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- Committer: Teddy Hogeborn
- Date: 2010-10-03 01:38:05 UTC
- mfrom: (24.1.170 mandos)
- Revision ID: teddy@fukt.bsnet.se-20101003013805-ojt18455zatp2ewh
Merge from Björn.
- files removed:
- debian/source/local-options
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
87
91
88
#ifdef __linux__
92
89
#include <sys/klog.h> /* klogctl() */
110
107
init_gnutls_session(),
111
108
GNUTLS_* */
112
109
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
115
112
116
113
/* GPGME */
117
114
#include <gpgme.h> /* All GPGME types, constants and
125
122
#define PATHDIR "/conf/conf.d/mandos"
126
123
#define SECKEY "seckey.txt"
127
124
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
125
130
126
bool debug = false;
131
127
static const char mandos_protocol_version[] = "1";
132
128
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
130
static const char sys_class_net[] = "/sys/class/net";
135
131
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
148
132
149
133
/* Used for passing in values through the Avahi callback functions */
150
134
typedef struct {
155
139
gnutls_dh_params_t dh_params;
156
140
const char *priority;
157
141
gpgme_ctx_t ctx;
158
server *current_server;
159
142
} mandos_context;
160
143
161
144
/* global context so signal handler can reach it*/
162
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
146
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
166
148
167
149
sig_atomic_t quit_now = 0;
168
150
int signal_received = 0;
169
151
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
184
185
152
/*
186
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
154
* bytes. "buffer_capacity" is how much is currently allocated,
188
155
* "buffer_length" is how much is already used.
189
156
*/
190
157
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
158
size_t buffer_capacity){
192
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
161
if(buffer == NULL){
199
166
return buffer_capacity;
200
167
}
201
168
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
239
169
/*
240
170
* Initialize GPGME.
241
171
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
244
174
gpgme_error_t rc;
245
175
gpgme_engine_info_t engine_info;
246
176
255
185
256
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
187
if(fd == -1){
258
perror_plus("open");
188
perror("open");
259
189
return false;
260
190
}
261
191
262
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
193
if(rc != GPG_ERR_NO_ERROR){
264
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
195
gpgme_strsource(rc), gpgme_strerror(rc));
266
196
return false;
267
197
}
268
198
269
199
rc = gpgme_op_import(mc.ctx, pgp_data);
270
200
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
272
202
gpgme_strsource(rc), gpgme_strerror(rc));
273
203
return false;
274
204
}
275
205
276
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
277
207
if(ret == -1){
278
perror_plus("close");
208
perror("close");
279
209
}
280
210
gpgme_data_release(pgp_data);
281
211
return true;
282
212
}
283
213
284
214
if(debug){
285
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
286
216
}
287
217
288
218
/* Init GPGME */
289
219
gpgme_check_version(NULL);
290
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
291
221
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
293
223
gpgme_strsource(rc), gpgme_strerror(rc));
294
224
return false;
295
225
}
296
226
297
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
298
228
rc = gpgme_get_engine_info(&engine_info);
299
229
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
301
231
gpgme_strsource(rc), gpgme_strerror(rc));
302
232
return false;
303
233
}
310
240
engine_info = engine_info->next;
311
241
}
312
242
if(engine_info == NULL){
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
314
244
return false;
315
245
}
316
246
317
247
/* Create new GPGME "context" */
318
248
rc = gpgme_new(&(mc.ctx));
319
249
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
323
252
return false;
324
253
}
325
254
344
273
ssize_t plaintext_length = 0;
345
274
346
275
if(debug){
347
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
348
277
}
349
278
350
279
/* Create new GPGME data buffer from memory cryptotext */
351
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
281
0);
353
282
if(rc != GPG_ERR_NO_ERROR){
354
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
355
284
gpgme_strsource(rc), gpgme_strerror(rc));
356
285
return -1;
357
286
}
359
288
/* Create new empty GPGME data buffer for the plaintext */
360
289
rc = gpgme_data_new(&dh_plain);
361
290
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
364
292
gpgme_strsource(rc), gpgme_strerror(rc));
365
293
gpgme_data_release(dh_crypto);
366
294
return -1;
370
298
data buffer */
371
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
300
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
374
302
gpgme_strsource(rc), gpgme_strerror(rc));
375
303
plaintext_length = -1;
376
304
if(debug){
377
305
gpgme_decrypt_result_t result;
378
306
result = gpgme_op_decrypt_result(mc.ctx);
379
307
if(result == NULL){
380
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
381
309
} else {
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
310
fprintf(stderr, "Unsupported algorithm: %s\n",
383
311
result->unsupported_algorithm);
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
312
fprintf(stderr, "Wrong key usage: %u\n",
385
313
result->wrong_key_usage);
386
314
if(result->file_name != NULL){
387
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
388
316
}
389
317
gpgme_recipient_t recipient;
390
318
recipient = result->recipients;
391
319
while(recipient != NULL){
392
fprintf_plus(stderr, "Public key algorithm: %s\n",
320
fprintf(stderr, "Public key algorithm: %s\n",
393
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
394
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
fprintf_plus(stderr, "Secret key available: %s\n",
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
396
324
recipient->status == GPG_ERR_NO_SECKEY
397
325
? "No" : "Yes");
398
326
recipient = recipient->next;
403
331
}
404
332
405
333
if(debug){
406
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
407
335
}
408
336
409
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
410
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
411
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
412
340
plaintext_length = -1;
413
341
goto decrypt_end;
414
342
}
416
344
*plaintext = NULL;
417
345
while(true){
418
346
plaintext_capacity = incbuffer(plaintext,
419
(size_t)plaintext_length,
420
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
421
349
if(plaintext_capacity == 0){
422
perror_plus("incbuffer");
423
plaintext_length = -1;
424
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
425
353
}
426
354
427
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
432
360
break;
433
361
}
434
362
if(ret < 0){
435
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
436
364
plaintext_length = -1;
437
365
goto decrypt_end;
438
366
}
440
368
}
441
369
442
370
if(debug){
443
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
444
372
for(ssize_t i = 0; i < plaintext_length; i++){
445
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
446
374
}
468
396
/* GnuTLS log function callback */
469
397
static void debuggnutls(__attribute__((unused)) int level,
470
398
const char* string){
471
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
472
400
}
473
401
474
402
static int init_gnutls_global(const char *pubkeyfilename,
476
404
int ret;
477
405
478
406
if(debug){
479
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
480
408
}
481
409
482
410
ret = gnutls_global_init();
483
411
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
485
414
return -1;
486
415
}
487
416
494
423
}
495
424
496
425
/* OpenPGP credentials */
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
498
427
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
500
433
gnutls_global_deinit();
501
434
return -1;
502
435
}
503
436
504
437
if(debug){
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
506
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
507
440
seckeyfilename);
508
441
}
511
444
(mc.cred, pubkeyfilename, seckeyfilename,
512
445
GNUTLS_OPENPGP_FMT_BASE64);
513
446
if(ret != GNUTLS_E_SUCCESS){
514
fprintf_plus(stderr,
515
"Error[%d] while reading the OpenPGP key pair ('%s',"
516
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
518
452
goto globalfail;
519
453
}
520
454
521
455
/* GnuTLS server initialization */
522
456
ret = gnutls_dh_params_init(&mc.dh_params);
523
457
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
525
459
" %s\n", safer_gnutls_strerror(ret));
526
460
goto globalfail;
527
461
}
528
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
529
463
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
531
465
safer_gnutls_strerror(ret));
532
466
goto globalfail;
533
467
}
554
488
}
555
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
556
490
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
558
492
safer_gnutls_strerror(ret));
559
493
}
560
494
568
502
}
569
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
504
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
573
508
gnutls_deinit(*session);
574
509
return -1;
575
510
}
584
519
}
585
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
521
if(ret != GNUTLS_E_SUCCESS){
587
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
523
safer_gnutls_strerror(ret));
589
524
gnutls_deinit(*session);
590
525
return -1;
636
571
pf = PF_INET;
637
572
break;
638
573
default:
639
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
640
575
errno = EINVAL;
641
576
return -1;
642
577
}
647
582
}
648
583
649
584
if(debug){
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
586
"\n", ip, port);
652
587
}
653
588
654
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
655
590
if(tcp_sd < 0){
656
591
int e = errno;
657
perror_plus("socket");
592
perror("socket");
658
593
errno = e;
659
594
goto mandos_end;
660
595
}
674
609
}
675
610
if(ret < 0 ){
676
611
int e = errno;
677
perror_plus("inet_pton");
612
perror("inet_pton");
678
613
errno = e;
679
614
goto mandos_end;
680
615
}
681
616
if(ret == 0){
682
617
int e = errno;
683
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
684
619
errno = e;
685
620
goto mandos_end;
686
621
}
691
626
692
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
629
-Wunreachable-code*/
695
630
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
632
" without a network interface\n");
698
633
errno = EINVAL;
699
634
goto mandos_end;
716
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
717
652
char interface[IF_NAMESIZE];
718
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
perror_plus("if_indextoname");
654
perror("if_indextoname");
720
655
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
657
ip, interface, port);
723
658
}
724
659
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
726
662
}
727
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
735
671
sizeof(addrstr));
736
672
}
737
673
if(pcret == NULL){
738
perror_plus("inet_ntop");
674
perror("inet_ntop");
739
675
} else {
740
676
if(strcmp(addrstr, ip) != 0){
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
742
678
}
743
679
}
744
680
}
756
692
if(ret < 0){
757
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
694
int e = errno;
759
perror_plus("connect");
695
perror("connect");
760
696
errno = e;
761
697
}
762
698
goto mandos_end;
772
708
while(true){
773
709
size_t out_size = strlen(out);
774
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
775
out_size - written));
711
out_size - written));
776
712
if(ret == -1){
777
713
int e = errno;
778
perror_plus("write");
714
perror("write");
779
715
errno = e;
780
716
goto mandos_end;
781
717
}
798
734
}
799
735
800
736
if(debug){
801
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
802
738
}
803
739
804
740
if(quit_now){
806
742
goto mandos_end;
807
743
}
808
744
809
/* Spurious warning from -Wint-to-pointer-cast */
810
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
811
746
812
747
if(quit_now){
824
759
825
760
if(ret != GNUTLS_E_SUCCESS){
826
761
if(debug){
827
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
828
763
gnutls_perror(ret);
829
764
}
830
765
errno = EPROTO;
834
769
/* Read OpenPGP packet that contains the wanted password */
835
770
836
771
if(debug){
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
838
774
}
839
775
840
776
while(true){
845
781
}
846
782
847
783
buffer_capacity = incbuffer(&buffer, buffer_length,
848
buffer_capacity);
784
buffer_capacity);
849
785
if(buffer_capacity == 0){
850
786
int e = errno;
851
perror_plus("incbuffer");
787
perror("incbuffer");
852
788
errno = e;
853
789
goto mandos_end;
854
790
}
878
814
}
879
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
880
816
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
882
818
gnutls_perror(ret);
883
819
errno = EPROTO;
884
820
goto mandos_end;
885
821
}
886
822
break;
887
823
default:
888
fprintf_plus(stderr, "Unknown error while reading data from"
824
fprintf(stderr, "Unknown error while reading data from"
889
825
" encrypted session with Mandos server\n");
890
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
827
errno = EIO;
897
833
}
898
834
899
835
if(debug){
900
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
901
837
}
902
838
903
839
if(quit_now){
915
851
916
852
if(buffer_length > 0){
917
853
ssize_t decrypted_buffer_size;
918
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
919
856
&decrypted_buffer);
920
857
if(decrypted_buffer_size >= 0){
921
858
932
869
if(ret == 0 and ferror(stdout)){
933
870
int e = errno;
934
871
if(debug){
935
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
872
fprintf(stderr, "Error writing encrypted data: %s\n",
936
873
strerror(errno));
937
874
}
938
875
errno = e;
958
895
if(e == 0){
959
896
e = errno;
960
897
}
961
perror_plus("close");
898
perror("close");
962
899
}
963
900
gnutls_deinit(session);
964
errno = e;
965
901
if(quit_now){
966
errno = EINTR;
902
e = EINTR;
967
903
retval = -1;
968
904
}
905
errno = e;
969
906
}
970
907
return retval;
971
908
}
996
933
switch(event){
997
934
default:
998
935
case AVAHI_RESOLVER_FAILURE:
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1000
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
1001
938
avahi_strerror(avahi_server_errno(mc.server)));
1002
939
break;
1006
943
char ip[AVAHI_ADDRESS_STR_MAX];
1007
944
avahi_address_snprint(ip, sizeof(ip), address);
1008
945
if(debug){
1009
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
948
ip, (intmax_t)interface, port);
1012
949
}
1014
951
avahi_proto_to_af(proto));
1015
952
if(ret == 0){
1016
953
avahi_simple_poll_quit(mc.simple_poll);
1017
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
1020
954
}
1021
955
}
1022
956
}
1046
980
default:
1047
981
case AVAHI_BROWSER_FAILURE:
1048
982
1049
fprintf_plus(stderr, "(Avahi browser) %s\n",
983
fprintf(stderr, "(Avahi browser) %s\n",
1050
984
avahi_strerror(avahi_server_errno(mc.server)));
1051
985
avahi_simple_poll_quit(mc.simple_poll);
1052
986
return;
1060
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
995
name, type, domain, protocol, 0,
1062
996
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1065
999
break;
1066
1000
1070
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1071
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1072
1006
if(debug){
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1074
1008
}
1075
1009
break;
1076
1010
}
1077
1011
}
1078
1012
1079
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1080
1014
static void handle_sigterm(int sig){
1081
1015
if(quit_now){
1082
1016
return;
1084
1018
quit_now = 1;
1085
1019
signal_received = sig;
1086
1020
int old_errno = errno;
1087
/* set main loop to exit */
1088
1021
if(mc.simple_poll != NULL){
1089
1022
avahi_simple_poll_quit(mc.simple_poll);
1090
1023
}
1091
1024
errno = old_errno;
1092
1025
}
1093
1026
1094
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
int ret;
1096
1097
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
if(s < 0){
1099
perror_plus("socket");
1100
return false;
1101
}
1102
strcpy(ifr->ifr_name, ifname);
1103
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
if(ret == -1){
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
if(if_entry->d_name[0] == '.'){
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1105
1081
if(debug){
1106
perror_plus("ioctl SIOCGIFFLAGS");
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1107
1084
}
1108
return false;
1085
free(flagstring);
1086
return 0;
1109
1087
}
1110
return true;
1111
}
1112
1113
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1115
1090
/* Reject the loopback device */
1116
if(ifr->ifr_flags & IFF_LOOPBACK){
1091
if(flags & IFF_LOOPBACK){
1117
1092
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1119
1095
}
1120
return false;
1096
return 0;
1121
1097
}
1122
1098
/* Accept point-to-point devices only if connect_to is specified */
1123
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1124
1100
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1126
1103
}
1127
return true;
1104
return 1;
1128
1105
}
1129
1106
/* Otherwise, reject non-broadcast-capable devices */
1130
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1133
}
1134
return false;
1135
}
1136
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
if(ifr->ifr_flags & IFF_NOARP){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1140
}
1141
return false;
1142
}
1143
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1144
1114
/* Accept this device */
1145
1115
if(debug){
1146
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1147
}
1148
return true;
1149
}
1150
1151
/*
1152
* This function determines if a directory entry in /sys/class/net
1153
* corresponds to an acceptable network device.
1154
* (This function is passed to scandir(3) as a filter function.)
1155
*/
1156
int good_interface(const struct dirent *if_entry){
1157
if(if_entry->d_name[0] == '.'){
1158
return 0;
1159
}
1160
1161
struct ifreq ifr;
1162
if(not get_flags(if_entry->d_name, &ifr)){
1163
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1219
int notdotentries(const struct dirent *direntry){
1220
/* Skip "." and ".." */
1221
if(direntry->d_name[0] == '.'
1222
and (direntry->d_name[1] == '\0'
1223
or (direntry->d_name[1] == '.'
1224
and direntry->d_name[2] == '\0'))){
1225
return 0;
1226
}
1227
return 1;
1228
}
1229
1230
/* Is this directory entry a runnable program? */
1231
int runnable_hook(const struct dirent *direntry){
1232
int ret;
1233
size_t sret;
1234
struct stat st;
1235
1236
if((direntry->d_name)[0] == '\0'){
1237
/* Empty name? */
1238
return 0;
1239
}
1240
1241
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1242
"abcdefghijklmnopqrstuvwxyz"
1243
"0123456789"
1244
"_-");
1245
if((direntry->d_name)[sret] != '\0'){
1246
/* Contains non-allowed characters */
1247
if(debug){
1248
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1262
if(ret == -1){
1263
if(debug){
1264
perror_plus("Could not stat hook");
1265
}
1266
return 0;
1267
}
1268
if(not (S_ISREG(st.st_mode))){
1269
/* Not a regular file */
1270
if(debug){
1271
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1273
}
1274
return 0;
1275
}
1276
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1277
/* Not executable */
1278
if(debug){
1279
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1281
}
1282
return 0;
1283
}
1284
return 1;
1285
}
1286
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1288
int ret;
1289
struct timespec now;
1290
struct timespec waited_time;
1291
intmax_t block_time;
1292
1293
while(true){
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1297
}
1298
ret = avahi_simple_poll_iterate(s, -1);
1299
} else {
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1303
}
1304
/* the current time */
1305
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1306
if(ret == -1){
1307
perror_plus("clock_gettime");
1308
return -1;
1309
}
1310
/* Calculating in ms how long time between now and server
1311
who we visted longest time ago. Now - last seen. */
1312
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
1314
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
1316
/* total time is 10s/10,000ms.
1317
Converting to s from ms by dividing by 1,000,
1318
and ns to ms by dividing by 1,000,000. */
1319
block_time = ((retry_interval
1320
- ((intmax_t)waited_time.tv_sec * 1000))
1321
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1325
}
1326
1327
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1332
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
1334
return 0;
1335
}
1336
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
mc.current_server = mc.current_server->next;
1343
block_time = 0; /* Call avahi to find new Mandos
1344
servers, but don't block */
1345
}
1346
1347
ret = avahi_simple_poll_iterate(s, (int)block_time);
1348
}
1349
if(ret != 0){
1350
if (ret > 0 or errno != EINTR){
1351
return (ret != 1) ? ret : 0;
1352
}
1353
}
1354
}
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
1355
1120
}
1356
1121
1357
1122
int main(int argc, char *argv[]){
1376
1141
bool gnutls_initialized = false;
1377
1142
bool gpgme_initialized = false;
1378
1143
float delay = 2.5f;
1379
double retry_interval = 10; /* 10s between trying a server and
1380
retrying the same server again */
1381
1144
1382
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1383
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1389
1152
errno = 0;
1390
1153
ret = setgid(gid);
1391
1154
if(ret == -1){
1392
perror_plus("setgid");
1155
perror("setgid");
1393
1156
}
1394
1157
1395
1158
/* Lower user privileges (temporarily) */
1396
1159
errno = 0;
1397
1160
ret = seteuid(uid);
1398
1161
if(ret == -1){
1399
perror_plus("seteuid");
1162
perror("seteuid");
1400
1163
}
1401
1164
1402
1165
if(quit_now){
1437
1200
.arg = "SECONDS",
1438
1201
.doc = "Maximum delay to wait for interface startup",
1439
1202
.group = 2 },
1440
{ .name = "retry", .key = 132,
1441
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
1443
.group = 2 },
1444
{ .name = "network-hook-dir", .key = 133,
1445
.arg = "DIR",
1446
.doc = "Directory where network hooks are located",
1447
.group = 2 },
1448
1203
/*
1449
1204
* These reproduce what we would get without ARGP_NO_HELP
1450
1205
*/
1494
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1495
1250
argp_error(state, "Bad delay");
1496
1251
}
1497
case 132: /* --retry */
1498
errno = 0;
1499
retry_interval = strtod(arg, &tmp);
1500
if(errno != 0 or tmp == arg or *tmp != '\0'
1501
or (retry_interval * 1000) > INT_MAX
1502
or retry_interval < 0){
1503
argp_error(state, "Bad retry interval");
1504
}
1505
break;
1506
case 133: /* --network-hook-dir */
1507
hookdir = arg;
1508
1252
break;
1509
1253
/*
1510
1254
* These reproduce what we would get without ARGP_NO_HELP
1517
1261
argp_state_help(state, state->out_stream,
1518
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
1263
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1522
1265
exit(argp_err_exit_status);
1523
1266
break;
1524
1267
default:
1539
1282
case ENOMEM:
1540
1283
default:
1541
1284
errno = ret;
1542
perror_plus("argp_parse");
1285
perror("argp_parse");
1543
1286
exitcode = EX_OSERR;
1544
1287
goto end;
1545
1288
case EINVAL:
1547
1290
goto end;
1548
1291
}
1549
1292
}
1550
1551
{
1552
/* Work around Debian bug #633582:
1553
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
1619
} else {
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
1700
goto end;
1701
}
1702
}
1703
close(devnull);
1704
}
1705
}
1706
1293
1707
1294
if(not debug){
1708
1295
avahi_set_log_function(empty_log);
1709
1296
}
1710
1297
1711
1298
if(interface[0] == '\0'){
1712
1299
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1715
1301
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
1302
if(ret >= 1){
1723
/* Pick the first interface returned */
1303
/* Pick the first good interface */
1724
1304
interface = strdup(direntries[0]->d_name);
1725
1305
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1727
1307
}
1728
1308
if(interface == NULL){
1729
perror_plus("malloc");
1309
perror("malloc");
1730
1310
free(direntries);
1731
1311
exitcode = EXIT_FAILURE;
1732
1312
goto end;
1734
1314
free(direntries);
1735
1315
} else {
1736
1316
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1317
fprintf(stderr, "Could not find a network interface\n");
1738
1318
exitcode = EXIT_FAILURE;
1739
1319
goto end;
1740
1320
}
1746
1326
srand((unsigned int) time(NULL));
1747
1327
mc.simple_poll = avahi_simple_poll_new();
1748
1328
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1750
1330
exitcode = EX_UNAVAILABLE;
1751
1331
goto end;
1752
1332
}
1754
1334
sigemptyset(&sigterm_action.sa_mask);
1755
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1756
1336
if(ret == -1){
1757
perror_plus("sigaddset");
1337
perror("sigaddset");
1758
1338
exitcode = EX_OSERR;
1759
1339
goto end;
1760
1340
}
1761
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1762
1342
if(ret == -1){
1763
perror_plus("sigaddset");
1343
perror("sigaddset");
1764
1344
exitcode = EX_OSERR;
1765
1345
goto end;
1766
1346
}
1767
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1768
1348
if(ret == -1){
1769
perror_plus("sigaddset");
1349
perror("sigaddset");
1770
1350
exitcode = EX_OSERR;
1771
1351
goto end;
1772
1352
}
1776
1356
*/
1777
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1778
1358
if(ret == -1){
1779
perror_plus("sigaction");
1359
perror("sigaction");
1780
1360
return EX_OSERR;
1781
1361
}
1782
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1783
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1784
1364
if(ret == -1){
1785
perror_plus("sigaction");
1365
perror("sigaction");
1786
1366
exitcode = EX_OSERR;
1787
1367
goto end;
1788
1368
}
1789
1369
}
1790
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1791
1371
if(ret == -1){
1792
perror_plus("sigaction");
1372
perror("sigaction");
1793
1373
return EX_OSERR;
1794
1374
}
1795
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1796
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1797
1377
if(ret == -1){
1798
perror_plus("sigaction");
1378
perror("sigaction");
1799
1379
exitcode = EX_OSERR;
1800
1380
goto end;
1801
1381
}
1802
1382
}
1803
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1804
1384
if(ret == -1){
1805
perror_plus("sigaction");
1385
perror("sigaction");
1806
1386
return EX_OSERR;
1807
1387
}
1808
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1809
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1810
1390
if(ret == -1){
1811
perror_plus("sigaction");
1391
perror("sigaction");
1812
1392
exitcode = EX_OSERR;
1813
1393
goto end;
1814
1394
}
1818
1398
if(strcmp(interface, "none") != 0){
1819
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1820
1400
if(if_index == 0){
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1822
1402
exitcode = EX_UNAVAILABLE;
1823
1403
goto end;
1824
1404
}
1831
1411
errno = 0;
1832
1412
ret = seteuid(0);
1833
1413
if(ret == -1){
1834
perror_plus("seteuid");
1414
perror("seteuid");
1835
1415
}
1836
1416
1837
1417
#ifdef __linux__
1841
1421
bool restore_loglevel = true;
1842
1422
if(ret == -1){
1843
1423
restore_loglevel = false;
1844
perror_plus("klogctl");
1424
perror("klogctl");
1845
1425
}
1846
1426
#endif /* __linux__ */
1847
1427
1848
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
1429
if(sd < 0){
1850
perror_plus("socket");
1430
perror("socket");
1851
1431
exitcode = EX_OSERR;
1852
1432
#ifdef __linux__
1853
1433
if(restore_loglevel){
1854
1434
ret = klogctl(7, NULL, 0);
1855
1435
if(ret == -1){
1856
perror_plus("klogctl");
1436
perror("klogctl");
1857
1437
}
1858
1438
}
1859
1439
#endif /* __linux__ */
1861
1441
errno = 0;
1862
1442
ret = seteuid(uid);
1863
1443
if(ret == -1){
1864
perror_plus("seteuid");
1444
perror("seteuid");
1865
1445
}
1866
1446
goto end;
1867
1447
}
1868
1448
strcpy(network.ifr_name, interface);
1869
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
1450
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1872
1452
#ifdef __linux__
1873
1453
if(restore_loglevel){
1874
1454
ret = klogctl(7, NULL, 0);
1875
1455
if(ret == -1){
1876
perror_plus("klogctl");
1456
perror("klogctl");
1877
1457
}
1878
1458
}
1879
1459
#endif /* __linux__ */
1882
1462
errno = 0;
1883
1463
ret = seteuid(uid);
1884
1464
if(ret == -1){
1885
perror_plus("seteuid");
1465
perror("seteuid");
1886
1466
}
1887
1467
goto end;
1888
1468
}
1892
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
1473
if(ret == -1){
1894
1474
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1896
1476
exitcode = EX_OSERR;
1897
1477
#ifdef __linux__
1898
1478
if(restore_loglevel){
1899
1479
ret = klogctl(7, NULL, 0);
1900
1480
if(ret == -1){
1901
perror_plus("klogctl");
1481
perror("klogctl");
1902
1482
}
1903
1483
}
1904
1484
#endif /* __linux__ */
1906
1486
errno = 0;
1907
1487
ret = seteuid(uid);
1908
1488
if(ret == -1){
1909
perror_plus("seteuid");
1489
perror("seteuid");
1910
1490
}
1911
1491
goto end;
1912
1492
}
1913
1493
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
1916
1495
for(int i=0; i < delay * 4; i++){
1917
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
1497
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
1920
1499
} else if(network.ifr_flags & IFF_RUNNING){
1921
1500
break;
1922
1501
}
1923
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
1503
ret = nanosleep(&sleeptime, NULL);
1925
1504
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1505
perror("nanosleep");
1927
1506
}
1928
1507
}
1929
1508
if(not take_down_interface){
1930
1509
/* We won't need the socket anymore */
1931
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
1511
if(ret == -1){
1933
perror_plus("close");
1512
perror("close");
1934
1513
}
1935
1514
}
1936
1515
#ifdef __linux__
1938
1517
/* Restores kernel loglevel to default */
1939
1518
ret = klogctl(7, NULL, 0);
1940
1519
if(ret == -1){
1941
perror_plus("klogctl");
1520
perror("klogctl");
1942
1521
}
1943
1522
}
1944
1523
#endif /* __linux__ */
1948
1527
/* Lower privileges */
1949
1528
ret = seteuid(uid);
1950
1529
if(ret == -1){
1951
perror_plus("seteuid");
1530
perror("seteuid");
1952
1531
}
1953
1532
} else {
1954
1533
/* Lower privileges permanently */
1955
1534
ret = setuid(uid);
1956
1535
if(ret == -1){
1957
perror_plus("setuid");
1536
perror("setuid");
1958
1537
}
1959
1538
}
1960
1539
}
1965
1544
1966
1545
ret = init_gnutls_global(pubkey, seckey);
1967
1546
if(ret == -1){
1968
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
1969
1548
exitcode = EX_UNAVAILABLE;
1970
1549
goto end;
1971
1550
} else {
1976
1555
goto end;
1977
1556
}
1978
1557
1558
tempdir_created = true;
1979
1559
if(mkdtemp(tempdir) == NULL){
1980
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
1981
1562
goto end;
1982
1563
}
1983
tempdir_created = true;
1984
1564
1985
1565
if(quit_now){
1986
1566
goto end;
1987
1567
}
1988
1568
1989
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1990
fprintf_plus(stderr, "init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
1991
1571
exitcode = EX_UNAVAILABLE;
1992
1572
goto end;
1993
1573
} else {
2003
1583
/* (Mainly meant for debugging) */
2004
1584
char *address = strrchr(connect_to, ':');
2005
1585
if(address == NULL){
2006
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2007
1587
exitcode = EX_USAGE;
2008
1588
goto end;
2009
1589
}
2017
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2018
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
1599
or tmpmax != (uint16_t)tmpmax){
2020
fprintf_plus(stderr, "Bad port number\n");
1600
fprintf(stderr, "Bad port number\n");
2021
1601
exitcode = EX_USAGE;
2022
1602
goto end;
2023
1603
}
2028
1608
2029
1609
port = (uint16_t)tmpmax;
2030
1610
*address = '\0';
1611
address = connect_to;
2031
1612
/* Colon in address indicates IPv6 */
2032
1613
int af;
2033
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2034
1615
af = AF_INET6;
2035
/* Accept [] around IPv6 address - see RFC 5952 */
2036
if(connect_to[0] == '[' and address[-1] == ']')
2037
{
2038
connect_to++;
2039
address[-1] = '\0';
2040
}
2041
1616
} else {
2042
1617
af = AF_INET;
2043
1618
}
2044
address = connect_to;
2045
1619
2046
1620
if(quit_now){
2047
1621
goto end;
2048
1622
}
2049
1623
2050
1624
while(not quit_now){
2051
1625
ret = start_mandos_communication(address, port, if_index, af);
2052
1626
if(quit_now or ret == 0){
2053
1627
break;
2054
1628
}
2055
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2057
}
2058
sleep((int)retry_interval);
2059
}
2060
1629
sleep(15);
1630
};
1631
2061
1632
if (not quit_now){
2062
1633
exitcode = EXIT_SUCCESS;
2063
1634
}
2064
1635
2065
1636
goto end;
2066
1637
}
2067
1638
2089
1660
2090
1661
/* Check if creating the Avahi server object succeeded */
2091
1662
if(mc.server == NULL){
2092
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
2093
1664
avahi_strerror(error));
2094
1665
exitcode = EX_UNAVAILABLE;
2095
1666
goto end;
2104
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
1676
NULL, 0, browse_callback, NULL);
2106
1677
if(sb == NULL){
2107
fprintf_plus(stderr, "Failed to create service browser: %s\n",
1678
fprintf(stderr, "Failed to create service browser: %s\n",
2108
1679
avahi_strerror(avahi_server_errno(mc.server)));
2109
1680
exitcode = EX_UNAVAILABLE;
2110
1681
goto end;
2117
1688
/* Run the main loop */
2118
1689
2119
1690
if(debug){
2120
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
}
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2125
if(debug){
2126
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
2128
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2129
1695
2130
1696
end:
2131
1697
2132
1698
if(debug){
2133
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2134
1700
}
2135
1701
2136
1702
/* Cleanup things */
2152
1718
if(gpgme_initialized){
2153
1719
gpgme_release(mc.ctx);
2154
1720
}
2155
2156
/* Cleans up the circular linked list of Mandos servers the client
2157
has seen */
2158
if(mc.current_server != NULL){
2159
mc.current_server->prev->next = NULL;
2160
while(mc.current_server != NULL){
2161
server *next = mc.current_server->next;
2162
free(mc.current_server);
2163
mc.current_server = next;
2164
}
2165
}
2166
2167
/* XXX run network hooks "stop" here */
2168
1721
2169
1722
/* Take down the network interface */
2170
1723
if(take_down_interface){
2172
1725
errno = 0;
2173
1726
ret = seteuid(0);
2174
1727
if(ret == -1){
2175
perror_plus("seteuid");
1728
perror("seteuid");
2176
1729
}
2177
1730
if(geteuid() == 0){
2178
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
1732
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
2182
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
1737
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2186
1739
}
2187
1740
}
2188
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
1742
if(ret == -1){
2190
perror_plus("close");
1743
perror("close");
2191
1744
}
2192
1745
/* Lower privileges permanently */
2193
1746
errno = 0;
2194
1747
ret = setuid(uid);
2195
1748
if(ret == -1){
2196
perror_plus("setuid");
1749
perror("setuid");
2197
1750
}
2198
1751
}
2199
1752
}
2200
1753
2201
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2202
1755
if(tempdir_created){
2203
struct dirent **direntries = NULL;
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
2208
for(int i = 0; i < numentries; i++){
2209
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2210
1776
char *fullname = NULL;
2211
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
1778
direntry->d_name);
2213
1779
if(ret < 0){
2214
perror_plus("asprintf");
1780
perror("asprintf");
2215
1781
continue;
2216
1782
}
2217
1783
ret = remove(fullname);
2218
1784
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2220
1787
}
2221
1788
free(fullname);
2222
1789
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
1790
closedir(d);
2229
1791
}
2230
1792
ret = rmdir(tempdir);
2231
1793
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
1794
perror("rmdir");
2233
1795
}
2234
1796
}
2235
1797
2240
1802
&old_sigterm_action,
2241
1803
NULL));
2242
1804
if(ret == -1){
2243
perror_plus("sigaction");
1805
perror("sigaction");
2244
1806
}
2245
1807
do {
2246
1808
ret = raise(signal_received);
2247
1809
} while(ret != 0 and errno == EINTR);
2248
1810
if(ret != 0){
2249
perror_plus("raise");
1811
perror("raise");
2250
1812
abort();
2251
1813
}
2252
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0