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- Committer: Teddy Hogeborn
- Date: 2012-06-17 02:30:59 UTC
- Revision ID: teddy@recompile.se-20120617023059-em4nfnxg1tsn64xj
* plugins.d/mandos-client (start_mandos_communication): Bug fix; skip
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
non-specified
interfaces.
(main): Use lower_privileges() consistently. Bug fix: Don't remove
"none" from list of interfaces. Make --interface=none work
again by not bringing up interfaces specified after "none".
* plugins.d/mandos-client.xml (OPTIONS): Document new meaning of
specifying --interface=none
together with other
interface names,
- 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
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 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(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
663
/* Check if the interface is one of the interfaces we are using */
664
bool match = false;
665
{
666
char *interface = NULL;
667
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
668
interface))){
669
if(if_nametoindex(interface) == (unsigned int)if_index){
670
match = true;
671
break;
672
}
673
}
674
}
675
if(not match){
676
if(debug){
677
char interface[IF_NAMESIZE];
678
if(if_indextoname((unsigned int)if_index, interface) == NULL){
679
perror_plus("if_indextoname");
680
} else {
681
fprintf_plus(stderr, "Skipping server on non-used interface"
682
" \"%s\"\n",
683
if_indextoname((unsigned int)if_index,
684
interface));
685
}
686
}
687
return -1;
688
}
689
}
690
691
ret = init_gnutls_session(&session, mc);
668
692
if(ret != 0){
669
693
return -1;
670
694
}
671
695
672
696
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
697
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
698
PRIuMAX "\n", ip, (uintmax_t)port);
676
699
}
677
700
678
701
tcp_sd = socket(pf, SOCK_STREAM, 0);
704
727
}
705
728
if(ret == 0){
706
729
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
730
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
731
errno = e;
710
732
goto mandos_end;
711
733
}
712
734
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
735
to.in6.sin6_port = htons(port);
717
736
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
737
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
738
-Wunreachable-code*/
720
739
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");
740
fprintf_plus(stderr, "An IPv6 link-local address is"
741
" incomplete without a network interface\n");
724
742
errno = EINVAL;
725
743
goto mandos_end;
726
744
}
744
762
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
763
perror_plus("if_indextoname");
746
764
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
765
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
766
"\n", ip, interface, (uintmax_t)port);
750
767
}
751
768
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
769
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
770
ip, (uintmax_t)port);
754
771
}
755
772
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
773
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
766
783
perror_plus("inet_ntop");
767
784
} else {
768
785
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
786
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
771
787
}
772
788
}
773
789
}
827
843
}
828
844
829
845
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
846
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
847
}
833
848
834
849
if(quit_now){
836
851
goto mandos_end;
837
852
}
838
853
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
854
/* This casting via intptr_t is to eliminate warning about casting
855
an int to a pointer type. This is exactly how the GnuTLS Guile
856
function "set-session-transport-fd!" does it. */
857
gnutls_transport_set_ptr(session,
858
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
859
842
860
if(quit_now){
843
861
errno = EINTR;
854
872
855
873
if(ret != GNUTLS_E_SUCCESS){
856
874
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
875
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
876
gnutls_perror(ret);
860
877
}
861
878
errno = EPROTO;
865
882
/* Read OpenPGP packet that contains the wanted password */
866
883
867
884
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
885
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
886
" %s\n", ip);
870
887
}
871
888
872
889
while(true){
910
927
}
911
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
929
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
930
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
931
"***\n");
915
932
gnutls_perror(ret);
916
933
errno = EPROTO;
917
934
goto mandos_end;
918
935
}
919
936
break;
920
937
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
938
fprintf_plus(stderr, "Unknown error while reading data from"
939
" encrypted session with Mandos server\n");
924
940
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
941
errno = EIO;
926
942
goto mandos_end;
931
947
}
932
948
933
949
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
950
fprintf_plus(stderr, "Closing TLS session\n");
936
951
}
937
952
938
953
if(quit_now){
951
966
if(buffer_length > 0){
952
967
ssize_t decrypted_buffer_size;
953
968
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
969
&decrypted_buffer, mc);
955
970
if(decrypted_buffer_size >= 0){
956
971
957
972
written = 0;
967
982
if(ret == 0 and ferror(stdout)){
968
983
int e = errno;
969
984
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
985
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
986
strerror(errno));
973
987
}
974
988
errno = e;
975
989
goto mandos_end;
1019
1033
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1034
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1035
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1036
void* mc){
1037
if(r == NULL){
1038
return;
1039
}
1024
1040
1025
1041
/* Called whenever a service has been resolved successfully or
1026
1042
timed out */
1032
1048
switch(event){
1033
1049
default:
1034
1050
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)));
1051
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1052
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1053
domain,
1054
avahi_strerror(avahi_server_errno
1055
(((mandos_context*)mc)->server)));
1039
1056
break;
1040
1057
1041
1058
case AVAHI_RESOLVER_FOUND:
1043
1060
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1061
avahi_address_snprint(ip, sizeof(ip), address);
1045
1062
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);
1063
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1064
PRIdMAX ") on port %" PRIu16 "\n", name,
1065
host_name, ip, (intmax_t)interface, port);
1050
1066
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1067
int ret = start_mandos_communication(ip, (in_port_t)port,
1068
interface,
1069
avahi_proto_to_af(proto),
1070
mc);
1053
1071
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1072
avahi_simple_poll_quit(simple_poll);
1055
1073
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1074
if(not add_server(ip, (in_port_t)port, interface,
1075
avahi_proto_to_af(proto),
1076
&((mandos_context*)mc)->current_server)){
1077
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
" list\n", name);
1079
}
1058
1080
}
1059
1081
}
1060
1082
}
1070
1092
const char *domain,
1071
1093
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1094
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1095
void* mc){
1096
if(b == NULL){
1097
return;
1098
}
1075
1099
1076
1100
/* Called whenever a new services becomes available on the LAN or
1077
1101
is removed from the LAN */
1084
1108
default:
1085
1109
case AVAHI_BROWSER_FAILURE:
1086
1110
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);
1111
fprintf_plus(stderr, "(Avahi browser) %s\n",
1112
avahi_strerror(avahi_server_errno
1113
(((mandos_context*)mc)->server)));
1114
avahi_simple_poll_quit(simple_poll);
1091
1115
return;
1092
1116
1093
1117
case AVAHI_BROWSER_NEW:
1096
1120
the callback function is called the Avahi server will free the
1097
1121
resolver for us. */
1098
1122
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)));
1123
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1124
interface, protocol, name, type,
1125
domain, protocol, 0,
1126
resolve_callback, mc) == NULL)
1127
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1128
" %s\n", name,
1129
avahi_strerror(avahi_server_errno
1130
(((mandos_context*)mc)->server)));
1105
1131
break;
1106
1132
1107
1133
case AVAHI_BROWSER_REMOVE:
1110
1136
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1137
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1138
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1139
fprintf_plus(stderr, "No Mandos server found, still"
1140
" searching...\n");
1115
1141
}
1116
1142
break;
1117
1143
}
1126
1152
signal_received = sig;
1127
1153
int old_errno = errno;
1128
1154
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1155
if(simple_poll != NULL){
1156
avahi_simple_poll_quit(simple_poll);
1131
1157
}
1132
1158
errno = old_errno;
1133
1159
}
1134
1160
1135
1161
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1162
int ret;
1163
error_t ret_errno;
1137
1164
1138
1165
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1166
if(s < 0){
1167
ret_errno = errno;
1140
1168
perror_plus("socket");
1169
errno = ret_errno;
1141
1170
return false;
1142
1171
}
1143
1172
strcpy(ifr->ifr_name, ifname);
1144
1173
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1174
if(ret == -1){
1146
1175
if(debug){
1176
ret_errno = errno;
1147
1177
perror_plus("ioctl SIOCGIFFLAGS");
1178
errno = ret_errno;
1148
1179
}
1149
1180
return false;
1150
1181
}
1156
1187
/* Reject the loopback device */
1157
1188
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1189
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1190
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1191
ifname);
1161
1192
}
1162
1193
return false;
1163
1194
}
1164
1195
/* Accept point-to-point devices only if connect_to is specified */
1165
1196
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1197
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1198
fprintf_plus(stderr, "Accepting point-to-point interface"
1199
" \"%s\"\n", ifname);
1169
1200
}
1170
1201
return true;
1171
1202
}
1172
1203
/* Otherwise, reject non-broadcast-capable devices */
1173
1204
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1205
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1206
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1207
" \"%s\"\n", ifname);
1177
1208
}
1178
1209
return false;
1179
1210
}
1180
1211
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1212
if(ifr->ifr_flags & IFF_NOARP){
1182
1213
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1214
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1215
ifname);
1185
1216
}
1186
1217
return false;
1187
1218
}
1188
1219
1189
1220
/* Accept this device */
1190
1221
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1222
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1223
}
1194
1224
return true;
1195
1225
}
1207
1237
struct ifreq ifr;
1208
1238
if(not get_flags(if_entry->d_name, &ifr)){
1209
1239
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;
1240
fprintf_plus(stderr, "Failed to get flags for interface "
1241
"\"%s\"\n", if_entry->d_name);
1242
}
1243
return 0;
1244
}
1245
1246
if(not good_flags(if_entry->d_name, &ifr)){
1247
return 0;
1248
}
1249
return 1;
1250
}
1251
1252
/*
1253
* This function determines if a network interface is up.
1254
*/
1255
bool interface_is_up(const char *interface){
1256
struct ifreq ifr;
1257
if(not get_flags(interface, &ifr)){
1258
if(debug){
1259
fprintf_plus(stderr, "Failed to get flags for interface "
1260
"\"%s\"\n", interface);
1261
}
1262
return false;
1263
}
1264
1265
return (bool)(ifr.ifr_flags & IFF_UP);
1266
}
1267
1268
/*
1269
* This function determines if a network interface is running
1270
*/
1271
bool interface_is_running(const char *interface){
1272
struct ifreq ifr;
1273
if(not get_flags(interface, &ifr)){
1274
if(debug){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1277
}
1278
return false;
1279
}
1280
1281
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1267
1282
}
1268
1283
1269
1284
int notdotentries(const struct dirent *direntry){
1295
1310
if((direntry->d_name)[sret] != '\0'){
1296
1311
/* Contains non-allowed characters */
1297
1312
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1314
direntry->d_name);
1301
1315
}
1302
1316
return 0;
1303
1317
}
1319
1333
if(not (S_ISREG(st.st_mode))){
1320
1334
/* Not a regular file */
1321
1335
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1336
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1337
direntry->d_name);
1325
1338
}
1326
1339
return 0;
1327
1340
}
1328
1341
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1342
/* Not executable */
1330
1343
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1345
direntry->d_name);
1334
1346
}
1335
1347
return 0;
1336
1348
}
1349
if(debug){
1350
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1351
direntry->d_name);
1352
}
1337
1353
return 1;
1338
1354
}
1339
1355
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1356
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1357
mandos_context *mc){
1341
1358
int ret;
1342
1359
struct timespec now;
1343
1360
struct timespec waited_time;
1344
1361
intmax_t block_time;
1345
1362
1346
1363
while(true){
1347
if(mc.current_server == NULL){
1364
if(mc->current_server == NULL){
1348
1365
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1366
fprintf_plus(stderr, "Wait until first server is found."
1367
" No timeout!\n");
1351
1368
}
1352
1369
ret = avahi_simple_poll_iterate(s, -1);
1353
1370
} else {
1354
1371
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1372
fprintf_plus(stderr, "Check current_server if we should run"
1373
" it, or wait\n");
1358
1374
}
1359
1375
/* the current time */
1360
1376
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1381
/* Calculating in ms how long time between now and server
1366
1382
who we visted longest time ago. Now - last seen. */
1367
1383
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1384
- mc->current_server->last_seen.tv_sec);
1369
1385
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1386
- mc->current_server->last_seen.tv_nsec);
1371
1387
/* total time is 10s/10,000ms.
1372
1388
Converting to s from ms by dividing by 1,000,
1373
1389
and ns to ms by dividing by 1,000,000. */
1376
1392
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1393
1378
1394
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1395
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1396
block_time);
1381
1397
}
1382
1398
1383
1399
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);
1400
ret = start_mandos_communication(mc->current_server->ip,
1401
mc->current_server->port,
1402
mc->current_server->if_index,
1403
mc->current_server->af, mc);
1388
1404
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1405
avahi_simple_poll_quit(s);
1390
1406
return 0;
1391
1407
}
1392
1408
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1409
&mc->current_server->last_seen);
1394
1410
if(ret == -1){
1395
1411
perror_plus("clock_gettime");
1396
1412
return -1;
1397
1413
}
1398
mc.current_server = mc.current_server->next;
1414
mc->current_server = mc->current_server->next;
1399
1415
block_time = 0; /* Call avahi to find new Mandos
1400
1416
servers, but don't block */
1401
1417
}
1410
1426
}
1411
1427
}
1412
1428
1429
/* Set effective uid to 0, return errno */
1430
error_t raise_privileges(void){
1431
error_t old_errno = errno;
1432
error_t ret_errno = 0;
1433
if(seteuid(0) == -1){
1434
ret_errno = errno;
1435
perror_plus("seteuid");
1436
}
1437
errno = old_errno;
1438
return ret_errno;
1439
}
1440
1441
/* Set effective and real user ID to 0. Return errno. */
1442
error_t raise_privileges_permanently(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = raise_privileges();
1445
if(ret_errno != 0){
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
if(setuid(0) == -1){
1450
ret_errno = errno;
1451
perror_plus("seteuid");
1452
}
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
1457
/* Set effective user ID to unprivileged saved user ID */
1458
error_t lower_privileges(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = 0;
1461
if(seteuid(uid) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Lower privileges permanently */
1470
error_t lower_privileges_permanently(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(setuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("setuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1413
1481
bool run_network_hooks(const char *mode, const char *interface,
1414
1482
const float delay){
1415
1483
struct dirent **direntries;
1418
1486
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1419
1487
alphasort);
1420
1488
if(numhooks == -1){
1421
perror_plus("scandir");
1489
if(errno == ENOENT){
1490
if(debug){
1491
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1492
" found\n", hookdir);
1493
}
1494
} else {
1495
perror_plus("scandir");
1496
}
1422
1497
} else {
1423
1498
int devnull = open("/dev/null", O_RDONLY);
1424
1499
for(int i = 0; i < numhooks; i++){
1425
direntry = direntries[0];
1500
direntry = direntries[i];
1426
1501
char *fullname = NULL;
1427
1502
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1428
1503
if(ret < 0){
1429
1504
perror_plus("asprintf");
1430
1505
continue;
1431
1506
}
1507
if(debug){
1508
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1509
direntry->d_name);
1510
}
1432
1511
pid_t hook_pid = fork();
1433
1512
if(hook_pid == 0){
1434
1513
/* Child */
1514
/* Raise privileges */
1515
raise_privileges_permanently();
1516
/* Set group */
1517
errno = 0;
1518
ret = setgid(0);
1519
if(ret == -1){
1520
perror_plus("setgid");
1521
}
1522
/* Reset supplementary groups */
1523
errno = 0;
1524
ret = setgroups(0, NULL);
1525
if(ret == -1){
1526
perror_plus("setgroups");
1527
}
1435
1528
dup2(devnull, STDIN_FILENO);
1436
1529
close(devnull);
1437
1530
dup2(STDERR_FILENO, STDOUT_FILENO);
1438
1531
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
1532
if(ret == -1){
1440
1533
perror_plus("setenv");
1441
return false;
1534
_exit(EX_OSERR);
1442
1535
}
1443
1536
ret = setenv("DEVICE", interface, 1);
1444
1537
if(ret == -1){
1445
1538
perror_plus("setenv");
1446
return false;
1539
_exit(EX_OSERR);
1447
1540
}
1448
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1541
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1449
1542
if(ret == -1){
1450
1543
perror_plus("setenv");
1451
return false;
1544
_exit(EX_OSERR);
1452
1545
}
1453
1546
ret = setenv("MODE", mode, 1);
1454
1547
if(ret == -1){
1455
1548
perror_plus("setenv");
1456
return false;
1549
_exit(EX_OSERR);
1457
1550
}
1458
1551
char *delaystring;
1459
1552
ret = asprintf(&delaystring, "%f", delay);
1460
1553
if(ret == -1){
1461
1554
perror_plus("asprintf");
1462
return false;
1555
_exit(EX_OSERR);
1463
1556
}
1464
1557
ret = setenv("DELAY", delaystring, 1);
1465
1558
if(ret == -1){
1466
1559
free(delaystring);
1467
1560
perror_plus("setenv");
1468
return false;
1561
_exit(EX_OSERR);
1469
1562
}
1470
1563
free(delaystring);
1471
ret = execl(fullname, direntry->d_name, mode, NULL);
1472
perror_plus("execl");
1564
if(connect_to != NULL){
1565
ret = setenv("CONNECT", connect_to, 1);
1566
if(ret == -1){
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
}
1571
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1572
perror_plus("execl");
1573
_exit(EXIT_FAILURE);
1574
}
1473
1575
} else {
1474
1576
int status;
1475
1577
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1479
1581
}
1480
1582
if(WIFEXITED(status)){
1481
1583
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));
1584
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1585
" with status %d\n", direntry->d_name,
1586
WEXITSTATUS(status));
1486
1587
free(fullname);
1487
1588
continue;
1488
1589
}
1489
1590
} 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));
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1592
" signal %d\n", direntry->d_name,
1593
WTERMSIG(status));
1494
1594
free(fullname);
1495
1595
continue;
1496
1596
} else {
1497
fprintf(stderr, "Mandos plugin mandos-client: "
1498
"Warning: network hook \"%s\" crashed\n",
1499
direntry->d_name);
1597
fprintf_plus(stderr, "Warning: network hook \"%s\""
1598
" crashed\n", direntry->d_name);
1500
1599
free(fullname);
1501
1600
continue;
1502
1601
}
1503
1602
}
1504
1603
free(fullname);
1505
if(quit_now){
1506
break;
1604
if(debug){
1605
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1606
direntry->d_name);
1507
1607
}
1508
1608
}
1509
1609
close(devnull);
1511
1611
return true;
1512
1612
}
1513
1613
1614
error_t bring_up_interface(const char *const interface,
1615
const float delay){
1616
int sd = -1;
1617
error_t old_errno = errno;
1618
error_t ret_errno = 0;
1619
int ret, ret_setflags;
1620
struct ifreq network;
1621
unsigned int if_index = if_nametoindex(interface);
1622
if(if_index == 0){
1623
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1624
errno = old_errno;
1625
return ENXIO;
1626
}
1627
1628
if(quit_now){
1629
errno = old_errno;
1630
return EINTR;
1631
}
1632
1633
if(not interface_is_up(interface)){
1634
if(not get_flags(interface, &network) and debug){
1635
ret_errno = errno;
1636
fprintf_plus(stderr, "Failed to get flags for interface "
1637
"\"%s\"\n", interface);
1638
return ret_errno;
1639
}
1640
network.ifr_flags |= IFF_UP;
1641
1642
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
if(sd < 0){
1644
ret_errno = errno;
1645
perror_plus("socket");
1646
errno = old_errno;
1647
return ret_errno;
1648
}
1649
1650
if(quit_now){
1651
close(sd);
1652
errno = old_errno;
1653
return EINTR;
1654
}
1655
1656
if(debug){
1657
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1658
interface);
1659
}
1660
1661
/* Raise priviliges */
1662
raise_privileges();
1663
1664
#ifdef __linux__
1665
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1666
messages about the network interface to mess up the prompt */
1667
int ret_linux = klogctl(8, NULL, 5);
1668
bool restore_loglevel = true;
1669
if(ret_linux == -1){
1670
restore_loglevel = false;
1671
perror_plus("klogctl");
1672
}
1673
#endif /* __linux__ */
1674
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1675
ret_errno = errno;
1676
#ifdef __linux__
1677
if(restore_loglevel){
1678
ret_linux = klogctl(7, NULL, 0);
1679
if(ret_linux == -1){
1680
perror_plus("klogctl");
1681
}
1682
}
1683
#endif /* __linux__ */
1684
1685
/* Lower privileges */
1686
lower_privileges();
1687
1688
/* Close the socket */
1689
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1690
if(ret == -1){
1691
perror_plus("close");
1692
}
1693
1694
if(ret_setflags == -1){
1695
errno = ret_errno;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
errno = old_errno;
1698
return ret_errno;
1699
}
1700
} else if(debug){
1701
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1702
interface);
1703
}
1704
1705
/* Sleep checking until interface is running.
1706
Check every 0.25s, up to total time of delay */
1707
for(int i=0; i < delay * 4; i++){
1708
if(interface_is_running(interface)){
1709
break;
1710
}
1711
struct timespec sleeptime = { .tv_nsec = 250000000 };
1712
ret = nanosleep(&sleeptime, NULL);
1713
if(ret == -1 and errno != EINTR){
1714
perror_plus("nanosleep");
1715
}
1716
}
1717
1718
errno = old_errno;
1719
return 0;
1720
}
1721
1722
error_t take_down_interface(const char *const interface){
1723
int sd = -1;
1724
error_t old_errno = errno;
1725
error_t ret_errno = 0;
1726
int ret, ret_setflags;
1727
struct ifreq network;
1728
unsigned int if_index = if_nametoindex(interface);
1729
if(if_index == 0){
1730
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1731
errno = old_errno;
1732
return ENXIO;
1733
}
1734
if(interface_is_up(interface)){
1735
if(not get_flags(interface, &network) and debug){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
return ret_errno;
1740
}
1741
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1742
1743
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1744
if(sd < 0){
1745
ret_errno = errno;
1746
perror_plus("socket");
1747
errno = old_errno;
1748
return ret_errno;
1749
}
1750
1751
if(debug){
1752
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1753
interface);
1754
}
1755
1756
/* Raise priviliges */
1757
raise_privileges();
1758
1759
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1760
ret_errno = errno;
1761
1762
/* Lower privileges */
1763
lower_privileges();
1764
1765
/* Close the socket */
1766
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1767
if(ret == -1){
1768
perror_plus("close");
1769
}
1770
1771
if(ret_setflags == -1){
1772
errno = ret_errno;
1773
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1774
errno = old_errno;
1775
return ret_errno;
1776
}
1777
} else if(debug){
1778
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1779
interface);
1780
}
1781
1782
errno = old_errno;
1783
return 0;
1784
}
1785
1514
1786
int main(int argc, char *argv[]){
1787
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1788
.priority = "SECURE256:!CTYPE-X.509:"
1789
"+CTYPE-OPENPGP", .current_server = NULL,
1790
.interfaces = NULL, .interfaces_size = 0 };
1515
1791
AvahiSServiceBrowser *sb = NULL;
1516
int error;
1792
error_t ret_errno;
1517
1793
int ret;
1518
1794
intmax_t tmpmax;
1519
1795
char *tmp;
1520
1796
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;
1797
char *interfaces_to_take_down = NULL;
1798
size_t interfaces_to_take_down_size = 0;
1527
1799
char tempdir[] = "/tmp/mandosXXXXXX";
1528
1800
bool tempdir_created = false;
1529
1801
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
1802
const char *seckey = PATHDIR "/" SECKEY;
1531
1803
const char *pubkey = PATHDIR "/" PUBKEY;
1804
char *interfaces_hooks = NULL;
1805
size_t interfaces_hooks_size = 0;
1532
1806
1533
1807
bool gnutls_initialized = false;
1534
1808
bool gpgme_initialized = false;
1596
1870
.group = 2 },
1597
1871
{ .name = "retry", .key = 132,
1598
1872
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1873
.doc = "Retry interval used when denied by the Mandos server",
1600
1874
.group = 2 },
1601
1875
{ .name = "network-hook-dir", .key = 133,
1602
1876
.arg = "DIR",
1625
1899
connect_to = arg;
1626
1900
break;
1627
1901
case 'i': /* --interface */
1628
interface = arg;
1902
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1903
arg, (int)',');
1904
if(ret_errno != 0){
1905
argp_error(state, "%s", strerror(ret_errno));
1906
}
1629
1907
break;
1630
1908
case 's': /* --seckey */
1631
1909
seckey = arg;
1674
1952
argp_state_help(state, state->out_stream,
1675
1953
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
1954
case 'V': /* --version */
1677
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1678
fprintf(state->out_stream, "%s\n", argp_program_version);
1955
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
1956
exit(argp_err_exit_status);
1680
1957
break;
1681
1958
default:
1708
1985
{
1709
1986
/* Work around Debian bug #633582:
1710
1987
<http://bugs.debian.org/633582> */
1711
struct stat st;
1712
1988
1713
1989
/* 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");
1990
if(raise_privileges() == 0){
1991
struct stat st;
1992
1993
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1994
int seckey_fd = open(seckey, O_RDONLY);
1995
if(seckey_fd == -1){
1996
perror_plus("open");
1997
} else {
1998
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1999
if(ret == -1){
2000
perror_plus("fstat");
2001
} else {
2002
if(S_ISREG(st.st_mode)
2003
and st.st_uid == 0 and st.st_gid == 0){
2004
ret = fchown(seckey_fd, uid, gid);
2005
if(ret == -1){
2006
perror_plus("fchown");
2007
}
2008
}
2009
}
2010
TEMP_FAILURE_RETRY(close(seckey_fd));
2011
}
2012
}
2013
2014
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2015
int pubkey_fd = open(pubkey, O_RDONLY);
2016
if(pubkey_fd == -1){
2017
perror_plus("open");
2018
} else {
2019
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2020
if(ret == -1){
2021
perror_plus("fstat");
2022
} else {
2023
if(S_ISREG(st.st_mode)
2024
and st.st_uid == 0 and st.st_gid == 0){
2025
ret = fchown(pubkey_fd, uid, gid);
2026
if(ret == -1){
2027
perror_plus("fchown");
2028
}
2029
}
2030
}
2031
TEMP_FAILURE_RETRY(close(pubkey_fd));
2032
}
2033
}
2034
2035
/* Lower privileges */
2036
lower_privileges();
2037
}
2038
}
2039
2040
/* Remove invalid interface names (except "none") */
2041
{
2042
char *interface = NULL;
2043
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2044
interface))){
2045
if(strcmp(interface, "none") != 0
2046
and if_nametoindex(interface) == 0){
2047
if(interface[0] != '\0'){
2048
fprintf_plus(stderr, "Not using nonexisting interface"
2049
" \"%s\"\n", interface);
2050
}
2051
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2052
interface = NULL;
2053
}
1765
2054
}
1766
2055
}
1767
2056
1768
2057
/* Run network hooks */
1769
2058
{
1770
/* Re-raise priviliges */
1771
errno = 0;
1772
ret = seteuid(0);
1773
if(ret == -1){
1774
perror_plus("seteuid");
2059
if(mc.interfaces != NULL){
2060
interfaces_hooks = malloc(mc.interfaces_size);
2061
if(interfaces_hooks == NULL){
2062
perror_plus("malloc");
2063
goto end;
2064
}
2065
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2066
interfaces_hooks_size = mc.interfaces_size;
2067
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2068
(int)',');
1775
2069
}
1776
if(not run_network_hooks("start", interface, delay)){
2070
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2071
interfaces_hooks : "", delay)){
1777
2072
goto end;
1778
2073
}
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
2074
}
1786
2075
1787
2076
if(not debug){
1788
2077
avahi_set_log_function(empty_log);
1789
2078
}
1790
2079
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
2080
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1826
2081
from the signal handler */
1827
2082
/* Initialize the pseudo-RNG for Avahi */
1828
2083
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");
2084
simple_poll = avahi_simple_poll_new();
2085
if(simple_poll == NULL){
2086
fprintf_plus(stderr,
2087
"Avahi: Failed to create simple poll object.\n");
1833
2088
exitcode = EX_UNAVAILABLE;
1834
2089
goto end;
1835
2090
}
1897
2152
}
1898
2153
}
1899
2154
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");
2155
/* If no interfaces were specified, make a list */
2156
if(mc.interfaces == NULL){
2157
struct dirent **direntries;
2158
/* Look for any good interfaces */
2159
ret = scandir(sys_class_net, &direntries, good_interface,
2160
alphasort);
2161
if(ret >= 1){
2162
/* Add all found interfaces to interfaces list */
2163
for(int i = 0; i < ret; ++i){
2164
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2165
direntries[i]->d_name);
2166
if(ret_errno != 0){
2167
perror_plus("argz_add");
2168
continue;
2169
}
2170
if(debug){
2171
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2172
direntries[i]->d_name);
2173
}
2174
}
2175
free(direntries);
2176
} else {
2177
free(direntries);
2178
fprintf_plus(stderr, "Could not find a network interface\n");
2179
exitcode = EXIT_FAILURE;
2180
goto end;
2181
}
2182
}
2183
2184
/* Bring up interfaces which are down */
2185
{
2186
char *interface = NULL;
2187
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2188
interface))){
2189
/* If interface name is "none", stop bringing up interfaces.
2190
Also remove all instances of "none" from the list */
2191
if(strcmp(interface, "none") == 0){
2192
argz_delete(&mc.interfaces, &mc.interfaces_size,
2193
interface);
2194
interface = NULL;
2195
while((interface = argz_next(mc.interfaces,
2196
mc.interfaces_size, interface))){
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
1986
2201
}
1987
2202
}
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
2203
break;
2006
2204
}
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
}
2205
bool interface_was_up = interface_is_up(interface);
2206
ret = bring_up_interface(interface, delay);
2207
if(not interface_was_up){
2208
if(ret != 0){
2209
errno = ret;
2210
perror_plus("Failed to bring up interface");
2211
} else {
2212
ret_errno = argz_add(&interfaces_to_take_down,
2213
&interfaces_to_take_down_size,
2214
interface);
2215
}
2216
}
2217
}
2218
if(debug and (interfaces_to_take_down == NULL)){
2219
fprintf_plus(stderr, "No interfaces were brought up\n");
2220
}
2221
}
2222
2223
/* If we only got one interface, explicitly use only that one */
2224
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2225
if(debug){
2226
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2227
mc.interfaces);
2228
}
2229
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2230
}
2037
2231
2038
2232
if(quit_now){
2039
2233
goto end;
2040
2234
}
2041
2235
2042
ret = init_gnutls_global(pubkey, seckey);
2236
ret = init_gnutls_global(pubkey, seckey, &mc);
2043
2237
if(ret == -1){
2044
fprintf(stderr, "Mandos plugin mandos-client: "
2045
"init_gnutls_global failed\n");
2238
fprintf_plus(stderr, "init_gnutls_global failed\n");
2046
2239
exitcode = EX_UNAVAILABLE;
2047
2240
goto end;
2048
2241
} else {
2063
2256
goto end;
2064
2257
}
2065
2258
2066
if(not init_gpgme(pubkey, seckey, tempdir)){
2067
fprintf(stderr, "Mandos plugin mandos-client: "
2068
"init_gpgme failed\n");
2259
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2260
fprintf_plus(stderr, "init_gpgme failed\n");
2069
2261
exitcode = EX_UNAVAILABLE;
2070
2262
goto end;
2071
2263
} else {
2080
2272
/* Connect directly, do not use Zeroconf */
2081
2273
/* (Mainly meant for debugging) */
2082
2274
char *address = strrchr(connect_to, ':');
2275
2083
2276
if(address == NULL){
2084
fprintf(stderr, "Mandos plugin mandos-client: "
2085
"No colon in address\n");
2277
fprintf_plus(stderr, "No colon in address\n");
2086
2278
exitcode = EX_USAGE;
2087
2279
goto end;
2088
2280
}
2091
2283
goto end;
2092
2284
}
2093
2285
2094
uint16_t port;
2286
in_port_t port;
2095
2287
errno = 0;
2096
2288
tmpmax = strtoimax(address+1, &tmp, 10);
2097
2289
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");
2290
or tmpmax != (in_port_t)tmpmax){
2291
fprintf_plus(stderr, "Bad port number\n");
2101
2292
exitcode = EX_USAGE;
2102
2293
goto end;
2103
2294
}
2104
2295
2105
2296
if(quit_now){
2106
2297
goto end;
2107
2298
}
2108
2299
2109
port = (uint16_t)tmpmax;
2300
port = (in_port_t)tmpmax;
2110
2301
*address = '\0';
2111
2302
/* Colon in address indicates IPv6 */
2112
2303
int af;
2128
2319
}
2129
2320
2130
2321
while(not quit_now){
2131
ret = start_mandos_communication(address, port, if_index, af);
2322
ret = start_mandos_communication(address, port, if_index, af,
2323
&mc);
2132
2324
if(quit_now or ret == 0){
2133
2325
break;
2134
2326
}
2135
2327
if(debug){
2136
fprintf(stderr, "Mandos plugin mandos-client: "
2137
"Retrying in %d seconds\n", (int)retry_interval);
2328
fprintf_plus(stderr, "Retrying in %d seconds\n",
2329
(int)retry_interval);
2138
2330
}
2139
2331
sleep((int)retry_interval);
2140
2332
}
2160
2352
config.publish_domain = 0;
2161
2353
2162
2354
/* Allocate a new server */
2163
mc.server = avahi_server_new(avahi_simple_poll_get
2164
(mc.simple_poll), &config, NULL,
2165
NULL, &error);
2355
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2356
&config, NULL, NULL, &ret_errno);
2166
2357
2167
2358
/* Free the Avahi configuration data */
2168
2359
avahi_server_config_free(&config);
2170
2361
2171
2362
/* Check if creating the Avahi server object succeeded */
2172
2363
if(mc.server == NULL){
2173
fprintf(stderr, "Mandos plugin mandos-client: "
2174
"Failed to create Avahi server: %s\n",
2175
avahi_strerror(error));
2364
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2365
avahi_strerror(ret_errno));
2176
2366
exitcode = EX_UNAVAILABLE;
2177
2367
goto end;
2178
2368
}
2184
2374
/* Create the Avahi service browser */
2185
2375
sb = avahi_s_service_browser_new(mc.server, if_index,
2186
2376
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2187
NULL, 0, browse_callback, NULL);
2377
NULL, 0, browse_callback,
2378
(void *)&mc);
2188
2379
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)));
2380
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2381
avahi_strerror(avahi_server_errno(mc.server)));
2192
2382
exitcode = EX_UNAVAILABLE;
2193
2383
goto end;
2194
2384
}
2200
2390
/* Run the main loop */
2201
2391
2202
2392
if(debug){
2203
fprintf(stderr, "Mandos plugin mandos-client: "
2204
"Starting Avahi loop search\n");
2393
fprintf_plus(stderr, "Starting Avahi loop search\n");
2205
2394
}
2206
2395
2207
ret = avahi_loop_with_timeout(mc.simple_poll,
2208
(int)(retry_interval * 1000));
2396
ret = avahi_loop_with_timeout(simple_poll,
2397
(int)(retry_interval * 1000), &mc);
2209
2398
if(debug){
2210
fprintf(stderr, "Mandos plugin mandos-client: "
2211
"avahi_loop_with_timeout exited %s\n",
2212
(ret == 0) ? "successfully" : "with error");
2399
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2400
(ret == 0) ? "successfully" : "with error");
2213
2401
}
2214
2402
2215
2403
end:
2216
2404
2217
2405
if(debug){
2218
fprintf(stderr, "Mandos plugin mandos-client: "
2219
"%s exiting\n", argv[0]);
2406
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2220
2407
}
2221
2408
2222
2409
/* Cleanup things */
2410
free(mc.interfaces);
2411
2223
2412
if(sb != NULL)
2224
2413
avahi_s_service_browser_free(sb);
2225
2414
2226
2415
if(mc.server != NULL)
2227
2416
avahi_server_free(mc.server);
2228
2417
2229
if(mc.simple_poll != NULL)
2230
avahi_simple_poll_free(mc.simple_poll);
2418
if(simple_poll != NULL)
2419
avahi_simple_poll_free(simple_poll);
2231
2420
2232
2421
if(gnutls_initialized){
2233
2422
gnutls_certificate_free_credentials(mc.cred);
2238
2427
if(gpgme_initialized){
2239
2428
gpgme_release(mc.ctx);
2240
2429
}
2241
2430
2242
2431
/* Cleans up the circular linked list of Mandos servers the client
2243
2432
has seen */
2244
2433
if(mc.current_server != NULL){
2252
2441
2253
2442
/* Re-raise priviliges */
2254
2443
{
2255
errno = 0;
2256
ret = seteuid(0);
2257
if(ret == -1){
2258
perror_plus("seteuid");
2259
}
2444
raise_privileges();
2445
2260
2446
/* Run network hooks */
2261
if(not run_network_hooks("stop", interface, delay)){
2262
goto end;
2263
}
2447
run_network_hooks("stop", interfaces_hooks != NULL ?
2448
interfaces_hooks : "", delay);
2264
2449
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");
2450
/* Take down the network interfaces which were brought up */
2451
{
2452
char *interface = NULL;
2453
while((interface=argz_next(interfaces_to_take_down,
2454
interfaces_to_take_down_size,
2455
interface))){
2456
ret_errno = take_down_interface(interface);
2457
if(ret_errno != 0){
2458
errno = ret_errno;
2459
perror_plus("Failed to take down interface");
2275
2460
}
2276
2461
}
2277
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2278
if(ret == -1){
2279
perror_plus("close");
2462
if(debug and (interfaces_to_take_down == NULL)){
2463
fprintf_plus(stderr, "No interfaces needed to be taken"
2464
" down\n");
2280
2465
}
2281
2466
}
2282
}
2283
/* Lower privileges permanently */
2284
errno = 0;
2285
ret = setuid(uid);
2286
if(ret == -1){
2287
perror_plus("setuid");
2288
}
2467
2468
lower_privileges_permanently();
2469
}
2470
2471
free(interfaces_to_take_down);
2472
free(interfaces_hooks);
2289
2473
2290
2474
/* Removes the GPGME temp directory and all files inside */
2291
2475
if(tempdir_created){
2305
2489
}
2306
2490
ret = remove(fullname);
2307
2491
if(ret == -1){
2308
fprintf(stderr, "Mandos plugin mandos-client: "
2309
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2492
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2493
strerror(errno));
2310
2494
}
2311
2495
free(fullname);
2312
2496
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0