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- Committer: teddy at bsnet
- Date: 2011-11-11 15:05:27 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111111150527-hdlgk1hkubtbth10
* plugins.d/mandos-client.c (good_interface): Add error message.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
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() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
setgid(), pause() */
76
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
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
88
95
89
#ifdef __linux__
96
90
#include <sys/klog.h> /* klogctl() */
114
108
init_gnutls_session(),
115
109
GNUTLS_* */
116
110
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
119
113
120
114
/* GPGME */
121
115
#include <gpgme.h> /* All GPGME types, constants and
137
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
132
static const char sys_class_net[] = "/sys/class/net";
139
133
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
134
144
135
/* Doubly linked list that need to be circularly linked when used */
145
136
typedef struct server{
146
137
const char *ip;
147
in_port_t port;
138
uint16_t port;
148
139
AvahiIfIndex if_index;
149
140
int af;
150
141
struct timespec last_seen;
154
145
155
146
/* Used for passing in values through the Avahi callback functions */
156
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
157
149
AvahiServer *server;
158
150
gnutls_certificate_credentials_t cred;
159
151
unsigned int dh_bits;
161
153
const char *priority;
162
154
gpgme_ctx_t ctx;
163
155
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
156
} mandos_context;
167
157
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
170
163
171
164
sig_atomic_t quit_now = 0;
172
165
int signal_received = 0;
173
166
174
167
/* Function to use when printing errors */
175
168
void perror_plus(const char *print_text){
176
int e = errno;
177
169
fprintf(stderr, "Mandos plugin %s: ",
178
170
program_invocation_short_name);
179
errno = e;
180
171
perror(print_text);
181
172
}
182
173
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
174
/*
194
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
176
* bytes. "buffer_capacity" is how much is currently allocated,
196
177
* "buffer_length" is how much is already used.
197
178
*/
198
179
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
180
size_t buffer_capacity){
200
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
183
if(buffer == NULL){
208
189
}
209
190
210
191
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
213
195
int ret;
214
196
server *new_server = malloc(sizeof(server));
215
197
if(new_server == NULL){
216
198
perror_plus("malloc");
217
return false;
199
return -1;
218
200
}
219
201
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
223
205
if(new_server->ip == NULL){
224
206
perror_plus("strdup");
225
return false;
207
return -1;
226
208
}
227
209
/* Special case of first server */
228
if(*current_server == NULL){
210
if (mc.current_server == NULL){
229
211
new_server->next = new_server;
230
212
new_server->prev = new_server;
231
*current_server = new_server;
213
mc.current_server = new_server;
232
214
/* Place the new server last in the list */
233
215
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
236
218
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
219
mc.current_server->prev = new_server;
238
220
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
222
if(ret == -1){
241
223
perror_plus("clock_gettime");
242
return false;
224
return -1;
243
225
}
244
return true;
226
return 0;
245
227
}
246
228
247
229
/*
248
230
* Initialize GPGME.
249
231
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
252
234
gpgme_error_t rc;
253
235
gpgme_engine_info_t engine_info;
254
236
237
255
238
/*
256
239
* Helper function to insert pub and seckey to the engine keyring.
257
240
*/
268
251
269
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
253
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
273
256
return false;
274
257
}
275
258
276
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
277
260
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
280
263
return false;
281
264
}
282
265
289
272
}
290
273
291
274
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
293
276
}
294
277
295
278
/* Init GPGME */
296
279
gpgme_check_version(NULL);
297
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
281
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
301
284
return false;
302
285
}
303
286
304
287
/* Set GPGME home directory for the OpenPGP engine only */
305
288
rc = gpgme_get_engine_info(&engine_info);
306
289
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
309
292
return false;
310
293
}
311
294
while(engine_info != NULL){
317
300
engine_info = engine_info->next;
318
301
}
319
302
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
304
return false;
323
305
}
324
306
325
307
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
327
309
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
331
312
return false;
332
313
}
333
314
344
325
*/
345
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
327
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
328
char **plaintext){
349
329
gpgme_data_t dh_crypto, dh_plain;
350
330
gpgme_error_t rc;
351
331
ssize_t ret;
353
333
ssize_t plaintext_length = 0;
354
334
355
335
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
337
}
358
338
359
339
/* Create new GPGME data buffer from memory cryptotext */
360
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
341
0);
362
342
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));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
365
345
return -1;
366
346
}
367
347
368
348
/* Create new empty GPGME data buffer for the plaintext */
369
349
rc = gpgme_data_new(&dh_plain);
370
350
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));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
374
353
gpgme_data_release(dh_crypto);
375
354
return -1;
376
355
}
377
356
378
357
/* Decrypt data from the cryptotext data buffer to the plaintext
379
358
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
360
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
384
363
plaintext_length = -1;
385
364
if(debug){
386
365
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
388
367
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
369
} 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);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
395
374
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
397
376
}
398
377
gpgme_recipient_t recipient;
399
378
recipient = result->recipients;
400
379
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");
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
408
386
recipient = recipient->next;
409
387
}
410
388
}
413
391
}
414
392
415
393
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
395
}
418
396
419
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
404
*plaintext = NULL;
427
405
while(true){
428
406
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
431
409
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
435
413
}
436
414
437
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
428
}
451
429
452
430
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
454
432
for(ssize_t i = 0; i < plaintext_length; i++){
455
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
434
}
468
446
}
469
447
470
448
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
472
451
if(ret == NULL)
473
452
ret = "(unknown)";
474
453
return ret;
477
456
/* GnuTLS log function callback */
478
457
static void debuggnutls(__attribute__((unused)) int level,
479
458
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
481
460
}
482
461
483
462
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
463
const char *seckeyfilename){
486
464
int ret;
487
465
488
466
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
490
468
}
491
469
492
470
ret = gnutls_global_init();
493
471
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
496
474
return -1;
497
475
}
498
476
505
483
}
506
484
507
485
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
487
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
512
490
gnutls_global_deinit();
513
491
return -1;
514
492
}
515
493
516
494
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
521
498
}
522
499
523
500
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
525
502
GNUTLS_OPENPGP_FMT_BASE64);
526
503
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
532
509
goto globalfail;
533
510
}
534
511
535
512
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
537
514
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
541
517
goto globalfail;
542
518
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
520
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
547
523
goto globalfail;
548
524
}
549
525
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
527
552
528
return 0;
553
529
554
530
globalfail:
555
531
556
gnutls_certificate_free_credentials(mc->cred);
532
gnutls_certificate_free_credentials(mc.cred);
557
533
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
534
gnutls_dh_params_deinit(mc.dh_params);
559
535
return -1;
560
536
}
561
537
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
538
static int init_gnutls_session(gnutls_session_t *session){
564
539
int ret;
565
540
/* GnuTLS session creation */
566
541
do {
570
545
}
571
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
547
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
576
550
}
577
551
578
552
{
579
553
const char *err;
580
554
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
556
if(quit_now){
583
557
gnutls_deinit(*session);
584
558
return -1;
585
559
}
586
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
561
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
591
565
gnutls_deinit(*session);
592
566
return -1;
593
567
}
595
569
596
570
do {
597
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
572
mc.cred);
599
573
if(quit_now){
600
574
gnutls_deinit(*session);
601
575
return -1;
602
576
}
603
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
578
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
607
581
gnutls_deinit(*session);
608
582
return -1;
609
583
}
611
585
/* ignore client certificate if any. */
612
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
587
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
589
616
590
return 0;
617
591
}
621
595
__attribute__((unused)) const char *txt){}
622
596
623
597
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
625
599
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
600
int af){
627
601
int ret, tcp_sd = -1;
628
602
ssize_t sret;
629
603
union {
654
628
pf = PF_INET;
655
629
break;
656
630
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
658
632
errno = EINVAL;
659
633
return -1;
660
634
}
661
635
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
636
ret = init_gnutls_session(&session);
695
637
if(ret != 0){
696
638
return -1;
697
639
}
698
640
699
641
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
702
644
}
703
645
704
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
730
672
}
731
673
if(ret == 0){
732
674
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
734
676
errno = e;
735
677
goto mandos_end;
736
678
}
737
679
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
739
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
686
-Wunreachable-code*/
742
687
if(if_index == AVAHI_IF_UNSPEC){
743
fprintf_plus(stderr, "An IPv6 link-local address is"
744
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
745
690
errno = EINVAL;
746
691
goto mandos_end;
747
692
}
765
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
711
perror_plus("if_indextoname");
767
712
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
770
715
}
771
716
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
774
719
}
775
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
786
731
perror_plus("inet_ntop");
787
732
} else {
788
733
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
790
735
}
791
736
}
792
737
}
820
765
while(true){
821
766
size_t out_size = strlen(out);
822
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
823
out_size - written));
768
out_size - written));
824
769
if(ret == -1){
825
770
int e = errno;
826
771
perror_plus("write");
846
791
}
847
792
848
793
if(debug){
849
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
850
795
}
851
796
852
797
if(quit_now){
854
799
goto mandos_end;
855
800
}
856
801
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
862
804
863
805
if(quit_now){
864
806
errno = EINTR;
875
817
876
818
if(ret != GNUTLS_E_SUCCESS){
877
819
if(debug){
878
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
879
821
gnutls_perror(ret);
880
822
}
881
823
errno = EPROTO;
885
827
/* Read OpenPGP packet that contains the wanted password */
886
828
887
829
if(debug){
888
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
889
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
890
832
}
891
833
892
834
while(true){
897
839
}
898
840
899
841
buffer_capacity = incbuffer(&buffer, buffer_length,
900
buffer_capacity);
842
buffer_capacity);
901
843
if(buffer_capacity == 0){
902
844
int e = errno;
903
845
perror_plus("incbuffer");
930
872
}
931
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
874
if(ret < 0){
933
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
934
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
935
876
gnutls_perror(ret);
936
877
errno = EPROTO;
937
878
goto mandos_end;
938
879
}
939
880
break;
940
881
default:
941
fprintf_plus(stderr, "Unknown error while reading data from"
942
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
943
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
944
885
errno = EIO;
945
886
goto mandos_end;
950
891
}
951
892
952
893
if(debug){
953
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
954
895
}
955
896
956
897
if(quit_now){
968
909
969
910
if(buffer_length > 0){
970
911
ssize_t decrypted_buffer_size;
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
973
915
if(decrypted_buffer_size >= 0){
974
916
975
917
written = 0;
985
927
if(ret == 0 and ferror(stdout)){
986
928
int e = errno;
987
929
if(debug){
988
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
989
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
990
932
}
991
933
errno = e;
992
934
goto mandos_end;
1036
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
980
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1043
983
1044
984
/* Called whenever a service has been resolved successfully or
1045
985
timed out */
1051
991
switch(event){
1052
992
default:
1053
993
case AVAHI_RESOLVER_FAILURE:
1054
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1059
997
break;
1060
998
1061
999
case AVAHI_RESOLVER_FOUND:
1063
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1064
1002
avahi_address_snprint(ip, sizeof(ip), address);
1065
1003
if(debug){
1066
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1067
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
host_name, ip, (intmax_t)interface, port);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1069
1007
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1074
1010
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1076
1012
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1083
1015
}
1084
1016
}
1085
1017
}
1095
1027
const char *domain,
1096
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1029
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1102
1032
1103
1033
/* Called whenever a new services becomes available on the LAN or
1104
1034
is removed from the LAN */
1111
1041
default:
1112
1042
case AVAHI_BROWSER_FAILURE:
1113
1043
1114
fprintf_plus(stderr, "(Avahi browser) %s\n",
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1118
1047
return;
1119
1048
1120
1049
case AVAHI_BROWSER_NEW:
1123
1052
the callback function is called the Avahi server will free the
1124
1053
resolver for us. */
1125
1054
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
resolve_callback, mc) == NULL)
1130
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1134
1060
break;
1135
1061
1136
1062
case AVAHI_BROWSER_REMOVE:
1139
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1140
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1141
1067
if(debug){
1142
fprintf_plus(stderr, "No Mandos server found, still"
1143
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1144
1069
}
1145
1070
break;
1146
1071
}
1155
1080
signal_received = sig;
1156
1081
int old_errno = errno;
1157
1082
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1160
1085
}
1161
1086
errno = old_errno;
1162
1087
}
1163
1088
1164
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1090
int ret;
1166
error_t ret_errno;
1167
1091
1168
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1093
if(s < 0){
1170
ret_errno = errno;
1171
1094
perror_plus("socket");
1172
errno = ret_errno;
1173
1095
return false;
1174
1096
}
1175
1097
strcpy(ifr->ifr_name, ifname);
1176
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1099
if(ret == -1){
1178
1100
if(debug){
1179
ret_errno = errno;
1180
1101
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
1102
}
1183
1103
return false;
1184
1104
}
1190
1110
/* Reject the loopback device */
1191
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1192
1112
if(debug){
1193
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1194
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1195
1115
}
1196
1116
return false;
1197
1117
}
1198
1118
/* Accept point-to-point devices only if connect_to is specified */
1199
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1200
1120
if(debug){
1201
fprintf_plus(stderr, "Accepting point-to-point interface"
1202
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1203
1123
}
1204
1124
return true;
1205
1125
}
1206
1126
/* Otherwise, reject non-broadcast-capable devices */
1207
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1208
1128
if(debug){
1209
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1210
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1211
1131
}
1212
1132
return false;
1213
1133
}
1214
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1215
1135
if(ifr->ifr_flags & IFF_NOARP){
1216
1136
if(debug){
1217
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1218
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1219
1138
}
1220
1139
return false;
1221
1140
}
1222
1141
1223
1142
/* Accept this device */
1224
1143
if(debug){
1225
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1226
1145
}
1227
1146
return true;
1228
1147
}
1240
1159
struct ifreq ifr;
1241
1160
if(not get_flags(if_entry->d_name, &ifr)){
1242
1161
if(debug){
1243
fprintf_plus(stderr, "Failed to get flags for interface "
1244
"\"%s\"\n", if_entry->d_name);
1245
}
1246
return 0;
1247
}
1248
1249
if(not good_flags(if_entry->d_name, &ifr)){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1285
1215
}
1286
1216
1287
1217
int notdotentries(const struct dirent *direntry){
1298
1228
/* Is this directory entry a runnable program? */
1299
1229
int runnable_hook(const struct dirent *direntry){
1300
1230
int ret;
1301
size_t sret;
1302
1231
struct stat st;
1303
1232
1304
1233
if((direntry->d_name)[0] == '\0'){
1306
1235
return 0;
1307
1236
}
1308
1237
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
"abcdefghijklmnopqrstuvwxyz"
1311
"0123456789"
1312
"_-");
1313
if((direntry->d_name)[sret] != '\0'){
1314
/* Contains non-allowed characters */
1315
if(debug){
1316
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1317
direntry->d_name);
1318
}
1319
return 0;
1320
}
1321
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1330
1255
if(ret == -1){
1331
1256
if(debug){
1332
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1333
1258
}
1334
1259
return 0;
1335
1260
}
1336
1261
if(not (S_ISREG(st.st_mode))){
1337
1262
/* Not a regular file */
1338
if(debug){
1339
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1340
direntry->d_name);
1341
}
1342
1263
return 0;
1343
1264
}
1344
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1345
1266
/* Not executable */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1348
direntry->d_name);
1349
}
1350
1267
return 0;
1351
1268
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1356
1269
return 1;
1357
1270
}
1358
1271
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1273
int ret;
1362
1274
struct timespec now;
1363
1275
struct timespec waited_time;
1364
1276
intmax_t block_time;
1365
1277
1366
1278
while(true){
1367
if(mc->current_server == NULL){
1279
if(mc.current_server == NULL){
1368
1280
if (debug){
1369
fprintf_plus(stderr, "Wait until first server is found."
1370
" No timeout!\n");
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1371
1283
}
1372
1284
ret = avahi_simple_poll_iterate(s, -1);
1373
1285
} else {
1374
1286
if (debug){
1375
fprintf_plus(stderr, "Check current_server if we should run"
1376
" it, or wait\n");
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1377
1289
}
1378
1290
/* the current time */
1379
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1384
1296
/* Calculating in ms how long time between now and server
1385
1297
who we visted longest time ago. Now - last seen. */
1386
1298
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1299
- mc.current_server->last_seen.tv_sec);
1388
1300
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1301
- mc.current_server->last_seen.tv_nsec);
1390
1302
/* total time is 10s/10,000ms.
1391
1303
Converting to s from ms by dividing by 1,000,
1392
1304
and ns to ms by dividing by 1,000,000. */
1395
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1308
1397
1309
if (debug){
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
block_time);
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1400
1311
}
1401
1312
1402
1313
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1407
1318
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1319
avahi_simple_poll_quit(mc.simple_poll);
1409
1320
return 0;
1410
1321
}
1411
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1323
&mc.current_server->last_seen);
1413
1324
if(ret == -1){
1414
1325
perror_plus("clock_gettime");
1415
1326
return -1;
1416
1327
}
1417
mc->current_server = mc->current_server->next;
1328
mc.current_server = mc.current_server->next;
1418
1329
block_time = 0; /* Call avahi to find new Mandos
1419
1330
servers, but don't block */
1420
1331
}
1422
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1334
}
1424
1335
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1426
1337
return (ret != 1) ? ret : 0;
1427
1338
}
1428
1339
}
1429
1340
}
1430
1341
}
1431
1342
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1485
const float delay){
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1507
perror_plus("asprintf");
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1566
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1578
} else {
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
1615
}
1616
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
1343
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
1344
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1345
int error;
1796
1346
int ret;
1797
1347
intmax_t tmpmax;
1798
1348
char *tmp;
1799
1349
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1802
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1357
bool tempdir_created = false;
1804
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1359
const char *seckey = PATHDIR "/" SECKEY;
1806
1360
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1361
1810
1362
bool gnutls_initialized = false;
1811
1363
bool gpgme_initialized = false;
1873
1425
.group = 2 },
1874
1426
{ .name = "retry", .key = 132,
1875
1427
.arg = "SECONDS",
1876
.doc = "Retry interval used when denied by the Mandos server",
1877
.group = 2 },
1878
{ .name = "network-hook-dir", .key = 133,
1879
.arg = "DIR",
1880
.doc = "Directory where network hooks are located",
1428
.doc = "Retry interval used when denied by the mandos server",
1881
1429
.group = 2 },
1882
1430
/*
1883
1431
* These reproduce what we would get without ARGP_NO_HELP
1902
1450
connect_to = arg;
1903
1451
break;
1904
1452
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1453
interface = arg;
1910
1454
break;
1911
1455
case 's': /* --seckey */
1912
1456
seckey = arg;
1941
1485
argp_error(state, "Bad retry interval");
1942
1486
}
1943
1487
break;
1944
case 133: /* --network-hook-dir */
1945
hookdir = arg;
1946
break;
1947
1488
/*
1948
1489
* These reproduce what we would get without ARGP_NO_HELP
1949
1490
*/
1955
1496
argp_state_help(state, state->out_stream,
1956
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1957
1498
case 'V': /* --version */
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1959
1500
exit(argp_err_exit_status);
1960
1501
break;
1961
1502
default:
1988
1529
{
1989
1530
/* Work around Debian bug #633582:
1990
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1991
1533
1992
1534
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1994
struct stat st;
1995
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1997
int seckey_fd = open(seckey, O_RDONLY);
1998
if(seckey_fd == -1){
1999
perror_plus("open");
2000
} else {
2001
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2002
if(ret == -1){
2003
perror_plus("fstat");
2004
} else {
2005
if(S_ISREG(st.st_mode)
2006
and st.st_uid == 0 and st.st_gid == 0){
2007
ret = fchown(seckey_fd, uid, gid);
2008
if(ret == -1){
2009
perror_plus("fchown");
2010
}
2011
}
2012
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2014
}
2015
}
2016
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2019
if(pubkey_fd == -1){
2020
perror_plus("open");
2021
} else {
2022
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2023
if(ret == -1){
2024
perror_plus("fstat");
2025
} else {
2026
if(S_ISREG(st.st_mode)
2027
and st.st_uid == 0 and st.st_gid == 0){
2028
ret = fchown(pubkey_fd, uid, gid);
2029
if(ret == -1){
2030
perror_plus("fchown");
2031
}
2032
}
2033
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2038
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
2056
}
2057
}
2058
}
2059
2060
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
setenv("DEVICE", interface, 1);
1612
setenv("VERBOSE", debug ? "1" : "0", 1);
1613
setenv("MODE", "start", 1);
1614
/* setenv( XXX more here */
1615
ret = execl(fullname, direntry->d_name, "start", NULL);
1616
perror_plus("execl");
1617
}
1618
free(fullname);
1619
if(quit_now){
2066
1620
goto end;
2067
1621
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
1622
}
1623
close(devnull);
2077
1624
}
2078
1625
2079
1626
if(not debug){
2080
1627
avahi_set_log_function(empty_log);
2081
1628
}
2082
1629
1630
if(interface[0] == '\0'){
1631
struct dirent **direntries;
1632
/* First look for interfaces that are up */
1633
ret = scandir(sys_class_net, &direntries, up_interface,
1634
alphasort);
1635
if(ret == 0){
1636
/* No up interfaces, look for any good interfaces */
1637
free(direntries);
1638
ret = scandir(sys_class_net, &direntries, good_interface,
1639
alphasort);
1640
}
1641
if(ret >= 1){
1642
/* Pick the first interface returned */
1643
interface = strdup(direntries[0]->d_name);
1644
if(debug){
1645
fprintf(stderr, "Using interface \"%s\"\n", interface);
1646
}
1647
if(interface == NULL){
1648
perror_plus("malloc");
1649
free(direntries);
1650
exitcode = EXIT_FAILURE;
1651
goto end;
1652
}
1653
free(direntries);
1654
} else {
1655
free(direntries);
1656
fprintf(stderr, "Could not find a network interface\n");
1657
exitcode = EXIT_FAILURE;
1658
goto end;
1659
}
1660
}
1661
2083
1662
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1663
from the signal handler */
2085
1664
/* Initialize the pseudo-RNG for Avahi */
2086
1665
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
2089
fprintf_plus(stderr,
2090
"Avahi: Failed to create simple poll object.\n");
1666
mc.simple_poll = avahi_simple_poll_new();
1667
if(mc.simple_poll == NULL){
1668
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2091
1669
exitcode = EX_UNAVAILABLE;
2092
1670
goto end;
2093
1671
}
2155
1733
}
2156
1734
}
2157
1735
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
1736
/* If the interface is down, bring it up */
1737
if(strcmp(interface, "none") != 0){
1738
if_index = (AvahiIfIndex) if_nametoindex(interface);
1739
if(if_index == 0){
1740
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1741
exitcode = EX_UNAVAILABLE;
1742
goto end;
1743
}
1744
1745
if(quit_now){
1746
goto end;
1747
}
1748
1749
/* Re-raise priviliges */
1750
errno = 0;
1751
ret = seteuid(0);
1752
if(ret == -1){
1753
perror_plus("seteuid");
1754
}
1755
1756
#ifdef __linux__
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret = klogctl(8, NULL, 5);
1760
bool restore_loglevel = true;
1761
if(ret == -1){
1762
restore_loglevel = false;
1763
perror_plus("klogctl");
1764
}
1765
#endif /* __linux__ */
1766
1767
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1768
if(sd < 0){
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
1771
#ifdef __linux__
1772
if(restore_loglevel){
1773
ret = klogctl(7, NULL, 0);
1774
if(ret == -1){
1775
perror_plus("klogctl");
1776
}
1777
}
1778
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
goto end;
1786
}
1787
strcpy(network.ifr_name, interface);
1788
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1789
if(ret == -1){
1790
perror_plus("ioctl SIOCGIFFLAGS");
1791
#ifdef __linux__
1792
if(restore_loglevel){
1793
ret = klogctl(7, NULL, 0);
1794
if(ret == -1){
1795
perror_plus("klogctl");
1796
}
1797
}
1798
#endif /* __linux__ */
1799
exitcode = EX_OSERR;
1800
/* Lower privileges */
1801
errno = 0;
1802
ret = seteuid(uid);
1803
if(ret == -1){
1804
perror_plus("seteuid");
1805
}
1806
goto end;
1807
}
1808
if((network.ifr_flags & IFF_UP) == 0){
1809
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
1811
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1812
if(ret == -1){
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
1816
#ifdef __linux__
1817
if(restore_loglevel){
1818
ret = klogctl(7, NULL, 0);
1819
if(ret == -1){
1820
perror_plus("klogctl");
2204
1821
}
2205
1822
}
1823
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
}
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
1835
for(int i=0; i < delay * 4; i++){
1836
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1837
if(ret == -1){
1838
perror_plus("ioctl SIOCGIFFLAGS");
1839
} else if(network.ifr_flags & IFF_RUNNING){
2206
1840
break;
2207
1841
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1842
struct timespec sleeptime = { .tv_nsec = 250000000 };
1843
ret = nanosleep(&sleeptime, NULL);
1844
if(ret == -1 and errno != EINTR){
1845
perror_plus("nanosleep");
1846
}
1847
}
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1850
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
if(ret == -1){
1852
perror_plus("close");
1853
}
1854
}
1855
#ifdef __linux__
1856
if(restore_loglevel){
1857
/* Restores kernel loglevel to default */
1858
ret = klogctl(7, NULL, 0);
1859
if(ret == -1){
1860
perror_plus("klogctl");
1861
}
1862
}
1863
#endif /* __linux__ */
1864
/* Lower privileges */
1865
errno = 0;
1866
if(take_down_interface){
1867
/* Lower privileges */
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
} else {
1873
/* Lower privileges permanently */
1874
ret = setuid(uid);
1875
if(ret == -1){
1876
perror_plus("setuid");
1877
}
1878
}
2233
1879
}
2234
1880
2235
1881
if(quit_now){
2236
1882
goto end;
2237
1883
}
2238
1884
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
1885
ret = init_gnutls_global(pubkey, seckey);
2240
1886
if(ret == -1){
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
1887
fprintf(stderr, "init_gnutls_global failed\n");
2242
1888
exitcode = EX_UNAVAILABLE;
2243
1889
goto end;
2244
1890
} else {
2259
1905
goto end;
2260
1906
}
2261
1907
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2263
fprintf_plus(stderr, "init_gpgme failed\n");
1908
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
fprintf(stderr, "init_gpgme failed\n");
2264
1910
exitcode = EX_UNAVAILABLE;
2265
1911
goto end;
2266
1912
} else {
2275
1921
/* Connect directly, do not use Zeroconf */
2276
1922
/* (Mainly meant for debugging) */
2277
1923
char *address = strrchr(connect_to, ':');
2278
2279
1924
if(address == NULL){
2280
fprintf_plus(stderr, "No colon in address\n");
1925
fprintf(stderr, "No colon in address\n");
2281
1926
exitcode = EX_USAGE;
2282
1927
goto end;
2283
1928
}
2286
1931
goto end;
2287
1932
}
2288
1933
2289
in_port_t port;
1934
uint16_t port;
2290
1935
errno = 0;
2291
1936
tmpmax = strtoimax(address+1, &tmp, 10);
2292
1937
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2294
fprintf_plus(stderr, "Bad port number\n");
1938
or tmpmax != (uint16_t)tmpmax){
1939
fprintf(stderr, "Bad port number\n");
2295
1940
exitcode = EX_USAGE;
2296
1941
goto end;
2297
1942
}
2298
1943
2299
1944
if(quit_now){
2300
1945
goto end;
2301
1946
}
2302
1947
2303
port = (in_port_t)tmpmax;
1948
port = (uint16_t)tmpmax;
2304
1949
*address = '\0';
2305
1950
/* Colon in address indicates IPv6 */
2306
1951
int af;
2322
1967
}
2323
1968
2324
1969
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
1970
ret = start_mandos_communication(address, port, if_index, af);
2327
1971
if(quit_now or ret == 0){
2328
1972
break;
2329
1973
}
2330
1974
if(debug){
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
(int)retry_interval);
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
2333
1977
}
2334
sleep((unsigned int)retry_interval);
1978
sleep((int)retry_interval);
2335
1979
}
2336
1980
2337
1981
if (not quit_now){
2355
1999
config.publish_domain = 0;
2356
2000
2357
2001
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2002
mc.server = avahi_server_new(avahi_simple_poll_get
2003
(mc.simple_poll), &config, NULL,
2004
NULL, &error);
2360
2005
2361
2006
/* Free the Avahi configuration data */
2362
2007
avahi_server_config_free(&config);
2364
2009
2365
2010
/* Check if creating the Avahi server object succeeded */
2366
2011
if(mc.server == NULL){
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2012
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
avahi_strerror(error));
2369
2014
exitcode = EX_UNAVAILABLE;
2370
2015
goto end;
2371
2016
}
2377
2022
/* Create the Avahi service browser */
2378
2023
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
2024
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2025
NULL, 0, browse_callback, NULL);
2382
2026
if(sb == NULL){
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
avahi_strerror(avahi_server_errno(mc.server)));
2027
fprintf(stderr, "Failed to create service browser: %s\n",
2028
avahi_strerror(avahi_server_errno(mc.server)));
2385
2029
exitcode = EX_UNAVAILABLE;
2386
2030
goto end;
2387
2031
}
2393
2037
/* Run the main loop */
2394
2038
2395
2039
if(debug){
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2040
fprintf(stderr, "Starting Avahi loop search\n");
2397
2041
}
2398
2042
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2401
2045
if(debug){
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
(ret == 0) ? "successfully" : "with error");
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2404
2048
}
2405
2049
2406
2050
end:
2407
2051
2408
2052
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2053
fprintf(stderr, "%s exiting\n", argv[0]);
2410
2054
}
2411
2055
2412
2056
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
2057
if(sb != NULL)
2416
2058
avahi_s_service_browser_free(sb);
2417
2059
2418
2060
if(mc.server != NULL)
2419
2061
avahi_server_free(mc.server);
2420
2062
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2063
if(mc.simple_poll != NULL)
2064
avahi_simple_poll_free(mc.simple_poll);
2423
2065
2424
2066
if(gnutls_initialized){
2425
2067
gnutls_certificate_free_credentials(mc.cred);
2430
2072
if(gpgme_initialized){
2431
2073
gpgme_release(mc.ctx);
2432
2074
}
2433
2075
2434
2076
/* Cleans up the circular linked list of Mandos servers the client
2435
2077
has seen */
2436
2078
if(mc.current_server != NULL){
2442
2084
}
2443
2085
}
2444
2086
2445
/* Re-raise priviliges */
2446
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2087
/* XXX run network hooks "stop" here */
2088
2089
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
2094
if(ret == -1){
2095
perror_plus("seteuid");
2096
}
2097
if(geteuid() == 0){
2098
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2099
if(ret == -1){
2100
perror_plus("ioctl SIOCGIFFLAGS");
2101
} else if(network.ifr_flags & IFF_UP) {
2102
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2104
if(ret == -1){
2105
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2463
2106
}
2464
2107
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2108
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2109
if(ret == -1){
2110
perror_plus("close");
2111
}
2112
/* Lower privileges permanently */
2113
errno = 0;
2114
ret = setuid(uid);
2115
if(ret == -1){
2116
perror_plus("setuid");
2468
2117
}
2469
2118
}
2470
2471
lower_privileges_permanently();
2472
2119
}
2473
2120
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2476
2477
2121
/* Removes the GPGME temp directory and all files inside */
2478
2122
if(tempdir_created){
2479
2123
struct dirent **direntries = NULL;
2492
2136
}
2493
2137
ret = remove(fullname);
2494
2138
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2139
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2140
strerror(errno));
2497
2141
}
2498
2142
free(fullname);
2499
2143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0