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- Committer: teddy at bsnet
- Date: 2011-11-13 13:55:45 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111113135545-hyb59g1q2icwdcte
* plugins.d/mandos-client.c: Some white space fixes.
(runnable_hook): Simplify name rule. More debug messages.
(runnable_hook): Simplify name rule. More debug messages.
- files removed:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
setgid(), pause() */
76
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
86
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
89
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
90
95
91
#ifdef __linux__
96
92
#include <sys/klog.h> /* klogctl() */
138
134
static const char sys_class_net[] = "/sys/class/net";
139
135
char *connect_to = NULL;
140
136
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
137
144
138
/* Doubly linked list that need to be circularly linked when used */
145
139
typedef struct server{
146
140
const char *ip;
147
in_port_t port;
141
uint16_t port;
148
142
AvahiIfIndex if_index;
149
143
int af;
150
144
struct timespec last_seen;
154
148
155
149
/* Used for passing in values through the Avahi callback functions */
156
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
157
152
AvahiServer *server;
158
153
gnutls_certificate_credentials_t cred;
159
154
unsigned int dh_bits;
161
156
const char *priority;
162
157
gpgme_ctx_t ctx;
163
158
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
159
} mandos_context;
167
160
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
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 };
170
166
171
167
sig_atomic_t quit_now = 0;
172
168
int signal_received = 0;
173
169
174
170
/* Function to use when printing errors */
175
171
void perror_plus(const char *print_text){
176
int e = errno;
177
172
fprintf(stderr, "Mandos plugin %s: ",
178
173
program_invocation_short_name);
179
errno = e;
180
174
perror(print_text);
181
175
}
182
176
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
177
/*
194
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
179
* bytes. "buffer_capacity" is how much is currently allocated,
208
192
}
209
193
210
194
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
213
197
int ret;
214
198
server *new_server = malloc(sizeof(server));
215
199
if(new_server == NULL){
216
200
perror_plus("malloc");
217
return false;
201
return -1;
218
202
}
219
203
*new_server = (server){ .ip = strdup(ip),
220
204
.port = port,
222
206
.af = af };
223
207
if(new_server->ip == NULL){
224
208
perror_plus("strdup");
225
return false;
209
return -1;
226
210
}
227
211
/* Special case of first server */
228
if(*current_server == NULL){
212
if (mc.current_server == NULL){
229
213
new_server->next = new_server;
230
214
new_server->prev = new_server;
231
*current_server = new_server;
215
mc.current_server = new_server;
232
216
/* Place the new server last in the list */
233
217
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
236
220
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
221
mc.current_server->prev = new_server;
238
222
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
224
if(ret == -1){
241
225
perror_plus("clock_gettime");
242
return false;
226
return -1;
243
227
}
244
return true;
228
return 0;
245
229
}
246
230
247
231
/*
248
232
* Initialize GPGME.
249
233
*/
250
234
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
235
const char *tempdir){
252
236
gpgme_error_t rc;
253
237
gpgme_engine_info_t engine_info;
254
238
239
255
240
/*
256
241
* Helper function to insert pub and seckey to the engine keyring.
257
242
*/
268
253
269
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
255
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
273
259
return false;
274
260
}
275
261
276
rc = gpgme_op_import(mc->ctx, pgp_data);
262
rc = gpgme_op_import(mc.ctx, pgp_data);
277
263
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
280
267
return false;
281
268
}
282
269
289
276
}
290
277
291
278
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
293
281
}
294
282
295
283
/* Init GPGME */
296
284
gpgme_check_version(NULL);
297
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
286
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
301
290
return false;
302
291
}
303
292
304
293
/* Set GPGME home directory for the OpenPGP engine only */
305
294
rc = gpgme_get_engine_info(&engine_info);
306
295
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
309
299
return false;
310
300
}
311
301
while(engine_info != NULL){
317
307
engine_info = engine_info->next;
318
308
}
319
309
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
322
312
return false;
323
313
}
324
314
325
315
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
316
rc = gpgme_new(&(mc.ctx));
327
317
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
331
321
return false;
332
322
}
333
323
344
334
*/
345
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
336
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
337
char **plaintext){
349
338
gpgme_data_t dh_crypto, dh_plain;
350
339
gpgme_error_t rc;
351
340
ssize_t ret;
353
342
ssize_t plaintext_length = 0;
354
343
355
344
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
357
347
}
358
348
359
349
/* Create new GPGME data buffer from memory cryptotext */
360
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
351
0);
362
352
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
365
356
return -1;
366
357
}
367
358
368
359
/* Create new empty GPGME data buffer for the plaintext */
369
360
rc = gpgme_data_new(&dh_plain);
370
361
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
374
365
gpgme_data_release(dh_crypto);
375
366
return -1;
376
367
}
377
368
378
369
/* Decrypt data from the cryptotext data buffer to the plaintext
379
370
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
372
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
384
376
plaintext_length = -1;
385
377
if(debug){
386
378
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
388
380
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
390
383
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
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);
395
390
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
397
393
}
398
394
gpgme_recipient_t recipient;
399
395
recipient = result->recipients;
400
396
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
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");
408
406
recipient = recipient->next;
409
407
}
410
408
}
413
411
}
414
412
415
413
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
417
416
}
418
417
419
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
450
449
}
451
450
452
451
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"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);
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
472
473
if(ret == NULL)
473
474
ret = "(unknown)";
474
475
return ret;
477
478
/* GnuTLS log function callback */
478
479
static void debuggnutls(__attribute__((unused)) int level,
479
480
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
481
482
}
482
483
483
484
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
485
const char *seckeyfilename){
486
486
int ret;
487
487
488
488
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
490
491
}
491
492
492
493
ret = gnutls_global_init();
493
494
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
496
497
return -1;
497
498
}
498
499
505
506
}
506
507
507
508
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
510
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
512
513
gnutls_global_deinit();
513
514
return -1;
514
515
}
515
516
516
517
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
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);
521
522
}
522
523
523
524
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
525
526
GNUTLS_OPENPGP_FMT_BASE64);
526
527
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
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));
532
534
goto globalfail;
533
535
}
534
536
535
537
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
537
539
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
541
543
goto globalfail;
542
544
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
546
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
547
550
goto globalfail;
548
551
}
549
552
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
554
552
555
return 0;
553
556
554
557
globalfail:
555
558
556
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
557
560
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
559
562
return -1;
560
563
}
561
564
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
565
static int init_gnutls_session(gnutls_session_t *session){
564
566
int ret;
565
567
/* GnuTLS session creation */
566
568
do {
570
572
}
571
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
574
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
576
578
}
577
579
578
580
{
579
581
const char *err;
580
582
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
584
if(quit_now){
583
585
gnutls_deinit(*session);
584
586
return -1;
585
587
}
586
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
589
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
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));
591
594
gnutls_deinit(*session);
592
595
return -1;
593
596
}
595
598
596
599
do {
597
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
601
mc.cred);
599
602
if(quit_now){
600
603
gnutls_deinit(*session);
601
604
return -1;
602
605
}
603
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
607
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
607
611
gnutls_deinit(*session);
608
612
return -1;
609
613
}
611
615
/* ignore client certificate if any. */
612
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
617
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
619
616
620
return 0;
617
621
}
621
625
__attribute__((unused)) const char *txt){}
622
626
623
627
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
628
static int start_mandos_communication(const char *ip, uint16_t port,
625
629
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
630
int af){
627
631
int ret, tcp_sd = -1;
628
632
ssize_t sret;
629
633
union {
654
658
pf = PF_INET;
655
659
break;
656
660
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
658
663
errno = EINVAL;
659
664
return -1;
660
665
}
661
666
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);
667
ret = init_gnutls_session(&session);
695
668
if(ret != 0){
696
669
return -1;
697
670
}
698
671
699
672
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
702
676
}
703
677
704
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
730
704
}
731
705
if(ret == 0){
732
706
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
734
709
errno = e;
735
710
goto mandos_end;
736
711
}
737
712
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
739
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
719
-Wunreachable-code*/
742
720
if(if_index == AVAHI_IF_UNSPEC){
743
fprintf_plus(stderr, "An IPv6 link-local address is"
744
" incomplete without a network interface\n");
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
745
724
errno = EINVAL;
746
725
goto mandos_end;
747
726
}
765
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
745
perror_plus("if_indextoname");
767
746
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
770
750
}
771
751
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
774
754
}
775
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
786
766
perror_plus("inet_ntop");
787
767
} else {
788
768
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
790
771
}
791
772
}
792
773
}
846
827
}
847
828
848
829
if(debug){
849
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
850
832
}
851
833
852
834
if(quit_now){
854
836
goto mandos_end;
855
837
}
856
838
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);
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
862
841
863
842
if(quit_now){
864
843
errno = EINTR;
875
854
876
855
if(ret != GNUTLS_E_SUCCESS){
877
856
if(debug){
878
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
879
859
gnutls_perror(ret);
880
860
}
881
861
errno = EPROTO;
885
865
/* Read OpenPGP packet that contains the wanted password */
886
866
887
867
if(debug){
888
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
889
" %s\n", ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
890
870
}
891
871
892
872
while(true){
930
910
}
931
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
912
if(ret < 0){
933
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
934
"***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
935
915
gnutls_perror(ret);
936
916
errno = EPROTO;
937
917
goto mandos_end;
938
918
}
939
919
break;
940
920
default:
941
fprintf_plus(stderr, "Unknown error while reading data from"
942
" encrypted session with Mandos server\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
943
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
944
925
errno = EIO;
945
926
goto mandos_end;
950
931
}
951
932
952
933
if(debug){
953
fprintf_plus(stderr, "Closing TLS session\n");
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
954
936
}
955
937
956
938
if(quit_now){
969
951
if(buffer_length > 0){
970
952
ssize_t decrypted_buffer_size;
971
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
954
&decrypted_buffer);
973
955
if(decrypted_buffer_size >= 0){
974
956
975
957
written = 0;
985
967
if(ret == 0 and ferror(stdout)){
986
968
int e = errno;
987
969
if(debug){
988
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
989
strerror(errno));
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
990
973
}
991
974
errno = e;
992
975
goto mandos_end;
1036
1019
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
1020
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
1021
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1043
1024
1044
1025
/* Called whenever a service has been resolved successfully or
1045
1026
timed out */
1051
1032
switch(event){
1052
1033
default:
1053
1034
case AVAHI_RESOLVER_FAILURE:
1054
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
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)));
1059
1039
break;
1060
1040
1061
1041
case AVAHI_RESOLVER_FOUND:
1063
1043
char ip[AVAHI_ADDRESS_STR_MAX];
1064
1044
avahi_address_snprint(ip, sizeof(ip), address);
1065
1045
if(debug){
1066
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1067
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
host_name, ip, (intmax_t)interface, port);
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);
1069
1050
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1074
1053
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1054
avahi_simple_poll_quit(mc.simple_poll);
1076
1055
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1083
1058
}
1084
1059
}
1085
1060
}
1095
1070
const char *domain,
1096
1071
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1072
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1102
1075
1103
1076
/* Called whenever a new services becomes available on the LAN or
1104
1077
is removed from the LAN */
1111
1084
default:
1112
1085
case AVAHI_BROWSER_FAILURE:
1113
1086
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);
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);
1118
1091
return;
1119
1092
1120
1093
case AVAHI_BROWSER_NEW:
1123
1096
the callback function is called the Avahi server will free the
1124
1097
resolver for us. */
1125
1098
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)));
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)));
1134
1105
break;
1135
1106
1136
1107
case AVAHI_BROWSER_REMOVE:
1139
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
1140
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1141
1112
if(debug){
1142
fprintf_plus(stderr, "No Mandos server found, still"
1143
" searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1144
1115
}
1145
1116
break;
1146
1117
}
1155
1126
signal_received = sig;
1156
1127
int old_errno = errno;
1157
1128
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1160
1131
}
1161
1132
errno = old_errno;
1162
1133
}
1163
1134
1164
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
1136
int ret;
1166
error_t ret_errno;
1167
1137
1168
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
1139
if(s < 0){
1170
ret_errno = errno;
1171
1140
perror_plus("socket");
1172
errno = ret_errno;
1173
1141
return false;
1174
1142
}
1175
1143
strcpy(ifr->ifr_name, ifname);
1176
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
1145
if(ret == -1){
1178
1146
if(debug){
1179
ret_errno = errno;
1180
1147
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1182
1148
}
1183
1149
return false;
1184
1150
}
1190
1156
/* Reject the loopback device */
1191
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1192
1158
if(debug){
1193
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1194
ifname);
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1195
1161
}
1196
1162
return false;
1197
1163
}
1198
1164
/* Accept point-to-point devices only if connect_to is specified */
1199
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1200
1166
if(debug){
1201
fprintf_plus(stderr, "Accepting point-to-point interface"
1202
" \"%s\"\n", ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1203
1169
}
1204
1170
return true;
1205
1171
}
1206
1172
/* Otherwise, reject non-broadcast-capable devices */
1207
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1208
1174
if(debug){
1209
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1210
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1211
1177
}
1212
1178
return false;
1213
1179
}
1214
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1215
1181
if(ifr->ifr_flags & IFF_NOARP){
1216
1182
if(debug){
1217
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1218
ifname);
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1219
1185
}
1220
1186
return false;
1221
1187
}
1222
1188
1223
1189
/* Accept this device */
1224
1190
if(debug){
1225
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1226
1193
}
1227
1194
return true;
1228
1195
}
1240
1207
struct ifreq ifr;
1241
1208
if(not get_flags(if_entry->d_name, &ifr)){
1242
1209
if(debug){
1243
fprintf_plus(stderr, "Failed to get flags for interface "
1244
"\"%s\"\n", if_entry->d_name);
1245
}
1246
return 0;
1247
}
1248
1249
if(not good_flags(if_entry->d_name, &ifr)){
1250
return 0;
1251
}
1252
return 1;
1253
}
1254
1255
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
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;
1285
1267
}
1286
1268
1287
1269
int notdotentries(const struct dirent *direntry){
1313
1295
if((direntry->d_name)[sret] != '\0'){
1314
1296
/* Contains non-allowed characters */
1315
1297
if(debug){
1316
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1317
direntry->d_name);
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1318
1301
}
1319
1302
return 0;
1320
1303
}
1336
1319
if(not (S_ISREG(st.st_mode))){
1337
1320
/* Not a regular file */
1338
1321
if(debug){
1339
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1340
direntry->d_name);
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1341
1325
}
1342
1326
return 0;
1343
1327
}
1344
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1345
1329
/* Not executable */
1346
1330
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1348
direntry->d_name);
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1349
1334
}
1350
1335
return 0;
1351
1336
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1356
1337
return 1;
1357
1338
}
1358
1339
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1341
int ret;
1362
1342
struct timespec now;
1363
1343
struct timespec waited_time;
1364
1344
intmax_t block_time;
1365
1345
1366
1346
while(true){
1367
if(mc->current_server == NULL){
1347
if(mc.current_server == NULL){
1368
1348
if (debug){
1369
fprintf_plus(stderr, "Wait until first server is found."
1370
" No timeout!\n");
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1371
1351
}
1372
1352
ret = avahi_simple_poll_iterate(s, -1);
1373
1353
} else {
1374
1354
if (debug){
1375
fprintf_plus(stderr, "Check current_server if we should run"
1376
" it, or wait\n");
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1377
1358
}
1378
1359
/* the current time */
1379
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1384
1365
/* Calculating in ms how long time between now and server
1385
1366
who we visted longest time ago. Now - last seen. */
1386
1367
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1368
- mc.current_server->last_seen.tv_sec);
1388
1369
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1370
- mc.current_server->last_seen.tv_nsec);
1390
1371
/* total time is 10s/10,000ms.
1391
1372
Converting to s from ms by dividing by 1,000,
1392
1373
and ns to ms by dividing by 1,000,000. */
1395
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1377
1397
1378
if (debug){
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
block_time);
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1400
1381
}
1401
1382
1402
1383
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
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);
1407
1388
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1389
avahi_simple_poll_quit(mc.simple_poll);
1409
1390
return 0;
1410
1391
}
1411
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1393
&mc.current_server->last_seen);
1413
1394
if(ret == -1){
1414
1395
perror_plus("clock_gettime");
1415
1396
return -1;
1416
1397
}
1417
mc->current_server = mc->current_server->next;
1398
mc.current_server = mc.current_server->next;
1418
1399
block_time = 0; /* Call avahi to find new Mandos
1419
1400
servers, but don't block */
1420
1401
}
1429
1410
}
1430
1411
}
1431
1412
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1485
const float delay){
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1507
perror_plus("asprintf");
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1566
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1578
} else {
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
1615
}
1616
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
1413
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
1414
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1415
int error;
1796
1416
int ret;
1797
1417
intmax_t tmpmax;
1798
1418
char *tmp;
1799
1419
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1420
const char *interface = "";
1421
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
1424
uid_t uid;
1425
gid_t gid;
1802
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1427
bool tempdir_created = false;
1804
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1429
const char *seckey = PATHDIR "/" SECKEY;
1806
1430
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1431
1810
1432
bool gnutls_initialized = false;
1811
1433
bool gpgme_initialized = false;
1873
1495
.group = 2 },
1874
1496
{ .name = "retry", .key = 132,
1875
1497
.arg = "SECONDS",
1876
.doc = "Retry interval used when denied by the Mandos server",
1498
.doc = "Retry interval used when denied by the mandos server",
1877
1499
.group = 2 },
1878
1500
{ .name = "network-hook-dir", .key = 133,
1879
1501
.arg = "DIR",
1902
1524
connect_to = arg;
1903
1525
break;
1904
1526
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1527
interface = arg;
1910
1528
break;
1911
1529
case 's': /* --seckey */
1912
1530
seckey = arg;
1955
1573
argp_state_help(state, state->out_stream,
1956
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1957
1575
case 'V': /* --version */
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1959
1578
exit(argp_err_exit_status);
1960
1579
break;
1961
1580
default:
1988
1607
{
1989
1608
/* Work around Debian bug #633582:
1990
1609
<http://bugs.debian.org/633582> */
1610
struct stat st;
1991
1611
1992
1612
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1994
struct stat st;
1995
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1997
int seckey_fd = open(seckey, O_RDONLY);
1998
if(seckey_fd == -1){
1999
perror_plus("open");
2000
} else {
2001
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2002
if(ret == -1){
2003
perror_plus("fstat");
2004
} else {
2005
if(S_ISREG(st.st_mode)
2006
and st.st_uid == 0 and st.st_gid == 0){
2007
ret = fchown(seckey_fd, uid, gid);
2008
if(ret == -1){
2009
perror_plus("fchown");
2010
}
2011
}
2012
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2014
}
2015
}
2016
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2019
if(pubkey_fd == -1){
2020
perror_plus("open");
2021
} else {
2022
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2023
if(ret == -1){
2024
perror_plus("fstat");
2025
} else {
2026
if(S_ISREG(st.st_mode)
2027
and st.st_uid == 0 and st.st_gid == 0){
2028
ret = fchown(pubkey_fd, uid, gid);
2029
if(ret == -1){
2030
perror_plus("fchown");
2031
}
2032
}
2033
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2038
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
2056
}
2057
}
2058
}
2059
2060
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
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)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
1675
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
2076
1758
}
2077
1759
}
2078
1760
2080
1762
avahi_set_log_function(empty_log);
2081
1763
}
2082
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
2083
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1800
from the signal handler */
2085
1801
/* Initialize the pseudo-RNG for Avahi */
2086
1802
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
2089
fprintf_plus(stderr,
2090
"Avahi: Failed to create simple poll object.\n");
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
2091
1807
exitcode = EX_UNAVAILABLE;
2092
1808
goto end;
2093
1809
}
2155
1871
}
2156
1872
}
2157
1873
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;
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1895
#ifdef __linux__
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1900
if(ret == -1){
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1903
}
1904
#endif /* __linux__ */
1905
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1910
#ifdef __linux__
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1913
if(ret == -1){
1914
perror_plus("klogctl");
1915
}
1916
}
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1930
#ifdef __linux__
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1933
if(ret == -1){
1934
perror_plus("klogctl");
1935
}
1936
}
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1945
goto end;
1946
}
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1955
#ifdef __linux__
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1958
if(ret == -1){
1959
perror_plus("klogctl");
2204
1960
}
2205
1961
}
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
goto end;
1970
}
1971
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
2206
1979
break;
2207
1980
}
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);
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1985
}
1986
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
}
1994
#ifdef __linux__
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1998
if(ret == -1){
1999
perror_plus("klogctl");
2000
}
2001
}
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
} else {
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2233
2018
}
2234
2019
2235
2020
if(quit_now){
2236
2021
goto end;
2237
2022
}
2238
2023
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
2024
ret = init_gnutls_global(pubkey, seckey);
2240
2025
if(ret == -1){
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2242
2028
exitcode = EX_UNAVAILABLE;
2243
2029
goto end;
2244
2030
} else {
2259
2045
goto end;
2260
2046
}
2261
2047
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2263
fprintf_plus(stderr, "init_gpgme failed\n");
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2264
2051
exitcode = EX_UNAVAILABLE;
2265
2052
goto end;
2266
2053
} else {
2275
2062
/* Connect directly, do not use Zeroconf */
2276
2063
/* (Mainly meant for debugging) */
2277
2064
char *address = strrchr(connect_to, ':');
2278
2279
2065
if(address == NULL){
2280
fprintf_plus(stderr, "No colon in address\n");
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2281
2068
exitcode = EX_USAGE;
2282
2069
goto end;
2283
2070
}
2286
2073
goto end;
2287
2074
}
2288
2075
2289
in_port_t port;
2076
uint16_t port;
2290
2077
errno = 0;
2291
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2292
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2294
fprintf_plus(stderr, "Bad port number\n");
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2295
2083
exitcode = EX_USAGE;
2296
2084
goto end;
2297
2085
}
2298
2086
2299
2087
if(quit_now){
2300
2088
goto end;
2301
2089
}
2302
2090
2303
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2304
2092
*address = '\0';
2305
2093
/* Colon in address indicates IPv6 */
2306
2094
int af;
2322
2110
}
2323
2111
2324
2112
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2327
2114
if(quit_now or ret == 0){
2328
2115
break;
2329
2116
}
2330
2117
if(debug){
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
(int)retry_interval);
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2333
2120
}
2334
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2335
2122
}
2336
2123
2337
2124
if (not quit_now){
2355
2142
config.publish_domain = 0;
2356
2143
2357
2144
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2360
2148
2361
2149
/* Free the Avahi configuration data */
2362
2150
avahi_server_config_free(&config);
2364
2152
2365
2153
/* Check if creating the Avahi server object succeeded */
2366
2154
if(mc.server == NULL){
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
2157
avahi_strerror(error));
2369
2158
exitcode = EX_UNAVAILABLE;
2370
2159
goto end;
2371
2160
}
2377
2166
/* Create the Avahi service browser */
2378
2167
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
2168
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
2169
NULL, 0, browse_callback, NULL);
2382
2170
if(sb == NULL){
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
avahi_strerror(avahi_server_errno(mc.server)));
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2385
2174
exitcode = EX_UNAVAILABLE;
2386
2175
goto end;
2387
2176
}
2393
2182
/* Run the main loop */
2394
2183
2395
2184
if(debug){
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2397
2187
}
2398
2188
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2401
2191
if(debug){
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
(ret == 0) ? "successfully" : "with error");
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2404
2195
}
2405
2196
2406
2197
end:
2407
2198
2408
2199
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2410
2202
}
2411
2203
2412
2204
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
2205
if(sb != NULL)
2416
2206
avahi_s_service_browser_free(sb);
2417
2207
2418
2208
if(mc.server != NULL)
2419
2209
avahi_server_free(mc.server);
2420
2210
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2423
2213
2424
2214
if(gnutls_initialized){
2425
2215
gnutls_certificate_free_credentials(mc.cred);
2430
2220
if(gpgme_initialized){
2431
2221
gpgme_release(mc.ctx);
2432
2222
}
2433
2223
2434
2224
/* Cleans up the circular linked list of Mandos servers the client
2435
2225
has seen */
2436
2226
if(mc.current_server != NULL){
2442
2232
}
2443
2233
}
2444
2234
2445
/* Re-raise priviliges */
2446
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2244
}
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2463
2254
}
2464
2255
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2468
2265
}
2469
2266
}
2470
2471
lower_privileges_permanently();
2472
2267
}
2473
2268
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2476
2477
2269
/* Removes the GPGME temp directory and all files inside */
2478
2270
if(tempdir_created){
2479
2271
struct dirent **direntries = NULL;
2492
2284
}
2493
2285
ret = remove(fullname);
2494
2286
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2497
2289
}
2498
2290
free(fullname);
2499
2291
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0