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237.2.216
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2010-10-02 17:41:05 UTC
- mto: (24.1.169 mandos)
- mto: This revision was merged to the branch mainline in revision 274.
- Revision ID: teddy@fukt.bsnet.se-20101002174105-xfqa0j8y1puvedo3
* debian/source/format: New; contains "3.0 (quilt)".
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
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() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
87
95
88
#ifdef __linux__
96
89
#include <sys/klog.h> /* klogctl() */
114
107
init_gnutls_session(),
115
108
GNUTLS_* */
116
109
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
119
112
120
113
/* GPGME */
121
114
#include <gpgme.h> /* All GPGME types, constants and
129
122
#define PATHDIR "/conf/conf.d/mandos"
130
123
#define SECKEY "seckey.txt"
131
124
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
125
134
126
bool debug = false;
135
127
static const char mandos_protocol_version[] = "1";
136
128
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
130
static const char sys_class_net[] = "/sys/class/net";
139
131
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
154
132
155
133
/* Used for passing in values through the Avahi callback functions */
156
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
157
136
AvahiServer *server;
158
137
gnutls_certificate_credentials_t cred;
159
138
unsigned int dh_bits;
160
139
gnutls_dh_params_t dh_params;
161
140
const char *priority;
162
141
gpgme_ctx_t ctx;
163
server *current_server;
164
142
} mandos_context;
165
143
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
171
148
172
149
sig_atomic_t quit_now = 0;
173
150
int signal_received = 0;
174
151
175
/* Function to use when printing errors */
176
void perror_plus(const char *print_text){
177
int e = errno;
178
fprintf(stderr, "Mandos plugin %s: ",
179
program_invocation_short_name);
180
errno = e;
181
perror(print_text);
182
}
183
184
__attribute__((format (gnu_printf, 2, 3)))
185
int fprintf_plus(FILE *stream, const char *format, ...){
186
va_list ap;
187
va_start (ap, format);
188
189
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
190
program_invocation_short_name));
191
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
}
193
194
152
/*
195
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
196
154
* bytes. "buffer_capacity" is how much is currently allocated,
197
155
* "buffer_length" is how much is already used.
198
156
*/
199
157
size_t incbuffer(char **buffer, size_t buffer_length,
200
size_t buffer_capacity){
158
size_t buffer_capacity){
201
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
202
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
203
161
if(buffer == NULL){
208
166
return buffer_capacity;
209
167
}
210
168
211
/* Add server to set of servers to retry periodically */
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
213
int af){
214
int ret;
215
server *new_server = malloc(sizeof(server));
216
if(new_server == NULL){
217
perror_plus("malloc");
218
return false;
219
}
220
*new_server = (server){ .ip = strdup(ip),
221
.port = port,
222
.if_index = if_index,
223
.af = af };
224
if(new_server->ip == NULL){
225
perror_plus("strdup");
226
return false;
227
}
228
/* Special case of first server */
229
if (mc.current_server == NULL){
230
new_server->next = new_server;
231
new_server->prev = new_server;
232
mc.current_server = new_server;
233
/* Place the new server last in the list */
234
} else {
235
new_server->next = mc.current_server;
236
new_server->prev = mc.current_server->prev;
237
new_server->prev->next = new_server;
238
mc.current_server->prev = new_server;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
return false;
244
}
245
return true;
246
}
247
248
169
/*
249
170
* Initialize GPGME.
250
171
*/
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
253
174
gpgme_error_t rc;
254
175
gpgme_engine_info_t engine_info;
255
176
177
256
178
/*
257
179
* Helper function to insert pub and seckey to the engine keyring.
258
180
*/
263
185
264
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
265
187
if(fd == -1){
266
perror_plus("open");
188
perror("open");
267
189
return false;
268
190
}
269
191
270
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
271
193
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
274
196
return false;
275
197
}
276
198
277
199
rc = gpgme_op_import(mc.ctx, pgp_data);
278
200
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
281
203
return false;
282
204
}
283
205
284
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
285
207
if(ret == -1){
286
perror_plus("close");
208
perror("close");
287
209
}
288
210
gpgme_data_release(pgp_data);
289
211
return true;
290
212
}
291
213
292
214
if(debug){
293
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
294
216
}
295
217
296
218
/* Init GPGME */
297
219
gpgme_check_version(NULL);
298
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
299
221
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
302
224
return false;
303
225
}
304
226
305
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
306
228
rc = gpgme_get_engine_info(&engine_info);
307
229
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
310
232
return false;
311
233
}
312
234
while(engine_info != NULL){
318
240
engine_info = engine_info->next;
319
241
}
320
242
if(engine_info == NULL){
321
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
322
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
323
244
return false;
324
245
}
325
246
326
247
/* Create new GPGME "context" */
327
248
rc = gpgme_new(&(mc.ctx));
328
249
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
331
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
332
252
return false;
333
253
}
334
254
353
273
ssize_t plaintext_length = 0;
354
274
355
275
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
277
}
358
278
359
279
/* Create new GPGME data buffer from memory cryptotext */
360
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
281
0);
362
282
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
365
285
return -1;
366
286
}
367
287
368
288
/* Create new empty GPGME data buffer for the plaintext */
369
289
rc = gpgme_data_new(&dh_plain);
370
290
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
374
293
gpgme_data_release(dh_crypto);
375
294
return -1;
376
295
}
379
298
data buffer */
380
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
300
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
384
303
plaintext_length = -1;
385
304
if(debug){
386
305
gpgme_decrypt_result_t result;
387
306
result = gpgme_op_decrypt_result(mc.ctx);
388
307
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
309
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
395
314
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
397
316
}
398
317
gpgme_recipient_t recipient;
399
318
recipient = result->recipients;
400
319
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
408
326
recipient = recipient->next;
409
327
}
410
328
}
413
331
}
414
332
415
333
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
335
}
418
336
419
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
420
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
421
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
422
340
plaintext_length = -1;
423
341
goto decrypt_end;
424
342
}
426
344
*plaintext = NULL;
427
345
while(true){
428
346
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
431
349
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
435
353
}
436
354
437
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
442
360
break;
443
361
}
444
362
if(ret < 0){
445
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
446
364
plaintext_length = -1;
447
365
goto decrypt_end;
448
366
}
450
368
}
451
369
452
370
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
454
372
for(ssize_t i = 0; i < plaintext_length; i++){
455
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
374
}
468
386
}
469
387
470
388
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
472
391
if(ret == NULL)
473
392
ret = "(unknown)";
474
393
return ret;
477
396
/* GnuTLS log function callback */
478
397
static void debuggnutls(__attribute__((unused)) int level,
479
398
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
481
400
}
482
401
483
402
static int init_gnutls_global(const char *pubkeyfilename,
485
404
int ret;
486
405
487
406
if(debug){
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
489
408
}
490
409
491
410
ret = gnutls_global_init();
492
411
if(ret != GNUTLS_E_SUCCESS){
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
495
414
return -1;
496
415
}
497
416
504
423
}
505
424
506
425
/* OpenPGP credentials */
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
508
427
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
511
433
gnutls_global_deinit();
512
434
return -1;
513
435
}
514
436
515
437
if(debug){
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
520
441
}
521
442
522
443
ret = gnutls_certificate_set_openpgp_key_file
523
444
(mc.cred, pubkeyfilename, seckeyfilename,
524
445
GNUTLS_OPENPGP_FMT_BASE64);
525
446
if(ret != GNUTLS_E_SUCCESS){
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
531
452
goto globalfail;
532
453
}
533
454
534
455
/* GnuTLS server initialization */
535
456
ret = gnutls_dh_params_init(&mc.dh_params);
536
457
if(ret != GNUTLS_E_SUCCESS){
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
540
460
goto globalfail;
541
461
}
542
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
463
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
546
466
goto globalfail;
547
467
}
548
468
568
488
}
569
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
490
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
574
493
}
575
494
576
495
{
583
502
}
584
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
504
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
589
508
gnutls_deinit(*session);
590
509
return -1;
591
510
}
600
519
}
601
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
521
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
605
524
gnutls_deinit(*session);
606
525
return -1;
607
526
}
619
538
__attribute__((unused)) const char *txt){}
620
539
621
540
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
623
542
AvahiIfIndex if_index,
624
543
int af){
625
544
int ret, tcp_sd = -1;
652
571
pf = PF_INET;
653
572
break;
654
573
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
656
575
errno = EINVAL;
657
576
return -1;
658
577
}
663
582
}
664
583
665
584
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
668
587
}
669
588
670
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
590
if(tcp_sd < 0){
672
591
int e = errno;
673
perror_plus("socket");
592
perror("socket");
674
593
errno = e;
675
594
goto mandos_end;
676
595
}
690
609
}
691
610
if(ret < 0 ){
692
611
int e = errno;
693
perror_plus("inet_pton");
612
perror("inet_pton");
694
613
errno = e;
695
614
goto mandos_end;
696
615
}
697
616
if(ret == 0){
698
617
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
700
619
errno = e;
701
620
goto mandos_end;
702
621
}
703
622
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
705
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
629
-Wunreachable-code*/
708
630
if(if_index == AVAHI_IF_UNSPEC){
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
711
633
errno = EINVAL;
712
634
goto mandos_end;
713
635
}
729
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
730
652
char interface[IF_NAMESIZE];
731
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
perror_plus("if_indextoname");
654
perror("if_indextoname");
733
655
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
736
658
}
737
659
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
740
662
}
741
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
749
671
sizeof(addrstr));
750
672
}
751
673
if(pcret == NULL){
752
perror_plus("inet_ntop");
674
perror("inet_ntop");
753
675
} else {
754
676
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
678
}
757
679
}
758
680
}
770
692
if(ret < 0){
771
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
694
int e = errno;
773
perror_plus("connect");
695
perror("connect");
774
696
errno = e;
775
697
}
776
698
goto mandos_end;
786
708
while(true){
787
709
size_t out_size = strlen(out);
788
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
789
out_size - written));
711
out_size - written));
790
712
if(ret == -1){
791
713
int e = errno;
792
perror_plus("write");
714
perror("write");
793
715
errno = e;
794
716
goto mandos_end;
795
717
}
812
734
}
813
735
814
736
if(debug){
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
738
}
817
739
818
740
if(quit_now){
820
742
goto mandos_end;
821
743
}
822
744
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
828
746
829
747
if(quit_now){
830
748
errno = EINTR;
841
759
842
760
if(ret != GNUTLS_E_SUCCESS){
843
761
if(debug){
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
763
gnutls_perror(ret);
846
764
}
847
765
errno = EPROTO;
851
769
/* Read OpenPGP packet that contains the wanted password */
852
770
853
771
if(debug){
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
856
774
}
857
775
858
776
while(true){
863
781
}
864
782
865
783
buffer_capacity = incbuffer(&buffer, buffer_length,
866
buffer_capacity);
784
buffer_capacity);
867
785
if(buffer_capacity == 0){
868
786
int e = errno;
869
perror_plus("incbuffer");
787
perror("incbuffer");
870
788
errno = e;
871
789
goto mandos_end;
872
790
}
896
814
}
897
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
898
816
if(ret < 0){
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
818
gnutls_perror(ret);
902
819
errno = EPROTO;
903
820
goto mandos_end;
904
821
}
905
822
break;
906
823
default:
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
909
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
827
errno = EIO;
911
828
goto mandos_end;
916
833
}
917
834
918
835
if(debug){
919
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
920
837
}
921
838
922
839
if(quit_now){
934
851
935
852
if(buffer_length > 0){
936
853
ssize_t decrypted_buffer_size;
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
938
856
&decrypted_buffer);
939
857
if(decrypted_buffer_size >= 0){
940
858
951
869
if(ret == 0 and ferror(stdout)){
952
870
int e = errno;
953
871
if(debug){
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
956
874
}
957
875
errno = e;
958
876
goto mandos_end;
977
895
if(e == 0){
978
896
e = errno;
979
897
}
980
perror_plus("close");
898
perror("close");
981
899
}
982
900
gnutls_deinit(session);
983
errno = e;
984
901
if(quit_now){
985
errno = EINTR;
902
e = EINTR;
986
903
retval = -1;
987
904
}
905
errno = e;
988
906
}
989
907
return retval;
990
908
}
1003
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
922
flags,
1005
923
AVAHI_GCC_UNUSED void* userdata){
1006
if(r == NULL){
1007
return;
1008
}
924
assert(r);
1009
925
1010
926
/* Called whenever a service has been resolved successfully or
1011
927
timed out */
1017
933
switch(event){
1018
934
default:
1019
935
case AVAHI_RESOLVER_FAILURE:
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno(mc.server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1024
939
break;
1025
940
1026
941
case AVAHI_RESOLVER_FOUND:
1028
943
char ip[AVAHI_ADDRESS_STR_MAX];
1029
944
avahi_address_snprint(ip, sizeof(ip), address);
1030
945
if(debug){
1031
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1032
PRIdMAX ") on port %" PRIu16 "\n", name,
1033
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1034
949
}
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
950
int ret = start_mandos_communication(ip, port, interface,
1037
951
avahi_proto_to_af(proto));
1038
952
if(ret == 0){
1039
avahi_simple_poll_quit(simple_poll);
1040
} else {
1041
if(not add_server(ip, (in_port_t)port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
953
avahi_simple_poll_quit(mc.simple_poll);
1046
954
}
1047
955
}
1048
956
}
1059
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1060
968
flags,
1061
969
AVAHI_GCC_UNUSED void* userdata){
1062
if(b == NULL){
1063
return;
1064
}
970
assert(b);
1065
971
1066
972
/* Called whenever a new services becomes available on the LAN or
1067
973
is removed from the LAN */
1074
980
default:
1075
981
case AVAHI_BROWSER_FAILURE:
1076
982
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1079
avahi_simple_poll_quit(simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1080
986
return;
1081
987
1082
988
case AVAHI_BROWSER_NEW:
1088
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1089
995
name, type, domain, protocol, 0,
1090
996
resolve_callback, NULL) == NULL)
1091
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1094
999
break;
1095
1000
1096
1001
case AVAHI_BROWSER_REMOVE:
1099
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1100
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1101
1006
if(debug){
1102
fprintf_plus(stderr, "No Mandos server found, still"
1103
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1104
1008
}
1105
1009
break;
1106
1010
}
1107
1011
}
1108
1012
1109
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1110
1014
static void handle_sigterm(int sig){
1111
1015
if(quit_now){
1112
1016
return;
1114
1018
quit_now = 1;
1115
1019
signal_received = sig;
1116
1020
int old_errno = errno;
1117
/* set main loop to exit */
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1120
1023
}
1121
1024
errno = old_errno;
1122
1025
}
1123
1026
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1125
int ret;
1126
error_t ret_errno;
1127
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1129
if(s < 0){
1130
ret_errno = errno;
1131
perror_plus("socket");
1132
errno = ret_errno;
1133
return false;
1134
}
1135
strcpy(ifr->ifr_name, ifname);
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1137
if(ret == -1){
1138
if(debug){
1139
ret_errno = errno;
1140
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1142
}
1143
return false;
1144
}
1145
return true;
1146
}
1147
1148
bool good_flags(const char *ifname, const struct ifreq *ifr){
1149
1150
/* Reject the loopback device */
1151
if(ifr->ifr_flags & IFF_LOOPBACK){
1152
if(debug){
1153
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1154
ifname);
1155
}
1156
return false;
1157
}
1158
/* Accept point-to-point devices only if connect_to is specified */
1159
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1160
if(debug){
1161
fprintf_plus(stderr, "Accepting point-to-point interface"
1162
" \"%s\"\n", ifname);
1163
}
1164
return true;
1165
}
1166
/* Otherwise, reject non-broadcast-capable devices */
1167
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1168
if(debug){
1169
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1170
" \"%s\"\n", ifname);
1171
}
1172
return false;
1173
}
1174
/* Reject non-ARP interfaces (including dummy interfaces) */
1175
if(ifr->ifr_flags & IFF_NOARP){
1176
if(debug){
1177
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1178
ifname);
1179
}
1180
return false;
1181
}
1182
1183
/* Accept this device */
1184
if(debug){
1185
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1186
}
1187
return true;
1188
}
1189
1190
1027
/*
1191
1028
* This function determines if a directory entry in /sys/class/net
1192
1029
* corresponds to an acceptable network device.
1193
1030
* (This function is passed to scandir(3) as a filter function.)
1194
1031
*/
1195
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1196
1041
if(if_entry->d_name[0] == '.'){
1197
1042
return 0;
1198
1043
}
1199
1200
struct ifreq ifr;
1201
if(not get_flags(if_entry->d_name, &ifr)){
1202
if(debug){
1203
fprintf_plus(stderr, "Failed to get flags for interface "
1204
"\"%s\"\n", if_entry->d_name);
1205
}
1206
return 0;
1207
}
1208
1209
if(not good_flags(if_entry->d_name, &ifr)){
1210
return 0;
1211
}
1212
return 1;
1213
}
1214
1215
/*
1216
* This function determines if a network interface is up.
1217
*/
1218
bool interface_is_up(const char *interface){
1219
struct ifreq ifr;
1220
if(not get_flags(interface, &ifr)){
1221
if(debug){
1222
fprintf_plus(stderr, "Failed to get flags for interface "
1223
"\"%s\"\n", interface);
1224
}
1225
return false;
1226
}
1227
1228
return (bool)(ifr.ifr_flags & IFF_UP);
1229
}
1230
1231
/*
1232
* This function determines if a network interface is running
1233
*/
1234
bool interface_is_running(const char *interface){
1235
struct ifreq ifr;
1236
if(not get_flags(interface, &ifr)){
1237
if(debug){
1238
fprintf_plus(stderr, "Failed to get flags for interface "
1239
"\"%s\"\n", interface);
1240
}
1241
return false;
1242
}
1243
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1245
}
1246
1247
int notdotentries(const struct dirent *direntry){
1248
/* Skip "." and ".." */
1249
if(direntry->d_name[0] == '.'
1250
and (direntry->d_name[1] == '\0'
1251
or (direntry->d_name[1] == '.'
1252
and direntry->d_name[2] == '\0'))){
1253
return 0;
1254
}
1255
return 1;
1256
}
1257
1258
/* Is this directory entry a runnable program? */
1259
int runnable_hook(const struct dirent *direntry){
1260
int ret;
1261
size_t sret;
1262
struct stat st;
1263
1264
if((direntry->d_name)[0] == '\0'){
1265
/* Empty name? */
1266
return 0;
1267
}
1268
1269
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1270
"abcdefghijklmnopqrstuvwxyz"
1271
"0123456789"
1272
"_-");
1273
if((direntry->d_name)[sret] != '\0'){
1274
/* Contains non-allowed characters */
1275
if(debug){
1276
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1277
direntry->d_name);
1278
}
1279
return 0;
1280
}
1281
1282
char *fullname = NULL;
1283
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1284
if(ret < 0){
1285
perror_plus("asprintf");
1286
return 0;
1287
}
1288
1289
ret = stat(fullname, &st);
1290
if(ret == -1){
1291
if(debug){
1292
perror_plus("Could not stat hook");
1293
}
1294
return 0;
1295
}
1296
if(not (S_ISREG(st.st_mode))){
1297
/* Not a regular file */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1305
/* Not executable */
1306
if(debug){
1307
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1308
direntry->d_name);
1309
}
1310
return 0;
1311
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1312
1115
if(debug){
1313
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1314
direntry->d_name);
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1315
1118
}
1316
1119
return 1;
1317
1120
}
1318
1121
1319
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1320
int ret;
1321
struct timespec now;
1322
struct timespec waited_time;
1323
intmax_t block_time;
1324
1325
while(true){
1326
if(mc.current_server == NULL){
1327
if (debug){
1328
fprintf_plus(stderr, "Wait until first server is found."
1329
" No timeout!\n");
1330
}
1331
ret = avahi_simple_poll_iterate(s, -1);
1332
} else {
1333
if (debug){
1334
fprintf_plus(stderr, "Check current_server if we should run"
1335
" it, or wait\n");
1336
}
1337
/* the current time */
1338
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1339
if(ret == -1){
1340
perror_plus("clock_gettime");
1341
return -1;
1342
}
1343
/* Calculating in ms how long time between now and server
1344
who we visted longest time ago. Now - last seen. */
1345
waited_time.tv_sec = (now.tv_sec
1346
- mc.current_server->last_seen.tv_sec);
1347
waited_time.tv_nsec = (now.tv_nsec
1348
- mc.current_server->last_seen.tv_nsec);
1349
/* total time is 10s/10,000ms.
1350
Converting to s from ms by dividing by 1,000,
1351
and ns to ms by dividing by 1,000,000. */
1352
block_time = ((retry_interval
1353
- ((intmax_t)waited_time.tv_sec * 1000))
1354
- ((intmax_t)waited_time.tv_nsec / 1000000));
1355
1356
if (debug){
1357
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1358
block_time);
1359
}
1360
1361
if(block_time <= 0){
1362
ret = start_mandos_communication(mc.current_server->ip,
1363
mc.current_server->port,
1364
mc.current_server->if_index,
1365
mc.current_server->af);
1366
if(ret == 0){
1367
avahi_simple_poll_quit(simple_poll);
1368
return 0;
1369
}
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1371
&mc.current_server->last_seen);
1372
if(ret == -1){
1373
perror_plus("clock_gettime");
1374
return -1;
1375
}
1376
mc.current_server = mc.current_server->next;
1377
block_time = 0; /* Call avahi to find new Mandos
1378
servers, but don't block */
1379
}
1380
1381
ret = avahi_simple_poll_iterate(s, (int)block_time);
1382
}
1383
if(ret != 0){
1384
if (ret > 0 or errno != EINTR){
1385
return (ret != 1) ? ret : 0;
1386
}
1387
}
1388
}
1389
}
1390
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1443
bool run_network_hooks(const char *mode, const char *interface,
1444
const float delay){
1445
struct dirent **direntries;
1446
struct dirent *direntry;
1447
int ret;
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1449
alphasort);
1450
if(numhooks == -1){
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1458
}
1459
} else {
1460
int devnull = open("/dev/null", O_RDONLY);
1461
for(int i = 0; i < numhooks; i++){
1462
direntry = direntries[i];
1463
char *fullname = NULL;
1464
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1465
if(ret < 0){
1466
perror_plus("asprintf");
1467
continue;
1468
}
1469
if(debug){
1470
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1471
direntry->d_name);
1472
}
1473
pid_t hook_pid = fork();
1474
if(hook_pid == 0){
1475
/* Child */
1476
/* Raise privileges */
1477
raise_privileges_permanently();
1478
/* Set group */
1479
errno = 0;
1480
ret = setgid(0);
1481
if(ret == -1){
1482
perror_plus("setgid");
1483
}
1484
/* Reset supplementary groups */
1485
errno = 0;
1486
ret = setgroups(0, NULL);
1487
if(ret == -1){
1488
perror_plus("setgroups");
1489
}
1490
dup2(devnull, STDIN_FILENO);
1491
close(devnull);
1492
dup2(STDERR_FILENO, STDOUT_FILENO);
1493
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("DEVICE", interface, 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
ret = setenv("MODE", mode, 1);
1509
if(ret == -1){
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
char *delaystring;
1514
ret = asprintf(&delaystring, "%f", delay);
1515
if(ret == -1){
1516
perror_plus("asprintf");
1517
_exit(EX_OSERR);
1518
}
1519
ret = setenv("DELAY", delaystring, 1);
1520
if(ret == -1){
1521
free(delaystring);
1522
perror_plus("setenv");
1523
_exit(EX_OSERR);
1524
}
1525
free(delaystring);
1526
if(connect_to != NULL){
1527
ret = setenv("CONNECT", connect_to, 1);
1528
if(ret == -1){
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
}
1533
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1534
perror_plus("execl");
1535
_exit(EXIT_FAILURE);
1536
}
1537
} else {
1538
int status;
1539
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1540
perror_plus("waitpid");
1541
free(fullname);
1542
continue;
1543
}
1544
if(WIFEXITED(status)){
1545
if(WEXITSTATUS(status) != 0){
1546
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1547
" with status %d\n", direntry->d_name,
1548
WEXITSTATUS(status));
1549
free(fullname);
1550
continue;
1551
}
1552
} else if(WIFSIGNALED(status)){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1554
" signal %d\n", direntry->d_name,
1555
WTERMSIG(status));
1556
free(fullname);
1557
continue;
1558
} else {
1559
fprintf_plus(stderr, "Warning: network hook \"%s\""
1560
" crashed\n", direntry->d_name);
1561
free(fullname);
1562
continue;
1563
}
1564
}
1565
free(fullname);
1566
if(debug){
1567
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1568
direntry->d_name);
1569
}
1570
}
1571
close(devnull);
1572
}
1573
return true;
1574
}
1575
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
1582
struct ifreq network;
1583
unsigned int if_index = if_nametoindex(interface);
1584
if(if_index == 0){
1585
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1586
errno = old_errno;
1587
return ENXIO;
1588
}
1589
1590
if(quit_now){
1591
errno = old_errno;
1592
return EINTR;
1593
}
1594
1595
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
1597
ret_errno = errno;
1598
fprintf_plus(stderr, "Failed to get flags for interface "
1599
"\"%s\"\n", interface);
1600
return ret_errno;
1601
}
1602
network.ifr_flags |= IFF_UP;
1603
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
1606
ret_errno = errno;
1607
perror_plus("socket");
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
if(quit_now){
1613
close(sd);
1614
errno = old_errno;
1615
return EINTR;
1616
}
1617
1618
if(debug){
1619
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1620
interface);
1621
}
1622
1623
/* Raise priviliges */
1624
raise_privileges();
1625
1626
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
1634
}
1635
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
1638
#ifdef __linux__
1639
if(restore_loglevel){
1640
ret_linux = klogctl(7, NULL, 0);
1641
if(ret_linux == -1){
1642
perror_plus("klogctl");
1643
}
1644
}
1645
#endif /* __linux__ */
1646
1647
/* Lower privileges */
1648
lower_privileges();
1649
1650
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1652
if(ret == -1){
1653
perror_plus("close");
1654
}
1655
1656
if(ret_setflags == -1){
1657
errno = ret_errno;
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
errno = old_errno;
1660
return ret_errno;
1661
}
1662
} else if(debug){
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1664
interface);
1665
}
1666
1667
/* Sleep checking until interface is running.
1668
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
1670
if(interface_is_running(interface)){
1671
break;
1672
}
1673
struct timespec sleeptime = { .tv_nsec = 250000000 };
1674
ret = nanosleep(&sleeptime, NULL);
1675
if(ret == -1 and errno != EINTR){
1676
perror_plus("nanosleep");
1677
}
1678
}
1679
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
struct ifreq network;
1690
unsigned int if_index = if_nametoindex(interface);
1691
if(if_index == 0){
1692
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1693
errno = old_errno;
1694
return ENXIO;
1695
}
1696
if(interface_is_up(interface)){
1697
if(not get_flags(interface, &network) and debug){
1698
ret_errno = errno;
1699
fprintf_plus(stderr, "Failed to get flags for interface "
1700
"\"%s\"\n", interface);
1701
return ret_errno;
1702
}
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
1707
ret_errno = errno;
1708
perror_plus("socket");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
1713
if(debug){
1714
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1715
interface);
1716
}
1717
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
1726
1727
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
if(ret == -1){
1730
perror_plus("close");
1731
}
1732
1733
if(ret_setflags == -1){
1734
errno = ret_errno;
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
errno = old_errno;
1737
return ret_errno;
1738
}
1739
} else if(debug){
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
interface);
1742
}
1743
1744
errno = old_errno;
1745
return 0;
1746
}
1747
1748
1122
int main(int argc, char *argv[]){
1749
1123
AvahiSServiceBrowser *sb = NULL;
1750
error_t ret_errno;
1124
int error;
1751
1125
int ret;
1752
1126
intmax_t tmpmax;
1753
1127
char *tmp;
1754
1128
int exitcode = EXIT_SUCCESS;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
char *interfaces_to_take_down = NULL;
1758
size_t interfaces_to_take_down_size = 0;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1759
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1760
1136
bool tempdir_created = false;
1761
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1762
1138
const char *seckey = PATHDIR "/" SECKEY;
1763
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1766
1140
1767
1141
bool gnutls_initialized = false;
1768
1142
bool gpgme_initialized = false;
1769
1143
float delay = 2.5f;
1770
double retry_interval = 10; /* 10s between trying a server and
1771
retrying the same server again */
1772
1144
1773
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1774
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1780
1152
errno = 0;
1781
1153
ret = setgid(gid);
1782
1154
if(ret == -1){
1783
perror_plus("setgid");
1155
perror("setgid");
1784
1156
}
1785
1157
1786
1158
/* Lower user privileges (temporarily) */
1787
1159
errno = 0;
1788
1160
ret = seteuid(uid);
1789
1161
if(ret == -1){
1790
perror_plus("seteuid");
1162
perror("seteuid");
1791
1163
}
1792
1164
1793
1165
if(quit_now){
1828
1200
.arg = "SECONDS",
1829
1201
.doc = "Maximum delay to wait for interface startup",
1830
1202
.group = 2 },
1831
{ .name = "retry", .key = 132,
1832
.arg = "SECONDS",
1833
.doc = "Retry interval used when denied by the Mandos server",
1834
.group = 2 },
1835
{ .name = "network-hook-dir", .key = 133,
1836
.arg = "DIR",
1837
.doc = "Directory where network hooks are located",
1838
.group = 2 },
1839
1203
/*
1840
1204
* These reproduce what we would get without ARGP_NO_HELP
1841
1205
*/
1859
1223
connect_to = arg;
1860
1224
break;
1861
1225
case 'i': /* --interface */
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
1864
if(ret_errno != 0){
1865
argp_error(state, "%s", strerror(ret_errno));
1866
}
1226
interface = arg;
1867
1227
break;
1868
1228
case 's': /* --seckey */
1869
1229
seckey = arg;
1889
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
1890
1250
argp_error(state, "Bad delay");
1891
1251
}
1892
case 132: /* --retry */
1893
errno = 0;
1894
retry_interval = strtod(arg, &tmp);
1895
if(errno != 0 or tmp == arg or *tmp != '\0'
1896
or (retry_interval * 1000) > INT_MAX
1897
or retry_interval < 0){
1898
argp_error(state, "Bad retry interval");
1899
}
1900
break;
1901
case 133: /* --network-hook-dir */
1902
hookdir = arg;
1903
1252
break;
1904
1253
/*
1905
1254
* These reproduce what we would get without ARGP_NO_HELP
1912
1261
argp_state_help(state, state->out_stream,
1913
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1914
1263
case 'V': /* --version */
1915
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1916
1265
exit(argp_err_exit_status);
1917
1266
break;
1918
1267
default:
1933
1282
case ENOMEM:
1934
1283
default:
1935
1284
errno = ret;
1936
perror_plus("argp_parse");
1285
perror("argp_parse");
1937
1286
exitcode = EX_OSERR;
1938
1287
goto end;
1939
1288
case EINVAL:
1941
1290
goto end;
1942
1291
}
1943
1292
}
1944
1945
{
1946
/* Work around Debian bug #633582:
1947
<http://bugs.debian.org/633582> */
1948
1949
/* Re-raise priviliges */
1950
if(raise_privileges() == 0){
1951
struct stat st;
1952
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1954
int seckey_fd = open(seckey, O_RDONLY);
1955
if(seckey_fd == -1){
1956
perror_plus("open");
1957
} else {
1958
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1959
if(ret == -1){
1960
perror_plus("fstat");
1961
} else {
1962
if(S_ISREG(st.st_mode)
1963
and st.st_uid == 0 and st.st_gid == 0){
1964
ret = fchown(seckey_fd, uid, gid);
1965
if(ret == -1){
1966
perror_plus("fchown");
1967
}
1968
}
1969
}
1970
TEMP_FAILURE_RETRY(close(seckey_fd));
1971
}
1972
}
1973
1974
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1975
int pubkey_fd = open(pubkey, O_RDONLY);
1976
if(pubkey_fd == -1){
1977
perror_plus("open");
1978
} else {
1979
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1980
if(ret == -1){
1981
perror_plus("fstat");
1982
} else {
1983
if(S_ISREG(st.st_mode)
1984
and st.st_uid == 0 and st.st_gid == 0){
1985
ret = fchown(pubkey_fd, uid, gid);
1986
if(ret == -1){
1987
perror_plus("fchown");
1988
}
1989
}
1990
}
1991
TEMP_FAILURE_RETRY(close(pubkey_fd));
1992
}
1993
}
1994
1995
/* Lower privileges */
1996
errno = 0;
1997
ret = seteuid(uid);
1998
if(ret == -1){
1999
perror_plus("seteuid");
2000
}
2001
}
2002
}
2003
2004
/* Remove empty interface names */
2005
{
2006
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2008
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2012
" \"%s\"\n", interface);
2013
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2015
interface = NULL;
2016
}
2017
}
2018
}
2019
2020
/* Run network hooks */
2021
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2025
if(interfaces_hooks == NULL){
2026
perror_plus("malloc");
2027
goto end;
2028
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
2038
}
2039
1293
2040
1294
if(not debug){
2041
1295
avahi_set_log_function(empty_log);
2042
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
2043
1322
2044
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2045
1324
from the signal handler */
2046
1325
/* Initialize the pseudo-RNG for Avahi */
2047
1326
srand((unsigned int) time(NULL));
2048
simple_poll = avahi_simple_poll_new();
2049
if(simple_poll == NULL){
2050
fprintf_plus(stderr,
2051
"Avahi: Failed to create simple poll object.\n");
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2052
1330
exitcode = EX_UNAVAILABLE;
2053
1331
goto end;
2054
1332
}
2056
1334
sigemptyset(&sigterm_action.sa_mask);
2057
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2058
1336
if(ret == -1){
2059
perror_plus("sigaddset");
1337
perror("sigaddset");
2060
1338
exitcode = EX_OSERR;
2061
1339
goto end;
2062
1340
}
2063
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2064
1342
if(ret == -1){
2065
perror_plus("sigaddset");
1343
perror("sigaddset");
2066
1344
exitcode = EX_OSERR;
2067
1345
goto end;
2068
1346
}
2069
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2070
1348
if(ret == -1){
2071
perror_plus("sigaddset");
1349
perror("sigaddset");
2072
1350
exitcode = EX_OSERR;
2073
1351
goto end;
2074
1352
}
2078
1356
*/
2079
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2080
1358
if(ret == -1){
2081
perror_plus("sigaction");
1359
perror("sigaction");
2082
1360
return EX_OSERR;
2083
1361
}
2084
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2085
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2086
1364
if(ret == -1){
2087
perror_plus("sigaction");
1365
perror("sigaction");
2088
1366
exitcode = EX_OSERR;
2089
1367
goto end;
2090
1368
}
2091
1369
}
2092
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2093
1371
if(ret == -1){
2094
perror_plus("sigaction");
1372
perror("sigaction");
2095
1373
return EX_OSERR;
2096
1374
}
2097
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2098
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2099
1377
if(ret == -1){
2100
perror_plus("sigaction");
1378
perror("sigaction");
2101
1379
exitcode = EX_OSERR;
2102
1380
goto end;
2103
1381
}
2104
1382
}
2105
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2106
1384
if(ret == -1){
2107
perror_plus("sigaction");
1385
perror("sigaction");
2108
1386
return EX_OSERR;
2109
1387
}
2110
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2111
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2112
1390
if(ret == -1){
2113
perror_plus("sigaction");
1391
perror("sigaction");
2114
1392
exitcode = EX_OSERR;
2115
1393
goto end;
2116
1394
}
2117
1395
}
2118
1396
2119
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2122
/* Look for any good interfaces */
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2124
alphasort);
2125
if(ret >= 1){
2126
/* Add all found interfaces to interfaces list */
2127
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2129
direntries[i]->d_name);
2130
if(ret_errno != 0){
2131
perror_plus("argz_add");
2132
continue;
2133
}
2134
if(debug){
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
direntries[i]->d_name);
2137
}
2138
}
2139
free(direntries);
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
2140
1532
} else {
2141
free(direntries);
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2143
exitcode = EXIT_FAILURE;
2144
goto end;
2145
}
2146
}
2147
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2160
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2162
interface))){
2163
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2165
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2169
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2173
}
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
2174
1537
}
2175
1538
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
if(debug and (interfaces_to_take_down == NULL)){
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2181
}
2182
1539
}
2183
1540
2184
1541
if(quit_now){
2187
1544
2188
1545
ret = init_gnutls_global(pubkey, seckey);
2189
1546
if(ret == -1){
2190
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2191
1548
exitcode = EX_UNAVAILABLE;
2192
1549
goto end;
2193
1550
} else {
2198
1555
goto end;
2199
1556
}
2200
1557
1558
tempdir_created = true;
2201
1559
if(mkdtemp(tempdir) == NULL){
2202
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2203
1562
goto end;
2204
1563
}
2205
tempdir_created = true;
2206
1564
2207
1565
if(quit_now){
2208
1566
goto end;
2209
1567
}
2210
1568
2211
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
2212
fprintf_plus(stderr, "init_gpgme failed\n");
1570
fprintf(stderr, "init_gpgme failed\n");
2213
1571
exitcode = EX_UNAVAILABLE;
2214
1572
goto end;
2215
1573
} else {
2224
1582
/* Connect directly, do not use Zeroconf */
2225
1583
/* (Mainly meant for debugging) */
2226
1584
char *address = strrchr(connect_to, ':');
2227
2228
1585
if(address == NULL){
2229
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2230
1587
exitcode = EX_USAGE;
2231
1588
goto end;
2232
1589
}
2235
1592
goto end;
2236
1593
}
2237
1594
2238
in_port_t port;
1595
uint16_t port;
2239
1596
errno = 0;
2240
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2241
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2242
or tmpmax != (in_port_t)tmpmax){
2243
fprintf_plus(stderr, "Bad port number\n");
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2244
1601
exitcode = EX_USAGE;
2245
1602
goto end;
2246
1603
}
2249
1606
goto end;
2250
1607
}
2251
1608
2252
port = (in_port_t)tmpmax;
1609
port = (uint16_t)tmpmax;
2253
1610
*address = '\0';
1611
address = connect_to;
2254
1612
/* Colon in address indicates IPv6 */
2255
1613
int af;
2256
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2257
1615
af = AF_INET6;
2258
/* Accept [] around IPv6 address - see RFC 5952 */
2259
if(connect_to[0] == '[' and address[-1] == ']')
2260
{
2261
connect_to++;
2262
address[-1] = '\0';
2263
}
2264
1616
} else {
2265
1617
af = AF_INET;
2266
1618
}
2267
address = connect_to;
2268
1619
2269
1620
if(quit_now){
2270
1621
goto end;
2271
1622
}
2272
1623
2273
1624
while(not quit_now){
2274
1625
ret = start_mandos_communication(address, port, if_index, af);
2275
1626
if(quit_now or ret == 0){
2276
1627
break;
2277
1628
}
2278
if(debug){
2279
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
(int)retry_interval);
2281
}
2282
sleep((int)retry_interval);
2283
}
2284
1629
sleep(15);
1630
};
1631
2285
1632
if (not quit_now){
2286
1633
exitcode = EXIT_SUCCESS;
2287
1634
}
2288
1635
2289
1636
goto end;
2290
1637
}
2291
1638
2303
1650
config.publish_domain = 0;
2304
1651
2305
1652
/* Allocate a new server */
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2308
1656
2309
1657
/* Free the Avahi configuration data */
2310
1658
avahi_server_config_free(&config);
2312
1660
2313
1661
/* Check if creating the Avahi server object succeeded */
2314
1662
if(mc.server == NULL){
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2317
1665
exitcode = EX_UNAVAILABLE;
2318
1666
goto end;
2319
1667
}
2327
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2328
1676
NULL, 0, browse_callback, NULL);
2329
1677
if(sb == NULL){
2330
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2332
1680
exitcode = EX_UNAVAILABLE;
2333
1681
goto end;
2334
1682
}
2340
1688
/* Run the main loop */
2341
1689
2342
1690
if(debug){
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2344
}
2345
2346
ret = avahi_loop_with_timeout(simple_poll,
2347
(int)(retry_interval * 1000));
2348
if(debug){
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2350
(ret == 0) ? "successfully" : "with error");
2351
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2352
1695
2353
1696
end:
2354
1697
2355
1698
if(debug){
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2357
1700
}
2358
1701
2359
1702
/* Cleanup things */
2363
1706
if(mc.server != NULL)
2364
1707
avahi_server_free(mc.server);
2365
1708
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2368
1711
2369
1712
if(gnutls_initialized){
2370
1713
gnutls_certificate_free_credentials(mc.cred);
2376
1719
gpgme_release(mc.ctx);
2377
1720
}
2378
1721
2379
/* Cleans up the circular linked list of Mandos servers the client
2380
has seen */
2381
if(mc.current_server != NULL){
2382
mc.current_server->prev->next = NULL;
2383
while(mc.current_server != NULL){
2384
server *next = mc.current_server->next;
2385
free(mc.current_server);
2386
mc.current_server = next;
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
2387
1729
}
2388
}
2389
2390
/* Re-raise priviliges */
2391
{
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2408
1739
}
2409
1740
}
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
2413
1750
}
2414
1751
}
2415
2416
lower_privileges_permanently();
2417
1752
}
2418
1753
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2421
2422
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2423
1755
if(tempdir_created){
2424
struct dirent **direntries = NULL;
2425
struct dirent *direntry = NULL;
2426
int numentries = scandir(tempdir, &direntries, notdotentries,
2427
alphasort);
2428
if (numentries > 0){
2429
for(int i = 0; i < numentries; i++){
2430
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2431
1776
char *fullname = NULL;
2432
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2433
1778
direntry->d_name);
2434
1779
if(ret < 0){
2435
perror_plus("asprintf");
1780
perror("asprintf");
2436
1781
continue;
2437
1782
}
2438
1783
ret = remove(fullname);
2439
1784
if(ret == -1){
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2442
1787
}
2443
1788
free(fullname);
2444
1789
}
2445
}
2446
2447
/* need to clean even if 0 because man page doesn't specify */
2448
free(direntries);
2449
if (numentries == -1){
2450
perror_plus("scandir");
1790
closedir(d);
2451
1791
}
2452
1792
ret = rmdir(tempdir);
2453
1793
if(ret == -1 and errno != ENOENT){
2454
perror_plus("rmdir");
1794
perror("rmdir");
2455
1795
}
2456
1796
}
2457
1797
2462
1802
&old_sigterm_action,
2463
1803
NULL));
2464
1804
if(ret == -1){
2465
perror_plus("sigaction");
1805
perror("sigaction");
2466
1806
}
2467
1807
do {
2468
1808
ret = raise(signal_received);
2469
1809
} while(ret != 0 and errno == EINTR);
2470
1810
if(ret != 0){
2471
perror_plus("raise");
1811
perror("raise");
2472
1812
abort();
2473
1813
}
2474
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0