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- Committer: teddy at bsnet
- Date: 2011-11-13 13:55:45 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111113135545-hyb59g1q2icwdcte
* plugins.d/mandos-client.c: Some white space fixes.
(runnable_hook): Simplify name rule. More debug messages.
(runnable_hook): Simplify name rule. More debug messages.
- files removed:
- debian/mandos-client.examples
- 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
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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
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
177
/*
199
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
179
* bytes. "buffer_capacity" is how much is currently allocated,
201
180
* "buffer_length" is how much is already used.
202
181
*/
203
__attribute__((nonnull, warn_unused_result))
204
182
size_t incbuffer(char **buffer, size_t buffer_length,
205
183
size_t buffer_capacity){
206
184
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;
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
213
187
return 0;
214
188
}
215
*buffer = new_buf;
216
189
buffer_capacity += BUFFER_SIZE;
217
190
}
218
191
return buffer_capacity;
219
192
}
220
193
221
194
/* 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){
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
int af){
225
197
int ret;
226
198
server *new_server = malloc(sizeof(server));
227
199
if(new_server == NULL){
228
200
perror_plus("malloc");
229
return false;
201
return -1;
230
202
}
231
203
*new_server = (server){ .ip = strdup(ip),
232
204
.port = port,
234
206
.af = af };
235
207
if(new_server->ip == NULL){
236
208
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;
209
return -1;
243
210
}
244
211
/* Special case of first server */
245
if(*current_server == NULL){
212
if (mc.current_server == NULL){
246
213
new_server->next = new_server;
247
214
new_server->prev = new_server;
248
*current_server = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
249
217
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
253
220
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
257
229
}
258
230
259
231
/*
260
232
* Initialize GPGME.
261
233
*/
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){
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
267
236
gpgme_error_t rc;
268
237
gpgme_engine_info_t engine_info;
269
238
239
270
240
/*
271
241
* Helper function to insert pub and seckey to the engine keyring.
272
242
*/
273
bool import_key(const char * const filename){
243
bool import_key(const char *filename){
274
244
int ret;
275
245
int fd;
276
246
gpgme_data_t pgp_data;
283
253
284
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
255
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));
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
288
259
return false;
289
260
}
290
261
291
rc = gpgme_op_import(mc->ctx, pgp_data);
262
rc = gpgme_op_import(mc.ctx, pgp_data);
292
263
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
295
267
return false;
296
268
}
297
269
304
276
}
305
277
306
278
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
308
281
}
309
282
310
283
/* Init GPGME */
311
284
gpgme_check_version(NULL);
312
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
286
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));
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
316
290
return false;
317
291
}
318
292
319
293
/* Set GPGME home directory for the OpenPGP engine only */
320
294
rc = gpgme_get_engine_info(&engine_info);
321
295
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));
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
324
299
return false;
325
300
}
326
301
while(engine_info != NULL){
332
307
engine_info = engine_info->next;
333
308
}
334
309
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
337
312
return false;
338
313
}
339
314
340
315
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
316
rc = gpgme_new(&(mc.ctx));
342
317
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));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
346
321
return false;
347
322
}
348
323
357
332
* Decrypt OpenPGP data.
358
333
* Returns -1 on error
359
334
*/
360
__attribute__((nonnull, warn_unused_result))
361
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
336
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
337
char **plaintext){
365
338
gpgme_data_t dh_crypto, dh_plain;
366
339
gpgme_error_t rc;
367
340
ssize_t ret;
369
342
ssize_t plaintext_length = 0;
370
343
371
344
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
373
347
}
374
348
375
349
/* Create new GPGME data buffer from memory cryptotext */
376
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
351
0);
378
352
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));
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
381
356
return -1;
382
357
}
383
358
384
359
/* Create new empty GPGME data buffer for the plaintext */
385
360
rc = gpgme_data_new(&dh_plain);
386
361
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));
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
390
365
gpgme_data_release(dh_crypto);
391
366
return -1;
392
367
}
393
368
394
369
/* Decrypt data from the cryptotext data buffer to the plaintext
395
370
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
372
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
400
376
plaintext_length = -1;
401
377
if(debug){
402
378
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
404
380
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
406
383
} 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);
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);
411
390
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
413
393
}
414
394
gpgme_recipient_t recipient;
415
395
recipient = result->recipients;
416
396
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");
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");
424
406
recipient = recipient->next;
425
407
}
426
408
}
429
411
}
430
412
431
413
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
433
416
}
434
417
435
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
466
449
}
467
450
468
451
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
470
454
for(ssize_t i = 0; i < plaintext_length; i++){
471
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
456
}
483
467
return plaintext_length;
484
468
}
485
469
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
489
473
if(ret == NULL)
490
474
ret = "(unknown)";
491
475
return ret;
492
476
}
493
477
494
478
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
479
static void debuggnutls(__attribute__((unused)) int level,
497
480
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
499
482
}
500
483
501
__attribute__((nonnull, warn_unused_result))
502
484
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
485
const char *seckeyfilename){
505
486
int ret;
506
487
507
488
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
509
491
}
510
492
511
493
ret = gnutls_global_init();
512
494
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
515
497
return -1;
516
498
}
517
499
524
506
}
525
507
526
508
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
510
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
531
513
gnutls_global_deinit();
532
514
return -1;
533
515
}
534
516
535
517
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);
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);
540
522
}
541
523
542
524
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
544
526
GNUTLS_OPENPGP_FMT_BASE64);
545
527
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));
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));
551
534
goto globalfail;
552
535
}
553
536
554
537
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
556
539
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
560
543
goto globalfail;
561
544
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
546
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
566
550
goto globalfail;
567
551
}
568
552
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
554
571
555
return 0;
572
556
573
557
globalfail:
574
558
575
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
576
560
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
578
562
return -1;
579
563
}
580
564
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
565
static int init_gnutls_session(gnutls_session_t *session){
584
566
int ret;
585
567
/* GnuTLS session creation */
586
568
do {
590
572
}
591
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
574
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
596
578
}
597
579
598
580
{
599
581
const char *err;
600
582
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
584
if(quit_now){
603
585
gnutls_deinit(*session);
604
586
return -1;
605
587
}
606
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
589
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));
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));
611
594
gnutls_deinit(*session);
612
595
return -1;
613
596
}
615
598
616
599
do {
617
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
601
mc.cred);
619
602
if(quit_now){
620
603
gnutls_deinit(*session);
621
604
return -1;
622
605
}
623
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
607
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
627
611
gnutls_deinit(*session);
628
612
return -1;
629
613
}
631
615
/* ignore client certificate if any. */
632
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
617
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
619
636
620
return 0;
637
621
}
641
625
__attribute__((unused)) const char *txt){}
642
626
643
627
/* 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,
628
static int start_mandos_communication(const char *ip, uint16_t port,
646
629
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
630
int af){
648
631
int ret, tcp_sd = -1;
649
632
ssize_t sret;
650
struct sockaddr_storage to;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
651
637
char *buffer = NULL;
652
638
char *decrypted_buffer = NULL;
653
639
size_t buffer_length = 0;
672
658
pf = PF_INET;
673
659
break;
674
660
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
676
663
errno = EINVAL;
677
664
return -1;
678
665
}
679
666
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);
667
ret = init_gnutls_session(&session);
713
668
if(ret != 0){
714
669
return -1;
715
670
}
716
671
717
672
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
720
676
}
721
677
722
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
734
690
735
691
memset(&to, 0, sizeof(to));
736
692
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);
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
695
} 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);
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
742
698
}
743
699
if(ret < 0 ){
744
700
int e = errno;
748
704
}
749
705
if(ret == 0){
750
706
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
752
709
errno = e;
753
710
goto mandos_end;
754
711
}
755
712
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)){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
759
720
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
762
724
errno = EINVAL;
763
725
goto mandos_end;
764
726
}
765
727
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
728
to.in6.sin6_scope_id = (uint32_t)if_index;
767
729
}
768
730
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
770
734
}
771
735
772
736
if(quit_now){
780
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
745
perror_plus("if_indextoname");
782
746
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
785
750
}
786
751
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
789
754
}
790
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
792
758
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
797
761
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
802
764
}
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);
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
767
} else {
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
771
}
809
772
}
810
773
}
811
774
815
778
}
816
779
817
780
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
782
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
784
}
824
785
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
787
int e = errno;
827
788
perror_plus("connect");
828
789
errno = e;
866
827
}
867
828
868
829
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
870
832
}
871
833
872
834
if(quit_now){
874
836
goto mandos_end;
875
837
}
876
838
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);
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
841
883
842
if(quit_now){
884
843
errno = EINTR;
895
854
896
855
if(ret != GNUTLS_E_SUCCESS){
897
856
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
899
859
gnutls_perror(ret);
900
860
}
901
861
errno = EPROTO;
905
865
/* Read OpenPGP packet that contains the wanted password */
906
866
907
867
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
910
870
}
911
871
912
872
while(true){
950
910
}
951
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
912
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
955
915
gnutls_perror(ret);
956
916
errno = EPROTO;
957
917
goto mandos_end;
958
918
}
959
919
break;
960
920
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
963
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
925
errno = EIO;
965
926
goto mandos_end;
970
931
}
971
932
972
933
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
974
936
}
975
937
976
938
if(quit_now){
989
951
if(buffer_length > 0){
990
952
ssize_t decrypted_buffer_size;
991
953
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
954
&decrypted_buffer);
993
955
if(decrypted_buffer_size >= 0){
994
956
995
957
written = 0;
1005
967
if(ret == 0 and ferror(stdout)){
1006
968
int e = errno;
1007
969
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1010
973
}
1011
974
errno = e;
1012
975
goto mandos_end;
1043
1006
return retval;
1044
1007
}
1045
1008
1046
__attribute__((nonnull))
1047
1009
static void resolve_callback(AvahiSServiceResolver *r,
1048
1010
AvahiIfIndex interface,
1049
1011
AvahiProtocol proto,
1057
1019
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
1020
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
1021
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1064
1024
1065
1025
/* Called whenever a service has been resolved successfully or
1066
1026
timed out */
1072
1032
switch(event){
1073
1033
default:
1074
1034
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)));
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)));
1080
1039
break;
1081
1040
1082
1041
case AVAHI_RESOLVER_FOUND:
1084
1043
char ip[AVAHI_ADDRESS_STR_MAX];
1085
1044
avahi_address_snprint(ip, sizeof(ip), address);
1086
1045
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);
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);
1090
1050
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1095
1053
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1054
avahi_simple_poll_quit(mc.simple_poll);
1097
1055
} 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
}
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1104
1058
}
1105
1059
}
1106
1060
}
1116
1070
const char *domain,
1117
1071
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1072
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1123
1075
1124
1076
/* Called whenever a new services becomes available on the LAN or
1125
1077
is removed from the LAN */
1132
1084
default:
1133
1085
case AVAHI_BROWSER_FAILURE:
1134
1086
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);
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);
1139
1091
return;
1140
1092
1141
1093
case AVAHI_BROWSER_NEW:
1144
1096
the callback function is called the Avahi server will free the
1145
1097
resolver for us. */
1146
1098
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)));
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)));
1155
1105
break;
1156
1106
1157
1107
case AVAHI_BROWSER_REMOVE:
1160
1110
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
1111
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
1112
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1165
1115
}
1166
1116
break;
1167
1117
}
1176
1126
signal_received = sig;
1177
1127
int old_errno = errno;
1178
1128
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1181
1131
}
1182
1132
errno = old_errno;
1183
1133
}
1184
1134
1185
__attribute__((nonnull, warn_unused_result))
1186
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1136
int ret;
1188
error_t ret_errno;
1189
1137
1190
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1139
if(s < 0){
1192
ret_errno = errno;
1193
1140
perror_plus("socket");
1194
errno = ret_errno;
1195
1141
return false;
1196
1142
}
1197
1143
strcpy(ifr->ifr_name, ifname);
1198
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1145
if(ret == -1){
1200
1146
if(debug){
1201
ret_errno = errno;
1202
1147
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
1148
}
1205
1149
return false;
1206
1150
}
1207
1151
return true;
1208
1152
}
1209
1153
1210
__attribute__((nonnull, warn_unused_result))
1211
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1155
1213
1156
/* Reject the loopback device */
1214
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
1158
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1218
1161
}
1219
1162
return false;
1220
1163
}
1221
1164
/* Accept point-to-point devices only if connect_to is specified */
1222
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
1166
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1226
1169
}
1227
1170
return true;
1228
1171
}
1229
1172
/* Otherwise, reject non-broadcast-capable devices */
1230
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
1174
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1234
1177
}
1235
1178
return false;
1236
1179
}
1237
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
1181
if(ifr->ifr_flags & IFF_NOARP){
1239
1182
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1242
1185
}
1243
1186
return false;
1244
1187
}
1245
1188
1246
1189
/* Accept this device */
1247
1190
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1249
1193
}
1250
1194
return true;
1251
1195
}
1255
1199
* corresponds to an acceptable network device.
1256
1200
* (This function is passed to scandir(3) as a filter function.)
1257
1201
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1202
int good_interface(const struct dirent *if_entry){
1260
1203
if(if_entry->d_name[0] == '.'){
1261
1204
return 0;
1264
1207
struct ifreq ifr;
1265
1208
if(not get_flags(if_entry->d_name, &ifr)){
1266
1209
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))
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;
1267
}
1268
1314
1269
int notdotentries(const struct dirent *direntry){
1315
1270
/* Skip "." and ".." */
1316
1271
if(direntry->d_name[0] == '.'
1323
1278
}
1324
1279
1325
1280
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1281
int runnable_hook(const struct dirent *direntry){
1328
1282
int ret;
1329
1283
size_t sret;
1337
1291
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
1292
"abcdefghijklmnopqrstuvwxyz"
1339
1293
"0123456789"
1340
"_.-");
1294
"_-");
1341
1295
if((direntry->d_name)[sret] != '\0'){
1342
1296
/* Contains non-allowed characters */
1343
1297
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1346
1301
}
1347
1302
return 0;
1348
1303
}
1349
1304
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1351
1313
if(ret == -1){
1352
1314
if(debug){
1353
1315
perror_plus("Could not stat hook");
1357
1319
if(not (S_ISREG(st.st_mode))){
1358
1320
/* Not a regular file */
1359
1321
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1362
1325
}
1363
1326
return 0;
1364
1327
}
1365
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
1329
/* Not executable */
1367
1330
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1370
1334
}
1371
1335
return 0;
1372
1336
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
1337
return 1;
1378
1338
}
1379
1339
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1341
int ret;
1384
1342
struct timespec now;
1385
1343
struct timespec waited_time;
1386
1344
intmax_t block_time;
1387
1345
1388
1346
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");
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1393
1351
}
1394
1352
ret = avahi_simple_poll_iterate(s, -1);
1395
1353
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1399
1358
}
1400
1359
/* the current time */
1401
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1406
1365
/* Calculating in ms how long time between now and server
1407
1366
who we visted longest time ago. Now - last seen. */
1408
1367
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1368
- mc.current_server->last_seen.tv_sec);
1410
1369
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1370
- mc.current_server->last_seen.tv_nsec);
1412
1371
/* total time is 10s/10,000ms.
1413
1372
Converting to s from ms by dividing by 1,000,
1414
1373
and ns to ms by dividing by 1,000,000. */
1416
1375
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1376
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1377
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1422
1381
}
1423
1382
1424
1383
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);
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);
1429
1388
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1389
avahi_simple_poll_quit(mc.simple_poll);
1431
1390
return 0;
1432
1391
}
1433
1392
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1393
&mc.current_server->last_seen);
1435
1394
if(ret == -1){
1436
1395
perror_plus("clock_gettime");
1437
1396
return -1;
1438
1397
}
1439
mc->current_server = mc->current_server->next;
1398
mc.current_server = mc.current_server->next;
1440
1399
block_time = 0; /* Call avahi to find new Mandos
1441
1400
servers, but don't block */
1442
1401
}
1444
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1404
}
1446
1405
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1406
if (ret > 0 or errno != EINTR){
1448
1407
return (ret != 1) ? ret : 0;
1449
1408
}
1450
1409
}
1451
1410
}
1452
1411
}
1453
1412
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
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
#ifndef O_CLOEXEC
1511
/*
1512
* Based on the example in the GNU LibC manual chapter 13.13 "File
1513
* Descriptor Flags".
1514
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
*/
1516
__attribute__((warn_unused_result))
1517
static int set_cloexec_flag(int fd){
1518
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1519
/* If reading the flags failed, return error indication now. */
1520
if(ret < 0){
1521
return ret;
1522
}
1523
/* Store modified flag word in the descriptor. */
1524
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1525
ret | FD_CLOEXEC));
1526
}
1527
#endif /* not O_CLOEXEC */
1528
1529
__attribute__((nonnull))
1530
void run_network_hooks(const char *mode, const char *interface,
1531
const float delay){
1532
struct dirent **direntries;
1533
if(hookdir_fd == -1){
1534
hookdir_fd = open(hookdir, O_RDONLY |
1535
#ifdef O_CLOEXEC
1536
O_CLOEXEC
1537
#else /* not O_CLOEXEC */
1538
0
1539
#endif /* not O_CLOEXEC */
1540
);
1541
if(hookdir_fd == -1){
1542
if(errno == ENOENT){
1543
if(debug){
1544
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1545
" found\n", hookdir);
1546
}
1547
} else {
1548
perror_plus("open");
1549
}
1550
return;
1551
}
1552
#ifndef O_CLOEXEC
1553
if(set_cloexec_flag(hookdir_fd) < 0){
1554
perror_plus("set_cloexec_flag");
1555
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1556
perror_plus("close");
1557
} else {
1558
hookdir_fd = -1;
1559
}
1560
return;
1561
}
1562
#endif /* not O_CLOEXEC */
1563
}
1564
#ifdef __GLIBC__
1565
#if __GLIBC_PREREQ(2, 15)
1566
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1567
runnable_hook, alphasort);
1568
#else /* not __GLIBC_PREREQ(2, 15) */
1569
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
alphasort);
1571
#endif /* not __GLIBC_PREREQ(2, 15) */
1572
#else /* not __GLIBC__ */
1573
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
alphasort);
1575
#endif /* not __GLIBC__ */
1576
if(numhooks == -1){
1577
perror_plus("scandir");
1578
return;
1579
}
1580
struct dirent *direntry;
1581
int ret;
1582
int devnull = open("/dev/null", O_RDONLY);
1583
for(int i = 0; i < numhooks; i++){
1584
direntry = direntries[i];
1585
if(debug){
1586
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1587
direntry->d_name);
1588
}
1589
pid_t hook_pid = fork();
1590
if(hook_pid == 0){
1591
/* Child */
1592
/* Raise privileges */
1593
if(raise_privileges_permanently() != 0){
1594
perror_plus("Failed to raise privileges");
1595
_exit(EX_NOPERM);
1596
}
1597
/* Set group */
1598
errno = 0;
1599
ret = setgid(0);
1600
if(ret == -1){
1601
perror_plus("setgid");
1602
_exit(EX_NOPERM);
1603
}
1604
/* Reset supplementary groups */
1605
errno = 0;
1606
ret = setgroups(0, NULL);
1607
if(ret == -1){
1608
perror_plus("setgroups");
1609
_exit(EX_NOPERM);
1610
}
1611
ret = dup2(devnull, STDIN_FILENO);
1612
if(ret == -1){
1613
perror_plus("dup2(devnull, STDIN_FILENO)");
1614
_exit(EX_OSERR);
1615
}
1616
ret = close(devnull);
1617
if(ret == -1){
1618
perror_plus("close");
1619
_exit(EX_OSERR);
1620
}
1621
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
if(ret == -1){
1623
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1624
_exit(EX_OSERR);
1625
}
1626
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1627
if(ret == -1){
1628
perror_plus("setenv");
1629
_exit(EX_OSERR);
1630
}
1631
ret = setenv("DEVICE", interface, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1637
if(ret == -1){
1638
perror_plus("setenv");
1639
_exit(EX_OSERR);
1640
}
1641
ret = setenv("MODE", mode, 1);
1642
if(ret == -1){
1643
perror_plus("setenv");
1644
_exit(EX_OSERR);
1645
}
1646
char *delaystring;
1647
ret = asprintf(&delaystring, "%f", (double)delay);
1648
if(ret == -1){
1649
perror_plus("asprintf");
1650
_exit(EX_OSERR);
1651
}
1652
ret = setenv("DELAY", delaystring, 1);
1653
if(ret == -1){
1654
free(delaystring);
1655
perror_plus("setenv");
1656
_exit(EX_OSERR);
1657
}
1658
free(delaystring);
1659
if(connect_to != NULL){
1660
ret = setenv("CONNECT", connect_to, 1);
1661
if(ret == -1){
1662
perror_plus("setenv");
1663
_exit(EX_OSERR);
1664
}
1665
}
1666
if(fexecve(hookdir_fd, (char *const [])
1667
{ direntry->d_name, NULL }, environ) == -1){
1668
perror_plus("fexecve");
1669
_exit(EXIT_FAILURE);
1670
}
1671
} else {
1672
int status;
1673
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1674
perror_plus("waitpid");
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
continue;
1683
}
1684
} else if(WIFSIGNALED(status)){
1685
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1686
" signal %d\n", direntry->d_name,
1687
WTERMSIG(status));
1688
continue;
1689
} else {
1690
fprintf_plus(stderr, "Warning: network hook \"%s\""
1691
" crashed\n", direntry->d_name);
1692
continue;
1693
}
1694
}
1695
if(debug){
1696
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1697
direntry->d_name);
1698
}
1699
}
1700
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1701
perror_plus("close");
1702
} else {
1703
hookdir_fd = -1;
1704
}
1705
close(devnull);
1706
}
1707
1708
__attribute__((nonnull, warn_unused_result))
1709
error_t bring_up_interface(const char *const interface,
1710
const float delay){
1711
error_t old_errno = errno;
1712
int ret;
1713
struct ifreq network;
1714
unsigned int if_index = if_nametoindex(interface);
1715
if(if_index == 0){
1716
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1717
errno = old_errno;
1718
return ENXIO;
1719
}
1720
1721
if(quit_now){
1722
errno = old_errno;
1723
return EINTR;
1724
}
1725
1726
if(not interface_is_up(interface)){
1727
error_t ret_errno = 0, ioctl_errno = 0;
1728
if(not get_flags(interface, &network)){
1729
ret_errno = errno;
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
errno = old_errno;
1733
return ret_errno;
1734
}
1735
network.ifr_flags |= IFF_UP; /* set flag */
1736
1737
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1738
if(sd == -1){
1739
ret_errno = errno;
1740
perror_plus("socket");
1741
errno = old_errno;
1742
return ret_errno;
1743
}
1744
1745
if(quit_now){
1746
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1747
if(ret == -1){
1748
perror_plus("close");
1749
}
1750
errno = old_errno;
1751
return EINTR;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise privileges */
1760
ret_errno = raise_privileges();
1761
if(ret_errno != 0){
1762
perror_plus("Failed to raise privileges");
1763
}
1764
1765
#ifdef __linux__
1766
int ret_linux;
1767
bool restore_loglevel = false;
1768
if(ret_errno == 0){
1769
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1770
messages about the network interface to mess up the prompt */
1771
ret_linux = klogctl(8, NULL, 5);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
} else {
1775
restore_loglevel = true;
1776
}
1777
}
1778
#endif /* __linux__ */
1779
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1780
ioctl_errno = errno;
1781
#ifdef __linux__
1782
if(restore_loglevel){
1783
ret_linux = klogctl(7, NULL, 0);
1784
if(ret_linux == -1){
1785
perror_plus("klogctl");
1786
}
1787
}
1788
#endif /* __linux__ */
1789
1790
/* If raise_privileges() succeeded above */
1791
if(ret_errno == 0){
1792
/* Lower privileges */
1793
ret_errno = lower_privileges();
1794
if(ret_errno != 0){
1795
errno = ret_errno;
1796
perror_plus("Failed to lower privileges");
1797
}
1798
}
1799
1800
/* Close the socket */
1801
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1802
if(ret == -1){
1803
perror_plus("close");
1804
}
1805
1806
if(ret_setflags == -1){
1807
errno = ioctl_errno;
1808
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1809
errno = old_errno;
1810
return ioctl_errno;
1811
}
1812
} else if(debug){
1813
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1814
interface);
1815
}
1816
1817
/* Sleep checking until interface is running.
1818
Check every 0.25s, up to total time of delay */
1819
for(int i=0; i < delay * 4; i++){
1820
if(interface_is_running(interface)){
1821
break;
1822
}
1823
struct timespec sleeptime = { .tv_nsec = 250000000 };
1824
ret = nanosleep(&sleeptime, NULL);
1825
if(ret == -1 and errno != EINTR){
1826
perror_plus("nanosleep");
1827
}
1828
}
1829
1830
errno = old_errno;
1831
return 0;
1832
}
1833
1834
__attribute__((nonnull, warn_unused_result))
1835
error_t take_down_interface(const char *const interface){
1836
error_t old_errno = errno;
1837
struct ifreq network;
1838
unsigned int if_index = if_nametoindex(interface);
1839
if(if_index == 0){
1840
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1841
errno = old_errno;
1842
return ENXIO;
1843
}
1844
if(interface_is_up(interface)){
1845
error_t ret_errno = 0, ioctl_errno = 0;
1846
if(not get_flags(interface, &network) and debug){
1847
ret_errno = errno;
1848
fprintf_plus(stderr, "Failed to get flags for interface "
1849
"\"%s\"\n", interface);
1850
errno = old_errno;
1851
return ret_errno;
1852
}
1853
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1854
1855
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1856
if(sd == -1){
1857
ret_errno = errno;
1858
perror_plus("socket");
1859
errno = old_errno;
1860
return ret_errno;
1861
}
1862
1863
if(debug){
1864
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1865
interface);
1866
}
1867
1868
/* Raise privileges */
1869
ret_errno = raise_privileges();
1870
if(ret_errno != 0){
1871
perror_plus("Failed to raise privileges");
1872
}
1873
1874
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1875
ioctl_errno = errno;
1876
1877
/* If raise_privileges() succeeded above */
1878
if(ret_errno == 0){
1879
/* Lower privileges */
1880
ret_errno = lower_privileges();
1881
if(ret_errno != 0){
1882
errno = ret_errno;
1883
perror_plus("Failed to lower privileges");
1884
}
1885
}
1886
1887
/* Close the socket */
1888
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1889
if(ret == -1){
1890
perror_plus("close");
1891
}
1892
1893
if(ret_setflags == -1){
1894
errno = ioctl_errno;
1895
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1896
errno = old_errno;
1897
return ioctl_errno;
1898
}
1899
} else if(debug){
1900
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1901
interface);
1902
}
1903
1904
errno = old_errno;
1905
return 0;
1906
}
1907
1908
1413
int main(int argc, char *argv[]){
1909
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1910
.priority = "SECURE256:!CTYPE-X.509:"
1911
"+CTYPE-OPENPGP", .current_server = NULL,
1912
.interfaces = NULL, .interfaces_size = 0 };
1913
1414
AvahiSServiceBrowser *sb = NULL;
1914
error_t ret_errno;
1415
int error;
1915
1416
int ret;
1916
1417
intmax_t tmpmax;
1917
1418
char *tmp;
1918
1419
int exitcode = EXIT_SUCCESS;
1919
char *interfaces_to_take_down = NULL;
1920
size_t interfaces_to_take_down_size = 0;
1921
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1922
char old_tempdir[] = "/tmp/mandosXXXXXX";
1923
char *tempdir = NULL;
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;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
1924
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1925
1429
const char *seckey = PATHDIR "/" SECKEY;
1926
1430
const char *pubkey = PATHDIR "/" PUBKEY;
1927
char *interfaces_hooks = NULL;
1928
1431
1929
1432
bool gnutls_initialized = false;
1930
1433
bool gpgme_initialized = false;
1992
1495
.group = 2 },
1993
1496
{ .name = "retry", .key = 132,
1994
1497
.arg = "SECONDS",
1995
.doc = "Retry interval used when denied by the Mandos server",
1498
.doc = "Retry interval used when denied by the mandos server",
1996
1499
.group = 2 },
1997
1500
{ .name = "network-hook-dir", .key = 133,
1998
1501
.arg = "DIR",
2021
1524
connect_to = arg;
2022
1525
break;
2023
1526
case 'i': /* --interface */
2024
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2025
arg, (int)',');
2026
if(ret_errno != 0){
2027
argp_error(state, "%s", strerror(ret_errno));
2028
}
1527
interface = arg;
2029
1528
break;
2030
1529
case 's': /* --seckey */
2031
1530
seckey = arg;
2074
1573
argp_state_help(state, state->out_stream,
2075
1574
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2076
1575
case 'V': /* --version */
2077
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2078
1578
exit(argp_err_exit_status);
2079
1579
break;
2080
1580
default:
2107
1607
{
2108
1608
/* Work around Debian bug #633582:
2109
1609
<http://bugs.debian.org/633582> */
2110
2111
/* Re-raise privileges */
2112
ret_errno = raise_privileges();
2113
if(ret_errno != 0){
2114
errno = ret_errno;
2115
perror_plus("Failed to raise privileges");
1610
struct stat st;
1611
1612
/* 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");
2116
1675
} else {
2117
struct stat st;
2118
2119
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2120
int seckey_fd = open(seckey, O_RDONLY);
2121
if(seckey_fd == -1){
2122
perror_plus("open");
2123
} else {
2124
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2125
if(ret == -1){
2126
perror_plus("fstat");
2127
} else {
2128
if(S_ISREG(st.st_mode)
2129
and st.st_uid == 0 and st.st_gid == 0){
2130
ret = fchown(seckey_fd, uid, gid);
2131
if(ret == -1){
2132
perror_plus("fchown");
2133
}
2134
}
2135
}
2136
TEMP_FAILURE_RETRY(close(seckey_fd));
2137
}
2138
}
2139
2140
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2141
int pubkey_fd = open(pubkey, O_RDONLY);
2142
if(pubkey_fd == -1){
2143
perror_plus("open");
2144
} else {
2145
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2146
if(ret == -1){
2147
perror_plus("fstat");
2148
} else {
2149
if(S_ISREG(st.st_mode)
2150
and st.st_uid == 0 and st.st_gid == 0){
2151
ret = fchown(pubkey_fd, uid, gid);
2152
if(ret == -1){
2153
perror_plus("fchown");
2154
}
2155
}
2156
}
2157
TEMP_FAILURE_RETRY(close(pubkey_fd));
2158
}
2159
}
2160
2161
/* Lower privileges */
2162
ret_errno = lower_privileges();
2163
if(ret_errno != 0){
2164
errno = ret_errno;
2165
perror_plus("Failed to lower privileges");
2166
}
2167
}
2168
}
2169
2170
/* Remove invalid interface names (except "none") */
2171
{
2172
char *interface = NULL;
2173
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2174
interface))){
2175
if(strcmp(interface, "none") != 0
2176
and if_nametoindex(interface) == 0){
2177
if(interface[0] != '\0'){
2178
fprintf_plus(stderr, "Not using nonexisting interface"
2179
" \"%s\"\n", interface);
2180
}
2181
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2182
interface = NULL;
2183
}
2184
}
2185
}
2186
2187
/* Run network hooks */
2188
{
2189
if(mc.interfaces != NULL){
2190
interfaces_hooks = malloc(mc.interfaces_size);
2191
if(interfaces_hooks == NULL){
2192
perror_plus("malloc");
2193
goto end;
2194
}
2195
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2196
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2197
}
2198
run_network_hooks("start", interfaces_hooks != NULL ?
2199
interfaces_hooks : "", delay);
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("MODE", "start", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
char *delaystring;
1707
ret = asprintf(&delaystring, "%f", delay);
1708
if(ret == -1){
1709
perror_plus("asprintf");
1710
exit(1);
1711
}
1712
ret = setenv("DELAY", delaystring, 1);
1713
if(ret == -1){
1714
free(delaystring);
1715
perror_plus("setenv");
1716
exit(1);
1717
}
1718
free(delaystring);
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1721
} else {
1722
int status;
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1725
free(fullname);
1726
continue;
1727
}
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1734
free(fullname);
1735
continue;
1736
}
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1741
WTERMSIG(status));
1742
free(fullname);
1743
continue;
1744
} else {
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
1747
direntry->d_name);
1748
free(fullname);
1749
continue;
1750
}
1751
}
1752
free(fullname);
1753
if(quit_now){
1754
goto end;
1755
}
1756
}
1757
close(devnull);
1758
}
2200
1759
}
2201
1760
2202
1761
if(not debug){
2203
1762
avahi_set_log_function(empty_log);
2204
1763
}
2205
1764
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1769
alphasort);
1770
if(ret == 0){
1771
/* No up interfaces, look for any good interfaces */
1772
free(direntries);
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1774
alphasort);
1775
}
1776
if(ret >= 1){
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1779
if(debug){
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1782
}
1783
if(interface == NULL){
1784
perror_plus("malloc");
1785
free(direntries);
1786
exitcode = EXIT_FAILURE;
1787
goto end;
1788
}
1789
free(direntries);
1790
} else {
1791
free(direntries);
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1795
goto end;
1796
}
1797
}
1798
2206
1799
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2207
1800
from the signal handler */
2208
1801
/* Initialize the pseudo-RNG for Avahi */
2209
1802
srand((unsigned int) time(NULL));
2210
simple_poll = avahi_simple_poll_new();
2211
if(simple_poll == NULL){
2212
fprintf_plus(stderr,
2213
"Avahi: Failed to create simple poll object.\n");
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
2214
1807
exitcode = EX_UNAVAILABLE;
2215
1808
goto end;
2216
1809
}
2278
1871
}
2279
1872
}
2280
1873
2281
/* If no interfaces were specified, make a list */
2282
if(mc.interfaces == NULL){
2283
struct dirent **direntries;
2284
/* Look for any good interfaces */
2285
ret = scandir(sys_class_net, &direntries, good_interface,
2286
alphasort);
2287
if(ret >= 1){
2288
/* Add all found interfaces to interfaces list */
2289
for(int i = 0; i < ret; ++i){
2290
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2291
direntries[i]->d_name);
2292
if(ret_errno != 0){
2293
errno = ret_errno;
2294
perror_plus("argz_add");
2295
continue;
2296
}
2297
if(debug){
2298
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2299
direntries[i]->d_name);
2300
}
2301
}
2302
free(direntries);
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1877
if(if_index == 0){
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1881
goto end;
1882
}
1883
1884
if(quit_now){
1885
goto end;
1886
}
1887
1888
/* Re-raise priviliges */
1889
errno = 0;
1890
ret = seteuid(0);
1891
if(ret == -1){
1892
perror_plus("seteuid");
1893
}
1894
1895
#ifdef __linux__
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1900
if(ret == -1){
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1903
}
1904
#endif /* __linux__ */
1905
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1907
if(sd < 0){
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1910
#ifdef __linux__
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1913
if(ret == -1){
1914
perror_plus("klogctl");
1915
}
1916
}
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1928
if(ret == -1){
1929
perror_plus("ioctl SIOCGIFFLAGS");
1930
#ifdef __linux__
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1933
if(ret == -1){
1934
perror_plus("klogctl");
1935
}
1936
}
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1940
errno = 0;
1941
ret = seteuid(uid);
1942
if(ret == -1){
1943
perror_plus("seteuid");
1944
}
1945
goto end;
1946
}
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1951
if(ret == -1){
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1955
#ifdef __linux__
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1958
if(ret == -1){
1959
perror_plus("klogctl");
1960
}
1961
}
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1964
errno = 0;
1965
ret = seteuid(uid);
1966
if(ret == -1){
1967
perror_plus("seteuid");
1968
}
1969
goto end;
1970
}
1971
}
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1976
if(ret == -1){
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
1979
break;
1980
}
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1985
}
1986
}
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1990
if(ret == -1){
1991
perror_plus("close");
1992
}
1993
}
1994
#ifdef __linux__
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1998
if(ret == -1){
1999
perror_plus("klogctl");
2000
}
2001
}
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2004
errno = 0;
2005
if(take_down_interface){
2006
/* Lower privileges */
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2303
2011
} else {
2304
free(direntries);
2305
fprintf_plus(stderr, "Could not find a network interface\n");
2306
exitcode = EXIT_FAILURE;
2307
goto end;
2308
}
2309
}
2310
2311
/* Bring up interfaces which are down, and remove any "none"s */
2312
{
2313
char *interface = NULL;
2314
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2315
interface))){
2316
/* If interface name is "none", stop bringing up interfaces.
2317
Also remove all instances of "none" from the list */
2318
if(strcmp(interface, "none") == 0){
2319
argz_delete(&mc.interfaces, &mc.interfaces_size,
2320
interface);
2321
interface = NULL;
2322
while((interface = argz_next(mc.interfaces,
2323
mc.interfaces_size, interface))){
2324
if(strcmp(interface, "none") == 0){
2325
argz_delete(&mc.interfaces, &mc.interfaces_size,
2326
interface);
2327
interface = NULL;
2328
}
2329
}
2330
break;
2331
}
2332
bool interface_was_up = interface_is_up(interface);
2333
errno = bring_up_interface(interface, delay);
2334
if(not interface_was_up){
2335
if(errno != 0){
2336
perror_plus("Failed to bring up interface");
2337
} else {
2338
errno = argz_add(&interfaces_to_take_down,
2339
&interfaces_to_take_down_size,
2340
interface);
2341
if(errno != 0){
2342
perror_plus("argz_add");
2343
}
2344
}
2345
}
2346
}
2347
if(debug and (interfaces_to_take_down == NULL)){
2348
fprintf_plus(stderr, "No interfaces were brought up\n");
2349
}
2350
}
2351
2352
/* If we only got one interface, explicitly use only that one */
2353
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2354
if(debug){
2355
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2356
mc.interfaces);
2357
}
2358
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
/* Lower privileges permanently */
2013
ret = setuid(uid);
2014
if(ret == -1){
2015
perror_plus("setuid");
2016
}
2017
}
2359
2018
}
2360
2019
2361
2020
if(quit_now){
2362
2021
goto end;
2363
2022
}
2364
2023
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2024
ret = init_gnutls_global(pubkey, seckey);
2366
2025
if(ret == -1){
2367
fprintf_plus(stderr, "init_gnutls_global failed\n");
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2368
2028
exitcode = EX_UNAVAILABLE;
2369
2029
goto end;
2370
2030
} else {
2375
2035
goto end;
2376
2036
}
2377
2037
2378
/* Try /run/tmp before /tmp */
2379
tempdir = mkdtemp(run_tempdir);
2380
if(tempdir == NULL and errno == ENOENT){
2381
if(debug){
2382
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2383
run_tempdir, old_tempdir);
2384
}
2385
tempdir = mkdtemp(old_tempdir);
2386
}
2387
if(tempdir == NULL){
2038
if(mkdtemp(tempdir) == NULL){
2388
2039
perror_plus("mkdtemp");
2389
2040
goto end;
2390
2041
}
2042
tempdir_created = true;
2391
2043
2392
2044
if(quit_now){
2393
2045
goto end;
2394
2046
}
2395
2047
2396
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2397
fprintf_plus(stderr, "init_gpgme failed\n");
2048
if(not init_gpgme(pubkey, seckey, tempdir)){
2049
fprintf(stderr, "Mandos plugin mandos-client: "
2050
"init_gpgme failed\n");
2398
2051
exitcode = EX_UNAVAILABLE;
2399
2052
goto end;
2400
2053
} else {
2409
2062
/* Connect directly, do not use Zeroconf */
2410
2063
/* (Mainly meant for debugging) */
2411
2064
char *address = strrchr(connect_to, ':');
2412
2413
2065
if(address == NULL){
2414
fprintf_plus(stderr, "No colon in address\n");
2066
fprintf(stderr, "Mandos plugin mandos-client: "
2067
"No colon in address\n");
2415
2068
exitcode = EX_USAGE;
2416
2069
goto end;
2417
2070
}
2420
2073
goto end;
2421
2074
}
2422
2075
2423
in_port_t port;
2076
uint16_t port;
2424
2077
errno = 0;
2425
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2426
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2427
or tmpmax != (in_port_t)tmpmax){
2428
fprintf_plus(stderr, "Bad port number\n");
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf(stderr, "Mandos plugin mandos-client: "
2082
"Bad port number\n");
2429
2083
exitcode = EX_USAGE;
2430
2084
goto end;
2431
2085
}
2432
2086
2433
2087
if(quit_now){
2434
2088
goto end;
2435
2089
}
2436
2090
2437
port = (in_port_t)tmpmax;
2091
port = (uint16_t)tmpmax;
2438
2092
*address = '\0';
2439
2093
/* Colon in address indicates IPv6 */
2440
2094
int af;
2456
2110
}
2457
2111
2458
2112
while(not quit_now){
2459
ret = start_mandos_communication(address, port, if_index, af,
2460
&mc);
2113
ret = start_mandos_communication(address, port, if_index, af);
2461
2114
if(quit_now or ret == 0){
2462
2115
break;
2463
2116
}
2464
2117
if(debug){
2465
fprintf_plus(stderr, "Retrying in %d seconds\n",
2466
(int)retry_interval);
2118
fprintf(stderr, "Mandos plugin mandos-client: "
2119
"Retrying in %d seconds\n", (int)retry_interval);
2467
2120
}
2468
sleep((unsigned int)retry_interval);
2121
sleep((int)retry_interval);
2469
2122
}
2470
2123
2471
if(not quit_now){
2124
if (not quit_now){
2472
2125
exitcode = EXIT_SUCCESS;
2473
2126
}
2474
2127
2489
2142
config.publish_domain = 0;
2490
2143
2491
2144
/* Allocate a new server */
2492
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2493
&config, NULL, NULL, &ret_errno);
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2147
NULL, &error);
2494
2148
2495
2149
/* Free the Avahi configuration data */
2496
2150
avahi_server_config_free(&config);
2498
2152
2499
2153
/* Check if creating the Avahi server object succeeded */
2500
2154
if(mc.server == NULL){
2501
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2502
avahi_strerror(ret_errno));
2155
fprintf(stderr, "Mandos plugin mandos-client: "
2156
"Failed to create Avahi server: %s\n",
2157
avahi_strerror(error));
2503
2158
exitcode = EX_UNAVAILABLE;
2504
2159
goto end;
2505
2160
}
2511
2166
/* Create the Avahi service browser */
2512
2167
sb = avahi_s_service_browser_new(mc.server, if_index,
2513
2168
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2514
NULL, 0, browse_callback,
2515
(void *)&mc);
2169
NULL, 0, browse_callback, NULL);
2516
2170
if(sb == NULL){
2517
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2518
avahi_strerror(avahi_server_errno(mc.server)));
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"Failed to create service browser: %s\n",
2173
avahi_strerror(avahi_server_errno(mc.server)));
2519
2174
exitcode = EX_UNAVAILABLE;
2520
2175
goto end;
2521
2176
}
2527
2182
/* Run the main loop */
2528
2183
2529
2184
if(debug){
2530
fprintf_plus(stderr, "Starting Avahi loop search\n");
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2531
2187
}
2532
2533
ret = avahi_loop_with_timeout(simple_poll,
2534
(int)(retry_interval * 1000), &mc);
2188
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2535
2191
if(debug){
2536
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2537
(ret == 0) ? "successfully" : "with error");
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2538
2195
}
2539
2196
2540
2197
end:
2541
2198
2542
2199
if(debug){
2543
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2544
2202
}
2545
2203
2546
2204
/* Cleanup things */
2547
free(mc.interfaces);
2548
2549
2205
if(sb != NULL)
2550
2206
avahi_s_service_browser_free(sb);
2551
2207
2552
2208
if(mc.server != NULL)
2553
2209
avahi_server_free(mc.server);
2554
2210
2555
if(simple_poll != NULL)
2556
avahi_simple_poll_free(simple_poll);
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2557
2213
2558
2214
if(gnutls_initialized){
2559
2215
gnutls_certificate_free_credentials(mc.cred);
2564
2220
if(gpgme_initialized){
2565
2221
gpgme_release(mc.ctx);
2566
2222
}
2567
2223
2568
2224
/* Cleans up the circular linked list of Mandos servers the client
2569
2225
has seen */
2570
2226
if(mc.current_server != NULL){
2576
2232
}
2577
2233
}
2578
2234
2579
/* Re-raise privileges */
2580
{
2581
ret_errno = raise_privileges();
2582
if(ret_errno != 0){
2583
perror_plus("Failed to raise privileges");
2584
} else {
2585
2586
/* Run network hooks */
2587
run_network_hooks("stop", interfaces_hooks != NULL ?
2588
interfaces_hooks : "", delay);
2589
2590
/* Take down the network interfaces which were brought up */
2591
{
2592
char *interface = NULL;
2593
while((interface=argz_next(interfaces_to_take_down,
2594
interfaces_to_take_down_size,
2595
interface))){
2596
ret_errno = take_down_interface(interface);
2597
if(ret_errno != 0){
2598
errno = ret_errno;
2599
perror_plus("Failed to take down interface");
2600
}
2601
}
2602
if(debug and (interfaces_to_take_down == NULL)){
2603
fprintf_plus(stderr, "No interfaces needed to be taken"
2604
" down\n");
2605
}
2606
}
2235
/* XXX run network hooks "stop" here */
2236
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2240
errno = 0;
2241
ret = seteuid(0);
2242
if(ret == -1){
2243
perror_plus("seteuid");
2607
2244
}
2608
2609
ret_errno = lower_privileges_permanently();
2610
if(ret_errno != 0){
2611
perror_plus("Failed to lower privileges permanently");
2245
if(geteuid() == 0){
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2254
}
2255
}
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2257
if(ret == -1){
2258
perror_plus("close");
2259
}
2260
/* Lower privileges permanently */
2261
errno = 0;
2262
ret = setuid(uid);
2263
if(ret == -1){
2264
perror_plus("setuid");
2265
}
2612
2266
}
2613
2267
}
2614
2268
2615
free(interfaces_to_take_down);
2616
free(interfaces_hooks);
2617
2618
2269
/* Removes the GPGME temp directory and all files inside */
2619
if(tempdir != NULL){
2270
if(tempdir_created){
2620
2271
struct dirent **direntries = NULL;
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2624
} else {
2625
#ifdef __GLIBC__
2626
#if __GLIBC_PREREQ(2, 15)
2627
int numentries = scandirat(tempdir_fd, ".", &direntries,
2628
notdotentries, alphasort);
2629
#else /* not __GLIBC_PREREQ(2, 15) */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2631
alphasort);
2632
#endif /* not __GLIBC_PREREQ(2, 15) */
2633
#else /* not __GLIBC__ */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC__ */
2637
if(numentries > 0){
2638
for(int i = 0; i < numentries; i++){
2639
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2640
if(ret == -1){
2641
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2642
" \"%s\", 0): %s\n", tempdir,
2643
direntries[i]->d_name, strerror(errno));
2644
}
2645
}
2646
2647
/* need to clean even if 0 because man page doesn't specify */
2648
free(direntries);
2649
if(numentries == -1){
2650
perror_plus("scandir");
2651
}
2652
ret = rmdir(tempdir);
2653
if(ret == -1 and errno != ENOENT){
2654
perror_plus("rmdir");
2655
}
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2274
alphasort);
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
2278
char *fullname = NULL;
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
2280
direntry->d_name);
2281
if(ret < 0){
2282
perror_plus("asprintf");
2283
continue;
2284
}
2285
ret = remove(fullname);
2286
if(ret == -1){
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2289
}
2290
free(fullname);
2656
2291
}
2657
TEMP_FAILURE_RETRY(close(tempdir_fd));
2292
}
2293
2294
/* need to clean even if 0 because man page doesn't specify */
2295
free(direntries);
2296
if (numentries == -1){
2297
perror_plus("scandir");
2298
}
2299
ret = rmdir(tempdir);
2300
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");
2658
2302
}
2659
2303
}
2660
2304
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0