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- Committer: teddy at bsnet
- Date: 2011-11-11 15:05:27 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-20111111150527-hdlgk1hkubtbth10
* plugins.d/mandos-client.c (good_interface): Add error message.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
(up_interface): Use get_flags() and good_flags(). Also check the
IFF_RUNNING flags.
(runnable_hook): Bug fix: Add NULL to execl() call.
(main): Use network interfaces which are up and running in
preference to any other interfaces.
- 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,
86
85
raise() */
87
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
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
88
99
89
#ifdef __linux__
100
90
#include <sys/klog.h> /* klogctl() */
118
108
init_gnutls_session(),
119
109
GNUTLS_* */
120
110
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
123
113
124
114
/* GPGME */
125
115
#include <gpgme.h> /* All GPGME types, constants and
141
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
132
static const char sys_class_net[] = "/sys/class/net";
143
133
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
134
149
135
/* Doubly linked list that need to be circularly linked when used */
150
136
typedef struct server{
151
137
const char *ip;
152
in_port_t port;
138
uint16_t port;
153
139
AvahiIfIndex if_index;
154
140
int af;
155
141
struct timespec last_seen;
159
145
160
146
/* Used for passing in values through the Avahi callback functions */
161
147
typedef struct {
148
AvahiSimplePoll *simple_poll;
162
149
AvahiServer *server;
163
150
gnutls_certificate_credentials_t cred;
164
151
unsigned int dh_bits;
166
153
const char *priority;
167
154
gpgme_ctx_t ctx;
168
155
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
156
} mandos_context;
172
157
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
175
163
176
164
sig_atomic_t quit_now = 0;
177
165
int signal_received = 0;
178
166
179
167
/* Function to use when printing errors */
180
168
void perror_plus(const char *print_text){
181
int e = errno;
182
169
fprintf(stderr, "Mandos plugin %s: ",
183
170
program_invocation_short_name);
184
errno = e;
185
171
perror(print_text);
186
172
}
187
173
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
174
/*
199
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
176
* bytes. "buffer_capacity" is how much is currently allocated,
201
177
* "buffer_length" is how much is already used.
202
178
*/
203
__attribute__((nonnull, warn_unused_result))
204
179
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
180
size_t buffer_capacity){
206
181
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;
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
213
184
return 0;
214
185
}
215
*buffer = new_buf;
216
186
buffer_capacity += BUFFER_SIZE;
217
187
}
218
188
return buffer_capacity;
219
189
}
220
190
221
191
/* 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){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
225
195
int ret;
226
196
server *new_server = malloc(sizeof(server));
227
197
if(new_server == NULL){
228
198
perror_plus("malloc");
229
return false;
199
return -1;
230
200
}
231
201
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
202
.port = port,
203
.if_index = if_index,
204
.af = af };
235
205
if(new_server->ip == NULL){
236
206
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
207
return -1;
253
208
}
254
209
/* Special case of first server */
255
if(*current_server == NULL){
210
if (mc.current_server == NULL){
256
211
new_server->next = new_server;
257
212
new_server->prev = new_server;
258
*current_server = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
259
215
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
263
218
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
267
227
}
268
228
269
229
/*
270
230
* Initialize GPGME.
271
231
*/
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
277
234
gpgme_error_t rc;
278
235
gpgme_engine_info_t engine_info;
279
236
237
280
238
/*
281
239
* Helper function to insert pub and seckey to the engine keyring.
282
240
*/
283
bool import_key(const char * const filename){
241
bool import_key(const char *filename){
284
242
int ret;
285
243
int fd;
286
244
gpgme_data_t pgp_data;
293
251
294
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
253
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
298
256
return false;
299
257
}
300
258
301
rc = gpgme_op_import(mc->ctx, pgp_data);
259
rc = gpgme_op_import(mc.ctx, pgp_data);
302
260
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
305
263
return false;
306
264
}
307
265
314
272
}
315
273
316
274
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
275
fprintf(stderr, "Initializing GPGME\n");
318
276
}
319
277
320
278
/* Init GPGME */
321
279
gpgme_check_version(NULL);
322
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
281
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
326
284
return false;
327
285
}
328
286
329
287
/* Set GPGME home directory for the OpenPGP engine only */
330
288
rc = gpgme_get_engine_info(&engine_info);
331
289
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
334
292
return false;
335
293
}
336
294
while(engine_info != NULL){
342
300
engine_info = engine_info->next;
343
301
}
344
302
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
304
return false;
348
305
}
349
306
350
307
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
308
rc = gpgme_new(&(mc.ctx));
352
309
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
356
312
return false;
357
313
}
358
314
367
323
* Decrypt OpenPGP data.
368
324
* Returns -1 on error
369
325
*/
370
__attribute__((nonnull, warn_unused_result))
371
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
327
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
328
char **plaintext){
375
329
gpgme_data_t dh_crypto, dh_plain;
376
330
gpgme_error_t rc;
377
331
ssize_t ret;
379
333
ssize_t plaintext_length = 0;
380
334
381
335
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
337
}
384
338
385
339
/* Create new GPGME data buffer from memory cryptotext */
386
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
341
0);
388
342
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
391
345
return -1;
392
346
}
393
347
394
348
/* Create new empty GPGME data buffer for the plaintext */
395
349
rc = gpgme_data_new(&dh_plain);
396
350
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
400
353
gpgme_data_release(dh_crypto);
401
354
return -1;
402
355
}
403
356
404
357
/* Decrypt data from the cryptotext data buffer to the plaintext
405
358
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
360
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
410
363
plaintext_length = -1;
411
364
if(debug){
412
365
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
414
367
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
369
} else {
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
421
374
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
423
376
}
424
377
gpgme_recipient_t recipient;
425
378
recipient = result->recipients;
426
379
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
434
386
recipient = recipient->next;
435
387
}
436
388
}
439
391
}
440
392
441
393
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
395
}
444
396
445
397
/* Seek back to the beginning of the GPGME plaintext data buffer */
452
404
*plaintext = NULL;
453
405
while(true){
454
406
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
407
(size_t)plaintext_length,
408
plaintext_capacity);
457
409
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
461
413
}
462
414
463
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
476
428
}
477
429
478
430
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
431
fprintf(stderr, "Decrypted password is: ");
480
432
for(ssize_t i = 0; i < plaintext_length; i++){
481
433
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
434
}
493
445
return plaintext_length;
494
446
}
495
447
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
499
451
if(ret == NULL)
500
452
ret = "(unknown)";
501
453
return ret;
502
454
}
503
455
504
456
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
457
static void debuggnutls(__attribute__((unused)) int level,
507
458
const char* string){
508
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
509
460
}
510
461
511
__attribute__((nonnull, warn_unused_result))
512
462
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
463
const char *seckeyfilename){
515
464
int ret;
516
465
517
466
if(debug){
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
519
468
}
520
469
521
470
ret = gnutls_global_init();
522
471
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
525
474
return -1;
526
475
}
527
476
534
483
}
535
484
536
485
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
487
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
541
490
gnutls_global_deinit();
542
491
return -1;
543
492
}
544
493
545
494
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
550
498
}
551
499
552
500
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
554
502
GNUTLS_OPENPGP_FMT_BASE64);
555
503
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
561
509
goto globalfail;
562
510
}
563
511
564
512
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
566
514
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
570
517
goto globalfail;
571
518
}
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
520
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
576
523
goto globalfail;
577
524
}
578
525
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
580
527
581
528
return 0;
582
529
583
530
globalfail:
584
531
585
gnutls_certificate_free_credentials(mc->cred);
532
gnutls_certificate_free_credentials(mc.cred);
586
533
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
534
gnutls_dh_params_deinit(mc.dh_params);
588
535
return -1;
589
536
}
590
537
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
538
static int init_gnutls_session(gnutls_session_t *session){
594
539
int ret;
595
540
/* GnuTLS session creation */
596
541
do {
600
545
}
601
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
547
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
606
550
}
607
551
608
552
{
609
553
const char *err;
610
554
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
612
556
if(quit_now){
613
557
gnutls_deinit(*session);
614
558
return -1;
615
559
}
616
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
617
561
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
621
565
gnutls_deinit(*session);
622
566
return -1;
623
567
}
625
569
626
570
do {
627
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
572
mc.cred);
629
573
if(quit_now){
630
574
gnutls_deinit(*session);
631
575
return -1;
632
576
}
633
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
634
578
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
637
581
gnutls_deinit(*session);
638
582
return -1;
639
583
}
641
585
/* ignore client certificate if any. */
642
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
643
587
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
645
589
646
590
return 0;
647
591
}
651
595
__attribute__((unused)) const char *txt){}
652
596
653
597
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
656
599
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
600
int af){
658
601
int ret, tcp_sd = -1;
659
602
ssize_t sret;
660
struct sockaddr_storage to;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
661
607
char *buffer = NULL;
662
608
char *decrypted_buffer = NULL;
663
609
size_t buffer_length = 0;
682
628
pf = PF_INET;
683
629
break;
684
630
default:
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
686
632
errno = EINVAL;
687
633
return -1;
688
634
}
689
635
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
636
ret = init_gnutls_session(&session);
723
637
if(ret != 0){
724
638
return -1;
725
639
}
726
640
727
641
if(debug){
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
730
644
}
731
645
732
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
744
658
745
659
memset(&to, 0, sizeof(to));
746
660
if(af == AF_INET6){
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
749
663
} else { /* IPv4 */
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
752
666
}
753
667
if(ret < 0 ){
754
668
int e = errno;
758
672
}
759
673
if(ret == 0){
760
674
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
fprintf(stderr, "Bad address: %s\n", ip);
762
676
errno = e;
763
677
goto mandos_end;
764
678
}
765
679
if(af == AF_INET6){
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
769
687
if(if_index == AVAHI_IF_UNSPEC){
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
772
690
errno = EINVAL;
773
691
goto mandos_end;
774
692
}
775
693
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
to.in6.sin6_scope_id = (uint32_t)if_index;
777
695
}
778
696
} else {
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
780
700
}
781
701
782
702
if(quit_now){
790
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
711
perror_plus("if_indextoname");
792
712
} else {
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
795
715
}
796
716
} else {
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
799
719
}
800
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
802
723
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
807
726
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
812
729
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
819
736
}
820
737
}
821
738
825
742
}
826
743
827
744
if(af == AF_INET6){
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
830
746
} else {
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
833
748
}
834
749
if(ret < 0){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
751
int e = errno;
837
752
perror_plus("connect");
838
753
errno = e;
850
765
while(true){
851
766
size_t out_size = strlen(out);
852
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
853
out_size - written));
768
out_size - written));
854
769
if(ret == -1){
855
770
int e = errno;
856
771
perror_plus("write");
876
791
}
877
792
878
793
if(debug){
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
880
795
}
881
796
882
797
if(quit_now){
884
799
goto mandos_end;
885
800
}
886
801
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
892
804
893
805
if(quit_now){
894
806
errno = EINTR;
905
817
906
818
if(ret != GNUTLS_E_SUCCESS){
907
819
if(debug){
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
909
821
gnutls_perror(ret);
910
822
}
911
823
errno = EPROTO;
915
827
/* Read OpenPGP packet that contains the wanted password */
916
828
917
829
if(debug){
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
920
832
}
921
833
922
834
while(true){
927
839
}
928
840
929
841
buffer_capacity = incbuffer(&buffer, buffer_length,
930
buffer_capacity);
842
buffer_capacity);
931
843
if(buffer_capacity == 0){
932
844
int e = errno;
933
845
perror_plus("incbuffer");
960
872
}
961
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
962
874
if(ret < 0){
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
965
876
gnutls_perror(ret);
966
877
errno = EPROTO;
967
878
goto mandos_end;
968
879
}
969
880
break;
970
881
default:
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
973
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
885
errno = EIO;
975
886
goto mandos_end;
980
891
}
981
892
982
893
if(debug){
983
fprintf_plus(stderr, "Closing TLS session\n");
894
fprintf(stderr, "Closing TLS session\n");
984
895
}
985
896
986
897
if(quit_now){
998
909
999
910
if(buffer_length > 0){
1000
911
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1003
915
if(decrypted_buffer_size >= 0){
1004
916
1005
917
written = 0;
1015
927
if(ret == 0 and ferror(stdout)){
1016
928
int e = errno;
1017
929
if(debug){
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1020
932
}
1021
933
errno = e;
1022
934
goto mandos_end;
1053
965
return retval;
1054
966
}
1055
967
1056
__attribute__((nonnull))
1057
968
static void resolve_callback(AvahiSServiceResolver *r,
1058
969
AvahiIfIndex interface,
1059
970
AvahiProtocol proto,
1067
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
1068
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1069
980
flags,
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1074
983
1075
984
/* Called whenever a service has been resolved successfully or
1076
985
timed out */
1082
991
switch(event){
1083
992
default:
1084
993
case AVAHI_RESOLVER_FAILURE:
1085
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1086
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1087
domain,
1088
avahi_strerror(avahi_server_errno
1089
(((mandos_context*)mc)->server)));
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1090
997
break;
1091
998
1092
999
case AVAHI_RESOLVER_FOUND:
1094
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1095
1002
avahi_address_snprint(ip, sizeof(ip), address);
1096
1003
if(debug){
1097
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1098
PRIdMAX ") on port %" PRIu16 "\n", name,
1099
host_name, ip, (intmax_t)interface, port);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1100
1007
}
1101
int ret = start_mandos_communication(ip, (in_port_t)port,
1102
interface,
1103
avahi_proto_to_af(proto),
1104
mc);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1105
1010
if(ret == 0){
1106
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1107
1012
} else {
1108
if(not add_server(ip, (in_port_t)port, interface,
1109
avahi_proto_to_af(proto),
1110
&((mandos_context*)mc)->current_server)){
1111
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1112
" list\n", name);
1113
}
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1114
1015
}
1115
1016
}
1116
1017
}
1126
1027
const char *domain,
1127
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1128
1029
flags,
1129
void *mc){
1130
if(b == NULL){
1131
return;
1132
}
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1133
1032
1134
1033
/* Called whenever a new services becomes available on the LAN or
1135
1034
is removed from the LAN */
1142
1041
default:
1143
1042
case AVAHI_BROWSER_FAILURE:
1144
1043
1145
fprintf_plus(stderr, "(Avahi browser) %s\n",
1146
avahi_strerror(avahi_server_errno
1147
(((mandos_context*)mc)->server)));
1148
avahi_simple_poll_quit(simple_poll);
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1149
1047
return;
1150
1048
1151
1049
case AVAHI_BROWSER_NEW:
1154
1052
the callback function is called the Avahi server will free the
1155
1053
resolver for us. */
1156
1054
1157
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1158
interface, protocol, name, type,
1159
domain, protocol, 0,
1160
resolve_callback, mc) == NULL)
1161
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1162
" %s\n", name,
1163
avahi_strerror(avahi_server_errno
1164
(((mandos_context*)mc)->server)));
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1165
1060
break;
1166
1061
1167
1062
case AVAHI_BROWSER_REMOVE:
1170
1065
case AVAHI_BROWSER_ALL_FOR_NOW:
1171
1066
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1172
1067
if(debug){
1173
fprintf_plus(stderr, "No Mandos server found, still"
1174
" searching...\n");
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1175
1069
}
1176
1070
break;
1177
1071
}
1186
1080
signal_received = sig;
1187
1081
int old_errno = errno;
1188
1082
/* set main loop to exit */
1189
if(simple_poll != NULL){
1190
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1191
1085
}
1192
1086
errno = old_errno;
1193
1087
}
1194
1088
1195
__attribute__((nonnull, warn_unused_result))
1196
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1197
1090
int ret;
1198
error_t ret_errno;
1199
1091
1200
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
1093
if(s < 0){
1202
ret_errno = errno;
1203
1094
perror_plus("socket");
1204
errno = ret_errno;
1205
1095
return false;
1206
1096
}
1207
1097
strcpy(ifr->ifr_name, ifname);
1208
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1209
1099
if(ret == -1){
1210
1100
if(debug){
1211
ret_errno = errno;
1212
1101
perror_plus("ioctl SIOCGIFFLAGS");
1213
errno = ret_errno;
1214
1102
}
1215
1103
return false;
1216
1104
}
1217
1105
return true;
1218
1106
}
1219
1107
1220
__attribute__((nonnull, warn_unused_result))
1221
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1222
1109
1223
1110
/* Reject the loopback device */
1224
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1225
1112
if(debug){
1226
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1227
ifname);
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1228
1115
}
1229
1116
return false;
1230
1117
}
1231
1118
/* Accept point-to-point devices only if connect_to is specified */
1232
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1233
1120
if(debug){
1234
fprintf_plus(stderr, "Accepting point-to-point interface"
1235
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1236
1123
}
1237
1124
return true;
1238
1125
}
1239
1126
/* Otherwise, reject non-broadcast-capable devices */
1240
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1241
1128
if(debug){
1242
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1243
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1244
1131
}
1245
1132
return false;
1246
1133
}
1247
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1248
1135
if(ifr->ifr_flags & IFF_NOARP){
1249
1136
if(debug){
1250
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1251
ifname);
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1252
1138
}
1253
1139
return false;
1254
1140
}
1255
1141
1256
1142
/* Accept this device */
1257
1143
if(debug){
1258
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1259
1145
}
1260
1146
return true;
1261
1147
}
1265
1151
* corresponds to an acceptable network device.
1266
1152
* (This function is passed to scandir(3) as a filter function.)
1267
1153
*/
1268
__attribute__((nonnull, warn_unused_result))
1269
1154
int good_interface(const struct dirent *if_entry){
1270
1155
if(if_entry->d_name[0] == '.'){
1271
1156
return 0;
1274
1159
struct ifreq ifr;
1275
1160
if(not get_flags(if_entry->d_name, &ifr)){
1276
1161
if(debug){
1277
fprintf_plus(stderr, "Failed to get flags for interface "
1278
"\"%s\"\n", if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
1283
if(not good_flags(if_entry->d_name, &ifr)){
1284
return 0;
1285
}
1286
return 1;
1287
}
1288
1289
/*
1290
* This function determines if a network interface is up.
1291
*/
1292
__attribute__((nonnull, warn_unused_result))
1293
bool interface_is_up(const char *interface){
1294
struct ifreq ifr;
1295
if(not get_flags(interface, &ifr)){
1296
if(debug){
1297
fprintf_plus(stderr, "Failed to get flags for interface "
1298
"\"%s\"\n", interface);
1299
}
1300
return false;
1301
}
1302
1303
return (bool)(ifr.ifr_flags & IFF_UP);
1304
}
1305
1306
/*
1307
* This function determines if a network interface is running
1308
*/
1309
__attribute__((nonnull, warn_unused_result))
1310
bool interface_is_running(const char *interface){
1311
struct ifreq ifr;
1312
if(not get_flags(interface, &ifr)){
1313
if(debug){
1314
fprintf_plus(stderr, "Failed to get flags for interface "
1315
"\"%s\"\n", interface);
1316
}
1317
return false;
1318
}
1319
1320
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1321
}
1322
1323
__attribute__((nonnull, pure, warn_unused_result))
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1324
1217
int notdotentries(const struct dirent *direntry){
1325
1218
/* Skip "." and ".." */
1326
1219
if(direntry->d_name[0] == '.'
1333
1226
}
1334
1227
1335
1228
/* Is this directory entry a runnable program? */
1336
__attribute__((nonnull, warn_unused_result))
1337
1229
int runnable_hook(const struct dirent *direntry){
1338
1230
int ret;
1339
size_t sret;
1340
1231
struct stat st;
1341
1232
1342
1233
if((direntry->d_name)[0] == '\0'){
1344
1235
return 0;
1345
1236
}
1346
1237
1347
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1348
"abcdefghijklmnopqrstuvwxyz"
1349
"0123456789"
1350
"_.-");
1351
if((direntry->d_name)[sret] != '\0'){
1352
/* Contains non-allowed characters */
1353
if(debug){
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1355
direntry->d_name);
1356
}
1357
return 0;
1358
}
1359
1360
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1361
1255
if(ret == -1){
1362
1256
if(debug){
1363
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1364
1258
}
1365
1259
return 0;
1366
1260
}
1367
1261
if(not (S_ISREG(st.st_mode))){
1368
1262
/* Not a regular file */
1369
if(debug){
1370
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1371
direntry->d_name);
1372
}
1373
1263
return 0;
1374
1264
}
1375
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1376
1266
/* Not executable */
1377
if(debug){
1378
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1379
direntry->d_name);
1380
}
1381
1267
return 0;
1382
1268
}
1383
if(debug){
1384
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1385
direntry->d_name);
1386
}
1387
1269
return 1;
1388
1270
}
1389
1271
1390
__attribute__((nonnull, warn_unused_result))
1391
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1392
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1393
1273
int ret;
1394
1274
struct timespec now;
1395
1275
struct timespec waited_time;
1396
1276
intmax_t block_time;
1397
1277
1398
1278
while(true){
1399
if(mc->current_server == NULL){
1400
if(debug){
1401
fprintf_plus(stderr, "Wait until first server is found."
1402
" No timeout!\n");
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1403
1283
}
1404
1284
ret = avahi_simple_poll_iterate(s, -1);
1405
1285
} else {
1406
if(debug){
1407
fprintf_plus(stderr, "Check current_server if we should run"
1408
" it, or wait\n");
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1409
1289
}
1410
1290
/* the current time */
1411
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1416
1296
/* Calculating in ms how long time between now and server
1417
1297
who we visted longest time ago. Now - last seen. */
1418
1298
waited_time.tv_sec = (now.tv_sec
1419
- mc->current_server->last_seen.tv_sec);
1299
- mc.current_server->last_seen.tv_sec);
1420
1300
waited_time.tv_nsec = (now.tv_nsec
1421
- mc->current_server->last_seen.tv_nsec);
1301
- mc.current_server->last_seen.tv_nsec);
1422
1302
/* total time is 10s/10,000ms.
1423
1303
Converting to s from ms by dividing by 1,000,
1424
1304
and ns to ms by dividing by 1,000,000. */
1426
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1427
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1428
1308
1429
if(debug){
1430
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1431
block_time);
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1432
1311
}
1433
1312
1434
1313
if(block_time <= 0){
1435
ret = start_mandos_communication(mc->current_server->ip,
1436
mc->current_server->port,
1437
mc->current_server->if_index,
1438
mc->current_server->af, mc);
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1439
1318
if(ret == 0){
1440
avahi_simple_poll_quit(s);
1319
avahi_simple_poll_quit(mc.simple_poll);
1441
1320
return 0;
1442
1321
}
1443
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1444
&mc->current_server->last_seen);
1323
&mc.current_server->last_seen);
1445
1324
if(ret == -1){
1446
1325
perror_plus("clock_gettime");
1447
1326
return -1;
1448
1327
}
1449
mc->current_server = mc->current_server->next;
1328
mc.current_server = mc.current_server->next;
1450
1329
block_time = 0; /* Call avahi to find new Mandos
1451
1330
servers, but don't block */
1452
1331
}
1454
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1455
1334
}
1456
1335
if(ret != 0){
1457
if(ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1458
1337
return (ret != 1) ? ret : 0;
1459
1338
}
1460
1339
}
1461
1340
}
1462
1341
}
1463
1342
1464
/* Set effective uid to 0, return errno */
1465
__attribute__((warn_unused_result))
1466
error_t raise_privileges(void){
1467
error_t old_errno = errno;
1468
error_t ret_errno = 0;
1469
if(seteuid(0) == -1){
1470
ret_errno = errno;
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Set effective and real user ID to 0. Return errno. */
1477
__attribute__((warn_unused_result))
1478
error_t raise_privileges_permanently(void){
1479
error_t old_errno = errno;
1480
error_t ret_errno = raise_privileges();
1481
if(ret_errno != 0){
1482
errno = old_errno;
1483
return ret_errno;
1484
}
1485
if(setuid(0) == -1){
1486
ret_errno = errno;
1487
}
1488
errno = old_errno;
1489
return ret_errno;
1490
}
1491
1492
/* Set effective user ID to unprivileged saved user ID */
1493
__attribute__((warn_unused_result))
1494
error_t lower_privileges(void){
1495
error_t old_errno = errno;
1496
error_t ret_errno = 0;
1497
if(seteuid(uid) == -1){
1498
ret_errno = errno;
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
}
1512
errno = old_errno;
1513
return ret_errno;
1514
}
1515
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1518
const float delay){
1519
struct dirent **direntries = NULL;
1520
if(hookdir_fd == -1){
1521
hookdir_fd = open(hookdir, O_RDONLY);
1522
if(hookdir_fd == -1){
1523
if(errno == ENOENT){
1524
if(debug){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1527
}
1528
} else {
1529
perror_plus("open");
1530
}
1531
return;
1532
}
1533
}
1534
#ifdef __GLIBC__
1535
#if __GLIBC_PREREQ(2, 15)
1536
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1537
runnable_hook, alphasort);
1538
#else /* not __GLIBC_PREREQ(2, 15) */
1539
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1540
alphasort);
1541
#endif /* not __GLIBC_PREREQ(2, 15) */
1542
#else /* not __GLIBC__ */
1543
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1544
alphasort);
1545
#endif /* not __GLIBC__ */
1546
if(numhooks == -1){
1547
perror_plus("scandir");
1548
return;
1549
}
1550
struct dirent *direntry;
1551
int ret;
1552
int devnull = open("/dev/null", O_RDONLY);
1553
for(int i = 0; i < numhooks; i++){
1554
direntry = direntries[i];
1555
if(debug){
1556
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1557
direntry->d_name);
1558
}
1559
pid_t hook_pid = fork();
1560
if(hook_pid == 0){
1561
/* Child */
1562
/* Raise privileges */
1563
errno = raise_privileges_permanently();
1564
if(errno != 0){
1565
perror_plus("Failed to raise privileges");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Set group */
1569
errno = 0;
1570
ret = setgid(0);
1571
if(ret == -1){
1572
perror_plus("setgid");
1573
_exit(EX_NOPERM);
1574
}
1575
/* Reset supplementary groups */
1576
errno = 0;
1577
ret = setgroups(0, NULL);
1578
if(ret == -1){
1579
perror_plus("setgroups");
1580
_exit(EX_NOPERM);
1581
}
1582
ret = dup2(devnull, STDIN_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(devnull, STDIN_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = close(devnull);
1588
if(ret == -1){
1589
perror_plus("close");
1590
_exit(EX_OSERR);
1591
}
1592
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1593
if(ret == -1){
1594
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("DEVICE", interface, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1608
if(ret == -1){
1609
perror_plus("setenv");
1610
_exit(EX_OSERR);
1611
}
1612
ret = setenv("MODE", mode, 1);
1613
if(ret == -1){
1614
perror_plus("setenv");
1615
_exit(EX_OSERR);
1616
}
1617
char *delaystring;
1618
ret = asprintf(&delaystring, "%f", (double)delay);
1619
if(ret == -1){
1620
perror_plus("asprintf");
1621
_exit(EX_OSERR);
1622
}
1623
ret = setenv("DELAY", delaystring, 1);
1624
if(ret == -1){
1625
free(delaystring);
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
free(delaystring);
1630
if(connect_to != NULL){
1631
ret = setenv("CONNECT", connect_to, 1);
1632
if(ret == -1){
1633
perror_plus("setenv");
1634
_exit(EX_OSERR);
1635
}
1636
}
1637
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1638
if(hook_fd == -1){
1639
perror_plus("openat");
1640
_exit(EXIT_FAILURE);
1641
}
1642
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1643
perror_plus("close");
1644
_exit(EXIT_FAILURE);
1645
}
1646
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1647
environ) == -1){
1648
perror_plus("fexecve");
1649
_exit(EXIT_FAILURE);
1650
}
1651
} else {
1652
int status;
1653
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1654
perror_plus("waitpid");
1655
continue;
1656
}
1657
if(WIFEXITED(status)){
1658
if(WEXITSTATUS(status) != 0){
1659
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1660
" with status %d\n", direntry->d_name,
1661
WEXITSTATUS(status));
1662
continue;
1663
}
1664
} else if(WIFSIGNALED(status)){
1665
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1666
" signal %d\n", direntry->d_name,
1667
WTERMSIG(status));
1668
continue;
1669
} else {
1670
fprintf_plus(stderr, "Warning: network hook \"%s\""
1671
" crashed\n", direntry->d_name);
1672
continue;
1673
}
1674
}
1675
if(debug){
1676
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1677
direntry->d_name);
1678
}
1679
}
1680
free(direntries);
1681
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1682
perror_plus("close");
1683
} else {
1684
hookdir_fd = -1;
1685
}
1686
close(devnull);
1687
}
1688
1689
__attribute__((nonnull, warn_unused_result))
1690
error_t bring_up_interface(const char *const interface,
1691
const float delay){
1692
error_t old_errno = errno;
1693
int ret;
1694
struct ifreq network;
1695
unsigned int if_index = if_nametoindex(interface);
1696
if(if_index == 0){
1697
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1698
errno = old_errno;
1699
return ENXIO;
1700
}
1701
1702
if(quit_now){
1703
errno = old_errno;
1704
return EINTR;
1705
}
1706
1707
if(not interface_is_up(interface)){
1708
error_t ret_errno = 0, ioctl_errno = 0;
1709
if(not get_flags(interface, &network)){
1710
ret_errno = errno;
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", interface);
1713
errno = old_errno;
1714
return ret_errno;
1715
}
1716
network.ifr_flags |= IFF_UP; /* set flag */
1717
1718
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1719
if(sd == -1){
1720
ret_errno = errno;
1721
perror_plus("socket");
1722
errno = old_errno;
1723
return ret_errno;
1724
}
1725
1726
if(quit_now){
1727
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1728
if(ret == -1){
1729
perror_plus("close");
1730
}
1731
errno = old_errno;
1732
return EINTR;
1733
}
1734
1735
if(debug){
1736
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1737
interface);
1738
}
1739
1740
/* Raise privileges */
1741
ret_errno = raise_privileges();
1742
if(ret_errno != 0){
1743
errno = ret_errno;
1744
perror_plus("Failed to raise privileges");
1745
}
1746
1747
#ifdef __linux__
1748
int ret_linux;
1749
bool restore_loglevel = false;
1750
if(ret_errno == 0){
1751
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1752
messages about the network interface to mess up the prompt */
1753
ret_linux = klogctl(8, NULL, 5);
1754
if(ret_linux == -1){
1755
perror_plus("klogctl");
1756
} else {
1757
restore_loglevel = true;
1758
}
1759
}
1760
#endif /* __linux__ */
1761
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1762
ioctl_errno = errno;
1763
#ifdef __linux__
1764
if(restore_loglevel){
1765
ret_linux = klogctl(7, NULL, 0);
1766
if(ret_linux == -1){
1767
perror_plus("klogctl");
1768
}
1769
}
1770
#endif /* __linux__ */
1771
1772
/* If raise_privileges() succeeded above */
1773
if(ret_errno == 0){
1774
/* Lower privileges */
1775
ret_errno = lower_privileges();
1776
if(ret_errno != 0){
1777
errno = ret_errno;
1778
perror_plus("Failed to lower privileges");
1779
}
1780
}
1781
1782
/* Close the socket */
1783
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1784
if(ret == -1){
1785
perror_plus("close");
1786
}
1787
1788
if(ret_setflags == -1){
1789
errno = ioctl_errno;
1790
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1791
errno = old_errno;
1792
return ioctl_errno;
1793
}
1794
} else if(debug){
1795
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1796
interface);
1797
}
1798
1799
/* Sleep checking until interface is running.
1800
Check every 0.25s, up to total time of delay */
1801
for(int i=0; i < delay * 4; i++){
1802
if(interface_is_running(interface)){
1803
break;
1804
}
1805
struct timespec sleeptime = { .tv_nsec = 250000000 };
1806
ret = nanosleep(&sleeptime, NULL);
1807
if(ret == -1 and errno != EINTR){
1808
perror_plus("nanosleep");
1809
}
1810
}
1811
1812
errno = old_errno;
1813
return 0;
1814
}
1815
1816
__attribute__((nonnull, warn_unused_result))
1817
error_t take_down_interface(const char *const interface){
1818
error_t old_errno = errno;
1819
struct ifreq network;
1820
unsigned int if_index = if_nametoindex(interface);
1821
if(if_index == 0){
1822
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1823
errno = old_errno;
1824
return ENXIO;
1825
}
1826
if(interface_is_up(interface)){
1827
error_t ret_errno = 0, ioctl_errno = 0;
1828
if(not get_flags(interface, &network) and debug){
1829
ret_errno = errno;
1830
fprintf_plus(stderr, "Failed to get flags for interface "
1831
"\"%s\"\n", interface);
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1836
1837
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1838
if(sd == -1){
1839
ret_errno = errno;
1840
perror_plus("socket");
1841
errno = old_errno;
1842
return ret_errno;
1843
}
1844
1845
if(debug){
1846
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1847
interface);
1848
}
1849
1850
/* Raise privileges */
1851
ret_errno = raise_privileges();
1852
if(ret_errno != 0){
1853
errno = ret_errno;
1854
perror_plus("Failed to raise privileges");
1855
}
1856
1857
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1858
ioctl_errno = errno;
1859
1860
/* If raise_privileges() succeeded above */
1861
if(ret_errno == 0){
1862
/* Lower privileges */
1863
ret_errno = lower_privileges();
1864
if(ret_errno != 0){
1865
errno = ret_errno;
1866
perror_plus("Failed to lower privileges");
1867
}
1868
}
1869
1870
/* Close the socket */
1871
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1872
if(ret == -1){
1873
perror_plus("close");
1874
}
1875
1876
if(ret_setflags == -1){
1877
errno = ioctl_errno;
1878
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1879
errno = old_errno;
1880
return ioctl_errno;
1881
}
1882
} else if(debug){
1883
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1884
interface);
1885
}
1886
1887
errno = old_errno;
1888
return 0;
1889
}
1890
1891
1343
int main(int argc, char *argv[]){
1892
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1893
.priority = "SECURE256:!CTYPE-X.509:"
1894
"+CTYPE-OPENPGP", .current_server = NULL,
1895
.interfaces = NULL, .interfaces_size = 0 };
1896
1344
AvahiSServiceBrowser *sb = NULL;
1897
error_t ret_errno;
1345
int error;
1898
1346
int ret;
1899
1347
intmax_t tmpmax;
1900
1348
char *tmp;
1901
1349
int exitcode = EXIT_SUCCESS;
1902
char *interfaces_to_take_down = NULL;
1903
size_t interfaces_to_take_down_size = 0;
1904
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1905
char old_tempdir[] = "/tmp/mandosXXXXXX";
1906
char *tempdir = NULL;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
1907
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1908
1359
const char *seckey = PATHDIR "/" SECKEY;
1909
1360
const char *pubkey = PATHDIR "/" PUBKEY;
1910
char *interfaces_hooks = NULL;
1911
1361
1912
1362
bool gnutls_initialized = false;
1913
1363
bool gpgme_initialized = false;
1975
1425
.group = 2 },
1976
1426
{ .name = "retry", .key = 132,
1977
1427
.arg = "SECONDS",
1978
.doc = "Retry interval used when denied by the Mandos server",
1979
.group = 2 },
1980
{ .name = "network-hook-dir", .key = 133,
1981
.arg = "DIR",
1982
.doc = "Directory where network hooks are located",
1428
.doc = "Retry interval used when denied by the mandos server",
1983
1429
.group = 2 },
1984
1430
/*
1985
1431
* These reproduce what we would get without ARGP_NO_HELP
2004
1450
connect_to = arg;
2005
1451
break;
2006
1452
case 'i': /* --interface */
2007
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2008
arg, (int)',');
2009
if(ret_errno != 0){
2010
argp_error(state, "%s", strerror(ret_errno));
2011
}
1453
interface = arg;
2012
1454
break;
2013
1455
case 's': /* --seckey */
2014
1456
seckey = arg;
2043
1485
argp_error(state, "Bad retry interval");
2044
1486
}
2045
1487
break;
2046
case 133: /* --network-hook-dir */
2047
hookdir = arg;
2048
break;
2049
1488
/*
2050
1489
* These reproduce what we would get without ARGP_NO_HELP
2051
1490
*/
2057
1496
argp_state_help(state, state->out_stream,
2058
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2059
1498
case 'V': /* --version */
2060
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2061
1500
exit(argp_err_exit_status);
2062
1501
break;
2063
1502
default:
2090
1529
{
2091
1530
/* Work around Debian bug #633582:
2092
1531
<http://bugs.debian.org/633582> */
2093
2094
/* Re-raise privileges */
2095
ret_errno = raise_privileges();
2096
if(ret_errno != 0){
2097
errno = ret_errno;
2098
perror_plus("Failed to raise privileges");
2099
} else {
2100
struct stat st;
2101
2102
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2103
int seckey_fd = open(seckey, O_RDONLY);
2104
if(seckey_fd == -1){
2105
perror_plus("open");
2106
} else {
2107
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2108
if(ret == -1){
2109
perror_plus("fstat");
2110
} else {
2111
if(S_ISREG(st.st_mode)
2112
and st.st_uid == 0 and st.st_gid == 0){
2113
ret = fchown(seckey_fd, uid, gid);
2114
if(ret == -1){
2115
perror_plus("fchown");
2116
}
2117
}
2118
}
2119
TEMP_FAILURE_RETRY(close(seckey_fd));
2120
}
2121
}
2122
2123
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2124
int pubkey_fd = open(pubkey, O_RDONLY);
2125
if(pubkey_fd == -1){
2126
perror_plus("open");
2127
} else {
2128
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2129
if(ret == -1){
2130
perror_plus("fstat");
2131
} else {
2132
if(S_ISREG(st.st_mode)
2133
and st.st_uid == 0 and st.st_gid == 0){
2134
ret = fchown(pubkey_fd, uid, gid);
2135
if(ret == -1){
2136
perror_plus("fchown");
2137
}
2138
}
2139
}
2140
TEMP_FAILURE_RETRY(close(pubkey_fd));
2141
}
2142
}
2143
2144
/* Lower privileges */
2145
ret_errno = lower_privileges();
2146
if(ret_errno != 0){
2147
errno = ret_errno;
2148
perror_plus("Failed to lower privileges");
2149
}
2150
}
2151
}
2152
2153
/* Remove invalid interface names (except "none") */
2154
{
2155
char *interface = NULL;
2156
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2157
interface))){
2158
if(strcmp(interface, "none") != 0
2159
and if_nametoindex(interface) == 0){
2160
if(interface[0] != '\0'){
2161
fprintf_plus(stderr, "Not using nonexisting interface"
2162
" \"%s\"\n", interface);
2163
}
2164
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2165
interface = NULL;
2166
}
2167
}
2168
}
2169
2170
/* Run network hooks */
2171
{
2172
if(mc.interfaces != NULL){
2173
interfaces_hooks = malloc(mc.interfaces_size);
2174
if(interfaces_hooks == NULL){
2175
perror_plus("malloc");
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
setenv("DEVICE", interface, 1);
1612
setenv("VERBOSE", debug ? "1" : "0", 1);
1613
setenv("MODE", "start", 1);
1614
/* setenv( XXX more here */
1615
ret = execl(fullname, direntry->d_name, "start", NULL);
1616
perror_plus("execl");
1617
}
1618
free(fullname);
1619
if(quit_now){
2176
1620
goto end;
2177
1621
}
2178
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2179
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2180
1622
}
2181
run_network_hooks("start", interfaces_hooks != NULL ?
2182
interfaces_hooks : "", delay);
1623
close(devnull);
2183
1624
}
2184
1625
2185
1626
if(not debug){
2186
1627
avahi_set_log_function(empty_log);
2187
1628
}
2188
1629
1630
if(interface[0] == '\0'){
1631
struct dirent **direntries;
1632
/* First look for interfaces that are up */
1633
ret = scandir(sys_class_net, &direntries, up_interface,
1634
alphasort);
1635
if(ret == 0){
1636
/* No up interfaces, look for any good interfaces */
1637
free(direntries);
1638
ret = scandir(sys_class_net, &direntries, good_interface,
1639
alphasort);
1640
}
1641
if(ret >= 1){
1642
/* Pick the first interface returned */
1643
interface = strdup(direntries[0]->d_name);
1644
if(debug){
1645
fprintf(stderr, "Using interface \"%s\"\n", interface);
1646
}
1647
if(interface == NULL){
1648
perror_plus("malloc");
1649
free(direntries);
1650
exitcode = EXIT_FAILURE;
1651
goto end;
1652
}
1653
free(direntries);
1654
} else {
1655
free(direntries);
1656
fprintf(stderr, "Could not find a network interface\n");
1657
exitcode = EXIT_FAILURE;
1658
goto end;
1659
}
1660
}
1661
2189
1662
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2190
1663
from the signal handler */
2191
1664
/* Initialize the pseudo-RNG for Avahi */
2192
1665
srand((unsigned int) time(NULL));
2193
simple_poll = avahi_simple_poll_new();
2194
if(simple_poll == NULL){
2195
fprintf_plus(stderr,
2196
"Avahi: Failed to create simple poll object.\n");
1666
mc.simple_poll = avahi_simple_poll_new();
1667
if(mc.simple_poll == NULL){
1668
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2197
1669
exitcode = EX_UNAVAILABLE;
2198
1670
goto end;
2199
1671
}
2261
1733
}
2262
1734
}
2263
1735
2264
/* If no interfaces were specified, make a list */
2265
if(mc.interfaces == NULL){
2266
struct dirent **direntries = NULL;
2267
/* Look for any good interfaces */
2268
ret = scandir(sys_class_net, &direntries, good_interface,
2269
alphasort);
2270
if(ret >= 1){
2271
/* Add all found interfaces to interfaces list */
2272
for(int i = 0; i < ret; ++i){
2273
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2274
direntries[i]->d_name);
2275
if(ret_errno != 0){
2276
errno = ret_errno;
2277
perror_plus("argz_add");
2278
continue;
2279
}
2280
if(debug){
2281
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2282
direntries[i]->d_name);
2283
}
2284
}
2285
free(direntries);
1736
/* If the interface is down, bring it up */
1737
if(strcmp(interface, "none") != 0){
1738
if_index = (AvahiIfIndex) if_nametoindex(interface);
1739
if(if_index == 0){
1740
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1741
exitcode = EX_UNAVAILABLE;
1742
goto end;
1743
}
1744
1745
if(quit_now){
1746
goto end;
1747
}
1748
1749
/* Re-raise priviliges */
1750
errno = 0;
1751
ret = seteuid(0);
1752
if(ret == -1){
1753
perror_plus("seteuid");
1754
}
1755
1756
#ifdef __linux__
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret = klogctl(8, NULL, 5);
1760
bool restore_loglevel = true;
1761
if(ret == -1){
1762
restore_loglevel = false;
1763
perror_plus("klogctl");
1764
}
1765
#endif /* __linux__ */
1766
1767
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1768
if(sd < 0){
1769
perror_plus("socket");
1770
exitcode = EX_OSERR;
1771
#ifdef __linux__
1772
if(restore_loglevel){
1773
ret = klogctl(7, NULL, 0);
1774
if(ret == -1){
1775
perror_plus("klogctl");
1776
}
1777
}
1778
#endif /* __linux__ */
1779
/* Lower privileges */
1780
errno = 0;
1781
ret = seteuid(uid);
1782
if(ret == -1){
1783
perror_plus("seteuid");
1784
}
1785
goto end;
1786
}
1787
strcpy(network.ifr_name, interface);
1788
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1789
if(ret == -1){
1790
perror_plus("ioctl SIOCGIFFLAGS");
1791
#ifdef __linux__
1792
if(restore_loglevel){
1793
ret = klogctl(7, NULL, 0);
1794
if(ret == -1){
1795
perror_plus("klogctl");
1796
}
1797
}
1798
#endif /* __linux__ */
1799
exitcode = EX_OSERR;
1800
/* Lower privileges */
1801
errno = 0;
1802
ret = seteuid(uid);
1803
if(ret == -1){
1804
perror_plus("seteuid");
1805
}
1806
goto end;
1807
}
1808
if((network.ifr_flags & IFF_UP) == 0){
1809
network.ifr_flags |= IFF_UP;
1810
take_down_interface = true;
1811
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1812
if(ret == -1){
1813
take_down_interface = false;
1814
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1815
exitcode = EX_OSERR;
1816
#ifdef __linux__
1817
if(restore_loglevel){
1818
ret = klogctl(7, NULL, 0);
1819
if(ret == -1){
1820
perror_plus("klogctl");
1821
}
1822
}
1823
#endif /* __linux__ */
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
}
1833
/* Sleep checking until interface is running.
1834
Check every 0.25s, up to total time of delay */
1835
for(int i=0; i < delay * 4; i++){
1836
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1837
if(ret == -1){
1838
perror_plus("ioctl SIOCGIFFLAGS");
1839
} else if(network.ifr_flags & IFF_RUNNING){
1840
break;
1841
}
1842
struct timespec sleeptime = { .tv_nsec = 250000000 };
1843
ret = nanosleep(&sleeptime, NULL);
1844
if(ret == -1 and errno != EINTR){
1845
perror_plus("nanosleep");
1846
}
1847
}
1848
if(not take_down_interface){
1849
/* We won't need the socket anymore */
1850
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1851
if(ret == -1){
1852
perror_plus("close");
1853
}
1854
}
1855
#ifdef __linux__
1856
if(restore_loglevel){
1857
/* Restores kernel loglevel to default */
1858
ret = klogctl(7, NULL, 0);
1859
if(ret == -1){
1860
perror_plus("klogctl");
1861
}
1862
}
1863
#endif /* __linux__ */
1864
/* Lower privileges */
1865
errno = 0;
1866
if(take_down_interface){
1867
/* Lower privileges */
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
2286
1872
} else {
2287
if(ret == 0){
2288
free(direntries);
2289
}
2290
fprintf_plus(stderr, "Could not find a network interface\n");
2291
exitcode = EXIT_FAILURE;
2292
goto end;
2293
}
2294
}
2295
2296
/* Bring up interfaces which are down, and remove any "none"s */
2297
{
2298
char *interface = NULL;
2299
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2300
interface))){
2301
/* If interface name is "none", stop bringing up interfaces.
2302
Also remove all instances of "none" from the list */
2303
if(strcmp(interface, "none") == 0){
2304
argz_delete(&mc.interfaces, &mc.interfaces_size,
2305
interface);
2306
interface = NULL;
2307
while((interface = argz_next(mc.interfaces,
2308
mc.interfaces_size, interface))){
2309
if(strcmp(interface, "none") == 0){
2310
argz_delete(&mc.interfaces, &mc.interfaces_size,
2311
interface);
2312
interface = NULL;
2313
}
2314
}
2315
break;
2316
}
2317
bool interface_was_up = interface_is_up(interface);
2318
errno = bring_up_interface(interface, delay);
2319
if(not interface_was_up){
2320
if(errno != 0){
2321
perror_plus("Failed to bring up interface");
2322
} else {
2323
errno = argz_add(&interfaces_to_take_down,
2324
&interfaces_to_take_down_size,
2325
interface);
2326
if(errno != 0){
2327
perror_plus("argz_add");
2328
}
2329
}
2330
}
2331
}
2332
if(debug and (interfaces_to_take_down == NULL)){
2333
fprintf_plus(stderr, "No interfaces were brought up\n");
2334
}
2335
}
2336
2337
/* If we only got one interface, explicitly use only that one */
2338
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2339
if(debug){
2340
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2341
mc.interfaces);
2342
}
2343
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1873
/* Lower privileges permanently */
1874
ret = setuid(uid);
1875
if(ret == -1){
1876
perror_plus("setuid");
1877
}
1878
}
2344
1879
}
2345
1880
2346
1881
if(quit_now){
2347
1882
goto end;
2348
1883
}
2349
1884
2350
ret = init_gnutls_global(pubkey, seckey, &mc);
1885
ret = init_gnutls_global(pubkey, seckey);
2351
1886
if(ret == -1){
2352
fprintf_plus(stderr, "init_gnutls_global failed\n");
1887
fprintf(stderr, "init_gnutls_global failed\n");
2353
1888
exitcode = EX_UNAVAILABLE;
2354
1889
goto end;
2355
1890
} else {
2360
1895
goto end;
2361
1896
}
2362
1897
2363
/* Try /run/tmp before /tmp */
2364
tempdir = mkdtemp(run_tempdir);
2365
if(tempdir == NULL and errno == ENOENT){
2366
if(debug){
2367
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2368
run_tempdir, old_tempdir);
2369
}
2370
tempdir = mkdtemp(old_tempdir);
2371
}
2372
if(tempdir == NULL){
1898
if(mkdtemp(tempdir) == NULL){
2373
1899
perror_plus("mkdtemp");
2374
1900
goto end;
2375
1901
}
1902
tempdir_created = true;
2376
1903
2377
1904
if(quit_now){
2378
1905
goto end;
2379
1906
}
2380
1907
2381
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2382
fprintf_plus(stderr, "init_gpgme failed\n");
1908
if(not init_gpgme(pubkey, seckey, tempdir)){
1909
fprintf(stderr, "init_gpgme failed\n");
2383
1910
exitcode = EX_UNAVAILABLE;
2384
1911
goto end;
2385
1912
} else {
2394
1921
/* Connect directly, do not use Zeroconf */
2395
1922
/* (Mainly meant for debugging) */
2396
1923
char *address = strrchr(connect_to, ':');
2397
2398
1924
if(address == NULL){
2399
fprintf_plus(stderr, "No colon in address\n");
1925
fprintf(stderr, "No colon in address\n");
2400
1926
exitcode = EX_USAGE;
2401
1927
goto end;
2402
1928
}
2405
1931
goto end;
2406
1932
}
2407
1933
2408
in_port_t port;
1934
uint16_t port;
2409
1935
errno = 0;
2410
1936
tmpmax = strtoimax(address+1, &tmp, 10);
2411
1937
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2412
or tmpmax != (in_port_t)tmpmax){
2413
fprintf_plus(stderr, "Bad port number\n");
1938
or tmpmax != (uint16_t)tmpmax){
1939
fprintf(stderr, "Bad port number\n");
2414
1940
exitcode = EX_USAGE;
2415
1941
goto end;
2416
1942
}
2417
1943
2418
1944
if(quit_now){
2419
1945
goto end;
2420
1946
}
2421
1947
2422
port = (in_port_t)tmpmax;
1948
port = (uint16_t)tmpmax;
2423
1949
*address = '\0';
2424
1950
/* Colon in address indicates IPv6 */
2425
1951
int af;
2441
1967
}
2442
1968
2443
1969
while(not quit_now){
2444
ret = start_mandos_communication(address, port, if_index, af,
2445
&mc);
1970
ret = start_mandos_communication(address, port, if_index, af);
2446
1971
if(quit_now or ret == 0){
2447
1972
break;
2448
1973
}
2449
1974
if(debug){
2450
fprintf_plus(stderr, "Retrying in %d seconds\n",
2451
(int)retry_interval);
1975
fprintf(stderr, "Retrying in %d seconds\n",
1976
(int)retry_interval);
2452
1977
}
2453
sleep((unsigned int)retry_interval);
1978
sleep((int)retry_interval);
2454
1979
}
2455
1980
2456
if(not quit_now){
1981
if (not quit_now){
2457
1982
exitcode = EXIT_SUCCESS;
2458
1983
}
2459
1984
2474
1999
config.publish_domain = 0;
2475
2000
2476
2001
/* Allocate a new server */
2477
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2478
&config, NULL, NULL, &ret_errno);
2002
mc.server = avahi_server_new(avahi_simple_poll_get
2003
(mc.simple_poll), &config, NULL,
2004
NULL, &error);
2479
2005
2480
2006
/* Free the Avahi configuration data */
2481
2007
avahi_server_config_free(&config);
2483
2009
2484
2010
/* Check if creating the Avahi server object succeeded */
2485
2011
if(mc.server == NULL){
2486
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2487
avahi_strerror(ret_errno));
2012
fprintf(stderr, "Failed to create Avahi server: %s\n",
2013
avahi_strerror(error));
2488
2014
exitcode = EX_UNAVAILABLE;
2489
2015
goto end;
2490
2016
}
2496
2022
/* Create the Avahi service browser */
2497
2023
sb = avahi_s_service_browser_new(mc.server, if_index,
2498
2024
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2499
NULL, 0, browse_callback,
2500
(void *)&mc);
2025
NULL, 0, browse_callback, NULL);
2501
2026
if(sb == NULL){
2502
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2503
avahi_strerror(avahi_server_errno(mc.server)));
2027
fprintf(stderr, "Failed to create service browser: %s\n",
2028
avahi_strerror(avahi_server_errno(mc.server)));
2504
2029
exitcode = EX_UNAVAILABLE;
2505
2030
goto end;
2506
2031
}
2512
2037
/* Run the main loop */
2513
2038
2514
2039
if(debug){
2515
fprintf_plus(stderr, "Starting Avahi loop search\n");
2040
fprintf(stderr, "Starting Avahi loop search\n");
2516
2041
}
2517
2518
ret = avahi_loop_with_timeout(simple_poll,
2519
(int)(retry_interval * 1000), &mc);
2042
2043
ret = avahi_loop_with_timeout(mc.simple_poll,
2044
(int)(retry_interval * 1000));
2520
2045
if(debug){
2521
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2522
(ret == 0) ? "successfully" : "with error");
2046
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2047
(ret == 0) ? "successfully" : "with error");
2523
2048
}
2524
2049
2525
2050
end:
2526
2051
2527
2052
if(debug){
2528
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2053
fprintf(stderr, "%s exiting\n", argv[0]);
2529
2054
}
2530
2055
2531
2056
/* Cleanup things */
2532
free(mc.interfaces);
2533
2534
2057
if(sb != NULL)
2535
2058
avahi_s_service_browser_free(sb);
2536
2059
2537
2060
if(mc.server != NULL)
2538
2061
avahi_server_free(mc.server);
2539
2062
2540
if(simple_poll != NULL)
2541
avahi_simple_poll_free(simple_poll);
2063
if(mc.simple_poll != NULL)
2064
avahi_simple_poll_free(mc.simple_poll);
2542
2065
2543
2066
if(gnutls_initialized){
2544
2067
gnutls_certificate_free_credentials(mc.cred);
2549
2072
if(gpgme_initialized){
2550
2073
gpgme_release(mc.ctx);
2551
2074
}
2552
2075
2553
2076
/* Cleans up the circular linked list of Mandos servers the client
2554
2077
has seen */
2555
2078
if(mc.current_server != NULL){
2556
2079
mc.current_server->prev->next = NULL;
2557
2080
while(mc.current_server != NULL){
2558
2081
server *next = mc.current_server->next;
2559
#ifdef __GNUC__
2560
#pragma GCC diagnostic push
2561
#pragma GCC diagnostic ignored "-Wcast-qual"
2562
#endif
2563
free((char *)(mc.current_server->ip));
2564
#ifdef __GNUC__
2565
#pragma GCC diagnostic pop
2566
#endif
2567
2082
free(mc.current_server);
2568
2083
mc.current_server = next;
2569
2084
}
2570
2085
}
2571
2086
2572
/* Re-raise privileges */
2573
{
2574
ret_errno = raise_privileges();
2575
if(ret_errno != 0){
2576
errno = ret_errno;
2577
perror_plus("Failed to raise privileges");
2578
} else {
2579
2580
/* Run network hooks */
2581
run_network_hooks("stop", interfaces_hooks != NULL ?
2582
interfaces_hooks : "", delay);
2583
2584
/* Take down the network interfaces which were brought up */
2585
{
2586
char *interface = NULL;
2587
while((interface=argz_next(interfaces_to_take_down,
2588
interfaces_to_take_down_size,
2589
interface))){
2590
ret_errno = take_down_interface(interface);
2591
if(ret_errno != 0){
2592
errno = ret_errno;
2593
perror_plus("Failed to take down interface");
2594
}
2595
}
2596
if(debug and (interfaces_to_take_down == NULL)){
2597
fprintf_plus(stderr, "No interfaces needed to be taken"
2598
" down\n");
2599
}
2600
}
2087
/* XXX run network hooks "stop" here */
2088
2089
/* Take down the network interface */
2090
if(take_down_interface){
2091
/* Re-raise priviliges */
2092
errno = 0;
2093
ret = seteuid(0);
2094
if(ret == -1){
2095
perror_plus("seteuid");
2601
2096
}
2602
2603
ret_errno = lower_privileges_permanently();
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to lower privileges permanently");
2097
if(geteuid() == 0){
2098
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2099
if(ret == -1){
2100
perror_plus("ioctl SIOCGIFFLAGS");
2101
} else if(network.ifr_flags & IFF_UP) {
2102
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2104
if(ret == -1){
2105
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2106
}
2107
}
2108
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2109
if(ret == -1){
2110
perror_plus("close");
2111
}
2112
/* Lower privileges permanently */
2113
errno = 0;
2114
ret = setuid(uid);
2115
if(ret == -1){
2116
perror_plus("setuid");
2117
}
2607
2118
}
2608
2119
}
2609
2120
2610
free(interfaces_to_take_down);
2611
free(interfaces_hooks);
2612
2613
2121
/* Removes the GPGME temp directory and all files inside */
2614
if(tempdir != NULL){
2122
if(tempdir_created){
2615
2123
struct dirent **direntries = NULL;
2616
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2617
O_NOFOLLOW));
2618
if(tempdir_fd == -1){
2619
perror_plus("open");
2620
} else {
2621
#ifdef __GLIBC__
2622
#if __GLIBC_PREREQ(2, 15)
2623
int numentries = scandirat(tempdir_fd, ".", &direntries,
2624
notdotentries, alphasort);
2625
#else /* not __GLIBC_PREREQ(2, 15) */
2626
int numentries = scandir(tempdir, &direntries, notdotentries,
2627
alphasort);
2628
#endif /* not __GLIBC_PREREQ(2, 15) */
2629
#else /* not __GLIBC__ */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2631
alphasort);
2632
#endif /* not __GLIBC__ */
2633
if(numentries >= 0){
2634
for(int i = 0; i < numentries; i++){
2635
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2636
if(ret == -1){
2637
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2638
" \"%s\", 0): %s\n", tempdir,
2639
direntries[i]->d_name, strerror(errno));
2640
}
2641
}
2642
2643
/* need to clean even if 0 because man page doesn't specify */
2644
free(direntries);
2645
if(numentries == -1){
2646
perror_plus("scandir");
2647
}
2648
ret = rmdir(tempdir);
2649
if(ret == -1 and errno != ENOENT){
2650
perror_plus("rmdir");
2651
}
2124
struct dirent *direntry = NULL;
2125
int numentries = scandir(tempdir, &direntries, notdotentries,
2126
alphasort);
2127
if (numentries > 0){
2128
for(int i = 0; i < numentries; i++){
2129
direntry = direntries[i];
2130
char *fullname = NULL;
2131
ret = asprintf(&fullname, "%s/%s", tempdir,
2132
direntry->d_name);
2133
if(ret < 0){
2134
perror_plus("asprintf");
2135
continue;
2136
}
2137
ret = remove(fullname);
2138
if(ret == -1){
2139
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2140
strerror(errno));
2141
}
2142
free(fullname);
2652
2143
}
2653
TEMP_FAILURE_RETRY(close(tempdir_fd));
2144
}
2145
2146
/* need to clean even if 0 because man page doesn't specify */
2147
free(direntries);
2148
if (numentries == -1){
2149
perror_plus("scandir");
2150
}
2151
ret = rmdir(tempdir);
2152
if(ret == -1 and errno != ENOENT){
2153
perror_plus("rmdir");
2654
2154
}
2655
2155
}
2656
2156
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0