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- Committer: teddy at bsnet
- Date: 2011-07-31 13:05:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20110731130534-v4d9hsvek80ms9uo
* plugins.d/mandos-client.c (avahi_loop_with_timeout): Fix warning.
(main): Disallow "--retry" arguments < 0. Allow brackets [] around
IPv6 addresses, as recommended by RFC 5952. Bug fix: When
using --connect, really use retry_interval, not 1 second.
* plugins.d/mandos-client.xml (DESCRIPTION): Add retry info.
(--retry): Remove repeated word.
(main): Disallow "--retry" arguments < 0. Allow brackets [] around
IPv6 addresses, as recommended by RFC 5952. Bug fix: When
using --connect, really use retry_interval, not 1 second.
* plugins.d/mandos-client.xml (DESCRIPTION): Add retry info.
(--retry): Remove repeated word.
- files added:
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
70
if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
78
89
#ifdef __linux__
79
90
#include <sys/klog.h> /* klogctl() */
80
#endif
91
#endif /* __linux__ */
81
92
82
93
/* Avahi */
83
94
/* All Avahi types, constants and functions
117
128
static const char mandos_protocol_version[] = "1";
118
129
const char *argp_program_version = "mandos-client " VERSION;
119
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
120
144
121
145
/* Used for passing in values through the Avahi callback functions */
122
146
typedef struct {
127
151
gnutls_dh_params_t dh_params;
128
152
const char *priority;
129
153
gpgme_ctx_t ctx;
154
server *current_server;
130
155
} mandos_context;
131
156
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
132
173
/*
133
* Make additional room in "buffer" for at least BUFFER_SIZE
134
* additional bytes. "buffer_capacity" is how much is currently
135
* allocated, "buffer_length" is how much is already used.
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
176
* "buffer_length" is how much is already used.
136
177
*/
137
178
size_t incbuffer(char **buffer, size_t buffer_length,
138
179
size_t buffer_capacity){
146
187
return buffer_capacity;
147
188
}
148
189
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
149
228
/*
150
229
* Initialize GPGME.
151
230
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
231
static bool init_gpgme(const char *seckey,
153
232
const char *pubkey, const char *tempdir){
154
int ret;
155
233
gpgme_error_t rc;
156
234
gpgme_engine_info_t engine_info;
157
235
160
238
* Helper function to insert pub and seckey to the engine keyring.
161
239
*/
162
240
bool import_key(const char *filename){
241
int ret;
163
242
int fd;
164
243
gpgme_data_t pgp_data;
165
244
166
245
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
246
if(fd == -1){
168
perror("open");
247
perror_plus("open");
169
248
return false;
170
249
}
171
250
176
255
return false;
177
256
}
178
257
179
rc = gpgme_op_import(mc->ctx, pgp_data);
258
rc = gpgme_op_import(mc.ctx, pgp_data);
180
259
if(rc != GPG_ERR_NO_ERROR){
181
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
261
gpgme_strsource(rc), gpgme_strerror(rc));
185
264
186
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
266
if(ret == -1){
188
perror("close");
267
perror_plus("close");
189
268
}
190
269
gpgme_data_release(pgp_data);
191
270
return true;
192
271
}
193
272
194
273
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
274
fprintf(stderr, "Initializing GPGME\n");
196
275
}
197
276
198
277
/* Init GPGME */
225
304
}
226
305
227
306
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
307
rc = gpgme_new(&(mc.ctx));
229
308
if(rc != GPG_ERR_NO_ERROR){
230
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
310
gpgme_strsource(rc), gpgme_strerror(rc));
236
315
return false;
237
316
}
238
317
239
return true;
318
return true;
240
319
}
241
320
242
321
/*
243
322
* Decrypt OpenPGP data.
244
323
* Returns -1 on error
245
324
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
326
size_t crypto_size,
249
327
char **plaintext){
250
328
gpgme_data_t dh_crypto, dh_plain;
277
355
278
356
/* Decrypt data from the cryptotext data buffer to the plaintext
279
357
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
359
if(rc != GPG_ERR_NO_ERROR){
282
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
361
gpgme_strsource(rc), gpgme_strerror(rc));
284
362
plaintext_length = -1;
285
363
if(debug){
286
364
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
365
result = gpgme_op_decrypt_result(mc.ctx);
288
366
if(result == NULL){
289
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
290
368
} else {
297
375
}
298
376
gpgme_recipient_t recipient;
299
377
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
378
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
385
recipient = recipient->next;
310
386
}
311
387
}
312
388
}
319
395
320
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
397
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
398
perror_plus("gpgme_data_seek");
323
399
plaintext_length = -1;
324
400
goto decrypt_end;
325
401
}
330
406
(size_t)plaintext_length,
331
407
plaintext_capacity);
332
408
if(plaintext_capacity == 0){
333
perror("incbuffer");
409
perror_plus("incbuffer");
334
410
plaintext_length = -1;
335
411
goto decrypt_end;
336
412
}
343
419
break;
344
420
}
345
421
if(ret < 0){
346
perror("gpgme_data_read");
422
perror_plus("gpgme_data_read");
347
423
plaintext_length = -1;
348
424
goto decrypt_end;
349
425
}
382
458
fprintf(stderr, "GnuTLS: %s", string);
383
459
}
384
460
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
461
static int init_gnutls_global(const char *pubkeyfilename,
387
462
const char *seckeyfilename){
388
463
int ret;
389
464
407
482
}
408
483
409
484
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
486
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
487
fprintf(stderr, "GnuTLS memory error: %s\n",
416
488
safer_gnutls_strerror(ret));
417
489
gnutls_global_deinit();
418
490
return -1;
425
497
}
426
498
427
499
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
500
(mc.cred, pubkeyfilename, seckeyfilename,
429
501
GNUTLS_OPENPGP_FMT_BASE64);
430
502
if(ret != GNUTLS_E_SUCCESS){
431
503
fprintf(stderr,
437
509
}
438
510
439
511
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
512
ret = gnutls_dh_params_init(&mc.dh_params);
441
513
if(ret != GNUTLS_E_SUCCESS){
442
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
515
" %s\n", safer_gnutls_strerror(ret));
444
516
goto globalfail;
445
517
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
519
if(ret != GNUTLS_E_SUCCESS){
448
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
521
safer_gnutls_strerror(ret));
450
522
goto globalfail;
451
523
}
452
524
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
526
455
527
return 0;
456
528
457
529
globalfail:
458
530
459
gnutls_certificate_free_credentials(mc->cred);
531
gnutls_certificate_free_credentials(mc.cred);
460
532
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
533
gnutls_dh_params_deinit(mc.dh_params);
462
534
return -1;
463
535
}
464
536
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
537
static int init_gnutls_session(gnutls_session_t *session){
467
538
int ret;
468
539
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
540
do {
541
ret = gnutls_init(session, GNUTLS_SERVER);
542
if(quit_now){
543
return -1;
544
}
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
546
if(ret != GNUTLS_E_SUCCESS){
471
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
548
safer_gnutls_strerror(ret));
474
550
475
551
{
476
552
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
555
if(quit_now){
556
gnutls_deinit(*session);
557
return -1;
558
}
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
560
if(ret != GNUTLS_E_SUCCESS){
479
561
fprintf(stderr, "Syntax error at: %s\n", err);
480
562
fprintf(stderr, "GnuTLS error: %s\n",
484
566
}
485
567
}
486
568
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
569
do {
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
572
if(quit_now){
573
gnutls_deinit(*session);
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
577
if(ret != GNUTLS_E_SUCCESS){
490
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
579
safer_gnutls_strerror(ret));
494
582
}
495
583
496
584
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
586
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
588
502
589
return 0;
503
590
}
509
596
/* Called when a Mandos server is found */
510
597
static int start_mandos_communication(const char *ip, uint16_t port,
511
598
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
599
int af){
600
int ret, tcp_sd = -1;
514
601
ssize_t sret;
515
602
union {
516
603
struct sockaddr_in in;
517
604
struct sockaddr_in6 in6;
518
605
} to;
519
606
char *buffer = NULL;
520
char *decrypted_buffer;
607
char *decrypted_buffer = NULL;
521
608
size_t buffer_length = 0;
522
609
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
524
610
size_t written;
525
int retval = 0;
611
int retval = -1;
526
612
gnutls_session_t session;
527
613
int pf; /* Protocol family */
528
614
615
errno = 0;
616
617
if(quit_now){
618
errno = EINTR;
619
return -1;
620
}
621
529
622
switch(af){
530
623
case AF_INET6:
531
624
pf = PF_INET6;
535
628
break;
536
629
default:
537
630
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
538
632
return -1;
539
633
}
540
634
541
ret = init_gnutls_session(mc, &session);
635
ret = init_gnutls_session(&session);
542
636
if(ret != 0){
543
637
return -1;
544
638
}
550
644
551
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
646
if(tcp_sd < 0){
553
perror("socket");
554
return -1;
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
650
goto mandos_end;
651
}
652
653
if(quit_now){
654
errno = EINTR;
655
goto mandos_end;
555
656
}
556
657
557
658
memset(&to, 0, sizeof(to));
558
659
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
660
to.in6.sin6_family = (sa_family_t)af;
560
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
662
} else { /* IPv4 */
562
663
to.in.sin_family = (sa_family_t)af;
563
664
ret = inet_pton(af, ip, &to.in.sin_addr);
564
665
}
565
666
if(ret < 0 ){
566
perror("inet_pton");
567
return -1;
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
670
goto mandos_end;
568
671
}
569
672
if(ret == 0){
673
int e = errno;
570
674
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
675
errno = e;
676
goto mandos_end;
572
677
}
573
678
if(af == AF_INET6){
574
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
686
if(if_index == AVAHI_IF_UNSPEC){
582
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
688
" without a network interface\n");
584
return -1;
689
errno = EINVAL;
690
goto mandos_end;
585
691
}
586
692
/* Set the network interface number as scope */
587
693
to.in6.sin6_scope_id = (uint32_t)if_index;
592
698
-Wunreachable-code */
593
699
}
594
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
705
595
706
if(debug){
596
707
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
708
char interface[IF_NAMESIZE];
598
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
599
perror("if_indextoname");
710
perror_plus("if_indextoname");
600
711
} else {
601
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
713
ip, interface, port);
616
727
sizeof(addrstr));
617
728
}
618
729
if(pcret == NULL){
619
perror("inet_ntop");
730
perror_plus("inet_ntop");
620
731
} else {
621
732
if(strcmp(addrstr, ip) != 0){
622
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
624
735
}
625
736
}
626
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
627
743
if(af == AF_INET6){
628
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
745
} else {
630
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
747
}
632
748
if(ret < 0){
633
perror("connect");
634
return -1;
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
635
760
}
636
761
637
762
const char *out = mandos_protocol_version;
641
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
642
767
out_size - written));
643
768
if(ret == -1){
644
perror("write");
645
retval = -1;
769
int e = errno;
770
perror_plus("write");
771
errno = e;
646
772
goto mandos_end;
647
773
}
648
774
written += (size_t)ret;
656
782
break;
657
783
}
658
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
659
790
}
660
791
661
792
if(debug){
662
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
794
}
664
795
796
if(quit_now){
797
errno = EINTR;
798
goto mandos_end;
799
}
800
801
/* Spurious warning from -Wint-to-pointer-cast */
665
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
803
667
do{
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
do {
668
810
ret = gnutls_handshake(session);
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
669
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
816
671
817
if(ret != GNUTLS_E_SUCCESS){
673
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
674
820
gnutls_perror(ret);
675
821
}
676
retval = -1;
822
errno = EPROTO;
677
823
goto mandos_end;
678
824
}
679
825
685
831
}
686
832
687
833
while(true){
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
688
840
buffer_capacity = incbuffer(&buffer, buffer_length,
689
841
buffer_capacity);
690
842
if(buffer_capacity == 0){
691
perror("incbuffer");
692
retval = -1;
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
846
goto mandos_end;
847
}
848
849
if(quit_now){
850
errno = EINTR;
693
851
goto mandos_end;
694
852
}
695
853
704
862
case GNUTLS_E_AGAIN:
705
863
break;
706
864
case GNUTLS_E_REHANDSHAKE:
707
do{
865
do {
708
866
ret = gnutls_handshake(session);
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
709
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
873
if(ret < 0){
711
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
712
875
gnutls_perror(ret);
713
retval = -1;
876
errno = EPROTO;
714
877
goto mandos_end;
715
878
}
716
879
break;
717
880
default:
718
881
fprintf(stderr, "Unknown error while reading data from"
719
882
" encrypted session with Mandos server\n");
720
retval = -1;
721
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
722
885
goto mandos_end;
723
886
}
724
887
} else {
730
893
fprintf(stderr, "Closing TLS session\n");
731
894
}
732
895
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
901
do {
902
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
908
735
909
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
910
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
737
912
buffer_length,
738
913
&decrypted_buffer);
739
914
if(decrypted_buffer_size >= 0){
915
740
916
written = 0;
741
917
while(written < (size_t) decrypted_buffer_size){
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
742
923
ret = (int)fwrite(decrypted_buffer + written, 1,
743
924
(size_t)decrypted_buffer_size - written,
744
925
stdout);
745
926
if(ret == 0 and ferror(stdout)){
927
int e = errno;
746
928
if(debug){
747
929
fprintf(stderr, "Error writing encrypted data: %s\n",
748
930
strerror(errno));
749
931
}
750
retval = -1;
751
break;
932
errno = e;
933
goto mandos_end;
752
934
}
753
935
written += (size_t)ret;
754
936
}
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
937
retval = 0;
758
938
}
759
} else {
760
retval = -1;
761
939
}
762
940
763
941
/* Shutdown procedure */
764
942
765
943
mandos_end:
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
944
{
945
int e = errno;
946
free(decrypted_buffer);
947
free(buffer);
948
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
950
}
951
if(ret == -1){
952
if(e == 0){
953
e = errno;
954
}
955
perror_plus("close");
956
}
957
gnutls_deinit(session);
958
errno = e;
959
if(quit_now){
960
errno = EINTR;
961
retval = -1;
962
}
770
963
}
771
gnutls_deinit(session);
772
964
return retval;
773
965
}
774
966
785
977
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
978
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
979
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
980
AVAHI_GCC_UNUSED void* userdata){
790
981
assert(r);
791
982
792
983
/* Called whenever a service has been resolved successfully or
793
984
timed out */
794
985
986
if(quit_now){
987
return;
988
}
989
795
990
switch(event){
796
991
default:
797
992
case AVAHI_RESOLVER_FAILURE:
798
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
995
avahi_strerror(avahi_server_errno(mc.server)));
801
996
break;
802
997
803
998
case AVAHI_RESOLVER_FOUND:
809
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
1005
ip, (intmax_t)interface, port);
811
1006
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
1007
int ret = start_mandos_communication(ip, port, interface,
813
1008
avahi_proto_to_af(proto));
814
1009
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
816
1014
}
817
1015
}
818
1016
}
828
1026
const char *domain,
829
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
1028
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
1029
AVAHI_GCC_UNUSED void* userdata){
833
1030
assert(b);
834
1031
835
1032
/* Called whenever a new services becomes available on the LAN or
836
1033
is removed from the LAN */
837
1034
1035
if(quit_now){
1036
return;
1037
}
1038
838
1039
switch(event){
839
1040
default:
840
1041
case AVAHI_BROWSER_FAILURE:
841
1042
842
1043
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
845
1046
return;
846
1047
847
1048
case AVAHI_BROWSER_NEW:
850
1051
the callback function is called the Avahi server will free the
851
1052
resolver for us. */
852
1053
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
857
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
859
1059
break;
860
1060
861
1061
case AVAHI_BROWSER_REMOVE:
870
1070
}
871
1071
}
872
1072
1073
/* Signal handler that stops main loop after SIGTERM */
1074
static void handle_sigterm(int sig){
1075
if(quit_now){
1076
return;
1077
}
1078
quit_now = 1;
1079
signal_received = sig;
1080
int old_errno = errno;
1081
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1084
}
1085
errno = old_errno;
1086
}
1087
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1189
}
1190
return 1;
1191
}
1192
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
1274
873
1275
int main(int argc, char *argv[]){
874
1276
AvahiSServiceBrowser *sb = NULL;
875
1277
int error;
876
1278
int ret;
877
1279
intmax_t tmpmax;
878
int numchars;
1280
char *tmp;
879
1281
int exitcode = EXIT_SUCCESS;
880
const char *interface = "eth0";
1282
const char *interface = "";
881
1283
struct ifreq network;
882
int sd;
1284
int sd = -1;
1285
bool take_down_interface = false;
883
1286
uid_t uid;
884
1287
gid_t gid;
885
char *connect_to = NULL;
886
1288
char tempdir[] = "/tmp/mandosXXXXXX";
887
1289
bool tempdir_created = false;
888
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
889
1291
const char *seckey = PATHDIR "/" SECKEY;
890
1292
const char *pubkey = PATHDIR "/" PUBKEY;
891
1293
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
1294
bool gnutls_initialized = false;
896
1295
bool gpgme_initialized = false;
897
double delay = 2.5;
1296
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
1300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1301
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1302
1303
uid = getuid();
1304
gid = getgid();
1305
1306
/* Lower any group privileges we might have, just to be safe */
1307
errno = 0;
1308
ret = setgid(gid);
1309
if(ret == -1){
1310
perror_plus("setgid");
1311
}
1312
1313
/* Lower user privileges (temporarily) */
1314
errno = 0;
1315
ret = seteuid(uid);
1316
if(ret == -1){
1317
perror_plus("seteuid");
1318
}
1319
1320
if(quit_now){
1321
goto end;
1322
}
898
1323
899
1324
{
900
1325
struct argp_option options[] = {
930
1355
.arg = "SECONDS",
931
1356
.doc = "Maximum delay to wait for interface startup",
932
1357
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1362
/*
1363
* These reproduce what we would get without ARGP_NO_HELP
1364
*/
1365
{ .name = "help", .key = '?',
1366
.doc = "Give this help list", .group = -1 },
1367
{ .name = "usage", .key = -3,
1368
.doc = "Give a short usage message", .group = -1 },
1369
{ .name = "version", .key = 'V',
1370
.doc = "Print program version", .group = -1 },
933
1371
{ .name = NULL }
934
1372
};
935
1373
936
1374
error_t parse_opt(int key, char *arg,
937
1375
struct argp_state *state){
1376
errno = 0;
938
1377
switch(key){
939
1378
case 128: /* --debug */
940
1379
debug = true;
952
1391
pubkey = arg;
953
1392
break;
954
1393
case 129: /* --dh-bits */
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1394
errno = 0;
1395
tmpmax = strtoimax(arg, &tmp, 10);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'
1397
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1398
argp_error(state, "Bad number of DH bits");
960
1399
}
961
1400
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
962
1401
break;
964
1403
mc.priority = arg;
965
1404
break;
966
1405
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
1406
errno = 0;
1407
delay = strtof(arg, &tmp);
1408
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
argp_error(state, "Bad delay");
1410
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
971
1418
}
972
1419
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1420
/*
1421
* These reproduce what we would get without ARGP_NO_HELP
1422
*/
1423
case '?': /* --help */
1424
argp_state_help(state, state->out_stream,
1425
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1426
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1427
case -3: /* --usage */
1428
argp_state_help(state, state->out_stream,
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1432
exit(argp_err_exit_status);
976
1433
break;
977
1434
default:
978
1435
return ARGP_ERR_UNKNOWN;
979
1436
}
980
return 0;
1437
return errno;
981
1438
}
982
1439
983
1440
struct argp argp = { .options = options, .parser = parse_opt,
984
1441
.args_doc = "",
985
1442
.doc = "Mandos client -- Get and decrypt"
986
1443
" passwords from a Mandos server" };
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
1444
ret = argp_parse(&argp, argc, argv,
1445
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1446
switch(ret){
1447
case 0:
1448
break;
1449
case ENOMEM:
1450
default:
1451
errno = ret;
1452
perror_plus("argp_parse");
1453
exitcode = EX_OSERR;
1454
goto end;
1455
case EINVAL:
1456
exitcode = EX_USAGE;
1457
goto end;
1458
}
1459
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1474
if(seckey_fd == -1){
1475
perror_plus("open");
1476
} else {
1477
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1478
if(ret == -1){
1479
perror_plus("fstat");
1480
} else {
1481
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1482
ret = fchown(seckey_fd, uid, gid);
1483
if(ret == -1){
1484
perror_plus("fchown");
1485
}
1486
}
1487
}
1488
TEMP_FAILURE_RETRY(close(seckey_fd));
1489
}
1490
1491
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1492
if(pubkey_fd == -1){
1493
perror_plus("open");
1494
} else {
1495
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1496
if(ret == -1){
1497
perror_plus("fstat");
1498
} else {
1499
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1500
ret = fchown(pubkey_fd, uid, gid);
1501
if(ret == -1){
1502
perror_plus("fchown");
1503
}
1504
}
1505
}
1506
TEMP_FAILURE_RETRY(close(pubkey_fd));
1507
}
1508
1509
/* Lower privileges */
1510
errno = 0;
1511
ret = seteuid(uid);
1512
if(ret == -1){
1513
perror_plus("seteuid");
1514
}
1515
}
1516
1517
if(not debug){
1518
avahi_set_log_function(empty_log);
1519
}
1520
1521
if(interface[0] == '\0'){
1522
struct dirent **direntries;
1523
ret = scandir(sys_class_net, &direntries, good_interface,
1524
alphasort);
1525
if(ret >= 1){
1526
/* Pick the first good interface */
1527
interface = strdup(direntries[0]->d_name);
1528
if(debug){
1529
fprintf(stderr, "Using interface \"%s\"\n", interface);
1530
}
1531
if(interface == NULL){
1532
perror_plus("malloc");
1533
free(direntries);
1534
exitcode = EXIT_FAILURE;
1535
goto end;
1536
}
1537
free(direntries);
1538
} else {
1539
free(direntries);
1540
fprintf(stderr, "Could not find a network interface\n");
990
1541
exitcode = EXIT_FAILURE;
991
1542
goto end;
992
1543
}
993
1544
}
994
1545
1546
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1547
from the signal handler */
1548
/* Initialize the pseudo-RNG for Avahi */
1549
srand((unsigned int) time(NULL));
1550
mc.simple_poll = avahi_simple_poll_new();
1551
if(mc.simple_poll == NULL){
1552
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1553
exitcode = EX_UNAVAILABLE;
1554
goto end;
1555
}
1556
1557
sigemptyset(&sigterm_action.sa_mask);
1558
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1559
if(ret == -1){
1560
perror_plus("sigaddset");
1561
exitcode = EX_OSERR;
1562
goto end;
1563
}
1564
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1565
if(ret == -1){
1566
perror_plus("sigaddset");
1567
exitcode = EX_OSERR;
1568
goto end;
1569
}
1570
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1571
if(ret == -1){
1572
perror_plus("sigaddset");
1573
exitcode = EX_OSERR;
1574
goto end;
1575
}
1576
/* Need to check if the handler is SIG_IGN before handling:
1577
| [[info:libc:Initial Signal Actions]] |
1578
| [[info:libc:Basic Signal Handling]] |
1579
*/
1580
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1581
if(ret == -1){
1582
perror_plus("sigaction");
1583
return EX_OSERR;
1584
}
1585
if(old_sigterm_action.sa_handler != SIG_IGN){
1586
ret = sigaction(SIGINT, &sigterm_action, NULL);
1587
if(ret == -1){
1588
perror_plus("sigaction");
1589
exitcode = EX_OSERR;
1590
goto end;
1591
}
1592
}
1593
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1594
if(ret == -1){
1595
perror_plus("sigaction");
1596
return EX_OSERR;
1597
}
1598
if(old_sigterm_action.sa_handler != SIG_IGN){
1599
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1600
if(ret == -1){
1601
perror_plus("sigaction");
1602
exitcode = EX_OSERR;
1603
goto end;
1604
}
1605
}
1606
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1607
if(ret == -1){
1608
perror_plus("sigaction");
1609
return EX_OSERR;
1610
}
1611
if(old_sigterm_action.sa_handler != SIG_IGN){
1612
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1613
if(ret == -1){
1614
perror_plus("sigaction");
1615
exitcode = EX_OSERR;
1616
goto end;
1617
}
1618
}
1619
995
1620
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
1621
if(strcmp(interface, "none") != 0){
1622
if_index = (AvahiIfIndex) if_nametoindex(interface);
1623
if(if_index == 0){
1624
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1625
exitcode = EX_UNAVAILABLE;
1626
goto end;
1627
}
1628
1629
if(quit_now){
1630
goto end;
1631
}
1632
1633
/* Re-raise priviliges */
1634
errno = 0;
1635
ret = seteuid(0);
1636
if(ret == -1){
1637
perror_plus("seteuid");
1638
}
1639
997
1640
#ifdef __linux__
998
1641
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1642
messages about the network interface to mess up the prompt */
1000
1643
ret = klogctl(8, NULL, 5);
1001
1644
bool restore_loglevel = true;
1002
1645
if(ret == -1){
1003
1646
restore_loglevel = false;
1004
perror("klogctl");
1647
perror_plus("klogctl");
1005
1648
}
1006
#endif
1649
#endif /* __linux__ */
1007
1650
1008
1651
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
1652
if(sd < 0){
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1653
perror_plus("socket");
1654
exitcode = EX_OSERR;
1012
1655
#ifdef __linux__
1013
1656
if(restore_loglevel){
1014
1657
ret = klogctl(7, NULL, 0);
1015
1658
if(ret == -1){
1016
perror("klogctl");
1659
perror_plus("klogctl");
1017
1660
}
1018
1661
}
1019
#endif
1662
#endif /* __linux__ */
1663
/* Lower privileges */
1664
errno = 0;
1665
ret = seteuid(uid);
1666
if(ret == -1){
1667
perror_plus("seteuid");
1668
}
1020
1669
goto end;
1021
1670
}
1022
1671
strcpy(network.ifr_name, interface);
1023
1672
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1024
1673
if(ret == -1){
1025
perror("ioctl SIOCGIFFLAGS");
1674
perror_plus("ioctl SIOCGIFFLAGS");
1026
1675
#ifdef __linux__
1027
1676
if(restore_loglevel){
1028
1677
ret = klogctl(7, NULL, 0);
1029
1678
if(ret == -1){
1030
perror("klogctl");
1679
perror_plus("klogctl");
1031
1680
}
1032
1681
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1682
#endif /* __linux__ */
1683
exitcode = EX_OSERR;
1684
/* Lower privileges */
1685
errno = 0;
1686
ret = seteuid(uid);
1687
if(ret == -1){
1688
perror_plus("seteuid");
1689
}
1035
1690
goto end;
1036
1691
}
1037
1692
if((network.ifr_flags & IFF_UP) == 0){
1038
1693
network.ifr_flags |= IFF_UP;
1694
take_down_interface = true;
1039
1695
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
1696
if(ret == -1){
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1697
take_down_interface = false;
1698
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1699
exitcode = EX_OSERR;
1043
1700
#ifdef __linux__
1044
1701
if(restore_loglevel){
1045
1702
ret = klogctl(7, NULL, 0);
1046
1703
if(ret == -1){
1047
perror("klogctl");
1704
perror_plus("klogctl");
1048
1705
}
1049
1706
}
1050
#endif
1707
#endif /* __linux__ */
1708
/* Lower privileges */
1709
errno = 0;
1710
ret = seteuid(uid);
1711
if(ret == -1){
1712
perror_plus("seteuid");
1713
}
1051
1714
goto end;
1052
1715
}
1053
1716
}
1054
/* sleep checking until interface is running */
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1055
1719
for(int i=0; i < delay * 4; i++){
1056
1720
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1057
1721
if(ret == -1){
1058
perror("ioctl SIOCGIFFLAGS");
1722
perror_plus("ioctl SIOCGIFFLAGS");
1059
1723
} else if(network.ifr_flags & IFF_RUNNING){
1060
1724
break;
1061
1725
}
1062
1726
struct timespec sleeptime = { .tv_nsec = 250000000 };
1063
1727
ret = nanosleep(&sleeptime, NULL);
1064
1728
if(ret == -1 and errno != EINTR){
1065
perror("nanosleep");
1729
perror_plus("nanosleep");
1066
1730
}
1067
1731
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1732
if(not take_down_interface){
1733
/* We won't need the socket anymore */
1734
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1735
if(ret == -1){
1736
perror_plus("close");
1737
}
1071
1738
}
1072
1739
#ifdef __linux__
1073
1740
if(restore_loglevel){
1074
1741
/* Restores kernel loglevel to default */
1075
1742
ret = klogctl(7, NULL, 0);
1076
1743
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1744
perror_plus("klogctl");
1745
}
1746
}
1747
#endif /* __linux__ */
1748
/* Lower privileges */
1749
errno = 0;
1750
if(take_down_interface){
1751
/* Lower privileges */
1752
ret = seteuid(uid);
1753
if(ret == -1){
1754
perror_plus("seteuid");
1755
}
1756
} else {
1757
/* Lower privileges permanently */
1758
ret = setuid(uid);
1759
if(ret == -1){
1760
perror_plus("setuid");
1761
}
1762
}
1763
}
1764
1765
if(quit_now){
1766
goto end;
1767
}
1768
1769
ret = init_gnutls_global(pubkey, seckey);
1098
1770
if(ret == -1){
1099
1771
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1772
exitcode = EX_UNAVAILABLE;
1101
1773
goto end;
1102
1774
} else {
1103
1775
gnutls_initialized = true;
1104
1776
}
1105
1777
1778
if(quit_now){
1779
goto end;
1780
}
1781
1106
1782
if(mkdtemp(tempdir) == NULL){
1107
perror("mkdtemp");
1783
perror_plus("mkdtemp");
1108
1784
goto end;
1109
1785
}
1110
1786
tempdir_created = true;
1111
1787
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1788
if(quit_now){
1789
goto end;
1790
}
1791
1792
if(not init_gpgme(pubkey, seckey, tempdir)){
1113
1793
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
1794
exitcode = EX_UNAVAILABLE;
1115
1795
goto end;
1116
1796
} else {
1117
1797
gpgme_initialized = true;
1118
1798
}
1119
1799
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1800
if(quit_now){
1801
goto end;
1127
1802
}
1128
1803
1129
1804
if(connect_to != NULL){
1132
1807
char *address = strrchr(connect_to, ':');
1133
1808
if(address == NULL){
1134
1809
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1810
exitcode = EX_USAGE;
1811
goto end;
1812
}
1813
1814
if(quit_now){
1815
goto end;
1816
}
1817
1138
1818
uint16_t port;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1819
errno = 0;
1820
tmpmax = strtoimax(address+1, &tmp, 10);
1821
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1822
or tmpmax != (uint16_t)tmpmax){
1142
1823
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1824
exitcode = EX_USAGE;
1825
goto end;
1826
}
1827
1828
if(quit_now){
1829
goto end;
1830
}
1831
1146
1832
port = (uint16_t)tmpmax;
1147
1833
*address = '\0';
1148
address = connect_to;
1149
1834
/* Colon in address indicates IPv6 */
1150
1835
int af;
1151
if(strchr(address, ':') != NULL){
1836
if(strchr(connect_to, ':') != NULL){
1152
1837
af = AF_INET6;
1838
/* Accept [] around IPv6 address - see RFC 5952 */
1839
if(connect_to[0] == '[' and address[-1] == ']')
1840
{
1841
connect_to++;
1842
address[-1] = '\0';
1843
}
1153
1844
} else {
1154
1845
af = AF_INET;
1155
1846
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
1847
address = connect_to;
1848
1849
if(quit_now){
1850
goto end;
1851
}
1852
1853
while(not quit_now){
1854
ret = start_mandos_communication(address, port, if_index, af);
1855
if(quit_now or ret == 0){
1856
break;
1857
}
1858
if(debug){
1859
fprintf(stderr, "Retrying in %d seconds\n",
1860
(int)retry_interval);
1861
}
1862
sleep((int)retry_interval);
1863
};
1864
1865
if (not quit_now){
1161
1866
exitcode = EXIT_SUCCESS;
1162
1867
}
1868
1163
1869
goto end;
1164
1870
}
1165
1871
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
1872
if(quit_now){
1178
1873
goto end;
1179
1874
}
1180
1875
1200
1895
if(mc.server == NULL){
1201
1896
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
1897
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
1898
exitcode = EX_UNAVAILABLE;
1899
goto end;
1900
}
1901
1902
if(quit_now){
1204
1903
goto end;
1205
1904
}
1206
1905
1207
1906
/* Create the Avahi service browser */
1208
1907
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1908
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1909
NULL, 0, browse_callback, NULL);
1211
1910
if(sb == NULL){
1212
1911
fprintf(stderr, "Failed to create service browser: %s\n",
1213
1912
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
1913
exitcode = EX_UNAVAILABLE;
1914
goto end;
1915
}
1916
1917
if(quit_now){
1215
1918
goto end;
1216
1919
}
1217
1920
1220
1923
if(debug){
1221
1924
fprintf(stderr, "Starting Avahi loop search\n");
1222
1925
}
1223
1224
avahi_simple_poll_loop(mc.simple_poll);
1926
1927
ret = avahi_loop_with_timeout(mc.simple_poll,
1928
(int)(retry_interval * 1000));
1929
if(debug){
1930
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1931
(ret == 0) ? "successfully" : "with error");
1932
}
1225
1933
1226
1934
end:
1227
1935
1248
1956
if(gpgme_initialized){
1249
1957
gpgme_release(mc.ctx);
1250
1958
}
1251
1252
/* Removes the temp directory used by GPGME */
1959
1960
/* Cleans up the circular linked list of Mandos servers the client
1961
has seen */
1962
if(mc.current_server != NULL){
1963
mc.current_server->prev->next = NULL;
1964
while(mc.current_server != NULL){
1965
server *next = mc.current_server->next;
1966
free(mc.current_server);
1967
mc.current_server = next;
1968
}
1969
}
1970
1971
/* Take down the network interface */
1972
if(take_down_interface){
1973
/* Re-raise priviliges */
1974
errno = 0;
1975
ret = seteuid(0);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
if(geteuid() == 0){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_UP) {
1984
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1985
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1988
}
1989
}
1990
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
if(ret == -1){
1992
perror_plus("close");
1993
}
1994
/* Lower privileges permanently */
1995
errno = 0;
1996
ret = setuid(uid);
1997
if(ret == -1){
1998
perror_plus("setuid");
1999
}
2000
}
2001
}
2002
2003
/* Removes the GPGME temp directory and all files inside */
1253
2004
if(tempdir_created){
1254
DIR *d;
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1257
if(d == NULL){
1258
if(errno != ENOENT){
1259
perror("opendir");
1260
}
1261
} else {
1262
while(true){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1265
break;
1266
}
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1272
continue;
1273
}
2005
struct dirent **direntries = NULL;
2006
struct dirent *direntry = NULL;
2007
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
2008
if (ret > 0){
2009
for(int i = 0; i < ret; i++){
2010
direntry = direntries[i];
1274
2011
char *fullname = NULL;
1275
2012
ret = asprintf(&fullname, "%s/%s", tempdir,
1276
2013
direntry->d_name);
1277
2014
if(ret < 0){
1278
perror("asprintf");
2015
perror_plus("asprintf");
1279
2016
continue;
1280
2017
}
1281
2018
ret = remove(fullname);
1285
2022
}
1286
2023
free(fullname);
1287
2024
}
1288
closedir(d);
2025
}
2026
2027
/* need to be cleaned even if ret == 0 because man page doesn't
2028
specify */
2029
free(direntries);
2030
if (ret == -1){
2031
perror_plus("scandir");
1289
2032
}
1290
2033
ret = rmdir(tempdir);
1291
2034
if(ret == -1 and errno != ENOENT){
1292
perror("rmdir");
1293
}
2035
perror_plus("rmdir");
2036
}
2037
}
2038
2039
if(quit_now){
2040
sigemptyset(&old_sigterm_action.sa_mask);
2041
old_sigterm_action.sa_handler = SIG_DFL;
2042
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2043
&old_sigterm_action,
2044
NULL));
2045
if(ret == -1){
2046
perror_plus("sigaction");
2047
}
2048
do {
2049
ret = raise(signal_received);
2050
} while(ret != 0 and errno == EINTR);
2051
if(ret != 0){
2052
perror_plus("raise");
2053
abort();
2054
}
2055
TEMP_FAILURE_RETRY(pause());
1294
2056
}
1295
2057
1296
2058
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0