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- Committer: Teddy Hogeborn
- Date: 2014-06-13 22:13:56 UTC
- Revision ID: teddy@recompile.se-20140613221356-b9c36ctxmw4pelja
Fix free() of possibly uninitialized pointer in mandos-client.
* plugins.d/mandos-client (main): Initialize "direntries" to NULL so
it can be free()'d even if scandir()
fails.
* plugins.d/mandos-client (main): Initialize "direntries" to NULL so
it can be free()'d even if scandir()
fails.
- files added:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
82
84
#include <signal.h> /* sigemptyset(), sigaddset(),
83
85
sigaction(), SIGTERM, sig_atomic_t,
84
86
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
86
98
87
99
#ifdef __linux__
88
100
#include <sys/klog.h> /* klogctl() */
106
118
init_gnutls_session(),
107
119
GNUTLS_* */
108
120
#include <gnutls/openpgp.h>
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
111
123
112
124
/* GPGME */
113
125
#include <gpgme.h> /* All GPGME types, constants and
121
133
#define PATHDIR "/conf/conf.d/mandos"
122
134
#define SECKEY "seckey.txt"
123
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
137
125
138
bool debug = false;
126
139
static const char mandos_protocol_version[] = "1";
127
140
const char *argp_program_version = "mandos-client " VERSION;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
129
159
130
160
/* Used for passing in values through the Avahi callback functions */
131
161
typedef struct {
132
AvahiSimplePoll *simple_poll;
133
162
AvahiServer *server;
134
163
gnutls_certificate_credentials_t cred;
135
164
unsigned int dh_bits;
136
165
gnutls_dh_params_t dh_params;
137
166
const char *priority;
138
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
139
171
} mandos_context;
140
172
141
/* global context so signal handler can reach it*/
142
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
145
175
146
176
sig_atomic_t quit_now = 0;
147
177
int signal_received = 0;
148
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
149
198
/*
150
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
151
200
* bytes. "buffer_capacity" is how much is currently allocated,
152
201
* "buffer_length" is how much is already used.
153
202
*/
203
__attribute__((nonnull, warn_unused_result))
154
204
size_t incbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
205
size_t buffer_capacity){
156
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
159
213
return 0;
160
214
}
215
*buffer = new_buf;
161
216
buffer_capacity += BUFFER_SIZE;
162
217
}
163
218
return buffer_capacity;
164
219
}
165
220
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){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
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){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
249
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
257
}
258
166
259
/*
167
260
* Initialize GPGME.
168
261
*/
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
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){
171
267
gpgme_error_t rc;
172
268
gpgme_engine_info_t engine_info;
173
269
174
175
270
/*
176
271
* Helper function to insert pub and seckey to the engine keyring.
177
272
*/
178
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
179
274
int ret;
180
275
int fd;
181
276
gpgme_data_t pgp_data;
182
277
183
278
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
184
279
if(fd == -1){
185
perror("open");
280
perror_plus("open");
186
281
return false;
187
282
}
188
283
189
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
190
285
if(rc != GPG_ERR_NO_ERROR){
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
193
288
return false;
194
289
}
195
290
196
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
197
292
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
200
295
return false;
201
296
}
202
297
203
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
204
299
if(ret == -1){
205
perror("close");
300
perror_plus("close");
206
301
}
207
302
gpgme_data_release(pgp_data);
208
303
return true;
209
304
}
210
305
211
306
if(debug){
212
fprintf(stderr, "Initializing GPGME\n");
307
fprintf_plus(stderr, "Initializing GPGME\n");
213
308
}
214
309
215
310
/* Init GPGME */
216
311
gpgme_check_version(NULL);
217
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
218
313
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
221
316
return false;
222
317
}
223
318
224
/* Set GPGME home directory for the OpenPGP engine only */
319
/* Set GPGME home directory for the OpenPGP engine only */
225
320
rc = gpgme_get_engine_info(&engine_info);
226
321
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
229
324
return false;
230
325
}
231
326
while(engine_info != NULL){
237
332
engine_info = engine_info->next;
238
333
}
239
334
if(engine_info == NULL){
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
241
337
return false;
242
338
}
243
339
244
340
/* Create new GPGME "context" */
245
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
246
342
if(rc != GPG_ERR_NO_ERROR){
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
249
346
return false;
250
347
}
251
348
260
357
* Decrypt OpenPGP data.
261
358
* Returns -1 on error
262
359
*/
360
__attribute__((nonnull, warn_unused_result))
263
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
264
362
size_t crypto_size,
265
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
266
365
gpgme_data_t dh_crypto, dh_plain;
267
366
gpgme_error_t rc;
268
367
ssize_t ret;
270
369
ssize_t plaintext_length = 0;
271
370
272
371
if(debug){
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
373
}
275
374
276
375
/* Create new GPGME data buffer from memory cryptotext */
277
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
278
377
0);
279
378
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
282
381
return -1;
283
382
}
284
383
285
384
/* Create new empty GPGME data buffer for the plaintext */
286
385
rc = gpgme_data_new(&dh_plain);
287
386
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
290
390
gpgme_data_release(dh_crypto);
291
391
return -1;
292
392
}
293
393
294
394
/* Decrypt data from the cryptotext data buffer to the plaintext
295
395
data buffer */
296
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
397
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
300
400
plaintext_length = -1;
301
401
if(debug){
302
402
gpgme_decrypt_result_t result;
303
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
304
404
if(result == NULL){
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
406
} else {
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
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);
311
411
if(result->file_name != NULL){
312
fprintf(stderr, "File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
413
}
314
414
gpgme_recipient_t recipient;
315
415
recipient = result->recipients;
316
416
while(recipient != NULL){
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
322
? "No" : "Yes");
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");
323
424
recipient = recipient->next;
324
425
}
325
426
}
328
429
}
329
430
330
431
if(debug){
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
433
}
333
434
334
435
/* Seek back to the beginning of the GPGME plaintext data buffer */
335
436
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
336
perror("gpgme_data_seek");
437
perror_plus("gpgme_data_seek");
337
438
plaintext_length = -1;
338
439
goto decrypt_end;
339
440
}
341
442
*plaintext = NULL;
342
443
while(true){
343
444
plaintext_capacity = incbuffer(plaintext,
344
(size_t)plaintext_length,
345
plaintext_capacity);
445
(size_t)plaintext_length,
446
plaintext_capacity);
346
447
if(plaintext_capacity == 0){
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
350
451
}
351
452
352
453
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
357
458
break;
358
459
}
359
460
if(ret < 0){
360
perror("gpgme_data_read");
461
perror_plus("gpgme_data_read");
361
462
plaintext_length = -1;
362
463
goto decrypt_end;
363
464
}
365
466
}
366
467
367
468
if(debug){
368
fprintf(stderr, "Decrypted password is: ");
469
fprintf_plus(stderr, "Decrypted password is: ");
369
470
for(ssize_t i = 0; i < plaintext_length; i++){
370
471
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
371
472
}
382
483
return plaintext_length;
383
484
}
384
485
385
static const char * safer_gnutls_strerror(int value){
386
const char *ret = gnutls_strerror(value); /* Spurious warning from
387
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
388
489
if(ret == NULL)
389
490
ret = "(unknown)";
390
491
return ret;
391
492
}
392
493
393
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
394
496
static void debuggnutls(__attribute__((unused)) int level,
395
497
const char* string){
396
fprintf(stderr, "GnuTLS: %s", string);
498
fprintf_plus(stderr, "GnuTLS: %s", string);
397
499
}
398
500
501
__attribute__((nonnull, warn_unused_result))
399
502
static int init_gnutls_global(const char *pubkeyfilename,
400
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
401
505
int ret;
402
506
403
507
if(debug){
404
fprintf(stderr, "Initializing GnuTLS\n");
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
509
}
406
510
407
511
ret = gnutls_global_init();
408
512
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
411
515
return -1;
412
516
}
413
517
420
524
}
421
525
422
526
/* OpenPGP credentials */
423
gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
424
528
if(ret != GNUTLS_E_SUCCESS){
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
430
531
gnutls_global_deinit();
431
532
return -1;
432
533
}
433
534
434
535
if(debug){
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
438
540
}
439
541
440
542
ret = gnutls_certificate_set_openpgp_key_file
441
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
442
544
GNUTLS_OPENPGP_FMT_BASE64);
443
545
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr,
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
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));
449
551
goto globalfail;
450
552
}
451
553
452
554
/* GnuTLS server initialization */
453
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
454
556
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
457
560
goto globalfail;
458
561
}
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
460
563
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
463
566
goto globalfail;
464
567
}
465
568
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
467
570
468
571
return 0;
469
572
470
573
globalfail:
471
574
472
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
473
576
gnutls_global_deinit();
474
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
475
578
return -1;
476
579
}
477
580
478
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
479
584
int ret;
480
585
/* GnuTLS session creation */
481
586
do {
485
590
}
486
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
592
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
490
596
}
491
597
492
598
{
493
599
const char *err;
494
600
do {
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
496
602
if(quit_now){
497
603
gnutls_deinit(*session);
498
604
return -1;
499
605
}
500
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
501
607
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
505
611
gnutls_deinit(*session);
506
612
return -1;
507
613
}
509
615
510
616
do {
511
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
512
mc.cred);
618
mc->cred);
513
619
if(quit_now){
514
620
gnutls_deinit(*session);
515
621
return -1;
516
622
}
517
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
518
624
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
521
627
gnutls_deinit(*session);
522
628
return -1;
523
629
}
525
631
/* ignore client certificate if any. */
526
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
527
633
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
529
635
530
636
return 0;
531
637
}
535
641
__attribute__((unused)) const char *txt){}
536
642
537
643
/* Called when a Mandos server is found */
538
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
539
646
AvahiIfIndex if_index,
540
int af){
647
int af, mandos_context *mc){
541
648
int ret, tcp_sd = -1;
542
649
ssize_t sret;
543
union {
544
struct sockaddr_in in;
545
struct sockaddr_in6 in6;
546
} to;
650
struct sockaddr_storage to;
547
651
char *buffer = NULL;
548
652
char *decrypted_buffer = NULL;
549
653
size_t buffer_length = 0;
553
657
gnutls_session_t session;
554
658
int pf; /* Protocol family */
555
659
660
errno = 0;
661
556
662
if(quit_now){
663
errno = EINTR;
557
664
return -1;
558
665
}
559
666
565
672
pf = PF_INET;
566
673
break;
567
674
default:
568
fprintf(stderr, "Bad address family: %d\n", af);
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
676
errno = EINVAL;
569
677
return -1;
570
678
}
571
679
572
ret = init_gnutls_session(&session);
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);
573
713
if(ret != 0){
574
714
return -1;
575
715
}
576
716
577
717
if(debug){
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
580
720
}
581
721
582
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
583
723
if(tcp_sd < 0){
584
perror("socket");
724
int e = errno;
725
perror_plus("socket");
726
errno = e;
585
727
goto mandos_end;
586
728
}
587
729
588
730
if(quit_now){
731
errno = EINTR;
589
732
goto mandos_end;
590
733
}
591
734
592
735
memset(&to, 0, sizeof(to));
593
736
if(af == AF_INET6){
594
to.in6.sin6_family = (sa_family_t)af;
595
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
596
739
} else { /* IPv4 */
597
to.in.sin_family = (sa_family_t)af;
598
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
599
742
}
600
743
if(ret < 0 ){
601
perror("inet_pton");
744
int e = errno;
745
perror_plus("inet_pton");
746
errno = e;
602
747
goto mandos_end;
603
748
}
604
749
if(ret == 0){
605
fprintf(stderr, "Bad address: %s\n", ip);
750
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
752
errno = e;
606
753
goto mandos_end;
607
754
}
608
755
if(af == AF_INET6){
609
to.in6.sin6_port = htons(port); /* Spurious warnings from
610
-Wconversion and
611
-Wunreachable-code */
612
613
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
614
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
615
-Wunreachable-code*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
616
759
if(if_index == AVAHI_IF_UNSPEC){
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
762
errno = EINVAL;
619
763
goto mandos_end;
620
764
}
621
765
/* Set the network interface number as scope */
622
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
623
767
}
624
768
} else {
625
to.in.sin_port = htons(port); /* Spurious warnings from
626
-Wconversion and
627
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
628
770
}
629
771
630
772
if(quit_now){
773
errno = EINTR;
631
774
goto mandos_end;
632
775
}
633
776
635
778
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
636
779
char interface[IF_NAMESIZE];
637
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
638
perror("if_indextoname");
781
perror_plus("if_indextoname");
639
782
} else {
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
642
785
}
643
786
} else {
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
646
789
}
647
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
648
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
649
const char *pcret;
650
792
if(af == AF_INET6){
651
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
652
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
653
797
} else {
654
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
655
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
656
802
}
657
if(pcret == NULL){
658
perror("inet_ntop");
659
} else {
660
if(strcmp(addrstr, ip) != 0){
661
fprintf(stderr, "Canonical address form: %s\n", addrstr);
662
}
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);
663
809
}
664
810
}
665
811
666
812
if(quit_now){
813
errno = EINTR;
667
814
goto mandos_end;
668
815
}
669
816
670
817
if(af == AF_INET6){
671
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
672
820
} else {
673
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
674
823
}
675
824
if(ret < 0){
676
perror("connect");
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
677
830
goto mandos_end;
678
831
}
679
832
680
833
if(quit_now){
834
errno = EINTR;
681
835
goto mandos_end;
682
836
}
683
837
686
840
while(true){
687
841
size_t out_size = strlen(out);
688
842
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
689
out_size - written));
843
out_size - written));
690
844
if(ret == -1){
691
perror("write");
845
int e = errno;
846
perror_plus("write");
847
errno = e;
692
848
goto mandos_end;
693
849
}
694
850
written += (size_t)ret;
704
860
}
705
861
706
862
if(quit_now){
863
errno = EINTR;
707
864
goto mandos_end;
708
865
}
709
866
}
710
867
711
868
if(debug){
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
713
870
}
714
871
715
872
if(quit_now){
873
errno = EINTR;
716
874
goto mandos_end;
717
875
}
718
876
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
720
882
721
883
if(quit_now){
884
errno = EINTR;
722
885
goto mandos_end;
723
886
}
724
887
725
888
do {
726
889
ret = gnutls_handshake(session);
727
890
if(quit_now){
891
errno = EINTR;
728
892
goto mandos_end;
729
893
}
730
894
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
731
895
732
896
if(ret != GNUTLS_E_SUCCESS){
733
897
if(debug){
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
735
899
gnutls_perror(ret);
736
900
}
901
errno = EPROTO;
737
902
goto mandos_end;
738
903
}
739
904
740
905
/* Read OpenPGP packet that contains the wanted password */
741
906
742
907
if(debug){
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
745
910
}
746
911
747
912
while(true){
748
913
749
914
if(quit_now){
915
errno = EINTR;
750
916
goto mandos_end;
751
917
}
752
918
753
919
buffer_capacity = incbuffer(&buffer, buffer_length,
754
buffer_capacity);
920
buffer_capacity);
755
921
if(buffer_capacity == 0){
756
perror("incbuffer");
922
int e = errno;
923
perror_plus("incbuffer");
924
errno = e;
757
925
goto mandos_end;
758
926
}
759
927
760
928
if(quit_now){
929
errno = EINTR;
761
930
goto mandos_end;
762
931
}
763
932
776
945
ret = gnutls_handshake(session);
777
946
778
947
if(quit_now){
948
errno = EINTR;
779
949
goto mandos_end;
780
950
}
781
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
782
952
if(ret < 0){
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
784
955
gnutls_perror(ret);
956
errno = EPROTO;
785
957
goto mandos_end;
786
958
}
787
959
break;
788
960
default:
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
791
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
errno = EIO;
792
965
goto mandos_end;
793
966
}
794
967
} else {
797
970
}
798
971
799
972
if(debug){
800
fprintf(stderr, "Closing TLS session\n");
973
fprintf_plus(stderr, "Closing TLS session\n");
801
974
}
802
975
803
976
if(quit_now){
977
errno = EINTR;
804
978
goto mandos_end;
805
979
}
806
980
807
981
do {
808
982
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
983
if(quit_now){
984
errno = EINTR;
810
985
goto mandos_end;
811
986
}
812
987
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
988
814
989
if(buffer_length > 0){
815
990
ssize_t decrypted_buffer_size;
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
818
&decrypted_buffer);
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
819
993
if(decrypted_buffer_size >= 0){
820
994
821
995
written = 0;
822
996
while(written < (size_t) decrypted_buffer_size){
823
997
if(quit_now){
998
errno = EINTR;
824
999
goto mandos_end;
825
1000
}
826
1001
828
1003
(size_t)decrypted_buffer_size - written,
829
1004
stdout);
830
1005
if(ret == 0 and ferror(stdout)){
1006
int e = errno;
831
1007
if(debug){
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
834
1010
}
1011
errno = e;
835
1012
goto mandos_end;
836
1013
}
837
1014
written += (size_t)ret;
843
1020
/* Shutdown procedure */
844
1021
845
1022
mandos_end:
846
free(decrypted_buffer);
847
free(buffer);
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
851
if(ret == -1){
852
perror("close");
853
}
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
1023
{
1024
int e = errno;
1025
free(decrypted_buffer);
1026
free(buffer);
1027
if(tcp_sd >= 0){
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1029
}
1030
if(ret == -1){
1031
if(e == 0){
1032
e = errno;
1033
}
1034
perror_plus("close");
1035
}
1036
gnutls_deinit(session);
1037
errno = e;
1038
if(quit_now){
1039
errno = EINTR;
1040
retval = -1;
1041
}
857
1042
}
858
1043
return retval;
859
1044
}
860
1045
1046
__attribute__((nonnull))
861
1047
static void resolve_callback(AvahiSServiceResolver *r,
862
1048
AvahiIfIndex interface,
863
1049
AvahiProtocol proto,
871
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
872
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
873
1059
flags,
874
AVAHI_GCC_UNUSED void* userdata){
875
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
876
1064
877
1065
/* Called whenever a service has been resolved successfully or
878
1066
timed out */
884
1072
switch(event){
885
1073
default:
886
1074
case AVAHI_RESOLVER_FAILURE:
887
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
888
" of type '%s' in domain '%s': %s\n", name, type, domain,
889
avahi_strerror(avahi_server_errno(mc.server)));
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)));
890
1080
break;
891
1081
892
1082
case AVAHI_RESOLVER_FOUND:
894
1084
char ip[AVAHI_ADDRESS_STR_MAX];
895
1085
avahi_address_snprint(ip, sizeof(ip), address);
896
1086
if(debug){
897
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
898
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
899
ip, (intmax_t)interface, port);
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);
900
1090
}
901
int ret = start_mandos_communication(ip, port, interface,
902
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
903
1095
if(ret == 0){
904
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1097
} 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
}
905
1104
}
906
1105
}
907
1106
}
917
1116
const char *domain,
918
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
919
1118
flags,
920
AVAHI_GCC_UNUSED void* userdata){
921
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
922
1123
923
1124
/* Called whenever a new services becomes available on the LAN or
924
1125
is removed from the LAN */
931
1132
default:
932
1133
case AVAHI_BROWSER_FAILURE:
933
1134
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
936
avahi_simple_poll_quit(mc.simple_poll);
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);
937
1139
return;
938
1140
939
1141
case AVAHI_BROWSER_NEW:
942
1144
the callback function is called the Avahi server will free the
943
1145
resolver for us. */
944
1146
945
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
name, type, domain, protocol, 0,
947
resolve_callback, NULL) == NULL)
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
949
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
950
1155
break;
951
1156
952
1157
case AVAHI_BROWSER_REMOVE:
955
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
956
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
957
1162
if(debug){
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
959
1165
}
960
1166
break;
961
1167
}
962
1168
}
963
1169
964
/* stop main loop after sigterm has been called */
1170
/* Signal handler that stops main loop after SIGTERM */
965
1171
static void handle_sigterm(int sig){
966
1172
if(quit_now){
967
1173
return;
969
1175
quit_now = 1;
970
1176
signal_received = sig;
971
1177
int old_errno = errno;
972
if(mc.simple_poll != NULL){
973
avahi_simple_poll_quit(mc.simple_poll);
974
}
975
errno = old_errno;
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1181
}
1182
errno = old_errno;
1183
}
1184
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){
1200
if(debug){
1201
ret_errno = errno;
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
}
1205
return false;
1206
}
1207
return true;
1208
}
1209
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1218
}
1219
return false;
1220
}
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1226
}
1227
return true;
1228
}
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1234
}
1235
return false;
1236
}
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1239
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1242
}
1243
return false;
1244
}
1245
1246
/* Accept this device */
1247
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;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1320
return 0;
1321
}
1322
return 1;
1323
}
1324
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){
1383
int ret;
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1387
1388
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");
1393
}
1394
ret = avahi_simple_poll_iterate(s, -1);
1395
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1399
}
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1402
if(ret == -1){
1403
perror_plus("clock_gettime");
1404
return -1;
1405
}
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1422
}
1423
1424
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);
1429
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1431
return 0;
1432
}
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1435
if(ret == -1){
1436
perror_plus("clock_gettime");
1437
return -1;
1438
}
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1442
}
1443
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
}
1446
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1449
}
1450
}
1451
}
1452
}
1453
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1674
perror_plus("close");
1675
} else {
1676
hookdir_fd = -1;
1677
}
1678
close(devnull);
1679
}
1680
1681
__attribute__((nonnull, warn_unused_result))
1682
error_t bring_up_interface(const char *const interface,
1683
const float delay){
1684
error_t old_errno = errno;
1685
int ret;
1686
struct ifreq network;
1687
unsigned int if_index = if_nametoindex(interface);
1688
if(if_index == 0){
1689
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1690
errno = old_errno;
1691
return ENXIO;
1692
}
1693
1694
if(quit_now){
1695
errno = old_errno;
1696
return EINTR;
1697
}
1698
1699
if(not interface_is_up(interface)){
1700
error_t ret_errno = 0, ioctl_errno = 0;
1701
if(not get_flags(interface, &network)){
1702
ret_errno = errno;
1703
fprintf_plus(stderr, "Failed to get flags for interface "
1704
"\"%s\"\n", interface);
1705
errno = old_errno;
1706
return ret_errno;
1707
}
1708
network.ifr_flags |= IFF_UP; /* set flag */
1709
1710
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1711
if(sd == -1){
1712
ret_errno = errno;
1713
perror_plus("socket");
1714
errno = old_errno;
1715
return ret_errno;
1716
}
1717
1718
if(quit_now){
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1720
if(ret == -1){
1721
perror_plus("close");
1722
}
1723
errno = old_errno;
1724
return EINTR;
1725
}
1726
1727
if(debug){
1728
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1729
interface);
1730
}
1731
1732
/* Raise privileges */
1733
ret_errno = raise_privileges();
1734
if(ret_errno != 0){
1735
perror_plus("Failed to raise privileges");
1736
}
1737
1738
#ifdef __linux__
1739
int ret_linux;
1740
bool restore_loglevel = false;
1741
if(ret_errno == 0){
1742
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1743
messages about the network interface to mess up the prompt */
1744
ret_linux = klogctl(8, NULL, 5);
1745
if(ret_linux == -1){
1746
perror_plus("klogctl");
1747
} else {
1748
restore_loglevel = true;
1749
}
1750
}
1751
#endif /* __linux__ */
1752
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1753
ioctl_errno = errno;
1754
#ifdef __linux__
1755
if(restore_loglevel){
1756
ret_linux = klogctl(7, NULL, 0);
1757
if(ret_linux == -1){
1758
perror_plus("klogctl");
1759
}
1760
}
1761
#endif /* __linux__ */
1762
1763
/* If raise_privileges() succeeded above */
1764
if(ret_errno == 0){
1765
/* Lower privileges */
1766
ret_errno = lower_privileges();
1767
if(ret_errno != 0){
1768
errno = ret_errno;
1769
perror_plus("Failed to lower privileges");
1770
}
1771
}
1772
1773
/* Close the socket */
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ioctl_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1782
errno = old_errno;
1783
return ioctl_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1787
interface);
1788
}
1789
1790
/* Sleep checking until interface is running.
1791
Check every 0.25s, up to total time of delay */
1792
for(int i=0; i < delay * 4; i++){
1793
if(interface_is_running(interface)){
1794
break;
1795
}
1796
struct timespec sleeptime = { .tv_nsec = 250000000 };
1797
ret = nanosleep(&sleeptime, NULL);
1798
if(ret == -1 and errno != EINTR){
1799
perror_plus("nanosleep");
1800
}
1801
}
1802
1803
errno = old_errno;
1804
return 0;
1805
}
1806
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
1810
struct ifreq network;
1811
unsigned int if_index = if_nametoindex(interface);
1812
if(if_index == 0){
1813
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1814
errno = old_errno;
1815
return ENXIO;
1816
}
1817
if(interface_is_up(interface)){
1818
error_t ret_errno = 0, ioctl_errno = 0;
1819
if(not get_flags(interface, &network) and debug){
1820
ret_errno = errno;
1821
fprintf_plus(stderr, "Failed to get flags for interface "
1822
"\"%s\"\n", interface);
1823
errno = old_errno;
1824
return ret_errno;
1825
}
1826
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1827
1828
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1829
if(sd == -1){
1830
ret_errno = errno;
1831
perror_plus("socket");
1832
errno = old_errno;
1833
return ret_errno;
1834
}
1835
1836
if(debug){
1837
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1838
interface);
1839
}
1840
1841
/* Raise privileges */
1842
ret_errno = raise_privileges();
1843
if(ret_errno != 0){
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;
976
1879
}
977
1880
978
1881
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 };
979
1886
AvahiSServiceBrowser *sb = NULL;
980
int error;
1887
error_t ret_errno;
981
1888
int ret;
982
1889
intmax_t tmpmax;
983
1890
char *tmp;
984
1891
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
986
struct ifreq network;
987
int sd = -1;
988
bool take_down_interface = false;
989
uid_t uid;
990
gid_t gid;
991
char *connect_to = NULL;
992
char tempdir[] = "/tmp/mandosXXXXXX";
993
bool tempdir_created = false;
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;
994
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
995
1898
const char *seckey = PATHDIR "/" SECKEY;
996
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
997
1901
998
1902
bool gnutls_initialized = false;
999
1903
bool gpgme_initialized = false;
1000
1904
float delay = 2.5f;
1905
double retry_interval = 10; /* 10s between trying a server and
1906
retrying the same server again */
1001
1907
1002
1908
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1003
1909
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
1915
errno = 0;
1010
1916
ret = setgid(gid);
1011
1917
if(ret == -1){
1012
perror("setgid");
1918
perror_plus("setgid");
1013
1919
}
1014
1920
1015
1921
/* Lower user privileges (temporarily) */
1016
1922
errno = 0;
1017
1923
ret = seteuid(uid);
1018
1924
if(ret == -1){
1019
perror("seteuid");
1925
perror_plus("seteuid");
1020
1926
}
1021
1927
1022
1928
if(quit_now){
1057
1963
.arg = "SECONDS",
1058
1964
.doc = "Maximum delay to wait for interface startup",
1059
1965
.group = 2 },
1966
{ .name = "retry", .key = 132,
1967
.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",
1973
.group = 2 },
1060
1974
/*
1061
1975
* These reproduce what we would get without ARGP_NO_HELP
1062
1976
*/
1080
1994
connect_to = arg;
1081
1995
break;
1082
1996
case 'i': /* --interface */
1083
interface = arg;
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
}
1084
2002
break;
1085
2003
case 's': /* --seckey */
1086
2004
seckey = arg;
1106
2024
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
2025
argp_error(state, "Bad delay");
1108
2026
}
2027
case 132: /* --retry */
2028
errno = 0;
2029
retry_interval = strtod(arg, &tmp);
2030
if(errno != 0 or tmp == arg or *tmp != '\0'
2031
or (retry_interval * 1000) > INT_MAX
2032
or retry_interval < 0){
2033
argp_error(state, "Bad retry interval");
2034
}
2035
break;
2036
case 133: /* --network-hook-dir */
2037
hookdir = arg;
1109
2038
break;
1110
2039
/*
1111
2040
* These reproduce what we would get without ARGP_NO_HELP
1118
2047
argp_state_help(state, state->out_stream,
1119
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
2049
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1122
2051
exit(argp_err_exit_status);
1123
2052
break;
1124
2053
default:
1139
2068
case ENOMEM:
1140
2069
default:
1141
2070
errno = ret;
1142
perror("argp_parse");
2071
perror_plus("argp_parse");
1143
2072
exitcode = EX_OSERR;
1144
2073
goto end;
1145
2074
case EINVAL:
1147
2076
goto end;
1148
2077
}
1149
2078
}
2079
2080
{
2081
/* Work around Debian bug #633582:
2082
<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);
2173
}
1150
2174
1151
2175
if(not debug){
1152
2176
avahi_set_log_function(empty_log);
1156
2180
from the signal handler */
1157
2181
/* Initialize the pseudo-RNG for Avahi */
1158
2182
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
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");
2187
exitcode = EX_UNAVAILABLE;
1163
2188
goto end;
1164
2189
}
1165
2190
1166
2191
sigemptyset(&sigterm_action.sa_mask);
1167
2192
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
2193
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
2194
perror_plus("sigaddset");
2195
exitcode = EX_OSERR;
1171
2196
goto end;
1172
2197
}
1173
2198
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
2199
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
2200
perror_plus("sigaddset");
2201
exitcode = EX_OSERR;
1177
2202
goto end;
1178
2203
}
1179
2204
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
2205
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
2206
perror_plus("sigaddset");
2207
exitcode = EX_OSERR;
1183
2208
goto end;
1184
2209
}
1185
2210
/* Need to check if the handler is SIG_IGN before handling:
1188
2213
*/
1189
2214
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
2215
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2216
perror_plus("sigaction");
2217
return EX_OSERR;
1193
2218
}
1194
2219
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
2220
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
2221
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2222
perror_plus("sigaction");
2223
exitcode = EX_OSERR;
1199
2224
goto end;
1200
2225
}
1201
2226
}
1202
2227
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
2228
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
2229
perror_plus("sigaction");
2230
return EX_OSERR;
1206
2231
}
1207
2232
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
2233
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
2234
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
2235
perror_plus("sigaction");
2236
exitcode = EX_OSERR;
1212
2237
goto end;
1213
2238
}
1214
2239
}
1215
2240
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
2241
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
2242
perror_plus("sigaction");
2243
return EX_OSERR;
1219
2244
}
1220
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
2246
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
2247
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
}
1228
1229
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1249
#ifdef __linux__
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
messages about the network interface to mess up the prompt */
1252
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1254
if(ret == -1){
1255
restore_loglevel = false;
1256
perror("klogctl");
1257
}
1258
#endif /* __linux__ */
1259
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1264
#ifdef __linux__
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1267
if(ret == -1){
1268
perror("klogctl");
1269
}
1270
}
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1278
goto end;
1279
}
1280
strcpy(network.ifr_name, interface);
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1284
#ifdef __linux__
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1287
if(ret == -1){
1288
perror("klogctl");
1289
}
1290
}
1291
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1299
goto end;
1300
}
1301
if((network.ifr_flags & IFF_UP) == 0){
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
if(ret == -1){
1306
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2250
goto end;
2251
}
2252
}
2253
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);
2276
} else {
2277
free(direntries);
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2279
exitcode = EXIT_FAILURE;
2280
goto end;
2281
}
2282
}
2283
2284
/* Bring up interfaces which are down, and remove any "none"s */
2285
{
2286
char *interface = NULL;
2287
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2288
interface))){
2289
/* If interface name is "none", stop bringing up interfaces.
2290
Also remove all instances of "none" from the list */
2291
if(strcmp(interface, "none") == 0){
2292
argz_delete(&mc.interfaces, &mc.interfaces_size,
2293
interface);
2294
interface = NULL;
2295
while((interface = argz_next(mc.interfaces,
2296
mc.interfaces_size, interface))){
2297
if(strcmp(interface, "none") == 0){
2298
argz_delete(&mc.interfaces, &mc.interfaces_size,
2299
interface);
2300
interface = NULL;
1314
2301
}
1315
2302
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
}
1326
/* sleep checking until interface is running */
1327
for(int i=0; i < delay * 4; i++){
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1331
} else if(network.ifr_flags & IFF_RUNNING){
1332
2303
break;
1333
2304
}
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
ret = nanosleep(&sleeptime, NULL);
1336
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1338
}
1339
}
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1346
}
1347
#ifdef __linux__
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1351
if(ret == -1){
1352
perror("klogctl");
1353
}
1354
}
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
2305
bool interface_was_up = interface_is_up(interface);
2306
errno = bring_up_interface(interface, delay);
2307
if(not interface_was_up){
2308
if(errno != 0){
2309
perror_plus("Failed to bring up interface");
2310
} else {
2311
errno = argz_add(&interfaces_to_take_down,
2312
&interfaces_to_take_down_size,
2313
interface);
2314
if(errno != 0){
2315
perror_plus("argz_add");
2316
}
2317
}
2318
}
2319
}
2320
if(debug and (interfaces_to_take_down == NULL)){
2321
fprintf_plus(stderr, "No interfaces were brought up\n");
2322
}
2323
}
2324
2325
/* If we only got one interface, explicitly use only that one */
2326
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2327
if(debug){
2328
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2329
mc.interfaces);
2330
}
2331
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1371
2332
}
1372
2333
1373
2334
if(quit_now){
1374
2335
goto end;
1375
2336
}
1376
2337
1377
ret = init_gnutls_global(pubkey, seckey);
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
1378
2339
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2341
exitcode = EX_UNAVAILABLE;
1381
2342
goto end;
1382
2343
} else {
1383
2344
gnutls_initialized = true;
1387
2348
goto end;
1388
2349
}
1389
2350
1390
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
2351
/* Try /run/tmp before /tmp */
2352
tempdir = mkdtemp(run_tempdir);
2353
if(tempdir == NULL and errno == ENOENT){
2354
if(debug){
2355
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2356
run_tempdir, old_tempdir);
2357
}
2358
tempdir = mkdtemp(old_tempdir);
2359
}
2360
if(tempdir == NULL){
2361
perror_plus("mkdtemp");
1394
2362
goto end;
1395
2363
}
1396
2364
1398
2366
goto end;
1399
2367
}
1400
2368
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2369
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2370
fprintf_plus(stderr, "init_gpgme failed\n");
2371
exitcode = EX_UNAVAILABLE;
1404
2372
goto end;
1405
2373
} else {
1406
2374
gpgme_initialized = true;
1414
2382
/* Connect directly, do not use Zeroconf */
1415
2383
/* (Mainly meant for debugging) */
1416
2384
char *address = strrchr(connect_to, ':');
2385
1417
2386
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2387
fprintf_plus(stderr, "No colon in address\n");
2388
exitcode = EX_USAGE;
1420
2389
goto end;
1421
2390
}
1422
2391
1424
2393
goto end;
1425
2394
}
1426
2395
1427
uint16_t port;
2396
in_port_t port;
1428
2397
errno = 0;
1429
2398
tmpmax = strtoimax(address+1, &tmp, 10);
1430
2399
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2400
or tmpmax != (in_port_t)tmpmax){
2401
fprintf_plus(stderr, "Bad port number\n");
2402
exitcode = EX_USAGE;
1434
2403
goto end;
1435
2404
}
1436
2405
1437
2406
if(quit_now){
1438
2407
goto end;
1439
2408
}
1440
2409
1441
port = (uint16_t)tmpmax;
2410
port = (in_port_t)tmpmax;
1442
2411
*address = '\0';
1443
address = connect_to;
1444
2412
/* Colon in address indicates IPv6 */
1445
2413
int af;
1446
if(strchr(address, ':') != NULL){
2414
if(strchr(connect_to, ':') != NULL){
1447
2415
af = AF_INET6;
2416
/* Accept [] around IPv6 address - see RFC 5952 */
2417
if(connect_to[0] == '[' and address[-1] == ']')
2418
{
2419
connect_to++;
2420
address[-1] = '\0';
2421
}
1448
2422
} else {
1449
2423
af = AF_INET;
1450
2424
}
2425
address = connect_to;
1451
2426
1452
2427
if(quit_now){
1453
2428
goto end;
1454
2429
}
1455
2430
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2431
while(not quit_now){
2432
ret = start_mandos_communication(address, port, if_index, af,
2433
&mc);
2434
if(quit_now or ret == 0){
2435
break;
2436
}
2437
if(debug){
2438
fprintf_plus(stderr, "Retrying in %d seconds\n",
2439
(int)retry_interval);
2440
}
2441
sleep((unsigned int)retry_interval);
2442
}
2443
2444
if(not quit_now){
1460
2445
exitcode = EXIT_SUCCESS;
1461
2446
}
2447
1462
2448
goto end;
1463
2449
}
1464
2450
1476
2462
config.publish_domain = 0;
1477
2463
1478
2464
/* Allocate a new server */
1479
mc.server = avahi_server_new(avahi_simple_poll_get
1480
(mc.simple_poll), &config, NULL,
1481
NULL, &error);
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2466
&config, NULL, NULL, &ret_errno);
1482
2467
1483
2468
/* Free the Avahi configuration data */
1484
2469
avahi_server_config_free(&config);
1486
2471
1487
2472
/* Check if creating the Avahi server object succeeded */
1488
2473
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2475
avahi_strerror(ret_errno));
2476
exitcode = EX_UNAVAILABLE;
1492
2477
goto end;
1493
2478
}
1494
2479
1499
2484
/* Create the Avahi service browser */
1500
2485
sb = avahi_s_service_browser_new(mc.server, if_index,
1501
2486
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
NULL, 0, browse_callback, NULL);
2487
NULL, 0, browse_callback,
2488
(void *)&mc);
1503
2489
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
2490
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2491
avahi_strerror(avahi_server_errno(mc.server)));
2492
exitcode = EX_UNAVAILABLE;
1507
2493
goto end;
1508
2494
}
1509
2495
1514
2500
/* Run the main loop */
1515
2501
1516
2502
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
2503
fprintf_plus(stderr, "Starting Avahi loop search\n");
1518
2504
}
1519
2505
1520
avahi_simple_poll_loop(mc.simple_poll);
2506
ret = avahi_loop_with_timeout(simple_poll,
2507
(int)(retry_interval * 1000), &mc);
2508
if(debug){
2509
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2510
(ret == 0) ? "successfully" : "with error");
2511
}
1521
2512
1522
2513
end:
1523
2514
1524
2515
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1526
2517
}
1527
2518
1528
2519
/* Cleanup things */
2520
free(mc.interfaces);
2521
1529
2522
if(sb != NULL)
1530
2523
avahi_s_service_browser_free(sb);
1531
2524
1532
2525
if(mc.server != NULL)
1533
2526
avahi_server_free(mc.server);
1534
2527
1535
if(mc.simple_poll != NULL)
1536
avahi_simple_poll_free(mc.simple_poll);
2528
if(simple_poll != NULL)
2529
avahi_simple_poll_free(simple_poll);
1537
2530
1538
2531
if(gnutls_initialized){
1539
2532
gnutls_certificate_free_credentials(mc.cred);
1545
2538
gpgme_release(mc.ctx);
1546
2539
}
1547
2540
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1580
/* Removes the temp directory used by GPGME */
1581
if(tempdir_created){
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1587
perror("opendir");
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
1602
char *fullname = NULL;
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
direntry->d_name);
1605
if(ret < 0){
1606
perror("asprintf");
1607
continue;
1608
}
1609
ret = remove(fullname);
1610
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
1613
}
1614
free(fullname);
1615
}
1616
closedir(d);
1617
}
1618
ret = rmdir(tempdir);
1619
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
2541
/* Cleans up the circular linked list of Mandos servers the client
2542
has seen */
2543
if(mc.current_server != NULL){
2544
mc.current_server->prev->next = NULL;
2545
while(mc.current_server != NULL){
2546
server *next = mc.current_server->next;
2547
free(mc.current_server);
2548
mc.current_server = next;
2549
}
2550
}
2551
2552
/* Re-raise privileges */
2553
{
2554
ret_errno = raise_privileges();
2555
if(ret_errno != 0){
2556
perror_plus("Failed to raise privileges");
2557
} else {
2558
2559
/* Run network hooks */
2560
run_network_hooks("stop", interfaces_hooks != NULL ?
2561
interfaces_hooks : "", delay);
2562
2563
/* Take down the network interfaces which were brought up */
2564
{
2565
char *interface = NULL;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2568
interface))){
2569
ret_errno = take_down_interface(interface);
2570
if(ret_errno != 0){
2571
errno = ret_errno;
2572
perror_plus("Failed to take down interface");
2573
}
2574
}
2575
if(debug and (interfaces_to_take_down == NULL)){
2576
fprintf_plus(stderr, "No interfaces needed to be taken"
2577
" down\n");
2578
}
2579
}
2580
}
2581
2582
ret_errno = lower_privileges_permanently();
2583
if(ret_errno != 0){
2584
perror_plus("Failed to lower privileges permanently");
2585
}
2586
}
2587
2588
free(interfaces_to_take_down);
2589
free(interfaces_hooks);
2590
2591
/* Removes the GPGME temp directory and all files inside */
2592
if(tempdir != NULL){
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2595
O_NOFOLLOW));
2596
if(tempdir_fd == -1){
2597
perror_plus("open");
2598
} else {
2599
#ifdef __GLIBC__
2600
#if __GLIBC_PREREQ(2, 15)
2601
int numentries = scandirat(tempdir_fd, ".", &direntries,
2602
notdotentries, alphasort);
2603
#else /* not __GLIBC_PREREQ(2, 15) */
2604
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
alphasort);
2606
#endif /* not __GLIBC_PREREQ(2, 15) */
2607
#else /* not __GLIBC__ */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC__ */
2611
if(numentries > 0){
2612
for(int i = 0; i < numentries; i++){
2613
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
if(ret == -1){
2615
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2616
" \"%s\", 0): %s\n", tempdir,
2617
direntries[i]->d_name, strerror(errno));
2618
}
2619
}
2620
2621
/* need to clean even if 0 because man page doesn't specify */
2622
free(direntries);
2623
if(numentries == -1){
2624
perror_plus("scandir");
2625
}
2626
ret = rmdir(tempdir);
2627
if(ret == -1 and errno != ENOENT){
2628
perror_plus("rmdir");
2629
}
2630
}
2631
TEMP_FAILURE_RETRY(close(tempdir_fd));
1621
2632
}
1622
2633
}
1623
2634
1628
2639
&old_sigterm_action,
1629
2640
NULL));
1630
2641
if(ret == -1){
1631
perror("sigaction");
2642
perror_plus("sigaction");
1632
2643
}
1633
2644
do {
1634
2645
ret = raise(signal_received);
1635
2646
} while(ret != 0 and errno == EINTR);
1636
2647
if(ret != 0){
1637
perror("raise");
2648
perror_plus("raise");
1638
2649
abort();
1639
2650
}
1640
2651
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0