To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 487
- compare with another revision
- download diff
- download tarball
- view history from revision 487
- Committer: Teddy Hogeborn
- Date: 2011-07-16 00:29:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20110716002919-r77yikuiulj42o40
* initramfs-tools-script: Abort if plugin-runner is missing. Removed
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
- files removed:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.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 /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
86
85
raise() */
87
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
88
99
89
#ifdef __linux__
100
90
#include <sys/klog.h> /* klogctl() */
118
108
init_gnutls_session(),
119
109
GNUTLS_* */
120
110
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
123
113
124
114
/* GPGME */
125
115
#include <gpgme.h> /* All GPGME types, constants and
133
123
#define PATHDIR "/conf/conf.d/mandos"
134
124
#define SECKEY "seckey.txt"
135
125
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
126
138
127
bool debug = false;
139
128
static const char mandos_protocol_version[] = "1";
140
129
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
142
131
static const char sys_class_net[] = "/sys/class/net";
143
132
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
133
149
134
/* Doubly linked list that need to be circularly linked when used */
150
135
typedef struct server{
151
136
const char *ip;
152
in_port_t port;
137
uint16_t port;
153
138
AvahiIfIndex if_index;
154
139
int af;
155
140
struct timespec last_seen;
159
144
160
145
/* Used for passing in values through the Avahi callback functions */
161
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
162
148
AvahiServer *server;
163
149
gnutls_certificate_credentials_t cred;
164
150
unsigned int dh_bits;
166
152
const char *priority;
167
153
gpgme_ctx_t ctx;
168
154
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
155
} mandos_context;
172
156
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
162
176
163
sig_atomic_t quit_now = 0;
177
164
int signal_received = 0;
178
165
179
166
/* Function to use when printing errors */
180
167
void perror_plus(const char *print_text){
181
int e = errno;
182
168
fprintf(stderr, "Mandos plugin %s: ",
183
169
program_invocation_short_name);
184
errno = e;
185
170
perror(print_text);
186
171
}
187
172
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
173
/*
199
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
175
* bytes. "buffer_capacity" is how much is currently allocated,
201
176
* "buffer_length" is how much is already used.
202
177
*/
203
__attribute__((nonnull, warn_unused_result))
204
178
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
179
size_t buffer_capacity){
206
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
213
183
return 0;
214
184
}
215
*buffer = new_buf;
216
185
buffer_capacity += BUFFER_SIZE;
217
186
}
218
187
return buffer_capacity;
219
188
}
220
189
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){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
225
193
int ret;
226
194
server *new_server = malloc(sizeof(server));
227
195
if(new_server == NULL){
228
196
perror_plus("malloc");
229
return false;
197
return -1;
230
198
}
231
199
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
235
203
if(new_server->ip == NULL){
236
204
perror_plus("strdup");
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
/* Special case of first server */
245
if(*current_server == NULL){
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
246
209
new_server->next = new_server;
247
210
new_server->prev = new_server;
248
*current_server = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
249
213
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
253
216
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
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
225
}
258
226
259
227
/*
260
228
* Initialize GPGME.
261
229
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
267
232
gpgme_error_t rc;
268
233
gpgme_engine_info_t engine_info;
269
234
235
270
236
/*
271
237
* Helper function to insert pub and seckey to the engine keyring.
272
238
*/
273
bool import_key(const char * const filename){
239
bool import_key(const char *filename){
274
240
int ret;
275
241
int fd;
276
242
gpgme_data_t pgp_data;
283
249
284
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
251
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
288
254
return false;
289
255
}
290
256
291
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
292
258
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
295
261
return false;
296
262
}
297
263
304
270
}
305
271
306
272
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
308
274
}
309
275
310
276
/* Init GPGME */
311
277
gpgme_check_version(NULL);
312
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
279
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
316
282
return false;
317
283
}
318
284
319
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
320
286
rc = gpgme_get_engine_info(&engine_info);
321
287
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
324
290
return false;
325
291
}
326
292
while(engine_info != NULL){
332
298
engine_info = engine_info->next;
333
299
}
334
300
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
337
302
return false;
338
303
}
339
304
340
305
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
342
307
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
346
310
return false;
347
311
}
348
312
357
321
* Decrypt OpenPGP data.
358
322
* Returns -1 on error
359
323
*/
360
__attribute__((nonnull, warn_unused_result))
361
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
325
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
326
char **plaintext){
365
327
gpgme_data_t dh_crypto, dh_plain;
366
328
gpgme_error_t rc;
367
329
ssize_t ret;
369
331
ssize_t plaintext_length = 0;
370
332
371
333
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
373
335
}
374
336
375
337
/* Create new GPGME data buffer from memory cryptotext */
376
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
339
0);
378
340
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
381
343
return -1;
382
344
}
383
345
384
346
/* Create new empty GPGME data buffer for the plaintext */
385
347
rc = gpgme_data_new(&dh_plain);
386
348
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
390
351
gpgme_data_release(dh_crypto);
391
352
return -1;
392
353
}
393
354
394
355
/* Decrypt data from the cryptotext data buffer to the plaintext
395
356
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
358
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
400
361
plaintext_length = -1;
401
362
if(debug){
402
363
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
404
365
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
406
367
} else {
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
411
372
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
413
374
}
414
375
gpgme_recipient_t recipient;
415
376
recipient = result->recipients;
416
377
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
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");
424
384
recipient = recipient->next;
425
385
}
426
386
}
429
389
}
430
390
431
391
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
433
393
}
434
394
435
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
442
402
*plaintext = NULL;
443
403
while(true){
444
404
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
447
407
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
451
411
}
452
412
453
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
466
426
}
467
427
468
428
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
470
430
for(ssize_t i = 0; i < plaintext_length; i++){
471
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
432
}
483
443
return plaintext_length;
484
444
}
485
445
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
489
449
if(ret == NULL)
490
450
ret = "(unknown)";
491
451
return ret;
492
452
}
493
453
494
454
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
455
static void debuggnutls(__attribute__((unused)) int level,
497
456
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
499
458
}
500
459
501
__attribute__((nonnull, warn_unused_result))
502
460
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
461
const char *seckeyfilename){
505
462
int ret;
506
463
507
464
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
509
466
}
510
467
511
468
ret = gnutls_global_init();
512
469
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
515
472
return -1;
516
473
}
517
474
524
481
}
525
482
526
483
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
485
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
531
488
gnutls_global_deinit();
532
489
return -1;
533
490
}
534
491
535
492
if(debug){
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
540
496
}
541
497
542
498
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
544
500
GNUTLS_OPENPGP_FMT_BASE64);
545
501
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
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));
551
507
goto globalfail;
552
508
}
553
509
554
510
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
556
512
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
560
515
goto globalfail;
561
516
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
518
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
566
521
goto globalfail;
567
522
}
568
523
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
525
571
526
return 0;
572
527
573
528
globalfail:
574
529
575
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
576
531
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
578
533
return -1;
579
534
}
580
535
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
584
537
int ret;
585
538
/* GnuTLS session creation */
586
539
do {
590
543
}
591
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
545
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
596
548
}
597
549
598
550
{
599
551
const char *err;
600
552
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
554
if(quit_now){
603
555
gnutls_deinit(*session);
604
556
return -1;
605
557
}
606
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
559
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
611
563
gnutls_deinit(*session);
612
564
return -1;
613
565
}
615
567
616
568
do {
617
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
570
mc.cred);
619
571
if(quit_now){
620
572
gnutls_deinit(*session);
621
573
return -1;
622
574
}
623
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
576
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
627
579
gnutls_deinit(*session);
628
580
return -1;
629
581
}
631
583
/* ignore client certificate if any. */
632
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
585
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
587
636
588
return 0;
637
589
}
641
593
__attribute__((unused)) const char *txt){}
642
594
643
595
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
646
597
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
598
int af){
648
599
int ret, tcp_sd = -1;
649
600
ssize_t sret;
650
struct sockaddr_storage to;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
651
605
char *buffer = NULL;
652
606
char *decrypted_buffer = NULL;
653
607
size_t buffer_length = 0;
672
626
pf = PF_INET;
673
627
break;
674
628
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
676
630
errno = EINVAL;
677
631
return -1;
678
632
}
679
633
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
713
635
if(ret != 0){
714
636
return -1;
715
637
}
716
638
717
639
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
720
642
}
721
643
722
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
734
656
735
657
memset(&to, 0, sizeof(to));
736
658
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
661
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
742
664
}
743
665
if(ret < 0 ){
744
666
int e = errno;
748
670
}
749
671
if(ret == 0){
750
672
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
752
674
errno = e;
753
675
goto mandos_end;
754
676
}
755
677
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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
685
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
762
688
errno = EINVAL;
763
689
goto mandos_end;
764
690
}
765
691
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
692
to.in6.sin6_scope_id = (uint32_t)if_index;
767
693
}
768
694
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
770
698
}
771
699
772
700
if(quit_now){
780
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
709
perror_plus("if_indextoname");
782
710
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
785
713
}
786
714
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
789
717
}
790
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
792
721
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
797
724
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
802
727
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
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
}
809
734
}
810
735
}
811
736
815
740
}
816
741
817
742
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
744
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
746
}
824
747
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
749
int e = errno;
827
750
perror_plus("connect");
828
751
errno = e;
840
763
while(true){
841
764
size_t out_size = strlen(out);
842
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
766
out_size - written));
844
767
if(ret == -1){
845
768
int e = errno;
846
769
perror_plus("write");
866
789
}
867
790
868
791
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
870
793
}
871
794
872
795
if(quit_now){
874
797
goto mandos_end;
875
798
}
876
799
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
802
883
803
if(quit_now){
884
804
errno = EINTR;
895
815
896
816
if(ret != GNUTLS_E_SUCCESS){
897
817
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
899
819
gnutls_perror(ret);
900
820
}
901
821
errno = EPROTO;
905
825
/* Read OpenPGP packet that contains the wanted password */
906
826
907
827
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
910
830
}
911
831
912
832
while(true){
917
837
}
918
838
919
839
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
840
buffer_capacity);
921
841
if(buffer_capacity == 0){
922
842
int e = errno;
923
843
perror_plus("incbuffer");
950
870
}
951
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
872
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
955
874
gnutls_perror(ret);
956
875
errno = EPROTO;
957
876
goto mandos_end;
958
877
}
959
878
break;
960
879
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
963
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
883
errno = EIO;
965
884
goto mandos_end;
970
889
}
971
890
972
891
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
974
893
}
975
894
976
895
if(quit_now){
988
907
989
908
if(buffer_length > 0){
990
909
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
993
913
if(decrypted_buffer_size >= 0){
994
914
995
915
written = 0;
1005
925
if(ret == 0 and ferror(stdout)){
1006
926
int e = errno;
1007
927
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1010
930
}
1011
931
errno = e;
1012
932
goto mandos_end;
1043
963
return retval;
1044
964
}
1045
965
1046
__attribute__((nonnull))
1047
966
static void resolve_callback(AvahiSServiceResolver *r,
1048
967
AvahiIfIndex interface,
1049
968
AvahiProtocol proto,
1057
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
978
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1064
981
1065
982
/* Called whenever a service has been resolved successfully or
1066
983
timed out */
1072
989
switch(event){
1073
990
default:
1074
991
case AVAHI_RESOLVER_FAILURE:
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
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)));
1080
995
break;
1081
996
1082
997
case AVAHI_RESOLVER_FOUND:
1084
999
char ip[AVAHI_ADDRESS_STR_MAX];
1085
1000
avahi_address_snprint(ip, sizeof(ip), address);
1086
1001
if(debug){
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
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
1005
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1095
1008
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1097
1010
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1104
1013
}
1105
1014
}
1106
1015
}
1116
1025
const char *domain,
1117
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1027
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1123
1030
1124
1031
/* Called whenever a new services becomes available on the LAN or
1125
1032
is removed from the LAN */
1132
1039
default:
1133
1040
case AVAHI_BROWSER_FAILURE:
1134
1041
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1139
1045
return;
1140
1046
1141
1047
case AVAHI_BROWSER_NEW:
1144
1050
the callback function is called the Avahi server will free the
1145
1051
resolver for us. */
1146
1052
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
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)));
1155
1058
break;
1156
1059
1157
1060
case AVAHI_BROWSER_REMOVE:
1160
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
1065
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1165
1067
}
1166
1068
break;
1167
1069
}
1176
1078
signal_received = sig;
1177
1079
int old_errno = errno;
1178
1080
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1181
1083
}
1182
1084
errno = old_errno;
1183
1085
}
1184
1086
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
int ret;
1188
error_t ret_errno;
1189
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
if(s < 0){
1192
ret_errno = errno;
1193
perror_plus("socket");
1194
errno = ret_errno;
1195
return false;
1196
}
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
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){
1200
1143
if(debug){
1201
ret_errno = errno;
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1204
1146
}
1205
return false;
1147
free(flagstring);
1148
return 0;
1206
1149
}
1207
return true;
1208
}
1209
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1213
1152
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1215
1154
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1218
1157
}
1219
return false;
1158
return 0;
1220
1159
}
1221
1160
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1223
1162
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1226
1165
}
1227
return true;
1166
return 1;
1228
1167
}
1229
1168
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1231
1170
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1234
1173
}
1235
return false;
1174
return 0;
1236
1175
}
1237
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1239
1178
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1242
1181
}
1243
return false;
1182
return 0;
1244
1183
}
1245
1246
1184
/* Accept this device */
1247
1185
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1249
}
1250
return true;
1251
}
1252
1253
/*
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1261
return 0;
1262
}
1263
1264
struct ifreq ifr;
1265
if(not get_flags(if_entry->d_name, &ifr)){
1266
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1275
1188
}
1276
1189
return 1;
1277
1190
}
1278
1191
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
1192
int notdotentries(const struct dirent *direntry){
1315
1193
/* Skip "." and ".." */
1316
1194
if(direntry->d_name[0] == '.'
1322
1200
return 1;
1323
1201
}
1324
1202
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1328
int ret;
1329
size_t sret;
1330
struct stat st;
1331
1332
if((direntry->d_name)[0] == '\0'){
1333
/* Empty name? */
1334
return 0;
1335
}
1336
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1339
"0123456789"
1340
"_.-");
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1351
if(ret == -1){
1352
if(debug){
1353
perror_plus("Could not stat hook");
1354
}
1355
return 0;
1356
}
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1363
return 0;
1364
}
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1371
return 0;
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
return 1;
1378
}
1379
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1204
int ret;
1384
1205
struct timespec now;
1385
1206
struct timespec waited_time;
1386
1207
intmax_t block_time;
1387
1208
1388
1209
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1393
1214
}
1394
1215
ret = avahi_simple_poll_iterate(s, -1);
1395
1216
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1399
1220
}
1400
1221
/* the current time */
1401
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1406
1227
/* Calculating in ms how long time between now and server
1407
1228
who we visted longest time ago. Now - last seen. */
1408
1229
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1410
1231
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1412
1233
/* total time is 10s/10,000ms.
1413
1234
Converting to s from ms by dividing by 1,000,
1414
1235
and ns to ms by dividing by 1,000,000. */
1415
1236
block_time = ((retry_interval
1416
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1422
1242
}
1423
1243
1424
1244
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
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);
1429
1249
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1431
1251
return 0;
1432
1252
}
1433
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1435
1255
if(ret == -1){
1436
1256
perror_plus("clock_gettime");
1437
1257
return -1;
1438
1258
}
1439
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1440
1260
block_time = 0; /* Call avahi to find new Mandos
1441
1261
servers, but don't block */
1442
1262
}
1444
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1265
}
1446
1266
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1448
1268
return (ret != 1) ? ret : 0;
1449
1269
}
1450
1270
}
1451
1271
}
1452
1272
}
1453
1273
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1508
const float delay){
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1536
if(numhooks == -1){
1537
perror_plus("scandir");
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1548
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1610
perror_plus("asprintf");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1615
free(delaystring);
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1659
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
1683
int ret;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
1692
if(quit_now){
1693
errno = old_errno;
1694
return EINTR;
1695
}
1696
1697
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
return ret_errno;
1705
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1707
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1710
ret_errno = errno;
1711
perror_plus("socket");
1712
errno = old_errno;
1713
return ret_errno;
1714
}
1715
1716
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(debug){
1726
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1727
interface);
1728
}
1729
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1736
1737
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1749
}
1750
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1753
#ifdef __linux__
1754
if(restore_loglevel){
1755
ret_linux = klogctl(7, NULL, 0);
1756
if(ret_linux == -1){
1757
perror_plus("klogctl");
1758
}
1759
}
1760
#endif /* __linux__ */
1761
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
errno = old_errno;
1782
return ioctl_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1786
interface);
1787
}
1788
1789
/* Sleep checking until interface is running.
1790
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
1792
if(interface_is_running(interface)){
1793
break;
1794
}
1795
struct timespec sleeptime = { .tv_nsec = 250000000 };
1796
ret = nanosleep(&sleeptime, NULL);
1797
if(ret == -1 and errno != EINTR){
1798
perror_plus("nanosleep");
1799
}
1800
}
1801
1802
errno = old_errno;
1803
return 0;
1804
}
1805
1806
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
1809
struct ifreq network;
1810
unsigned int if_index = if_nametoindex(interface);
1811
if(if_index == 0){
1812
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1813
errno = old_errno;
1814
return ENXIO;
1815
}
1816
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
if(not get_flags(interface, &network) and debug){
1819
ret_errno = errno;
1820
fprintf_plus(stderr, "Failed to get flags for interface "
1821
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
return ret_errno;
1824
}
1825
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1829
ret_errno = errno;
1830
perror_plus("socket");
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
1835
if(debug){
1836
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1837
interface);
1838
}
1839
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1879
}
1880
1881
1274
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1886
1275
AvahiSServiceBrowser *sb = NULL;
1887
error_t ret_errno;
1276
int error;
1888
1277
int ret;
1889
1278
intmax_t tmpmax;
1890
1279
char *tmp;
1891
1280
int exitcode = EXIT_SUCCESS;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
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;
1897
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
1290
const char *seckey = PATHDIR "/" SECKEY;
1899
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1901
1292
1902
1293
bool gnutls_initialized = false;
1903
1294
bool gpgme_initialized = false;
1965
1356
.group = 2 },
1966
1357
{ .name = "retry", .key = 132,
1967
1358
.arg = "SECONDS",
1968
.doc = "Retry interval used when denied by the Mandos server",
1969
.group = 2 },
1970
{ .name = "network-hook-dir", .key = 133,
1971
.arg = "DIR",
1972
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
1973
1360
.group = 2 },
1974
1361
/*
1975
1362
* These reproduce what we would get without ARGP_NO_HELP
1994
1381
connect_to = arg;
1995
1382
break;
1996
1383
case 'i': /* --interface */
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
1384
interface = arg;
2002
1385
break;
2003
1386
case 's': /* --seckey */
2004
1387
seckey = arg;
2028
1411
errno = 0;
2029
1412
retry_interval = strtod(arg, &tmp);
2030
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
2031
or (retry_interval * 1000) > INT_MAX
2032
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
2033
1415
argp_error(state, "Bad retry interval");
2034
1416
}
2035
1417
break;
2036
case 133: /* --network-hook-dir */
2037
hookdir = arg;
2038
break;
2039
1418
/*
2040
1419
* These reproduce what we would get without ARGP_NO_HELP
2041
1420
*/
2047
1426
argp_state_help(state, state->out_stream,
2048
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2049
1428
case 'V': /* --version */
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2051
1430
exit(argp_err_exit_status);
2052
1431
break;
2053
1432
default:
2080
1459
{
2081
1460
/* Work around Debian bug #633582:
2082
1461
<http://bugs.debian.org/633582> */
2083
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
2089
} else {
2090
struct stat st;
2091
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2110
}
2111
}
2112
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
2156
}
2157
}
2158
}
2159
2160
/* Run network hooks */
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
2166
goto end;
2167
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
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
}
2173
1513
}
2174
1514
2175
1515
if(not debug){
2176
1516
avahi_set_log_function(empty_log);
2177
1517
}
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
}
2178
1543
2179
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2180
1545
from the signal handler */
2181
1546
/* Initialize the pseudo-RNG for Avahi */
2182
1547
srand((unsigned int) time(NULL));
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
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");
2187
1551
exitcode = EX_UNAVAILABLE;
2188
1552
goto end;
2189
1553
}
2251
1615
}
2252
1616
}
2253
1617
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
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");
1703
}
1704
}
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
break;
1723
}
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
}
2276
1754
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2280
fprintf_plus(stderr, "Could not find a network interface\n");
2281
exitcode = EXIT_FAILURE;
2282
goto end;
2283
}
2284
}
2285
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2288
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2290
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
2303
}
2304
}
2305
break;
2306
}
2307
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2309
if(not interface_was_up){
2310
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2312
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2319
}
2320
}
2321
}
2322
if(debug and (interfaces_to_take_down == NULL)){
2323
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
}
2325
}
2326
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2334
1761
}
2335
1762
2336
1763
if(quit_now){
2337
1764
goto end;
2338
1765
}
2339
1766
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2341
1768
if(ret == -1){
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2343
1770
exitcode = EX_UNAVAILABLE;
2344
1771
goto end;
2345
1772
} else {
2350
1777
goto end;
2351
1778
}
2352
1779
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
1780
if(mkdtemp(tempdir) == NULL){
2363
1781
perror_plus("mkdtemp");
2364
1782
goto end;
2365
1783
}
1784
tempdir_created = true;
2366
1785
2367
1786
if(quit_now){
2368
1787
goto end;
2369
1788
}
2370
1789
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2372
fprintf_plus(stderr, "init_gpgme failed\n");
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2373
1792
exitcode = EX_UNAVAILABLE;
2374
1793
goto end;
2375
1794
} else {
2384
1803
/* Connect directly, do not use Zeroconf */
2385
1804
/* (Mainly meant for debugging) */
2386
1805
char *address = strrchr(connect_to, ':');
2387
2388
1806
if(address == NULL){
2389
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2390
1808
exitcode = EX_USAGE;
2391
1809
goto end;
2392
1810
}
2395
1813
goto end;
2396
1814
}
2397
1815
2398
in_port_t port;
1816
uint16_t port;
2399
1817
errno = 0;
2400
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2401
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2402
or tmpmax != (in_port_t)tmpmax){
2403
fprintf_plus(stderr, "Bad port number\n");
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2404
1822
exitcode = EX_USAGE;
2405
1823
goto end;
2406
1824
}
2407
1825
2408
1826
if(quit_now){
2409
1827
goto end;
2410
1828
}
2411
1829
2412
port = (in_port_t)tmpmax;
1830
port = (uint16_t)tmpmax;
2413
1831
*address = '\0';
1832
address = connect_to;
2414
1833
/* Colon in address indicates IPv6 */
2415
1834
int af;
2416
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2417
1836
af = AF_INET6;
2418
/* Accept [] around IPv6 address - see RFC 5952 */
2419
if(connect_to[0] == '[' and address[-1] == ']')
2420
{
2421
connect_to++;
2422
address[-1] = '\0';
2423
}
2424
1837
} else {
2425
1838
af = AF_INET;
2426
1839
}
2427
address = connect_to;
2428
1840
2429
1841
if(quit_now){
2430
1842
goto end;
2431
1843
}
2432
1844
2433
1845
while(not quit_now){
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
1846
ret = start_mandos_communication(address, port, if_index, af);
2436
1847
if(quit_now or ret == 0){
2437
1848
break;
2438
1849
}
2439
if(debug){
2440
fprintf_plus(stderr, "Retrying in %d seconds\n",
2441
(int)retry_interval);
2442
}
2443
sleep((unsigned int)retry_interval);
2444
}
2445
2446
if(not quit_now){
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
2447
1854
exitcode = EXIT_SUCCESS;
2448
1855
}
2449
1856
2450
1857
goto end;
2451
1858
}
2452
1859
2464
1871
config.publish_domain = 0;
2465
1872
2466
1873
/* Allocate a new server */
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2469
1877
2470
1878
/* Free the Avahi configuration data */
2471
1879
avahi_server_config_free(&config);
2473
1881
2474
1882
/* Check if creating the Avahi server object succeeded */
2475
1883
if(mc.server == NULL){
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2478
1886
exitcode = EX_UNAVAILABLE;
2479
1887
goto end;
2480
1888
}
2486
1894
/* Create the Avahi service browser */
2487
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
2488
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
1897
NULL, 0, browse_callback, NULL);
2491
1898
if(sb == NULL){
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2493
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2494
1901
exitcode = EX_UNAVAILABLE;
2495
1902
goto end;
2496
1903
}
2502
1909
/* Run the main loop */
2503
1910
2504
1911
if(debug){
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2506
1913
}
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2510
1917
if(debug){
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2512
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2513
1920
}
2514
1921
2515
1922
end:
2516
1923
2517
1924
if(debug){
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2519
1926
}
2520
1927
2521
1928
/* Cleanup things */
2522
free(mc.interfaces);
2523
2524
1929
if(sb != NULL)
2525
1930
avahi_s_service_browser_free(sb);
2526
1931
2527
1932
if(mc.server != NULL)
2528
1933
avahi_server_free(mc.server);
2529
1934
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2532
1937
2533
1938
if(gnutls_initialized){
2534
1939
gnutls_certificate_free_credentials(mc.cred);
2539
1944
if(gpgme_initialized){
2540
1945
gpgme_release(mc.ctx);
2541
1946
}
2542
1947
2543
1948
/* Cleans up the circular linked list of Mandos servers the client
2544
1949
has seen */
2545
1950
if(mc.current_server != NULL){
2551
1956
}
2552
1957
}
2553
1958
2554
/* Re-raise privileges */
2555
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
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");
2583
1966
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
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
}
2589
1988
}
2590
1989
}
2591
1990
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2594
2595
1991
/* Removes the GPGME temp directory and all files inside */
2596
if(tempdir != NULL){
1992
if(tempdir_created){
2597
1993
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
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);
2634
2012
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
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");
2636
2024
}
2637
2025
}
2638
2026
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0