To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 505.2.5
- compare with another revision
- download diff
- download tarball
- view history from revision 505.2.5
- Committer: Björn Påhlsson
- Date: 2011-11-14 18:32:54 UTC
- mfrom: (505.3.7 client-network-hooks)
- mto: (505.3.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: belorn@fukt.bsnet.se-20111114183254-ujkmu680jli1w3yd
merge
- files removed:
- debian/mandos-client.examples
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
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() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
90
99
91
#ifdef __linux__
100
92
#include <sys/klog.h> /* klogctl() */
142
134
static const char sys_class_net[] = "/sys/class/net";
143
135
char *connect_to = NULL;
144
136
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
137
149
138
/* Doubly linked list that need to be circularly linked when used */
150
139
typedef struct server{
151
140
const char *ip;
152
in_port_t port;
141
uint16_t port;
153
142
AvahiIfIndex if_index;
154
143
int af;
155
144
struct timespec last_seen;
159
148
160
149
/* Used for passing in values through the Avahi callback functions */
161
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
162
152
AvahiServer *server;
163
153
gnutls_certificate_credentials_t cred;
164
154
unsigned int dh_bits;
166
156
const char *priority;
167
157
gpgme_ctx_t ctx;
168
158
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
159
} mandos_context;
172
160
173
/* global so signal handler can reach it*/
174
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 };
175
166
176
167
sig_atomic_t quit_now = 0;
177
168
int signal_received = 0;
178
169
179
170
/* Function to use when printing errors */
180
171
void perror_plus(const char *print_text){
181
int e = errno;
182
172
fprintf(stderr, "Mandos plugin %s: ",
183
173
program_invocation_short_name);
184
errno = e;
185
174
perror(print_text);
186
175
}
187
176
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
177
int fprintf_plus(FILE *stream, const char *format, ...){
190
178
va_list ap;
191
179
va_start (ap, format);
192
180
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
183
}
197
184
198
185
/*
200
187
* bytes. "buffer_capacity" is how much is currently allocated,
201
188
* "buffer_length" is how much is already used.
202
189
*/
203
__attribute__((nonnull, warn_unused_result))
204
190
size_t incbuffer(char **buffer, size_t buffer_length,
205
191
size_t buffer_capacity){
206
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
194
if(buffer == NULL){
213
195
return 0;
214
196
}
215
*buffer = new_buf;
216
197
buffer_capacity += BUFFER_SIZE;
217
198
}
218
199
return buffer_capacity;
219
200
}
220
201
221
202
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
225
205
int ret;
226
206
server *new_server = malloc(sizeof(server));
227
207
if(new_server == NULL){
228
208
perror_plus("malloc");
229
return false;
209
return -1;
230
210
}
231
211
*new_server = (server){ .ip = strdup(ip),
232
212
.port = port,
234
214
.af = af };
235
215
if(new_server->ip == NULL){
236
216
perror_plus("strdup");
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
217
return -1;
243
218
}
244
219
/* Special case of first server */
245
if(*current_server == NULL){
220
if (mc.current_server == NULL){
246
221
new_server->next = new_server;
247
222
new_server->prev = new_server;
248
*current_server = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
249
225
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
253
228
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
257
237
}
258
238
259
239
/*
260
240
* Initialize GPGME.
261
241
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
267
244
gpgme_error_t rc;
268
245
gpgme_engine_info_t engine_info;
269
246
247
270
248
/*
271
249
* Helper function to insert pub and seckey to the engine keyring.
272
250
*/
273
bool import_key(const char * const filename){
251
bool import_key(const char *filename){
274
252
int ret;
275
253
int fd;
276
254
gpgme_data_t pgp_data;
283
261
284
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
263
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
288
267
return false;
289
268
}
290
269
291
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
292
271
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "Mandos plugin mandos-client: "
273
"bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
295
275
return false;
296
276
}
297
277
304
284
}
305
285
306
286
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"Initializing GPGME\n");
308
289
}
309
290
310
291
/* Init GPGME */
311
292
gpgme_check_version(NULL);
312
293
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
294
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
295
fprintf(stderr, "Mandos plugin mandos-client: "
296
"bad gpgme_engine_check_version: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
316
298
return false;
317
299
}
318
300
319
301
/* Set GPGME home directory for the OpenPGP engine only */
320
302
rc = gpgme_get_engine_info(&engine_info);
321
303
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
304
fprintf(stderr, "Mandos plugin mandos-client: "
305
"bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
324
307
return false;
325
308
}
326
309
while(engine_info != NULL){
332
315
engine_info = engine_info->next;
333
316
}
334
317
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"Could not set GPGME home dir to %s\n", tempdir);
337
320
return false;
338
321
}
339
322
340
323
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
342
325
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
326
fprintf(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
346
329
return false;
347
330
}
348
331
357
340
* Decrypt OpenPGP data.
358
341
* Returns -1 on error
359
342
*/
360
__attribute__((nonnull, warn_unused_result))
361
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
344
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
345
char **plaintext){
365
346
gpgme_data_t dh_crypto, dh_plain;
366
347
gpgme_error_t rc;
367
348
ssize_t ret;
369
350
ssize_t plaintext_length = 0;
370
351
371
352
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
373
355
}
374
356
375
357
/* Create new GPGME data buffer from memory cryptotext */
376
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
359
0);
378
360
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
381
364
return -1;
382
365
}
383
366
384
367
/* Create new empty GPGME data buffer for the plaintext */
385
368
rc = gpgme_data_new(&dh_plain);
386
369
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
390
373
gpgme_data_release(dh_crypto);
391
374
return -1;
392
375
}
393
376
394
377
/* Decrypt data from the cryptotext data buffer to the plaintext
395
378
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
380
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
400
384
plaintext_length = -1;
401
385
if(debug){
402
386
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
387
result = gpgme_op_decrypt_result(mc.ctx);
404
388
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
406
391
} else {
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
result->wrong_key_usage);
411
398
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
413
401
}
414
402
gpgme_recipient_t recipient;
415
403
recipient = result->recipients;
416
404
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
413
? "No" : "Yes");
424
414
recipient = recipient->next;
425
415
}
426
416
}
429
419
}
430
420
431
421
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
422
fprintf(stderr, "Mandos plugin mandos-client: "
423
"Decryption of OpenPGP data succeeded\n");
433
424
}
434
425
435
426
/* Seek back to the beginning of the GPGME plaintext data buffer */
466
457
}
467
458
468
459
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
460
fprintf(stderr, "Mandos plugin mandos-client: "
461
"Decrypted password is: ");
470
462
for(ssize_t i = 0; i < plaintext_length; i++){
471
463
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
464
}
483
475
return plaintext_length;
484
476
}
485
477
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
489
481
if(ret == NULL)
490
482
ret = "(unknown)";
491
483
return ret;
492
484
}
493
485
494
486
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
487
static void debuggnutls(__attribute__((unused)) int level,
497
488
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
499
490
}
500
491
501
__attribute__((nonnull, warn_unused_result))
502
492
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
493
const char *seckeyfilename){
505
494
int ret;
506
495
507
496
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
509
499
}
510
500
511
501
ret = gnutls_global_init();
512
502
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
515
505
return -1;
516
506
}
517
507
524
514
}
525
515
526
516
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
518
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
531
521
gnutls_global_deinit();
532
522
return -1;
533
523
}
534
524
535
525
if(debug){
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
529
seckeyfilename);
540
530
}
541
531
542
532
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
533
(mc.cred, pubkeyfilename, seckeyfilename,
544
534
GNUTLS_OPENPGP_FMT_BASE64);
545
535
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
536
fprintf(stderr,
537
"Mandos plugin mandos-client: "
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
551
542
goto globalfail;
552
543
}
553
544
554
545
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
546
ret = gnutls_dh_params_init(&mc.dh_params);
556
547
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
550
" %s\n", safer_gnutls_strerror(ret));
560
551
goto globalfail;
561
552
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
554
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
557
safer_gnutls_strerror(ret));
566
558
goto globalfail;
567
559
}
568
560
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
562
571
563
return 0;
572
564
573
565
globalfail:
574
566
575
gnutls_certificate_free_credentials(mc->cred);
567
gnutls_certificate_free_credentials(mc.cred);
576
568
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
569
gnutls_dh_params_deinit(mc.dh_params);
578
570
return -1;
579
571
}
580
572
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
573
static int init_gnutls_session(gnutls_session_t *session){
584
574
int ret;
585
575
/* GnuTLS session creation */
586
576
do {
590
580
}
591
581
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
582
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
583
fprintf(stderr, "Mandos plugin mandos-client: "
584
"Error in GnuTLS session initialization: %s\n",
585
safer_gnutls_strerror(ret));
596
586
}
597
587
598
588
{
599
589
const char *err;
600
590
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
591
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
592
if(quit_now){
603
593
gnutls_deinit(*session);
604
594
return -1;
605
595
}
606
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
597
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
598
fprintf(stderr, "Mandos plugin mandos-client: "
599
"Syntax error at: %s\n", err);
600
fprintf(stderr, "Mandos plugin mandos-client: "
601
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
611
602
gnutls_deinit(*session);
612
603
return -1;
613
604
}
615
606
616
607
do {
617
608
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
609
mc.cred);
619
610
if(quit_now){
620
611
gnutls_deinit(*session);
621
612
return -1;
622
613
}
623
614
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
615
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
616
fprintf(stderr, "Mandos plugin mandos-client: "
617
"Error setting GnuTLS credentials: %s\n",
618
safer_gnutls_strerror(ret));
627
619
gnutls_deinit(*session);
628
620
return -1;
629
621
}
631
623
/* ignore client certificate if any. */
632
624
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
625
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
626
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
627
636
628
return 0;
637
629
}
641
633
__attribute__((unused)) const char *txt){}
642
634
643
635
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
636
static int start_mandos_communication(const char *ip, uint16_t port,
646
637
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
638
int af){
648
639
int ret, tcp_sd = -1;
649
640
ssize_t sret;
650
struct sockaddr_storage to;
641
union {
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
644
} to;
651
645
char *buffer = NULL;
652
646
char *decrypted_buffer = NULL;
653
647
size_t buffer_length = 0;
672
666
pf = PF_INET;
673
667
break;
674
668
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
676
671
errno = EINVAL;
677
672
return -1;
678
673
}
679
674
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
675
ret = init_gnutls_session(&session);
713
676
if(ret != 0){
714
677
return -1;
715
678
}
716
679
717
680
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
683
"\n", ip, port);
720
684
}
721
685
722
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
734
698
735
699
memset(&to, 0, sizeof(to));
736
700
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
701
to.in6.sin6_family = (sa_family_t)af;
702
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
703
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
704
to.in.sin_family = (sa_family_t)af;
705
ret = inet_pton(af, ip, &to.in.sin_addr);
742
706
}
743
707
if(ret < 0 ){
744
708
int e = errno;
748
712
}
749
713
if(ret == 0){
750
714
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
715
fprintf(stderr, "Mandos plugin mandos-client: "
716
"Bad address: %s\n", ip);
752
717
errno = e;
753
718
goto mandos_end;
754
719
}
755
720
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
721
to.in6.sin6_port = htons(port); /* Spurious warnings from
722
-Wconversion and
723
-Wunreachable-code */
724
725
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
726
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
727
-Wunreachable-code*/
759
728
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
729
fprintf(stderr, "Mandos plugin mandos-client: "
730
"An IPv6 link-local address is incomplete"
731
" without a network interface\n");
762
732
errno = EINVAL;
763
733
goto mandos_end;
764
734
}
765
735
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
736
to.in6.sin6_scope_id = (uint32_t)if_index;
767
737
}
768
738
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
739
to.in.sin_port = htons(port); /* Spurious warnings from
740
-Wconversion and
741
-Wunreachable-code */
770
742
}
771
743
772
744
if(quit_now){
780
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
753
perror_plus("if_indextoname");
782
754
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
785
758
}
786
759
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
789
762
}
790
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
765
const char *pcret;
792
766
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
768
sizeof(addrstr));
797
769
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
771
sizeof(addrstr));
802
772
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
773
if(pcret == NULL){
774
perror_plus("inet_ntop");
775
} else {
776
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
779
}
809
780
}
810
781
}
811
782
815
786
}
816
787
817
788
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
790
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
792
}
824
793
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
795
int e = errno;
827
796
perror_plus("connect");
828
797
errno = e;
866
835
}
867
836
868
837
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
838
fprintf(stderr, "Mandos plugin mandos-client: "
839
"Establishing TLS session with %s\n", ip);
870
840
}
871
841
872
842
if(quit_now){
874
844
goto mandos_end;
875
845
}
876
846
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
847
/* Spurious warning from -Wint-to-pointer-cast */
848
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
849
883
850
if(quit_now){
884
851
errno = EINTR;
895
862
896
863
if(ret != GNUTLS_E_SUCCESS){
897
864
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
865
fprintf(stderr, "Mandos plugin mandos-client: "
866
"*** GnuTLS Handshake failed ***\n");
899
867
gnutls_perror(ret);
900
868
}
901
869
errno = EPROTO;
905
873
/* Read OpenPGP packet that contains the wanted password */
906
874
907
875
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
876
fprintf(stderr, "Mandos plugin mandos-client: "
877
"Retrieving OpenPGP encrypted password from %s\n", ip);
910
878
}
911
879
912
880
while(true){
950
918
}
951
919
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
920
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"*** GnuTLS Re-handshake failed ***\n");
955
923
gnutls_perror(ret);
956
924
errno = EPROTO;
957
925
goto mandos_end;
958
926
}
959
927
break;
960
928
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
929
fprintf(stderr, "Mandos plugin mandos-client: "
930
"Unknown error while reading data from"
931
" encrypted session with Mandos server\n");
963
932
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
933
errno = EIO;
965
934
goto mandos_end;
970
939
}
971
940
972
941
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
942
fprintf(stderr, "Mandos plugin mandos-client: "
943
"Closing TLS session\n");
974
944
}
975
945
976
946
if(quit_now){
989
959
if(buffer_length > 0){
990
960
ssize_t decrypted_buffer_size;
991
961
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
962
&decrypted_buffer);
993
963
if(decrypted_buffer_size >= 0){
994
964
995
965
written = 0;
1005
975
if(ret == 0 and ferror(stdout)){
1006
976
int e = errno;
1007
977
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
978
fprintf(stderr, "Mandos plugin mandos-client: "
979
"Error writing encrypted data: %s\n",
980
strerror(errno));
1010
981
}
1011
982
errno = e;
1012
983
goto mandos_end;
1043
1014
return retval;
1044
1015
}
1045
1016
1046
__attribute__((nonnull))
1047
1017
static void resolve_callback(AvahiSServiceResolver *r,
1048
1018
AvahiIfIndex interface,
1049
1019
AvahiProtocol proto,
1057
1027
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
1029
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(r);
1064
1032
1065
1033
/* Called whenever a service has been resolved successfully or
1066
1034
timed out */
1072
1040
switch(event){
1073
1041
default:
1074
1042
case AVAHI_RESOLVER_FAILURE:
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1043
fprintf(stderr, "Mandos plugin mandos-client: "
1044
"(Avahi Resolver) Failed to resolve service '%s'"
1045
" of type '%s' in domain '%s': %s\n", name, type, domain,
1046
avahi_strerror(avahi_server_errno(mc.server)));
1080
1047
break;
1081
1048
1082
1049
case AVAHI_RESOLVER_FOUND:
1084
1051
char ip[AVAHI_ADDRESS_STR_MAX];
1085
1052
avahi_address_snprint(ip, sizeof(ip), address);
1086
1053
if(debug){
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
ip, (intmax_t)interface, port);
1090
1058
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1095
1061
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1062
avahi_simple_poll_quit(mc.simple_poll);
1097
1063
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1104
1066
}
1105
1067
}
1106
1068
}
1116
1078
const char *domain,
1117
1079
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1080
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1081
AVAHI_GCC_UNUSED void* userdata){
1082
assert(b);
1123
1083
1124
1084
/* Called whenever a new services becomes available on the LAN or
1125
1085
is removed from the LAN */
1132
1092
default:
1133
1093
case AVAHI_BROWSER_FAILURE:
1134
1094
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1095
fprintf(stderr, "Mandos plugin mandos-client: "
1096
"(Avahi browser) %s\n",
1097
avahi_strerror(avahi_server_errno(mc.server)));
1098
avahi_simple_poll_quit(mc.simple_poll);
1139
1099
return;
1140
1100
1141
1101
case AVAHI_BROWSER_NEW:
1144
1104
the callback function is called the Avahi server will free the
1145
1105
resolver for us. */
1146
1106
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1107
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1108
name, type, domain, protocol, 0,
1109
resolve_callback, NULL) == NULL)
1110
fprintf(stderr, "Mandos plugin mandos-client: "
1111
"Avahi: Failed to resolve service '%s': %s\n",
1112
name, avahi_strerror(avahi_server_errno(mc.server)));
1155
1113
break;
1156
1114
1157
1115
case AVAHI_BROWSER_REMOVE:
1160
1118
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
1119
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
1120
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1121
fprintf(stderr, "Mandos plugin mandos-client: "
1122
"No Mandos server found, still searching...\n");
1165
1123
}
1166
1124
break;
1167
1125
}
1176
1134
signal_received = sig;
1177
1135
int old_errno = errno;
1178
1136
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1181
1139
}
1182
1140
errno = old_errno;
1183
1141
}
1184
1142
1185
__attribute__((nonnull, warn_unused_result))
1186
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1144
int ret;
1188
error_t ret_errno;
1189
1145
1190
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1147
if(s < 0){
1192
ret_errno = errno;
1193
1148
perror_plus("socket");
1194
errno = ret_errno;
1195
1149
return false;
1196
1150
}
1197
1151
strcpy(ifr->ifr_name, ifname);
1198
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1153
if(ret == -1){
1200
1154
if(debug){
1201
ret_errno = errno;
1202
1155
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
1156
}
1205
1157
return false;
1206
1158
}
1207
1159
return true;
1208
1160
}
1209
1161
1210
__attribute__((nonnull, warn_unused_result))
1211
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1163
1213
1164
/* Reject the loopback device */
1214
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
1166
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1218
1169
}
1219
1170
return false;
1220
1171
}
1221
1172
/* Accept point-to-point devices only if connect_to is specified */
1222
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
1174
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1226
1177
}
1227
1178
return true;
1228
1179
}
1229
1180
/* Otherwise, reject non-broadcast-capable devices */
1230
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
1182
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1234
1185
}
1235
1186
return false;
1236
1187
}
1237
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
1189
if(ifr->ifr_flags & IFF_NOARP){
1239
1190
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1242
1193
}
1243
1194
return false;
1244
1195
}
1245
1196
1246
1197
/* Accept this device */
1247
1198
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1249
1201
}
1250
1202
return true;
1251
1203
}
1255
1207
* corresponds to an acceptable network device.
1256
1208
* (This function is passed to scandir(3) as a filter function.)
1257
1209
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1210
int good_interface(const struct dirent *if_entry){
1260
1211
if(if_entry->d_name[0] == '.'){
1261
1212
return 0;
1264
1215
struct ifreq ifr;
1265
1216
if(not get_flags(if_entry->d_name, &ifr)){
1266
1217
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
if(not good_flags(if_entry->d_name, &ifr)){
1226
return 0;
1227
}
1228
return 1;
1229
}
1230
1231
/*
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1235
*/
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1238
return 0;
1239
}
1240
1241
struct ifreq ifr;
1242
if(not get_flags(if_entry->d_name, &ifr)){
1243
if(debug){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1246
if_entry->d_name);
1247
}
1248
return 0;
1249
}
1250
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1253
if(debug){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1256
if_entry->d_name);
1257
}
1258
return 0;
1259
}
1260
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1263
if(debug){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1266
if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1314
1277
int notdotentries(const struct dirent *direntry){
1315
1278
/* Skip "." and ".." */
1316
1279
if(direntry->d_name[0] == '.'
1323
1286
}
1324
1287
1325
1288
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1289
int runnable_hook(const struct dirent *direntry){
1328
1290
int ret;
1329
1291
size_t sret;
1337
1299
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
1300
"abcdefghijklmnopqrstuvwxyz"
1339
1301
"0123456789"
1340
"_.-");
1302
"_-");
1341
1303
if((direntry->d_name)[sret] != '\0'){
1342
1304
/* Contains non-allowed characters */
1343
1305
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1306
fprintf(stderr, "Mandos plugin mandos-client: "
1307
"Ignoring hook \"%s\" with bad name\n",
1308
direntry->d_name);
1346
1309
}
1347
1310
return 0;
1348
1311
}
1349
1312
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
char *fullname = NULL;
1314
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1315
if(ret < 0){
1316
perror_plus("asprintf");
1317
return 0;
1318
}
1319
1320
ret = stat(fullname, &st);
1351
1321
if(ret == -1){
1352
1322
if(debug){
1353
1323
perror_plus("Could not stat hook");
1357
1327
if(not (S_ISREG(st.st_mode))){
1358
1328
/* Not a regular file */
1359
1329
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1332
direntry->d_name);
1362
1333
}
1363
1334
return 0;
1364
1335
}
1365
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
1337
/* Not executable */
1367
1338
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1341
direntry->d_name);
1370
1342
}
1371
1343
return 0;
1372
1344
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
1345
return 1;
1378
1346
}
1379
1347
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1349
int ret;
1384
1350
struct timespec now;
1385
1351
struct timespec waited_time;
1386
1352
intmax_t block_time;
1387
1353
1388
1354
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1355
if(mc.current_server == NULL){
1356
if (debug){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1393
1359
}
1394
1360
ret = avahi_simple_poll_iterate(s, -1);
1395
1361
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1362
if (debug){
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1365
" or wait\n");
1399
1366
}
1400
1367
/* the current time */
1401
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1406
1373
/* Calculating in ms how long time between now and server
1407
1374
who we visted longest time ago. Now - last seen. */
1408
1375
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1376
- mc.current_server->last_seen.tv_sec);
1410
1377
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1378
- mc.current_server->last_seen.tv_nsec);
1412
1379
/* total time is 10s/10,000ms.
1413
1380
Converting to s from ms by dividing by 1,000,
1414
1381
and ns to ms by dividing by 1,000,000. */
1416
1383
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1384
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1385
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1386
if (debug){
1387
fprintf(stderr, "Mandos plugin mandos-client: "
1388
"Blocking for %" PRIdMAX " ms\n", block_time);
1422
1389
}
1423
1390
1424
1391
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1392
ret = start_mandos_communication(mc.current_server->ip,
1393
mc.current_server->port,
1394
mc.current_server->if_index,
1395
mc.current_server->af);
1429
1396
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1397
avahi_simple_poll_quit(mc.simple_poll);
1431
1398
return 0;
1432
1399
}
1433
1400
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1401
&mc.current_server->last_seen);
1435
1402
if(ret == -1){
1436
1403
perror_plus("clock_gettime");
1437
1404
return -1;
1438
1405
}
1439
mc->current_server = mc->current_server->next;
1406
mc.current_server = mc.current_server->next;
1440
1407
block_time = 0; /* Call avahi to find new Mandos
1441
1408
servers, but don't block */
1442
1409
}
1444
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1412
}
1446
1413
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1414
if (ret > 0 or errno != EINTR){
1448
1415
return (ret != 1) ? ret : 0;
1449
1416
}
1450
1417
}
1451
1418
}
1452
1419
}
1453
1420
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1508
const float delay){
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1536
if(numhooks == -1){
1537
perror_plus("scandir");
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1548
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1610
perror_plus("asprintf");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1615
free(delaystring);
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1659
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
1683
int ret;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
1692
if(quit_now){
1693
errno = old_errno;
1694
return EINTR;
1695
}
1696
1697
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
return ret_errno;
1705
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1707
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1710
ret_errno = errno;
1711
perror_plus("socket");
1712
errno = old_errno;
1713
return ret_errno;
1714
}
1715
1716
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(debug){
1726
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1727
interface);
1728
}
1729
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1736
1737
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1749
}
1750
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1753
#ifdef __linux__
1754
if(restore_loglevel){
1755
ret_linux = klogctl(7, NULL, 0);
1756
if(ret_linux == -1){
1757
perror_plus("klogctl");
1758
}
1759
}
1760
#endif /* __linux__ */
1761
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
errno = old_errno;
1782
return ioctl_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1786
interface);
1787
}
1788
1789
/* Sleep checking until interface is running.
1790
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
1792
if(interface_is_running(interface)){
1793
break;
1794
}
1795
struct timespec sleeptime = { .tv_nsec = 250000000 };
1796
ret = nanosleep(&sleeptime, NULL);
1797
if(ret == -1 and errno != EINTR){
1798
perror_plus("nanosleep");
1799
}
1800
}
1801
1802
errno = old_errno;
1803
return 0;
1804
}
1805
1806
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
1809
struct ifreq network;
1810
unsigned int if_index = if_nametoindex(interface);
1811
if(if_index == 0){
1812
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1813
errno = old_errno;
1814
return ENXIO;
1815
}
1816
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
if(not get_flags(interface, &network) and debug){
1819
ret_errno = errno;
1820
fprintf_plus(stderr, "Failed to get flags for interface "
1821
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
return ret_errno;
1824
}
1825
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1829
ret_errno = errno;
1830
perror_plus("socket");
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
1835
if(debug){
1836
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1837
interface);
1838
}
1839
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1879
}
1880
1881
1421
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1886
1422
AvahiSServiceBrowser *sb = NULL;
1887
error_t ret_errno;
1423
int error;
1888
1424
int ret;
1889
1425
intmax_t tmpmax;
1890
1426
char *tmp;
1891
1427
int exitcode = EXIT_SUCCESS;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1428
const char *interface = "";
1429
struct ifreq network;
1430
int sd = -1;
1431
bool take_down_interface = false;
1432
uid_t uid;
1433
gid_t gid;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
1897
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
1437
const char *seckey = PATHDIR "/" SECKEY;
1899
1438
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1901
1439
1902
1440
bool gnutls_initialized = false;
1903
1441
bool gpgme_initialized = false;
1965
1503
.group = 2 },
1966
1504
{ .name = "retry", .key = 132,
1967
1505
.arg = "SECONDS",
1968
.doc = "Retry interval used when denied by the Mandos server",
1506
.doc = "Retry interval used when denied by the mandos server",
1969
1507
.group = 2 },
1970
1508
{ .name = "network-hook-dir", .key = 133,
1971
1509
.arg = "DIR",
1994
1532
connect_to = arg;
1995
1533
break;
1996
1534
case 'i': /* --interface */
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
1535
interface = arg;
2002
1536
break;
2003
1537
case 's': /* --seckey */
2004
1538
seckey = arg;
2047
1581
argp_state_help(state, state->out_stream,
2048
1582
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2049
1583
case 'V': /* --version */
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1584
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1585
fprintf(state->out_stream, "%s\n", argp_program_version);
2051
1586
exit(argp_err_exit_status);
2052
1587
break;
2053
1588
default:
2080
1615
{
2081
1616
/* Work around Debian bug #633582:
2082
1617
<http://bugs.debian.org/633582> */
2083
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
1618
struct stat st;
1619
1620
/* Re-raise priviliges */
1621
errno = 0;
1622
ret = seteuid(0);
1623
if(ret == -1){
1624
perror_plus("seteuid");
1625
}
1626
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1631
} else {
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1633
if(ret == -1){
1634
perror_plus("fstat");
1635
} else {
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1638
if(ret == -1){
1639
perror_plus("fchown");
1640
}
1641
}
1642
}
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1644
}
1645
}
1646
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1651
} else {
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1653
if(ret == -1){
1654
perror_plus("fstat");
1655
} else {
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1658
if(ret == -1){
1659
perror_plus("fchown");
1660
}
1661
}
1662
}
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1664
}
1665
}
1666
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
}
1674
1675
/* Find network hooks and run them */
1676
{
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1680
alphasort);
1681
if(numhooks == -1){
1682
perror_plus("scandir");
2089
1683
} else {
2090
struct stat st;
2091
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2110
}
2111
}
2112
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
2156
}
2157
}
2158
}
2159
2160
/* Run network hooks */
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
2166
goto end;
2167
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1689
if(ret < 0){
1690
perror_plus("asprintf");
1691
continue;
1692
}
1693
pid_t hook_pid = fork();
1694
if(hook_pid == 0){
1695
/* Child */
1696
dup2(devnull, STDIN_FILENO);
1697
close(devnull);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1700
if(ret == -1){
1701
perror_plus("setenv");
1702
exit(1);
1703
}
1704
ret = setenv("DEVICE", interface, 1);
1705
if(ret == -1){
1706
perror_plus("setenv");
1707
exit(1);
1708
}
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1710
if(ret == -1){
1711
perror_plus("setenv");
1712
exit(1);
1713
}
1714
ret = setenv("MODE", "start", 1);
1715
if(ret == -1){
1716
perror_plus("setenv");
1717
exit(1);
1718
}
1719
char *delaystring;
1720
ret = asprintf(&delaystring, "%f", delay);
1721
if(ret == -1){
1722
perror_plus("asprintf");
1723
exit(1);
1724
}
1725
ret = setenv("DELAY", delaystring, 1);
1726
if(ret == -1){
1727
free(delaystring);
1728
perror_plus("setenv");
1729
exit(1);
1730
}
1731
free(delaystring);
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1734
} else {
1735
int status;
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1738
free(fullname);
1739
continue;
1740
}
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1747
free(fullname);
1748
continue;
1749
}
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1754
WTERMSIG(status));
1755
free(fullname);
1756
continue;
1757
} else {
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
1760
direntry->d_name);
1761
free(fullname);
1762
continue;
1763
}
1764
}
1765
free(fullname);
1766
if(quit_now){
1767
goto end;
1768
}
1769
}
1770
close(devnull);
1771
}
2173
1772
}
2174
1773
2175
1774
if(not debug){
2176
1775
avahi_set_log_function(empty_log);
2177
1776
}
2178
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1808
goto end;
1809
}
1810
}
1811
2179
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2180
1813
from the signal handler */
2181
1814
/* Initialize the pseudo-RNG for Avahi */
2182
1815
srand((unsigned int) time(NULL));
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
2187
1820
exitcode = EX_UNAVAILABLE;
2188
1821
goto end;
2189
1822
}
2251
1884
}
2252
1885
}
2253
1886
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1890
if(if_index == 0){
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1894
goto end;
1895
}
1896
1897
if(quit_now){
1898
goto end;
1899
}
1900
1901
/* Re-raise priviliges */
1902
errno = 0;
1903
ret = seteuid(0);
1904
if(ret == -1){
1905
perror_plus("seteuid");
1906
}
1907
1908
#ifdef __linux__
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1913
if(ret == -1){
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1916
}
1917
#endif /* __linux__ */
1918
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
if(sd < 0){
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1923
#ifdef __linux__
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1926
if(ret == -1){
1927
perror_plus("klogctl");
1928
}
1929
}
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1932
errno = 0;
1933
ret = seteuid(uid);
1934
if(ret == -1){
1935
perror_plus("seteuid");
1936
}
1937
goto end;
1938
}
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
if(ret == -1){
1942
perror_plus("ioctl SIOCGIFFLAGS");
1943
#ifdef __linux__
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1946
if(ret == -1){
1947
perror_plus("klogctl");
1948
}
1949
}
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
if(ret == -1){
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1968
#ifdef __linux__
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1971
if(ret == -1){
1972
perror_plus("klogctl");
1973
}
1974
}
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1977
errno = 0;
1978
ret = seteuid(uid);
1979
if(ret == -1){
1980
perror_plus("seteuid");
1981
}
1982
goto end;
1983
}
1984
}
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
if(ret == -1){
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1992
break;
1993
}
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
1998
}
1999
}
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
if(ret == -1){
2004
perror_plus("close");
2005
}
2006
}
2007
#ifdef __linux__
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2011
if(ret == -1){
2012
perror_plus("klogctl");
2013
}
2014
}
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2017
errno = 0;
2018
if(take_down_interface){
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2276
2024
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2280
fprintf_plus(stderr, "Could not find a network interface\n");
2281
exitcode = EXIT_FAILURE;
2282
goto end;
2283
}
2284
}
2285
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2288
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2290
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
2303
}
2304
}
2305
break;
2306
}
2307
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2309
if(not interface_was_up){
2310
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2312
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2319
}
2320
}
2321
}
2322
if(debug and (interfaces_to_take_down == NULL)){
2323
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
}
2325
}
2326
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2025
/* Lower privileges permanently */
2026
ret = setuid(uid);
2027
if(ret == -1){
2028
perror_plus("setuid");
2029
}
2030
}
2334
2031
}
2335
2032
2336
2033
if(quit_now){
2337
2034
goto end;
2338
2035
}
2339
2036
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2037
ret = init_gnutls_global(pubkey, seckey);
2341
2038
if(ret == -1){
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2343
2041
exitcode = EX_UNAVAILABLE;
2344
2042
goto end;
2345
2043
} else {
2350
2048
goto end;
2351
2049
}
2352
2050
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
2051
if(mkdtemp(tempdir) == NULL){
2363
2052
perror_plus("mkdtemp");
2364
2053
goto end;
2365
2054
}
2055
tempdir_created = true;
2366
2056
2367
2057
if(quit_now){
2368
2058
goto end;
2369
2059
}
2370
2060
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2372
fprintf_plus(stderr, "init_gpgme failed\n");
2061
if(not init_gpgme(pubkey, seckey, tempdir)){
2062
fprintf(stderr, "Mandos plugin mandos-client: "
2063
"init_gpgme failed\n");
2373
2064
exitcode = EX_UNAVAILABLE;
2374
2065
goto end;
2375
2066
} else {
2384
2075
/* Connect directly, do not use Zeroconf */
2385
2076
/* (Mainly meant for debugging) */
2386
2077
char *address = strrchr(connect_to, ':');
2387
2388
2078
if(address == NULL){
2389
fprintf_plus(stderr, "No colon in address\n");
2079
fprintf(stderr, "Mandos plugin mandos-client: "
2080
"No colon in address\n");
2390
2081
exitcode = EX_USAGE;
2391
2082
goto end;
2392
2083
}
2395
2086
goto end;
2396
2087
}
2397
2088
2398
in_port_t port;
2089
uint16_t port;
2399
2090
errno = 0;
2400
2091
tmpmax = strtoimax(address+1, &tmp, 10);
2401
2092
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2402
or tmpmax != (in_port_t)tmpmax){
2403
fprintf_plus(stderr, "Bad port number\n");
2093
or tmpmax != (uint16_t)tmpmax){
2094
fprintf(stderr, "Mandos plugin mandos-client: "
2095
"Bad port number\n");
2404
2096
exitcode = EX_USAGE;
2405
2097
goto end;
2406
2098
}
2407
2099
2408
2100
if(quit_now){
2409
2101
goto end;
2410
2102
}
2411
2103
2412
port = (in_port_t)tmpmax;
2104
port = (uint16_t)tmpmax;
2413
2105
*address = '\0';
2414
2106
/* Colon in address indicates IPv6 */
2415
2107
int af;
2431
2123
}
2432
2124
2433
2125
while(not quit_now){
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2126
ret = start_mandos_communication(address, port, if_index, af);
2436
2127
if(quit_now or ret == 0){
2437
2128
break;
2438
2129
}
2439
2130
if(debug){
2440
fprintf_plus(stderr, "Retrying in %d seconds\n",
2441
(int)retry_interval);
2131
fprintf(stderr, "Mandos plugin mandos-client: "
2132
"Retrying in %d seconds\n", (int)retry_interval);
2442
2133
}
2443
sleep((unsigned int)retry_interval);
2134
sleep((int)retry_interval);
2444
2135
}
2445
2136
2446
if(not quit_now){
2137
if (not quit_now){
2447
2138
exitcode = EXIT_SUCCESS;
2448
2139
}
2449
2140
2464
2155
config.publish_domain = 0;
2465
2156
2466
2157
/* Allocate a new server */
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2158
mc.server = avahi_server_new(avahi_simple_poll_get
2159
(mc.simple_poll), &config, NULL,
2160
NULL, &error);
2469
2161
2470
2162
/* Free the Avahi configuration data */
2471
2163
avahi_server_config_free(&config);
2473
2165
2474
2166
/* Check if creating the Avahi server object succeeded */
2475
2167
if(mc.server == NULL){
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
2168
fprintf(stderr, "Mandos plugin mandos-client: "
2169
"Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2478
2171
exitcode = EX_UNAVAILABLE;
2479
2172
goto end;
2480
2173
}
2486
2179
/* Create the Avahi service browser */
2487
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2488
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2491
2183
if(sb == NULL){
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2493
avahi_strerror(avahi_server_errno(mc.server)));
2184
fprintf(stderr, "Mandos plugin mandos-client: "
2185
"Failed to create service browser: %s\n",
2186
avahi_strerror(avahi_server_errno(mc.server)));
2494
2187
exitcode = EX_UNAVAILABLE;
2495
2188
goto end;
2496
2189
}
2502
2195
/* Run the main loop */
2503
2196
2504
2197
if(debug){
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2506
2200
}
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2201
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2510
2204
if(debug){
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2512
(ret == 0) ? "successfully" : "with error");
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2513
2208
}
2514
2209
2515
2210
end:
2516
2211
2517
2212
if(debug){
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2519
2215
}
2520
2216
2521
2217
/* Cleanup things */
2522
free(mc.interfaces);
2523
2524
2218
if(sb != NULL)
2525
2219
avahi_s_service_browser_free(sb);
2526
2220
2527
2221
if(mc.server != NULL)
2528
2222
avahi_server_free(mc.server);
2529
2223
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2532
2226
2533
2227
if(gnutls_initialized){
2534
2228
gnutls_certificate_free_credentials(mc.cred);
2539
2233
if(gpgme_initialized){
2540
2234
gpgme_release(mc.ctx);
2541
2235
}
2542
2236
2543
2237
/* Cleans up the circular linked list of Mandos servers the client
2544
2238
has seen */
2545
2239
if(mc.current_server != NULL){
2551
2245
}
2552
2246
}
2553
2247
2554
/* Re-raise privileges */
2555
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2248
/* XXX run network hooks "stop" here */
2249
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2253
errno = 0;
2254
ret = seteuid(0);
2255
if(ret == -1){
2256
perror_plus("seteuid");
2583
2257
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2258
if(geteuid() == 0){
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2265
if(ret == -1){
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
}
2268
}
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2589
2279
}
2590
2280
}
2591
2281
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2594
2595
2282
/* Removes the GPGME temp directory and all files inside */
2596
if(tempdir != NULL){
2283
if(tempdir_created){
2597
2284
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2287
alphasort);
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
2290
direntry = direntries[i];
2291
char *fullname = NULL;
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
2293
direntry->d_name);
2294
if(ret < 0){
2295
perror_plus("asprintf");
2296
continue;
2297
}
2298
ret = remove(fullname);
2299
if(ret == -1){
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2302
}
2303
free(fullname);
2634
2304
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2305
}
2306
2307
/* need to clean even if 0 because man page doesn't specify */
2308
free(direntries);
2309
if (numentries == -1){
2310
perror_plus("scandir");
2311
}
2312
ret = rmdir(tempdir);
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");
2636
2315
}
2637
2316
}
2638
2317
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0