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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);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
743
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
748
687
if(if_index == AVAHI_IF_UNSPEC){
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
751
690
errno = EINVAL;
752
691
goto mandos_end;
753
692
}
755
694
to.in6.sin6_scope_id = (uint32_t)if_index;
756
695
}
757
696
} else {
758
to.in.sin_port = htons(port);
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
759
700
}
760
701
761
702
if(quit_now){
769
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
711
perror_plus("if_indextoname");
771
712
} else {
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
774
715
}
775
716
} else {
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
778
719
}
779
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
790
731
perror_plus("inet_ntop");
791
732
} else {
792
733
if(strcmp(addrstr, ip) != 0){
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
794
735
}
795
736
}
796
737
}
824
765
while(true){
825
766
size_t out_size = strlen(out);
826
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
827
out_size - written));
768
out_size - written));
828
769
if(ret == -1){
829
770
int e = errno;
830
771
perror_plus("write");
850
791
}
851
792
852
793
if(debug){
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
854
795
}
855
796
856
797
if(quit_now){
858
799
goto mandos_end;
859
800
}
860
801
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(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);
866
804
867
805
if(quit_now){
868
806
errno = EINTR;
879
817
880
818
if(ret != GNUTLS_E_SUCCESS){
881
819
if(debug){
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
883
821
gnutls_perror(ret);
884
822
}
885
823
errno = EPROTO;
889
827
/* Read OpenPGP packet that contains the wanted password */
890
828
891
829
if(debug){
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
894
832
}
895
833
896
834
while(true){
901
839
}
902
840
903
841
buffer_capacity = incbuffer(&buffer, buffer_length,
904
buffer_capacity);
842
buffer_capacity);
905
843
if(buffer_capacity == 0){
906
844
int e = errno;
907
845
perror_plus("incbuffer");
934
872
}
935
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
936
874
if(ret < 0){
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
939
876
gnutls_perror(ret);
940
877
errno = EPROTO;
941
878
goto mandos_end;
942
879
}
943
880
break;
944
881
default:
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
947
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
948
885
errno = EIO;
949
886
goto mandos_end;
954
891
}
955
892
956
893
if(debug){
957
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
958
895
}
959
896
960
897
if(quit_now){
972
909
973
910
if(buffer_length > 0){
974
911
ssize_t decrypted_buffer_size;
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
977
915
if(decrypted_buffer_size >= 0){
978
916
979
917
written = 0;
989
927
if(ret == 0 and ferror(stdout)){
990
928
int e = errno;
991
929
if(debug){
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
994
932
}
995
933
errno = e;
996
934
goto mandos_end;
1040
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1042
980
flags,
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1047
983
1048
984
/* Called whenever a service has been resolved successfully or
1049
985
timed out */
1055
991
switch(event){
1056
992
default:
1057
993
case AVAHI_RESOLVER_FAILURE:
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((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)));
1063
997
break;
1064
998
1065
999
case AVAHI_RESOLVER_FOUND:
1067
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1068
1002
avahi_address_snprint(ip, sizeof(ip), address);
1069
1003
if(debug){
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
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);
1073
1007
}
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1078
1010
if(ret == 0){
1079
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1080
1012
} else {
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1087
1015
}
1088
1016
}
1089
1017
}
1099
1027
const char *domain,
1100
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1101
1029
flags,
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1106
1032
1107
1033
/* Called whenever a new services becomes available on the LAN or
1108
1034
is removed from the LAN */
1115
1041
default:
1116
1042
case AVAHI_BROWSER_FAILURE:
1117
1043
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
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);
1122
1047
return;
1123
1048
1124
1049
case AVAHI_BROWSER_NEW:
1127
1052
the callback function is called the Avahi server will free the
1128
1053
resolver for us. */
1129
1054
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((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)));
1138
1060
break;
1139
1061
1140
1062
case AVAHI_BROWSER_REMOVE:
1143
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1144
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1145
1067
if(debug){
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1148
1069
}
1149
1070
break;
1150
1071
}
1159
1080
signal_received = sig;
1160
1081
int old_errno = errno;
1161
1082
/* set main loop to exit */
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1164
1085
}
1165
1086
errno = old_errno;
1166
1087
}
1167
1088
1168
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
1090
int ret;
1170
error_t ret_errno;
1171
1091
1172
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
1093
if(s < 0){
1174
ret_errno = errno;
1175
1094
perror_plus("socket");
1176
errno = ret_errno;
1177
1095
return false;
1178
1096
}
1179
1097
strcpy(ifr->ifr_name, ifname);
1180
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
1099
if(ret == -1){
1182
1100
if(debug){
1183
ret_errno = errno;
1184
1101
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
1102
}
1187
1103
return false;
1188
1104
}
1194
1110
/* Reject the loopback device */
1195
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1196
1112
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1199
1115
}
1200
1116
return false;
1201
1117
}
1202
1118
/* Accept point-to-point devices only if connect_to is specified */
1203
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1204
1120
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1207
1123
}
1208
1124
return true;
1209
1125
}
1210
1126
/* Otherwise, reject non-broadcast-capable devices */
1211
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1212
1128
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1215
1131
}
1216
1132
return false;
1217
1133
}
1218
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
1135
if(ifr->ifr_flags & IFF_NOARP){
1220
1136
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1223
1138
}
1224
1139
return false;
1225
1140
}
1226
1141
1227
1142
/* Accept this device */
1228
1143
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1230
1145
}
1231
1146
return true;
1232
1147
}
1244
1159
struct ifreq ifr;
1245
1160
if(not get_flags(if_entry->d_name, &ifr)){
1246
1161
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1255
}
1256
return 1;
1257
}
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
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;
1289
1215
}
1290
1216
1291
1217
int notdotentries(const struct dirent *direntry){
1302
1228
/* Is this directory entry a runnable program? */
1303
1229
int runnable_hook(const struct dirent *direntry){
1304
1230
int ret;
1305
size_t sret;
1306
1231
struct stat st;
1307
1232
1308
1233
if((direntry->d_name)[0] == '\0'){
1310
1235
return 0;
1311
1236
}
1312
1237
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
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);
1334
1255
if(ret == -1){
1335
1256
if(debug){
1336
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1337
1258
}
1338
1259
return 0;
1339
1260
}
1340
1261
if(not (S_ISREG(st.st_mode))){
1341
1262
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
1263
return 0;
1347
1264
}
1348
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
1266
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
1267
return 0;
1355
1268
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
1269
return 1;
1361
1270
}
1362
1271
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1365
1273
int ret;
1366
1274
struct timespec now;
1367
1275
struct timespec waited_time;
1368
1276
intmax_t block_time;
1369
1277
1370
1278
while(true){
1371
if(mc->current_server == NULL){
1279
if(mc.current_server == NULL){
1372
1280
if (debug){
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1375
1283
}
1376
1284
ret = avahi_simple_poll_iterate(s, -1);
1377
1285
} else {
1378
1286
if (debug){
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1381
1289
}
1382
1290
/* the current time */
1383
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1388
1296
/* Calculating in ms how long time between now and server
1389
1297
who we visted longest time ago. Now - last seen. */
1390
1298
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1299
- mc.current_server->last_seen.tv_sec);
1392
1300
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1301
- mc.current_server->last_seen.tv_nsec);
1394
1302
/* total time is 10s/10,000ms.
1395
1303
Converting to s from ms by dividing by 1,000,
1396
1304
and ns to ms by dividing by 1,000,000. */
1399
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1400
1308
1401
1309
if (debug){
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1404
1311
}
1405
1312
1406
1313
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
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);
1411
1318
if(ret == 0){
1412
avahi_simple_poll_quit(s);
1319
avahi_simple_poll_quit(mc.simple_poll);
1413
1320
return 0;
1414
1321
}
1415
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1323
&mc.current_server->last_seen);
1417
1324
if(ret == -1){
1418
1325
perror_plus("clock_gettime");
1419
1326
return -1;
1420
1327
}
1421
mc->current_server = mc->current_server->next;
1328
mc.current_server = mc.current_server->next;
1422
1329
block_time = 0; /* Call avahi to find new Mandos
1423
1330
servers, but don't block */
1424
1331
}
1426
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1427
1334
}
1428
1335
if(ret != 0){
1429
if (ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1430
1337
return (ret != 1) ? ret : 0;
1431
1338
}
1432
1339
}
1433
1340
}
1434
1341
}
1435
1342
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1793
1343
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
1344
AvahiSServiceBrowser *sb = NULL;
1799
error_t ret_errno;
1345
int error;
1800
1346
int ret;
1801
1347
intmax_t tmpmax;
1802
1348
char *tmp;
1803
1349
int exitcode = EXIT_SUCCESS;
1804
char *interfaces_to_take_down = NULL;
1805
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;
1806
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1807
1357
bool tempdir_created = false;
1808
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1809
1359
const char *seckey = PATHDIR "/" SECKEY;
1810
1360
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1813
1361
1814
1362
bool gnutls_initialized = false;
1815
1363
bool gpgme_initialized = false;
1877
1425
.group = 2 },
1878
1426
{ .name = "retry", .key = 132,
1879
1427
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1428
.doc = "Retry interval used when denied by the mandos server",
1885
1429
.group = 2 },
1886
1430
/*
1887
1431
* These reproduce what we would get without ARGP_NO_HELP
1906
1450
connect_to = arg;
1907
1451
break;
1908
1452
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1453
interface = arg;
1914
1454
break;
1915
1455
case 's': /* --seckey */
1916
1456
seckey = arg;
1945
1485
argp_error(state, "Bad retry interval");
1946
1486
}
1947
1487
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1951
1488
/*
1952
1489
* These reproduce what we would get without ARGP_NO_HELP
1953
1490
*/
1959
1496
argp_state_help(state, state->out_stream,
1960
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1498
case 'V': /* --version */
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1963
1500
exit(argp_err_exit_status);
1964
1501
break;
1965
1502
default:
1992
1529
{
1993
1530
/* Work around Debian bug #633582:
1994
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1995
1533
1996
1534
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
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){
2070
1620
goto end;
2071
1621
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
2080
}
1622
}
1623
close(devnull);
2081
1624
}
2082
1625
2083
1626
if(not debug){
2084
1627
avahi_set_log_function(empty_log);
2085
1628
}
2086
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
2087
1662
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1663
from the signal handler */
2089
1664
/* Initialize the pseudo-RNG for Avahi */
2090
1665
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"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");
2095
1669
exitcode = EX_UNAVAILABLE;
2096
1670
goto end;
2097
1671
}
2159
1733
}
2160
1734
}
2161
1735
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
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");
2208
1821
}
2209
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){
2210
1840
break;
2211
1841
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
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
}
2237
1879
}
2238
1880
2239
1881
if(quit_now){
2240
1882
goto end;
2241
1883
}
2242
1884
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1885
ret = init_gnutls_global(pubkey, seckey);
2244
1886
if(ret == -1){
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
1887
fprintf(stderr, "init_gnutls_global failed\n");
2246
1888
exitcode = EX_UNAVAILABLE;
2247
1889
goto end;
2248
1890
} else {
2263
1905
goto end;
2264
1906
}
2265
1907
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
1908
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
fprintf(stderr, "init_gpgme failed\n");
2268
1910
exitcode = EX_UNAVAILABLE;
2269
1911
goto end;
2270
1912
} else {
2279
1921
/* Connect directly, do not use Zeroconf */
2280
1922
/* (Mainly meant for debugging) */
2281
1923
char *address = strrchr(connect_to, ':');
2282
2283
1924
if(address == NULL){
2284
fprintf_plus(stderr, "No colon in address\n");
1925
fprintf(stderr, "No colon in address\n");
2285
1926
exitcode = EX_USAGE;
2286
1927
goto end;
2287
1928
}
2290
1931
goto end;
2291
1932
}
2292
1933
2293
in_port_t port;
1934
uint16_t port;
2294
1935
errno = 0;
2295
1936
tmpmax = strtoimax(address+1, &tmp, 10);
2296
1937
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
1938
or tmpmax != (uint16_t)tmpmax){
1939
fprintf(stderr, "Bad port number\n");
2299
1940
exitcode = EX_USAGE;
2300
1941
goto end;
2301
1942
}
2302
1943
2303
1944
if(quit_now){
2304
1945
goto end;
2305
1946
}
2306
1947
2307
port = (in_port_t)tmpmax;
1948
port = (uint16_t)tmpmax;
2308
1949
*address = '\0';
2309
1950
/* Colon in address indicates IPv6 */
2310
1951
int af;
2326
1967
}
2327
1968
2328
1969
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
1970
ret = start_mandos_communication(address, port, if_index, af);
2331
1971
if(quit_now or ret == 0){
2332
1972
break;
2333
1973
}
2334
1974
if(debug){
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
2337
1977
}
2338
sleep((unsigned int)retry_interval);
1978
sleep((int)retry_interval);
2339
1979
}
2340
1980
2341
1981
if (not quit_now){
2359
1999
config.publish_domain = 0;
2360
2000
2361
2001
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2002
mc.server = avahi_server_new(avahi_simple_poll_get
2003
(mc.simple_poll), &config, NULL,
2004
NULL, &error);
2364
2005
2365
2006
/* Free the Avahi configuration data */
2366
2007
avahi_server_config_free(&config);
2368
2009
2369
2010
/* Check if creating the Avahi server object succeeded */
2370
2011
if(mc.server == NULL){
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
2012
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
avahi_strerror(error));
2373
2014
exitcode = EX_UNAVAILABLE;
2374
2015
goto end;
2375
2016
}
2381
2022
/* Create the Avahi service browser */
2382
2023
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
2024
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
2025
NULL, 0, browse_callback, NULL);
2386
2026
if(sb == NULL){
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
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)));
2389
2029
exitcode = EX_UNAVAILABLE;
2390
2030
goto end;
2391
2031
}
2397
2037
/* Run the main loop */
2398
2038
2399
2039
if(debug){
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
2040
fprintf(stderr, "Starting Avahi loop search\n");
2401
2041
}
2402
2042
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2405
2045
if(debug){
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2408
2048
}
2409
2049
2410
2050
end:
2411
2051
2412
2052
if(debug){
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2053
fprintf(stderr, "%s exiting\n", argv[0]);
2414
2054
}
2415
2055
2416
2056
/* Cleanup things */
2417
free(mc.interfaces);
2418
2419
2057
if(sb != NULL)
2420
2058
avahi_s_service_browser_free(sb);
2421
2059
2422
2060
if(mc.server != NULL)
2423
2061
avahi_server_free(mc.server);
2424
2062
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2063
if(mc.simple_poll != NULL)
2064
avahi_simple_poll_free(mc.simple_poll);
2427
2065
2428
2066
if(gnutls_initialized){
2429
2067
gnutls_certificate_free_credentials(mc.cred);
2434
2072
if(gpgme_initialized){
2435
2073
gpgme_release(mc.ctx);
2436
2074
}
2437
2075
2438
2076
/* Cleans up the circular linked list of Mandos servers the client
2439
2077
has seen */
2440
2078
if(mc.current_server != NULL){
2446
2084
}
2447
2085
}
2448
2086
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
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");
2467
2106
}
2468
2107
}
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" 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");
2472
2117
}
2473
2118
}
2474
2475
lower_privileges_permanently();
2476
2119
}
2477
2120
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
2481
2121
/* Removes the GPGME temp directory and all files inside */
2482
2122
if(tempdir_created){
2483
2123
struct dirent **direntries = NULL;
2496
2136
}
2497
2137
ret = remove(fullname);
2498
2138
if(ret == -1){
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2139
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2140
strerror(errno));
2501
2141
}
2502
2142
free(fullname);
2503
2143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0