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237.7.261
(compared to revision 237.7.38)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-07-14 21:41:08 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 319.
- Revision ID: teddy@recompile.se-20140714214108-awg7u6gaiy7d40dz
mandos-monitor: New "verbose" mode to see less important log messages.
* mandos-monitor (MandosClientWidget.__init__): Log client creation.
(MandosClientWidget.checker_completed): Log a successful checker.
(MandosClientWidget.checker_started): Log starting of a checker.
(UserInterface.__init__): New optional "log_level" argument.
(UserInterface.log_message, UserInterface.log_message_raw): Take
optional
"level"
arg.
(UserInterface.toggle_log_display): Log visibility change.
(UserInterface.change_log_display): Log wrap mode change.
(UserInterface.process_input): Show new "v" key in help message and
process "v" key if pressed.
* mandos-monitor.xml (KEYS): Document new "v" key.
* mandos-monitor (MandosClientWidget.__init__): Log client creation.
(MandosClientWidget.checker_completed): Log a successful checker.
(MandosClientWidget.checker_started): Log starting of a checker.
(UserInterface.__init__): New optional "log_level" argument.
(UserInterface.log_message, UserInterface.log_message_raw): Take
optional
"level"
arg.
(UserInterface.toggle_log_display): Log visibility change.
(UserInterface.change_log_display): Log wrap mode change.
(UserInterface.process_input): Show new "v" key in help message and
process "v" key if pressed.
* mandos-monitor.xml (KEYS): Document new "v" key.
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
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() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
85
86
raise() */
86
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
88
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() */
88
98
89
99
#ifdef __linux__
90
100
#include <sys/klog.h> /* klogctl() */
108
118
init_gnutls_session(),
109
119
GNUTLS_* */
110
120
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
123
114
124
/* GPGME */
115
125
#include <gpgme.h> /* All GPGME types, constants and
123
133
#define PATHDIR "/conf/conf.d/mandos"
124
134
#define SECKEY "seckey.txt"
125
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
137
127
138
bool debug = false;
128
139
static const char mandos_protocol_version[] = "1";
129
140
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
142
static const char sys_class_net[] = "/sys/class/net";
132
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
133
148
134
149
/* Doubly linked list that need to be circularly linked when used */
135
150
typedef struct server{
136
151
const char *ip;
137
uint16_t port;
152
in_port_t port;
138
153
AvahiIfIndex if_index;
139
154
int af;
140
155
struct timespec last_seen;
144
159
145
160
/* Used for passing in values through the Avahi callback functions */
146
161
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
162
AvahiServer *server;
149
163
gnutls_certificate_credentials_t cred;
150
164
unsigned int dh_bits;
152
166
const char *priority;
153
167
gpgme_ctx_t ctx;
154
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
155
171
} mandos_context;
156
172
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
175
163
176
sig_atomic_t quit_now = 0;
164
177
int signal_received = 0;
165
178
166
179
/* Function to use when printing errors */
167
180
void perror_plus(const char *print_text){
181
int e = errno;
168
182
fprintf(stderr, "Mandos plugin %s: ",
169
183
program_invocation_short_name);
184
errno = e;
170
185
perror(print_text);
171
186
}
172
187
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
173
198
/*
174
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
200
* bytes. "buffer_capacity" is how much is currently allocated,
176
201
* "buffer_length" is how much is already used.
177
202
*/
203
__attribute__((nonnull, warn_unused_result))
178
204
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
205
size_t buffer_capacity){
180
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
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;
183
213
return 0;
184
214
}
215
*buffer = new_buf;
185
216
buffer_capacity += BUFFER_SIZE;
186
217
}
187
218
return buffer_capacity;
188
219
}
189
220
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
221
/* 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){
193
225
int ret;
194
226
server *new_server = malloc(sizeof(server));
195
227
if(new_server == NULL){
196
228
perror_plus("malloc");
197
return -1;
229
return false;
198
230
}
199
231
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
203
235
if(new_server->ip == NULL){
204
236
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
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
free(new_server->ip);
244
free(new_server);
245
return false;
246
}
247
/* Special case of first server */
248
if(*current_server == NULL){
209
249
new_server->next = new_server;
210
250
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
251
*current_server = new_server;
213
252
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
216
256
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
257
(*current_server)->prev = new_server;
258
}
259
return true;
225
260
}
226
261
227
262
/*
228
263
* Initialize GPGME.
229
264
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
232
270
gpgme_error_t rc;
233
271
gpgme_engine_info_t engine_info;
234
272
235
236
273
/*
237
274
* Helper function to insert pub and seckey to the engine keyring.
238
275
*/
239
bool import_key(const char *filename){
276
bool import_key(const char * const filename){
240
277
int ret;
241
278
int fd;
242
279
gpgme_data_t pgp_data;
249
286
250
287
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
288
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
254
291
return false;
255
292
}
256
293
257
rc = gpgme_op_import(mc.ctx, pgp_data);
294
rc = gpgme_op_import(mc->ctx, pgp_data);
258
295
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
261
298
return false;
262
299
}
263
300
270
307
}
271
308
272
309
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
310
fprintf_plus(stderr, "Initializing GPGME\n");
274
311
}
275
312
276
313
/* Init GPGME */
277
314
gpgme_check_version(NULL);
278
315
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
316
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
282
319
return false;
283
320
}
284
321
285
/* Set GPGME home directory for the OpenPGP engine only */
322
/* Set GPGME home directory for the OpenPGP engine only */
286
323
rc = gpgme_get_engine_info(&engine_info);
287
324
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
290
327
return false;
291
328
}
292
329
while(engine_info != NULL){
298
335
engine_info = engine_info->next;
299
336
}
300
337
if(engine_info == NULL){
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
tempdir);
302
340
return false;
303
341
}
304
342
305
343
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
344
rc = gpgme_new(&(mc->ctx));
307
345
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
310
349
return false;
311
350
}
312
351
321
360
* Decrypt OpenPGP data.
322
361
* Returns -1 on error
323
362
*/
363
__attribute__((nonnull, warn_unused_result))
324
364
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
365
size_t crypto_size,
326
char **plaintext){
366
char **plaintext,
367
mandos_context *mc){
327
368
gpgme_data_t dh_crypto, dh_plain;
328
369
gpgme_error_t rc;
329
370
ssize_t ret;
331
372
ssize_t plaintext_length = 0;
332
373
333
374
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
376
}
336
377
337
378
/* Create new GPGME data buffer from memory cryptotext */
338
379
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
380
0);
340
381
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
343
384
return -1;
344
385
}
345
386
346
387
/* Create new empty GPGME data buffer for the plaintext */
347
388
rc = gpgme_data_new(&dh_plain);
348
389
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
351
393
gpgme_data_release(dh_crypto);
352
394
return -1;
353
395
}
354
396
355
397
/* Decrypt data from the cryptotext data buffer to the plaintext
356
398
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
400
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
361
403
plaintext_length = -1;
362
404
if(debug){
363
405
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
406
result = gpgme_op_decrypt_result(mc->ctx);
365
407
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
409
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
372
414
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
416
}
375
417
gpgme_recipient_t recipient;
376
418
recipient = result->recipients;
377
419
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
384
427
recipient = recipient->next;
385
428
}
386
429
}
389
432
}
390
433
391
434
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
436
}
394
437
395
438
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
445
*plaintext = NULL;
403
446
while(true){
404
447
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
448
(size_t)plaintext_length,
449
plaintext_capacity);
407
450
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
451
perror_plus("incbuffer");
452
plaintext_length = -1;
453
goto decrypt_end;
411
454
}
412
455
413
456
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
469
}
427
470
428
471
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
472
fprintf_plus(stderr, "Decrypted password is: ");
430
473
for(ssize_t i = 0; i < plaintext_length; i++){
431
474
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
475
}
443
486
return plaintext_length;
444
487
}
445
488
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
449
492
if(ret == NULL)
450
493
ret = "(unknown)";
451
494
return ret;
452
495
}
453
496
454
497
/* GnuTLS log function callback */
498
__attribute__((nonnull))
455
499
static void debuggnutls(__attribute__((unused)) int level,
456
500
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
501
fprintf_plus(stderr, "GnuTLS: %s", string);
458
502
}
459
503
504
__attribute__((nonnull, warn_unused_result))
460
505
static int init_gnutls_global(const char *pubkeyfilename,
461
const char *seckeyfilename){
506
const char *seckeyfilename,
507
mandos_context *mc){
462
508
int ret;
463
509
464
510
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
512
}
467
513
468
514
ret = gnutls_global_init();
469
515
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
472
518
return -1;
473
519
}
474
520
481
527
}
482
528
483
529
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
531
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
488
534
gnutls_global_deinit();
489
535
return -1;
490
536
}
491
537
492
538
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
541
pubkeyfilename,
542
seckeyfilename);
496
543
}
497
544
498
545
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
546
(mc->cred, pubkeyfilename, seckeyfilename,
500
547
GNUTLS_OPENPGP_FMT_BASE64);
501
548
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
549
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
507
554
goto globalfail;
508
555
}
509
556
510
557
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
558
ret = gnutls_dh_params_init(&mc->dh_params);
512
559
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
515
563
goto globalfail;
516
564
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
566
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
521
569
goto globalfail;
522
570
}
523
571
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
573
526
574
return 0;
527
575
528
576
globalfail:
529
577
530
gnutls_certificate_free_credentials(mc.cred);
578
gnutls_certificate_free_credentials(mc->cred);
531
579
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
580
gnutls_dh_params_deinit(mc->dh_params);
533
581
return -1;
534
582
}
535
583
536
static int init_gnutls_session(gnutls_session_t *session){
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
537
587
int ret;
538
588
/* GnuTLS session creation */
539
589
do {
543
593
}
544
594
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
595
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
596
fprintf_plus(stderr,
597
"Error in GnuTLS session initialization: %s\n",
598
safer_gnutls_strerror(ret));
548
599
}
549
600
550
601
{
551
602
const char *err;
552
603
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
605
if(quit_now){
555
606
gnutls_deinit(*session);
556
607
return -1;
557
608
}
558
609
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
610
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
611
fprintf_plus(stderr, "Syntax error at: %s\n", err);
612
fprintf_plus(stderr, "GnuTLS error: %s\n",
613
safer_gnutls_strerror(ret));
563
614
gnutls_deinit(*session);
564
615
return -1;
565
616
}
567
618
568
619
do {
569
620
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
621
mc->cred);
571
622
if(quit_now){
572
623
gnutls_deinit(*session);
573
624
return -1;
574
625
}
575
626
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
627
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
628
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
629
safer_gnutls_strerror(ret));
579
630
gnutls_deinit(*session);
580
631
return -1;
581
632
}
583
634
/* ignore client certificate if any. */
584
635
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
636
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
638
588
639
return 0;
589
640
}
593
644
__attribute__((unused)) const char *txt){}
594
645
595
646
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
597
649
AvahiIfIndex if_index,
598
int af){
650
int af, mandos_context *mc){
599
651
int ret, tcp_sd = -1;
600
652
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
653
struct sockaddr_storage to;
605
654
char *buffer = NULL;
606
655
char *decrypted_buffer = NULL;
607
656
size_t buffer_length = 0;
626
675
pf = PF_INET;
627
676
break;
628
677
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
679
errno = EINVAL;
631
680
return -1;
632
681
}
633
682
634
ret = init_gnutls_session(&session);
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
635
716
if(ret != 0){
636
717
return -1;
637
718
}
638
719
639
720
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
642
723
}
643
724
644
725
tcp_sd = socket(pf, SOCK_STREAM, 0);
656
737
657
738
memset(&to, 0, sizeof(to));
658
739
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
661
742
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
664
745
}
665
746
if(ret < 0 ){
666
747
int e = errno;
670
751
}
671
752
if(ret == 0){
672
753
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
755
errno = e;
675
756
goto mandos_end;
676
757
}
677
758
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
685
762
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
688
765
errno = EINVAL;
689
766
goto mandos_end;
690
767
}
691
768
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
770
}
694
771
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
698
773
}
699
774
700
775
if(quit_now){
708
783
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
784
perror_plus("if_indextoname");
710
785
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
713
788
}
714
789
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
717
792
}
718
793
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
794
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
795
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
724
800
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
727
805
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
812
}
735
813
}
736
814
740
818
}
741
819
742
820
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
744
823
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
746
826
}
747
827
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
829
int e = errno;
750
830
perror_plus("connect");
751
831
errno = e;
763
843
while(true){
764
844
size_t out_size = strlen(out);
765
845
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
846
out_size - written));
767
847
if(ret == -1){
768
848
int e = errno;
769
849
perror_plus("write");
789
869
}
790
870
791
871
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
873
}
794
874
795
875
if(quit_now){
797
877
goto mandos_end;
798
878
}
799
879
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
885
803
886
if(quit_now){
804
887
errno = EINTR;
815
898
816
899
if(ret != GNUTLS_E_SUCCESS){
817
900
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
902
gnutls_perror(ret);
820
903
}
821
904
errno = EPROTO;
825
908
/* Read OpenPGP packet that contains the wanted password */
826
909
827
910
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
912
" %s\n", ip);
830
913
}
831
914
832
915
while(true){
837
920
}
838
921
839
922
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
923
buffer_capacity);
841
924
if(buffer_capacity == 0){
842
925
int e = errno;
843
926
perror_plus("incbuffer");
870
953
}
871
954
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
955
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
957
"***\n");
874
958
gnutls_perror(ret);
875
959
errno = EPROTO;
876
960
goto mandos_end;
877
961
}
878
962
break;
879
963
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
882
966
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
967
errno = EIO;
884
968
goto mandos_end;
889
973
}
890
974
891
975
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
976
fprintf_plus(stderr, "Closing TLS session\n");
893
977
}
894
978
895
979
if(quit_now){
907
991
908
992
if(buffer_length > 0){
909
993
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
913
996
if(decrypted_buffer_size >= 0){
914
997
915
998
written = 0;
925
1008
if(ret == 0 and ferror(stdout)){
926
1009
int e = errno;
927
1010
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1012
strerror(errno));
930
1013
}
931
1014
errno = e;
932
1015
goto mandos_end;
963
1046
return retval;
964
1047
}
965
1048
1049
__attribute__((nonnull))
966
1050
static void resolve_callback(AvahiSServiceResolver *r,
967
1051
AvahiIfIndex interface,
968
1052
AvahiProtocol proto,
976
1060
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1062
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
981
1067
982
1068
/* Called whenever a service has been resolved successfully or
983
1069
timed out */
989
1075
switch(event){
990
1076
default:
991
1077
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1078
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
995
1083
break;
996
1084
997
1085
case AVAHI_RESOLVER_FOUND:
999
1087
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1088
avahi_address_snprint(ip, sizeof(ip), address);
1001
1089
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1090
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1091
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
host_name, ip, (intmax_t)interface, port);
1005
1093
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
1008
1098
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1099
avahi_simple_poll_quit(simple_poll);
1010
1100
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1104
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
" list\n", name);
1106
}
1013
1107
}
1014
1108
}
1015
1109
}
1025
1119
const char *domain,
1026
1120
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1121
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
1030
1126
1031
1127
/* Called whenever a new services becomes available on the LAN or
1032
1128
is removed from the LAN */
1039
1135
default:
1040
1136
case AVAHI_BROWSER_FAILURE:
1041
1137
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1138
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
1045
1142
return;
1046
1143
1047
1144
case AVAHI_BROWSER_NEW:
1050
1147
the callback function is called the Avahi server will free the
1051
1148
resolver for us. */
1052
1149
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1154
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
1058
1158
break;
1059
1159
1060
1160
case AVAHI_BROWSER_REMOVE:
1063
1163
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1164
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1165
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1166
fprintf_plus(stderr, "No Mandos server found, still"
1167
" searching...\n");
1067
1168
}
1068
1169
break;
1069
1170
}
1078
1179
signal_received = sig;
1079
1180
int old_errno = errno;
1080
1181
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1083
1184
}
1084
1185
errno = old_errno;
1085
1186
}
1086
1187
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int ret;
1191
error_t ret_errno;
1192
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
if(s < 0){
1195
ret_errno = errno;
1196
perror_plus("socket");
1197
errno = ret_errno;
1198
return false;
1199
}
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
if(ret == -1){
1203
if(debug){
1204
ret_errno = errno;
1205
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1207
}
1208
return false;
1209
}
1210
return true;
1211
}
1212
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1216
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
ifname);
1221
}
1222
return false;
1223
}
1224
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1226
if(debug){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1229
}
1230
return true;
1231
}
1232
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1234
if(debug){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return false;
1239
}
1240
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
ifname);
1245
}
1246
return false;
1247
}
1248
1249
/* Accept this device */
1250
if(debug){
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
}
1253
return true;
1254
}
1255
1087
1256
/*
1088
1257
* This function determines if a directory entry in /sys/class/net
1089
1258
* corresponds to an acceptable network device.
1090
1259
* (This function is passed to scandir(3) as a filter function.)
1091
1260
*/
1261
__attribute__((nonnull, warn_unused_result))
1092
1262
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1263
if(if_entry->d_name[0] == '.'){
1096
1264
return 0;
1097
1265
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1266
1267
struct ifreq ifr;
1268
if(not get_flags(if_entry->d_name, &ifr)){
1269
if(debug){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1272
}
1273
return 0;
1274
}
1275
1276
if(not good_flags(if_entry->d_name, &ifr)){
1277
return 0;
1188
1278
}
1189
1279
return 1;
1190
1280
}
1191
1281
1282
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1192
1317
int notdotentries(const struct dirent *direntry){
1193
1318
/* Skip "." and ".." */
1194
1319
if(direntry->d_name[0] == '.'
1200
1325
return 1;
1201
1326
}
1202
1327
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1331
int ret;
1332
size_t sret;
1333
struct stat st;
1334
1335
if((direntry->d_name)[0] == '\0'){
1336
/* Empty name? */
1337
return 0;
1338
}
1339
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1342
"0123456789"
1343
"_.-");
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1204
1386
int ret;
1205
1387
struct timespec now;
1206
1388
struct timespec waited_time;
1207
1389
intmax_t block_time;
1208
1390
1209
1391
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1214
1396
}
1215
1397
ret = avahi_simple_poll_iterate(s, -1);
1216
1398
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1220
1402
}
1221
1403
/* the current time */
1222
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1409
/* Calculating in ms how long time between now and server
1228
1410
who we visted longest time ago. Now - last seen. */
1229
1411
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1412
- mc->current_server->last_seen.tv_sec);
1231
1413
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1414
- mc->current_server->last_seen.tv_nsec);
1233
1415
/* total time is 10s/10,000ms.
1234
1416
Converting to s from ms by dividing by 1,000,
1235
1417
and ns to ms by dividing by 1,000,000. */
1236
1418
block_time = ((retry_interval
1237
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1242
1425
}
1243
1426
1244
1427
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1249
1432
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1433
avahi_simple_poll_quit(s);
1251
1434
return 0;
1252
1435
}
1253
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1437
&mc->current_server->last_seen);
1255
1438
if(ret == -1){
1256
1439
perror_plus("clock_gettime");
1257
1440
return -1;
1258
1441
}
1259
mc.current_server = mc.current_server->next;
1442
mc->current_server = mc->current_server->next;
1260
1443
block_time = 0; /* Call avahi to find new Mandos
1261
1444
servers, but don't block */
1262
1445
}
1264
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1448
}
1266
1449
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1450
if(ret > 0 or errno != EINTR){
1268
1451
return (ret != 1) ? ret : 0;
1269
1452
}
1270
1453
}
1271
1454
}
1272
1455
}
1273
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
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
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1511
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
if(numhooks == -1){
1540
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1796
break;
1797
}
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1882
}
1883
1274
1884
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1275
1889
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1890
error_t ret_errno;
1277
1891
int ret;
1278
1892
intmax_t tmpmax;
1279
1893
char *tmp;
1280
1894
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1289
1900
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
1901
const char *seckey = PATHDIR "/" SECKEY;
1291
1902
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1292
1904
1293
1905
bool gnutls_initialized = false;
1294
1906
bool gpgme_initialized = false;
1356
1968
.group = 2 },
1357
1969
{ .name = "retry", .key = 132,
1358
1970
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1971
.doc = "Retry interval used when denied by the Mandos server",
1972
.group = 2 },
1973
{ .name = "network-hook-dir", .key = 133,
1974
.arg = "DIR",
1975
.doc = "Directory where network hooks are located",
1360
1976
.group = 2 },
1361
1977
/*
1362
1978
* These reproduce what we would get without ARGP_NO_HELP
1381
1997
connect_to = arg;
1382
1998
break;
1383
1999
case 'i': /* --interface */
1384
interface = arg;
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
1385
2005
break;
1386
2006
case 's': /* --seckey */
1387
2007
seckey = arg;
1411
2031
errno = 0;
1412
2032
retry_interval = strtod(arg, &tmp);
1413
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
2034
or (retry_interval * 1000) > INT_MAX
2035
or retry_interval < 0){
1415
2036
argp_error(state, "Bad retry interval");
1416
2037
}
1417
2038
break;
2039
case 133: /* --network-hook-dir */
2040
hookdir = arg;
2041
break;
1418
2042
/*
1419
2043
* These reproduce what we would get without ARGP_NO_HELP
1420
2044
*/
1426
2050
argp_state_help(state, state->out_stream,
1427
2051
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
2052
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
2054
exit(argp_err_exit_status);
1431
2055
break;
1432
2056
default:
1459
2083
{
1460
2084
/* Work around Debian bug #633582:
1461
2085
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
2086
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
2092
} else {
2093
struct stat st;
2094
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
}
2114
}
2115
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2120
} else {
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2122
if(ret == -1){
2123
perror_plus("fstat");
2124
} else {
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2128
if(ret == -1){
2129
perror_plus("fchown");
2130
}
2131
}
2132
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
2159
}
2160
}
2161
}
2162
2163
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
1513
2176
}
1514
2177
1515
2178
if(not debug){
1516
2179
avahi_set_log_function(empty_log);
1517
2180
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
1543
2181
1544
2182
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
2183
from the signal handler */
1546
2184
/* Initialize the pseudo-RNG for Avahi */
1547
2185
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
1551
2190
exitcode = EX_UNAVAILABLE;
1552
2191
goto end;
1553
2192
}
1615
2254
}
1616
2255
}
1617
2256
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
2279
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
1703
2306
}
1704
2307
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
2308
break;
1723
2309
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2332
if(debug){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
2337
}
1762
2338
1763
2339
if(quit_now){
1764
2340
goto end;
1765
2341
}
1766
2342
1767
ret = init_gnutls_global(pubkey, seckey);
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
1768
2344
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2346
exitcode = EX_UNAVAILABLE;
1771
2347
goto end;
1772
2348
} else {
1777
2353
goto end;
1778
2354
}
1779
2355
1780
if(mkdtemp(tempdir) == NULL){
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
1781
2366
perror_plus("mkdtemp");
1782
2367
goto end;
1783
2368
}
1784
tempdir_created = true;
1785
2369
1786
2370
if(quit_now){
1787
2371
goto end;
1788
2372
}
1789
2373
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2376
exitcode = EX_UNAVAILABLE;
1793
2377
goto end;
1794
2378
} else {
1803
2387
/* Connect directly, do not use Zeroconf */
1804
2388
/* (Mainly meant for debugging) */
1805
2389
char *address = strrchr(connect_to, ':');
2390
1806
2391
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2392
fprintf_plus(stderr, "No colon in address\n");
1808
2393
exitcode = EX_USAGE;
1809
2394
goto end;
1810
2395
}
1813
2398
goto end;
1814
2399
}
1815
2400
1816
uint16_t port;
2401
in_port_t port;
1817
2402
errno = 0;
1818
2403
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
1822
2407
exitcode = EX_USAGE;
1823
2408
goto end;
1824
2409
}
1825
2410
1826
2411
if(quit_now){
1827
2412
goto end;
1828
2413
}
1829
2414
1830
port = (uint16_t)tmpmax;
2415
port = (in_port_t)tmpmax;
1831
2416
*address = '\0';
1832
address = connect_to;
1833
2417
/* Colon in address indicates IPv6 */
1834
2418
int af;
1835
if(strchr(address, ':') != NULL){
2419
if(strchr(connect_to, ':') != NULL){
1836
2420
af = AF_INET6;
2421
/* Accept [] around IPv6 address - see RFC 5952 */
2422
if(connect_to[0] == '[' and address[-1] == ']')
2423
{
2424
connect_to++;
2425
address[-1] = '\0';
2426
}
1837
2427
} else {
1838
2428
af = AF_INET;
1839
2429
}
2430
address = connect_to;
1840
2431
1841
2432
if(quit_now){
1842
2433
goto end;
1843
2434
}
1844
2435
1845
2436
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
1847
2439
if(quit_now or ret == 0){
1848
2440
break;
1849
2441
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
2442
if(debug){
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
2445
}
2446
sleep((unsigned int)retry_interval);
2447
}
2448
2449
if(not quit_now){
1854
2450
exitcode = EXIT_SUCCESS;
1855
2451
}
1856
2452
1857
2453
goto end;
1858
2454
}
1859
2455
1871
2467
config.publish_domain = 0;
1872
2468
1873
2469
/* Allocate a new server */
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
1877
2472
1878
2473
/* Free the Avahi configuration data */
1879
2474
avahi_server_config_free(&config);
1881
2476
1882
2477
/* Check if creating the Avahi server object succeeded */
1883
2478
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
1886
2481
exitcode = EX_UNAVAILABLE;
1887
2482
goto end;
1888
2483
}
1894
2489
/* Create the Avahi service browser */
1895
2490
sb = avahi_s_service_browser_new(mc.server, if_index,
1896
2491
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
1898
2494
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
1901
2497
exitcode = EX_UNAVAILABLE;
1902
2498
goto end;
1903
2499
}
1909
2505
/* Run the main loop */
1910
2506
1911
2507
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2509
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2510
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
1917
2513
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
1920
2516
}
1921
2517
1922
2518
end:
1923
2519
1924
2520
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2522
}
1927
2523
1928
2524
/* Cleanup things */
2525
free(mc.interfaces);
2526
1929
2527
if(sb != NULL)
1930
2528
avahi_s_service_browser_free(sb);
1931
2529
1932
2530
if(mc.server != NULL)
1933
2531
avahi_server_free(mc.server);
1934
2532
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
1937
2535
1938
2536
if(gnutls_initialized){
1939
2537
gnutls_certificate_free_credentials(mc.cred);
1944
2542
if(gpgme_initialized){
1945
2543
gpgme_release(mc.ctx);
1946
2544
}
1947
2545
1948
2546
/* Cleans up the circular linked list of Mandos servers the client
1949
2547
has seen */
1950
2548
if(mc.current_server != NULL){
1956
2554
}
1957
2555
}
1958
2556
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
2557
/* Re-raise privileges */
2558
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
1966
2586
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
2587
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
1988
2592
}
1989
2593
}
1990
2594
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2597
1991
2598
/* Removes the GPGME temp directory and all files inside */
1992
if(tempdir_created){
2599
if(tempdir != NULL){
1993
2600
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
direntry->d_name);
2002
if(ret < 0){
2003
perror_plus("asprintf");
2004
continue;
2005
}
2006
ret = remove(fullname);
2007
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2010
}
2011
free(fullname);
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2012
2637
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
2020
}
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2024
2639
}
2025
2640
}
2026
2641
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0