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237.7.241
(compared to revision 24.1.176)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-06-07 22:37:22 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140607223722-55qmdr3n9x39pvx4
Make mandos-client use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
- 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
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
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
#include <arpa/inet.h> /* inet_pton(), htons() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
88
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89
98
#ifdef __linux__
90
99
#include <sys/klog.h> /* klogctl() */
108
117
init_gnutls_session(),
109
118
GNUTLS_* */
110
119
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
113
122
114
123
/* GPGME */
115
124
#include <gpgme.h> /* All GPGME types, constants and
123
132
#define PATHDIR "/conf/conf.d/mandos"
124
133
#define SECKEY "seckey.txt"
125
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
136
127
137
bool debug = false;
128
138
static const char mandos_protocol_version[] = "1";
129
139
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
141
static const char sys_class_net[] = "/sys/class/net";
132
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
133
147
134
148
/* Doubly linked list that need to be circularly linked when used */
135
149
typedef struct server{
136
150
const char *ip;
137
uint16_t port;
151
in_port_t port;
138
152
AvahiIfIndex if_index;
139
153
int af;
140
154
struct timespec last_seen;
144
158
145
159
/* Used for passing in values through the Avahi callback functions */
146
160
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
161
AvahiServer *server;
149
162
gnutls_certificate_credentials_t cred;
150
163
unsigned int dh_bits;
152
165
const char *priority;
153
166
gpgme_ctx_t ctx;
154
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
155
170
} mandos_context;
156
171
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 };
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
162
174
163
175
sig_atomic_t quit_now = 0;
164
176
int signal_received = 0;
165
177
166
178
/* Function to use when printing errors */
167
179
void perror_plus(const char *print_text){
180
int e = errno;
168
181
fprintf(stderr, "Mandos plugin %s: ",
169
182
program_invocation_short_name);
183
errno = e;
170
184
perror(print_text);
171
185
}
172
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
196
173
197
/*
174
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
199
* bytes. "buffer_capacity" is how much is currently allocated,
176
200
* "buffer_length" is how much is already used.
177
201
*/
202
__attribute__((nonnull, warn_unused_result))
178
203
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
204
size_t buffer_capacity){
180
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
183
212
return 0;
184
213
}
214
*buffer = new_buf;
185
215
buffer_capacity += BUFFER_SIZE;
186
216
}
187
217
return buffer_capacity;
188
218
}
189
219
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
193
224
int ret;
194
225
server *new_server = malloc(sizeof(server));
195
226
if(new_server == NULL){
196
227
perror_plus("malloc");
197
return -1;
228
return false;
198
229
}
199
230
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
231
.port = port,
232
.if_index = if_index,
233
.af = af };
203
234
if(new_server->ip == NULL){
204
235
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
209
245
new_server->next = new_server;
210
246
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
247
*current_server = new_server;
213
248
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
216
252
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;
253
(*current_server)->prev = new_server;
254
}
255
return true;
225
256
}
226
257
227
258
/*
228
259
* Initialize GPGME.
229
260
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
232
266
gpgme_error_t rc;
233
267
gpgme_engine_info_t engine_info;
234
268
235
236
269
/*
237
270
* Helper function to insert pub and seckey to the engine keyring.
238
271
*/
239
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
240
273
int ret;
241
274
int fd;
242
275
gpgme_data_t pgp_data;
249
282
250
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
284
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));
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
254
287
return false;
255
288
}
256
289
257
rc = gpgme_op_import(mc.ctx, pgp_data);
290
rc = gpgme_op_import(mc->ctx, pgp_data);
258
291
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
261
294
return false;
262
295
}
263
296
270
303
}
271
304
272
305
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
306
fprintf_plus(stderr, "Initializing GPGME\n");
274
307
}
275
308
276
309
/* Init GPGME */
277
310
gpgme_check_version(NULL);
278
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
312
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
282
315
return false;
283
316
}
284
317
285
/* Set GPGME home directory for the OpenPGP engine only */
318
/* Set GPGME home directory for the OpenPGP engine only */
286
319
rc = gpgme_get_engine_info(&engine_info);
287
320
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
290
323
return false;
291
324
}
292
325
while(engine_info != NULL){
298
331
engine_info = engine_info->next;
299
332
}
300
333
if(engine_info == NULL){
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
302
336
return false;
303
337
}
304
338
305
339
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
340
rc = gpgme_new(&(mc->ctx));
307
341
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
310
345
return false;
311
346
}
312
347
321
356
* Decrypt OpenPGP data.
322
357
* Returns -1 on error
323
358
*/
359
__attribute__((nonnull, warn_unused_result))
324
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
361
size_t crypto_size,
326
char **plaintext){
362
char **plaintext,
363
mandos_context *mc){
327
364
gpgme_data_t dh_crypto, dh_plain;
328
365
gpgme_error_t rc;
329
366
ssize_t ret;
331
368
ssize_t plaintext_length = 0;
332
369
333
370
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
372
}
336
373
337
374
/* Create new GPGME data buffer from memory cryptotext */
338
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
376
0);
340
377
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));
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
343
380
return -1;
344
381
}
345
382
346
383
/* Create new empty GPGME data buffer for the plaintext */
347
384
rc = gpgme_data_new(&dh_plain);
348
385
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
351
389
gpgme_data_release(dh_crypto);
352
390
return -1;
353
391
}
354
392
355
393
/* Decrypt data from the cryptotext data buffer to the plaintext
356
394
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
396
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
361
399
plaintext_length = -1;
362
400
if(debug){
363
401
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
365
403
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
405
} 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);
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
372
410
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
412
}
375
413
gpgme_recipient_t recipient;
376
414
recipient = result->recipients;
377
415
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");
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
384
423
recipient = recipient->next;
385
424
}
386
425
}
389
428
}
390
429
391
430
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
432
}
394
433
395
434
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
441
*plaintext = NULL;
403
442
while(true){
404
443
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
444
(size_t)plaintext_length,
445
plaintext_capacity);
407
446
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
411
450
}
412
451
413
452
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
465
}
427
466
428
467
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
430
469
for(ssize_t i = 0; i < plaintext_length; i++){
431
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
471
}
443
482
return plaintext_length;
444
483
}
445
484
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
449
488
if(ret == NULL)
450
489
ret = "(unknown)";
451
490
return ret;
452
491
}
453
492
454
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
455
495
static void debuggnutls(__attribute__((unused)) int level,
456
496
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
458
498
}
459
499
500
__attribute__((nonnull, warn_unused_result))
460
501
static int init_gnutls_global(const char *pubkeyfilename,
461
const char *seckeyfilename){
502
const char *seckeyfilename,
503
mandos_context *mc){
462
504
int ret;
463
505
464
506
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
508
}
467
509
468
510
ret = gnutls_global_init();
469
511
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
472
514
return -1;
473
515
}
474
516
481
523
}
482
524
483
525
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
527
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
488
530
gnutls_global_deinit();
489
531
return -1;
490
532
}
491
533
492
534
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
496
539
}
497
540
498
541
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
542
(mc->cred, pubkeyfilename, seckeyfilename,
500
543
GNUTLS_OPENPGP_FMT_BASE64);
501
544
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));
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
507
550
goto globalfail;
508
551
}
509
552
510
553
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
554
ret = gnutls_dh_params_init(&mc->dh_params);
512
555
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
515
559
goto globalfail;
516
560
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
562
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
521
565
goto globalfail;
522
566
}
523
567
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
569
526
570
return 0;
527
571
528
572
globalfail:
529
573
530
gnutls_certificate_free_credentials(mc.cred);
574
gnutls_certificate_free_credentials(mc->cred);
531
575
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
576
gnutls_dh_params_deinit(mc->dh_params);
533
577
return -1;
534
578
}
535
579
536
static int init_gnutls_session(gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
537
583
int ret;
538
584
/* GnuTLS session creation */
539
585
do {
543
589
}
544
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
591
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
548
595
}
549
596
550
597
{
551
598
const char *err;
552
599
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
601
if(quit_now){
555
602
gnutls_deinit(*session);
556
603
return -1;
557
604
}
558
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
606
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));
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
563
610
gnutls_deinit(*session);
564
611
return -1;
565
612
}
567
614
568
615
do {
569
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
617
mc->cred);
571
618
if(quit_now){
572
619
gnutls_deinit(*session);
573
620
return -1;
574
621
}
575
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
623
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
579
626
gnutls_deinit(*session);
580
627
return -1;
581
628
}
583
630
/* ignore client certificate if any. */
584
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
632
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
634
588
635
return 0;
589
636
}
593
640
__attribute__((unused)) const char *txt){}
594
641
595
642
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
597
645
AvahiIfIndex if_index,
598
int af){
646
int af, mandos_context *mc){
599
647
int ret, tcp_sd = -1;
600
648
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
649
struct sockaddr_storage to;
605
650
char *buffer = NULL;
606
651
char *decrypted_buffer = NULL;
607
652
size_t buffer_length = 0;
626
671
pf = PF_INET;
627
672
break;
628
673
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
675
errno = EINVAL;
631
676
return -1;
632
677
}
633
678
634
ret = init_gnutls_session(&session);
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
707
return -1;
708
}
709
}
710
711
ret = init_gnutls_session(&session, mc);
635
712
if(ret != 0){
636
713
return -1;
637
714
}
638
715
639
716
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
642
719
}
643
720
644
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
656
733
657
734
memset(&to, 0, sizeof(to));
658
735
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
661
738
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
664
741
}
665
742
if(ret < 0 ){
666
743
int e = errno;
670
747
}
671
748
if(ret == 0){
672
749
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
751
errno = e;
675
752
goto mandos_end;
676
753
}
677
754
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*/
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
685
758
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
688
761
errno = EINVAL;
689
762
goto mandos_end;
690
763
}
691
764
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
766
}
694
767
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
698
769
}
699
770
700
771
if(quit_now){
708
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
780
perror_plus("if_indextoname");
710
781
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
713
784
}
714
785
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
717
788
}
718
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
791
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
724
796
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
727
801
}
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
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
808
}
735
809
}
736
810
740
814
}
741
815
742
816
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
744
819
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
746
822
}
747
823
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
825
int e = errno;
750
826
perror_plus("connect");
751
827
errno = e;
763
839
while(true){
764
840
size_t out_size = strlen(out);
765
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
842
out_size - written));
767
843
if(ret == -1){
768
844
int e = errno;
769
845
perror_plus("write");
789
865
}
790
866
791
867
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
869
}
794
870
795
871
if(quit_now){
797
873
goto mandos_end;
798
874
}
799
875
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
881
803
882
if(quit_now){
804
883
errno = EINTR;
815
894
816
895
if(ret != GNUTLS_E_SUCCESS){
817
896
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
898
gnutls_perror(ret);
820
899
}
821
900
errno = EPROTO;
825
904
/* Read OpenPGP packet that contains the wanted password */
826
905
827
906
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
830
909
}
831
910
832
911
while(true){
837
916
}
838
917
839
918
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
919
buffer_capacity);
841
920
if(buffer_capacity == 0){
842
921
int e = errno;
843
922
perror_plus("incbuffer");
870
949
}
871
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
951
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
874
954
gnutls_perror(ret);
875
955
errno = EPROTO;
876
956
goto mandos_end;
877
957
}
878
958
break;
879
959
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
882
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
963
errno = EIO;
884
964
goto mandos_end;
889
969
}
890
970
891
971
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
972
fprintf_plus(stderr, "Closing TLS session\n");
893
973
}
894
974
895
975
if(quit_now){
907
987
908
988
if(buffer_length > 0){
909
989
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
913
992
if(decrypted_buffer_size >= 0){
914
993
915
994
written = 0;
925
1004
if(ret == 0 and ferror(stdout)){
926
1005
int e = errno;
927
1006
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
930
1009
}
931
1010
errno = e;
932
1011
goto mandos_end;
963
1042
return retval;
964
1043
}
965
1044
1045
__attribute__((nonnull))
966
1046
static void resolve_callback(AvahiSServiceResolver *r,
967
1047
AvahiIfIndex interface,
968
1048
AvahiProtocol proto,
976
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1058
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
981
1063
982
1064
/* Called whenever a service has been resolved successfully or
983
1065
timed out */
989
1071
switch(event){
990
1072
default:
991
1073
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)));
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
995
1079
break;
996
1080
997
1081
case AVAHI_RESOLVER_FOUND:
999
1083
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1084
avahi_address_snprint(ip, sizeof(ip), address);
1001
1085
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);
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
1005
1089
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1008
1094
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1095
avahi_simple_poll_quit(simple_poll);
1010
1096
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
1013
1103
}
1014
1104
}
1015
1105
}
1025
1115
const char *domain,
1026
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1117
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
1030
1122
1031
1123
/* Called whenever a new services becomes available on the LAN or
1032
1124
is removed from the LAN */
1039
1131
default:
1040
1132
case AVAHI_BROWSER_FAILURE:
1041
1133
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
1045
1138
return;
1046
1139
1047
1140
case AVAHI_BROWSER_NEW:
1050
1143
the callback function is called the Avahi server will free the
1051
1144
resolver for us. */
1052
1145
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)));
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
1058
1154
break;
1059
1155
1060
1156
case AVAHI_BROWSER_REMOVE:
1063
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1161
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
1067
1164
}
1068
1165
break;
1069
1166
}
1078
1175
signal_received = sig;
1079
1176
int old_errno = errno;
1080
1177
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1083
1180
}
1084
1181
errno = old_errno;
1085
1182
}
1086
1183
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1087
1252
/*
1088
1253
* This function determines if a directory entry in /sys/class/net
1089
1254
* corresponds to an acceptable network device.
1090
1255
* (This function is passed to scandir(3) as a filter function.)
1091
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1092
1258
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1259
if(if_entry->d_name[0] == '.'){
1096
1260
return 0;
1097
1261
}
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);
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1188
1274
}
1189
1275
return 1;
1190
1276
}
1191
1277
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1192
1313
int notdotentries(const struct dirent *direntry){
1193
1314
/* Skip "." and ".." */
1194
1315
if(direntry->d_name[0] == '.'
1200
1321
return 1;
1201
1322
}
1202
1323
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1350
if(ret == -1){
1351
if(debug){
1352
perror_plus("Could not stat hook");
1353
}
1354
return 0;
1355
}
1356
if(not (S_ISREG(st.st_mode))){
1357
/* Not a regular file */
1358
if(debug){
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1360
direntry->d_name);
1361
}
1362
return 0;
1363
}
1364
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1365
/* Not executable */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(debug){
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1374
direntry->d_name);
1375
}
1376
return 1;
1377
}
1378
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1204
1382
int ret;
1205
1383
struct timespec now;
1206
1384
struct timespec waited_time;
1207
1385
intmax_t block_time;
1208
1386
1209
1387
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1388
if(mc->current_server == NULL){
1389
if(debug){
1390
fprintf_plus(stderr, "Wait until first server is found."
1391
" No timeout!\n");
1214
1392
}
1215
1393
ret = avahi_simple_poll_iterate(s, -1);
1216
1394
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1395
if(debug){
1396
fprintf_plus(stderr, "Check current_server if we should run"
1397
" it, or wait\n");
1220
1398
}
1221
1399
/* the current time */
1222
1400
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1405
/* Calculating in ms how long time between now and server
1228
1406
who we visted longest time ago. Now - last seen. */
1229
1407
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1408
- mc->current_server->last_seen.tv_sec);
1231
1409
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1410
- mc->current_server->last_seen.tv_nsec);
1233
1411
/* total time is 10s/10,000ms.
1234
1412
Converting to s from ms by dividing by 1,000,
1235
1413
and ns to ms by dividing by 1,000,000. */
1236
1414
block_time = ((retry_interval
1237
1415
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1416
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1417
1418
if(debug){
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
block_time);
1242
1421
}
1243
1422
1244
1423
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);
1424
ret = start_mandos_communication(mc->current_server->ip,
1425
mc->current_server->port,
1426
mc->current_server->if_index,
1427
mc->current_server->af, mc);
1249
1428
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1429
avahi_simple_poll_quit(s);
1251
1430
return 0;
1252
1431
}
1253
1432
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1433
&mc->current_server->last_seen);
1255
1434
if(ret == -1){
1256
1435
perror_plus("clock_gettime");
1257
1436
return -1;
1258
1437
}
1259
mc.current_server = mc.current_server->next;
1438
mc->current_server = mc->current_server->next;
1260
1439
block_time = 0; /* Call avahi to find new Mandos
1261
1440
servers, but don't block */
1262
1441
}
1264
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1444
}
1266
1445
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1446
if(ret > 0 or errno != EINTR){
1268
1447
return (ret != 1) ? ret : 0;
1269
1448
}
1270
1449
}
1271
1450
}
1272
1451
}
1273
1452
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1530
const float delay){
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1542
if(debug){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1545
}
1546
} else {
1547
perror_plus("open");
1548
}
1549
return;
1550
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1575
if(numhooks == -1){
1576
perror_plus("scandir");
1577
return;
1578
}
1579
struct dirent *direntry;
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1584
if(debug){
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1586
direntry->d_name);
1587
}
1588
pid_t hook_pid = fork();
1589
if(hook_pid == 0){
1590
/* Child */
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1594
_exit(EX_NOPERM);
1595
}
1596
/* Set group */
1597
errno = 0;
1598
ret = setgid(0);
1599
if(ret == -1){
1600
perror_plus("setgid");
1601
_exit(EX_NOPERM);
1602
}
1603
/* Reset supplementary groups */
1604
errno = 0;
1605
ret = setgroups(0, NULL);
1606
if(ret == -1){
1607
perror_plus("setgroups");
1608
_exit(EX_NOPERM);
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1626
if(ret == -1){
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
ret = setenv("DEVICE", interface, 1);
1631
if(ret == -1){
1632
perror_plus("setenv");
1633
_exit(EX_OSERR);
1634
}
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
_exit(EX_OSERR);
1639
}
1640
ret = setenv("MODE", mode, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
_exit(EX_OSERR);
1644
}
1645
char *delaystring;
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1647
if(ret == -1){
1648
perror_plus("asprintf");
1649
_exit(EX_OSERR);
1650
}
1651
ret = setenv("DELAY", delaystring, 1);
1652
if(ret == -1){
1653
free(delaystring);
1654
perror_plus("setenv");
1655
_exit(EX_OSERR);
1656
}
1657
free(delaystring);
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1660
if(ret == -1){
1661
perror_plus("setenv");
1662
_exit(EX_OSERR);
1663
}
1664
}
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1669
}
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
continue;
1675
}
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1681
continue;
1682
}
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1686
WTERMSIG(status));
1687
continue;
1688
} else {
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1691
continue;
1692
}
1693
}
1694
if(debug){
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1696
direntry->d_name);
1697
}
1698
}
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1701
} else {
1702
hookdir_fd = -1;
1703
}
1704
close(devnull);
1705
}
1706
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
1711
int ret;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1714
if(if_index == 0){
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1716
errno = old_errno;
1717
return ENXIO;
1718
}
1719
1720
if(quit_now){
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1728
ret_errno = errno;
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
network.ifr_flags |= IFF_UP; /* set flag */
1735
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1737
if(sd == -1){
1738
ret_errno = errno;
1739
perror_plus("socket");
1740
errno = old_errno;
1741
return ret_errno;
1742
}
1743
1744
if(quit_now){
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1746
if(ret == -1){
1747
perror_plus("close");
1748
}
1749
errno = old_errno;
1750
return EINTR;
1751
}
1752
1753
if(debug){
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1755
interface);
1756
}
1757
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1760
if(ret_errno != 0){
1761
perror_plus("Failed to raise privileges");
1762
}
1763
1764
#ifdef __linux__
1765
int ret_linux;
1766
bool restore_loglevel = false;
1767
if(ret_errno == 0){
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1773
} else {
1774
restore_loglevel = true;
1775
}
1776
}
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1780
#ifdef __linux__
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1785
}
1786
}
1787
#endif /* __linux__ */
1788
1789
/* If raise_privileges() succeeded above */
1790
if(ret_errno == 0){
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1793
if(ret_errno != 0){
1794
errno = ret_errno;
1795
perror_plus("Failed to lower privileges");
1796
}
1797
}
1798
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1801
if(ret == -1){
1802
perror_plus("close");
1803
}
1804
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1808
errno = old_errno;
1809
return ioctl_errno;
1810
}
1811
} else if(debug){
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1813
interface);
1814
}
1815
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1820
break;
1821
}
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1826
}
1827
}
1828
1829
errno = old_errno;
1830
return 0;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1838
if(if_index == 0){
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1840
errno = old_errno;
1841
return ENXIO;
1842
}
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1846
ret_errno = errno;
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1849
errno = old_errno;
1850
return ret_errno;
1851
}
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1853
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1855
if(sd == -1){
1856
ret_errno = errno;
1857
perror_plus("socket");
1858
errno = old_errno;
1859
return ret_errno;
1860
}
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1864
interface);
1865
}
1866
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1869
if(ret_errno != 0){
1870
perror_plus("Failed to raise privileges");
1871
}
1872
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1875
1876
/* If raise_privileges() succeeded above */
1877
if(ret_errno == 0){
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1880
if(ret_errno != 0){
1881
errno = ret_errno;
1882
perror_plus("Failed to lower privileges");
1883
}
1884
}
1885
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1888
if(ret == -1){
1889
perror_plus("close");
1890
}
1891
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1895
errno = old_errno;
1896
return ioctl_errno;
1897
}
1898
} else if(debug){
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1900
interface);
1901
}
1902
1903
errno = old_errno;
1904
return 0;
1905
}
1906
1274
1907
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
1275
1912
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1913
error_t ret_errno;
1277
1914
int ret;
1278
1915
intmax_t tmpmax;
1279
1916
char *tmp;
1280
1917
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;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
1289
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
1924
const char *seckey = PATHDIR "/" SECKEY;
1291
1925
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1292
1927
1293
1928
bool gnutls_initialized = false;
1294
1929
bool gpgme_initialized = false;
1356
1991
.group = 2 },
1357
1992
{ .name = "retry", .key = 132,
1358
1993
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1994
.doc = "Retry interval used when denied by the Mandos server",
1995
.group = 2 },
1996
{ .name = "network-hook-dir", .key = 133,
1997
.arg = "DIR",
1998
.doc = "Directory where network hooks are located",
1360
1999
.group = 2 },
1361
2000
/*
1362
2001
* These reproduce what we would get without ARGP_NO_HELP
1381
2020
connect_to = arg;
1382
2021
break;
1383
2022
case 'i': /* --interface */
1384
interface = arg;
2023
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2024
arg, (int)',');
2025
if(ret_errno != 0){
2026
argp_error(state, "%s", strerror(ret_errno));
2027
}
1385
2028
break;
1386
2029
case 's': /* --seckey */
1387
2030
seckey = arg;
1411
2054
errno = 0;
1412
2055
retry_interval = strtod(arg, &tmp);
1413
2056
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
2057
or (retry_interval * 1000) > INT_MAX
2058
or retry_interval < 0){
1415
2059
argp_error(state, "Bad retry interval");
1416
2060
}
1417
2061
break;
2062
case 133: /* --network-hook-dir */
2063
hookdir = arg;
2064
break;
1418
2065
/*
1419
2066
* These reproduce what we would get without ARGP_NO_HELP
1420
2067
*/
1426
2073
argp_state_help(state, state->out_stream,
1427
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
2075
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
2077
exit(argp_err_exit_status);
1431
2078
break;
1432
2079
default:
1459
2106
{
1460
2107
/* Work around Debian bug #633582:
1461
2108
<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
}
2109
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2114
perror_plus("Failed to raise privileges");
2115
} else {
2116
struct stat st;
2117
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2122
} else {
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2124
if(ret == -1){
2125
perror_plus("fstat");
2126
} else {
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2130
if(ret == -1){
2131
perror_plus("fchown");
2132
}
2133
}
2134
}
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2136
}
2137
}
2138
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2143
} else {
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2145
if(ret == -1){
2146
perror_plus("fstat");
2147
} else {
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2151
if(ret == -1){
2152
perror_plus("fchown");
2153
}
2154
}
2155
}
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2164
perror_plus("Failed to lower privileges");
2165
}
2166
}
2167
}
2168
2169
/* Remove invalid interface names (except "none") */
2170
{
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2179
}
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2181
interface = NULL;
2182
}
2183
}
2184
}
2185
2186
/* Run network hooks */
2187
{
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
2192
goto end;
2193
}
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2196
}
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
1513
2199
}
1514
2200
1515
2201
if(not debug){
1516
2202
avahi_set_log_function(empty_log);
1517
2203
}
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
2204
1544
2205
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
2206
from the signal handler */
1546
2207
/* Initialize the pseudo-RNG for Avahi */
1547
2208
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");
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
1551
2213
exitcode = EX_UNAVAILABLE;
1552
2214
goto end;
1553
2215
}
1615
2277
}
1616
2278
}
1617
2279
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");
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2285
alphasort);
2286
if(ret >= 1){
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2291
if(ret_errno != 0){
2292
errno = ret_errno;
2293
perror_plus("argz_add");
2294
continue;
2295
}
2296
if(debug){
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2299
}
2300
}
2301
free(direntries);
2302
} else {
2303
free(direntries);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2306
goto end;
2307
}
2308
}
2309
2310
/* Bring up interfaces which are down, and remove any "none"s */
2311
{
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2314
interface))){
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
interface);
2326
interface = NULL;
1703
2327
}
1704
2328
}
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
2329
break;
1723
2330
}
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
}
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2334
if(errno != 0){
2335
perror_plus("Failed to bring up interface");
2336
} else {
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2339
interface);
2340
if(errno != 0){
2341
perror_plus("argz_add");
2342
}
2343
}
2344
}
2345
}
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2348
}
2349
}
2350
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2353
if(debug){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2355
mc.interfaces);
2356
}
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
2358
}
1762
2359
1763
2360
if(quit_now){
1764
2361
goto end;
1765
2362
}
1766
2363
1767
ret = init_gnutls_global(pubkey, seckey);
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
1768
2365
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2367
exitcode = EX_UNAVAILABLE;
1771
2368
goto end;
1772
2369
} else {
1777
2374
goto end;
1778
2375
}
1779
2376
1780
if(mkdtemp(tempdir) == NULL){
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2380
if(debug){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2383
}
2384
tempdir = mkdtemp(old_tempdir);
2385
}
2386
if(tempdir == NULL){
1781
2387
perror_plus("mkdtemp");
1782
2388
goto end;
1783
2389
}
1784
tempdir_created = true;
1785
2390
1786
2391
if(quit_now){
1787
2392
goto end;
1788
2393
}
1789
2394
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2397
exitcode = EX_UNAVAILABLE;
1793
2398
goto end;
1794
2399
} else {
1803
2408
/* Connect directly, do not use Zeroconf */
1804
2409
/* (Mainly meant for debugging) */
1805
2410
char *address = strrchr(connect_to, ':');
2411
1806
2412
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2413
fprintf_plus(stderr, "No colon in address\n");
1808
2414
exitcode = EX_USAGE;
1809
2415
goto end;
1810
2416
}
1813
2419
goto end;
1814
2420
}
1815
2421
1816
uint16_t port;
2422
in_port_t port;
1817
2423
errno = 0;
1818
2424
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2425
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
1822
2428
exitcode = EX_USAGE;
1823
2429
goto end;
1824
2430
}
1825
2431
1826
2432
if(quit_now){
1827
2433
goto end;
1828
2434
}
1829
2435
1830
port = (uint16_t)tmpmax;
2436
port = (in_port_t)tmpmax;
1831
2437
*address = '\0';
1832
address = connect_to;
1833
2438
/* Colon in address indicates IPv6 */
1834
2439
int af;
1835
if(strchr(address, ':') != NULL){
2440
if(strchr(connect_to, ':') != NULL){
1836
2441
af = AF_INET6;
2442
/* Accept [] around IPv6 address - see RFC 5952 */
2443
if(connect_to[0] == '[' and address[-1] == ']')
2444
{
2445
connect_to++;
2446
address[-1] = '\0';
2447
}
1837
2448
} else {
1838
2449
af = AF_INET;
1839
2450
}
2451
address = connect_to;
1840
2452
1841
2453
if(quit_now){
1842
2454
goto end;
1843
2455
}
1844
2456
1845
2457
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
2458
ret = start_mandos_communication(address, port, if_index, af,
2459
&mc);
1847
2460
if(quit_now or ret == 0){
1848
2461
break;
1849
2462
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
2463
if(debug){
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2466
}
2467
sleep((unsigned int)retry_interval);
2468
}
2469
2470
if(not quit_now){
1854
2471
exitcode = EXIT_SUCCESS;
1855
2472
}
1856
2473
1857
2474
goto end;
1858
2475
}
1859
2476
1871
2488
config.publish_domain = 0;
1872
2489
1873
2490
/* Allocate a new server */
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
1877
2493
1878
2494
/* Free the Avahi configuration data */
1879
2495
avahi_server_config_free(&config);
1881
2497
1882
2498
/* Check if creating the Avahi server object succeeded */
1883
2499
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
1886
2502
exitcode = EX_UNAVAILABLE;
1887
2503
goto end;
1888
2504
}
1894
2510
/* Create the Avahi service browser */
1895
2511
sb = avahi_s_service_browser_new(mc.server, if_index,
1896
2512
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
2513
NULL, 0, browse_callback,
2514
(void *)&mc);
1898
2515
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
1901
2518
exitcode = EX_UNAVAILABLE;
1902
2519
goto end;
1903
2520
}
1909
2526
/* Run the main loop */
1910
2527
1911
2528
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2530
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2531
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
1917
2534
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
1920
2537
}
1921
2538
1922
2539
end:
1923
2540
1924
2541
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2543
}
1927
2544
1928
2545
/* Cleanup things */
2546
free(mc.interfaces);
2547
1929
2548
if(sb != NULL)
1930
2549
avahi_s_service_browser_free(sb);
1931
2550
1932
2551
if(mc.server != NULL)
1933
2552
avahi_server_free(mc.server);
1934
2553
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
1937
2556
1938
2557
if(gnutls_initialized){
1939
2558
gnutls_certificate_free_credentials(mc.cred);
1944
2563
if(gpgme_initialized){
1945
2564
gpgme_release(mc.ctx);
1946
2565
}
1947
2566
1948
2567
/* Cleans up the circular linked list of Mandos servers the client
1949
2568
has seen */
1950
2569
if(mc.current_server != NULL){
1956
2575
}
1957
2576
}
1958
2577
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");
2578
/* Re-raise privileges */
2579
{
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
2582
perror_plus("Failed to raise privileges");
2583
} else {
2584
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
2589
/* Take down the network interfaces which were brought up */
2590
{
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
2598
perror_plus("Failed to take down interface");
2599
}
2600
}
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
" down\n");
2604
}
2605
}
1966
2606
}
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
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
1988
2611
}
1989
2612
}
1990
2613
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2616
1991
2617
/* Removes the GPGME temp directory and all files inside */
1992
if(tempdir_created){
2618
if(tempdir != NULL){
1993
2619
struct dirent **direntries = NULL;
1994
2620
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
alphasort);
2623
if(numentries > 0){
2624
for(int i = 0; i < numentries; i++){
1998
2625
direntry = direntries[i];
1999
2626
char *fullname = NULL;
2000
2627
ret = asprintf(&fullname, "%s/%s", tempdir,
2005
2632
}
2006
2633
ret = remove(fullname);
2007
2634
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
2010
2637
}
2011
2638
free(fullname);
2012
2639
}
2013
2640
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2641
2642
/* need to clean even if 0 because man page doesn't specify */
2017
2643
free(direntries);
2018
if (ret == -1){
2644
if(numentries == -1){
2019
2645
perror_plus("scandir");
2020
2646
}
2021
2647
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0