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- Committer: Teddy Hogeborn
- Date: 2011-07-16 00:29:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20110716002919-r77yikuiulj42o40
* initramfs-tools-script: Abort if plugin-runner is missing. Removed
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
- files removed:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
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() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
88
98
89
#ifdef __linux__
99
90
#include <sys/klog.h> /* klogctl() */
117
108
init_gnutls_session(),
118
109
GNUTLS_* */
119
110
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
122
113
123
114
/* GPGME */
124
115
#include <gpgme.h> /* All GPGME types, constants and
132
123
#define PATHDIR "/conf/conf.d/mandos"
133
124
#define SECKEY "seckey.txt"
134
125
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
126
137
127
bool debug = false;
138
128
static const char mandos_protocol_version[] = "1";
139
129
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
131
static const char sys_class_net[] = "/sys/class/net";
142
132
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
133
148
134
/* Doubly linked list that need to be circularly linked when used */
149
135
typedef struct server{
150
136
const char *ip;
151
in_port_t port;
137
uint16_t port;
152
138
AvahiIfIndex if_index;
153
139
int af;
154
140
struct timespec last_seen;
158
144
159
145
/* Used for passing in values through the Avahi callback functions */
160
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
161
148
AvahiServer *server;
162
149
gnutls_certificate_credentials_t cred;
163
150
unsigned int dh_bits;
165
152
const char *priority;
166
153
gpgme_ctx_t ctx;
167
154
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
170
155
} mandos_context;
171
156
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
174
162
175
163
sig_atomic_t quit_now = 0;
176
164
int signal_received = 0;
177
165
178
166
/* Function to use when printing errors */
179
167
void perror_plus(const char *print_text){
180
int e = errno;
181
168
fprintf(stderr, "Mandos plugin %s: ",
182
169
program_invocation_short_name);
183
errno = e;
184
170
perror(print_text);
185
171
}
186
172
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
196
197
173
/*
198
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
175
* bytes. "buffer_capacity" is how much is currently allocated,
200
176
* "buffer_length" is how much is already used.
201
177
*/
202
__attribute__((nonnull, warn_unused_result))
203
178
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
179
size_t buffer_capacity){
205
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
212
183
return 0;
213
184
}
214
*buffer = new_buf;
215
185
buffer_capacity += BUFFER_SIZE;
216
186
}
217
187
return buffer_capacity;
218
188
}
219
189
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
224
193
int ret;
225
194
server *new_server = malloc(sizeof(server));
226
195
if(new_server == NULL){
227
196
perror_plus("malloc");
228
return false;
197
return -1;
229
198
}
230
199
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
234
203
if(new_server->ip == NULL){
235
204
perror_plus("strdup");
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
245
209
new_server->next = new_server;
246
210
new_server->prev = new_server;
247
*current_server = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
248
213
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
252
216
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
256
225
}
257
226
258
227
/*
259
228
* Initialize GPGME.
260
229
*/
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
266
232
gpgme_error_t rc;
267
233
gpgme_engine_info_t engine_info;
268
234
235
269
236
/*
270
237
* Helper function to insert pub and seckey to the engine keyring.
271
238
*/
272
bool import_key(const char * const filename){
239
bool import_key(const char *filename){
273
240
int ret;
274
241
int fd;
275
242
gpgme_data_t pgp_data;
282
249
283
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
251
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
287
254
return false;
288
255
}
289
256
290
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
291
258
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
294
261
return false;
295
262
}
296
263
303
270
}
304
271
305
272
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
307
274
}
308
275
309
276
/* Init GPGME */
310
277
gpgme_check_version(NULL);
311
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
312
279
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
315
282
return false;
316
283
}
317
284
318
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
319
286
rc = gpgme_get_engine_info(&engine_info);
320
287
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
323
290
return false;
324
291
}
325
292
while(engine_info != NULL){
331
298
engine_info = engine_info->next;
332
299
}
333
300
if(engine_info == NULL){
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
336
302
return false;
337
303
}
338
304
339
305
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
341
307
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
345
310
return false;
346
311
}
347
312
356
321
* Decrypt OpenPGP data.
357
322
* Returns -1 on error
358
323
*/
359
__attribute__((nonnull, warn_unused_result))
360
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
325
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
326
char **plaintext){
364
327
gpgme_data_t dh_crypto, dh_plain;
365
328
gpgme_error_t rc;
366
329
ssize_t ret;
368
331
ssize_t plaintext_length = 0;
369
332
370
333
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
372
335
}
373
336
374
337
/* Create new GPGME data buffer from memory cryptotext */
375
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
376
339
0);
377
340
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
380
343
return -1;
381
344
}
382
345
383
346
/* Create new empty GPGME data buffer for the plaintext */
384
347
rc = gpgme_data_new(&dh_plain);
385
348
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
389
351
gpgme_data_release(dh_crypto);
390
352
return -1;
391
353
}
392
354
393
355
/* Decrypt data from the cryptotext data buffer to the plaintext
394
356
data buffer */
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
358
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
399
361
plaintext_length = -1;
400
362
if(debug){
401
363
gpgme_decrypt_result_t result;
402
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
403
365
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
405
367
} else {
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
410
372
if(result->file_name != NULL){
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
412
374
}
413
375
gpgme_recipient_t recipient;
414
376
recipient = result->recipients;
415
377
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
423
384
recipient = recipient->next;
424
385
}
425
386
}
428
389
}
429
390
430
391
if(debug){
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
393
}
433
394
434
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
441
402
*plaintext = NULL;
442
403
while(true){
443
404
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
446
407
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
450
411
}
451
412
452
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
426
}
466
427
467
428
if(debug){
468
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
469
430
for(ssize_t i = 0; i < plaintext_length; i++){
470
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
471
432
}
482
443
return plaintext_length;
483
444
}
484
445
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
488
449
if(ret == NULL)
489
450
ret = "(unknown)";
490
451
return ret;
491
452
}
492
453
493
454
/* GnuTLS log function callback */
494
__attribute__((nonnull))
495
455
static void debuggnutls(__attribute__((unused)) int level,
496
456
const char* string){
497
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
498
458
}
499
459
500
__attribute__((nonnull, warn_unused_result))
501
460
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
461
const char *seckeyfilename){
504
462
int ret;
505
463
506
464
if(debug){
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
508
466
}
509
467
510
468
ret = gnutls_global_init();
511
469
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
514
472
return -1;
515
473
}
516
474
523
481
}
524
482
525
483
/* OpenPGP credentials */
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
485
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
530
488
gnutls_global_deinit();
531
489
return -1;
532
490
}
533
491
534
492
if(debug){
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
539
496
}
540
497
541
498
ret = gnutls_certificate_set_openpgp_key_file
542
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
543
500
GNUTLS_OPENPGP_FMT_BASE64);
544
501
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
550
507
goto globalfail;
551
508
}
552
509
553
510
/* GnuTLS server initialization */
554
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
555
512
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
559
515
goto globalfail;
560
516
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
518
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
565
521
goto globalfail;
566
522
}
567
523
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
525
570
526
return 0;
571
527
572
528
globalfail:
573
529
574
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
575
531
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
577
533
return -1;
578
534
}
579
535
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
583
537
int ret;
584
538
/* GnuTLS session creation */
585
539
do {
589
543
}
590
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
591
545
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
595
548
}
596
549
597
550
{
598
551
const char *err;
599
552
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
554
if(quit_now){
602
555
gnutls_deinit(*session);
603
556
return -1;
604
557
}
605
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
559
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
610
563
gnutls_deinit(*session);
611
564
return -1;
612
565
}
614
567
615
568
do {
616
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
570
mc.cred);
618
571
if(quit_now){
619
572
gnutls_deinit(*session);
620
573
return -1;
621
574
}
622
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
623
576
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
626
579
gnutls_deinit(*session);
627
580
return -1;
628
581
}
630
583
/* ignore client certificate if any. */
631
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
632
585
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
587
635
588
return 0;
636
589
}
640
593
__attribute__((unused)) const char *txt){}
641
594
642
595
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
645
597
AvahiIfIndex if_index,
646
int af, mandos_context *mc){
598
int af){
647
599
int ret, tcp_sd = -1;
648
600
ssize_t sret;
649
struct sockaddr_storage to;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
650
605
char *buffer = NULL;
651
606
char *decrypted_buffer = NULL;
652
607
size_t buffer_length = 0;
671
626
pf = PF_INET;
672
627
break;
673
628
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
675
630
errno = EINVAL;
676
631
return -1;
677
632
}
678
633
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
707
return -1;
708
}
709
}
710
711
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
712
635
if(ret != 0){
713
636
return -1;
714
637
}
715
638
716
639
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
719
642
}
720
643
721
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
733
656
734
657
memset(&to, 0, sizeof(to));
735
658
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
738
661
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
741
664
}
742
665
if(ret < 0 ){
743
666
int e = errno;
747
670
}
748
671
if(ret == 0){
749
672
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
751
674
errno = e;
752
675
goto mandos_end;
753
676
}
754
677
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
758
685
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
761
688
errno = EINVAL;
762
689
goto mandos_end;
763
690
}
764
691
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
692
to.in6.sin6_scope_id = (uint32_t)if_index;
766
693
}
767
694
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
769
698
}
770
699
771
700
if(quit_now){
779
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
709
perror_plus("if_indextoname");
781
710
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
784
713
}
785
714
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
788
717
}
789
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
791
721
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
796
724
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
801
727
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
730
} else {
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
733
}
808
734
}
809
735
}
810
736
814
740
}
815
741
816
742
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
744
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
822
746
}
823
747
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
749
int e = errno;
826
750
perror_plus("connect");
827
751
errno = e;
839
763
while(true){
840
764
size_t out_size = strlen(out);
841
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
766
out_size - written));
843
767
if(ret == -1){
844
768
int e = errno;
845
769
perror_plus("write");
865
789
}
866
790
867
791
if(debug){
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
869
793
}
870
794
871
795
if(quit_now){
873
797
goto mandos_end;
874
798
}
875
799
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
881
802
882
803
if(quit_now){
883
804
errno = EINTR;
894
815
895
816
if(ret != GNUTLS_E_SUCCESS){
896
817
if(debug){
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
898
819
gnutls_perror(ret);
899
820
}
900
821
errno = EPROTO;
904
825
/* Read OpenPGP packet that contains the wanted password */
905
826
906
827
if(debug){
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
909
830
}
910
831
911
832
while(true){
916
837
}
917
838
918
839
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
840
buffer_capacity);
920
841
if(buffer_capacity == 0){
921
842
int e = errno;
922
843
perror_plus("incbuffer");
949
870
}
950
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
872
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
954
874
gnutls_perror(ret);
955
875
errno = EPROTO;
956
876
goto mandos_end;
957
877
}
958
878
break;
959
879
default:
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
962
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
883
errno = EIO;
964
884
goto mandos_end;
969
889
}
970
890
971
891
if(debug){
972
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
973
893
}
974
894
975
895
if(quit_now){
987
907
988
908
if(buffer_length > 0){
989
909
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
992
913
if(decrypted_buffer_size >= 0){
993
914
994
915
written = 0;
1004
925
if(ret == 0 and ferror(stdout)){
1005
926
int e = errno;
1006
927
if(debug){
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
1009
930
}
1010
931
errno = e;
1011
932
goto mandos_end;
1042
963
return retval;
1043
964
}
1044
965
1045
__attribute__((nonnull))
1046
966
static void resolve_callback(AvahiSServiceResolver *r,
1047
967
AvahiIfIndex interface,
1048
968
AvahiProtocol proto,
1056
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1057
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
978
flags,
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1063
981
1064
982
/* Called whenever a service has been resolved successfully or
1065
983
timed out */
1071
989
switch(event){
1072
990
default:
1073
991
case AVAHI_RESOLVER_FAILURE:
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1079
995
break;
1080
996
1081
997
case AVAHI_RESOLVER_FOUND:
1083
999
char ip[AVAHI_ADDRESS_STR_MAX];
1084
1000
avahi_address_snprint(ip, sizeof(ip), address);
1085
1001
if(debug){
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1089
1005
}
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1094
1008
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1096
1010
} else {
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1103
1013
}
1104
1014
}
1105
1015
}
1115
1025
const char *domain,
1116
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
1027
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1122
1030
1123
1031
/* Called whenever a new services becomes available on the LAN or
1124
1032
is removed from the LAN */
1131
1039
default:
1132
1040
case AVAHI_BROWSER_FAILURE:
1133
1041
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1138
1045
return;
1139
1046
1140
1047
case AVAHI_BROWSER_NEW:
1143
1050
the callback function is called the Avahi server will free the
1144
1051
resolver for us. */
1145
1052
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1154
1058
break;
1155
1059
1156
1060
case AVAHI_BROWSER_REMOVE:
1159
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1160
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1161
1065
if(debug){
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1164
1067
}
1165
1068
break;
1166
1069
}
1175
1078
signal_received = sig;
1176
1079
int old_errno = errno;
1177
1080
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1180
1083
}
1181
1084
errno = old_errno;
1182
1085
}
1183
1086
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1199
1143
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1203
1146
}
1204
return false;
1147
free(flagstring);
1148
return 0;
1205
1149
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1212
1152
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1214
1154
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1217
1157
}
1218
return false;
1158
return 0;
1219
1159
}
1220
1160
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1222
1162
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1225
1165
}
1226
return true;
1166
return 1;
1227
1167
}
1228
1168
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1230
1170
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1233
1173
}
1234
return false;
1174
return 0;
1235
1175
}
1236
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1238
1178
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1241
1181
}
1242
return false;
1182
return 0;
1243
1183
}
1244
1245
1184
/* Accept this device */
1246
1185
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1252
/*
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1260
return 0;
1261
}
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1274
1188
}
1275
1189
return 1;
1276
1190
}
1277
1191
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
1192
int notdotentries(const struct dirent *direntry){
1314
1193
/* Skip "." and ".." */
1315
1194
if(direntry->d_name[0] == '.'
1321
1200
return 1;
1322
1201
}
1323
1202
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1357
if(ret == -1){
1358
if(debug){
1359
perror_plus("Could not stat hook");
1360
}
1361
return 0;
1362
}
1363
free(fullname);
1364
if(not (S_ISREG(st.st_mode))){
1365
/* Not a regular file */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1373
/* Not executable */
1374
if(debug){
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1376
direntry->d_name);
1377
}
1378
return 0;
1379
}
1380
if(debug){
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1382
direntry->d_name);
1383
}
1384
return 1;
1385
}
1386
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1390
1204
int ret;
1391
1205
struct timespec now;
1392
1206
struct timespec waited_time;
1393
1207
intmax_t block_time;
1394
1208
1395
1209
while(true){
1396
if(mc->current_server == NULL){
1397
if(debug){
1398
fprintf_plus(stderr, "Wait until first server is found."
1399
" No timeout!\n");
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1400
1214
}
1401
1215
ret = avahi_simple_poll_iterate(s, -1);
1402
1216
} else {
1403
if(debug){
1404
fprintf_plus(stderr, "Check current_server if we should run"
1405
" it, or wait\n");
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1406
1220
}
1407
1221
/* the current time */
1408
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1413
1227
/* Calculating in ms how long time between now and server
1414
1228
who we visted longest time ago. Now - last seen. */
1415
1229
waited_time.tv_sec = (now.tv_sec
1416
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1417
1231
waited_time.tv_nsec = (now.tv_nsec
1418
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1419
1233
/* total time is 10s/10,000ms.
1420
1234
Converting to s from ms by dividing by 1,000,
1421
1235
and ns to ms by dividing by 1,000,000. */
1422
1236
block_time = ((retry_interval
1423
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1424
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1425
1426
if(debug){
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1428
block_time);
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1429
1242
}
1430
1243
1431
1244
if(block_time <= 0){
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1436
1249
if(ret == 0){
1437
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1438
1251
return 0;
1439
1252
}
1440
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1441
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1442
1255
if(ret == -1){
1443
1256
perror_plus("clock_gettime");
1444
1257
return -1;
1445
1258
}
1446
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1447
1260
block_time = 0; /* Call avahi to find new Mandos
1448
1261
servers, but don't block */
1449
1262
}
1451
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
1265
}
1453
1266
if(ret != 0){
1454
if(ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1455
1268
return (ret != 1) ? ret : 0;
1456
1269
}
1457
1270
}
1458
1271
}
1459
1272
}
1460
1273
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1538
const float delay){
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1550
if(debug){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1553
}
1554
} else {
1555
perror_plus("open");
1556
}
1557
return;
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1583
if(numhooks == -1){
1584
perror_plus("scandir");
1585
return;
1586
}
1587
struct dirent *direntry;
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1592
if(debug){
1593
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1594
direntry->d_name);
1595
}
1596
pid_t hook_pid = fork();
1597
if(hook_pid == 0){
1598
/* Child */
1599
/* Raise privileges */
1600
if(raise_privileges_permanently() != 0){
1601
perror_plus("Failed to raise privileges");
1602
_exit(EX_NOPERM);
1603
}
1604
/* Set group */
1605
errno = 0;
1606
ret = setgid(0);
1607
if(ret == -1){
1608
perror_plus("setgid");
1609
_exit(EX_NOPERM);
1610
}
1611
/* Reset supplementary groups */
1612
errno = 0;
1613
ret = setgroups(0, NULL);
1614
if(ret == -1){
1615
perror_plus("setgroups");
1616
_exit(EX_NOPERM);
1617
}
1618
ret = dup2(devnull, STDIN_FILENO);
1619
if(ret == -1){
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1621
_exit(EX_OSERR);
1622
}
1623
ret = close(devnull);
1624
if(ret == -1){
1625
perror_plus("close");
1626
_exit(EX_OSERR);
1627
}
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1629
if(ret == -1){
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1631
_exit(EX_OSERR);
1632
}
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1634
if(ret == -1){
1635
perror_plus("setenv");
1636
_exit(EX_OSERR);
1637
}
1638
ret = setenv("DEVICE", interface, 1);
1639
if(ret == -1){
1640
perror_plus("setenv");
1641
_exit(EX_OSERR);
1642
}
1643
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1644
if(ret == -1){
1645
perror_plus("setenv");
1646
_exit(EX_OSERR);
1647
}
1648
ret = setenv("MODE", mode, 1);
1649
if(ret == -1){
1650
perror_plus("setenv");
1651
_exit(EX_OSERR);
1652
}
1653
char *delaystring;
1654
ret = asprintf(&delaystring, "%f", (double)delay);
1655
if(ret == -1){
1656
perror_plus("asprintf");
1657
_exit(EX_OSERR);
1658
}
1659
ret = setenv("DELAY", delaystring, 1);
1660
if(ret == -1){
1661
free(delaystring);
1662
perror_plus("setenv");
1663
_exit(EX_OSERR);
1664
}
1665
free(delaystring);
1666
if(connect_to != NULL){
1667
ret = setenv("CONNECT", connect_to, 1);
1668
if(ret == -1){
1669
perror_plus("setenv");
1670
_exit(EX_OSERR);
1671
}
1672
}
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
1675
perror_plus("fexecve");
1676
_exit(EXIT_FAILURE);
1677
}
1678
} else {
1679
int status;
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1681
perror_plus("waitpid");
1682
continue;
1683
}
1684
if(WIFEXITED(status)){
1685
if(WEXITSTATUS(status) != 0){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1687
" with status %d\n", direntry->d_name,
1688
WEXITSTATUS(status));
1689
continue;
1690
}
1691
} else if(WIFSIGNALED(status)){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1693
" signal %d\n", direntry->d_name,
1694
WTERMSIG(status));
1695
continue;
1696
} else {
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
1698
" crashed\n", direntry->d_name);
1699
continue;
1700
}
1701
}
1702
if(debug){
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1704
direntry->d_name);
1705
}
1706
}
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1708
perror_plus("close");
1709
} else {
1710
hookdir_fd = -1;
1711
}
1712
close(devnull);
1713
}
1714
1715
__attribute__((nonnull, warn_unused_result))
1716
error_t bring_up_interface(const char *const interface,
1717
const float delay){
1718
error_t old_errno = errno;
1719
int ret;
1720
struct ifreq network;
1721
unsigned int if_index = if_nametoindex(interface);
1722
if(if_index == 0){
1723
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1724
errno = old_errno;
1725
return ENXIO;
1726
}
1727
1728
if(quit_now){
1729
errno = old_errno;
1730
return EINTR;
1731
}
1732
1733
if(not interface_is_up(interface)){
1734
error_t ret_errno = 0, ioctl_errno = 0;
1735
if(not get_flags(interface, &network)){
1736
ret_errno = errno;
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
errno = old_errno;
1740
return ret_errno;
1741
}
1742
network.ifr_flags |= IFF_UP; /* set flag */
1743
1744
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1745
if(sd == -1){
1746
ret_errno = errno;
1747
perror_plus("socket");
1748
errno = old_errno;
1749
return ret_errno;
1750
}
1751
1752
if(quit_now){
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1754
if(ret == -1){
1755
perror_plus("close");
1756
}
1757
errno = old_errno;
1758
return EINTR;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise privileges */
1767
ret_errno = raise_privileges();
1768
if(ret_errno != 0){
1769
perror_plus("Failed to raise privileges");
1770
}
1771
1772
#ifdef __linux__
1773
int ret_linux;
1774
bool restore_loglevel = false;
1775
if(ret_errno == 0){
1776
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1777
messages about the network interface to mess up the prompt */
1778
ret_linux = klogctl(8, NULL, 5);
1779
if(ret_linux == -1){
1780
perror_plus("klogctl");
1781
} else {
1782
restore_loglevel = true;
1783
}
1784
}
1785
#endif /* __linux__ */
1786
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1787
ioctl_errno = errno;
1788
#ifdef __linux__
1789
if(restore_loglevel){
1790
ret_linux = klogctl(7, NULL, 0);
1791
if(ret_linux == -1){
1792
perror_plus("klogctl");
1793
}
1794
}
1795
#endif /* __linux__ */
1796
1797
/* If raise_privileges() succeeded above */
1798
if(ret_errno == 0){
1799
/* Lower privileges */
1800
ret_errno = lower_privileges();
1801
if(ret_errno != 0){
1802
errno = ret_errno;
1803
perror_plus("Failed to lower privileges");
1804
}
1805
}
1806
1807
/* Close the socket */
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1809
if(ret == -1){
1810
perror_plus("close");
1811
}
1812
1813
if(ret_setflags == -1){
1814
errno = ioctl_errno;
1815
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1816
errno = old_errno;
1817
return ioctl_errno;
1818
}
1819
} else if(debug){
1820
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1821
interface);
1822
}
1823
1824
/* Sleep checking until interface is running.
1825
Check every 0.25s, up to total time of delay */
1826
for(int i=0; i < delay * 4; i++){
1827
if(interface_is_running(interface)){
1828
break;
1829
}
1830
struct timespec sleeptime = { .tv_nsec = 250000000 };
1831
ret = nanosleep(&sleeptime, NULL);
1832
if(ret == -1 and errno != EINTR){
1833
perror_plus("nanosleep");
1834
}
1835
}
1836
1837
errno = old_errno;
1838
return 0;
1839
}
1840
1841
__attribute__((nonnull, warn_unused_result))
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
1844
struct ifreq network;
1845
unsigned int if_index = if_nametoindex(interface);
1846
if(if_index == 0){
1847
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1848
errno = old_errno;
1849
return ENXIO;
1850
}
1851
if(interface_is_up(interface)){
1852
error_t ret_errno = 0, ioctl_errno = 0;
1853
if(not get_flags(interface, &network) and debug){
1854
ret_errno = errno;
1855
fprintf_plus(stderr, "Failed to get flags for interface "
1856
"\"%s\"\n", interface);
1857
errno = old_errno;
1858
return ret_errno;
1859
}
1860
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1861
1862
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1863
if(sd == -1){
1864
ret_errno = errno;
1865
perror_plus("socket");
1866
errno = old_errno;
1867
return ret_errno;
1868
}
1869
1870
if(debug){
1871
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1872
interface);
1873
}
1874
1875
/* Raise privileges */
1876
ret_errno = raise_privileges();
1877
if(ret_errno != 0){
1878
perror_plus("Failed to raise privileges");
1879
}
1880
1881
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1882
ioctl_errno = errno;
1883
1884
/* If raise_privileges() succeeded above */
1885
if(ret_errno == 0){
1886
/* Lower privileges */
1887
ret_errno = lower_privileges();
1888
if(ret_errno != 0){
1889
errno = ret_errno;
1890
perror_plus("Failed to lower privileges");
1891
}
1892
}
1893
1894
/* Close the socket */
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1896
if(ret == -1){
1897
perror_plus("close");
1898
}
1899
1900
if(ret_setflags == -1){
1901
errno = ioctl_errno;
1902
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1903
errno = old_errno;
1904
return ioctl_errno;
1905
}
1906
} else if(debug){
1907
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1908
interface);
1909
}
1910
1911
errno = old_errno;
1912
return 0;
1913
}
1914
1915
1274
int main(int argc, char *argv[]){
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
1920
1275
AvahiSServiceBrowser *sb = NULL;
1921
error_t ret_errno;
1276
int error;
1922
1277
int ret;
1923
1278
intmax_t tmpmax;
1924
1279
char *tmp;
1925
1280
int exitcode = EXIT_SUCCESS;
1926
char *interfaces_to_take_down = NULL;
1927
size_t interfaces_to_take_down_size = 0;
1928
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1929
char old_tempdir[] = "/tmp/mandosXXXXXX";
1930
char *tempdir = NULL;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
1931
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1932
1290
const char *seckey = PATHDIR "/" SECKEY;
1933
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1934
char *interfaces_hooks = NULL;
1935
1292
1936
1293
bool gnutls_initialized = false;
1937
1294
bool gpgme_initialized = false;
1999
1356
.group = 2 },
2000
1357
{ .name = "retry", .key = 132,
2001
1358
.arg = "SECONDS",
2002
.doc = "Retry interval used when denied by the Mandos server",
2003
.group = 2 },
2004
{ .name = "network-hook-dir", .key = 133,
2005
.arg = "DIR",
2006
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
2007
1360
.group = 2 },
2008
1361
/*
2009
1362
* These reproduce what we would get without ARGP_NO_HELP
2028
1381
connect_to = arg;
2029
1382
break;
2030
1383
case 'i': /* --interface */
2031
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2032
arg, (int)',');
2033
if(ret_errno != 0){
2034
argp_error(state, "%s", strerror(ret_errno));
2035
}
1384
interface = arg;
2036
1385
break;
2037
1386
case 's': /* --seckey */
2038
1387
seckey = arg;
2062
1411
errno = 0;
2063
1412
retry_interval = strtod(arg, &tmp);
2064
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
2065
or (retry_interval * 1000) > INT_MAX
2066
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
2067
1415
argp_error(state, "Bad retry interval");
2068
1416
}
2069
1417
break;
2070
case 133: /* --network-hook-dir */
2071
hookdir = arg;
2072
break;
2073
1418
/*
2074
1419
* These reproduce what we would get without ARGP_NO_HELP
2075
1420
*/
2081
1426
argp_state_help(state, state->out_stream,
2082
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2083
1428
case 'V': /* --version */
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
2085
1430
exit(argp_err_exit_status);
2086
1431
break;
2087
1432
default:
2114
1459
{
2115
1460
/* Work around Debian bug #633582:
2116
1461
<http://bugs.debian.org/633582> */
2117
2118
/* Re-raise privileges */
2119
ret_errno = raise_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to raise privileges");
2123
} else {
2124
struct stat st;
2125
2126
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2127
int seckey_fd = open(seckey, O_RDONLY);
2128
if(seckey_fd == -1){
2129
perror_plus("open");
2130
} else {
2131
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2132
if(ret == -1){
2133
perror_plus("fstat");
2134
} else {
2135
if(S_ISREG(st.st_mode)
2136
and st.st_uid == 0 and st.st_gid == 0){
2137
ret = fchown(seckey_fd, uid, gid);
2138
if(ret == -1){
2139
perror_plus("fchown");
2140
}
2141
}
2142
}
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2144
}
2145
}
2146
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2149
if(pubkey_fd == -1){
2150
perror_plus("open");
2151
} else {
2152
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2153
if(ret == -1){
2154
perror_plus("fstat");
2155
} else {
2156
if(S_ISREG(st.st_mode)
2157
and st.st_uid == 0 and st.st_gid == 0){
2158
ret = fchown(pubkey_fd, uid, gid);
2159
if(ret == -1){
2160
perror_plus("fchown");
2161
}
2162
}
2163
}
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2165
}
2166
}
2167
2168
/* Lower privileges */
2169
ret_errno = lower_privileges();
2170
if(ret_errno != 0){
2171
errno = ret_errno;
2172
perror_plus("Failed to lower privileges");
2173
}
2174
}
2175
}
2176
2177
/* Remove invalid interface names (except "none") */
2178
{
2179
char *interface = NULL;
2180
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2181
interface))){
2182
if(strcmp(interface, "none") != 0
2183
and if_nametoindex(interface) == 0){
2184
if(interface[0] != '\0'){
2185
fprintf_plus(stderr, "Not using nonexisting interface"
2186
" \"%s\"\n", interface);
2187
}
2188
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2189
interface = NULL;
2190
}
2191
}
2192
}
2193
2194
/* Run network hooks */
2195
{
2196
if(mc.interfaces != NULL){
2197
interfaces_hooks = malloc(mc.interfaces_size);
2198
if(interfaces_hooks == NULL){
2199
perror_plus("malloc");
2200
goto end;
2201
}
2202
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2203
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2204
}
2205
run_network_hooks("start", interfaces_hooks != NULL ?
2206
interfaces_hooks : "", delay);
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
2207
1513
}
2208
1514
2209
1515
if(not debug){
2210
1516
avahi_set_log_function(empty_log);
2211
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
2212
1543
2213
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2214
1545
from the signal handler */
2215
1546
/* Initialize the pseudo-RNG for Avahi */
2216
1547
srand((unsigned int) time(NULL));
2217
simple_poll = avahi_simple_poll_new();
2218
if(simple_poll == NULL){
2219
fprintf_plus(stderr,
2220
"Avahi: Failed to create simple poll object.\n");
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2221
1551
exitcode = EX_UNAVAILABLE;
2222
1552
goto end;
2223
1553
}
2285
1615
}
2286
1616
}
2287
1617
2288
/* If no interfaces were specified, make a list */
2289
if(mc.interfaces == NULL){
2290
struct dirent **direntries;
2291
/* Look for any good interfaces */
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2293
alphasort);
2294
if(ret >= 1){
2295
/* Add all found interfaces to interfaces list */
2296
for(int i = 0; i < ret; ++i){
2297
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2298
direntries[i]->d_name);
2299
if(ret_errno != 0){
2300
errno = ret_errno;
2301
perror_plus("argz_add");
2302
continue;
2303
}
2304
if(debug){
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2306
direntries[i]->d_name);
2307
}
2308
}
2309
free(direntries);
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
break;
1723
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
2310
1754
} else {
2311
free(direntries);
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2313
exitcode = EXIT_FAILURE;
2314
goto end;
2315
}
2316
}
2317
2318
/* Bring up interfaces which are down, and remove any "none"s */
2319
{
2320
char *interface = NULL;
2321
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2322
interface))){
2323
/* If interface name is "none", stop bringing up interfaces.
2324
Also remove all instances of "none" from the list */
2325
if(strcmp(interface, "none") == 0){
2326
argz_delete(&mc.interfaces, &mc.interfaces_size,
2327
interface);
2328
interface = NULL;
2329
while((interface = argz_next(mc.interfaces,
2330
mc.interfaces_size, interface))){
2331
if(strcmp(interface, "none") == 0){
2332
argz_delete(&mc.interfaces, &mc.interfaces_size,
2333
interface);
2334
interface = NULL;
2335
}
2336
}
2337
break;
2338
}
2339
bool interface_was_up = interface_is_up(interface);
2340
errno = bring_up_interface(interface, delay);
2341
if(not interface_was_up){
2342
if(errno != 0){
2343
perror_plus("Failed to bring up interface");
2344
} else {
2345
errno = argz_add(&interfaces_to_take_down,
2346
&interfaces_to_take_down_size,
2347
interface);
2348
if(errno != 0){
2349
perror_plus("argz_add");
2350
}
2351
}
2352
}
2353
}
2354
if(debug and (interfaces_to_take_down == NULL)){
2355
fprintf_plus(stderr, "No interfaces were brought up\n");
2356
}
2357
}
2358
2359
/* If we only got one interface, explicitly use only that one */
2360
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2361
if(debug){
2362
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2363
mc.interfaces);
2364
}
2365
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2366
1761
}
2367
1762
2368
1763
if(quit_now){
2369
1764
goto end;
2370
1765
}
2371
1766
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2373
1768
if(ret == -1){
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2375
1770
exitcode = EX_UNAVAILABLE;
2376
1771
goto end;
2377
1772
} else {
2382
1777
goto end;
2383
1778
}
2384
1779
2385
/* Try /run/tmp before /tmp */
2386
tempdir = mkdtemp(run_tempdir);
2387
if(tempdir == NULL and errno == ENOENT){
2388
if(debug){
2389
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2390
run_tempdir, old_tempdir);
2391
}
2392
tempdir = mkdtemp(old_tempdir);
2393
}
2394
if(tempdir == NULL){
1780
if(mkdtemp(tempdir) == NULL){
2395
1781
perror_plus("mkdtemp");
2396
1782
goto end;
2397
1783
}
1784
tempdir_created = true;
2398
1785
2399
1786
if(quit_now){
2400
1787
goto end;
2401
1788
}
2402
1789
2403
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2404
fprintf_plus(stderr, "init_gpgme failed\n");
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2405
1792
exitcode = EX_UNAVAILABLE;
2406
1793
goto end;
2407
1794
} else {
2416
1803
/* Connect directly, do not use Zeroconf */
2417
1804
/* (Mainly meant for debugging) */
2418
1805
char *address = strrchr(connect_to, ':');
2419
2420
1806
if(address == NULL){
2421
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2422
1808
exitcode = EX_USAGE;
2423
1809
goto end;
2424
1810
}
2427
1813
goto end;
2428
1814
}
2429
1815
2430
in_port_t port;
1816
uint16_t port;
2431
1817
errno = 0;
2432
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2433
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2434
or tmpmax != (in_port_t)tmpmax){
2435
fprintf_plus(stderr, "Bad port number\n");
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2436
1822
exitcode = EX_USAGE;
2437
1823
goto end;
2438
1824
}
2439
1825
2440
1826
if(quit_now){
2441
1827
goto end;
2442
1828
}
2443
1829
2444
port = (in_port_t)tmpmax;
1830
port = (uint16_t)tmpmax;
2445
1831
*address = '\0';
1832
address = connect_to;
2446
1833
/* Colon in address indicates IPv6 */
2447
1834
int af;
2448
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2449
1836
af = AF_INET6;
2450
/* Accept [] around IPv6 address - see RFC 5952 */
2451
if(connect_to[0] == '[' and address[-1] == ']')
2452
{
2453
connect_to++;
2454
address[-1] = '\0';
2455
}
2456
1837
} else {
2457
1838
af = AF_INET;
2458
1839
}
2459
address = connect_to;
2460
1840
2461
1841
if(quit_now){
2462
1842
goto end;
2463
1843
}
2464
1844
2465
1845
while(not quit_now){
2466
ret = start_mandos_communication(address, port, if_index, af,
2467
&mc);
1846
ret = start_mandos_communication(address, port, if_index, af);
2468
1847
if(quit_now or ret == 0){
2469
1848
break;
2470
1849
}
2471
if(debug){
2472
fprintf_plus(stderr, "Retrying in %d seconds\n",
2473
(int)retry_interval);
2474
}
2475
sleep((unsigned int)retry_interval);
2476
}
2477
2478
if(not quit_now){
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
2479
1854
exitcode = EXIT_SUCCESS;
2480
1855
}
2481
1856
2482
1857
goto end;
2483
1858
}
2484
1859
2496
1871
config.publish_domain = 0;
2497
1872
2498
1873
/* Allocate a new server */
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2500
&config, NULL, NULL, &ret_errno);
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2501
1877
2502
1878
/* Free the Avahi configuration data */
2503
1879
avahi_server_config_free(&config);
2505
1881
2506
1882
/* Check if creating the Avahi server object succeeded */
2507
1883
if(mc.server == NULL){
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2509
avahi_strerror(ret_errno));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2510
1886
exitcode = EX_UNAVAILABLE;
2511
1887
goto end;
2512
1888
}
2518
1894
/* Create the Avahi service browser */
2519
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
2520
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2521
NULL, 0, browse_callback,
2522
(void *)&mc);
1897
NULL, 0, browse_callback, NULL);
2523
1898
if(sb == NULL){
2524
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2525
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2526
1901
exitcode = EX_UNAVAILABLE;
2527
1902
goto end;
2528
1903
}
2534
1909
/* Run the main loop */
2535
1910
2536
1911
if(debug){
2537
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2538
1913
}
2539
2540
ret = avahi_loop_with_timeout(simple_poll,
2541
(int)(retry_interval * 1000), &mc);
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2542
1917
if(debug){
2543
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2544
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2545
1920
}
2546
1921
2547
1922
end:
2548
1923
2549
1924
if(debug){
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2551
1926
}
2552
1927
2553
1928
/* Cleanup things */
2554
free(mc.interfaces);
2555
2556
1929
if(sb != NULL)
2557
1930
avahi_s_service_browser_free(sb);
2558
1931
2559
1932
if(mc.server != NULL)
2560
1933
avahi_server_free(mc.server);
2561
1934
2562
if(simple_poll != NULL)
2563
avahi_simple_poll_free(simple_poll);
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2564
1937
2565
1938
if(gnutls_initialized){
2566
1939
gnutls_certificate_free_credentials(mc.cred);
2571
1944
if(gpgme_initialized){
2572
1945
gpgme_release(mc.ctx);
2573
1946
}
2574
1947
2575
1948
/* Cleans up the circular linked list of Mandos servers the client
2576
1949
has seen */
2577
1950
if(mc.current_server != NULL){
2583
1956
}
2584
1957
}
2585
1958
2586
/* Re-raise privileges */
2587
{
2588
ret_errno = raise_privileges();
2589
if(ret_errno != 0){
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
2614
1966
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
perror_plus("Failed to lower privileges permanently");
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
2619
1988
}
2620
1989
}
2621
1990
2622
free(interfaces_to_take_down);
2623
free(interfaces_hooks);
2624
2625
1991
/* Removes the GPGME temp directory and all files inside */
2626
if(tempdir != NULL){
1992
if(tempdir_created){
2627
1993
struct dirent **direntries = NULL;
2628
1994
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2630
alphasort);
2631
if(numentries > 0){
2632
for(int i = 0; i < numentries; i++){
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2633
1998
direntry = direntries[i];
2634
1999
char *fullname = NULL;
2635
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2640
2005
}
2641
2006
ret = remove(fullname);
2642
2007
if(ret == -1){
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2644
strerror(errno));
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2645
2010
}
2646
2011
free(fullname);
2647
2012
}
2648
2013
}
2649
2650
/* need to clean even if 0 because man page doesn't specify */
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2651
2017
free(direntries);
2652
if(numentries == -1){
2018
if (ret == -1){
2653
2019
perror_plus("scandir");
2654
2020
}
2655
2021
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0