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- Committer: Teddy Hogeborn
- Date: 2009-11-03 00:12:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20091103001235-op9jfvtx6xvxch3h
* README (FAQ): Fix typo.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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 */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
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>";
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;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
130
149
131
/* Used for passing in values through the Avahi callback functions */
150
132
typedef struct {
155
137
gnutls_dh_params_t dh_params;
156
138
const char *priority;
157
139
gpgme_ctx_t ctx;
158
server *current_server;
159
140
} mandos_context;
160
141
161
142
/* global context so signal handler can reach it*/
162
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
144
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
166
146
167
147
sig_atomic_t quit_now = 0;
168
148
int signal_received = 0;
169
149
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
150
/*
186
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
152
* bytes. "buffer_capacity" is how much is currently allocated,
188
153
* "buffer_length" is how much is already used.
189
154
*/
190
155
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
156
size_t buffer_capacity){
192
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
193
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
159
if(buffer == NULL){
199
164
return buffer_capacity;
200
165
}
201
166
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
167
/*
240
168
* Initialize GPGME.
241
169
*/
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
244
172
gpgme_error_t rc;
245
173
gpgme_engine_info_t engine_info;
246
174
255
183
256
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
185
if(fd == -1){
258
perror_plus("open");
186
perror("open");
259
187
return false;
260
188
}
261
189
262
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
191
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
193
gpgme_strsource(rc), gpgme_strerror(rc));
267
194
return false;
268
195
}
269
196
270
197
rc = gpgme_op_import(mc.ctx, pgp_data);
271
198
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
274
200
gpgme_strsource(rc), gpgme_strerror(rc));
275
201
return false;
276
202
}
277
203
278
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
205
if(ret == -1){
280
perror_plus("close");
206
perror("close");
281
207
}
282
208
gpgme_data_release(pgp_data);
283
209
return true;
284
210
}
285
211
286
212
if(debug){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
289
214
}
290
215
291
216
/* Init GPGME */
292
217
gpgme_check_version(NULL);
293
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
294
219
if(rc != GPG_ERR_NO_ERROR){
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
297
221
gpgme_strsource(rc), gpgme_strerror(rc));
298
222
return false;
299
223
}
300
224
301
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
302
226
rc = gpgme_get_engine_info(&engine_info);
303
227
if(rc != GPG_ERR_NO_ERROR){
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
229
gpgme_strsource(rc), gpgme_strerror(rc));
307
230
return false;
308
231
}
315
238
engine_info = engine_info->next;
316
239
}
317
240
if(engine_info == NULL){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
242
return false;
321
243
}
322
244
323
245
/* Create new GPGME "context" */
324
246
rc = gpgme_new(&(mc.ctx));
325
247
if(rc != GPG_ERR_NO_ERROR){
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
329
250
return false;
330
251
}
331
252
350
271
ssize_t plaintext_length = 0;
351
272
352
273
if(debug){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
275
}
356
276
357
277
/* Create new GPGME data buffer from memory cryptotext */
358
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
279
0);
360
280
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
282
gpgme_strsource(rc), gpgme_strerror(rc));
364
283
return -1;
365
284
}
367
286
/* Create new empty GPGME data buffer for the plaintext */
368
287
rc = gpgme_data_new(&dh_plain);
369
288
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
372
290
gpgme_strsource(rc), gpgme_strerror(rc));
373
291
gpgme_data_release(dh_crypto);
374
292
return -1;
378
296
data buffer */
379
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
298
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
300
gpgme_strsource(rc), gpgme_strerror(rc));
384
301
plaintext_length = -1;
385
302
if(debug){
386
303
gpgme_decrypt_result_t result;
387
304
result = gpgme_op_decrypt_result(mc.ctx);
388
305
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
391
307
} else {
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
308
fprintf(stderr, "Unsupported algorithm: %s\n",
394
309
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
310
fprintf(stderr, "Wrong key usage: %u\n",
397
311
result->wrong_key_usage);
398
312
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
401
314
}
402
315
gpgme_recipient_t recipient;
403
316
recipient = result->recipients;
404
317
while(recipient != NULL){
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
318
fprintf(stderr, "Public key algorithm: %s\n",
407
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
412
322
recipient->status == GPG_ERR_NO_SECKEY
413
323
? "No" : "Yes");
414
324
recipient = recipient->next;
419
329
}
420
330
421
331
if(debug){
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
424
333
}
425
334
426
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
427
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
428
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
429
338
plaintext_length = -1;
430
339
goto decrypt_end;
431
340
}
433
342
*plaintext = NULL;
434
343
while(true){
435
344
plaintext_capacity = incbuffer(plaintext,
436
(size_t)plaintext_length,
437
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
438
347
if(plaintext_capacity == 0){
439
perror_plus("incbuffer");
440
plaintext_length = -1;
441
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
442
351
}
443
352
444
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
449
358
break;
450
359
}
451
360
if(ret < 0){
452
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
453
362
plaintext_length = -1;
454
363
goto decrypt_end;
455
364
}
457
366
}
458
367
459
368
if(debug){
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
462
370
for(ssize_t i = 0; i < plaintext_length; i++){
463
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
464
372
}
486
394
/* GnuTLS log function callback */
487
395
static void debuggnutls(__attribute__((unused)) int level,
488
396
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
490
398
}
491
399
492
400
static int init_gnutls_global(const char *pubkeyfilename,
494
402
int ret;
495
403
496
404
if(debug){
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
499
406
}
500
407
501
408
ret = gnutls_global_init();
502
409
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
505
412
return -1;
506
413
}
507
414
514
421
}
515
422
516
423
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
518
425
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
521
431
gnutls_global_deinit();
522
432
return -1;
523
433
}
524
434
525
435
if(debug){
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
528
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
438
seckeyfilename);
530
439
}
534
443
GNUTLS_OPENPGP_FMT_BASE64);
535
444
if(ret != GNUTLS_E_SUCCESS){
536
445
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
542
450
goto globalfail;
543
451
}
544
452
545
453
/* GnuTLS server initialization */
546
454
ret = gnutls_dh_params_init(&mc.dh_params);
547
455
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
550
457
" %s\n", safer_gnutls_strerror(ret));
551
458
goto globalfail;
552
459
}
553
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
554
461
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
557
463
safer_gnutls_strerror(ret));
558
464
goto globalfail;
559
465
}
580
486
}
581
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
582
488
if(ret != GNUTLS_E_SUCCESS){
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
585
490
safer_gnutls_strerror(ret));
586
491
}
587
492
595
500
}
596
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
502
if(ret != GNUTLS_E_SUCCESS){
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
602
506
gnutls_deinit(*session);
603
507
return -1;
604
508
}
613
517
}
614
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
615
519
if(ret != GNUTLS_E_SUCCESS){
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
618
521
safer_gnutls_strerror(ret));
619
522
gnutls_deinit(*session);
620
523
return -1;
666
569
pf = PF_INET;
667
570
break;
668
571
default:
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
671
573
errno = EINVAL;
672
574
return -1;
673
575
}
678
580
}
679
581
680
582
if(debug){
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
683
584
"\n", ip, port);
684
585
}
685
586
686
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
687
588
if(tcp_sd < 0){
688
589
int e = errno;
689
perror_plus("socket");
590
perror("socket");
690
591
errno = e;
691
592
goto mandos_end;
692
593
}
706
607
}
707
608
if(ret < 0 ){
708
609
int e = errno;
709
perror_plus("inet_pton");
610
perror("inet_pton");
710
611
errno = e;
711
612
goto mandos_end;
712
613
}
713
614
if(ret == 0){
714
615
int e = errno;
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
717
617
errno = e;
718
618
goto mandos_end;
719
619
}
724
624
725
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
627
-Wunreachable-code*/
728
628
if(if_index == AVAHI_IF_UNSPEC){
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
731
630
" without a network interface\n");
732
631
errno = EINVAL;
733
632
goto mandos_end;
750
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
751
650
char interface[IF_NAMESIZE];
752
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
perror_plus("if_indextoname");
652
perror("if_indextoname");
754
653
} else {
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
757
655
ip, interface, port);
758
656
}
759
657
} else {
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
762
660
}
763
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
771
669
sizeof(addrstr));
772
670
}
773
671
if(pcret == NULL){
774
perror_plus("inet_ntop");
672
perror("inet_ntop");
775
673
} else {
776
674
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
779
676
}
780
677
}
781
678
}
791
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
792
689
}
793
690
if(ret < 0){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
795
int e = errno;
796
perror_plus("connect");
797
errno = e;
798
}
691
int e = errno;
692
perror("connect");
693
errno = e;
799
694
goto mandos_end;
800
695
}
801
696
809
704
while(true){
810
705
size_t out_size = strlen(out);
811
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
812
out_size - written));
707
out_size - written));
813
708
if(ret == -1){
814
709
int e = errno;
815
perror_plus("write");
710
perror("write");
816
711
errno = e;
817
712
goto mandos_end;
818
713
}
835
730
}
836
731
837
732
if(debug){
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
840
734
}
841
735
842
736
if(quit_now){
844
738
goto mandos_end;
845
739
}
846
740
847
/* Spurious warning from -Wint-to-pointer-cast */
848
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
849
742
850
743
if(quit_now){
862
755
863
756
if(ret != GNUTLS_E_SUCCESS){
864
757
if(debug){
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
867
759
gnutls_perror(ret);
868
760
}
869
761
errno = EPROTO;
873
765
/* Read OpenPGP packet that contains the wanted password */
874
766
875
767
if(debug){
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
878
770
}
879
771
880
772
while(true){
885
777
}
886
778
887
779
buffer_capacity = incbuffer(&buffer, buffer_length,
888
buffer_capacity);
780
buffer_capacity);
889
781
if(buffer_capacity == 0){
890
782
int e = errno;
891
perror_plus("incbuffer");
783
perror("incbuffer");
892
784
errno = e;
893
785
goto mandos_end;
894
786
}
918
810
}
919
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
920
812
if(ret < 0){
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
923
814
gnutls_perror(ret);
924
815
errno = EPROTO;
925
816
goto mandos_end;
926
817
}
927
818
break;
928
819
default:
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
820
fprintf(stderr, "Unknown error while reading data from"
931
821
" encrypted session with Mandos server\n");
932
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
933
823
errno = EIO;
939
829
}
940
830
941
831
if(debug){
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
944
833
}
945
834
946
835
if(quit_now){
958
847
959
848
if(buffer_length > 0){
960
849
ssize_t decrypted_buffer_size;
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
962
852
&decrypted_buffer);
963
853
if(decrypted_buffer_size >= 0){
964
854
975
865
if(ret == 0 and ferror(stdout)){
976
866
int e = errno;
977
867
if(debug){
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
868
fprintf(stderr, "Error writing encrypted data: %s\n",
980
869
strerror(errno));
981
870
}
982
871
errno = e;
1002
891
if(e == 0){
1003
892
e = errno;
1004
893
}
1005
perror_plus("close");
894
perror("close");
1006
895
}
1007
896
gnutls_deinit(session);
1008
errno = e;
1009
897
if(quit_now){
1010
errno = EINTR;
898
e = EINTR;
1011
899
retval = -1;
1012
900
}
901
errno = e;
1013
902
}
1014
903
return retval;
1015
904
}
1040
929
switch(event){
1041
930
default:
1042
931
case AVAHI_RESOLVER_FAILURE:
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1045
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
934
avahi_strerror(avahi_server_errno(mc.server)));
1047
935
break;
1051
939
char ip[AVAHI_ADDRESS_STR_MAX];
1052
940
avahi_address_snprint(ip, sizeof(ip), address);
1053
941
if(debug){
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1056
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
944
ip, (intmax_t)interface, port);
1058
945
}
1060
947
avahi_proto_to_af(proto));
1061
948
if(ret == 0){
1062
949
avahi_simple_poll_quit(mc.simple_poll);
1063
} else {
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1066
950
}
1067
951
}
1068
952
}
1092
976
default:
1093
977
case AVAHI_BROWSER_FAILURE:
1094
978
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
979
fprintf(stderr, "(Avahi browser) %s\n",
1097
980
avahi_strerror(avahi_server_errno(mc.server)));
1098
981
avahi_simple_poll_quit(mc.simple_poll);
1099
982
return;
1107
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
991
name, type, domain, protocol, 0,
1109
992
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1112
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1113
995
break;
1114
996
1118
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1119
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1120
1002
if(debug){
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1123
1004
}
1124
1005
break;
1125
1006
}
1126
1007
}
1127
1008
1128
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1129
1010
static void handle_sigterm(int sig){
1130
1011
if(quit_now){
1131
1012
return;
1133
1014
quit_now = 1;
1134
1015
signal_received = sig;
1135
1016
int old_errno = errno;
1136
/* set main loop to exit */
1137
1017
if(mc.simple_poll != NULL){
1138
1018
avahi_simple_poll_quit(mc.simple_poll);
1139
1019
}
1140
1020
errno = old_errno;
1141
1021
}
1142
1022
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1144
int ret;
1145
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1147
if(s < 0){
1148
perror_plus("socket");
1149
return false;
1150
}
1151
strcpy(ifr->ifr_name, ifname);
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1153
if(ret == -1){
1154
if(debug){
1155
perror_plus("ioctl SIOCGIFFLAGS");
1156
}
1157
return false;
1158
}
1159
return true;
1160
}
1161
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1163
1164
/* Reject the loopback device */
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1166
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1169
}
1170
return false;
1171
}
1172
/* Accept point-to-point devices only if connect_to is specified */
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1174
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1177
}
1178
return true;
1179
}
1180
/* Otherwise, reject non-broadcast-capable devices */
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1182
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1185
}
1186
return false;
1187
}
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
if(ifr->ifr_flags & IFF_NOARP){
1190
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1193
}
1194
return false;
1195
}
1196
1197
/* Accept this device */
1198
if(debug){
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1201
}
1202
return true;
1203
}
1204
1205
/*
1206
* This function determines if a directory entry in /sys/class/net
1207
* corresponds to an acceptable network device.
1208
* (This function is passed to scandir(3) as a filter function.)
1209
*/
1210
int good_interface(const struct dirent *if_entry){
1211
if(if_entry->d_name[0] == '.'){
1212
return 0;
1213
}
1214
1215
struct ifreq ifr;
1216
if(not get_flags(if_entry->d_name, &ifr)){
1217
if(debug){
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
int notdotentries(const struct dirent *direntry){
1278
/* Skip "." and ".." */
1279
if(direntry->d_name[0] == '.'
1280
and (direntry->d_name[1] == '\0'
1281
or (direntry->d_name[1] == '.'
1282
and direntry->d_name[2] == '\0'))){
1283
return 0;
1284
}
1285
return 1;
1286
}
1287
1288
/* Is this directory entry a runnable program? */
1289
int runnable_hook(const struct dirent *direntry){
1290
int ret;
1291
size_t sret;
1292
struct stat st;
1293
1294
if((direntry->d_name)[0] == '\0'){
1295
/* Empty name? */
1296
return 0;
1297
}
1298
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1300
"abcdefghijklmnopqrstuvwxyz"
1301
"0123456789"
1302
"_-");
1303
if((direntry->d_name)[sret] != '\0'){
1304
/* Contains non-allowed characters */
1305
if(debug){
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1312
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1321
if(ret == -1){
1322
if(debug){
1323
perror_plus("Could not stat hook");
1324
}
1325
return 0;
1326
}
1327
if(not (S_ISREG(st.st_mode))){
1328
/* Not a regular file */
1329
if(debug){
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1333
}
1334
return 0;
1335
}
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
/* Not executable */
1338
if(debug){
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
return 1;
1346
}
1347
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1349
int ret;
1350
struct timespec now;
1351
struct timespec waited_time;
1352
intmax_t block_time;
1353
1354
while(true){
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1359
}
1360
ret = avahi_simple_poll_iterate(s, -1);
1361
} else {
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1366
}
1367
/* the current time */
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
if(ret == -1){
1370
perror_plus("clock_gettime");
1371
return -1;
1372
}
1373
/* Calculating in ms how long time between now and server
1374
who we visted longest time ago. Now - last seen. */
1375
waited_time.tv_sec = (now.tv_sec
1376
- mc.current_server->last_seen.tv_sec);
1377
waited_time.tv_nsec = (now.tv_nsec
1378
- mc.current_server->last_seen.tv_nsec);
1379
/* total time is 10s/10,000ms.
1380
Converting to s from ms by dividing by 1,000,
1381
and ns to ms by dividing by 1,000,000. */
1382
block_time = ((retry_interval
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1385
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1389
}
1390
1391
if(block_time <= 0){
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1396
if(ret == 0){
1397
avahi_simple_poll_quit(mc.simple_poll);
1398
return 0;
1399
}
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1401
&mc.current_server->last_seen);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
mc.current_server = mc.current_server->next;
1407
block_time = 0; /* Call avahi to find new Mandos
1408
servers, but don't block */
1409
}
1410
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1412
}
1413
if(ret != 0){
1414
if (ret > 0 or errno != EINTR){
1415
return (ret != 1) ? ret : 0;
1416
}
1417
}
1418
}
1419
}
1420
1421
1023
int main(int argc, char *argv[]){
1422
1024
AvahiSServiceBrowser *sb = NULL;
1423
1025
int error;
1425
1027
intmax_t tmpmax;
1426
1028
char *tmp;
1427
1029
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
1030
const char *interface = "eth0";
1429
1031
struct ifreq network;
1430
1032
int sd = -1;
1431
1033
bool take_down_interface = false;
1432
1034
uid_t uid;
1433
1035
gid_t gid;
1036
char *connect_to = NULL;
1434
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1435
1038
bool tempdir_created = false;
1436
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1440
1043
bool gnutls_initialized = false;
1441
1044
bool gpgme_initialized = false;
1442
1045
float delay = 2.5f;
1443
double retry_interval = 10; /* 10s between trying a server and
1444
retrying the same server again */
1445
1046
1446
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1447
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1453
1054
errno = 0;
1454
1055
ret = setgid(gid);
1455
1056
if(ret == -1){
1456
perror_plus("setgid");
1057
perror("setgid");
1457
1058
}
1458
1059
1459
1060
/* Lower user privileges (temporarily) */
1460
1061
errno = 0;
1461
1062
ret = seteuid(uid);
1462
1063
if(ret == -1){
1463
perror_plus("seteuid");
1064
perror("seteuid");
1464
1065
}
1465
1066
1466
1067
if(quit_now){
1501
1102
.arg = "SECONDS",
1502
1103
.doc = "Maximum delay to wait for interface startup",
1503
1104
.group = 2 },
1504
{ .name = "retry", .key = 132,
1505
.arg = "SECONDS",
1506
.doc = "Retry interval used when denied by the mandos server",
1507
.group = 2 },
1508
{ .name = "network-hook-dir", .key = 133,
1509
.arg = "DIR",
1510
.doc = "Directory where network hooks are located",
1511
.group = 2 },
1512
1105
/*
1513
1106
* These reproduce what we would get without ARGP_NO_HELP
1514
1107
*/
1558
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1559
1152
argp_error(state, "Bad delay");
1560
1153
}
1561
case 132: /* --retry */
1562
errno = 0;
1563
retry_interval = strtod(arg, &tmp);
1564
if(errno != 0 or tmp == arg or *tmp != '\0'
1565
or (retry_interval * 1000) > INT_MAX
1566
or retry_interval < 0){
1567
argp_error(state, "Bad retry interval");
1568
}
1569
break;
1570
case 133: /* --network-hook-dir */
1571
hookdir = arg;
1572
1154
break;
1573
1155
/*
1574
1156
* These reproduce what we would get without ARGP_NO_HELP
1581
1163
argp_state_help(state, state->out_stream,
1582
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1583
1165
case 'V': /* --version */
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1586
1167
exit(argp_err_exit_status);
1587
1168
break;
1603
1184
case ENOMEM:
1604
1185
default:
1605
1186
errno = ret;
1606
perror_plus("argp_parse");
1187
perror("argp_parse");
1607
1188
exitcode = EX_OSERR;
1608
1189
goto end;
1609
1190
case EINVAL:
1611
1192
goto end;
1612
1193
}
1613
1194
}
1614
1615
{
1616
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
1683
} else {
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
1772
}
1773
1195
1774
1196
if(not debug){
1775
1197
avahi_set_log_function(empty_log);
1776
1198
}
1777
1199
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
1812
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
1201
from the signal handler */
1814
1202
/* Initialize the pseudo-RNG for Avahi */
1815
1203
srand((unsigned int) time(NULL));
1816
1204
mc.simple_poll = avahi_simple_poll_new();
1817
1205
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1820
1207
exitcode = EX_UNAVAILABLE;
1821
1208
goto end;
1822
1209
}
1824
1211
sigemptyset(&sigterm_action.sa_mask);
1825
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1826
1213
if(ret == -1){
1827
perror_plus("sigaddset");
1214
perror("sigaddset");
1828
1215
exitcode = EX_OSERR;
1829
1216
goto end;
1830
1217
}
1831
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1832
1219
if(ret == -1){
1833
perror_plus("sigaddset");
1220
perror("sigaddset");
1834
1221
exitcode = EX_OSERR;
1835
1222
goto end;
1836
1223
}
1837
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1838
1225
if(ret == -1){
1839
perror_plus("sigaddset");
1226
perror("sigaddset");
1840
1227
exitcode = EX_OSERR;
1841
1228
goto end;
1842
1229
}
1846
1233
*/
1847
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1848
1235
if(ret == -1){
1849
perror_plus("sigaction");
1236
perror("sigaction");
1850
1237
return EX_OSERR;
1851
1238
}
1852
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1854
1241
if(ret == -1){
1855
perror_plus("sigaction");
1242
perror("sigaction");
1856
1243
exitcode = EX_OSERR;
1857
1244
goto end;
1858
1245
}
1859
1246
}
1860
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1861
1248
if(ret == -1){
1862
perror_plus("sigaction");
1249
perror("sigaction");
1863
1250
return EX_OSERR;
1864
1251
}
1865
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1867
1254
if(ret == -1){
1868
perror_plus("sigaction");
1255
perror("sigaction");
1869
1256
exitcode = EX_OSERR;
1870
1257
goto end;
1871
1258
}
1872
1259
}
1873
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1874
1261
if(ret == -1){
1875
perror_plus("sigaction");
1262
perror("sigaction");
1876
1263
return EX_OSERR;
1877
1264
}
1878
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1880
1267
if(ret == -1){
1881
perror_plus("sigaction");
1268
perror("sigaction");
1882
1269
exitcode = EX_OSERR;
1883
1270
goto end;
1884
1271
}
1885
1272
}
1886
1273
1887
1274
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1275
if(interface[0] != '\0'){
1889
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
1277
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1893
1279
exitcode = EX_UNAVAILABLE;
1894
1280
goto end;
1895
1281
}
1902
1288
errno = 0;
1903
1289
ret = seteuid(0);
1904
1290
if(ret == -1){
1905
perror_plus("seteuid");
1291
perror("seteuid");
1906
1292
}
1907
1293
1908
1294
#ifdef __linux__
1912
1298
bool restore_loglevel = true;
1913
1299
if(ret == -1){
1914
1300
restore_loglevel = false;
1915
perror_plus("klogctl");
1301
perror("klogctl");
1916
1302
}
1917
1303
#endif /* __linux__ */
1918
1304
1919
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
1306
if(sd < 0){
1921
perror_plus("socket");
1307
perror("socket");
1922
1308
exitcode = EX_OSERR;
1923
1309
#ifdef __linux__
1924
1310
if(restore_loglevel){
1925
1311
ret = klogctl(7, NULL, 0);
1926
1312
if(ret == -1){
1927
perror_plus("klogctl");
1313
perror("klogctl");
1928
1314
}
1929
1315
}
1930
1316
#endif /* __linux__ */
1932
1318
errno = 0;
1933
1319
ret = seteuid(uid);
1934
1320
if(ret == -1){
1935
perror_plus("seteuid");
1321
perror("seteuid");
1936
1322
}
1937
1323
goto end;
1938
1324
}
1939
1325
strcpy(network.ifr_name, interface);
1940
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
1327
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1328
perror("ioctl SIOCGIFFLAGS");
1943
1329
#ifdef __linux__
1944
1330
if(restore_loglevel){
1945
1331
ret = klogctl(7, NULL, 0);
1946
1332
if(ret == -1){
1947
perror_plus("klogctl");
1333
perror("klogctl");
1948
1334
}
1949
1335
}
1950
1336
#endif /* __linux__ */
1953
1339
errno = 0;
1954
1340
ret = seteuid(uid);
1955
1341
if(ret == -1){
1956
perror_plus("seteuid");
1342
perror("seteuid");
1957
1343
}
1958
1344
goto end;
1959
1345
}
1963
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
1350
if(ret == -1){
1965
1351
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1352
perror("ioctl SIOCSIFFLAGS");
1967
1353
exitcode = EX_OSERR;
1968
1354
#ifdef __linux__
1969
1355
if(restore_loglevel){
1970
1356
ret = klogctl(7, NULL, 0);
1971
1357
if(ret == -1){
1972
perror_plus("klogctl");
1358
perror("klogctl");
1973
1359
}
1974
1360
}
1975
1361
#endif /* __linux__ */
1977
1363
errno = 0;
1978
1364
ret = seteuid(uid);
1979
1365
if(ret == -1){
1980
perror_plus("seteuid");
1366
perror("seteuid");
1981
1367
}
1982
1368
goto end;
1983
1369
}
1984
1370
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1371
/* sleep checking until interface is running */
1987
1372
for(int i=0; i < delay * 4; i++){
1988
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
1374
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1375
perror("ioctl SIOCGIFFLAGS");
1991
1376
} else if(network.ifr_flags & IFF_RUNNING){
1992
1377
break;
1993
1378
}
1994
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
1380
ret = nanosleep(&sleeptime, NULL);
1996
1381
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1382
perror("nanosleep");
1998
1383
}
1999
1384
}
2000
1385
if(not take_down_interface){
2001
1386
/* We won't need the socket anymore */
2002
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
1388
if(ret == -1){
2004
perror_plus("close");
1389
perror("close");
2005
1390
}
2006
1391
}
2007
1392
#ifdef __linux__
2009
1394
/* Restores kernel loglevel to default */
2010
1395
ret = klogctl(7, NULL, 0);
2011
1396
if(ret == -1){
2012
perror_plus("klogctl");
1397
perror("klogctl");
2013
1398
}
2014
1399
}
2015
1400
#endif /* __linux__ */
2019
1404
/* Lower privileges */
2020
1405
ret = seteuid(uid);
2021
1406
if(ret == -1){
2022
perror_plus("seteuid");
1407
perror("seteuid");
2023
1408
}
2024
1409
} else {
2025
1410
/* Lower privileges permanently */
2026
1411
ret = setuid(uid);
2027
1412
if(ret == -1){
2028
perror_plus("setuid");
1413
perror("setuid");
2029
1414
}
2030
1415
}
2031
1416
}
2036
1421
2037
1422
ret = init_gnutls_global(pubkey, seckey);
2038
1423
if(ret == -1){
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2041
1425
exitcode = EX_UNAVAILABLE;
2042
1426
goto end;
2043
1427
} else {
2048
1432
goto end;
2049
1433
}
2050
1434
1435
tempdir_created = true;
2051
1436
if(mkdtemp(tempdir) == NULL){
2052
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2053
1439
goto end;
2054
1440
}
2055
tempdir_created = true;
2056
1441
2057
1442
if(quit_now){
2058
1443
goto end;
2059
1444
}
2060
1445
2061
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
1447
fprintf(stderr, "init_gpgme failed\n");
2064
1448
exitcode = EX_UNAVAILABLE;
2065
1449
goto end;
2066
1450
} else {
2076
1460
/* (Mainly meant for debugging) */
2077
1461
char *address = strrchr(connect_to, ':');
2078
1462
if(address == NULL){
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2081
1464
exitcode = EX_USAGE;
2082
1465
goto end;
2083
1466
}
2091
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2092
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2093
1476
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
1477
fprintf(stderr, "Bad port number\n");
2096
1478
exitcode = EX_USAGE;
2097
1479
goto end;
2098
1480
}
2103
1485
2104
1486
port = (uint16_t)tmpmax;
2105
1487
*address = '\0';
1488
address = connect_to;
2106
1489
/* Colon in address indicates IPv6 */
2107
1490
int af;
2108
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2109
1492
af = AF_INET6;
2110
/* Accept [] around IPv6 address - see RFC 5952 */
2111
if(connect_to[0] == '[' and address[-1] == ']')
2112
{
2113
connect_to++;
2114
address[-1] = '\0';
2115
}
2116
1493
} else {
2117
1494
af = AF_INET;
2118
1495
}
2119
address = connect_to;
2120
1496
2121
1497
if(quit_now){
2122
1498
goto end;
2123
1499
}
2124
1500
2125
while(not quit_now){
2126
ret = start_mandos_communication(address, port, if_index, af);
2127
if(quit_now or ret == 0){
2128
break;
2129
}
2130
if(debug){
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2133
}
2134
sleep((int)retry_interval);
2135
}
2136
2137
if (not quit_now){
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 {
2138
1523
exitcode = EXIT_SUCCESS;
2139
1524
}
2140
2141
1525
goto end;
2142
1526
}
2143
1527
2165
1549
2166
1550
/* Check if creating the Avahi server object succeeded */
2167
1551
if(mc.server == NULL){
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
2170
1553
avahi_strerror(error));
2171
1554
exitcode = EX_UNAVAILABLE;
2172
1555
goto end;
2181
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
1565
NULL, 0, browse_callback, NULL);
2183
1566
if(sb == NULL){
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
1567
fprintf(stderr, "Failed to create service browser: %s\n",
2186
1568
avahi_strerror(avahi_server_errno(mc.server)));
2187
1569
exitcode = EX_UNAVAILABLE;
2188
1570
goto end;
2195
1577
/* Run the main loop */
2196
1578
2197
1579
if(debug){
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2200
}
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2204
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2208
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2209
1584
2210
1585
end:
2211
1586
2212
1587
if(debug){
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2215
1589
}
2216
1590
2217
1591
/* Cleanup things */
2233
1607
if(gpgme_initialized){
2234
1608
gpgme_release(mc.ctx);
2235
1609
}
2236
2237
/* Cleans up the circular linked list of Mandos servers the client
2238
has seen */
2239
if(mc.current_server != NULL){
2240
mc.current_server->prev->next = NULL;
2241
while(mc.current_server != NULL){
2242
server *next = mc.current_server->next;
2243
free(mc.current_server);
2244
mc.current_server = next;
2245
}
2246
}
2247
2248
/* XXX run network hooks "stop" here */
2249
1610
2250
1611
/* Take down the network interface */
2251
1612
if(take_down_interface){
2253
1614
errno = 0;
2254
1615
ret = seteuid(0);
2255
1616
if(ret == -1){
2256
perror_plus("seteuid");
1617
perror("seteuid");
2257
1618
}
2258
1619
if(geteuid() == 0){
2259
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
1621
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
2263
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
1626
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1627
perror("ioctl SIOCSIFFLAGS");
2267
1628
}
2268
1629
}
2269
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
1631
if(ret == -1){
2271
perror_plus("close");
1632
perror("close");
2272
1633
}
2273
1634
/* Lower privileges permanently */
2274
1635
errno = 0;
2275
1636
ret = setuid(uid);
2276
1637
if(ret == -1){
2277
perror_plus("setuid");
1638
perror("setuid");
2278
1639
}
2279
1640
}
2280
1641
}
2281
1642
2282
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2283
1644
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
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
}
2291
1665
char *fullname = NULL;
2292
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
1667
direntry->d_name);
2294
1668
if(ret < 0){
2295
perror_plus("asprintf");
1669
perror("asprintf");
2296
1670
continue;
2297
1671
}
2298
1672
ret = remove(fullname);
2299
1673
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2302
1676
}
2303
1677
free(fullname);
2304
1678
}
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
1679
closedir(d);
2311
1680
}
2312
1681
ret = rmdir(tempdir);
2313
1682
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
1683
perror("rmdir");
2315
1684
}
2316
1685
}
2317
1686
2322
1691
&old_sigterm_action,
2323
1692
NULL));
2324
1693
if(ret == -1){
2325
perror_plus("sigaction");
1694
perror("sigaction");
2326
1695
}
2327
1696
do {
2328
1697
ret = raise(signal_received);
2329
1698
} while(ret != 0 and errno == EINTR);
2330
1699
if(ret != 0){
2331
perror_plus("raise");
1700
perror("raise");
2332
1701
abort();
2333
1702
}
2334
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0