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237.2.192
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: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2010-09-13 06:19:45 UTC
- mto: (24.1.165 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100913061945-y6qw52q01ptn7q71
* mandos-keygen: Don't use "echo -e".
- files removed:
- debian/mandos-client.examples
- debian/source
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
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 */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
87
98
88
#ifdef __linux__
99
89
#include <sys/klog.h> /* klogctl() */
117
107
init_gnutls_session(),
118
108
GNUTLS_* */
119
109
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
122
112
123
113
/* GPGME */
124
114
#include <gpgme.h> /* All GPGME types, constants and
132
122
#define PATHDIR "/conf/conf.d/mandos"
133
123
#define SECKEY "seckey.txt"
134
124
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
125
137
126
bool debug = false;
138
127
static const char mandos_protocol_version[] = "1";
139
128
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
130
static const char sys_class_net[] = "/sys/class/net";
142
131
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
157
132
158
133
/* Used for passing in values through the Avahi callback functions */
159
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
160
136
AvahiServer *server;
161
137
gnutls_certificate_credentials_t cred;
162
138
unsigned int dh_bits;
163
139
gnutls_dh_params_t dh_params;
164
140
const char *priority;
165
141
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
142
} mandos_context;
170
143
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
148
174
149
sig_atomic_t quit_now = 0;
175
150
int signal_received = 0;
176
151
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
152
/*
197
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
154
* bytes. "buffer_capacity" is how much is currently allocated,
199
155
* "buffer_length" is how much is already used.
200
156
*/
201
__attribute__((nonnull, warn_unused_result))
202
157
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
158
size_t buffer_capacity){
204
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
211
162
return 0;
212
163
}
213
*buffer = new_buf;
214
164
buffer_capacity += BUFFER_SIZE;
215
165
}
216
166
return buffer_capacity;
217
167
}
218
168
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
257
169
/*
258
170
* Initialize GPGME.
259
171
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char *seckey, const char *pubkey,
262
const char *tempdir, mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
263
174
gpgme_error_t rc;
264
175
gpgme_engine_info_t engine_info;
265
176
177
266
178
/*
267
179
* Helper function to insert pub and seckey to the engine keyring.
268
180
*/
273
185
274
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
275
187
if(fd == -1){
276
perror_plus("open");
188
perror("open");
277
189
return false;
278
190
}
279
191
280
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
281
193
if(rc != GPG_ERR_NO_ERROR){
282
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
284
196
return false;
285
197
}
286
198
287
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
288
200
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
291
203
return false;
292
204
}
293
205
294
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
295
207
if(ret == -1){
296
perror_plus("close");
208
perror("close");
297
209
}
298
210
gpgme_data_release(pgp_data);
299
211
return true;
300
212
}
301
213
302
214
if(debug){
303
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
304
216
}
305
217
306
218
/* Init GPGME */
307
219
gpgme_check_version(NULL);
308
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
309
221
if(rc != GPG_ERR_NO_ERROR){
310
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
312
224
return false;
313
225
}
314
226
315
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
316
228
rc = gpgme_get_engine_info(&engine_info);
317
229
if(rc != GPG_ERR_NO_ERROR){
318
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
320
232
return false;
321
233
}
322
234
while(engine_info != NULL){
328
240
engine_info = engine_info->next;
329
241
}
330
242
if(engine_info == NULL){
331
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
332
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
244
return false;
334
245
}
335
246
336
247
/* Create new GPGME "context" */
337
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
338
249
if(rc != GPG_ERR_NO_ERROR){
339
fprintf_plus(stderr, "Mandos plugin mandos-client: "
340
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
341
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
342
252
return false;
343
253
}
344
254
353
263
* Decrypt OpenPGP data.
354
264
* Returns -1 on error
355
265
*/
356
__attribute__((nonnull, warn_unused_result))
357
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
358
267
size_t crypto_size,
359
char **plaintext,
360
mandos_context *mc){
268
char **plaintext){
361
269
gpgme_data_t dh_crypto, dh_plain;
362
270
gpgme_error_t rc;
363
271
ssize_t ret;
365
273
ssize_t plaintext_length = 0;
366
274
367
275
if(debug){
368
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
369
277
}
370
278
371
279
/* Create new GPGME data buffer from memory cryptotext */
372
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
373
281
0);
374
282
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
377
285
return -1;
378
286
}
379
287
380
288
/* Create new empty GPGME data buffer for the plaintext */
381
289
rc = gpgme_data_new(&dh_plain);
382
290
if(rc != GPG_ERR_NO_ERROR){
383
fprintf_plus(stderr, "Mandos plugin mandos-client: "
384
"bad gpgme_data_new: %s: %s\n",
385
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
386
293
gpgme_data_release(dh_crypto);
387
294
return -1;
388
295
}
389
296
390
297
/* Decrypt data from the cryptotext data buffer to the plaintext
391
298
data buffer */
392
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
393
300
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
396
303
plaintext_length = -1;
397
304
if(debug){
398
305
gpgme_decrypt_result_t result;
399
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
400
307
if(result == NULL){
401
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
402
309
} else {
403
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
404
result->unsupported_algorithm);
405
fprintf_plus(stderr, "Wrong key usage: %u\n",
406
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
407
314
if(result->file_name != NULL){
408
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
409
316
}
410
317
gpgme_recipient_t recipient;
411
318
recipient = result->recipients;
412
319
while(recipient != NULL){
413
fprintf_plus(stderr, "Public key algorithm: %s\n",
414
gpgme_pubkey_algo_name
415
(recipient->pubkey_algo));
416
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
417
fprintf_plus(stderr, "Secret key available: %s\n",
418
recipient->status == GPG_ERR_NO_SECKEY
419
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
420
326
recipient = recipient->next;
421
327
}
422
328
}
425
331
}
426
332
427
333
if(debug){
428
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
429
335
}
430
336
431
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
432
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
433
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
434
340
plaintext_length = -1;
435
341
goto decrypt_end;
436
342
}
438
344
*plaintext = NULL;
439
345
while(true){
440
346
plaintext_capacity = incbuffer(plaintext,
441
(size_t)plaintext_length,
442
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
443
349
if(plaintext_capacity == 0){
444
perror_plus("incbuffer");
445
plaintext_length = -1;
446
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
447
353
}
448
354
449
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
454
360
break;
455
361
}
456
362
if(ret < 0){
457
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
458
364
plaintext_length = -1;
459
365
goto decrypt_end;
460
366
}
462
368
}
463
369
464
370
if(debug){
465
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
466
372
for(ssize_t i = 0; i < plaintext_length; i++){
467
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
468
374
}
479
385
return plaintext_length;
480
386
}
481
387
482
__attribute__((warn_unused_result))
483
static const char *safer_gnutls_strerror(int value){
484
const char *ret = gnutls_strerror(value);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
485
391
if(ret == NULL)
486
392
ret = "(unknown)";
487
393
return ret;
488
394
}
489
395
490
396
/* GnuTLS log function callback */
491
__attribute__((nonnull))
492
397
static void debuggnutls(__attribute__((unused)) int level,
493
398
const char* string){
494
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
495
400
}
496
401
497
__attribute__((nonnull, warn_unused_result))
498
402
static int init_gnutls_global(const char *pubkeyfilename,
499
const char *seckeyfilename,
500
mandos_context *mc){
403
const char *seckeyfilename){
501
404
int ret;
502
405
503
406
if(debug){
504
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
505
408
}
506
409
507
410
ret = gnutls_global_init();
508
411
if(ret != GNUTLS_E_SUCCESS){
509
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
510
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
511
414
return -1;
512
415
}
513
416
520
423
}
521
424
522
425
/* OpenPGP credentials */
523
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
524
427
if(ret != GNUTLS_E_SUCCESS){
525
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
526
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
527
433
gnutls_global_deinit();
528
434
return -1;
529
435
}
530
436
531
437
if(debug){
532
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
533
" secret key %s as GnuTLS credentials\n",
534
pubkeyfilename,
535
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
536
441
}
537
442
538
443
ret = gnutls_certificate_set_openpgp_key_file
539
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
540
445
GNUTLS_OPENPGP_FMT_BASE64);
541
446
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr,
543
"Error[%d] while reading the OpenPGP key pair ('%s',"
544
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
545
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
546
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
547
452
goto globalfail;
548
453
}
549
454
550
455
/* GnuTLS server initialization */
551
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
552
457
if(ret != GNUTLS_E_SUCCESS){
553
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
554
" initialization: %s\n",
555
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
556
460
goto globalfail;
557
461
}
558
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
559
463
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
561
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
562
466
goto globalfail;
563
467
}
564
468
565
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
566
470
567
471
return 0;
568
472
569
473
globalfail:
570
474
571
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
572
476
gnutls_global_deinit();
573
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
574
478
return -1;
575
479
}
576
480
577
__attribute__((nonnull, warn_unused_result))
578
static int init_gnutls_session(gnutls_session_t *session,
579
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
580
482
int ret;
581
483
/* GnuTLS session creation */
582
484
do {
586
488
}
587
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
588
490
if(ret != GNUTLS_E_SUCCESS){
589
fprintf_plus(stderr,
590
"Error in GnuTLS session initialization: %s\n",
591
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
592
493
}
593
494
594
495
{
595
496
const char *err;
596
497
do {
597
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
598
499
if(quit_now){
599
500
gnutls_deinit(*session);
600
501
return -1;
601
502
}
602
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
603
504
if(ret != GNUTLS_E_SUCCESS){
604
fprintf_plus(stderr, "Syntax error at: %s\n", err);
605
fprintf_plus(stderr, "GnuTLS error: %s\n",
606
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
607
508
gnutls_deinit(*session);
608
509
return -1;
609
510
}
611
512
612
513
do {
613
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
614
mc->cred);
515
mc.cred);
615
516
if(quit_now){
616
517
gnutls_deinit(*session);
617
518
return -1;
618
519
}
619
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
620
521
if(ret != GNUTLS_E_SUCCESS){
621
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
622
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
623
524
gnutls_deinit(*session);
624
525
return -1;
625
526
}
627
528
/* ignore client certificate if any. */
628
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
629
530
630
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
631
532
632
533
return 0;
633
534
}
637
538
__attribute__((unused)) const char *txt){}
638
539
639
540
/* Called when a Mandos server is found */
640
__attribute__((nonnull, warn_unused_result))
641
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
642
542
AvahiIfIndex if_index,
643
int af, mandos_context *mc){
543
int af){
644
544
int ret, tcp_sd = -1;
645
545
ssize_t sret;
646
struct sockaddr_storage to;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
647
550
char *buffer = NULL;
648
551
char *decrypted_buffer = NULL;
649
552
size_t buffer_length = 0;
668
571
pf = PF_INET;
669
572
break;
670
573
default:
671
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
672
575
errno = EINVAL;
673
576
return -1;
674
577
}
675
578
676
/* If the interface is specified and we have a list of interfaces */
677
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
678
/* Check if the interface is one of the interfaces we are using */
679
bool match = false;
680
{
681
char *interface = NULL;
682
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
683
interface))){
684
if(if_nametoindex(interface) == (unsigned int)if_index){
685
match = true;
686
break;
687
}
688
}
689
}
690
if(not match){
691
/* This interface does not match any in the list, so we don't
692
connect to the server */
693
if(debug){
694
char interface[IF_NAMESIZE];
695
if(if_indextoname((unsigned int)if_index, interface) == NULL){
696
perror_plus("if_indextoname");
697
} else {
698
fprintf_plus(stderr, "Skipping server on non-used interface"
699
" \"%s\"\n",
700
if_indextoname((unsigned int)if_index,
701
interface));
702
}
703
}
704
return -1;
705
}
706
}
707
708
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
709
580
if(ret != 0){
710
581
return -1;
711
582
}
712
583
713
584
if(debug){
714
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
715
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
716
587
}
717
588
718
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
719
590
if(tcp_sd < 0){
720
591
int e = errno;
721
perror_plus("socket");
592
perror("socket");
722
593
errno = e;
723
594
goto mandos_end;
724
595
}
730
601
731
602
memset(&to, 0, sizeof(to));
732
603
if(af == AF_INET6){
733
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
734
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
606
} else { /* IPv4 */
736
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
738
609
}
739
610
if(ret < 0 ){
740
611
int e = errno;
741
perror_plus("inet_pton");
612
perror("inet_pton");
742
613
errno = e;
743
614
goto mandos_end;
744
615
}
745
616
if(ret == 0){
746
617
int e = errno;
747
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
748
619
errno = e;
749
620
goto mandos_end;
750
621
}
751
622
if(af == AF_INET6){
752
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
753
if(IN6_IS_ADDR_LINKLOCAL
754
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
755
630
if(if_index == AVAHI_IF_UNSPEC){
756
fprintf_plus(stderr, "An IPv6 link-local address is"
757
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
758
633
errno = EINVAL;
759
634
goto mandos_end;
760
635
}
761
636
/* Set the network interface number as scope */
762
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
637
to.in6.sin6_scope_id = (uint32_t)if_index;
763
638
}
764
639
} else {
765
((struct sockaddr_in *)&to)->sin_port = htons(port);
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
766
643
}
767
644
768
645
if(quit_now){
774
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
775
652
char interface[IF_NAMESIZE];
776
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
777
perror_plus("if_indextoname");
654
perror("if_indextoname");
778
655
} else {
779
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
780
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
781
658
}
782
659
} else {
783
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
784
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
785
662
}
786
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
787
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
788
666
if(af == AF_INET6){
789
ret = getnameinfo((struct sockaddr *)&to,
790
sizeof(struct sockaddr_in6),
791
addrstr, sizeof(addrstr), NULL, 0,
792
NI_NUMERICHOST);
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
793
669
} else {
794
ret = getnameinfo((struct sockaddr *)&to,
795
sizeof(struct sockaddr_in),
796
addrstr, sizeof(addrstr), NULL, 0,
797
NI_NUMERICHOST);
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
798
672
}
799
if(ret == EAI_SYSTEM){
800
perror_plus("getnameinfo");
801
} else if(ret != 0) {
802
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
803
} else if(strcmp(addrstr, ip) != 0){
804
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
673
if(pcret == NULL){
674
perror("inet_ntop");
675
} else {
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
678
}
805
679
}
806
680
}
807
681
811
685
}
812
686
813
687
if(af == AF_INET6){
814
ret = connect(tcp_sd, (struct sockaddr *)&to,
815
sizeof(struct sockaddr_in6));
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
689
} else {
817
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
818
sizeof(struct sockaddr_in));
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
691
}
820
692
if(ret < 0){
821
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
822
694
int e = errno;
823
perror_plus("connect");
695
perror("connect");
824
696
errno = e;
825
697
}
826
698
goto mandos_end;
836
708
while(true){
837
709
size_t out_size = strlen(out);
838
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
839
out_size - written));
711
out_size - written));
840
712
if(ret == -1){
841
713
int e = errno;
842
perror_plus("write");
714
perror("write");
843
715
errno = e;
844
716
goto mandos_end;
845
717
}
862
734
}
863
735
864
736
if(debug){
865
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
866
738
}
867
739
868
740
if(quit_now){
870
742
goto mandos_end;
871
743
}
872
744
873
/* This casting via intptr_t is to eliminate warning about casting
874
an int to a pointer type. This is exactly how the GnuTLS Guile
875
function "set-session-transport-fd!" does it. */
876
gnutls_transport_set_ptr(session,
877
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
878
746
879
747
if(quit_now){
880
748
errno = EINTR;
891
759
892
760
if(ret != GNUTLS_E_SUCCESS){
893
761
if(debug){
894
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
895
763
gnutls_perror(ret);
896
764
}
897
765
errno = EPROTO;
901
769
/* Read OpenPGP packet that contains the wanted password */
902
770
903
771
if(debug){
904
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
905
" %s\n", ip);
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
773
ip);
906
774
}
907
775
908
776
while(true){
913
781
}
914
782
915
783
buffer_capacity = incbuffer(&buffer, buffer_length,
916
buffer_capacity);
784
buffer_capacity);
917
785
if(buffer_capacity == 0){
918
786
int e = errno;
919
perror_plus("incbuffer");
787
perror("incbuffer");
920
788
errno = e;
921
789
goto mandos_end;
922
790
}
946
814
}
947
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
948
816
if(ret < 0){
949
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
950
"***\n");
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
818
gnutls_perror(ret);
952
819
errno = EPROTO;
953
820
goto mandos_end;
954
821
}
955
822
break;
956
823
default:
957
fprintf_plus(stderr, "Unknown error while reading data from"
958
" encrypted session with Mandos server\n");
824
fprintf(stderr, "Unknown error while reading data from"
825
" encrypted session with Mandos server\n");
959
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
960
827
errno = EIO;
961
828
goto mandos_end;
966
833
}
967
834
968
835
if(debug){
969
fprintf_plus(stderr, "Closing TLS session\n");
836
fprintf(stderr, "Closing TLS session\n");
970
837
}
971
838
972
839
if(quit_now){
984
851
985
852
if(buffer_length > 0){
986
853
ssize_t decrypted_buffer_size;
987
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
988
&decrypted_buffer, mc);
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
855
buffer_length,
856
&decrypted_buffer);
989
857
if(decrypted_buffer_size >= 0){
990
858
991
859
written = 0;
1001
869
if(ret == 0 and ferror(stdout)){
1002
870
int e = errno;
1003
871
if(debug){
1004
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1005
strerror(errno));
872
fprintf(stderr, "Error writing encrypted data: %s\n",
873
strerror(errno));
1006
874
}
1007
875
errno = e;
1008
876
goto mandos_end;
1027
895
if(e == 0){
1028
896
e = errno;
1029
897
}
1030
perror_plus("close");
898
perror("close");
1031
899
}
1032
900
gnutls_deinit(session);
1033
errno = e;
1034
901
if(quit_now){
1035
errno = EINTR;
902
e = EINTR;
1036
903
retval = -1;
1037
904
}
905
errno = e;
1038
906
}
1039
907
return retval;
1040
908
}
1041
909
1042
__attribute__((nonnull))
1043
910
static void resolve_callback(AvahiSServiceResolver *r,
1044
911
AvahiIfIndex interface,
1045
912
AvahiProtocol proto,
1053
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
1054
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
922
flags,
1056
void *mc){
1057
if(r == NULL){
1058
return;
1059
}
923
AVAHI_GCC_UNUSED void* userdata){
924
assert(r);
1060
925
1061
926
/* Called whenever a service has been resolved successfully or
1062
927
timed out */
1068
933
switch(event){
1069
934
default:
1070
935
case AVAHI_RESOLVER_FAILURE:
1071
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1072
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1073
domain,
1074
avahi_strerror(avahi_server_errno
1075
(((mandos_context*)mc)->server)));
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
1076
939
break;
1077
940
1078
941
case AVAHI_RESOLVER_FOUND:
1080
943
char ip[AVAHI_ADDRESS_STR_MAX];
1081
944
avahi_address_snprint(ip, sizeof(ip), address);
1082
945
if(debug){
1083
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1084
PRIdMAX ") on port %" PRIu16 "\n", name,
1085
host_name, ip, (intmax_t)interface, port);
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
1086
949
}
1087
int ret = start_mandos_communication(ip, (in_port_t)port,
1088
interface,
1089
avahi_proto_to_af(proto),
1090
mc);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
1091
952
if(ret == 0){
1092
avahi_simple_poll_quit(simple_poll);
1093
} else {
1094
if(not add_server(ip, (in_port_t)port, interface,
1095
avahi_proto_to_af(proto),
1096
&((mandos_context*)mc)->current_server)){
1097
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1098
" list\n", name);
1099
}
953
avahi_simple_poll_quit(mc.simple_poll);
1100
954
}
1101
955
}
1102
956
}
1112
966
const char *domain,
1113
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1114
968
flags,
1115
void *mc){
1116
if(b == NULL){
1117
return;
1118
}
969
AVAHI_GCC_UNUSED void* userdata){
970
assert(b);
1119
971
1120
972
/* Called whenever a new services becomes available on the LAN or
1121
973
is removed from the LAN */
1128
980
default:
1129
981
case AVAHI_BROWSER_FAILURE:
1130
982
1131
fprintf_plus(stderr, "(Avahi browser) %s\n",
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1134
avahi_simple_poll_quit(simple_poll);
983
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
1135
986
return;
1136
987
1137
988
case AVAHI_BROWSER_NEW:
1140
991
the callback function is called the Avahi server will free the
1141
992
resolver for us. */
1142
993
1143
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1144
interface, protocol, name, type,
1145
domain, protocol, 0,
1146
resolve_callback, mc) == NULL)
1147
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1148
" %s\n", name,
1149
avahi_strerror(avahi_server_errno
1150
(((mandos_context*)mc)->server)));
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
1151
999
break;
1152
1000
1153
1001
case AVAHI_BROWSER_REMOVE:
1156
1004
case AVAHI_BROWSER_ALL_FOR_NOW:
1157
1005
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1158
1006
if(debug){
1159
fprintf_plus(stderr, "No Mandos server found, still"
1160
" searching...\n");
1007
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
1008
}
1162
1009
break;
1163
1010
}
1164
1011
}
1165
1012
1166
/* Signal handler that stops main loop after SIGTERM */
1013
/* stop main loop after sigterm has been called */
1167
1014
static void handle_sigterm(int sig){
1168
1015
if(quit_now){
1169
1016
return;
1171
1018
quit_now = 1;
1172
1019
signal_received = sig;
1173
1020
int old_errno = errno;
1174
/* set main loop to exit */
1175
if(simple_poll != NULL){
1176
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1177
1023
}
1178
1024
errno = old_errno;
1179
1025
}
1180
1026
1181
__attribute__((nonnull, warn_unused_result))
1182
bool get_flags(const char *ifname, struct ifreq *ifr){
1183
int ret;
1184
error_t ret_errno;
1185
1186
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1187
if(s < 0){
1188
ret_errno = errno;
1189
perror_plus("socket");
1190
errno = ret_errno;
1191
return false;
1192
}
1193
strcpy(ifr->ifr_name, ifname);
1194
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1195
if(ret == -1){
1196
if(debug){
1197
ret_errno = errno;
1198
perror_plus("ioctl SIOCGIFFLAGS");
1199
errno = ret_errno;
1200
}
1201
return false;
1202
}
1203
return true;
1204
}
1205
1206
__attribute__((nonnull, warn_unused_result))
1207
bool good_flags(const char *ifname, const struct ifreq *ifr){
1208
1209
/* Reject the loopback device */
1210
if(ifr->ifr_flags & IFF_LOOPBACK){
1211
if(debug){
1212
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1213
ifname);
1214
}
1215
return false;
1216
}
1217
/* Accept point-to-point devices only if connect_to is specified */
1218
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1219
if(debug){
1220
fprintf_plus(stderr, "Accepting point-to-point interface"
1221
" \"%s\"\n", ifname);
1222
}
1223
return true;
1224
}
1225
/* Otherwise, reject non-broadcast-capable devices */
1226
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1229
" \"%s\"\n", ifname);
1230
}
1231
return false;
1232
}
1233
/* Reject non-ARP interfaces (including dummy interfaces) */
1234
if(ifr->ifr_flags & IFF_NOARP){
1235
if(debug){
1236
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1237
ifname);
1238
}
1239
return false;
1240
}
1241
1242
/* Accept this device */
1243
if(debug){
1244
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1245
}
1246
return true;
1247
}
1248
1249
1027
/*
1250
1028
* This function determines if a directory entry in /sys/class/net
1251
1029
* corresponds to an acceptable network device.
1252
1030
* (This function is passed to scandir(3) as a filter function.)
1253
1031
*/
1254
__attribute__((nonnull, warn_unused_result))
1255
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1256
1041
if(if_entry->d_name[0] == '.'){
1257
1042
return 0;
1258
1043
}
1259
1260
struct ifreq ifr;
1261
if(not get_flags(if_entry->d_name, &ifr)){
1262
if(debug){
1263
fprintf_plus(stderr, "Failed to get flags for interface "
1264
"\"%s\"\n", if_entry->d_name);
1265
}
1266
return 0;
1267
}
1268
1269
if(not good_flags(if_entry->d_name, &ifr)){
1270
return 0;
1271
}
1272
return 1;
1273
}
1274
1275
/*
1276
* This function determines if a network interface is up.
1277
*/
1278
__attribute__((nonnull, warn_unused_result))
1279
bool interface_is_up(const char *interface){
1280
struct ifreq ifr;
1281
if(not get_flags(interface, &ifr)){
1282
if(debug){
1283
fprintf_plus(stderr, "Failed to get flags for interface "
1284
"\"%s\"\n", interface);
1285
}
1286
return false;
1287
}
1288
1289
return (bool)(ifr.ifr_flags & IFF_UP);
1290
}
1291
1292
/*
1293
* This function determines if a network interface is running
1294
*/
1295
__attribute__((nonnull, warn_unused_result))
1296
bool interface_is_running(const char *interface){
1297
struct ifreq ifr;
1298
if(not get_flags(interface, &ifr)){
1299
if(debug){
1300
fprintf_plus(stderr, "Failed to get flags for interface "
1301
"\"%s\"\n", interface);
1302
}
1303
return false;
1304
}
1305
1306
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1307
}
1308
1309
__attribute__((nonnull, pure, warn_unused_result))
1310
int notdotentries(const struct dirent *direntry){
1311
/* Skip "." and ".." */
1312
if(direntry->d_name[0] == '.'
1313
and (direntry->d_name[1] == '\0'
1314
or (direntry->d_name[1] == '.'
1315
and direntry->d_name[2] == '\0'))){
1316
return 0;
1317
}
1318
return 1;
1319
}
1320
1321
/* Is this directory entry a runnable program? */
1322
__attribute__((nonnull, warn_unused_result))
1323
int runnable_hook(const struct dirent *direntry){
1324
int ret;
1325
size_t sret;
1326
struct stat st;
1327
1328
if((direntry->d_name)[0] == '\0'){
1329
/* Empty name? */
1330
return 0;
1331
}
1332
1333
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1334
"abcdefghijklmnopqrstuvwxyz"
1335
"0123456789"
1336
"_-");
1337
if((direntry->d_name)[sret] != '\0'){
1338
/* Contains non-allowed characters */
1339
if(debug){
1340
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1341
direntry->d_name);
1342
}
1343
return 0;
1344
}
1345
1346
char *fullname = NULL;
1347
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1348
if(ret < 0){
1349
perror_plus("asprintf");
1350
return 0;
1351
}
1352
1353
ret = stat(fullname, &st);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
return 0;
1048
}
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1050
/* read line from flags_fd */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1053
flagstring[(size_t)to_read] = '\0';
1054
if(flagstring == NULL){
1055
perror("malloc");
1056
close(flags_fd);
1057
return 0;
1058
}
1059
while(to_read > 0){
1060
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1061
(size_t)to_read));
1062
if(ssret == -1){
1063
perror("read");
1064
free(flagstring);
1065
close(flags_fd);
1066
return 0;
1067
}
1068
to_read -= ssret;
1069
if(ssret == 0){
1070
break;
1071
}
1072
}
1073
close(flags_fd);
1074
intmax_t tmpmax;
1075
char *tmp;
1076
errno = 0;
1077
tmpmax = strtoimax(flagstring, &tmp, 0);
1078
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1079
and not (isspace(*tmp)))
1080
or tmpmax != (ifreq_flags)tmpmax){
1081
if(debug){
1082
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1083
flagstring, if_entry->d_name);
1084
}
1085
free(flagstring);
1086
return 0;
1087
}
1088
free(flagstring);
1089
ifreq_flags flags = (ifreq_flags)tmpmax;
1090
/* Reject the loopback device */
1091
if(flags & IFF_LOOPBACK){
1092
if(debug){
1093
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1094
if_entry->d_name);
1095
}
1096
return 0;
1097
}
1098
/* Accept point-to-point devices only if connect_to is specified */
1099
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1100
if(debug){
1101
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1102
if_entry->d_name);
1103
}
1104
return 1;
1105
}
1106
/* Otherwise, reject non-broadcast-capable devices */
1107
if(not (flags & IFF_BROADCAST)){
1108
if(debug){
1109
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1110
if_entry->d_name);
1111
}
1112
return 0;
1113
}
1114
/* Accept this device */
1376
1115
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1116
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1117
if_entry->d_name);
1379
1118
}
1380
1119
return 1;
1381
1120
}
1382
1121
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1386
int ret;
1387
struct timespec now;
1388
struct timespec waited_time;
1389
intmax_t block_time;
1390
1391
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1396
}
1397
ret = avahi_simple_poll_iterate(s, -1);
1398
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1402
}
1403
/* the current time */
1404
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
if(ret == -1){
1406
perror_plus("clock_gettime");
1407
return -1;
1408
}
1409
/* Calculating in ms how long time between now and server
1410
who we visted longest time ago. Now - last seen. */
1411
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1413
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1415
/* total time is 10s/10,000ms.
1416
Converting to s from ms by dividing by 1,000,
1417
and ns to ms by dividing by 1,000,000. */
1418
block_time = ((retry_interval
1419
- ((intmax_t)waited_time.tv_sec * 1000))
1420
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1425
}
1426
1427
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1432
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1434
return 0;
1435
}
1436
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1438
if(ret == -1){
1439
perror_plus("clock_gettime");
1440
return -1;
1441
}
1442
mc->current_server = mc->current_server->next;
1443
block_time = 0; /* Call avahi to find new Mandos
1444
servers, but don't block */
1445
}
1446
1447
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
}
1449
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1451
return (ret != 1) ? ret : 0;
1452
}
1453
}
1454
}
1455
}
1456
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
perror_plus("seteuid");
1465
}
1466
errno = old_errno;
1467
return ret_errno;
1468
}
1469
1470
/* Set effective and real user ID to 0. Return errno. */
1471
__attribute__((warn_unused_result))
1472
error_t raise_privileges_permanently(void){
1473
error_t old_errno = errno;
1474
error_t ret_errno = raise_privileges();
1475
if(ret_errno != 0){
1476
errno = old_errno;
1477
return ret_errno;
1478
}
1479
if(setuid(0) == -1){
1480
ret_errno = errno;
1481
perror_plus("seteuid");
1482
}
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
1487
/* Set effective user ID to unprivileged saved user ID */
1488
__attribute__((warn_unused_result))
1489
error_t lower_privileges(void){
1490
error_t old_errno = errno;
1491
error_t ret_errno = 0;
1492
if(seteuid(uid) == -1){
1493
ret_errno = errno;
1494
perror_plus("seteuid");
1495
}
1496
errno = old_errno;
1497
return ret_errno;
1498
}
1499
1500
/* Lower privileges permanently */
1501
__attribute__((warn_unused_result))
1502
error_t lower_privileges_permanently(void){
1503
error_t old_errno = errno;
1504
error_t ret_errno = 0;
1505
if(setuid(uid) == -1){
1506
ret_errno = errno;
1507
perror_plus("setuid");
1508
}
1509
errno = old_errno;
1510
return ret_errno;
1511
}
1512
1513
__attribute__((nonnull))
1514
void run_network_hooks(const char *mode, const char *interface,
1515
const float delay){
1516
struct dirent **direntries;
1517
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1518
alphasort);
1519
if(numhooks == -1){
1520
if(errno == ENOENT){
1521
if(debug){
1522
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1523
" found\n", hookdir);
1524
}
1525
} else {
1526
perror_plus("scandir");
1527
}
1528
} else {
1529
struct dirent *direntry;
1530
int ret;
1531
int devnull = open("/dev/null", O_RDONLY);
1532
for(int i = 0; i < numhooks; i++){
1533
direntry = direntries[i];
1534
char *fullname = NULL;
1535
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1536
if(ret < 0){
1537
perror_plus("asprintf");
1538
continue;
1539
}
1540
if(debug){
1541
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1542
direntry->d_name);
1543
}
1544
pid_t hook_pid = fork();
1545
if(hook_pid == 0){
1546
/* Child */
1547
/* Raise privileges */
1548
if(raise_privileges_permanently() != 0){
1549
perror_plus("Failed to raise privileges");
1550
_exit(EX_NOPERM);
1551
}
1552
/* Set group */
1553
errno = 0;
1554
ret = setgid(0);
1555
if(ret == -1){
1556
perror_plus("setgid");
1557
_exit(EX_NOPERM);
1558
}
1559
/* Reset supplementary groups */
1560
errno = 0;
1561
ret = setgroups(0, NULL);
1562
if(ret == -1){
1563
perror_plus("setgroups");
1564
_exit(EX_NOPERM);
1565
}
1566
ret = dup2(devnull, STDIN_FILENO);
1567
if(ret == -1){
1568
perror_plus("dup2(devnull, STDIN_FILENO)");
1569
_exit(EX_OSERR);
1570
}
1571
ret = close(devnull);
1572
if(ret == -1){
1573
perror_plus("close");
1574
_exit(EX_OSERR);
1575
}
1576
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1577
if(ret == -1){
1578
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1579
_exit(EX_OSERR);
1580
}
1581
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1582
if(ret == -1){
1583
perror_plus("setenv");
1584
_exit(EX_OSERR);
1585
}
1586
ret = setenv("DEVICE", interface, 1);
1587
if(ret == -1){
1588
perror_plus("setenv");
1589
_exit(EX_OSERR);
1590
}
1591
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1592
if(ret == -1){
1593
perror_plus("setenv");
1594
_exit(EX_OSERR);
1595
}
1596
ret = setenv("MODE", mode, 1);
1597
if(ret == -1){
1598
perror_plus("setenv");
1599
_exit(EX_OSERR);
1600
}
1601
char *delaystring;
1602
ret = asprintf(&delaystring, "%f", (double)delay);
1603
if(ret == -1){
1604
perror_plus("asprintf");
1605
_exit(EX_OSERR);
1606
}
1607
ret = setenv("DELAY", delaystring, 1);
1608
if(ret == -1){
1609
free(delaystring);
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
free(delaystring);
1614
if(connect_to != NULL){
1615
ret = setenv("CONNECT", connect_to, 1);
1616
if(ret == -1){
1617
perror_plus("setenv");
1618
_exit(EX_OSERR);
1619
}
1620
}
1621
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1622
perror_plus("execl");
1623
_exit(EXIT_FAILURE);
1624
}
1625
} else {
1626
int status;
1627
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1628
perror_plus("waitpid");
1629
free(fullname);
1630
continue;
1631
}
1632
if(WIFEXITED(status)){
1633
if(WEXITSTATUS(status) != 0){
1634
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1635
" with status %d\n", direntry->d_name,
1636
WEXITSTATUS(status));
1637
free(fullname);
1638
continue;
1639
}
1640
} else if(WIFSIGNALED(status)){
1641
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1642
" signal %d\n", direntry->d_name,
1643
WTERMSIG(status));
1644
free(fullname);
1645
continue;
1646
} else {
1647
fprintf_plus(stderr, "Warning: network hook \"%s\""
1648
" crashed\n", direntry->d_name);
1649
free(fullname);
1650
continue;
1651
}
1652
}
1653
free(fullname);
1654
if(debug){
1655
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1656
direntry->d_name);
1657
}
1658
}
1659
close(devnull);
1660
}
1661
}
1662
1663
__attribute__((nonnull, warn_unused_result))
1664
error_t bring_up_interface(const char *const interface,
1665
const float delay){
1666
error_t old_errno = errno;
1667
int ret;
1668
struct ifreq network;
1669
unsigned int if_index = if_nametoindex(interface);
1670
if(if_index == 0){
1671
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1672
errno = old_errno;
1673
return ENXIO;
1674
}
1675
1676
if(quit_now){
1677
errno = old_errno;
1678
return EINTR;
1679
}
1680
1681
if(not interface_is_up(interface)){
1682
error_t ret_errno = 0, ioctl_errno = 0;
1683
if(not get_flags(interface, &network)){
1684
ret_errno = errno;
1685
fprintf_plus(stderr, "Failed to get flags for interface "
1686
"\"%s\"\n", interface);
1687
errno = old_errno;
1688
return ret_errno;
1689
}
1690
network.ifr_flags |= IFF_UP; /* set flag */
1691
1692
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1693
if(sd == -1){
1694
ret_errno = errno;
1695
perror_plus("socket");
1696
errno = old_errno;
1697
return ret_errno;
1698
}
1699
1700
if(quit_now){
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
errno = old_errno;
1706
return EINTR;
1707
}
1708
1709
if(debug){
1710
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1711
interface);
1712
}
1713
1714
/* Raise privileges */
1715
ret_errno = raise_privileges();
1716
bool restore_loglevel = false;
1717
if(ret_errno != 0){
1718
perror_plus("Failed to raise privileges");
1719
}
1720
#ifdef __linux__
1721
int ret_linux;
1722
if(ret_errno == 0){
1723
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1724
messages about the network interface to mess up the prompt */
1725
ret_linux = klogctl(8, NULL, 5);
1726
if(ret_linux == -1){
1727
perror_plus("klogctl");
1728
} else {
1729
restore_loglevel = true;
1730
}
1731
}
1732
#endif /* __linux__ */
1733
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1734
ioctl_errno = errno;
1735
#ifdef __linux__
1736
if(restore_loglevel){
1737
ret_linux = klogctl(7, NULL, 0);
1738
if(ret_linux == -1){
1739
perror_plus("klogctl");
1740
}
1741
}
1742
#endif /* __linux__ */
1743
1744
/* If raise_privileges() succeeded above */
1745
if(ret_errno == 0){
1746
/* Lower privileges */
1747
ret_errno = lower_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to lower privileges");
1751
}
1752
}
1753
1754
/* Close the socket */
1755
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1756
if(ret == -1){
1757
perror_plus("close");
1758
}
1759
1760
if(ret_setflags == -1){
1761
errno = ioctl_errno;
1762
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1763
errno = old_errno;
1764
return ioctl_errno;
1765
}
1766
} else if(debug){
1767
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1768
interface);
1769
}
1770
1771
/* Sleep checking until interface is running.
1772
Check every 0.25s, up to total time of delay */
1773
for(int i=0; i < delay * 4; i++){
1774
if(interface_is_running(interface)){
1775
break;
1776
}
1777
struct timespec sleeptime = { .tv_nsec = 250000000 };
1778
ret = nanosleep(&sleeptime, NULL);
1779
if(ret == -1 and errno != EINTR){
1780
perror_plus("nanosleep");
1781
}
1782
}
1783
1784
errno = old_errno;
1785
return 0;
1786
}
1787
1788
__attribute__((nonnull, warn_unused_result))
1789
error_t take_down_interface(const char *const interface){
1790
error_t old_errno = errno;
1791
struct ifreq network;
1792
unsigned int if_index = if_nametoindex(interface);
1793
if(if_index == 0){
1794
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1795
errno = old_errno;
1796
return ENXIO;
1797
}
1798
if(interface_is_up(interface)){
1799
error_t ret_errno = 0, ioctl_errno = 0;
1800
if(not get_flags(interface, &network) and debug){
1801
ret_errno = errno;
1802
fprintf_plus(stderr, "Failed to get flags for interface "
1803
"\"%s\"\n", interface);
1804
errno = old_errno;
1805
return ret_errno;
1806
}
1807
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1808
1809
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1810
if(sd == -1){
1811
ret_errno = errno;
1812
perror_plus("socket");
1813
errno = old_errno;
1814
return ret_errno;
1815
}
1816
1817
if(debug){
1818
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1819
interface);
1820
}
1821
1822
/* Raise privileges */
1823
ret_errno = raise_privileges();
1824
if(ret_errno != 0){
1825
perror_plus("Failed to raise privileges");
1826
}
1827
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1828
ioctl_errno = errno;
1829
1830
/* If raise_privileges() succeeded above */
1831
if(ret_errno == 0){
1832
/* Lower privileges */
1833
ret_errno = lower_privileges();
1834
if(ret_errno != 0){
1835
errno = ret_errno;
1836
perror_plus("Failed to lower privileges");
1837
}
1838
}
1839
1840
/* Close the socket */
1841
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1842
if(ret == -1){
1843
perror_plus("close");
1844
}
1845
1846
if(ret_setflags == -1){
1847
errno = ioctl_errno;
1848
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1849
errno = old_errno;
1850
return ioctl_errno;
1851
}
1852
} else if(debug){
1853
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1854
interface);
1855
}
1856
1857
errno = old_errno;
1858
return 0;
1859
}
1860
1861
1122
int main(int argc, char *argv[]){
1862
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1863
.priority = "SECURE256:!CTYPE-X.509:"
1864
"+CTYPE-OPENPGP", .current_server = NULL,
1865
.interfaces = NULL, .interfaces_size = 0 };
1866
1123
AvahiSServiceBrowser *sb = NULL;
1867
error_t ret_errno;
1124
int error;
1868
1125
int ret;
1869
1126
intmax_t tmpmax;
1870
1127
char *tmp;
1871
1128
int exitcode = EXIT_SUCCESS;
1872
char *interfaces_to_take_down = NULL;
1873
size_t interfaces_to_take_down_size = 0;
1129
const char *interface = "";
1130
struct ifreq network;
1131
int sd = -1;
1132
bool take_down_interface = false;
1133
uid_t uid;
1134
gid_t gid;
1874
1135
char tempdir[] = "/tmp/mandosXXXXXX";
1875
1136
bool tempdir_created = false;
1876
1137
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1877
1138
const char *seckey = PATHDIR "/" SECKEY;
1878
1139
const char *pubkey = PATHDIR "/" PUBKEY;
1879
char *interfaces_hooks = NULL;
1880
1140
1881
1141
bool gnutls_initialized = false;
1882
1142
bool gpgme_initialized = false;
1883
1143
float delay = 2.5f;
1884
double retry_interval = 10; /* 10s between trying a server and
1885
retrying the same server again */
1886
1144
1887
1145
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1888
1146
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1894
1152
errno = 0;
1895
1153
ret = setgid(gid);
1896
1154
if(ret == -1){
1897
perror_plus("setgid");
1155
perror("setgid");
1898
1156
}
1899
1157
1900
1158
/* Lower user privileges (temporarily) */
1901
1159
errno = 0;
1902
1160
ret = seteuid(uid);
1903
1161
if(ret == -1){
1904
perror_plus("seteuid");
1162
perror("seteuid");
1905
1163
}
1906
1164
1907
1165
if(quit_now){
1942
1200
.arg = "SECONDS",
1943
1201
.doc = "Maximum delay to wait for interface startup",
1944
1202
.group = 2 },
1945
{ .name = "retry", .key = 132,
1946
.arg = "SECONDS",
1947
.doc = "Retry interval used when denied by the Mandos server",
1948
.group = 2 },
1949
{ .name = "network-hook-dir", .key = 133,
1950
.arg = "DIR",
1951
.doc = "Directory where network hooks are located",
1952
.group = 2 },
1953
1203
/*
1954
1204
* These reproduce what we would get without ARGP_NO_HELP
1955
1205
*/
1973
1223
connect_to = arg;
1974
1224
break;
1975
1225
case 'i': /* --interface */
1976
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1977
arg, (int)',');
1978
if(ret_errno != 0){
1979
argp_error(state, "%s", strerror(ret_errno));
1980
}
1226
interface = arg;
1981
1227
break;
1982
1228
case 's': /* --seckey */
1983
1229
seckey = arg;
2003
1249
if(errno != 0 or tmp == arg or *tmp != '\0'){
2004
1250
argp_error(state, "Bad delay");
2005
1251
}
2006
case 132: /* --retry */
2007
errno = 0;
2008
retry_interval = strtod(arg, &tmp);
2009
if(errno != 0 or tmp == arg or *tmp != '\0'
2010
or (retry_interval * 1000) > INT_MAX
2011
or retry_interval < 0){
2012
argp_error(state, "Bad retry interval");
2013
}
2014
break;
2015
case 133: /* --network-hook-dir */
2016
hookdir = arg;
2017
1252
break;
2018
1253
/*
2019
1254
* These reproduce what we would get without ARGP_NO_HELP
2026
1261
argp_state_help(state, state->out_stream,
2027
1262
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2028
1263
case 'V': /* --version */
2029
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1264
fprintf(state->out_stream, "%s\n", argp_program_version);
2030
1265
exit(argp_err_exit_status);
2031
1266
break;
2032
1267
default:
2047
1282
case ENOMEM:
2048
1283
default:
2049
1284
errno = ret;
2050
perror_plus("argp_parse");
1285
perror("argp_parse");
2051
1286
exitcode = EX_OSERR;
2052
1287
goto end;
2053
1288
case EINVAL:
2055
1290
goto end;
2056
1291
}
2057
1292
}
2058
2059
{
2060
/* Work around Debian bug #633582:
2061
<http://bugs.debian.org/633582> */
2062
2063
/* Re-raise privileges */
2064
ret_errno = raise_privileges();
2065
if(ret_errno != 0){
2066
errno = ret_errno;
2067
perror_plus("Failed to raise privileges");
2068
} else {
2069
struct stat st;
2070
2071
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2072
int seckey_fd = open(seckey, O_RDONLY);
2073
if(seckey_fd == -1){
2074
perror_plus("open");
2075
} else {
2076
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2077
if(ret == -1){
2078
perror_plus("fstat");
2079
} else {
2080
if(S_ISREG(st.st_mode)
2081
and st.st_uid == 0 and st.st_gid == 0){
2082
ret = fchown(seckey_fd, uid, gid);
2083
if(ret == -1){
2084
perror_plus("fchown");
2085
}
2086
}
2087
}
2088
TEMP_FAILURE_RETRY(close(seckey_fd));
2089
}
2090
}
2091
2092
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2093
int pubkey_fd = open(pubkey, O_RDONLY);
2094
if(pubkey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_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(pubkey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(pubkey_fd));
2110
}
2111
}
2112
2113
/* Lower privileges */
2114
ret_errno = lower_privileges();
2115
if(ret_errno != 0){
2116
errno = ret_errno;
2117
perror_plus("Failed to lower privileges");
2118
}
2119
}
2120
}
2121
2122
/* Remove invalid interface names (except "none") */
2123
{
2124
char *interface = NULL;
2125
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2126
interface))){
2127
if(strcmp(interface, "none") != 0
2128
and if_nametoindex(interface) == 0){
2129
if(interface[0] != '\0'){
2130
fprintf_plus(stderr, "Not using nonexisting interface"
2131
" \"%s\"\n", interface);
2132
}
2133
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2134
interface = NULL;
2135
}
2136
}
2137
}
2138
2139
/* Run network hooks */
2140
{
2141
if(mc.interfaces != NULL){
2142
interfaces_hooks = malloc(mc.interfaces_size);
2143
if(interfaces_hooks == NULL){
2144
perror_plus("malloc");
2145
goto end;
2146
}
2147
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2148
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2149
}
2150
run_network_hooks("start", interfaces_hooks != NULL ?
2151
interfaces_hooks : "", delay);
2152
}
2153
1293
2154
1294
if(not debug){
2155
1295
avahi_set_log_function(empty_log);
2156
1296
}
1297
1298
if(interface[0] == '\0'){
1299
struct dirent **direntries;
1300
ret = scandir(sys_class_net, &direntries, good_interface,
1301
alphasort);
1302
if(ret >= 1){
1303
/* Pick the first good interface */
1304
interface = strdup(direntries[0]->d_name);
1305
if(debug){
1306
fprintf(stderr, "Using interface \"%s\"\n", interface);
1307
}
1308
if(interface == NULL){
1309
perror("malloc");
1310
free(direntries);
1311
exitcode = EXIT_FAILURE;
1312
goto end;
1313
}
1314
free(direntries);
1315
} else {
1316
free(direntries);
1317
fprintf(stderr, "Could not find a network interface\n");
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
}
2157
1322
2158
1323
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2159
1324
from the signal handler */
2160
1325
/* Initialize the pseudo-RNG for Avahi */
2161
1326
srand((unsigned int) time(NULL));
2162
simple_poll = avahi_simple_poll_new();
2163
if(simple_poll == NULL){
2164
fprintf_plus(stderr,
2165
"Avahi: Failed to create simple poll object.\n");
1327
mc.simple_poll = avahi_simple_poll_new();
1328
if(mc.simple_poll == NULL){
1329
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2166
1330
exitcode = EX_UNAVAILABLE;
2167
1331
goto end;
2168
1332
}
2170
1334
sigemptyset(&sigterm_action.sa_mask);
2171
1335
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2172
1336
if(ret == -1){
2173
perror_plus("sigaddset");
1337
perror("sigaddset");
2174
1338
exitcode = EX_OSERR;
2175
1339
goto end;
2176
1340
}
2177
1341
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2178
1342
if(ret == -1){
2179
perror_plus("sigaddset");
1343
perror("sigaddset");
2180
1344
exitcode = EX_OSERR;
2181
1345
goto end;
2182
1346
}
2183
1347
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2184
1348
if(ret == -1){
2185
perror_plus("sigaddset");
1349
perror("sigaddset");
2186
1350
exitcode = EX_OSERR;
2187
1351
goto end;
2188
1352
}
2192
1356
*/
2193
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2194
1358
if(ret == -1){
2195
perror_plus("sigaction");
1359
perror("sigaction");
2196
1360
return EX_OSERR;
2197
1361
}
2198
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
2199
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
2200
1364
if(ret == -1){
2201
perror_plus("sigaction");
1365
perror("sigaction");
2202
1366
exitcode = EX_OSERR;
2203
1367
goto end;
2204
1368
}
2205
1369
}
2206
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2207
1371
if(ret == -1){
2208
perror_plus("sigaction");
1372
perror("sigaction");
2209
1373
return EX_OSERR;
2210
1374
}
2211
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
2212
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2213
1377
if(ret == -1){
2214
perror_plus("sigaction");
1378
perror("sigaction");
2215
1379
exitcode = EX_OSERR;
2216
1380
goto end;
2217
1381
}
2218
1382
}
2219
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2220
1384
if(ret == -1){
2221
perror_plus("sigaction");
1385
perror("sigaction");
2222
1386
return EX_OSERR;
2223
1387
}
2224
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
2225
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2226
1390
if(ret == -1){
2227
perror_plus("sigaction");
1391
perror("sigaction");
2228
1392
exitcode = EX_OSERR;
2229
1393
goto end;
2230
1394
}
2231
1395
}
2232
1396
2233
/* If no interfaces were specified, make a list */
2234
if(mc.interfaces == NULL){
2235
struct dirent **direntries;
2236
/* Look for any good interfaces */
2237
ret = scandir(sys_class_net, &direntries, good_interface,
2238
alphasort);
2239
if(ret >= 1){
2240
/* Add all found interfaces to interfaces list */
2241
for(int i = 0; i < ret; ++i){
2242
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2243
direntries[i]->d_name);
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("argz_add");
2247
continue;
2248
}
2249
if(debug){
2250
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2251
direntries[i]->d_name);
2252
}
2253
}
2254
free(direntries);
1397
/* If the interface is down, bring it up */
1398
if(strcmp(interface, "none") != 0){
1399
if_index = (AvahiIfIndex) if_nametoindex(interface);
1400
if(if_index == 0){
1401
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1402
exitcode = EX_UNAVAILABLE;
1403
goto end;
1404
}
1405
1406
if(quit_now){
1407
goto end;
1408
}
1409
1410
/* Re-raise priviliges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror("seteuid");
1415
}
1416
1417
#ifdef __linux__
1418
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1419
messages about the network interface to mess up the prompt */
1420
ret = klogctl(8, NULL, 5);
1421
bool restore_loglevel = true;
1422
if(ret == -1){
1423
restore_loglevel = false;
1424
perror("klogctl");
1425
}
1426
#endif /* __linux__ */
1427
1428
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1429
if(sd < 0){
1430
perror("socket");
1431
exitcode = EX_OSERR;
1432
#ifdef __linux__
1433
if(restore_loglevel){
1434
ret = klogctl(7, NULL, 0);
1435
if(ret == -1){
1436
perror("klogctl");
1437
}
1438
}
1439
#endif /* __linux__ */
1440
/* Lower privileges */
1441
errno = 0;
1442
ret = seteuid(uid);
1443
if(ret == -1){
1444
perror("seteuid");
1445
}
1446
goto end;
1447
}
1448
strcpy(network.ifr_name, interface);
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1450
if(ret == -1){
1451
perror("ioctl SIOCGIFFLAGS");
1452
#ifdef __linux__
1453
if(restore_loglevel){
1454
ret = klogctl(7, NULL, 0);
1455
if(ret == -1){
1456
perror("klogctl");
1457
}
1458
}
1459
#endif /* __linux__ */
1460
exitcode = EX_OSERR;
1461
/* Lower privileges */
1462
errno = 0;
1463
ret = seteuid(uid);
1464
if(ret == -1){
1465
perror("seteuid");
1466
}
1467
goto end;
1468
}
1469
if((network.ifr_flags & IFF_UP) == 0){
1470
network.ifr_flags |= IFF_UP;
1471
take_down_interface = true;
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1473
if(ret == -1){
1474
take_down_interface = false;
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1476
exitcode = EX_OSERR;
1477
#ifdef __linux__
1478
if(restore_loglevel){
1479
ret = klogctl(7, NULL, 0);
1480
if(ret == -1){
1481
perror("klogctl");
1482
}
1483
}
1484
#endif /* __linux__ */
1485
/* Lower privileges */
1486
errno = 0;
1487
ret = seteuid(uid);
1488
if(ret == -1){
1489
perror("seteuid");
1490
}
1491
goto end;
1492
}
1493
}
1494
/* sleep checking until interface is running */
1495
for(int i=0; i < delay * 4; i++){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_RUNNING){
1500
break;
1501
}
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1503
ret = nanosleep(&sleeptime, NULL);
1504
if(ret == -1 and errno != EINTR){
1505
perror("nanosleep");
1506
}
1507
}
1508
if(not take_down_interface){
1509
/* We won't need the socket anymore */
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1511
if(ret == -1){
1512
perror("close");
1513
}
1514
}
1515
#ifdef __linux__
1516
if(restore_loglevel){
1517
/* Restores kernel loglevel to default */
1518
ret = klogctl(7, NULL, 0);
1519
if(ret == -1){
1520
perror("klogctl");
1521
}
1522
}
1523
#endif /* __linux__ */
1524
/* Lower privileges */
1525
errno = 0;
1526
if(take_down_interface){
1527
/* Lower privileges */
1528
ret = seteuid(uid);
1529
if(ret == -1){
1530
perror("seteuid");
1531
}
2255
1532
} else {
2256
free(direntries);
2257
fprintf_plus(stderr, "Could not find a network interface\n");
2258
exitcode = EXIT_FAILURE;
2259
goto end;
2260
}
2261
}
2262
2263
/* Bring up interfaces which are down, and remove any "none"s */
2264
{
2265
char *interface = NULL;
2266
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2267
interface))){
2268
/* If interface name is "none", stop bringing up interfaces.
2269
Also remove all instances of "none" from the list */
2270
if(strcmp(interface, "none") == 0){
2271
argz_delete(&mc.interfaces, &mc.interfaces_size,
2272
interface);
2273
interface = NULL;
2274
while((interface = argz_next(mc.interfaces,
2275
mc.interfaces_size, interface))){
2276
if(strcmp(interface, "none") == 0){
2277
argz_delete(&mc.interfaces, &mc.interfaces_size,
2278
interface);
2279
interface = NULL;
2280
}
2281
}
2282
break;
2283
}
2284
bool interface_was_up = interface_is_up(interface);
2285
errno = bring_up_interface(interface, delay);
2286
if(not interface_was_up){
2287
if(errno != 0){
2288
perror_plus("Failed to bring up interface");
2289
} else {
2290
errno = argz_add(&interfaces_to_take_down,
2291
&interfaces_to_take_down_size,
2292
interface);
2293
if(errno != 0){
2294
perror_plus("argz_add");
2295
}
2296
}
2297
}
2298
}
2299
if(debug and (interfaces_to_take_down == NULL)){
2300
fprintf_plus(stderr, "No interfaces were brought up\n");
2301
}
2302
}
2303
2304
/* If we only got one interface, explicitly use only that one */
2305
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2306
if(debug){
2307
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2308
mc.interfaces);
2309
}
2310
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1533
/* Lower privileges permanently */
1534
ret = setuid(uid);
1535
if(ret == -1){
1536
perror("setuid");
1537
}
1538
}
2311
1539
}
2312
1540
2313
1541
if(quit_now){
2314
1542
goto end;
2315
1543
}
2316
1544
2317
ret = init_gnutls_global(pubkey, seckey, &mc);
1545
ret = init_gnutls_global(pubkey, seckey);
2318
1546
if(ret == -1){
2319
fprintf_plus(stderr, "init_gnutls_global failed\n");
1547
fprintf(stderr, "init_gnutls_global failed\n");
2320
1548
exitcode = EX_UNAVAILABLE;
2321
1549
goto end;
2322
1550
} else {
2327
1555
goto end;
2328
1556
}
2329
1557
1558
tempdir_created = true;
2330
1559
if(mkdtemp(tempdir) == NULL){
2331
perror_plus("mkdtemp");
1560
tempdir_created = false;
1561
perror("mkdtemp");
2332
1562
goto end;
2333
1563
}
2334
tempdir_created = true;
2335
1564
2336
1565
if(quit_now){
2337
1566
goto end;
2338
1567
}
2339
1568
2340
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2341
fprintf_plus(stderr, "init_gpgme failed\n");
1569
if(not init_gpgme(pubkey, seckey, tempdir)){
1570
fprintf(stderr, "init_gpgme failed\n");
2342
1571
exitcode = EX_UNAVAILABLE;
2343
1572
goto end;
2344
1573
} else {
2353
1582
/* Connect directly, do not use Zeroconf */
2354
1583
/* (Mainly meant for debugging) */
2355
1584
char *address = strrchr(connect_to, ':');
2356
2357
1585
if(address == NULL){
2358
fprintf_plus(stderr, "No colon in address\n");
1586
fprintf(stderr, "No colon in address\n");
2359
1587
exitcode = EX_USAGE;
2360
1588
goto end;
2361
1589
}
2364
1592
goto end;
2365
1593
}
2366
1594
2367
in_port_t port;
1595
uint16_t port;
2368
1596
errno = 0;
2369
1597
tmpmax = strtoimax(address+1, &tmp, 10);
2370
1598
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2371
or tmpmax != (in_port_t)tmpmax){
2372
fprintf_plus(stderr, "Bad port number\n");
1599
or tmpmax != (uint16_t)tmpmax){
1600
fprintf(stderr, "Bad port number\n");
2373
1601
exitcode = EX_USAGE;
2374
1602
goto end;
2375
1603
}
2376
1604
2377
1605
if(quit_now){
2378
1606
goto end;
2379
1607
}
2380
1608
2381
port = (in_port_t)tmpmax;
1609
port = (uint16_t)tmpmax;
2382
1610
*address = '\0';
1611
address = connect_to;
2383
1612
/* Colon in address indicates IPv6 */
2384
1613
int af;
2385
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
2386
1615
af = AF_INET6;
2387
/* Accept [] around IPv6 address - see RFC 5952 */
2388
if(connect_to[0] == '[' and address[-1] == ']')
2389
{
2390
connect_to++;
2391
address[-1] = '\0';
2392
}
2393
1616
} else {
2394
1617
af = AF_INET;
2395
1618
}
2396
address = connect_to;
2397
1619
2398
1620
if(quit_now){
2399
1621
goto end;
2400
1622
}
2401
1623
2402
1624
while(not quit_now){
2403
ret = start_mandos_communication(address, port, if_index, af,
2404
&mc);
1625
ret = start_mandos_communication(address, port, if_index, af);
2405
1626
if(quit_now or ret == 0){
2406
1627
break;
2407
1628
}
2408
if(debug){
2409
fprintf_plus(stderr, "Retrying in %d seconds\n",
2410
(int)retry_interval);
2411
}
2412
sleep((unsigned int)retry_interval);
2413
}
2414
2415
if(not quit_now){
1629
sleep(15);
1630
};
1631
1632
if (not quit_now){
2416
1633
exitcode = EXIT_SUCCESS;
2417
1634
}
2418
1635
2419
1636
goto end;
2420
1637
}
2421
1638
2433
1650
config.publish_domain = 0;
2434
1651
2435
1652
/* Allocate a new server */
2436
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2437
&config, NULL, NULL, &ret_errno);
1653
mc.server = avahi_server_new(avahi_simple_poll_get
1654
(mc.simple_poll), &config, NULL,
1655
NULL, &error);
2438
1656
2439
1657
/* Free the Avahi configuration data */
2440
1658
avahi_server_config_free(&config);
2442
1660
2443
1661
/* Check if creating the Avahi server object succeeded */
2444
1662
if(mc.server == NULL){
2445
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2446
avahi_strerror(ret_errno));
1663
fprintf(stderr, "Failed to create Avahi server: %s\n",
1664
avahi_strerror(error));
2447
1665
exitcode = EX_UNAVAILABLE;
2448
1666
goto end;
2449
1667
}
2455
1673
/* Create the Avahi service browser */
2456
1674
sb = avahi_s_service_browser_new(mc.server, if_index,
2457
1675
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2458
NULL, 0, browse_callback,
2459
(void *)&mc);
1676
NULL, 0, browse_callback, NULL);
2460
1677
if(sb == NULL){
2461
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2462
avahi_strerror(avahi_server_errno(mc.server)));
1678
fprintf(stderr, "Failed to create service browser: %s\n",
1679
avahi_strerror(avahi_server_errno(mc.server)));
2463
1680
exitcode = EX_UNAVAILABLE;
2464
1681
goto end;
2465
1682
}
2471
1688
/* Run the main loop */
2472
1689
2473
1690
if(debug){
2474
fprintf_plus(stderr, "Starting Avahi loop search\n");
2475
}
2476
2477
ret = avahi_loop_with_timeout(simple_poll,
2478
(int)(retry_interval * 1000), &mc);
2479
if(debug){
2480
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2481
(ret == 0) ? "successfully" : "with error");
2482
}
1691
fprintf(stderr, "Starting Avahi loop search\n");
1692
}
1693
1694
avahi_simple_poll_loop(mc.simple_poll);
2483
1695
2484
1696
end:
2485
1697
2486
1698
if(debug){
2487
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1699
fprintf(stderr, "%s exiting\n", argv[0]);
2488
1700
}
2489
1701
2490
1702
/* Cleanup things */
2491
free(mc.interfaces);
2492
2493
1703
if(sb != NULL)
2494
1704
avahi_s_service_browser_free(sb);
2495
1705
2496
1706
if(mc.server != NULL)
2497
1707
avahi_server_free(mc.server);
2498
1708
2499
if(simple_poll != NULL)
2500
avahi_simple_poll_free(simple_poll);
1709
if(mc.simple_poll != NULL)
1710
avahi_simple_poll_free(mc.simple_poll);
2501
1711
2502
1712
if(gnutls_initialized){
2503
1713
gnutls_certificate_free_credentials(mc.cred);
2509
1719
gpgme_release(mc.ctx);
2510
1720
}
2511
1721
2512
/* Cleans up the circular linked list of Mandos servers the client
2513
has seen */
2514
if(mc.current_server != NULL){
2515
mc.current_server->prev->next = NULL;
2516
while(mc.current_server != NULL){
2517
server *next = mc.current_server->next;
2518
free(mc.current_server);
2519
mc.current_server = next;
2520
}
2521
}
2522
2523
/* Re-raise privileges */
2524
{
2525
ret_errno = raise_privileges();
2526
if(ret_errno != 0){
2527
perror_plus("Failed to raise privileges");
2528
} else {
2529
2530
/* Run network hooks */
2531
run_network_hooks("stop", interfaces_hooks != NULL ?
2532
interfaces_hooks : "", delay);
2533
2534
/* Take down the network interfaces which were brought up */
2535
{
2536
char *interface = NULL;
2537
while((interface=argz_next(interfaces_to_take_down,
2538
interfaces_to_take_down_size,
2539
interface))){
2540
ret_errno = take_down_interface(interface);
2541
if(ret_errno != 0){
2542
errno = ret_errno;
2543
perror_plus("Failed to take down interface");
2544
}
2545
}
2546
if(debug and (interfaces_to_take_down == NULL)){
2547
fprintf_plus(stderr, "No interfaces needed to be taken"
2548
" down\n");
2549
}
2550
}
2551
}
2552
ret_errno = lower_privileges_permanently();
2553
if(ret_errno != 0){
2554
perror_plus("Failed to lower privileges permanently");
2555
}
2556
}
2557
2558
free(interfaces_to_take_down);
2559
free(interfaces_hooks);
2560
2561
/* Removes the GPGME temp directory and all files inside */
1722
/* Take down the network interface */
1723
if(take_down_interface){
1724
/* Re-raise priviliges */
1725
errno = 0;
1726
ret = seteuid(0);
1727
if(ret == -1){
1728
perror("seteuid");
1729
}
1730
if(geteuid() == 0){
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1732
if(ret == -1){
1733
perror("ioctl SIOCGIFFLAGS");
1734
} else if(network.ifr_flags & IFF_UP) {
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1737
if(ret == -1){
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1739
}
1740
}
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1742
if(ret == -1){
1743
perror("close");
1744
}
1745
/* Lower privileges permanently */
1746
errno = 0;
1747
ret = setuid(uid);
1748
if(ret == -1){
1749
perror("setuid");
1750
}
1751
}
1752
}
1753
1754
/* Removes the temp directory used by GPGME */
2562
1755
if(tempdir_created){
2563
struct dirent **direntries = NULL;
2564
struct dirent *direntry = NULL;
2565
int numentries = scandir(tempdir, &direntries, notdotentries,
2566
alphasort);
2567
if(numentries > 0){
2568
for(int i = 0; i < numentries; i++){
2569
direntry = direntries[i];
1756
DIR *d;
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1759
if(d == NULL){
1760
if(errno != ENOENT){
1761
perror("opendir");
1762
}
1763
} else {
1764
while(true){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1767
break;
1768
}
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
1774
continue;
1775
}
2570
1776
char *fullname = NULL;
2571
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2572
1778
direntry->d_name);
2573
1779
if(ret < 0){
2574
perror_plus("asprintf");
1780
perror("asprintf");
2575
1781
continue;
2576
1782
}
2577
1783
ret = remove(fullname);
2578
1784
if(ret == -1){
2579
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2580
strerror(errno));
1785
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1786
strerror(errno));
2581
1787
}
2582
1788
free(fullname);
2583
1789
}
2584
}
2585
2586
/* need to clean even if 0 because man page doesn't specify */
2587
free(direntries);
2588
if(numentries == -1){
2589
perror_plus("scandir");
1790
closedir(d);
2590
1791
}
2591
1792
ret = rmdir(tempdir);
2592
1793
if(ret == -1 and errno != ENOENT){
2593
perror_plus("rmdir");
1794
perror("rmdir");
2594
1795
}
2595
1796
}
2596
1797
2601
1802
&old_sigterm_action,
2602
1803
NULL));
2603
1804
if(ret == -1){
2604
perror_plus("sigaction");
1805
perror("sigaction");
2605
1806
}
2606
1807
do {
2607
1808
ret = raise(signal_received);
2608
1809
} while(ret != 0 and errno == EINTR);
2609
1810
if(ret != 0){
2610
perror_plus("raise");
1811
perror("raise");
2611
1812
abort();
2612
1813
}
2613
1814
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0