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- Committer: Teddy Hogeborn
- Date: 2012-06-16 22:38:54 UTC
- Revision ID: teddy@recompile.se-20120616223854-mfxkg6fgqr56sma5
* plugins.d/mandos-client (mandos_context): Removed "simple_poll"
member.
(simple_poll): New global variable. All users changed.
member.
(simple_poll): New global variable. All users changed.
- files added:
- 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 © 2008-2010 Teddy Hogeborn
13
* Copyright © 2008-2010 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_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() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
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() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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() */
87
94
88
95
#ifdef __linux__
89
96
#include <sys/klog.h> /* klogctl() */
107
114
init_gnutls_session(),
108
115
GNUTLS_* */
109
116
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
112
119
113
120
/* GPGME */
114
121
#include <gpgme.h> /* All GPGME types, constants and
122
129
#define PATHDIR "/conf/conf.d/mandos"
123
130
#define SECKEY "seckey.txt"
124
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
133
126
134
bool debug = false;
127
135
static const char mandos_protocol_version[] = "1";
128
136
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
138
static const char sys_class_net[] = "/sys/class/net";
131
139
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;
132
154
133
155
/* Used for passing in values through the Avahi callback functions */
134
156
typedef struct {
135
AvahiSimplePoll *simple_poll;
136
157
AvahiServer *server;
137
158
gnutls_certificate_credentials_t cred;
138
159
unsigned int dh_bits;
139
160
gnutls_dh_params_t dh_params;
140
161
const char *priority;
141
162
gpgme_ctx_t ctx;
163
server *current_server;
142
164
} mandos_context;
143
165
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" };
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 };
148
171
149
172
sig_atomic_t quit_now = 0;
150
173
int signal_received = 0;
151
174
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
152
194
/*
153
195
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
196
* bytes. "buffer_capacity" is how much is currently allocated,
155
197
* "buffer_length" is how much is already used.
156
198
*/
157
199
size_t incbuffer(char **buffer, size_t buffer_length,
158
size_t buffer_capacity){
200
size_t buffer_capacity){
159
201
if(buffer_length + BUFFER_SIZE > buffer_capacity){
160
202
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
203
if(buffer == NULL){
166
208
return buffer_capacity;
167
209
}
168
210
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
169
248
/*
170
249
* Initialize GPGME.
171
250
*/
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
251
static bool init_gpgme(const char *seckey, const char *pubkey,
252
const char *tempdir){
174
253
gpgme_error_t rc;
175
254
gpgme_engine_info_t engine_info;
176
255
177
178
256
/*
179
257
* Helper function to insert pub and seckey to the engine keyring.
180
258
*/
185
263
186
264
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
265
if(fd == -1){
188
perror("open");
266
perror_plus("open");
189
267
return false;
190
268
}
191
269
192
270
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
271
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
196
274
return false;
197
275
}
198
276
199
277
rc = gpgme_op_import(mc.ctx, pgp_data);
200
278
if(rc != GPG_ERR_NO_ERROR){
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
203
281
return false;
204
282
}
205
283
206
284
ret = (int)TEMP_FAILURE_RETRY(close(fd));
207
285
if(ret == -1){
208
perror("close");
286
perror_plus("close");
209
287
}
210
288
gpgme_data_release(pgp_data);
211
289
return true;
212
290
}
213
291
214
292
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
293
fprintf_plus(stderr, "Initializing GPGME\n");
216
294
}
217
295
218
296
/* Init GPGME */
219
297
gpgme_check_version(NULL);
220
298
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
299
if(rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
300
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
224
302
return false;
225
303
}
226
304
227
/* Set GPGME home directory for the OpenPGP engine only */
305
/* Set GPGME home directory for the OpenPGP engine only */
228
306
rc = gpgme_get_engine_info(&engine_info);
229
307
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
308
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
232
310
return false;
233
311
}
234
312
while(engine_info != NULL){
240
318
engine_info = engine_info->next;
241
319
}
242
320
if(engine_info == NULL){
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
321
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
322
tempdir);
244
323
return false;
245
324
}
246
325
247
326
/* Create new GPGME "context" */
248
327
rc = gpgme_new(&(mc.ctx));
249
328
if(rc != GPG_ERR_NO_ERROR){
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
329
fprintf_plus(stderr, "Mandos plugin mandos-client: "
330
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
331
gpgme_strerror(rc));
252
332
return false;
253
333
}
254
334
273
353
ssize_t plaintext_length = 0;
274
354
275
355
if(debug){
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
277
357
}
278
358
279
359
/* Create new GPGME data buffer from memory cryptotext */
280
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
361
0);
282
362
if(rc != GPG_ERR_NO_ERROR){
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
285
365
return -1;
286
366
}
287
367
288
368
/* Create new empty GPGME data buffer for the plaintext */
289
369
rc = gpgme_data_new(&dh_plain);
290
370
if(rc != GPG_ERR_NO_ERROR){
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
293
374
gpgme_data_release(dh_crypto);
294
375
return -1;
295
376
}
298
379
data buffer */
299
380
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
381
if(rc != GPG_ERR_NO_ERROR){
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
303
384
plaintext_length = -1;
304
385
if(debug){
305
386
gpgme_decrypt_result_t result;
306
387
result = gpgme_op_decrypt_result(mc.ctx);
307
388
if(result == NULL){
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
309
390
} else {
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
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);
314
395
if(result->file_name != NULL){
315
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
316
397
}
317
398
gpgme_recipient_t recipient;
318
399
recipient = result->recipients;
319
400
while(recipient != NULL){
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");
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");
326
408
recipient = recipient->next;
327
409
}
328
410
}
331
413
}
332
414
333
415
if(debug){
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
335
417
}
336
418
337
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
420
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
421
perror_plus("gpgme_data_seek");
340
422
plaintext_length = -1;
341
423
goto decrypt_end;
342
424
}
344
426
*plaintext = NULL;
345
427
while(true){
346
428
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
348
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
349
431
if(plaintext_capacity == 0){
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
353
435
}
354
436
355
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
360
442
break;
361
443
}
362
444
if(ret < 0){
363
perror("gpgme_data_read");
445
perror_plus("gpgme_data_read");
364
446
plaintext_length = -1;
365
447
goto decrypt_end;
366
448
}
368
450
}
369
451
370
452
if(debug){
371
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
372
454
for(ssize_t i = 0; i < plaintext_length; i++){
373
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
374
456
}
386
468
}
387
469
388
470
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
391
472
if(ret == NULL)
392
473
ret = "(unknown)";
393
474
return ret;
396
477
/* GnuTLS log function callback */
397
478
static void debuggnutls(__attribute__((unused)) int level,
398
479
const char* string){
399
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
400
481
}
401
482
402
483
static int init_gnutls_global(const char *pubkeyfilename,
404
485
int ret;
405
486
406
487
if(debug){
407
fprintf(stderr, "Initializing GnuTLS\n");
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
408
489
}
409
490
410
491
ret = gnutls_global_init();
411
492
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
414
495
return -1;
415
496
}
416
497
423
504
}
424
505
425
506
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
427
508
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
433
511
gnutls_global_deinit();
434
512
return -1;
435
513
}
436
514
437
515
if(debug){
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
441
520
}
442
521
443
522
ret = gnutls_certificate_set_openpgp_key_file
444
523
(mc.cred, pubkeyfilename, seckeyfilename,
445
524
GNUTLS_OPENPGP_FMT_BASE64);
446
525
if(ret != GNUTLS_E_SUCCESS){
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));
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));
452
531
goto globalfail;
453
532
}
454
533
455
534
/* GnuTLS server initialization */
456
535
ret = gnutls_dh_params_init(&mc.dh_params);
457
536
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
460
540
goto globalfail;
461
541
}
462
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
543
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
466
546
goto globalfail;
467
547
}
468
548
488
568
}
489
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
570
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
493
574
}
494
575
495
576
{
502
583
}
503
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
585
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
508
589
gnutls_deinit(*session);
509
590
return -1;
510
591
}
519
600
}
520
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
602
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
524
605
gnutls_deinit(*session);
525
606
return -1;
526
607
}
538
619
__attribute__((unused)) const char *txt){}
539
620
540
621
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
622
static int start_mandos_communication(const char *ip, in_port_t port,
542
623
AvahiIfIndex if_index,
543
624
int af){
544
625
int ret, tcp_sd = -1;
571
652
pf = PF_INET;
572
653
break;
573
654
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
575
656
errno = EINVAL;
576
657
return -1;
577
658
}
582
663
}
583
664
584
665
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
587
668
}
588
669
589
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
671
if(tcp_sd < 0){
591
672
int e = errno;
592
perror("socket");
673
perror_plus("socket");
593
674
errno = e;
594
675
goto mandos_end;
595
676
}
609
690
}
610
691
if(ret < 0 ){
611
692
int e = errno;
612
perror("inet_pton");
693
perror_plus("inet_pton");
613
694
errno = e;
614
695
goto mandos_end;
615
696
}
616
697
if(ret == 0){
617
698
int e = errno;
618
fprintf(stderr, "Bad address: %s\n", ip);
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
619
700
errno = e;
620
701
goto mandos_end;
621
702
}
622
703
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
704
to.in6.sin6_port = htons(port);
627
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
707
-Wunreachable-code*/
630
708
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
633
711
errno = EINVAL;
634
712
goto mandos_end;
635
713
}
651
729
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
730
char interface[IF_NAMESIZE];
653
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
732
perror_plus("if_indextoname");
655
733
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
658
736
}
659
737
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
662
740
}
663
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
671
749
sizeof(addrstr));
672
750
}
673
751
if(pcret == NULL){
674
perror("inet_ntop");
752
perror_plus("inet_ntop");
675
753
} else {
676
754
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
678
756
}
679
757
}
680
758
}
692
770
if(ret < 0){
693
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
772
int e = errno;
695
perror("connect");
773
perror_plus("connect");
696
774
errno = e;
697
775
}
698
776
goto mandos_end;
708
786
while(true){
709
787
size_t out_size = strlen(out);
710
788
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
789
out_size - written));
712
790
if(ret == -1){
713
791
int e = errno;
714
perror("write");
792
perror_plus("write");
715
793
errno = e;
716
794
goto mandos_end;
717
795
}
734
812
}
735
813
736
814
if(debug){
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
738
816
}
739
817
740
818
if(quit_now){
742
820
goto mandos_end;
743
821
}
744
822
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
746
828
747
829
if(quit_now){
748
830
errno = EINTR;
759
841
760
842
if(ret != GNUTLS_E_SUCCESS){
761
843
if(debug){
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
763
845
gnutls_perror(ret);
764
846
}
765
847
errno = EPROTO;
769
851
/* Read OpenPGP packet that contains the wanted password */
770
852
771
853
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
774
856
}
775
857
776
858
while(true){
781
863
}
782
864
783
865
buffer_capacity = incbuffer(&buffer, buffer_length,
784
buffer_capacity);
866
buffer_capacity);
785
867
if(buffer_capacity == 0){
786
868
int e = errno;
787
perror("incbuffer");
869
perror_plus("incbuffer");
788
870
errno = e;
789
871
goto mandos_end;
790
872
}
814
896
}
815
897
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
898
if(ret < 0){
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
818
901
gnutls_perror(ret);
819
902
errno = EPROTO;
820
903
goto mandos_end;
821
904
}
822
905
break;
823
906
default:
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
826
909
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
910
errno = EIO;
828
911
goto mandos_end;
833
916
}
834
917
835
918
if(debug){
836
fprintf(stderr, "Closing TLS session\n");
919
fprintf_plus(stderr, "Closing TLS session\n");
837
920
}
838
921
839
922
if(quit_now){
851
934
852
935
if(buffer_length > 0){
853
936
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
856
938
&decrypted_buffer);
857
939
if(decrypted_buffer_size >= 0){
858
940
869
951
if(ret == 0 and ferror(stdout)){
870
952
int e = errno;
871
953
if(debug){
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
874
956
}
875
957
errno = e;
876
958
goto mandos_end;
895
977
if(e == 0){
896
978
e = errno;
897
979
}
898
perror("close");
980
perror_plus("close");
899
981
}
900
982
gnutls_deinit(session);
983
errno = e;
901
984
if(quit_now){
902
e = EINTR;
985
errno = EINTR;
903
986
retval = -1;
904
987
}
905
errno = e;
906
988
}
907
989
return retval;
908
990
}
921
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
1004
flags,
923
1005
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1006
if(r == NULL){
1007
return;
1008
}
925
1009
926
1010
/* Called whenever a service has been resolved successfully or
927
1011
timed out */
933
1017
switch(event){
934
1018
default:
935
1019
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
939
1024
break;
940
1025
941
1026
case AVAHI_RESOLVER_FOUND:
943
1028
char ip[AVAHI_ADDRESS_STR_MAX];
944
1029
avahi_address_snprint(ip, sizeof(ip), address);
945
1030
if(debug){
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);
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);
949
1034
}
950
int ret = start_mandos_communication(ip, port, interface,
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
951
1037
avahi_proto_to_af(proto));
952
1038
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
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
}
954
1046
}
955
1047
}
956
1048
}
967
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
1060
flags,
969
1061
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1062
if(b == NULL){
1063
return;
1064
}
971
1065
972
1066
/* Called whenever a new services becomes available on the LAN or
973
1067
is removed from the LAN */
980
1074
default:
981
1075
case AVAHI_BROWSER_FAILURE:
982
1076
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1078
avahi_strerror(avahi_server_errno(mc.server)));
1079
avahi_simple_poll_quit(simple_poll);
986
1080
return;
987
1081
988
1082
case AVAHI_BROWSER_NEW:
994
1088
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
1089
name, type, domain, protocol, 0,
996
1090
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1091
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1092
" %s\n", name,
1093
avahi_strerror(avahi_server_errno(mc.server)));
999
1094
break;
1000
1095
1001
1096
case AVAHI_BROWSER_REMOVE:
1004
1099
case AVAHI_BROWSER_ALL_FOR_NOW:
1005
1100
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1006
1101
if(debug){
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1102
fprintf_plus(stderr, "No Mandos server found, still"
1103
" searching...\n");
1008
1104
}
1009
1105
break;
1010
1106
}
1011
1107
}
1012
1108
1013
/* stop main loop after sigterm has been called */
1109
/* Signal handler that stops main loop after SIGTERM */
1014
1110
static void handle_sigterm(int sig){
1015
1111
if(quit_now){
1016
1112
return;
1018
1114
quit_now = 1;
1019
1115
signal_received = sig;
1020
1116
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1117
/* set main loop to exit */
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1023
1120
}
1024
1121
errno = old_errno;
1025
1122
}
1026
1123
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
1027
1190
/*
1028
1191
* This function determines if a directory entry in /sys/class/net
1029
1192
* corresponds to an acceptable network device.
1030
1193
* (This function is passed to scandir(3) as a filter function.)
1031
1194
*/
1032
1195
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
1196
if(if_entry->d_name[0] == '.'){
1042
1197
return 0;
1043
1198
}
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){
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
}
1312
if(debug){
1313
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1314
direntry->d_name);
1315
}
1316
return 1;
1317
}
1318
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)){
1070
1671
break;
1071
1672
}
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 */
1115
if(debug){
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1118
}
1119
return 1;
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;
1120
1746
}
1121
1747
1122
1748
int main(int argc, char *argv[]){
1123
1749
AvahiSServiceBrowser *sb = NULL;
1124
int error;
1750
error_t ret_errno;
1125
1751
int ret;
1126
1752
intmax_t tmpmax;
1127
1753
char *tmp;
1128
1754
int exitcode = EXIT_SUCCESS;
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;
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;
1135
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1136
1760
bool tempdir_created = false;
1137
1761
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1138
1762
const char *seckey = PATHDIR "/" SECKEY;
1139
1763
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1140
1766
1141
1767
bool gnutls_initialized = false;
1142
1768
bool gpgme_initialized = false;
1143
1769
float delay = 2.5f;
1770
double retry_interval = 10; /* 10s between trying a server and
1771
retrying the same server again */
1144
1772
1145
1773
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1146
1774
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1152
1780
errno = 0;
1153
1781
ret = setgid(gid);
1154
1782
if(ret == -1){
1155
perror("setgid");
1783
perror_plus("setgid");
1156
1784
}
1157
1785
1158
1786
/* Lower user privileges (temporarily) */
1159
1787
errno = 0;
1160
1788
ret = seteuid(uid);
1161
1789
if(ret == -1){
1162
perror("seteuid");
1790
perror_plus("seteuid");
1163
1791
}
1164
1792
1165
1793
if(quit_now){
1200
1828
.arg = "SECONDS",
1201
1829
.doc = "Maximum delay to wait for interface startup",
1202
1830
.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 },
1203
1839
/*
1204
1840
* These reproduce what we would get without ARGP_NO_HELP
1205
1841
*/
1223
1859
connect_to = arg;
1224
1860
break;
1225
1861
case 'i': /* --interface */
1226
interface = arg;
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
}
1227
1867
break;
1228
1868
case 's': /* --seckey */
1229
1869
seckey = arg;
1249
1889
if(errno != 0 or tmp == arg or *tmp != '\0'){
1250
1890
argp_error(state, "Bad delay");
1251
1891
}
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;
1252
1903
break;
1253
1904
/*
1254
1905
* These reproduce what we would get without ARGP_NO_HELP
1261
1912
argp_state_help(state, state->out_stream,
1262
1913
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1263
1914
case 'V': /* --version */
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
1915
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1265
1916
exit(argp_err_exit_status);
1266
1917
break;
1267
1918
default:
1282
1933
case ENOMEM:
1283
1934
default:
1284
1935
errno = ret;
1285
perror("argp_parse");
1936
perror_plus("argp_parse");
1286
1937
exitcode = EX_OSERR;
1287
1938
goto end;
1288
1939
case EINVAL:
1290
1941
goto end;
1291
1942
}
1292
1943
}
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
}
1293
2039
1294
2040
if(not debug){
1295
2041
avahi_set_log_function(empty_log);
1296
2042
}
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
}
1322
2043
1323
2044
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1324
2045
from the signal handler */
1325
2046
/* Initialize the pseudo-RNG for Avahi */
1326
2047
srand((unsigned int) time(NULL));
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");
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");
1330
2052
exitcode = EX_UNAVAILABLE;
1331
2053
goto end;
1332
2054
}
1334
2056
sigemptyset(&sigterm_action.sa_mask);
1335
2057
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1336
2058
if(ret == -1){
1337
perror("sigaddset");
2059
perror_plus("sigaddset");
1338
2060
exitcode = EX_OSERR;
1339
2061
goto end;
1340
2062
}
1341
2063
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1342
2064
if(ret == -1){
1343
perror("sigaddset");
2065
perror_plus("sigaddset");
1344
2066
exitcode = EX_OSERR;
1345
2067
goto end;
1346
2068
}
1347
2069
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1348
2070
if(ret == -1){
1349
perror("sigaddset");
2071
perror_plus("sigaddset");
1350
2072
exitcode = EX_OSERR;
1351
2073
goto end;
1352
2074
}
1356
2078
*/
1357
2079
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1358
2080
if(ret == -1){
1359
perror("sigaction");
2081
perror_plus("sigaction");
1360
2082
return EX_OSERR;
1361
2083
}
1362
2084
if(old_sigterm_action.sa_handler != SIG_IGN){
1363
2085
ret = sigaction(SIGINT, &sigterm_action, NULL);
1364
2086
if(ret == -1){
1365
perror("sigaction");
2087
perror_plus("sigaction");
1366
2088
exitcode = EX_OSERR;
1367
2089
goto end;
1368
2090
}
1369
2091
}
1370
2092
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1371
2093
if(ret == -1){
1372
perror("sigaction");
2094
perror_plus("sigaction");
1373
2095
return EX_OSERR;
1374
2096
}
1375
2097
if(old_sigterm_action.sa_handler != SIG_IGN){
1376
2098
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1377
2099
if(ret == -1){
1378
perror("sigaction");
2100
perror_plus("sigaction");
1379
2101
exitcode = EX_OSERR;
1380
2102
goto end;
1381
2103
}
1382
2104
}
1383
2105
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1384
2106
if(ret == -1){
1385
perror("sigaction");
2107
perror_plus("sigaction");
1386
2108
return EX_OSERR;
1387
2109
}
1388
2110
if(old_sigterm_action.sa_handler != SIG_IGN){
1389
2111
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1390
2112
if(ret == -1){
1391
perror("sigaction");
2113
perror_plus("sigaction");
1392
2114
exitcode = EX_OSERR;
1393
2115
goto end;
1394
2116
}
1395
2117
}
1396
2118
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
}
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);
1532
2140
} else {
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
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
}
1537
2174
}
1538
2175
}
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
}
1539
2182
}
1540
2183
1541
2184
if(quit_now){
1544
2187
1545
2188
ret = init_gnutls_global(pubkey, seckey);
1546
2189
if(ret == -1){
1547
fprintf(stderr, "init_gnutls_global failed\n");
2190
fprintf_plus(stderr, "init_gnutls_global failed\n");
1548
2191
exitcode = EX_UNAVAILABLE;
1549
2192
goto end;
1550
2193
} else {
1555
2198
goto end;
1556
2199
}
1557
2200
2201
if(mkdtemp(tempdir) == NULL){
2202
perror_plus("mkdtemp");
2203
goto end;
2204
}
1558
2205
tempdir_created = true;
1559
if(mkdtemp(tempdir) == NULL){
1560
tempdir_created = false;
1561
perror("mkdtemp");
1562
goto end;
1563
}
1564
2206
1565
2207
if(quit_now){
1566
2208
goto end;
1567
2209
}
1568
2210
1569
2211
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2212
fprintf_plus(stderr, "init_gpgme failed\n");
1571
2213
exitcode = EX_UNAVAILABLE;
1572
2214
goto end;
1573
2215
} else {
1582
2224
/* Connect directly, do not use Zeroconf */
1583
2225
/* (Mainly meant for debugging) */
1584
2226
char *address = strrchr(connect_to, ':');
2227
1585
2228
if(address == NULL){
1586
fprintf(stderr, "No colon in address\n");
2229
fprintf_plus(stderr, "No colon in address\n");
1587
2230
exitcode = EX_USAGE;
1588
2231
goto end;
1589
2232
}
1592
2235
goto end;
1593
2236
}
1594
2237
1595
uint16_t port;
2238
in_port_t port;
1596
2239
errno = 0;
1597
2240
tmpmax = strtoimax(address+1, &tmp, 10);
1598
2241
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2242
or tmpmax != (in_port_t)tmpmax){
2243
fprintf_plus(stderr, "Bad port number\n");
1601
2244
exitcode = EX_USAGE;
1602
2245
goto end;
1603
2246
}
1606
2249
goto end;
1607
2250
}
1608
2251
1609
port = (uint16_t)tmpmax;
2252
port = (in_port_t)tmpmax;
1610
2253
*address = '\0';
1611
address = connect_to;
1612
2254
/* Colon in address indicates IPv6 */
1613
2255
int af;
1614
if(strchr(address, ':') != NULL){
2256
if(strchr(connect_to, ':') != NULL){
1615
2257
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
}
1616
2264
} else {
1617
2265
af = AF_INET;
1618
2266
}
2267
address = connect_to;
1619
2268
1620
2269
if(quit_now){
1621
2270
goto end;
1622
2271
}
1623
2272
1624
2273
while(not quit_now){
1625
2274
ret = start_mandos_communication(address, port, if_index, af);
1626
2275
if(quit_now or ret == 0){
1627
2276
break;
1628
2277
}
1629
sleep(15);
1630
};
1631
2278
if(debug){
2279
fprintf_plus(stderr, "Retrying in %d seconds\n",
2280
(int)retry_interval);
2281
}
2282
sleep((int)retry_interval);
2283
}
2284
1632
2285
if (not quit_now){
1633
2286
exitcode = EXIT_SUCCESS;
1634
2287
}
1635
2288
1636
2289
goto end;
1637
2290
}
1638
2291
1650
2303
config.publish_domain = 0;
1651
2304
1652
2305
/* Allocate a new server */
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
1656
2308
1657
2309
/* Free the Avahi configuration data */
1658
2310
avahi_server_config_free(&config);
1660
2312
1661
2313
/* Check if creating the Avahi server object succeeded */
1662
2314
if(mc.server == NULL){
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2316
avahi_strerror(ret_errno));
1665
2317
exitcode = EX_UNAVAILABLE;
1666
2318
goto end;
1667
2319
}
1675
2327
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1676
2328
NULL, 0, browse_callback, NULL);
1677
2329
if(sb == NULL){
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2330
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2331
avahi_strerror(avahi_server_errno(mc.server)));
1680
2332
exitcode = EX_UNAVAILABLE;
1681
2333
goto end;
1682
2334
}
1688
2340
/* Run the main loop */
1689
2341
1690
2342
if(debug){
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
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
}
1695
2352
1696
2353
end:
1697
2354
1698
2355
if(debug){
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2356
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1700
2357
}
1701
2358
1702
2359
/* Cleanup things */
1706
2363
if(mc.server != NULL)
1707
2364
avahi_server_free(mc.server);
1708
2365
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
1711
2368
1712
2369
if(gnutls_initialized){
1713
2370
gnutls_certificate_free_credentials(mc.cred);
1719
2376
gpgme_release(mc.ctx);
1720
2377
}
1721
2378
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");
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;
1729
2387
}
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");
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");
1739
2408
}
1740
2409
}
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");
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
1750
2413
}
1751
2414
}
2415
2416
lower_privileges_permanently();
1752
2417
}
1753
2418
1754
/* Removes the temp directory used by GPGME */
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2421
2422
/* Removes the GPGME temp directory and all files inside */
1755
2423
if(tempdir_created){
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
}
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];
1776
2431
char *fullname = NULL;
1777
2432
ret = asprintf(&fullname, "%s/%s", tempdir,
1778
2433
direntry->d_name);
1779
2434
if(ret < 0){
1780
perror("asprintf");
2435
perror_plus("asprintf");
1781
2436
continue;
1782
2437
}
1783
2438
ret = remove(fullname);
1784
2439
if(ret == -1){
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2440
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2441
strerror(errno));
1787
2442
}
1788
2443
free(fullname);
1789
2444
}
1790
closedir(d);
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");
1791
2451
}
1792
2452
ret = rmdir(tempdir);
1793
2453
if(ret == -1 and errno != ENOENT){
1794
perror("rmdir");
2454
perror_plus("rmdir");
1795
2455
}
1796
2456
}
1797
2457
1802
2462
&old_sigterm_action,
1803
2463
NULL));
1804
2464
if(ret == -1){
1805
perror("sigaction");
2465
perror_plus("sigaction");
1806
2466
}
1807
2467
do {
1808
2468
ret = raise(signal_received);
1809
2469
} while(ret != 0 and errno == EINTR);
1810
2470
if(ret != 0){
1811
perror("raise");
2471
perror_plus("raise");
1812
2472
abort();
1813
2473
}
1814
2474
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0