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24.1.158
(compared to revision 237.22.4)
: plugins.d/mandos-client.c
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- Committer: Björn Påhlsson
- Date: 2010-09-07 20:22:16 UTC
- mto: (237.7.1 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@fukt.bsnet.se-20100907202216-vypcn3nsd02mqz4s
mandos-monitor: removed milisecondsseconds from countdown.
- files added:
- plugins.d/plymouth
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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 */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
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
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
87
96
88
#ifdef __linux__
97
89
#include <sys/klog.h> /* klogctl() */
115
107
init_gnutls_session(),
116
108
GNUTLS_* */
117
109
#include <gnutls/openpgp.h>
118
/* gnutls_certificate_set_openpgp_key_file(),
119
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
120
112
121
113
/* GPGME */
122
114
#include <gpgme.h> /* All GPGME types, constants and
130
122
#define PATHDIR "/conf/conf.d/mandos"
131
123
#define SECKEY "seckey.txt"
132
124
#define PUBKEY "pubkey.txt"
133
#define HOOKDIR "/lib/mandos/network-hooks.d"
134
125
135
126
bool debug = false;
136
127
static const char mandos_protocol_version[] = "1";
137
128
const char *argp_program_version = "mandos-client " VERSION;
138
const char *argp_program_bug_address = "<mandos@recompile.se>";
139
static const char sys_class_net[] = "/sys/class/net";
140
char *connect_to = NULL;
141
const char *hookdir = HOOKDIR;
142
uid_t uid = 65534;
143
gid_t gid = 65534;
144
145
/* Doubly linked list that need to be circularly linked when used */
146
typedef struct server{
147
const char *ip;
148
uint16_t port;
149
AvahiIfIndex if_index;
150
int af;
151
struct timespec last_seen;
152
struct server *next;
153
struct server *prev;
154
} server;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
155
130
156
131
/* Used for passing in values through the Avahi callback functions */
157
132
typedef struct {
162
137
gnutls_dh_params_t dh_params;
163
138
const char *priority;
164
139
gpgme_ctx_t ctx;
165
server *current_server;
166
140
} mandos_context;
167
141
168
142
/* global context so signal handler can reach it*/
169
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
144
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
146
174
147
sig_atomic_t quit_now = 0;
175
148
int signal_received = 0;
176
149
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
150
/*
197
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
152
* bytes. "buffer_capacity" is how much is currently allocated,
199
153
* "buffer_length" is how much is already used.
200
154
*/
201
155
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
156
size_t buffer_capacity){
203
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
159
if(buffer == NULL){
210
164
return buffer_capacity;
211
165
}
212
166
213
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
int af){
216
int ret;
217
server *new_server = malloc(sizeof(server));
218
if(new_server == NULL){
219
perror_plus("malloc");
220
return false;
221
}
222
*new_server = (server){ .ip = strdup(ip),
223
.port = port,
224
.if_index = if_index,
225
.af = af };
226
if(new_server->ip == NULL){
227
perror_plus("strdup");
228
return false;
229
}
230
/* Special case of first server */
231
if (mc.current_server == NULL){
232
new_server->next = new_server;
233
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
236
} else {
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
239
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
246
}
247
return true;
248
}
249
250
167
/*
251
168
* Initialize GPGME.
252
169
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
const char *tempdir){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
255
172
gpgme_error_t rc;
256
173
gpgme_engine_info_t engine_info;
257
174
266
183
267
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
268
185
if(fd == -1){
269
perror_plus("open");
186
perror("open");
270
187
return false;
271
188
}
272
189
273
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
274
191
if(rc != GPG_ERR_NO_ERROR){
275
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
277
194
return false;
278
195
}
279
196
280
197
rc = gpgme_op_import(mc.ctx, pgp_data);
281
198
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
284
201
return false;
285
202
}
286
203
287
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
288
205
if(ret == -1){
289
perror_plus("close");
206
perror("close");
290
207
}
291
208
gpgme_data_release(pgp_data);
292
209
return true;
293
210
}
294
211
295
212
if(debug){
296
fprintf_plus(stderr, "Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
297
214
}
298
215
299
216
/* Init GPGME */
300
217
gpgme_check_version(NULL);
301
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
302
219
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
305
222
return false;
306
223
}
307
224
308
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
309
226
rc = gpgme_get_engine_info(&engine_info);
310
227
if(rc != GPG_ERR_NO_ERROR){
311
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
312
gpgme_strsource(rc), gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
313
230
return false;
314
231
}
315
232
while(engine_info != NULL){
321
238
engine_info = engine_info->next;
322
239
}
323
240
if(engine_info == NULL){
324
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
325
tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
326
242
return false;
327
243
}
328
244
329
245
/* Create new GPGME "context" */
330
246
rc = gpgme_new(&(mc.ctx));
331
247
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
334
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
335
250
return false;
336
251
}
337
252
356
271
ssize_t plaintext_length = 0;
357
272
358
273
if(debug){
359
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
360
275
}
361
276
362
277
/* Create new GPGME data buffer from memory cryptotext */
363
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
364
279
0);
365
280
if(rc != GPG_ERR_NO_ERROR){
366
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
368
283
return -1;
369
284
}
370
285
371
286
/* Create new empty GPGME data buffer for the plaintext */
372
287
rc = gpgme_data_new(&dh_plain);
373
288
if(rc != GPG_ERR_NO_ERROR){
374
fprintf_plus(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_data_new: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
377
291
gpgme_data_release(dh_crypto);
378
292
return -1;
379
293
}
382
296
data buffer */
383
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
384
298
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
387
301
plaintext_length = -1;
388
302
if(debug){
389
303
gpgme_decrypt_result_t result;
390
304
result = gpgme_op_decrypt_result(mc.ctx);
391
305
if(result == NULL){
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
393
307
} else {
394
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
395
result->unsupported_algorithm);
396
fprintf_plus(stderr, "Wrong key usage: %u\n",
397
result->wrong_key_usage);
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
398
312
if(result->file_name != NULL){
399
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
400
314
}
401
315
gpgme_recipient_t recipient;
402
316
recipient = result->recipients;
403
317
while(recipient != NULL){
404
fprintf_plus(stderr, "Public key algorithm: %s\n",
405
gpgme_pubkey_algo_name
406
(recipient->pubkey_algo));
407
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
408
fprintf_plus(stderr, "Secret key available: %s\n",
409
recipient->status == GPG_ERR_NO_SECKEY
410
? "No" : "Yes");
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
411
324
recipient = recipient->next;
412
325
}
413
326
}
416
329
}
417
330
418
331
if(debug){
419
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
420
333
}
421
334
422
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
423
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
424
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
425
338
plaintext_length = -1;
426
339
goto decrypt_end;
427
340
}
429
342
*plaintext = NULL;
430
343
while(true){
431
344
plaintext_capacity = incbuffer(plaintext,
432
(size_t)plaintext_length,
433
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
434
347
if(plaintext_capacity == 0){
435
perror_plus("incbuffer");
436
plaintext_length = -1;
437
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
438
351
}
439
352
440
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
445
358
break;
446
359
}
447
360
if(ret < 0){
448
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
449
362
plaintext_length = -1;
450
363
goto decrypt_end;
451
364
}
453
366
}
454
367
455
368
if(debug){
456
fprintf_plus(stderr, "Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
457
370
for(ssize_t i = 0; i < plaintext_length; i++){
458
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
459
372
}
481
394
/* GnuTLS log function callback */
482
395
static void debuggnutls(__attribute__((unused)) int level,
483
396
const char* string){
484
fprintf_plus(stderr, "GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
485
398
}
486
399
487
400
static int init_gnutls_global(const char *pubkeyfilename,
489
402
int ret;
490
403
491
404
if(debug){
492
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
493
406
}
494
407
495
408
ret = gnutls_global_init();
496
409
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
499
412
return -1;
500
413
}
501
414
508
421
}
509
422
510
423
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
512
425
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
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));
515
431
gnutls_global_deinit();
516
432
return -1;
517
433
}
518
434
519
435
if(debug){
520
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n",
522
pubkeyfilename,
523
seckeyfilename);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
524
439
}
525
440
526
441
ret = gnutls_certificate_set_openpgp_key_file
527
442
(mc.cred, pubkeyfilename, seckeyfilename,
528
443
GNUTLS_OPENPGP_FMT_BASE64);
529
444
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr,
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
534
safer_gnutls_strerror(ret));
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));
535
450
goto globalfail;
536
451
}
537
452
538
453
/* GnuTLS server initialization */
539
454
ret = gnutls_dh_params_init(&mc.dh_params);
540
455
if(ret != GNUTLS_E_SUCCESS){
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
" initialization: %s\n",
543
safer_gnutls_strerror(ret));
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
544
458
goto globalfail;
545
459
}
546
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
461
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
550
464
goto globalfail;
551
465
}
552
466
572
486
}
573
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
488
if(ret != GNUTLS_E_SUCCESS){
575
fprintf_plus(stderr,
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
578
491
}
579
492
580
493
{
587
500
}
588
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
502
if(ret != GNUTLS_E_SUCCESS){
590
fprintf_plus(stderr, "Syntax error at: %s\n", err);
591
fprintf_plus(stderr, "GnuTLS error: %s\n",
592
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));
593
506
gnutls_deinit(*session);
594
507
return -1;
595
508
}
604
517
}
605
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
519
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
608
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
609
522
gnutls_deinit(*session);
610
523
return -1;
611
524
}
656
569
pf = PF_INET;
657
570
break;
658
571
default:
659
fprintf_plus(stderr, "Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
660
573
errno = EINVAL;
661
574
return -1;
662
575
}
667
580
}
668
581
669
582
if(debug){
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
672
585
}
673
586
674
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
675
588
if(tcp_sd < 0){
676
589
int e = errno;
677
perror_plus("socket");
590
perror("socket");
678
591
errno = e;
679
592
goto mandos_end;
680
593
}
694
607
}
695
608
if(ret < 0 ){
696
609
int e = errno;
697
perror_plus("inet_pton");
610
perror("inet_pton");
698
611
errno = e;
699
612
goto mandos_end;
700
613
}
701
614
if(ret == 0){
702
615
int e = errno;
703
fprintf_plus(stderr, "Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
704
617
errno = e;
705
618
goto mandos_end;
706
619
}
711
624
712
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
627
-Wunreachable-code*/
715
628
if(if_index == AVAHI_IF_UNSPEC){
716
fprintf_plus(stderr, "An IPv6 link-local address is"
717
" incomplete without a network interface\n");
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
718
631
errno = EINVAL;
719
632
goto mandos_end;
720
633
}
736
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
737
650
char interface[IF_NAMESIZE];
738
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
perror_plus("if_indextoname");
652
perror("if_indextoname");
740
653
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
743
656
}
744
657
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
747
660
}
748
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
756
669
sizeof(addrstr));
757
670
}
758
671
if(pcret == NULL){
759
perror_plus("inet_ntop");
672
perror("inet_ntop");
760
673
} else {
761
674
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
763
676
}
764
677
}
765
678
}
775
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
689
}
777
690
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
691
int e = errno;
692
perror("connect");
693
errno = e;
783
694
goto mandos_end;
784
695
}
785
696
793
704
while(true){
794
705
size_t out_size = strlen(out);
795
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
796
out_size - written));
707
out_size - written));
797
708
if(ret == -1){
798
709
int e = errno;
799
perror_plus("write");
710
perror("write");
800
711
errno = e;
801
712
goto mandos_end;
802
713
}
819
730
}
820
731
821
732
if(debug){
822
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
823
734
}
824
735
825
736
if(quit_now){
827
738
goto mandos_end;
828
739
}
829
740
830
/* This casting via intptr_t is to eliminate warning about casting
831
an int to a pointer type. This is exactly how the GnuTLS Guile
832
function "set-session-transport-fd!" does it. */
833
gnutls_transport_set_ptr(session,
834
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
835
742
836
743
if(quit_now){
837
744
errno = EINTR;
848
755
849
756
if(ret != GNUTLS_E_SUCCESS){
850
757
if(debug){
851
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
852
759
gnutls_perror(ret);
853
760
}
854
761
errno = EPROTO;
858
765
/* Read OpenPGP packet that contains the wanted password */
859
766
860
767
if(debug){
861
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
862
" %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
863
770
}
864
771
865
772
while(true){
870
777
}
871
778
872
779
buffer_capacity = incbuffer(&buffer, buffer_length,
873
buffer_capacity);
780
buffer_capacity);
874
781
if(buffer_capacity == 0){
875
782
int e = errno;
876
perror_plus("incbuffer");
783
perror("incbuffer");
877
784
errno = e;
878
785
goto mandos_end;
879
786
}
903
810
}
904
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
905
812
if(ret < 0){
906
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
907
"***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
908
814
gnutls_perror(ret);
909
815
errno = EPROTO;
910
816
goto mandos_end;
911
817
}
912
818
break;
913
819
default:
914
fprintf_plus(stderr, "Unknown error while reading data from"
915
" encrypted session with Mandos server\n");
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
916
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
917
823
errno = EIO;
918
824
goto mandos_end;
923
829
}
924
830
925
831
if(debug){
926
fprintf_plus(stderr, "Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
927
833
}
928
834
929
835
if(quit_now){
941
847
942
848
if(buffer_length > 0){
943
849
ssize_t decrypted_buffer_size;
944
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
945
852
&decrypted_buffer);
946
853
if(decrypted_buffer_size >= 0){
947
854
958
865
if(ret == 0 and ferror(stdout)){
959
866
int e = errno;
960
867
if(debug){
961
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
962
strerror(errno));
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
963
870
}
964
871
errno = e;
965
872
goto mandos_end;
984
891
if(e == 0){
985
892
e = errno;
986
893
}
987
perror_plus("close");
894
perror("close");
988
895
}
989
896
gnutls_deinit(session);
990
errno = e;
991
897
if(quit_now){
992
errno = EINTR;
898
e = EINTR;
993
899
retval = -1;
994
900
}
901
errno = e;
995
902
}
996
903
return retval;
997
904
}
1022
929
switch(event){
1023
930
default:
1024
931
case AVAHI_RESOLVER_FAILURE:
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1029
935
break;
1030
936
1031
937
case AVAHI_RESOLVER_FOUND:
1033
939
char ip[AVAHI_ADDRESS_STR_MAX];
1034
940
avahi_address_snprint(ip, sizeof(ip), address);
1035
941
if(debug){
1036
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
host_name, ip, (intmax_t)interface, port);
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1039
945
}
1040
946
int ret = start_mandos_communication(ip, port, interface,
1041
947
avahi_proto_to_af(proto));
1042
948
if(ret == 0){
1043
949
avahi_simple_poll_quit(mc.simple_poll);
1044
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
" list\n", name);
1049
}
1050
950
}
1051
951
}
1052
952
}
1076
976
default:
1077
977
case AVAHI_BROWSER_FAILURE:
1078
978
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
1081
981
avahi_simple_poll_quit(mc.simple_poll);
1082
982
return;
1083
983
1090
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
991
name, type, domain, protocol, 0,
1092
992
resolve_callback, NULL) == NULL)
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1096
995
break;
1097
996
1098
997
case AVAHI_BROWSER_REMOVE:
1101
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1102
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1103
1002
if(debug){
1104
fprintf_plus(stderr, "No Mandos server found, still"
1105
" searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1106
1004
}
1107
1005
break;
1108
1006
}
1109
1007
}
1110
1008
1111
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1112
1010
static void handle_sigterm(int sig){
1113
1011
if(quit_now){
1114
1012
return;
1116
1014
quit_now = 1;
1117
1015
signal_received = sig;
1118
1016
int old_errno = errno;
1119
/* set main loop to exit */
1120
1017
if(mc.simple_poll != NULL){
1121
1018
avahi_simple_poll_quit(mc.simple_poll);
1122
1019
}
1123
1020
errno = old_errno;
1124
1021
}
1125
1022
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
int ret;
1128
error_t ret_errno;
1129
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1131
if(s < 0){
1132
ret_errno = errno;
1133
perror_plus("socket");
1134
errno = ret_errno;
1135
return false;
1136
}
1137
strcpy(ifr->ifr_name, ifname);
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
if(ret == -1){
1140
if(debug){
1141
ret_errno = errno;
1142
perror_plus("ioctl SIOCGIFFLAGS");
1143
errno = ret_errno;
1144
}
1145
return false;
1146
}
1147
return true;
1148
}
1149
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1152
/* Reject the loopback device */
1153
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1156
ifname);
1157
}
1158
return false;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf_plus(stderr, "Accepting point-to-point interface"
1164
" \"%s\"\n", ifname);
1165
}
1166
return true;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1172
" \"%s\"\n", ifname);
1173
}
1174
return false;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(ifr->ifr_flags & IFF_NOARP){
1178
if(debug){
1179
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
ifname);
1181
}
1182
return false;
1183
}
1184
1185
/* Accept this device */
1186
if(debug){
1187
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1188
}
1189
return true;
1190
}
1191
1192
/*
1193
* This function determines if a directory entry in /sys/class/net
1194
* corresponds to an acceptable network device.
1195
* (This function is passed to scandir(3) as a filter function.)
1196
*/
1197
int good_interface(const struct dirent *if_entry){
1198
if(if_entry->d_name[0] == '.'){
1199
return 0;
1200
}
1201
1202
struct ifreq ifr;
1203
if(not get_flags(if_entry->d_name, &ifr)){
1204
if(debug){
1205
fprintf_plus(stderr, "Failed to get flags for interface "
1206
"\"%s\"\n", if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
/*
1218
* This function determines if a network interface is up.
1219
*/
1220
bool interface_is_up(const char *interface){
1221
struct ifreq ifr;
1222
if(not get_flags(interface, &ifr)){
1223
if(debug){
1224
fprintf_plus(stderr, "Failed to get flags for interface "
1225
"\"%s\"\n", interface);
1226
}
1227
return false;
1228
}
1229
1230
return (bool)(ifr.ifr_flags & IFF_UP);
1231
}
1232
1233
/*
1234
* This function determines if a network interface is running
1235
*/
1236
bool interface_is_running(const char *interface){
1237
struct ifreq ifr;
1238
if(not get_flags(interface, &ifr)){
1239
if(debug){
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", interface);
1242
}
1243
return false;
1244
}
1245
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1446
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1452
if(numhooks == -1){
1453
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1461
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1532
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
1569
}
1570
1571
error_t bring_up_interface(const char *const interface,
1572
const float delay){
1573
int sd = -1;
1574
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
1577
struct ifreq network;
1578
unsigned int if_index = if_nametoindex(interface);
1579
if(if_index == 0){
1580
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1581
errno = old_errno;
1582
return ENXIO;
1583
}
1584
1585
if(quit_now){
1586
errno = old_errno;
1587
return EINTR;
1588
}
1589
1590
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
1592
ret_errno = errno;
1593
fprintf_plus(stderr, "Failed to get flags for interface "
1594
"\"%s\"\n", interface);
1595
return ret_errno;
1596
}
1597
network.ifr_flags |= IFF_UP;
1598
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
1601
ret_errno = errno;
1602
perror_plus("socket");
1603
errno = old_errno;
1604
return ret_errno;
1605
}
1606
1607
if(quit_now){
1608
close(sd);
1609
errno = old_errno;
1610
return EINTR;
1611
}
1612
1613
if(debug){
1614
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1615
interface);
1616
}
1617
1618
/* Raise priviliges */
1619
raise_privileges();
1620
1621
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
1629
}
1630
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
1633
#ifdef __linux__
1634
if(restore_loglevel){
1635
ret_linux = klogctl(7, NULL, 0);
1636
if(ret_linux == -1){
1637
perror_plus("klogctl");
1638
}
1639
}
1640
#endif /* __linux__ */
1641
1642
/* Lower privileges */
1643
lower_privileges();
1644
1645
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1647
if(ret == -1){
1648
perror_plus("close");
1649
}
1650
1651
if(ret_setflags == -1){
1652
errno = ret_errno;
1653
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
errno = old_errno;
1655
return ret_errno;
1656
}
1657
} else if(debug){
1658
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1659
interface);
1660
}
1661
1662
/* Sleep checking until interface is running.
1663
Check every 0.25s, up to total time of delay */
1664
for(int i=0; i < delay * 4; i++){
1665
if(interface_is_running(interface)){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
1675
errno = old_errno;
1676
return 0;
1677
}
1678
1679
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
if(interface_is_up(interface)){
1692
if(not get_flags(interface, &network) and debug){
1693
ret_errno = errno;
1694
fprintf_plus(stderr, "Failed to get flags for interface "
1695
"\"%s\"\n", interface);
1696
return ret_errno;
1697
}
1698
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
1702
ret_errno = errno;
1703
perror_plus("socket");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
1708
if(debug){
1709
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1710
interface);
1711
}
1712
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
1721
1722
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1724
if(ret == -1){
1725
perror_plus("close");
1726
}
1727
1728
if(ret_setflags == -1){
1729
errno = ret_errno;
1730
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
} else if(debug){
1735
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1736
interface);
1737
}
1738
1739
errno = old_errno;
1740
return 0;
1741
}
1742
1743
1023
int main(int argc, char *argv[]){
1744
1024
AvahiSServiceBrowser *sb = NULL;
1745
error_t ret_errno;
1025
int error;
1746
1026
int ret;
1747
1027
intmax_t tmpmax;
1748
1028
char *tmp;
1749
1029
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
char *interfaces_to_take_down = NULL;
1753
size_t interfaces_to_take_down_size = 0;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1754
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1755
1038
bool tempdir_created = false;
1756
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
1040
const char *seckey = PATHDIR "/" SECKEY;
1758
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1759
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
1042
1762
1043
bool gnutls_initialized = false;
1763
1044
bool gpgme_initialized = false;
1764
1045
float delay = 2.5f;
1765
double retry_interval = 10; /* 10s between trying a server and
1766
retrying the same server again */
1767
1046
1768
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1769
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1775
1054
errno = 0;
1776
1055
ret = setgid(gid);
1777
1056
if(ret == -1){
1778
perror_plus("setgid");
1057
perror("setgid");
1779
1058
}
1780
1059
1781
1060
/* Lower user privileges (temporarily) */
1782
1061
errno = 0;
1783
1062
ret = seteuid(uid);
1784
1063
if(ret == -1){
1785
perror_plus("seteuid");
1064
perror("seteuid");
1786
1065
}
1787
1066
1788
1067
if(quit_now){
1823
1102
.arg = "SECONDS",
1824
1103
.doc = "Maximum delay to wait for interface startup",
1825
1104
.group = 2 },
1826
{ .name = "retry", .key = 132,
1827
.arg = "SECONDS",
1828
.doc = "Retry interval used when denied by the Mandos server",
1829
.group = 2 },
1830
{ .name = "network-hook-dir", .key = 133,
1831
.arg = "DIR",
1832
.doc = "Directory where network hooks are located",
1833
.group = 2 },
1834
1105
/*
1835
1106
* These reproduce what we would get without ARGP_NO_HELP
1836
1107
*/
1854
1125
connect_to = arg;
1855
1126
break;
1856
1127
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
1859
if(ret_errno != 0){
1860
argp_error(state, "%s", strerror(ret_errno));
1861
}
1128
interface = arg;
1862
1129
break;
1863
1130
case 's': /* --seckey */
1864
1131
seckey = arg;
1884
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1885
1152
argp_error(state, "Bad delay");
1886
1153
}
1887
case 132: /* --retry */
1888
errno = 0;
1889
retry_interval = strtod(arg, &tmp);
1890
if(errno != 0 or tmp == arg or *tmp != '\0'
1891
or (retry_interval * 1000) > INT_MAX
1892
or retry_interval < 0){
1893
argp_error(state, "Bad retry interval");
1894
}
1895
break;
1896
case 133: /* --network-hook-dir */
1897
hookdir = arg;
1898
1154
break;
1899
1155
/*
1900
1156
* These reproduce what we would get without ARGP_NO_HELP
1907
1163
argp_state_help(state, state->out_stream,
1908
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1909
1165
case 'V': /* --version */
1910
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1911
1167
exit(argp_err_exit_status);
1912
1168
break;
1913
1169
default:
1928
1184
case ENOMEM:
1929
1185
default:
1930
1186
errno = ret;
1931
perror_plus("argp_parse");
1187
perror("argp_parse");
1932
1188
exitcode = EX_OSERR;
1933
1189
goto end;
1934
1190
case EINVAL:
1936
1192
goto end;
1937
1193
}
1938
1194
}
1939
1940
{
1941
/* Work around Debian bug #633582:
1942
<http://bugs.debian.org/633582> */
1943
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
1946
struct stat st;
1947
1948
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1949
int seckey_fd = open(seckey, O_RDONLY);
1950
if(seckey_fd == -1){
1951
perror_plus("open");
1952
} else {
1953
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1954
if(ret == -1){
1955
perror_plus("fstat");
1956
} else {
1957
if(S_ISREG(st.st_mode)
1958
and st.st_uid == 0 and st.st_gid == 0){
1959
ret = fchown(seckey_fd, uid, gid);
1960
if(ret == -1){
1961
perror_plus("fchown");
1962
}
1963
}
1964
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
1966
}
1967
}
1968
1969
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
int pubkey_fd = open(pubkey, O_RDONLY);
1971
if(pubkey_fd == -1){
1972
perror_plus("open");
1973
} else {
1974
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1975
if(ret == -1){
1976
perror_plus("fstat");
1977
} else {
1978
if(S_ISREG(st.st_mode)
1979
and st.st_uid == 0 and st.st_gid == 0){
1980
ret = fchown(pubkey_fd, uid, gid);
1981
if(ret == -1){
1982
perror_plus("fchown");
1983
}
1984
}
1985
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
1990
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
1995
}
1996
}
1997
}
1998
1999
/* Remove empty interface names */
2000
{
2001
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2003
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2007
" \"%s\"\n", interface);
2008
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2010
interface = NULL;
2011
}
2012
}
2013
}
2014
2015
/* Run network hooks */
2016
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2028
}
2029
1195
2030
1196
if(not debug){
2031
1197
avahi_set_log_function(empty_log);
2037
1203
srand((unsigned int) time(NULL));
2038
1204
mc.simple_poll = avahi_simple_poll_new();
2039
1205
if(mc.simple_poll == NULL){
2040
fprintf_plus(stderr,
2041
"Avahi: Failed to create simple poll object.\n");
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2042
1207
exitcode = EX_UNAVAILABLE;
2043
1208
goto end;
2044
1209
}
2046
1211
sigemptyset(&sigterm_action.sa_mask);
2047
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2048
1213
if(ret == -1){
2049
perror_plus("sigaddset");
1214
perror("sigaddset");
2050
1215
exitcode = EX_OSERR;
2051
1216
goto end;
2052
1217
}
2053
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2054
1219
if(ret == -1){
2055
perror_plus("sigaddset");
1220
perror("sigaddset");
2056
1221
exitcode = EX_OSERR;
2057
1222
goto end;
2058
1223
}
2059
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2060
1225
if(ret == -1){
2061
perror_plus("sigaddset");
1226
perror("sigaddset");
2062
1227
exitcode = EX_OSERR;
2063
1228
goto end;
2064
1229
}
2068
1233
*/
2069
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2070
1235
if(ret == -1){
2071
perror_plus("sigaction");
1236
perror("sigaction");
2072
1237
return EX_OSERR;
2073
1238
}
2074
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
2075
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
2076
1241
if(ret == -1){
2077
perror_plus("sigaction");
1242
perror("sigaction");
2078
1243
exitcode = EX_OSERR;
2079
1244
goto end;
2080
1245
}
2081
1246
}
2082
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2083
1248
if(ret == -1){
2084
perror_plus("sigaction");
1249
perror("sigaction");
2085
1250
return EX_OSERR;
2086
1251
}
2087
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
2088
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2089
1254
if(ret == -1){
2090
perror_plus("sigaction");
1255
perror("sigaction");
2091
1256
exitcode = EX_OSERR;
2092
1257
goto end;
2093
1258
}
2094
1259
}
2095
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2096
1261
if(ret == -1){
2097
perror_plus("sigaction");
1262
perror("sigaction");
2098
1263
return EX_OSERR;
2099
1264
}
2100
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
2101
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2102
1267
if(ret == -1){
2103
perror_plus("sigaction");
1268
perror("sigaction");
2104
1269
exitcode = EX_OSERR;
2105
1270
goto end;
2106
1271
}
2107
1272
}
2108
1273
2109
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2112
/* Look for any good interfaces */
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2114
alphasort);
2115
if(ret >= 1){
2116
/* Add all found interfaces to interfaces list */
2117
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2119
direntries[i]->d_name);
2120
if(ret_errno != 0){
2121
perror_plus("argz_add");
2122
continue;
2123
}
2124
if(debug){
2125
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
direntries[i]->d_name);
2127
}
2128
}
2129
free(direntries);
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
2130
1409
} else {
2131
free(direntries);
2132
fprintf_plus(stderr, "Could not find a network interface\n");
2133
exitcode = EXIT_FAILURE;
2134
goto end;
2135
}
2136
}
2137
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2150
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2152
interface))){
2153
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2155
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2159
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2163
}
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
2164
1414
}
2165
1415
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
if(debug and (interfaces_to_take_down == NULL)){
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
}
2172
1416
}
2173
1417
2174
1418
if(quit_now){
2177
1421
2178
1422
ret = init_gnutls_global(pubkey, seckey);
2179
1423
if(ret == -1){
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2181
1425
exitcode = EX_UNAVAILABLE;
2182
1426
goto end;
2183
1427
} else {
2188
1432
goto end;
2189
1433
}
2190
1434
1435
tempdir_created = true;
2191
1436
if(mkdtemp(tempdir) == NULL){
2192
perror_plus("mkdtemp");
1437
tempdir_created = false;
1438
perror("mkdtemp");
2193
1439
goto end;
2194
1440
}
2195
tempdir_created = true;
2196
1441
2197
1442
if(quit_now){
2198
1443
goto end;
2199
1444
}
2200
1445
2201
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
2202
fprintf_plus(stderr, "init_gpgme failed\n");
1447
fprintf(stderr, "init_gpgme failed\n");
2203
1448
exitcode = EX_UNAVAILABLE;
2204
1449
goto end;
2205
1450
} else {
2214
1459
/* Connect directly, do not use Zeroconf */
2215
1460
/* (Mainly meant for debugging) */
2216
1461
char *address = strrchr(connect_to, ':');
2217
2218
1462
if(address == NULL){
2219
fprintf_plus(stderr, "No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2220
1464
exitcode = EX_USAGE;
2221
1465
goto end;
2222
1466
}
2230
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2231
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
1476
or tmpmax != (uint16_t)tmpmax){
2233
fprintf_plus(stderr, "Bad port number\n");
1477
fprintf(stderr, "Bad port number\n");
2234
1478
exitcode = EX_USAGE;
2235
1479
goto end;
2236
1480
}
2241
1485
2242
1486
port = (uint16_t)tmpmax;
2243
1487
*address = '\0';
1488
address = connect_to;
2244
1489
/* Colon in address indicates IPv6 */
2245
1490
int af;
2246
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2247
1492
af = AF_INET6;
2248
/* Accept [] around IPv6 address - see RFC 5952 */
2249
if(connect_to[0] == '[' and address[-1] == ']')
2250
{
2251
connect_to++;
2252
address[-1] = '\0';
2253
}
2254
1493
} else {
2255
1494
af = AF_INET;
2256
1495
}
2257
address = connect_to;
2258
1496
2259
1497
if(quit_now){
2260
1498
goto end;
2261
1499
}
2262
1500
2263
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2265
if(quit_now or ret == 0){
2266
break;
2267
}
2268
if(debug){
2269
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
(int)retry_interval);
2271
}
2272
sleep((int)retry_interval);
2273
}
2274
2275
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 {
2276
1523
exitcode = EXIT_SUCCESS;
2277
1524
}
2278
2279
1525
goto end;
2280
1526
}
2281
1527
2295
1541
/* Allocate a new server */
2296
1542
mc.server = avahi_server_new(avahi_simple_poll_get
2297
1543
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
1544
NULL, &error);
2299
1545
2300
1546
/* Free the Avahi configuration data */
2301
1547
avahi_server_config_free(&config);
2303
1549
2304
1550
/* Check if creating the Avahi server object succeeded */
2305
1551
if(mc.server == NULL){
2306
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2307
avahi_strerror(ret_errno));
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2308
1554
exitcode = EX_UNAVAILABLE;
2309
1555
goto end;
2310
1556
}
2318
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
1565
NULL, 0, browse_callback, NULL);
2320
1566
if(sb == NULL){
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
avahi_strerror(avahi_server_errno(mc.server)));
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2323
1569
exitcode = EX_UNAVAILABLE;
2324
1570
goto end;
2325
1571
}
2331
1577
/* Run the main loop */
2332
1578
2333
1579
if(debug){
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2339
if(debug){
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
(ret == 0) ? "successfully" : "with error");
2342
}
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2343
1584
2344
1585
end:
2345
1586
2346
1587
if(debug){
2347
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2348
1589
}
2349
1590
2350
1591
/* Cleanup things */
2367
1608
gpgme_release(mc.ctx);
2368
1609
}
2369
1610
2370
/* Cleans up the circular linked list of Mandos servers the client
2371
has seen */
2372
if(mc.current_server != NULL){
2373
mc.current_server->prev->next = NULL;
2374
while(mc.current_server != NULL){
2375
server *next = mc.current_server->next;
2376
free(mc.current_server);
2377
mc.current_server = next;
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
2378
1618
}
2379
}
2380
2381
/* Re-raise priviliges */
2382
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2398
1628
}
2399
1629
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2403
1639
}
2404
1640
}
2405
2406
lower_privileges_permanently();
2407
1641
}
2408
1642
2409
free(interfaces_to_take_down);
2410
free(interfaces_hooks);
2411
2412
/* Removes the GPGME temp directory and all files inside */
1643
/* Removes the temp directory used by GPGME */
2413
1644
if(tempdir_created){
2414
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
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
}
2421
1665
char *fullname = NULL;
2422
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
1667
direntry->d_name);
2424
1668
if(ret < 0){
2425
perror_plus("asprintf");
1669
perror("asprintf");
2426
1670
continue;
2427
1671
}
2428
1672
ret = remove(fullname);
2429
1673
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2432
1676
}
2433
1677
free(fullname);
2434
1678
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
1679
closedir(d);
2441
1680
}
2442
1681
ret = rmdir(tempdir);
2443
1682
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
1683
perror("rmdir");
2445
1684
}
2446
1685
}
2447
1686
2452
1691
&old_sigterm_action,
2453
1692
NULL));
2454
1693
if(ret == -1){
2455
perror_plus("sigaction");
1694
perror("sigaction");
2456
1695
}
2457
1696
do {
2458
1697
ret = raise(signal_received);
2459
1698
} while(ret != 0 and errno == EINTR);
2460
1699
if(ret != 0){
2461
perror_plus("raise");
1700
perror("raise");
2462
1701
abort();
2463
1702
}
2464
1703
TEMP_FAILURE_RETRY(pause());
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Version: 2.0.2.dev0