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- Committer: Teddy Hogeborn
- Date: 2009-10-30 16:27:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20091030162717-dun2a9li8bu6jm2w
* Makefile (DOCBOOKTOMAN, DOCBOOKTOHTML, common.ent, mandos,
mandos-keygen, mandos-ctl, mandos.lsm): Add $(strip) to
make commands
easier to read
when run.
(plugins.d/mandos-client): Use $(LINK.c) to compile in the
same way as the other programs -
i.e. not via an object file.
mandos-keygen, mandos-ctl, mandos.lsm): Add $(strip) to
make commands
easier to read
when run.
(plugins.d/mandos-client): Use $(LINK.c) to compile in the
same way as the other programs -
i.e. not via an object file.
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), 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(), 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() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
84
82
#include <signal.h> /* sigemptyset(), sigaddset(),
85
83
sigaction(), SIGTERM, sig_atomic_t,
86
84
raise() */
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() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
98
86
99
87
#ifdef __linux__
100
88
#include <sys/klog.h> /* klogctl() */
118
106
init_gnutls_session(),
119
107
GNUTLS_* */
120
108
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
109
/* gnutls_certificate_set_openpgp_key_file(),
110
GNUTLS_OPENPGP_FMT_BASE64 */
123
111
124
112
/* GPGME */
125
113
#include <gpgme.h> /* All GPGME types, constants and
133
121
#define PATHDIR "/conf/conf.d/mandos"
134
122
#define SECKEY "seckey.txt"
135
123
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
124
138
125
bool debug = false;
139
126
static const char mandos_protocol_version[] = "1";
140
127
const char *argp_program_version = "mandos-client " VERSION;
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;
128
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
129
160
130
/* Used for passing in values through the Avahi callback functions */
161
131
typedef struct {
132
AvahiSimplePoll *simple_poll;
162
133
AvahiServer *server;
163
134
gnutls_certificate_credentials_t cred;
164
135
unsigned int dh_bits;
165
136
gnutls_dh_params_t dh_params;
166
137
const char *priority;
167
138
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
139
} mandos_context;
172
140
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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" };
175
145
176
146
sig_atomic_t quit_now = 0;
177
147
int signal_received = 0;
178
148
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
198
149
/*
199
150
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
151
* bytes. "buffer_capacity" is how much is currently allocated,
201
152
* "buffer_length" is how much is already used.
202
153
*/
203
__attribute__((nonnull, warn_unused_result))
204
154
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
155
size_t buffer_capacity){
206
156
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;
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
158
if(buffer == NULL){
213
159
return 0;
214
160
}
215
*buffer = new_buf;
216
161
buffer_capacity += BUFFER_SIZE;
217
162
}
218
163
return buffer_capacity;
219
164
}
220
165
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
259
166
/*
260
167
* Initialize GPGME.
261
168
*/
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){
169
static bool init_gpgme(const char *seckey,
170
const char *pubkey, const char *tempdir){
267
171
gpgme_error_t rc;
268
172
gpgme_engine_info_t engine_info;
269
173
174
270
175
/*
271
176
* Helper function to insert pub and seckey to the engine keyring.
272
177
*/
273
bool import_key(const char * const filename){
178
bool import_key(const char *filename){
274
179
int ret;
275
180
int fd;
276
181
gpgme_data_t pgp_data;
277
182
278
183
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
279
184
if(fd == -1){
280
perror_plus("open");
185
perror("open");
281
186
return false;
282
187
}
283
188
284
189
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
190
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));
191
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
192
gpgme_strsource(rc), gpgme_strerror(rc));
288
193
return false;
289
194
}
290
195
291
rc = gpgme_op_import(mc->ctx, pgp_data);
196
rc = gpgme_op_import(mc.ctx, pgp_data);
292
197
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
198
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
295
200
return false;
296
201
}
297
202
298
203
ret = (int)TEMP_FAILURE_RETRY(close(fd));
299
204
if(ret == -1){
300
perror_plus("close");
205
perror("close");
301
206
}
302
207
gpgme_data_release(pgp_data);
303
208
return true;
304
209
}
305
210
306
211
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
212
fprintf(stderr, "Initializing GPGME\n");
308
213
}
309
214
310
215
/* Init GPGME */
311
216
gpgme_check_version(NULL);
312
217
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
218
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));
219
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
316
221
return false;
317
222
}
318
223
319
/* Set GPGME home directory for the OpenPGP engine only */
224
/* Set GPGME home directory for the OpenPGP engine only */
320
225
rc = gpgme_get_engine_info(&engine_info);
321
226
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));
227
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
324
229
return false;
325
230
}
326
231
while(engine_info != NULL){
332
237
engine_info = engine_info->next;
333
238
}
334
239
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
240
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
337
241
return false;
338
242
}
339
243
340
244
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
245
rc = gpgme_new(&(mc.ctx));
342
246
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));
247
fprintf(stderr, "bad gpgme_new: %s: %s\n",
248
gpgme_strsource(rc), gpgme_strerror(rc));
346
249
return false;
347
250
}
348
251
357
260
* Decrypt OpenPGP data.
358
261
* Returns -1 on error
359
262
*/
360
__attribute__((nonnull, warn_unused_result))
361
263
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
264
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
265
char **plaintext){
365
266
gpgme_data_t dh_crypto, dh_plain;
366
267
gpgme_error_t rc;
367
268
ssize_t ret;
369
270
ssize_t plaintext_length = 0;
370
271
371
272
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
373
274
}
374
275
375
276
/* Create new GPGME data buffer from memory cryptotext */
376
277
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
278
0);
378
279
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));
280
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
381
282
return -1;
382
283
}
383
284
384
285
/* Create new empty GPGME data buffer for the plaintext */
385
286
rc = gpgme_data_new(&dh_plain);
386
287
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));
288
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
390
290
gpgme_data_release(dh_crypto);
391
291
return -1;
392
292
}
393
293
394
294
/* Decrypt data from the cryptotext data buffer to the plaintext
395
295
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
297
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
298
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
400
300
plaintext_length = -1;
401
301
if(debug){
402
302
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
303
result = gpgme_op_decrypt_result(mc.ctx);
404
304
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
406
306
} 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);
307
fprintf(stderr, "Unsupported algorithm: %s\n",
308
result->unsupported_algorithm);
309
fprintf(stderr, "Wrong key usage: %u\n",
310
result->wrong_key_usage);
411
311
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
fprintf(stderr, "File name: %s\n", result->file_name);
413
313
}
414
314
gpgme_recipient_t recipient;
415
315
recipient = result->recipients;
416
316
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");
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");
424
323
recipient = recipient->next;
425
324
}
426
325
}
429
328
}
430
329
431
330
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
433
332
}
434
333
435
334
/* Seek back to the beginning of the GPGME plaintext data buffer */
436
335
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
437
perror_plus("gpgme_data_seek");
336
perror("gpgme_data_seek");
438
337
plaintext_length = -1;
439
338
goto decrypt_end;
440
339
}
442
341
*plaintext = NULL;
443
342
while(true){
444
343
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
344
(size_t)plaintext_length,
345
plaintext_capacity);
447
346
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
347
perror("incbuffer");
348
plaintext_length = -1;
349
goto decrypt_end;
451
350
}
452
351
453
352
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
458
357
break;
459
358
}
460
359
if(ret < 0){
461
perror_plus("gpgme_data_read");
360
perror("gpgme_data_read");
462
361
plaintext_length = -1;
463
362
goto decrypt_end;
464
363
}
466
365
}
467
366
468
367
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
368
fprintf(stderr, "Decrypted password is: ");
470
369
for(ssize_t i = 0; i < plaintext_length; i++){
471
370
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
371
}
483
382
return plaintext_length;
484
383
}
485
384
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
385
static const char * safer_gnutls_strerror(int value){
386
const char *ret = gnutls_strerror(value); /* Spurious warning from
387
-Wunreachable-code */
489
388
if(ret == NULL)
490
389
ret = "(unknown)";
491
390
return ret;
492
391
}
493
392
494
393
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
394
static void debuggnutls(__attribute__((unused)) int level,
497
395
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
396
fprintf(stderr, "GnuTLS: %s", string);
499
397
}
500
398
501
__attribute__((nonnull, warn_unused_result))
502
399
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
400
const char *seckeyfilename){
505
401
int ret;
506
402
507
403
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
fprintf(stderr, "Initializing GnuTLS\n");
509
405
}
510
406
511
407
ret = gnutls_global_init();
512
408
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
409
fprintf(stderr, "GnuTLS global_init: %s\n",
410
safer_gnutls_strerror(ret));
515
411
return -1;
516
412
}
517
413
524
420
}
525
421
526
422
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
gnutls_certificate_allocate_credentials(&mc.cred);
528
424
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
425
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
426
from
427
-Wunreachable-code
428
*/
429
safer_gnutls_strerror(ret));
531
430
gnutls_global_deinit();
532
431
return -1;
533
432
}
534
433
535
434
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);
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
540
438
}
541
439
542
440
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
441
(mc.cred, pubkeyfilename, seckeyfilename,
544
442
GNUTLS_OPENPGP_FMT_BASE64);
545
443
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));
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));
551
449
goto globalfail;
552
450
}
553
451
554
452
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
453
ret = gnutls_dh_params_init(&mc.dh_params);
556
454
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
560
457
goto globalfail;
561
458
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
460
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
566
463
goto globalfail;
567
464
}
568
465
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
467
571
468
return 0;
572
469
573
470
globalfail:
574
471
575
gnutls_certificate_free_credentials(mc->cred);
472
gnutls_certificate_free_credentials(mc.cred);
576
473
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
474
gnutls_dh_params_deinit(mc.dh_params);
578
475
return -1;
579
476
}
580
477
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
478
static int init_gnutls_session(gnutls_session_t *session){
584
479
int ret;
585
480
/* GnuTLS session creation */
586
481
do {
590
485
}
591
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
487
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
596
490
}
597
491
598
492
{
599
493
const char *err;
600
494
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
496
if(quit_now){
603
497
gnutls_deinit(*session);
604
498
return -1;
605
499
}
606
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
501
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));
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
611
505
gnutls_deinit(*session);
612
506
return -1;
613
507
}
615
509
616
510
do {
617
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
512
mc.cred);
619
513
if(quit_now){
620
514
gnutls_deinit(*session);
621
515
return -1;
622
516
}
623
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
518
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
627
521
gnutls_deinit(*session);
628
522
return -1;
629
523
}
631
525
/* ignore client certificate if any. */
632
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
527
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
529
636
530
return 0;
637
531
}
641
535
__attribute__((unused)) const char *txt){}
642
536
643
537
/* 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,
538
static int start_mandos_communication(const char *ip, uint16_t port,
646
539
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
540
int af){
648
541
int ret, tcp_sd = -1;
649
542
ssize_t sret;
650
struct sockaddr_storage to;
543
union {
544
struct sockaddr_in in;
545
struct sockaddr_in6 in6;
546
} to;
651
547
char *buffer = NULL;
652
548
char *decrypted_buffer = NULL;
653
549
size_t buffer_length = 0;
657
553
gnutls_session_t session;
658
554
int pf; /* Protocol family */
659
555
660
errno = 0;
661
662
556
if(quit_now){
663
errno = EINTR;
664
557
return -1;
665
558
}
666
559
672
565
pf = PF_INET;
673
566
break;
674
567
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
676
errno = EINVAL;
568
fprintf(stderr, "Bad address family: %d\n", af);
677
569
return -1;
678
570
}
679
571
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);
572
ret = init_gnutls_session(&session);
713
573
if(ret != 0){
714
574
return -1;
715
575
}
716
576
717
577
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
578
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
579
"\n", ip, port);
720
580
}
721
581
722
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
723
583
if(tcp_sd < 0){
724
int e = errno;
725
perror_plus("socket");
726
errno = e;
584
perror("socket");
727
585
goto mandos_end;
728
586
}
729
587
730
588
if(quit_now){
731
errno = EINTR;
732
589
goto mandos_end;
733
590
}
734
591
735
592
memset(&to, 0, sizeof(to));
736
593
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);
594
to.in6.sin6_family = (sa_family_t)af;
595
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
596
} 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);
597
to.in.sin_family = (sa_family_t)af;
598
ret = inet_pton(af, ip, &to.in.sin_addr);
742
599
}
743
600
if(ret < 0 ){
744
int e = errno;
745
perror_plus("inet_pton");
746
errno = e;
601
perror("inet_pton");
747
602
goto mandos_end;
748
603
}
749
604
if(ret == 0){
750
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
752
errno = e;
605
fprintf(stderr, "Bad address: %s\n", ip);
753
606
goto mandos_end;
754
607
}
755
608
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)){
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*/
759
616
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
762
errno = EINVAL;
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
618
" without a network interface\n");
763
619
goto mandos_end;
764
620
}
765
621
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
to.in6.sin6_scope_id = (uint32_t)if_index;
767
623
}
768
624
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
625
to.in.sin_port = htons(port); /* Spurious warnings from
626
-Wconversion and
627
-Wunreachable-code */
770
628
}
771
629
772
630
if(quit_now){
773
errno = EINTR;
774
631
goto mandos_end;
775
632
}
776
633
778
635
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
779
636
char interface[IF_NAMESIZE];
780
637
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
perror_plus("if_indextoname");
638
perror("if_indextoname");
782
639
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
640
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
641
ip, interface, port);
785
642
}
786
643
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
644
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
645
port);
789
646
}
790
647
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
648
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
649
const char *pcret;
792
650
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
651
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
652
sizeof(addrstr));
797
653
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
654
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
655
sizeof(addrstr));
802
656
}
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);
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
}
809
663
}
810
664
}
811
665
812
666
if(quit_now){
813
errno = EINTR;
814
667
goto mandos_end;
815
668
}
816
669
817
670
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
671
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
672
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
673
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
674
}
824
675
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
int e = errno;
827
perror_plus("connect");
828
errno = e;
829
}
676
perror("connect");
830
677
goto mandos_end;
831
678
}
832
679
833
680
if(quit_now){
834
errno = EINTR;
835
681
goto mandos_end;
836
682
}
837
683
840
686
while(true){
841
687
size_t out_size = strlen(out);
842
688
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
689
out_size - written));
844
690
if(ret == -1){
845
int e = errno;
846
perror_plus("write");
847
errno = e;
691
perror("write");
848
692
goto mandos_end;
849
693
}
850
694
written += (size_t)ret;
860
704
}
861
705
862
706
if(quit_now){
863
errno = EINTR;
864
707
goto mandos_end;
865
708
}
866
709
}
867
710
868
711
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
870
713
}
871
714
872
715
if(quit_now){
873
errno = EINTR;
874
716
goto mandos_end;
875
717
}
876
718
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);
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
720
883
721
if(quit_now){
884
errno = EINTR;
885
722
goto mandos_end;
886
723
}
887
724
888
725
do {
889
726
ret = gnutls_handshake(session);
890
727
if(quit_now){
891
errno = EINTR;
892
728
goto mandos_end;
893
729
}
894
730
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
895
731
896
732
if(ret != GNUTLS_E_SUCCESS){
897
733
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
899
735
gnutls_perror(ret);
900
736
}
901
errno = EPROTO;
902
737
goto mandos_end;
903
738
}
904
739
905
740
/* Read OpenPGP packet that contains the wanted password */
906
741
907
742
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
743
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
744
ip);
910
745
}
911
746
912
747
while(true){
913
748
914
749
if(quit_now){
915
errno = EINTR;
916
750
goto mandos_end;
917
751
}
918
752
919
753
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
754
buffer_capacity);
921
755
if(buffer_capacity == 0){
922
int e = errno;
923
perror_plus("incbuffer");
924
errno = e;
756
perror("incbuffer");
925
757
goto mandos_end;
926
758
}
927
759
928
760
if(quit_now){
929
errno = EINTR;
930
761
goto mandos_end;
931
762
}
932
763
945
776
ret = gnutls_handshake(session);
946
777
947
778
if(quit_now){
948
errno = EINTR;
949
779
goto mandos_end;
950
780
}
951
781
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
782
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
955
784
gnutls_perror(ret);
956
errno = EPROTO;
957
785
goto mandos_end;
958
786
}
959
787
break;
960
788
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
789
fprintf(stderr, "Unknown error while reading data from"
790
" encrypted session with Mandos server\n");
963
791
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
errno = EIO;
965
792
goto mandos_end;
966
793
}
967
794
} else {
970
797
}
971
798
972
799
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
800
fprintf(stderr, "Closing TLS session\n");
974
801
}
975
802
976
803
if(quit_now){
977
errno = EINTR;
978
804
goto mandos_end;
979
805
}
980
806
981
807
do {
982
808
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
809
if(quit_now){
984
errno = EINTR;
985
810
goto mandos_end;
986
811
}
987
812
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
813
989
814
if(buffer_length > 0){
990
815
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
817
buffer_length,
818
&decrypted_buffer);
993
819
if(decrypted_buffer_size >= 0){
994
820
995
821
written = 0;
996
822
while(written < (size_t) decrypted_buffer_size){
997
823
if(quit_now){
998
errno = EINTR;
999
824
goto mandos_end;
1000
825
}
1001
826
1003
828
(size_t)decrypted_buffer_size - written,
1004
829
stdout);
1005
830
if(ret == 0 and ferror(stdout)){
1006
int e = errno;
1007
831
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
832
fprintf(stderr, "Error writing encrypted data: %s\n",
833
strerror(errno));
1010
834
}
1011
errno = e;
1012
835
goto mandos_end;
1013
836
}
1014
837
written += (size_t)ret;
1020
843
/* Shutdown procedure */
1021
844
1022
845
mandos_end:
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
}
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;
1042
857
}
1043
858
return retval;
1044
859
}
1045
860
1046
__attribute__((nonnull))
1047
861
static void resolve_callback(AvahiSServiceResolver *r,
1048
862
AvahiIfIndex interface,
1049
863
AvahiProtocol proto,
1057
871
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
872
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
873
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
874
AVAHI_GCC_UNUSED void* userdata){
875
assert(r);
1064
876
1065
877
/* Called whenever a service has been resolved successfully or
1066
878
timed out */
1072
884
switch(event){
1073
885
default:
1074
886
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)));
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)));
1080
890
break;
1081
891
1082
892
case AVAHI_RESOLVER_FOUND:
1084
894
char ip[AVAHI_ADDRESS_STR_MAX];
1085
895
avahi_address_snprint(ip, sizeof(ip), address);
1086
896
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);
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);
1090
900
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
901
int ret = start_mandos_communication(ip, port, interface,
902
avahi_proto_to_af(proto));
1095
903
if(ret == 0){
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
}
904
avahi_simple_poll_quit(mc.simple_poll);
1104
905
}
1105
906
}
1106
907
}
1116
917
const char *domain,
1117
918
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
919
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
920
AVAHI_GCC_UNUSED void* userdata){
921
assert(b);
1123
922
1124
923
/* Called whenever a new services becomes available on the LAN or
1125
924
is removed from the LAN */
1132
931
default:
1133
932
case AVAHI_BROWSER_FAILURE:
1134
933
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);
934
fprintf(stderr, "(Avahi browser) %s\n",
935
avahi_strerror(avahi_server_errno(mc.server)));
936
avahi_simple_poll_quit(mc.simple_poll);
1139
937
return;
1140
938
1141
939
case AVAHI_BROWSER_NEW:
1144
942
the callback function is called the Avahi server will free the
1145
943
resolver for us. */
1146
944
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)));
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)));
1155
950
break;
1156
951
1157
952
case AVAHI_BROWSER_REMOVE:
1160
955
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
956
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
957
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
958
fprintf(stderr, "No Mandos server found, still searching...\n");
1165
959
}
1166
960
break;
1167
961
}
1168
962
}
1169
963
1170
/* Signal handler that stops main loop after SIGTERM */
964
/* stop main loop after sigterm has been called */
1171
965
static void handle_sigterm(int sig){
1172
966
if(quit_now){
1173
967
return;
1175
969
quit_now = 1;
1176
970
signal_received = sig;
1177
971
int old_errno = 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
}
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;
972
if(mc.simple_poll != NULL){
973
avahi_simple_poll_quit(mc.simple_poll);
974
}
975
errno = old_errno;
1879
976
}
1880
977
1881
978
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
979
AvahiSServiceBrowser *sb = NULL;
1887
error_t ret_errno;
980
int error;
1888
981
int ret;
1889
982
intmax_t tmpmax;
1890
983
char *tmp;
1891
984
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;
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;
1897
994
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
995
const char *seckey = PATHDIR "/" SECKEY;
1899
996
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1901
997
1902
998
bool gnutls_initialized = false;
1903
999
bool gpgme_initialized = false;
1904
1000
float delay = 2.5f;
1905
double retry_interval = 10; /* 10s between trying a server and
1906
retrying the same server again */
1907
1001
1908
1002
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1909
1003
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1915
1009
errno = 0;
1916
1010
ret = setgid(gid);
1917
1011
if(ret == -1){
1918
perror_plus("setgid");
1012
perror("setgid");
1919
1013
}
1920
1014
1921
1015
/* Lower user privileges (temporarily) */
1922
1016
errno = 0;
1923
1017
ret = seteuid(uid);
1924
1018
if(ret == -1){
1925
perror_plus("seteuid");
1019
perror("seteuid");
1926
1020
}
1927
1021
1928
1022
if(quit_now){
1963
1057
.arg = "SECONDS",
1964
1058
.doc = "Maximum delay to wait for interface startup",
1965
1059
.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 },
1974
1060
/*
1975
1061
* These reproduce what we would get without ARGP_NO_HELP
1976
1062
*/
1994
1080
connect_to = arg;
1995
1081
break;
1996
1082
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
}
1083
interface = arg;
2002
1084
break;
2003
1085
case 's': /* --seckey */
2004
1086
seckey = arg;
2024
1106
if(errno != 0 or tmp == arg or *tmp != '\0'){
2025
1107
argp_error(state, "Bad delay");
2026
1108
}
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;
2038
1109
break;
2039
1110
/*
2040
1111
* These reproduce what we would get without ARGP_NO_HELP
2047
1118
argp_state_help(state, state->out_stream,
2048
1119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2049
1120
case 'V': /* --version */
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
2051
1122
exit(argp_err_exit_status);
2052
1123
break;
2053
1124
default:
2068
1139
case ENOMEM:
2069
1140
default:
2070
1141
errno = ret;
2071
perror_plus("argp_parse");
1142
perror("argp_parse");
2072
1143
exitcode = EX_OSERR;
2073
1144
goto end;
2074
1145
case EINVAL:
2076
1147
goto end;
2077
1148
}
2078
1149
}
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
}
2174
1150
2175
1151
if(not debug){
2176
1152
avahi_set_log_function(empty_log);
2180
1156
from the signal handler */
2181
1157
/* Initialize the pseudo-RNG for Avahi */
2182
1158
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");
2187
exitcode = EX_UNAVAILABLE;
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;
2188
1163
goto end;
2189
1164
}
2190
1165
2191
1166
sigemptyset(&sigterm_action.sa_mask);
2192
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2193
1168
if(ret == -1){
2194
perror_plus("sigaddset");
2195
exitcode = EX_OSERR;
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
2196
1171
goto end;
2197
1172
}
2198
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2199
1174
if(ret == -1){
2200
perror_plus("sigaddset");
2201
exitcode = EX_OSERR;
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
2202
1177
goto end;
2203
1178
}
2204
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2205
1180
if(ret == -1){
2206
perror_plus("sigaddset");
2207
exitcode = EX_OSERR;
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
2208
1183
goto end;
2209
1184
}
2210
1185
/* Need to check if the handler is SIG_IGN before handling:
2213
1188
*/
2214
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2215
1190
if(ret == -1){
2216
perror_plus("sigaction");
2217
return EX_OSERR;
1191
perror("sigaction");
1192
return EXIT_FAILURE;
2218
1193
}
2219
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
2220
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
2221
1196
if(ret == -1){
2222
perror_plus("sigaction");
2223
exitcode = EX_OSERR;
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
2224
1199
goto end;
2225
1200
}
2226
1201
}
2227
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2228
1203
if(ret == -1){
2229
perror_plus("sigaction");
2230
return EX_OSERR;
1204
perror("sigaction");
1205
return EXIT_FAILURE;
2231
1206
}
2232
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
2233
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2234
1209
if(ret == -1){
2235
perror_plus("sigaction");
2236
exitcode = EX_OSERR;
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
2237
1212
goto end;
2238
1213
}
2239
1214
}
2240
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2241
1216
if(ret == -1){
2242
perror_plus("sigaction");
2243
return EX_OSERR;
1217
perror("sigaction");
1218
return EXIT_FAILURE;
2244
1219
}
2245
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2247
1222
if(ret == -1){
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
2250
1225
goto end;
2251
1226
}
2252
1227
}
2253
1228
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);
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");
1314
}
1315
}
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
break;
1333
}
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
}
2276
1364
} 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);
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
2334
1371
}
2335
1372
2336
1373
if(quit_now){
2337
1374
goto end;
2338
1375
}
2339
1376
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
1377
ret = init_gnutls_global(pubkey, seckey);
2341
1378
if(ret == -1){
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2343
exitcode = EX_UNAVAILABLE;
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
2344
1381
goto end;
2345
1382
} else {
2346
1383
gnutls_initialized = true;
2350
1387
goto end;
2351
1388
}
2352
1389
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){
2363
perror_plus("mkdtemp");
1390
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
2364
1394
goto end;
2365
1395
}
2366
1396
2368
1398
goto end;
2369
1399
}
2370
1400
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2372
fprintf_plus(stderr, "init_gpgme failed\n");
2373
exitcode = EX_UNAVAILABLE;
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
2374
1404
goto end;
2375
1405
} else {
2376
1406
gpgme_initialized = true;
2384
1414
/* Connect directly, do not use Zeroconf */
2385
1415
/* (Mainly meant for debugging) */
2386
1416
char *address = strrchr(connect_to, ':');
2387
2388
1417
if(address == NULL){
2389
fprintf_plus(stderr, "No colon in address\n");
2390
exitcode = EX_USAGE;
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
2391
1420
goto end;
2392
1421
}
2393
1422
2395
1424
goto end;
2396
1425
}
2397
1426
2398
in_port_t port;
1427
uint16_t port;
2399
1428
errno = 0;
2400
1429
tmpmax = strtoimax(address+1, &tmp, 10);
2401
1430
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");
2404
exitcode = EX_USAGE;
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
2405
1434
goto end;
2406
1435
}
2407
1436
2408
1437
if(quit_now){
2409
1438
goto end;
2410
1439
}
2411
1440
2412
port = (in_port_t)tmpmax;
1441
port = (uint16_t)tmpmax;
2413
1442
*address = '\0';
1443
address = connect_to;
2414
1444
/* Colon in address indicates IPv6 */
2415
1445
int af;
2416
if(strchr(connect_to, ':') != NULL){
1446
if(strchr(address, ':') != NULL){
2417
1447
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
1448
} else {
2425
1449
af = AF_INET;
2426
1450
}
2427
address = connect_to;
2428
1451
2429
1452
if(quit_now){
2430
1453
goto end;
2431
1454
}
2432
1455
2433
while(not quit_now){
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2436
if(quit_now or ret == 0){
2437
break;
2438
}
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){
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
2447
1460
exitcode = EXIT_SUCCESS;
2448
1461
}
2449
2450
1462
goto end;
2451
1463
}
2452
1464
2464
1476
config.publish_domain = 0;
2465
1477
2466
1478
/* Allocate a new server */
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
1479
mc.server = avahi_server_new(avahi_simple_poll_get
1480
(mc.simple_poll), &config, NULL,
1481
NULL, &error);
2469
1482
2470
1483
/* Free the Avahi configuration data */
2471
1484
avahi_server_config_free(&config);
2473
1486
2474
1487
/* Check if creating the Avahi server object succeeded */
2475
1488
if(mc.server == NULL){
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
2478
exitcode = EX_UNAVAILABLE;
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
2479
1492
goto end;
2480
1493
}
2481
1494
2486
1499
/* Create the Avahi service browser */
2487
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
2488
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
1502
NULL, 0, browse_callback, NULL);
2491
1503
if(sb == NULL){
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2493
avahi_strerror(avahi_server_errno(mc.server)));
2494
exitcode = EX_UNAVAILABLE;
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
2495
1507
goto end;
2496
1508
}
2497
1509
2502
1514
/* Run the main loop */
2503
1515
2504
1516
if(debug){
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
1517
fprintf(stderr, "Starting Avahi loop search\n");
2506
1518
}
2507
1519
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2510
if(debug){
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2512
(ret == 0) ? "successfully" : "with error");
2513
}
1520
avahi_simple_poll_loop(mc.simple_poll);
2514
1521
2515
1522
end:
2516
1523
2517
1524
if(debug){
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1525
fprintf(stderr, "%s exiting\n", argv[0]);
2519
1526
}
2520
1527
2521
1528
/* Cleanup things */
2522
free(mc.interfaces);
2523
2524
1529
if(sb != NULL)
2525
1530
avahi_s_service_browser_free(sb);
2526
1531
2527
1532
if(mc.server != NULL)
2528
1533
avahi_server_free(mc.server);
2529
1534
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
1535
if(mc.simple_poll != NULL)
1536
avahi_simple_poll_free(mc.simple_poll);
2532
1537
2533
1538
if(gnutls_initialized){
2534
1539
gnutls_certificate_free_credentials(mc.cred);
2540
1545
gpgme_release(mc.ctx);
2541
1546
}
2542
1547
2543
/* Cleans up the circular linked list of Mandos servers the client
2544
has seen */
2545
if(mc.current_server != NULL){
2546
mc.current_server->prev->next = NULL;
2547
while(mc.current_server != NULL){
2548
server *next = mc.current_server->next;
2549
free(mc.current_server);
2550
mc.current_server = next;
2551
}
2552
}
2553
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
}
2583
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2589
}
2590
}
2591
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2594
2595
/* Removes the GPGME temp directory and all files inside */
2596
if(tempdir != NULL){
2597
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
}
2634
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
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");
2636
1621
}
2637
1622
}
2638
1623
2643
1628
&old_sigterm_action,
2644
1629
NULL));
2645
1630
if(ret == -1){
2646
perror_plus("sigaction");
1631
perror("sigaction");
2647
1632
}
2648
1633
do {
2649
1634
ret = raise(signal_received);
2650
1635
} while(ret != 0 and errno == EINTR);
2651
1636
if(ret != 0){
2652
perror_plus("raise");
1637
perror("raise");
2653
1638
abort();
2654
1639
}
2655
1640
TEMP_FAILURE_RETRY(pause());
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Version: 2.0.2.dev0