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- Committer: Björn Påhlsson
- Date: 2011-11-14 19:10:50 UTC
- mto: (505.3.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@fukt.bsnet.se-20111114191050-g11po6084bl9j5kf
replace calls to fprintf with fprintf_plus.
- 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
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
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
76
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
87
90
88
91
#ifdef __linux__
89
92
#include <sys/klog.h> /* klogctl() */
107
110
init_gnutls_session(),
108
111
GNUTLS_* */
109
112
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
112
115
113
116
/* GPGME */
114
117
#include <gpgme.h> /* All GPGME types, constants and
122
125
#define PATHDIR "/conf/conf.d/mandos"
123
126
#define SECKEY "seckey.txt"
124
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
129
126
130
bool debug = false;
127
131
static const char mandos_protocol_version[] = "1";
128
132
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
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;
130
148
131
149
/* Used for passing in values through the Avahi callback functions */
132
150
typedef struct {
137
155
gnutls_dh_params_t dh_params;
138
156
const char *priority;
139
157
gpgme_ctx_t ctx;
158
server *current_server;
140
159
} mandos_context;
141
160
142
161
/* global context so signal handler can reach it*/
143
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
163
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
146
166
147
167
sig_atomic_t quit_now = 0;
148
168
int signal_received = 0;
149
169
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
150
185
/*
151
186
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
187
* bytes. "buffer_capacity" is how much is currently allocated,
153
188
* "buffer_length" is how much is already used.
154
189
*/
155
190
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
191
size_t buffer_capacity){
157
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
194
if(buffer == NULL){
164
199
return buffer_capacity;
165
200
}
166
201
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
167
239
/*
168
240
* Initialize GPGME.
169
241
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
172
244
gpgme_error_t rc;
173
245
gpgme_engine_info_t engine_info;
174
246
183
255
184
256
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
257
if(fd == -1){
186
perror("open");
258
perror_plus("open");
187
259
return false;
188
260
}
189
261
190
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
263
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
264
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
265
gpgme_strsource(rc), gpgme_strerror(rc));
194
266
return false;
195
267
}
196
268
197
269
rc = gpgme_op_import(mc.ctx, pgp_data);
198
270
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
271
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
200
272
gpgme_strsource(rc), gpgme_strerror(rc));
201
273
return false;
202
274
}
203
275
204
276
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
277
if(ret == -1){
206
perror("close");
278
perror_plus("close");
207
279
}
208
280
gpgme_data_release(pgp_data);
209
281
return true;
210
282
}
211
283
212
284
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
285
fprintf_plus(stderr, "Initializing GPGME\n");
214
286
}
215
287
216
288
/* Init GPGME */
217
289
gpgme_check_version(NULL);
218
290
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
291
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
292
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
293
gpgme_strsource(rc), gpgme_strerror(rc));
222
294
return false;
223
295
}
224
296
225
/* Set GPGME home directory for the OpenPGP engine only */
297
/* Set GPGME home directory for the OpenPGP engine only */
226
298
rc = gpgme_get_engine_info(&engine_info);
227
299
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
300
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
301
gpgme_strsource(rc), gpgme_strerror(rc));
230
302
return false;
231
303
}
238
310
engine_info = engine_info->next;
239
311
}
240
312
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
242
314
return false;
243
315
}
244
316
245
317
/* Create new GPGME "context" */
246
318
rc = gpgme_new(&(mc.ctx));
247
319
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
250
323
return false;
251
324
}
252
325
271
344
ssize_t plaintext_length = 0;
272
345
273
346
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
347
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
348
}
276
349
277
350
/* Create new GPGME data buffer from memory cryptotext */
278
351
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
352
0);
280
353
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
354
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
355
gpgme_strsource(rc), gpgme_strerror(rc));
283
356
return -1;
284
357
}
286
359
/* Create new empty GPGME data buffer for the plaintext */
287
360
rc = gpgme_data_new(&dh_plain);
288
361
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
290
364
gpgme_strsource(rc), gpgme_strerror(rc));
291
365
gpgme_data_release(dh_crypto);
292
366
return -1;
296
370
data buffer */
297
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
372
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
373
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
374
gpgme_strsource(rc), gpgme_strerror(rc));
301
375
plaintext_length = -1;
302
376
if(debug){
303
377
gpgme_decrypt_result_t result;
304
378
result = gpgme_op_decrypt_result(mc.ctx);
305
379
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
380
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
381
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
309
383
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
311
385
result->wrong_key_usage);
312
386
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
387
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
388
}
315
389
gpgme_recipient_t recipient;
316
390
recipient = result->recipients;
317
391
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
392
fprintf_plus(stderr, "Public key algorithm: %s\n",
319
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
394
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
fprintf_plus(stderr, "Secret key available: %s\n",
322
396
recipient->status == GPG_ERR_NO_SECKEY
323
397
? "No" : "Yes");
324
398
recipient = recipient->next;
329
403
}
330
404
331
405
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
406
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
407
}
334
408
335
409
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
410
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
411
perror_plus("gpgme_data_seek");
338
412
plaintext_length = -1;
339
413
goto decrypt_end;
340
414
}
342
416
*plaintext = NULL;
343
417
while(true){
344
418
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
419
(size_t)plaintext_length,
420
plaintext_capacity);
347
421
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
422
perror_plus("incbuffer");
423
plaintext_length = -1;
424
goto decrypt_end;
351
425
}
352
426
353
427
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
432
break;
359
433
}
360
434
if(ret < 0){
361
perror("gpgme_data_read");
435
perror_plus("gpgme_data_read");
362
436
plaintext_length = -1;
363
437
goto decrypt_end;
364
438
}
366
440
}
367
441
368
442
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
443
fprintf_plus(stderr, "Decrypted password is: ");
370
444
for(ssize_t i = 0; i < plaintext_length; i++){
371
445
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
446
}
394
468
/* GnuTLS log function callback */
395
469
static void debuggnutls(__attribute__((unused)) int level,
396
470
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
471
fprintf_plus(stderr, "GnuTLS: %s", string);
398
472
}
399
473
400
474
static int init_gnutls_global(const char *pubkeyfilename,
402
476
int ret;
403
477
404
478
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
479
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
480
}
407
481
408
482
ret = gnutls_global_init();
409
483
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
412
485
return -1;
413
486
}
414
487
421
494
}
422
495
423
496
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
425
498
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
431
500
gnutls_global_deinit();
432
501
return -1;
433
502
}
434
503
435
504
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
437
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
507
seckeyfilename);
439
508
}
442
511
(mc.cred, pubkeyfilename, seckeyfilename,
443
512
GNUTLS_OPENPGP_FMT_BASE64);
444
513
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
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));
450
518
goto globalfail;
451
519
}
452
520
453
521
/* GnuTLS server initialization */
454
522
ret = gnutls_dh_params_init(&mc.dh_params);
455
523
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
457
525
" %s\n", safer_gnutls_strerror(ret));
458
526
goto globalfail;
459
527
}
460
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
529
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
463
531
safer_gnutls_strerror(ret));
464
532
goto globalfail;
465
533
}
486
554
}
487
555
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
556
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
490
558
safer_gnutls_strerror(ret));
491
559
}
492
560
500
568
}
501
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
570
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
506
573
gnutls_deinit(*session);
507
574
return -1;
508
575
}
517
584
}
518
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
586
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
587
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
521
588
safer_gnutls_strerror(ret));
522
589
gnutls_deinit(*session);
523
590
return -1;
569
636
pf = PF_INET;
570
637
break;
571
638
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
639
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
640
errno = EINVAL;
574
641
return -1;
575
642
}
580
647
}
581
648
582
649
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
651
"\n", ip, port);
585
652
}
586
653
587
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
655
if(tcp_sd < 0){
589
656
int e = errno;
590
perror("socket");
657
perror_plus("socket");
591
658
errno = e;
592
659
goto mandos_end;
593
660
}
607
674
}
608
675
if(ret < 0 ){
609
676
int e = errno;
610
perror("inet_pton");
677
perror_plus("inet_pton");
611
678
errno = e;
612
679
goto mandos_end;
613
680
}
614
681
if(ret == 0){
615
682
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
683
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
684
errno = e;
618
685
goto mandos_end;
619
686
}
624
691
625
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
694
-Wunreachable-code*/
628
695
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
630
697
" without a network interface\n");
631
698
errno = EINVAL;
632
699
goto mandos_end;
649
716
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
717
char interface[IF_NAMESIZE];
651
718
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
719
perror_plus("if_indextoname");
653
720
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
722
ip, interface, port);
656
723
}
657
724
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
660
726
}
661
727
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
728
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
669
735
sizeof(addrstr));
670
736
}
671
737
if(pcret == NULL){
672
perror("inet_ntop");
738
perror_plus("inet_ntop");
673
739
} else {
674
740
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
676
742
}
677
743
}
678
744
}
688
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
755
}
690
756
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
694
762
goto mandos_end;
695
763
}
696
764
704
772
while(true){
705
773
size_t out_size = strlen(out);
706
774
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
775
out_size - written));
708
776
if(ret == -1){
709
777
int e = errno;
710
perror("write");
778
perror_plus("write");
711
779
errno = e;
712
780
goto mandos_end;
713
781
}
730
798
}
731
799
732
800
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
801
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
802
}
735
803
736
804
if(quit_now){
738
806
goto mandos_end;
739
807
}
740
808
809
/* Spurious warning from -Wint-to-pointer-cast */
741
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
811
743
812
if(quit_now){
755
824
756
825
if(ret != GNUTLS_E_SUCCESS){
757
826
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
827
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
828
gnutls_perror(ret);
760
829
}
761
830
errno = EPROTO;
765
834
/* Read OpenPGP packet that contains the wanted password */
766
835
767
836
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
770
838
}
771
839
772
840
while(true){
777
845
}
778
846
779
847
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
848
buffer_capacity);
781
849
if(buffer_capacity == 0){
782
850
int e = errno;
783
perror("incbuffer");
851
perror_plus("incbuffer");
784
852
errno = e;
785
853
goto mandos_end;
786
854
}
810
878
}
811
879
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
880
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
814
882
gnutls_perror(ret);
815
883
errno = EPROTO;
816
884
goto mandos_end;
817
885
}
818
886
break;
819
887
default:
820
fprintf(stderr, "Unknown error while reading data from"
888
fprintf_plus(stderr, "Unknown error while reading data from"
821
889
" encrypted session with Mandos server\n");
822
890
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
891
errno = EIO;
829
897
}
830
898
831
899
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
900
fprintf_plus(stderr, "Closing TLS session\n");
833
901
}
834
902
835
903
if(quit_now){
847
915
848
916
if(buffer_length > 0){
849
917
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
918
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
852
919
&decrypted_buffer);
853
920
if(decrypted_buffer_size >= 0){
854
921
865
932
if(ret == 0 and ferror(stdout)){
866
933
int e = errno;
867
934
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
935
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
869
936
strerror(errno));
870
937
}
871
938
errno = e;
891
958
if(e == 0){
892
959
e = errno;
893
960
}
894
perror("close");
961
perror_plus("close");
895
962
}
896
963
gnutls_deinit(session);
964
errno = e;
897
965
if(quit_now){
898
e = EINTR;
966
errno = EINTR;
899
967
retval = -1;
900
968
}
901
errno = e;
902
969
}
903
970
return retval;
904
971
}
929
996
switch(event){
930
997
default:
931
998
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
1001
avahi_strerror(avahi_server_errno(mc.server)));
935
1002
break;
939
1006
char ip[AVAHI_ADDRESS_STR_MAX];
940
1007
avahi_address_snprint(ip, sizeof(ip), address);
941
1008
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1009
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
1011
ip, (intmax_t)interface, port);
945
1012
}
947
1014
avahi_proto_to_af(proto));
948
1015
if(ret == 0){
949
1016
avahi_simple_poll_quit(mc.simple_poll);
1017
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
950
1020
}
951
1021
}
952
1022
}
976
1046
default:
977
1047
case AVAHI_BROWSER_FAILURE:
978
1048
979
fprintf(stderr, "(Avahi browser) %s\n",
1049
fprintf_plus(stderr, "(Avahi browser) %s\n",
980
1050
avahi_strerror(avahi_server_errno(mc.server)));
981
1051
avahi_simple_poll_quit(mc.simple_poll);
982
1052
return;
990
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
1061
name, type, domain, protocol, 0,
992
1062
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
995
1065
break;
996
1066
1000
1070
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1071
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1072
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
1004
1074
}
1005
1075
break;
1006
1076
}
1007
1077
}
1008
1078
1009
/* stop main loop after sigterm has been called */
1079
/* Signal handler that stops main loop after SIGTERM */
1010
1080
static void handle_sigterm(int sig){
1011
1081
if(quit_now){
1012
1082
return;
1014
1084
quit_now = 1;
1015
1085
signal_received = sig;
1016
1086
int old_errno = errno;
1087
/* set main loop to exit */
1017
1088
if(mc.simple_poll != NULL){
1018
1089
avahi_simple_poll_quit(mc.simple_poll);
1019
1090
}
1020
1091
errno = old_errno;
1021
1092
}
1022
1093
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){
1105
if(debug){
1106
perror_plus("ioctl SIOCGIFFLAGS");
1107
}
1108
return false;
1109
}
1110
return true;
1111
}
1112
1113
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1115
/* Reject the loopback device */
1116
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1119
}
1120
return false;
1121
}
1122
/* Accept point-to-point devices only if connect_to is specified */
1123
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1126
}
1127
return true;
1128
}
1129
/* 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
1144
/* Accept this device */
1145
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
}
1355
}
1356
1023
1357
int main(int argc, char *argv[]){
1024
1358
AvahiSServiceBrowser *sb = NULL;
1025
1359
int error;
1027
1361
intmax_t tmpmax;
1028
1362
char *tmp;
1029
1363
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1364
const char *interface = "";
1031
1365
struct ifreq network;
1032
1366
int sd = -1;
1033
1367
bool take_down_interface = false;
1034
1368
uid_t uid;
1035
1369
gid_t gid;
1036
char *connect_to = NULL;
1037
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1371
bool tempdir_created = false;
1039
1372
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1043
1376
bool gnutls_initialized = false;
1044
1377
bool gpgme_initialized = false;
1045
1378
float delay = 2.5f;
1379
double retry_interval = 10; /* 10s between trying a server and
1380
retrying the same server again */
1046
1381
1047
1382
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1383
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1389
errno = 0;
1055
1390
ret = setgid(gid);
1056
1391
if(ret == -1){
1057
perror("setgid");
1392
perror_plus("setgid");
1058
1393
}
1059
1394
1060
1395
/* Lower user privileges (temporarily) */
1061
1396
errno = 0;
1062
1397
ret = seteuid(uid);
1063
1398
if(ret == -1){
1064
perror("seteuid");
1399
perror_plus("seteuid");
1065
1400
}
1066
1401
1067
1402
if(quit_now){
1102
1437
.arg = "SECONDS",
1103
1438
.doc = "Maximum delay to wait for interface startup",
1104
1439
.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 },
1105
1448
/*
1106
1449
* These reproduce what we would get without ARGP_NO_HELP
1107
1450
*/
1151
1494
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1495
argp_error(state, "Bad delay");
1153
1496
}
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;
1154
1508
break;
1155
1509
/*
1156
1510
* These reproduce what we would get without ARGP_NO_HELP
1163
1517
argp_state_help(state, state->out_stream,
1164
1518
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1519
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
1522
exit(argp_err_exit_status);
1168
1523
break;
1169
1524
default:
1184
1539
case ENOMEM:
1185
1540
default:
1186
1541
errno = ret;
1187
perror("argp_parse");
1542
perror_plus("argp_parse");
1188
1543
exitcode = EX_OSERR;
1189
1544
goto end;
1190
1545
case EINVAL:
1192
1547
goto end;
1193
1548
}
1194
1549
}
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
}
1195
1706
1196
1707
if(not debug){
1197
1708
avahi_set_log_function(empty_log);
1198
1709
}
1199
1710
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
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
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
1200
1743
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1744
from the signal handler */
1202
1745
/* Initialize the pseudo-RNG for Avahi */
1203
1746
srand((unsigned int) time(NULL));
1204
1747
mc.simple_poll = avahi_simple_poll_new();
1205
1748
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
1207
1750
exitcode = EX_UNAVAILABLE;
1208
1751
goto end;
1209
1752
}
1211
1754
sigemptyset(&sigterm_action.sa_mask);
1212
1755
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
1756
if(ret == -1){
1214
perror("sigaddset");
1757
perror_plus("sigaddset");
1215
1758
exitcode = EX_OSERR;
1216
1759
goto end;
1217
1760
}
1218
1761
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
1762
if(ret == -1){
1220
perror("sigaddset");
1763
perror_plus("sigaddset");
1221
1764
exitcode = EX_OSERR;
1222
1765
goto end;
1223
1766
}
1224
1767
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
1768
if(ret == -1){
1226
perror("sigaddset");
1769
perror_plus("sigaddset");
1227
1770
exitcode = EX_OSERR;
1228
1771
goto end;
1229
1772
}
1233
1776
*/
1234
1777
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
1778
if(ret == -1){
1236
perror("sigaction");
1779
perror_plus("sigaction");
1237
1780
return EX_OSERR;
1238
1781
}
1239
1782
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
1783
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
1784
if(ret == -1){
1242
perror("sigaction");
1785
perror_plus("sigaction");
1243
1786
exitcode = EX_OSERR;
1244
1787
goto end;
1245
1788
}
1246
1789
}
1247
1790
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
1791
if(ret == -1){
1249
perror("sigaction");
1792
perror_plus("sigaction");
1250
1793
return EX_OSERR;
1251
1794
}
1252
1795
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
1796
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
1797
if(ret == -1){
1255
perror("sigaction");
1798
perror_plus("sigaction");
1256
1799
exitcode = EX_OSERR;
1257
1800
goto end;
1258
1801
}
1259
1802
}
1260
1803
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
1804
if(ret == -1){
1262
perror("sigaction");
1805
perror_plus("sigaction");
1263
1806
return EX_OSERR;
1264
1807
}
1265
1808
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
1809
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
1810
if(ret == -1){
1268
perror("sigaction");
1811
perror_plus("sigaction");
1269
1812
exitcode = EX_OSERR;
1270
1813
goto end;
1271
1814
}
1272
1815
}
1273
1816
1274
1817
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1818
if(strcmp(interface, "none") != 0){
1276
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
1820
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1279
1822
exitcode = EX_UNAVAILABLE;
1280
1823
goto end;
1281
1824
}
1288
1831
errno = 0;
1289
1832
ret = seteuid(0);
1290
1833
if(ret == -1){
1291
perror("seteuid");
1834
perror_plus("seteuid");
1292
1835
}
1293
1836
1294
1837
#ifdef __linux__
1298
1841
bool restore_loglevel = true;
1299
1842
if(ret == -1){
1300
1843
restore_loglevel = false;
1301
perror("klogctl");
1844
perror_plus("klogctl");
1302
1845
}
1303
1846
#endif /* __linux__ */
1304
1847
1305
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
1849
if(sd < 0){
1307
perror("socket");
1850
perror_plus("socket");
1308
1851
exitcode = EX_OSERR;
1309
1852
#ifdef __linux__
1310
1853
if(restore_loglevel){
1311
1854
ret = klogctl(7, NULL, 0);
1312
1855
if(ret == -1){
1313
perror("klogctl");
1856
perror_plus("klogctl");
1314
1857
}
1315
1858
}
1316
1859
#endif /* __linux__ */
1318
1861
errno = 0;
1319
1862
ret = seteuid(uid);
1320
1863
if(ret == -1){
1321
perror("seteuid");
1864
perror_plus("seteuid");
1322
1865
}
1323
1866
goto end;
1324
1867
}
1325
1868
strcpy(network.ifr_name, interface);
1326
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
1870
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1871
perror_plus("ioctl SIOCGIFFLAGS");
1329
1872
#ifdef __linux__
1330
1873
if(restore_loglevel){
1331
1874
ret = klogctl(7, NULL, 0);
1332
1875
if(ret == -1){
1333
perror("klogctl");
1876
perror_plus("klogctl");
1334
1877
}
1335
1878
}
1336
1879
#endif /* __linux__ */
1339
1882
errno = 0;
1340
1883
ret = seteuid(uid);
1341
1884
if(ret == -1){
1342
perror("seteuid");
1885
perror_plus("seteuid");
1343
1886
}
1344
1887
goto end;
1345
1888
}
1349
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
1893
if(ret == -1){
1351
1894
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1353
1896
exitcode = EX_OSERR;
1354
1897
#ifdef __linux__
1355
1898
if(restore_loglevel){
1356
1899
ret = klogctl(7, NULL, 0);
1357
1900
if(ret == -1){
1358
perror("klogctl");
1901
perror_plus("klogctl");
1359
1902
}
1360
1903
}
1361
1904
#endif /* __linux__ */
1363
1906
errno = 0;
1364
1907
ret = seteuid(uid);
1365
1908
if(ret == -1){
1366
perror("seteuid");
1909
perror_plus("seteuid");
1367
1910
}
1368
1911
goto end;
1369
1912
}
1370
1913
}
1371
/* sleep checking until interface is running */
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1372
1916
for(int i=0; i < delay * 4; i++){
1373
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
1918
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1919
perror_plus("ioctl SIOCGIFFLAGS");
1376
1920
} else if(network.ifr_flags & IFF_RUNNING){
1377
1921
break;
1378
1922
}
1379
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
1924
ret = nanosleep(&sleeptime, NULL);
1381
1925
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1926
perror_plus("nanosleep");
1383
1927
}
1384
1928
}
1385
1929
if(not take_down_interface){
1386
1930
/* We won't need the socket anymore */
1387
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
1932
if(ret == -1){
1389
perror("close");
1933
perror_plus("close");
1390
1934
}
1391
1935
}
1392
1936
#ifdef __linux__
1394
1938
/* Restores kernel loglevel to default */
1395
1939
ret = klogctl(7, NULL, 0);
1396
1940
if(ret == -1){
1397
perror("klogctl");
1941
perror_plus("klogctl");
1398
1942
}
1399
1943
}
1400
1944
#endif /* __linux__ */
1404
1948
/* Lower privileges */
1405
1949
ret = seteuid(uid);
1406
1950
if(ret == -1){
1407
perror("seteuid");
1951
perror_plus("seteuid");
1408
1952
}
1409
1953
} else {
1410
1954
/* Lower privileges permanently */
1411
1955
ret = setuid(uid);
1412
1956
if(ret == -1){
1413
perror("setuid");
1957
perror_plus("setuid");
1414
1958
}
1415
1959
}
1416
1960
}
1421
1965
1422
1966
ret = init_gnutls_global(pubkey, seckey);
1423
1967
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
1968
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
1969
exitcode = EX_UNAVAILABLE;
1426
1970
goto end;
1427
1971
} else {
1432
1976
goto end;
1433
1977
}
1434
1978
1979
if(mkdtemp(tempdir) == NULL){
1980
perror_plus("mkdtemp");
1981
goto end;
1982
}
1435
1983
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
1984
1442
1985
if(quit_now){
1443
1986
goto end;
1444
1987
}
1445
1988
1446
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
1990
fprintf_plus(stderr, "init_gpgme failed\n");
1448
1991
exitcode = EX_UNAVAILABLE;
1449
1992
goto end;
1450
1993
} else {
1460
2003
/* (Mainly meant for debugging) */
1461
2004
char *address = strrchr(connect_to, ':');
1462
2005
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2006
fprintf_plus(stderr, "No colon in address\n");
1464
2007
exitcode = EX_USAGE;
1465
2008
goto end;
1466
2009
}
1474
2017
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2018
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
2019
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2020
fprintf_plus(stderr, "Bad port number\n");
1478
2021
exitcode = EX_USAGE;
1479
2022
goto end;
1480
2023
}
1485
2028
1486
2029
port = (uint16_t)tmpmax;
1487
2030
*address = '\0';
1488
address = connect_to;
1489
2031
/* Colon in address indicates IPv6 */
1490
2032
int af;
1491
if(strchr(address, ':') != NULL){
2033
if(strchr(connect_to, ':') != NULL){
1492
2034
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
}
1493
2041
} else {
1494
2042
af = AF_INET;
1495
2043
}
2044
address = connect_to;
1496
2045
1497
2046
if(quit_now){
1498
2047
goto end;
1499
2048
}
1500
2049
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2050
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
2052
if(quit_now or ret == 0){
2053
break;
2054
}
2055
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2057
}
2058
sleep((int)retry_interval);
2059
}
2060
2061
if (not quit_now){
1523
2062
exitcode = EXIT_SUCCESS;
1524
2063
}
2064
1525
2065
goto end;
1526
2066
}
1527
2067
1549
2089
1550
2090
/* Check if creating the Avahi server object succeeded */
1551
2091
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
2092
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
1553
2093
avahi_strerror(error));
1554
2094
exitcode = EX_UNAVAILABLE;
1555
2095
goto end;
1564
2104
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
2105
NULL, 0, browse_callback, NULL);
1566
2106
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
2107
fprintf_plus(stderr, "Failed to create service browser: %s\n",
1568
2108
avahi_strerror(avahi_server_errno(mc.server)));
1569
2109
exitcode = EX_UNAVAILABLE;
1570
2110
goto end;
1577
2117
/* Run the main loop */
1578
2118
1579
2119
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
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
}
1584
2129
1585
2130
end:
1586
2131
1587
2132
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2133
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2134
}
1590
2135
1591
2136
/* Cleanup things */
1607
2152
if(gpgme_initialized){
1608
2153
gpgme_release(mc.ctx);
1609
2154
}
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 */
1610
2168
1611
2169
/* Take down the network interface */
1612
2170
if(take_down_interface){
1614
2172
errno = 0;
1615
2173
ret = seteuid(0);
1616
2174
if(ret == -1){
1617
perror("seteuid");
2175
perror_plus("seteuid");
1618
2176
}
1619
2177
if(geteuid() == 0){
1620
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
2179
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
1624
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
2184
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1628
2186
}
1629
2187
}
1630
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
2189
if(ret == -1){
1632
perror("close");
2190
perror_plus("close");
1633
2191
}
1634
2192
/* Lower privileges permanently */
1635
2193
errno = 0;
1636
2194
ret = setuid(uid);
1637
2195
if(ret == -1){
1638
perror("setuid");
2196
perror_plus("setuid");
1639
2197
}
1640
2198
}
1641
2199
}
1642
2200
1643
/* Removes the temp directory used by GPGME */
2201
/* Removes the GPGME temp directory and all files inside */
1644
2202
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
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];
1665
2210
char *fullname = NULL;
1666
2211
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2212
direntry->d_name);
1668
2213
if(ret < 0){
1669
perror("asprintf");
2214
perror_plus("asprintf");
1670
2215
continue;
1671
2216
}
1672
2217
ret = remove(fullname);
1673
2218
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
1676
2220
}
1677
2221
free(fullname);
1678
2222
}
1679
closedir(d);
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");
1680
2229
}
1681
2230
ret = rmdir(tempdir);
1682
2231
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2232
perror_plus("rmdir");
1684
2233
}
1685
2234
}
1686
2235
1691
2240
&old_sigterm_action,
1692
2241
NULL));
1693
2242
if(ret == -1){
1694
perror("sigaction");
2243
perror_plus("sigaction");
1695
2244
}
1696
2245
do {
1697
2246
ret = raise(signal_received);
1698
2247
} while(ret != 0 and errno == EINTR);
1699
2248
if(ret != 0){
1700
perror("raise");
2249
perror_plus("raise");
1701
2250
abort();
1702
2251
}
1703
2252
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0