GNUTLS_SERVER);
490
466
if(ret != GNUTLS_E_SUCCESS){
491
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
468
safer_gnutls_strerror(ret));
494
470
495
471
{
496
472
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){
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
505
475
fprintf(stderr, "Syntax error at: %s\n", err);
506
476
fprintf(stderr, "GnuTLS error: %s\n",
507
477
safer_gnutls_strerror(ret));
510
480
}
511
481
}
512
482
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){
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
522
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
487
safer_gnutls_strerror(ret));
524
488
gnutls_deinit(*session);
526
490
}
527
491
528
492
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
530
495
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
532
497
533
498
return 0;
534
499
}
540
505
/* Called when a Mandos server is found */
541
506
static int start_mandos_communication(const char *ip, uint16_t port,
542
507
AvahiIfIndex if_index,
543
int af){
544
int ret, tcp_sd = -1;
508
mandos_context *mc){
509
int ret, tcp_sd;
545
510
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
550
512
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
513
char *decrypted_buffer;
552
514
size_t buffer_length = 0;
553
515
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
554
517
size_t written;
555
int retval = -1;
518
int retval = 0;
519
char interface[IF_NAMESIZE];
556
520
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);
521
522
ret = init_gnutls_session(mc, &session);
580
523
if(ret != 0){
581
524
return -1;
582
525
}
583
526
584
527
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
586
529
"\n", ip, port);
587
530
}
588
531
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
592
534
perror("socket");
593
errno = e;
594
goto mandos_end;
535
return -1;
595
536
}
596
537
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
600
544
}
601
545
602
546
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
}
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
610
551
if(ret < 0 ){
611
int e = errno;
612
552
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
553
return -1;
615
554
}
616
555
if(ret == 0){
617
int e = errno;
618
556
fprintf(stderr, "Bad address: %s\n", ip);
619
errno = e;
620
goto mandos_end;
557
return -1;
621
558
}
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
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
641
560
-Wconversion and
642
561
-Wunreachable-code */
643
}
644
562
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
563
to.in6.sin6_scope_id = (uint32_t)if_index;
649
564
650
565
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){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
674
571
perror("inet_ntop");
675
572
} else {
676
573
if(strcmp(addrstr, ip) != 0){
679
576
}
680
577
}
681
578
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
}
579
ret = connect(tcp_sd, &to.in, sizeof(to));
692
580
if(ret < 0){
693
int e = errno;
694
581
perror("connect");
695
errno = e;
696
goto mandos_end;
697
}
698
699
if(quit_now){
700
errno = EINTR;
701
goto mandos_end;
582
return -1;
702
583
}
703
584
704
585
const char *out = mandos_protocol_version;
708
589
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
709
590
out_size - written));
710
591
if(ret == -1){
711
int e = errno;
712
592
perror("write");
713
errno = e;
593
retval = -1;
714
594
goto mandos_end;
715
595
}
716
596
written += (size_t)ret;
724
604
break;
725
605
}
726
606
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
731
}
732
607
}
733
608
734
609
if(debug){
735
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
736
611
}
737
612
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
744
614
745
if(quit_now){
746
errno = EINTR;
747
goto mandos_end;
748
}
749
750
do {
615
do{
751
616
ret = gnutls_handshake(session);
752
if(quit_now){
753
errno = EINTR;
754
goto mandos_end;
755
}
756
617
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
757
618
758
619
if(ret != GNUTLS_E_SUCCESS){
760
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
761
622
gnutls_perror(ret);
762
623
}
763
errno = EPROTO;
624
retval = -1;
764
625
goto mandos_end;
765
626
}
766
627
767
628
/* Read OpenPGP packet that contains the wanted password */
768
629
769
630
if(debug){
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
771
632
ip);
772
633
}
773
634
774
635
while(true){
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
buffer_capacity = incbuffer(&buffer, buffer_length,
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
782
637
buffer_capacity);
783
638
if(buffer_capacity == 0){
784
int e = errno;
785
perror("incbuffer");
786
errno = e;
787
goto mandos_end;
788
}
789
790
if(quit_now){
791
errno = EINTR;
639
perror("adjustbuffer");
640
retval = -1;
792
641
goto mandos_end;
793
642
}
794
643
803
652
case GNUTLS_E_AGAIN:
804
653
break;
805
654
case GNUTLS_E_REHANDSHAKE:
806
do {
655
do{
807
656
ret = gnutls_handshake(session);
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
657
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
814
658
if(ret < 0){
815
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
816
660
gnutls_perror(ret);
817
errno = EPROTO;
661
retval = -1;
818
662
goto mandos_end;
819
663
}
820
664
break;
821
665
default:
822
666
fprintf(stderr, "Unknown error while reading data from"
823
667
" encrypted session with Mandos server\n");
668
retval = -1;
824
669
gnutls_bye(session, GNUTLS_SHUT_RDWR);
825
errno = EIO;
826
670
goto mandos_end;
827
671
}
828
672
} else {
834
678
fprintf(stderr, "Closing TLS session\n");
835
679
}
836
680
837
if(quit_now){
838
errno = EINTR;
839
goto mandos_end;
840
}
841
842
do {
843
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
849
682
850
683
if(buffer_length > 0){
851
ssize_t decrypted_buffer_size;
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
853
685
buffer_length,
854
686
&decrypted_buffer);
855
687
if(decrypted_buffer_size >= 0){
856
857
688
written = 0;
858
689
while(written < (size_t) decrypted_buffer_size){
859
if(quit_now){
860
errno = EINTR;
861
goto mandos_end;
862
}
863
864
690
ret = (int)fwrite(decrypted_buffer + written, 1,
865
691
(size_t)decrypted_buffer_size - written,
866
692
stdout);
867
693
if(ret == 0 and ferror(stdout)){
868
int e = errno;
869
694
if(debug){
870
695
fprintf(stderr, "Error writing encrypted data: %s\n",
871
696
strerror(errno));
872
697
}
873
errno = e;
874
goto mandos_end;
698
retval = -1;
699
break;
875
700
}
876
701
written += (size_t)ret;
877
702
}
878
retval = 0;
703
free(decrypted_buffer);
704
} else {
705
retval = -1;
879
706
}
707
} else {
708
retval = -1;
880
709
}
881
710
882
711
/* Shutdown procedure */
883
712
884
713
mandos_end:
885
{
886
int e = errno;
887
free(decrypted_buffer);
888
free(buffer);
889
if(tcp_sd >= 0){
890
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
891
}
892
if(ret == -1){
893
if(e == 0){
894
e = errno;
895
}
896
perror("close");
897
}
898
gnutls_deinit(session);
899
if(quit_now){
900
e = EINTR;
901
retval = -1;
902
}
903
errno = e;
714
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
904
718
}
719
gnutls_deinit(session);
905
720
return retval;
906
721
}
907
722
908
723
static void resolve_callback(AvahiSServiceResolver *r,
909
724
AvahiIfIndex interface,
910
AvahiProtocol proto,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
911
726
AvahiResolverEvent event,
912
727
const char *name,
913
728
const char *type,
918
733
AVAHI_GCC_UNUSED AvahiStringList *txt,
919
734
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
735
flags,
921
AVAHI_GCC_UNUSED void* userdata){
736
void* userdata) {
737
mandos_context *mc = userdata;
922
738
assert(r);
923
739
924
740
/* Called whenever a service has been resolved successfully or
925
741
timed out */
926
742
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
743
switch(event) {
932
744
default:
933
745
case AVAHI_RESOLVER_FAILURE:
934
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
747
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
748
avahi_strerror(avahi_server_errno(mc->server)));
937
749
break;
938
750
939
751
case AVAHI_RESOLVER_FOUND:
942
754
avahi_address_snprint(ip, sizeof(ip), address);
943
755
if(debug){
944
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
ip, (intmax_t)interface, port);
757
PRIu16 ") on port %d\n", name, host_name, ip,
758
interface, port);
947
759
}
948
int ret = start_mandos_communication(ip, port, interface,
949
avahi_proto_to_af(proto));
760
int ret = start_mandos_communication(ip, port, interface, mc);
950
761
if(ret == 0){
951
avahi_simple_poll_quit(mc.simple_poll);
762
avahi_simple_poll_quit(mc->simple_poll);
952
763
}
953
764
}
954
765
}
955
766
avahi_s_service_resolver_free(r);
956
767
}
957
768
958
static void browse_callback(AvahiSServiceBrowser *b,
959
AvahiIfIndex interface,
960
AvahiProtocol protocol,
961
AvahiBrowserEvent event,
962
const char *name,
963
const char *type,
964
const char *domain,
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
966
flags,
967
AVAHI_GCC_UNUSED void* userdata){
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
968
780
assert(b);
969
781
970
782
/* Called whenever a new services becomes available on the LAN or
971
783
is removed from the LAN */
972
784
973
if(quit_now){
974
return;
975
}
976
977
switch(event){
785
switch(event) {
978
786
default:
979
787
case AVAHI_BROWSER_FAILURE:
980
788
981
789
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
984
792
return;
985
793
986
794
case AVAHI_BROWSER_NEW:
989
797
the callback function is called the Avahi server will free the
990
798
resolver for us. */
991
799
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
995
804
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
805
name, avahi_strerror(avahi_server_errno(mc->server)));
997
806
break;
998
807
999
808
case AVAHI_BROWSER_REMOVE:
1008
817
}
1009
818
}
1010
819
1011
/* stop main loop after sigterm has been called */
1012
static void handle_sigterm(int sig){
1013
if(quit_now){
1014
return;
1015
}
1016
quit_now = 1;
1017
signal_received = sig;
1018
int old_errno = errno;
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1021
}
1022
errno = old_errno;
1023
}
1024
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1118
}
1119
1120
820
int main(int argc, char *argv[]){
1121
AvahiSServiceBrowser *sb = NULL;
1122
int error;
1123
int ret;
1124
intmax_t tmpmax;
1125
char *tmp;
1126
int exitcode = EXIT_SUCCESS;
1127
const char *interface = "";
1128
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
1131
uid_t uid;
1132
gid_t gid;
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1134
bool tempdir_created = false;
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1136
const char *seckey = PATHDIR "/" SECKEY;
1137
const char *pubkey = PATHDIR "/" PUBKEY;
1138
1139
bool gnutls_initialized = false;
1140
bool gpgme_initialized = false;
1141
float delay = 2.5f;
1142
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1145
1146
uid = getuid();
1147
gid = getgid();
1148
1149
/* Lower any group privileges we might have, just to be safe */
1150
errno = 0;
1151
ret = setgid(gid);
1152
if(ret == -1){
1153
perror("setgid");
1154
}
1155
1156
/* Lower user privileges (temporarily) */
1157
errno = 0;
1158
ret = seteuid(uid);
1159
if(ret == -1){
1160
perror("seteuid");
1161
}
1162
1163
if(quit_now){
1164
goto end;
1165
}
1166
1167
{
1168
struct argp_option options[] = {
1169
{ .name = "debug", .key = 128,
1170
.doc = "Debug mode", .group = 3 },
1171
{ .name = "connect", .key = 'c',
1172
.arg = "ADDRESS:PORT",
1173
.doc = "Connect directly to a specific Mandos server",
1174
.group = 1 },
1175
{ .name = "interface", .key = 'i',
1176
.arg = "NAME",
1177
.doc = "Network interface that will be used to search for"
1178
" Mandos servers",
1179
.group = 1 },
1180
{ .name = "seckey", .key = 's',
1181
.arg = "FILE",
1182
.doc = "OpenPGP secret key file base name",
1183
.group = 1 },
1184
{ .name = "pubkey", .key = 'p',
1185
.arg = "FILE",
1186
.doc = "OpenPGP public key file base name",
1187
.group = 2 },
1188
{ .name = "dh-bits", .key = 129,
1189
.arg = "BITS",
1190
.doc = "Bit length of the prime number used in the"
1191
" Diffie-Hellman key exchange",
1192
.group = 2 },
1193
{ .name = "priority", .key = 130,
1194
.arg = "STRING",
1195
.doc = "GnuTLS priority string for the TLS handshake",
1196
.group = 1 },
1197
{ .name = "delay", .key = 131,
1198
.arg = "SECONDS",
1199
.doc = "Maximum delay to wait for interface startup",
1200
.group = 2 },
1201
/*
1202
* These reproduce what we would get without ARGP_NO_HELP
1203
*/
1204
{ .name = "help", .key = '?',
1205
.doc = "Give this help list", .group = -1 },
1206
{ .name = "usage", .key = -3,
1207
.doc = "Give a short usage message", .group = -1 },
1208
{ .name = "version", .key = 'V',
1209
.doc = "Print program version", .group = -1 },
1210
{ .name = NULL }
1211
};
1212
1213
error_t parse_opt(int key, char *arg,
1214
struct argp_state *state){
1215
errno = 0;
1216
switch(key){
1217
case 128: /* --debug */
1218
debug = true;
1219
break;
1220
case 'c': /* --connect */
1221
connect_to = arg;
1222
break;
1223
case 'i': /* --interface */
1224
interface = arg;
1225
break;
1226
case 's': /* --seckey */
1227
seckey = arg;
1228
break;
1229
case 'p': /* --pubkey */
1230
pubkey = arg;
1231
break;
1232
case 129: /* --dh-bits */
1233
errno = 0;
1234
tmpmax = strtoimax(arg, &tmp, 10);
1235
if(errno != 0 or tmp == arg or *tmp != '\0'
1236
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1237
argp_error(state, "Bad number of DH bits");
1238
}
1239
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1240
break;
1241
case 130: /* --priority */
1242
mc.priority = arg;
1243
break;
1244
case 131: /* --delay */
1245
errno = 0;
1246
delay = strtof(arg, &tmp);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1248
argp_error(state, "Bad delay");
1249
}
1250
break;
1251
/*
1252
* These reproduce what we would get without ARGP_NO_HELP
1253
*/
1254
case '?': /* --help */
1255
argp_state_help(state, state->out_stream,
1256
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1257
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1258
case -3: /* --usage */
1259
argp_state_help(state, state->out_stream,
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1261
case 'V': /* --version */
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1263
exit(argp_err_exit_status);
1264
break;
1265
default:
1266
return ARGP_ERR_UNKNOWN;
1267
}
1268
return errno;
1269
}
1270
1271
struct argp argp = { .options = options, .parser = parse_opt,
1272
.args_doc = "",
1273
.doc = "Mandos client -- Get and decrypt"
1274
" passwords from a Mandos server" };
1275
ret = argp_parse(&argp, argc, argv,
1276
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1277
switch(ret){
1278
case 0:
1279
break;
1280
case ENOMEM:
1281
default:
1282
errno = ret;
1283
perror("argp_parse");
1284
exitcode = EX_OSERR;
1285
goto end;
1286
case EINVAL:
1287
exitcode = EX_USAGE;
1288
goto end;
1289
}
1290
}
1291
1292
if(not debug){
1293
avahi_set_log_function(empty_log);
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
1320
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1322
from the signal handler */
1323
/* Initialize the pseudo-RNG for Avahi */
1324
srand((unsigned int) time(NULL));
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1328
exitcode = EX_UNAVAILABLE;
1329
goto end;
1330
}
1331
1332
sigemptyset(&sigterm_action.sa_mask);
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1334
if(ret == -1){
1335
perror("sigaddset");
1336
exitcode = EX_OSERR;
1337
goto end;
1338
}
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1340
if(ret == -1){
1341
perror("sigaddset");
1342
exitcode = EX_OSERR;
1343
goto end;
1344
}
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1346
if(ret == -1){
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
/* Need to check if the handler is SIG_IGN before handling:
1352
| [[info:libc:Initial Signal Actions]] |
1353
| [[info:libc:Basic Signal Handling]] |
1354
*/
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1356
if(ret == -1){
1357
perror("sigaction");
1358
return EX_OSERR;
1359
}
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
1362
if(ret == -1){
1363
perror("sigaction");
1364
exitcode = EX_OSERR;
1365
goto end;
1366
}
1367
}
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1369
if(ret == -1){
1370
perror("sigaction");
1371
return EX_OSERR;
1372
}
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1375
if(ret == -1){
1376
perror("sigaction");
1377
exitcode = EX_OSERR;
1378
goto end;
1379
}
1380
}
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1382
if(ret == -1){
1383
perror("sigaction");
1384
return EX_OSERR;
1385
}
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1388
if(ret == -1){
1389
perror("sigaction");
1390
exitcode = EX_OSERR;
1391
goto end;
1392
}
1393
}
1394
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
int exitcode = EXIT_SUCCESS;
825
const char *interface = "eth0";
826
struct ifreq network;
827
int sd;
828
uid_t uid;
829
gid_t gid;
830
char *connect_to = NULL;
831
char tempdir[] = "/tmp/mandosXXXXXX";
832
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
833
const char *seckey = PATHDIR "/" SECKEY;
834
const char *pubkey = PATHDIR "/" PUBKEY;
835
836
mandos_context mc = { .simple_poll = NULL, .server = NULL,
837
.dh_bits = 1024, .priority = "SECURE256"
838
":!CTYPE-X.509:+CTYPE-OPENPGP" };
839
bool gnutls_initalized = false;
840
bool gpgme_initalized = false;
841
842
{
843
struct argp_option options[] = {
844
{ .name = "debug", .key = 128,
845
.doc = "Debug mode", .group = 3 },
846
{ .name = "connect", .key = 'c',
847
.arg = "ADDRESS:PORT",
848
.doc = "Connect directly to a specific Mandos server",
849
.group = 1 },
850
{ .name = "interface", .key = 'i',
851
.arg = "NAME",
852
.doc = "Interface that will be used to search for Mandos"
853
" servers",
854
.group = 1 },
855
{ .name = "seckey", .key = 's',
856
.arg = "FILE",
857
.doc = "OpenPGP secret key file base name",
858
.group = 1 },
859
{ .name = "pubkey", .key = 'p',
860
.arg = "FILE",
861
.doc = "OpenPGP public key file base name",
862
.group = 2 },
863
{ .name = "dh-bits", .key = 129,
864
.arg = "BITS",
865
.doc = "Bit length of the prime number used in the"
866
" Diffie-Hellman key exchange",
867
.group = 2 },
868
{ .name = "priority", .key = 130,
869
.arg = "STRING",
870
.doc = "GnuTLS priority string for the TLS handshake",
871
.group = 1 },
872
{ .name = NULL }
873
};
874
875
error_t parse_opt(int key, char *arg,
876
struct argp_state *state) {
877
switch(key) {
878
case 128: /* --debug */
879
debug = true;
880
break;
881
case 'c': /* --connect */
882
connect_to = arg;
883
break;
884
case 'i': /* --interface */
885
interface = arg;
886
break;
887
case 's': /* --seckey */
888
seckey = arg;
889
break;
890
case 'p': /* --pubkey */
891
pubkey = arg;
892
break;
893
case 129: /* --dh-bits */
894
ret = sscanf(arg, "%u", &mc.dh_bits);
895
if(ret != 1){
896
fprintf(stderr, "Bad number of DH bits\n");
897
exit(EXIT_FAILURE);
898
}
899
break;
900
case 130: /* --priority */
901
mc.priority = arg;
902
break;
903
case ARGP_KEY_ARG:
904
argp_usage(state);
905
case ARGP_KEY_END:
906
break;
907
default:
908
return ARGP_ERR_UNKNOWN;
909
}
910
return 0;
911
}
912
913
struct argp argp = { .options = options, .parser = parse_opt,
914
.args_doc = "",
915
.doc = "Mandos client -- Get and decrypt"
916
" passwords from a Mandos server" };
917
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
918
if(ret == ARGP_ERR_UNKNOWN){
919
fprintf(stderr, "Unknown error while parsing arguments\n");
920
exitcode = EXIT_FAILURE;
921
goto end;
922
}
923
}
924
925
/* If the interface is down, bring it up */
926
{
927
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
928
if(sd < 0) {
929
perror("socket");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
strcpy(network.ifr_name, interface);
934
ret = ioctl(sd, SIOCGIFFLAGS, &network);
935
if(ret == -1){
936
perror("ioctl SIOCGIFFLAGS");
937
exitcode = EXIT_FAILURE;
938
goto end;
939
}
940
if((network.ifr_flags & IFF_UP) == 0){
941
network.ifr_flags |= IFF_UP;
942
ret = ioctl(sd, SIOCSIFFLAGS, &network);
943
if(ret == -1){
944
perror("ioctl SIOCSIFFLAGS");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
}
949
ret = (int)TEMP_FAILURE_RETRY(close(sd));
950
if(ret == -1){
951
perror("close");
952
}
953
}
954
955
uid = getuid();
956
gid = getgid();
957
958
ret = setuid(uid);
959
if(ret == -1){
960
perror("setuid");
961
}
962
963
setgid(gid);
964
if(ret == -1){
965
perror("setgid");
966
}
967
968
ret = init_gnutls_global(&mc, pubkey, seckey);
969
if(ret == -1){
970
fprintf(stderr, "init_gnutls_global failed\n");
971
exitcode = EXIT_FAILURE;
972
goto end;
973
} else {
974
gnutls_initalized = true;
975
}
976
977
if(mkdtemp(tempdir) == NULL){
978
perror("mkdtemp");
979
tempdir[0] = '\0';
980
goto end;
981
}
982
983
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
984
fprintf(stderr, "gpgme_initalized failed\n");
985
exitcode = EXIT_FAILURE;
986
goto end;
987
} else {
988
gpgme_initalized = true;
989
}
990
1397
991
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
992
if(if_index == 0){
1399
993
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1415
#ifdef __linux__
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1420
if(ret == -1){
1421
restore_loglevel = false;
1422
perror("klogctl");
1423
}
1424
#endif /* __linux__ */
1425
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
1428
perror("socket");
1429
exitcode = EX_OSERR;
1430
#ifdef __linux__
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
goto end;
1445
}
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1450
#ifdef __linux__
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1465
goto end;
1466
}
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1475
#ifdef __linux__
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
}
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1498
break;
1499
}
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1504
}
1505
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1512
}
1513
#ifdef __linux__
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
} else {
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
1535
}
1536
}
1537
}
1538
1539
if(quit_now){
1540
goto end;
1541
}
1542
1543
ret = init_gnutls_global(pubkey, seckey);
1544
if(ret == -1){
1545
fprintf(stderr, "init_gnutls_global failed\n");
1546
exitcode = EX_UNAVAILABLE;
1547
goto end;
1548
} else {
1549
gnutls_initialized = true;
1550
}
1551
1552
if(quit_now){
1553
goto end;
1554
}
1555
1556
tempdir_created = true;
1557
if(mkdtemp(tempdir) == NULL){
1558
tempdir_created = false;
1559
perror("mkdtemp");
1560
goto end;
1561
}
1562
1563
if(quit_now){
1564
goto end;
1565
}
1566
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
} else {
1572
gpgme_initialized = true;
1573
}
1574
1575
if(quit_now){
1576
goto end;
1577
}
1578
1579
if(connect_to != NULL){
1580
/* Connect directly, do not use Zeroconf */
1581
/* (Mainly meant for debugging) */
1582
char *address = strrchr(connect_to, ':');
1583
if(address == NULL){
1584
fprintf(stderr, "No colon in address\n");
1585
exitcode = EX_USAGE;
1586
goto end;
1587
}
1588
1589
if(quit_now){
1590
goto end;
1591
}
1592
1593
uint16_t port;
1594
errno = 0;
1595
tmpmax = strtoimax(address+1, &tmp, 10);
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
1599
exitcode = EX_USAGE;
1600
goto end;
1601
}
1602
1603
if(quit_now){
1604
goto end;
1605
}
1606
1607
port = (uint16_t)tmpmax;
1608
*address = '\0';
1609
address = connect_to;
1610
/* Colon in address indicates IPv6 */
1611
int af;
1612
if(strchr(address, ':') != NULL){
1613
af = AF_INET6;
1614
} else {
1615
af = AF_INET;
1616
}
1617
1618
if(quit_now){
1619
goto end;
1620
}
1621
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
1644
exitcode = EXIT_SUCCESS;
1645
}
1646
goto end;
1647
}
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1653
{
1654
AvahiServerConfig config;
1655
/* Do not publish any local Zeroconf records */
1656
avahi_server_config_init(&config);
1657
config.publish_hinfo = 0;
1658
config.publish_addresses = 0;
1659
config.publish_workstation = 0;
1660
config.publish_domain = 0;
1661
1662
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
1666
1667
/* Free the Avahi configuration data */
1668
avahi_server_config_free(&config);
1669
}
1670
1671
/* Check if creating the Avahi server object succeeded */
1672
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1680
goto end;
1681
}
1682
1683
/* Create the Avahi service browser */
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1687
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1695
goto end;
1696
}
1697
1698
/* Run the main loop */
1699
1700
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
1705
994
exit(EXIT_FAILURE);
995
}
996
997
if(connect_to != NULL){
998
/* Connect directly, do not use Zeroconf */
999
/* (Mainly meant for debugging) */
1000
char *address = strrchr(connect_to, ':');
1001
if(address == NULL){
1002
fprintf(stderr, "No colon in address\n");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
uint16_t port;
1007
ret = sscanf(address+1, "%" SCNu16, &port);
1008
if(ret != 1){
1009
fprintf(stderr, "Bad port number\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
1013
*address = '\0';
1014
address = connect_to;
1015
ret = start_mandos_communication(address, port, if_index, &mc);
1016
if(ret < 0){
1017
exitcode = EXIT_FAILURE;
1018
} else {
1019
exitcode = EXIT_SUCCESS;
1020
}
1021
goto end;
1022
}
1023
1024
if(not debug){
1025
avahi_set_log_function(empty_log);
1026
}
1027
1028
/* Initialize the pseudo-RNG for Avahi */
1029
srand((unsigned int) time(NULL));
1030
1031
/* Allocate main Avahi loop object */
1032
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL) {
1034
fprintf(stderr, "Avahi: Failed to create simple poll"
1035
" object.\n");
1036
exitcode = EXIT_FAILURE;
1037
goto end;
1038
}
1039
1040
{
1041
AvahiServerConfig config;
1042
/* Do not publish any local Zeroconf records */
1043
avahi_server_config_init(&config);
1044
config.publish_hinfo = 0;
1045
config.publish_addresses = 0;
1046
config.publish_workstation = 0;
1047
config.publish_domain = 0;
1048
1049
/* Allocate a new server */
1050
mc.server = avahi_server_new(avahi_simple_poll_get
1051
(mc.simple_poll), &config, NULL,
1052
NULL, &error);
1053
1054
/* Free the Avahi configuration data */
1055
avahi_server_config_free(&config);
1056
}
1057
1058
/* Check if creating the Avahi server object succeeded */
1059
if(mc.server == NULL) {
1060
fprintf(stderr, "Failed to create Avahi server: %s\n",
1061
avahi_strerror(error));
1062
exitcode = EXIT_FAILURE;
1063
goto end;
1064
}
1065
1066
/* Create the Avahi service browser */
1067
sb = avahi_s_service_browser_new(mc.server, if_index,
1068
AVAHI_PROTO_INET6,
1069
"_mandos._tcp", NULL, 0,
1070
browse_callback, &mc);
1071
if(sb == NULL) {
1072
fprintf(stderr, "Failed to create service browser: %s\n",
1073
avahi_strerror(avahi_server_errno(mc.server)));
1074
exitcode = EXIT_FAILURE;
1075
goto end;
1076
}
1077
1078
/* Run the main loop */
1079
1080
if(debug){
1081
fprintf(stderr, "Starting Avahi loop search\n");
1082
}
1083
1084
avahi_simple_poll_loop(mc.simple_poll);
1085
1706
1086
end:
1707
1708
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
1710
}
1711
1712
/* Cleanup things */
1713
if(sb != NULL)
1714
avahi_s_service_browser_free(sb);
1715
1716
if(mc.server != NULL)
1717
avahi_server_free(mc.server);
1718
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
1721
1722
if(gnutls_initialized){
1723
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
1725
gnutls_dh_params_deinit(mc.dh_params);
1726
}
1727
1728
if(gpgme_initialized){
1729
gpgme_release(mc.ctx);
1730
}
1731
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
1739
}
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1749
}
1750
}
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
1805
}
1806
}
1807
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1827
return exitcode;
1087
1088
if(debug){
1089
fprintf(stderr, "%s exiting\n", argv[0]);
1090
}
1091
1092
/* Cleanup things */
1093
if(sb != NULL)
1094
avahi_s_service_browser_free(sb);
1095
1096
if(mc.server != NULL)
1097
avahi_server_free(mc.server);
1098
1099
if(mc.simple_poll != NULL)
1100
avahi_simple_poll_free(mc.simple_poll);
1101
1102
if(gnutls_initalized){
1103
gnutls_certificate_free_credentials(mc.cred);
1104
gnutls_global_deinit();
1105
gnutls_dh_params_deinit(mc.dh_params);
1106
}
1107
1108
if(gpgme_initalized){
1109
gpgme_release(mc.ctx);
1110
}
1111
1112
/* Removes the temp directory used by GPGME */
1113
if(tempdir[0] != '\0'){
1114
DIR *d;
1115
struct dirent *direntry;
1116
d = opendir(tempdir);
1117
if(d == NULL){
1118
if(errno != ENOENT){
1119
perror("opendir");
1120
}
1121
} else {
1122
while(true){
1123
direntry = readdir(d);
1124
if(direntry == NULL){
1125
break;
1126
}
1127
if(direntry->d_type == DT_REG){
1128
char *fullname = NULL;
1129
ret = asprintf(&fullname, "%s/%s", tempdir,
1130
direntry->d_name);
1131
if(ret < 0){
1132
perror("asprintf");
1133
continue;
1134
}
1135
ret = unlink(fullname);
1136
if(ret == -1){
1137
fprintf(stderr, "unlink(\"%s\"): %s",
1138
fullname, strerror(errno));
1139
}
1140
free(fullname);
1141
}
1142
}
1143
closedir(d);
1144
}
1145
ret = rmdir(tempdir);
1146
if(ret == -1 and errno != ENOENT){
1147
perror("rmdir");
1148
}
1149
}
1150
1151
return exitcode;
1828
1152
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0