To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 641
- compare with another revision
- download diff
- download tarball
- view history from revision 641
- Committer: Teddy Hogeborn
- Date: 2013-10-28 10:04:05 UTC
- Revision ID: teddy@recompile.se-20131028100405-u6miovq7y39m69x7
Doc fix: Refer to architecture libdir.
* debian/mandos-client.README.Debian: Refer to architecture libdir.
* debian/mandos-client.README.Debian: Refer to architecture libdir.
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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() */
90
94
91
95
#ifdef __linux__
92
96
#include <sys/klog.h> /* klogctl() */
134
138
static const char sys_class_net[] = "/sys/class/net";
135
139
char *connect_to = NULL;
136
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
137
143
138
144
/* Doubly linked list that need to be circularly linked when used */
139
145
typedef struct server{
140
146
const char *ip;
141
uint16_t port;
147
in_port_t port;
142
148
AvahiIfIndex if_index;
143
149
int af;
144
150
struct timespec last_seen;
148
154
149
155
/* Used for passing in values through the Avahi callback functions */
150
156
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
157
AvahiServer *server;
153
158
gnutls_certificate_credentials_t cred;
154
159
unsigned int dh_bits;
156
161
const char *priority;
157
162
gpgme_ctx_t ctx;
158
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
159
166
} mandos_context;
160
167
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
166
170
167
171
sig_atomic_t quit_now = 0;
168
172
int signal_received = 0;
169
173
170
174
/* Function to use when printing errors */
171
175
void perror_plus(const char *print_text){
176
int e = errno;
172
177
fprintf(stderr, "Mandos plugin %s: ",
173
178
program_invocation_short_name);
179
errno = e;
174
180
perror(print_text);
175
181
}
176
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 (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
177
193
/*
178
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
195
* bytes. "buffer_capacity" is how much is currently allocated,
192
208
}
193
209
194
210
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
197
213
int ret;
198
214
server *new_server = malloc(sizeof(server));
199
215
if(new_server == NULL){
200
216
perror_plus("malloc");
201
return -1;
217
return false;
202
218
}
203
219
*new_server = (server){ .ip = strdup(ip),
204
220
.port = port,
206
222
.af = af };
207
223
if(new_server->ip == NULL){
208
224
perror_plus("strdup");
209
return -1;
225
return false;
210
226
}
211
227
/* Special case of first server */
212
if (mc.current_server == NULL){
228
if(*current_server == NULL){
213
229
new_server->next = new_server;
214
230
new_server->prev = new_server;
215
mc.current_server = new_server;
231
*current_server = new_server;
216
232
/* Place the new server last in the list */
217
233
} else {
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
220
236
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
222
238
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
224
240
if(ret == -1){
225
241
perror_plus("clock_gettime");
226
return -1;
242
return false;
227
243
}
228
return 0;
244
return true;
229
245
}
230
246
231
247
/*
232
248
* Initialize GPGME.
233
249
*/
234
250
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
251
const char *tempdir, mandos_context *mc){
236
252
gpgme_error_t rc;
237
253
gpgme_engine_info_t engine_info;
238
254
239
240
255
/*
241
256
* Helper function to insert pub and seckey to the engine keyring.
242
257
*/
253
268
254
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
270
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
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));
259
273
return false;
260
274
}
261
275
262
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
263
277
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
267
280
return false;
268
281
}
269
282
276
289
}
277
290
278
291
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
281
293
}
282
294
283
295
/* Init GPGME */
284
296
gpgme_check_version(NULL);
285
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
298
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
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));
290
301
return false;
291
302
}
292
303
293
304
/* Set GPGME home directory for the OpenPGP engine only */
294
305
rc = gpgme_get_engine_info(&engine_info);
295
306
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
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));
299
309
return false;
300
310
}
301
311
while(engine_info != NULL){
307
317
engine_info = engine_info->next;
308
318
}
309
319
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"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);
312
322
return false;
313
323
}
314
324
315
325
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
317
327
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
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));
321
331
return false;
322
332
}
323
333
334
344
*/
335
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
346
size_t crypto_size,
337
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
338
349
gpgme_data_t dh_crypto, dh_plain;
339
350
gpgme_error_t rc;
340
351
ssize_t ret;
342
353
ssize_t plaintext_length = 0;
343
354
344
355
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
357
}
348
358
349
359
/* Create new GPGME data buffer from memory cryptotext */
350
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
361
0);
352
362
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
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));
356
365
return -1;
357
366
}
358
367
359
368
/* Create new empty GPGME data buffer for the plaintext */
360
369
rc = gpgme_data_new(&dh_plain);
361
370
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
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));
365
374
gpgme_data_release(dh_crypto);
366
375
return -1;
367
376
}
368
377
369
378
/* Decrypt data from the cryptotext data buffer to the plaintext
370
379
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
381
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
376
384
plaintext_length = -1;
377
385
if(debug){
378
386
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
380
388
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
390
} else {
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
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);
390
395
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
397
}
394
398
gpgme_recipient_t recipient;
395
399
recipient = result->recipients;
396
400
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "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");
406
408
recipient = recipient->next;
407
409
}
408
410
}
411
413
}
412
414
413
415
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
417
}
417
418
418
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
450
}
450
451
451
452
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
454
454
for(ssize_t i = 0; i < plaintext_length; i++){
455
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
456
}
468
468
}
469
469
470
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
473
472
if(ret == NULL)
474
473
ret = "(unknown)";
475
474
return ret;
478
477
/* GnuTLS log function callback */
479
478
static void debuggnutls(__attribute__((unused)) int level,
480
479
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
482
481
}
483
482
484
483
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
486
486
int ret;
487
487
488
488
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
490
}
492
491
493
492
ret = gnutls_global_init();
494
493
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
497
496
return -1;
498
497
}
499
498
506
505
}
507
506
508
507
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
509
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
513
512
gnutls_global_deinit();
514
513
return -1;
515
514
}
516
515
517
516
if(debug){
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
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);
522
521
}
523
522
524
523
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
526
525
GNUTLS_OPENPGP_FMT_BASE64);
527
526
if(ret != GNUTLS_E_SUCCESS){
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", 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));
534
532
goto globalfail;
535
533
}
536
534
537
535
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
539
537
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
543
541
goto globalfail;
544
542
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
544
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
550
547
goto globalfail;
551
548
}
552
549
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
551
555
552
return 0;
556
553
557
554
globalfail:
558
555
559
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
560
557
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
562
559
return -1;
563
560
}
564
561
565
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
566
564
int ret;
567
565
/* GnuTLS session creation */
568
566
do {
572
570
}
573
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
572
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
578
576
}
579
577
580
578
{
581
579
const char *err;
582
580
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
582
if(quit_now){
585
583
gnutls_deinit(*session);
586
584
return -1;
587
585
}
588
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
587
if(ret != GNUTLS_E_SUCCESS){
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", 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));
594
591
gnutls_deinit(*session);
595
592
return -1;
596
593
}
598
595
599
596
do {
600
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
598
mc->cred);
602
599
if(quit_now){
603
600
gnutls_deinit(*session);
604
601
return -1;
605
602
}
606
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
604
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
611
607
gnutls_deinit(*session);
612
608
return -1;
613
609
}
615
611
/* ignore client certificate if any. */
616
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
613
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
615
620
616
return 0;
621
617
}
625
621
__attribute__((unused)) const char *txt){}
626
622
627
623
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
629
625
AvahiIfIndex if_index,
630
int af){
626
int af, mandos_context *mc){
631
627
int ret, tcp_sd = -1;
632
628
ssize_t sret;
633
629
union {
658
654
pf = PF_INET;
659
655
break;
660
656
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
658
errno = EINVAL;
664
659
return -1;
665
660
}
666
661
667
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);
668
695
if(ret != 0){
669
696
return -1;
670
697
}
671
698
672
699
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
676
702
}
677
703
678
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
704
730
}
705
731
if(ret == 0){
706
732
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
734
errno = e;
710
735
goto mandos_end;
711
736
}
712
737
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
738
to.in6.sin6_port = htons(port);
717
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
741
-Wunreachable-code*/
720
742
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
743
fprintf_plus(stderr, "An IPv6 link-local address is"
744
" incomplete without a network interface\n");
724
745
errno = EINVAL;
725
746
goto mandos_end;
726
747
}
744
765
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
766
perror_plus("if_indextoname");
746
767
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
750
770
}
751
771
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
754
774
}
755
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
766
786
perror_plus("inet_ntop");
767
787
} else {
768
788
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
771
790
}
772
791
}
773
792
}
827
846
}
828
847
829
848
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
849
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
850
}
833
851
834
852
if(quit_now){
836
854
goto mandos_end;
837
855
}
838
856
839
/* Spurious warning from -Wint-to-pointer-cast */
840
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);
841
862
842
863
if(quit_now){
843
864
errno = EINTR;
854
875
855
876
if(ret != GNUTLS_E_SUCCESS){
856
877
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
878
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
879
gnutls_perror(ret);
860
880
}
861
881
errno = EPROTO;
865
885
/* Read OpenPGP packet that contains the wanted password */
866
886
867
887
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
888
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
889
" %s\n", ip);
870
890
}
871
891
872
892
while(true){
910
930
}
911
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
932
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
933
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
934
"***\n");
915
935
gnutls_perror(ret);
916
936
errno = EPROTO;
917
937
goto mandos_end;
918
938
}
919
939
break;
920
940
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
941
fprintf_plus(stderr, "Unknown error while reading data from"
942
" encrypted session with Mandos server\n");
924
943
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
944
errno = EIO;
926
945
goto mandos_end;
931
950
}
932
951
933
952
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
953
fprintf_plus(stderr, "Closing TLS session\n");
936
954
}
937
955
938
956
if(quit_now){
951
969
if(buffer_length > 0){
952
970
ssize_t decrypted_buffer_size;
953
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
972
&decrypted_buffer, mc);
955
973
if(decrypted_buffer_size >= 0){
956
974
957
975
written = 0;
967
985
if(ret == 0 and ferror(stdout)){
968
986
int e = errno;
969
987
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
988
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
989
strerror(errno));
973
990
}
974
991
errno = e;
975
992
goto mandos_end;
1019
1036
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1037
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1038
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1024
1043
1025
1044
/* Called whenever a service has been resolved successfully or
1026
1045
timed out */
1032
1051
switch(event){
1033
1052
default:
1034
1053
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
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)));
1039
1059
break;
1040
1060
1041
1061
case AVAHI_RESOLVER_FOUND:
1043
1063
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1064
avahi_address_snprint(ip, sizeof(ip), address);
1045
1065
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
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);
1050
1069
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
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);
1053
1074
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1075
avahi_simple_poll_quit(simple_poll);
1055
1076
} else {
1056
ret = add_server(ip, port, interface,
1057
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
}
1058
1083
}
1059
1084
}
1060
1085
}
1070
1095
const char *domain,
1071
1096
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1097
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1075
1102
1076
1103
/* Called whenever a new services becomes available on the LAN or
1077
1104
is removed from the LAN */
1084
1111
default:
1085
1112
case AVAHI_BROWSER_FAILURE:
1086
1113
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
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);
1091
1118
return;
1092
1119
1093
1120
case AVAHI_BROWSER_NEW:
1096
1123
the callback function is called the Avahi server will free the
1097
1124
resolver for us. */
1098
1125
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
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)));
1105
1134
break;
1106
1135
1107
1136
case AVAHI_BROWSER_REMOVE:
1110
1139
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1140
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1141
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1142
fprintf_plus(stderr, "No Mandos server found, still"
1143
" searching...\n");
1115
1144
}
1116
1145
break;
1117
1146
}
1126
1155
signal_received = sig;
1127
1156
int old_errno = errno;
1128
1157
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1131
1160
}
1132
1161
errno = old_errno;
1133
1162
}
1134
1163
1135
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1165
int ret;
1166
error_t ret_errno;
1137
1167
1138
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1169
if(s < 0){
1170
ret_errno = errno;
1140
1171
perror_plus("socket");
1172
errno = ret_errno;
1141
1173
return false;
1142
1174
}
1143
1175
strcpy(ifr->ifr_name, ifname);
1144
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1177
if(ret == -1){
1146
1178
if(debug){
1179
ret_errno = errno;
1147
1180
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1148
1182
}
1149
1183
return false;
1150
1184
}
1156
1190
/* Reject the loopback device */
1157
1191
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1192
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1193
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1194
ifname);
1161
1195
}
1162
1196
return false;
1163
1197
}
1164
1198
/* Accept point-to-point devices only if connect_to is specified */
1165
1199
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1200
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1201
fprintf_plus(stderr, "Accepting point-to-point interface"
1202
" \"%s\"\n", ifname);
1169
1203
}
1170
1204
return true;
1171
1205
}
1172
1206
/* Otherwise, reject non-broadcast-capable devices */
1173
1207
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1208
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1209
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1210
" \"%s\"\n", ifname);
1177
1211
}
1178
1212
return false;
1179
1213
}
1180
1214
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1215
if(ifr->ifr_flags & IFF_NOARP){
1182
1216
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1217
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1218
ifname);
1185
1219
}
1186
1220
return false;
1187
1221
}
1188
1222
1189
1223
/* Accept this device */
1190
1224
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1225
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1226
}
1194
1227
return true;
1195
1228
}
1207
1240
struct ifreq ifr;
1208
1241
if(not get_flags(if_entry->d_name, &ifr)){
1209
1242
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
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);
1267
1285
}
1268
1286
1269
1287
int notdotentries(const struct dirent *direntry){
1295
1313
if((direntry->d_name)[sret] != '\0'){
1296
1314
/* Contains non-allowed characters */
1297
1315
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1316
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1317
direntry->d_name);
1301
1318
}
1302
1319
return 0;
1303
1320
}
1319
1336
if(not (S_ISREG(st.st_mode))){
1320
1337
/* Not a regular file */
1321
1338
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1339
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1340
direntry->d_name);
1325
1341
}
1326
1342
return 0;
1327
1343
}
1328
1344
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1345
/* Not executable */
1330
1346
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1348
direntry->d_name);
1334
1349
}
1335
1350
return 0;
1336
1351
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1337
1356
return 1;
1338
1357
}
1339
1358
1340
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){
1341
1361
int ret;
1342
1362
struct timespec now;
1343
1363
struct timespec waited_time;
1344
1364
intmax_t block_time;
1345
1365
1346
1366
while(true){
1347
if(mc.current_server == NULL){
1367
if(mc->current_server == NULL){
1348
1368
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1369
fprintf_plus(stderr, "Wait until first server is found."
1370
" No timeout!\n");
1351
1371
}
1352
1372
ret = avahi_simple_poll_iterate(s, -1);
1353
1373
} else {
1354
1374
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1375
fprintf_plus(stderr, "Check current_server if we should run"
1376
" it, or wait\n");
1358
1377
}
1359
1378
/* the current time */
1360
1379
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1384
/* Calculating in ms how long time between now and server
1366
1385
who we visted longest time ago. Now - last seen. */
1367
1386
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1387
- mc->current_server->last_seen.tv_sec);
1369
1388
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1389
- mc->current_server->last_seen.tv_nsec);
1371
1390
/* total time is 10s/10,000ms.
1372
1391
Converting to s from ms by dividing by 1,000,
1373
1392
and ns to ms by dividing by 1,000,000. */
1376
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1396
1378
1397
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
block_time);
1381
1400
}
1382
1401
1383
1402
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
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);
1388
1407
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1408
avahi_simple_poll_quit(s);
1390
1409
return 0;
1391
1410
}
1392
1411
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1412
&mc->current_server->last_seen);
1394
1413
if(ret == -1){
1395
1414
perror_plus("clock_gettime");
1396
1415
return -1;
1397
1416
}
1398
mc.current_server = mc.current_server->next;
1417
mc->current_server = mc->current_server->next;
1399
1418
block_time = 0; /* Call avahi to find new Mandos
1400
1419
servers, but don't block */
1401
1420
}
1410
1429
}
1411
1430
}
1412
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
1413
1484
bool run_network_hooks(const char *mode, const char *interface,
1414
1485
const float delay){
1415
1486
struct dirent **direntries;
1418
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1419
1490
alphasort);
1420
1491
if(numhooks == -1){
1421
perror_plus("scandir");
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
}
1422
1500
} else {
1423
1501
int devnull = open("/dev/null", O_RDONLY);
1424
1502
for(int i = 0; i < numhooks; i++){
1425
direntry = direntries[0];
1503
direntry = direntries[i];
1426
1504
char *fullname = NULL;
1427
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1428
1506
if(ret < 0){
1429
1507
perror_plus("asprintf");
1430
1508
continue;
1431
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1432
1514
pid_t hook_pid = fork();
1433
1515
if(hook_pid == 0){
1434
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
}
1435
1531
dup2(devnull, STDIN_FILENO);
1436
1532
close(devnull);
1437
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1438
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
1535
if(ret == -1){
1440
1536
perror_plus("setenv");
1441
return false;
1537
_exit(EX_OSERR);
1442
1538
}
1443
1539
ret = setenv("DEVICE", interface, 1);
1444
1540
if(ret == -1){
1445
1541
perror_plus("setenv");
1446
return false;
1542
_exit(EX_OSERR);
1447
1543
}
1448
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1449
1545
if(ret == -1){
1450
1546
perror_plus("setenv");
1451
return false;
1547
_exit(EX_OSERR);
1452
1548
}
1453
1549
ret = setenv("MODE", mode, 1);
1454
1550
if(ret == -1){
1455
1551
perror_plus("setenv");
1456
return false;
1552
_exit(EX_OSERR);
1457
1553
}
1458
1554
char *delaystring;
1459
1555
ret = asprintf(&delaystring, "%f", delay);
1460
1556
if(ret == -1){
1461
1557
perror_plus("asprintf");
1462
return false;
1558
_exit(EX_OSERR);
1463
1559
}
1464
1560
ret = setenv("DELAY", delaystring, 1);
1465
1561
if(ret == -1){
1466
1562
free(delaystring);
1467
1563
perror_plus("setenv");
1468
return false;
1564
_exit(EX_OSERR);
1469
1565
}
1470
1566
free(delaystring);
1471
ret = execl(fullname, direntry->d_name, mode, NULL);
1472
perror_plus("execl");
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
}
1473
1578
} else {
1474
1579
int status;
1475
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1479
1584
}
1480
1585
if(WIFEXITED(status)){
1481
1586
if(WEXITSTATUS(status) != 0){
1482
fprintf(stderr, "Mandos plugin mandos-client: "
1483
"Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1486
1590
free(fullname);
1487
1591
continue;
1488
1592
}
1489
1593
} else if(WIFSIGNALED(status)){
1490
fprintf(stderr, "Mandos plugin mandos-client: "
1491
"Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1494
1597
free(fullname);
1495
1598
continue;
1496
1599
} else {
1497
fprintf(stderr, "Mandos plugin mandos-client: "
1498
"Warning: network hook \"%s\" crashed\n",
1499
direntry->d_name);
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1500
1602
free(fullname);
1501
1603
continue;
1502
1604
}
1503
1605
}
1504
1606
free(fullname);
1505
if(quit_now){
1506
break;
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1507
1610
}
1508
1611
}
1509
1612
close(devnull);
1511
1614
return true;
1512
1615
}
1513
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
1514
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 };
1515
1794
AvahiSServiceBrowser *sb = NULL;
1516
int error;
1795
error_t ret_errno;
1517
1796
int ret;
1518
1797
intmax_t tmpmax;
1519
1798
char *tmp;
1520
1799
int exitcode = EXIT_SUCCESS;
1521
const char *interface = "";
1522
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
1525
uid_t uid;
1526
gid_t gid;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1527
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1528
1803
bool tempdir_created = false;
1529
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
1805
const char *seckey = PATHDIR "/" SECKEY;
1531
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1532
1809
1533
1810
bool gnutls_initialized = false;
1534
1811
bool gpgme_initialized = false;
1596
1873
.group = 2 },
1597
1874
{ .name = "retry", .key = 132,
1598
1875
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1876
.doc = "Retry interval used when denied by the Mandos server",
1600
1877
.group = 2 },
1601
1878
{ .name = "network-hook-dir", .key = 133,
1602
1879
.arg = "DIR",
1625
1902
connect_to = arg;
1626
1903
break;
1627
1904
case 'i': /* --interface */
1628
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
}
1629
1910
break;
1630
1911
case 's': /* --seckey */
1631
1912
seckey = arg;
1674
1955
argp_state_help(state, state->out_stream,
1675
1956
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
1957
case 'V': /* --version */
1677
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1678
fprintf(state->out_stream, "%s\n", argp_program_version);
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
1959
exit(argp_err_exit_status);
1680
1960
break;
1681
1961
default:
1708
1988
{
1709
1989
/* Work around Debian bug #633582:
1710
1990
<http://bugs.debian.org/633582> */
1711
struct stat st;
1712
1991
1713
1992
/* Re-raise priviliges */
1714
errno = 0;
1715
ret = seteuid(0);
1716
if(ret == -1){
1717
perror_plus("seteuid");
1718
}
1719
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1724
} else {
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1726
if(ret == -1){
1727
perror_plus("fstat");
1728
} else {
1729
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1751
if(ret == -1){
1752
perror_plus("fchown");
1753
}
1754
}
1755
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
1760
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
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
}
1765
2057
}
1766
2058
}
1767
2059
1768
2060
/* Run network hooks */
1769
2061
{
1770
/* Re-raise priviliges */
1771
errno = 0;
1772
ret = seteuid(0);
1773
if(ret == -1){
1774
perror_plus("seteuid");
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
2066
goto end;
2067
}
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)',');
1775
2072
}
1776
if(not run_network_hooks("start", interface, delay)){
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
1777
2075
goto end;
1778
2076
}
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
2077
}
1786
2078
1787
2079
if(not debug){
1788
2080
avahi_set_log_function(empty_log);
1789
2081
}
1790
2082
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf(stderr, "Mandos plugin mandos-client: "
1807
"Using interface \"%s\"\n", interface);
1808
}
1809
if(interface == NULL){
1810
perror_plus("malloc");
1811
free(direntries);
1812
exitcode = EXIT_FAILURE;
1813
goto end;
1814
}
1815
free(direntries);
1816
} else {
1817
free(direntries);
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Could not find a network interface\n");
1820
exitcode = EXIT_FAILURE;
1821
goto end;
1822
}
1823
}
1824
1825
2083
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1826
2084
from the signal handler */
1827
2085
/* Initialize the pseudo-RNG for Avahi */
1828
2086
srand((unsigned int) time(NULL));
1829
mc.simple_poll = avahi_simple_poll_new();
1830
if(mc.simple_poll == NULL){
1831
fprintf(stderr, "Mandos plugin mandos-client: "
1832
"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");
1833
2091
exitcode = EX_UNAVAILABLE;
1834
2092
goto end;
1835
2093
}
1897
2155
}
1898
2156
}
1899
2157
1900
/* If the interface is down, bring it up */
1901
if(strcmp(interface, "none") != 0){
1902
if_index = (AvahiIfIndex) if_nametoindex(interface);
1903
if(if_index == 0){
1904
fprintf(stderr, "Mandos plugin mandos-client: "
1905
"No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
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;
1986
2204
}
1987
2205
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2206
break;
2006
2207
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
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);
2036
2233
}
2037
2234
2038
2235
if(quit_now){
2039
2236
goto end;
2040
2237
}
2041
2238
2042
ret = init_gnutls_global(pubkey, seckey);
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2043
2240
if(ret == -1){
2044
fprintf(stderr, "Mandos plugin mandos-client: "
2045
"init_gnutls_global failed\n");
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2046
2242
exitcode = EX_UNAVAILABLE;
2047
2243
goto end;
2048
2244
} else {
2063
2259
goto end;
2064
2260
}
2065
2261
2066
if(not init_gpgme(pubkey, seckey, tempdir)){
2067
fprintf(stderr, "Mandos plugin mandos-client: "
2068
"init_gpgme failed\n");
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2263
fprintf_plus(stderr, "init_gpgme failed\n");
2069
2264
exitcode = EX_UNAVAILABLE;
2070
2265
goto end;
2071
2266
} else {
2080
2275
/* Connect directly, do not use Zeroconf */
2081
2276
/* (Mainly meant for debugging) */
2082
2277
char *address = strrchr(connect_to, ':');
2278
2083
2279
if(address == NULL){
2084
fprintf(stderr, "Mandos plugin mandos-client: "
2085
"No colon in address\n");
2280
fprintf_plus(stderr, "No colon in address\n");
2086
2281
exitcode = EX_USAGE;
2087
2282
goto end;
2088
2283
}
2091
2286
goto end;
2092
2287
}
2093
2288
2094
uint16_t port;
2289
in_port_t port;
2095
2290
errno = 0;
2096
2291
tmpmax = strtoimax(address+1, &tmp, 10);
2097
2292
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2098
or tmpmax != (uint16_t)tmpmax){
2099
fprintf(stderr, "Mandos plugin mandos-client: "
2100
"Bad port number\n");
2293
or tmpmax != (in_port_t)tmpmax){
2294
fprintf_plus(stderr, "Bad port number\n");
2101
2295
exitcode = EX_USAGE;
2102
2296
goto end;
2103
2297
}
2104
2298
2105
2299
if(quit_now){
2106
2300
goto end;
2107
2301
}
2108
2302
2109
port = (uint16_t)tmpmax;
2303
port = (in_port_t)tmpmax;
2110
2304
*address = '\0';
2111
2305
/* Colon in address indicates IPv6 */
2112
2306
int af;
2128
2322
}
2129
2323
2130
2324
while(not quit_now){
2131
ret = start_mandos_communication(address, port, if_index, af);
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2132
2327
if(quit_now or ret == 0){
2133
2328
break;
2134
2329
}
2135
2330
if(debug){
2136
fprintf(stderr, "Mandos plugin mandos-client: "
2137
"Retrying in %d seconds\n", (int)retry_interval);
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
(int)retry_interval);
2138
2333
}
2139
sleep((int)retry_interval);
2334
sleep((unsigned int)retry_interval);
2140
2335
}
2141
2336
2142
2337
if (not quit_now){
2160
2355
config.publish_domain = 0;
2161
2356
2162
2357
/* Allocate a new server */
2163
mc.server = avahi_server_new(avahi_simple_poll_get
2164
(mc.simple_poll), &config, NULL,
2165
NULL, &error);
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2166
2360
2167
2361
/* Free the Avahi configuration data */
2168
2362
avahi_server_config_free(&config);
2170
2364
2171
2365
/* Check if creating the Avahi server object succeeded */
2172
2366
if(mc.server == NULL){
2173
fprintf(stderr, "Mandos plugin mandos-client: "
2174
"Failed to create Avahi server: %s\n",
2175
avahi_strerror(error));
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2176
2369
exitcode = EX_UNAVAILABLE;
2177
2370
goto end;
2178
2371
}
2184
2377
/* Create the Avahi service browser */
2185
2378
sb = avahi_s_service_browser_new(mc.server, if_index,
2186
2379
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2187
NULL, 0, browse_callback, NULL);
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2188
2382
if(sb == NULL){
2189
fprintf(stderr, "Mandos plugin mandos-client: "
2190
"Failed to create service browser: %s\n",
2191
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)));
2192
2385
exitcode = EX_UNAVAILABLE;
2193
2386
goto end;
2194
2387
}
2200
2393
/* Run the main loop */
2201
2394
2202
2395
if(debug){
2203
fprintf(stderr, "Mandos plugin mandos-client: "
2204
"Starting Avahi loop search\n");
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2205
2397
}
2206
2398
2207
ret = avahi_loop_with_timeout(mc.simple_poll,
2208
(int)(retry_interval * 1000));
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2209
2401
if(debug){
2210
fprintf(stderr, "Mandos plugin mandos-client: "
2211
"avahi_loop_with_timeout exited %s\n",
2212
(ret == 0) ? "successfully" : "with error");
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
(ret == 0) ? "successfully" : "with error");
2213
2404
}
2214
2405
2215
2406
end:
2216
2407
2217
2408
if(debug){
2218
fprintf(stderr, "Mandos plugin mandos-client: "
2219
"%s exiting\n", argv[0]);
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2220
2410
}
2221
2411
2222
2412
/* Cleanup things */
2413
free(mc.interfaces);
2414
2223
2415
if(sb != NULL)
2224
2416
avahi_s_service_browser_free(sb);
2225
2417
2226
2418
if(mc.server != NULL)
2227
2419
avahi_server_free(mc.server);
2228
2420
2229
if(mc.simple_poll != NULL)
2230
avahi_simple_poll_free(mc.simple_poll);
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2231
2423
2232
2424
if(gnutls_initialized){
2233
2425
gnutls_certificate_free_credentials(mc.cred);
2238
2430
if(gpgme_initialized){
2239
2431
gpgme_release(mc.ctx);
2240
2432
}
2241
2433
2242
2434
/* Cleans up the circular linked list of Mandos servers the client
2243
2435
has seen */
2244
2436
if(mc.current_server != NULL){
2252
2444
2253
2445
/* Re-raise priviliges */
2254
2446
{
2255
errno = 0;
2256
ret = seteuid(0);
2257
if(ret == -1){
2258
perror_plus("seteuid");
2259
}
2447
raise_privileges();
2448
2260
2449
/* Run network hooks */
2261
if(not run_network_hooks("stop", interface, delay)){
2262
goto end;
2263
}
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2264
2452
2265
/* Take down the network interface */
2266
if(take_down_interface and geteuid() == 0){
2267
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2268
if(ret == -1){
2269
perror_plus("ioctl SIOCGIFFLAGS");
2270
} else if(network.ifr_flags & IFF_UP){
2271
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2272
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2273
if(ret == -1){
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
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");
2275
2463
}
2276
2464
}
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2278
if(ret == -1){
2279
perror_plus("close");
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2280
2468
}
2281
2469
}
2282
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2470
2471
lower_privileges_permanently();
2472
}
2473
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2289
2476
2290
2477
/* Removes the GPGME temp directory and all files inside */
2291
2478
if(tempdir_created){
2305
2492
}
2306
2493
ret = remove(fullname);
2307
2494
if(ret == -1){
2308
fprintf(stderr, "Mandos plugin mandos-client: "
2309
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2310
2497
}
2311
2498
free(fullname);
2312
2499
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0