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237.7.151
(compared to revision 237.16.7)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-16 23:39:10 UTC
- mto: (301.1.1 release) (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120616233910-jxxxriq608qa6o8z
* plugins.d/mandos-client (mandos_context): New "interfaces" and
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
"interfaces_size" members.
(main): Removed "interfaces" and "interfaces_size" variabled; all
users changed.
- 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
ret = init_gnutls_session(&session, mc);
668
663
if(ret != 0){
669
664
return -1;
670
665
}
671
666
672
667
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
668
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
669
PRIuMAX "\n", ip, (uintmax_t)port);
676
670
}
677
671
678
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
704
698
}
705
699
if(ret == 0){
706
700
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
701
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
702
errno = e;
710
703
goto mandos_end;
711
704
}
712
705
if(af == AF_INET6){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
706
to.in6.sin6_port = htons(port);
717
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
709
-Wunreachable-code*/
720
710
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");
711
fprintf_plus(stderr, "An IPv6 link-local address is"
712
" incomplete without a network interface\n");
724
713
errno = EINVAL;
725
714
goto mandos_end;
726
715
}
744
733
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
734
perror_plus("if_indextoname");
746
735
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
737
"\n", ip, interface, (uintmax_t)port);
750
738
}
751
739
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
740
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
741
ip, (uintmax_t)port);
754
742
}
755
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
766
754
perror_plus("inet_ntop");
767
755
} else {
768
756
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
771
758
}
772
759
}
773
760
}
827
814
}
828
815
829
816
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
817
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
818
}
833
819
834
820
if(quit_now){
836
822
goto mandos_end;
837
823
}
838
824
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
825
/* This casting via intptr_t is to eliminate warning about casting
826
an int to a pointer type. This is exactly how the GnuTLS Guile
827
function "set-session-transport-fd!" does it. */
828
gnutls_transport_set_ptr(session,
829
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
841
830
842
831
if(quit_now){
843
832
errno = EINTR;
854
843
855
844
if(ret != GNUTLS_E_SUCCESS){
856
845
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
846
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
847
gnutls_perror(ret);
860
848
}
861
849
errno = EPROTO;
865
853
/* Read OpenPGP packet that contains the wanted password */
866
854
867
855
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
856
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
857
" %s\n", ip);
870
858
}
871
859
872
860
while(true){
910
898
}
911
899
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
900
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
902
"***\n");
915
903
gnutls_perror(ret);
916
904
errno = EPROTO;
917
905
goto mandos_end;
918
906
}
919
907
break;
920
908
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
909
fprintf_plus(stderr, "Unknown error while reading data from"
910
" encrypted session with Mandos server\n");
924
911
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
912
errno = EIO;
926
913
goto mandos_end;
931
918
}
932
919
933
920
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
921
fprintf_plus(stderr, "Closing TLS session\n");
936
922
}
937
923
938
924
if(quit_now){
951
937
if(buffer_length > 0){
952
938
ssize_t decrypted_buffer_size;
953
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
940
&decrypted_buffer, mc);
955
941
if(decrypted_buffer_size >= 0){
956
942
957
943
written = 0;
967
953
if(ret == 0 and ferror(stdout)){
968
954
int e = errno;
969
955
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
956
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
957
strerror(errno));
973
958
}
974
959
errno = e;
975
960
goto mandos_end;
1019
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1006
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1007
void* mc){
1008
if(r == NULL){
1009
return;
1010
}
1024
1011
1025
1012
/* Called whenever a service has been resolved successfully or
1026
1013
timed out */
1032
1019
switch(event){
1033
1020
default:
1034
1021
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)));
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1024
domain,
1025
avahi_strerror(avahi_server_errno
1026
(((mandos_context*)mc)->server)));
1039
1027
break;
1040
1028
1041
1029
case AVAHI_RESOLVER_FOUND:
1043
1031
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1032
avahi_address_snprint(ip, sizeof(ip), address);
1045
1033
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);
1034
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1035
PRIdMAX ") on port %" PRIu16 "\n", name,
1036
host_name, ip, (intmax_t)interface, port);
1050
1037
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1038
int ret = start_mandos_communication(ip, (in_port_t)port,
1039
interface,
1040
avahi_proto_to_af(proto),
1041
mc);
1053
1042
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1043
avahi_simple_poll_quit(simple_poll);
1055
1044
} else {
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1045
if(not add_server(ip, (in_port_t)port, interface,
1046
avahi_proto_to_af(proto),
1047
&((mandos_context*)mc)->current_server)){
1048
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1049
" list\n", name);
1050
}
1058
1051
}
1059
1052
}
1060
1053
}
1070
1063
const char *domain,
1071
1064
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1065
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1066
void* mc){
1067
if(b == NULL){
1068
return;
1069
}
1075
1070
1076
1071
/* Called whenever a new services becomes available on the LAN or
1077
1072
is removed from the LAN */
1084
1079
default:
1085
1080
case AVAHI_BROWSER_FAILURE:
1086
1081
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);
1082
fprintf_plus(stderr, "(Avahi browser) %s\n",
1083
avahi_strerror(avahi_server_errno
1084
(((mandos_context*)mc)->server)));
1085
avahi_simple_poll_quit(simple_poll);
1091
1086
return;
1092
1087
1093
1088
case AVAHI_BROWSER_NEW:
1096
1091
the callback function is called the Avahi server will free the
1097
1092
resolver for us. */
1098
1093
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)));
1094
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1095
interface, protocol, name, type,
1096
domain, protocol, 0,
1097
resolve_callback, mc) == NULL)
1098
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1099
" %s\n", name,
1100
avahi_strerror(avahi_server_errno
1101
(((mandos_context*)mc)->server)));
1105
1102
break;
1106
1103
1107
1104
case AVAHI_BROWSER_REMOVE:
1110
1107
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1108
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1109
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1110
fprintf_plus(stderr, "No Mandos server found, still"
1111
" searching...\n");
1115
1112
}
1116
1113
break;
1117
1114
}
1126
1123
signal_received = sig;
1127
1124
int old_errno = errno;
1128
1125
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1126
if(simple_poll != NULL){
1127
avahi_simple_poll_quit(simple_poll);
1131
1128
}
1132
1129
errno = old_errno;
1133
1130
}
1134
1131
1135
1132
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1133
int ret;
1134
error_t ret_errno;
1137
1135
1138
1136
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1137
if(s < 0){
1138
ret_errno = errno;
1140
1139
perror_plus("socket");
1140
errno = ret_errno;
1141
1141
return false;
1142
1142
}
1143
1143
strcpy(ifr->ifr_name, ifname);
1144
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1145
if(ret == -1){
1146
1146
if(debug){
1147
ret_errno = errno;
1147
1148
perror_plus("ioctl SIOCGIFFLAGS");
1149
errno = ret_errno;
1148
1150
}
1149
1151
return false;
1150
1152
}
1156
1158
/* Reject the loopback device */
1157
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1160
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1161
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1162
ifname);
1161
1163
}
1162
1164
return false;
1163
1165
}
1164
1166
/* Accept point-to-point devices only if connect_to is specified */
1165
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1168
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1169
fprintf_plus(stderr, "Accepting point-to-point interface"
1170
" \"%s\"\n", ifname);
1169
1171
}
1170
1172
return true;
1171
1173
}
1172
1174
/* Otherwise, reject non-broadcast-capable devices */
1173
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1176
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1177
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1178
" \"%s\"\n", ifname);
1177
1179
}
1178
1180
return false;
1179
1181
}
1180
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1183
if(ifr->ifr_flags & IFF_NOARP){
1182
1184
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1185
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1186
ifname);
1185
1187
}
1186
1188
return false;
1187
1189
}
1188
1190
1189
1191
/* Accept this device */
1190
1192
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1193
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1194
}
1194
1195
return true;
1195
1196
}
1207
1208
struct ifreq ifr;
1208
1209
if(not get_flags(if_entry->d_name, &ifr)){
1209
1210
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;
1211
fprintf_plus(stderr, "Failed to get flags for interface "
1212
"\"%s\"\n", 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 network interface is up.
1225
*/
1226
bool interface_is_up(const char *interface){
1227
struct ifreq ifr;
1228
if(not get_flags(interface, &ifr)){
1229
if(debug){
1230
fprintf_plus(stderr, "Failed to get flags for interface "
1231
"\"%s\"\n", interface);
1232
}
1233
return false;
1234
}
1235
1236
return (bool)(ifr.ifr_flags & IFF_UP);
1237
}
1238
1239
/*
1240
* This function determines if a network interface is running
1241
*/
1242
bool interface_is_running(const char *interface){
1243
struct ifreq ifr;
1244
if(not get_flags(interface, &ifr)){
1245
if(debug){
1246
fprintf_plus(stderr, "Failed to get flags for interface "
1247
"\"%s\"\n", interface);
1248
}
1249
return false;
1250
}
1251
1252
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1267
1253
}
1268
1254
1269
1255
int notdotentries(const struct dirent *direntry){
1295
1281
if((direntry->d_name)[sret] != '\0'){
1296
1282
/* Contains non-allowed characters */
1297
1283
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1284
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1285
direntry->d_name);
1301
1286
}
1302
1287
return 0;
1303
1288
}
1319
1304
if(not (S_ISREG(st.st_mode))){
1320
1305
/* Not a regular file */
1321
1306
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1307
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1308
direntry->d_name);
1325
1309
}
1326
1310
return 0;
1327
1311
}
1328
1312
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1313
/* Not executable */
1330
1314
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1315
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1316
direntry->d_name);
1334
1317
}
1335
1318
return 0;
1336
1319
}
1320
if(debug){
1321
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1322
direntry->d_name);
1323
}
1337
1324
return 1;
1338
1325
}
1339
1326
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1327
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1328
mandos_context *mc){
1341
1329
int ret;
1342
1330
struct timespec now;
1343
1331
struct timespec waited_time;
1344
1332
intmax_t block_time;
1345
1333
1346
1334
while(true){
1347
if(mc.current_server == NULL){
1335
if(mc->current_server == NULL){
1348
1336
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1337
fprintf_plus(stderr, "Wait until first server is found."
1338
" No timeout!\n");
1351
1339
}
1352
1340
ret = avahi_simple_poll_iterate(s, -1);
1353
1341
} else {
1354
1342
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1343
fprintf_plus(stderr, "Check current_server if we should run"
1344
" it, or wait\n");
1358
1345
}
1359
1346
/* the current time */
1360
1347
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1352
/* Calculating in ms how long time between now and server
1366
1353
who we visted longest time ago. Now - last seen. */
1367
1354
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1355
- mc->current_server->last_seen.tv_sec);
1369
1356
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1357
- mc->current_server->last_seen.tv_nsec);
1371
1358
/* total time is 10s/10,000ms.
1372
1359
Converting to s from ms by dividing by 1,000,
1373
1360
and ns to ms by dividing by 1,000,000. */
1376
1363
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1364
1378
1365
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1366
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1367
block_time);
1381
1368
}
1382
1369
1383
1370
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);
1371
ret = start_mandos_communication(mc->current_server->ip,
1372
mc->current_server->port,
1373
mc->current_server->if_index,
1374
mc->current_server->af, mc);
1388
1375
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1376
avahi_simple_poll_quit(s);
1390
1377
return 0;
1391
1378
}
1392
1379
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1380
&mc->current_server->last_seen);
1394
1381
if(ret == -1){
1395
1382
perror_plus("clock_gettime");
1396
1383
return -1;
1397
1384
}
1398
mc.current_server = mc.current_server->next;
1385
mc->current_server = mc->current_server->next;
1399
1386
block_time = 0; /* Call avahi to find new Mandos
1400
1387
servers, but don't block */
1401
1388
}
1410
1397
}
1411
1398
}
1412
1399
1400
/* Set effective uid to 0, return errno */
1401
error_t raise_privileges(void){
1402
error_t old_errno = errno;
1403
error_t ret_errno = 0;
1404
if(seteuid(0) == -1){
1405
ret_errno = errno;
1406
perror_plus("seteuid");
1407
}
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
1412
/* Set effective and real user ID to 0. Return errno. */
1413
error_t raise_privileges_permanently(void){
1414
error_t old_errno = errno;
1415
error_t ret_errno = raise_privileges();
1416
if(ret_errno != 0){
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
if(setuid(0) == -1){
1421
ret_errno = errno;
1422
perror_plus("seteuid");
1423
}
1424
errno = old_errno;
1425
return ret_errno;
1426
}
1427
1428
/* Set effective user ID to unprivileged saved user ID */
1429
error_t lower_privileges(void){
1430
error_t old_errno = errno;
1431
error_t ret_errno = 0;
1432
if(seteuid(uid) == -1){
1433
ret_errno = errno;
1434
perror_plus("seteuid");
1435
}
1436
errno = old_errno;
1437
return ret_errno;
1438
}
1439
1440
/* Lower privileges permanently */
1441
error_t lower_privileges_permanently(void){
1442
error_t old_errno = errno;
1443
error_t ret_errno = 0;
1444
if(setuid(uid) == -1){
1445
ret_errno = errno;
1446
perror_plus("setuid");
1447
}
1448
errno = old_errno;
1449
return ret_errno;
1450
}
1451
1452
bool run_network_hooks(const char *mode, const char *interface,
1453
const float delay){
1454
struct dirent **direntries;
1455
struct dirent *direntry;
1456
int ret;
1457
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1458
alphasort);
1459
if(numhooks == -1){
1460
if(errno == ENOENT){
1461
if(debug){
1462
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1463
" found\n", hookdir);
1464
}
1465
} else {
1466
perror_plus("scandir");
1467
}
1468
} else {
1469
int devnull = open("/dev/null", O_RDONLY);
1470
for(int i = 0; i < numhooks; i++){
1471
direntry = direntries[i];
1472
char *fullname = NULL;
1473
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1474
if(ret < 0){
1475
perror_plus("asprintf");
1476
continue;
1477
}
1478
if(debug){
1479
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1480
direntry->d_name);
1481
}
1482
pid_t hook_pid = fork();
1483
if(hook_pid == 0){
1484
/* Child */
1485
/* Raise privileges */
1486
raise_privileges_permanently();
1487
/* Set group */
1488
errno = 0;
1489
ret = setgid(0);
1490
if(ret == -1){
1491
perror_plus("setgid");
1492
}
1493
/* Reset supplementary groups */
1494
errno = 0;
1495
ret = setgroups(0, NULL);
1496
if(ret == -1){
1497
perror_plus("setgroups");
1498
}
1499
dup2(devnull, STDIN_FILENO);
1500
close(devnull);
1501
dup2(STDERR_FILENO, STDOUT_FILENO);
1502
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1503
if(ret == -1){
1504
perror_plus("setenv");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DEVICE", interface, 1);
1508
if(ret == -1){
1509
perror_plus("setenv");
1510
_exit(EX_OSERR);
1511
}
1512
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1513
if(ret == -1){
1514
perror_plus("setenv");
1515
_exit(EX_OSERR);
1516
}
1517
ret = setenv("MODE", mode, 1);
1518
if(ret == -1){
1519
perror_plus("setenv");
1520
_exit(EX_OSERR);
1521
}
1522
char *delaystring;
1523
ret = asprintf(&delaystring, "%f", delay);
1524
if(ret == -1){
1525
perror_plus("asprintf");
1526
_exit(EX_OSERR);
1527
}
1528
ret = setenv("DELAY", delaystring, 1);
1529
if(ret == -1){
1530
free(delaystring);
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
free(delaystring);
1535
if(connect_to != NULL){
1536
ret = setenv("CONNECT", connect_to, 1);
1537
if(ret == -1){
1538
perror_plus("setenv");
1539
_exit(EX_OSERR);
1540
}
1541
}
1542
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1543
perror_plus("execl");
1544
_exit(EXIT_FAILURE);
1545
}
1546
} else {
1547
int status;
1548
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1549
perror_plus("waitpid");
1550
free(fullname);
1551
continue;
1552
}
1553
if(WIFEXITED(status)){
1554
if(WEXITSTATUS(status) != 0){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1556
" with status %d\n", direntry->d_name,
1557
WEXITSTATUS(status));
1558
free(fullname);
1559
continue;
1560
}
1561
} else if(WIFSIGNALED(status)){
1562
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1563
" signal %d\n", direntry->d_name,
1564
WTERMSIG(status));
1565
free(fullname);
1566
continue;
1567
} else {
1568
fprintf_plus(stderr, "Warning: network hook \"%s\""
1569
" crashed\n", direntry->d_name);
1570
free(fullname);
1571
continue;
1572
}
1573
}
1574
free(fullname);
1575
if(debug){
1576
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1577
direntry->d_name);
1578
}
1579
}
1580
close(devnull);
1581
}
1582
return true;
1583
}
1584
1585
error_t bring_up_interface(const char *const interface,
1586
const float delay){
1587
int sd = -1;
1588
error_t old_errno = errno;
1589
error_t ret_errno = 0;
1590
int ret, ret_setflags;
1591
struct ifreq network;
1592
unsigned int if_index = if_nametoindex(interface);
1593
if(if_index == 0){
1594
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1595
errno = old_errno;
1596
return ENXIO;
1597
}
1598
1599
if(quit_now){
1600
errno = old_errno;
1601
return EINTR;
1602
}
1603
1604
if(not interface_is_up(interface)){
1605
if(not get_flags(interface, &network) and debug){
1606
ret_errno = errno;
1607
fprintf_plus(stderr, "Failed to get flags for interface "
1608
"\"%s\"\n", interface);
1609
return ret_errno;
1610
}
1611
network.ifr_flags |= IFF_UP;
1612
1613
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1614
if(sd < 0){
1615
ret_errno = errno;
1616
perror_plus("socket");
1617
errno = old_errno;
1618
return ret_errno;
1619
}
1620
1621
if(quit_now){
1622
close(sd);
1623
errno = old_errno;
1624
return EINTR;
1625
}
1626
1627
if(debug){
1628
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1629
interface);
1630
}
1631
1632
/* Raise priviliges */
1633
raise_privileges();
1634
1635
#ifdef __linux__
1636
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1637
messages about the network interface to mess up the prompt */
1638
int ret_linux = klogctl(8, NULL, 5);
1639
bool restore_loglevel = true;
1640
if(ret_linux == -1){
1641
restore_loglevel = false;
1642
perror_plus("klogctl");
1643
}
1644
#endif /* __linux__ */
1645
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1646
ret_errno = errno;
1647
#ifdef __linux__
1648
if(restore_loglevel){
1649
ret_linux = klogctl(7, NULL, 0);
1650
if(ret_linux == -1){
1651
perror_plus("klogctl");
1652
}
1653
}
1654
#endif /* __linux__ */
1655
1656
/* Lower privileges */
1657
lower_privileges();
1658
1659
/* Close the socket */
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
if(ret == -1){
1662
perror_plus("close");
1663
}
1664
1665
if(ret_setflags == -1){
1666
errno = ret_errno;
1667
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1668
errno = old_errno;
1669
return ret_errno;
1670
}
1671
} else if(debug){
1672
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1673
interface);
1674
}
1675
1676
/* Sleep checking until interface is running.
1677
Check every 0.25s, up to total time of delay */
1678
for(int i=0; i < delay * 4; i++){
1679
if(interface_is_running(interface)){
1680
break;
1681
}
1682
struct timespec sleeptime = { .tv_nsec = 250000000 };
1683
ret = nanosleep(&sleeptime, NULL);
1684
if(ret == -1 and errno != EINTR){
1685
perror_plus("nanosleep");
1686
}
1687
}
1688
1689
errno = old_errno;
1690
return 0;
1691
}
1692
1693
error_t take_down_interface(const char *const interface){
1694
int sd = -1;
1695
error_t old_errno = errno;
1696
error_t ret_errno = 0;
1697
int ret, ret_setflags;
1698
struct ifreq network;
1699
unsigned int if_index = if_nametoindex(interface);
1700
if(if_index == 0){
1701
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1702
errno = old_errno;
1703
return ENXIO;
1704
}
1705
if(interface_is_up(interface)){
1706
if(not get_flags(interface, &network) and debug){
1707
ret_errno = errno;
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", interface);
1710
return ret_errno;
1711
}
1712
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1713
1714
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1715
if(sd < 0){
1716
ret_errno = errno;
1717
perror_plus("socket");
1718
errno = old_errno;
1719
return ret_errno;
1720
}
1721
1722
if(debug){
1723
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1724
interface);
1725
}
1726
1727
/* Raise priviliges */
1728
raise_privileges();
1729
1730
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
ret_errno = errno;
1732
1733
/* Lower privileges */
1734
lower_privileges();
1735
1736
/* Close the socket */
1737
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1738
if(ret == -1){
1739
perror_plus("close");
1740
}
1741
1742
if(ret_setflags == -1){
1743
errno = ret_errno;
1744
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1745
errno = old_errno;
1746
return ret_errno;
1747
}
1748
} else if(debug){
1749
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1750
interface);
1751
}
1752
1753
errno = old_errno;
1754
return 0;
1755
}
1756
1413
1757
int main(int argc, char *argv[]){
1758
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1759
.priority = "SECURE256:!CTYPE-X.509:"
1760
"+CTYPE-OPENPGP", .current_server = NULL,
1761
.interfaces = NULL, .interfaces_size = 0 };
1414
1762
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1763
error_t ret_errno;
1416
1764
int ret;
1417
1765
intmax_t tmpmax;
1418
1766
char *tmp;
1419
1767
int exitcode = EXIT_SUCCESS;
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;
1768
char *interfaces_to_take_down = NULL;
1769
size_t interfaces_to_take_down_size = 0;
1426
1770
char tempdir[] = "/tmp/mandosXXXXXX";
1427
1771
bool tempdir_created = false;
1428
1772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1773
const char *seckey = PATHDIR "/" SECKEY;
1430
1774
const char *pubkey = PATHDIR "/" PUBKEY;
1775
char *interfaces_hooks = NULL;
1776
size_t interfaces_hooks_size = 0;
1431
1777
1432
1778
bool gnutls_initialized = false;
1433
1779
bool gpgme_initialized = false;
1495
1841
.group = 2 },
1496
1842
{ .name = "retry", .key = 132,
1497
1843
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1844
.doc = "Retry interval used when denied by the Mandos server",
1499
1845
.group = 2 },
1500
1846
{ .name = "network-hook-dir", .key = 133,
1501
1847
.arg = "DIR",
1524
1870
connect_to = arg;
1525
1871
break;
1526
1872
case 'i': /* --interface */
1527
interface = arg;
1873
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1874
arg, (int)',');
1875
if(ret_errno != 0){
1876
argp_error(state, "%s", strerror(ret_errno));
1877
}
1528
1878
break;
1529
1879
case 's': /* --seckey */
1530
1880
seckey = arg;
1573
1923
argp_state_help(state, state->out_stream,
1574
1924
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
1925
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
1926
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
1927
exit(argp_err_exit_status);
1579
1928
break;
1580
1929
default:
1607
1956
{
1608
1957
/* Work around Debian bug #633582:
1609
1958
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1959
1612
1960
/* Re-raise priviliges */
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("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1961
if(raise_privileges() == 0){
1962
struct stat st;
1963
1964
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1965
int seckey_fd = open(seckey, O_RDONLY);
1966
if(seckey_fd == -1){
1967
perror_plus("open");
1968
} else {
1969
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1970
if(ret == -1){
1971
perror_plus("fstat");
1972
} else {
1973
if(S_ISREG(st.st_mode)
1974
and st.st_uid == 0 and st.st_gid == 0){
1975
ret = fchown(seckey_fd, uid, gid);
1976
if(ret == -1){
1977
perror_plus("fchown");
1978
}
1979
}
1980
}
1981
TEMP_FAILURE_RETRY(close(seckey_fd));
1982
}
1983
}
1984
1985
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1986
int pubkey_fd = open(pubkey, O_RDONLY);
1987
if(pubkey_fd == -1){
1988
perror_plus("open");
1989
} else {
1990
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1991
if(ret == -1){
1992
perror_plus("fstat");
1993
} else {
1994
if(S_ISREG(st.st_mode)
1995
and st.st_uid == 0 and st.st_gid == 0){
1996
ret = fchown(pubkey_fd, uid, gid);
1997
if(ret == -1){
1998
perror_plus("fchown");
1999
}
2000
}
2001
}
2002
TEMP_FAILURE_RETRY(close(pubkey_fd));
2003
}
2004
}
2005
2006
/* Lower privileges */
2007
errno = 0;
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2012
}
2013
}
2014
2015
/* Remove empty interface names */
2016
{
2017
char *interface = NULL;
2018
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2019
interface))){
2020
if(if_nametoindex(interface) == 0){
2021
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2022
fprintf_plus(stderr, "Not using nonexisting interface"
2023
" \"%s\"\n", interface);
2024
}
2025
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2026
interface = NULL;
2027
}
2028
}
2029
}
2030
2031
/* Run network hooks */
2032
{
2033
2034
if(mc.interfaces != NULL){
2035
interfaces_hooks = malloc(mc.interfaces_size);
2036
if(interfaces_hooks == NULL){
2037
perror_plus("malloc");
2038
goto end;
2039
}
2040
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2041
interfaces_hooks_size = mc.interfaces_size;
2042
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2043
(int)',');
2044
}
2045
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2046
interfaces_hooks : "", delay)){
2047
goto end;
1763
2048
}
1764
2049
}
1765
2050
1767
2052
avahi_set_log_function(empty_log);
1768
2053
}
1769
2054
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
2055
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2056
from the signal handler */
1806
2057
/* Initialize the pseudo-RNG for Avahi */
1807
2058
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2059
simple_poll = avahi_simple_poll_new();
2060
if(simple_poll == NULL){
2061
fprintf_plus(stderr,
2062
"Avahi: Failed to create simple poll object.\n");
1812
2063
exitcode = EX_UNAVAILABLE;
1813
2064
goto end;
1814
2065
}
1876
2127
}
1877
2128
}
1878
2129
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1886
goto end;
1887
}
1888
1889
if(quit_now){
1890
goto end;
1891
}
1892
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1900
#ifdef __linux__
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1905
if(ret == -1){
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1908
}
1909
#endif /* __linux__ */
1910
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
if(sd < 0){
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1915
#ifdef __linux__
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1918
if(ret == -1){
1919
perror_plus("klogctl");
1920
}
1921
}
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1929
goto end;
1930
}
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1935
#ifdef __linux__
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1938
if(ret == -1){
1939
perror_plus("klogctl");
1940
}
1941
}
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
if(ret == -1){
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1960
#ifdef __linux__
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1963
if(ret == -1){
1964
perror_plus("klogctl");
1965
}
1966
}
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1974
goto end;
1975
}
1976
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1984
break;
1985
}
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1990
}
1991
}
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
}
1999
#ifdef __linux__
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2003
if(ret == -1){
2004
perror_plus("klogctl");
2005
}
2006
}
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2130
/* If no interfaces were specified, make a list */
2131
if(mc.interfaces == NULL){
2132
struct dirent **direntries;
2133
/* Look for any good interfaces */
2134
ret = scandir(sys_class_net, &direntries, good_interface,
2135
alphasort);
2136
if(ret >= 1){
2137
/* Add all found interfaces to interfaces list */
2138
for(int i = 0; i < ret; ++i){
2139
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2140
direntries[i]->d_name);
2141
if(ret_errno != 0){
2142
perror_plus("argz_add");
2143
continue;
2144
}
2145
if(debug){
2146
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2147
direntries[i]->d_name);
2148
}
2149
}
2150
free(direntries);
2016
2151
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2152
free(direntries);
2153
fprintf_plus(stderr, "Could not find a network interface\n");
2154
exitcode = EXIT_FAILURE;
2155
goto end;
2156
}
2157
}
2158
2159
/* If we only got one interface, explicitly use only that one */
2160
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2161
if(debug){
2162
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2163
mc.interfaces);
2164
}
2165
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2166
}
2167
2168
/* Bring up interfaces which are down */
2169
if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1
2170
and strcmp(mc.interfaces, "none") == 0)){
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
bool interface_was_up = interface_is_up(interface);
2175
ret = bring_up_interface(interface, delay);
2176
if(not interface_was_up){
2177
if(ret != 0){
2178
errno = ret;
2179
perror_plus("Failed to bring up interface");
2180
} else {
2181
ret_errno = argz_add(&interfaces_to_take_down,
2182
&interfaces_to_take_down_size,
2183
interface);
2184
}
2021
2185
}
2022
2186
}
2187
free(mc.interfaces);
2188
mc.interfaces = NULL;
2189
mc.interfaces_size = 0;
2190
if(debug and (interfaces_to_take_down == NULL)){
2191
fprintf_plus(stderr, "No interfaces were brought up\n");
2192
}
2023
2193
}
2024
2194
2025
2195
if(quit_now){
2026
2196
goto end;
2027
2197
}
2028
2198
2029
ret = init_gnutls_global(pubkey, seckey);
2199
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2200
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2201
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2202
exitcode = EX_UNAVAILABLE;
2034
2203
goto end;
2035
2204
} else {
2050
2219
goto end;
2051
2220
}
2052
2221
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2222
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2223
fprintf_plus(stderr, "init_gpgme failed\n");
2056
2224
exitcode = EX_UNAVAILABLE;
2057
2225
goto end;
2058
2226
} else {
2067
2235
/* Connect directly, do not use Zeroconf */
2068
2236
/* (Mainly meant for debugging) */
2069
2237
char *address = strrchr(connect_to, ':');
2238
2070
2239
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2240
fprintf_plus(stderr, "No colon in address\n");
2073
2241
exitcode = EX_USAGE;
2074
2242
goto end;
2075
2243
}
2078
2246
goto end;
2079
2247
}
2080
2248
2081
uint16_t port;
2249
in_port_t port;
2082
2250
errno = 0;
2083
2251
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2252
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2253
or tmpmax != (in_port_t)tmpmax){
2254
fprintf_plus(stderr, "Bad port number\n");
2088
2255
exitcode = EX_USAGE;
2089
2256
goto end;
2090
2257
}
2093
2260
goto end;
2094
2261
}
2095
2262
2096
port = (uint16_t)tmpmax;
2263
port = (in_port_t)tmpmax;
2097
2264
*address = '\0';
2098
2265
/* Colon in address indicates IPv6 */
2099
2266
int af;
2115
2282
}
2116
2283
2117
2284
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2285
ret = start_mandos_communication(address, port, if_index, af,
2286
&mc);
2119
2287
if(quit_now or ret == 0){
2120
2288
break;
2121
2289
}
2122
2290
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2291
fprintf_plus(stderr, "Retrying in %d seconds\n",
2292
(int)retry_interval);
2125
2293
}
2126
2294
sleep((int)retry_interval);
2127
2295
}
2147
2315
config.publish_domain = 0;
2148
2316
2149
2317
/* Allocate a new server */
2150
mc.server = avahi_server_new(avahi_simple_poll_get
2151
(mc.simple_poll), &config, NULL,
2152
NULL, &error);
2318
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2319
&config, NULL, NULL, &ret_errno);
2153
2320
2154
2321
/* Free the Avahi configuration data */
2155
2322
avahi_server_config_free(&config);
2157
2324
2158
2325
/* Check if creating the Avahi server object succeeded */
2159
2326
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
2162
avahi_strerror(error));
2327
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2328
avahi_strerror(ret_errno));
2163
2329
exitcode = EX_UNAVAILABLE;
2164
2330
goto end;
2165
2331
}
2171
2337
/* Create the Avahi service browser */
2172
2338
sb = avahi_s_service_browser_new(mc.server, if_index,
2173
2339
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
NULL, 0, browse_callback, NULL);
2340
NULL, 0, browse_callback,
2341
(void *)&mc);
2175
2342
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
2178
avahi_strerror(avahi_server_errno(mc.server)));
2343
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2344
avahi_strerror(avahi_server_errno(mc.server)));
2179
2345
exitcode = EX_UNAVAILABLE;
2180
2346
goto end;
2181
2347
}
2187
2353
/* Run the main loop */
2188
2354
2189
2355
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2356
fprintf_plus(stderr, "Starting Avahi loop search\n");
2192
2357
}
2193
2358
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2359
ret = avahi_loop_with_timeout(simple_poll,
2360
(int)(retry_interval * 1000), &mc);
2196
2361
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2362
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2363
(ret == 0) ? "successfully" : "with error");
2200
2364
}
2201
2365
2202
2366
end:
2203
2367
2204
2368
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2369
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2207
2370
}
2208
2371
2209
2372
/* Cleanup things */
2213
2376
if(mc.server != NULL)
2214
2377
avahi_server_free(mc.server);
2215
2378
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2379
if(simple_poll != NULL)
2380
avahi_simple_poll_free(simple_poll);
2218
2381
2219
2382
if(gnutls_initialized){
2220
2383
gnutls_certificate_free_credentials(mc.cred);
2225
2388
if(gpgme_initialized){
2226
2389
gpgme_release(mc.ctx);
2227
2390
}
2228
2391
2229
2392
/* Cleans up the circular linked list of Mandos servers the client
2230
2393
has seen */
2231
2394
if(mc.current_server != NULL){
2237
2400
}
2238
2401
}
2239
2402
2240
/* XXX run network hooks "stop" here */
2241
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
2247
if(ret == -1){
2248
perror_plus("seteuid");
2249
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2403
/* Re-raise priviliges */
2404
{
2405
raise_privileges();
2406
2407
/* Run network hooks */
2408
run_network_hooks("stop", interfaces_hooks != NULL ?
2409
interfaces_hooks : "", delay);
2410
2411
/* Take down the network interfaces which were brought up */
2412
{
2413
char *interface = NULL;
2414
while((interface=argz_next(interfaces_to_take_down,
2415
interfaces_to_take_down_size,
2416
interface))){
2417
ret_errno = take_down_interface(interface);
2418
if(ret_errno != 0){
2419
errno = ret_errno;
2420
perror_plus("Failed to take down interface");
2259
2421
}
2260
2422
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2423
if(debug and (interfaces_to_take_down == NULL)){
2424
fprintf_plus(stderr, "No interfaces needed to be taken"
2425
" down\n");
2270
2426
}
2271
2427
}
2428
2429
lower_privileges_permanently();
2272
2430
}
2273
2431
2432
free(interfaces_to_take_down);
2433
free(interfaces_hooks);
2434
2274
2435
/* Removes the GPGME temp directory and all files inside */
2275
2436
if(tempdir_created){
2276
2437
struct dirent **direntries = NULL;
2289
2450
}
2290
2451
ret = remove(fullname);
2291
2452
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2453
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2454
strerror(errno));
2294
2455
}
2295
2456
free(fullname);
2296
2457
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0