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- Committer: Teddy Hogeborn
- Date: 2012-07-23 07:01:16 UTC
- Revision ID: teddy@recompile.se-20120723070116-m53ztbi619gj5txj
* plugins.d/mandos-client.xml: Fix minor grammar.
- files added:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
88
94
89
95
#ifdef __linux__
90
96
#include <sys/klog.h> /* klogctl() */
108
114
init_gnutls_session(),
109
115
GNUTLS_* */
110
116
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
113
119
114
120
/* GPGME */
115
121
#include <gpgme.h> /* All GPGME types, constants and
131
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
138
static const char sys_class_net[] = "/sys/class/net";
133
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
134
143
135
144
/* Doubly linked list that need to be circularly linked when used */
136
145
typedef struct server{
137
146
const char *ip;
138
uint16_t port;
147
in_port_t port;
139
148
AvahiIfIndex if_index;
140
149
int af;
141
150
struct timespec last_seen;
145
154
146
155
/* Used for passing in values through the Avahi callback functions */
147
156
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
157
AvahiServer *server;
150
158
gnutls_certificate_credentials_t cred;
151
159
unsigned int dh_bits;
153
161
const char *priority;
154
162
gpgme_ctx_t ctx;
155
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
156
166
} mandos_context;
157
167
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 };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
163
170
164
171
sig_atomic_t quit_now = 0;
165
172
int signal_received = 0;
166
173
167
174
/* Function to use when printing errors */
168
175
void perror_plus(const char *print_text){
176
int e = errno;
169
177
fprintf(stderr, "Mandos plugin %s: ",
170
178
program_invocation_short_name);
179
errno = e;
171
180
perror(print_text);
172
181
}
173
182
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 TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
174
193
/*
175
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
195
* bytes. "buffer_capacity" is how much is currently allocated,
177
196
* "buffer_length" is how much is already used.
178
197
*/
179
198
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
199
size_t buffer_capacity){
181
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
202
if(buffer == NULL){
189
208
}
190
209
191
210
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
195
213
int ret;
196
214
server *new_server = malloc(sizeof(server));
197
215
if(new_server == NULL){
198
216
perror_plus("malloc");
199
return -1;
217
return false;
200
218
}
201
219
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
220
.port = port,
221
.if_index = if_index,
222
.af = af };
205
223
if(new_server->ip == NULL){
206
224
perror_plus("strdup");
207
return -1;
225
return false;
208
226
}
209
227
/* Special case of first server */
210
if (mc.current_server == NULL){
228
if(*current_server == NULL){
211
229
new_server->next = new_server;
212
230
new_server->prev = new_server;
213
mc.current_server = new_server;
231
*current_server = new_server;
214
232
/* Place the new server last in the list */
215
233
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
218
236
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
220
238
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
222
240
if(ret == -1){
223
241
perror_plus("clock_gettime");
224
return -1;
242
return false;
225
243
}
226
return 0;
244
return true;
227
245
}
228
246
229
247
/*
230
248
* Initialize GPGME.
231
249
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
234
252
gpgme_error_t rc;
235
253
gpgme_engine_info_t engine_info;
236
254
237
238
255
/*
239
256
* Helper function to insert pub and seckey to the engine keyring.
240
257
*/
251
268
252
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
270
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
256
273
return false;
257
274
}
258
275
259
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
260
277
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
263
280
return false;
264
281
}
265
282
272
289
}
273
290
274
291
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
276
293
}
277
294
278
295
/* Init GPGME */
279
296
gpgme_check_version(NULL);
280
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
298
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
284
301
return false;
285
302
}
286
303
287
304
/* Set GPGME home directory for the OpenPGP engine only */
288
305
rc = gpgme_get_engine_info(&engine_info);
289
306
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
292
309
return false;
293
310
}
294
311
while(engine_info != NULL){
300
317
engine_info = engine_info->next;
301
318
}
302
319
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
304
322
return false;
305
323
}
306
324
307
325
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
309
327
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
312
331
return false;
313
332
}
314
333
325
344
*/
326
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
346
size_t crypto_size,
328
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
329
349
gpgme_data_t dh_crypto, dh_plain;
330
350
gpgme_error_t rc;
331
351
ssize_t ret;
333
353
ssize_t plaintext_length = 0;
334
354
335
355
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
357
}
338
358
339
359
/* Create new GPGME data buffer from memory cryptotext */
340
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
361
0);
342
362
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
345
365
return -1;
346
366
}
347
367
348
368
/* Create new empty GPGME data buffer for the plaintext */
349
369
rc = gpgme_data_new(&dh_plain);
350
370
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
353
374
gpgme_data_release(dh_crypto);
354
375
return -1;
355
376
}
356
377
357
378
/* Decrypt data from the cryptotext data buffer to the plaintext
358
379
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
381
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
363
384
plaintext_length = -1;
364
385
if(debug){
365
386
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
367
388
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
390
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
374
395
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
397
}
377
398
gpgme_recipient_t recipient;
378
399
recipient = result->recipients;
379
400
while(recipient != NULL){
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");
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");
386
408
recipient = recipient->next;
387
409
}
388
410
}
391
413
}
392
414
393
415
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
417
}
396
418
397
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
426
*plaintext = NULL;
405
427
while(true){
406
428
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
409
431
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
413
435
}
414
436
415
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
450
}
429
451
430
452
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
432
454
for(ssize_t i = 0; i < plaintext_length; i++){
433
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
456
}
446
468
}
447
469
448
470
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
451
472
if(ret == NULL)
452
473
ret = "(unknown)";
453
474
return ret;
456
477
/* GnuTLS log function callback */
457
478
static void debuggnutls(__attribute__((unused)) int level,
458
479
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
460
481
}
461
482
462
483
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
464
486
int ret;
465
487
466
488
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
468
490
}
469
491
470
492
ret = gnutls_global_init();
471
493
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
474
496
return -1;
475
497
}
476
498
483
505
}
484
506
485
507
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
509
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
490
512
gnutls_global_deinit();
491
513
return -1;
492
514
}
493
515
494
516
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
498
521
}
499
522
500
523
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
502
525
GNUTLS_OPENPGP_FMT_BASE64);
503
526
if(ret != GNUTLS_E_SUCCESS){
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));
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));
509
532
goto globalfail;
510
533
}
511
534
512
535
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
514
537
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
517
541
goto globalfail;
518
542
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
520
544
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
523
547
goto globalfail;
524
548
}
525
549
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
551
528
552
return 0;
529
553
530
554
globalfail:
531
555
532
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
533
557
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
535
559
return -1;
536
560
}
537
561
538
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
539
564
int ret;
540
565
/* GnuTLS session creation */
541
566
do {
545
570
}
546
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
572
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
550
576
}
551
577
552
578
{
553
579
const char *err;
554
580
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
582
if(quit_now){
557
583
gnutls_deinit(*session);
558
584
return -1;
559
585
}
560
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
587
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
565
591
gnutls_deinit(*session);
566
592
return -1;
567
593
}
569
595
570
596
do {
571
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
598
mc->cred);
573
599
if(quit_now){
574
600
gnutls_deinit(*session);
575
601
return -1;
576
602
}
577
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
604
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
581
607
gnutls_deinit(*session);
582
608
return -1;
583
609
}
585
611
/* ignore client certificate if any. */
586
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
613
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
589
615
590
616
return 0;
591
617
}
595
621
__attribute__((unused)) const char *txt){}
596
622
597
623
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
599
625
AvahiIfIndex if_index,
600
int af){
626
int af, mandos_context *mc){
601
627
int ret, tcp_sd = -1;
602
628
ssize_t sret;
603
629
union {
628
654
pf = PF_INET;
629
655
break;
630
656
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
658
errno = EINVAL;
633
659
return -1;
634
660
}
635
661
636
ret = init_gnutls_session(&session);
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);
637
695
if(ret != 0){
638
696
return -1;
639
697
}
640
698
641
699
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
644
702
}
645
703
646
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
672
730
}
673
731
if(ret == 0){
674
732
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
734
errno = e;
677
735
goto mandos_end;
678
736
}
679
737
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
738
to.in6.sin6_port = htons(port);
684
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
741
-Wunreachable-code*/
687
742
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
743
fprintf_plus(stderr, "An IPv6 link-local address is"
744
" incomplete without a network interface\n");
690
745
errno = EINVAL;
691
746
goto mandos_end;
692
747
}
710
765
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
766
perror_plus("if_indextoname");
712
767
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
715
770
}
716
771
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
719
774
}
720
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
731
786
perror_plus("inet_ntop");
732
787
} else {
733
788
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
735
790
}
736
791
}
737
792
}
765
820
while(true){
766
821
size_t out_size = strlen(out);
767
822
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
823
out_size - written));
769
824
if(ret == -1){
770
825
int e = errno;
771
826
perror_plus("write");
791
846
}
792
847
793
848
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
849
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
850
}
796
851
797
852
if(quit_now){
799
854
goto mandos_end;
800
855
}
801
856
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
804
862
805
863
if(quit_now){
806
864
errno = EINTR;
817
875
818
876
if(ret != GNUTLS_E_SUCCESS){
819
877
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
878
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
879
gnutls_perror(ret);
822
880
}
823
881
errno = EPROTO;
827
885
/* Read OpenPGP packet that contains the wanted password */
828
886
829
887
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
888
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
889
" %s\n", ip);
832
890
}
833
891
834
892
while(true){
839
897
}
840
898
841
899
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
900
buffer_capacity);
843
901
if(buffer_capacity == 0){
844
902
int e = errno;
845
903
perror_plus("incbuffer");
872
930
}
873
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
932
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
933
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
934
"***\n");
876
935
gnutls_perror(ret);
877
936
errno = EPROTO;
878
937
goto mandos_end;
879
938
}
880
939
break;
881
940
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
941
fprintf_plus(stderr, "Unknown error while reading data from"
942
" encrypted session with Mandos server\n");
884
943
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
944
errno = EIO;
886
945
goto mandos_end;
891
950
}
892
951
893
952
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
953
fprintf_plus(stderr, "Closing TLS session\n");
895
954
}
896
955
897
956
if(quit_now){
909
968
910
969
if(buffer_length > 0){
911
970
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
915
973
if(decrypted_buffer_size >= 0){
916
974
917
975
written = 0;
927
985
if(ret == 0 and ferror(stdout)){
928
986
int e = errno;
929
987
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
988
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
989
strerror(errno));
932
990
}
933
991
errno = e;
934
992
goto mandos_end;
978
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1038
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
983
1043
984
1044
/* Called whenever a service has been resolved successfully or
985
1045
timed out */
991
1051
switch(event){
992
1052
default:
993
1053
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
997
1059
break;
998
1060
999
1061
case AVAHI_RESOLVER_FOUND:
1001
1063
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1064
avahi_address_snprint(ip, sizeof(ip), address);
1003
1065
if(debug){
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);
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);
1007
1069
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1010
1074
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1075
avahi_simple_poll_quit(simple_poll);
1012
1076
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
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
}
1015
1083
}
1016
1084
}
1017
1085
}
1027
1095
const char *domain,
1028
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1097
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1032
1102
1033
1103
/* Called whenever a new services becomes available on the LAN or
1034
1104
is removed from the LAN */
1041
1111
default:
1042
1112
case AVAHI_BROWSER_FAILURE:
1043
1113
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
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);
1047
1118
return;
1048
1119
1049
1120
case AVAHI_BROWSER_NEW:
1052
1123
the callback function is called the Avahi server will free the
1053
1124
resolver for us. */
1054
1125
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)));
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)));
1060
1134
break;
1061
1135
1062
1136
case AVAHI_BROWSER_REMOVE:
1065
1139
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1140
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1141
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1142
fprintf_plus(stderr, "No Mandos server found, still"
1143
" searching...\n");
1069
1144
}
1070
1145
break;
1071
1146
}
1080
1155
signal_received = sig;
1081
1156
int old_errno = errno;
1082
1157
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1085
1160
}
1086
1161
errno = old_errno;
1087
1162
}
1088
1163
1089
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1165
int ret;
1166
error_t ret_errno;
1091
1167
1092
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1169
if(s < 0){
1170
ret_errno = errno;
1094
1171
perror_plus("socket");
1172
errno = ret_errno;
1095
1173
return false;
1096
1174
}
1097
1175
strcpy(ifr->ifr_name, ifname);
1098
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1177
if(ret == -1){
1100
1178
if(debug){
1179
ret_errno = errno;
1101
1180
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1102
1182
}
1103
1183
return false;
1104
1184
}
1110
1190
/* Reject the loopback device */
1111
1191
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1192
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1193
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1194
ifname);
1115
1195
}
1116
1196
return false;
1117
1197
}
1118
1198
/* Accept point-to-point devices only if connect_to is specified */
1119
1199
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1200
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1201
fprintf_plus(stderr, "Accepting point-to-point interface"
1202
" \"%s\"\n", ifname);
1123
1203
}
1124
1204
return true;
1125
1205
}
1126
1206
/* Otherwise, reject non-broadcast-capable devices */
1127
1207
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1208
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1209
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1210
" \"%s\"\n", ifname);
1131
1211
}
1132
1212
return false;
1133
1213
}
1134
1214
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1215
if(ifr->ifr_flags & IFF_NOARP){
1136
1216
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1217
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1218
ifname);
1138
1219
}
1139
1220
return false;
1140
1221
}
1141
1222
1142
1223
/* Accept this device */
1143
1224
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1225
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1226
}
1146
1227
return true;
1147
1228
}
1159
1240
struct ifreq ifr;
1160
1241
if(not get_flags(if_entry->d_name, &ifr)){
1161
1242
if(debug){
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;
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);
1215
1285
}
1216
1286
1217
1287
int notdotentries(const struct dirent *direntry){
1228
1298
/* Is this directory entry a runnable program? */
1229
1299
int runnable_hook(const struct dirent *direntry){
1230
1300
int ret;
1301
size_t sret;
1231
1302
struct stat st;
1232
1303
1233
1304
if((direntry->d_name)[0] == '\0'){
1235
1306
return 0;
1236
1307
}
1237
1308
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);
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);
1255
1330
if(ret == -1){
1256
1331
if(debug){
1257
perror_plus("Could not stat plugin");
1332
perror_plus("Could not stat hook");
1258
1333
}
1259
1334
return 0;
1260
1335
}
1261
1336
if(not (S_ISREG(st.st_mode))){
1262
1337
/* Not a regular file */
1338
if(debug){
1339
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1340
direntry->d_name);
1341
}
1263
1342
return 0;
1264
1343
}
1265
1344
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
1345
/* Not executable */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1348
direntry->d_name);
1349
}
1267
1350
return 0;
1268
1351
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1269
1356
return 1;
1270
1357
}
1271
1358
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1273
1361
int ret;
1274
1362
struct timespec now;
1275
1363
struct timespec waited_time;
1276
1364
intmax_t block_time;
1277
1365
1278
1366
while(true){
1279
if(mc.current_server == NULL){
1367
if(mc->current_server == NULL){
1280
1368
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1369
fprintf_plus(stderr, "Wait until first server is found."
1370
" No timeout!\n");
1283
1371
}
1284
1372
ret = avahi_simple_poll_iterate(s, -1);
1285
1373
} else {
1286
1374
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1375
fprintf_plus(stderr, "Check current_server if we should run"
1376
" it, or wait\n");
1289
1377
}
1290
1378
/* the current time */
1291
1379
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1296
1384
/* Calculating in ms how long time between now and server
1297
1385
who we visted longest time ago. Now - last seen. */
1298
1386
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1387
- mc->current_server->last_seen.tv_sec);
1300
1388
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1389
- mc->current_server->last_seen.tv_nsec);
1302
1390
/* total time is 10s/10,000ms.
1303
1391
Converting to s from ms by dividing by 1,000,
1304
1392
and ns to ms by dividing by 1,000,000. */
1307
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1396
1309
1397
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
block_time);
1311
1400
}
1312
1401
1313
1402
if(block_time <= 0){
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);
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);
1318
1407
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1408
avahi_simple_poll_quit(s);
1320
1409
return 0;
1321
1410
}
1322
1411
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1412
&mc->current_server->last_seen);
1324
1413
if(ret == -1){
1325
1414
perror_plus("clock_gettime");
1326
1415
return -1;
1327
1416
}
1328
mc.current_server = mc.current_server->next;
1417
mc->current_server = mc->current_server->next;
1329
1418
block_time = 0; /* Call avahi to find new Mandos
1330
1419
servers, but don't block */
1331
1420
}
1333
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
1423
}
1335
1424
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1425
if (ret > 0 or errno != EINTR){
1337
1426
return (ret != 1) ? ret : 0;
1338
1427
}
1339
1428
}
1340
1429
}
1341
1430
}
1342
1431
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
1343
1789
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 };
1344
1794
AvahiSServiceBrowser *sb = NULL;
1345
int error;
1795
error_t ret_errno;
1346
1796
int ret;
1347
1797
intmax_t tmpmax;
1348
1798
char *tmp;
1349
1799
int exitcode = EXIT_SUCCESS;
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;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1356
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1357
1803
bool tempdir_created = false;
1358
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
1805
const char *seckey = PATHDIR "/" SECKEY;
1360
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1361
1809
1362
1810
bool gnutls_initialized = false;
1363
1811
bool gpgme_initialized = false;
1425
1873
.group = 2 },
1426
1874
{ .name = "retry", .key = 132,
1427
1875
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
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",
1429
1881
.group = 2 },
1430
1882
/*
1431
1883
* These reproduce what we would get without ARGP_NO_HELP
1450
1902
connect_to = arg;
1451
1903
break;
1452
1904
case 'i': /* --interface */
1453
interface = arg;
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
}
1454
1910
break;
1455
1911
case 's': /* --seckey */
1456
1912
seckey = arg;
1485
1941
argp_error(state, "Bad retry interval");
1486
1942
}
1487
1943
break;
1944
case 133: /* --network-hook-dir */
1945
hookdir = arg;
1946
break;
1488
1947
/*
1489
1948
* These reproduce what we would get without ARGP_NO_HELP
1490
1949
*/
1496
1955
argp_state_help(state, state->out_stream,
1497
1956
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
1957
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1500
1959
exit(argp_err_exit_status);
1501
1960
break;
1502
1961
default:
1529
1988
{
1530
1989
/* Work around Debian bug #633582:
1531
1990
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1991
1534
1992
/* Re-raise priviliges */
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
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
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");
1644
2066
goto end;
1645
2067
}
1646
}
1647
close(devnull);
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
}
1648
2077
}
1649
2078
1650
2079
if(not debug){
1651
2080
avahi_set_log_function(empty_log);
1652
2081
}
1653
2082
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
1674
exitcode = EXIT_FAILURE;
1675
goto end;
1676
}
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
1686
2083
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
2084
from the signal handler */
1688
2085
/* Initialize the pseudo-RNG for Avahi */
1689
2086
srand((unsigned int) time(NULL));
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
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");
1693
2091
exitcode = EX_UNAVAILABLE;
1694
2092
goto end;
1695
2093
}
1757
2155
}
1758
2156
}
1759
2157
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
if(if_index == 0){
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
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;
1845
2204
}
1846
2205
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
2206
break;
1865
2207
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
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);
1903
2233
}
1904
2234
1905
2235
if(quit_now){
1906
2236
goto end;
1907
2237
}
1908
2238
1909
ret = init_gnutls_global(pubkey, seckey);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
1910
2240
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
1912
2242
exitcode = EX_UNAVAILABLE;
1913
2243
goto end;
1914
2244
} else {
1929
2259
goto end;
1930
2260
}
1931
2261
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2263
fprintf_plus(stderr, "init_gpgme failed\n");
1934
2264
exitcode = EX_UNAVAILABLE;
1935
2265
goto end;
1936
2266
} else {
1945
2275
/* Connect directly, do not use Zeroconf */
1946
2276
/* (Mainly meant for debugging) */
1947
2277
char *address = strrchr(connect_to, ':');
2278
1948
2279
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
2280
fprintf_plus(stderr, "No colon in address\n");
1950
2281
exitcode = EX_USAGE;
1951
2282
goto end;
1952
2283
}
1955
2286
goto end;
1956
2287
}
1957
2288
1958
uint16_t port;
2289
in_port_t port;
1959
2290
errno = 0;
1960
2291
tmpmax = strtoimax(address+1, &tmp, 10);
1961
2292
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
2293
or tmpmax != (in_port_t)tmpmax){
2294
fprintf_plus(stderr, "Bad port number\n");
1964
2295
exitcode = EX_USAGE;
1965
2296
goto end;
1966
2297
}
1967
2298
1968
2299
if(quit_now){
1969
2300
goto end;
1970
2301
}
1971
2302
1972
port = (uint16_t)tmpmax;
2303
port = (in_port_t)tmpmax;
1973
2304
*address = '\0';
1974
2305
/* Colon in address indicates IPv6 */
1975
2306
int af;
1991
2322
}
1992
2323
1993
2324
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
1995
2327
if(quit_now or ret == 0){
1996
2328
break;
1997
2329
}
1998
2330
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
(int)retry_interval);
2001
2333
}
2002
2334
sleep((int)retry_interval);
2003
2335
}
2023
2355
config.publish_domain = 0;
2024
2356
2025
2357
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2029
2360
2030
2361
/* Free the Avahi configuration data */
2031
2362
avahi_server_config_free(&config);
2033
2364
2034
2365
/* Check if creating the Avahi server object succeeded */
2035
2366
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2038
2369
exitcode = EX_UNAVAILABLE;
2039
2370
goto end;
2040
2371
}
2046
2377
/* Create the Avahi service browser */
2047
2378
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
2379
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2050
2382
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
avahi_strerror(avahi_server_errno(mc.server)));
2053
2385
exitcode = EX_UNAVAILABLE;
2054
2386
goto end;
2055
2387
}
2061
2393
/* Run the main loop */
2062
2394
2063
2395
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2065
2397
}
2066
2398
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2069
2401
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
(ret == 0) ? "successfully" : "with error");
2072
2404
}
2073
2405
2074
2406
end:
2075
2407
2076
2408
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2078
2410
}
2079
2411
2080
2412
/* Cleanup things */
2413
free(mc.interfaces);
2414
2081
2415
if(sb != NULL)
2082
2416
avahi_s_service_browser_free(sb);
2083
2417
2084
2418
if(mc.server != NULL)
2085
2419
avahi_server_free(mc.server);
2086
2420
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2089
2423
2090
2424
if(gnutls_initialized){
2091
2425
gnutls_certificate_free_credentials(mc.cred);
2096
2430
if(gpgme_initialized){
2097
2431
gpgme_release(mc.ctx);
2098
2432
}
2099
2433
2100
2434
/* Cleans up the circular linked list of Mandos servers the client
2101
2435
has seen */
2102
2436
if(mc.current_server != NULL){
2108
2442
}
2109
2443
}
2110
2444
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2120
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
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");
2130
2463
}
2131
2464
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2141
2468
}
2142
2469
}
2470
2471
lower_privileges_permanently();
2143
2472
}
2144
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2476
2145
2477
/* Removes the GPGME temp directory and all files inside */
2146
2478
if(tempdir_created){
2147
2479
struct dirent **direntries = NULL;
2160
2492
}
2161
2493
ret = remove(fullname);
2162
2494
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2165
2497
}
2166
2498
free(fullname);
2167
2499
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0